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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