michael@0: // This is CodeMirror (http://codemirror.net), a code editor
michael@0: // implemented in JavaScript on top of the browser's DOM.
michael@0: //
michael@0: // You can find some technical background for some of the code below
michael@0: // at http://marijnhaverbeke.nl/blog/#cm-internals .
michael@0: 
michael@0: (function(mod) {
michael@0:   if (typeof exports == "object" && typeof module == "object") // CommonJS
michael@0:     module.exports = mod();
michael@0:   else if (typeof define == "function" && define.amd) // AMD
michael@0:     return define([], mod);
michael@0:   else // Plain browser env
michael@0:     this.CodeMirror = mod();
michael@0: })(function() {
michael@0:   "use strict";
michael@0: 
michael@0:   // BROWSER SNIFFING
michael@0: 
michael@0:   // Kludges for bugs and behavior differences that can't be feature
michael@0:   // detected are enabled based on userAgent etc sniffing.
michael@0: 
michael@0:   var gecko = /gecko\/\d/i.test(navigator.userAgent);
michael@0:   // ie_uptoN means Internet Explorer version N or lower
michael@0:   var ie_upto10 = /MSIE \d/.test(navigator.userAgent);
michael@0:   var ie_upto7 = ie_upto10 && (document.documentMode == null || document.documentMode < 8);
michael@0:   var ie_upto8 = ie_upto10 && (document.documentMode == null || document.documentMode < 9);
michael@0:   var ie_upto9 = ie_upto10 && (document.documentMode == null || document.documentMode < 10);
michael@0:   var ie_11up = /Trident\/([7-9]|\d{2,})\./.test(navigator.userAgent);
michael@0:   var ie = ie_upto10 || ie_11up;
michael@0:   var webkit = /WebKit\//.test(navigator.userAgent);
michael@0:   var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(navigator.userAgent);
michael@0:   var chrome = /Chrome\//.test(navigator.userAgent);
michael@0:   var presto = /Opera\//.test(navigator.userAgent);
michael@0:   var safari = /Apple Computer/.test(navigator.vendor);
michael@0:   var khtml = /KHTML\//.test(navigator.userAgent);
michael@0:   var mac_geLion = /Mac OS X 1\d\D([7-9]|\d\d)\D/.test(navigator.userAgent);
michael@0:   var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(navigator.userAgent);
michael@0:   var phantom = /PhantomJS/.test(navigator.userAgent);
michael@0: 
michael@0:   var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
michael@0:   // This is woefully incomplete. Suggestions for alternative methods welcome.
michael@0:   var mobile = ios || /Android|webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(navigator.userAgent);
michael@0:   var mac = ios || /Mac/.test(navigator.platform);
michael@0:   var windows = /win/i.test(navigator.platform);
michael@0: 
michael@0:   var presto_version = presto && navigator.userAgent.match(/Version\/(\d*\.\d*)/);
michael@0:   if (presto_version) presto_version = Number(presto_version[1]);
michael@0:   if (presto_version && presto_version >= 15) { presto = false; webkit = true; }
michael@0:   // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
michael@0:   var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));
michael@0:   var captureRightClick = gecko || (ie && !ie_upto8);
michael@0: 
michael@0:   // Optimize some code when these features are not used.
michael@0:   var sawReadOnlySpans = false, sawCollapsedSpans = false;
michael@0: 
michael@0:   // EDITOR CONSTRUCTOR
michael@0: 
michael@0:   // A CodeMirror instance represents an editor. This is the object
michael@0:   // that user code is usually dealing with.
michael@0: 
michael@0:   function CodeMirror(place, options) {
michael@0:     if (!(this instanceof CodeMirror)) return new CodeMirror(place, options);
michael@0: 
michael@0:     this.options = options = options || {};
michael@0:     // Determine effective options based on given values and defaults.
michael@0:     for (var opt in defaults) if (!options.hasOwnProperty(opt))
michael@0:       options[opt] = defaults[opt];
michael@0:     setGuttersForLineNumbers(options);
michael@0: 
michael@0:     var doc = options.value;
michael@0:     if (typeof doc == "string") doc = new Doc(doc, options.mode);
michael@0:     this.doc = doc;
michael@0: 
michael@0:     var display = this.display = new Display(place, doc);
michael@0:     display.wrapper.CodeMirror = this;
michael@0:     updateGutters(this);
michael@0:     themeChanged(this);
michael@0:     if (options.lineWrapping)
michael@0:       this.display.wrapper.className += " CodeMirror-wrap";
michael@0:     if (options.autofocus && !mobile) focusInput(this);
michael@0: 
michael@0:     this.state = {
michael@0:       keyMaps: [],  // stores maps added by addKeyMap
michael@0:       overlays: [], // highlighting overlays, as added by addOverlay
michael@0:       modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info
michael@0:       overwrite: false, focused: false,
michael@0:       suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
michael@0:       pasteIncoming: false, cutIncoming: false, // help recognize paste/cut edits in readInput
michael@0:       draggingText: false,
michael@0:       highlight: new Delayed() // stores highlight worker timeout
michael@0:     };
michael@0: 
michael@0:     // Override magic textarea content restore that IE sometimes does
michael@0:     // on our hidden textarea on reload
michael@0:     if (ie_upto10) setTimeout(bind(resetInput, this, true), 20);
michael@0: 
michael@0:     registerEventHandlers(this);
michael@0: 
michael@0:     var cm = this;
michael@0:     runInOp(this, function() {
michael@0:       cm.curOp.forceUpdate = true;
michael@0:       attachDoc(cm, doc);
michael@0: 
michael@0:       if ((options.autofocus && !mobile) || activeElt() == display.input)
michael@0:         setTimeout(bind(onFocus, cm), 20);
michael@0:       else
michael@0:         onBlur(cm);
michael@0: 
michael@0:       for (var opt in optionHandlers) if (optionHandlers.hasOwnProperty(opt))
michael@0:         optionHandlers[opt](cm, options[opt], Init);
michael@0:       for (var i = 0; i < initHooks.length; ++i) initHooks[i](cm);
michael@0:     });
michael@0:   }
michael@0: 
michael@0:   // DISPLAY CONSTRUCTOR
michael@0: 
michael@0:   // The display handles the DOM integration, both for input reading
michael@0:   // and content drawing. It holds references to DOM nodes and
michael@0:   // display-related state.
michael@0: 
michael@0:   function Display(place, doc) {
michael@0:     var d = this;
michael@0: 
michael@0:     // The semihidden textarea that is focused when the editor is
michael@0:     // focused, and receives input.
michael@0:     var input = d.input = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em; outline: none");
michael@0:     // The textarea is kept positioned near the cursor to prevent the
michael@0:     // fact that it'll be scrolled into view on input from scrolling
michael@0:     // our fake cursor out of view. On webkit, when wrap=off, paste is
michael@0:     // very slow. So make the area wide instead.
michael@0:     if (webkit) input.style.width = "1000px";
michael@0:     else input.setAttribute("wrap", "off");
michael@0:     // If border: 0; -- iOS fails to open keyboard (issue #1287)
michael@0:     if (ios) input.style.border = "1px solid black";
michael@0:     input.setAttribute("autocorrect", "off"); input.setAttribute("autocapitalize", "off"); input.setAttribute("spellcheck", "false");
michael@0: 
michael@0:     // Wraps and hides input textarea
michael@0:     d.inputDiv = elt("div", [input], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
michael@0:     // The fake scrollbar elements.
michael@0:     d.scrollbarH = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar");
michael@0:     d.scrollbarV = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar");
michael@0:     // Covers bottom-right square when both scrollbars are present.
michael@0:     d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
michael@0:     // Covers bottom of gutter when coverGutterNextToScrollbar is on
michael@0:     // and h scrollbar is present.
michael@0:     d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
michael@0:     // Will contain the actual code, positioned to cover the viewport.
michael@0:     d.lineDiv = elt("div", null, "CodeMirror-code");
michael@0:     // Elements are added to these to represent selection and cursors.
michael@0:     d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
michael@0:     d.cursorDiv = elt("div", null, "CodeMirror-cursors");
michael@0:     // A visibility: hidden element used to find the size of things.
michael@0:     d.measure = elt("div", null, "CodeMirror-measure");
michael@0:     // When lines outside of the viewport are measured, they are drawn in this.
michael@0:     d.lineMeasure = elt("div", null, "CodeMirror-measure");
michael@0:     // Wraps everything that needs to exist inside the vertically-padded coordinate system
michael@0:     d.lineSpace = elt("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
michael@0:                       null, "position: relative; outline: none");
michael@0:     // Moved around its parent to cover visible view.
michael@0:     d.mover = elt("div", [elt("div", [d.lineSpace], "CodeMirror-lines")], null, "position: relative");
michael@0:     // Set to the height of the document, allowing scrolling.
michael@0:     d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
michael@0:     // Behavior of elts with overflow: auto and padding is
michael@0:     // inconsistent across browsers. This is used to ensure the
michael@0:     // scrollable area is big enough.
michael@0:     d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerCutOff + "px; width: 1px;");
michael@0:     // Will contain the gutters, if any.
michael@0:     d.gutters = elt("div", null, "CodeMirror-gutters");
michael@0:     d.lineGutter = null;
michael@0:     // Actual scrollable element.
michael@0:     d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");
michael@0:     d.scroller.setAttribute("tabIndex", "-1");
michael@0:     // The element in which the editor lives.
michael@0:     d.wrapper = elt("div", [d.inputDiv, d.scrollbarH, d.scrollbarV,
michael@0:                             d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");
michael@0: 
michael@0:     // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
michael@0:     if (ie_upto7) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }
michael@0:     // Needed to hide big blue blinking cursor on Mobile Safari
michael@0:     if (ios) input.style.width = "0px";
michael@0:     if (!webkit) d.scroller.draggable = true;
michael@0:     // Needed to handle Tab key in KHTML
michael@0:     if (khtml) { d.inputDiv.style.height = "1px"; d.inputDiv.style.position = "absolute"; }
michael@0:     // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
michael@0:     if (ie_upto7) d.scrollbarH.style.minHeight = d.scrollbarV.style.minWidth = "18px";
michael@0: 
michael@0:     if (place.appendChild) place.appendChild(d.wrapper);
michael@0:     else place(d.wrapper);
michael@0: 
michael@0:     // Current rendered range (may be bigger than the view window).
michael@0:     d.viewFrom = d.viewTo = doc.first;
michael@0:     // Information about the rendered lines.
michael@0:     d.view = [];
michael@0:     // Holds info about a single rendered line when it was rendered
michael@0:     // for measurement, while not in view.
michael@0:     d.externalMeasured = null;
michael@0:     // Empty space (in pixels) above the view
michael@0:     d.viewOffset = 0;
michael@0:     d.lastSizeC = 0;
michael@0:     d.updateLineNumbers = null;
michael@0: 
michael@0:     // Used to only resize the line number gutter when necessary (when
michael@0:     // the amount of lines crosses a boundary that makes its width change)
michael@0:     d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
michael@0:     // See readInput and resetInput
michael@0:     d.prevInput = "";
michael@0:     // Set to true when a non-horizontal-scrolling line widget is
michael@0:     // added. As an optimization, line widget aligning is skipped when
michael@0:     // this is false.
michael@0:     d.alignWidgets = false;
michael@0:     // Flag that indicates whether we expect input to appear real soon
michael@0:     // now (after some event like 'keypress' or 'input') and are
michael@0:     // polling intensively.
michael@0:     d.pollingFast = false;
michael@0:     // Self-resetting timeout for the poller
michael@0:     d.poll = new Delayed();
michael@0: 
michael@0:     d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
michael@0: 
michael@0:     // Tracks when resetInput has punted to just putting a short
michael@0:     // string into the textarea instead of the full selection.
michael@0:     d.inaccurateSelection = false;
michael@0: 
michael@0:     // Tracks the maximum line length so that the horizontal scrollbar
michael@0:     // can be kept static when scrolling.
michael@0:     d.maxLine = null;
michael@0:     d.maxLineLength = 0;
michael@0:     d.maxLineChanged = false;
michael@0: 
michael@0:     // Used for measuring wheel scrolling granularity
michael@0:     d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;
michael@0: 
michael@0:     // True when shift is held down.
michael@0:     d.shift = false;
michael@0:   }
michael@0: 
michael@0:   // STATE UPDATES
michael@0: 
michael@0:   // Used to get the editor into a consistent state again when options change.
michael@0: 
michael@0:   function loadMode(cm) {
michael@0:     cm.doc.mode = CodeMirror.getMode(cm.options, cm.doc.modeOption);
michael@0:     resetModeState(cm);
michael@0:   }
michael@0: 
michael@0:   function resetModeState(cm) {
michael@0:     cm.doc.iter(function(line) {
michael@0:       if (line.stateAfter) line.stateAfter = null;
michael@0:       if (line.styles) line.styles = null;
michael@0:     });
michael@0:     cm.doc.frontier = cm.doc.first;
michael@0:     startWorker(cm, 100);
michael@0:     cm.state.modeGen++;
michael@0:     if (cm.curOp) regChange(cm);
michael@0:   }
michael@0: 
michael@0:   function wrappingChanged(cm) {
michael@0:     if (cm.options.lineWrapping) {
michael@0:       cm.display.wrapper.className += " CodeMirror-wrap";
michael@0:       cm.display.sizer.style.minWidth = "";
michael@0:     } else {
michael@0:       cm.display.wrapper.className = cm.display.wrapper.className.replace(" CodeMirror-wrap", "");
michael@0:       findMaxLine(cm);
michael@0:     }
michael@0:     estimateLineHeights(cm);
michael@0:     regChange(cm);
michael@0:     clearCaches(cm);
michael@0:     setTimeout(function(){updateScrollbars(cm);}, 100);
michael@0:   }
michael@0: 
michael@0:   // Returns a function that estimates the height of a line, to use as
michael@0:   // first approximation until the line becomes visible (and is thus
michael@0:   // properly measurable).
michael@0:   function estimateHeight(cm) {
michael@0:     var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;
michael@0:     var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
michael@0:     return function(line) {
michael@0:       if (lineIsHidden(cm.doc, line)) return 0;
michael@0: 
michael@0:       var widgetsHeight = 0;
michael@0:       if (line.widgets) for (var i = 0; i < line.widgets.length; i++) {
michael@0:         if (line.widgets[i].height) widgetsHeight += line.widgets[i].height;
michael@0:       }
michael@0: 
michael@0:       if (wrapping)
michael@0:         return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th;
michael@0:       else
michael@0:         return widgetsHeight + th;
michael@0:     };
michael@0:   }
michael@0: 
michael@0:   function estimateLineHeights(cm) {
michael@0:     var doc = cm.doc, est = estimateHeight(cm);
michael@0:     doc.iter(function(line) {
michael@0:       var estHeight = est(line);
michael@0:       if (estHeight != line.height) updateLineHeight(line, estHeight);
michael@0:     });
michael@0:   }
michael@0: 
michael@0:   function keyMapChanged(cm) {
michael@0:     var map = keyMap[cm.options.keyMap], style = map.style;
michael@0:     cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-keymap-\S+/g, "") +
michael@0:       (style ? " cm-keymap-" + style : "");
michael@0:   }
michael@0: 
michael@0:   function themeChanged(cm) {
michael@0:     cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
michael@0:       cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
michael@0:     clearCaches(cm);
michael@0:   }
michael@0: 
michael@0:   function guttersChanged(cm) {
michael@0:     updateGutters(cm);
michael@0:     regChange(cm);
michael@0:     setTimeout(function(){alignHorizontally(cm);}, 20);
michael@0:   }
michael@0: 
michael@0:   // Rebuild the gutter elements, ensure the margin to the left of the
michael@0:   // code matches their width.
michael@0:   function updateGutters(cm) {
michael@0:     var gutters = cm.display.gutters, specs = cm.options.gutters;
michael@0:     removeChildren(gutters);
michael@0:     for (var i = 0; i < specs.length; ++i) {
michael@0:       var gutterClass = specs[i];
michael@0:       var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass));
michael@0:       if (gutterClass == "CodeMirror-linenumbers") {
michael@0:         cm.display.lineGutter = gElt;
michael@0:         gElt.style.width = (cm.display.lineNumWidth || 1) + "px";
michael@0:       }
michael@0:     }
michael@0:     gutters.style.display = i ? "" : "none";
michael@0:     var width = gutters.offsetWidth;
michael@0:     cm.display.sizer.style.marginLeft = width + "px";
michael@0:     if (i) cm.display.scrollbarH.style.left = cm.options.fixedGutter ? width + "px" : 0;
michael@0:   }
michael@0: 
michael@0:   // Compute the character length of a line, taking into account
michael@0:   // collapsed ranges (see markText) that might hide parts, and join
michael@0:   // other lines onto it.
michael@0:   function lineLength(line) {
michael@0:     if (line.height == 0) return 0;
michael@0:     var len = line.text.length, merged, cur = line;
michael@0:     while (merged = collapsedSpanAtStart(cur)) {
michael@0:       var found = merged.find(0, true);
michael@0:       cur = found.from.line;
michael@0:       len += found.from.ch - found.to.ch;
michael@0:     }
michael@0:     cur = line;
michael@0:     while (merged = collapsedSpanAtEnd(cur)) {
michael@0:       var found = merged.find(0, true);
michael@0:       len -= cur.text.length - found.from.ch;
michael@0:       cur = found.to.line;
michael@0:       len += cur.text.length - found.to.ch;
michael@0:     }
michael@0:     return len;
michael@0:   }
michael@0: 
michael@0:   // Find the longest line in the document.
michael@0:   function findMaxLine(cm) {
michael@0:     var d = cm.display, doc = cm.doc;
michael@0:     d.maxLine = getLine(doc, doc.first);
michael@0:     d.maxLineLength = lineLength(d.maxLine);
michael@0:     d.maxLineChanged = true;
michael@0:     doc.iter(function(line) {
michael@0:       var len = lineLength(line);
michael@0:       if (len > d.maxLineLength) {
michael@0:         d.maxLineLength = len;
michael@0:         d.maxLine = line;
michael@0:       }
michael@0:     });
michael@0:   }
michael@0: 
michael@0:   // Make sure the gutters options contains the element
michael@0:   // "CodeMirror-linenumbers" when the lineNumbers option is true.
michael@0:   function setGuttersForLineNumbers(options) {
michael@0:     var found = indexOf(options.gutters, "CodeMirror-linenumbers");
michael@0:     if (found == -1 && options.lineNumbers) {
michael@0:       options.gutters = options.gutters.concat(["CodeMirror-linenumbers"]);
michael@0:     } else if (found > -1 && !options.lineNumbers) {
michael@0:       options.gutters = options.gutters.slice(0);
michael@0:       options.gutters.splice(found, 1);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // SCROLLBARS
michael@0: 
michael@0:   // Prepare DOM reads needed to update the scrollbars. Done in one
michael@0:   // shot to minimize update/measure roundtrips.
michael@0:   function measureForScrollbars(cm) {
michael@0:     var scroll = cm.display.scroller;
michael@0:     return {
michael@0:       clientHeight: scroll.clientHeight,
michael@0:       barHeight: cm.display.scrollbarV.clientHeight,
michael@0:       scrollWidth: scroll.scrollWidth, clientWidth: scroll.clientWidth,
michael@0:       barWidth: cm.display.scrollbarH.clientWidth,
michael@0:       docHeight: Math.round(cm.doc.height + paddingVert(cm.display))
michael@0:     };
michael@0:   }
michael@0: 
michael@0:   // Re-synchronize the fake scrollbars with the actual size of the
michael@0:   // content.
michael@0:   function updateScrollbars(cm, measure) {
michael@0:     if (!measure) measure = measureForScrollbars(cm);
michael@0:     var d = cm.display;
michael@0:     var scrollHeight = measure.docHeight + scrollerCutOff;
michael@0:     var needsH = measure.scrollWidth > measure.clientWidth;
michael@0:     var needsV = scrollHeight > measure.clientHeight;
michael@0:     if (needsV) {
michael@0:       d.scrollbarV.style.display = "block";
michael@0:       d.scrollbarV.style.bottom = needsH ? scrollbarWidth(d.measure) + "px" : "0";
michael@0:       // A bug in IE8 can cause this value to be negative, so guard it.
michael@0:       d.scrollbarV.firstChild.style.height =
michael@0:         Math.max(0, scrollHeight - measure.clientHeight + (measure.barHeight || d.scrollbarV.clientHeight)) + "px";
michael@0:     } else {
michael@0:       d.scrollbarV.style.display = "";
michael@0:       d.scrollbarV.firstChild.style.height = "0";
michael@0:     }
michael@0:     if (needsH) {
michael@0:       d.scrollbarH.style.display = "block";
michael@0:       d.scrollbarH.style.right = needsV ? scrollbarWidth(d.measure) + "px" : "0";
michael@0:       d.scrollbarH.firstChild.style.width =
michael@0:         (measure.scrollWidth - measure.clientWidth + (measure.barWidth || d.scrollbarH.clientWidth)) + "px";
michael@0:     } else {
michael@0:       d.scrollbarH.style.display = "";
michael@0:       d.scrollbarH.firstChild.style.width = "0";
michael@0:     }
michael@0:     if (needsH && needsV) {
michael@0:       d.scrollbarFiller.style.display = "block";
michael@0:       d.scrollbarFiller.style.height = d.scrollbarFiller.style.width = scrollbarWidth(d.measure) + "px";
michael@0:     } else d.scrollbarFiller.style.display = "";
michael@0:     if (needsH && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
michael@0:       d.gutterFiller.style.display = "block";
michael@0:       d.gutterFiller.style.height = scrollbarWidth(d.measure) + "px";
michael@0:       d.gutterFiller.style.width = d.gutters.offsetWidth + "px";
michael@0:     } else d.gutterFiller.style.display = "";
michael@0: 
michael@0:     if (mac_geLion && scrollbarWidth(d.measure) === 0) {
michael@0:       d.scrollbarV.style.minWidth = d.scrollbarH.style.minHeight = mac_geMountainLion ? "18px" : "12px";
michael@0:       var barMouseDown = function(e) {
michael@0:         if (e_target(e) != d.scrollbarV && e_target(e) != d.scrollbarH)
michael@0:           operation(cm, onMouseDown)(e);
michael@0:       };
michael@0:       on(d.scrollbarV, "mousedown", barMouseDown);
michael@0:       on(d.scrollbarH, "mousedown", barMouseDown);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Compute the lines that are visible in a given viewport (defaults
michael@0:   // the the current scroll position). viewPort may contain top,
michael@0:   // height, and ensure (see op.scrollToPos) properties.
michael@0:   function visibleLines(display, doc, viewPort) {
michael@0:     var top = viewPort && viewPort.top != null ? viewPort.top : display.scroller.scrollTop;
michael@0:     top = Math.floor(top - paddingTop(display));
michael@0:     var bottom = viewPort && viewPort.bottom != null ? viewPort.bottom : top + display.wrapper.clientHeight;
michael@0: 
michael@0:     var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom);
michael@0:     // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
michael@0:     // forces those lines into the viewport (if possible).
michael@0:     if (viewPort && viewPort.ensure) {
michael@0:       var ensureFrom = viewPort.ensure.from.line, ensureTo = viewPort.ensure.to.line;
michael@0:       if (ensureFrom < from)
michael@0:         return {from: ensureFrom,
michael@0:                 to: lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight)};
michael@0:       if (Math.min(ensureTo, doc.lastLine()) >= to)
michael@0:         return {from: lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight),
michael@0:                 to: ensureTo};
michael@0:     }
michael@0:     return {from: from, to: to};
michael@0:   }
michael@0: 
michael@0:   // LINE NUMBERS
michael@0: 
michael@0:   // Re-align line numbers and gutter marks to compensate for
michael@0:   // horizontal scrolling.
michael@0:   function alignHorizontally(cm) {
michael@0:     var display = cm.display, view = display.view;
michael@0:     if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) return;
michael@0:     var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
michael@0:     var gutterW = display.gutters.offsetWidth, left = comp + "px";
michael@0:     for (var i = 0; i < view.length; i++) if (!view[i].hidden) {
michael@0:       if (cm.options.fixedGutter && view[i].gutter)
michael@0:         view[i].gutter.style.left = left;
michael@0:       var align = view[i].alignable;
michael@0:       if (align) for (var j = 0; j < align.length; j++)
michael@0:         align[j].style.left = left;
michael@0:     }
michael@0:     if (cm.options.fixedGutter)
michael@0:       display.gutters.style.left = (comp + gutterW) + "px";
michael@0:   }
michael@0: 
michael@0:   // Used to ensure that the line number gutter is still the right
michael@0:   // size for the current document size. Returns true when an update
michael@0:   // is needed.
michael@0:   function maybeUpdateLineNumberWidth(cm) {
michael@0:     if (!cm.options.lineNumbers) return false;
michael@0:     var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;
michael@0:     if (last.length != display.lineNumChars) {
michael@0:       var test = display.measure.appendChild(elt("div", [elt("div", last)],
michael@0:                                                  "CodeMirror-linenumber CodeMirror-gutter-elt"));
michael@0:       var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;
michael@0:       display.lineGutter.style.width = "";
michael@0:       display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding);
michael@0:       display.lineNumWidth = display.lineNumInnerWidth + padding;
michael@0:       display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
michael@0:       display.lineGutter.style.width = display.lineNumWidth + "px";
michael@0:       var width = display.gutters.offsetWidth;
michael@0:       display.scrollbarH.style.left = cm.options.fixedGutter ? width + "px" : 0;
michael@0:       display.sizer.style.marginLeft = width + "px";
michael@0:       return true;
michael@0:     }
michael@0:     return false;
michael@0:   }
michael@0: 
michael@0:   function lineNumberFor(options, i) {
michael@0:     return String(options.lineNumberFormatter(i + options.firstLineNumber));
michael@0:   }
michael@0: 
michael@0:   // Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
michael@0:   // but using getBoundingClientRect to get a sub-pixel-accurate
michael@0:   // result.
michael@0:   function compensateForHScroll(display) {
michael@0:     return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left;
michael@0:   }
michael@0: 
michael@0:   // DISPLAY DRAWING
michael@0: 
michael@0:   // Updates the display, selection, and scrollbars, using the
michael@0:   // information in display.view to find out which nodes are no longer
michael@0:   // up-to-date. Tries to bail out early when no changes are needed,
michael@0:   // unless forced is true.
michael@0:   // Returns true if an actual update happened, false otherwise.
michael@0:   function updateDisplay(cm, viewPort, forced) {
michael@0:     var oldFrom = cm.display.viewFrom, oldTo = cm.display.viewTo, updated;
michael@0:     var visible = visibleLines(cm.display, cm.doc, viewPort);
michael@0:     for (var first = true;; first = false) {
michael@0:       var oldWidth = cm.display.scroller.clientWidth;
michael@0:       if (!updateDisplayInner(cm, visible, forced)) break;
michael@0:       updated = true;
michael@0: 
michael@0:       // If the max line changed since it was last measured, measure it,
michael@0:       // and ensure the document's width matches it.
michael@0:       if (cm.display.maxLineChanged && !cm.options.lineWrapping)
michael@0:         adjustContentWidth(cm);
michael@0: 
michael@0:       var barMeasure = measureForScrollbars(cm);
michael@0:       updateSelection(cm);
michael@0:       setDocumentHeight(cm, barMeasure);
michael@0:       updateScrollbars(cm, barMeasure);
michael@0:       if (first && cm.options.lineWrapping && oldWidth != cm.display.scroller.clientWidth) {
michael@0:         forced = true;
michael@0:         continue;
michael@0:       }
michael@0:       forced = false;
michael@0: 
michael@0:       // Clip forced viewport to actual scrollable area.
michael@0:       if (viewPort && viewPort.top != null)
michael@0:         viewPort = {top: Math.min(barMeasure.docHeight - scrollerCutOff - barMeasure.clientHeight, viewPort.top)};
michael@0:       // Updated line heights might result in the drawn area not
michael@0:       // actually covering the viewport. Keep looping until it does.
michael@0:       visible = visibleLines(cm.display, cm.doc, viewPort);
michael@0:       if (visible.from >= cm.display.viewFrom && visible.to <= cm.display.viewTo)
michael@0:         break;
michael@0:     }
michael@0: 
michael@0:     cm.display.updateLineNumbers = null;
michael@0:     if (updated) {
michael@0:       signalLater(cm, "update", cm);
michael@0:       if (cm.display.viewFrom != oldFrom || cm.display.viewTo != oldTo)
michael@0:         signalLater(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
michael@0:     }
michael@0:     return updated;
michael@0:   }
michael@0: 
michael@0:   // Does the actual updating of the line display. Bails out
michael@0:   // (returning false) when there is nothing to be done and forced is
michael@0:   // false.
michael@0:   function updateDisplayInner(cm, visible, forced) {
michael@0:     var display = cm.display, doc = cm.doc;
michael@0:     if (!display.wrapper.offsetWidth) {
michael@0:       resetView(cm);
michael@0:       return;
michael@0:     }
michael@0: 
michael@0:     // Bail out if the visible area is already rendered and nothing changed.
michael@0:     if (!forced && visible.from >= display.viewFrom && visible.to <= display.viewTo &&
michael@0:         countDirtyView(cm) == 0)
michael@0:       return;
michael@0: 
michael@0:     if (maybeUpdateLineNumberWidth(cm))
michael@0:       resetView(cm);
michael@0:     var dims = getDimensions(cm);
michael@0: 
michael@0:     // Compute a suitable new viewport (from & to)
michael@0:     var end = doc.first + doc.size;
michael@0:     var from = Math.max(visible.from - cm.options.viewportMargin, doc.first);
michael@0:     var to = Math.min(end, visible.to + cm.options.viewportMargin);
michael@0:     if (display.viewFrom < from && from - display.viewFrom < 20) from = Math.max(doc.first, display.viewFrom);
michael@0:     if (display.viewTo > to && display.viewTo - to < 20) to = Math.min(end, display.viewTo);
michael@0:     if (sawCollapsedSpans) {
michael@0:       from = visualLineNo(cm.doc, from);
michael@0:       to = visualLineEndNo(cm.doc, to);
michael@0:     }
michael@0: 
michael@0:     var different = from != display.viewFrom || to != display.viewTo ||
michael@0:       display.lastSizeC != display.wrapper.clientHeight;
michael@0:     adjustView(cm, from, to);
michael@0: 
michael@0:     display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));
michael@0:     // Position the mover div to align with the current scroll position
michael@0:     cm.display.mover.style.top = display.viewOffset + "px";
michael@0: 
michael@0:     var toUpdate = countDirtyView(cm);
michael@0:     if (!different && toUpdate == 0 && !forced) return;
michael@0: 
michael@0:     // For big changes, we hide the enclosing element during the
michael@0:     // update, since that speeds up the operations on most browsers.
michael@0:     var focused = activeElt();
michael@0:     if (toUpdate > 4) display.lineDiv.style.display = "none";
michael@0:     patchDisplay(cm, display.updateLineNumbers, dims);
michael@0:     if (toUpdate > 4) display.lineDiv.style.display = "";
michael@0:     // There might have been a widget with a focused element that got
michael@0:     // hidden or updated, if so re-focus it.
michael@0:     if (focused && activeElt() != focused && focused.offsetHeight) focused.focus();
michael@0: 
michael@0:     // Prevent selection and cursors from interfering with the scroll
michael@0:     // width.
michael@0:     removeChildren(display.cursorDiv);
michael@0:     removeChildren(display.selectionDiv);
michael@0: 
michael@0:     if (different) {
michael@0:       display.lastSizeC = display.wrapper.clientHeight;
michael@0:       startWorker(cm, 400);
michael@0:     }
michael@0: 
michael@0:     updateHeightsInViewport(cm);
michael@0: 
michael@0:     return true;
michael@0:   }
michael@0: 
michael@0:   function adjustContentWidth(cm) {
michael@0:     var display = cm.display;
michael@0:     var width = measureChar(cm, display.maxLine, display.maxLine.text.length).left;
michael@0:     display.maxLineChanged = false;
michael@0:     var minWidth = Math.max(0, width + 3);
michael@0:     var maxScrollLeft = Math.max(0, display.sizer.offsetLeft + minWidth + scrollerCutOff - display.scroller.clientWidth);
michael@0:     display.sizer.style.minWidth = minWidth + "px";
michael@0:     if (maxScrollLeft < cm.doc.scrollLeft)
michael@0:       setScrollLeft(cm, Math.min(display.scroller.scrollLeft, maxScrollLeft), true);
michael@0:   }
michael@0: 
michael@0:   function setDocumentHeight(cm, measure) {
michael@0:     cm.display.sizer.style.minHeight = cm.display.heightForcer.style.top = measure.docHeight + "px";
michael@0:     cm.display.gutters.style.height = Math.max(measure.docHeight, measure.clientHeight - scrollerCutOff) + "px";
michael@0:   }
michael@0: 
michael@0:   // Read the actual heights of the rendered lines, and update their
michael@0:   // stored heights to match.
michael@0:   function updateHeightsInViewport(cm) {
michael@0:     var display = cm.display;
michael@0:     var prevBottom = display.lineDiv.offsetTop;
michael@0:     for (var i = 0; i < display.view.length; i++) {
michael@0:       var cur = display.view[i], height;
michael@0:       if (cur.hidden) continue;
michael@0:       if (ie_upto7) {
michael@0:         var bot = cur.node.offsetTop + cur.node.offsetHeight;
michael@0:         height = bot - prevBottom;
michael@0:         prevBottom = bot;
michael@0:       } else {
michael@0:         var box = cur.node.getBoundingClientRect();
michael@0:         height = box.bottom - box.top;
michael@0:       }
michael@0:       var diff = cur.line.height - height;
michael@0:       if (height < 2) height = textHeight(display);
michael@0:       if (diff > .001 || diff < -.001) {
michael@0:         updateLineHeight(cur.line, height);
michael@0:         updateWidgetHeight(cur.line);
michael@0:         if (cur.rest) for (var j = 0; j < cur.rest.length; j++)
michael@0:           updateWidgetHeight(cur.rest[j]);
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Read and store the height of line widgets associated with the
michael@0:   // given line.
michael@0:   function updateWidgetHeight(line) {
michael@0:     if (line.widgets) for (var i = 0; i < line.widgets.length; ++i)
michael@0:       line.widgets[i].height = line.widgets[i].node.offsetHeight;
michael@0:   }
michael@0: 
michael@0:   // Do a bulk-read of the DOM positions and sizes needed to draw the
michael@0:   // view, so that we don't interleave reading and writing to the DOM.
michael@0:   function getDimensions(cm) {
michael@0:     var d = cm.display, left = {}, width = {};
michael@0:     for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
michael@0:       left[cm.options.gutters[i]] = n.offsetLeft;
michael@0:       width[cm.options.gutters[i]] = n.offsetWidth;
michael@0:     }
michael@0:     return {fixedPos: compensateForHScroll(d),
michael@0:             gutterTotalWidth: d.gutters.offsetWidth,
michael@0:             gutterLeft: left,
michael@0:             gutterWidth: width,
michael@0:             wrapperWidth: d.wrapper.clientWidth};
michael@0:   }
michael@0: 
michael@0:   // Sync the actual display DOM structure with display.view, removing
michael@0:   // nodes for lines that are no longer in view, and creating the ones
michael@0:   // that are not there yet, and updating the ones that are out of
michael@0:   // date.
michael@0:   function patchDisplay(cm, updateNumbersFrom, dims) {
michael@0:     var display = cm.display, lineNumbers = cm.options.lineNumbers;
michael@0:     var container = display.lineDiv, cur = container.firstChild;
michael@0: 
michael@0:     function rm(node) {
michael@0:       var next = node.nextSibling;
michael@0:       // Works around a throw-scroll bug in OS X Webkit
michael@0:       if (webkit && mac && cm.display.currentWheelTarget == node)
michael@0:         node.style.display = "none";
michael@0:       else
michael@0:         node.parentNode.removeChild(node);
michael@0:       return next;
michael@0:     }
michael@0: 
michael@0:     var view = display.view, lineN = display.viewFrom;
michael@0:     // Loop over the elements in the view, syncing cur (the DOM nodes
michael@0:     // in display.lineDiv) with the view as we go.
michael@0:     for (var i = 0; i < view.length; i++) {
michael@0:       var lineView = view[i];
michael@0:       if (lineView.hidden) {
michael@0:       } else if (!lineView.node) { // Not drawn yet
michael@0:         var node = buildLineElement(cm, lineView, lineN, dims);
michael@0:         container.insertBefore(node, cur);
michael@0:       } else { // Already drawn
michael@0:         while (cur != lineView.node) cur = rm(cur);
michael@0:         var updateNumber = lineNumbers && updateNumbersFrom != null &&
michael@0:           updateNumbersFrom <= lineN && lineView.lineNumber;
michael@0:         if (lineView.changes) {
michael@0:           if (indexOf(lineView.changes, "gutter") > -1) updateNumber = false;
michael@0:           updateLineForChanges(cm, lineView, lineN, dims);
michael@0:         }
michael@0:         if (updateNumber) {
michael@0:           removeChildren(lineView.lineNumber);
michael@0:           lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));
michael@0:         }
michael@0:         cur = lineView.node.nextSibling;
michael@0:       }
michael@0:       lineN += lineView.size;
michael@0:     }
michael@0:     while (cur) cur = rm(cur);
michael@0:   }
michael@0: 
michael@0:   // When an aspect of a line changes, a string is added to
michael@0:   // lineView.changes. This updates the relevant part of the line's
michael@0:   // DOM structure.
michael@0:   function updateLineForChanges(cm, lineView, lineN, dims) {
michael@0:     for (var j = 0; j < lineView.changes.length; j++) {
michael@0:       var type = lineView.changes[j];
michael@0:       if (type == "text") updateLineText(cm, lineView);
michael@0:       else if (type == "gutter") updateLineGutter(cm, lineView, lineN, dims);
michael@0:       else if (type == "class") updateLineClasses(lineView);
michael@0:       else if (type == "widget") updateLineWidgets(lineView, dims);
michael@0:     }
michael@0:     lineView.changes = null;
michael@0:   }
michael@0: 
michael@0:   // Lines with gutter elements, widgets or a background class need to
michael@0:   // be wrapped, and have the extra elements added to the wrapper div
michael@0:   function ensureLineWrapped(lineView) {
michael@0:     if (lineView.node == lineView.text) {
michael@0:       lineView.node = elt("div", null, null, "position: relative");
michael@0:       if (lineView.text.parentNode)
michael@0:         lineView.text.parentNode.replaceChild(lineView.node, lineView.text);
michael@0:       lineView.node.appendChild(lineView.text);
michael@0:       if (ie_upto7) lineView.node.style.zIndex = 2;
michael@0:     }
michael@0:     return lineView.node;
michael@0:   }
michael@0: 
michael@0:   function updateLineBackground(lineView) {
michael@0:     var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass;
michael@0:     if (cls) cls += " CodeMirror-linebackground";
michael@0:     if (lineView.background) {
michael@0:       if (cls) lineView.background.className = cls;
michael@0:       else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null; }
michael@0:     } else if (cls) {
michael@0:       var wrap = ensureLineWrapped(lineView);
michael@0:       lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Wrapper around buildLineContent which will reuse the structure
michael@0:   // in display.externalMeasured when possible.
michael@0:   function getLineContent(cm, lineView) {
michael@0:     var ext = cm.display.externalMeasured;
michael@0:     if (ext && ext.line == lineView.line) {
michael@0:       cm.display.externalMeasured = null;
michael@0:       lineView.measure = ext.measure;
michael@0:       return ext.built;
michael@0:     }
michael@0:     return buildLineContent(cm, lineView);
michael@0:   }
michael@0: 
michael@0:   // Redraw the line's text. Interacts with the background and text
michael@0:   // classes because the mode may output tokens that influence these
michael@0:   // classes.
michael@0:   function updateLineText(cm, lineView) {
michael@0:     var cls = lineView.text.className;
michael@0:     var built = getLineContent(cm, lineView);
michael@0:     if (lineView.text == lineView.node) lineView.node = built.pre;
michael@0:     lineView.text.parentNode.replaceChild(built.pre, lineView.text);
michael@0:     lineView.text = built.pre;
michael@0:     if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {
michael@0:       lineView.bgClass = built.bgClass;
michael@0:       lineView.textClass = built.textClass;
michael@0:       updateLineClasses(lineView);
michael@0:     } else if (cls) {
michael@0:       lineView.text.className = cls;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function updateLineClasses(lineView) {
michael@0:     updateLineBackground(lineView);
michael@0:     if (lineView.line.wrapClass)
michael@0:       ensureLineWrapped(lineView).className = lineView.line.wrapClass;
michael@0:     else if (lineView.node != lineView.text)
michael@0:       lineView.node.className = "";
michael@0:     var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass;
michael@0:     lineView.text.className = textClass || "";
michael@0:   }
michael@0: 
michael@0:   function updateLineGutter(cm, lineView, lineN, dims) {
michael@0:     if (lineView.gutter) {
michael@0:       lineView.node.removeChild(lineView.gutter);
michael@0:       lineView.gutter = null;
michael@0:     }
michael@0:     var markers = lineView.line.gutterMarkers;
michael@0:     if (cm.options.lineNumbers || markers) {
michael@0:       var wrap = ensureLineWrapped(lineView);
michael@0:       var gutterWrap = lineView.gutter =
michael@0:         wrap.insertBefore(elt("div", null, "CodeMirror-gutter-wrapper", "position: absolute; left: " +
michael@0:                               (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"),
michael@0:                           lineView.text);
michael@0:       if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))
michael@0:         lineView.lineNumber = gutterWrap.appendChild(
michael@0:           elt("div", lineNumberFor(cm.options, lineN),
michael@0:               "CodeMirror-linenumber CodeMirror-gutter-elt",
michael@0:               "left: " + dims.gutterLeft["CodeMirror-linenumbers"] + "px; width: "
michael@0:               + cm.display.lineNumInnerWidth + "px"));
michael@0:       if (markers) for (var k = 0; k < cm.options.gutters.length; ++k) {
michael@0:         var id = cm.options.gutters[k], found = markers.hasOwnProperty(id) && markers[id];
michael@0:         if (found)
michael@0:           gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt", "left: " +
michael@0:                                      dims.gutterLeft[id] + "px; width: " + dims.gutterWidth[id] + "px"));
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function updateLineWidgets(lineView, dims) {
michael@0:     if (lineView.alignable) lineView.alignable = null;
michael@0:     for (var node = lineView.node.firstChild, next; node; node = next) {
michael@0:       var next = node.nextSibling;
michael@0:       if (node.className == "CodeMirror-linewidget")
michael@0:         lineView.node.removeChild(node);
michael@0:     }
michael@0:     insertLineWidgets(lineView, dims);
michael@0:   }
michael@0: 
michael@0:   // Build a line's DOM representation from scratch
michael@0:   function buildLineElement(cm, lineView, lineN, dims) {
michael@0:     var built = getLineContent(cm, lineView);
michael@0:     lineView.text = lineView.node = built.pre;
michael@0:     if (built.bgClass) lineView.bgClass = built.bgClass;
michael@0:     if (built.textClass) lineView.textClass = built.textClass;
michael@0: 
michael@0:     updateLineClasses(lineView);
michael@0:     updateLineGutter(cm, lineView, lineN, dims);
michael@0:     insertLineWidgets(lineView, dims);
michael@0:     return lineView.node;
michael@0:   }
michael@0: 
michael@0:   // A lineView may contain multiple logical lines (when merged by
michael@0:   // collapsed spans). The widgets for all of them need to be drawn.
