Re: [Exist-development] Force developer to declare variable in specific xquery files.

[Dan M. <dan...@gm...>]

Hi Casey,

I think the only way I know how to do this would be to create a new custom
"grammar" file for a custom XQuery parser.  You would first need to create
a custom "ANTLR <http://www.antlr.org/>" grammar file.

You would then declare that this grammar must be used in your XQuery
declaration like this:

*xquery version "1.0-custom";*

Most people can pick up ANTLR after a few years of computer science classes
in creating compilers and parsers.  But be warned it is not easy.

Here is a link to the eXist xquery "grammar" file:

http://exist.svn.sourceforge.net/viewvc/exist/trunk/eXist/src/org/exist/xquery/parser/XQuery.g?revision=15599&view=markup

Once this is done you would also need a custom version of eXist compiled
with this grammar in place.

If you don't have time to learn ANTLR you might post request for help on
the ANTLR interest group antlr-interest.

- Dan

On Wed, Dec 28, 2011 at 12:31 PM, Casey Jordan <cas...@jo...>wrote:

> Since eXist has its own XQuery analyzer/compiler, would it be possible to
> enforce custom rules. Say a rule to force the developer into declaring
> certain variables in particular files?
>
> For example, we have "instance.xql" files in our application, which need
> to take a specific form. In the prolog I would like to force the developer
> to define a variable like:
>
> declare variable $app-name = "somevalue";
>
> And, if the compiler did not encounter this, it would throw an error?
>
> Thanks,
>
> Casey
>
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Dan McCreary
Semantic Solutions Architect
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