[antlr-interest] Reparsing a subtree. Or another solution?
Joan Pujol
joanpujol at gmail.com
Tue Nov 16 13:44:01 PST 2004
Hello,
The small question is:
How can I reparse a subtree when parsing the complete AST using a treeparser?
I need this, because, is the best form I have found to solve this problem.
I have:
expression[rvalue]:
procedurecall(expressionlist[BitSet])
|IDENT { Code to check if ident is initialized and other checks}
;
expressionlist[Bitset]: (expression[rvalue])+ //Each rvalue is fixed
acording a position in the BitSet.
The problem is that I have input,output and input/output parameters in
procedurecalls. For the output parameters I have to mark rvalue as
false. But the problem is that I can't do it because I can't determine
wich is the procedure to call until I have parsed the expressionlist
(Then I can't determine if the parameter is an output one).
And then I have though that I need to parse one time to get the types
and another to do the checks. But I want to only parse this part of
the tree.
This is the best solution? Or there is something wrong in my design?
Also I though that I have to add a parameter to expression -->
expression[rvalue,noerrors]. To set noerrors to true in the first
pass. To avoid to report the errors twice.
A lot of thanks in advance,
--
Joan Jesús Pujol Espinar
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