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Re: ACTION-220 to Investigate into the "wttjs" tool to transform WebIDL example into testsuite

From: Thierry MICHEL <tmichel@w3.org>
Date: Mon, 29 Mar 2010 16:20:51 +0200
Message-ID: <4BB0B743.4080908@w3.org>
To: raphael.troncy@eurecom.fr
CC: Media Fragment <public-media-fragment@w3.org>
Yes sorry,

Did not look enough at the auto generated mailing address ...

thierry

RaphaŽl Troncy wrote:
> Dear Thierry,
> 
> I guess this message is targeted at the W3C Media Annotations WG and 
> could be safely ignored for the reader of the media fragments mailing 
> list, right?
> 
>   RaphaŽl
> 
> Le 29/03/2010 11:08, Thierry MICHEL a ťcrit :
>> Here are my comments following my ACTION-220 to Investigate into the
>> "wttjs" tool to transform WebIDL example into testsuite
>>
>> I have investigated into the "wttjs" tool [3]:
>>
>> 1- First phase is to prepare an IDL fragment that represents interfaces
>> and exceptions that should be implemented by Web browsers. The IDL
>> fragment must conform to the Web IDL specification.
>>
>> I have checked the API for Media Resource 1.0
>> http://www.w3.org/TR/2010/WD-mediaont-api-1.0-20100309/
>> http://dev.w3.org/2008/video/mediaann/mediaont-api-1.0/mediaont-api-1.0.html 
>>
>>
>>
>> For both documents, Validation of WebIDL fragments is currently not
>> easy. We should use the following markup :
>> <pre> that encompasses the WebIDL declaration should use a class="idl"
>> This would make it possible for the WebIDL checker [1] to detect WebIDL
>> fragments directly in the document itself. (this was requested by Dom
>> sometime a ago [2]).
>>
>>
>> 2- Second phase is to prepare a JSON file that contains supplemental
>> information on interfaces and exceptions to be tested. The JSON file can
>> contain two kinds of information:
>> a- instantiation instructions and
>> b- crash data.
>>
>> a - Instantiation instructions: Since an IDL fragment does not describe
>> possible ways to instantiate interfaces or exceptions defined in the
>> fragment, it is necessary to tell the script how to create host objects
>> and host exception objects implementing those interfaces and
>> exceptions.If the instantiation instruction for an interface or
>> exception is not provided, then any test case that requires an instance
>> of the interface or exception will not be generated.
>>
>> --> We currently have not defined in our API, ways to instantiate
>> interfaces and how to create objects from the browser perspective.
>>
>> For example using the WebIDL "Identifier" interface
>>
>> interface Identifier: MAObject {
>> attribute DOMString value;
>> attribute DOMString type;
>> };
>>
>> The associated JSON file that contains instantiation instruction data
>> would be as follows:
>> {
>> "Identifier": [
>> {
>> "id": "identifier-object",
>> "code": "code.to.createObject (1);"
>> }
>> , ...
>> ]
>> , ...
>> }
>>
>> Here are some related issues as discussed in the Device APIs and 
>> Policy WG
>> http://www.w3.org/2009/dap/track/issues/44
>> http://www.w3.org/2009/dap/track/issues/67
>>
>> b- Crash data: A test case sometimes crashes a Web browser. Since the
>> existence of a crashing test case prevents the use of automated test
>> harness, a way to avoid execution of test case that is known to crash a
>> certain browser is provided.
>> --> We may not need the crash data for browsers.
>>
>> Conclusion:
>> Currently the "wttjs" tool is not usable, unless we define in our API
>> the associated JSON file that contains instantiation instruction data
>> for each WebIDL fragtment.
>>
>> Talking more with Dom, he also explained thta this tool is not quite up
>> to date with the latest WebIDL spec. therefore we might meet some issues
>> with some interfaces, especially when using arrays.
>>
>> As a conclusion, I think before using this tool I think we should
>> defines manually some tests cases. This would probably clear up some
>> understanding how to construct these objects and then define
>> instantiation instruction data on a more general perspective.
>>
>> Thierry
>>
>> [1]. http://www.w3.org/2009/07/webidl-check
>> [2].
>> http://lists.w3.org/Archives/Public/public-media-annotation/2010Feb/0061.html 
>>
>>
>> [3]. http://suika.fam.cx/www/webidl2tests/readme
>>
>>
>>
> 
Received on Monday, 29 March 2010 14:21:14 GMT

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