michael@0:   function insertLineWidgets(lineView, dims) {
michael@0:     insertLineWidgetsFor(lineView.line, lineView, dims, true);
michael@0:     if (lineView.rest) for (var i = 0; i < lineView.rest.length; i++)
michael@0:       insertLineWidgetsFor(lineView.rest[i], lineView, dims, false);
michael@0:   }
michael@0: 
michael@0:   function insertLineWidgetsFor(line, lineView, dims, allowAbove) {
michael@0:     if (!line.widgets) return;
michael@0:     var wrap = ensureLineWrapped(lineView);
michael@0:     for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
michael@0:       var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget");
michael@0:       if (!widget.handleMouseEvents) node.ignoreEvents = true;
michael@0:       positionLineWidget(widget, node, lineView, dims);
michael@0:       if (allowAbove && widget.above)
michael@0:         wrap.insertBefore(node, lineView.gutter || lineView.text);
michael@0:       else
michael@0:         wrap.appendChild(node);
michael@0:       signalLater(widget, "redraw");
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function positionLineWidget(widget, node, lineView, dims) {
michael@0:     if (widget.noHScroll) {
michael@0:       (lineView.alignable || (lineView.alignable = [])).push(node);
michael@0:       var width = dims.wrapperWidth;
michael@0:       node.style.left = dims.fixedPos + "px";
michael@0:       if (!widget.coverGutter) {
michael@0:         width -= dims.gutterTotalWidth;
michael@0:         node.style.paddingLeft = dims.gutterTotalWidth + "px";
michael@0:       }
michael@0:       node.style.width = width + "px";
michael@0:     }
michael@0:     if (widget.coverGutter) {
michael@0:       node.style.zIndex = 5;
michael@0:       node.style.position = "relative";
michael@0:       if (!widget.noHScroll) node.style.marginLeft = -dims.gutterTotalWidth + "px";
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // POSITION OBJECT
michael@0: 
michael@0:   // A Pos instance represents a position within the text.
michael@0:   var Pos = CodeMirror.Pos = function(line, ch) {
michael@0:     if (!(this instanceof Pos)) return new Pos(line, ch);
michael@0:     this.line = line; this.ch = ch;
michael@0:   };
michael@0: 
michael@0:   // Compare two positions, return 0 if they are the same, a negative
michael@0:   // number when a is less, and a positive number otherwise.
michael@0:   var cmp = CodeMirror.cmpPos = function(a, b) { return a.line - b.line || a.ch - b.ch; };
michael@0: 
michael@0:   function copyPos(x) {return Pos(x.line, x.ch);}
michael@0:   function maxPos(a, b) { return cmp(a, b) < 0 ? b : a; }
michael@0:   function minPos(a, b) { return cmp(a, b) < 0 ? a : b; }
michael@0: 
michael@0:   // SELECTION / CURSOR
michael@0: 
michael@0:   // Selection objects are immutable. A new one is created every time
michael@0:   // the selection changes. A selection is one or more non-overlapping
michael@0:   // (and non-touching) ranges, sorted, and an integer that indicates
michael@0:   // which one is the primary selection (the one that's scrolled into
michael@0:   // view, that getCursor returns, etc).
michael@0:   function Selection(ranges, primIndex) {
michael@0:     this.ranges = ranges;
michael@0:     this.primIndex = primIndex;
michael@0:   }
michael@0: 
michael@0:   Selection.prototype = {
michael@0:     primary: function() { return this.ranges[this.primIndex]; },
michael@0:     equals: function(other) {
michael@0:       if (other == this) return true;
michael@0:       if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) return false;
michael@0:       for (var i = 0; i < this.ranges.length; i++) {
michael@0:         var here = this.ranges[i], there = other.ranges[i];
michael@0:         if (cmp(here.anchor, there.anchor) != 0 || cmp(here.head, there.head) != 0) return false;
michael@0:       }
michael@0:       return true;
michael@0:     },
michael@0:     deepCopy: function() {
michael@0:       for (var out = [], i = 0; i < this.ranges.length; i++)
michael@0:         out[i] = new Range(copyPos(this.ranges[i].anchor), copyPos(this.ranges[i].head));
michael@0:       return new Selection(out, this.primIndex);
michael@0:     },
michael@0:     somethingSelected: function() {
michael@0:       for (var i = 0; i < this.ranges.length; i++)
michael@0:         if (!this.ranges[i].empty()) return true;
michael@0:       return false;
michael@0:     },
michael@0:     contains: function(pos, end) {
michael@0:       if (!end) end = pos;
michael@0:       for (var i = 0; i < this.ranges.length; i++) {
michael@0:         var range = this.ranges[i];
michael@0:         if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0)
michael@0:           return i;
michael@0:       }
michael@0:       return -1;
michael@0:     }
michael@0:   };
michael@0: 
michael@0:   function Range(anchor, head) {
michael@0:     this.anchor = anchor; this.head = head;
michael@0:   }
michael@0: 
michael@0:   Range.prototype = {
michael@0:     from: function() { return minPos(this.anchor, this.head); },
michael@0:     to: function() { return maxPos(this.anchor, this.head); },
michael@0:     empty: function() {
michael@0:       return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch;
michael@0:     }
michael@0:   };
michael@0: 
michael@0:   // Take an unsorted, potentially overlapping set of ranges, and
michael@0:   // build a selection out of it. 'Consumes' ranges array (modifying
michael@0:   // it).
michael@0:   function normalizeSelection(ranges, primIndex) {
michael@0:     var prim = ranges[primIndex];
michael@0:     ranges.sort(function(a, b) { return cmp(a.from(), b.from()); });
michael@0:     primIndex = indexOf(ranges, prim);
michael@0:     for (var i = 1; i < ranges.length; i++) {
michael@0:       var cur = ranges[i], prev = ranges[i - 1];
michael@0:       if (cmp(prev.to(), cur.from()) >= 0) {
michael@0:         var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to());
michael@0:         var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head;
michael@0:         if (i <= primIndex) --primIndex;
michael@0:         ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));
michael@0:       }
michael@0:     }
michael@0:     return new Selection(ranges, primIndex);
michael@0:   }
michael@0: 
michael@0:   function simpleSelection(anchor, head) {
michael@0:     return new Selection([new Range(anchor, head || anchor)], 0);
michael@0:   }
michael@0: 
michael@0:   // Most of the external API clips given positions to make sure they
michael@0:   // actually exist within the document.
michael@0:   function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1));}
michael@0:   function clipPos(doc, pos) {
michael@0:     if (pos.line < doc.first) return Pos(doc.first, 0);
michael@0:     var last = doc.first + doc.size - 1;
michael@0:     if (pos.line > last) return Pos(last, getLine(doc, last).text.length);
michael@0:     return clipToLen(pos, getLine(doc, pos.line).text.length);
michael@0:   }
michael@0:   function clipToLen(pos, linelen) {
michael@0:     var ch = pos.ch;
michael@0:     if (ch == null || ch > linelen) return Pos(pos.line, linelen);
michael@0:     else if (ch < 0) return Pos(pos.line, 0);
michael@0:     else return pos;
michael@0:   }
michael@0:   function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size;}
michael@0:   function clipPosArray(doc, array) {
michael@0:     for (var out = [], i = 0; i < array.length; i++) out[i] = clipPos(doc, array[i]);
michael@0:     return out;
michael@0:   }
michael@0: 
michael@0:   // SELECTION UPDATES
michael@0: 
michael@0:   // The 'scroll' parameter given to many of these indicated whether
michael@0:   // the new cursor position should be scrolled into view after
michael@0:   // modifying the selection.
michael@0: 
michael@0:   // If shift is held or the extend flag is set, extends a range to
michael@0:   // include a given position (and optionally a second position).
michael@0:   // Otherwise, simply returns the range between the given positions.
michael@0:   // Used for cursor motion and such.
michael@0:   function extendRange(doc, range, head, other) {
michael@0:     if (doc.cm && doc.cm.display.shift || doc.extend) {
michael@0:       var anchor = range.anchor;
michael@0:       if (other) {
michael@0:         var posBefore = cmp(head, anchor) < 0;
michael@0:         if (posBefore != (cmp(other, anchor) < 0)) {
michael@0:           anchor = head;
michael@0:           head = other;
michael@0:         } else if (posBefore != (cmp(head, other) < 0)) {
michael@0:           head = other;
michael@0:         }
michael@0:       }
michael@0:       return new Range(anchor, head);
michael@0:     } else {
michael@0:       return new Range(other || head, head);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Extend the primary selection range, discard the rest.
michael@0:   function extendSelection(doc, head, other, options) {
michael@0:     setSelection(doc, new Selection([extendRange(doc, doc.sel.primary(), head, other)], 0), options);
michael@0:   }
michael@0: 
michael@0:   // Extend all selections (pos is an array of selections with length
michael@0:   // equal the number of selections)
michael@0:   function extendSelections(doc, heads, options) {
michael@0:     for (var out = [], i = 0; i < doc.sel.ranges.length; i++)
michael@0:       out[i] = extendRange(doc, doc.sel.ranges[i], heads[i], null);
michael@0:     var newSel = normalizeSelection(out, doc.sel.primIndex);
michael@0:     setSelection(doc, newSel, options);
michael@0:   }
michael@0: 
michael@0:   // Updates a single range in the selection.
michael@0:   function replaceOneSelection(doc, i, range, options) {
michael@0:     var ranges = doc.sel.ranges.slice(0);
michael@0:     ranges[i] = range;
michael@0:     setSelection(doc, normalizeSelection(ranges, doc.sel.primIndex), options);
michael@0:   }
michael@0: 
michael@0:   // Reset the selection to a single range.
michael@0:   function setSimpleSelection(doc, anchor, head, options) {
michael@0:     setSelection(doc, simpleSelection(anchor, head), options);
michael@0:   }
michael@0: 
michael@0:   // Give beforeSelectionChange handlers a change to influence a
michael@0:   // selection update.
michael@0:   function filterSelectionChange(doc, sel) {
michael@0:     var obj = {
michael@0:       ranges: sel.ranges,
michael@0:       update: function(ranges) {
michael@0:         this.ranges = [];
michael@0:         for (var i = 0; i < ranges.length; i++)
michael@0:           this.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
michael@0:                                      clipPos(doc, ranges[i].head));
michael@0:       }
michael@0:     };
michael@0:     signal(doc, "beforeSelectionChange", doc, obj);
michael@0:     if (doc.cm) signal(doc.cm, "beforeSelectionChange", doc.cm, obj);
michael@0:     if (obj.ranges != sel.ranges) return normalizeSelection(obj.ranges, obj.ranges.length - 1);
michael@0:     else return sel;
michael@0:   }
michael@0: 
michael@0:   function setSelectionReplaceHistory(doc, sel, options) {
michael@0:     var done = doc.history.done, last = lst(done);
michael@0:     if (last && last.ranges) {
michael@0:       done[done.length - 1] = sel;
michael@0:       setSelectionNoUndo(doc, sel, options);
michael@0:     } else {
michael@0:       setSelection(doc, sel, options);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Set a new selection.
michael@0:   function setSelection(doc, sel, options) {
michael@0:     setSelectionNoUndo(doc, sel, options);
michael@0:     addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);
michael@0:   }
michael@0: 
michael@0:   function setSelectionNoUndo(doc, sel, options) {
michael@0:     if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange"))
michael@0:       sel = filterSelectionChange(doc, sel);
michael@0: 
michael@0:     var bias = cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1;
michael@0:     setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));
michael@0: 
michael@0:     if (!(options && options.scroll === false) && doc.cm)
michael@0:       ensureCursorVisible(doc.cm);
michael@0:   }
michael@0: 
michael@0:   function setSelectionInner(doc, sel) {
michael@0:     if (sel.equals(doc.sel)) return;
michael@0: 
michael@0:     doc.sel = sel;
michael@0: 
michael@0:     if (doc.cm)
michael@0:       doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged =
michael@0:         doc.cm.curOp.cursorActivity = true;
michael@0:     signalLater(doc, "cursorActivity", doc);
michael@0:   }
michael@0: 
michael@0:   // Verify that the selection does not partially select any atomic
michael@0:   // marked ranges.
michael@0:   function reCheckSelection(doc) {
michael@0:     setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false), sel_dontScroll);
michael@0:   }
michael@0: 
michael@0:   // Return a selection that does not partially select any atomic
michael@0:   // ranges.
michael@0:   function skipAtomicInSelection(doc, sel, bias, mayClear) {
michael@0:     var out;
michael@0:     for (var i = 0; i < sel.ranges.length; i++) {
michael@0:       var range = sel.ranges[i];
michael@0:       var newAnchor = skipAtomic(doc, range.anchor, bias, mayClear);
michael@0:       var newHead = skipAtomic(doc, range.head, bias, mayClear);
michael@0:       if (out || newAnchor != range.anchor || newHead != range.head) {
michael@0:         if (!out) out = sel.ranges.slice(0, i);
michael@0:         out[i] = new Range(newAnchor, newHead);
michael@0:       }
michael@0:     }
michael@0:     return out ? normalizeSelection(out, sel.primIndex) : sel;
michael@0:   }
michael@0: 
michael@0:   // Ensure a given position is not inside an atomic range.
michael@0:   function skipAtomic(doc, pos, bias, mayClear) {
michael@0:     var flipped = false, curPos = pos;
michael@0:     var dir = bias || 1;
michael@0:     doc.cantEdit = false;
michael@0:     search: for (;;) {
michael@0:       var line = getLine(doc, curPos.line);
michael@0:       if (line.markedSpans) {
michael@0:         for (var i = 0; i < line.markedSpans.length; ++i) {
michael@0:           var sp = line.markedSpans[i], m = sp.marker;
michael@0:           if ((sp.from == null || (m.inclusiveLeft ? sp.from <= curPos.ch : sp.from < curPos.ch)) &&
michael@0:               (sp.to == null || (m.inclusiveRight ? sp.to >= curPos.ch : sp.to > curPos.ch))) {
michael@0:             if (mayClear) {
michael@0:               signal(m, "beforeCursorEnter");
michael@0:               if (m.explicitlyCleared) {
michael@0:                 if (!line.markedSpans) break;
michael@0:                 else {--i; continue;}
michael@0:               }
michael@0:             }
michael@0:             if (!m.atomic) continue;
michael@0:             var newPos = m.find(dir < 0 ? -1 : 1);
michael@0:             if (cmp(newPos, curPos) == 0) {
michael@0:               newPos.ch += dir;
michael@0:               if (newPos.ch < 0) {
michael@0:                 if (newPos.line > doc.first) newPos = clipPos(doc, Pos(newPos.line - 1));
michael@0:                 else newPos = null;
michael@0:               } else if (newPos.ch > line.text.length) {
michael@0:                 if (newPos.line < doc.first + doc.size - 1) newPos = Pos(newPos.line + 1, 0);
michael@0:                 else newPos = null;
michael@0:               }
michael@0:               if (!newPos) {
michael@0:                 if (flipped) {
michael@0:                   // Driven in a corner -- no valid cursor position found at all
michael@0:                   // -- try again *with* clearing, if we didn't already
michael@0:                   if (!mayClear) return skipAtomic(doc, pos, bias, true);
michael@0:                   // Otherwise, turn off editing until further notice, and return the start of the doc
michael@0:                   doc.cantEdit = true;
michael@0:                   return Pos(doc.first, 0);
michael@0:                 }
michael@0:                 flipped = true; newPos = pos; dir = -dir;
michael@0:               }
michael@0:             }
michael@0:             curPos = newPos;
michael@0:             continue search;
michael@0:           }
michael@0:         }
michael@0:       }
michael@0:       return curPos;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // SELECTION DRAWING
michael@0: 
michael@0:   // Redraw the selection and/or cursor
michael@0:   function updateSelection(cm) {
michael@0:     var display = cm.display, doc = cm.doc;
michael@0:     var curFragment = document.createDocumentFragment();
michael@0:     var selFragment = document.createDocumentFragment();
michael@0: 
michael@0:     for (var i = 0; i < doc.sel.ranges.length; i++) {
michael@0:       var range = doc.sel.ranges[i];
michael@0:       var collapsed = range.empty();
michael@0:       if (collapsed || cm.options.showCursorWhenSelecting)
michael@0:         updateSelectionCursor(cm, range, curFragment);
michael@0:       if (!collapsed)
michael@0:         updateSelectionRange(cm, range, selFragment);
michael@0:     }
michael@0: 
michael@0:     // Move the hidden textarea near the cursor to prevent scrolling artifacts
michael@0:     if (cm.options.moveInputWithCursor) {
michael@0:       var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
michael@0:       var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect();
michael@0:       var top = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
michael@0:                                      headPos.top + lineOff.top - wrapOff.top));
michael@0:       var left = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
michael@0:                                       headPos.left + lineOff.left - wrapOff.left));
michael@0:       display.inputDiv.style.top = top + "px";
michael@0:       display.inputDiv.style.left = left + "px";
michael@0:     }
michael@0: 
michael@0:     removeChildrenAndAdd(display.cursorDiv, curFragment);
michael@0:     removeChildrenAndAdd(display.selectionDiv, selFragment);
michael@0:   }
michael@0: 
michael@0:   // Draws a cursor for the given range
michael@0:   function updateSelectionCursor(cm, range, output) {
michael@0:     var pos = cursorCoords(cm, range.head, "div");
michael@0: 
michael@0:     var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
michael@0:     cursor.style.left = pos.left + "px";
michael@0:     cursor.style.top = pos.top + "px";
michael@0:     cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";
michael@0: 
michael@0:     if (pos.other) {
michael@0:       // Secondary cursor, shown when on a 'jump' in bi-directional text
michael@0:       var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"));
michael@0:       otherCursor.style.display = "";
michael@0:       otherCursor.style.left = pos.other.left + "px";
michael@0:       otherCursor.style.top = pos.other.top + "px";
michael@0:       otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Draws the given range as a highlighted selection
michael@0:   function updateSelectionRange(cm, range, output) {
michael@0:     var display = cm.display, doc = cm.doc;
michael@0:     var fragment = document.createDocumentFragment();
michael@0:     var padding = paddingH(cm.display), leftSide = padding.left, rightSide = display.lineSpace.offsetWidth - padding.right;
michael@0: 
michael@0:     function add(left, top, width, bottom) {
michael@0:       if (top < 0) top = 0;
michael@0:       fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " + left +
michael@0:                                "px; top: " + top + "px; width: " + (width == null ? rightSide - left : width) +
michael@0:                                "px; height: " + (bottom - top) + "px"));
michael@0:     }
michael@0: 
michael@0:     function drawForLine(line, fromArg, toArg) {
michael@0:       var lineObj = getLine(doc, line);
michael@0:       var lineLen = lineObj.text.length;
michael@0:       var start, end;
michael@0:       function coords(ch, bias) {
michael@0:         return charCoords(cm, Pos(line, ch), "div", lineObj, bias);
michael@0:       }
michael@0: 
michael@0:       iterateBidiSections(getOrder(lineObj), fromArg || 0, toArg == null ? lineLen : toArg, function(from, to, dir) {
michael@0:         var leftPos = coords(from, "left"), rightPos, left, right;
michael@0:         if (from == to) {
michael@0:           rightPos = leftPos;
michael@0:           left = right = leftPos.left;
michael@0:         } else {
michael@0:           rightPos = coords(to - 1, "right");
michael@0:           if (dir == "rtl") { var tmp = leftPos; leftPos = rightPos; rightPos = tmp; }
michael@0:           left = leftPos.left;
michael@0:           right = rightPos.right;
michael@0:         }
michael@0:         if (fromArg == null && from == 0) left = leftSide;
michael@0:         if (rightPos.top - leftPos.top > 3) { // Different lines, draw top part
michael@0:           add(left, leftPos.top, null, leftPos.bottom);
michael@0:           left = leftSide;
michael@0:           if (leftPos.bottom < rightPos.top) add(left, leftPos.bottom, null, rightPos.top);
michael@0:         }
michael@0:         if (toArg == null && to == lineLen) right = rightSide;
michael@0:         if (!start || leftPos.top < start.top || leftPos.top == start.top && leftPos.left < start.left)
michael@0:           start = leftPos;
michael@0:         if (!end || rightPos.bottom > end.bottom || rightPos.bottom == end.bottom && rightPos.right > end.right)
michael@0:           end = rightPos;
michael@0:         if (left < leftSide + 1) left = leftSide;
michael@0:         add(left, rightPos.top, right - left, rightPos.bottom);
michael@0:       });
michael@0:       return {start: start, end: end};
michael@0:     }
michael@0: 
michael@0:     var sFrom = range.from(), sTo = range.to();
michael@0:     if (sFrom.line == sTo.line) {
michael@0:       drawForLine(sFrom.line, sFrom.ch, sTo.ch);
michael@0:     } else {
michael@0:       var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line);
michael@0:       var singleVLine = visualLine(fromLine) == visualLine(toLine);
michael@0:       var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end;
michael@0:       var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start;
michael@0:       if (singleVLine) {
michael@0:         if (leftEnd.top < rightStart.top - 2) {
michael@0:           add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
michael@0:           add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);
michael@0:         } else {
michael@0:           add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
michael@0:         }
michael@0:       }
michael@0:       if (leftEnd.bottom < rightStart.top)
michael@0:         add(leftSide, leftEnd.bottom, null, rightStart.top);
michael@0:     }
michael@0: 
michael@0:     output.appendChild(fragment);
michael@0:   }
michael@0: 
michael@0:   // Cursor-blinking
michael@0:   function restartBlink(cm) {
michael@0:     if (!cm.state.focused) return;
michael@0:     var display = cm.display;
michael@0:     clearInterval(display.blinker);
michael@0:     var on = true;
michael@0:     display.cursorDiv.style.visibility = "";
michael@0:     if (cm.options.cursorBlinkRate > 0)
michael@0:       display.blinker = setInterval(function() {
michael@0:         display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden";
michael@0:       }, cm.options.cursorBlinkRate);
michael@0:   }
michael@0: 
michael@0:   // HIGHLIGHT WORKER
michael@0: 
michael@0:   function startWorker(cm, time) {
michael@0:     if (cm.doc.mode.startState && cm.doc.frontier < cm.display.viewTo)
michael@0:       cm.state.highlight.set(time, bind(highlightWorker, cm));
michael@0:   }
michael@0: 
michael@0:   function highlightWorker(cm) {
michael@0:     var doc = cm.doc;
michael@0:     if (doc.frontier < doc.first) doc.frontier = doc.first;
michael@0:     if (doc.frontier >= cm.display.viewTo) return;
michael@0:     var end = +new Date + cm.options.workTime;
michael@0:     var state = copyState(doc.mode, getStateBefore(cm, doc.frontier));
michael@0: 
michael@0:     runInOp(cm, function() {
michael@0:     doc.iter(doc.frontier, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function(line) {
michael@0:       if (doc.frontier >= cm.display.viewFrom) { // Visible
michael@0:         var oldStyles = line.styles;
michael@0:         line.styles = highlightLine(cm, line, state, true);
michael@0:         var ischange = !oldStyles || oldStyles.length != line.styles.length;
michael@0:         for (var i = 0; !ischange && i < oldStyles.length; ++i) ischange = oldStyles[i] != line.styles[i];
michael@0:         if (ischange) regLineChange(cm, doc.frontier, "text");
michael@0:         line.stateAfter = copyState(doc.mode, state);
michael@0:       } else {
michael@0:         processLine(cm, line.text, state);
michael@0:         line.stateAfter = doc.frontier % 5 == 0 ? copyState(doc.mode, state) : null;
michael@0:       }
michael@0:       ++doc.frontier;
michael@0:       if (+new Date > end) {
michael@0:         startWorker(cm, cm.options.workDelay);
michael@0:         return true;
michael@0:       }
michael@0:     });
michael@0:     });
michael@0:   }
michael@0: 
michael@0:   // Finds the line to start with when starting a parse. Tries to
michael@0:   // find a line with a stateAfter, so that it can start with a
michael@0:   // valid state. If that fails, it returns the line with the
michael@0:   // smallest indentation, which tends to need the least context to
michael@0:   // parse correctly.
michael@0:   function findStartLine(cm, n, precise) {
michael@0:     var minindent, minline, doc = cm.doc;
michael@0:     var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);
michael@0:     for (var search = n; search > lim; --search) {
michael@0:       if (search <= doc.first) return doc.first;
michael@0:       var line = getLine(doc, search - 1);
michael@0:       if (line.stateAfter && (!precise || search <= doc.frontier)) return search;
michael@0:       var indented = countColumn(line.text, null, cm.options.tabSize);
michael@0:       if (minline == null || minindent > indented) {
michael@0:         minline = search - 1;
michael@0:         minindent = indented;
michael@0:       }
michael@0:     }
michael@0:     return minline;
michael@0:   }
michael@0: 
michael@0:   function getStateBefore(cm, n, precise) {
michael@0:     var doc = cm.doc, display = cm.display;
michael@0:     if (!doc.mode.startState) return true;
michael@0:     var pos = findStartLine(cm, n, precise), state = pos > doc.first && getLine(doc, pos-1).stateAfter;
michael@0:     if (!state) state = startState(doc.mode);
michael@0:     else state = copyState(doc.mode, state);
michael@0:     doc.iter(pos, n, function(line) {
michael@0:       processLine(cm, line.text, state);
michael@0:       var save = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo;
michael@0:       line.stateAfter = save ? copyState(doc.mode, state) : null;
michael@0:       ++pos;
michael@0:     });
michael@0:     if (precise) doc.frontier = pos;
michael@0:     return state;
michael@0:   }
michael@0: 
michael@0:   // POSITION MEASUREMENT
michael@0: 
michael@0:   function paddingTop(display) {return display.lineSpace.offsetTop;}
michael@0:   function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight;}
michael@0:   function paddingH(display) {
michael@0:     if (display.cachedPaddingH) return display.cachedPaddingH;
michael@0:     var e = removeChildrenAndAdd(display.measure, elt("pre", "x"));
michael@0:     var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle;
michael@0:     return display.cachedPaddingH = {left: parseInt(style.paddingLeft),
michael@0:                                      right: parseInt(style.paddingRight)};
michael@0:   }
michael@0: 
michael@0:   // Ensure the lineView.wrapping.heights array is populated. This is
michael@0:   // an array of bottom offsets for the lines that make up a drawn
michael@0:   // line. When lineWrapping is on, there might be more than one
michael@0:   // height.
michael@0:   function ensureLineHeights(cm, lineView, rect) {
michael@0:     var wrapping = cm.options.lineWrapping;
michael@0:     var curWidth = wrapping && cm.display.scroller.clientWidth;
michael@0:     if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
michael@0:       var heights = lineView.measure.heights = [];
michael@0:       if (wrapping) {
michael@0:         lineView.measure.width = curWidth;
michael@0:         var rects = lineView.text.firstChild.getClientRects();
michael@0:         for (var i = 0; i < rects.length - 1; i++) {
michael@0:           var cur = rects[i], next = rects[i + 1];
michael@0:           if (Math.abs(cur.bottom - next.bottom) > 2)
michael@0:             heights.push((cur.bottom + next.top) / 2 - rect.top);
michael@0:         }
michael@0:       }
michael@0:       heights.push(rect.bottom - rect.top);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Find a line map (mapping character offsets to text nodes) and a
michael@0:   // measurement cache for the given line number. (A line view might
michael@0:   // contain multiple lines when collapsed ranges are present.)
michael@0:   function mapFromLineView(lineView, line, lineN) {
michael@0:     if (lineView.line == line)
michael@0:       return {map: lineView.measure.map, cache: lineView.measure.cache};
michael@0:     for (var i = 0; i < lineView.rest.length; i++)
michael@0:       if (lineView.rest[i] == line)
michael@0:         return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]};
michael@0:     for (var i = 0; i < lineView.rest.length; i++)
michael@0:       if (lineNo(lineView.rest[i]) > lineN)
michael@0:         return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i], before: true};
michael@0:   }
michael@0: 
michael@0:   // Render a line into the hidden node display.externalMeasured. Used
michael@0:   // when measurement is needed for a line that's not in the viewport.
michael@0:   function updateExternalMeasurement(cm, line) {
michael@0:     line = visualLine(line);
michael@0:     var lineN = lineNo(line);
michael@0:     var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);
michael@0:     view.lineN = lineN;
michael@0:     var built = view.built = buildLineContent(cm, view);
michael@0:     view.text = built.pre;
michael@0:     removeChildrenAndAdd(cm.display.lineMeasure, built.pre);
michael@0:     return view;
michael@0:   }
michael@0: 
michael@0:   // Get a {top, bottom, left, right} box (in line-local coordinates)
michael@0:   // for a given character.
michael@0:   function measureChar(cm, line, ch, bias) {
michael@0:     return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias);
michael@0:   }
michael@0: 
michael@0:   // Find a line view that corresponds to the given line number.
michael@0:   function findViewForLine(cm, lineN) {
michael@0:     if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)
michael@0:       return cm.display.view[findViewIndex(cm, lineN)];
michael@0:     var ext = cm.display.externalMeasured;
michael@0:     if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)
michael@0:       return ext;
michael@0:   }
michael@0: 
michael@0:   // Measurement can be split in two steps, the set-up work that
michael@0:   // applies to the whole line, and the measurement of the actual
michael@0:   // character. Functions like coordsChar, that need to do a lot of
michael@0:   // measurements in a row, can thus ensure that the set-up work is
michael@0:   // only done once.
michael@0:   function prepareMeasureForLine(cm, line) {
michael@0:     var lineN = lineNo(line);
michael@0:     var view = findViewForLine(cm, lineN);
michael@0:     if (view && !view.text)
michael@0:       view = null;
michael@0:     else if (view && view.changes)
michael@0:       updateLineForChanges(cm, view, lineN, getDimensions(cm));
michael@0:     if (!view)
michael@0:       view = updateExternalMeasurement(cm, line);
michael@0: 
michael@0:     var info = mapFromLineView(view, line, lineN);
michael@0:     return {
michael@0:       line: line, view: view, rect: null,
michael@0:       map: info.map, cache: info.cache, before: info.before,
michael@0:       hasHeights: false
michael@0:     };
michael@0:   }
michael@0: 
michael@0:   // Given a prepared measurement object, measures the position of an
michael@0:   // actual character (or fetches it from the cache).
michael@0:   function measureCharPrepared(cm, prepared, ch, bias) {
michael@0:     if (prepared.before) ch = -1;
michael@0:     var key = ch + (bias || ""), found;
michael@0:     if (prepared.cache.hasOwnProperty(key)) {
michael@0:       found = prepared.cache[key];
michael@0:     } else {
michael@0:       if (!prepared.rect)
michael@0:         prepared.rect = prepared.view.text.getBoundingClientRect();
michael@0:       if (!prepared.hasHeights) {
michael@0:         ensureLineHeights(cm, prepared.view, prepared.rect);
michael@0:         prepared.hasHeights = true;
michael@0:       }
michael@0:       found = measureCharInner(cm, prepared, ch, bias);
michael@0:       if (!found.bogus) prepared.cache[key] = found;
michael@0:     }
michael@0:     return {left: found.left, right: found.right, top: found.top, bottom: found.bottom};
michael@0:   }
michael@0: 
michael@0:   var nullRect = {left: 0, right: 0, top: 0, bottom: 0};
michael@0: 
michael@0:   function measureCharInner(cm, prepared, ch, bias) {
michael@0:     var map = prepared.map;
michael@0: 
michael@0:     var node, start, end, collapse;
michael@0:     // First, search the line map for the text node corresponding to,
michael@0:     // or closest to, the target character.
michael@0:     for (var i = 0; i < map.length; i += 3) {
michael@0:       var mStart = map[i], mEnd = map[i + 1];
michael@0:       if (ch < mStart) {
michael@0:         start = 0; end = 1;
michael@0:         collapse = "left";
michael@0:       } else if (ch < mEnd) {
michael@0:         start = ch - mStart;
michael@0:         end = start + 1;
michael@0:       } else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {
michael@0:         end = mEnd - mStart;
michael@0:         start = end - 1;
michael@0:         if (ch >= mEnd) collapse = "right";
michael@0:       }
michael@0:       if (start != null) {
michael@0:         node = map[i + 2];
michael@0:         if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right"))
michael@0:           collapse = bias;
michael@0:         if (bias == "left" && start == 0)
michael@0:           while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {
michael@0:             node = map[(i -= 3) + 2];
michael@0:             collapse = "left";
michael@0:           }
michael@0:         if (bias == "right" && start == mEnd - mStart)
michael@0:           while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {
michael@0:             node = map[(i += 3) + 2];
michael@0:             collapse = "right";
michael@0:           }
michael@0:         break;
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     var rect;
michael@0:     if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
michael@0:       while (start && isExtendingChar(prepared.line.text.charAt(mStart + start))) --start;
michael@0:       while (mStart + end < mEnd && isExtendingChar(prepared.line.text.charAt(mStart + end))) ++end;
michael@0:       if (ie_upto8 && start == 0 && end == mEnd - mStart) {
michael@0:         rect = node.parentNode.getBoundingClientRect();
michael@0:       } else if (ie && cm.options.lineWrapping) {
michael@0:         var rects = range(node, start, end).getClientRects();
michael@0:         if (rects.length)
michael@0:           rect = rects[bias == "right" ? rects.length - 1 : 0];
michael@0:         else
michael@0:           rect = nullRect;
michael@0:       } else {
michael@0:         rect = range(node, start, end).getBoundingClientRect();
michael@0:       }
michael@0:     } else { // If it is a widget, simply get the box for the whole widget.
michael@0:       if (start > 0) collapse = bias = "right";
michael@0:       var rects;
michael@0:       if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)
michael@0:         rect = rects[bias == "right" ? rects.length - 1 : 0];
michael@0:       else
michael@0:         rect = node.getBoundingClientRect();
michael@0:     }
michael@0:     if (ie_upto8 && !start && (!rect || !rect.left && !rect.right)) {
michael@0:       var rSpan = node.parentNode.getClientRects()[0];
michael@0:       if (rSpan)
michael@0:         rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom};
michael@0:       else
michael@0:         rect = nullRect;
michael@0:     }
michael@0: 
michael@0:     var top, bot = (rect.bottom + rect.top) / 2 - prepared.rect.top;
michael@0:     var heights = prepared.view.measure.heights;
michael@0:     for (var i = 0; i < heights.length - 1; i++)
michael@0:       if (bot < heights[i]) break;
michael@0:     top = i ? heights[i - 1] : 0; bot = heights[i];
michael@0:     var result = {left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
michael@0:                   right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
michael@0:                   top: top, bottom: bot};
michael@0:     if (!rect.left && !rect.right) result.bogus = true;
michael@0:     return result;
michael@0:   }
michael@0: 
michael@0:   function clearLineMeasurementCacheFor(lineView) {
michael@0:     if (lineView.measure) {
michael@0:       lineView.measure.cache = {};
michael@0:       lineView.measure.heights = null;
michael@0:       if (lineView.rest) for (var i = 0; i < lineView.rest.length; i++)
michael@0:         lineView.measure.caches[i] = {};
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function clearLineMeasurementCache(cm) {
michael@0:     cm.display.externalMeasure = null;
michael@0:     removeChildren(cm.display.lineMeasure);
michael@0:     for (var i = 0; i < cm.display.view.length; i++)
michael@0:       clearLineMeasurementCacheFor(cm.display.view[i]);
michael@0:   }
michael@0: 
michael@0:   function clearCaches(cm) {
michael@0:     clearLineMeasurementCache(cm);
michael@0:     cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null;
michael@0:     if (!cm.options.lineWrapping) cm.display.maxLineChanged = true;
michael@0:     cm.display.lineNumChars = null;
michael@0:   }
michael@0: 
michael@0:   function pageScrollX() { return window.pageXOffset || (document.documentElement || document.body).scrollLeft; }
michael@0:   function pageScrollY() { return window.pageYOffset || (document.documentElement || document.body).scrollTop; }
michael@0: 
michael@0:   // Converts a {top, bottom, left, right} box from line-local
michael@0:   // coordinates into another coordinate system. Context may be one of
michael@0:   // "line", "div" (display.lineDiv), "local"/null (editor), or "page".
michael@0:   function intoCoordSystem(cm, lineObj, rect, context) {
michael@0:     if (lineObj.widgets) for (var i = 0; i < lineObj.widgets.length; ++i) if (lineObj.widgets[i].above) {
michael@0:       var size = widgetHeight(lineObj.widgets[i]);
michael@0:       rect.top += size; rect.bottom += size;
michael@0:     }
michael@0:     if (context == "line") return rect;
michael@0:     if (!context) context = "local";
michael@0:     var yOff = heightAtLine(lineObj);
michael@0:     if (context == "local") yOff += paddingTop(cm.display);
michael@0:     else yOff -= cm.display.viewOffset;
michael@0:     if (context == "page" || context == "window") {
michael@0:       var lOff = cm.display.lineSpace.getBoundingClientRect();
michael@0:       yOff += lOff.top + (context == "window" ? 0 : pageScrollY());
michael@0:       var xOff = lOff.left + (context == "window" ? 0 : pageScrollX());
michael@0:       rect.left += xOff; rect.right += xOff;
michael@0:     }
michael@0:     rect.top += yOff; rect.bottom += yOff;
michael@0:     return rect;
michael@0:   }
michael@0: 
michael@0:   // Coverts a box from "div" coords to another coordinate system.
michael@0:   // Context may be "window", "page", "div", or "local"/null.
michael@0:   function fromCoordSystem(cm, coords, context) {
michael@0:     if (context == "div") return coords;
michael@0:     var left = coords.left, top = coords.top;
michael@0:     // First move into "page" coordinate system
michael@0:     if (context == "page") {
michael@0:       left -= pageScrollX();
michael@0:       top -= pageScrollY();
michael@0:     } else if (context == "local" || !context) {
michael@0:       var localBox = cm.display.sizer.getBoundingClientRect();
michael@0:       left += localBox.left;
michael@0:       top += localBox.top;
michael@0:     }
michael@0: 
michael@0:     var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();
michael@0:     return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top};
michael@0:   }
michael@0: 
michael@0:   function charCoords(cm, pos, context, lineObj, bias) {
michael@0:     if (!lineObj) lineObj = getLine(cm.doc, pos.line);
michael@0:     return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context);
michael@0:   }
michael@0: 
michael@0:   // Returns a box for a given cursor position, which may have an
michael@0:   // 'other' property containing the position of the secondary cursor
michael@0:   // on a bidi boundary.
michael@0:   function cursorCoords(cm, pos, context, lineObj, preparedMeasure) {
michael@0:     lineObj = lineObj || getLine(cm.doc, pos.line);
michael@0:     if (!preparedMeasure) preparedMeasure = prepareMeasureForLine(cm, lineObj);
michael@0:     function get(ch, right) {
michael@0:       var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left");
michael@0:       if (right) m.left = m.right; else m.right = m.left;
michael@0:       return intoCoordSystem(cm, lineObj, m, context);
michael@0:     }
michael@0:     function getBidi(ch, partPos) {
michael@0:       var part = order[partPos], right = part.level % 2;
michael@0:       if (ch == bidiLeft(part) && partPos && part.level < order[partPos - 1].level) {
michael@0:         part = order[--partPos];
michael@0:         ch = bidiRight(part) - (part.level % 2 ? 0 : 1);
michael@0:         right = true;
michael@0:       } else if (ch == bidiRight(part) && partPos < order.length - 1 && part.level < order[partPos + 1].level) {
michael@0:         part = order[++partPos];
michael@0:         ch = bidiLeft(part) - part.level % 2;
michael@0:         right = false;
michael@0:       }
michael@0:       if (right && ch == part.to && ch > part.from) return get(ch - 1);
michael@0:       return get(ch, right);
michael@0:     }
michael@0:     var order = getOrder(lineObj), ch = pos.ch;
michael@0:     if (!order) return get(ch);
michael@0:     var partPos = getBidiPartAt(order, ch);
michael@0:     var val = getBidi(ch, partPos);
michael@0:     if (bidiOther != null) val.other = getBidi(ch, bidiOther);
michael@0:     return val;
michael@0:   }
michael@0: 
michael@0:   // Used to cheaply estimate the coordinates for a position. Used for
michael@0:   // intermediate scroll updates.
michael@0:   function estimateCoords(cm, pos) {
michael@0:     var left = 0, pos = clipPos(cm.doc, pos);
michael@0:     if (!cm.options.lineWrapping) left = charWidth(cm.display) * pos.ch;
michael@0:     var lineObj = getLine(cm.doc, pos.line);
michael@0:     var top = heightAtLine(lineObj) + paddingTop(cm.display);
michael@0:     return {left: left, right: left, top: top, bottom: top + lineObj.height};
michael@0:   }
michael@0: 
michael@0:   // Positions returned by coordsChar contain some extra information.
michael@0:   // xRel is the relative x position of the input coordinates compared
michael@0:   // to the found position (so xRel > 0 means the coordinates are to
michael@0:   // the right of the character position, for example). When outside
michael@0:   // is true, that means the coordinates lie outside the line's
michael@0:   // vertical range.
michael@0:   function PosWithInfo(line, ch, outside, xRel) {
michael@0:     var pos = Pos(line, ch);
michael@0:     pos.xRel = xRel;
michael@0:     if (outside) pos.outside = true;
michael@0:     return pos;
michael@0:   }
michael@0: 
michael@0:   // Compute the character position closest to the given coordinates.
michael@0:   // Input must be lineSpace-local ("div" coordinate system).
michael@0:   function coordsChar(cm, x, y) {
michael@0:     var doc = cm.doc;
michael@0:     y += cm.display.viewOffset;
michael@0:     if (y < 0) return PosWithInfo(doc.first, 0, true, -1);
michael@0:     var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1;
michael@0:     if (lineN > last)
michael@0:       return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, true, 1);
michael@0:     if (x < 0) x = 0;
michael@0: 
michael@0:     var lineObj = getLine(doc, lineN);
michael@0:     for (;;) {
michael@0:       var found = coordsCharInner(cm, lineObj, lineN, x, y);
michael@0:       var merged = collapsedSpanAtEnd(lineObj);
michael@0:       var mergedPos = merged && merged.find(0, true);
michael@0:       if (merged && (found.ch > mergedPos.from.ch || found.ch == mergedPos.from.ch && found.xRel > 0))
michael@0:         lineN = lineNo(lineObj = mergedPos.to.line);
michael@0:       else
michael@0:         return found;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function coordsCharInner(cm, lineObj, lineNo, x, y) {
michael@0:     var innerOff = y - heightAtLine(lineObj);
michael@0:     var wrongLine = false, adjust = 2 * cm.display.wrapper.clientWidth;
michael@0:     var preparedMeasure = prepareMeasureForLine(cm, lineObj);
michael@0: 
michael@0:     function getX(ch) {
michael@0:       var sp = cursorCoords(cm, Pos(lineNo, ch), "line", lineObj, preparedMeasure);
michael@0:       wrongLine = true;
michael@0:       if (innerOff > sp.bottom) return sp.left - adjust;
michael@0:       else if (innerOff < sp.top) return sp.left + adjust;
michael@0:       else wrongLine = false;
michael@0:       return sp.left;
michael@0:     }
michael@0: 
michael@0:     var bidi = getOrder(lineObj), dist = lineObj.text.length;
michael@0:     var from = lineLeft(lineObj), to = lineRight(lineObj);
michael@0:     var fromX = getX(from), fromOutside = wrongLine, toX = getX(to), toOutside = wrongLine;
michael@0: 
michael@0:     if (x > toX) return PosWithInfo(lineNo, to, toOutside, 1);
michael@0:     // Do a binary search between these bounds.
