1 /* The contents of this file are subject to the Netscape Public 2 * License Version 1.1 (the "License"); you may not use this file 3 * except in compliance with the License. You may obtain a copy of 4 * the License at http://www.mozilla.org/NPL/ 5 * 6 * Software distributed under the License is distributed on an "AS 7 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or 8 * implied. See the License for the specific language governing 9 * rights and limitations under the License. 10 * 11 * The Original Code is Mozilla Communicator client code, released March 12 * 31, 1998. 13 * 14 * The Initial Developer of the Original Code is Netscape Communications 15 * Corporation. Portions created by Netscape are 16 * Copyright (C) 1998 Netscape Communications Corporation. All 17 * Rights Reserved. 18 * 19 * Contributor(s): 20 * 21 */ 22 /** 23 File Name: 10.1.4-9.js 24 ECMA Section: 10.1.4 Scope Chain and Identifier Resolution 25 Description: 26 Every execution context has associated with it a scope chain. This is 27 logically a list of objects that are searched when binding an Identifier. 28 When control enters an execution context, the scope chain is created and 29 is populated with an initial set of objects, depending on the type of 30 code. When control leaves the execution context, the scope chain is 31 destroyed. 32 33 During execution, the scope chain of the execution context is affected 34 only by WithStatement. When execution enters a with block, the object 35 specified in the with statement is added to the front of the scope chain. 36 When execution leaves a with block, whether normally or via a break or 37 continue statement, the object is removed from the scope chain. The object 38 being removed will always be the first object in the scope chain. 39 40 During execution, the syntactic production PrimaryExpression : Identifier 41 is evaluated using the following algorithm: 42 43 1. Get the next object in the scope chain. If there isn't one, go to step 5. 44 2. Call the [[HasProperty]] method of Result(l), passing the Identifier as 45 the property. 46 3. If Result(2) is true, return a value of type Reference whose base object 47 is Result(l) and whose property name is the Identifier. 48 4. Go to step 1. 49 5. Return a value of type Reference whose base object is null and whose 50 property name is the Identifier. 51 The result of binding an identifier is always a value of type Reference with 52 its member name component equal to the identifier string. 53 Author: christine (at) netscape.com 54 Date: 12 november 1997 55 */ 56 var SECTION = "10.1.4-9"; 57 var VERSION = "ECMA_2"; 58 startTest(); 59 60 var testcases = getTestCases(); 61 62 writeHeaderToLog( SECTION + " Scope Chain and Identifier Resolution"); 63 test(); 64 65 function test() { 66 for ( tc=0; tc < testcases.length; tc++ ) { 67 68 var MYOBJECT = new MyObject(); 69 var RESULT = "hello"; 70 71 with ( MYOBJECT ) { 72 NEW_PROPERTY = RESULT; 73 } 74 testcases[tc].actual = NEW_PROPERTY; 75 testcases[tc].expect = RESULT; 76 77 testcases[tc].passed = writeTestCaseResult( 78 testcases[tc].expect, 79 testcases[tc].actual, 80 testcases[tc].description +" = "+ 81 testcases[tc].actual ); 82 83 testcases[tc].reason += ( testcases[tc].passed ) ? "" : "wrong value "; 84 } 85 stopTest(); 86 return ( testcases ); 87 } 88 function getTestCases() { 89 var array = new Array(); 90 var item = 0; 91 92 array[item++] = new TestCase( SECTION, "NEW_PROPERTY = " ); 93 94 return ( array ); 95 } 96 function MyObject( n ) { 97 this.__proto__ = Number.prototype; 98 } 99