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1
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; |
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2
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/** |
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3
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* @fileoverview Polyfills for old browsers. |
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4
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* @see https://github.com/inexorabletash/polyfill/blob/master/es5.js |
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5
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* @see https://gist.github.com/jhermsmeier/9a34b06a107bbf5d2c91 |
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6
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*/ |
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7
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8
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// ES 15.2.3.6 Object.defineProperty ( O, P, Attributes ) |
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9
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// Partial support for most common case - getters, setters, and values |
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10
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(function() { |
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11
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if (!Object.defineProperty || |
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12
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!(function () { try { Object.defineProperty({}, 'x', {}); return true; } catch (e) { return false; } } ())) { |
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13
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var orig = Object.defineProperty; |
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14
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Object.defineProperty = function (o, prop, desc) { |
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15
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// In IE8 try built-in implementation for defining properties on DOM prototypes. |
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16
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if (orig) { try { return orig(o, prop, desc); } catch (e) {} } |
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17
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18
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if (o !== Object(o)) { throw TypeError("Object.defineProperty called on non-object"); } |
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if (Object.prototype.__defineGetter__ && ('get' in desc)) { |
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Object.prototype.__defineGetter__.call(o, prop, desc.get); |
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} |
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if (Object.prototype.__defineSetter__ && ('set' in desc)) { |
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Object.prototype.__defineSetter__.call(o, prop, desc.set); |
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} |
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25
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if ('value' in desc) { |
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o[prop] = desc.value; |
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} |
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return o; |
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}; |
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} |
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31
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}()); |
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33
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// On older versions of IE Object.getOwnPropertyDescriptor can only be |
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// called with DOM elements; Here it is tested against a non-DOM object. |
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35
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// If an error is raised, the method is replaced. |
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// by @rochars based on https://gist.github.com/jhermsmeier/9a34b06a107bbf5d2c91 |
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37
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var testObject = {"t":"o"}; |
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var replaceGetOwnPropertyDescriptor = false; |
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try { |
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40
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Object.getOwnPropertyDescriptor(testObject, "t"); |
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} catch(err) { |
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replaceGetOwnPropertyDescriptor = true; |
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} |
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44
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if (replaceGetOwnPropertyDescriptor) { |
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Object.getOwnPropertyDescriptor = function( object, key ) { |
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46
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47
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var hasSupport = |
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48
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typeof object.__lookupGetter__ === 'function' && |
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typeof object.__lookupSetter__ === 'function' |
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51
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// TODO: How does one determine this?! |
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var isGetterSetter = !hasSupport ? null : |
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object.__lookupGetter__( key ) || |
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54
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object.__lookupSetter__( key ) |
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55
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56
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return isGetterSetter != null ? { |
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57
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configurable: true, |
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enumerable: true, |
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59
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get: object.__lookupGetter__( key ), |
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60
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set: object.__lookupSetter__( key ) |
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} : { |
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configurable: true, |
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writable: true, |
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64
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enumerable: true, |
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value: object[ key ] |
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66
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} |
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67
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} |
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68
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} |
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69
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rochars /
minibuffer
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