[antlr-interest] Grammar dependencies (was Re: Expected token apparently not expected?!)

[David Bullock]

--- In antlr-interest at yahoogroups.com, Ric Klaren <klaren at c...> wrote:
> Always use import/export vocab in a clear chain. E.g. have 
definitions move
> up:
> 
> Lexer -> Parser -> treeparser

Hi Ric,

Thanks for your reply (which got me a solution in the end!).

I guess the problem is that if you use literals in the parser, then 
the lexer needs to get these somehow.  This means that the grammar 
needs to be 'pushed back' to the lexer.

> In l.g do exportVocab = L;
> In p.g do importVocab = L; and exportVocab = P;

Instead I did:
 
  p.g   exportVocab = L;
  l.g   importVocab = P;

and compiled p.g first.

This seems counter-intutitive to me (and not to your taste either, I 
gather), but it makes my paser behave how I want it to.

IMHO it would be better to dispense with importing and exporting 
vocabularies, and have antlr.Tool accept multiple grammar files on 
the command-line, to achieve similar results as the 'all classes 
defined in one grammar file' semantics.

thanks!
David



 
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