Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!crdgw1!lorensen
From: lorensen@dwaskill.crd.ge.com (Bill Lorensen)
Newsgroups: comp.unix.questions
Subject: Re: Hiding Yacc vars
Message-ID: <LORENSEN.89Jun15071542@dwaskill.crd.ge.com>
Date: 15 Jun 89 11:15:42 GMT
Sender: news@crdgw1.crd.ge.com
Distribution: usa
Organization: GE Corporate Research & Development
Lines: 23


I met Steve Johnson about six months ago. Steve is the author of yacc.
I complained about the use of external variables in yacc. He mentioned
that a prototype file for yyparse exists. Yacc uses it to create the
parser, including user code at an indicated location.

Sure enough, there is a prototype file in /usr/lib called yaccpar. It
appears to be undocumented but I think you can modify this file as the
posters have requested. Also, in /usr/lib/lex there are two prototype
files, one for c and one for ratfor.

I don't know if you can get yacc (or lex) to use your own prototype
files via some command line option. Otherwise, your modifications will
be used by everyone on the system (dangerous of course).
--
Bill Lorensen
	US Mail:GE Corporate Research and Development
		P.O. Box 8
		Bldg KW Room C207A
		Schenectady, NY 12301
	Office: (518) 387-6744 or 8*833-3874
	Fax:	(518) 387-6560 or 8*833-6560
	E-Mail: lorensen@crd.steinmetz.ge.com