michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: 
michael@0: /**
michael@0:    File Name:          11.6.2-1.js
michael@0:    ECMA Section:       11.6.2 The Subtraction operator ( - )
michael@0:    Description:
michael@0: 
michael@0:    The production AdditiveExpression : AdditiveExpression -
michael@0:    MultiplicativeExpression is evaluated as follows:
michael@0: 
michael@0:    1.  Evaluate AdditiveExpression.
michael@0:    2.  Call GetValue(Result(1)).
michael@0:    3.  Evaluate MultiplicativeExpression.
michael@0:    4.  Call GetValue(Result(3)).
michael@0:    5.  Call ToNumber(Result(2)).
michael@0:    6.  Call ToNumber(Result(4)).
michael@0:    7.  Apply the subtraction operation to Result(5) and Result(6). See the
michael@0:    discussion below (11.6.3).
michael@0:    8.  Return Result(7).
michael@0: 
michael@0:    Author:             christine@netscape.com
michael@0:    Date:               12 november 1997
michael@0: */
michael@0: var SECTION = "11.6.2-1";
michael@0: var VERSION = "ECMA_1";
michael@0: startTest();
michael@0: 
michael@0: writeHeaderToLog( SECTION + " The subtraction operator ( - )");
michael@0: 
michael@0: // tests "MyValuelessObject", where the value is
michael@0: // set in the object's prototype, not the object itself.
michael@0: 
michael@0: 
michael@0: new TestCase(   SECTION,
michael@0:                 "var EXP_1 = new MyValuelessObject(true); var EXP_2 = new MyValuelessObject(false); EXP_1 - EXP_2",
michael@0:                 1,
michael@0:                 eval("var EXP_1 = new MyValuelessObject(true); var EXP_2 = new MyValuelessObject(false); EXP_1 - EXP_2") );
michael@0: 
michael@0: new TestCase(   SECTION,
michael@0:                 "var EXP_1 = new MyValuelessObject(new Boolean(true)); var EXP_2 = new MyValuelessObject(new Boolean(false)); EXP_1 - EXP_2",
michael@0:                 Number.NaN,
michael@0:                 eval("var EXP_1 = new MyValuelessObject(new Boolean(true)); var EXP_2 = new MyValuelessObject(new Boolean(false)); EXP_1 - EXP_2") );
michael@0: 
michael@0: // tests "MyValuelessObject", where the value is
michael@0: // set in the object's prototype, not the object itself.
michael@0: 
michael@0: new TestCase(   SECTION,
michael@0:                 "var EXP_1 = new MyValuelessObject(100); var EXP_2 = new MyValuelessObject(1); EXP_1 - EXP_2",
michael@0:                 99,
michael@0:                 eval("var EXP_1 = new MyValuelessObject(100); var EXP_2 = new MyValuelessObject(1); EXP_1 - EXP_2") );
michael@0: /*
michael@0:   new TestCase(   SECTION,
michael@0:   "var EXP_1 = new MyValuelessObject(new Number(100)); var EXP_2 = new MyValuelessObject(new Number(1)); EXP_1 - EXP_2",
michael@0:   Number.NaN,
michael@0:   eval("var EXP_1 = new MyValuelessObject(new Number(100)); var EXP_2 = new MyValuelessObject(new Number(1)); EXP_1 - EXP_2") );
michael@0: */
michael@0: // same thing with string!
michael@0: 
michael@0: test();
michael@0: 
michael@0: function MyProtoValuelessObject() {
michael@0:   this.valueOf = new Function ( "" );
michael@0:   this.__proto__ = null;
michael@0: }
michael@0: function MyProtolessObject( value ) {
michael@0:   this.valueOf = new Function( "return this.value" );
michael@0:   this.__proto__ = null;
michael@0:   this.value = value;
michael@0: }
michael@0: function MyValuelessObject(value) {
michael@0:   this.__proto__ = new MyPrototypeObject(value);
michael@0: }
michael@0: function MyPrototypeObject(value) {
michael@0:   this.valueOf = new Function( "return this.value;" );
michael@0:   this.toString = new Function( "return (this.value + '');" );
michael@0:   this.value = value;
michael@0: }
michael@0: function MyObject( value ) {
michael@0:   this.valueOf = new Function( "return this.value" );
michael@0:   this.value = value;
michael@0: }
michael@0: function MyOtherObject( value ) {
michael@0:   this.valueOf = new Function( "return this.value" );
michael@0:   this.toString = new Function ( "return this.value + ''" );
michael@0:   this.value = value;
michael@0: }