Hi there,
I hope this list is intendend to ask for support.
I am desperately trying to write a tree grammar for a do-while loop. I
got the following so far:
The source for the loop:
----------------------------
int $loop = 0
do {
$loop = $loop + 1
foo()
} while ($loop < 3)
for such a loop my parser gives me:
---------------------------------------
(= int ($ loop) 0) (do { (= ($ loop) (+ ($ loop) 1)) foo } (< ($
loop) 3))
TreeGrammar.g:
-----------------------
doWhileStatement
:
^(
head='do' '{' { int loopHead =
((CommonTree) head).getTokenStartIndex(); }
statementList
'}' e=expression { if (e.isTrue()) {
input.seek(loopHead);
doWhileStatement();
}
}
)
;
the TreeGrammar is able to recognize the loop, but I am not able to run
the loop a second time. as calling doWhileStatement() runs into an
exception. How can I traverse parts of my tree again?
I was looking for tutorials and found:
http://www.antlr.org/wiki/display/CS652/Tree-based+interpreters
... but it seems a bit out of date.
any help is appreciated
regards
Christian
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