src/polyfills.js

/**
 * @file shims
 * @private
 * @author Alexander Rose <alexander.rose@weirdbyte.de>
 */

/// ///////////
// Polyfills

if (typeof window !== 'undefined') {
  (function () {
    'use strict'
    // Console-polyfill. MIT license.
    // https://github.com/paulmillr/console-polyfill
    // Make it safe to do console.log() always.

    window.console = window.console || {}
    var con = window.console
    var prop, method
    var empty = {}
    var dummy = function () {}
    var properties = 'memory'.split(',')
    var methods = (
      'assert,clear,count,debug,dir,dirxml,error,exception,group,' +
      'groupCollapsed,groupEnd,info,log,markTimeline,profile,profiles,profileEnd,' +
      'show,table,time,timeEnd,timeline,timelineEnd,timeStamp,trace,warn'
    ).split(',')

    while ((prop = properties.pop())) if (!con[prop]) con[prop] = empty
    while ((method = methods.pop())) if (!con[method]) con[method] = dummy
  })()
}

if (typeof window.HTMLCanvasElement !== 'undefined' && !window.HTMLCanvasElement.prototype.toBlob) {
  // http://code.google.com/p/chromium/issues/detail?id=67587#57
  Object.defineProperty(window.HTMLCanvasElement.prototype, 'toBlob', {

    value: function (callback, type, quality) {
      var bin = window.atob(this.toDataURL(type, quality).split(',')[ 1 ])
      var len = bin.length
      var len32 = len >> 2
      var a8 = new Uint8Array(len)
      var a32 = new Uint32Array(a8.buffer, 0, len32)

      for (var i = 0, j = 0; i < len32; i++) {
        a32[i] = (
          bin.charCodeAt(j++) |
          bin.charCodeAt(j++) << 8 |
          bin.charCodeAt(j++) << 16 |
          bin.charCodeAt(j++) << 24
        )
      }

      var tailLength = len & 3

      while (tailLength--) {
        a8[ j ] = bin.charCodeAt(j++)
      }

      callback(new window.Blob([ a8 ], { 'type': type || 'image/png' }))
    }

  })
}

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/cbrt
Math.cbrt = Math.cbrt || function (x) {
  var y = Math.pow(Math.abs(x), 1 / 3)
  return x < 0 ? -y : y
}

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sign
if (!Math.sign) {
  Math.sign = function (x) {
    // If x is NaN, the result is NaN.
    // If x is -0, the result is -0.
    // If x is +0, the result is +0.
    // If x is negative and not -0, the result is -1.
    // If x is positive and not +0, the result is +1.
    x = +x // convert to a number
    if (x === 0 || isNaN(x)) {
      return Number(x)
    }
    return x > 0 ? 1 : -1
  }
}

if (!Number.isInteger) {
  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger
  Number.isInteger = function isInteger (nVal) {
    return typeof nVal === 'number' && isFinite(nVal) && nVal > -9007199254740992 && nVal < 9007199254740992 && Math.floor(nVal) === nVal
  }
}

if (!Number.isNaN) {
  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN
  Number.isNaN = function isNaN (value) {
    return value !== value  // eslint-disable-line no-self-compare
  }
}

if (!Object.assign) {
  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
  Object.defineProperty(Object, 'assign', {

    enumerable: false,
    configurable: true,
    writable: true,

    value: function (target/*, firstSource */) {
      'use strict'
      if (target === undefined || target === null) { throw new TypeError('Cannot convert first argument to object') }

      var to = Object(target)

      var hasPendingException = false
      var pendingException

      for (var i = 1; i < arguments.length; i++) {
        var nextSource = arguments[i]
        if (nextSource === undefined || nextSource === null) { continue }

        var keysArray = Object.keys(Object(nextSource))
        for (var nextIndex = 0, len = keysArray.length; nextIndex < len; nextIndex++) {
          var nextKey = keysArray[nextIndex]
          try {
            var desc = Object.getOwnPropertyDescriptor(nextSource, nextKey)
            if (desc !== undefined && desc.enumerable) { to[nextKey] = nextSource[nextKey] }
          } catch (e) {
            if (!hasPendingException) {
              hasPendingException = true
              pendingException = e
            }
          }
        }

        if (hasPendingException) { throw pendingException }
      }

      return to
    }

  })
}

if (!String.prototype.startsWith) {
  /*! https://mths.be/startswith v0.2.0 by @mathias */

