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

[Monty Zukowski]

Your actions are creating nodes but you are not adding them to the  
tree.  They don't get added in automatically like parsed tokens do.

So, for instance, instead of {#[NUMBER_LITERAL,"1"];} you need  
something like {astFactory->addASTChild(currentAST,  
#[NUMBER_LITERAL,"1"]);} (in C++ mode)

Monty

On Jun 8, 2004, at 7:45 AM, Anthony Youngman wrote:

> 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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Monty Zukowski

ANTLR & Java Consultant -- http://www.codetransform.com
ANSI C/GCC transformation toolkit --  
http://www.codetransform.com/gcc.html
Embrace the Decay -- http://www.codetransform.com/EmbraceDecay.html



 
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