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matchbrackets.js
121 lines
| 1 | // CodeMirror, copyright (c) by Marijn Haverbeke and others |
| 2 | // Distributed under an MIT license: http://codemirror.net/LICENSE |
| 3 | |
| 4 | (function(mod) { |
| 5 | if (typeof exports == "object" && typeof module == "object") // CommonJS |
| 6 | mod(require("../../lib/codemirror")); |
| 7 | else if (typeof define == "function" && define.amd) // AMD |
| 8 | define(["../../lib/codemirror"], mod); |
| 9 | else // Plain browser env |
| 10 | mod(CodeMirror); |
| 11 | })(function(CodeMirror) { |
| 12 | var ie_lt8 = /MSIE \d/.test(navigator.userAgent) && |
| 13 | (document.documentMode == null || document.documentMode < 8); |
| 14 | |
| 15 | var Pos = CodeMirror.Pos; |
| 16 | |
| 17 | var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<"}; |
| 18 | |
| 19 | function findMatchingBracket(cm, where, strict, config) { |
| 20 | var line = cm.getLineHandle(where.line), pos = where.ch - 1; |
| 21 | var match = (pos >= 0 && matching[line.text.charAt(pos)]) || matching[line.text.charAt(++pos)]; |
| 22 | if (!match) return null; |
| 23 | var dir = match.charAt(1) == ">" ? 1 : -1; |
| 24 | if (strict && (dir > 0) != (pos == where.ch)) return null; |
| 25 | var style = cm.getTokenTypeAt(Pos(where.line, pos + 1)); |
| 26 | |
| 27 | var found = scanForBracket(cm, Pos(where.line, pos + (dir > 0 ? 1 : 0)), dir, style || null, config); |
| 28 | if (found == null) return null; |
| 29 | return {from: Pos(where.line, pos), to: found && found.pos, |
| 30 | match: found && found.ch == match.charAt(0), forward: dir > 0}; |
| 31 | } |
| 32 | |
| 33 | // bracketRegex is used to specify which type of bracket to scan |
| 34 | // should be a regexp, e.g. /[[\]]/ |
| 35 | // |
| 36 | // Note: If "where" is on an open bracket, then this bracket is ignored. |
| 37 | // |
| 38 | // Returns false when no bracket was found, null when it reached |
| 39 | // maxScanLines and gave up |
| 40 | function scanForBracket(cm, where, dir, style, config) { |
| 41 | var maxScanLen = (config && config.maxScanLineLength) || 10000; |
| 42 | var maxScanLines = (config && config.maxScanLines) || 1000; |
| 43 | |
| 44 | var stack = []; |
| 45 | var re = config && config.bracketRegex ? config.bracketRegex : /[(){}[\]]/; |
| 46 | var lineEnd = dir > 0 ? Math.min(where.line + maxScanLines, cm.lastLine() + 1) |
| 47 | : Math.max(cm.firstLine() - 1, where.line - maxScanLines); |
| 48 | for (var lineNo = where.line; lineNo != lineEnd; lineNo += dir) { |
| 49 | var line = cm.getLine(lineNo); |
| 50 | if (!line) continue; |
| 51 | var pos = dir > 0 ? 0 : line.length - 1, end = dir > 0 ? line.length : -1; |
| 52 | if (line.length > maxScanLen) continue; |
| 53 | if (lineNo == where.line) pos = where.ch - (dir < 0 ? 1 : 0); |
| 54 | for (; pos != end; pos += dir) { |
| 55 | var ch = line.charAt(pos); |
| 56 | if (re.test(ch) && (style === undefined || cm.getTokenTypeAt(Pos(lineNo, pos + 1)) == style)) { |
| 57 | var match = matching[ch]; |
| 58 | if ((match.charAt(1) == ">") == (dir > 0)) stack.push(ch); |
| 59 | else if (!stack.length) return {pos: Pos(lineNo, pos), ch: ch}; |
| 60 | else stack.pop(); |
| 61 | } |
| 62 | } |
| 63 | } |
| 64 | return lineNo - dir == (dir > 0 ? cm.lastLine() : cm.firstLine()) ? false : null; |
| 65 | } |
| 66 | |
| 67 | function matchBrackets(cm, autoclear, config) { |
| 68 | // Disable brace matching in long lines, since it'll cause hugely slow updates |
| 69 | var maxHighlightLen = cm.state.matchBrackets.maxHighlightLineLength || 1000; |
| 70 | var marks = [], ranges = cm.listSelections(); |
| 71 | for (var i = 0; i < ranges.length; i++) { |
| 72 | var match = ranges[i].empty() && findMatchingBracket(cm, ranges[i].head, false, config); |
| 73 | if (match && cm.getLine(match.from.line).length <= maxHighlightLen) { |
| 74 | var style = match.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket"; |
| 75 | marks.push(cm.markText(match.from, Pos(match.from.line, match.from.ch + 1), {className: style})); |
| 76 | if (match.to && cm.getLine(match.to.line).length <= maxHighlightLen) |
| 77 | marks.push(cm.markText(match.to, Pos(match.to.line, match.to.ch + 1), {className: style})); |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | if (marks.length) { |
| 82 | // Kludge to work around the IE bug from issue #1193, where text |
| 83 | // input stops going to the textare whever this fires. |
| 84 | if (ie_lt8 && cm.state.focused) cm.focus(); |
| 85 | |
| 86 | var clear = function() { |
| 87 | cm.operation(function() { |
| 88 | for (var i = 0; i < marks.length; i++) marks[i].clear(); |
| 89 | }); |
| 90 | }; |
| 91 | if (autoclear) setTimeout(clear, 800); |
| 92 | else return clear; |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | var currentlyHighlighted = null; |
| 97 | function doMatchBrackets(cm) { |
| 98 | cm.operation(function() { |
| 99 | if (currentlyHighlighted) {currentlyHighlighted(); currentlyHighlighted = null;} |
| 100 | currentlyHighlighted = matchBrackets(cm, false, cm.state.matchBrackets); |
| 101 | }); |
| 102 | } |
| 103 | |
| 104 | CodeMirror.defineOption("matchBrackets", false, function(cm, val, old) { |
| 105 | if (old && old != CodeMirror.Init) |
| 106 | cm.off("cursorActivity", doMatchBrackets); |
| 107 | if (val) { |
| 108 | cm.state.matchBrackets = typeof val == "object" ? val : {}; |
| 109 | cm.on("cursorActivity", doMatchBrackets); |
| 110 | } |
| 111 | }); |
| 112 | |
| 113 | CodeMirror.defineExtension("matchBrackets", function() {matchBrackets(this, true);}); |
| 114 | CodeMirror.defineExtension("findMatchingBracket", function(pos, strict, config){ |
| 115 | return findMatchingBracket(this, pos, strict, config); |
| 116 | }); |
| 117 | CodeMirror.defineExtension("scanForBracket", function(pos, dir, style, config){ |
| 118 | return scanForBracket(this, pos, dir, style, config); |
| 119 | }); |
| 120 | }); |
| 121 |