es5-shim
Version:
ECMAScript 5 compatibility shims for legacy JavaScript engines
1,246 lines (1,135 loc) • 95.4 kB
JavaScript
/*!
* https://github.com/es-shims/es5-shim
* @license es5-shim Copyright 2009-2020 by contributors, MIT License
* see https://github.com/es-shims/es5-shim/blob/master/LICENSE
*/
// vim: ts=4 sts=4 sw=4 expandtab
// Add semicolon to prevent IIFE from being passed as argument to concatenated code.
; // eslint-disable-line no-extra-semi
// UMD (Universal Module Definition)
// see https://github.com/umdjs/umd/blob/master/templates/returnExports.js
(function (root, factory) {
'use strict';
/* global define */
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(factory);
} else if (typeof exports === 'object') {
// Node. Does not work with strict CommonJS, but
// only CommonJS-like enviroments that support module.exports,
// like Node.
module.exports = factory();
} else {
// Browser globals (root is window)
root.returnExports = factory(); // eslint-disable-line no-param-reassign
}
}(this, function () {
/**
* Brings an environment as close to ECMAScript 5 compliance
* as is possible with the facilities of erstwhile engines.
*
* Annotated ES5: https://es5.github.io/ (specific links below)
* ES5 Spec: https://www.ecma-international.org/wp-content/uploads/ECMA-262_5.1_edition_june_2011.pdf
* Required reading: https://javascriptweblog.wordpress.com/2011/12/05/extending-javascript-natives/
*/
// Shortcut to an often accessed properties, in order to avoid multiple
// dereference that costs universally. This also holds a reference to known-good
// functions.
var $Array = Array;
var ArrayPrototype = $Array.prototype;
var $Object = Object;
var ObjectPrototype = $Object.prototype;
var $Function = Function;
var FunctionPrototype = $Function.prototype;
var $String = String;
var StringPrototype = $String.prototype;
var $Number = Number;
var NumberPrototype = $Number.prototype;
var array_slice = ArrayPrototype.slice;
var array_splice = ArrayPrototype.splice;
var array_push = ArrayPrototype.push;
var array_unshift = ArrayPrototype.unshift;
var array_concat = ArrayPrototype.concat;
var array_join = ArrayPrototype.join;
var call = FunctionPrototype.call;
var apply = FunctionPrototype.apply;
var max = Math.max;
var min = Math.min;
var floor = Math.floor;
var abs = Math.abs;
var pow = Math.pow;
var round = Math.round;
var log = Math.log;
var LOG10E = Math.LOG10E;
var log10 = Math.log10 || function log10(value) {
return log(value) * LOG10E;
};
// Having a toString local variable name breaks in Opera so use to_string.
var to_string = ObjectPrototype.toString;
/* eslint-disable one-var-declaration-per-line, no-redeclare, max-statements-per-line */
var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
var isCallable; /* inlined from https://npmjs.com/is-callable */ var fnToStr = Function.prototype.toString, constructorRegex = /^\s*class /, isES6ClassFn = function isES6ClassFn(value) { try { var fnStr = fnToStr.call(value); var singleStripped = fnStr.replace(/\/\/.*\n/g, ''); var multiStripped = singleStripped.replace(/\/\*[.\s\S]*\*\//g, ''); var spaceStripped = multiStripped.replace(/\n/mg, ' ').replace(/ {2}/g, ' '); return constructorRegex.test(spaceStripped); } catch (e) { return false; /* not a function */ } }, tryFunctionObject = function tryFunctionObject(value) { try { if (isES6ClassFn(value)) { return false; } fnToStr.call(value); return true; } catch (e) { return false; } }, fnClass = '[object Function]', genClass = '[object GeneratorFunction]', isCallable = function isCallable(value) { if (!value) { return false; } if (typeof value !== 'function' && typeof value !== 'object') { return false; } if (hasToStringTag) { return tryFunctionObject(value); } if (isES6ClassFn(value)) { return false; } var strClass = to_string.call(value); return strClass === fnClass || strClass === genClass; };
var isRegex; /* inlined from https://npmjs.com/is-regex */ var regexExec = RegExp.prototype.exec, tryRegexExec = function tryRegexExec(value) { try { regexExec.call(value); return true; } catch (e) { return false; } }, regexClass = '[object RegExp]'; isRegex = function isRegex(value) { if (typeof value !== 'object') { return false; } return hasToStringTag ? tryRegexExec(value) : to_string.call(value) === regexClass; };
var isString; /* inlined from https://npmjs.com/is-string */ var strValue = String.prototype.valueOf, tryStringObject = function tryStringObject(value) { try { strValue.call(value); return true; } catch (e) { return false; } }, stringClass = '[object String]'; isString = function isString(value) { if (typeof value === 'string') { return true; } if (typeof value !== 'object') { return false; } return hasToStringTag ? tryStringObject(value) : to_string.call(value) === stringClass; };
/* eslint-enable one-var-declaration-per-line, no-redeclare, max-statements-per-line */
/* inlined from https://npmjs.com/define-properties */
var supportsDescriptors = $Object.defineProperty && (function () {
try {
var obj = {};
$Object.defineProperty(obj, 'x', { enumerable: false, value: obj });
// eslint-disable-next-line no-unreachable-loop, max-statements-per-line
for (var _ in obj) { return false; } // jscs:ignore disallowUnusedVariables
return obj.x === obj;
} catch (e) { /* this is ES3 */
return false;
}
}());
var defineProperties = (function (has) {
// Define configurable, writable, and non-enumerable props
// if they don't exist.
