[antlr-interest] Tree-building problem ...

Anthony Youngman Anthony.Youngman at ECA-International.com
Tue Jun 8 07:45:44 PDT 2004


I'm trying to build a tree. Problem is, I'm trying to create tokens in
the parser, and can't see how to do it. Here's my parser code ...

//printst : ( PRINT^ (expr (COLON)? )? );
printst :
//	( PRINT! {#[IDENT,"!PRINT"]; #[LPAREN, "("];} (expr (COLON!
{#[NUMBER_LITERAL,"1"];})? )? )
	( PRINT! {#printst = #[IDENT,"!PRINT"], #[LPAREN, "("];} (expr
(COLON! {#[NUMBER_LITERAL,"1"];})? )? )
	{ ## = #(#[FUNCTIONCALL,"function-call"], ##); }
	;

The first, commented out, version simply returned a root of "PRINT" with
"expr" and "COLON" as its children. My second attempt - the second
commented out line, returns the required root of FUNCTIONCALL, but it
only has one child, namely "expr".

What I'm trying to do is return a tree who's root is FUNCTIONCALL and
which has, as a minimum, the children "!PRINT", "(" and ")" (and yes,
I've just realised I've forgotten the ")"). It should also have the
children "expr" and "1" if they exist.

Cheers,
Wol


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