Compilers construction tools questions

"Salvador Valerio Cavadini" <>
24 Jun 1998 00:15:29 -0400

          From comp.compilers

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From: "Salvador Valerio Cavadini" <>
Newsgroups: comp.compilers
Date: 24 Jun 1998 00:15:29 -0400
Organization: Compilers Central
Keywords: question
X-Originating-IP: []

                  I'm working in a research proyect about compilers construction
tools and I have some questions (and problems):

  1- I'm testing a tool called YAY ver. 1.0 and I found there are
  when it is used with the +LR2 switch, since the generated parser reject
  correct programs. Somebody have this problem too? How can I fix it?

  2- Is 1.9 the lastest version of BYACC for DOS?

  3- I downloaded the Ada grammar from comp.compilers file repository.
  This grammar uses a notation that I didn't see before.
                  NT : /* empty */
                                  | ..NT.. NT

  What means the two point ("..") before and after NT? The grammar
  documentation sais that is a "Yacckeable" version of EBNF. It is? The
  original Yacc accept EBNF? I compiled the grammar with diferent Yacc
  versions, most returned an error, others (included original Yacc)
  compiles but I noted that they not "understand" ..NT.. like EBNF.


  Salvador Cavadini
  Santiago del Estero - Argentina

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