Hi David,
I think this is possible with rewrite rules, but it depends on how you
structure you grammar:
e.g. Have lexer rules for STRING, INT, FLOAT so you could do things like
expr:
a=STRING '+' b=STRING -> ^(CONCATENATE a b)
| a=number '+' b=number -> ^(PLUS a b)
;
number:
INT
| FLOAT
;
This is just a quick brain-dump but might give you hints in the right
direction.
Tilman Bender
Student des Software Engineering
Hochschule Heilbronn
tben...@stud.hs-heilbronn.de
Am 15.05.2009 um 05:38 schrieb David Jameson:
> Is there any way to control the built-in tree generation (from an
> initial parse phase) based on semantics of what is being parsed?
>
> As a simple example, if I see the expression
> a + b
>
> then I want to produce
> (PLUS a b)
> or
> (CONCATENATE a b)
>
> depending on whether a and b are numeric or string.
>
>
> How can I do this with rewrite rules (for example)? Or do I have to
> construct my own trees?
>
>
> Thanks,
> D
>
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