text: // CodeMirror, copyright (c) by Marijn Haverbeke and others
  // Distributed under an MIT license: http://CodeMirror.net/LICENSE
  
  // Highlighting text that matches the selection
  //
  // Defines an option highlightSelectionMatches, which, when enabled,
  // will style strings that match the selection throughout the
  // document.
  //
  // The option can be set to true to simply enable it, or to a
  // {minChars, style, wordsOnly, showToken, delay} object to explicitly
  // configure it. minChars is the minimum amount of characters that should be
  // selected for the behavior to occur, and style is the token style to
  // apply to the matches. This will be prefixed by "cm-" to create an
  // actual CSS class name. If wordsOnly is enabled, the matches will be
  // highlighted only if the selected text is a word. showToken, when enabled,
  // will cause the current token to be highlighted when nothing is selected.
  // delay is used to specify how much time to wait, in milliseconds, before
  // highlighting the matches.
  
  (function(mod) {
    if (typeof exports == "object" && typeof module == "object") // CommonJS
      mod(require("../../lib/CodeMirror"));
    else if (typeof define == "function" && define.amd) // AMD
      define(["../../lib/CodeMirror"], mod);
    else // Plain browser env
      mod(CodeMirror);
  })(function(CodeMirror) {
    "use strict";
  
    var DEFAULT_MIN_CHARS = 2;
    var DEFAULT_TOKEN_STYLE = "matchhighlight";
    var DEFAULT_DELAY = 100;
    var DEFAULT_WORDS_ONLY = false;
  
    function State(options) {
      if (typeof options == "object") {
        this.minChars = options.minChars;
        this.style = options.style;
        this.showToken = options.showToken;
        this.delay = options.delay;
        this.wordsOnly = options.wordsOnly;
      }
      if (this.style == null) this.style = DEFAULT_TOKEN_STYLE;
      if (this.minChars == null) this.minChars = DEFAULT_MIN_CHARS;
      if (this.delay == null) this.delay = DEFAULT_DELAY;
      if (this.wordsOnly == null) this.wordsOnly = DEFAULT_WORDS_ONLY;
      this.overlay = this.timeout = null;
    }
  
    CodeMirror.defineOption("highlightSelectionMatches", false, function(cm, val, old) {
      if (old && old != CodeMirror.Init) {
        var over = cm.state.matchHighlighter.overlay;
        if (over) cm.removeOverlay(over);
        clearTimeout(cm.state.matchHighlighter.timeout);
        cm.state.matchHighlighter = null;
        cm.off("cursorActivity", cursorActivity);
      }
      if (val) {
        cm.state.matchHighlighter = new State(val);
        highlightMatches(cm);
        cm.on("cursorActivity", cursorActivity);
      }
    });
  
    function cursorActivity(cm) {
      var state = cm.state.matchHighlighter;
      clearTimeout(state.timeout);
      state.timeout = setTimeout(function() {highlightMatches(cm);}, state.delay);
    }
  
    function highlightMatches(cm) {
      cm.operation(function() {
        var state = cm.state.matchHighlighter;
        if (state.overlay) {
          cm.removeOverlay(state.overlay);
          state.overlay = null;
        }
        if (!cm.somethingSelected() && state.showToken) {
          var re = state.showToken === true ? /[\w$]/ : state.showToken;
          var cur = cm.getCursor(), line = cm.getLine(cur.line), start = cur.ch, end = start;
          while (start && re.test(line.charAt(start - 1))) --start;
          while (end < line.length && re.test(line.charAt(end))) ++end;
          if (start < end)
            cm.addOverlay(state.overlay = makeOverlay(line.slice(start, end), re, state.style));
          return;
        }
        var from = cm.getCursor("from"), to = cm.getCursor("to");
        if (from.line != to.line) return;
        if (state.wordsOnly && !isWord(cm, from, to)) return;
        var selection = cm.getRange(from, to).replace(/^\s+|\s+$/g, "");
        if (selection.length >= state.minChars)
          cm.addOverlay(state.overlay = makeOverlay(selection, false, state.style));
      });
    }
  
    function isWord(cm, from, to) {
      var str = cm.getRange(from, to);
      if (str.match(/^\w+$/) !== null) {
          if (from.ch > 0) {
              var pos = {line: from.line, ch: from.ch - 1};
              var chr = cm.getRange(pos, from);
              if (chr.match(/\W/) === null) return false;
          }
          if (to.ch < cm.getLine(from.line).length) {
              var pos = {line: to.line, ch: to.ch + 1};
              var chr = cm.getRange(to, pos);
              if (chr.match(/\W/) === null) return false;
          }
          return true;
      } else return false;
    }
  
    function boundariesAround(stream, re) {
      return (!stream.start || !re.test(stream.string.charAt(stream.start - 1))) &&
        (stream.pos == stream.string.length || !re.test(stream.string.charAt(stream.pos)));
    }
  
    function makeOverlay(query, hasBoundary, style) {
      return {token: function(stream) {
        if (stream.match(query) &&
            (!hasBoundary || boundariesAround(stream, hasBoundary)))
          return style;
        stream.next();
        stream.skipTo(query.charAt(0)) || stream.skipToEnd();
      }};
    }
  });
  