webogram-i2p/app/js/lib/polyfill.js

// Console-polyfill. MIT license.
// https://github.com/paulmillr/console-polyfill
// Make it safe to do console.log() always.
(function (con) {
  'use strict';
  var prop, method;
  var empty = {};
  var dummy = function() {};
  var properties = 'memory'.split(',');
  var methods = ('assert,count,debug,dir,dirxml,error,exception,group,' +
     'groupCollapsed,groupEnd,info,log,markTimeline,profile,profileEnd,' +
     'time,timeEnd,trace,warn').split(',');
  while (prop = properties.pop()) con[prop] = con[prop] || empty;
  while (method = methods.pop()) con[method] = con[method] || dummy;
})(this.console = this.console || {});


/* Array.indexOf polyfill */
if (!Array.prototype.indexOf) {
  Array.prototype.indexOf = function(searchElement, fromIndex) {
    var k;
    if (this == null) {
      throw new TypeError('"this" is null or not defined');
    }

    var O = Object(this);
    var len = O.length >>> 0;
    if (len === 0) {
      return -1;
    }
    var n = +fromIndex || 0;

    if (Math.abs(n) === Infinity) {
      n = 0;
    }
    if (n >= len) {
      return -1;
    }
    k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);
    while (k < len) {
      if (k in O && O[k] === searchElement) {
        return k;
      }
      k++;
    }
    return -1;
  };
}

/* Array.isArray polyfill */
if (!Array.isArray) {
  Array.isArray = function(arg) {
    return Object.prototype.toString.call(arg) === '[object Array]';
  };
}

/* Object.create polyfill */
if (typeof Object.create != 'function') {
  Object.create = (function() {
    var Object = function() {};
    return function (prototype) {
      if (arguments.length > 1) {
        throw Error('Second argument not supported');
      }
      if (typeof prototype != 'object') {
        throw TypeError('Argument must be an object');
      }
      Object.prototype = prototype;
      var result = new Object();
      Object.prototype = null;
      return result;
    };
  })();
}

/* Function.bind polyfill */
if (!Function.prototype.bind) {
  Function.prototype.bind = function (oThis) {
    if (typeof this !== "function") {
      throw new TypeError("Function.prototype.bind - what is trying to be bound is not callable"); 
    }

    var aArgs = Array.prototype.slice.call(arguments, 1), 
        fToBind = this, 
        fNOP = function () {},
        fBound = function () {
          return fToBind.apply(this instanceof fNOP && oThis
                 ? this
                 : oThis,
                 aArgs.concat(Array.prototype.slice.call(arguments)));
        };

    fNOP.prototype = this.prototype;
    fBound.prototype = new fNOP();

    return fBound;
  };
}

/* setZeroTimeout polyfill, from http://dbaron.org/log/20100309-faster-timeouts */
(function(global) {
  var timeouts = [];
  var messageName = 'zero-timeout-message';

  function setZeroTimeout(fn) {
    timeouts.push(fn);
    global.postMessage(messageName, '*');
  }

  function handleMessage(event) {
    if (event.source == global && event.data == messageName) {
      event.stopPropagation();
      if (timeouts.length > 0) {
        var fn = timeouts.shift();
        fn();
      }
    }
  }

  global.addEventListener('message', handleMessage, true);

  var originalSetTimeout = global.setTimeout;
  global.setTimeout = function (callback, delay) {
    if (!delay || delay <= 5) {
      return setZeroTimeout(callback);
    }
    return originalSetTimeout(callback, delay);
  };

  global.setZeroTimeout = setZeroTimeout;
})(this);