yacc and lex

I'm new with lex and yacc. Trying to write something like a
interpreter (using yacc because there is no yaic). It should scan a
file with a description of a data-format and at the same time scan the
data-file. Now there is something like:


while( field[0] == 'x' )
{
...
next field;
}


in the description-file. yacc is reading this once, finding it
syntactically correct. For the data-file i have to pass the body of
the loop more than once. I'm thinking 'bout an array of function
pointers that are executed when yacc reduces to a while-statement, for
each statement in the loop a pointer in the array.


Now i'm not very happy with this. Does anybody have a better idea ?


Help me please, Thank you.
[The array of function pointers approach is pretty popular. I've sure used
it a lot. -John]


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