// 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. If annotateScrollbar is enabled, the occurences
// will be highlighted on the scrollbar via the matchesonscrollbar addon.

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"), require("./matchesonscrollbar"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror", "./matchesonscrollbar"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
  "use strict";

  var defaults = {
    style: "matchhighlight",
    minChars: 2,
    delay: 100,
    wordsOnly: false,
    annotateScrollbar: false,
    showToken: false,
    trim: true
  }

  function State(options) {
    this.options = {}
    for (var name in defaults)
      this.options[name] = (options && options.hasOwnProperty(name) ? options : defaults)[name]
    this.overlay = this.timeout = null;
    this.matchesonscroll = null;
    this.active = false;
  }

  CodeMirror.defineOption("highlightSelectionMatches", false, function(cm, val, old) {
    if (old && old != CodeMirror.Init) {
      removeOverlay(cm);
      clearTimeout(cm.state.matchHighlighter.timeout);
      cm.state.matchHighlighter = null;
      cm.off("cursorActivity", cursorActivity);
      cm.off("focus", onFocus)
    }
    if (val) {
      var state = cm.state.matchHighlighter = new State(val);
      if (cm.hasFocus()) {
        state.active = true
        highlightMatches(cm)
      } else {
        cm.on("focus", onFocus)
      }
      cm.on("cursorActivity", cursorActivity);
    }
  });

  function cursorActivity(cm) {
    var state = cm.state.matchHighlighter;
    if (state.active || cm.hasFocus()) scheduleHighlight(cm, state)
  }

  function onFocus(cm) {
    var state = cm.state.matchHighlighter
    if (!state.active) {
      state.active = true
      scheduleHighlight(cm, state)
    }
  }

  function scheduleHighlight(cm, state) {
    clearTimeout(state.timeout);
    state.timeout = setTimeout(function() {highlightMatches(cm);}, state.options.delay);
  }

  function addOverlay(cm, query, hasBoundary, style) {
    var state = cm.state.matchHighlighter;
    cm.addOverlay(state.overlay = makeOverlay(query, hasBoundary, style));
    if (state.options.annotateScrollbar && cm.showMatchesOnScrollbar) {
      var searchFor = hasBoundary ? new RegExp("\\b" + query + "\\b") : query;
      state.matchesonscroll = cm.showMatchesOnScrollbar(searchFor, false,
        {className: "CodeMirror-selection-highlight-scrollbar"});
    }
  }

  function removeOverlay(cm) {
    var state = cm.state.matchHighlighter;
    if (state.overlay) {
      cm.removeOverlay(state.overlay);
      state.overlay = null;
      if (state.matchesonscroll) {
        state.matchesonscroll.clear();
        state.matchesonscroll = null;
      }
    }
  }

  function highlightMatches(cm) {
    cm.operation(function() {
      var state = cm.state.matchHighlighter;
      removeOverlay(cm);
      if (!cm.somethingSelected() && state.options.showToken) {
        var re = state.options.showToken === true ? /[\w$]/ : state.options.showToken;
        var cur = cm.getCursor(), line = cm.getLine(cur.line), start = cur.ch, end = start;
        while (start && re.test(line.charAt(start - 1))) --start;
        while (end < line.length && re.test(line.charAt(end))) ++end;
        if (start < end)
          addOverlay(cm, line.slice(start, end), re, state.options.style);
        return;
      }
      var from = cm.getCursor("from"), to = cm.getCursor("to");
      if (from.line != to.line) return;
      if (state.options.wordsOnly && !isWord(cm, from, to)) return;
      var selection = cm.getRange(from, to)
      if (state.options.trim) selection = selection.replace(/^\s+|\s+$/g, "")
      if (selection.length >= state.options.minChars)
        addOverlay(cm, selection, false, state.options.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();
    }};
  }
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