RE: bison-includes for additional definitions and rules

[Wayne Green]

Perl script.

#!/usr/bin/perl -w
#############################################################################
#
#  yaccpp.pl -- Yacc preprocesor. Make it so we can only have one set
#    of token declarations.
#       perl yaccpp.pl master.yy > master.y
#     -w to permit warnings to be sent to make's output.
#############################################################################

#############################################################################
# includeum -- Include this file in stdout.
#############################################################################
sub includeum
{
   local($file,$input) = @_;   # get the file to include

   open($input,$file) || die "Unable to open file $file.";

   while(<$input>)
   {
      if(/^!!/)
      {
         $newfile = substr($_,2);
         includeum($newfile,'fh02');
      } else {
      print $_;
      }
   }
   close($input);

}#includeum

#############################################################################
# main
#############################################################################

   foreach $argfile (@ARGV)
   {
      includeum($argfile,'fh01');
   }

# end-of -script

add a line starting with !! to your base yacc file (I use extension .yy"
and produce .y files with script):
!!datetime.yytypes

-------- In context...
%{
#include ...   /* std c include statament section... !! works here too */
%}
%union {...}
%type ...
/* include the predefined types for shared rules about date and time */
!!datetime.yytypes
%%
/* my rules */

/* include the predefined rules */
!!daterules.yy
%%

------ Makefile

Foo.c : foo.yy datetime.yytypes daterules.yy otherstuff
        $(YACCPP) foo.yy > foo.y
        $(YACC) $(YACCSWITCHES) foo.y


-- Should just about do it. I brewed up the perl script, and it only nests
once. (!! files in the top level file only) Anybody have one that nests
more, let me know.

I typically develop under windows, so this message has been twisted a tad
to reflect what you might do under Linux/Unix.
Under MKS make/perl for windows:
YACCPP = perl yaccpp.pl

--Wayne

Wayne Green         InfoSavvy, LLC
address@hidden

> -----Original Message-----
> From: address@hidden [mailto:address@hidden
> Behalf Of Roul Oldenburger
> Sent: Thursday, August 01, 2002 1:12 AM
> To: address@hidden
> Subject: bison-includes for additional definitions and rules
>
>
> Hello there,
> I am new to the UNIX and Linux tools lex/yacc, flex/bison and I am
> looking for a way to include additional definitions and rules from `add-
> on` yacc files to a main-yacc-file. Because it seems to me that yacc
> does not implement any `yacc-includes´ I asked myself if Bison
> probably does implement such a possibility? If not, does somebody
> know an easy workaround?
>
> Thanks in advance
> Roul
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