var defineProperty;
if (supportsDescriptors) {
defineProperty = function (object, name, method, forceAssign) {
if (!forceAssign && (name in object)) {
return;
}
$Object.defineProperty(object, name, {
configurable: true,
enumerable: false,
writable: true,
value: method
});
};
} else {
defineProperty = function (object, name, method, forceAssign) {
if (!forceAssign && (name in object)) {
return;
}
object[name] = method; // eslint-disable-line no-param-reassign
};
}
return function defineProperties(object, map, forceAssign) {
for (var name in map) {
if (has.call(map, name)) {
defineProperty(object, name, map[name], forceAssign);
}
}
};
}(ObjectPrototype.hasOwnProperty));
// this is needed in Chrome 15 (probably earlier) - 36
// https://bugs.chromium.org/p/v8/issues/detail?id=3334
if ($Object.defineProperty && supportsDescriptors) {
var F = function () {};
var toStringSentinel = {};
var sentinel = { toString: toStringSentinel };
$Object.defineProperty(F, 'prototype', { value: sentinel, writable: false });
if ((new F()).toString !== toStringSentinel) {
var $dP = $Object.defineProperty;
var $gOPD = $Object.getOwnPropertyDescriptor;
defineProperties($Object, {
defineProperty: function defineProperty(o, k, d) {
var key = $String(k);
if (typeof o === 'function' && key === 'prototype') {
var desc = $gOPD(o, key);
if (desc.writable && !d.writable && 'value' in d) {
try {
o[key] = d.value; // eslint-disable-line no-param-reassign
} catch (e) { /**/ }
}
return $dP(o, key, {
configurable: 'configurable' in d ? d.configurable : desc.configurable,
enumerable: 'enumerable' in d ? d.enumerable : desc.enumerable,
writable: d.writable
});
}
return $dP(o, key, d);
}
}, true);
}
}
//
// Util
// ======
//
/* replaceable with https://npmjs.com/package/es-abstract /helpers/isPrimitive */
var isPrimitive = function isPrimitive(input) {
var type = typeof input;
return input === null || (type !== 'object' && type !== 'function');
};
var isActualNaN = $Number.isNaN || function isActualNaN(x) {
return x !== x;
};
var ES = {
// ES5 9.4
// https://es5.github.io/#x9.4
// http://jsperf.com/to-integer
/* replaceable with https://npmjs.com/package/es-abstract ES5.ToInteger */
ToInteger: function ToInteger(num) {
var n = +num;
if (isActualNaN(n)) {
n = 0;
} else if (n !== 0 && n !== (1 / 0) && n !== -(1 / 0)) {
n = (n > 0 || -1) * floor(abs(n));
}
return n;
},
/* replaceable with https://npmjs.com/package/es-abstract ES5.ToPrimitive */
ToPrimitive: function ToPrimitive(input) {
var val, valueOf, toStr;
if (isPrimitive(input)) {
return input;
}
valueOf = input.valueOf;
if (isCallable(valueOf)) {
val = valueOf.call(input);
if (isPrimitive(val)) {
return val;
}
}
toStr = input.toString;
if (isCallable(toStr)) {
val = toStr.call(input);
if (isPrimitive(val)) {
return val;
}
}
throw new TypeError();
},
// ES5 9.9
// https://es5.github.io/#x9.9
/* replaceable with https://npmjs.com/package/es-abstract ES5.ToObject */
ToObject: function (o) {
if (o == null) { // this matches both null and undefined
throw new TypeError("can't convert " + o + ' to object');
}
return $Object(o);
},
/* replaceable with https://npmjs.com/package/es-abstract ES5.ToUint32 */
ToUint32: function ToUint32(x) {
return x >>> 0;
}
};
//
// Function
// ========
//
// ES-5 15.3.4.5
// https://es5.github.io/#x15.3.4.5
var Empty = function Empty() {};
defineProperties(FunctionPrototype, {
bind: function bind(that) { // .length is 1
// 1. Let Target be the this value.
var target = this;
// 2. If IsCallable(Target) is false, throw a TypeError exception.
if (!isCallable(target)) {
throw new TypeError('Function.prototype.bind called on incompatible ' + target);
}
// 3. Let A be a new (possibly empty) internal list of all of the
// argument values provided after thisArg (arg1, arg2 etc), in order.
// XXX slicedArgs will stand in for "A" if used
var args = array_slice.call(arguments, 1); // for normal call
// 4. Let F be a new native ECMAScript object.
// 11. Set the [[Prototype]] internal property of F to the standard
// built-in Function prototype object as specified in 15.3.3.1.
// 12. Set the [[Call]] internal property of F as described in
// 15.3.4.5.1.
