87 lines
3.7 KiB
JavaScript
87 lines
3.7 KiB
JavaScript
(function() {
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var ie_lt8 = /MSIE \d/.test(navigator.userAgent) &&
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(document.documentMode == null || document.documentMode < 8);
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var Pos = CodeMirror.Pos;
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var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<"};
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function findMatchingBracket(cm, where, strict) {
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var state = cm.state.matchBrackets;
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var maxScanLen = (state && state.maxScanLineLength) || 10000;
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var cur = where || cm.getCursor(), line = cm.getLineHandle(cur.line), pos = cur.ch - 1;
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var match = (pos >= 0 && matching[line.text.charAt(pos)]) || matching[line.text.charAt(++pos)];
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if (!match) return null;
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var forward = match.charAt(1) == ">", d = forward ? 1 : -1;
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if (strict && forward != (pos == cur.ch)) return null;
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var style = cm.getTokenTypeAt(Pos(cur.line, pos + 1));
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var stack = [line.text.charAt(pos)], re = /[(){}[\]]/;
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function scan(line, lineNo, start) {
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if (!line.text) return;
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var pos = forward ? 0 : line.text.length - 1, end = forward ? line.text.length : -1;
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if (line.text.length > maxScanLen) return null;
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if (start != null) pos = start + d;
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for (; pos != end; pos += d) {
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var ch = line.text.charAt(pos);
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if (re.test(ch) && cm.getTokenTypeAt(Pos(lineNo, pos + 1)) == style) {
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var match = matching[ch];
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if (match.charAt(1) == ">" == forward) stack.push(ch);
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else if (stack.pop() != match.charAt(0)) return {pos: pos, match: false};
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else if (!stack.length) return {pos: pos, match: true};
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}
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}
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}
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for (var i = cur.line, found, e = forward ? Math.min(i + 100, cm.lineCount()) : Math.max(-1, i - 100); i != e; i+=d) {
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if (i == cur.line) found = scan(line, i, pos);
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else found = scan(cm.getLineHandle(i), i);
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if (found) break;
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}
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return {from: Pos(cur.line, pos), to: found && Pos(i, found.pos),
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match: found && found.match, forward: forward};
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}
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function matchBrackets(cm, autoclear) {
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// Disable brace matching in long lines, since it'll cause hugely slow updates
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var maxHighlightLen = cm.state.matchBrackets.maxHighlightLineLength || 1000;
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var found = findMatchingBracket(cm);
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if (!found || cm.getLine(found.from.line).length > maxHighlightLen ||
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found.to && cm.getLine(found.to.line).length > maxHighlightLen)
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return;
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var style = found.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
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var one = cm.markText(found.from, Pos(found.from.line, found.from.ch + 1), {className: style});
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var two = found.to && cm.markText(found.to, Pos(found.to.line, found.to.ch + 1), {className: style});
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// Kludge to work around the IE bug from issue #1193, where text
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// input stops going to the textare whever this fires.
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if (ie_lt8 && cm.state.focused) cm.display.input.focus();
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var clear = function() {
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cm.operation(function() { one.clear(); two && two.clear(); });
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};
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if (autoclear) setTimeout(clear, 800);
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else return clear;
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}
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var currentlyHighlighted = null;
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function doMatchBrackets(cm) {
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cm.operation(function() {
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if (currentlyHighlighted) {currentlyHighlighted(); currentlyHighlighted = null;}
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if (!cm.somethingSelected()) currentlyHighlighted = matchBrackets(cm, false);
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});
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}
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CodeMirror.defineOption("matchBrackets", false, function(cm, val, old) {
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if (old && old != CodeMirror.Init)
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cm.off("cursorActivity", doMatchBrackets);
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if (val) {
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cm.state.matchBrackets = typeof val == "object" ? val : {};
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cm.on("cursorActivity", doMatchBrackets);
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}
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});
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CodeMirror.defineExtension("matchBrackets", function() {matchBrackets(this, true);});
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CodeMirror.defineExtension("findMatchingBracket", function(pos, strict){
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return findMatchingBracket(this, pos, strict);
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});
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})();
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