michael@0:     for (;;) {
michael@0:       if (bidi ? to == from || to == moveVisually(lineObj, from, 1) : to - from <= 1) {
michael@0:         var ch = x < fromX || x - fromX <= toX - x ? from : to;
michael@0:         var xDiff = x - (ch == from ? fromX : toX);
michael@0:         while (isExtendingChar(lineObj.text.charAt(ch))) ++ch;
michael@0:         var pos = PosWithInfo(lineNo, ch, ch == from ? fromOutside : toOutside,
michael@0:                               xDiff < -1 ? -1 : xDiff > 1 ? 1 : 0);
michael@0:         return pos;
michael@0:       }
michael@0:       var step = Math.ceil(dist / 2), middle = from + step;
michael@0:       if (bidi) {
michael@0:         middle = from;
michael@0:         for (var i = 0; i < step; ++i) middle = moveVisually(lineObj, middle, 1);
michael@0:       }
michael@0:       var middleX = getX(middle);
michael@0:       if (middleX > x) {to = middle; toX = middleX; if (toOutside = wrongLine) toX += 1000; dist = step;}
michael@0:       else {from = middle; fromX = middleX; fromOutside = wrongLine; dist -= step;}
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   var measureText;
michael@0:   // Compute the default text height.
michael@0:   function textHeight(display) {
michael@0:     if (display.cachedTextHeight != null) return display.cachedTextHeight;
michael@0:     if (measureText == null) {
michael@0:       measureText = elt("pre");
michael@0:       // Measure a bunch of lines, for browsers that compute
michael@0:       // fractional heights.
michael@0:       for (var i = 0; i < 49; ++i) {
michael@0:         measureText.appendChild(document.createTextNode("x"));
michael@0:         measureText.appendChild(elt("br"));
michael@0:       }
michael@0:       measureText.appendChild(document.createTextNode("x"));
michael@0:     }
michael@0:     removeChildrenAndAdd(display.measure, measureText);
michael@0:     var height = measureText.offsetHeight / 50;
michael@0:     if (height > 3) display.cachedTextHeight = height;
michael@0:     removeChildren(display.measure);
michael@0:     return height || 1;
michael@0:   }
michael@0: 
michael@0:   // Compute the default character width.
michael@0:   function charWidth(display) {
michael@0:     if (display.cachedCharWidth != null) return display.cachedCharWidth;
michael@0:     var anchor = elt("span", "xxxxxxxxxx");
michael@0:     var pre = elt("pre", [anchor]);
michael@0:     removeChildrenAndAdd(display.measure, pre);
michael@0:     var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10;
michael@0:     if (width > 2) display.cachedCharWidth = width;
michael@0:     return width || 10;
michael@0:   }
michael@0: 
michael@0:   // OPERATIONS
michael@0: 
michael@0:   // Operations are used to wrap a series of changes to the editor
michael@0:   // state in such a way that each change won't have to update the
michael@0:   // cursor and display (which would be awkward, slow, and
michael@0:   // error-prone). Instead, display updates are batched and then all
michael@0:   // combined and executed at once.
michael@0: 
michael@0:   var nextOpId = 0;
michael@0:   // Start a new operation.
michael@0:   function startOperation(cm) {
michael@0:     cm.curOp = {
michael@0:       viewChanged: false,      // Flag that indicates that lines might need to be redrawn
michael@0:       startHeight: cm.doc.height, // Used to detect need to update scrollbar
michael@0:       forceUpdate: false,      // Used to force a redraw
michael@0:       updateInput: null,       // Whether to reset the input textarea
michael@0:       typing: false,           // Whether this reset should be careful to leave existing text (for compositing)
michael@0:       changeObjs: null,        // Accumulated changes, for firing change events
michael@0:       cursorActivity: false,   // Whether to fire a cursorActivity event
michael@0:       selectionChanged: false, // Whether the selection needs to be redrawn
michael@0:       updateMaxLine: false,    // Set when the widest line needs to be determined anew
michael@0:       scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
michael@0:       scrollToPos: null,       // Used to scroll to a specific position
michael@0:       id: ++nextOpId           // Unique ID
michael@0:     };
michael@0:     if (!delayedCallbackDepth++) delayedCallbacks = [];
michael@0:   }
michael@0: 
michael@0:   // Finish an operation, updating the display and signalling delayed events
michael@0:   function endOperation(cm) {
michael@0:     var op = cm.curOp, doc = cm.doc, display = cm.display;
michael@0:     cm.curOp = null;
michael@0: 
michael@0:     if (op.updateMaxLine) findMaxLine(cm);
michael@0: 
michael@0:     // If it looks like an update might be needed, call updateDisplay
michael@0:     if (op.viewChanged || op.forceUpdate || op.scrollTop != null ||
michael@0:         op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||
michael@0:                            op.scrollToPos.to.line >= display.viewTo) ||
michael@0:         display.maxLineChanged && cm.options.lineWrapping) {
michael@0:       var updated = updateDisplay(cm, {top: op.scrollTop, ensure: op.scrollToPos}, op.forceUpdate);
michael@0:       if (cm.display.scroller.offsetHeight) cm.doc.scrollTop = cm.display.scroller.scrollTop;
michael@0:     }
michael@0:     // If no update was run, but the selection changed, redraw that.
michael@0:     if (!updated && op.selectionChanged) updateSelection(cm);
michael@0:     if (!updated && op.startHeight != cm.doc.height) updateScrollbars(cm);
michael@0: 
michael@0:     // Propagate the scroll position to the actual DOM scroller
michael@0:     if (op.scrollTop != null && display.scroller.scrollTop != op.scrollTop) {
michael@0:       var top = Math.max(0, Math.min(display.scroller.scrollHeight - display.scroller.clientHeight, op.scrollTop));
michael@0:       display.scroller.scrollTop = display.scrollbarV.scrollTop = doc.scrollTop = top;
michael@0:     }
michael@0:     if (op.scrollLeft != null && display.scroller.scrollLeft != op.scrollLeft) {
michael@0:       var left = Math.max(0, Math.min(display.scroller.scrollWidth - display.scroller.clientWidth, op.scrollLeft));
michael@0:       display.scroller.scrollLeft = display.scrollbarH.scrollLeft = doc.scrollLeft = left;
michael@0:       alignHorizontally(cm);
michael@0:     }
michael@0:     // If we need to scroll a specific position into view, do so.
michael@0:     if (op.scrollToPos) {
michael@0:       var coords = scrollPosIntoView(cm, clipPos(cm.doc, op.scrollToPos.from),
michael@0:                                      clipPos(cm.doc, op.scrollToPos.to), op.scrollToPos.margin);
michael@0:       if (op.scrollToPos.isCursor && cm.state.focused) maybeScrollWindow(cm, coords);
michael@0:     }
michael@0: 
michael@0:     if (op.selectionChanged) restartBlink(cm);
michael@0: 
michael@0:     if (cm.state.focused && op.updateInput)
michael@0:       resetInput(cm, op.typing);
michael@0: 
michael@0:     // Fire events for markers that are hidden/unidden by editing or
michael@0:     // undoing
michael@0:     var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;
michael@0:     if (hidden) for (var i = 0; i < hidden.length; ++i)
michael@0:       if (!hidden[i].lines.length) signal(hidden[i], "hide");
michael@0:     if (unhidden) for (var i = 0; i < unhidden.length; ++i)
michael@0:       if (unhidden[i].lines.length) signal(unhidden[i], "unhide");
michael@0: 
michael@0:     var delayed;
michael@0:     if (!--delayedCallbackDepth) {
michael@0:       delayed = delayedCallbacks;
michael@0:       delayedCallbacks = null;
michael@0:     }
michael@0:     // Fire change events, and delayed event handlers
michael@0:     if (op.changeObjs) {
michael@0:       for (var i = 0; i < op.changeObjs.length; i++)
michael@0:         signal(cm, "change", cm, op.changeObjs[i]);
michael@0:       signal(cm, "changes", cm, op.changeObjs);
michael@0:     }
michael@0:     if (op.cursorActivity) signal(cm, "cursorActivity", cm);
michael@0:     if (delayed) for (var i = 0; i < delayed.length; ++i) delayed[i]();
michael@0:   }
michael@0: 
michael@0:   // Run the given function in an operation
michael@0:   function runInOp(cm, f) {
michael@0:     if (cm.curOp) return f();
michael@0:     startOperation(cm);
michael@0:     try { return f(); }
michael@0:     finally { endOperation(cm); }
michael@0:   }
michael@0:   // Wraps a function in an operation. Returns the wrapped function.
michael@0:   function operation(cm, f) {
michael@0:     return function() {
michael@0:       if (cm.curOp) return f.apply(cm, arguments);
michael@0:       startOperation(cm);
michael@0:       try { return f.apply(cm, arguments); }
michael@0:       finally { endOperation(cm); }
michael@0:     };
michael@0:   }
michael@0:   // Used to add methods to editor and doc instances, wrapping them in
michael@0:   // operations.
michael@0:   function methodOp(f) {
michael@0:     return function() {
michael@0:       if (this.curOp) return f.apply(this, arguments);
michael@0:       startOperation(this);
michael@0:       try { return f.apply(this, arguments); }
michael@0:       finally { endOperation(this); }
michael@0:     };
michael@0:   }
michael@0:   function docMethodOp(f) {
michael@0:     return function() {
michael@0:       var cm = this.cm;
michael@0:       if (!cm || cm.curOp) return f.apply(this, arguments);
michael@0:       startOperation(cm);
michael@0:       try { return f.apply(this, arguments); }
michael@0:       finally { endOperation(cm); }
michael@0:     };
michael@0:   }
michael@0: 
michael@0:   // VIEW TRACKING
michael@0: 
michael@0:   // These objects are used to represent the visible (currently drawn)
michael@0:   // part of the document. A LineView may correspond to multiple
michael@0:   // logical lines, if those are connected by collapsed ranges.
michael@0:   function LineView(doc, line, lineN) {
michael@0:     // The starting line
michael@0:     this.line = line;
michael@0:     // Continuing lines, if any
michael@0:     this.rest = visualLineContinued(line);
michael@0:     // Number of logical lines in this visual line
michael@0:     this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;
michael@0:     this.node = this.text = null;
michael@0:     this.hidden = lineIsHidden(doc, line);
michael@0:   }
michael@0: 
michael@0:   // Create a range of LineView objects for the given lines.
michael@0:   function buildViewArray(cm, from, to) {
michael@0:     var array = [], nextPos;
michael@0:     for (var pos = from; pos < to; pos = nextPos) {
michael@0:       var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);
michael@0:       nextPos = pos + view.size;
michael@0:       array.push(view);
michael@0:     }
michael@0:     return array;
michael@0:   }
michael@0: 
michael@0:   // Updates the display.view data structure for a given change to the
michael@0:   // document. From and to are in pre-change coordinates. Lendiff is
michael@0:   // the amount of lines added or subtracted by the change. This is
michael@0:   // used for changes that span multiple lines, or change the way
michael@0:   // lines are divided into visual lines. regLineChange (below)
michael@0:   // registers single-line changes.
michael@0:   function regChange(cm, from, to, lendiff) {
michael@0:     if (from == null) from = cm.doc.first;
michael@0:     if (to == null) to = cm.doc.first + cm.doc.size;
michael@0:     if (!lendiff) lendiff = 0;
michael@0: 
michael@0:     var display = cm.display;
michael@0:     if (lendiff && to < display.viewTo &&
michael@0:         (display.updateLineNumbers == null || display.updateLineNumbers > from))
michael@0:       display.updateLineNumbers = from;
michael@0: 
michael@0:     cm.curOp.viewChanged = true;
michael@0: 
michael@0:     if (from >= display.viewTo) { // Change after
michael@0:       if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo)
michael@0:         resetView(cm);
michael@0:     } else if (to <= display.viewFrom) { // Change before
michael@0:       if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
michael@0:         resetView(cm);
michael@0:       } else {
michael@0:         display.viewFrom += lendiff;
michael@0:         display.viewTo += lendiff;
michael@0:       }
michael@0:     } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
michael@0:       resetView(cm);
michael@0:     } else if (from <= display.viewFrom) { // Top overlap
michael@0:       var cut = viewCuttingPoint(cm, to, to + lendiff, 1);
michael@0:       if (cut) {
michael@0:         display.view = display.view.slice(cut.index);
michael@0:         display.viewFrom = cut.lineN;
michael@0:         display.viewTo += lendiff;
michael@0:       } else {
michael@0:         resetView(cm);
michael@0:       }
michael@0:     } else if (to >= display.viewTo) { // Bottom overlap
michael@0:       var cut = viewCuttingPoint(cm, from, from, -1);
michael@0:       if (cut) {
michael@0:         display.view = display.view.slice(0, cut.index);
michael@0:         display.viewTo = cut.lineN;
michael@0:       } else {
michael@0:         resetView(cm);
michael@0:       }
michael@0:     } else { // Gap in the middle
michael@0:       var cutTop = viewCuttingPoint(cm, from, from, -1);
michael@0:       var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);
michael@0:       if (cutTop && cutBot) {
michael@0:         display.view = display.view.slice(0, cutTop.index)
michael@0:           .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
michael@0:           .concat(display.view.slice(cutBot.index));
michael@0:         display.viewTo += lendiff;
michael@0:       } else {
michael@0:         resetView(cm);
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     var ext = display.externalMeasured;
michael@0:     if (ext) {
michael@0:       if (to < ext.lineN)
michael@0:         ext.lineN += lendiff;
michael@0:       else if (from < ext.lineN + ext.size)
michael@0:         display.externalMeasured = null;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Register a change to a single line. Type must be one of "text",
michael@0:   // "gutter", "class", "widget"
michael@0:   function regLineChange(cm, line, type) {
michael@0:     cm.curOp.viewChanged = true;
michael@0:     var display = cm.display, ext = cm.display.externalMeasured;
michael@0:     if (ext && line >= ext.lineN && line < ext.lineN + ext.size)
michael@0:       display.externalMeasured = null;
michael@0: 
michael@0:     if (line < display.viewFrom || line >= display.viewTo) return;
michael@0:     var lineView = display.view[findViewIndex(cm, line)];
michael@0:     if (lineView.node == null) return;
michael@0:     var arr = lineView.changes || (lineView.changes = []);
michael@0:     if (indexOf(arr, type) == -1) arr.push(type);
michael@0:   }
michael@0: 
michael@0:   // Clear the view.
michael@0:   function resetView(cm) {
michael@0:     cm.display.viewFrom = cm.display.viewTo = cm.doc.first;
michael@0:     cm.display.view = [];
michael@0:     cm.display.viewOffset = 0;
michael@0:   }
michael@0: 
michael@0:   // Find the view element corresponding to a given line. Return null
michael@0:   // when the line isn't visible.
michael@0:   function findViewIndex(cm, n) {
michael@0:     if (n >= cm.display.viewTo) return null;
michael@0:     n -= cm.display.viewFrom;
michael@0:     if (n < 0) return null;
michael@0:     var view = cm.display.view;
michael@0:     for (var i = 0; i < view.length; i++) {
michael@0:       n -= view[i].size;
michael@0:       if (n < 0) return i;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function viewCuttingPoint(cm, oldN, newN, dir) {
michael@0:     var index = findViewIndex(cm, oldN), diff, view = cm.display.view;
michael@0:     if (!sawCollapsedSpans) return {index: index, lineN: newN};
michael@0:     for (var i = 0, n = cm.display.viewFrom; i < index; i++)
michael@0:       n += view[i].size;
michael@0:     if (n != oldN) {
michael@0:       if (dir > 0) {
michael@0:         if (index == view.length - 1) return null;
michael@0:         diff = (n + view[index].size) - oldN;
michael@0:         index++;
michael@0:       } else {
michael@0:         diff = n - oldN;
michael@0:       }
michael@0:       oldN += diff; newN += diff;
michael@0:     }
michael@0:     while (visualLineNo(cm.doc, newN) != newN) {
michael@0:       if (index == (dir < 0 ? 0 : view.length - 1)) return null;
michael@0:       newN += dir * view[index - (dir < 0 ? 1 : 0)].size;
michael@0:       index += dir;
michael@0:     }
michael@0:     return {index: index, lineN: newN};
michael@0:   }
michael@0: 
michael@0:   // Force the view to cover a given range, adding empty view element
michael@0:   // or clipping off existing ones as needed.
michael@0:   function adjustView(cm, from, to) {
michael@0:     var display = cm.display, view = display.view;
michael@0:     if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
michael@0:       display.view = buildViewArray(cm, from, to);
michael@0:       display.viewFrom = from;
michael@0:     } else {
michael@0:       if (display.viewFrom > from)
michael@0:         display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view);
michael@0:       else if (display.viewFrom < from)
michael@0:         display.view = display.view.slice(findViewIndex(cm, from));
michael@0:       display.viewFrom = from;
michael@0:       if (display.viewTo < to)
michael@0:         display.view = display.view.concat(buildViewArray(cm, display.viewTo, to));
michael@0:       else if (display.viewTo > to)
michael@0:         display.view = display.view.slice(0, findViewIndex(cm, to));
michael@0:     }
michael@0:     display.viewTo = to;
michael@0:   }
michael@0: 
michael@0:   // Count the number of lines in the view whose DOM representation is
michael@0:   // out of date (or nonexistent).
michael@0:   function countDirtyView(cm) {
michael@0:     var view = cm.display.view, dirty = 0;
michael@0:     for (var i = 0; i < view.length; i++) {
michael@0:       var lineView = view[i];
michael@0:       if (!lineView.hidden && (!lineView.node || lineView.changes)) ++dirty;
michael@0:     }
michael@0:     return dirty;
michael@0:   }
michael@0: 
michael@0:   // INPUT HANDLING
michael@0: 
michael@0:   // Poll for input changes, using the normal rate of polling. This
michael@0:   // runs as long as the editor is focused.
michael@0:   function slowPoll(cm) {
michael@0:     if (cm.display.pollingFast) return;
michael@0:     cm.display.poll.set(cm.options.pollInterval, function() {
michael@0:       readInput(cm);
michael@0:       if (cm.state.focused) slowPoll(cm);
michael@0:     });
michael@0:   }
michael@0: 
michael@0:   // When an event has just come in that is likely to add or change
michael@0:   // something in the input textarea, we poll faster, to ensure that
michael@0:   // the change appears on the screen quickly.
michael@0:   function fastPoll(cm) {
michael@0:     var missed = false;
michael@0:     cm.display.pollingFast = true;
michael@0:     function p() {
michael@0:       var changed = readInput(cm);
michael@0:       if (!changed && !missed) {missed = true; cm.display.poll.set(60, p);}
michael@0:       else {cm.display.pollingFast = false; slowPoll(cm);}
michael@0:     }
michael@0:     cm.display.poll.set(20, p);
michael@0:   }
michael@0: 
michael@0:   // Read input from the textarea, and update the document to match.
michael@0:   // When something is selected, it is present in the textarea, and
michael@0:   // selected (unless it is huge, in which case a placeholder is
michael@0:   // used). When nothing is selected, the cursor sits after previously
michael@0:   // seen text (can be empty), which is stored in prevInput (we must
michael@0:   // not reset the textarea when typing, because that breaks IME).
michael@0:   function readInput(cm) {
michael@0:     var input = cm.display.input, prevInput = cm.display.prevInput, doc = cm.doc;
michael@0:     // Since this is called a *lot*, try to bail out as cheaply as
michael@0:     // possible when it is clear that nothing happened. hasSelection
michael@0:     // will be the case when there is a lot of text in the textarea,
michael@0:     // in which case reading its value would be expensive.
michael@0:     if (!cm.state.focused || hasSelection(input) || isReadOnly(cm) || cm.options.disableInput) return false;
michael@0:     var text = input.value;
michael@0:     // If nothing changed, bail.
michael@0:     if (text == prevInput && !cm.somethingSelected()) return false;
michael@0:     // Work around nonsensical selection resetting in IE9/10
michael@0:     if (ie && !ie_upto8 && cm.display.inputHasSelection === text) {
michael@0:       resetInput(cm);
michael@0:       return false;
michael@0:     }
michael@0: 
michael@0:     var withOp = !cm.curOp;
michael@0:     if (withOp) startOperation(cm);
michael@0:     cm.display.shift = false;
michael@0: 
michael@0:     // Find the part of the input that is actually new
michael@0:     var same = 0, l = Math.min(prevInput.length, text.length);
michael@0:     while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) ++same;
michael@0:     var inserted = text.slice(same), textLines = splitLines(inserted);
michael@0: 
michael@0:     // When pasing N lines into N selections, insert one line per selection
michael@0:     var multiPaste = cm.state.pasteIncoming && textLines.length > 1 && doc.sel.ranges.length == textLines.length;
michael@0: 
michael@0:     // Normal behavior is to insert the new text into every selection
michael@0:     for (var i = doc.sel.ranges.length - 1; i >= 0; i--) {
michael@0:       var range = doc.sel.ranges[i];
michael@0:       var from = range.from(), to = range.to();
michael@0:       // Handle deletion
michael@0:       if (same < prevInput.length)
michael@0:         from = Pos(from.line, from.ch - (prevInput.length - same));
michael@0:       // Handle overwrite
michael@0:       else if (cm.state.overwrite && range.empty() && !cm.state.pasteIncoming)
michael@0:         to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length));
michael@0:       var updateInput = cm.curOp.updateInput;
michael@0:       var changeEvent = {from: from, to: to, text: multiPaste ? [textLines[i]] : textLines,
michael@0:                          origin: cm.state.pasteIncoming ? "paste" : cm.state.cutIncoming ? "cut" : "+input"};
michael@0:       makeChange(cm.doc, changeEvent);
michael@0:       signalLater(cm, "inputRead", cm, changeEvent);
michael@0:       // When an 'electric' character is inserted, immediately trigger a reindent
michael@0:       if (inserted && !cm.state.pasteIncoming && cm.options.electricChars &&
michael@0:           cm.options.smartIndent && range.head.ch < 100 &&
michael@0:           (!i || doc.sel.ranges[i - 1].head.line != range.head.line)) {
michael@0:         var electric = cm.getModeAt(range.head).electricChars;
michael@0:         if (electric) for (var j = 0; j < electric.length; j++)
michael@0:           if (inserted.indexOf(electric.charAt(j)) > -1) {
michael@0:             indentLine(cm, range.head.line, "smart");
michael@0:             break;
michael@0:           }
michael@0:       }
michael@0:     }
michael@0:     ensureCursorVisible(cm);
michael@0:     cm.curOp.updateInput = updateInput;
michael@0:     cm.curOp.typing = true;
michael@0: 
michael@0:     // Don't leave long text in the textarea, since it makes further polling slow
michael@0:     if (text.length > 1000 || text.indexOf("\n") > -1) input.value = cm.display.prevInput = "";
michael@0:     else cm.display.prevInput = text;
michael@0:     if (withOp) endOperation(cm);
michael@0:     cm.state.pasteIncoming = cm.state.cutIncoming = false;
michael@0:     return true;
michael@0:   }
michael@0: 
michael@0:   // Reset the input to correspond to the selection (or to be empty,
michael@0:   // when not typing and nothing is selected)
michael@0:   function resetInput(cm, typing) {
michael@0:     var minimal, selected, doc = cm.doc;
michael@0:     if (cm.somethingSelected()) {
michael@0:       cm.display.prevInput = "";
michael@0:       var range = doc.sel.primary();
michael@0:       minimal = hasCopyEvent &&
michael@0:         (range.to().line - range.from().line > 100 || (selected = cm.getSelection()).length > 1000);
michael@0:       var content = minimal ? "-" : selected || cm.getSelection();
michael@0:       cm.display.input.value = content;
michael@0:       if (cm.state.focused) selectInput(cm.display.input);
michael@0:       if (ie && !ie_upto8) cm.display.inputHasSelection = content;
michael@0:     } else if (!typing) {
michael@0:       cm.display.prevInput = cm.display.input.value = "";
michael@0:       if (ie && !ie_upto8) cm.display.inputHasSelection = null;
michael@0:     }
michael@0:     cm.display.inaccurateSelection = minimal;
michael@0:   }
michael@0: 
michael@0:   function focusInput(cm) {
michael@0:     if (cm.options.readOnly != "nocursor" && (!mobile || activeElt() != cm.display.input))
michael@0:       cm.display.input.focus();
michael@0:   }
michael@0: 
michael@0:   function ensureFocus(cm) {
michael@0:     if (!cm.state.focused) { focusInput(cm); onFocus(cm); }
michael@0:   }
michael@0: 
michael@0:   function isReadOnly(cm) {
michael@0:     return cm.options.readOnly || cm.doc.cantEdit;
michael@0:   }
michael@0: 
michael@0:   // EVENT HANDLERS
michael@0: 
michael@0:   // Attach the necessary event handlers when initializing the editor
michael@0:   function registerEventHandlers(cm) {
michael@0:     var d = cm.display;
michael@0:     on(d.scroller, "mousedown", operation(cm, onMouseDown));
michael@0:     // Older IE's will not fire a second mousedown for a double click
michael@0:     if (ie_upto10)
michael@0:       on(d.scroller, "dblclick", operation(cm, function(e) {
michael@0:         if (signalDOMEvent(cm, e)) return;
michael@0:         var pos = posFromMouse(cm, e);
michael@0:         if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) return;
michael@0:         e_preventDefault(e);
michael@0:         var word = findWordAt(cm.doc, pos);
michael@0:         extendSelection(cm.doc, word.anchor, word.head);
michael@0:       }));
michael@0:     else
michael@0:       on(d.scroller, "dblclick", function(e) { signalDOMEvent(cm, e) || e_preventDefault(e); });
michael@0:     // Prevent normal selection in the editor (we handle our own)
michael@0:     on(d.lineSpace, "selectstart", function(e) {
michael@0:       if (!eventInWidget(d, e)) e_preventDefault(e);
michael@0:     });
michael@0:     // Some browsers fire contextmenu *after* opening the menu, at
michael@0:     // which point we can't mess with it anymore. Context menu is
michael@0:     // handled in onMouseDown for these browsers.
michael@0:     if (!captureRightClick) on(d.scroller, "contextmenu", function(e) {onContextMenu(cm, e);});
michael@0: 
michael@0:     // Sync scrolling between fake scrollbars and real scrollable
michael@0:     // area, ensure viewport is updated when scrolling.
michael@0:     on(d.scroller, "scroll", function() {
michael@0:       if (d.scroller.clientHeight) {
michael@0:         setScrollTop(cm, d.scroller.scrollTop);
michael@0:         setScrollLeft(cm, d.scroller.scrollLeft, true);
michael@0:         signal(cm, "scroll", cm);
michael@0:       }
michael@0:     });
michael@0:     on(d.scrollbarV, "scroll", function() {
michael@0:       if (d.scroller.clientHeight) setScrollTop(cm, d.scrollbarV.scrollTop);
michael@0:     });
michael@0:     on(d.scrollbarH, "scroll", function() {
michael@0:       if (d.scroller.clientHeight) setScrollLeft(cm, d.scrollbarH.scrollLeft);
michael@0:     });
michael@0: 
michael@0:     // Listen to wheel events in order to try and update the viewport on time.
michael@0:     on(d.scroller, "mousewheel", function(e){onScrollWheel(cm, e);});
michael@0:     on(d.scroller, "DOMMouseScroll", function(e){onScrollWheel(cm, e);});
michael@0: 
michael@0:     // Prevent clicks in the scrollbars from killing focus
michael@0:     function reFocus() { if (cm.state.focused) setTimeout(bind(focusInput, cm), 0); }
michael@0:     on(d.scrollbarH, "mousedown", reFocus);
michael@0:     on(d.scrollbarV, "mousedown", reFocus);
michael@0:     // Prevent wrapper from ever scrolling
michael@0:     on(d.wrapper, "scroll", function() { d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });
michael@0: 
michael@0:     // When the window resizes, we need to refresh active editors.
michael@0:     var resizeTimer;
michael@0:     function onResize() {
michael@0:       if (resizeTimer == null) resizeTimer = setTimeout(function() {
michael@0:         resizeTimer = null;
michael@0:         // Might be a text scaling operation, clear size caches.
michael@0:         d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = knownScrollbarWidth = null;
michael@0:         cm.setSize();
michael@0:       }, 100);
michael@0:     }
michael@0:     on(window, "resize", onResize);
michael@0:     // The above handler holds on to the editor and its data
michael@0:     // structures. Here we poll to unregister it when the editor is no
michael@0:     // longer in the document, so that it can be garbage-collected.
michael@0:     function unregister() {
michael@0:       if (contains(document.body, d.wrapper)) setTimeout(unregister, 5000);
michael@0:       else off(window, "resize", onResize);
michael@0:     }
michael@0:     setTimeout(unregister, 5000);
michael@0: 
michael@0:     on(d.input, "keyup", operation(cm, onKeyUp));
michael@0:     on(d.input, "input", function() {
michael@0:       if (ie && !ie_upto8 && cm.display.inputHasSelection) cm.display.inputHasSelection = null;
michael@0:       fastPoll(cm);
michael@0:     });
michael@0:     on(d.input, "keydown", operation(cm, onKeyDown));
michael@0:     on(d.input, "keypress", operation(cm, onKeyPress));
michael@0:     on(d.input, "focus", bind(onFocus, cm));
michael@0:     on(d.input, "blur", bind(onBlur, cm));
michael@0: 
michael@0:     function drag_(e) {
michael@0:       if (!signalDOMEvent(cm, e)) e_stop(e);
michael@0:     }
michael@0:     if (cm.options.dragDrop) {
michael@0:       on(d.scroller, "dragstart", function(e){onDragStart(cm, e);});
michael@0:       on(d.scroller, "dragenter", drag_);
michael@0:       on(d.scroller, "dragover", drag_);
michael@0:       on(d.scroller, "drop", operation(cm, onDrop));
michael@0:     }
michael@0:     on(d.scroller, "paste", function(e) {
michael@0:       if (eventInWidget(d, e)) return;
michael@0:       cm.state.pasteIncoming = true;
michael@0:       focusInput(cm);
michael@0:       fastPoll(cm);
michael@0:     });
michael@0:     on(d.input, "paste", function() {
michael@0:       cm.state.pasteIncoming = true;
michael@0:       fastPoll(cm);
michael@0:     });
michael@0: 
michael@0:     function prepareCopy(e) {
michael@0:       if (d.inaccurateSelection) {
michael@0:         d.prevInput = "";
michael@0:         d.inaccurateSelection = false;
michael@0:         d.input.value = cm.getSelection();
michael@0:         selectInput(d.input);
michael@0:       }
michael@0:       if (e.type == "cut") cm.state.cutIncoming = true;
michael@0:     }
michael@0:     on(d.input, "cut", prepareCopy);
michael@0:     on(d.input, "copy", prepareCopy);
michael@0: 
michael@0:     // Needed to handle Tab key in KHTML
michael@0:     if (khtml) on(d.sizer, "mouseup", function() {
michael@0:       if (activeElt() == d.input) d.input.blur();
michael@0:       focusInput(cm);
michael@0:     });
michael@0:   }
michael@0: 
michael@0:   // MOUSE EVENTS
michael@0: 
michael@0:   // Return true when the given mouse event happened in a widget
michael@0:   function eventInWidget(display, e) {
michael@0:     for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
michael@0:       if (!n || n.ignoreEvents || n.parentNode == display.sizer && n != display.mover) return true;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Given a mouse event, find the corresponding position. If liberal
michael@0:   // is false, it checks whether a gutter or scrollbar was clicked,
michael@0:   // and returns null if it was. forRect is used by rectangular
michael@0:   // selections, and tries to estimate a character position even for
michael@0:   // coordinates beyond the right of the text.
michael@0:   function posFromMouse(cm, e, liberal, forRect) {
michael@0:     var display = cm.display;
michael@0:     if (!liberal) {
michael@0:       var target = e_target(e);
michael@0:       if (target == display.scrollbarH || target == display.scrollbarV ||
michael@0:           target == display.scrollbarFiller || target == display.gutterFiller) return null;
michael@0:     }
michael@0:     var x, y, space = display.lineSpace.getBoundingClientRect();
michael@0:     // Fails unpredictably on IE[67] when mouse is dragged around quickly.
michael@0:     try { x = e.clientX - space.left; y = e.clientY - space.top; }
michael@0:     catch (e) { return null; }
michael@0:     var coords = coordsChar(cm, x, y), line;
michael@0:     if (forRect && coords.xRel == 1 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
michael@0:       var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;
michael@0:       coords = Pos(coords.line, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff);
michael@0:     }
michael@0:     return coords;
michael@0:   }
michael@0: 
michael@0:   // A mouse down can be a single click, double click, triple click,
michael@0:   // start of selection drag, start of text drag, new cursor
michael@0:   // (ctrl-click), rectangle drag (alt-drag), or xwin
michael@0:   // middle-click-paste. Or it might be a click on something we should
michael@0:   // not interfere with, such as a scrollbar or widget.
michael@0:   function onMouseDown(e) {
michael@0:     if (signalDOMEvent(this, e)) return;
michael@0:     var cm = this, display = cm.display;
michael@0:     display.shift = e.shiftKey;
michael@0: 
michael@0:     if (eventInWidget(display, e)) {
michael@0:       if (!webkit) {
michael@0:         // Briefly turn off draggability, to allow widgets to do
michael@0:         // normal dragging things.
michael@0:         display.scroller.draggable = false;
michael@0:         setTimeout(function(){display.scroller.draggable = true;}, 100);
michael@0:       }
michael@0:       return;
michael@0:     }
michael@0:     if (clickInGutter(cm, e)) return;
michael@0:     var start = posFromMouse(cm, e);
michael@0:     window.focus();
michael@0: 
michael@0:     switch (e_button(e)) {
michael@0:     case 1:
michael@0:       if (start)
michael@0:         leftButtonDown(cm, e, start);
michael@0:       else if (e_target(e) == display.scroller)
michael@0:         e_preventDefault(e);
michael@0:       break;
michael@0:     case 2:
michael@0:       if (webkit) cm.state.lastMiddleDown = +new Date;
michael@0:       if (start) extendSelection(cm.doc, start);
michael@0:       setTimeout(bind(focusInput, cm), 20);
michael@0:       e_preventDefault(e);
michael@0:       break;
michael@0:     case 3:
michael@0:       if (captureRightClick) onContextMenu(cm, e);
michael@0:       break;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   var lastClick, lastDoubleClick;
michael@0:   function leftButtonDown(cm, e, start) {
michael@0:     setTimeout(bind(ensureFocus, cm), 0);
michael@0: 
michael@0:     var now = +new Date, type;
michael@0:     if (lastDoubleClick && lastDoubleClick.time > now - 400 && cmp(lastDoubleClick.pos, start) == 0) {
michael@0:       type = "triple";
michael@0:     } else if (lastClick && lastClick.time > now - 400 && cmp(lastClick.pos, start) == 0) {
michael@0:       type = "double";
michael@0:       lastDoubleClick = {time: now, pos: start};
michael@0:     } else {
michael@0:       type = "single";
michael@0:       lastClick = {time: now, pos: start};
michael@0:     }
michael@0: 
michael@0:     var sel = cm.doc.sel, addNew = mac ? e.metaKey : e.ctrlKey;
michael@0:     if (cm.options.dragDrop && dragAndDrop && !addNew && !isReadOnly(cm) &&
michael@0:         type == "single" && sel.contains(start) > -1 && sel.somethingSelected())
michael@0:       leftButtonStartDrag(cm, e, start);
michael@0:     else
michael@0:       leftButtonSelect(cm, e, start, type, addNew);
michael@0:   }
michael@0: 
michael@0:   // Start a text drag. When it ends, see if any dragging actually
michael@0:   // happen, and treat as a click if it didn't.
michael@0:   function leftButtonStartDrag(cm, e, start) {
michael@0:     var display = cm.display;
michael@0:     var dragEnd = operation(cm, function(e2) {
michael@0:       if (webkit) display.scroller.draggable = false;
michael@0:       cm.state.draggingText = false;
michael@0:       off(document, "mouseup", dragEnd);
michael@0:       off(display.scroller, "drop", dragEnd);
michael@0:       if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
michael@0:         e_preventDefault(e2);
michael@0:         extendSelection(cm.doc, start);
michael@0:         focusInput(cm);
michael@0:         // Work around unexplainable focus problem in IE9 (#2127)
michael@0:         if (ie_upto10 && !ie_upto8)
michael@0:           setTimeout(function() {document.body.focus(); focusInput(cm);}, 20);
michael@0:       }
michael@0:     });
michael@0:     // Let the drag handler handle this.
michael@0:     if (webkit) display.scroller.draggable = true;
michael@0:     cm.state.draggingText = dragEnd;
michael@0:     // IE's approach to draggable
michael@0:     if (display.scroller.dragDrop) display.scroller.dragDrop();
michael@0:     on(document, "mouseup", dragEnd);
michael@0:     on(display.scroller, "drop", dragEnd);
michael@0:   }
michael@0: 
michael@0:   // Normal selection, as opposed to text dragging.
michael@0:   function leftButtonSelect(cm, e, start, type, addNew) {
michael@0:     var display = cm.display, doc = cm.doc;
michael@0:     e_preventDefault(e);
michael@0: 
michael@0:     var ourRange, ourIndex, startSel = doc.sel;
michael@0:     if (addNew) {
michael@0:       ourIndex = doc.sel.contains(start);
michael@0:       if (ourIndex > -1)
michael@0:         ourRange = doc.sel.ranges[ourIndex];
michael@0:       else
michael@0:         ourRange = new Range(start, start);
michael@0:     } else {
michael@0:       ourRange = doc.sel.primary();
michael@0:     }
michael@0: 
michael@0:     if (e.altKey) {
michael@0:       type = "rect";
michael@0:       if (!addNew) ourRange = new Range(start, start);
michael@0:       start = posFromMouse(cm, e, true, true);
michael@0:       ourIndex = -1;
michael@0:     } else if (type == "double") {
michael@0:       var word = findWordAt(doc, start);
michael@0:       if (cm.display.shift || doc.extend)
michael@0:         ourRange = extendRange(doc, ourRange, word.anchor, word.head);
michael@0:       else
michael@0:         ourRange = word;
michael@0:     } else if (type == "triple") {
michael@0:       var line = new Range(Pos(start.line, 0), clipPos(doc, Pos(start.line + 1, 0)));
michael@0:       if (cm.display.shift || doc.extend)
michael@0:         ourRange = extendRange(doc, ourRange, line.anchor, line.head);
michael@0:       else
michael@0:         ourRange = line;
michael@0:     } else {
michael@0:       ourRange = extendRange(doc, ourRange, start);
michael@0:     }
michael@0: 
michael@0:     if (!addNew) {
michael@0:       ourIndex = 0;
michael@0:       setSelection(doc, new Selection([ourRange], 0), sel_mouse);
michael@0:     } else if (ourIndex > -1) {
michael@0:       replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);
michael@0:     } else {
michael@0:       ourIndex = doc.sel.ranges.length;
michael@0:       setSelection(doc, normalizeSelection(doc.sel.ranges.concat([ourRange]), ourIndex),
michael@0:                    {scroll: false, origin: "*mouse"});
michael@0:     }
michael@0: 
michael@0:     var lastPos = start;
michael@0:     function extendTo(pos) {
michael@0:       if (cmp(lastPos, pos) == 0) return;
michael@0:       lastPos = pos;
michael@0: 
michael@0:       if (type == "rect") {
michael@0:         var ranges = [], tabSize = cm.options.tabSize;
michael@0:         var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize);
michael@0:         var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);
michael@0:         var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol);
michael@0:         for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));
michael@0:              line <= end; line++) {
michael@0:           var text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize);
michael@0:           if (left == right)
michael@0:             ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos)));
michael@0:           else if (text.length > leftPos)
michael@0:             ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize))));
michael@0:         }
michael@0:         if (!ranges.length) ranges.push(new Range(start, start));
michael@0:         setSelection(doc, normalizeSelection(startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex), sel_mouse);
michael@0:       } else {
michael@0:         var oldRange = ourRange;
michael@0:         var anchor = oldRange.anchor, head = pos;
michael@0:         if (type != "single") {
michael@0:           if (type == "double")
michael@0:             var range = findWordAt(doc, pos);
michael@0:           else
michael@0:             var range = new Range(Pos(pos.line, 0), clipPos(doc, Pos(pos.line + 1, 0)));
michael@0:           if (cmp(range.anchor, anchor) > 0) {
michael@0:             head = range.head;
michael@0:             anchor = minPos(oldRange.from(), range.anchor);
michael@0:           } else {
michael@0:             head = range.anchor;
michael@0:             anchor = maxPos(oldRange.to(), range.head);
michael@0:           }
michael@0:         }
michael@0:         var ranges = startSel.ranges.slice(0);
michael@0:         ranges[ourIndex] = new Range(clipPos(doc, anchor), head);
michael@0:         setSelection(doc, normalizeSelection(ranges, ourIndex), sel_mouse);
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     var editorSize = display.wrapper.getBoundingClientRect();
michael@0:     // Used to ensure timeout re-tries don't fire when another extend
michael@0:     // happened in the meantime (clearTimeout isn't reliable -- at
michael@0:     // least on Chrome, the timeouts still happen even when cleared,
michael@0:     // if the clear happens after their scheduled firing time).
michael@0:     var counter = 0;
michael@0: 
michael@0:     function extend(e) {
michael@0:       var curCount = ++counter;
michael@0:       var cur = posFromMouse(cm, e, true, type == "rect");
michael@0:       if (!cur) return;
michael@0:       if (cmp(cur, lastPos) != 0) {
michael@0:         ensureFocus(cm);
michael@0:         extendTo(cur);
michael@0:         var visible = visibleLines(display, doc);
michael@0:         if (cur.line >= visible.to || cur.line < visible.from)
michael@0:           setTimeout(operation(cm, function(){if (counter == curCount) extend(e);}), 150);
michael@0:       } else {
michael@0:         var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
michael@0:         if (outside) setTimeout(operation(cm, function() {
michael@0:           if (counter != curCount) return;
michael@0:           display.scroller.scrollTop += outside;
michael@0:           extend(e);
michael@0:         }), 50);
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     function done(e) {
michael@0:       counter = Infinity;
michael@0:       e_preventDefault(e);
michael@0:       focusInput(cm);
michael@0:       off(document, "mousemove", move);
michael@0:       off(document, "mouseup", up);
michael@0:       doc.history.lastSelOrigin = null;
michael@0:     }
michael@0: 
michael@0:     var move = operation(cm, function(e) {
michael@0:       if ((ie && !ie_upto9) ?  !e.buttons : !e_button(e)) done(e);
michael@0:       else extend(e);
michael@0:     });
michael@0:     var up = operation(cm, done);
michael@0:     on(document, "mousemove", move);
michael@0:     on(document, "mouseup", up);
michael@0:   }
michael@0: 
michael@0:   // Determines whether an event happened in the gutter, and fires the
michael@0:   // handlers for the corresponding event.