// 13. Set the [[Construct]] internal property of F as described in
// 15.3.4.5.2.
// 14. Set the [[HasInstance]] internal property of F as described in
// 15.3.4.5.3.
var bound;
var binder = function () {
if (this instanceof bound) {
// 15.3.4.5.2 [[Construct]]
// When the [[Construct]] internal method of a function object,
// F that was created using the bind function is called with a
// list of arguments ExtraArgs, the following steps are taken:
// 1. Let target be the value of F's [[TargetFunction]]
// internal property.
// 2. If target has no [[Construct]] internal method, a
// TypeError exception is thrown.
// 3. Let boundArgs be the value of F's [[BoundArgs]] internal
// property.
// 4. Let args be a new list containing the same values as the
// list boundArgs in the same order followed by the same
// values as the list ExtraArgs in the same order.
// 5. Return the result of calling the [[Construct]] internal
// method of target providing args as the arguments.
var result = apply.call(
target,
this,
array_concat.call(args, array_slice.call(arguments))
);
if ($Object(result) === result) {
return result;
}
return this;
}
// 15.3.4.5.1 [[Call]]
// When the [[Call]] internal method of a function object, F,
// which was created using the bind function is called with a
// this value and a list of arguments ExtraArgs, the following
// steps are taken:
// 1. Let boundArgs be the value of F's [[BoundArgs]] internal
// property.
// 2. Let boundThis be the value of F's [[BoundThis]] internal
// property.
// 3. Let target be the value of F's [[TargetFunction]] internal
// property.
// 4. Let args be a new list containing the same values as the
// list boundArgs in the same order followed by the same
// values as the list ExtraArgs in the same order.
// 5. Return the result of calling the [[Call]] internal method
// of target providing boundThis as the this value and
// providing args as the arguments.
// equiv: target.call(this, ...boundArgs, ...args)
return apply.call(
target,
that,
array_concat.call(args, array_slice.call(arguments))
);
};
// 15. If the [[Class]] internal property of Target is "Function", then
// a. Let L be the length property of Target minus the length of A.
// b. Set the length own property of F to either 0 or L, whichever is
// larger.
// 16. Else set the length own property of F to 0.
var boundLength = max(0, target.length - args.length);
// 17. Set the attributes of the length own property of F to the values
// specified in 15.3.5.1.
var boundArgs = [];
for (var i = 0; i < boundLength; i++) {
array_push.call(boundArgs, '$' + i);
}
// XXX Build a dynamic function with desired amount of arguments is the only
// way to set the length property of a function.
// In environments where Content Security Policies enabled (Chrome extensions,
// for ex.) all use of eval or Function costructor throws an exception.
// However in all of these environments Function.prototype.bind exists
// and so this code will never be executed.
bound = $Function('binder', 'return function (' + array_join.call(boundArgs, ',') + '){ return binder.apply(this, arguments); }')(binder);
if (target.prototype) {
Empty.prototype = target.prototype;
bound.prototype = new Empty();
// Clean up dangling references.
Empty.prototype = null;
}
// TODO
// 18. Set the [[Extensible]] internal property of F to true.
// TODO
// 19. Let thrower be the [[ThrowTypeError]] function Object (13.2.3).
// 20. Call the [[DefineOwnProperty]] internal method of F with
// arguments "caller", PropertyDescriptor {[[Get]]: thrower, [[Set]]:
// thrower, [[Enumerable]]: false, [[Configurable]]: false}, and
// false.
// 21. Call the [[DefineOwnProperty]] internal method of F with
// arguments "arguments", PropertyDescriptor {[[Get]]: thrower,
// [[Set]]: thrower, [[Enumerable]]: false, [[Configurable]]: false},
// and false.
// TODO
// NOTE Function objects created using Function.prototype.bind do not
// have a prototype property or the [[Code]], [[FormalParameters]], and
// [[Scope]] internal properties.
// XXX can't delete prototype in pure-js.
// 22. Return F.
return bound;
}
});
// _Please note: Shortcuts are defined after `Function.prototype.bind` as we
// use it in defining shortcuts.
var owns = call.bind(ObjectPrototype.hasOwnProperty);
var toStr = call.bind(ObjectPrototype.toString);
var arraySlice = call.bind(array_slice);
var arraySliceApply = apply.bind(array_slice);
/* globals document */
if (typeof document === 'object' && document && document.documentElement) {
try {
arraySlice(document.documentElement.childNodes);
} catch (e) {
var origArraySlice = arraySlice;
var origArraySliceApply = arraySliceApply;
arraySlice = function arraySliceIE(arr) {
var r = [];
var i = arr.length;
while (i-- > 0) {
r[i] = arr[i];
}
return origArraySliceApply(r, origArraySlice(arguments, 1));
};
arraySliceApply = function arraySliceApplyIE(arr, args) {
return origArraySliceApply(arraySlice(arr), args);
};
}
}
var strSlice = call.bind(StringPrototype.slice);
var strSplit = call.bind(StringPrototype.split);
var strIndexOf = call.bind(StringPrototype.indexOf);
var pushCall = call.bind(array_push);
var isEnum = call.bind(ObjectPrototype.propertyIsEnumerable);
var arraySort = call.bind(ArrayPrototype.sort);
//
// Array
// =====
//
var isArray = $Array.isArray || function isArray(obj) {
return toStr(obj) === '[object Array]';
};
// ES5 15.4.4.12
// https://es5.github.io/#x15.4.4.13
// Return len+argCount.
