64 lines
2.2 KiB
JavaScript
64 lines
2.2 KiB
JavaScript
;
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/**
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* @fileoverview Polyfills for old browsers.
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* @see https://github.com/inexorabletash/polyfill/blob/master/es5.js
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* @see https://gist.github.com/jhermsmeier/9a34b06a107bbf5d2c91
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*/
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// ES 15.2.3.6 Object.defineProperty ( O, P, Attributes )
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// Partial support for most common case - getters, setters, and values
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(function() {
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if (!Object.defineProperty ||
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!(function () { try { Object.defineProperty({}, 'x', {}); return true; } catch (e) { return false; } } ())) {
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var orig = Object.defineProperty;
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Object.defineProperty = function (o, prop, desc) {
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// In IE8 try built-in implementation for defining properties on DOM prototypes.
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if (orig) { try { return orig(o, prop, desc); } catch (e) {} }
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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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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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}());
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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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// If an error is raised, the method is replaced.
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// https://gist.github.com/jhermsmeier/9a34b06a107bbf5d2c91
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try {
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Object.getOwnPropertyDescriptor({"t":"o"}, "t");
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} catch(err) {
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Object.getOwnPropertyDescriptor = function( object, key ) {
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var hasSupport =
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typeof object.__lookupGetter__ === 'function' &&
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typeof object.__lookupSetter__ === 'function'
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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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object.__lookupSetter__( key )
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return isGetterSetter != null ? {
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configurable: true,
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enumerable: true,
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get: object.__lookupGetter__( key ),
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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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enumerable: true,
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value: object[ key ]
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}
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}
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}
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