[antlr-interest] confused on tree grammar...
Pady Srinivasan
padysrini at hotmail.com
Thu Jan 1 00:27:03 PST 2009
If I have a predicate to make a decision on which node to execute, why would
antlr lookahead into the node before checking on the decision ? So if I have
a ast as follows -
root --> { condition, trueBlock, falseBlock }
I want
if ( condition )
trueBlock;
else
falseBlock;
So I use a predicate in my tree grammar to define this. But antlr always
generates,
if ( condition && trueBlock )
trueBlock;
else if ( !condition && falseBlock )
falseBlock;
If I were to write my own tree walker, I would be doing the former by just
gettting the children and executing the child method that corresponds to the
condition. Why would antlr do a lookahead while handling this predicate ?
Thx
-- pady
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