On 1 Dec 2007, at 23:07, Natalia Wolyczko wrote:
I'm new to bison, first of all I've tried to write a simple "hello-
world" like program using flex/bison.
All I want is to see "boom!" message after reading two MLAH tokens,
which corresponds to input string of the same name i.e. "mlah".
This works fine, I'm able to see "boom!" message after typing mlah
twice, the things which I really don't get is why I see "syntax
errror" once mlah is entered third time? What I expected is the
situation in which I see "boom!" every two "mlah" occurences.
Can anybody please explain me what's going on?
Because you have written the grammar for a language matching exactly
that token sequence and nothing else. If you want to do what you
indicated, you need to do recursion - the Bison manual has some
sections on that. Also, check out the calculator example - good
starting point.
Hans Aberg
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