[antlr-interest] How to implement a "require" mechanism?

[Sébastien Mosser]

Le 12 nov. 2010 à 18:36, Michael Matera a écrit :

> Hi Sebastien,
> 
> There's an ANTLR wiki entry that shows how to do this:
> 
>> http://www.antlr.org/wiki/pages/viewpage.action?pageId=557057
> 
> It works by inserting tokens into your token stream which has the effect 
> of generating an AST at the point of the require.

The last code snippet perfectly fits my need. It's a shame that I don't use the "include" keyword when I googled my problem.


However, another simple question: How to handle properly cyclic inclusions?  I basically use a "visitedFile" table declared as a parser member. When I start the 'sub-parser', I set its visited table to the current one. And after the end of the sub-parse, I set mine to the one available in the sub-parser. 

Is there another solution? Mine looks like a hack :S

Cheers, 

--
 Sébastien Mosser
 http://sebastien-mosser.fr