Hello everyone,



After generating an AST from Antlr how can I selectively avoid the evaluation of sub elements in a Tree during
pattern matching in Antlr Tree Parser Section.


For example in the following code:



#("while" e:expression s:statements) {

while( expr(#e) != 0 )

stmts(#s);

}




both e:expression and s:statemnts are evaluated by Antlr
(rule procedures expr and stmts are called by Antlr as well)
for matching this tree pattern but can't the matching of
expression be done on just by comparing the root elements
of expression and statements elements. Alternately Is there
an easier way to execute this while loop construct easily
with out generating intermediate assembly like code (that can be interpreted later) or hand coding the tree walker.



Thanks

Ranjith