Re: Several flex scanners share common rules/definitions?

Clint Olsen <clint@0lsen.net>
30 Jun 2004 22:58:28 -0400

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From: Clint Olsen <clint@0lsen.net>
Newsgroups: comp.compilers
Date: 30 Jun 2004 22:58:28 -0400
Organization: Comcast Online
References: 04-06-102
Keywords: lex
Posted-Date: 30 Jun 2004 22:58:28 EDT

On 2004-06-27, Markus Dehmann <markus.cl@gmx.de> wrote:
> I have two scanners that use basically the same regular expressions and
> differ only in a few details. How can I write the two lex files so that I
> don't have to write the common things twice?


Well, one way would be to put these common rules in a single file and then
include them using a general-purpose macro processor like m4 to snarf the
text into your flex input file. Unless you really have a ton of overlap I
don't see that it's really worth the hassle though.


-Clint



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