At 20:41 +0000 2005/03/03, Derek M Jones wrote: >The statement (y)+z can be parsed as casting >+z to the type y, or as adding y to z. A couple of >%dprecs solve this problem (I think the cast is the >common case for - and a binary expression for +).
The normal way to resolve this would be to let the lexer check the lookup table to see what y is: a type or a number identifier, and then return that type. WHy does this not work for you. >However, things are more complicated for x + (y) + z, >whose parse tree can be either > > + > / \ > x ( ) > / \ > y + > | > z > >or > > + > / \ > + z > / \ > x (y) > >As currently implemented the %dprec functionality does >not appear to be any help here. Effectively, it will only >select between two productions that consume the same >number of input tokens. The commands %left and %right handles left and right associativity. Hans Aberg _______________________________________________ Help-bison@gnu.org http://lists.gnu.org/mailman/listinfo/help-bison
