| // These polyfills taken from MDN (developer.mozilla.org) |
| |
| // From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys |
| if (!Object.keys) { |
| Object.keys = (function() { |
| 'use strict'; |
| var hasOwnProperty = Object.prototype.hasOwnProperty, |
| hasDontEnumBug = !({ toString: null }).propertyIsEnumerable('toString'), |
| dontEnums = [ |
| 'toString', |
| 'toLocaleString', |
| 'valueOf', |
| 'hasOwnProperty', |
| 'isPrototypeOf', |
| 'propertyIsEnumerable', |
| 'constructor' |
| ], |
| dontEnumsLength = dontEnums.length; |
| |
| return function(obj) { |
| if (typeof obj !== 'object' && (typeof obj !== 'function' || obj === null)) { |
| throw new TypeError('Object.keys called on non-object'); |
| } |
| |
| var result = [], prop, i; |
| |
| for (prop in obj) { |
| if (hasOwnProperty.call(obj, prop)) { |
| result.push(prop); |
| } |
| } |
| |
| if (hasDontEnumBug) { |
| for (i = 0; i < dontEnumsLength; i++) { |
| if (hasOwnProperty.call(obj, dontEnums[i])) { |
| result.push(dontEnums[i]); |
| } |
| } |
| } |
| return result; |
| }; |
| }()); |
| } |
| |
| // Production steps of ECMA-262, Edition 5, 15.4.4.18 |
| // Reference: http://es5.github.io/#x15.4.4.18 |
| if (!Array.prototype.forEach) { |
| |
| Array.prototype.forEach = function(callback, thisArg) { |
| |
| var T, k; |
| |
| if (this == null) { |
| throw new TypeError(' this is null or not defined'); |
| } |
| |
| // 1. Let O be the result of calling ToObject passing the |this| value as the argument. |
| var O = Object(this); |
| |
| // 2. Let lenValue be the result of calling the Get internal method of O with the argument "length". |
| // 3. Let len be ToUint32(lenValue). |
| var len = O.length >>> 0; |
| |
| // 4. If IsCallable(callback) is false, throw a TypeError exception. |
| // See: http://es5.github.com/#x9.11 |
| if (typeof callback !== "function") { |
| throw new TypeError(callback + ' is not a function'); |
| } |
| |
| // 5. If thisArg was supplied, let T be thisArg; else let T be undefined. |
| if (arguments.length > 1) { |
| T = thisArg; |
| } |
| |
| // 6. Let k be 0 |
| k = 0; |
| |
| // 7. Repeat, while k < len |
| while (k < len) { |
| |
| var kValue; |
| |
| // a. Let Pk be ToString(k). |
| // This is implicit for LHS operands of the in operator |
| // b. Let kPresent be the result of calling the HasProperty internal method of O with argument Pk. |
| // This step can be combined with c |
| // c. If kPresent is true, then |
| if (k in O) { |
| |
| // i. Let kValue be the result of calling the Get internal method of O with argument Pk. |
| kValue = O[k]; |
| |
| // ii. Call the Call internal method of callback with T as the this value and |
| // argument list containing kValue, k, and O. |
| callback.call(T, kValue, k, O); |
| } |
| // d. Increase k by 1. |
| k++; |
| } |
| // 8. return undefined |
| }; |
| } |
| |
| // Production steps of ECMA-262, Edition 5, 15.4.4.14 |
| // Reference: http://es5.github.io/#x15.4.4.14 |
| if (!Array.prototype.indexOf) { |
| Array.prototype.indexOf = function(searchElement, fromIndex) { |
| |
| var k; |
| |
| // 1. Let O be the result of calling ToObject passing |
| // the this value as the argument. |
| if (this == null) { |
| throw new TypeError('"this" is null or not defined'); |
| } |
| |
| var O = Object(this); |
| |
| // 2. Let lenValue be the result of calling the Get |
| // internal method of O with the argument "length". |
| // 3. Let len be ToUint32(lenValue). |
| var len = O.length >>> 0; |
| |
| // 4. If len is 0, return -1. |
| if (len === 0) { |
| return -1; |
| } |
| |
| // 5. If argument fromIndex was passed let n be |
| // ToInteger(fromIndex); else let n be 0. |
| var n = +fromIndex || 0; |
| |
| if (Math.abs(n) === Infinity) { |
| n = 0; |
| } |
| |
| // 6. If n >= len, return -1. |
| if (n >= len) { |
| return -1; |
| } |
| |
| // 7. If n >= 0, then Let k be n. |
| // 8. Else, n<0, Let k be len - abs(n). |
| // If k is less than 0, then let k be 0. |
| k = Math.max(n >= 0 ? n : len - Math.abs(n), 0); |
| |
| // 9. Repeat, while k < len |
| while (k < len) { |
| // a. Let Pk be ToString(k). |
| // This is implicit for LHS operands of the in operator |
| // b. Let kPresent be the result of calling the |
| // HasProperty internal method of O with argument Pk. |
| // This step can be combined with c |
| // c. If kPresent is true, then |
| // i. Let elementK be the result of calling the Get |
| // internal method of O with the argument ToString(k). |
| // ii. Let same be the result of applying the |
| // Strict Equality Comparison Algorithm to |
| // searchElement and elementK. |
| // iii. If same is true, return k. |
| if (k in O && O[k] === searchElement) { |
| return k; |
| } |
| k++; |
| } |
| return -1; |
| }; |
| } |