Hans, >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.
Because I don't have a symbol table to look things up in. Perhaps I should have pointed this out (it also answers Frank Heckenbach's question). When parsing the visible source (ie not doing any preprocessing; well apart from ignoring the directives) a statement/declaration at a time the content of a symbol table are likely to be very incomplete. >The commands %left and %right handles left and right associativity. Good alternative suggestion. But this still requires tree rewriting after the expression has been parsed. My %gooa option proposal avoids this grammar violence. derek -- Derek M Jones tel: +44 (0) 1252 520 667 Knowledge Software Ltd mailto:[EMAIL PROTECTED] Applications Standards Conformance Testing http://www.knosof.co.uk _______________________________________________ Help-bison@gnu.org http://lists.gnu.org/mailman/listinfo/help-bison
