зеркало из https://github.com/mozilla/pjs.git
102 строки
3.8 KiB
JavaScript
102 строки
3.8 KiB
JavaScript
/* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations 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
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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*/
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/**
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File Name: 10.1.4-1.js
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ECMA Section: 10.1.4 Scope Chain and Identifier Resolution
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Description:
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Every execution context has associated with it a scope chain. This is
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logically a list of objects that are searched when binding an Identifier.
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When control enters an execution context, the scope chain is created and
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is populated with an initial set of objects, depending on the type of
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code. When control leaves the execution context, the scope chain is
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destroyed.
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During execution, the scope chain of the execution context is affected
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only by WithStatement. When execution enters a with block, the object
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specified in the with statement is added to the front of the scope chain.
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When execution leaves a with block, whether normally or via a break or
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continue statement, the object is removed from the scope chain. The object
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being removed will always be the first object in the scope chain.
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During execution, the syntactic production PrimaryExpression : Identifier
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is evaluated using the following algorithm:
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1. Get the next object in the scope chain. If there isn't one, go to step 5.
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2. Call the [[HasProperty]] method of Result(l), passing the Identifier as
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the property.
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3. If Result(2) is true, return a value of type Reference whose base object
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is Result(l) and whose property name is the Identifier.
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4. Go to step 1.
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5. Return a value of type Reference whose base object is null and whose
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property name is the Identifier.
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The result of binding an identifier is always a value of type Reference with
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its member name component equal to the identifier string.
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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 = "10.1.4-2";
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var VERSION = "ECMA_1";
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startTest();
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writeHeaderToLog( SECTION + " Scope Chain and Identifier Resolution");
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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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var MYOBJECT = new MyObject();
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var INPUT = 2;
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testcases[tc].description += "( "+INPUT +" )" ;
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with ( this ) {
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with ( MYOBJECT ) {
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testcases[tc].actual = eval( INPUT );
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testcases[tc].expect = Math.pow(INPUT,2);
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}
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}
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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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array[item++] = new TestCase( "SECTION", "with MyObject, eval should return square of " );
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return ( array );
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}
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function MyObject() {
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this.eval = new Function( "x", "return(Math.pow(Number(x),2))" );
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} |