[antlr-interest] rewriting stream or generate own trees
Gregor Pardella
kruemmel99 at yahoo.de
Tue Feb 22 02:55:06 PST 2005
Hi,
I'm relativly new to ANTLR and I've got a (possibly
trivial) problem:
I'm working on a compiler for a C-like language, and
parsing was not such a
big deal, but:
the source C-like language allows code like this:
int a=0;
a++;
or
int a = 0; int b;
b = a++
The problem is now, that the target language (a XML
assembler like one) has no
OP-Code for INCREMENT :(
So now I want to replace the INCREMENT (e.g. a++)
calls by (a=a+1) _on-the-fly_.
(maybe in the lexer but preferable in the parser).
Now I construct trees like:
a++ => ++
generates tree |_ a
but I want to have
a++ => =
|_ a
|_ +
|_ a
|_ 1
My expression definition looks like the one in java.g
which can be found on
the ANTLR web-site.
Is there a cute trick doing it, or is the only
solution to build
a preprocessor and replace it before starting
parsing??
Thanks for your help.
gregor
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