// [bugfix, ielt8]
// IE < 8 bug: [].unshift(0) === undefined but should be "1"
var hasUnshiftReturnValueBug = [].unshift(0) !== 1;
defineProperties(ArrayPrototype, {
unshift: function () {
array_unshift.apply(this, arguments);
return this.length;
}
}, hasUnshiftReturnValueBug);
// ES5 15.4.3.2
// https://es5.github.io/#x15.4.3.2
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/isArray
defineProperties($Array, { isArray: isArray });
// The IsCallable() check in the Array functions
// has been replaced with a strict check on the
// internal class of the object to trap cases where
// the provided function was actually a regular
// expression literal, which in V8 and
// JavaScriptCore is a typeof "function". Only in
// V8 are regular expression literals permitted as
// reduce parameters, so it is desirable in the
// general case for the shim to match the more
// strict and common behavior of rejecting regular
// expressions.
// ES5 15.4.4.18
// https://es5.github.io/#x15.4.4.18
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/array/forEach
// Check failure of by-index access of string characters (IE < 9)
// and failure of `0 in boxedString` (Rhino)
var boxedString = $Object('a');
var splitString = boxedString[0] !== 'a' || !(0 in boxedString);
var properlyBoxesContext = function properlyBoxed(method) {
// Check node 0.6.21 bug where third parameter is not boxed
var properlyBoxesNonStrict = true;
var properlyBoxesStrict = true;
var threwException = false;
if (method) {
try {
method.call('foo', function (_, __, context) {
if (typeof context !== 'object') {
properlyBoxesNonStrict = false;
}
});
method.call([1], function () {
'use strict';
properlyBoxesStrict = typeof this === 'string';
}, 'x');
} catch (e) {
threwException = true;
}
}
return !!method && !threwException && properlyBoxesNonStrict && properlyBoxesStrict;
};
defineProperties(ArrayPrototype, {
forEach: function forEach(callbackfn/*, thisArg*/) {
var object = ES.ToObject(this);
var self = splitString && isString(this) ? strSplit(this, '') : object;
var i = -1;
var length = ES.ToUint32(self.length);
var T;
if (arguments.length > 1) {
T = arguments[1];
}
// If no callback function or if callback is not a callable function
if (!isCallable(callbackfn)) {
throw new TypeError('Array.prototype.forEach callback must be a function');
}
while (++i < length) {
if (i in self) {
// Invoke the callback function with call, passing arguments:
// context, property value, property key, thisArg object
if (typeof T === 'undefined') {
callbackfn(self[i], i, object);
} else {
callbackfn.call(T, self[i], i, object);
}
}
}
}
}, !properlyBoxesContext(ArrayPrototype.forEach));
// ES5 15.4.4.19
// https://es5.github.io/#x15.4.4.19
// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/map
defineProperties(ArrayPrototype, {
map: function map(callbackfn/*, thisArg*/) {
var object = ES.ToObject(this);
var self = splitString && isString(this) ? strSplit(this, '') : object;
var length = ES.ToUint32(self.length);
var result = $Array(length);
var T;
if (arguments.length > 1) {
T = arguments[1];
}
// If no callback function or if callback is not a callable function
if (!isCallable(callbackfn)) {
throw new TypeError('Array.prototype.map callback must be a function');
}
for (var i = 0; i < length; i++) {
if (i in self) {
if (typeof T === 'undefined') {
result[i] = callbackfn(self[i], i, object);
} else {
result[i] = callbackfn.call(T, self[i], i, object);
}
}
}
return result;
}
}, !properlyBoxesContext(ArrayPrototype.map));
// ES5 15.4.4.20
// https://es5.github.io/#x15.4.4.20
// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/filter
defineProperties(ArrayPrototype, {
filter: function filter(callbackfn/*, thisArg*/) {
var object = ES.ToObject(this);
var self = splitString && isString(this) ? strSplit(this, '') : object;
var length = ES.ToUint32(self.length);
var result = [];
var value;
var T;
if (arguments.length > 1) {
T = arguments[1];
}
// If no callback function or if callback is not a callable function
if (!isCallable(callbackfn)) {
throw new TypeError('Array.prototype.filter callback must be a function');
}
for (var i = 0; i < length; i++) {
if (i in self) {
value = self[i];
if (typeof T === 'undefined' ? callbackfn(value, i, object) : callbackfn.call(T, value, i, object)) {
pushCall(result, value);
}
}
}
return result;
}
}, !properlyBoxesContext(ArrayPrototype.filter));
// ES5 15.4.4.16
// https://es5.github.io/#x15.4.4.16
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/every