michael@0:   function gutterEvent(cm, e, type, prevent, signalfn) {
michael@0:     try { var mX = e.clientX, mY = e.clientY; }
michael@0:     catch(e) { return false; }
michael@0:     if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) return false;
michael@0:     if (prevent) e_preventDefault(e);
michael@0: 
michael@0:     var display = cm.display;
michael@0:     var lineBox = display.lineDiv.getBoundingClientRect();
michael@0: 
michael@0:     if (mY > lineBox.bottom || !hasHandler(cm, type)) return e_defaultPrevented(e);
michael@0:     mY -= lineBox.top - display.viewOffset;
michael@0: 
michael@0:     for (var i = 0; i < cm.options.gutters.length; ++i) {
michael@0:       var g = display.gutters.childNodes[i];
michael@0:       if (g && g.getBoundingClientRect().right >= mX) {
michael@0:         var line = lineAtHeight(cm.doc, mY);
michael@0:         var gutter = cm.options.gutters[i];
michael@0:         signalfn(cm, type, cm, line, gutter, e);
michael@0:         return e_defaultPrevented(e);
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function clickInGutter(cm, e) {
michael@0:     return gutterEvent(cm, e, "gutterClick", true, signalLater);
michael@0:   }
michael@0: 
michael@0:   // Kludge to work around strange IE behavior where it'll sometimes
michael@0:   // re-fire a series of drag-related events right after the drop (#1551)
michael@0:   var lastDrop = 0;
michael@0: 
michael@0:   function onDrop(e) {
michael@0:     var cm = this;
michael@0:     if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e))
michael@0:       return;
michael@0:     e_preventDefault(e);
michael@0:     if (ie_upto10) lastDrop = +new Date;
michael@0:     var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;
michael@0:     if (!pos || isReadOnly(cm)) return;
michael@0:     // Might be a file drop, in which case we simply extract the text
michael@0:     // and insert it.
michael@0:     if (files && files.length && window.FileReader && window.File) {
michael@0:       var n = files.length, text = Array(n), read = 0;
michael@0:       var loadFile = function(file, i) {
michael@0:         var reader = new FileReader;
michael@0:         reader.onload = function() {
michael@0:           text[i] = reader.result;
michael@0:           if (++read == n) {
michael@0:             pos = clipPos(cm.doc, pos);
michael@0:             var change = {from: pos, to: pos, text: splitLines(text.join("\n")), origin: "paste"};
michael@0:             makeChange(cm.doc, change);
michael@0:             setSelectionReplaceHistory(cm.doc, simpleSelection(pos, changeEnd(change)));
michael@0:           }
michael@0:         };
michael@0:         reader.readAsText(file);
michael@0:       };
michael@0:       for (var i = 0; i < n; ++i) loadFile(files[i], i);
michael@0:     } else { // Normal drop
michael@0:       // Don't do a replace if the drop happened inside of the selected text.
michael@0:       if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
michael@0:         cm.state.draggingText(e);
michael@0:         // Ensure the editor is re-focused
michael@0:         setTimeout(bind(focusInput, cm), 20);
michael@0:         return;
michael@0:       }
michael@0:       try {
michael@0:         var text = e.dataTransfer.getData("Text");
michael@0:         if (text) {
michael@0:           var selected = cm.state.draggingText && cm.listSelections();
michael@0:           setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
michael@0:           if (selected) for (var i = 0; i < selected.length; ++i)
michael@0:             replaceRange(cm.doc, "", selected[i].anchor, selected[i].head, "drag");
michael@0:           cm.replaceSelection(text, "around", "paste");
michael@0:           focusInput(cm);
michael@0:         }
michael@0:       }
michael@0:       catch(e){}
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function onDragStart(cm, e) {
michael@0:     if (ie_upto10 && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return; }
michael@0:     if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) return;
michael@0: 
michael@0:     e.dataTransfer.setData("Text", cm.getSelection());
michael@0: 
michael@0:     // Use dummy image instead of default browsers image.
michael@0:     // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
michael@0:     if (e.dataTransfer.setDragImage && !safari) {
michael@0:       var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
michael@0:       img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
michael@0:       if (presto) {
michael@0:         img.width = img.height = 1;
michael@0:         cm.display.wrapper.appendChild(img);
michael@0:         // Force a relayout, or Opera won't use our image for some obscure reason
michael@0:         img._top = img.offsetTop;
michael@0:       }
michael@0:       e.dataTransfer.setDragImage(img, 0, 0);
michael@0:       if (presto) img.parentNode.removeChild(img);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // SCROLL EVENTS
michael@0: 
michael@0:   // Sync the scrollable area and scrollbars, ensure the viewport
michael@0:   // covers the visible area.
michael@0:   function setScrollTop(cm, val) {
michael@0:     if (Math.abs(cm.doc.scrollTop - val) < 2) return;
michael@0:     cm.doc.scrollTop = val;
michael@0:     if (!gecko) updateDisplay(cm, {top: val});
michael@0:     if (cm.display.scroller.scrollTop != val) cm.display.scroller.scrollTop = val;
michael@0:     if (cm.display.scrollbarV.scrollTop != val) cm.display.scrollbarV.scrollTop = val;
michael@0:     if (gecko) updateDisplay(cm);
michael@0:     startWorker(cm, 100);
michael@0:   }
michael@0:   // Sync scroller and scrollbar, ensure the gutter elements are
michael@0:   // aligned.
michael@0:   function setScrollLeft(cm, val, isScroller) {
michael@0:     if (isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) return;
michael@0:     val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth);
michael@0:     cm.doc.scrollLeft = val;
michael@0:     alignHorizontally(cm);
michael@0:     if (cm.display.scroller.scrollLeft != val) cm.display.scroller.scrollLeft = val;
michael@0:     if (cm.display.scrollbarH.scrollLeft != val) cm.display.scrollbarH.scrollLeft = val;
michael@0:   }
michael@0: 
michael@0:   // Since the delta values reported on mouse wheel events are
michael@0:   // unstandardized between browsers and even browser versions, and
michael@0:   // generally horribly unpredictable, this code starts by measuring
michael@0:   // the scroll effect that the first few mouse wheel events have,
michael@0:   // and, from that, detects the way it can convert deltas to pixel
michael@0:   // offsets afterwards.
michael@0:   //
michael@0:   // The reason we want to know the amount a wheel event will scroll
michael@0:   // is that it gives us a chance to update the display before the
michael@0:   // actual scrolling happens, reducing flickering.
michael@0: 
michael@0:   var wheelSamples = 0, wheelPixelsPerUnit = null;
michael@0:   // Fill in a browser-detected starting value on browsers where we
michael@0:   // know one. These don't have to be accurate -- the result of them
michael@0:   // being wrong would just be a slight flicker on the first wheel
michael@0:   // scroll (if it is large enough).
michael@0:   if (ie) wheelPixelsPerUnit = -.53;
michael@0:   else if (gecko) wheelPixelsPerUnit = 15;
michael@0:   else if (chrome) wheelPixelsPerUnit = -.7;
michael@0:   else if (safari) wheelPixelsPerUnit = -1/3;
michael@0: 
michael@0:   function onScrollWheel(cm, e) {
michael@0:     var dx = e.wheelDeltaX, dy = e.wheelDeltaY;
michael@0:     if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) dx = e.detail;
michael@0:     if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) dy = e.detail;
michael@0:     else if (dy == null) dy = e.wheelDelta;
michael@0: 
michael@0:     var display = cm.display, scroll = display.scroller;
michael@0:     // Quit if there's nothing to scroll here
michael@0:     if (!(dx && scroll.scrollWidth > scroll.clientWidth ||
michael@0:           dy && scroll.scrollHeight > scroll.clientHeight)) return;
michael@0: 
michael@0:     // Webkit browsers on OS X abort momentum scrolls when the target
michael@0:     // of the scroll event is removed from the scrollable element.
michael@0:     // This hack (see related code in patchDisplay) makes sure the
michael@0:     // element is kept around.
michael@0:     if (dy && mac && webkit) {
michael@0:       outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
michael@0:         for (var i = 0; i < view.length; i++) {
michael@0:           if (view[i].node == cur) {
michael@0:             cm.display.currentWheelTarget = cur;
michael@0:             break outer;
michael@0:           }
michael@0:         }
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     // On some browsers, horizontal scrolling will cause redraws to
michael@0:     // happen before the gutter has been realigned, causing it to
michael@0:     // wriggle around in a most unseemly way. When we have an
michael@0:     // estimated pixels/delta value, we just handle horizontal
michael@0:     // scrolling entirely here. It'll be slightly off from native, but
michael@0:     // better than glitching out.
michael@0:     if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {
michael@0:       if (dy)
michael@0:         setScrollTop(cm, Math.max(0, Math.min(scroll.scrollTop + dy * wheelPixelsPerUnit, scroll.scrollHeight - scroll.clientHeight)));
michael@0:       setScrollLeft(cm, Math.max(0, Math.min(scroll.scrollLeft + dx * wheelPixelsPerUnit, scroll.scrollWidth - scroll.clientWidth)));
michael@0:       e_preventDefault(e);
michael@0:       display.wheelStartX = null; // Abort measurement, if in progress
michael@0:       return;
michael@0:     }
michael@0: 
michael@0:     // 'Project' the visible viewport to cover the area that is being
michael@0:     // scrolled into view (if we know enough to estimate it).
michael@0:     if (dy && wheelPixelsPerUnit != null) {
michael@0:       var pixels = dy * wheelPixelsPerUnit;
michael@0:       var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;
michael@0:       if (pixels < 0) top = Math.max(0, top + pixels - 50);
michael@0:       else bot = Math.min(cm.doc.height, bot + pixels + 50);
michael@0:       updateDisplay(cm, {top: top, bottom: bot});
michael@0:     }
michael@0: 
michael@0:     if (wheelSamples < 20) {
michael@0:       if (display.wheelStartX == null) {
michael@0:         display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop;
michael@0:         display.wheelDX = dx; display.wheelDY = dy;
michael@0:         setTimeout(function() {
michael@0:           if (display.wheelStartX == null) return;
michael@0:           var movedX = scroll.scrollLeft - display.wheelStartX;
michael@0:           var movedY = scroll.scrollTop - display.wheelStartY;
michael@0:           var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
michael@0:             (movedX && display.wheelDX && movedX / display.wheelDX);
michael@0:           display.wheelStartX = display.wheelStartY = null;
michael@0:           if (!sample) return;
michael@0:           wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
michael@0:           ++wheelSamples;
michael@0:         }, 200);
michael@0:       } else {
michael@0:         display.wheelDX += dx; display.wheelDY += dy;
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // KEY EVENTS
michael@0: 
michael@0:   // Run a handler that was bound to a key.
michael@0:   function doHandleBinding(cm, bound, dropShift) {
michael@0:     if (typeof bound == "string") {
michael@0:       bound = commands[bound];
michael@0:       if (!bound) return false;
michael@0:     }
michael@0:     // Ensure previous input has been read, so that the handler sees a
michael@0:     // consistent view of the document
michael@0:     if (cm.display.pollingFast && readInput(cm)) cm.display.pollingFast = false;
michael@0:     var prevShift = cm.display.shift, done = false;
michael@0:     try {
michael@0:       if (isReadOnly(cm)) cm.state.suppressEdits = true;
michael@0:       if (dropShift) cm.display.shift = false;
michael@0:       done = bound(cm) != Pass;
michael@0:     } finally {
michael@0:       cm.display.shift = prevShift;
michael@0:       cm.state.suppressEdits = false;
michael@0:     }
michael@0:     return done;
michael@0:   }
michael@0: 
michael@0:   // Collect the currently active keymaps.
michael@0:   function allKeyMaps(cm) {
michael@0:     var maps = cm.state.keyMaps.slice(0);
michael@0:     if (cm.options.extraKeys) maps.push(cm.options.extraKeys);
michael@0:     maps.push(cm.options.keyMap);
michael@0:     return maps;
michael@0:   }
michael@0: 
michael@0:   var maybeTransition;
michael@0:   // Handle a key from the keydown event.
michael@0:   function handleKeyBinding(cm, e) {
michael@0:     // Handle automatic keymap transitions
michael@0:     var startMap = getKeyMap(cm.options.keyMap), next = startMap.auto;
michael@0:     clearTimeout(maybeTransition);
michael@0:     if (next && !isModifierKey(e)) maybeTransition = setTimeout(function() {
michael@0:       if (getKeyMap(cm.options.keyMap) == startMap) {
michael@0:         cm.options.keyMap = (next.call ? next.call(null, cm) : next);
michael@0:         keyMapChanged(cm);
michael@0:       }
michael@0:     }, 50);
michael@0: 
michael@0:     var name = keyName(e, true), handled = false;
michael@0:     if (!name) return false;
michael@0:     var keymaps = allKeyMaps(cm);
michael@0: 
michael@0:     if (e.shiftKey) {
michael@0:       // First try to resolve full name (including 'Shift-'). Failing
michael@0:       // that, see if there is a cursor-motion command (starting with
michael@0:       // 'go') bound to the keyname without 'Shift-'.
michael@0:       handled = lookupKey("Shift-" + name, keymaps, function(b) {return doHandleBinding(cm, b, true);})
michael@0:              || lookupKey(name, keymaps, function(b) {
michael@0:                   if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion)
michael@0:                     return doHandleBinding(cm, b);
michael@0:                 });
michael@0:     } else {
michael@0:       handled = lookupKey(name, keymaps, function(b) { return doHandleBinding(cm, b); });
michael@0:     }
michael@0: 
michael@0:     if (handled) {
michael@0:       e_preventDefault(e);
michael@0:       restartBlink(cm);
michael@0:       signalLater(cm, "keyHandled", cm, name, e);
michael@0:     }
michael@0:     return handled;
michael@0:   }
michael@0: 
michael@0:   // Handle a key from the keypress event
michael@0:   function handleCharBinding(cm, e, ch) {
michael@0:     var handled = lookupKey("'" + ch + "'", allKeyMaps(cm),
michael@0:                             function(b) { return doHandleBinding(cm, b, true); });
michael@0:     if (handled) {
michael@0:       e_preventDefault(e);
michael@0:       restartBlink(cm);
michael@0:       signalLater(cm, "keyHandled", cm, "'" + ch + "'", e);
michael@0:     }
michael@0:     return handled;
michael@0:   }
michael@0: 
michael@0:   var lastStoppedKey = null;
michael@0:   function onKeyDown(e) {
michael@0:     var cm = this;
michael@0:     ensureFocus(cm);
michael@0:     if (signalDOMEvent(cm, e)) return;
michael@0:     // IE does strange things with escape.
michael@0:     if (ie_upto10 && e.keyCode == 27) e.returnValue = false;
michael@0:     var code = e.keyCode;
michael@0:     cm.display.shift = code == 16 || e.shiftKey;
michael@0:     var handled = handleKeyBinding(cm, e);
michael@0:     if (presto) {
michael@0:       lastStoppedKey = handled ? code : null;
michael@0:       // Opera has no cut event... we try to at least catch the key combo
michael@0:       if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))
michael@0:         cm.replaceSelection("", null, "cut");
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function onKeyUp(e) {
michael@0:     if (signalDOMEvent(this, e)) return;
michael@0:     if (e.keyCode == 16) this.doc.sel.shift = false;
michael@0:   }
michael@0: 
michael@0:   function onKeyPress(e) {
michael@0:     var cm = this;
michael@0:     if (signalDOMEvent(cm, e)) return;
michael@0:     var keyCode = e.keyCode, charCode = e.charCode;
michael@0:     if (presto && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return;}
michael@0:     if (((presto && (!e.which || e.which < 10)) || khtml) && handleKeyBinding(cm, e)) return;
michael@0:     var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
michael@0:     if (handleCharBinding(cm, e, ch)) return;
michael@0:     if (ie && !ie_upto8) cm.display.inputHasSelection = null;
michael@0:     fastPoll(cm);
michael@0:   }
michael@0: 
michael@0:   // FOCUS/BLUR EVENTS
michael@0: 
michael@0:   function onFocus(cm) {
michael@0:     if (cm.options.readOnly == "nocursor") return;
michael@0:     if (!cm.state.focused) {
michael@0:       signal(cm, "focus", cm);
michael@0:       cm.state.focused = true;
michael@0:       if (cm.display.wrapper.className.search(/\bCodeMirror-focused\b/) == -1)
michael@0:         cm.display.wrapper.className += " CodeMirror-focused";
michael@0:       if (!cm.curOp) {
michael@0:         resetInput(cm);
michael@0:         if (webkit) setTimeout(bind(resetInput, cm, true), 0); // Issue #1730
michael@0:       }
michael@0:     }
michael@0:     slowPoll(cm);
michael@0:     restartBlink(cm);
michael@0:   }
michael@0:   function onBlur(cm) {
michael@0:     if (cm.state.focused) {
michael@0:       signal(cm, "blur", cm);
michael@0:       cm.state.focused = false;
michael@0:       cm.display.wrapper.className = cm.display.wrapper.className.replace(" CodeMirror-focused", "");
michael@0:     }
michael@0:     clearInterval(cm.display.blinker);
michael@0:     setTimeout(function() {if (!cm.state.focused) cm.display.shift = false;}, 150);
michael@0:   }
michael@0: 
michael@0:   // CONTEXT MENU HANDLING
michael@0: 
michael@0:   var detectingSelectAll;
michael@0:   // To make the context menu work, we need to briefly unhide the
michael@0:   // textarea (making it as unobtrusive as possible) to let the
michael@0:   // right-click take effect on it.
michael@0:   function onContextMenu(cm, e) {
michael@0:     if (signalDOMEvent(cm, e, "contextmenu")) return;
michael@0:     var display = cm.display;
michael@0:     if (eventInWidget(display, e) || contextMenuInGutter(cm, e)) return;
michael@0: 
michael@0:     var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
michael@0:     if (!pos || presto) return; // Opera is difficult.
michael@0: 
michael@0:     // Reset the current text selection only if the click is done outside of the selection
michael@0:     // and 'resetSelectionOnContextMenu' option is true.
michael@0:     var reset = cm.options.resetSelectionOnContextMenu;
michael@0:     if (reset && cm.doc.sel.contains(pos) == -1)
michael@0:       operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll);
michael@0: 
michael@0:     var oldCSS = display.input.style.cssText;
michael@0:     display.inputDiv.style.position = "absolute";
michael@0:     display.input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
michael@0:       "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: " +
michael@0:       (ie ? "rgba(255, 255, 255, .05)" : "transparent") +
michael@0:       "; outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
michael@0:     focusInput(cm);
michael@0:     resetInput(cm);
michael@0:     // Adds "Select all" to context menu in FF
michael@0:     if (!cm.somethingSelected()) display.input.value = display.prevInput = " ";
michael@0: 
michael@0:     // Select-all will be greyed out if there's nothing to select, so
michael@0:     // this adds a zero-width space so that we can later check whether
michael@0:     // it got selected.
michael@0:     function prepareSelectAllHack() {
michael@0:       if (display.input.selectionStart != null) {
michael@0:         var extval = display.input.value = "\u200b" + (cm.somethingSelected() ? display.input.value : "");
michael@0:         display.prevInput = "\u200b";
michael@0:         display.input.selectionStart = 1; display.input.selectionEnd = extval.length;
michael@0:       }
michael@0:     }
michael@0:     function rehide() {
michael@0:       display.inputDiv.style.position = "relative";
michael@0:       display.input.style.cssText = oldCSS;
michael@0:       if (ie_upto8) display.scrollbarV.scrollTop = display.scroller.scrollTop = scrollPos;
michael@0:       slowPoll(cm);
michael@0: 
michael@0:       // Try to detect the user choosing select-all
michael@0:       if (display.input.selectionStart != null) {
michael@0:         if (!ie || ie_upto8) prepareSelectAllHack();
michael@0:         clearTimeout(detectingSelectAll);
michael@0:         var i = 0, poll = function(){
michael@0:           if (display.prevInput == "\u200b" && display.input.selectionStart == 0)
michael@0:             operation(cm, commands.selectAll)(cm);
michael@0:           else if (i++ < 10) detectingSelectAll = setTimeout(poll, 500);
michael@0:           else resetInput(cm);
michael@0:         };
michael@0:         detectingSelectAll = setTimeout(poll, 200);
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     if (ie && !ie_upto8) prepareSelectAllHack();
michael@0:     if (captureRightClick) {
michael@0:       e_stop(e);
michael@0:       var mouseup = function() {
michael@0:         off(window, "mouseup", mouseup);
michael@0:         setTimeout(rehide, 20);
michael@0:       };
michael@0:       on(window, "mouseup", mouseup);
michael@0:     } else {
michael@0:       setTimeout(rehide, 50);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function contextMenuInGutter(cm, e) {
michael@0:     if (!hasHandler(cm, "gutterContextMenu")) return false;
michael@0:     return gutterEvent(cm, e, "gutterContextMenu", false, signal);
michael@0:   }
michael@0: 
michael@0:   // UPDATING
michael@0: 
michael@0:   // Compute the position of the end of a change (its 'to' property
michael@0:   // refers to the pre-change end).
michael@0:   var changeEnd = CodeMirror.changeEnd = function(change) {
michael@0:     if (!change.text) return change.to;
michael@0:     return Pos(change.from.line + change.text.length - 1,
michael@0:                lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0));
michael@0:   };
michael@0: 
michael@0:   // Adjust a position to refer to the post-change position of the
michael@0:   // same text, or the end of the change if the change covers it.
michael@0:   function adjustForChange(pos, change) {
michael@0:     if (cmp(pos, change.from) < 0) return pos;
michael@0:     if (cmp(pos, change.to) <= 0) return changeEnd(change);
michael@0: 
michael@0:     var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;
michael@0:     if (pos.line == change.to.line) ch += changeEnd(change).ch - change.to.ch;
michael@0:     return Pos(line, ch);
michael@0:   }
michael@0: 
michael@0:   function computeSelAfterChange(doc, change) {
michael@0:     var out = [];
michael@0:     for (var i = 0; i < doc.sel.ranges.length; i++) {
michael@0:       var range = doc.sel.ranges[i];
michael@0:       out.push(new Range(adjustForChange(range.anchor, change),
michael@0:                          adjustForChange(range.head, change)));
michael@0:     }
michael@0:     return normalizeSelection(out, doc.sel.primIndex);
michael@0:   }
michael@0: 
michael@0:   function offsetPos(pos, old, nw) {
michael@0:     if (pos.line == old.line)
michael@0:       return Pos(nw.line, pos.ch - old.ch + nw.ch);
michael@0:     else
michael@0:       return Pos(nw.line + (pos.line - old.line), pos.ch);
michael@0:   }
michael@0: 
michael@0:   // Used by replaceSelections to allow moving the selection to the
michael@0:   // start or around the replaced test. Hint may be "start" or "around".
michael@0:   function computeReplacedSel(doc, changes, hint) {
michael@0:     var out = [];
michael@0:     var oldPrev = Pos(doc.first, 0), newPrev = oldPrev;
michael@0:     for (var i = 0; i < changes.length; i++) {
michael@0:       var change = changes[i];
michael@0:       var from = offsetPos(change.from, oldPrev, newPrev);
michael@0:       var to = offsetPos(changeEnd(change), oldPrev, newPrev);
michael@0:       oldPrev = change.to;
michael@0:       newPrev = to;
michael@0:       if (hint == "around") {
michael@0:         var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0;
michael@0:         out[i] = new Range(inv ? to : from, inv ? from : to);
michael@0:       } else {
michael@0:         out[i] = new Range(from, from);
michael@0:       }
michael@0:     }
michael@0:     return new Selection(out, doc.sel.primIndex);
michael@0:   }
michael@0: 
michael@0:   // Allow "beforeChange" event handlers to influence a change
michael@0:   function filterChange(doc, change, update) {
michael@0:     var obj = {
michael@0:       canceled: false,
michael@0:       from: change.from,
michael@0:       to: change.to,
michael@0:       text: change.text,
michael@0:       origin: change.origin,
michael@0:       cancel: function() { this.canceled = true; }
michael@0:     };
michael@0:     if (update) obj.update = function(from, to, text, origin) {
michael@0:       if (from) this.from = clipPos(doc, from);
michael@0:       if (to) this.to = clipPos(doc, to);
michael@0:       if (text) this.text = text;
michael@0:       if (origin !== undefined) this.origin = origin;
michael@0:     };
michael@0:     signal(doc, "beforeChange", doc, obj);
michael@0:     if (doc.cm) signal(doc.cm, "beforeChange", doc.cm, obj);
michael@0: 
michael@0:     if (obj.canceled) return null;
michael@0:     return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin};
michael@0:   }
michael@0: 
michael@0:   // Apply a change to a document, and add it to the document's
michael@0:   // history, and propagating it to all linked documents.
michael@0:   function makeChange(doc, change, ignoreReadOnly) {
michael@0:     if (doc.cm) {
michael@0:       if (!doc.cm.curOp) return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly);
michael@0:       if (doc.cm.state.suppressEdits) return;
michael@0:     }
michael@0: 
michael@0:     if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
michael@0:       change = filterChange(doc, change, true);
michael@0:       if (!change) return;
michael@0:     }
michael@0: 
michael@0:     // Possibly split or suppress the update based on the presence
michael@0:     // of read-only spans in its range.
michael@0:     var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
michael@0:     if (split) {
michael@0:       for (var i = split.length - 1; i >= 0; --i)
michael@0:         makeChangeInner(doc, {from: split[i].from, to: split[i].to, text: i ? [""] : change.text});
michael@0:     } else {
michael@0:       makeChangeInner(doc, change);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function makeChangeInner(doc, change) {
michael@0:     if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) return;
michael@0:     var selAfter = computeSelAfterChange(doc, change);
michael@0:     addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);
michael@0: 
michael@0:     makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
michael@0:     var rebased = [];
michael@0: 
michael@0:     linkedDocs(doc, function(doc, sharedHist) {
michael@0:       if (!sharedHist && indexOf(rebased, doc.history) == -1) {
michael@0:         rebaseHist(doc.history, change);
michael@0:         rebased.push(doc.history);
michael@0:       }
michael@0:       makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
michael@0:     });
michael@0:   }
michael@0: 
michael@0:   // Revert a change stored in a document's history.
michael@0:   function makeChangeFromHistory(doc, type, allowSelectionOnly) {
michael@0:     if (doc.cm && doc.cm.state.suppressEdits) return;
michael@0: 
michael@0:     var hist = doc.history, event, selAfter = doc.sel;
michael@0:     var source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done;
michael@0: 
michael@0:     // Verify that there is a useable event (so that ctrl-z won't
michael@0:     // needlessly clear selection events)
michael@0:     for (var i = 0; i < source.length; i++) {
michael@0:       event = source[i];
michael@0:       if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)
michael@0:         break;
michael@0:     }
michael@0:     if (i == source.length) return;
michael@0:     hist.lastOrigin = hist.lastSelOrigin = null;
michael@0: 
michael@0:     for (;;) {
michael@0:       event = source.pop();
michael@0:       if (event.ranges) {
michael@0:         pushSelectionToHistory(event, dest);
michael@0:         if (allowSelectionOnly && !event.equals(doc.sel)) {
michael@0:           setSelection(doc, event, {clearRedo: false});
michael@0:           return;
michael@0:         }
michael@0:         selAfter = event;
michael@0:       }
michael@0:       else break;
michael@0:     }
michael@0: 
michael@0:     // Build up a reverse change object to add to the opposite history
michael@0:     // stack (redo when undoing, and vice versa).
michael@0:     var antiChanges = [];
michael@0:     pushSelectionToHistory(selAfter, dest);
michael@0:     dest.push({changes: antiChanges, generation: hist.generation});
michael@0:     hist.generation = event.generation || ++hist.maxGeneration;
michael@0: 
michael@0:     var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");
michael@0: 
michael@0:     for (var i = event.changes.length - 1; i >= 0; --i) {
michael@0:       var change = event.changes[i];
michael@0:       change.origin = type;
michael@0:       if (filter && !filterChange(doc, change, false)) {
michael@0:         source.length = 0;
michael@0:         return;
michael@0:       }
michael@0: 
michael@0:       antiChanges.push(historyChangeFromChange(doc, change));
michael@0: 
michael@0:       var after = i ? computeSelAfterChange(doc, change, null) : lst(source);
michael@0:       makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
michael@0:       if (doc.cm) ensureCursorVisible(doc.cm);
michael@0:       var rebased = [];
michael@0: 
michael@0:       // Propagate to the linked documents
michael@0:       linkedDocs(doc, function(doc, sharedHist) {
michael@0:         if (!sharedHist && indexOf(rebased, doc.history) == -1) {
michael@0:           rebaseHist(doc.history, change);
michael@0:           rebased.push(doc.history);
michael@0:         }
michael@0:         makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
michael@0:       });
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Sub-views need their line numbers shifted when text is added
michael@0:   // above or below them in the parent document.
michael@0:   function shiftDoc(doc, distance) {
michael@0:     doc.first += distance;
michael@0:     doc.sel = new Selection(map(doc.sel.ranges, function(range) {
michael@0:       return new Range(Pos(range.anchor.line + distance, range.anchor.ch),
michael@0:                        Pos(range.head.line + distance, range.head.ch));
michael@0:     }), doc.sel.primIndex);
michael@0:     if (doc.cm) regChange(doc.cm, doc.first, doc.first - distance, distance);
michael@0:   }
michael@0: 
michael@0:   // More lower-level change function, handling only a single document
michael@0:   // (not linked ones).
michael@0:   function makeChangeSingleDoc(doc, change, selAfter, spans) {
michael@0:     if (doc.cm && !doc.cm.curOp)
michael@0:       return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans);
michael@0: 
michael@0:     if (change.to.line < doc.first) {
michael@0:       shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
michael@0:       return;
michael@0:     }
michael@0:     if (change.from.line > doc.lastLine()) return;
michael@0: 
michael@0:     // Clip the change to the size of this doc
michael@0:     if (change.from.line < doc.first) {
michael@0:       var shift = change.text.length - 1 - (doc.first - change.from.line);
michael@0:       shiftDoc(doc, shift);
michael@0:       change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
michael@0:                 text: [lst(change.text)], origin: change.origin};
michael@0:     }
michael@0:     var last = doc.lastLine();
michael@0:     if (change.to.line > last) {
michael@0:       change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),
michael@0:                 text: [change.text[0]], origin: change.origin};
michael@0:     }
michael@0: 
michael@0:     change.removed = getBetween(doc, change.from, change.to);
michael@0: 
michael@0:     if (!selAfter) selAfter = computeSelAfterChange(doc, change, null);
michael@0:     if (doc.cm) makeChangeSingleDocInEditor(doc.cm, change, spans);
michael@0:     else updateDoc(doc, change, spans);
michael@0:     setSelectionNoUndo(doc, selAfter, sel_dontScroll);
michael@0:   }
michael@0: 
michael@0:   // Handle the interaction of a change to a document with the editor
michael@0:   // that this document is part of.
michael@0:   function makeChangeSingleDocInEditor(cm, change, spans) {
michael@0:     var doc = cm.doc, display = cm.display, from = change.from, to = change.to;
michael@0: 
michael@0:     var recomputeMaxLength = false, checkWidthStart = from.line;
michael@0:     if (!cm.options.lineWrapping) {
michael@0:       checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));
michael@0:       doc.iter(checkWidthStart, to.line + 1, function(line) {
michael@0:         if (line == display.maxLine) {
michael@0:           recomputeMaxLength = true;
michael@0:           return true;
michael@0:         }
michael@0:       });
michael@0:     }
michael@0: 
michael@0:     if (doc.sel.contains(change.from, change.to) > -1)
michael@0:       cm.curOp.cursorActivity = true;
michael@0: 
michael@0:     updateDoc(doc, change, spans, estimateHeight(cm));
michael@0: 
michael@0:     if (!cm.options.lineWrapping) {
michael@0:       doc.iter(checkWidthStart, from.line + change.text.length, function(line) {
michael@0:         var len = lineLength(line);
michael@0:         if (len > display.maxLineLength) {
michael@0:           display.maxLine = line;
michael@0:           display.maxLineLength = len;
michael@0:           display.maxLineChanged = true;
michael@0:           recomputeMaxLength = false;
michael@0:         }
michael@0:       });
michael@0:       if (recomputeMaxLength) cm.curOp.updateMaxLine = true;
michael@0:     }
michael@0: 
michael@0:     // Adjust frontier, schedule worker
michael@0:     doc.frontier = Math.min(doc.frontier, from.line);
michael@0:     startWorker(cm, 400);
michael@0: 
michael@0:     var lendiff = change.text.length - (to.line - from.line) - 1;
michael@0:     // Remember that these lines changed, for updating the display
michael@0:     if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change))
michael@0:       regLineChange(cm, from.line, "text");
michael@0:     else
michael@0:       regChange(cm, from.line, to.line + 1, lendiff);
michael@0: 
michael@0:     if (hasHandler(cm, "change") || hasHandler(cm, "changes"))
michael@0:       (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push({
michael@0:         from: from, to: to,
michael@0:         text: change.text,
michael@0:         removed: change.removed,
michael@0:         origin: change.origin
michael@0:       });
michael@0:   }
michael@0: 
michael@0:   function replaceRange(doc, code, from, to, origin) {
michael@0:     if (!to) to = from;
michael@0:     if (cmp(to, from) < 0) { var tmp = to; to = from; from = tmp; }
michael@0:     if (typeof code == "string") code = splitLines(code);
michael@0:     makeChange(doc, {from: from, to: to, text: code, origin: origin});
michael@0:   }
michael@0: 
michael@0:   // SCROLLING THINGS INTO VIEW
michael@0: 
michael@0:   // If an editor sits on the top or bottom of the window, partially
michael@0:   // scrolled out of view, this ensures that the cursor is visible.
michael@0:   function maybeScrollWindow(cm, coords) {
michael@0:     var display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null;
michael@0:     if (coords.top + box.top < 0) doScroll = true;
michael@0:     else if (coords.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) doScroll = false;
michael@0:     if (doScroll != null && !phantom) {
michael@0:       var scrollNode = elt("div", "\u200b", null, "position: absolute; top: " +
michael@0:                            (coords.top - display.viewOffset - paddingTop(cm.display)) + "px; height: " +
michael@0:                            (coords.bottom - coords.top + scrollerCutOff) + "px; left: " +
michael@0:                            coords.left + "px; width: 2px;");
michael@0:       cm.display.lineSpace.appendChild(scrollNode);
michael@0:       scrollNode.scrollIntoView(doScroll);
michael@0:       cm.display.lineSpace.removeChild(scrollNode);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Scroll a given position into view (immediately), verifying that
michael@0:   // it actually became visible (as line heights are accurately
michael@0:   // measured, the position of something may 'drift' during drawing).
michael@0:   function scrollPosIntoView(cm, pos, end, margin) {
michael@0:     if (margin == null) margin = 0;
michael@0:     for (;;) {
michael@0:       var changed = false, coords = cursorCoords(cm, pos);
michael@0:       var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);
michael@0:       var scrollPos = calculateScrollPos(cm, Math.min(coords.left, endCoords.left),
michael@0:                                          Math.min(coords.top, endCoords.top) - margin,
michael@0:                                          Math.max(coords.left, endCoords.left),
michael@0:                                          Math.max(coords.bottom, endCoords.bottom) + margin);
michael@0:       var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;
michael@0:       if (scrollPos.scrollTop != null) {
michael@0:         setScrollTop(cm, scrollPos.scrollTop);
michael@0:         if (Math.abs(cm.doc.scrollTop - startTop) > 1) changed = true;
michael@0:       }
michael@0:       if (scrollPos.scrollLeft != null) {
michael@0:         setScrollLeft(cm, scrollPos.scrollLeft);
michael@0:         if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) changed = true;
michael@0:       }
michael@0:       if (!changed) return coords;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Scroll a given set of coordinates into view (immediately).
michael@0:   function scrollIntoView(cm, x1, y1, x2, y2) {
michael@0:     var scrollPos = calculateScrollPos(cm, x1, y1, x2, y2);
michael@0:     if (scrollPos.scrollTop != null) setScrollTop(cm, scrollPos.scrollTop);
michael@0:     if (scrollPos.scrollLeft != null) setScrollLeft(cm, scrollPos.scrollLeft);
michael@0:   }
michael@0: 
michael@0:   // Calculate a new scroll position needed to scroll the given
michael@0:   // rectangle into view. Returns an object with scrollTop and
michael@0:   // scrollLeft properties. When these are undefined, the
michael@0:   // vertical/horizontal position does not need to be adjusted.
michael@0:   function calculateScrollPos(cm, x1, y1, x2, y2) {
michael@0:     var display = cm.display, snapMargin = textHeight(cm.display);
michael@0:     if (y1 < 0) y1 = 0;
michael@0:     var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop;
michael@0:     var screen = display.scroller.clientHeight - scrollerCutOff, result = {};
michael@0:     var docBottom = cm.doc.height + paddingVert(display);
michael@0:     var atTop = y1 < snapMargin, atBottom = y2 > docBottom - snapMargin;
michael@0:     if (y1 < screentop) {
michael@0:       result.scrollTop = atTop ? 0 : y1;
michael@0:     } else if (y2 > screentop + screen) {
michael@0:       var newTop = Math.min(y1, (atBottom ? docBottom : y2) - screen);
michael@0:       if (newTop != screentop) result.scrollTop = newTop;
michael@0:     }
michael@0: 
michael@0:     var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft;
michael@0:     var screenw = display.scroller.clientWidth - scrollerCutOff;
michael@0:     x1 += display.gutters.offsetWidth; x2 += display.gutters.offsetWidth;
michael@0:     var gutterw = display.gutters.offsetWidth;
michael@0:     var atLeft = x1 < gutterw + 10;
michael@0:     if (x1 < screenleft + gutterw || atLeft) {
michael@0:       if (atLeft) x1 = 0;
michael@0:       result.scrollLeft = Math.max(0, x1 - 10 - gutterw);
michael@0:     } else if (x2 > screenw + screenleft - 3) {
michael@0:       result.scrollLeft = x2 + 10 - screenw;
michael@0:     }
michael@0:     return result;
michael@0:   }
michael@0: 
michael@0:   // Store a relative adjustment to the scroll position in the current
michael@0:   // operation (to be applied when the operation finishes).
michael@0:   function addToScrollPos(cm, left, top) {
michael@0:     if (left != null || top != null) resolveScrollToPos(cm);
michael@0:     if (left != null)
michael@0:       cm.curOp.scrollLeft = (cm.curOp.scrollLeft == null ? cm.doc.scrollLeft : cm.curOp.scrollLeft) + left;
michael@0:     if (top != null)
michael@0:       cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top;
michael@0:   }
michael@0: 
michael@0:   // Make sure that at the end of the operation the current cursor is
michael@0:   // shown.
michael@0:   function ensureCursorVisible(cm) {
michael@0:     resolveScrollToPos(cm);
michael@0:     var cur = cm.getCursor(), from = cur, to = cur;
michael@0:     if (!cm.options.lineWrapping) {
michael@0:       from = cur.ch ? Pos(cur.line, cur.ch - 1) : cur;
michael@0:       to = Pos(cur.line, cur.ch + 1);
michael@0:     }
michael@0:     cm.curOp.scrollToPos = {from: from, to: to, margin: cm.options.cursorScrollMargin, isCursor: true};
michael@0:   }
michael@0: 
michael@0:   // When an operation has its scrollToPos property set, and another
michael@0:   // scroll action is applied before the end of the operation, this
michael@0:   // 'simulates' scrolling that position into view in a cheap way, so
michael@0:   // that the effect of intermediate scroll commands is not ignored.
michael@0:   function resolveScrollToPos(cm) {
michael@0:     var range = cm.curOp.scrollToPos;
michael@0:     if (range) {
michael@0:       cm.curOp.scrollToPos = null;
michael@0:       var from = estimateCoords(cm, range.from), to = estimateCoords(cm, range.to);
michael@0:       var sPos = calculateScrollPos(cm, Math.min(from.left, to.left),
michael@0:                                     Math.min(from.top, to.top) - range.margin,
michael@0:                                     Math.max(from.right, to.right),
michael@0:                                     Math.max(from.bottom, to.bottom) + range.margin);
michael@0:       cm.scrollTo(sPos.scrollLeft, sPos.scrollTop);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // API UTILITIES
michael@0: 
michael@0:   // Indent the given line. The how parameter can be "smart",
michael@0:   // "add"/null, "subtract", or "prev". When aggressive is false
michael@0:   // (typically set to true for forced single-line indents), empty
michael@0:   // lines are not indented, and places where the mode returns Pass
michael@0:   // are left alone.
michael@0:   function indentLine(cm, n, how, aggressive) {
michael@0:     var doc = cm.doc, state;
michael@0:     if (how == null) how = "add";
michael@0:     if (how == "smart") {
michael@0:       // Fall back to "prev" when the mode doesn't have an indentation
michael@0:       // method.
michael@0:       if (!cm.doc.mode.indent) how = "prev";
michael@0:       else state = getStateBefore(cm, n);
michael@0:     }
michael@0: 
michael@0:     var tabSize = cm.options.tabSize;
michael@0:     var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);
michael@0:     if (line.stateAfter) line.stateAfter = null;
michael@0:     var curSpaceString = line.text.match(/^\s*/)[0], indentation;
michael@0:     if (!aggressive && !/\S/.test(line.text)) {
michael@0:       indentation = 0;
michael@0:       how = "not";
michael@0:     } else if (how == "smart") {
michael@0:       indentation = cm.doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
michael@0:       if (indentation == Pass) {
michael@0:         if (!aggressive) return;
michael@0:         how = "prev";
michael@0:       }
michael@0:     }
michael@0:     if (how == "prev") {
michael@0:       if (n > doc.first) indentation = countColumn(getLine(doc, n-1).text, null, tabSize);
michael@0:       else indentation = 0;
michael@0:     } else if (how == "add") {
michael@0:       indentation = curSpace + cm.options.indentUnit;
michael@0:     } else if (how == "subtract") {
michael@0:       indentation = curSpace - cm.options.indentUnit;
michael@0:     } else if (typeof how == "number") {
michael@0:       indentation = curSpace + how;
michael@0:     }
michael@0:     indentation = Math.max(0, indentation);
michael@0: 
michael@0:     var indentString = "", pos = 0;
michael@0:     if (cm.options.indentWithTabs)
michael@0:       for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t";}
michael@0:     if (pos < indentation) indentString += spaceStr(indentation - pos);
michael@0: 
michael@0:     if (indentString != curSpaceString) {
michael@0:       replaceRange(cm.doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
michael@0:     } else {
michael@0:       // Ensure that, if the cursor was in the whitespace at the start
michael@0:       // of the line, it is moved to the end of that space.
michael@0:       for (var i = 0; i < doc.sel.ranges.length; i++) {
michael@0:         var range = doc.sel.ranges[i];
michael@0:         if (range.head.line == n && range.head.ch < curSpaceString.length) {
michael@0:           var pos = Pos(n, curSpaceString.length);
michael@0:           replaceOneSelection(doc, i, new Range(pos, pos));
michael@0:           break;
michael@0:         }
michael@0:       }
michael@0:     }
michael@0:     line.stateAfter = null;
michael@0:   }
michael@0: 
michael@0:   // Utility for applying a change to a line by handle or number,
michael@0:   // returning the number and optionally registering the line as
michael@0:   // changed.
michael@0:   function changeLine(cm, handle, changeType, op) {
michael@0:     var no = handle, line = handle, doc = cm.doc;
michael@0:     if (typeof handle == "number") line = getLine(doc, clipLine(doc, handle));
michael@0:     else no = lineNo(handle);
michael@0:     if (no == null) return null;
michael@0:     if (op(line, no)) regLineChange(cm, no, changeType);
michael@0:     else return null;
michael@0:     return line;
michael@0:   }
michael@0: 
michael@0:   // Helper for deleting text near the selection(s), used to implement
michael@0:   // backspace, delete, and similar functionality.
