[antlr-interest] Heterogeneous trees
Bogdanov, Serge
serge.bogdanov at intel.com
Tue May 3 08:11:47 PDT 2005
Peter,
It looks like you are trying to abuse antlr. I guess you
should've done it differently:
tokens {
SPECIAL1<AST=Special1AST>;
IDENT<AST=Special2AST>;
}
expr: (IDENT SPECIAL1)=> IDENT! SPECIAL^ | IDENT^ ;
or
expr: (IDENT SPECIAL1)=> IDENT SPECIAL^<AST=Special1AST> |
IDENT^<AST=Special2AST>;
>> Sergey Bogdanov
intel massachusetts
M/S HD2-246
77 Reed Road,
Hudson, MA 01749
Tel: (978)553-2724
________________________________
From: antlr-interest-bounces at antlr.org
[mailto:antlr-interest-bounces at antlr.org] On Behalf Of Peter Kronenberg
Sent: Tuesday, May 03, 2005 11:05 AM
To: antlr-interest at antlr.org
Subject: [antlr-interest] Heterogeneous trees
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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