In JS2 this operator is called `cast`. I propose that we use that term and that the swf9 back-end translate `cast` to `as`.

Updating summary per comment above.

r7768 | ptw | 2008-01-08 14:41:34 -0500 (Tue, 08 Jan 2008) | 31 lines
Changed paths:
   M /openlaszlo/trunk/WEB-INF/lps/server/sc/src/org/openlaszlo/sc/Parser.jjt
   M /openlaszlo/trunk/WEB-INF/lps/server/src/org/openlaszlo/sc/CodeGenerator.java
   M /openlaszlo/trunk/WEB-INF/lps/server/src/org/openlaszlo/sc/JavascriptGenerator.java
   M /openlaszlo/trunk/WEB-INF/lps/server/src/org/openlaszlo/sc/ParseTreePrinter.java
   M /openlaszlo/trunk/test/lztest/lztest-class-impl.lzx

Change 20080108-ptw-a by ptw@dueling-banjos.local on 2008-01-08 11:56:44 EST
    in /Users/ptw/OpenLaszlo/ringding-2
    for http://svn.openlaszlo.org/openlaszlo/trunk

Summary: add support for `cast` keyword in javascript

Bugs Fixed:
LPP-5336 'add support for `cast` keyword in javascript'

Technical Reviewer: dda@ddanderson.com (Message-Id: <AC18608E-42E5-4600-A8F0-89FDE03FCA17@ddanderson.com>)
QA Reviewer: henry.minsky@gmail.com (pending)
Doc Reviewer: lou@louiorio.com (pending)

Documentation:
We now support the JS2 `cast` operator: <value> cast <type
expression>. In JS1 runtimes this is a no-op. In JS2 runtimes it
will be passed through and ensures that the value is of the correct
static type.

Details:
    lztest-class-impl: Add tests suggested by Don for more complex
    `is` expressions. Add tests for `cast` expressions

    JavascriptGenerator, CodeGenerator, Parser, ParseTreePrinter: add
    support for `cast` as a no-op (just returns the value or lhs).
    Put back code that deals with null source files for now.

Tests:
    lztest-class-impl

To Don, to migrate to DevilDog (and implement the 'cast' -> 'as' translation for swf9 back-end).

Note: this addendum is SWF9 only, and fixed in devildog
Original change r7763 was fixed for RingDing only.
------------------------------------------------------------------------
r7773 | dda | 2008-01-08 16:53:49 -0500 (Tue, 08 Jan 2008) | 46 lines
Changed paths:
   M /openlaszlo/branches/devildog/WEB-INF/lps/server/src/org/openlaszlo/sc/SWF9Generator.java
   M /openlaszlo/branches/devildog/WEB-INF/lps/server/src/org/openlaszlo/sc/SWF9ParseTreePrinter.java

Change 20080108-dda-X by dda@lester.local on 2008-01-08 16:51:26 EST
    in /Users/dda/laszlo/src/svn/openlaszlo/branches/devildog
    for http://svn.openlaszlo.org/openlaszlo/branches/devildog

Summary: SWF9: Added support for 'cast' and 'is'

New Features:

Bugs Fixed: LPP-5336

Technical Reviewer: ptw (pending)
QA Reviewer: hminsky (pending)
Doc Reviewer: (pending)

Documentation:

Release Notes:

Details:
   Building on support in trunk just added for 'cast' and 'is', this change
   allows these keywords to be passed through and emitted as is to the third
   party compiler.

   SWF9Generator.java: intercept JavascriptGenerator implementation of 'cast'
   and 'is' so they are not handled directly within the compiler, but left alone.

   SWF9ParseTreePrinter.java: added knowledge of 'cast' and 'is' operators
   to emit these as is.


Tests:
 1) Imported a few tests that use cast/is from lztest-class-impl.lzx into
   a private copy of LzNode.js:

  var xf1 = ( (new Sundae()) cast Vanilla instanceof Number );
  var xt1 = ( (new Number()) cast Object instanceof Number );
  var xf2 = ( (new Sundae()) cast Vanilla is Number );
  var xt2 = ( (new Number()) cast Object is Number );

   (along with modified versions of Sundae and Vanilla).
   Verified that these compiled and emitted the same in the output files
   fed to the third party compiler.

 2) did smoketest


------------------------------------------------------------------------

------------------------------------------------------------------------
r7773 | dda | 2008-01-08 16:53:49 -0500 (Tue, 08 Jan 2008) | 46 lines
Changed paths:
   M /openlaszlo/branches/devildog/WEB-INF/lps/server/src/org/openlaszlo/sc/SWF9Generator.java
   M /openlaszlo/branches/devildog/WEB-INF/lps/server/src/org/openlaszlo/sc/SWF9ParseTreePrinter.java

Change 20080108-dda-X by dda@lester.local on 2008-01-08 16:51:26 EST
    in /Users/dda/laszlo/src/svn/openlaszlo/branches/devildog
    for http://svn.openlaszlo.org/openlaszlo/branches/devildog

Summary: SWF9: Added support for 'cast' and 'is'

New Features:

Bugs Fixed: LPP-5336

Technical Reviewer: ptw (pending)
QA Reviewer: hminsky (pending)
Doc Reviewer: (pending)

Documentation:

Release Notes:

Details:
   Building on support in trunk just added for 'cast' and 'is', this change
   allows these keywords to be passed through and emitted as is to the third
   party compiler.

   SWF9Generator.java: intercept JavascriptGenerator implementation of 'cast'
   and 'is' so they are not handled directly within the compiler, but left alone.

   SWF9ParseTreePrinter.java: added knowledge of 'cast' and 'is' operators
   to emit these as is.


Tests:
 1) Imported a few tests that use cast/is from lztest-class-impl.lzx into
   a private copy of LzNode.js:

  var xf1 = ( (new Sundae()) cast Vanilla instanceof Number );
  var xt1 = ( (new Number()) cast Object instanceof Number );
  var xf2 = ( (new Sundae()) cast Vanilla is Number );
  var xt2 = ( (new Number()) cast Object is Number );

   (along with modified versions of Sundae and Vanilla).
   Verified that these compiled and emitted the same in the output files
   fed to the third party compiler.

 2) did smoketest


------------------------------------------------------------------------

(trunk 4 local build r7775)
Ran http://127.0.0.1:8080/trunk/test/lztest/lztest-class-impl.lzx in swf7, swf8 and dhtml and return:

INFO: Passed all suites.

Needs to be tested in devildog.

(trunk 4 local build r7930)

Ran http://127.0.0.1:8080/trunk/test/lztest/lztest-class-impl.lzx in swf7, swf8 and dhtml, returns:

INFO: Passed all suites.