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[Xtext] ANTLR options [message #57438]

Mon, 13 July 2009 09:48

Mounir Stino

Messages: 3
Registered: July 2009

Junior Member

Hi,

I am migrating a project from oAW Xtext to TMF Xtext. My grammar has non
LL(*) decisions, and this problem was solved by the backtrack=true option
that was always set in the generated ANTLR file in oAW Xtext. TMF Xtext
however does not set this option by default. Is there a way to set this
option manually?

Thanks

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Re: [Xtext] ANTLR options [message #57465 is a reply to message #57438]

Mon, 13 July 2009 10:28

Eclipse User

You need the following entry in your mwe file :

<language uri="${grammarURI}" fileExtensions="${file.extensions}">
<fragment class="de.itemis.xtext.antlr.XtextAntlrGeneratorFragment">
<options backtrack="true" memoize="true" k="-1"/>
</fragment>
....

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Re: [Xtext] ANTLR options [message #57491 is a reply to message #57465]

Mon, 13 July 2009 11:17

Mounir Stino

Messages: 3
Registered: July 2009

Junior Member

Thanks Aleksey for your reply, but it is unfortunately still not working.
I put the fragment in the mwe file, and the file looks like:

<workflow>
...
<component class="org.eclipse.xtext.generator.Generator">
<pathRtProject value="${runtimeProject}"/>
<pathUiProject value="${runtimeProject}.ui"/>
<projectNameRt value="${projectName}"/>
<projectNameUi value="${projectName}.ui"/>

<language uri="${grammarURI}" fileExtensions="${file.extensions}">

<fragment class="de.itemis.xtext.antlr.XtextAntlrGeneratorFragment">
<options backtrack="true" memoize="true" k="-1"/>
</fragment>
...
</component>
</workflow>

It does not have any effect on the ANTLR generated files.

Thanks again.

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Re: [Xtext] ANTLR options [message #57515 is a reply to message #57491]

Mon, 13 July 2009 11:40

Knut Wannheden

Messages: 298
Registered: July 2009

Senior Member

Note that Xtext by default also generates an ANTLR grammar into the UI
project (used for content assist). Possibly the warnings you see in your
console pertain to that grammar. If that's the case you can also set the
backtrack option for your UI project. Replace the second
"org.eclipse.xtext.generator.DelegatingGeneratorFragment" fragment with:

<fragment class="de.itemis.xtext.antlr.XtextAntlrUiGeneratorFragment"/ >
<options backtrack="true" memoize="true"/>
</fragment>

Regards,

--knut

Mounir Stino wrote:
> Thanks Aleksey for your reply, but it is unfortunately still not
> working. I put the fragment in the mwe file, and the file looks like:
>
> <workflow>
> ..
> <component class="org.eclipse.xtext.generator.Generator">
> <pathRtProject value="${runtimeProject}"/>
> <pathUiProject value="${runtimeProject}.ui"/>
> <projectNameRt value="${projectName}"/>
> <projectNameUi value="${projectName}.ui"/>
>
> <language uri="${grammarURI}" fileExtensions="${file.extensions}">
> 
> <fragment
> class="de.itemis.xtext.antlr.XtextAntlrGeneratorFragment">
> <options backtrack="true" memoize="true" k="-1"/>
> </fragment>
> ..
> </component>
> </workflow>
>
> It does not have any effect on the ANTLR generated files.
>
> Thanks again.
>

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Re: [Xtext] ANTLR options [message #58399 is a reply to message #57515]

Tue, 14 July 2009 12:57

Mounir Stino

Messages: 3
Registered: July 2009

Junior Member

I managed to make the parser files work, but now I need the same options
for the ANTLR lexer files in both the standard and ui projects. Is there a
way to do it?

Thanks again.

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Re: [Xtext] ANTLR options [message #58418 is a reply to message #58399]

Tue, 14 July 2009 14:16

Sebastian Zarnekow

Messages: 3118
Registered: July 2009

Senior Member

Hi Mounir,

I'm afraid this is not possible at the moment. Have a look at this
bugreport from antlr:
http://www.antlr.org/jira/browse/ANTLR-321

If it is necessary to define lexer options you'll have to implement your
own generator fragment and define both a lexer and a parser grammar.
Feel free to file bugzilla :-)

Regards,
Sebastian

Am 14.07.2009 14:57 Uhr, schrieb Mounir Stino:
> I managed to make the parser files work, but now I need the same options
> for the ANTLR lexer files in both the standard and ui projects. Is there
> a way to do it?
>
> Thanks again.
>

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