[antlr-interest] Rule return type limitations?

[Terence Parr]

Hi Rick. You need to say $bytes.outBytes to access return value.
ter
On Oct 14, 2007, at 5:37 PM, Rick Mann wrote:

> I would like to return an arbitrary object type from one of my  
> rules (an object I've defined outside of the grammar):
>
> ...
> sendCommand
> 	:	'send' bytes Semicolon {System.out.println("Sending " +  
> $bytes.toString);}
> 	;
>
> bytes returns [ByteBuf outBytes]
> 	:	e=StringLiteral {//some stuff here to create a ByteBuf from e  
> and return it};
>
> ...
>
> But when I try to generate the parser from this, I get
>
> ANTLR Parser Generator  Version 3.0.1 (August 13, 2007)  1989-2007
> error(116): ../CommScript.g3pl:34:27: unknown attribute for rule  
> bytes: toString
>
>
> Can I do this? What are the limitations on the return types?
>
> TIA,
>
> -- 
> Rick