michael@0: (function() {
michael@0:   "use strict";
michael@0: 
michael@0:   var Pos = CodeMirror.Pos;
michael@0:   function cmp(a, b) { return a.line - b.line || a.ch - b.ch; }
michael@0: 
michael@0:   var nameStartChar = "A-Z_a-z\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u02FF\\u0370-\\u037D\\u037F-\\u1FFF\\u200C-\\u200D\\u2070-\\u218F\\u2C00-\\u2FEF\\u3001-\\uD7FF\\uF900-\\uFDCF\\uFDF0-\\uFFFD";
michael@0:   var nameChar = nameStartChar + "\-\:\.0-9\\u00B7\\u0300-\\u036F\\u203F-\\u2040";
michael@0:   var xmlTagStart = new RegExp("<(/?)([" + nameStartChar + "][" + nameChar + "]*)", "g");
michael@0: 
michael@0:   function Iter(cm, line, ch, range) {
michael@0:     this.line = line; this.ch = ch;
michael@0:     this.cm = cm; this.text = cm.getLine(line);
michael@0:     this.min = range ? range.from : cm.firstLine();
michael@0:     this.max = range ? range.to - 1 : cm.lastLine();
michael@0:   }
michael@0: 
michael@0:   function tagAt(iter, ch) {
michael@0:     var type = iter.cm.getTokenTypeAt(Pos(iter.line, ch));
michael@0:     return type && /\btag\b/.test(type);
michael@0:   }
michael@0: 
michael@0:   function nextLine(iter) {
michael@0:     if (iter.line >= iter.max) return;
michael@0:     iter.ch = 0;
michael@0:     iter.text = iter.cm.getLine(++iter.line);
michael@0:     return true;
michael@0:   }
michael@0:   function prevLine(iter) {
michael@0:     if (iter.line <= iter.min) return;
michael@0:     iter.text = iter.cm.getLine(--iter.line);
michael@0:     iter.ch = iter.text.length;
michael@0:     return true;
michael@0:   }
michael@0: 
michael@0:   function toTagEnd(iter) {
michael@0:     for (;;) {
michael@0:       var gt = iter.text.indexOf(">", iter.ch);
michael@0:       if (gt == -1) { if (nextLine(iter)) continue; else return; }
michael@0:       if (!tagAt(iter, gt + 1)) { iter.ch = gt + 1; continue; }
michael@0:       var lastSlash = iter.text.lastIndexOf("/", gt);
michael@0:       var selfClose = lastSlash > -1 && !/\S/.test(iter.text.slice(lastSlash + 1, gt));
michael@0:       iter.ch = gt + 1;
michael@0:       return selfClose ? "selfClose" : "regular";
michael@0:     }
michael@0:   }
michael@0:   function toTagStart(iter) {
michael@0:     for (;;) {
michael@0:       var lt = iter.ch ? iter.text.lastIndexOf("<", iter.ch - 1) : -1;
michael@0:       if (lt == -1) { if (prevLine(iter)) continue; else return; }
michael@0:       if (!tagAt(iter, lt + 1)) { iter.ch = lt; continue; }
michael@0:       xmlTagStart.lastIndex = lt;
michael@0:       iter.ch = lt;
michael@0:       var match = xmlTagStart.exec(iter.text);
michael@0:       if (match && match.index == lt) return match;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function toNextTag(iter) {
michael@0:     for (;;) {
michael@0:       xmlTagStart.lastIndex = iter.ch;
michael@0:       var found = xmlTagStart.exec(iter.text);
michael@0:       if (!found) { if (nextLine(iter)) continue; else return; }
michael@0:       if (!tagAt(iter, found.index + 1)) { iter.ch = found.index + 1; continue; }
michael@0:       iter.ch = found.index + found[0].length;
michael@0:       return found;
michael@0:     }
michael@0:   }
michael@0:   function toPrevTag(iter) {
michael@0:     for (;;) {
michael@0:       var gt = iter.ch ? iter.text.lastIndexOf(">", iter.ch - 1) : -1;
michael@0:       if (gt == -1) { if (prevLine(iter)) continue; else return; }
michael@0:       if (!tagAt(iter, gt + 1)) { iter.ch = gt; continue; }
michael@0:       var lastSlash = iter.text.lastIndexOf("/", gt);
michael@0:       var selfClose = lastSlash > -1 && !/\S/.test(iter.text.slice(lastSlash + 1, gt));
michael@0:       iter.ch = gt + 1;
michael@0:       return selfClose ? "selfClose" : "regular";
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function findMatchingClose(iter, tag) {
michael@0:     var stack = [];
michael@0:     for (;;) {
michael@0:       var next = toNextTag(iter), end, startLine = iter.line, startCh = iter.ch - (next ? next[0].length : 0);
michael@0:       if (!next || !(end = toTagEnd(iter))) return;