defineProperties(ArrayPrototype, {
every: function every(callbackfn/*, thisArg*/) {
var object = ES.ToObject(this);
var self = splitString && isString(this) ? strSplit(this, '') : object;
var length = ES.ToUint32(self.length);
var T;
if (arguments.length > 1) {
T = arguments[1];
}
// If no callback function or if callback is not a callable function
if (!isCallable(callbackfn)) {
throw new TypeError('Array.prototype.every callback must be a function');
}
for (var i = 0; i < length; i++) {
if (i in self && !(typeof T === 'undefined' ? callbackfn(self[i], i, object) : callbackfn.call(T, self[i], i, object))) {
return false;
}
}
return true;
}
}, !properlyBoxesContext(ArrayPrototype.every));
// ES5 15.4.4.17
// https://es5.github.io/#x15.4.4.17
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/some
defineProperties(ArrayPrototype, {
some: function some(callbackfn/*, thisArg */) {
var object = ES.ToObject(this);
var self = splitString && isString(this) ? strSplit(this, '') : object;
var length = ES.ToUint32(self.length);
var T;
if (arguments.length > 1) {
T = arguments[1];
}
// If no callback function or if callback is not a callable function
if (!isCallable(callbackfn)) {
throw new TypeError('Array.prototype.some callback must be a function');
}
for (var i = 0; i < length; i++) {
if (i in self && (typeof T === 'undefined' ? callbackfn(self[i], i, object) : callbackfn.call(T, self[i], i, object))) {
return true;
}
}
return false;
}
}, !properlyBoxesContext(ArrayPrototype.some));
// ES5 15.4.4.21
// https://es5.github.io/#x15.4.4.21
// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/reduce
var reduceCoercesToObject = false;
if (ArrayPrototype.reduce) {
reduceCoercesToObject = typeof ArrayPrototype.reduce.call('es5', function (_, __, ___, list) {
return list;
}) === 'object';
}
defineProperties(ArrayPrototype, {
reduce: function reduce(callbackfn/*, initialValue*/) {
var object = ES.ToObject(this);
var self = splitString && isString(this) ? strSplit(this, '') : object;
var length = ES.ToUint32(self.length);
// If no callback function or if callback is not a callable function
if (!isCallable(callbackfn)) {
throw new TypeError('Array.prototype.reduce callback must be a function');
}
// no value to return if no initial value and an empty array
if (length === 0 && arguments.length === 1) {
throw new TypeError('reduce of empty array with no initial value');
}
var i = 0;
var result;
if (arguments.length >= 2) {
result = arguments[1];
} else {
do {
if (i in self) {
result = self[i++];
break;
}
// if array contains no values, no initial value to return
if (++i >= length) {
throw new TypeError('reduce of empty array with no initial value');
}
} while (true);
}
for (; i < length; i++) {
if (i in self) {
result = callbackfn(result, self[i], i, object);
}
}
return result;
}
}, !reduceCoercesToObject);
// ES5 15.4.4.22
// https://es5.github.io/#x15.4.4.22
// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/reduceRight
var reduceRightCoercesToObject = false;
if (ArrayPrototype.reduceRight) {
reduceRightCoercesToObject = typeof ArrayPrototype.reduceRight.call('es5', function (_, __, ___, list) {
return list;
}) === 'object';
}
defineProperties(ArrayPrototype, {
reduceRight: function reduceRight(callbackfn/*, initial*/) {
var object = ES.ToObject(this);
var self = splitString && isString(this) ? strSplit(this, '') : object;
var length = ES.ToUint32(self.length);
// If no callback function or if callback is not a callable function
if (!isCallable(callbackfn)) {
throw new TypeError('Array.prototype.reduceRight callback must be a function');
}
// no value to return if no initial value, empty array
if (length === 0 && arguments.length === 1) {
throw new TypeError('reduceRight of empty array with no initial value');
}
var result;
var i = length - 1;
if (arguments.length >= 2) {
result = arguments[1];
} else {
do {
if (i in self) {
result = self[i--];
break;
}
// if array contains no values, no initial value to return
if (--i < 0) {
throw new TypeError('reduceRight of empty array with no initial value');
}
} while (true);
}
if (i < 0) {
return result;
}
do {
if (i in self) {
result = callbackfn(result, self[i], i, object);
}
} while (i--);
return result;
}
}, !reduceRightCoercesToObject);
// ES5 15.4.4.14
// https://es5.github.io/#x15.4.4.14
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf
var hasFirefox2IndexOfBug = ArrayPrototype.indexOf && [0, 1].indexOf(1, 2) !== -1;
defineProperties(ArrayPrototype, {
indexOf: function indexOf(searchElement/*, fromIndex */) {
