[antlr-interest] AST Tree rewriting
Des Hartman
des at deshartman.com
Mon Mar 16 04:40:55 PDT 2009
I has just been reading up about AST tree rewriting and it seems to be
exactly what I need. However I am struggling to compile what I believe is a
very simple tree. I have tried it with language=Java, but the same errors.
Looks like ANTLRWorks does not understand tree rewrites??? The problem I am
having is that ANTLRWorks 1.2.3 with antlr-3.1.2 complains and will not
compile this code. It says
"Unexpected token: ^("
"expecting SEMI, found ')' "
LREF and IREF are defined in the Parser Formula and convertLocalReference
converts a reference like "A" to "{1}" in code.
tree grammar L2ITree;
options {
language=ActionScript;
tokenVocab=Formula;
ASTLabelType=CommonTree;
filter=true;
rewrite=true;
}
@members {
// This function gets overriden in the main code. Returns the IREF value
based on LREF value.
public function convertLocalReference(ref:CommonTree):Number {return
null;}
}
reference
: ^(LREF lr=NAME) { iref:Number = convertLocalReference($lr); }
-> ^(IREF iref)
;
===================================================
Thanks
Des
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