Re: Semantic actions in Yacc ?

[ Frazer Worley, #909980 DAD penned : ]
|o|
|o| eg. Consider a binary grammar.
|o|
|o| grammar : { SemanticBlk1() ; } digits { SemanticBlk2() ; }
|o| ;
|o|
|o| digits : /* empty */
|o| | {} digits {} digit {}


Try


                                          | digits {} digit {}


Basically, actions are just like any other non-terminals in yacc.
Unnecessarily interspersing them with terminals and non-terminals can cause
all sort of conflicts because of the one symbol lookahead. This is compounded
by the fact that no two actions are considered same even if they are empty.


Ciao!
Veeru.
--
Virendra K Mehta | IBM T J Watson Research Centre
c1veeru@watson.ibm.com | (914) 784-7774
viren@wipsys.soft.net |
--

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