The Tor Browser / file comparison
comparison: js/src/tests/ecma/Statements/12.10-1.js
js/src/tests/ecma/Statements/12.10-1.js
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
equal
deleted
inserted
replaced
| -1:000000000000 | 0:f33530df112a |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 | |
| 7 /** | |
| 8 File Name: 12.10-1.js | |
| 9 ECMA Section: 12.10 The with statement | |
| 10 Description: | |
| 11 WithStatement : | |
| 12 with ( Expression ) Statement | |
| 13 | |
| 14 The with statement adds a computed object to the front of the scope chain | |
| 15 of the current execution context, then executes a statement with this | |
| 16 augmented scope chain, then restores the scope chain. | |
| 17 | |
| 18 Semantics | |
| 19 | |
| 20 The production WithStatement : with ( Expression ) Statement is evaluated | |
| 21 as follows: | |
| 22 1. Evaluate Expression. | |
| 23 2. Call GetValue(Result(1)). | |
| 24 3. Call ToObject(Result(2)). | |
| 25 4. Add Result(3) to the front of the scope chain. | |
| 26 5. Evaluate Statement using the augmented scope chain from step 4. | |
| 27 6. Remove Result(3) from the front of the scope chain. | |
| 28 7. Return Result(5). | |
| 29 | |
| 30 Discussion | |
| 31 Note that no matter how control leaves the embedded Statement, whether | |
| 32 normally or by some form of abrupt completion, the scope chain is always | |
| 33 restored to its former state. | |
| 34 | |
| 35 Author: christine@netscape.com | |
| 36 Date: 12 november 1997 | |
| 37 */ | |
| 38 | |
| 39 var SECTION = "12.10-1"; | |
| 40 var VERSION = "ECMA_1"; | |
| 41 startTest(); | |
| 42 var TITLE = "The with statement"; | |
| 43 | |
| 44 writeHeaderToLog( SECTION + " "+ TITLE); | |
| 45 | |
| 46 | |
| 47 // although the scope chain changes, the this value is immutable for a given | |
| 48 // execution context. | |
| 49 | |
| 50 new TestCase( SECTION, | |
| 51 "with( new Number() ) { this +'' }", | |
| 52 GLOBAL, | |
| 53 eval("with( new Number() ) { this +'' }") ); | |
| 54 | |
| 55 // the object's functions and properties should override those of the | |
| 56 // global object. | |
| 57 | |
| 58 new TestCase( | |
| 59 SECTION, | |
| 60 "var MYOB = new WithObject(true); with (MYOB) { parseInt() }", | |
| 61 true, | |
| 62 eval("var MYOB = new WithObject(true); with (MYOB) { parseInt() }") ); | |
| 63 | |
| 64 new TestCase( | |
| 65 SECTION, | |
| 66 "var MYOB = new WithObject(false); with (MYOB) { NaN }", | |
| 67 false, | |
| 68 eval("var MYOB = new WithObject(false); with (MYOB) { NaN }") ); | |
| 69 | |
| 70 new TestCase( | |
| 71 SECTION, | |
| 72 "var MYOB = new WithObject(NaN); with (MYOB) { Infinity }", | |
| 73 Number.NaN, | |
| 74 eval("var MYOB = new WithObject(NaN); with (MYOB) { Infinity }") ); | |
| 75 | |
| 76 new TestCase( | |
| 77 SECTION, | |
| 78 "var MYOB = new WithObject(false); with (MYOB) { }; Infinity", | |
| 79 Number.POSITIVE_INFINITY, | |
| 80 eval("var MYOB = new WithObject(false); with (MYOB) { }; Infinity") ); | |
| 81 | |
| 82 | |
| 83 new TestCase( | |
| 84 SECTION, | |
| 85 "var MYOB = new WithObject(0); with (MYOB) { delete Infinity; Infinity }", | |
| 86 Number.POSITIVE_INFINITY, | |
| 87 eval("var MYOB = new WithObject(0); with (MYOB) { delete Infinity; Infinity }") ); | |
| 88 | |
| 89 // let us leave the with block via a break. | |
| 90 | |
| 91 new TestCase( | |
| 92 SECTION, | |
| 93 "var MYOB = new WithObject(0); while (true) { with (MYOB) { Infinity; break; } } Infinity", | |
| 94 Number.POSITIVE_INFINITY, | |
| 95 eval("var MYOB = new WithObject(0); while (true) { with (MYOB) { Infinity; break; } } Infinity") ); | |
| 96 | |
| 97 | |
| 98 test(); | |
| 99 | |
| 100 function WithObject( value ) { | |
| 101 this.prop1 = 1; | |
| 102 this.prop2 = new Boolean(true); | |
| 103 this.prop3 = "a string"; | |
| 104 this.value = value; | |
| 105 | |
| 106 // now we will override global functions | |
| 107 | |
| 108 this.parseInt = new Function( "return this.value" ); | |
| 109 this.NaN = value; | |
| 110 this.Infinity = value; | |
| 111 this.unescape = new Function( "return this.value" ); | |
| 112 this.escape = new Function( "return this.value" ); | |
| 113 this.eval = new Function( "return this.value" ); | |
| 114 this.parseFloat = new Function( "return this.value" ); | |
| 115 this.isNaN = new Function( "return this.value" ); | |
| 116 this.isFinite = new Function( "return this.value" ); | |
| 117 } |
