GPQAPP

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// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: https://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 bracketRegex(config) {
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    return config && config.bracketRegex || /[(){}[\]]/
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  }
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  function findMatchingBracket(cm, where, config) {
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    var line = cm.getLineHandle(where.line), pos = where.ch - 1;
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    var afterCursor = config && config.afterCursor
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    if (afterCursor == null)
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      afterCursor = /(^| )cm-fat-cursor($| )/.test(cm.getWrapperElement().className)
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    var re = bracketRegex(config)
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    // A cursor is defined as between two characters, but in in vim command mode
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    // (i.e. not insert mode), the cursor is visually represented as a
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    // highlighted box on top of the 2nd character. Otherwise, we allow matches
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    // from before or after the cursor.
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    var match = (!afterCursor && pos >= 0 && re.test(line.text.charAt(pos)) && matching[line.text.charAt(pos)]) ||
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        re.test(line.text.charAt(pos + 1)) && 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 (config && config.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, 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 = bracketRegex(config)
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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 ||
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                            (cm.getTokenTypeAt(Pos(lineNo, pos + 1)) || "") == (style || ""))) {
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          var match = matching[ch];
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          if (match && (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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      highlightNonMatching = config && config.highlightNonMatching;
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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, config);
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      if (match && (match.match || highlightNonMatching !== false) && 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 textarea whenever 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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  function doMatchBrackets(cm) {
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    cm.operation(function() {
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      if (cm.state.matchBrackets.currentlyHighlighted) {
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        cm.state.matchBrackets.currentlyHighlighted();
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        cm.state.matchBrackets.currentlyHighlighted = null;
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      }
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      cm.state.matchBrackets.currentlyHighlighted = matchBrackets(cm, false, cm.state.matchBrackets);
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    });
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  }
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  function clearHighlighted(cm) {
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    if (cm.state.matchBrackets && cm.state.matchBrackets.currentlyHighlighted) {
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      cm.state.matchBrackets.currentlyHighlighted();
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      cm.state.matchBrackets.currentlyHighlighted = null;
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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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      cm.off("focus", doMatchBrackets)
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      cm.off("blur", clearHighlighted)
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      clearHighlighted(cm);
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    }
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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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      cm.on("focus", doMatchBrackets)
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      cm.on("blur", clearHighlighted)
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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, config, oldConfig){
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    // Backwards-compatibility kludge
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    if (oldConfig || typeof config == "boolean") {
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      if (!oldConfig) {
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        config = config ? {strict: true} : null
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      } else {
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        oldConfig.strict = config
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        config = oldConfig
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      }
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    }
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    return findMatchingBracket(this, pos, 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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