JezK
Edit File: get-own-property-descriptor.js
// Copyright 2010 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // This file only tests very simple descriptors that always have // configurable, enumerable, and writable set to true. // A range of more elaborate tests are performed in // object-define-property.js function get() { return x; } function set(x) { this.x = x; } var obj = {x: 1}; obj.__defineGetter__("accessor", get); obj.__defineSetter__("accessor", set); var a = new Array(); a[1] = 42; obj[1] = 42; var descIsData = Object.getOwnPropertyDescriptor(obj, 'x'); assertTrue(descIsData.enumerable); assertTrue(descIsData.writable); assertTrue(descIsData.configurable); var descIsAccessor = Object.getOwnPropertyDescriptor(obj, 'accessor'); assertTrue(descIsAccessor.enumerable); assertTrue(descIsAccessor.configurable); assertTrue(descIsAccessor.get == get); assertTrue(descIsAccessor.set == set); var descIsNotData = Object.getOwnPropertyDescriptor(obj, 'not-x'); assertTrue(descIsNotData == undefined); var descIsNotAccessor = Object.getOwnPropertyDescriptor(obj, 'not-accessor'); assertTrue(descIsNotAccessor == undefined); var descArray = Object.getOwnPropertyDescriptor(a, '1'); assertTrue(descArray.enumerable); assertTrue(descArray.configurable); assertTrue(descArray.writable); assertEquals(descArray.value, 42); var descObjectElement = Object.getOwnPropertyDescriptor(obj, '1'); assertTrue(descObjectElement.enumerable); assertTrue(descObjectElement.configurable); assertTrue(descObjectElement.writable); assertEquals(descObjectElement.value, 42); // String objects. var a = new String('foobar'); for (var i = 0; i < a.length; i++) { var descStringObject = Object.getOwnPropertyDescriptor(a, i); assertTrue(descStringObject.enumerable); assertFalse(descStringObject.configurable); assertFalse(descStringObject.writable); assertEquals(descStringObject.value, a.substring(i, i+1)); } // Support for additional attributes on string objects. a.x = 42; a[10] = 'foo'; var descStringProperty = Object.getOwnPropertyDescriptor(a, 'x'); assertTrue(descStringProperty.enumerable); assertTrue(descStringProperty.configurable); assertTrue(descStringProperty.writable); assertEquals(descStringProperty.value, 42); var descStringElement = Object.getOwnPropertyDescriptor(a, '10'); assertTrue(descStringElement.enumerable); assertTrue(descStringElement.configurable); assertTrue(descStringElement.writable); assertEquals(descStringElement.value, 'foo'); // Test that elements in the prototype chain is not returned. var proto = {}; proto[10] = 42; var objWithProto = new Array(); objWithProto.prototype = proto; objWithProto[0] = 'bar'; var descWithProto = Object.getOwnPropertyDescriptor(objWithProto, '10'); assertEquals(undefined, descWithProto); // Test elements on global proxy object. var global = (function() { return this; })(); global[42] = 42; function el_getter() { return 239; }; function el_setter() {}; Object.defineProperty(global, '239', {get: el_getter, set: el_setter}); var descRegularElement = Object.getOwnPropertyDescriptor(global, '42'); assertEquals(42, descRegularElement.value); var descAccessorElement = Object.getOwnPropertyDescriptor(global, '239'); assertEquals(el_getter, descAccessorElement.get); assertEquals(el_setter, descAccessorElement.set);