var self = splitString && isString(this) ? strSplit(this, '') : ES.ToObject(this);
var length = ES.ToUint32(self.length);
if (length === 0) {
return -1;
}
var i = 0;
if (arguments.length > 1) {
i = ES.ToInteger(arguments[1]);
}
// handle negative indices
i = i >= 0 ? i : max(0, length + i);
for (; i < length; i++) {
if (i in self && self[i] === searchElement) {
return i;
}
}
return -1;
}
}, hasFirefox2IndexOfBug);
// ES5 15.4.4.15
// https://es5.github.io/#x15.4.4.15
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/lastIndexOf
var hasFirefox2LastIndexOfBug = ArrayPrototype.lastIndexOf && [0, 1].lastIndexOf(0, -3) !== -1;
defineProperties(ArrayPrototype, {
lastIndexOf: function lastIndexOf(searchElement/*, fromIndex */) {
var self = splitString && isString(this) ? strSplit(this, '') : ES.ToObject(this);
var length = ES.ToUint32(self.length);
if (length === 0) {
return -1;
}
var i = length - 1;
if (arguments.length > 1) {
i = min(i, ES.ToInteger(arguments[1]));
}
// handle negative indices
i = i >= 0 ? i : length - abs(i);
for (; i >= 0; i--) {
if (i in self && searchElement === self[i]) {
return i;
}
}
return -1;
}
}, hasFirefox2LastIndexOfBug);
// ES5 15.4.4.12
// https://es5.github.io/#x15.4.4.12
var spliceNoopReturnsEmptyArray = (function () {
var a = [1, 2];
var result = a.splice();
return a.length === 2 && isArray(result) && result.length === 0;
}());
defineProperties(ArrayPrototype, {
// Safari 5.0 bug where .splice() returns undefined
splice: function splice(start, deleteCount) {
if (arguments.length === 0) {
return [];
}
return array_splice.apply(this, arguments);
}
}, !spliceNoopReturnsEmptyArray);
var spliceWorksWithEmptyObject = (function () {
var obj = {};
ArrayPrototype.splice.call(obj, 0, 0, 1);
return obj.length === 1;
}());
var hasES6Defaults = [0, 1, 2].splice(0).length === 3;
defineProperties(ArrayPrototype, {
splice: function splice(start, deleteCount) {
if (arguments.length === 0) {
return [];
}
var args = arguments;
this.length = max(ES.ToInteger(this.length), 0);
if (arguments.length > 0 && typeof deleteCount !== 'number') {
args = arraySlice(arguments);
if (args.length < 2) {
pushCall(args, this.length - start);
} else {
args[1] = ES.ToInteger(deleteCount);
}
}
return array_splice.apply(this, args);
}
}, !spliceWorksWithEmptyObject || !hasES6Defaults);
var spliceWorksWithLargeSparseArrays = (function () {
// Per https://github.com/es-shims/es5-shim/issues/295
// Safari 7/8 breaks with sparse arrays of size 1e5 or greater
var arr = new $Array(1e5);
// note: the index MUST be 8 or larger or the test will false pass
arr[8] = 'x';
arr.splice(1, 1);
// note: this test must be defined *after* the indexOf shim
// per https://github.com/es-shims/es5-shim/issues/313
return arr.indexOf('x') === 7;
}());
var spliceWorksWithSmallSparseArrays = (function () {
// Per https://github.com/es-shims/es5-shim/issues/295
// Opera 12.15 breaks on this, no idea why.
var n = 256;
var arr = [];
arr[n] = 'a';
arr.splice(n + 1, 0, 'b');
return arr[n] === 'a';
}());
defineProperties(ArrayPrototype, {
splice: function splice(start, deleteCount) {
var O = ES.ToObject(this);
var A = [];
var len = ES.ToUint32(O.length);
var relativeStart = ES.ToInteger(start);
var actualStart = relativeStart < 0 ? max((len + relativeStart), 0) : min(relativeStart, len);
var actualDeleteCount = arguments.length === 0
? 0
: arguments.length === 1
? len - actualStart
: min(max(ES.ToInteger(deleteCount), 0), len - actualStart);
var k = 0;
var from;
while (k < actualDeleteCount) {
from = $String(actualStart + k);
if (owns(O, from)) {
A[k] = O[from];
}
k += 1;
}
var items = arraySlice(arguments, 2);
var itemCount = items.length;
var to;
if (itemCount < actualDeleteCount) {
k = actualStart;
var maxK = len - actualDeleteCount;
while (k < maxK) {
from = $String(k + actualDeleteCount);
to = $String(k + itemCount);
if (owns(O, from)) {
O[to] = O[from];
} else {
delete O[to];
}
k += 1;
}
k = len;
var minK = len - actualDeleteCount + itemCount;
while (k > minK) {
delete O[k - 1];
k -= 1;
}
} else if (itemCount > actualDeleteCount) {
k = len - actualDeleteCount;
while (k > actualStart) {
from = $String(k + actualDeleteCount - 1);
to = $String(k + itemCount - 1);
if (owns(O, from)) {
O[to] = O[from];
} else {
delete O[to];
}
k -= 1;
}
}
k = actualStart;
for (var i = 0; i < items.length; ++i) {
O[k] = items[i];
k += 1;
}
O.length = len - actualDeleteCount + itemCount;
return A;
}
}, !spliceWorksWithLargeSparseArrays || !spliceWorksWithSmallSparseArrays);
