Re: [cdt-dev] LR parser and LPG version

[Mike Kucera <mkucera@xxxxxxxxxx>]

The hand written parser has a few features that the LR parser still doesn't support yet, like parsing declarations inside inactive code blocks. The fact that CDT has two parser frameworks is actually a bit controversial....


Mike Kucera
Software Developer
Eclipse CDT/PTP
IBM Toronto
mkucera@xxxxxxxxxx

Mike Wrighton ---03/03/2010 11:12:42 AM---Thanks. I was also wondering if anyone knew why CDT still uses the hand-written parser (6.0.1, anyway) when the generated parse

From:	Mike Wrighton <mike.wrighton@xxxxxxxxxxxxxx>
To:	"CDT General developers list." <cdt-dev@xxxxxxxxxxx>
Cc:	cdt-dev-bounces@xxxxxxxxxxx
Date:	03/03/2010 11:12 AM
Subject:	Re: [cdt-dev] LR parser and LPG version

---

Thanks. I was also wondering if anyone knew why CDT still uses the hand-written parser (6.0.1, anyway) when the generated parsers are presumably faster and the code more maintainable?

On 3 March 2010 15:48, Mike Kucera <mkucera@xxxxxxxxxx> wrote:

Its easiest to get the LPG 1.1 runtime from Orbit. Find the org.eclipse.orbit folder in CVS and check out the net.sourceforge.lpg.lpgjavaruntime project. The project will initially be empty, right click on the project and select Team > Switch to another branch or version, then select the v1_1 branch. That will give you a project with all the source for LPG 1.1 in your workspace, which is very useful.

Alternatively I think you can download the runtime as a plugin jar from the orbit page on eclipse.org and just drop it in your plugins folder. The sourceforge page provides the runtime as a normal jar file, but its the orbit project that provides a plugin wrapper for the jar so that it can be used easily with eclipse.

I'm getting enough requests for documentation for the LR parser that I think I'm going to have to start writing some :)




Mike Kucera
Software Developer
Eclipse CDT/PTP
IBM Toronto
mkucera@xxxxxxxxxx

Mike Wrighton ---03/03/2010 10:35:17 AM---Hi,


From:	Mike Wrighton <mike.wrighton@xxxxxxxxxxxxxx>
To:	"CDT General developers list." <cdt-dev@xxxxxxxxxxx>
Date:	03/03/2010 10:35 AM
Subject:	Re: [cdt-dev] LR parser and LPG version

---




Hi,

I was just wondering if there are any instructions for using the LR
parser, for example where do I get net.sourceforge.lpg.lpgjavaruntime?
I downloaded the org.eclipse.cdt.core.lrparser plugins from CVS and
the LPG distribution zip, as well as some code from
lpg.cvs.sourceforge.net but I'm a bit lost as I can't find a bundle
called net.sourceforge.lpg.lpgjavaruntime.

Thanks,
Mike


On 2 March 2010 14:43, Mario Pierro <Mario.Pierro@xxxxxxx> wrote:
> Hello,
>
> I am experimenting with extending the new LR parser to recognize custom
> extensions to the CDT language.
>
> I can successfully build and run the checked out java files, but I am
> not able to correctly generate them from the .g grammar files - the
> files will contain syntax errors.
>
> I checked out the following plugins from CVS
>
> net.sourceforge.lpg.lpgjavaruntime
> org.eclipse.cdt.core.lrparser
> org.eclipse.cdt.core.lrparser.sdk
> org.eclipse.cdt.core.lrparser.sdk.feature
> org.eclipse.cdt.core.lrparser.tests
>
> I also downloaded the LPG 1.1 distribution from sourceforge
>
> http://sourceforge.net/projects/lpg/files/lpgdistribution/LPG-V1.1/lpgdi
> stribution-05-16-06.zip/download
>
> in order to obtain the parser generator executable (lpg.exe).
>
> I have set up the lpg_exe and lpg_template ant properties to point to
> the lpg.exe and the org.eclipse.cdt.core.lrparser/grammar/templates
> folder, respectively.
>
> I can run the build.xml script and generate the java sources, but the
> files created will contain syntax errors (like a "-a" instead of a "-1"
> in parser tables). I have also tried to use the lpg executables 2.0 but
> they will generate even more errors.
>
> What is the lpg version which has been used to build the parser sources
> in the lrparser plugin?
>
> Thanks for your help,
>
> /Mario
>
> _______________________________________________
> cdt-dev mailing list
> cdt-dev@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/cdt-dev
>
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