[antlr-interest] Unfolding of loops with antlr?

[Jon Schewe]

I've got something I'd like to do with antlr and I'm not sure it's
possible.  I want to unfold loops with antlr inside the parser.  The
idea is this, say I've got an input file like below.  Now antlr has
given me the ability to write nice rules to parse this language and to
do various actions on each rule.  What I'd really like to do is to be
able to tell antlr to repeat a rule action on the same input stream
multiple times while I change some data outside.  Another option would
be for me to be able to duplicate a set of tokens during parsing.  Say
if I know the set of tokens between LOOP and END, could I tell antlr to
duplicate that set of tokens 10 times (since the loop goes from 1 to 10)
with an extra token added in to tell me the loop index during the
initial parse and then let the tree parser just walk the tree?

I'm sure I could hand the AST off to some custom method to do it, but
that seems like I'm duplicating what antlr is already doing in the tree
parser.

Params
i 5;

Variables
x[i];
y;

Constraints
LOOP index 1...10:
  loop[index]:
  f[index] = 10 * x[index];
END

simple:
g = 5 * y;

-- 
Jon Schewe | http://mtu.net/~jpschewe
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