[antlr-interest] Heterogeneous trees

[Peter Kronenberg]

I'm writing a parser that builds a heterogeneous tree.  The nodes are
based on the token type.  But I'm having a problem when a predicate is
needed to determine the correct token type.  Here's a contrived example.
An IDENT followed by SPECIAL1, I want to create a SPECIAL1 AST.  But an
IDENT by itself should be reflected as a SPECIAL2 type.
Before I added the different AST's, this parser worked, but now, the
IDENT node is just created using the default type.  How can I get it to
honor the AST that's specified in the tokens section?

tokens {
  SPECIAL1<AST=Special1AST>;
  SPECIAL2<AST=Special2AST>;
}

expr: (IDENT SPECIAL1)=> IDENT SPECIAL^ | i:IDENT^ {#i.setType(SPECIAL2)


Peter Kronenberg
Software Engineer
(703) 885-1222
pkronenberg at technicacorp.com


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