RE: [HACKERS] [OT] flex, yacc, and bison

On 18-Aug-99 Jackson, DeJuan wrote:
> I'm trying to write a ncftp_auth deamon that will utilize PostgreSQL.  The
> base SDK is in C.  I'm adapting it to C++ because I feel like it, but Perl
> would be a slightly steeper learning curve (sockets and all that).  I'm
> trying to get a conf file parser such that the login's can be in multiple
> database and/or on different machines.

If you're into C/C++ (like I am), it's almost trivial to parse that into
individual strings.  I was under the impression from your first note that
C/C++ wasn't an option.   At the minimum, think strtok().   There's also
strsep() but it's not been one of my favorites.  If you still need actual
code let me know and I can send you something.

Vince.




>       DEJ
> 
>> -----Original Message-----
>> From:        Michael Alan Dorman [SMTP:mdorman-pgsql.hackers@debian.org]
>> Sent:        Wednesday, August 18, 1999 4:46 PM
>> To:  pgsql-hackers@postgreSQL.org
>> Subject:     Re: [HACKERS] [OT] flex, yacc, and bison
>> 
>> Tom Lane <tgl@sss.pgh.pa.us> writes:
>> > "Jackson, DeJuan" <djackson@cpsgroup.com> writes:
>> > > I need to parse this format:
>> > > <Database ftpdatabase [hostname[:port]]>
>> > >  [<DatabaseID somebody>]
>> > >  [<DatabasePWD mypwd>]
>> > >  [<Table ftp_users>
>> > >   [<Uname uname>]
>> > >   [<CryptedPwd cryptedpwd>]
>> > >   [<FtpPath ftppath>]
>> > >  </Table>]
>> > > </Database>
>> > 
>> > That looks suspiciously like an SGML DTD to me...
>> 
>> Well, it could almost kind of be SGML, but as specified, there's no
>> way it could possibly be XML (attributes have to have values, a couple
>> of other things), which is unfortunate, since that's where all the
>> cool tools are being developed these days.
>> 
>> > Rather than doing the whole lex/yacc bit, I'd suggest finding some
>> > ready-made SGML-parsing tools.  For instance, if you are handy with
>> > Perl I think there are some SGML modules in CPAN ... certainly there
>> > are HTML parsers, which'd probably be easy to adapt to the purpose.
>> 
>> I agree with Tom that you try to find existing parsers tuned towards
>> this stuff, with the addition that you do your self a favor (if you
>> have the option to change the format), and change it to be something
>> that can be parsed as XML.
>> 
>> You don't mention what this is for, but if you're able to move to XML,
>> you can use Perl (which I personally prefer), Python, TCL, or even one
>> of several C libraries (expat or rxp or GNOME's libxml) that are
>> suprisingly easy to use, given that text hacking is not something that
>> is traditionally easy to do in C.  The possibilities are much broader.
>> 
>> Mike.
>> 
>> ************
>> Check out "PostgreSQL Wearables" @ http://www.pgsql.com
> 
> ************
> Check out "PostgreSQL Wearables" @ http://www.pgsql.com
> 

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