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  1. // CodeMirror, copyright (c) by Marijn Haverbeke and others
  2. // Distributed under an MIT license: https://codemirror.net/5/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 bracketRegex(config) {
  20.     return config && config.bracketRegex || /[(){}[\]]/
  21.   }
  22.  
  23.   function findMatchingBracket(cm, where, config) {
  24.     var line = cm.getLineHandle(where.line), pos = where.ch - 1;
  25.     var afterCursor = config && config.afterCursor
  26.     if (afterCursor == null)
  27.       afterCursor = /(^| )cm-fat-cursor($| )/.test(cm.getWrapperElement().className)
  28.     var re = bracketRegex(config)
  29.  
  30.     // A cursor is defined as between two characters, but in in vim command mode
  31.     // (i.e. not insert mode), the cursor is visually represented as a
  32.     // highlighted box on top of the 2nd character. Otherwise, we allow matches
  33.     // from before or after the cursor.
  34.     var match = (!afterCursor && pos >= 0 && re.test(line.text.charAt(pos)) && matching[line.text.charAt(pos)]) ||
  35.         re.test(line.text.charAt(pos + 1)) && matching[line.text.charAt(++pos)];
  36.     if (!match) return null;
  37.     var dir = match.charAt(1) == ">" ? 1 : -1;
  38.     if (config && config.strict && (dir > 0) != (pos == where.ch)) return null;
  39.     var style = cm.getTokenTypeAt(Pos(where.line, pos + 1));
  40.  
  41.     var found = scanForBracket(cm, Pos(where.line, pos + (dir > 0 ? 1 : 0)), dir, style, config);
  42.     if (found == null) return null;
  43.     return {from: Pos(where.line, pos), to: found && found.pos,
  44.             match: found && found.ch == match.charAt(0), forward: dir > 0};
  45.   }
  46.  
  47.   // bracketRegex is used to specify which type of bracket to scan
  48.   // should be a regexp, e.g. /[[\]]/
  49.   //
  50.   // Note: If "where" is on an open bracket, then this bracket is ignored.
  51.   //
  52.   // Returns false when no bracket was found, null when it reached
  53.   // maxScanLines and gave up
  54.   function scanForBracket(cm, where, dir, style, config) {
  55.     var maxScanLen = (config && config.maxScanLineLength) || 10000;
  56.     var maxScanLines = (config && config.maxScanLines) || 1000;
  57.  
  58.     var stack = [];
  59.     var re = bracketRegex(config)
  60.     var lineEnd = dir > 0 ? Math.min(where.line + maxScanLines, cm.lastLine() + 1)
  61.                           : Math.max(cm.firstLine() - 1, where.line - maxScanLines);
  62.     for (var lineNo = where.line; lineNo != lineEnd; lineNo += dir) {
  63.       var line = cm.getLine(lineNo);
  64.       if (!line) continue;
  65.       var pos = dir > 0 ? 0 : line.length - 1, end = dir > 0 ? line.length : -1;
  66.       if (line.length > maxScanLen) continue;
  67.       if (lineNo == where.line) pos = where.ch - (dir < 0 ? 1 : 0);
  68.       for (; pos != end; pos += dir) {
  69.         var ch = line.charAt(pos);
  70.         if (re.test(ch) && (style === undefined ||
  71.                             (cm.getTokenTypeAt(Pos(lineNo, pos + 1)) || "") == (style || ""))) {
  72.           var match = matching[ch];
  73.           if (match && (match.charAt(1) == ">") == (dir > 0)) stack.push(ch);
  74.           else if (!stack.length) return {pos: Pos(lineNo, pos), ch: ch};
  75.           else stack.pop();
  76.         }
  77.       }
  78.     }
  79.     return lineNo - dir == (dir > 0 ? cm.lastLine() : cm.firstLine()) ? false : null;
  80.   }
  81.  
  82.   function matchBrackets(cm, autoclear, config) {
  83.     // Disable brace matching in long lines, since it'll cause hugely slow updates
  84.     var maxHighlightLen = cm.state.matchBrackets.maxHighlightLineLength || 1000,
  85.       highlightNonMatching = config && config.highlightNonMatching;
  86.     var marks = [], ranges = cm.listSelections();
  87.     for (var i = 0; i < ranges.length; i++) {
  88.       var match = ranges[i].empty() && findMatchingBracket(cm, ranges[i].head, config);
  89.       if (match && (match.match || highlightNonMatching !== false) && cm.getLine(match.from.line).length <= maxHighlightLen) {
  90.         var style = match.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
  91.         marks.push(cm.markText(match.from, Pos(match.from.line, match.from.ch + 1), {className: style}));
  92.         if (match.to && cm.getLine(match.to.line).length <= maxHighlightLen)
  93.           marks.push(cm.markText(match.to, Pos(match.to.line, match.to.ch + 1), {className: style}));
  94.       }
  95.     }
  96.  
  97.     if (marks.length) {
  98.       // Kludge to work around the IE bug from issue #1193, where text
  99.       // input stops going to the textarea whenever this fires.
  100.       if (ie_lt8 && cm.state.focused) cm.focus();
  101.  
  102.       var clear = function() {
  103.         cm.operation(function() {
  104.           for (var i = 0; i < marks.length; i++) marks[i].clear();
  105.         });
  106.       };
  107.       if (autoclear) setTimeout(clear, 800);
  108.       else return clear;
  109.     }
  110.   }
  111.  
  112.   function doMatchBrackets(cm) {
  113.     cm.operation(function() {
  114.       if (cm.state.matchBrackets.currentlyHighlighted) {
  115.         cm.state.matchBrackets.currentlyHighlighted();
  116.         cm.state.matchBrackets.currentlyHighlighted = null;
  117.       }
  118.       cm.state.matchBrackets.currentlyHighlighted = matchBrackets(cm, false, cm.state.matchBrackets);
  119.     });
  120.   }
  121.  
  122.   function clearHighlighted(cm) {
  123.     if (cm.state.matchBrackets && cm.state.matchBrackets.currentlyHighlighted) {
  124.       cm.state.matchBrackets.currentlyHighlighted();
  125.       cm.state.matchBrackets.currentlyHighlighted = null;
  126.     }
  127.   }
  128.  
  129.   CodeMirror.defineOption("matchBrackets", false, function(cm, val, old) {
  130.     if (old && old != CodeMirror.Init) {
  131.       cm.off("cursorActivity", doMatchBrackets);
  132.       cm.off("focus", doMatchBrackets)
  133.       cm.off("blur", clearHighlighted)
  134.       clearHighlighted(cm);
  135.     }
  136.     if (val) {
  137.       cm.state.matchBrackets = typeof val == "object" ? val : {};
  138.       cm.on("cursorActivity", doMatchBrackets);
  139.       cm.on("focus", doMatchBrackets)
  140.       cm.on("blur", clearHighlighted)
  141.     }
  142.   });
  143.  
  144.   CodeMirror.defineExtension("matchBrackets", function() {matchBrackets(this, true);});
  145.   CodeMirror.defineExtension("findMatchingBracket", function(pos, config, oldConfig){
  146.     // Backwards-compatibility kludge
  147.     if (oldConfig || typeof config == "boolean") {
  148.       if (!oldConfig) {
  149.         config = config ? {strict: true} : null
  150.       } else {
  151.         oldConfig.strict = config
  152.         config = oldConfig
  153.       }
  154.     }
  155.     return findMatchingBracket(this, pos, config)
  156.   });
  157.   CodeMirror.defineExtension("scanForBracket", function(pos, dir, style, config){
  158.     return scanForBracket(this, pos, dir, style, config);
  159.   });
  160. });
  161.