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:          12.10-1.js
24    ECMA Section:       12.10 The with statement
25    Description:
26    WithStatement :
27    with ( Expression ) Statement
28
29    The with statement adds a computed object to the front of the scope chain
30    of the current execution context, then executes a statement with this
31    augmented scope chain, then restores the scope chain.
32
33    Semantics
34
35    The production WithStatement : with ( Expression ) Statement is evaluated
36    as follows:
37    1.  Evaluate Expression.
38    2.  Call GetValue(Result(1)).
39    3.  Call ToObject(Result(2)).
40    4.  Add Result(3) to the front of the scope chain.
41    5.  Evaluate Statement using the augmented scope chain from step 4.
42    6.  Remove Result(3) from the front of the scope chain.
43    7.  Return Result(5).
44
45    Discussion
46    Note that no matter how control leaves the embedded Statement, whether
47    normally or by some form of abrupt completion, the scope chain is always
48    restored to its former state.
49
50    Author:             christine@netscape.com
51    Date:               12 november 1997
52*/
53
54    var SECTION = "12.10-1";
55    var VERSION = "ECMA_1";
56    startTest();
57    var TITLE   = "The with statment";
58
59    writeHeaderToLog( SECTION + " "+ TITLE);
60
61    var testcases = getTestCases();
62
63    test();
64
65function test() {
66    for ( tc=0; tc < testcases.length; tc++ ) {
67        testcases[tc].passed = writeTestCaseResult(
68                            testcases[tc].expect,
69                            testcases[tc].actual,
70                            testcases[tc].description +" = "+
71                            testcases[tc].actual );
72
73        testcases[tc].reason += ( testcases[tc].passed ) ? "" : "wrong value ";
74    }
75    stopTest();
76    return ( testcases );
77}
78function getTestCases() {
79    var array = new Array();
80    var item = 0;
81
82    // although the scope chain changes, the this value is immutable for a given
83    // execution context.
84
85    array[item++] = new TestCase( SECTION,
86                                "with( new Number() ) { this +'' }",
87                                "[object global]",
88                                eval("with( new Number() ) { this +'' }") );
89
90    // the object's functions and properties should override those of the
91    // global object.
92
93    array[item++] = new TestCase(
94                        SECTION,
95                        "var MYOB = new WithObject(true); with (MYOB) { parseInt() }",
96                        true,
97                        eval("var MYOB = new WithObject(true); with (MYOB) { parseInt() }") );
98
99    array[item++] = new TestCase(
100                        SECTION,
101                        "var MYOB = new WithObject(false); with (MYOB) { NaN }",
102                        false,
103                        eval("var MYOB = new WithObject(false); with (MYOB) { NaN }") );
104
105    array[item++] = new TestCase(
106                        SECTION,
107                        "var MYOB = new WithObject(NaN); with (MYOB) { Infinity }",
108                        Number.NaN,
109                        eval("var MYOB = new WithObject(NaN); with (MYOB) { Infinity }") );
110
111    array[item++] = new TestCase(
112                        SECTION,
113                        "var MYOB = new WithObject(false); with (MYOB) { }; Infinity",
114                        Number.POSITIVE_INFINITY,
115                        eval("var MYOB = new WithObject(false); with (MYOB) { }; Infinity") );
116
117
118    array[item++] = new TestCase(
119                        SECTION,
120                        "var MYOB = new WithObject(0); with (MYOB) { delete Infinity; Infinity }",
121                        Number.POSITIVE_INFINITY,
122                        eval("var MYOB = new WithObject(0); with (MYOB) { delete Infinity; Infinity }") );
123
124    // let us leave the with block via a break.
125
126    array[item++] = new TestCase(
127                        SECTION,
128                        "var MYOB = new WithObject(0); while (true) { with (MYOB) { Infinity; break; } } Infinity",
129                        Number.POSITIVE_INFINITY,
130                        eval("var MYOB = new WithObject(0); while (true) { with (MYOB) { Infinity; break; } } Infinity") );
131
132    return ( array );
133}
134function WithObject( value ) {
135    this.prop1 = 1;
136    this.prop2 = new Boolean(true);
137    this.prop3 = "a string";
138    this.value = value;
139
140    // now we will override global functions
141
142    this.parseInt = new Function( "return this.value" );
143    this.NaN = value;
144    this.Infinity = value;
145    this.unescape = new Function( "return this.value" );
146    this.escape   = new Function( "return this.value" );
147    this.eval     = new Function( "return this.value" );
148    this.parseFloat = new Function( "return this.value" );
149    this.isNaN      = new Function( "return this.value" );
150    this.isFinite   = new Function( "return this.value" );
151}
152