Re: Several flex scanners share common rules/definitions?

John Millaway <johnmillaway@yahoo.com>
30 Jun 2004 22:58:38 -0400

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From: John Millaway <johnmillaway@yahoo.com>
Newsgroups: comp.compilers
Date: 30 Jun 2004 22:58:38 -0400
Organization: Compilers Central
References: 04-06-102
Keywords: lex
Posted-Date: 30 Jun 2004 22:58:37 EDT

--- 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?


Hi Markus, You've two options. You could use a preprocessor, such as `m4' or
a custom script, or you could include both scanners in the same file, but
within different start states.

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