Re: Flex and EOF

"Russ Cox" <rsc@swtch.com>
9 Apr 2006 16:59:57 -0400

          From comp.compilers
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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)
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From: "Russ Cox" <rsc@swtch.com>
Newsgroups: comp.compilers
Date: 9 Apr 2006 16:59:57 -0400
Organization: Compilers Central
References: 06-04-035
Keywords: lex
Posted-Date: 09 Apr 2006 16:59:57 EDT

> 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.


Since . doesn't match \n, wouldn't #.* work just fine in either case?
And then you get the \n as a separate token, which might be beneficial
for line counting purposes anyway.


Russ

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