зеркало из https://github.com/mozilla/gecko-dev.git
149 строки
5.5 KiB
JavaScript
149 строки
5.5 KiB
JavaScript
/* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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* License for the specific language governing rights and limitations
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* under the License.
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*
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* The Original Code is Mozilla Communicator client code, released March
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* 31, 1998.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are Copyright (C) 1998
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* Netscape Communications Corporation. All Rights Reserved.
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*
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*/
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/**
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File Name: 12.10-1.js
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ECMA Section: 12.10 The with statement
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Description:
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WithStatement :
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with ( Expression ) Statement
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The with statement adds a computed object to the front of the scope chain
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of the current execution context, then executes a statement with this
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augmented scope chain, then restores the scope chain.
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Semantics
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The production WithStatement : with ( Expression ) Statement is evaluated
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as follows:
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1. Evaluate Expression.
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2. Call GetValue(Result(1)).
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3. Call ToObject(Result(2)).
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4. Add Result(3) to the front of the scope chain.
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5. Evaluate Statement using the augmented scope chain from step 4.
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6. Remove Result(3) from the front of the scope chain.
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7. Return Result(5).
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Discussion
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Note that no matter how control leaves the embedded Statement, whether
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normally or by some form of abrupt completion, the scope chain is always
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restored to its former state.
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Author: christine@netscape.com
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Date: 12 november 1997
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*/
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var SECTION = "12.10-1";
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var VERSION = "ECMA_1";
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startTest();
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var TITLE = "The with statment";
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writeHeaderToLog( SECTION + " "+ TITLE);
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var testcases = getTestCases();
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test();
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function test() {
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for ( tc=0; tc < testcases.length; tc++ ) {
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testcases[tc].passed = writeTestCaseResult(
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testcases[tc].expect,
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testcases[tc].actual,
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testcases[tc].description +" = "+
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testcases[tc].actual );
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testcases[tc].reason += ( testcases[tc].passed ) ? "" : "wrong value ";
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}
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stopTest();
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return ( testcases );
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}
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function getTestCases() {
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var array = new Array();
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var item = 0;
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// although the scope chain changes, the this value is immutable for a given
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// execution context.
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array[item++] = new TestCase( SECTION,
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"with( new Number() ) { this +'' }",
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"[object global]",
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eval("with( new Number() ) { this +'' }") );
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// the object's functions and properties should override those of the
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// global object.
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array[item++] = new TestCase(
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SECTION,
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"var MYOB = new WithObject(true); with (MYOB) { parseInt() }",
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true,
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eval("var MYOB = new WithObject(true); with (MYOB) { parseInt() }") );
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array[item++] = new TestCase(
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SECTION,
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"var MYOB = new WithObject(false); with (MYOB) { NaN }",
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false,
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eval("var MYOB = new WithObject(false); with (MYOB) { NaN }") );
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array[item++] = new TestCase(
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SECTION,
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"var MYOB = new WithObject(NaN); with (MYOB) { Infinity }",
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Number.NaN,
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eval("var MYOB = new WithObject(NaN); with (MYOB) { Infinity }") );
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array[item++] = new TestCase(
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SECTION,
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"var MYOB = new WithObject(false); with (MYOB) { }; Infinity",
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Number.POSITIVE_INFINITY,
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eval("var MYOB = new WithObject(false); with (MYOB) { }; Infinity") );
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array[item++] = new TestCase(
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SECTION,
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"var MYOB = new WithObject(0); with (MYOB) { delete Infinity; Infinity }",
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Number.POSITIVE_INFINITY,
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eval("var MYOB = new WithObject(0); with (MYOB) { delete Infinity; Infinity }") );
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// let us leave the with block via a break.
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array[item++] = new TestCase(
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SECTION,
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"var MYOB = new WithObject(0); while (true) { with (MYOB) { Infinity; break; } } Infinity",
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Number.POSITIVE_INFINITY,
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eval("var MYOB = new WithObject(0); while (true) { with (MYOB) { Infinity; break; } } Infinity") );
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return ( array );
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}
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function WithObject( value ) {
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this.prop1 = 1;
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this.prop2 = new Boolean(true);
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this.prop3 = "a string";
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this.value = value;
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// now we will override global functions
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this.parseInt = new Function( "return this.value" );
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this.NaN = value;
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this.Infinity = value;
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this.unescape = new Function( "return this.value" );
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this.escape = new Function( "return this.value" );
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this.eval = new Function( "return this.value" );
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this.parseFloat = new Function( "return this.value" );
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this.isNaN = new Function( "return this.value" );
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this.isFinite = new Function( "return this.value" );
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}
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