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

[Ric Klaren]

On Tue, Aug 17, 2004 at 01:15:43PM -0000, jm_newton wrote:
> 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";

Try:  class MyTreeParser extends TreeParser("MyTreeParserState");

> Does anybody have any experience of trying to extend the C++
> TreeParser to add state in this way or are there better ways...

Did you notice the template grammar in doc/cpp-runtime.html it lists all
the spots where you can insert code into the generated file. E.g. how to
add attributes/methods to the generated class (or override methods).

Cheers,

Ric
-- 
-----+++++*****************************************************+++++++++-------
    ---- Ric Klaren ----- j.klaren at utwente.nl ----- +31 53 4893755  ----
-----+++++*****************************************************+++++++++-------
  Before they invented drawing boards, what did they go back to?



 
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