Re: Flex and EOF

Chris Dodd <cdodd@acm.org>
9 Apr 2006 16:59:21 -0400

          From comp.compilers
Related articles
Flex and EOF matteo.corti@gmail.com (Matteo Corti) (2006-04-08)
Re: Flex and EOF cdodd@acm.org (Chris Dodd) (2006-04-09)
Re: Flex and EOF rsc@swtch.com (Russ Cox) (2006-04-09)
Re: Flex and EOF tmk@netvision.net.il (Michael Tiomkin) (2006-04-09)
Re: Flex and EOF DrDiettrich@compuserve.de (Hans-Peter Diettrich) (2006-04-10)
Re: Flex and EOF matteo.corti@gmail.com (Matteo Corti) (2006-04-12)
Re: Flex and EOF idbaxter@semdesigns.com (Ira Baxter) (2006-04-12)
| List of all articles for this month |
From: Chris Dodd <cdodd@acm.org>
Newsgroups: comp.compilers
Date: 9 Apr 2006 16:59:21 -0400
Organization: Compilers Central
References: 06-04-035
Keywords: lex
Posted-Date: 09 Apr 2006 16:59:21 EDT

Matteo Corti <matteo.corti@gmail.com> wrote in news:06-04-035@comp.compilers:
> I have a rule in my lexer to skip shell-like comments:
>
> #.*$ /* skip comments */
>
> which works just fine if there is \n at the end of the line.
> If the comment is in the last line wich is terminated by EOF the rule
> obviously fails.


What's wrong with just doing


#.* /* skip comments */


The only difference between this rule and the rule above is that it will
match a comment at the end of the input without a following newline. The
longest match rule means you'll always get the entire comment up to the
end of the line or file.


-chris


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