[antlr-interest] Re: Adding state to a TreeParser (C++)

[jm_newton]

Hmm,
Obviously having a bad day.

declaring some suitable memebers in a {} block after the class
definition in the .g file is good enough for me...

--- In antlr-interest at yahoogroups.com, "jm_newton" <jm_newton at y...> wrote:
> Hi,
> I'm using ANTLR 2.7.4 to generate c++ code. I've managed to generate
> an AST tree via Lexer/Parser and now I'm interested in adding some
> state information to my TreeParser which I'm using to 'run' the tree.
> 
> Assuming I don't want to modify the files generated by ANTLR the
> cleanest way of doing this appears to be extending the TreeParser from
> my own base class which is derived from the ANTLR TreeParser. I can
> find  examples of this in the documentation for Java
> (http://www.antlr.org/doc/metalang.html#_bb6) but none for C++. 
> 
> I've tried the following in my .g file:
> 
>   class MyTreeParser extends "MyTreeParserState";
> 
> where MyTreeParserState is defined as:
> 
>   class MyTreeParserState : public antlr::TreeParser
>   {
>   ...
> 
> but this results in the following errors:
> 
>   BlobManagement.g:129:39: rule classDef trapped:
>   BlobManagement.g:129:39: expecting "Parser", found '"BlobManagement"'
>   error: aborting grammar 'BlobManagementLexer' due to errors
>   Exiting due to errors.
> 
> Does anybody have any experience of trying to extend the C++
> TreeParser to add state in this way or are there better ways...



 
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