64 lines
2.8 KiB
JavaScript
64 lines
2.8 KiB
JavaScript
(function() {
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var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<"};
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function findMatchingBracket(cm) {
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var cur = 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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var style = cm.getTokenAt({line: cur.line, ch: pos + 1}).type;
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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 (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.getTokenAt({line: lineNo, ch: pos + 1}).type == 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: {line: cur.line, ch: pos}, to: found && {line: i, ch: found.pos}, match: found && found.match};
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}
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function matchBrackets(cm, autoclear) {
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var found = findMatchingBracket(cm);
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if (!found) return;
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var style = found.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
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var one = cm.markText(found.from, {line: found.from.line, ch: found.from.ch + 1},
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{className: style});
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var two = found.to && cm.markText(found.to, {line: found.to.line, ch: found.to.ch + 1},
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{className: style});
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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) {
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if (val) cm.on("cursorActivity", doMatchBrackets);
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else cm.off("cursorActivity", doMatchBrackets);
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});
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CodeMirror.defineExtension("matchBrackets", function() {matchBrackets(this, true);});
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CodeMirror.defineExtension("findMatchingBracket", function(){return findMatchingBracket(this);});
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})();
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