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File: agent.js
define(['jquery'], function ($) {
  var isSupportAmd = typeof define === 'function' && define.amd;

  /**
   * returns whether font is installed or not.
   *
   * @param {String} fontName
   * @return {Boolean}
   */
  var isFontInstalled = function (fontName) {
    var testFontName = fontName === 'Comic Sans MS' ? 'Courier New' : 'Comic Sans MS';
    var $tester = $('<div>').css({
      position: 'absolute',
      left: '-9999px',
      top: '-9999px',
      fontSize: '200px'
    }).text('mmmmmmmmmwwwwwww').appendTo(document.body);

    var originalWidth = $tester.css('fontFamily', testFontName).width();
    var width = $tester.css('fontFamily', fontName + ',' + testFontName).width();

    $tester.remove();

    return originalWidth !== width;
  };

  var userAgent = navigator.userAgent;
  var isMSIE = /MSIE|Trident/i.test(userAgent);
  var browserVersion;
  if (isMSIE) {
    var matches = /MSIE (\d+[.]\d+)/.exec(userAgent);
    if (matches) {
      browserVersion = parseFloat(matches[1]);
    }
    matches = /Trident\/.*rv:([0-9]{1,}[\.0-9]{0,})/.exec(userAgent);
    if (matches) {
      browserVersion = parseFloat(matches[1]);
    }
  }

  var isEdge = /Edge\/\d+/.test(userAgent);

  var hasCodeMirror = !!window.CodeMirror;
  if (!hasCodeMirror && isSupportAmd && require) {
    if (require.hasOwnProperty('resolve')) {
      try {
        // If CodeMirror can't be resolved, `require.resolve` will throw an
        // exception and `hasCodeMirror` won't be set to `true`.
        require.resolve('codemirror');
        hasCodeMirror = true;
      } catch (e) {
        hasCodeMirror = false;
      }
    } else if (require.hasOwnProperty('specified')) {
      hasCodeMirror = require.specified('codemirror');
    }
  }

  /**
   * @class core.agent
   *
   * Object which check platform and agent
   *
   * @singleton
   * @alternateClassName agent
   */
  var agent = {
    isMac: navigator.appVersion.indexOf('Mac') > -1,
    isMSIE: isMSIE,
    isEdge: isEdge,
    isFF: !isEdge && /firefox/i.test(userAgent),
    isPhantom: /PhantomJS/i.test(userAgent),
    isWebkit: !isEdge && /webkit/i.test(userAgent),
    isChrome: !isEdge && /chrome/i.test(userAgent),
    isSafari: !isEdge && /safari/i.test(userAgent),
    browserVersion: browserVersion,
    jqueryVersion: parseFloat($.fn.jquery),
    isSupportAmd: isSupportAmd,
    hasCodeMirror: hasCodeMirror,
    isFontInstalled: isFontInstalled,
    isW3CRangeSupport: !!document.createRange
  };

  return agent;
});