From:	Thomas Demmer <demmer AT LSTM DOT Ruhr-UNI-Bochum DOT De>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Command Parser
Date:	Fri, 04 Apr 1997 10:19:56 +0100
Organization:	Lehrstuhl fuer Stroemungsmechanik
Lines:	43
Message-ID:	<3344C7BC.41C6@LSTM.Ruhr-UNI-Bochum.De>
References:	<01bc409f$afbb59c0$97c3b8cd AT scully>
NNTP-Posting-Host:	bvb.lstm.ruhr-uni-bochum.de
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Cephaler wrote:
[...]
> 
> Prog output: Enter a command: _
> User Input: /showfilestats math.c
> 
> then, after that, the program parses the user input and puts it into char
> *UserCommand[10] like this:
> 
> UserCommand[0] = /showfilestats
> UserCommand[1] = math.c
> 
> Then, I can figure the rest out myself :) But as of now, I have no idea how
> to do something like that, I have never programmed a command-driven
> program. Hmm, if it's possible, could you please mail me some sample code?
> I'm an extremely fast visual learner, and I check my mail more often that
> news. Thanks in advance

flex & bison are exactly what you're looking for. You can find
the djgpp ports under v2gnu on your local simtel mirror. 

You'll just have to set up a bunch of rules what a keyword is,
what an identifier, number etc, is.
And then of course a set of rules telling the parser that after
showfilestats _must_ follow a file/path. It'll even yell "syntax
error" when the user breaks the rules ;-)



-- 
Ciao
Tom

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* Thomas Demmer                                             *
* Lehrstuhl fuer Stroemungsmechanik                         *
* Ruhr-Uni-Bochum                                           *
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* D-44780  Bochum                                           *
* Tel: +49 234 700 6434                                     *
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