  (function () {
    'use strict' // needed to support `apply`/`call` with `undefined`/`null`
    var defineProperty = (function () {
            // IE 8 only supports `Object.defineProperty` on DOM elements
      var result
      try {
        var object = {}
        var $defineProperty = Object.defineProperty
        result = $defineProperty(object, object, object) && $defineProperty
      } catch (error) {}  // eslint-disable-line no-empty
      return result
    }())
    var toString = {}.toString
    var startsWith = function (search) {
      if (this === null) {
        throw TypeError()
      }
      var string = String(this)
      if (search && toString.call(search) === '[object RegExp]') {
        throw TypeError()
      }
      var stringLength = string.length
      var searchString = String(search)
      var searchLength = searchString.length
      var position = arguments.length > 1 ? arguments[1] : undefined
      // `ToInteger`
      var pos = position ? Number(position) : 0
      if (Number.isNaN(pos)) {
        pos = 0
      }
      var start = Math.min(Math.max(pos, 0), stringLength)
      // Avoid the `indexOf` call if no match is possible
      if (searchLength + start > stringLength) {
        return false
      }
      var index = -1
      while (++index < searchLength) {
        if (string.charCodeAt(start + index) !== searchString.charCodeAt(index)) {
          return false
        }
      }
      return true
    }
    if (defineProperty) {
      defineProperty(String.prototype, 'startsWith', {
        'value': startsWith,
        'configurable': true,
        'writable': true
      })
    } else {
      // eslint-disable-next-line no-extend-native
      String.prototype.startsWith = startsWith
    }
  }())
}

if (!String.prototype.endsWith) {
  // eslint-disable-next-line no-extend-native
  String.prototype.endsWith = function (searchString, position) {
    var subjectString = this.toString()
    if (typeof position !== 'number' || !isFinite(position) || Math.floor(position) !== position || position > subjectString.length) {
      position = subjectString.length
    }
    position -= searchString.length
    var lastIndex = subjectString.indexOf(searchString, position)
    return lastIndex !== -1 && lastIndex === position
  }
}

if (!String.prototype.repeat) {
  // eslint-disable-next-line no-extend-native
  String.prototype.repeat = function (count) {
    'use strict'
    if (this === null) {
      throw new TypeError('can\'t convert ' + this + ' to object')
    }
    var str = '' + this
    count = +count
    if (Number.isNaN(count)) {
      count = 0
    }
    if (count < 0) {
      throw new RangeError('repeat count must be non-negative')
    }
    if (count === Infinity) {
      throw new RangeError('repeat count must be less than infinity')
    }
    count = Math.floor(count)
    if (str.length === 0 || count === 0) {
      return ''
    }
    // Ensuring count is a 31-bit integer allows us to heavily optimize the
    // main part. But anyway, most current (August 2014) browsers can't handle
    // strings 1 << 28 chars or longer, so:
    if (str.length * count >= 1 << 28) {
      throw new RangeError('repeat count must not overflow maximum string size')
    }
    var rpt = ''
    for (;;) {
      if ((count & 1) === 1) {
        rpt += str
      }
      count >>>= 1
      if (count === 0) {
        break
      }
      str += str
    }
    // Could we try:
    // return Array(count + 1).join(this);
    return rpt
  }
}

if (!String.prototype.includes) {
  // eslint-disable-next-line no-extend-native
  String.prototype.includes = function (search, start) {
    'use strict'
    if (typeof start !== 'number') {
      start = 0
    }

    if (start + search.length > this.length) {
      return false
    } else {
      return this.indexOf(search, start) !== -1
    }
  }
}

if (!Array.prototype.includes) {
  // eslint-disable-next-line no-extend-native
  Array.prototype.includes = function (searchElement /*, fromIndex */) {
    'use strict'
    if (this == null) {
      throw new TypeError('Array.prototype.includes called on null or undefined')
    }

    var O = Object(this)
    var len = parseInt(O.length, 10) || 0
    if (len === 0) {
      return false
    }
    var n = parseInt(arguments[1], 10) || 0
    var k
    if (n >= 0) {
      k = n
    } else {
      k = len + n
      if (k < 0) { k = 0 }
    }
    var currentElement
    while (k < len) {
      currentElement = O[k]
      if (searchElement === currentElement ||
          (Number.isNaN(searchElement) && Number.isNaN(currentElement))
      ) {
        return true
      }
      k++
    }
    return false
  }
}