var originalJoin = ArrayPrototype.join;
var hasStringJoinBug;
try {
hasStringJoinBug = Array.prototype.join.call('123', ',') !== '1,2,3';
} catch (e) {
hasStringJoinBug = true;
}
if (hasStringJoinBug) {
defineProperties(ArrayPrototype, {
join: function join(separator) {
var sep = typeof separator === 'undefined' ? ',' : separator;
return originalJoin.call(isString(this) ? strSplit(this, '') : this, sep);
}
}, hasStringJoinBug);
}
var hasJoinUndefinedBug = [1, 2].join(undefined) !== '1,2';
if (hasJoinUndefinedBug) {
defineProperties(ArrayPrototype, {
join: function join(separator) {
var sep = typeof separator === 'undefined' ? ',' : separator;
return originalJoin.call(this, sep);
}
}, hasJoinUndefinedBug);
}
var pushShim = function push(item) {
var O = ES.ToObject(this);
var n = ES.ToUint32(O.length);
var i = 0;
while (i < arguments.length) {
O[n + i] = arguments[i];
i += 1;
}
O.length = n + i;
return n + i;
};
var pushIsNotGeneric = (function () {
var obj = {};
var result = Array.prototype.push.call(obj, undefined);
return result !== 1 || obj.length !== 1 || typeof obj[0] !== 'undefined' || !owns(obj, 0);
}());
defineProperties(ArrayPrototype, {
push: function push(item) {
if (isArray(this)) {
return array_push.apply(this, arguments);
}
return pushShim.apply(this, arguments);
}
}, pushIsNotGeneric);
// This fixes a very weird bug in Opera 10.6 when pushing `undefined
var pushUndefinedIsWeird = (function () {
var arr = [];
var result = arr.push(undefined);
return result !== 1 || arr.length !== 1 || typeof arr[0] !== 'undefined' || !owns(arr, 0);
}());
defineProperties(ArrayPrototype, { push: pushShim }, pushUndefinedIsWeird);
// ES5 15.2.3.14
// https://es5.github.io/#x15.4.4.10
// Fix boxed string bug
defineProperties(ArrayPrototype, {
slice: function (start, end) {
var arr = isString(this) ? strSplit(this, '') : this;
return arraySliceApply(arr, arguments);
}
}, splitString);
var sortIgnoresNonFunctions = (function () {
try {
[1, 2].sort(null);
} catch (e) {
try {
[1, 2].sort({});
} catch (e2) {
return false;
}
}
return true;
}());
var sortThrowsOnRegex = (function () {
// this is a problem in Firefox 4, in which `typeof /a/ === 'function'`
try {
[1, 2].sort(/a/);
return false;
} catch (e) {}
return true;
}());
var sortIgnoresUndefined = (function () {
// applies in IE 8, for one.
try {
[1, 2].sort(undefined);
return true;
} catch (e) {}
return false;
}());
defineProperties(ArrayPrototype, {
sort: function sort(compareFn) {
if (typeof compareFn === 'undefined') {
return arraySort(this);
}
if (!isCallable(compareFn)) {
throw new TypeError('Array.prototype.sort callback must be a function');
}
return arraySort(this, compareFn);
}
}, sortIgnoresNonFunctions || !sortIgnoresUndefined || !sortThrowsOnRegex);
//
// Object
// ======
//
// ES5 15.2.3.14
// https://es5.github.io/#x15.2.3.14
// https://web.archive.org/web/20140727042234/http://whattheheadsaid.com/2010/10/a-safer-object-keys-compatibility-implementation
// eslint-disable-next-line quote-props
var hasDontEnumBug = !isEnum({ 'toString': null }, 'toString'); // jscs:ignore disallowQuotedKeysInObjects
var hasProtoEnumBug = isEnum(function () {}, 'prototype');
var hasStringEnumBug = !owns('x', '0');
var equalsConstructorPrototype = function (o) {
var ctor = o.constructor;
return ctor && ctor.prototype === o;
};
var excludedKeys = {
$applicationCache: true,
$console: true,
$external: true,
$frame: true,
$frameElement: true,
$frames: true,
$innerHeight: true,
$innerWidth: true,
$onmozfullscreenchange: true,
$onmozfullscreenerror: true,
$outerHeight: true,
$outerWidth: true,
$pageXOffset: true,
$pageYOffset: true,
$parent: true,
$scrollLeft: true,
$scrollTop: true,
$scrollX: true,
$scrollY: true,
$self: true,
$webkitIndexedDB: true,
$webkitStorageInfo: true,
$window: true,
$width: true,
$height: true,
$top: true,
$localStorage: true
};
var hasAutomationEqualityBug = (function () {
/* globals window */
if (typeof window === 'undefined') {
return false;
}
for (var k in window) {
try {
if (!excludedKeys['$' + k] && owns(window, k) && window[k] !== null && typeof window[k] === 'object') {
equalsConstructorPrototype(window[k]);
}
} catch (e) {
return true;
}
}
return false;
}());
var equalsConstructorPrototypeIfNotBuggy = function (object) {
if (typeof window === 'undefined' || !hasAutomationEqualityBug) {
return equalsConstructorPrototype(object);
}
try {
return equalsConstructorPrototype(object);
} catch (e) {
return false;
}
};
var dontEnums = [
'toString',
'toLocaleString',
'valueOf',