michael@0:   function deleteNearSelection(cm, compute) {
michael@0:     var ranges = cm.doc.sel.ranges, kill = [];
michael@0:     // Build up a set of ranges to kill first, merging overlapping
michael@0:     // ranges.
michael@0:     for (var i = 0; i < ranges.length; i++) {
michael@0:       var toKill = compute(ranges[i]);
michael@0:       while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
michael@0:         var replaced = kill.pop();
michael@0:         if (cmp(replaced.from, toKill.from) < 0) {
michael@0:           toKill.from = replaced.from;
michael@0:           break;
michael@0:         }
michael@0:       }
michael@0:       kill.push(toKill);
michael@0:     }
michael@0:     // Next, remove those actual ranges.
michael@0:     runInOp(cm, function() {
michael@0:       for (var i = kill.length - 1; i >= 0; i--)
michael@0:         replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete");
michael@0:       ensureCursorVisible(cm);
michael@0:     });
michael@0:   }
michael@0: 
michael@0:   // Used for horizontal relative motion. Dir is -1 or 1 (left or
michael@0:   // right), unit can be "char", "column" (like char, but doesn't
michael@0:   // cross line boundaries), "word" (across next word), or "group" (to
michael@0:   // the start of next group of word or non-word-non-whitespace
michael@0:   // chars). The visually param controls whether, in right-to-left
michael@0:   // text, direction 1 means to move towards the next index in the
michael@0:   // string, or towards the character to the right of the current
michael@0:   // position. The resulting position will have a hitSide=true
michael@0:   // property if it reached the end of the document.
michael@0:   function findPosH(doc, pos, dir, unit, visually) {
michael@0:     var line = pos.line, ch = pos.ch, origDir = dir;
michael@0:     var lineObj = getLine(doc, line);
michael@0:     var possible = true;
michael@0:     function findNextLine() {
michael@0:       var l = line + dir;
michael@0:       if (l < doc.first || l >= doc.first + doc.size) return (possible = false);
michael@0:       line = l;
michael@0:       return lineObj = getLine(doc, l);
michael@0:     }
michael@0:     function moveOnce(boundToLine) {
michael@0:       var next = (visually ? moveVisually : moveLogically)(lineObj, ch, dir, true);
michael@0:       if (next == null) {
michael@0:         if (!boundToLine && findNextLine()) {
michael@0:           if (visually) ch = (dir < 0 ? lineRight : lineLeft)(lineObj);
michael@0:           else ch = dir < 0 ? lineObj.text.length : 0;
michael@0:         } else return (possible = false);
michael@0:       } else ch = next;
michael@0:       return true;
michael@0:     }
michael@0: 
michael@0:     if (unit == "char") moveOnce();
michael@0:     else if (unit == "column") moveOnce(true);
michael@0:     else if (unit == "word" || unit == "group") {
michael@0:       var sawType = null, group = unit == "group";
michael@0:       for (var first = true;; first = false) {
michael@0:         if (dir < 0 && !moveOnce(!first)) break;
michael@0:         var cur = lineObj.text.charAt(ch) || "\n";
michael@0:         var type = isWordChar(cur) ? "w"
michael@0:           : group && cur == "\n" ? "n"
michael@0:           : !group || /\s/.test(cur) ? null
michael@0:           : "p";
michael@0:         if (group && !first && !type) type = "s";
michael@0:         if (sawType && sawType != type) {
michael@0:           if (dir < 0) {dir = 1; moveOnce();}
michael@0:           break;
michael@0:         }
michael@0: 
michael@0:         if (type) sawType = type;
michael@0:         if (dir > 0 && !moveOnce(!first)) break;
michael@0:       }
michael@0:     }
michael@0:     var result = skipAtomic(doc, Pos(line, ch), origDir, true);
michael@0:     if (!possible) result.hitSide = true;
michael@0:     return result;
michael@0:   }
michael@0: 
michael@0:   // For relative vertical movement. Dir may be -1 or 1. Unit can be
michael@0:   // "page" or "line". The resulting position will have a hitSide=true
michael@0:   // property if it reached the end of the document.
michael@0:   function findPosV(cm, pos, dir, unit) {
michael@0:     var doc = cm.doc, x = pos.left, y;
michael@0:     if (unit == "page") {
michael@0:       var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
michael@0:       y = pos.top + dir * (pageSize - (dir < 0 ? 1.5 : .5) * textHeight(cm.display));
michael@0:     } else if (unit == "line") {
michael@0:       y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
michael@0:     }
michael@0:     for (;;) {
michael@0:       var target = coordsChar(cm, x, y);
michael@0:       if (!target.outside) break;
michael@0:       if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break; }
michael@0:       y += dir * 5;
michael@0:     }
michael@0:     return target;
michael@0:   }
michael@0: 
michael@0:   // Find the word at the given position (as returned by coordsChar).
michael@0:   function findWordAt(doc, pos) {
michael@0:     var line = getLine(doc, pos.line).text;
michael@0:     var start = pos.ch, end = pos.ch;
michael@0:     if (line) {
michael@0:       if ((pos.xRel < 0 || end == line.length) && start) --start; else ++end;
michael@0:       var startChar = line.charAt(start);
michael@0:       var check = isWordChar(startChar) ? isWordChar
michael@0:         : /\s/.test(startChar) ? function(ch) {return /\s/.test(ch);}
michael@0:         : function(ch) {return !/\s/.test(ch) && !isWordChar(ch);};
michael@0:       while (start > 0 && check(line.charAt(start - 1))) --start;
michael@0:       while (end < line.length && check(line.charAt(end))) ++end;
michael@0:     }
michael@0:     return new Range(Pos(pos.line, start), Pos(pos.line, end));
michael@0:   }
michael@0: 
michael@0:   // EDITOR METHODS
michael@0: 
michael@0:   // The publicly visible API. Note that methodOp(f) means
michael@0:   // 'wrap f in an operation, performed on its `this` parameter'.
michael@0: 
michael@0:   // This is not the complete set of editor methods. Most of the
michael@0:   // methods defined on the Doc type are also injected into
michael@0:   // CodeMirror.prototype, for backwards compatibility and
michael@0:   // convenience.
michael@0: 
michael@0:   CodeMirror.prototype = {
michael@0:     constructor: CodeMirror,
michael@0:     focus: function(){window.focus(); focusInput(this); fastPoll(this);},
michael@0: 
michael@0:     setOption: function(option, value) {
michael@0:       var options = this.options, old = options[option];
michael@0:       if (options[option] == value && option != "mode") return;
michael@0:       options[option] = value;
michael@0:       if (optionHandlers.hasOwnProperty(option))
michael@0:         operation(this, optionHandlers[option])(this, value, old);
michael@0:     },
michael@0: 
michael@0:     getOption: function(option) {return this.options[option];},
michael@0:     getDoc: function() {return this.doc;},
michael@0: 
michael@0:     addKeyMap: function(map, bottom) {
michael@0:       this.state.keyMaps[bottom ? "push" : "unshift"](map);
michael@0:     },
michael@0:     removeKeyMap: function(map) {
michael@0:       var maps = this.state.keyMaps;
michael@0:       for (var i = 0; i < maps.length; ++i)
michael@0:         if (maps[i] == map || (typeof maps[i] != "string" && maps[i].name == map)) {
michael@0:           maps.splice(i, 1);
michael@0:           return true;
michael@0:         }
michael@0:     },
michael@0: 
michael@0:     addOverlay: methodOp(function(spec, options) {
michael@0:       var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
michael@0:       if (mode.startState) throw new Error("Overlays may not be stateful.");
michael@0:       this.state.overlays.push({mode: mode, modeSpec: spec, opaque: options && options.opaque});
michael@0:       this.state.modeGen++;
michael@0:       regChange(this);
michael@0:     }),
michael@0:     removeOverlay: methodOp(function(spec) {
michael@0:       var overlays = this.state.overlays;
michael@0:       for (var i = 0; i < overlays.length; ++i) {
michael@0:         var cur = overlays[i].modeSpec;
michael@0:         if (cur == spec || typeof spec == "string" && cur.name == spec) {
michael@0:           overlays.splice(i, 1);
michael@0:           this.state.modeGen++;
michael@0:           regChange(this);
michael@0:           return;
michael@0:         }
michael@0:       }
michael@0:     }),
michael@0: 
michael@0:     indentLine: methodOp(function(n, dir, aggressive) {
michael@0:       if (typeof dir != "string" && typeof dir != "number") {
michael@0:         if (dir == null) dir = this.options.smartIndent ? "smart" : "prev";
michael@0:         else dir = dir ? "add" : "subtract";
michael@0:       }
michael@0:       if (isLine(this.doc, n)) indentLine(this, n, dir, aggressive);
michael@0:     }),
michael@0:     indentSelection: methodOp(function(how) {
michael@0:       var ranges = this.doc.sel.ranges, end = -1;
michael@0:       for (var i = 0; i < ranges.length; i++) {
michael@0:         var range = ranges[i];
michael@0:         if (!range.empty()) {
michael@0:           var start = Math.max(end, range.from().line);
michael@0:           var to = range.to();
michael@0:           end = Math.min(this.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;
michael@0:           for (var j = start; j < end; ++j)
michael@0:             indentLine(this, j, how);
michael@0:         } else if (range.head.line > end) {
michael@0:           indentLine(this, range.head.line, how, true);
michael@0:           end = range.head.line;
michael@0:           if (i == this.doc.sel.primIndex) ensureCursorVisible(this);
michael@0:         }
michael@0:       }
michael@0:     }),
michael@0: 
michael@0:     // Fetch the parser token for a given character. Useful for hacks
michael@0:     // that want to inspect the mode state (say, for completion).
michael@0:     getTokenAt: function(pos, precise) {
michael@0:       var doc = this.doc;
michael@0:       pos = clipPos(doc, pos);
michael@0:       var state = getStateBefore(this, pos.line, precise), mode = this.doc.mode;
michael@0:       var line = getLine(doc, pos.line);
michael@0:       var stream = new StringStream(line.text, this.options.tabSize);
michael@0:       while (stream.pos < pos.ch && !stream.eol()) {
michael@0:         stream.start = stream.pos;
michael@0:         var style = mode.token(stream, state);
michael@0:       }
michael@0:       return {start: stream.start,
michael@0:               end: stream.pos,
michael@0:               string: stream.current(),
michael@0:               type: style || null,
michael@0:               state: state};
michael@0:     },
michael@0: 
michael@0:     getTokenTypeAt: function(pos) {
michael@0:       pos = clipPos(this.doc, pos);
michael@0:       var styles = getLineStyles(this, getLine(this.doc, pos.line));
michael@0:       var before = 0, after = (styles.length - 1) / 2, ch = pos.ch;
michael@0:       if (ch == 0) return styles[2];
michael@0:       for (;;) {
michael@0:         var mid = (before + after) >> 1;
michael@0:         if ((mid ? styles[mid * 2 - 1] : 0) >= ch) after = mid;
michael@0:         else if (styles[mid * 2 + 1] < ch) before = mid + 1;
michael@0:         else return styles[mid * 2 + 2];
michael@0:       }
michael@0:     },
michael@0: 
michael@0:     getModeAt: function(pos) {
michael@0:       var mode = this.doc.mode;
michael@0:       if (!mode.innerMode) return mode;
michael@0:       return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode;
michael@0:     },
michael@0: 
michael@0:     getHelper: function(pos, type) {
michael@0:       return this.getHelpers(pos, type)[0];
michael@0:     },
michael@0: 
michael@0:     getHelpers: function(pos, type) {
michael@0:       var found = [];
michael@0:       if (!helpers.hasOwnProperty(type)) return helpers;
michael@0:       var help = helpers[type], mode = this.getModeAt(pos);
michael@0:       if (typeof mode[type] == "string") {
michael@0:         if (help[mode[type]]) found.push(help[mode[type]]);
michael@0:       } else if (mode[type]) {
michael@0:         for (var i = 0; i < mode[type].length; i++) {
michael@0:           var val = help[mode[type][i]];
michael@0:           if (val) found.push(val);
michael@0:         }
michael@0:       } else if (mode.helperType && help[mode.helperType]) {
michael@0:         found.push(help[mode.helperType]);
michael@0:       } else if (help[mode.name]) {
michael@0:         found.push(help[mode.name]);
michael@0:       }
michael@0:       for (var i = 0; i < help._global.length; i++) {
michael@0:         var cur = help._global[i];
michael@0:         if (cur.pred(mode, this) && indexOf(found, cur.val) == -1)
michael@0:           found.push(cur.val);
michael@0:       }
michael@0:       return found;
michael@0:     },
michael@0: 
michael@0:     getStateAfter: function(line, precise) {
michael@0:       var doc = this.doc;
michael@0:       line = clipLine(doc, line == null ? doc.first + doc.size - 1: line);
michael@0:       return getStateBefore(this, line + 1, precise);
michael@0:     },
michael@0: 
michael@0:     cursorCoords: function(start, mode) {
michael@0:       var pos, range = this.doc.sel.primary();
michael@0:       if (start == null) pos = range.head;
michael@0:       else if (typeof start == "object") pos = clipPos(this.doc, start);
michael@0:       else pos = start ? range.from() : range.to();
michael@0:       return cursorCoords(this, pos, mode || "page");
michael@0:     },
michael@0: 
michael@0:     charCoords: function(pos, mode) {
michael@0:       return charCoords(this, clipPos(this.doc, pos), mode || "page");
michael@0:     },
michael@0: 
michael@0:     coordsChar: function(coords, mode) {
michael@0:       coords = fromCoordSystem(this, coords, mode || "page");
michael@0:       return coordsChar(this, coords.left, coords.top);
michael@0:     },
michael@0: 
michael@0:     lineAtHeight: function(height, mode) {
michael@0:       height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top;
michael@0:       return lineAtHeight(this.doc, height + this.display.viewOffset);
michael@0:     },
michael@0:     heightAtLine: function(line, mode) {
michael@0:       var end = false, last = this.doc.first + this.doc.size - 1;
michael@0:       if (line < this.doc.first) line = this.doc.first;
michael@0:       else if (line > last) { line = last; end = true; }
michael@0:       var lineObj = getLine(this.doc, line);
michael@0:       return intoCoordSystem(this, lineObj, {top: 0, left: 0}, mode || "page").top +
michael@0:         (end ? this.doc.height - heightAtLine(lineObj) : 0);
michael@0:     },
michael@0: 
michael@0:     defaultTextHeight: function() { return textHeight(this.display); },
michael@0:     defaultCharWidth: function() { return charWidth(this.display); },
michael@0: 
michael@0:     setGutterMarker: methodOp(function(line, gutterID, value) {
michael@0:       return changeLine(this, line, "gutter", function(line) {
michael@0:         var markers = line.gutterMarkers || (line.gutterMarkers = {});
michael@0:         markers[gutterID] = value;
michael@0:         if (!value && isEmpty(markers)) line.gutterMarkers = null;
michael@0:         return true;
michael@0:       });
michael@0:     }),
michael@0: 
michael@0:     clearGutter: methodOp(function(gutterID) {
michael@0:       var cm = this, doc = cm.doc, i = doc.first;
michael@0:       doc.iter(function(line) {
michael@0:         if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
michael@0:           line.gutterMarkers[gutterID] = null;
michael@0:           regLineChange(cm, i, "gutter");
michael@0:           if (isEmpty(line.gutterMarkers)) line.gutterMarkers = null;
michael@0:         }
michael@0:         ++i;
michael@0:       });
michael@0:     }),
michael@0: 
michael@0:     addLineClass: methodOp(function(handle, where, cls) {
michael@0:       return changeLine(this, handle, "class", function(line) {
michael@0:         var prop = where == "text" ? "textClass" : where == "background" ? "bgClass" : "wrapClass";
michael@0:         if (!line[prop]) line[prop] = cls;
michael@0:         else if (new RegExp("(?:^|\\s)" + cls + "(?:$|\\s)").test(line[prop])) return false;
michael@0:         else line[prop] += " " + cls;
michael@0:         return true;
michael@0:       });
michael@0:     }),
michael@0: 
michael@0:     removeLineClass: methodOp(function(handle, where, cls) {
michael@0:       return changeLine(this, handle, "class", function(line) {
michael@0:         var prop = where == "text" ? "textClass" : where == "background" ? "bgClass" : "wrapClass";
michael@0:         var cur = line[prop];
michael@0:         if (!cur) return false;
michael@0:         else if (cls == null) line[prop] = null;
michael@0:         else {
michael@0:           var found = cur.match(new RegExp("(?:^|\\s+)" + cls + "(?:$|\\s+)"));
michael@0:           if (!found) return false;
michael@0:           var end = found.index + found[0].length;
michael@0:           line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;
michael@0:         }
michael@0:         return true;
michael@0:       });
michael@0:     }),
michael@0: 
michael@0:     addLineWidget: methodOp(function(handle, node, options) {
michael@0:       return addLineWidget(this, handle, node, options);
michael@0:     }),
michael@0: 
michael@0:     removeLineWidget: function(widget) { widget.clear(); },
michael@0: 
michael@0:     lineInfo: function(line) {
michael@0:       if (typeof line == "number") {
michael@0:         if (!isLine(this.doc, line)) return null;
michael@0:         var n = line;
michael@0:         line = getLine(this.doc, line);
michael@0:         if (!line) return null;
michael@0:       } else {
michael@0:         var n = lineNo(line);
michael@0:         if (n == null) return null;
michael@0:       }
michael@0:       return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
michael@0:               textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
michael@0:               widgets: line.widgets};
michael@0:     },
michael@0: 
michael@0:     getViewport: function() { return {from: this.display.viewFrom, to: this.display.viewTo};},
michael@0: 
michael@0:     addWidget: function(pos, node, scroll, vert, horiz) {
michael@0:       var display = this.display;
michael@0:       pos = cursorCoords(this, clipPos(this.doc, pos));
michael@0:       var top = pos.bottom, left = pos.left;
michael@0:       node.style.position = "absolute";
michael@0:       display.sizer.appendChild(node);
michael@0:       if (vert == "over") {
michael@0:         top = pos.top;
michael@0:       } else if (vert == "above" || vert == "near") {
michael@0:         var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
michael@0:         hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
michael@0:         // Default to positioning above (if specified and possible); otherwise default to positioning below
michael@0:         if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)
michael@0:           top = pos.top - node.offsetHeight;
michael@0:         else if (pos.bottom + node.offsetHeight <= vspace)
michael@0:           top = pos.bottom;
michael@0:         if (left + node.offsetWidth > hspace)
michael@0:           left = hspace - node.offsetWidth;
michael@0:       }
michael@0:       node.style.top = top + "px";
michael@0:       node.style.left = node.style.right = "";
michael@0:       if (horiz == "right") {
michael@0:         left = display.sizer.clientWidth - node.offsetWidth;
michael@0:         node.style.right = "0px";
michael@0:       } else {
michael@0:         if (horiz == "left") left = 0;
michael@0:         else if (horiz == "middle") left = (display.sizer.clientWidth - node.offsetWidth) / 2;
michael@0:         node.style.left = left + "px";
michael@0:       }
michael@0:       if (scroll)
michael@0:         scrollIntoView(this, left, top, left + node.offsetWidth, top + node.offsetHeight);
michael@0:     },
michael@0: 
michael@0:     triggerOnKeyDown: methodOp(onKeyDown),
michael@0:     triggerOnKeyPress: methodOp(onKeyPress),
michael@0:     triggerOnKeyUp: methodOp(onKeyUp),
michael@0: 
michael@0:     execCommand: function(cmd) {
michael@0:       if (commands.hasOwnProperty(cmd))
michael@0:         return commands[cmd](this);
michael@0:     },
michael@0: 
michael@0:     findPosH: function(from, amount, unit, visually) {
michael@0:       var dir = 1;
michael@0:       if (amount < 0) { dir = -1; amount = -amount; }
michael@0:       for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {
michael@0:         cur = findPosH(this.doc, cur, dir, unit, visually);
michael@0:         if (cur.hitSide) break;
michael@0:       }
michael@0:       return cur;
michael@0:     },
michael@0: 
michael@0:     moveH: methodOp(function(dir, unit) {
michael@0:       var cm = this;
michael@0:       cm.extendSelectionsBy(function(range) {
michael@0:         if (cm.display.shift || cm.doc.extend || range.empty())
michael@0:           return findPosH(cm.doc, range.head, dir, unit, cm.options.rtlMoveVisually);
michael@0:         else
michael@0:           return dir < 0 ? range.from() : range.to();
michael@0:       }, sel_move);
michael@0:     }),
michael@0: 
michael@0:     deleteH: methodOp(function(dir, unit) {
michael@0:       var sel = this.doc.sel, doc = this.doc;
michael@0:       if (sel.somethingSelected())
michael@0:         doc.replaceSelection("", null, "+delete");
michael@0:       else
michael@0:         deleteNearSelection(this, function(range) {
michael@0:           var other = findPosH(doc, range.head, dir, unit, false);
michael@0:           return dir < 0 ? {from: other, to: range.head} : {from: range.head, to: other};
michael@0:         });
michael@0:     }),
michael@0: 
michael@0:     findPosV: function(from, amount, unit, goalColumn) {
michael@0:       var dir = 1, x = goalColumn;
michael@0:       if (amount < 0) { dir = -1; amount = -amount; }
michael@0:       for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {
michael@0:         var coords = cursorCoords(this, cur, "div");
michael@0:         if (x == null) x = coords.left;
michael@0:         else coords.left = x;
michael@0:         cur = findPosV(this, coords, dir, unit);
michael@0:         if (cur.hitSide) break;
michael@0:       }
michael@0:       return cur;
michael@0:     },
michael@0: 
michael@0:     moveV: methodOp(function(dir, unit) {
michael@0:       var cm = this, doc = this.doc, goals = [];
michael@0:       var collapse = !cm.display.shift && !doc.extend && doc.sel.somethingSelected();
michael@0:       doc.extendSelectionsBy(function(range) {
michael@0:         if (collapse)
michael@0:           return dir < 0 ? range.from() : range.to();
michael@0:         var headPos = cursorCoords(cm, range.head, "div");
michael@0:         if (range.goalColumn != null) headPos.left = range.goalColumn;
michael@0:         goals.push(headPos.left);
michael@0:         var pos = findPosV(cm, headPos, dir, unit);
michael@0:         if (unit == "page" && range == doc.sel.primary())
michael@0:           addToScrollPos(cm, null, charCoords(cm, pos, "div").top - headPos.top);
michael@0:         return pos;
michael@0:       }, sel_move);
michael@0:       if (goals.length) for (var i = 0; i < doc.sel.ranges.length; i++)
michael@0:         doc.sel.ranges[i].goalColumn = goals[i];
michael@0:     }),
michael@0: 
michael@0:     toggleOverwrite: function(value) {
michael@0:       if (value != null && value == this.state.overwrite) return;
michael@0:       if (this.state.overwrite = !this.state.overwrite)
michael@0:         this.display.cursorDiv.className += " CodeMirror-overwrite";
michael@0:       else
michael@0:         this.display.cursorDiv.className = this.display.cursorDiv.className.replace(" CodeMirror-overwrite", "");
michael@0: 
michael@0:       signal(this, "overwriteToggle", this, this.state.overwrite);
michael@0:     },
michael@0:     hasFocus: function() { return activeElt() == this.display.input; },
michael@0: 
michael@0:     scrollTo: methodOp(function(x, y) {
michael@0:       if (x != null || y != null) resolveScrollToPos(this);
michael@0:       if (x != null) this.curOp.scrollLeft = x;
michael@0:       if (y != null) this.curOp.scrollTop = y;
michael@0:     }),
michael@0:     getScrollInfo: function() {
michael@0:       var scroller = this.display.scroller, co = scrollerCutOff;
michael@0:       return {left: scroller.scrollLeft, top: scroller.scrollTop,
michael@0:               height: scroller.scrollHeight - co, width: scroller.scrollWidth - co,
michael@0:               clientHeight: scroller.clientHeight - co, clientWidth: scroller.clientWidth - co};
michael@0:     },
michael@0: 
michael@0:     scrollIntoView: methodOp(function(range, margin) {
michael@0:       if (range == null) {
michael@0:         range = {from: this.doc.sel.primary().head, to: null};
michael@0:         if (margin == null) margin = this.options.cursorScrollMargin;
michael@0:       } else if (typeof range == "number") {
michael@0:         range = {from: Pos(range, 0), to: null};
michael@0:       } else if (range.from == null) {
michael@0:         range = {from: range, to: null};
michael@0:       }
michael@0:       if (!range.to) range.to = range.from;
michael@0:       range.margin = margin || 0;
michael@0: 
michael@0:       if (range.from.line != null) {
michael@0:         resolveScrollToPos(this);
michael@0:         this.curOp.scrollToPos = range;
michael@0:       } else {
michael@0:         var sPos = calculateScrollPos(this, Math.min(range.from.left, range.to.left),
michael@0:                                       Math.min(range.from.top, range.to.top) - range.margin,
michael@0:                                       Math.max(range.from.right, range.to.right),
michael@0:                                       Math.max(range.from.bottom, range.to.bottom) + range.margin);
michael@0:         this.scrollTo(sPos.scrollLeft, sPos.scrollTop);
michael@0:       }
michael@0:     }),
michael@0: 
michael@0:     setSize: methodOp(function(width, height) {
michael@0:       function interpret(val) {
michael@0:         return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val;
michael@0:       }
michael@0:       if (width != null) this.display.wrapper.style.width = interpret(width);
michael@0:       if (height != null) this.display.wrapper.style.height = interpret(height);
michael@0:       if (this.options.lineWrapping) clearLineMeasurementCache(this);
michael@0:       this.curOp.forceUpdate = true;
michael@0:       signal(this, "refresh", this);
michael@0:     }),
michael@0: 
michael@0:     operation: function(f){return runInOp(this, f);},
michael@0: 
michael@0:     refresh: methodOp(function() {
michael@0:       var oldHeight = this.display.cachedTextHeight;
michael@0:       regChange(this);
michael@0:       clearCaches(this);
michael@0:       this.scrollTo(this.doc.scrollLeft, this.doc.scrollTop);
michael@0:       if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5)
michael@0:         estimateLineHeights(this);
michael@0:       signal(this, "refresh", this);
michael@0:     }),
michael@0: 
michael@0:     swapDoc: methodOp(function(doc) {
michael@0:       var old = this.doc;
michael@0:       old.cm = null;
michael@0:       attachDoc(this, doc);
michael@0:       clearCaches(this);
michael@0:       resetInput(this);
michael@0:       this.scrollTo(doc.scrollLeft, doc.scrollTop);
michael@0:       signalLater(this, "swapDoc", this, old);
michael@0:       return old;
michael@0:     }),
michael@0: 
michael@0:     getInputField: function(){return this.display.input;},
michael@0:     getWrapperElement: function(){return this.display.wrapper;},
michael@0:     getScrollerElement: function(){return this.display.scroller;},
michael@0:     getGutterElement: function(){return this.display.gutters;}
michael@0:   };
michael@0:   eventMixin(CodeMirror);
michael@0: 
michael@0:   // OPTION DEFAULTS
michael@0: 
michael@0:   // The default configuration options.
michael@0:   var defaults = CodeMirror.defaults = {};
michael@0:   // Functions to run when options are changed.
michael@0:   var optionHandlers = CodeMirror.optionHandlers = {};
michael@0: 
michael@0:   function option(name, deflt, handle, notOnInit) {
michael@0:     CodeMirror.defaults[name] = deflt;
michael@0:     if (handle) optionHandlers[name] =
michael@0:       notOnInit ? function(cm, val, old) {if (old != Init) handle(cm, val, old);} : handle;
michael@0:   }
michael@0: 
michael@0:   // Passed to option handlers when there is no old value.
michael@0:   var Init = CodeMirror.Init = {toString: function(){return "CodeMirror.Init";}};
michael@0: 
michael@0:   // These two are, on init, called from the constructor because they
michael@0:   // have to be initialized before the editor can start at all.
michael@0:   option("value", "", function(cm, val) {
michael@0:     cm.setValue(val);
michael@0:   }, true);
michael@0:   option("mode", null, function(cm, val) {
michael@0:     cm.doc.modeOption = val;
michael@0:     loadMode(cm);
michael@0:   }, true);
michael@0: 
michael@0:   option("indentUnit", 2, loadMode, true);
michael@0:   option("indentWithTabs", false);
michael@0:   option("smartIndent", true);
michael@0:   option("tabSize", 4, function(cm) {
michael@0:     resetModeState(cm);
michael@0:     clearCaches(cm);
michael@0:     regChange(cm);
michael@0:   }, true);
michael@0:   option("specialChars", /[\t\u0000-\u0019\u00ad\u200b\u2028\u2029\ufeff]/g, function(cm, val) {
michael@0:     cm.options.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g");
michael@0:     cm.refresh();
michael@0:   }, true);
michael@0:   option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function(cm) {cm.refresh();}, true);
michael@0:   option("electricChars", true);
michael@0:   option("rtlMoveVisually", !windows);
michael@0:   option("wholeLineUpdateBefore", true);
michael@0: 
michael@0:   option("theme", "default", function(cm) {
michael@0:     themeChanged(cm);
michael@0:     guttersChanged(cm);
michael@0:   }, true);
michael@0:   option("keyMap", "default", keyMapChanged);
michael@0:   option("extraKeys", null);
michael@0: 
michael@0:   option("lineWrapping", false, wrappingChanged, true);
michael@0:   option("gutters", [], function(cm) {
michael@0:     setGuttersForLineNumbers(cm.options);
michael@0:     guttersChanged(cm);
michael@0:   }, true);
michael@0:   option("fixedGutter", true, function(cm, val) {
michael@0:     cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";
michael@0:     cm.refresh();
michael@0:   }, true);
michael@0:   option("coverGutterNextToScrollbar", false, updateScrollbars, true);
michael@0:   option("lineNumbers", false, function(cm) {
michael@0:     setGuttersForLineNumbers(cm.options);
michael@0:     guttersChanged(cm);
michael@0:   }, true);
michael@0:   option("firstLineNumber", 1, guttersChanged, true);
michael@0:   option("lineNumberFormatter", function(integer) {return integer;}, guttersChanged, true);
michael@0:   option("showCursorWhenSelecting", false, updateSelection, true);
michael@0: 
michael@0:   option("resetSelectionOnContextMenu", true);
michael@0: 
michael@0:   option("readOnly", false, function(cm, val) {
michael@0:     if (val == "nocursor") {
michael@0:       onBlur(cm);
michael@0:       cm.display.input.blur();
michael@0:       cm.display.disabled = true;
michael@0:     } else {
michael@0:       cm.display.disabled = false;
michael@0:       if (!val) resetInput(cm);
michael@0:     }
michael@0:   });
michael@0:   option("disableInput", false, function(cm, val) {if (!val) resetInput(cm);}, true);
michael@0:   option("dragDrop", true);
michael@0: 
michael@0:   option("cursorBlinkRate", 530);
michael@0:   option("cursorScrollMargin", 0);
michael@0:   option("cursorHeight", 1);
michael@0:   option("workTime", 100);
michael@0:   option("workDelay", 100);
michael@0:   option("flattenSpans", true, resetModeState, true);
michael@0:   option("addModeClass", false, resetModeState, true);
michael@0:   option("pollInterval", 100);
michael@0:   option("undoDepth", 200, function(cm, val){cm.doc.history.undoDepth = val;});
michael@0:   option("historyEventDelay", 1250);
michael@0:   option("viewportMargin", 10, function(cm){cm.refresh();}, true);
michael@0:   option("maxHighlightLength", 10000, resetModeState, true);
michael@0:   option("moveInputWithCursor", true, function(cm, val) {
michael@0:     if (!val) cm.display.inputDiv.style.top = cm.display.inputDiv.style.left = 0;
michael@0:   });
michael@0: 
michael@0:   option("tabindex", null, function(cm, val) {
michael@0:     cm.display.input.tabIndex = val || "";
michael@0:   });
michael@0:   option("autofocus", null);
michael@0: 
michael@0:   // MODE DEFINITION AND QUERYING
michael@0: 
michael@0:   // Known modes, by name and by MIME
michael@0:   var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};
michael@0: 
michael@0:   // Extra arguments are stored as the mode's dependencies, which is
michael@0:   // used by (legacy) mechanisms like loadmode.js to automatically
michael@0:   // load a mode. (Preferred mechanism is the require/define calls.)
michael@0:   CodeMirror.defineMode = function(name, mode) {
michael@0:     if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;
michael@0:     if (arguments.length > 2) {
michael@0:       mode.dependencies = [];
michael@0:       for (var i = 2; i < arguments.length; ++i) mode.dependencies.push(arguments[i]);
michael@0:     }
michael@0:     modes[name] = mode;
michael@0:   };
michael@0: 
michael@0:   CodeMirror.defineMIME = function(mime, spec) {
michael@0:     mimeModes[mime] = spec;
michael@0:   };
michael@0: 
michael@0:   // Given a MIME type, a {name, ...options} config object, or a name
michael@0:   // string, return a mode config object.
michael@0:   CodeMirror.resolveMode = function(spec) {
michael@0:     if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
michael@0:       spec = mimeModes[spec];
michael@0:     } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
michael@0:       var found = mimeModes[spec.name];
michael@0:       if (typeof found == "string") found = {name: found};
michael@0:       spec = createObj(found, spec);
michael@0:       spec.name = found.name;
michael@0:     } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
michael@0:       return CodeMirror.resolveMode("application/xml");
michael@0:     }
michael@0:     if (typeof spec == "string") return {name: spec};
michael@0:     else return spec || {name: "null"};
michael@0:   };
michael@0: 
michael@0:   // Given a mode spec (anything that resolveMode accepts), find and
michael@0:   // initialize an actual mode object.
michael@0:   CodeMirror.getMode = function(options, spec) {
michael@0:     var spec = CodeMirror.resolveMode(spec);
michael@0:     var mfactory = modes[spec.name];
michael@0:     if (!mfactory) return CodeMirror.getMode(options, "text/plain");
michael@0:     var modeObj = mfactory(options, spec);
michael@0:     if (modeExtensions.hasOwnProperty(spec.name)) {
michael@0:       var exts = modeExtensions[spec.name];
michael@0:       for (var prop in exts) {
michael@0:         if (!exts.hasOwnProperty(prop)) continue;
michael@0:         if (modeObj.hasOwnProperty(prop)) modeObj["_" + prop] = modeObj[prop];
michael@0:         modeObj[prop] = exts[prop];
michael@0:       }
michael@0:     }
michael@0:     modeObj.name = spec.name;
michael@0:     if (spec.helperType) modeObj.helperType = spec.helperType;
michael@0:     if (spec.modeProps) for (var prop in spec.modeProps)
michael@0:       modeObj[prop] = spec.modeProps[prop];
michael@0: 
michael@0:     return modeObj;
michael@0:   };
michael@0: 
michael@0:   // Minimal default mode.
michael@0:   CodeMirror.defineMode("null", function() {
michael@0:     return {token: function(stream) {stream.skipToEnd();}};
michael@0:   });
michael@0:   CodeMirror.defineMIME("text/plain", "null");
michael@0: 
michael@0:   // This can be used to attach properties to mode objects from
michael@0:   // outside the actual mode definition.
michael@0:   var modeExtensions = CodeMirror.modeExtensions = {};
michael@0:   CodeMirror.extendMode = function(mode, properties) {
michael@0:     var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
michael@0:     copyObj(properties, exts);
michael@0:   };
michael@0: 
michael@0:   // EXTENSIONS
michael@0: 
michael@0:   CodeMirror.defineExtension = function(name, func) {
michael@0:     CodeMirror.prototype[name] = func;
michael@0:   };
michael@0:   CodeMirror.defineDocExtension = function(name, func) {
michael@0:     Doc.prototype[name] = func;
michael@0:   };
michael@0:   CodeMirror.defineOption = option;
michael@0: 
michael@0:   var initHooks = [];
michael@0:   CodeMirror.defineInitHook = function(f) {initHooks.push(f);};
michael@0: 
michael@0:   var helpers = CodeMirror.helpers = {};
michael@0:   CodeMirror.registerHelper = function(type, name, value) {
michael@0:     if (!helpers.hasOwnProperty(type)) helpers[type] = CodeMirror[type] = {_global: []};
michael@0:     helpers[type][name] = value;
michael@0:   };
michael@0:   CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {
michael@0:     CodeMirror.registerHelper(type, name, value);
michael@0:     helpers[type]._global.push({pred: predicate, val: value});
michael@0:   };
michael@0: 
michael@0:   // MODE STATE HANDLING
michael@0: 
michael@0:   // Utility functions for working with state. Exported because nested
michael@0:   // modes need to do this for their inner modes.
michael@0: 
michael@0:   var copyState = CodeMirror.copyState = function(mode, state) {
michael@0:     if (state === true) return state;
michael@0:     if (mode.copyState) return mode.copyState(state);
michael@0:     var nstate = {};
michael@0:     for (var n in state) {
michael@0:       var val = state[n];
michael@0:       if (val instanceof Array) val = val.concat([]);
michael@0:       nstate[n] = val;
michael@0:     }
michael@0:     return nstate;
michael@0:   };
michael@0: 
michael@0:   var startState = CodeMirror.startState = function(mode, a1, a2) {
michael@0:     return mode.startState ? mode.startState(a1, a2) : true;
michael@0:   };
michael@0: 
michael@0:   // Given a mode and a state (for that mode), find the inner mode and
michael@0:   // state at the position that the state refers to.
michael@0:   CodeMirror.innerMode = function(mode, state) {
michael@0:     while (mode.innerMode) {
michael@0:       var info = mode.innerMode(state);
michael@0:       if (!info || info.mode == mode) break;
michael@0:       state = info.state;
michael@0:       mode = info.mode;
michael@0:     }
michael@0:     return info || {mode: mode, state: state};
michael@0:   };
michael@0: 
michael@0:   // STANDARD COMMANDS
michael@0: 
michael@0:   // Commands are parameter-less actions that can be performed on an
michael@0:   // editor, mostly used for keybindings.
michael@0:   var commands = CodeMirror.commands = {
michael@0:     selectAll: function(cm) {cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);},
michael@0:     singleSelection: function(cm) {
michael@0:       cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll);
michael@0:     },
michael@0:     killLine: function(cm) {
michael@0:       deleteNearSelection(cm, function(range) {
michael@0:         if (range.empty()) {
michael@0:           var len = getLine(cm.doc, range.head.line).text.length;
michael@0:           if (range.head.ch == len && range.head.line < cm.lastLine())
michael@0:             return {from: range.head, to: Pos(range.head.line + 1, 0)};
michael@0:           else
michael@0:             return {from: range.head, to: Pos(range.head.line, len)};
michael@0:         } else {
michael@0:           return {from: range.from(), to: range.to()};
michael@0:         }
michael@0:       });
michael@0:     },
michael@0:     deleteLine: function(cm) {
michael@0:       deleteNearSelection(cm, function(range) {
michael@0:         return {from: Pos(range.from().line, 0),
michael@0:                 to: clipPos(cm.doc, Pos(range.to().line + 1, 0))};
michael@0:       });
michael@0:     },
michael@0:     delLineLeft: function(cm) {
michael@0:       deleteNearSelection(cm, function(range) {
michael@0:         return {from: Pos(range.from().line, 0), to: range.from()};
michael@0:       });
michael@0:     },
michael@0:     undo: function(cm) {cm.undo();},
michael@0:     redo: function(cm) {cm.redo();},
michael@0:     undoSelection: function(cm) {cm.undoSelection();},
michael@0:     redoSelection: function(cm) {cm.redoSelection();},
michael@0:     goDocStart: function(cm) {cm.extendSelection(Pos(cm.firstLine(), 0));},
michael@0:     goDocEnd: function(cm) {cm.extendSelection(Pos(cm.lastLine()));},
michael@0:     goLineStart: function(cm) {
michael@0:       cm.extendSelectionsBy(function(range) { return lineStart(cm, range.head.line); }, sel_move);
michael@0:     },
michael@0:     goLineStartSmart: function(cm) {
michael@0:       cm.extendSelectionsBy(function(range) {
michael@0:         var start = lineStart(cm, range.head.line);
michael@0:         var line = cm.getLineHandle(start.line);
michael@0:         var order = getOrder(line);
michael@0:         if (!order || order[0].level == 0) {
michael@0:           var firstNonWS = Math.max(0, line.text.search(/\S/));
michael@0:           var inWS = range.head.line == start.line && range.head.ch <= firstNonWS && range.head.ch;
michael@0:           return Pos(start.line, inWS ? 0 : firstNonWS);
michael@0:         }
michael@0:         return start;
michael@0:       }, sel_move);
michael@0:     },
michael@0:     goLineEnd: function(cm) {
michael@0:       cm.extendSelectionsBy(function(range) { return lineEnd(cm, range.head.line); }, sel_move);
michael@0:     },
michael@0:     goLineRight: function(cm) {
michael@0:       cm.extendSelectionsBy(function(range) {
michael@0:         var top = cm.charCoords(range.head, "div").top + 5;
michael@0:         return cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div");
michael@0:       }, sel_move);
michael@0:     },
michael@0:     goLineLeft: function(cm) {
michael@0:       cm.extendSelectionsBy(function(range) {
michael@0:         var top = cm.charCoords(range.head, "div").top + 5;
michael@0:         return cm.coordsChar({left: 0, top: top}, "div");
michael@0:       }, sel_move);
michael@0:     },
michael@0:     goLineUp: function(cm) {cm.moveV(-1, "line");},
michael@0:     goLineDown: function(cm) {cm.moveV(1, "line");},
michael@0:     goPageUp: function(cm) {cm.moveV(-1, "page");},
michael@0:     goPageDown: function(cm) {cm.moveV(1, "page");},
michael@0:     goCharLeft: function(cm) {cm.moveH(-1, "char");},
michael@0:     goCharRight: function(cm) {cm.moveH(1, "char");},
michael@0:     goColumnLeft: function(cm) {cm.moveH(-1, "column");},
michael@0:     goColumnRight: function(cm) {cm.moveH(1, "column");},
michael@0:     goWordLeft: function(cm) {cm.moveH(-1, "word");},
michael@0:     goGroupRight: function(cm) {cm.moveH(1, "group");},
michael@0:     goGroupLeft: function(cm) {cm.moveH(-1, "group");},
michael@0:     goWordRight: function(cm) {cm.moveH(1, "word");},
michael@0:     delCharBefore: function(cm) {cm.deleteH(-1, "char");},
michael@0:     delCharAfter: function(cm) {cm.deleteH(1, "char");},
michael@0:     delWordBefore: function(cm) {cm.deleteH(-1, "word");},
michael@0:     delWordAfter: function(cm) {cm.deleteH(1, "word");},
michael@0:     delGroupBefore: function(cm) {cm.deleteH(-1, "group");},
michael@0:     delGroupAfter: function(cm) {cm.deleteH(1, "group");},
michael@0:     indentAuto: function(cm) {cm.indentSelection("smart");},
michael@0:     indentMore: function(cm) {cm.indentSelection("add");},
michael@0:     indentLess: function(cm) {cm.indentSelection("subtract");},
michael@0:     insertTab: function(cm) {cm.replaceSelection("\t");},
michael@0:     defaultTab: function(cm) {
michael@0:       if (cm.somethingSelected()) cm.indentSelection("add");
michael@0:       else cm.execCommand("insertTab");
michael@0:     },
michael@0:     transposeChars: function(cm) {
michael@0:       runInOp(cm, function() {
michael@0:         var ranges = cm.listSelections();
michael@0:         for (var i = 0; i < ranges.length; i++) {
michael@0:           var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text;
michael@0:           if (cur.ch > 0 && cur.ch < line.length - 1)
michael@0:             cm.replaceRange(line.charAt(cur.ch) + line.charAt(cur.ch - 1),
michael@0:                             Pos(cur.line, cur.ch - 1), Pos(cur.line, cur.ch + 1));
michael@0:         }
michael@0:       });
michael@0:     },
michael@0:     newlineAndIndent: function(cm) {
michael@0:       runInOp(cm, function() {
michael@0:         var len = cm.listSelections().length;
michael@0:         for (var i = 0; i < len; i++) {
michael@0:           var range = cm.listSelections()[i];
michael@0:           cm.replaceRange("\n", range.anchor, range.head, "+input");
michael@0:           cm.indentLine(range.from().line + 1, null, true);
michael@0:           ensureCursorVisible(cm);
michael@0:         }
michael@0:       });
michael@0:     },
michael@0:     toggleOverwrite: function(cm) {cm.toggleOverwrite();}
michael@0:   };
michael@0: 
michael@0:   // STANDARD KEYMAPS
michael@0: 
michael@0:   var keyMap = CodeMirror.keyMap = {};
michael@0:   keyMap.basic = {
michael@0:     "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
michael@0:     "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
michael@0:     "Delete": "delCharAfter", "Backspace": "delCharBefore", "Shift-Backspace": "delCharBefore",
michael@0:     "Tab": "defaultTab", "Shift-Tab": "indentAuto",
michael@0:     "Enter": "newlineAndIndent", "Insert": "toggleOverwrite",
michael@0:     "Esc": "singleSelection"
michael@0:   };
michael@0:   // Note that the save and find-related commands aren't defined by
michael@0:   // default. User code or addons can define them. Unknown commands
michael@0:   // are simply ignored.
