Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!vern
From: vern@utgard.cs.cornell.edu (Vern Paxson)
Newsgroups: gnu.utils.bug
Subject: Re: flex and multiple inputs
Message-ID: <33400@cornell.UUCP>
Date: 20 Oct 89 15:41:48 GMT
References: <ANDREWT.89Oct18222337@watsnew.waterloo.edu>
Sender: nobody@cornell.UUCP
Reply-To: vern@cs.cornell.edu (Vern Paxson)
Organization: Cornell Univ. CS Dept, Ithaca NY
Lines: 34

In article <ANDREWT.89Oct18222337@watsnew.waterloo.edu> andrewt@watsnew.waterloo.edu (Andrew Thomas) writes:
> I have recently tried to write a parser using bison and flex.  It
> worked fine on a single input file, but I wanted to read mulitple
> files and parse them in the same way....
> Eventually I changed the skeleton file to remove the
> 'static' definitions from the function 'yyrestart'....
> This has the desired effect, but now the
> line number counting I have put in the .l file is off by the number of
> lines in the previous file.   Is there a correct way to read multiple
> input files with one parser run?

Yes.  What you want to do is add a rule like:

	<<EOF>>	{
		if there's another input file
			{
			fclose( yyin );
			yyin = fopen( file, "r" );
			reset line number counter
			YY_NEW_FILE;
			}
		else
			return;
		}

This is a new feature so it may be somewhat buggy.  If you have
problems with it, send me mail.

		Vern


	Vern Paxson			      vern@cs.cornell.edu
	Computer Science Dept.		      decvax!cornell!vern
	Cornell University		      vern@LBL (bitnet)