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.display.input.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