2 var ie_lt8 = /MSIE \d/.test(navigator.userAgent) &&
3 (document.documentMode == null || document.documentMode < 8);
5 var Pos = CodeMirror.Pos;
7 var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<"};
8 function findMatchingBracket(cm, where, strict) {
9 var state = cm.state.matchBrackets;
10 var maxScanLen = (state && state.maxScanLineLength) || 10000;
12 var cur = where || cm.getCursor(), line = cm.getLineHandle(cur.line), pos = cur.ch - 1;
13 var match = (pos >= 0 && matching[line.text.charAt(pos)]) || matching[line.text.charAt(++pos)];
14 if (!match) return null;
15 var forward = match.charAt(1) == ">", d = forward ? 1 : -1;
16 if (strict && forward != (pos == cur.ch)) return null;
17 var style = cm.getTokenTypeAt(Pos(cur.line, pos + 1));
19 var stack = [line.text.charAt(pos)], re = /[(){}[\]]/;
20 function scan(line, lineNo, start) {
21 if (!line.text) return;
22 var pos = forward ? 0 : line.text.length - 1, end = forward ? line.text.length : -1;
23 if (line.text.length > maxScanLen) return null;
24 if (start != null) pos = start + d;
25 for (; pos != end; pos += d) {
26 var ch = line.text.charAt(pos);
27 if (re.test(ch) && cm.getTokenTypeAt(Pos(lineNo, pos + 1)) == style) {
28 var match = matching[ch];
29 if (match.charAt(1) == ">" == forward) stack.push(ch);
30 else if (stack.pop() != match.charAt(0)) return {pos: pos, match: false};
31 else if (!stack.length) return {pos: pos, match: true};
35 for (var i = cur.line, found, e = forward ? Math.min(i + 100, cm.lineCount()) : Math.max(-1, i - 100); i != e; i+=d) {
36 if (i == cur.line) found = scan(line, i, pos);
37 else found = scan(cm.getLineHandle(i), i);
40 return {from: Pos(cur.line, pos), to: found && Pos(i, found.pos),
41 match: found && found.match, forward: forward};
44 function matchBrackets(cm, autoclear) {
45 // Disable brace matching in long lines, since it'll cause hugely slow updates
46 var maxHighlightLen = cm.state.matchBrackets.maxHighlightLineLength || 1000;
47 var found = findMatchingBracket(cm);
48 if (!found || cm.getLine(found.from.line).length > maxHighlightLen ||
49 found.to && cm.getLine(found.to.line).length > maxHighlightLen)
52 var style = found.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
53 var one = cm.markText(found.from, Pos(found.from.line, found.from.ch + 1), {className: style});
54 var two = found.to && cm.markText(found.to, Pos(found.to.line, found.to.ch + 1), {className: style});
55 // Kludge to work around the IE bug from issue #1193, where text
56 // input stops going to the textare whever this fires.
57 if (ie_lt8 && cm.state.focused) cm.display.input.focus();
58 var clear = function() {
59 cm.operation(function() { one.clear(); two && two.clear(); });
61 if (autoclear) setTimeout(clear, 800);
65 var currentlyHighlighted = null;
66 function doMatchBrackets(cm) {
67 cm.operation(function() {
68 if (currentlyHighlighted) {currentlyHighlighted(); currentlyHighlighted = null;}
69 if (!cm.somethingSelected()) currentlyHighlighted = matchBrackets(cm, false);
73 CodeMirror.defineOption("matchBrackets", false, function(cm, val, old) {
74 if (old && old != CodeMirror.Init)
75 cm.off("cursorActivity", doMatchBrackets);
77 cm.state.matchBrackets = typeof val == "object" ? val : {};
78 cm.on("cursorActivity", doMatchBrackets);
82 CodeMirror.defineExtension("matchBrackets", function() {matchBrackets(this, true);});
83 CodeMirror.defineExtension("findMatchingBracket", function(pos, strict){
84 return findMatchingBracket(this, pos, strict);