michael@0:   keyMap.pcDefault = {
michael@0:     "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
michael@0:     "Ctrl-Home": "goDocStart", "Ctrl-Up": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Down": "goDocEnd",
michael@0:     "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
michael@0:     "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",
michael@0:     "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
michael@0:     "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
michael@0:     "Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",
michael@0:     fallthrough: "basic"
michael@0:   };
michael@0:   keyMap.macDefault = {
michael@0:     "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
michael@0:     "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
michael@0:     "Alt-Right": "goGroupRight", "Cmd-Left": "goLineStart", "Cmd-Right": "goLineEnd", "Alt-Backspace": "delGroupBefore",
michael@0:     "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
michael@0:     "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
michael@0:     "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delLineLeft",
michael@0:     "Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection",
michael@0:     fallthrough: ["basic", "emacsy"]
michael@0:   };
michael@0:   // Very basic readline/emacs-style bindings, which are standard on Mac.
michael@0:   keyMap.emacsy = {
michael@0:     "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
michael@0:     "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
michael@0:     "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore",
michael@0:     "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars"
michael@0:   };
michael@0:   keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
michael@0: 
michael@0:   // KEYMAP DISPATCH
michael@0: 
michael@0:   function getKeyMap(val) {
michael@0:     if (typeof val == "string") return keyMap[val];
michael@0:     else return val;
michael@0:   }
michael@0: 
michael@0:   // Given an array of keymaps and a key name, call handle on any
michael@0:   // bindings found, until that returns a truthy value, at which point
michael@0:   // we consider the key handled. Implements things like binding a key
michael@0:   // to false stopping further handling and keymap fallthrough.
michael@0:   var lookupKey = CodeMirror.lookupKey = function(name, maps, handle) {
michael@0:     function lookup(map) {
michael@0:       map = getKeyMap(map);
michael@0:       var found = map[name];
michael@0:       if (found === false) return "stop";
michael@0:       if (found != null && handle(found)) return true;
michael@0:       if (map.nofallthrough) return "stop";
michael@0: 
michael@0:       var fallthrough = map.fallthrough;
michael@0:       if (fallthrough == null) return false;
michael@0:       if (Object.prototype.toString.call(fallthrough) != "[object Array]")
michael@0:         return lookup(fallthrough);
michael@0:       for (var i = 0; i < fallthrough.length; ++i) {
michael@0:         var done = lookup(fallthrough[i]);
michael@0:         if (done) return done;
michael@0:       }
michael@0:       return false;
michael@0:     }
michael@0: 
michael@0:     for (var i = 0; i < maps.length; ++i) {
michael@0:       var done = lookup(maps[i]);
michael@0:       if (done) return done != "stop";
michael@0:     }
michael@0:   };
michael@0: 
michael@0:   // Modifier key presses don't count as 'real' key presses for the
michael@0:   // purpose of keymap fallthrough.
michael@0:   var isModifierKey = CodeMirror.isModifierKey = function(event) {
michael@0:     var name = keyNames[event.keyCode];
michael@0:     return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";
michael@0:   };
michael@0: 
michael@0:   // Look up the name of a key as indicated by an event object.
michael@0:   var keyName = CodeMirror.keyName = function(event, noShift) {
michael@0:     if (presto && event.keyCode == 34 && event["char"]) return false;
michael@0:     var name = keyNames[event.keyCode];
michael@0:     if (name == null || event.altGraphKey) return false;
michael@0:     if (event.altKey) name = "Alt-" + name;
michael@0:     if (flipCtrlCmd ? event.metaKey : event.ctrlKey) name = "Ctrl-" + name;
michael@0:     if (flipCtrlCmd ? event.ctrlKey : event.metaKey) name = "Cmd-" + name;
michael@0:     if (!noShift && event.shiftKey) name = "Shift-" + name;
michael@0:     return name;
michael@0:   };
michael@0: 
michael@0:   // FROMTEXTAREA
michael@0: 
michael@0:   CodeMirror.fromTextArea = function(textarea, options) {
michael@0:     if (!options) options = {};
michael@0:     options.value = textarea.value;
michael@0:     if (!options.tabindex && textarea.tabindex)
michael@0:       options.tabindex = textarea.tabindex;
michael@0:     if (!options.placeholder && textarea.placeholder)
michael@0:       options.placeholder = textarea.placeholder;
michael@0:     // Set autofocus to true if this textarea is focused, or if it has
michael@0:     // autofocus and no other element is focused.
michael@0:     if (options.autofocus == null) {
michael@0:       var hasFocus = activeElt();
michael@0:       options.autofocus = hasFocus == textarea ||
michael@0:         textarea.getAttribute("autofocus") != null && hasFocus == document.body;
michael@0:     }
michael@0: 
michael@0:     function save() {textarea.value = cm.getValue();}
michael@0:     if (textarea.form) {
michael@0:       on(textarea.form, "submit", save);
michael@0:       // Deplorable hack to make the submit method do the right thing.
michael@0:       if (!options.leaveSubmitMethodAlone) {
michael@0:         var form = textarea.form, realSubmit = form.submit;
michael@0:         try {
michael@0:           var wrappedSubmit = form.submit = function() {
michael@0:             save();
michael@0:             form.submit = realSubmit;
michael@0:             form.submit();
michael@0:             form.submit = wrappedSubmit;
michael@0:           };
michael@0:         } catch(e) {}
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     textarea.style.display = "none";
michael@0:     var cm = CodeMirror(function(node) {
michael@0:       textarea.parentNode.insertBefore(node, textarea.nextSibling);
michael@0:     }, options);
michael@0:     cm.save = save;
michael@0:     cm.getTextArea = function() { return textarea; };
michael@0:     cm.toTextArea = function() {
michael@0:       save();
michael@0:       textarea.parentNode.removeChild(cm.getWrapperElement());
michael@0:       textarea.style.display = "";
michael@0:       if (textarea.form) {
michael@0:         off(textarea.form, "submit", save);
michael@0:         if (typeof textarea.form.submit == "function")
michael@0:           textarea.form.submit = realSubmit;
michael@0:       }
michael@0:     };
michael@0:     return cm;
michael@0:   };
michael@0: 
michael@0:   // STRING STREAM
michael@0: 
michael@0:   // Fed to the mode parsers, provides helper functions to make
michael@0:   // parsers more succinct.
michael@0: 
michael@0:   var StringStream = CodeMirror.StringStream = function(string, tabSize) {
michael@0:     this.pos = this.start = 0;
michael@0:     this.string = string;
michael@0:     this.tabSize = tabSize || 8;
michael@0:     this.lastColumnPos = this.lastColumnValue = 0;
michael@0:     this.lineStart = 0;
michael@0:   };
michael@0: 
michael@0:   StringStream.prototype = {
michael@0:     eol: function() {return this.pos >= this.string.length;},
michael@0:     sol: function() {return this.pos == this.lineStart;},
michael@0:     peek: function() {return this.string.charAt(this.pos) || undefined;},
michael@0:     next: function() {
michael@0:       if (this.pos < this.string.length)
michael@0:         return this.string.charAt(this.pos++);
michael@0:     },
michael@0:     eat: function(match) {
michael@0:       var ch = this.string.charAt(this.pos);
michael@0:       if (typeof match == "string") var ok = ch == match;
michael@0:       else var ok = ch && (match.test ? match.test(ch) : match(ch));
michael@0:       if (ok) {++this.pos; return ch;}
michael@0:     },
michael@0:     eatWhile: function(match) {
michael@0:       var start = this.pos;
michael@0:       while (this.eat(match)){}
michael@0:       return this.pos > start;
michael@0:     },
michael@0:     eatSpace: function() {
michael@0:       var start = this.pos;
michael@0:       while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
michael@0:       return this.pos > start;
michael@0:     },
michael@0:     skipToEnd: function() {this.pos = this.string.length;},
michael@0:     skipTo: function(ch) {
michael@0:       var found = this.string.indexOf(ch, this.pos);
michael@0:       if (found > -1) {this.pos = found; return true;}
michael@0:     },
michael@0:     backUp: function(n) {this.pos -= n;},
michael@0:     column: function() {
michael@0:       if (this.lastColumnPos < this.start) {
michael@0:         this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
michael@0:         this.lastColumnPos = this.start;
michael@0:       }
michael@0:       return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0);
michael@0:     },
michael@0:     indentation: function() {
michael@0:       return countColumn(this.string, null, this.tabSize) -
michael@0:         (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0);
michael@0:     },
michael@0:     match: function(pattern, consume, caseInsensitive) {
michael@0:       if (typeof pattern == "string") {
michael@0:         var cased = function(str) {return caseInsensitive ? str.toLowerCase() : str;};
michael@0:         var substr = this.string.substr(this.pos, pattern.length);
michael@0:         if (cased(substr) == cased(pattern)) {
michael@0:           if (consume !== false) this.pos += pattern.length;
michael@0:           return true;
michael@0:         }
michael@0:       } else {
michael@0:         var match = this.string.slice(this.pos).match(pattern);
michael@0:         if (match && match.index > 0) return null;
michael@0:         if (match && consume !== false) this.pos += match[0].length;
michael@0:         return match;
michael@0:       }
michael@0:     },
michael@0:     current: function(){return this.string.slice(this.start, this.pos);},
michael@0:     hideFirstChars: function(n, inner) {
michael@0:       this.lineStart += n;
michael@0:       try { return inner(); }
michael@0:       finally { this.lineStart -= n; }
michael@0:     }
michael@0:   };
michael@0: 
michael@0:   // TEXTMARKERS
michael@0: 
michael@0:   // Created with markText and setBookmark methods. A TextMarker is a
michael@0:   // handle that can be used to clear or find a marked position in the
michael@0:   // document. Line objects hold arrays (markedSpans) containing
michael@0:   // {from, to, marker} object pointing to such marker objects, and
michael@0:   // indicating that such a marker is present on that line. Multiple
michael@0:   // lines may point to the same marker when it spans across lines.
michael@0:   // The spans will have null for their from/to properties when the
michael@0:   // marker continues beyond the start/end of the line. Markers have
michael@0:   // links back to the lines they currently touch.
michael@0: 
michael@0:   var TextMarker = CodeMirror.TextMarker = function(doc, type) {
michael@0:     this.lines = [];
michael@0:     this.type = type;
michael@0:     this.doc = doc;
michael@0:   };
michael@0:   eventMixin(TextMarker);
michael@0: 
michael@0:   // Clear the marker.
michael@0:   TextMarker.prototype.clear = function() {
michael@0:     if (this.explicitlyCleared) return;
michael@0:     var cm = this.doc.cm, withOp = cm && !cm.curOp;
michael@0:     if (withOp) startOperation(cm);
michael@0:     if (hasHandler(this, "clear")) {
michael@0:       var found = this.find();
michael@0:       if (found) signalLater(this, "clear", found.from, found.to);
michael@0:     }
michael@0:     var min = null, max = null;
michael@0:     for (var i = 0; i < this.lines.length; ++i) {
michael@0:       var line = this.lines[i];
michael@0:       var span = getMarkedSpanFor(line.markedSpans, this);
michael@0:       if (cm && !this.collapsed) regLineChange(cm, lineNo(line), "text");
michael@0:       else if (cm) {
michael@0:         if (span.to != null) max = lineNo(line);
michael@0:         if (span.from != null) min = lineNo(line);
michael@0:       }
michael@0:       line.markedSpans = removeMarkedSpan(line.markedSpans, span);
michael@0:       if (span.from == null && this.collapsed && !lineIsHidden(this.doc, line) && cm)
michael@0:         updateLineHeight(line, textHeight(cm.display));
michael@0:     }
michael@0:     if (cm && this.collapsed && !cm.options.lineWrapping) for (var i = 0; i < this.lines.length; ++i) {
michael@0:       var visual = visualLine(this.lines[i]), len = lineLength(visual);
michael@0:       if (len > cm.display.maxLineLength) {
michael@0:         cm.display.maxLine = visual;
michael@0:         cm.display.maxLineLength = len;
michael@0:         cm.display.maxLineChanged = true;
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     if (min != null && cm && this.collapsed) regChange(cm, min, max + 1);
michael@0:     this.lines.length = 0;
michael@0:     this.explicitlyCleared = true;
michael@0:     if (this.atomic && this.doc.cantEdit) {
michael@0:       this.doc.cantEdit = false;
michael@0:       if (cm) reCheckSelection(cm.doc);
michael@0:     }
michael@0:     if (cm) signalLater(cm, "markerCleared", cm, this);
michael@0:     if (withOp) endOperation(cm);
michael@0:   };
michael@0: 
michael@0:   // Find the position of the marker in the document. Returns a {from,
michael@0:   // to} object by default. Side can be passed to get a specific side
michael@0:   // -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
michael@0:   // Pos objects returned contain a line object, rather than a line
michael@0:   // number (used to prevent looking up the same line twice).
michael@0:   TextMarker.prototype.find = function(side, lineObj) {
michael@0:     if (side == null && this.type == "bookmark") side = 1;
michael@0:     var from, to;
michael@0:     for (var i = 0; i < this.lines.length; ++i) {
michael@0:       var line = this.lines[i];
michael@0:       var span = getMarkedSpanFor(line.markedSpans, this);
michael@0:       if (span.from != null) {
michael@0:         from = Pos(lineObj ? line : lineNo(line), span.from);
michael@0:         if (side == -1) return from;
michael@0:       }
michael@0:       if (span.to != null) {
michael@0:         to = Pos(lineObj ? line : lineNo(line), span.to);
michael@0:         if (side == 1) return to;
michael@0:       }
michael@0:     }
michael@0:     return from && {from: from, to: to};
michael@0:   };
michael@0: 
michael@0:   // Signals that the marker's widget changed, and surrounding layout
michael@0:   // should be recomputed.
michael@0:   TextMarker.prototype.changed = function() {
michael@0:     var pos = this.find(-1, true), widget = this, cm = this.doc.cm;
michael@0:     if (!pos || !cm) return;
michael@0:     runInOp(cm, function() {
michael@0:       var line = pos.line, lineN = lineNo(pos.line);
michael@0:       var view = findViewForLine(cm, lineN);
michael@0:       if (view) {
michael@0:         clearLineMeasurementCacheFor(view);
michael@0:         cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;
michael@0:       }
michael@0:       cm.curOp.updateMaxLine = true;
michael@0:       if (!lineIsHidden(widget.doc, line) && widget.height != null) {
michael@0:         var oldHeight = widget.height;
michael@0:         widget.height = null;
michael@0:         var dHeight = widgetHeight(widget) - oldHeight;
michael@0:         if (dHeight)
michael@0:           updateLineHeight(line, line.height + dHeight);
michael@0:       }
michael@0:     });
michael@0:   };
michael@0: 
michael@0:   TextMarker.prototype.attachLine = function(line) {
michael@0:     if (!this.lines.length && this.doc.cm) {
michael@0:       var op = this.doc.cm.curOp;
michael@0:       if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)
michael@0:         (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this);
michael@0:     }
michael@0:     this.lines.push(line);
michael@0:   };
michael@0:   TextMarker.prototype.detachLine = function(line) {
michael@0:     this.lines.splice(indexOf(this.lines, line), 1);
michael@0:     if (!this.lines.length && this.doc.cm) {
michael@0:       var op = this.doc.cm.curOp;
michael@0:       (op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
michael@0:     }
michael@0:   };
michael@0: 
michael@0:   // Collapsed markers have unique ids, in order to be able to order
michael@0:   // them, which is needed for uniquely determining an outer marker
michael@0:   // when they overlap (they may nest, but not partially overlap).
michael@0:   var nextMarkerId = 0;
michael@0: 
michael@0:   // Create a marker, wire it up to the right lines, and
michael@0:   function markText(doc, from, to, options, type) {
michael@0:     // Shared markers (across linked documents) are handled separately
michael@0:     // (markTextShared will call out to this again, once per
michael@0:     // document).
michael@0:     if (options && options.shared) return markTextShared(doc, from, to, options, type);
michael@0:     // Ensure we are in an operation.
michael@0:     if (doc.cm && !doc.cm.curOp) return operation(doc.cm, markText)(doc, from, to, options, type);
michael@0: 
michael@0:     var marker = new TextMarker(doc, type), diff = cmp(from, to);
michael@0:     if (options) copyObj(options, marker);
michael@0:     // Don't connect empty markers unless clearWhenEmpty is false
michael@0:     if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false)
michael@0:       return marker;
michael@0:     if (marker.replacedWith) {
michael@0:       // Showing up as a widget implies collapsed (widget replaces text)
michael@0:       marker.collapsed = true;
michael@0:       marker.widgetNode = elt("span", [marker.replacedWith], "CodeMirror-widget");
michael@0:       if (!options.handleMouseEvents) marker.widgetNode.ignoreEvents = true;
michael@0:       if (options.insertLeft) marker.widgetNode.insertLeft = true;
michael@0:     }
michael@0:     if (marker.collapsed) {
michael@0:       if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||
michael@0:           from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker))
michael@0:         throw new Error("Inserting collapsed marker partially overlapping an existing one");
michael@0:       sawCollapsedSpans = true;
michael@0:     }
michael@0: 
michael@0:     if (marker.addToHistory)
michael@0:       addChangeToHistory(doc, {from: from, to: to, origin: "markText"}, doc.sel, NaN);
michael@0: 
michael@0:     var curLine = from.line, cm = doc.cm, updateMaxLine;
michael@0:     doc.iter(curLine, to.line + 1, function(line) {
michael@0:       if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine)
michael@0:         updateMaxLine = true;
michael@0:       if (marker.collapsed && curLine != from.line) updateLineHeight(line, 0);
michael@0:       addMarkedSpan(line, new MarkedSpan(marker,
michael@0:                                          curLine == from.line ? from.ch : null,
michael@0:                                          curLine == to.line ? to.ch : null));
michael@0:       ++curLine;
michael@0:     });
michael@0:     // lineIsHidden depends on the presence of the spans, so needs a second pass
michael@0:     if (marker.collapsed) doc.iter(from.line, to.line + 1, function(line) {
michael@0:       if (lineIsHidden(doc, line)) updateLineHeight(line, 0);
michael@0:     });
michael@0: 
michael@0:     if (marker.clearOnEnter) on(marker, "beforeCursorEnter", function() { marker.clear(); });
michael@0: 
michael@0:     if (marker.readOnly) {
michael@0:       sawReadOnlySpans = true;
michael@0:       if (doc.history.done.length || doc.history.undone.length)
michael@0:         doc.clearHistory();
michael@0:     }
michael@0:     if (marker.collapsed) {
michael@0:       marker.id = ++nextMarkerId;
michael@0:       marker.atomic = true;
michael@0:     }
michael@0:     if (cm) {
michael@0:       // Sync editor state
michael@0:       if (updateMaxLine) cm.curOp.updateMaxLine = true;
michael@0:       if (marker.collapsed)
michael@0:         regChange(cm, from.line, to.line + 1);
michael@0:       else if (marker.className || marker.title || marker.startStyle || marker.endStyle)
michael@0:         for (var i = from.line; i <= to.line; i++) regLineChange(cm, i, "text");
michael@0:       if (marker.atomic) reCheckSelection(cm.doc);
michael@0:       signalLater(cm, "markerAdded", cm, marker);
michael@0:     }
michael@0:     return marker;
michael@0:   }
michael@0: 
michael@0:   // SHARED TEXTMARKERS
michael@0: 
michael@0:   // A shared marker spans multiple linked documents. It is
michael@0:   // implemented as a meta-marker-object controlling multiple normal
michael@0:   // markers.
michael@0:   var SharedTextMarker = CodeMirror.SharedTextMarker = function(markers, primary) {
michael@0:     this.markers = markers;
michael@0:     this.primary = primary;
michael@0:     for (var i = 0, me = this; i < markers.length; ++i) {
michael@0:       markers[i].parent = this;
michael@0:       on(markers[i], "clear", function(){me.clear();});
michael@0:     }
michael@0:   };
michael@0:   eventMixin(SharedTextMarker);
michael@0: 
michael@0:   SharedTextMarker.prototype.clear = function() {
michael@0:     if (this.explicitlyCleared) return;
michael@0:     this.explicitlyCleared = true;
michael@0:     for (var i = 0; i < this.markers.length; ++i)
michael@0:       this.markers[i].clear();
michael@0:     signalLater(this, "clear");
michael@0:   };
michael@0:   SharedTextMarker.prototype.find = function(side, lineObj) {
michael@0:     return this.primary.find(side, lineObj);
michael@0:   };
michael@0: 
michael@0:   function markTextShared(doc, from, to, options, type) {
michael@0:     options = copyObj(options);
michael@0:     options.shared = false;
michael@0:     var markers = [markText(doc, from, to, options, type)], primary = markers[0];
michael@0:     var widget = options.widgetNode;
michael@0:     linkedDocs(doc, function(doc) {
michael@0:       if (widget) options.widgetNode = widget.cloneNode(true);
michael@0:       markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
michael@0:       for (var i = 0; i < doc.linked.length; ++i)
michael@0:         if (doc.linked[i].isParent) return;
michael@0:       primary = lst(markers);
michael@0:     });
michael@0:     return new SharedTextMarker(markers, primary);
michael@0:   }
michael@0: 
michael@0:   // TEXTMARKER SPANS
michael@0: 
michael@0:   function MarkedSpan(marker, from, to) {
michael@0:     this.marker = marker;
michael@0:     this.from = from; this.to = to;
michael@0:   }
michael@0: 
michael@0:   // Search an array of spans for a span matching the given marker.
michael@0:   function getMarkedSpanFor(spans, marker) {
michael@0:     if (spans) for (var i = 0; i < spans.length; ++i) {
michael@0:       var span = spans[i];
michael@0:       if (span.marker == marker) return span;
michael@0:     }
michael@0:   }
michael@0:   // Remove a span from an array, returning undefined if no spans are
michael@0:   // left (we don't store arrays for lines without spans).
michael@0:   function removeMarkedSpan(spans, span) {
michael@0:     for (var r, i = 0; i < spans.length; ++i)
michael@0:       if (spans[i] != span) (r || (r = [])).push(spans[i]);
michael@0:     return r;
michael@0:   }
michael@0:   // Add a span to a line.
michael@0:   function addMarkedSpan(line, span) {
michael@0:     line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
michael@0:     span.marker.attachLine(line);
michael@0:   }
michael@0: 
michael@0:   // Used for the algorithm that adjusts markers for a change in the
michael@0:   // document. These functions cut an array of spans at a given
michael@0:   // character position, returning an array of remaining chunks (or
michael@0:   // undefined if nothing remains).
michael@0:   function markedSpansBefore(old, startCh, isInsert) {
michael@0:     if (old) for (var i = 0, nw; i < old.length; ++i) {
michael@0:       var span = old[i], marker = span.marker;
michael@0:       var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
michael@0:       if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {
michael@0:         var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh);
michael@0:         (nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to));
michael@0:       }
michael@0:     }
michael@0:     return nw;
michael@0:   }
michael@0:   function markedSpansAfter(old, endCh, isInsert) {
michael@0:     if (old) for (var i = 0, nw; i < old.length; ++i) {
michael@0:       var span = old[i], marker = span.marker;
michael@0:       var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
michael@0:       if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {
michael@0:         var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh);
michael@0:         (nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,
michael@0:                                               span.to == null ? null : span.to - endCh));
michael@0:       }
michael@0:     }
michael@0:     return nw;
michael@0:   }
michael@0: 
michael@0:   // Given a change object, compute the new set of marker spans that
michael@0:   // cover the line in which the change took place. Removes spans
michael@0:   // entirely within the change, reconnects spans belonging to the
michael@0:   // same marker that appear on both sides of the change, and cuts off
michael@0:   // spans partially within the change. Returns an array of span
michael@0:   // arrays with one element for each line in (after) the change.
michael@0:   function stretchSpansOverChange(doc, change) {
michael@0:     var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
michael@0:     var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
michael@0:     if (!oldFirst && !oldLast) return null;
michael@0: 
michael@0:     var startCh = change.from.ch, endCh = change.to.ch, isInsert = cmp(change.from, change.to) == 0;
michael@0:     // Get the spans that 'stick out' on both sides
michael@0:     var first = markedSpansBefore(oldFirst, startCh, isInsert);
michael@0:     var last = markedSpansAfter(oldLast, endCh, isInsert);
michael@0: 
michael@0:     // Next, merge those two ends
michael@0:     var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);
michael@0:     if (first) {
michael@0:       // Fix up .to properties of first
michael@0:       for (var i = 0; i < first.length; ++i) {
michael@0:         var span = first[i];
michael@0:         if (span.to == null) {
michael@0:           var found = getMarkedSpanFor(last, span.marker);
michael@0:           if (!found) span.to = startCh;
michael@0:           else if (sameLine) span.to = found.to == null ? null : found.to + offset;
michael@0:         }
michael@0:       }
michael@0:     }
michael@0:     if (last) {
michael@0:       // Fix up .from in last (or move them into first in case of sameLine)
michael@0:       for (var i = 0; i < last.length; ++i) {
michael@0:         var span = last[i];
michael@0:         if (span.to != null) span.to += offset;
michael@0:         if (span.from == null) {
michael@0:           var found = getMarkedSpanFor(first, span.marker);
michael@0:           if (!found) {
michael@0:             span.from = offset;
michael@0:             if (sameLine) (first || (first = [])).push(span);
michael@0:           }
michael@0:         } else {
michael@0:           span.from += offset;
michael@0:           if (sameLine) (first || (first = [])).push(span);
michael@0:         }
michael@0:       }
michael@0:     }
michael@0:     // Make sure we didn't create any zero-length spans
michael@0:     if (first) first = clearEmptySpans(first);
michael@0:     if (last && last != first) last = clearEmptySpans(last);
michael@0: 
michael@0:     var newMarkers = [first];
michael@0:     if (!sameLine) {
michael@0:       // Fill gap with whole-line-spans
michael@0:       var gap = change.text.length - 2, gapMarkers;
michael@0:       if (gap > 0 && first)
michael@0:         for (var i = 0; i < first.length; ++i)
michael@0:           if (first[i].to == null)
michael@0:             (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i].marker, null, null));
michael@0:       for (var i = 0; i < gap; ++i)
michael@0:         newMarkers.push(gapMarkers);
michael@0:       newMarkers.push(last);
michael@0:     }
michael@0:     return newMarkers;
michael@0:   }
michael@0: 
michael@0:   // Remove spans that are empty and don't have a clearWhenEmpty
michael@0:   // option of false.
michael@0:   function clearEmptySpans(spans) {
michael@0:     for (var i = 0; i < spans.length; ++i) {
michael@0:       var span = spans[i];
michael@0:       if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false)
michael@0:         spans.splice(i--, 1);
michael@0:     }
michael@0:     if (!spans.length) return null;
michael@0:     return spans;
michael@0:   }
michael@0: 
michael@0:   // Used for un/re-doing changes from the history. Combines the
michael@0:   // result of computing the existing spans with the set of spans that
michael@0:   // existed in the history (so that deleting around a span and then
michael@0:   // undoing brings back the span).
michael@0:   function mergeOldSpans(doc, change) {
michael@0:     var old = getOldSpans(doc, change);
michael@0:     var stretched = stretchSpansOverChange(doc, change);
michael@0:     if (!old) return stretched;
michael@0:     if (!stretched) return old;
michael@0: 
michael@0:     for (var i = 0; i < old.length; ++i) {
michael@0:       var oldCur = old[i], stretchCur = stretched[i];
michael@0:       if (oldCur && stretchCur) {
michael@0:         spans: for (var j = 0; j < stretchCur.length; ++j) {
michael@0:           var span = stretchCur[j];
michael@0:           for (var k = 0; k < oldCur.length; ++k)
michael@0:             if (oldCur[k].marker == span.marker) continue spans;
michael@0:           oldCur.push(span);
michael@0:         }
michael@0:       } else if (stretchCur) {
michael@0:         old[i] = stretchCur;
michael@0:       }
michael@0:     }
michael@0:     return old;
michael@0:   }
michael@0: 
michael@0:   // Used to 'clip' out readOnly ranges when making a change.
michael@0:   function removeReadOnlyRanges(doc, from, to) {
michael@0:     var markers = null;
michael@0:     doc.iter(from.line, to.line + 1, function(line) {
michael@0:       if (line.markedSpans) for (var i = 0; i < line.markedSpans.length; ++i) {
michael@0:         var mark = line.markedSpans[i].marker;
michael@0:         if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))
michael@0:           (markers || (markers = [])).push(mark);
michael@0:       }
michael@0:     });
michael@0:     if (!markers) return null;
michael@0:     var parts = [{from: from, to: to}];
michael@0:     for (var i = 0; i < markers.length; ++i) {
michael@0:       var mk = markers[i], m = mk.find(0);
michael@0:       for (var j = 0; j < parts.length; ++j) {
michael@0:         var p = parts[j];
michael@0:         if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) continue;
michael@0:         var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to);
michael@0:         if (dfrom < 0 || !mk.inclusiveLeft && !dfrom)
michael@0:           newParts.push({from: p.from, to: m.from});
michael@0:         if (dto > 0 || !mk.inclusiveRight && !dto)
michael@0:           newParts.push({from: m.to, to: p.to});
michael@0:         parts.splice.apply(parts, newParts);
michael@0:         j += newParts.length - 1;
michael@0:       }
michael@0:     }
michael@0:     return parts;
michael@0:   }
michael@0: 
michael@0:   // Connect or disconnect spans from a line.
michael@0:   function detachMarkedSpans(line) {
michael@0:     var spans = line.markedSpans;
michael@0:     if (!spans) return;
michael@0:     for (var i = 0; i < spans.length; ++i)
michael@0:       spans[i].marker.detachLine(line);
michael@0:     line.markedSpans = null;
michael@0:   }
michael@0:   function attachMarkedSpans(line, spans) {
michael@0:     if (!spans) return;
michael@0:     for (var i = 0; i < spans.length; ++i)
michael@0:       spans[i].marker.attachLine(line);
michael@0:     line.markedSpans = spans;
michael@0:   }
michael@0: 
michael@0:   // Helpers used when computing which overlapping collapsed span
michael@0:   // counts as the larger one.
michael@0:   function extraLeft(marker) { return marker.inclusiveLeft ? -1 : 0; }
michael@0:   function extraRight(marker) { return marker.inclusiveRight ? 1 : 0; }
michael@0: 
michael@0:   // Returns a number indicating which of two overlapping collapsed
michael@0:   // spans is larger (and thus includes the other). Falls back to
michael@0:   // comparing ids when the spans cover exactly the same range.
michael@0:   function compareCollapsedMarkers(a, b) {
michael@0:     var lenDiff = a.lines.length - b.lines.length;
michael@0:     if (lenDiff != 0) return lenDiff;
michael@0:     var aPos = a.find(), bPos = b.find();
michael@0:     var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);
michael@0:     if (fromCmp) return -fromCmp;
michael@0:     var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);
michael@0:     if (toCmp) return toCmp;
michael@0:     return b.id - a.id;
michael@0:   }
michael@0: 
michael@0:   // Find out whether a line ends or starts in a collapsed span. If
michael@0:   // so, return the marker for that span.
michael@0:   function collapsedSpanAtSide(line, start) {
michael@0:     var sps = sawCollapsedSpans && line.markedSpans, found;
michael@0:     if (sps) for (var sp, i = 0; i < sps.length; ++i) {
michael@0:       sp = sps[i];
michael@0:       if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&
michael@0:           (!found || compareCollapsedMarkers(found, sp.marker) < 0))
michael@0:         found = sp.marker;
michael@0:     }
michael@0:     return found;
michael@0:   }
michael@0:   function collapsedSpanAtStart(line) { return collapsedSpanAtSide(line, true); }
michael@0:   function collapsedSpanAtEnd(line) { return collapsedSpanAtSide(line, false); }
michael@0: 
michael@0:   // Test whether there exists a collapsed span that partially
michael@0:   // overlaps (covers the start or end, but not both) of a new span.
michael@0:   // Such overlap is not allowed.
michael@0:   function conflictingCollapsedRange(doc, lineNo, from, to, marker) {
michael@0:     var line = getLine(doc, lineNo);
michael@0:     var sps = sawCollapsedSpans && line.markedSpans;
michael@0:     if (sps) for (var i = 0; i < sps.length; ++i) {
michael@0:       var sp = sps[i];
michael@0:       if (!sp.marker.collapsed) continue;
michael@0:       var found = sp.marker.find(0);
michael@0:       var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);
michael@0:       var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);
michael@0:       if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) continue;
michael@0:       if (fromCmp <= 0 && (cmp(found.to, from) || extraRight(sp.marker) - extraLeft(marker)) > 0 ||
michael@0:           fromCmp >= 0 && (cmp(found.from, to) || extraLeft(sp.marker) - extraRight(marker)) < 0)
michael@0:         return true;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // A visual line is a line as drawn on the screen. Folding, for
michael@0:   // example, can cause multiple logical lines to appear on the same
michael@0:   // visual line. This finds the start of the visual line that the
michael@0:   // given line is part of (usually that is the line itself).
michael@0:   function visualLine(line) {
michael@0:     var merged;
michael@0:     while (merged = collapsedSpanAtStart(line))
michael@0:       line = merged.find(-1, true).line;
michael@0:     return line;
michael@0:   }
michael@0: 
michael@0:   // Returns an array of logical lines that continue the visual line
michael@0:   // started by the argument, or undefined if there are no such lines.
michael@0:   function visualLineContinued(line) {
michael@0:     var merged, lines;
michael@0:     while (merged = collapsedSpanAtEnd(line)) {
michael@0:       line = merged.find(1, true).line;
michael@0:       (lines || (lines = [])).push(line);
michael@0:     }
michael@0:     return lines;
michael@0:   }
michael@0: 
michael@0:   // Get the line number of the start of the visual line that the
michael@0:   // given line number is part of.
michael@0:   function visualLineNo(doc, lineN) {
michael@0:     var line = getLine(doc, lineN), vis = visualLine(line);
michael@0:     if (line == vis) return lineN;
michael@0:     return lineNo(vis);
michael@0:   }
michael@0:   // Get the line number of the start of the next visual line after
michael@0:   // the given line.
michael@0:   function visualLineEndNo(doc, lineN) {
michael@0:     if (lineN > doc.lastLine()) return lineN;
michael@0:     var line = getLine(doc, lineN), merged;
michael@0:     if (!lineIsHidden(doc, line)) return lineN;
michael@0:     while (merged = collapsedSpanAtEnd(line))
michael@0:       line = merged.find(1, true).line;
michael@0:     return lineNo(line) + 1;
michael@0:   }
michael@0: 
michael@0:   // Compute whether a line is hidden. Lines count as hidden when they
michael@0:   // are part of a visual line that starts with another line, or when
michael@0:   // they are entirely covered by collapsed, non-widget span.
michael@0:   function lineIsHidden(doc, line) {
michael@0:     var sps = sawCollapsedSpans && line.markedSpans;
michael@0:     if (sps) for (var sp, i = 0; i < sps.length; ++i) {
michael@0:       sp = sps[i];
michael@0:       if (!sp.marker.collapsed) continue;
michael@0:       if (sp.from == null) return true;
michael@0:       if (sp.marker.widgetNode) continue;
michael@0:       if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))
michael@0:         return true;
michael@0:     }
michael@0:   }
michael@0:   function lineIsHiddenInner(doc, line, span) {
michael@0:     if (span.to == null) {
michael@0:       var end = span.marker.find(1, true);
michael@0:       return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker));
michael@0:     }
michael@0:     if (span.marker.inclusiveRight && span.to == line.text.length)
michael@0:       return true;
michael@0:     for (var sp, i = 0; i < line.markedSpans.length; ++i) {
michael@0:       sp = line.markedSpans[i];
michael@0:       if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&
michael@0:           (sp.to == null || sp.to != span.from) &&
michael@0:           (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
michael@0:           lineIsHiddenInner(doc, line, sp)) return true;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // LINE WIDGETS
michael@0: 
michael@0:   // Line widgets are block elements displayed above or below a line.
michael@0: 
michael@0:   var LineWidget = CodeMirror.LineWidget = function(cm, node, options) {
michael@0:     if (options) for (var opt in options) if (options.hasOwnProperty(opt))
michael@0:       this[opt] = options[opt];
michael@0:     this.cm = cm;
michael@0:     this.node = node;
michael@0:   };
michael@0:   eventMixin(LineWidget);
michael@0: 
michael@0:   function adjustScrollWhenAboveVisible(cm, line, diff) {
michael@0:     if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop))
michael@0:       addToScrollPos(cm, null, diff);
michael@0:   }
michael@0: 
michael@0:   LineWidget.prototype.clear = function() {
michael@0:     var cm = this.cm, ws = this.line.widgets, line = this.line, no = lineNo(line);
michael@0:     if (no == null || !ws) return;
michael@0:     for (var i = 0; i < ws.length; ++i) if (ws[i] == this) ws.splice(i--, 1);
michael@0:     if (!ws.length) line.widgets = null;
michael@0:     var height = widgetHeight(this);
michael@0:     runInOp(cm, function() {
michael@0:       adjustScrollWhenAboveVisible(cm, line, -height);
michael@0:       regLineChange(cm, no, "widget");
michael@0:       updateLineHeight(line, Math.max(0, line.height - height));
michael@0:     });
michael@0:   };
michael@0:   LineWidget.prototype.changed = function() {
michael@0:     var oldH = this.height, cm = this.cm, line = this.line;
michael@0:     this.height = null;
michael@0:     var diff = widgetHeight(this) - oldH;
michael@0:     if (!diff) return;
michael@0:     runInOp(cm, function() {
michael@0:       cm.curOp.forceUpdate = true;
michael@0:       adjustScrollWhenAboveVisible(cm, line, diff);
michael@0:       updateLineHeight(line, line.height + diff);
michael@0:     });
michael@0:   };
michael@0: 
michael@0:   function widgetHeight(widget) {
michael@0:     if (widget.height != null) return widget.height;
michael@0:     if (!contains(document.body, widget.node))
michael@0:       removeChildrenAndAdd(widget.cm.display.measure, elt("div", [widget.node], null, "position: relative"));
michael@0:     return widget.height = widget.node.offsetHeight;
michael@0:   }
michael@0: 
michael@0:   function addLineWidget(cm, handle, node, options) {
michael@0:     var widget = new LineWidget(cm, node, options);
michael@0:     if (widget.noHScroll) cm.display.alignWidgets = true;
michael@0:     changeLine(cm, handle, "widget", function(line) {
michael@0:       var widgets = line.widgets || (line.widgets = []);
michael@0:       if (widget.insertAt == null) widgets.push(widget);
michael@0:       else widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget);
michael@0:       widget.line = line;
michael@0:       if (!lineIsHidden(cm.doc, line)) {
michael@0:         var aboveVisible = heightAtLine(line) < cm.doc.scrollTop;
michael@0:         updateLineHeight(line, line.height + widgetHeight(widget));
michael@0:         if (aboveVisible) addToScrollPos(cm, null, widget.height);
michael@0:         cm.curOp.forceUpdate = true;
michael@0:       }
michael@0:       return true;
michael@0:     });
michael@0:     return widget;
michael@0:   }
michael@0: 
michael@0:   // LINE DATA STRUCTURE
michael@0: 
michael@0:   // Line objects. These hold state related to a line, including
michael@0:   // highlighting info (the styles array).
michael@0:   var Line = CodeMirror.Line = function(text, markedSpans, estimateHeight) {
michael@0:     this.text = text;
michael@0:     attachMarkedSpans(this, markedSpans);
michael@0:     this.height = estimateHeight ? estimateHeight(this) : 1;
michael@0:   };
michael@0:   eventMixin(Line);
michael@0:   Line.prototype.lineNo = function() { return lineNo(this); };
michael@0: 
michael@0:   // Change the content (text, markers) of a line. Automatically
michael@0:   // invalidates cached information and tries to re-estimate the
michael@0:   // line's height.
michael@0:   function updateLine(line, text, markedSpans, estimateHeight) {
michael@0:     line.text = text;
michael@0:     if (line.stateAfter) line.stateAfter = null;
michael@0:     if (line.styles) line.styles = null;
michael@0:     if (line.order != null) line.order = null;
michael@0:     detachMarkedSpans(line);
michael@0:     attachMarkedSpans(line, markedSpans);
michael@0:     var estHeight = estimateHeight ? estimateHeight(line) : 1;
michael@0:     if (estHeight != line.height) updateLineHeight(line, estHeight);
michael@0:   }
michael@0: 
michael@0:   // Detach a line from the document tree and its markers.
michael@0:   function cleanUpLine(line) {
michael@0:     line.parent = null;
michael@0:     detachMarkedSpans(line);
michael@0:   }
michael@0: 
michael@0:   // Run the given mode's parser over a line, calling f for each token.
michael@0:   function runMode(cm, text, mode, state, f, forceToEnd) {
michael@0:     var flattenSpans = mode.flattenSpans;
michael@0:     if (flattenSpans == null) flattenSpans = cm.options.flattenSpans;
michael@0:     var curStart = 0, curStyle = null;
michael@0:     var stream = new StringStream(text, cm.options.tabSize), style;
michael@0:     if (text == "" && mode.blankLine) mode.blankLine(state);
michael@0:     while (!stream.eol()) {
michael@0:       if (stream.pos > cm.options.maxHighlightLength) {
michael@0:         flattenSpans = false;
michael@0:         if (forceToEnd) processLine(cm, text, state, stream.pos);
michael@0:         stream.pos = text.length;
michael@0:         style = null;
michael@0:       } else {
michael@0:         style = mode.token(stream, state);
michael@0:       }
michael@0:       if (cm.options.addModeClass) {
michael@0:         var mName = CodeMirror.innerMode(mode, state).mode.name;
michael@0:         if (mName) style = "m-" + (style ? mName + " " + style : mName);
michael@0:       }
michael@0:       if (!flattenSpans || curStyle != style) {
michael@0:         if (curStart < stream.start) f(stream.start, curStyle);
michael@0:         curStart = stream.start; curStyle = style;
michael@0:       }
michael@0:       stream.start = stream.pos;
michael@0:     }
michael@0:     while (curStart < stream.pos) {
michael@0:       // Webkit seems to refuse to render text nodes longer than 57444 characters
michael@0:       var pos = Math.min(stream.pos, curStart + 50000);
michael@0:       f(pos, curStyle);
michael@0:       curStart = pos;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Compute a style array (an array starting with a mode generation
michael@0:   // -- for invalidation -- followed by pairs of end positions and
michael@0:   // style strings), which is used to highlight the tokens on the
michael@0:   // line.
