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:          11.6.1-3.js
michael@0:    ECMA Section:       11.6.1 The addition operator ( + )
michael@0:    Description:
michael@0: 
michael@0:    The addition operator either performs string concatenation or numeric
michael@0:    addition.
michael@0: 
michael@0:    The production AdditiveExpression : AdditiveExpression + MultiplicativeExpression
michael@0:    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 ToPrimitive(Result(2)).
michael@0:    6.  Call ToPrimitive(Result(4)).
michael@0:    7.  If Type(Result(5)) is String or Type(Result(6)) is String, go to step 12.
michael@0:    (Note that this step differs from step 3 in the algorithm for comparison
michael@0:    for the relational operators in using or instead of and.)
michael@0:    8.  Call ToNumber(Result(5)).
michael@0:    9.  Call ToNumber(Result(6)).
michael@0:    10. Apply the addition operation to Result(8) and Result(9). See the discussion below (11.6.3).
michael@0:    11. Return Result(10).
michael@0:    12. Call ToString(Result(5)).
michael@0:    13. Call ToString(Result(6)).
michael@0:    14. Concatenate Result(12) followed by Result(13).
michael@0:    15. Return Result(14).
michael@0: 
michael@0:    Note that no hint is provided in the calls to ToPrimitive in steps 5 and 6.
michael@0:    All native ECMAScript objects except Date objects handle the absence of a
michael@0:    hint as if the hint Number were given; Date objects handle the absence of a
michael@0:    hint as if the hint String were given. Host objects may handle the absence
michael@0:    of a hint in some other manner.
michael@0: 
michael@0:    This test does only covers cases where the Additive or Mulplicative expression
michael@0:    is a Date.
michael@0: 
michael@0:    Author:             christine@netscape.com
michael@0:    Date:               12 november 1997
michael@0: */
michael@0: var SECTION = "11.6.1-3";
michael@0: var VERSION = "ECMA_1";
michael@0: startTest();
michael@0: 
michael@0: writeHeaderToLog( SECTION + " The Addition operator ( + )");
michael@0: 
michael@0: // tests for a boolean primitive and a boolean object, and
michael@0: // "MyValuelessObject", where the value is set in the object's
michael@0: // prototype, not the object itself.
michael@0: 
michael@0: var DATE1 = new Date();
michael@0: 
michael@0: var MYOB1 = new MyObject( DATE1 );
michael@0: var MYOB2 = new MyValuelessObject( DATE1 );
michael@0: var MYOB3 = new MyProtolessObject( DATE1 );
michael@0: var MYOB4 = new MyProtoValuelessObject( DATE1 );
michael@0: 
michael@0: new TestCase(   SECTION,
michael@0:                 "MYOB2 = new MyValuelessObject(DATE1); MYOB3 + 'string'",
michael@0:                 DATE1.toString() + "string",
michael@0:                 MYOB2 + 'string' );
michael@0: 
michael@0: new TestCase(   SECTION,
michael@0:                 "MYOB2 = new MyValuelessObject(DATE1); MYOB3 + new String('string')",
michael@0:                 DATE1.toString() + "string",
michael@0:                 MYOB2 + new String('string') );
michael@0: /*
michael@0:   new TestCase(   SECTION,
michael@0:   "MYOB3 = new MyProtolessObject(DATE1); MYOB3 + new Boolean(true)",
michael@0:   DATE1.toString() + "true",
michael@0:   MYOB3 + new Boolean(true) );
michael@0: */
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: }