[Laszlo-dev] For Review: Change 20080107-ptw-n Summary: Implement `is` operator

[Donald Anderson]

Thanks, and sorry for the delay on the review (just sent, approved  
with comments).
I think I'll wait for you to do 'as' and then I'll merge to devildog
and do anything needed for SWF9 for is/as.


On Jan 8, 2008, at 9:13 AM, P T Withington wrote:

> I checked this in so I can start on LPP-5336.  If you have comments,  
> I will address them in a subsequent patch.  When I finish 5336, you  
> should integrate from trunk to devildog.
>
> On 2008-01-07, at 16:10 EST, P T Withington wrote:
>
>> Change 20080107-ptw-n by ptw at dueling-banjos.local on 2008-01-07  
>> 15:41:52 EST
>>   in /Users/ptw/OpenLaszlo/ringding-2
>>   for http://svn.openlaszlo.org/openlaszlo/trunk
>>
>> Summary: Implement `is` operator
>>
>> Bugs Fixed:
>> LPP-3632 'Implement `is` operator'
>>
>> Technical Reviewer: dda at ddanderson.com (pending)
>> QA Reviewer: henry.minsky at gmail.com (pending)
>> Doc Reviewer: lou at louiorio.com (pending)
>>
>> Documentation:
>> We now implement the ECMAScript 4 `is` operator
>>
>> Details:
>>   lztest-class-impl: Use modern syntax, verify that `is` is
>>   equivalent to `instanceof` and works properly for mixins.
>>
>>   Class: add runtime support for `is` operator on mixins
>>
>>   JavascriptGenerator, CodeGenerator, ParseTreePrinter, Parser:  Add
>>   support for `is` operator, which in JS1 runtimes is approximated
>>   as:  a is b => b['$lzsc$isa'] ? b.$lzsc$isa(a) : (a instanceof b),
>>   relying on the runtime support in Class for $lzsc$isa.
>>
>>   ASTVisitor: remove the unused visitBinaryExpression
>>
>> Tests:
>>   Amended class-impl test to test that `is` is equivalent to
>>   `instanceof` for classes and works properly for mixins.
>>
>> Files:
>> M      test/lztest/lztest-class-impl.lzx
>> M      WEB-INF/lps/lfc/compiler/Class.lzs
>> M      WEB-INF/lps/server/src/org/openlaszlo/sc/ 
>> JavascriptGenerator.java
>> M      WEB-INF/lps/server/src/org/openlaszlo/sc/ASTVisitor.java
>> M      WEB-INF/lps/server/src/org/openlaszlo/sc/CodeGenerator.java
>> M      WEB-INF/lps/server/src/org/openlaszlo/sc/ParseTreePrinter.java
>> M      WEB-INF/lps/server/sc/src/org/openlaszlo/sc/Parser.jjt
>>
>> Changeset: http://svn.openlaszlo.org/openlaszlo/patches/20080107-ptw-n.tar
>


--

Don Anderson
Java/C/C++, Berkeley DB, systems consultant

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email: dda at ddanderson.com
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