120 lines
5.1 KiB
JavaScript
120 lines
5.1 KiB
JavaScript
// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: http://codemirror.net/LICENSE
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(function(mod) {
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if (typeof exports == "object" && typeof module == "object") // CommonJS
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mod(require("../../lib/codemirror"));
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else if (typeof define == "function" && define.amd) // AMD
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define(["../../lib/codemirror"], mod);
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else // Plain browser env
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mod(CodeMirror);
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})(function(CodeMirror) {
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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, config) {
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var line = cm.getLineHandle(where.line), pos = where.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 dir = match.charAt(1) == ">" ? 1 : -1;
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if (strict && (dir > 0) != (pos == where.ch)) return null;
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var style = cm.getTokenTypeAt(Pos(where.line, pos + 1));
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var found = scanForBracket(cm, Pos(where.line, pos + (dir > 0 ? 1 : 0)), dir, style || null, config);
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if (found == null) return null;
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return {from: Pos(where.line, pos), to: found && found.pos,
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match: found && found.ch == match.charAt(0), forward: dir > 0};
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}
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// bracketRegex is used to specify which type of bracket to scan
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// should be a regexp, e.g. /[[\]]/
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//
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// Note: If "where" is on an open bracket, then this bracket is ignored.
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//
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// Returns false when no bracket was found, null when it reached
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// maxScanLines and gave up
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function scanForBracket(cm, where, dir, style, config) {
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var maxScanLen = (config && config.maxScanLineLength) || 10000;
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var maxScanLines = (config && config.maxScanLines) || 1000;
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var stack = [];
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var re = config && config.bracketRegex ? config.bracketRegex : /[(){}[\]]/;
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var lineEnd = dir > 0 ? Math.min(where.line + maxScanLines, cm.lastLine() + 1)
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: Math.max(cm.firstLine() - 1, where.line - maxScanLines);
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for (var lineNo = where.line; lineNo != lineEnd; lineNo += dir) {
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var line = cm.getLine(lineNo);
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if (!line) continue;
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var pos = dir > 0 ? 0 : line.length - 1, end = dir > 0 ? line.length : -1;
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if (line.length > maxScanLen) continue;
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if (lineNo == where.line) pos = where.ch - (dir < 0 ? 1 : 0);
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for (; pos != end; pos += dir) {
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var ch = line.charAt(pos);
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if (re.test(ch) && (style === undefined || cm.getTokenTypeAt(Pos(lineNo, pos + 1)) == style)) {
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var match = matching[ch];
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if ((match.charAt(1) == ">") == (dir > 0)) stack.push(ch);
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else if (!stack.length) return {pos: Pos(lineNo, pos), ch: ch};
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else stack.pop();
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}
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}
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}
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return lineNo - dir == (dir > 0 ? cm.lastLine() : cm.firstLine()) ? false : null;
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}
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function matchBrackets(cm, autoclear, config) {
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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 marks = [], ranges = cm.listSelections();
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for (var i = 0; i < ranges.length; i++) {
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var match = ranges[i].empty() && findMatchingBracket(cm, ranges[i].head, false, config);
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if (match && cm.getLine(match.from.line).length <= maxHighlightLen) {
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var style = match.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
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marks.push(cm.markText(match.from, Pos(match.from.line, match.from.ch + 1), {className: style}));
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if (match.to && cm.getLine(match.to.line).length <= maxHighlightLen)
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marks.push(cm.markText(match.to, Pos(match.to.line, match.to.ch + 1), {className: style}));
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}
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}
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if (marks.length) {
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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.focus();
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var clear = function() {
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cm.operation(function() {
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for (var i = 0; i < marks.length; i++) marks[i].clear();
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});
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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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}
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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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currentlyHighlighted = matchBrackets(cm, false, cm.state.matchBrackets);
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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, config){
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return findMatchingBracket(this, pos, strict, config);
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});
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CodeMirror.defineExtension("scanForBracket", function(pos, dir, style, config){
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return scanForBracket(this, pos, dir, style, config);
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});
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});
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