[antlr-interest] Composing tree grammars

[Andreas Meyer]

Hi!

 

I am using ANTLR 3.1 and I want to compose tree grammars in a way, that I
have one "base" grammar that contains all rules, in order to define a
traversal, but without actions/rewrites. Then, a second grammar imports the
"base" grammar, and overrides only some rules. Now, if I try to use the
second grammar on the input, the ANTLR runtimes complain about mismatched
input: it seems that internally, the walker does not consume enough tokens,
so that it expects the tokens "behind" the current token. FYI, I used the
java/simplecTreeWalker example from the antlr 3.1 distribution and basically
copied the walker, spelled "import ." and removed all but one rule from the
copy.

 

Did I use composite tree grammars in a wrong way? If so, how can I define
multiple tree grammars for only small parts of the grammar?

Andreas Meyer
Developer
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