From:	"Paul Cechner" <paul AT ibc DOT com DOT au DOT NOSPAM>
Newsgroups:	comp.os.msdos.djgpp
References:	<90anr9$ji0$1 AT lacerta DOT tiscalinet DOT it>
Subject:	Re: bison
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Date:	Wed, 6 Dec 2000 08:44:28 +0800
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abacuc <f DOT onorati AT tiscalinet DOT it> wrote in message
news:90anr9$ji0$1 AT lacerta DOT tiscalinet DOT it...
> I read some info for bison and i realize a parser but it's a entire
> program...i want to know if is it possible to realize a function parser
> (e.g. a function that receive a string like input parameter like 2+3-4*12
> and return a double output) that i can use in a my project. Some of you
> knows how to make this and where can i find some examples of this (not
only
> info bison)!
>
> thanks
>
>

check out http://www.gnu.org/software/bison/bison.html for a download page,
and get the manuals at www.gnu.org/manual/bison/index.html

you will probably want flex as well... just search for it at www.gnu.org

small description: flex is a tokeniser, retrieving tokens from some text
stream based on a set of rules you compile into it.  bison is a
parser-generator that calls the generated flex code to retrieve tokens, and
takes branches of action dependant upon the order of the tokens.

these both replacements for the commonly used lex and yacc utilities.

they are both programs, flex (replacement for lex) takes a rule file as
input and generates (c or c++) code tokeniser.  bison (replacement for yacc)
takes this code and a different rules file to generate (c or c++) code
parser.

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----------------------
Paul Cechner

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