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| |
| gTestfile = '11.6.1-1.js'; |
| |
| /** |
| File Name: 11.6.1-1.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 not cover cases where the Additive or Mulplicative expression |
| ToPrimitive is string. |
| |
| Author: christine@netscape.com |
| Date: 12 november 1997 |
| */ |
| var SECTION = "11.6.1-1"; |
| var VERSION = "ECMA_1"; |
| startTest(); |
| |
| writeHeaderToLog( SECTION + " The Addition operator ( + )"); |
| |
| // tests for "MyValuelessObject", where the value is |
| // set in the object's prototype, not the object itself. |
| |
| new TestCase( SECTION, |
| "var EXP_1 = new MyValuelessObject(true); var EXP_2 = new MyValuelessObject(false); EXP_1 + EXP_2", |
| 1, |
| eval("var EXP_1 = new MyValuelessObject(true); var EXP_2 = new MyValuelessObject(false); EXP_1 + EXP_2") ); |
| |
| new TestCase( SECTION, |
| "var EXP_1 = new MyValuelessObject(new Boolean(true)); var EXP_2 = new MyValuelessObject(new Boolean(false)); EXP_1 + EXP_2", |
| "truefalse", |
| eval("var EXP_1 = new MyValuelessObject(new Boolean(true)); var EXP_2 = new MyValuelessObject(new Boolean(false)); EXP_1 + EXP_2") ); |
| |
| // tests for "MyValuelessObject", where the value is |
| // set in the object's prototype, not the object itself. |
| |
| |
| new TestCase( SECTION, |
| "var EXP_1 = new MyValuelessObject(100); var EXP_2 = new MyValuelessObject(-1); EXP_1 + EXP_2", |
| 99, |
| eval("var EXP_1 = new MyValuelessObject(100); var EXP_2 = new MyValuelessObject(-1); EXP_1 + EXP_2") ); |
| |
| new TestCase( SECTION, |
| "var EXP_1 = new MyValuelessObject(new Number(100)); var EXP_2 = new MyValuelessObject(new Number(-1)); EXP_1 + EXP_2", |
| "100-1", |
| eval("var EXP_1 = new MyValuelessObject(new Number(100)); var EXP_2 = new MyValuelessObject(new Number(-1)); EXP_1 + EXP_2") ); |
| |
| new TestCase( SECTION, |
| "var EXP_1 = new MyValuelessObject( new MyValuelessObject( new Boolean(true) ) ); EXP_1 + EXP_1", |
| "truetrue", |
| eval("var EXP_1 = new MyValuelessObject( new MyValuelessObject( new Boolean(true) ) ); EXP_1 + EXP_1") ); |
| |
| 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; |
| } |