michael@0:   function highlightLine(cm, line, state, forceToEnd) {
michael@0:     // A styles array always starts with a number identifying the
michael@0:     // mode/overlays that it is based on (for easy invalidation).
michael@0:     var st = [cm.state.modeGen];
michael@0:     // Compute the base array of styles
michael@0:     runMode(cm, line.text, cm.doc.mode, state, function(end, style) {
michael@0:       st.push(end, style);
michael@0:     }, forceToEnd);
michael@0: 
michael@0:     // Run overlays, adjust style array.
michael@0:     for (var o = 0; o < cm.state.overlays.length; ++o) {
michael@0:       var overlay = cm.state.overlays[o], i = 1, at = 0;
michael@0:       runMode(cm, line.text, overlay.mode, true, function(end, style) {
michael@0:         var start = i;
michael@0:         // Ensure there's a token end at the current position, and that i points at it
michael@0:         while (at < end) {
michael@0:           var i_end = st[i];
michael@0:           if (i_end > end)
michael@0:             st.splice(i, 1, end, st[i+1], i_end);
michael@0:           i += 2;
michael@0:           at = Math.min(end, i_end);
michael@0:         }
michael@0:         if (!style) return;
michael@0:         if (overlay.opaque) {
michael@0:           st.splice(start, i - start, end, style);
michael@0:           i = start + 2;
michael@0:         } else {
michael@0:           for (; start < i; start += 2) {
michael@0:             var cur = st[start+1];
michael@0:             st[start+1] = cur ? cur + " " + style : style;
michael@0:           }
michael@0:         }
michael@0:       });
michael@0:     }
michael@0: 
michael@0:     return st;
michael@0:   }
michael@0: 
michael@0:   function getLineStyles(cm, line) {
michael@0:     if (!line.styles || line.styles[0] != cm.state.modeGen)
michael@0:       line.styles = highlightLine(cm, line, line.stateAfter = getStateBefore(cm, lineNo(line)));
michael@0:     return line.styles;
michael@0:   }
michael@0: 
michael@0:   // Lightweight form of highlight -- proceed over this line and
michael@0:   // update state, but don't save a style array. Used for lines that
michael@0:   // aren't currently visible.
michael@0:   function processLine(cm, text, state, startAt) {
michael@0:     var mode = cm.doc.mode;
michael@0:     var stream = new StringStream(text, cm.options.tabSize);
michael@0:     stream.start = stream.pos = startAt || 0;
michael@0:     if (text == "" && mode.blankLine) mode.blankLine(state);
michael@0:     while (!stream.eol() && stream.pos <= cm.options.maxHighlightLength) {
michael@0:       mode.token(stream, state);
michael@0:       stream.start = stream.pos;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Convert a style as returned by a mode (either null, or a string
michael@0:   // containing one or more styles) to a CSS style. This is cached,
michael@0:   // and also looks for line-wide styles.
michael@0:   var styleToClassCache = {}, styleToClassCacheWithMode = {};
michael@0:   function interpretTokenStyle(style, builder) {
michael@0:     if (!style) return null;
michael@0:     for (;;) {
michael@0:       var lineClass = style.match(/(?:^|\s+)line-(background-)?(\S+)/);
michael@0:       if (!lineClass) break;
michael@0:       style = style.slice(0, lineClass.index) + style.slice(lineClass.index + lineClass[0].length);
michael@0:       var prop = lineClass[1] ? "bgClass" : "textClass";
michael@0:       if (builder[prop] == null)
michael@0:         builder[prop] = lineClass[2];
michael@0:       else if (!(new RegExp("(?:^|\s)" + lineClass[2] + "(?:$|\s)")).test(builder[prop]))
michael@0:         builder[prop] += " " + lineClass[2];
michael@0:     }
michael@0:     if (/^\s*$/.test(style)) return null;
michael@0:     var cache = builder.cm.options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;
michael@0:     return cache[style] ||
michael@0:       (cache[style] = style.replace(/\S+/g, "cm-$&"));
michael@0:   }
michael@0: 
michael@0:   // Render the DOM representation of the text of a line. Also builds
michael@0:   // up a 'line map', which points at the DOM nodes that represent
michael@0:   // specific stretches of text, and is used by the measuring code.
michael@0:   // The returned object contains the DOM node, this map, and
michael@0:   // information about line-wide styles that were set by the mode.
michael@0:   function buildLineContent(cm, lineView) {
michael@0:     // The padding-right forces the element to have a 'border', which
michael@0:     // is needed on Webkit to be able to get line-level bounding
michael@0:     // rectangles for it (in measureChar).
michael@0:     var content = elt("span", null, null, webkit ? "padding-right: .1px" : null);
michael@0:     var builder = {pre: elt("pre", [content]), content: content, col: 0, pos: 0, cm: cm};
michael@0:     lineView.measure = {};
michael@0: 
michael@0:     // Iterate over the logical lines that make up this visual line.
michael@0:     for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
michael@0:       var line = i ? lineView.rest[i - 1] : lineView.line, order;
michael@0:       builder.pos = 0;
michael@0:       builder.addToken = buildToken;
michael@0:       // Optionally wire in some hacks into the token-rendering
michael@0:       // algorithm, to deal with browser quirks.
michael@0:       if ((ie || webkit) && cm.getOption("lineWrapping"))
michael@0:         builder.addToken = buildTokenSplitSpaces(builder.addToken);
michael@0:       if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line)))
michael@0:         builder.addToken = buildTokenBadBidi(builder.addToken, order);
michael@0:       builder.map = [];
michael@0:       insertLineContent(line, builder, getLineStyles(cm, line));
michael@0: 
michael@0:       // Ensure at least a single node is present, for measuring.
michael@0:       if (builder.map.length == 0)
michael@0:         builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure)));
michael@0: 
michael@0:       // Store the map and a cache object for the current logical line
michael@0:       if (i == 0) {
michael@0:         lineView.measure.map = builder.map;
michael@0:         lineView.measure.cache = {};
michael@0:       } else {
michael@0:         (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map);
michael@0:         (lineView.measure.caches || (lineView.measure.caches = [])).push({});
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     signal(cm, "renderLine", cm, lineView.line, builder.pre);
michael@0:     return builder;
michael@0:   }
michael@0: 
michael@0:   function defaultSpecialCharPlaceholder(ch) {
michael@0:     var token = elt("span", "\u2022", "cm-invalidchar");
michael@0:     token.title = "\\u" + ch.charCodeAt(0).toString(16);
michael@0:     return token;
michael@0:   }
michael@0: 
michael@0:   // Build up the DOM representation for a single token, and add it to
michael@0:   // the line map. Takes care to render special characters separately.
michael@0:   function buildToken(builder, text, style, startStyle, endStyle, title) {
michael@0:     if (!text) return;
michael@0:     var special = builder.cm.options.specialChars, mustWrap = false;
michael@0:     if (!special.test(text)) {
michael@0:       builder.col += text.length;
michael@0:       var content = document.createTextNode(text);
michael@0:       builder.map.push(builder.pos, builder.pos + text.length, content);
michael@0:       if (ie_upto8) mustWrap = true;
michael@0:       builder.pos += text.length;
michael@0:     } else {
michael@0:       var content = document.createDocumentFragment(), pos = 0;
michael@0:       while (true) {
michael@0:         special.lastIndex = pos;
michael@0:         var m = special.exec(text);
michael@0:         var skipped = m ? m.index - pos : text.length - pos;
michael@0:         if (skipped) {
michael@0:           var txt = document.createTextNode(text.slice(pos, pos + skipped));
michael@0:           if (ie_upto8) content.appendChild(elt("span", [txt]));
michael@0:           else content.appendChild(txt);
michael@0:           builder.map.push(builder.pos, builder.pos + skipped, txt);
michael@0:           builder.col += skipped;
michael@0:           builder.pos += skipped;
michael@0:         }
michael@0:         if (!m) break;
michael@0:         pos += skipped + 1;
michael@0:         if (m[0] == "\t") {
michael@0:           var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
michael@0:           var txt = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
michael@0:           builder.col += tabWidth;
michael@0:         } else {
michael@0:           var txt = builder.cm.options.specialCharPlaceholder(m[0]);
michael@0:           if (ie_upto8) content.appendChild(elt("span", [txt]));
michael@0:           else content.appendChild(txt);
michael@0:           builder.col += 1;
michael@0:         }
michael@0:         builder.map.push(builder.pos, builder.pos + 1, txt);
michael@0:         builder.pos++;
michael@0:       }
michael@0:     }
michael@0:     if (style || startStyle || endStyle || mustWrap) {
michael@0:       var fullStyle = style || "";
michael@0:       if (startStyle) fullStyle += startStyle;
michael@0:       if (endStyle) fullStyle += endStyle;
michael@0:       var token = elt("span", [content], fullStyle);
michael@0:       if (title) token.title = title;
michael@0:       return builder.content.appendChild(token);
michael@0:     }
michael@0:     builder.content.appendChild(content);
michael@0:   }
michael@0: 
michael@0:   function buildTokenSplitSpaces(inner) {
michael@0:     function split(old) {
michael@0:       var out = " ";
michael@0:       for (var i = 0; i < old.length - 2; ++i) out += i % 2 ? " " : "\u00a0";
michael@0:       out += " ";
michael@0:       return out;
michael@0:     }
michael@0:     return function(builder, text, style, startStyle, endStyle, title) {
michael@0:       inner(builder, text.replace(/ {3,}/g, split), style, startStyle, endStyle, title);
michael@0:     };
michael@0:   }
michael@0: 
michael@0:   // Work around nonsense dimensions being reported for stretches of
michael@0:   // right-to-left text.
michael@0:   function buildTokenBadBidi(inner, order) {
michael@0:     return function(builder, text, style, startStyle, endStyle, title) {
michael@0:       style = style ? style + " cm-force-border" : "cm-force-border";
michael@0:       var start = builder.pos, end = start + text.length;
michael@0:       for (;;) {
michael@0:         // Find the part that overlaps with the start of this text
michael@0:         for (var i = 0; i < order.length; i++) {
michael@0:           var part = order[i];
michael@0:           if (part.to > start && part.from <= start) break;
michael@0:         }
michael@0:         if (part.to >= end) return inner(builder, text, style, startStyle, endStyle, title);
michael@0:         inner(builder, text.slice(0, part.to - start), style, startStyle, null, title);
michael@0:         startStyle = null;
michael@0:         text = text.slice(part.to - start);
michael@0:         start = part.to;
michael@0:       }
michael@0:     };
michael@0:   }
michael@0: 
michael@0:   function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
michael@0:     var widget = !ignoreWidget && marker.widgetNode;
michael@0:     if (widget) {
michael@0:       builder.map.push(builder.pos, builder.pos + size, widget);
michael@0:       builder.content.appendChild(widget);
michael@0:     }
michael@0:     builder.pos += size;
michael@0:   }
michael@0: 
michael@0:   // Outputs a number of spans to make up a line, taking highlighting
michael@0:   // and marked text into account.
michael@0:   function insertLineContent(line, builder, styles) {
michael@0:     var spans = line.markedSpans, allText = line.text, at = 0;
michael@0:     if (!spans) {
michael@0:       for (var i = 1; i < styles.length; i+=2)
michael@0:         builder.addToken(builder, allText.slice(at, at = styles[i]), interpretTokenStyle(styles[i+1], builder));
michael@0:       return;
michael@0:     }
michael@0: 
michael@0:     var len = allText.length, pos = 0, i = 1, text = "", style;
michael@0:     var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, title, collapsed;
michael@0:     for (;;) {
michael@0:       if (nextChange == pos) { // Update current marker set
michael@0:         spanStyle = spanEndStyle = spanStartStyle = title = "";
michael@0:         collapsed = null; nextChange = Infinity;
michael@0:         var foundBookmarks = [];
michael@0:         for (var j = 0; j < spans.length; ++j) {
michael@0:           var sp = spans[j], m = sp.marker;
michael@0:           if (sp.from <= pos && (sp.to == null || sp.to > pos)) {
michael@0:             if (sp.to != null && nextChange > sp.to) { nextChange = sp.to; spanEndStyle = ""; }
michael@0:             if (m.className) spanStyle += " " + m.className;
michael@0:             if (m.startStyle && sp.from == pos) spanStartStyle += " " + m.startStyle;
michael@0:             if (m.endStyle && sp.to == nextChange) spanEndStyle += " " + m.endStyle;
michael@0:             if (m.title && !title) title = m.title;
michael@0:             if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0))
michael@0:               collapsed = sp;
michael@0:           } else if (sp.from > pos && nextChange > sp.from) {
michael@0:             nextChange = sp.from;
michael@0:           }
michael@0:           if (m.type == "bookmark" && sp.from == pos && m.widgetNode) foundBookmarks.push(m);
michael@0:         }
michael@0:         if (collapsed && (collapsed.from || 0) == pos) {
michael@0:           buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
michael@0:                              collapsed.marker, collapsed.from == null);
michael@0:           if (collapsed.to == null) return;
michael@0:         }
michael@0:         if (!collapsed && foundBookmarks.length) for (var j = 0; j < foundBookmarks.length; ++j)
michael@0:           buildCollapsedSpan(builder, 0, foundBookmarks[j]);
michael@0:       }
michael@0:       if (pos >= len) break;
michael@0: 
michael@0:       var upto = Math.min(len, nextChange);
michael@0:       while (true) {
michael@0:         if (text) {
michael@0:           var end = pos + text.length;
michael@0:           if (!collapsed) {
michael@0:             var tokenText = end > upto ? text.slice(0, upto - pos) : text;
michael@0:             builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
michael@0:                              spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", title);
michael@0:           }
michael@0:           if (end >= upto) {text = text.slice(upto - pos); pos = upto; break;}
michael@0:           pos = end;
michael@0:           spanStartStyle = "";
michael@0:         }
michael@0:         text = allText.slice(at, at = styles[i++]);
michael@0:         style = interpretTokenStyle(styles[i++], builder);
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // DOCUMENT DATA STRUCTURE
michael@0: 
michael@0:   // By default, updates that start and end at the beginning of a line
michael@0:   // are treated specially, in order to make the association of line
michael@0:   // widgets and marker elements with the text behave more intuitive.
michael@0:   function isWholeLineUpdate(doc, change) {
michael@0:     return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
michael@0:       (!doc.cm || doc.cm.options.wholeLineUpdateBefore);
michael@0:   }
michael@0: 
michael@0:   // Perform a change on the document data structure.
michael@0:   function updateDoc(doc, change, markedSpans, estimateHeight) {
michael@0:     function spansFor(n) {return markedSpans ? markedSpans[n] : null;}
michael@0:     function update(line, text, spans) {
michael@0:       updateLine(line, text, spans, estimateHeight);
michael@0:       signalLater(line, "change", line, change);
michael@0:     }
michael@0: 
michael@0:     var from = change.from, to = change.to, text = change.text;
michael@0:     var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);
michael@0:     var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;
michael@0: 
michael@0:     // Adjust the line structure
michael@0:     if (isWholeLineUpdate(doc, change)) {
michael@0:       // This is a whole-line replace. Treated specially to make
michael@0:       // sure line objects move the way they are supposed to.
michael@0:       for (var i = 0, added = []; i < text.length - 1; ++i)
michael@0:         added.push(new Line(text[i], spansFor(i), estimateHeight));
michael@0:       update(lastLine, lastLine.text, lastSpans);
michael@0:       if (nlines) doc.remove(from.line, nlines);
michael@0:       if (added.length) doc.insert(from.line, added);
michael@0:     } else if (firstLine == lastLine) {
michael@0:       if (text.length == 1) {
michael@0:         update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
michael@0:       } else {
michael@0:         for (var added = [], i = 1; i < text.length - 1; ++i)
michael@0:           added.push(new Line(text[i], spansFor(i), estimateHeight));
michael@0:         added.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight));
michael@0:         update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
michael@0:         doc.insert(from.line + 1, added);
michael@0:       }
michael@0:     } else if (text.length == 1) {
michael@0:       update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
michael@0:       doc.remove(from.line + 1, nlines);
michael@0:     } else {
michael@0:       update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
michael@0:       update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
michael@0:       for (var i = 1, added = []; i < text.length - 1; ++i)
michael@0:         added.push(new Line(text[i], spansFor(i), estimateHeight));
michael@0:       if (nlines > 1) doc.remove(from.line + 1, nlines - 1);
michael@0:       doc.insert(from.line + 1, added);
michael@0:     }
michael@0: 
michael@0:     signalLater(doc, "change", doc, change);
michael@0:   }
michael@0: 
michael@0:   // The document is represented as a BTree consisting of leaves, with
michael@0:   // chunk of lines in them, and branches, with up to ten leaves or
michael@0:   // other branch nodes below them. The top node is always a branch
michael@0:   // node, and is the document object itself (meaning it has
michael@0:   // additional methods and properties).
michael@0:   //
michael@0:   // All nodes have parent links. The tree is used both to go from
michael@0:   // line numbers to line objects, and to go from objects to numbers.
michael@0:   // It also indexes by height, and is used to convert between height
michael@0:   // and line object, and to find the total height of the document.
michael@0:   //
michael@0:   // See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html
michael@0: 
michael@0:   function LeafChunk(lines) {
michael@0:     this.lines = lines;
michael@0:     this.parent = null;
michael@0:     for (var i = 0, height = 0; i < lines.length; ++i) {
michael@0:       lines[i].parent = this;
michael@0:       height += lines[i].height;
michael@0:     }
michael@0:     this.height = height;
michael@0:   }
michael@0: 
michael@0:   LeafChunk.prototype = {
michael@0:     chunkSize: function() { return this.lines.length; },
michael@0:     // Remove the n lines at offset 'at'.
michael@0:     removeInner: function(at, n) {
michael@0:       for (var i = at, e = at + n; i < e; ++i) {
michael@0:         var line = this.lines[i];
michael@0:         this.height -= line.height;
michael@0:         cleanUpLine(line);
michael@0:         signalLater(line, "delete");
michael@0:       }
michael@0:       this.lines.splice(at, n);
michael@0:     },
michael@0:     // Helper used to collapse a small branch into a single leaf.
michael@0:     collapse: function(lines) {
michael@0:       lines.push.apply(lines, this.lines);
michael@0:     },
michael@0:     // Insert the given array of lines at offset 'at', count them as
michael@0:     // having the given height.
michael@0:     insertInner: function(at, lines, height) {
michael@0:       this.height += height;
michael@0:       this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
michael@0:       for (var i = 0; i < lines.length; ++i) lines[i].parent = this;
michael@0:     },
michael@0:     // Used to iterate over a part of the tree.
michael@0:     iterN: function(at, n, op) {
michael@0:       for (var e = at + n; at < e; ++at)
michael@0:         if (op(this.lines[at])) return true;
michael@0:     }
michael@0:   };
michael@0: 
michael@0:   function BranchChunk(children) {
michael@0:     this.children = children;
michael@0:     var size = 0, height = 0;
michael@0:     for (var i = 0; i < children.length; ++i) {
michael@0:       var ch = children[i];
michael@0:       size += ch.chunkSize(); height += ch.height;
michael@0:       ch.parent = this;
michael@0:     }
michael@0:     this.size = size;
michael@0:     this.height = height;
michael@0:     this.parent = null;
michael@0:   }
michael@0: 
michael@0:   BranchChunk.prototype = {
michael@0:     chunkSize: function() { return this.size; },
michael@0:     removeInner: function(at, n) {
michael@0:       this.size -= n;
michael@0:       for (var i = 0; i < this.children.length; ++i) {
michael@0:         var child = this.children[i], sz = child.chunkSize();
michael@0:         if (at < sz) {
michael@0:           var rm = Math.min(n, sz - at), oldHeight = child.height;
michael@0:           child.removeInner(at, rm);
michael@0:           this.height -= oldHeight - child.height;
michael@0:           if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }
michael@0:           if ((n -= rm) == 0) break;
michael@0:           at = 0;
michael@0:         } else at -= sz;
michael@0:       }
michael@0:       // If the result is smaller than 25 lines, ensure that it is a
michael@0:       // single leaf node.
michael@0:       if (this.size - n < 25 &&
michael@0:           (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {
michael@0:         var lines = [];
michael@0:         this.collapse(lines);
michael@0:         this.children = [new LeafChunk(lines)];
michael@0:         this.children[0].parent = this;
michael@0:       }
michael@0:     },
michael@0:     collapse: function(lines) {
michael@0:       for (var i = 0; i < this.children.length; ++i) this.children[i].collapse(lines);
michael@0:     },
michael@0:     insertInner: function(at, lines, height) {
michael@0:       this.size += lines.length;
michael@0:       this.height += height;
michael@0:       for (var i = 0; i < this.children.length; ++i) {
michael@0:         var child = this.children[i], sz = child.chunkSize();
michael@0:         if (at <= sz) {
michael@0:           child.insertInner(at, lines, height);
michael@0:           if (child.lines && child.lines.length > 50) {
michael@0:             while (child.lines.length > 50) {
michael@0:               var spilled = child.lines.splice(child.lines.length - 25, 25);
michael@0:               var newleaf = new LeafChunk(spilled);
michael@0:               child.height -= newleaf.height;
michael@0:               this.children.splice(i + 1, 0, newleaf);
michael@0:               newleaf.parent = this;
michael@0:             }
michael@0:             this.maybeSpill();
michael@0:           }
michael@0:           break;
michael@0:         }
michael@0:         at -= sz;
michael@0:       }
michael@0:     },
michael@0:     // When a node has grown, check whether it should be split.
michael@0:     maybeSpill: function() {
michael@0:       if (this.children.length <= 10) return;
michael@0:       var me = this;
michael@0:       do {
michael@0:         var spilled = me.children.splice(me.children.length - 5, 5);
michael@0:         var sibling = new BranchChunk(spilled);
michael@0:         if (!me.parent) { // Become the parent node
michael@0:           var copy = new BranchChunk(me.children);
michael@0:           copy.parent = me;
michael@0:           me.children = [copy, sibling];
michael@0:           me = copy;
michael@0:         } else {
michael@0:           me.size -= sibling.size;
michael@0:           me.height -= sibling.height;
michael@0:           var myIndex = indexOf(me.parent.children, me);
michael@0:           me.parent.children.splice(myIndex + 1, 0, sibling);
michael@0:         }
michael@0:         sibling.parent = me.parent;
michael@0:       } while (me.children.length > 10);
michael@0:       me.parent.maybeSpill();
michael@0:     },
michael@0:     iterN: function(at, n, op) {
michael@0:       for (var i = 0; i < this.children.length; ++i) {
michael@0:         var child = this.children[i], sz = child.chunkSize();
michael@0:         if (at < sz) {
michael@0:           var used = Math.min(n, sz - at);
michael@0:           if (child.iterN(at, used, op)) return true;
michael@0:           if ((n -= used) == 0) break;
michael@0:           at = 0;
michael@0:         } else at -= sz;
michael@0:       }
michael@0:     }
michael@0:   };
michael@0: 
michael@0:   var nextDocId = 0;
michael@0:   var Doc = CodeMirror.Doc = function(text, mode, firstLine) {
michael@0:     if (!(this instanceof Doc)) return new Doc(text, mode, firstLine);
michael@0:     if (firstLine == null) firstLine = 0;
michael@0: 
michael@0:     BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
michael@0:     this.first = firstLine;
michael@0:     this.scrollTop = this.scrollLeft = 0;
michael@0:     this.cantEdit = false;
michael@0:     this.cleanGeneration = 1;
michael@0:     this.frontier = firstLine;
michael@0:     var start = Pos(firstLine, 0);
michael@0:     this.sel = simpleSelection(start);
michael@0:     this.history = new History(null);
michael@0:     this.id = ++nextDocId;
michael@0:     this.modeOption = mode;
michael@0: 
michael@0:     if (typeof text == "string") text = splitLines(text);
michael@0:     updateDoc(this, {from: start, to: start, text: text});
michael@0:     setSelection(this, simpleSelection(start), sel_dontScroll);
michael@0:   };
michael@0: 
michael@0:   Doc.prototype = createObj(BranchChunk.prototype, {
michael@0:     constructor: Doc,
michael@0:     // Iterate over the document. Supports two forms -- with only one
michael@0:     // argument, it calls that for each line in the document. With
michael@0:     // three, it iterates over the range given by the first two (with
michael@0:     // the second being non-inclusive).
michael@0:     iter: function(from, to, op) {
michael@0:       if (op) this.iterN(from - this.first, to - from, op);
michael@0:       else this.iterN(this.first, this.first + this.size, from);
michael@0:     },
michael@0: 
michael@0:     // Non-public interface for adding and removing lines.
michael@0:     insert: function(at, lines) {
michael@0:       var height = 0;
michael@0:       for (var i = 0; i < lines.length; ++i) height += lines[i].height;
michael@0:       this.insertInner(at - this.first, lines, height);
michael@0:     },
michael@0:     remove: function(at, n) { this.removeInner(at - this.first, n); },
michael@0: 
michael@0:     // From here, the methods are part of the public interface. Most
michael@0:     // are also available from CodeMirror (editor) instances.
michael@0: 
michael@0:     getValue: function(lineSep) {
michael@0:       var lines = getLines(this, this.first, this.first + this.size);
michael@0:       if (lineSep === false) return lines;
michael@0:       return lines.join(lineSep || "\n");
michael@0:     },
michael@0:     setValue: docMethodOp(function(code) {
michael@0:       var top = Pos(this.first, 0), last = this.first + this.size - 1;
michael@0:       makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),
michael@0:                         text: splitLines(code), origin: "setValue"}, true);
michael@0:       setSelection(this, simpleSelection(top));
michael@0:     }),
michael@0:     replaceRange: function(code, from, to, origin) {
michael@0:       from = clipPos(this, from);
michael@0:       to = to ? clipPos(this, to) : from;
michael@0:       replaceRange(this, code, from, to, origin);
michael@0:     },
michael@0:     getRange: function(from, to, lineSep) {
michael@0:       var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
michael@0:       if (lineSep === false) return lines;
michael@0:       return lines.join(lineSep || "\n");
michael@0:     },
michael@0: 
michael@0:     getLine: function(line) {var l = this.getLineHandle(line); return l && l.text;},
michael@0: 
michael@0:     getLineHandle: function(line) {if (isLine(this, line)) return getLine(this, line);},
michael@0:     getLineNumber: function(line) {return lineNo(line);},
michael@0: 
michael@0:     getLineHandleVisualStart: function(line) {
michael@0:       if (typeof line == "number") line = getLine(this, line);
michael@0:       return visualLine(line);
michael@0:     },
michael@0: 
michael@0:     lineCount: function() {return this.size;},
michael@0:     firstLine: function() {return this.first;},
michael@0:     lastLine: function() {return this.first + this.size - 1;},
michael@0: 
michael@0:     clipPos: function(pos) {return clipPos(this, pos);},
michael@0: 
michael@0:     getCursor: function(start) {
michael@0:       var range = this.sel.primary(), pos;
michael@0:       if (start == null || start == "head") pos = range.head;
michael@0:       else if (start == "anchor") pos = range.anchor;
michael@0:       else if (start == "end" || start == "to" || start === false) pos = range.to();
michael@0:       else pos = range.from();
michael@0:       return pos;
michael@0:     },
michael@0:     listSelections: function() { return this.sel.ranges; },
michael@0:     somethingSelected: function() {return this.sel.somethingSelected();},
michael@0: 
michael@0:     setCursor: docMethodOp(function(line, ch, options) {
michael@0:       setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options);
michael@0:     }),
michael@0:     setSelection: docMethodOp(function(anchor, head, options) {
michael@0:       setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);
michael@0:     }),
michael@0:     extendSelection: docMethodOp(function(head, other, options) {
michael@0:       extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);
michael@0:     }),
michael@0:     extendSelections: docMethodOp(function(heads, options) {
michael@0:       extendSelections(this, clipPosArray(this, heads, options));
michael@0:     }),
michael@0:     extendSelectionsBy: docMethodOp(function(f, options) {
michael@0:       extendSelections(this, map(this.sel.ranges, f), options);
michael@0:     }),
michael@0:     setSelections: docMethodOp(function(ranges, primary, options) {
michael@0:       if (!ranges.length) return;
michael@0:       for (var i = 0, out = []; i < ranges.length; i++)
michael@0:         out[i] = new Range(clipPos(this, ranges[i].anchor),
michael@0:                            clipPos(this, ranges[i].head));
michael@0:       if (primary == null) primary = Math.min(ranges.length - 1, this.sel.primIndex);
michael@0:       setSelection(this, normalizeSelection(out, primary), options);
michael@0:     }),
michael@0:     addSelection: docMethodOp(function(anchor, head, options) {
michael@0:       var ranges = this.sel.ranges.slice(0);
michael@0:       ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));
michael@0:       setSelection(this, normalizeSelection(ranges, ranges.length - 1), options);
michael@0:     }),
michael@0: 
michael@0:     getSelection: function(lineSep) {
michael@0:       var ranges = this.sel.ranges, lines;
michael@0:       for (var i = 0; i < ranges.length; i++) {
michael@0:         var sel = getBetween(this, ranges[i].from(), ranges[i].to());
michael@0:         lines = lines ? lines.concat(sel) : sel;
michael@0:       }
michael@0:       if (lineSep === false) return lines;
michael@0:       else return lines.join(lineSep || "\n");
michael@0:     },
michael@0:     getSelections: function(lineSep) {
michael@0:       var parts = [], ranges = this.sel.ranges;
michael@0:       for (var i = 0; i < ranges.length; i++) {
michael@0:         var sel = getBetween(this, ranges[i].from(), ranges[i].to());
michael@0:         if (lineSep !== false) sel = sel.join(lineSep || "\n");
michael@0:         parts[i] = sel;
michael@0:       }
michael@0:       return parts;
michael@0:     },
michael@0:     replaceSelection: docMethodOp(function(code, collapse, origin) {
michael@0:       var dup = [];
michael@0:       for (var i = 0; i < this.sel.ranges.length; i++)
michael@0:         dup[i] = code;
michael@0:       this.replaceSelections(dup, collapse, origin || "+input");
michael@0:     }),
michael@0:     replaceSelections: function(code, collapse, origin) {
michael@0:       var changes = [], sel = this.sel;
michael@0:       for (var i = 0; i < sel.ranges.length; i++) {
michael@0:         var range = sel.ranges[i];
michael@0:         changes[i] = {from: range.from(), to: range.to(), text: splitLines(code[i]), origin: origin};
michael@0:       }
michael@0:       var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse);
michael@0:       for (var i = changes.length - 1; i >= 0; i--)
michael@0:         makeChange(this, changes[i]);
michael@0:       if (newSel) setSelectionReplaceHistory(this, newSel);
michael@0:       else if (this.cm) ensureCursorVisible(this.cm);
michael@0:     },
michael@0:     undo: docMethodOp(function() {makeChangeFromHistory(this, "undo");}),
michael@0:     redo: docMethodOp(function() {makeChangeFromHistory(this, "redo");}),
michael@0:     undoSelection: docMethodOp(function() {makeChangeFromHistory(this, "undo", true);}),
michael@0:     redoSelection: docMethodOp(function() {makeChangeFromHistory(this, "redo", true);}),
michael@0: 
michael@0:     setExtending: function(val) {this.extend = val;},
michael@0:     getExtending: function() {return this.extend;},
michael@0: 
michael@0:     historySize: function() {
michael@0:       var hist = this.history, done = 0, undone = 0;
michael@0:       for (var i = 0; i < hist.done.length; i++) if (!hist.done[i].ranges) ++done;
michael@0:       for (var i = 0; i < hist.undone.length; i++) if (!hist.undone[i].ranges) ++undone;
michael@0:       return {undo: done, redo: undone};
michael@0:     },
michael@0:     clearHistory: function() {this.history = new History(this.history.maxGeneration);},
michael@0: 
michael@0:     markClean: function() {
michael@0:       this.cleanGeneration = this.changeGeneration(true);
michael@0:     },
michael@0:     changeGeneration: function(forceSplit) {
michael@0:       if (forceSplit)
michael@0:         this.history.lastOp = this.history.lastOrigin = null;
michael@0:       return this.history.generation;
michael@0:     },
michael@0:     isClean: function (gen) {
michael@0:       return this.history.generation == (gen || this.cleanGeneration);
michael@0:     },
michael@0: 
michael@0:     getHistory: function() {
michael@0:       return {done: copyHistoryArray(this.history.done),
michael@0:               undone: copyHistoryArray(this.history.undone)};
michael@0:     },
michael@0:     setHistory: function(histData) {
michael@0:       var hist = this.history = new History(this.history.maxGeneration);
michael@0:       hist.done = copyHistoryArray(histData.done.slice(0), null, true);
michael@0:       hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);
michael@0:     },
michael@0: 
michael@0:     markText: function(from, to, options) {
michael@0:       return markText(this, clipPos(this, from), clipPos(this, to), options, "range");
michael@0:     },
michael@0:     setBookmark: function(pos, options) {
michael@0:       var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),
michael@0:                       insertLeft: options && options.insertLeft,
michael@0:                       clearWhenEmpty: false, shared: options && options.shared};
michael@0:       pos = clipPos(this, pos);
michael@0:       return markText(this, pos, pos, realOpts, "bookmark");
michael@0:     },
michael@0:     findMarksAt: function(pos) {
michael@0:       pos = clipPos(this, pos);
michael@0:       var markers = [], spans = getLine(this, pos.line).markedSpans;
michael@0:       if (spans) for (var i = 0; i < spans.length; ++i) {
michael@0:         var span = spans[i];
michael@0:         if ((span.from == null || span.from <= pos.ch) &&
michael@0:             (span.to == null || span.to >= pos.ch))
michael@0:           markers.push(span.marker.parent || span.marker);
michael@0:       }
michael@0:       return markers;
michael@0:     },
michael@0:     findMarks: function(from, to) {
michael@0:       from = clipPos(this, from); to = clipPos(this, to);
michael@0:       var found = [], lineNo = from.line;
michael@0:       this.iter(from.line, to.line + 1, function(line) {
michael@0:         var spans = line.markedSpans;
michael@0:         if (spans) for (var i = 0; i < spans.length; i++) {
michael@0:           var span = spans[i];
michael@0:           if (!(lineNo == from.line && from.ch > span.to ||
michael@0:                 span.from == null && lineNo != from.line||
michael@0:                 lineNo == to.line && span.from > to.ch))
michael@0:             found.push(span.marker.parent || span.marker);
michael@0:         }
michael@0:         ++lineNo;
michael@0:       });
michael@0:       return found;
michael@0:     },
michael@0:     getAllMarks: function() {
michael@0:       var markers = [];
michael@0:       this.iter(function(line) {
michael@0:         var sps = line.markedSpans;
michael@0:         if (sps) for (var i = 0; i < sps.length; ++i)
michael@0:           if (sps[i].from != null) markers.push(sps[i].marker);
michael@0:       });
michael@0:       return markers;
michael@0:     },
michael@0: 
michael@0:     posFromIndex: function(off) {
michael@0:       var ch, lineNo = this.first;
michael@0:       this.iter(function(line) {
michael@0:         var sz = line.text.length + 1;
michael@0:         if (sz > off) { ch = off; return true; }
michael@0:         off -= sz;
michael@0:         ++lineNo;
michael@0:       });
michael@0:       return clipPos(this, Pos(lineNo, ch));
michael@0:     },
michael@0:     indexFromPos: function (coords) {
michael@0:       coords = clipPos(this, coords);
michael@0:       var index = coords.ch;
michael@0:       if (coords.line < this.first || coords.ch < 0) return 0;
michael@0:       this.iter(this.first, coords.line, function (line) {
michael@0:         index += line.text.length + 1;
michael@0:       });
michael@0:       return index;
michael@0:     },
michael@0: 
michael@0:     copy: function(copyHistory) {
michael@0:       var doc = new Doc(getLines(this, this.first, this.first + this.size), this.modeOption, this.first);
michael@0:       doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;
michael@0:       doc.sel = this.sel;
michael@0:       doc.extend = false;
michael@0:       if (copyHistory) {
michael@0:         doc.history.undoDepth = this.history.undoDepth;
michael@0:         doc.setHistory(this.getHistory());
michael@0:       }
michael@0:       return doc;
michael@0:     },
michael@0: 
michael@0:     linkedDoc: function(options) {
michael@0:       if (!options) options = {};
michael@0:       var from = this.first, to = this.first + this.size;
michael@0:       if (options.from != null && options.from > from) from = options.from;
michael@0:       if (options.to != null && options.to < to) to = options.to;
michael@0:       var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from);
michael@0:       if (options.sharedHist) copy.history = this.history;
michael@0:       (this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});
michael@0:       copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];
michael@0:       return copy;
michael@0:     },
michael@0:     unlinkDoc: function(other) {
michael@0:       if (other instanceof CodeMirror) other = other.doc;
michael@0:       if (this.linked) for (var i = 0; i < this.linked.length; ++i) {
michael@0:         var link = this.linked[i];
michael@0:         if (link.doc != other) continue;
michael@0:         this.linked.splice(i, 1);
michael@0:         other.unlinkDoc(this);
michael@0:         break;
michael@0:       }
michael@0:       // If the histories were shared, split them again
michael@0:       if (other.history == this.history) {
michael@0:         var splitIds = [other.id];
michael@0:         linkedDocs(other, function(doc) {splitIds.push(doc.id);}, true);
michael@0:         other.history = new History(null);
michael@0:         other.history.done = copyHistoryArray(this.history.done, splitIds);
michael@0:         other.history.undone = copyHistoryArray(this.history.undone, splitIds);
michael@0:       }
michael@0:     },
michael@0:     iterLinkedDocs: function(f) {linkedDocs(this, f);},
michael@0: 
michael@0:     getMode: function() {return this.mode;},
michael@0:     getEditor: function() {return this.cm;}
michael@0:   });
michael@0: 
michael@0:   // Public alias.
michael@0:   Doc.prototype.eachLine = Doc.prototype.iter;
michael@0: 
michael@0:   // Set up methods on CodeMirror's prototype to redirect to the editor's document.
michael@0:   var dontDelegate = "iter insert remove copy getEditor".split(" ");
michael@0:   for (var prop in Doc.prototype) if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)
michael@0:     CodeMirror.prototype[prop] = (function(method) {
michael@0:       return function() {return method.apply(this.doc, arguments);};
michael@0:     })(Doc.prototype[prop]);
michael@0: 
michael@0:   eventMixin(Doc);
michael@0: 
michael@0:   // Call f for all linked documents.
michael@0:   function linkedDocs(doc, f, sharedHistOnly) {
michael@0:     function propagate(doc, skip, sharedHist) {
michael@0:       if (doc.linked) for (var i = 0; i < doc.linked.length; ++i) {
michael@0:         var rel = doc.linked[i];
michael@0:         if (rel.doc == skip) continue;
michael@0:         var shared = sharedHist && rel.sharedHist;
michael@0:         if (sharedHistOnly && !shared) continue;
michael@0:         f(rel.doc, shared);
michael@0:         propagate(rel.doc, doc, shared);
michael@0:       }
michael@0:     }
michael@0:     propagate(doc, null, true);
michael@0:   }
michael@0: 
michael@0:   // Attach a document to an editor.
michael@0:   function attachDoc(cm, doc) {
michael@0:     if (doc.cm) throw new Error("This document is already in use.");
michael@0:     cm.doc = doc;
michael@0:     doc.cm = cm;
michael@0:     estimateLineHeights(cm);
michael@0:     loadMode(cm);
michael@0:     if (!cm.options.lineWrapping) findMaxLine(cm);
michael@0:     cm.options.mode = doc.modeOption;
michael@0:     regChange(cm);
michael@0:   }
michael@0: 
michael@0:   // LINE UTILITIES
michael@0: 
michael@0:   // Find the line object corresponding to the given line number.
michael@0:   function getLine(doc, n) {
michael@0:     n -= doc.first;
michael@0:     if (n < 0 || n >= doc.size) throw new Error("There is no line " + (n + doc.first) + " in the document.");
michael@0:     for (var chunk = doc; !chunk.lines;) {
michael@0:       for (var i = 0;; ++i) {
michael@0:         var child = chunk.children[i], sz = child.chunkSize();
michael@0:         if (n < sz) { chunk = child; break; }
michael@0:         n -= sz;
michael@0:       }
michael@0:     }
michael@0:     return chunk.lines[n];
michael@0:   }
michael@0: 
michael@0:   // Get the part of a document between two positions, as an array of
michael@0:   // strings.
michael@0:   function getBetween(doc, start, end) {
michael@0:     var out = [], n = start.line;
michael@0:     doc.iter(start.line, end.line + 1, function(line) {
michael@0:       var text = line.text;
michael@0:       if (n == end.line) text = text.slice(0, end.ch);
michael@0:       if (n == start.line) text = text.slice(start.ch);
michael@0:       out.push(text);
michael@0:       ++n;
michael@0:     });
michael@0:     return out;
michael@0:   }
michael@0:   // Get the lines between from and to, as array of strings.
michael@0:   function getLines(doc, from, to) {
michael@0:     var out = [];
michael@0:     doc.iter(from, to, function(line) { out.push(line.text); });
michael@0:     return out;
michael@0:   }
michael@0: 
michael@0:   // Update the height of a line, propagating the height change
michael@0:   // upwards to parent nodes.
michael@0:   function updateLineHeight(line, height) {
michael@0:     var diff = height - line.height;
michael@0:     if (diff) for (var n = line; n; n = n.parent) n.height += diff;
michael@0:   }
michael@0: 
michael@0:   // Given a line object, find its line number by walking up through
michael@0:   // its parent links.
michael@0:   function lineNo(line) {
michael@0:     if (line.parent == null) return null;
michael@0:     var cur = line.parent, no = indexOf(cur.lines, line);
michael@0:     for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
michael@0:       for (var i = 0;; ++i) {
michael@0:         if (chunk.children[i] == cur) break;
michael@0:         no += chunk.children[i].chunkSize();
michael@0:       }
michael@0:     }
michael@0:     return no + cur.first;
michael@0:   }
michael@0: 
michael@0:   // Find the line at the given vertical position, using the height
michael@0:   // information in the document tree.
michael@0:   function lineAtHeight(chunk, h) {
michael@0:     var n = chunk.first;
michael@0:     outer: do {
michael@0:       for (var i = 0; i < chunk.children.length; ++i) {
michael@0:         var child = chunk.children[i], ch = child.height;
michael@0:         if (h < ch) { chunk = child; continue outer; }
michael@0:         h -= ch;
michael@0:         n += child.chunkSize();
michael@0:       }
michael@0:       return n;
michael@0:     } while (!chunk.lines);
michael@0:     for (var i = 0; i < chunk.lines.length; ++i) {
michael@0:       var line = chunk.lines[i], lh = line.height;
michael@0:       if (h < lh) break;
michael@0:       h -= lh;
michael@0:     }
michael@0:     return n + i;
michael@0:   }
michael@0: 
michael@0: 
michael@0:   // Find the height above the given line.
