js/src/tests/ecma/Statements/12.10-1.js@6474c204b198
js/src/tests/ecma/Statements/12.10-1.js
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
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/. */
7 /**
8 File Name: 12.10-1.js
9 ECMA Section: 12.10 The with statement
10 Description:
11 WithStatement :
12 with ( Expression ) Statement
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.
18 Semantics
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).
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.
35 Author: christine@netscape.com
36 Date: 12 november 1997
37 */
39 var SECTION = "12.10-1";
40 var VERSION = "ECMA_1";
41 startTest();
42 var TITLE = "The with statement";
44 writeHeaderToLog( SECTION + " "+ TITLE);
47 // although the scope chain changes, the this value is immutable for a given
48 // execution context.
50 new TestCase( SECTION,
51 "with( new Number() ) { this +'' }",
52 GLOBAL,
53 eval("with( new Number() ) { this +'' }") );
55 // the object's functions and properties should override those of the
56 // global object.
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() }") );
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 }") );
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 }") );
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") );
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 }") );
89 // let us leave the with block via a break.
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") );
98 test();
100 function WithObject( value ) {
101 this.prop1 = 1;
102 this.prop2 = new Boolean(true);
103 this.prop3 = "a string";
104 this.value = value;
106 // now we will override global functions
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 }
