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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  "use strict";
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  var WRAP_CLASS = "CodeMirror-activeline";
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  var BACK_CLASS = "CodeMirror-activeline-background";
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  var GUTT_CLASS = "CodeMirror-activeline-gutter";
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  CodeMirror.defineOption("styleActiveLine", false, function(cm, val, old) {
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    var prev = old == CodeMirror.Init ? false : old;
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    if (val == prev) return
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    if (prev) {
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      cm.off("beforeSelectionChange", selectionChange);
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      clearActiveLines(cm);
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      delete cm.state.activeLines;
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    }
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    if (val) {
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      cm.state.activeLines = [];
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      updateActiveLines(cm, cm.listSelections());
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      cm.on("beforeSelectionChange", selectionChange);
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    }
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  });
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  function clearActiveLines(cm) {
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    for (var i = 0; i < cm.state.activeLines.length; i++) {
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      cm.removeLineClass(cm.state.activeLines[i], "wrap", WRAP_CLASS);
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      cm.removeLineClass(cm.state.activeLines[i], "background", BACK_CLASS);
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      cm.removeLineClass(cm.state.activeLines[i], "gutter", GUTT_CLASS);
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    }
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  }
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  function sameArray(a, b) {
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    if (a.length != b.length) return false;
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    for (var i = 0; i < a.length; i++)
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      if (a[i] != b[i]) return false;
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    return true;
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  }
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  function updateActiveLines(cm, ranges) {
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    var active = [];
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    for (var i = 0; i < ranges.length; i++) {
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      var range = ranges[i];
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      var option = cm.getOption("styleActiveLine");
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      if (typeof option == "object" && option.nonEmpty ? range.anchor.line != range.head.line : !range.empty())
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        continue
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      var line = cm.getLineHandleVisualStart(range.head.line);
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      if (active[active.length - 1] != line) active.push(line);
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    }
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    if (sameArray(cm.state.activeLines, active)) return;
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    cm.operation(function() {
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      clearActiveLines(cm);
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      for (var i = 0; i < active.length; i++) {
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        cm.addLineClass(active[i], "wrap", WRAP_CLASS);
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        cm.addLineClass(active[i], "background", BACK_CLASS);
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        cm.addLineClass(active[i], "gutter", GUTT_CLASS);
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      }
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      cm.state.activeLines = active;
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    });
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  }
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  function selectionChange(cm, sel) {
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    updateActiveLines(cm, sel.ranges);
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  }
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});
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