// Production steps of ECMA-262, Edition 6, 22.1.2.1
// Reference: https://people.mozilla.org/~jorendorff/es6-draft.html#sec-array.from
if (!Array.from) {
  Array.from = (function () {
    var toStr = Object.prototype.toString
    var isCallable = function (fn) {
      return typeof fn === 'function' || toStr.call(fn) === '[object Function]'
    }
    var toInteger = function (value) {
      var number = Number(value)
      if (isNaN(number)) { return 0 }
      if (number === 0 || !isFinite(number)) { return number }
      return (number > 0 ? 1 : -1) * Math.floor(Math.abs(number))
    }
    var maxSafeInteger = Math.pow(2, 53) - 1
    var toLength = function (value) {
      var len = toInteger(value)
      return Math.min(Math.max(len, 0), maxSafeInteger)
    }

    // The length property of the from method is 1.
    return function from (arrayLike/*, mapFn, thisArg */) {
            // 1. Let C be the this value.
      var C = this

      // 2. Let items be ToObject(arrayLike).
      var items = Object(arrayLike)

      // 3. ReturnIfAbrupt(items).
      if (arrayLike == null) {
        throw new TypeError('Array.from requires an array-like object - not null or undefined')
      }

      // 4. If mapfn is undefined, then let mapping be false.
      var mapFn = arguments.length > 1 ? arguments[1] : void undefined
      var T
      if (typeof mapFn !== 'undefined') {
        // 5. else
        // 5. a If IsCallable(mapfn) is false, throw a TypeError exception.
        if (!isCallable(mapFn)) {
          throw new TypeError('Array.from: when provided, the second argument must be a function')
        }

        // 5. b. If thisArg was supplied, let T be thisArg; else let T be undefined.
        if (arguments.length > 2) {
          T = arguments[2]
        }
      }

      // 10. Let lenValue be Get(items, "length").
      // 11. Let len be ToLength(lenValue).
      var len = toLength(items.length)

      // 13. If IsConstructor(C) is true, then
      // 13. a. Let A be the result of calling the [[Construct]] internal method of C with an argument list containing the single item len.
      // 14. a. Else, Let A be ArrayCreate(len).
      var A = isCallable(C) ? Object(new C(len)) : new Array(len)

      // 16. Let k be 0.
      var k = 0
      // 17. Repeat, while k < len… (also steps a - h)
      var kValue
      while (k < len) {
        kValue = items[k]
        if (mapFn) {
          A[k] = typeof T === 'undefined' ? mapFn(kValue, k) : mapFn.call(T, kValue, k)
        } else {
          A[k] = kValue
        }
        k += 1
      }
      // 18. Let putStatus be Put(A, "length", len, true).
      A.length = len
      // 20. Return A.
      return A
    }
  }())
}

if (typeof window !== 'undefined') {
  (function () {
    // http://paulirish.com/2011/requestanimationframe-for-smart-animating/
    // http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating

    // requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel

    // MIT license

    var lastTime = 0
    var vendors = [ 'ms', 'moz', 'webkit', 'o' ]

    for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
      window.requestAnimationFrame = (
        window[ vendors[ x ] + 'RequestAnimationFrame' ]
      )

      window.cancelAnimationFrame = (
        window[ vendors[ x ] + 'CancelAnimationFrame' ] ||
        window[ vendors[ x ] + 'CancelRequestAnimationFrame' ]
      )
    }

    if (!window.requestAnimationFrame) {
      window.requestAnimationFrame = function (callback/*, element */) {
        var currTime = new Date().getTime()
        var timeToCall = Math.max(0, 16 - (currTime - lastTime))

        var id = window.setTimeout(function () {
          var time = currTime + timeToCall
          callback(time)
        }, timeToCall)

        lastTime = currTime + timeToCall

        return id
      }
    }

    if (!window.cancelAnimationFrame) {
      window.cancelAnimationFrame = function (id) {
        clearTimeout(id)
      }
    }
  }())
}

if (Function.prototype.name === undefined && Object.defineProperty !== undefined) {
    // Missing in IE9-11.
    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name

  // eslint-disable-next-line no-extend-native
  Object.defineProperty(Function.prototype, 'name', {

    get: function () {
      return this.toString().match(/^\s*function\s*(\S*)\s*\(/)[ 1 ]
    }

  })
}

if (typeof window !== 'undefined') {
  if (window.performance === undefined) {
    /* global self */
    self.performance = {}
  }

  if (window.performance.now === undefined) {
    (function () {
      var start = Date.now()

      window.performance.now = function () {
        return Date.now() - start
      }
    })()
  }
}