| /* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */ |
| /* This Source Code Form is subject to the terms of the Mozilla Public |
| * License, v. 2.0. If a copy of the MPL was not distributed with this |
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| |
| |
| /** |
| File Name: 11.6.1-3.js |
| ECMA Section: 11.6.1 The addition operator ( + ) |
| Description: |
| |
| The addition operator either performs string concatenation or numeric |
| addition. |
| |
| The production AdditiveExpression : AdditiveExpression + MultiplicativeExpression |
| is evaluated as follows: |
| |
| 1. Evaluate AdditiveExpression. |
| 2. Call GetValue(Result(1)). |
| 3. Evaluate MultiplicativeExpression. |
| 4. Call GetValue(Result(3)). |
| 5. Call ToPrimitive(Result(2)). |
| 6. Call ToPrimitive(Result(4)). |
| 7. If Type(Result(5)) is String or Type(Result(6)) is String, go to step 12. |
| (Note that this step differs from step 3 in the algorithm for comparison |
| for the relational operators in using or instead of and.) |
| 8. Call ToNumber(Result(5)). |
| 9. Call ToNumber(Result(6)). |
| 10. Apply the addition operation to Result(8) and Result(9). See the discussion below (11.6.3). |
| 11. Return Result(10). |
| 12. Call ToString(Result(5)). |
| 13. Call ToString(Result(6)). |
| 14. Concatenate Result(12) followed by Result(13). |
| 15. Return Result(14). |
| |
| Note that no hint is provided in the calls to ToPrimitive in steps 5 and 6. |
| All native ECMAScript objects except Date objects handle the absence of a |
| hint as if the hint Number were given; Date objects handle the absence of a |
| hint as if the hint String were given. Host objects may handle the absence |
| of a hint in some other manner. |
| |
| This test does only covers cases where the Additive or Mulplicative expression |
| is a Date. |
| |
| Author: christine@netscape.com |
| Date: 12 november 1997 |
| */ |
| var SECTION = "11.6.1-3"; |
| var VERSION = "ECMA_1"; |
| startTest(); |
| |
| writeHeaderToLog( SECTION + " The Addition operator ( + )"); |
| |
| // tests for a boolean primitive and a boolean object, and |
| // "MyValuelessObject", where the value is set in the object's |
| // prototype, not the object itself. |
| |
| var DATE1 = new Date(); |
| |
| var MYOB1 = new MyObject( DATE1 ); |
| var MYOB2 = new MyValuelessObject( DATE1 ); |
| var MYOB3 = new MyProtolessObject( DATE1 ); |
| var MYOB4 = new MyProtoValuelessObject( DATE1 ); |
| |
| new TestCase( SECTION, |
| "MYOB2 = new MyValuelessObject(DATE1); MYOB3 + 'string'", |
| DATE1.toString() + "string", |
| MYOB2 + 'string' ); |
| |
| new TestCase( SECTION, |
| "MYOB2 = new MyValuelessObject(DATE1); MYOB3 + new String('string')", |
| DATE1.toString() + "string", |
| MYOB2 + new String('string') ); |
| /* |
| new TestCase( SECTION, |
| "MYOB3 = new MyProtolessObject(DATE1); MYOB3 + new Boolean(true)", |
| DATE1.toString() + "true", |
| MYOB3 + new Boolean(true) ); |
| */ |
| |
| test(); |
| |
| function MyProtoValuelessObject() { |
| this.valueOf = new Function ( "" ); |
| this.__proto__ = null; |
| } |
| function MyProtolessObject( value ) { |
| this.valueOf = new Function( "return this.value" ); |
| this.__proto__ = null; |
| this.value = value; |
| } |
| function MyValuelessObject(value) { |
| this.__proto__ = new MyPrototypeObject(value); |
| } |
| function MyPrototypeObject(value) { |
| this.valueOf = new Function( "return this.value;" ); |
| this.toString = new Function( "return (this.value + '');" ); |
| this.value = value; |
| } |
| function MyObject( value ) { |
| this.valueOf = new Function( "return this.value" ); |
| this.value = value; |
| } |