michael@0:       if (end == "selfClose") continue;
michael@0:       if (next[1]) { // closing tag
michael@0:         for (var i = stack.length - 1; i >= 0; --i) if (stack[i] == next[2]) {
michael@0:           stack.length = i;
michael@0:           break;
michael@0:         }
michael@0:         if (i < 0 && (!tag || tag == next[2])) return {
michael@0:           tag: next[2],
michael@0:           from: Pos(startLine, startCh),
michael@0:           to: Pos(iter.line, iter.ch)
michael@0:         };
michael@0:       } else { // opening tag
michael@0:         stack.push(next[2]);
michael@0:       }
michael@0:     }
michael@0:   }
michael@0:   function findMatchingOpen(iter, tag) {
michael@0:     var stack = [];
michael@0:     for (;;) {
michael@0:       var prev = toPrevTag(iter);
michael@0:       if (!prev) return;
michael@0:       if (prev == "selfClose") { toTagStart(iter); continue; }
michael@0:       var endLine = iter.line, endCh = iter.ch;
michael@0:       var start = toTagStart(iter);
michael@0:       if (!start) return;
michael@0:       if (start[1]) { // closing tag
michael@0:         stack.push(start[2]);
michael@0:       } else { // opening tag
michael@0:         for (var i = stack.length - 1; i >= 0; --i) if (stack[i] == start[2]) {
michael@0:           stack.length = i;
michael@0:           break;
michael@0:         }
michael@0:         if (i < 0 && (!tag || tag == start[2])) return {
michael@0:           tag: start[2],
michael@0:           from: Pos(iter.line, iter.ch),
michael@0:           to: Pos(endLine, endCh)
michael@0:         };
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   CodeMirror.registerHelper("fold", "xml", function(cm, start) {
michael@0:     var iter = new Iter(cm, start.line, 0);
michael@0:     for (;;) {
michael@0:       var openTag = toNextTag(iter), end;
michael@0:       if (!openTag || iter.line != start.line || !(end = toTagEnd(iter))) return;
michael@0:       if (!openTag[1] && end != "selfClose") {
michael@0:         var start = Pos(iter.line, iter.ch);
michael@0:         var close = findMatchingClose(iter, openTag[2]);
michael@0:         return close && {from: start, to: close.from};
michael@0:       }
michael@0:     }
michael@0:   });
michael@0:   CodeMirror.tagRangeFinder = CodeMirror.fold.xml; // deprecated
michael@0: 
michael@0:   CodeMirror.findMatchingTag = function(cm, pos, range) {
michael@0:     var iter = new Iter(cm, pos.line, pos.ch, range);
michael@0:     if (iter.text.indexOf(">") == -1 && iter.text.indexOf("<") == -1) return;
michael@0:     var end = toTagEnd(iter), to = end && Pos(iter.line, iter.ch);
michael@0:     var start = end && toTagStart(iter);
michael@0:     if (!end || end == "selfClose" || !start || cmp(iter, pos) > 0) return;
michael@0:     var here = {from: Pos(iter.line, iter.ch), to: to, tag: start[2]};
michael@0: 
michael@0:     if (start[1]) { // closing tag
michael@0:       return {open: findMatchingOpen(iter, start[2]), close: here, at: "close"};
michael@0:     } else { // opening tag
michael@0:       iter = new Iter(cm, to.line, to.ch, range);
michael@0:       return {open: here, close: findMatchingClose(iter, start[2]), at: "open"};
michael@0:     }
michael@0:   };
michael@0: 
michael@0:   CodeMirror.findEnclosingTag = function(cm, pos, range) {
michael@0:     var iter = new Iter(cm, pos.line, pos.ch, range);
michael@0:     for (;;) {
michael@0:       var open = findMatchingOpen(iter);
michael@0:       if (!open) break;
michael@0:       var forward = new Iter(cm, pos.line, pos.ch, range);
michael@0:       var close = findMatchingClose(forward, open.tag);
michael@0:       if (close) return {open: open, close: close};
michael@0:     }
michael@0:   };
michael@0: 
michael@0:   // Used by addon/edit/closetag.js
michael@0:   CodeMirror.scanForClosingTag = function(cm, pos, name, end) {
michael@0:     var iter = new Iter(cm, pos.line, pos.ch, end ? {from: 0, to: end} : null);
michael@0:     return !!findMatchingClose(iter, name);
michael@0:   };
michael@0: })();