michael@0: (function(mod) {
michael@0:   if (typeof exports == "object" && typeof module == "object") // CommonJS
michael@0:     mod(require("../../lib/codemirror"));
michael@0:   else if (typeof define == "function" && define.amd) // AMD
michael@0:     define(["../../lib/codemirror"], mod);
michael@0:   else // Plain browser env
michael@0:     mod(CodeMirror);
michael@0: })(function(CodeMirror) {
michael@0:   var ie_lt8 = /MSIE \d/.test(navigator.userAgent) &&
michael@0:     (document.documentMode == null || document.documentMode < 8);
michael@0: 
michael@0:   var Pos = CodeMirror.Pos;
michael@0: 
michael@0:   var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<"};
michael@0: 
michael@0:   function findMatchingBracket(cm, where, strict, config) {
michael@0:     var line = cm.getLineHandle(where.line), pos = where.ch - 1;
michael@0:     var match = (pos >= 0 && matching[line.text.charAt(pos)]) || matching[line.text.charAt(++pos)];
michael@0:     if (!match) return null;
michael@0:     var dir = match.charAt(1) == ">" ? 1 : -1;
michael@0:     if (strict && (dir > 0) != (pos == where.ch)) return null;
michael@0:     var style = cm.getTokenTypeAt(Pos(where.line, pos + 1));
michael@0: 
michael@0:     var found = scanForBracket(cm, Pos(where.line, pos + (dir > 0 ? 1 : 0)), dir, style || null, config);
michael@0:     return {from: Pos(where.line, pos), to: found && found.pos,
michael@0:             match: found && found.ch == match.charAt(0), forward: dir > 0};
michael@0:   }
michael@0: 
michael@0:   function scanForBracket(cm, where, dir, style, config) {
michael@0:     var maxScanLen = (config && config.maxScanLineLength) || 10000;
michael@0:     var maxScanLines = (config && config.maxScanLines) || 500;
michael@0: 
michael@0:     var stack = [], re = /[(){}[\]]/;
michael@0:     var lineEnd = dir > 0 ? Math.min(where.line + maxScanLines, cm.lastLine() + 1)
michael@0:                           : Math.max(cm.firstLine() - 1, where.line - maxScanLines);
michael@0:     for (var lineNo = where.line; lineNo != lineEnd; lineNo += dir) {
michael@0:       var line = cm.getLine(lineNo);
michael@0:       if (!line) continue;
michael@0:       var pos = dir > 0 ? 0 : line.length - 1, end = dir > 0 ? line.length : -1;
michael@0:       if (line.length > maxScanLen) continue;
michael@0:       if (lineNo == where.line) pos = where.ch - (dir < 0 ? 1 : 0);
michael@0:       for (; pos != end; pos += dir) {
michael@0:         var ch = line.charAt(pos);
michael@0:         if (re.test(ch) && (style === undefined || cm.getTokenTypeAt(Pos(lineNo, pos + 1)) == style)) {
michael@0:           var match = matching[ch];
michael@0:           if ((match.charAt(1) == ">") == (dir > 0)) stack.push(ch);
michael@0:           else if (!stack.length) return {pos: Pos(lineNo, pos), ch: ch};
michael@0:           else stack.pop();
michael@0:         }
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   function matchBrackets(cm, autoclear, config) {
michael@0:     // Disable brace matching in long lines, since it'll cause hugely slow updates
michael@0:     var maxHighlightLen = cm.state.matchBrackets.maxHighlightLineLength || 1000;
michael@0:     var marks = [], ranges = cm.listSelections();
michael@0:     for (var i = 0; i < ranges.length; i++) {
michael@0:       var match = ranges[i].empty() && findMatchingBracket(cm, ranges[i].head, false, config);
michael@0:       if (match && cm.getLine(match.from.line).length <= maxHighlightLen &&
michael@0:           match.to && cm.getLine(match.to.line).length <= maxHighlightLen) {
michael@0:         var style = match.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
michael@0:         marks.push(cm.markText(match.from, Pos(match.from.line, match.from.ch + 1), {className: style}));
michael@0:         if (match.to)
michael@0:           marks.push(cm.markText(match.to, Pos(match.to.line, match.to.ch + 1), {className: style}));
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     if (marks.length) {
michael@0:       // Kludge to work around the IE bug from issue #1193, where text
michael@0:       // input stops going to the textare whever this fires.
michael@0:       if (ie_lt8 && cm.state.focused) cm.display.input.focus();
michael@0: 
michael@0:       var clear = function() {
michael@0:         cm.operation(function() {
michael@0:           for (var i = 0; i < marks.length; i++) marks[i].clear();
michael@0:         });
michael@0:       };
michael@0:       if (autoclear) setTimeout(clear, 800);
michael@0:       else return clear;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   var currentlyHighlighted = null;
michael@0:   function doMatchBrackets(cm) {
michael@0:     cm.operation(function() {
michael@0:       if (currentlyHighlighted) {currentlyHighlighted(); currentlyHighlighted = null;}
michael@0:       currentlyHighlighted = matchBrackets(cm, false, cm.state.matchBrackets);
michael@0:     });
michael@0:   }
michael@0: 
michael@0:   CodeMirror.defineOption("matchBrackets", false, function(cm, val, old) {
michael@0:     if (old && old != CodeMirror.Init)
michael@0:       cm.off("cursorActivity", doMatchBrackets);
michael@0:     if (val) {
michael@0:       cm.state.matchBrackets = typeof val == "object" ? val : {};
michael@0:       cm.on("cursorActivity", doMatchBrackets);
michael@0:     }
michael@0:   });
michael@0: 
michael@0:   CodeMirror.defineExtension("matchBrackets", function() {matchBrackets(this, true);});
michael@0:   CodeMirror.defineExtension("findMatchingBracket", function(pos, strict){
michael@0:     return findMatchingBracket(this, pos, strict);
michael@0:   });
michael@0:   CodeMirror.defineExtension("scanForBracket", function(pos, dir, style){
michael@0:     return scanForBracket(this, pos, dir, style);
michael@0:   });
michael@0: });