'hasOwnProperty',
'isPrototypeOf',
'propertyIsEnumerable',
'constructor'
];
var dontEnumsLength = dontEnums.length;
// taken directly from https://github.com/ljharb/is-arguments/blob/master/index.js
// can be replaced with require('is-arguments') if we ever use a build process instead
var isStandardArguments = function isArguments(value) {
return toStr(value) === '[object Arguments]';
};
var isLegacyArguments = function isArguments(value) {
return value !== null
&& typeof value === 'object'
&& typeof value.length === 'number'
&& value.length >= 0
&& !isArray(value)
&& isCallable(value.callee);
};
var isArguments = isStandardArguments(arguments) ? isStandardArguments : isLegacyArguments;
defineProperties($Object, {
keys: function keys(object) {
var isFn = isCallable(object);
var isArgs = isArguments(object);
var isObject = object !== null && typeof object === 'object';
var isStr = isObject && isString(object);
if (!isObject && !isFn && !isArgs) {
throw new TypeError('Object.keys called on a non-object');
}
var theKeys = [];
var skipProto = hasProtoEnumBug && isFn;
if ((isStr && hasStringEnumBug) || isArgs) {
for (var i = 0; i < object.length; ++i) {
pushCall(theKeys, $String(i));
}
}
if (!isArgs) {
for (var name in object) {
if (!(skipProto && name === 'prototype') && owns(object, name)) {
pushCall(theKeys, $String(name));
}
}
}
if (hasDontEnumBug) {
var skipConstructor = equalsConstructorPrototypeIfNotBuggy(object);
for (var j = 0; j < dontEnumsLength; j++) {
var dontEnum = dontEnums[j];
if (!(skipConstructor && dontEnum === 'constructor') && owns(object, dontEnum)) {
pushCall(theKeys, dontEnum);
}
}
}
return theKeys;
}
});
var keysWorksWithArguments = $Object.keys && (function () {
// Safari 5.0 bug
return $Object.keys(arguments).length === 2;
}(1, 2));
var keysHasArgumentsLengthBug = $Object.keys && (function () {
var argKeys = $Object.keys(arguments);
return arguments.length !== 1 || argKeys.length !== 1 || argKeys[0] !== 1;
}(1));
var originalKeys = $Object.keys;
defineProperties($Object, {
keys: function keys(object) {
if (isArguments(object)) {
return originalKeys(arraySlice(object));
}
return originalKeys(object);
}
}, !keysWorksWithArguments || keysHasArgumentsLengthBug);
//
// Date
// ====
//
var hasNegativeMonthYearBug = new Date(-3509827329600292).getUTCMonth() !== 0;
var aNegativeTestDate = new Date(-1509842289600292);
var aPositiveTestDate = new Date(1449662400000);
var hasToUTCStringFormatBug = aNegativeTestDate.toUTCString() !== 'Mon, 01 Jan -45875 11:59:59 GMT';
var hasToDateStringFormatBug;
var hasToStringFormatBug;
var timeZoneOffset = aNegativeTestDate.getTimezoneOffset();
if (timeZoneOffset < -720) {
hasToDateStringFormatBug = aNegativeTestDate.toDateString() !== 'Tue Jan 02 -45875';
hasToStringFormatBug = !(/^Thu Dec 10 2015 \d\d:\d\d:\d\d GMT[-+]\d\d\d\d(?: |$)/).test(String(aPositiveTestDate));
} else {
hasToDateStringFormatBug = aNegativeTestDate.toDateString() !== 'Mon Jan 01 -45875';
hasToStringFormatBug = !(/^Wed Dec 09 2015 \d\d:\d\d:\d\d GMT[-+]\d\d\d\d(?: |$)/).test(String(aPositiveTestDate));
}
var originalGetFullYear = call.bind(Date.prototype.getFullYear);
var originalGetMonth = call.bind(Date.prototype.getMonth);
var originalGetDate = call.bind(Date.prototype.getDate);
var originalGetUTCFullYear = call.bind(Date.prototype.getUTCFullYear);
var originalGetUTCMonth = call.bind(Date.prototype.getUTCMonth);
var originalGetUTCDate = call.bind(Date.prototype.getUTCDate);
var originalGetUTCDay = call.bind(Date.prototype.getUTCDay);
var originalGetUTCHours = call.bind(Date.prototype.getUTCHours);
var originalGetUTCMinutes = call.bind(Date.prototype.getUTCMinutes);
var originalGetUTCSeconds = call.bind(Date.prototype.getUTCSeconds);
var originalGetUTCMilliseconds = call.bind(Date.prototype.getUTCMilliseconds);
var dayName = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
var monthName = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
var daysInMonth = function daysInMonth(month, year) {
return originalGetDate(new Date(year, month, 0));
};
defineProperties(Date.prototype, {
getFullYear: function getFullYear() {
if (!this || !(this instanceof Date)) {
throw new TypeError('this is not a Date object.');
}
var year = originalGetFullYear(this);
if (year < 0 && originalGetMonth(this) > 11) {
return year + 1;
}
return year;
},
getMonth: function getMonth() {
if (!this || !(this instanceof Date)) {
throw new TypeError('this is not a Date object.');
}
var year = originalGetFullYear(this);
var month = originalGetMont