[antlr-interest] Quick ANTLR/ST question

[Bill Andersen]

Nevermind, answered my own question with some dim memories and some playing around.

On Aug 26, 2011, at 11:15 , Bill Andersen wrote:

> Hi all...
> 
> I have the following production alternative:
> 
>  | ^(ASTERISK e1=unary_expression e2=unary_expression)
> 
> and want to use templates that look like this in my STG:
> 
>     app2(op,e1,e2) ::= "<op>(<e1>,<e2>)"
> 
>     op_ASTERISK() ::= "mult"
> 
> Question is - if I want to keep the translation of ASTERISK in the STG, how do I express the template return in the alternative above.  E.g.,
> 
>  | ^(ASTERISK e1=unary_expression e2=unary_expression)
>         -> app2(op=???, e1={$e1.st}, e2={$e2.st})
> 
> What goes in the place of ??? to cause op_ASTERISK() to be inserted into the resulting ST?

The answer is:

	-> app2(op={%op_ASTERISK()}, e1={$e1.st}, e2={$e2.st})

Could not find this in any doc to save my life, but the generated code is correct.

> 
> Using ANTLR 3.3 / ST 3...
> 
> Thanks
> 
> 	.bill
> 
> 
> 
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