michael@0:   function heightAtLine(lineObj) {
michael@0:     lineObj = visualLine(lineObj);
michael@0: 
michael@0:     var h = 0, chunk = lineObj.parent;
michael@0:     for (var i = 0; i < chunk.lines.length; ++i) {
michael@0:       var line = chunk.lines[i];
michael@0:       if (line == lineObj) break;
michael@0:       else h += line.height;
michael@0:     }
michael@0:     for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
michael@0:       for (var i = 0; i < p.children.length; ++i) {
michael@0:         var cur = p.children[i];
michael@0:         if (cur == chunk) break;
michael@0:         else h += cur.height;
michael@0:       }
michael@0:     }
michael@0:     return h;
michael@0:   }
michael@0: 
michael@0:   // Get the bidi ordering for the given line (and cache it). Returns
michael@0:   // false for lines that are fully left-to-right, and an array of
michael@0:   // BidiSpan objects otherwise.
michael@0:   function getOrder(line) {
michael@0:     var order = line.order;
michael@0:     if (order == null) order = line.order = bidiOrdering(line.text);
michael@0:     return order;
michael@0:   }
michael@0: 
michael@0:   // HISTORY
michael@0: 
michael@0:   function History(startGen) {
michael@0:     // Arrays of change events and selections. Doing something adds an
michael@0:     // event to done and clears undo. Undoing moves events from done
michael@0:     // to undone, redoing moves them in the other direction.
michael@0:     this.done = []; this.undone = [];
michael@0:     this.undoDepth = Infinity;
michael@0:     // Used to track when changes can be merged into a single undo
michael@0:     // event
michael@0:     this.lastModTime = this.lastSelTime = 0;
michael@0:     this.lastOp = null;
michael@0:     this.lastOrigin = this.lastSelOrigin = null;
michael@0:     // Used by the isClean() method
michael@0:     this.generation = this.maxGeneration = startGen || 1;
michael@0:   }
michael@0: 
michael@0:   // Create a history change event from an updateDoc-style change
michael@0:   // object.
michael@0:   function historyChangeFromChange(doc, change) {
michael@0:     var histChange = {from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to)};
michael@0:     attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
michael@0:     linkedDocs(doc, function(doc) {attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);}, true);
michael@0:     return histChange;
michael@0:   }
michael@0: 
michael@0:   // Pop all selection events off the end of a history array. Stop at
michael@0:   // a change event.
michael@0:   function clearSelectionEvents(array) {
michael@0:     while (array.length) {
michael@0:       var last = lst(array);
michael@0:       if (last.ranges) array.pop();
michael@0:       else break;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Find the top change event in the history. Pop off selection
michael@0:   // events that are in the way.
michael@0:   function lastChangeEvent(hist, force) {
michael@0:     if (force) {
michael@0:       clearSelectionEvents(hist.done);
michael@0:       return lst(hist.done);
michael@0:     } else if (hist.done.length && !lst(hist.done).ranges) {
michael@0:       return lst(hist.done);
michael@0:     } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
michael@0:       hist.done.pop();
michael@0:       return lst(hist.done);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Register a change in the history. Merges changes that are within
michael@0:   // a single operation, ore are close together with an origin that
michael@0:   // allows merging (starting with "+") into a single event.
michael@0:   function addChangeToHistory(doc, change, selAfter, opId) {
michael@0:     var hist = doc.history;
michael@0:     hist.undone.length = 0;
michael@0:     var time = +new Date, cur;
michael@0: 
michael@0:     if ((hist.lastOp == opId ||
michael@0:          hist.lastOrigin == change.origin && change.origin &&
michael@0:          ((change.origin.charAt(0) == "+" && doc.cm && hist.lastModTime > time - doc.cm.options.historyEventDelay) ||
michael@0:           change.origin.charAt(0) == "*")) &&
michael@0:         (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
michael@0:       // Merge this change into the last event
michael@0:       var last = lst(cur.changes);
michael@0:       if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
michael@0:         // Optimized case for simple insertion -- don't want to add
michael@0:         // new changesets for every character typed
michael@0:         last.to = changeEnd(change);
michael@0:       } else {
michael@0:         // Add new sub-event
michael@0:         cur.changes.push(historyChangeFromChange(doc, change));
michael@0:       }
michael@0:     } else {
michael@0:       // Can not be merged, start a new event.
michael@0:       var before = lst(hist.done);
michael@0:       if (!before || !before.ranges)
michael@0:         pushSelectionToHistory(doc.sel, hist.done);
michael@0:       cur = {changes: [historyChangeFromChange(doc, change)],
michael@0:              generation: hist.generation};
michael@0:       hist.done.push(cur);
michael@0:       while (hist.done.length > hist.undoDepth) {
michael@0:         hist.done.shift();
michael@0:         if (!hist.done[0].ranges) hist.done.shift();
michael@0:       }
michael@0:     }
michael@0:     hist.done.push(selAfter);
michael@0:     hist.generation = ++hist.maxGeneration;
michael@0:     hist.lastModTime = hist.lastSelTime = time;
michael@0:     hist.lastOp = opId;
michael@0:     hist.lastOrigin = hist.lastSelOrigin = change.origin;
michael@0: 
michael@0:     if (!last) signal(doc, "historyAdded");
michael@0:   }
michael@0: 
michael@0:   function selectionEventCanBeMerged(doc, origin, prev, sel) {
michael@0:     var ch = origin.charAt(0);
michael@0:     return ch == "*" ||
michael@0:       ch == "+" &&
michael@0:       prev.ranges.length == sel.ranges.length &&
michael@0:       prev.somethingSelected() == sel.somethingSelected() &&
michael@0:       new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500);
michael@0:   }
michael@0: 
michael@0:   // Called whenever the selection changes, sets the new selection as
michael@0:   // the pending selection in the history, and pushes the old pending
michael@0:   // selection into the 'done' array when it was significantly
michael@0:   // different (in number of selected ranges, emptiness, or time).
michael@0:   function addSelectionToHistory(doc, sel, opId, options) {
michael@0:     var hist = doc.history, origin = options && options.origin;
michael@0: 
michael@0:     // A new event is started when the previous origin does not match
michael@0:     // the current, or the origins don't allow matching. Origins
michael@0:     // starting with * are always merged, those starting with + are
michael@0:     // merged when similar and close together in time.
michael@0:     if (opId == hist.lastOp ||
michael@0:         (origin && hist.lastSelOrigin == origin &&
michael@0:          (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
michael@0:           selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))
michael@0:       hist.done[hist.done.length - 1] = sel;
michael@0:     else
michael@0:       pushSelectionToHistory(sel, hist.done);
michael@0: 
michael@0:     hist.lastSelTime = +new Date;
michael@0:     hist.lastSelOrigin = origin;
michael@0:     hist.lastOp = opId;
michael@0:     if (options && options.clearRedo !== false)
michael@0:       clearSelectionEvents(hist.undone);
michael@0:   }
michael@0: 
michael@0:   function pushSelectionToHistory(sel, dest) {
michael@0:     var top = lst(dest);
michael@0:     if (!(top && top.ranges && top.equals(sel)))
michael@0:       dest.push(sel);
michael@0:   }
michael@0: 
michael@0:   // Used to store marked span information in the history.
michael@0:   function attachLocalSpans(doc, change, from, to) {
michael@0:     var existing = change["spans_" + doc.id], n = 0;
michael@0:     doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function(line) {
michael@0:       if (line.markedSpans)
michael@0:         (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans;
michael@0:       ++n;
michael@0:     });
michael@0:   }
michael@0: 
michael@0:   // When un/re-doing restores text containing marked spans, those
michael@0:   // that have been explicitly cleared should not be restored.
michael@0:   function removeClearedSpans(spans) {
michael@0:     if (!spans) return null;
michael@0:     for (var i = 0, out; i < spans.length; ++i) {
michael@0:       if (spans[i].marker.explicitlyCleared) { if (!out) out = spans.slice(0, i); }
michael@0:       else if (out) out.push(spans[i]);
michael@0:     }
michael@0:     return !out ? spans : out.length ? out : null;
michael@0:   }
michael@0: 
michael@0:   // Retrieve and filter the old marked spans stored in a change event.
michael@0:   function getOldSpans(doc, change) {
michael@0:     var found = change["spans_" + doc.id];
michael@0:     if (!found) return null;
michael@0:     for (var i = 0, nw = []; i < change.text.length; ++i)
michael@0:       nw.push(removeClearedSpans(found[i]));
michael@0:     return nw;
michael@0:   }
michael@0: 
michael@0:   // Used both to provide a JSON-safe object in .getHistory, and, when
michael@0:   // detaching a document, to split the history in two
michael@0:   function copyHistoryArray(events, newGroup, instantiateSel) {
michael@0:     for (var i = 0, copy = []; i < events.length; ++i) {
michael@0:       var event = events[i];
michael@0:       if (event.ranges) {
michael@0:         copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event);
michael@0:         continue;
michael@0:       }
michael@0:       var changes = event.changes, newChanges = [];
michael@0:       copy.push({changes: newChanges});
michael@0:       for (var j = 0; j < changes.length; ++j) {
michael@0:         var change = changes[j], m;
michael@0:         newChanges.push({from: change.from, to: change.to, text: change.text});
michael@0:         if (newGroup) for (var prop in change) if (m = prop.match(/^spans_(\d+)$/)) {
michael@0:           if (indexOf(newGroup, Number(m[1])) > -1) {
michael@0:             lst(newChanges)[prop] = change[prop];
michael@0:             delete change[prop];
michael@0:           }
michael@0:         }
michael@0:       }
michael@0:     }
michael@0:     return copy;
michael@0:   }
michael@0: 
michael@0:   // Rebasing/resetting history to deal with externally-sourced changes
michael@0: 
michael@0:   function rebaseHistSelSingle(pos, from, to, diff) {
michael@0:     if (to < pos.line) {
michael@0:       pos.line += diff;
michael@0:     } else if (from < pos.line) {
michael@0:       pos.line = from;
michael@0:       pos.ch = 0;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // Tries to rebase an array of history events given a change in the
michael@0:   // document. If the change touches the same lines as the event, the
michael@0:   // event, and everything 'behind' it, is discarded. If the change is
michael@0:   // before the event, the event's positions are updated. Uses a
michael@0:   // copy-on-write scheme for the positions, to avoid having to
michael@0:   // reallocate them all on every rebase, but also avoid problems with
michael@0:   // shared position objects being unsafely updated.
michael@0:   function rebaseHistArray(array, from, to, diff) {
michael@0:     for (var i = 0; i < array.length; ++i) {
michael@0:       var sub = array[i], ok = true;
michael@0:       if (sub.ranges) {
michael@0:         if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true; }
michael@0:         for (var j = 0; j < sub.ranges.length; j++) {
michael@0:           rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);
michael@0:           rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);
michael@0:         }
michael@0:         continue;
michael@0:       }
michael@0:       for (var j = 0; j < sub.changes.length; ++j) {
michael@0:         var cur = sub.changes[j];
michael@0:         if (to < cur.from.line) {
michael@0:           cur.from = Pos(cur.from.line + diff, cur.from.ch);
michael@0:           cur.to = Pos(cur.to.line + diff, cur.to.ch);
michael@0:         } else if (from <= cur.to.line) {
michael@0:           ok = false;
michael@0:           break;
michael@0:         }
michael@0:       }
michael@0:       if (!ok) {
michael@0:         array.splice(0, i + 1);
michael@0:         i = 0;
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function rebaseHist(hist, change) {
michael@0:     var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;
michael@0:     rebaseHistArray(hist.done, from, to, diff);
michael@0:     rebaseHistArray(hist.undone, from, to, diff);
michael@0:   }
michael@0: 
michael@0:   // EVENT UTILITIES
michael@0: 
michael@0:   // Due to the fact that we still support jurassic IE versions, some
michael@0:   // compatibility wrappers are needed.
michael@0: 
michael@0:   var e_preventDefault = CodeMirror.e_preventDefault = function(e) {
michael@0:     if (e.preventDefault) e.preventDefault();
michael@0:     else e.returnValue = false;
michael@0:   };
michael@0:   var e_stopPropagation = CodeMirror.e_stopPropagation = function(e) {
michael@0:     if (e.stopPropagation) e.stopPropagation();
michael@0:     else e.cancelBubble = true;
michael@0:   };
michael@0:   function e_defaultPrevented(e) {
michael@0:     return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false;
michael@0:   }
michael@0:   var e_stop = CodeMirror.e_stop = function(e) {e_preventDefault(e); e_stopPropagation(e);};
michael@0: 
michael@0:   function e_target(e) {return e.target || e.srcElement;}
michael@0:   function e_button(e) {
michael@0:     var b = e.which;
michael@0:     if (b == null) {
michael@0:       if (e.button & 1) b = 1;
michael@0:       else if (e.button & 2) b = 3;
michael@0:       else if (e.button & 4) b = 2;
michael@0:     }
michael@0:     if (mac && e.ctrlKey && b == 1) b = 3;
michael@0:     return b;
michael@0:   }
michael@0: 
michael@0:   // EVENT HANDLING
michael@0: 
michael@0:   // Lightweight event framework. on/off also work on DOM nodes,
michael@0:   // registering native DOM handlers.
michael@0: 
michael@0:   var on = CodeMirror.on = function(emitter, type, f) {
michael@0:     if (emitter.addEventListener)
michael@0:       emitter.addEventListener(type, f, false);
michael@0:     else if (emitter.attachEvent)
michael@0:       emitter.attachEvent("on" + type, f);
michael@0:     else {
michael@0:       var map = emitter._handlers || (emitter._handlers = {});
michael@0:       var arr = map[type] || (map[type] = []);
michael@0:       arr.push(f);
michael@0:     }
michael@0:   };
michael@0: 
michael@0:   var off = CodeMirror.off = function(emitter, type, f) {
michael@0:     if (emitter.removeEventListener)
michael@0:       emitter.removeEventListener(type, f, false);
michael@0:     else if (emitter.detachEvent)
michael@0:       emitter.detachEvent("on" + type, f);
michael@0:     else {
michael@0:       var arr = emitter._handlers && emitter._handlers[type];
michael@0:       if (!arr) return;
michael@0:       for (var i = 0; i < arr.length; ++i)
michael@0:         if (arr[i] == f) { arr.splice(i, 1); break; }
michael@0:     }
michael@0:   };
michael@0: 
michael@0:   var signal = CodeMirror.signal = function(emitter, type /*, values...*/) {
michael@0:     var arr = emitter._handlers && emitter._handlers[type];
michael@0:     if (!arr) return;
michael@0:     var args = Array.prototype.slice.call(arguments, 2);
michael@0:     for (var i = 0; i < arr.length; ++i) arr[i].apply(null, args);
michael@0:   };
michael@0: 
michael@0:   // Often, we want to signal events at a point where we are in the
michael@0:   // middle of some work, but don't want the handler to start calling
michael@0:   // other methods on the editor, which might be in an inconsistent
michael@0:   // state or simply not expect any other events to happen.
michael@0:   // signalLater looks whether there are any handlers, and schedules
michael@0:   // them to be executed when the last operation ends, or, if no
michael@0:   // operation is active, when a timeout fires.
michael@0:   var delayedCallbacks, delayedCallbackDepth = 0;
michael@0:   function signalLater(emitter, type /*, values...*/) {
michael@0:     var arr = emitter._handlers && emitter._handlers[type];
michael@0:     if (!arr) return;
michael@0:     var args = Array.prototype.slice.call(arguments, 2);
michael@0:     if (!delayedCallbacks) {
michael@0:       ++delayedCallbackDepth;
michael@0:       delayedCallbacks = [];
michael@0:       setTimeout(fireDelayed, 0);
michael@0:     }
michael@0:     function bnd(f) {return function(){f.apply(null, args);};};
michael@0:     for (var i = 0; i < arr.length; ++i)
michael@0:       delayedCallbacks.push(bnd(arr[i]));
michael@0:   }
michael@0: 
michael@0:   function fireDelayed() {
michael@0:     --delayedCallbackDepth;
michael@0:     var delayed = delayedCallbacks;
michael@0:     delayedCallbacks = null;
michael@0:     for (var i = 0; i < delayed.length; ++i) delayed[i]();
michael@0:   }
michael@0: 
michael@0:   // The DOM events that CodeMirror handles can be overridden by
michael@0:   // registering a (non-DOM) handler on the editor for the event name,
michael@0:   // and preventDefault-ing the event in that handler.
michael@0:   function signalDOMEvent(cm, e, override) {
michael@0:     signal(cm, override || e.type, cm, e);
michael@0:     return e_defaultPrevented(e) || e.codemirrorIgnore;
michael@0:   }
michael@0: 
michael@0:   function hasHandler(emitter, type) {
michael@0:     var arr = emitter._handlers && emitter._handlers[type];
michael@0:     return arr && arr.length > 0;
michael@0:   }
michael@0: 
michael@0:   // Add on and off methods to a constructor's prototype, to make
michael@0:   // registering events on such objects more convenient.
michael@0:   function eventMixin(ctor) {
michael@0:     ctor.prototype.on = function(type, f) {on(this, type, f);};
michael@0:     ctor.prototype.off = function(type, f) {off(this, type, f);};
michael@0:   }
michael@0: 
michael@0:   // MISC UTILITIES
michael@0: 
michael@0:   // Number of pixels added to scroller and sizer to hide scrollbar
michael@0:   var scrollerCutOff = 30;
michael@0: 
michael@0:   // Returned or thrown by various protocols to signal 'I'm not
michael@0:   // handling this'.
michael@0:   var Pass = CodeMirror.Pass = {toString: function(){return "CodeMirror.Pass";}};
michael@0: 
michael@0:   // Reused option objects for setSelection & friends
michael@0:   var sel_dontScroll = {scroll: false}, sel_mouse = {origin: "*mouse"}, sel_move = {origin: "+move"};
michael@0: 
michael@0:   function Delayed() {this.id = null;}
michael@0:   Delayed.prototype.set = function(ms, f) {
michael@0:     clearTimeout(this.id);
michael@0:     this.id = setTimeout(f, ms);
michael@0:   };
michael@0: 
michael@0:   // Counts the column offset in a string, taking tabs into account.
michael@0:   // Used mostly to find indentation.
michael@0:   var countColumn = CodeMirror.countColumn = function(string, end, tabSize, startIndex, startValue) {
michael@0:     if (end == null) {
michael@0:       end = string.search(/[^\s\u00a0]/);
michael@0:       if (end == -1) end = string.length;
michael@0:     }
michael@0:     for (var i = startIndex || 0, n = startValue || 0;;) {
michael@0:       var nextTab = string.indexOf("\t", i);
michael@0:       if (nextTab < 0 || nextTab >= end)
michael@0:         return n + (end - i);
michael@0:       n += nextTab - i;
michael@0:       n += tabSize - (n % tabSize);
michael@0:       i = nextTab + 1;
michael@0:     }
michael@0:   };
michael@0: 
michael@0:   // The inverse of countColumn -- find the offset that corresponds to
michael@0:   // a particular column.
michael@0:   function findColumn(string, goal, tabSize) {
michael@0:     for (var pos = 0, col = 0;;) {
michael@0:       var nextTab = string.indexOf("\t", pos);
michael@0:       if (nextTab == -1) nextTab = string.length;
michael@0:       var skipped = nextTab - pos;
michael@0:       if (nextTab == string.length || col + skipped >= goal)
michael@0:         return pos + Math.min(skipped, goal - col);
michael@0:       col += nextTab - pos;
michael@0:       col += tabSize - (col % tabSize);
michael@0:       pos = nextTab + 1;
michael@0:       if (col >= goal) return pos;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   var spaceStrs = [""];
michael@0:   function spaceStr(n) {
michael@0:     while (spaceStrs.length <= n)
michael@0:       spaceStrs.push(lst(spaceStrs) + " ");
michael@0:     return spaceStrs[n];
michael@0:   }
michael@0: 
michael@0:   function lst(arr) { return arr[arr.length-1]; }
michael@0: 
michael@0:   var selectInput = function(node) { node.select(); };
michael@0:   if (ios) // Mobile Safari apparently has a bug where select() is broken.
michael@0:     selectInput = function(node) { node.selectionStart = 0; node.selectionEnd = node.value.length; };
michael@0:   else if (ie) // Suppress mysterious IE10 errors
michael@0:     selectInput = function(node) { try { node.select(); } catch(_e) {} };
michael@0: 
michael@0:   function indexOf(array, elt) {
michael@0:     for (var i = 0; i < array.length; ++i)
michael@0:       if (array[i] == elt) return i;
michael@0:     return -1;
michael@0:   }
michael@0:   if ([].indexOf) indexOf = function(array, elt) { return array.indexOf(elt); };
michael@0:   function map(array, f) {
michael@0:     var out = [];
michael@0:     for (var i = 0; i < array.length; i++) out[i] = f(array[i], i);
michael@0:     return out;
michael@0:   }
michael@0:   if ([].map) map = function(array, f) { return array.map(f); };
michael@0: 
michael@0:   function createObj(base, props) {
michael@0:     var inst;
michael@0:     if (Object.create) {
michael@0:       inst = Object.create(base);
michael@0:     } else {
michael@0:       var ctor = function() {};
michael@0:       ctor.prototype = base;
michael@0:       inst = new ctor();
michael@0:     }
michael@0:     if (props) copyObj(props, inst);
michael@0:     return inst;
michael@0:   };
michael@0: 
michael@0:   function copyObj(obj, target) {
michael@0:     if (!target) target = {};
michael@0:     for (var prop in obj) if (obj.hasOwnProperty(prop)) target[prop] = obj[prop];
michael@0:     return target;
michael@0:   }
michael@0: 
michael@0:   function bind(f) {
michael@0:     var args = Array.prototype.slice.call(arguments, 1);
michael@0:     return function(){return f.apply(null, args);};
michael@0:   }
michael@0: 
michael@0:   var nonASCIISingleCaseWordChar = /[\u00df\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
michael@0:   var isWordChar = CodeMirror.isWordChar = function(ch) {
michael@0:     return /\w/.test(ch) || ch > "\x80" &&
michael@0:       (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch));
michael@0:   };
michael@0: 
michael@0:   function isEmpty(obj) {
michael@0:     for (var n in obj) if (obj.hasOwnProperty(n) && obj[n]) return false;
michael@0:     return true;
michael@0:   }
michael@0: 
michael@0:   // Extending unicode characters. A series of a non-extending char +
michael@0:   // any number of extending chars is treated as a single unit as far
michael@0:   // as editing and measuring is concerned. This is not fully correct,
michael@0:   // since some scripts/fonts/browsers also treat other configurations
michael@0:   // of code points as a group.
michael@0:   var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/;
michael@0:   function isExtendingChar(ch) { return ch.charCodeAt(0) >= 768 && extendingChars.test(ch); }
michael@0: 
michael@0:   // DOM UTILITIES
michael@0: 
michael@0:   function elt(tag, content, className, style) {
michael@0:     var e = document.createElement(tag);
michael@0:     if (className) e.className = className;
michael@0:     if (style) e.style.cssText = style;
michael@0:     if (typeof content == "string") e.appendChild(document.createTextNode(content));
michael@0:     else if (content) for (var i = 0; i < content.length; ++i) e.appendChild(content[i]);
michael@0:     return e;
michael@0:   }
michael@0: 
michael@0:   var range;
michael@0:   if (document.createRange) range = function(node, start, end) {
michael@0:     var r = document.createRange();
michael@0:     r.setEnd(node, end);
michael@0:     r.setStart(node, start);
michael@0:     return r;
michael@0:   };
michael@0:   else range = function(node, start, end) {
michael@0:     var r = document.body.createTextRange();
michael@0:     r.moveToElementText(node.parentNode);
michael@0:     r.collapse(true);
michael@0:     r.moveEnd("character", end);
michael@0:     r.moveStart("character", start);
michael@0:     return r;
michael@0:   };
michael@0: 
michael@0:   function removeChildren(e) {
michael@0:     for (var count = e.childNodes.length; count > 0; --count)
michael@0:       e.removeChild(e.firstChild);
michael@0:     return e;
michael@0:   }
michael@0: 
michael@0:   function removeChildrenAndAdd(parent, e) {
michael@0:     return removeChildren(parent).appendChild(e);
michael@0:   }
michael@0: 
michael@0:   function contains(parent, child) {
michael@0:     if (parent.contains)
michael@0:       return parent.contains(child);
michael@0:     while (child = child.parentNode)
michael@0:       if (child == parent) return true;
michael@0:   }
michael@0: 
michael@0:   function activeElt() { return document.activeElement; }
michael@0:   // Older versions of IE throws unspecified error when touching
michael@0:   // document.activeElement in some cases (during loading, in iframe)
michael@0:   if (ie_upto10) activeElt = function() {
michael@0:     try { return document.activeElement; }
michael@0:     catch(e) { return document.body; }
michael@0:   };
michael@0: 
michael@0:   // FEATURE DETECTION
michael@0: 
michael@0:   // Detect drag-and-drop
michael@0:   var dragAndDrop = function() {
michael@0:     // There is *some* kind of drag-and-drop support in IE6-8, but I
michael@0:     // couldn't get it to work yet.
michael@0:     if (ie_upto8) return false;
michael@0:     var div = elt('div');
michael@0:     return "draggable" in div || "dragDrop" in div;
michael@0:   }();
michael@0: 
michael@0:   var knownScrollbarWidth;
michael@0:   function scrollbarWidth(measure) {
michael@0:     if (knownScrollbarWidth != null) return knownScrollbarWidth;
michael@0:     var test = elt("div", null, null, "width: 50px; height: 50px; overflow-x: scroll");
michael@0:     removeChildrenAndAdd(measure, test);
michael@0:     if (test.offsetWidth)
michael@0:       knownScrollbarWidth = test.offsetHeight - test.clientHeight;
michael@0:     return knownScrollbarWidth || 0;
michael@0:   }
michael@0: 
michael@0:   var zwspSupported;
michael@0:   function zeroWidthElement(measure) {
michael@0:     if (zwspSupported == null) {
michael@0:       var test = elt("span", "\u200b");
michael@0:       removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
michael@0:       if (measure.firstChild.offsetHeight != 0)
michael@0:         zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !ie_upto7;
michael@0:     }
michael@0:     if (zwspSupported) return elt("span", "\u200b");
michael@0:     else return elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
michael@0:   }
michael@0: 
michael@0:   // Feature-detect IE's crummy client rect reporting for bidi text
michael@0:   var badBidiRects;
michael@0:   function hasBadBidiRects(measure) {
michael@0:     if (badBidiRects != null) return badBidiRects;
michael@0:     var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
michael@0:     var r0 = range(txt, 0, 1).getBoundingClientRect();
michael@0:     if (r0.left == r0.right) return false;
michael@0:     var r1 = range(txt, 1, 2).getBoundingClientRect();
michael@0:     return badBidiRects = (r1.right - r0.right < 3);
michael@0:   }
michael@0: 
michael@0:   // See if "".split is the broken IE version, if so, provide an
michael@0:   // alternative way to split lines.
michael@0:   var splitLines = CodeMirror.splitLines = "\n\nb".split(/\n/).length != 3 ? function(string) {
michael@0:     var pos = 0, result = [], l = string.length;
michael@0:     while (pos <= l) {
michael@0:       var nl = string.indexOf("\n", pos);
michael@0:       if (nl == -1) nl = string.length;
michael@0:       var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
michael@0:       var rt = line.indexOf("\r");
michael@0:       if (rt != -1) {
michael@0:         result.push(line.slice(0, rt));
michael@0:         pos += rt + 1;
michael@0:       } else {
michael@0:         result.push(line);
michael@0:         pos = nl + 1;
michael@0:       }
michael@0:     }
michael@0:     return result;
michael@0:   } : function(string){return string.split(/\r\n?|\n/);};
michael@0: 
michael@0:   var hasSelection = window.getSelection ? function(te) {
michael@0:     try { return te.selectionStart != te.selectionEnd; }
michael@0:     catch(e) { return false; }
michael@0:   } : function(te) {
michael@0:     try {var range = te.ownerDocument.selection.createRange();}
michael@0:     catch(e) {}
michael@0:     if (!range || range.parentElement() != te) return false;
michael@0:     return range.compareEndPoints("StartToEnd", range) != 0;
michael@0:   };
michael@0: 
michael@0:   var hasCopyEvent = (function() {
michael@0:     var e = elt("div");
michael@0:     if ("oncopy" in e) return true;
michael@0:     e.setAttribute("oncopy", "return;");
michael@0:     return typeof e.oncopy == "function";
michael@0:   })();
michael@0: 
michael@0:   // KEY NAMES
michael@0: 
michael@0:   var keyNames = {3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
michael@0:                   19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
michael@0:                   36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
michael@0:                   46: "Delete", 59: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod", 107: "=", 109: "-", 127: "Delete",
michael@0:                   173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
michael@0:                   221: "]", 222: "'", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",
michael@0:                   63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"};
michael@0:   CodeMirror.keyNames = keyNames;
michael@0:   (function() {
michael@0:     // Number keys
michael@0:     for (var i = 0; i < 10; i++) keyNames[i + 48] = keyNames[i + 96] = String(i);
michael@0:     // Alphabetic keys
michael@0:     for (var i = 65; i <= 90; i++) keyNames[i] = String.fromCharCode(i);
michael@0:     // Function keys
michael@0:     for (var i = 1; i <= 12; i++) keyNames[i + 111] = keyNames[i + 63235] = "F" + i;
michael@0:   })();
michael@0: 
michael@0:   // BIDI HELPERS
michael@0: 
michael@0:   function iterateBidiSections(order, from, to, f) {
michael@0:     if (!order) return f(from, to, "ltr");
michael@0:     var found = false;
michael@0:     for (var i = 0; i < order.length; ++i) {
michael@0:       var part = order[i];
michael@0:       if (part.from < to && part.to > from || from == to && part.to == from) {
michael@0:         f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr");
michael@0:         found = true;
michael@0:       }
michael@0:     }
michael@0:     if (!found) f(from, to, "ltr");
michael@0:   }
michael@0: 
michael@0:   function bidiLeft(part) { return part.level % 2 ? part.to : part.from; }
michael@0:   function bidiRight(part) { return part.level % 2 ? part.from : part.to; }
michael@0: 
michael@0:   function lineLeft(line) { var order = getOrder(line); return order ? bidiLeft(order[0]) : 0; }
michael@0:   function lineRight(line) {
michael@0:     var order = getOrder(line);
michael@0:     if (!order) return line.text.length;
michael@0:     return bidiRight(lst(order));
michael@0:   }
michael@0: 
michael@0:   function lineStart(cm, lineN) {
michael@0:     var line = getLine(cm.doc, lineN);
michael@0:     var visual = visualLine(line);
michael@0:     if (visual != line) lineN = lineNo(visual);
michael@0:     var order = getOrder(visual);
michael@0:     var ch = !order ? 0 : order[0].level % 2 ? lineRight(visual) : lineLeft(visual);
michael@0:     return Pos(lineN, ch);
michael@0:   }
michael@0:   function lineEnd(cm, lineN) {
michael@0:     var merged, line = getLine(cm.doc, lineN);
michael@0:     while (merged = collapsedSpanAtEnd(line)) {
michael@0:       line = merged.find(1, true).line;
michael@0:       lineN = null;
michael@0:     }
michael@0:     var order = getOrder(line);
michael@0:     var ch = !order ? line.text.length : order[0].level % 2 ? lineLeft(line) : lineRight(line);
michael@0:     return Pos(lineN == null ? lineNo(line) : lineN, ch);
michael@0:   }
michael@0: 
michael@0:   function compareBidiLevel(order, a, b) {
michael@0:     var linedir = order[0].level;
michael@0:     if (a == linedir) return true;
michael@0:     if (b == linedir) return false;
michael@0:     return a < b;
michael@0:   }
michael@0:   var bidiOther;
michael@0:   function getBidiPartAt(order, pos) {
michael@0:     bidiOther = null;
michael@0:     for (var i = 0, found; i < order.length; ++i) {
michael@0:       var cur = order[i];
michael@0:       if (cur.from < pos && cur.to > pos) return i;
michael@0:       if ((cur.from == pos || cur.to == pos)) {
michael@0:         if (found == null) {
michael@0:           found = i;
michael@0:         } else if (compareBidiLevel(order, cur.level, order[found].level)) {
michael@0:           if (cur.from != cur.to) bidiOther = found;
michael@0:           return i;
michael@0:         } else {
michael@0:           if (cur.from != cur.to) bidiOther = i;
michael@0:           return found;
michael@0:         }
michael@0:       }
michael@0:     }
michael@0:     return found;
michael@0:   }
michael@0: 
michael@0:   function moveInLine(line, pos, dir, byUnit) {
michael@0:     if (!byUnit) return pos + dir;
michael@0:     do pos += dir;
michael@0:     while (pos > 0 && isExtendingChar(line.text.charAt(pos)));
michael@0:     return pos;
michael@0:   }
michael@0: 
michael@0:   // This is needed in order to move 'visually' through bi-directional
michael@0:   // text -- i.e., pressing left should make the cursor go left, even
michael@0:   // when in RTL text. The tricky part is the 'jumps', where RTL and
michael@0:   // LTR text touch each other. This often requires the cursor offset
michael@0:   // to move more than one unit, in order to visually move one unit.
michael@0:   function moveVisually(line, start, dir, byUnit) {
michael@0:     var bidi = getOrder(line);
michael@0:     if (!bidi) return moveLogically(line, start, dir, byUnit);
michael@0:     var pos = getBidiPartAt(bidi, start), part = bidi[pos];
michael@0:     var target = moveInLine(line, start, part.level % 2 ? -dir : dir, byUnit);
michael@0: 
michael@0:     for (;;) {
michael@0:       if (target > part.from && target < part.to) return target;
michael@0:       if (target == part.from || target == part.to) {
michael@0:         if (getBidiPartAt(bidi, target) == pos) return target;
michael@0:         part = bidi[pos += dir];
michael@0:         return (dir > 0) == part.level % 2 ? part.to : part.from;
michael@0:       } else {
michael@0:         part = bidi[pos += dir];
michael@0:         if (!part) return null;
michael@0:         if ((dir > 0) == part.level % 2)
michael@0:           target = moveInLine(line, part.to, -1, byUnit);
michael@0:         else
michael@0:           target = moveInLine(line, part.from, 1, byUnit);
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function moveLogically(line, start, dir, byUnit) {
michael@0:     var target = start + dir;
michael@0:     if (byUnit) while (target > 0 && isExtendingChar(line.text.charAt(target))) target += dir;
michael@0:     return target < 0 || target > line.text.length ? null : target;
michael@0:   }
michael@0: 
michael@0:   // Bidirectional ordering algorithm
michael@0:   // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
michael@0:   // that this (partially) implements.
michael@0: 
michael@0:   // One-char codes used for character types:
michael@0:   // L (L):   Left-to-Right
michael@0:   // R (R):   Right-to-Left
michael@0:   // r (AL):  Right-to-Left Arabic
michael@0:   // 1 (EN):  European Number
michael@0:   // + (ES):  European Number Separator
michael@0:   // % (ET):  European Number Terminator
michael@0:   // n (AN):  Arabic Number
michael@0:   // , (CS):  Common Number Separator
michael@0:   // m (NSM): Non-Spacing Mark
michael@0:   // b (BN):  Boundary Neutral
michael@0:   // s (B):   Paragraph Separator
michael@0:   // t (S):   Segment Separator
michael@0:   // w (WS):  Whitespace
michael@0:   // N (ON):  Other Neutrals
michael@0: 
michael@0:   // Returns null if characters are ordered as they appear
michael@0:   // (left-to-right), or an array of sections ({from, to, level}
michael@0:   // objects) in the order in which they occur visually.
michael@0:   var bidiOrdering = (function() {
michael@0:     // Character types for codepoints 0 to 0xff
michael@0:     var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN";
michael@0:     // Character types for codepoints 0x600 to 0x6ff
michael@0:     var arabicTypes = "rrrrrrrrrrrr,rNNmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmrrrrrrrnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmNmmmm";
michael@0:     function charType(code) {
michael@0:       if (code <= 0xf7) return lowTypes.charAt(code);
michael@0:       else if (0x590 <= code && code <= 0x5f4) return "R";
michael@0:       else if (0x600 <= code && code <= 0x6ed) return arabicTypes.charAt(code - 0x600);
michael@0:       else if (0x6ee <= code && code <= 0x8ac) return "r";
michael@0:       else if (0x2000 <= code && code <= 0x200b) return "w";
michael@0:       else if (code == 0x200c) return "b";
michael@0:       else return "L";
michael@0:     }
michael@0: 
michael@0:     var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
michael@0:     var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;
michael@0:     // Browsers seem to always treat the boundaries of block elements as being L.
michael@0:     var outerType = "L";
michael@0: 
michael@0:     function BidiSpan(level, from, to) {
michael@0:       this.level = level;
michael@0:       this.from = from; this.to = to;
michael@0:     }
michael@0: 
michael@0:     return function(str) {
michael@0:       if (!bidiRE.test(str)) return false;
michael@0:       var len = str.length, types = [];
michael@0:       for (var i = 0, type; i < len; ++i)
michael@0:         types.push(type = charType(str.charCodeAt(i)));
michael@0: 
michael@0:       // W1. Examine each non-spacing mark (NSM) in the level run, and
michael@0:       // change the type of the NSM to the type of the previous
michael@0:       // character. If the NSM is at the start of the level run, it will
michael@0:       // get the type of sor.
michael@0:       for (var i = 0, prev = outerType; i < len; ++i) {
michael@0:         var type = types[i];
michael@0:         if (type == "m") types[i] = prev;
michael@0:         else prev = type;
michael@0:       }
michael@0: 
michael@0:       // W2. Search backwards from each instance of a European number
michael@0:       // until the first strong type (R, L, AL, or sor) is found. If an
michael@0:       // AL is found, change the type of the European number to Arabic
michael@0:       // number.
michael@0:       // W3. Change all ALs to R.
michael@0:       for (var i = 0, cur = outerType; i < len; ++i) {
michael@0:         var type = types[i];
michael@0:         if (type == "1" && cur == "r") types[i] = "n";
michael@0:         else if (isStrong.test(type)) { cur = type; if (type == "r") types[i] = "R"; }
michael@0:       }
michael@0: 
michael@0:       // W4. A single European separator between two European numbers
michael@0:       // changes to a European number. A single common separator between
michael@0:       // two numbers of the same type changes to that type.
michael@0:       for (var i = 1, prev = types[0]; i < len - 1; ++i) {
michael@0:         var type = types[i];
michael@0:         if (type == "+" && prev == "1" && types[i+1] == "1") types[i] = "1";
michael@0:         else if (type == "," && prev == types[i+1] &&
michael@0:                  (prev == "1" || prev == "n")) types[i] = prev;
michael@0:         prev = type;
michael@0:       }
michael@0: 
michael@0:       // W5. A sequence of European terminators adjacent to European
michael@0:       // numbers changes to all European numbers.
michael@0:       // W6. Otherwise, separators and terminators change to Other
michael@0:       // Neutral.
michael@0:       for (var i = 0; i < len; ++i) {
michael@0:         var type = types[i];
michael@0:         if (type == ",") types[i] = "N";
michael@0:         else if (type == "%") {
michael@0:           for (var end = i + 1; end < len && types[end] == "%"; ++end) {}
michael@0:           var replace = (i && types[i-1] == "!") || (end < len && types[end] == "1") ? "1" : "N";
michael@0:           for (var j = i; j < end; ++j) types[j] = replace;
michael@0:           i = end - 1;
michael@0:         }
michael@0:       }
michael@0: 
michael@0:       // W7. Search backwards from each instance of a European number
michael@0:       // until the first strong type (R, L, or sor) is found. If an L is
michael@0:       // found, then change the type of the European number to L.
michael@0:       for (var i = 0, cur = outerType; i < len; ++i) {
michael@0:         var type = types[i];
michael@0:         if (cur == "L" && type == "1") types[i] = "L";
michael@0:         else if (isStrong.test(type)) cur = type;
michael@0:       }
michael@0: 
michael@0:       // N1. A sequence of neutrals takes the direction of the
michael@0:       // surrounding strong text if the text on both sides has the same
michael@0:       // direction. European and Arabic numbers act as if they were R in
michael@0:       // terms of their influence on neutrals. Start-of-level-run (sor)
michael@0:       // and end-of-level-run (eor) are used at level run boundaries.
michael@0:       // N2. Any remaining neutrals take the embedding direction.
michael@0:       for (var i = 0; i < len; ++i) {
michael@0:         if (isNeutral.test(types[i])) {
michael@0:           for (var end = i + 1; end < len && isNeutral.test(types[end]); ++end) {}
michael@0:           var before = (i ? types[i-1] : outerType) == "L";
michael@0:           var after = (end < len ? types[end] : outerType) == "L";
michael@0:           var replace = before || after ? "L" : "R";
michael@0:           for (var j = i; j < end; ++j) types[j] = replace;
michael@0:           i = end - 1;
michael@0:         }
michael@0:       }
michael@0: 
michael@0:       // Here we depart from the documented algorithm, in order to avoid
michael@0:       // building up an actual levels array. Since there are only three
michael@0:       // levels (0, 1, 2) in an implementation that doesn't take
michael@0:       // explicit embedding into account, we can build up the order on
michael@0:       // the fly, without following the level-based algorithm.
michael@0:       var order = [], m;
michael@0:       for (var i = 0; i < len;) {
michael@0:         if (countsAsLeft.test(types[i])) {
michael@0:           var start = i;
michael@0:           for (++i; i < len && countsAsLeft.test(types[i]); ++i) {}
michael@0:           order.push(new BidiSpan(0, start, i));
michael@0:         } else {
michael@0:           var pos = i, at = order.length;
michael@0:           for (++i; i < len && types[i] != "L"; ++i) {}
michael@0:           for (var j = pos; j < i;) {
michael@0:             if (countsAsNum.test(types[j])) {
michael@0:               if (pos < j) order.splice(at, 0, new BidiSpan(1, pos, j));
michael@0:               var nstart = j;
michael@0:               for (++j; j < i && countsAsNum.test(types[j]); ++j) {}
michael@0:               order.splice(at, 0, new BidiSpan(2, nstart, j));
michael@0:               pos = j;
michael@0:             } else ++j;
michael@0:           }
michael@0:           if (pos < i) order.splice(at, 0, new BidiSpan(1, pos, i));
michael@0:         }
michael@0:       }
michael@0:       if (order[0].level == 1 && (m = str.match(/^\s+/))) {
michael@0:         order[0].from = m[0].length;
michael@0:         order.unshift(new BidiSpan(0, 0, m[0].length));
michael@0:       }
michael@0:       if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
michael@0:         lst(order).to -= m[0].length;
michael@0:         order.push(new BidiSpan(0, len - m[0].length, len));
michael@0:       }
michael@0:       if (order[0].level != lst(order).level)
michael@0:         order.push(new BidiSpan(order[0].level, len, len));
michael@0: 
michael@0:       return order;
michael@0:     };
michael@0:   })();
michael@0: 
michael@0:   // THE END
michael@0: 
michael@0:   CodeMirror.version = "4.0.3";
michael@0: 
michael@0:   return CodeMirror;
michael@0: });