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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// Because sometimes you need to mark the selected *text*.
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//
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// Adds an option 'styleSelectedText' which, when enabled, gives
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// selected text the CSS class given as option value, or
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// "CodeMirror-selectedtext" when the value is not a string.
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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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  "use strict";
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  CodeMirror.defineOption("styleSelectedText", false, function(cm, val, old) {
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    var prev = old && old != CodeMirror.Init;
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    if (val && !prev) {
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      cm.state.markedSelection = [];
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      cm.state.markedSelectionStyle = typeof val == "string" ? val : "CodeMirror-selectedtext";
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      reset(cm);
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      cm.on("cursorActivity", onCursorActivity);
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      cm.on("change", onChange);
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    } else if (!val && prev) {
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      cm.off("cursorActivity", onCursorActivity);
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      cm.off("change", onChange);
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      clear(cm);
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      cm.state.markedSelection = cm.state.markedSelectionStyle = null;
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    }
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  });
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  function onCursorActivity(cm) {
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    if (cm.state.markedSelection)
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      cm.operation(function() { update(cm); });
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  }
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  function onChange(cm) {
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    if (cm.state.markedSelection && cm.state.markedSelection.length)
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      cm.operation(function() { clear(cm); });
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  }
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  var CHUNK_SIZE = 8;
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  var Pos = CodeMirror.Pos;
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  var cmp = CodeMirror.cmpPos;
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  function coverRange(cm, from, to, addAt) {
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    if (cmp(from, to) == 0) return;
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    var array = cm.state.markedSelection;
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    var cls = cm.state.markedSelectionStyle;
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    for (var line = from.line;;) {
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      var start = line == from.line ? from : Pos(line, 0);
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      var endLine = line + CHUNK_SIZE, atEnd = endLine >= to.line;
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      var end = atEnd ? to : Pos(endLine, 0);
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      var mark = cm.markText(start, end, {className: cls});
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      if (addAt == null) array.push(mark);
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      else array.splice(addAt++, 0, mark);
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      if (atEnd) break;
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      line = endLine;
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    }
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  }
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  function clear(cm) {
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    var array = cm.state.markedSelection;
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    for (var i = 0; i < array.length; ++i) array[i].clear();
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    array.length = 0;
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  }
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  function reset(cm) {
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    clear(cm);
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    var ranges = cm.listSelections();
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    for (var i = 0; i < ranges.length; i++)
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      coverRange(cm, ranges[i].from(), ranges[i].to());
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  }
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  function update(cm) {
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    if (!cm.somethingSelected()) return clear(cm);
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    if (cm.listSelections().length > 1) return reset(cm);
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    var from = cm.getCursor("start"), to = cm.getCursor("end");
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    var array = cm.state.markedSelection;
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    if (!array.length) return coverRange(cm, from, to);
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    var coverStart = array[0].find(), coverEnd = array[array.length - 1].find();
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    if (!coverStart || !coverEnd || to.line - from.line <= CHUNK_SIZE ||
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        cmp(from, coverEnd.to) >= 0 || cmp(to, coverStart.from) <= 0)
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      return reset(cm);
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    while (cmp(from, coverStart.from) > 0) {
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      array.shift().clear();
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      coverStart = array[0].find();
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    }
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    if (cmp(from, coverStart.from) < 0) {
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      if (coverStart.to.line - from.line < CHUNK_SIZE) {
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        array.shift().clear();
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        coverRange(cm, from, coverStart.to, 0);
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      } else {
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        coverRange(cm, from, coverStart.from, 0);
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      }
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    }
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    while (cmp(to, coverEnd.to) < 0) {
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      array.pop().clear();
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      coverEnd = array[array.length - 1].find();
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    }
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    if (cmp(to, coverEnd.to) > 0) {
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      if (to.line - coverEnd.from.line < CHUNK_SIZE) {
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        array.pop().clear();
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        coverRange(cm, coverEnd.from, to);
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      } else {
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        coverRange(cm, coverEnd.to, to);
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      }
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    }
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  }
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});
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