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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// Highlighting text that matches the selection
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//
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// Defines an option highlightSelectionMatches, which, when enabled,
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// will style strings that match the selection throughout the
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// document.
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//
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// The option can be set to true to simply enable it, or to a
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// {minChars, style, wordsOnly, showToken, delay} object to explicitly
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// configure it. minChars is the minimum amount of characters that should be
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// selected for the behavior to occur, and style is the token style to
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// apply to the matches. This will be prefixed by "cm-" to create an
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// actual CSS class name. If wordsOnly is enabled, the matches will be
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// highlighted only if the selected text is a word. showToken, when enabled,
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// will cause the current token to be highlighted when nothing is selected.
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// delay is used to specify how much time to wait, in milliseconds, before
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// highlighting the matches. If annotateScrollbar is enabled, the occurrences
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// will be highlighted on the scrollbar via the matchesonscrollbar addon.
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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"), require("./matchesonscrollbar"));
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  else if (typeof define == "function" && define.amd) // AMD
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    define(["../../lib/codemirror", "./matchesonscrollbar"], 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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  "use strict";
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  var defaults = {
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    style: "matchhighlight",
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    minChars: 2,
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    delay: 100,
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    wordsOnly: false,
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    annotateScrollbar: false,
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    showToken: false,
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    trim: true
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  }
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  function State(options) {
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    this.options = {}
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    for (var name in defaults)
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      this.options[name] = (options && options.hasOwnProperty(name) ? options : defaults)[name]
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    this.overlay = this.timeout = null;
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    this.matchesonscroll = null;
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    this.active = false;
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  }
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  CodeMirror.defineOption("highlightSelectionMatches", false, function(cm, val, old) {
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    if (old && old != CodeMirror.Init) {
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      removeOverlay(cm);
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      clearTimeout(cm.state.matchHighlighter.timeout);
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      cm.state.matchHighlighter = null;
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      cm.off("cursorActivity", cursorActivity);
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      cm.off("focus", onFocus)
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    }
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    if (val) {
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      var state = cm.state.matchHighlighter = new State(val);
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      if (cm.hasFocus()) {
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        state.active = true
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        highlightMatches(cm)
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      } else {
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        cm.on("focus", onFocus)
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      }
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      cm.on("cursorActivity", cursorActivity);
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    }
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  });
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  function cursorActivity(cm) {
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    var state = cm.state.matchHighlighter;
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    if (state.active || cm.hasFocus()) scheduleHighlight(cm, state)
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  }
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  function onFocus(cm) {
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    var state = cm.state.matchHighlighter
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    if (!state.active) {
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      state.active = true
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      scheduleHighlight(cm, state)
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    }
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  }
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  function scheduleHighlight(cm, state) {
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    clearTimeout(state.timeout);
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    state.timeout = setTimeout(function() {highlightMatches(cm);}, state.options.delay);
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  }
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  function addOverlay(cm, query, hasBoundary, style) {
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    var state = cm.state.matchHighlighter;
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    cm.addOverlay(state.overlay = makeOverlay(query, hasBoundary, style));
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    if (state.options.annotateScrollbar && cm.showMatchesOnScrollbar) {
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      var searchFor = hasBoundary ? new RegExp((/\w/.test(query.charAt(0)) ? "\\b" : "") +
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                                               query.replace(/[\\\[.+*?(){|^$]/g, "\\$&") +
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                                               (/\w/.test(query.charAt(query.length - 1)) ? "\\b" : "")) : query;
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      state.matchesonscroll = cm.showMatchesOnScrollbar(searchFor, false,
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        {className: "CodeMirror-selection-highlight-scrollbar"});
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    }
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  }
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  function removeOverlay(cm) {
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    var state = cm.state.matchHighlighter;
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    if (state.overlay) {
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      cm.removeOverlay(state.overlay);
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      state.overlay = null;
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      if (state.matchesonscroll) {
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        state.matchesonscroll.clear();
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        state.matchesonscroll = null;
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      }
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    }
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  }
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  function highlightMatches(cm) {
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    cm.operation(function() {
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      var state = cm.state.matchHighlighter;
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      removeOverlay(cm);
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      if (!cm.somethingSelected() && state.options.showToken) {
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        var re = state.options.showToken === true ? /[\w$]/ : state.options.showToken;
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        var cur = cm.getCursor(), line = cm.getLine(cur.line), start = cur.ch, end = start;
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        while (start && re.test(line.charAt(start - 1))) --start;
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        while (end < line.length && re.test(line.charAt(end))) ++end;
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        if (start < end)
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          addOverlay(cm, line.slice(start, end), re, state.options.style);
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        return;
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      }
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      var from = cm.getCursor("from"), to = cm.getCursor("to");
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      if (from.line != to.line) return;
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      if (state.options.wordsOnly && !isWord(cm, from, to)) return;
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      var selection = cm.getRange(from, to)
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      if (state.options.trim) selection = selection.replace(/^\s+|\s+$/g, "")
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      if (selection.length >= state.options.minChars)
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        addOverlay(cm, selection, false, state.options.style);
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    });
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  }
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  function isWord(cm, from, to) {
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    var str = cm.getRange(from, to);
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    if (str.match(/^\w+$/) !== null) {
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        if (from.ch > 0) {
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            var pos = {line: from.line, ch: from.ch - 1};
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            var chr = cm.getRange(pos, from);
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            if (chr.match(/\W/) === null) return false;
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        }
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        if (to.ch < cm.getLine(from.line).length) {
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            var pos = {line: to.line, ch: to.ch + 1};
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            var chr = cm.getRange(to, pos);
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            if (chr.match(/\W/) === null) return false;
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        }
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        return true;
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    } else return false;
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  }
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  function boundariesAround(stream, re) {
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    return (!stream.start || !re.test(stream.string.charAt(stream.start - 1))) &&
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      (stream.pos == stream.string.length || !re.test(stream.string.charAt(stream.pos)));
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  }
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  function makeOverlay(query, hasBoundary, style) {
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    return {token: function(stream) {
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      if (stream.match(query) &&
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          (!hasBoundary || boundariesAround(stream, hasBoundary)))
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        return style;
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      stream.next();
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      stream.skipTo(query.charAt(0)) || stream.skipToEnd();
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    }};
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  }
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});
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