Re: [Pyparsing] parsing and extracting tac_plus.conf user data

[Asif I. <va...@gm...>]

On Sun, May 25, 2014 at 1:46 AM, Paul McGuire <pt...@au...> wrote:

> Pyparsing only reports one because you only told it to get one.  Change to:
>
>     result = OneOrMore(expr).parseString(data).asList()
>

I am using expr.scanString(data) instead to make sure only to pickup
user block like user = foo { .. {..} .. }  and not get stuck if sees group
= foo {.. {..} .. }

Here is a sample of how a real tac_plus.conf looks like and I am only
parsing
out the user blocks

Here are some example tac_plus.conf file

https://github.com/mkouhei/tacacs-plus/blob/master/debian/tac_plus.conf

https://github.com/mirek186/BackUp/blob/master/tacProject/tac_plus.conf



> and you'll process the rest of the file too.
>
> Also, you will find your results easier to process if you wrap expr in a
> Group, as in:
>
>     expr = Group(Word(alphas) + '=' + Word(alphanums) +
> Optional(nestedCurlies))
>
> -- Paul
>
>
> -----Original Message-----
> From: Asif Iqbal [mailto:va...@gm...]
> Sent: Sunday, May 25, 2014 12:08 AM
> To: pyp...@li...
> Subject: [Pyparsing] parsing and extracting tac_plus.conf user data
>
> Hi All,
>
> I am trying to use pyparse to extract user data and it only picks up the
> first block.
>
> Any idea what I am doing wrong? I am using python 2.7.6 on ubuntu trusty
>
> #!/usr/bin/python
> import pprint, sys
> #from pyparsing import Word, Literal, Forward, Group, ZeroOrMore, alphas
> from pyparsing import *
>
> f = sys.argv[1]
>
> data = open(f,'r').read()
>
> nestedCurlies = nestedExpr('{','}')
>
> expr = Word(alphas) + '=' + Word(alphanums) + Optional(nestedCurlies)
>
> expr.ignore("#" + restOfLine)
> result = expr.parseString(data).asList()
>
> pprint.pprint(result)
>
> Here is sample data file:
>
> user = aa06591 {
>         pap = PAM
>         login = PAM
>     member = readonly
>
>     ## temporary commands so John can adjust resolver
>     ## uplink speed/duplex on SVCS routers
>
>     cmd = interface {
>         permit "Ethernet"
>         deny .*
>     }
>
>     cmd = speed {
>         permit .*
>     }
>     cmd = duplex {
>         permit .*
>     }
>     cmd = default {
>         permit speed
>         permit duplex
>         deny .*
>     }
>     cmd = write {
>         deny ^erase
>         permit .*
>     }
> }
> user = lukesd {
>         pap = des 11uGIcdXQ6v9E
>         login = file /etc/tacacs-passwd
>         member = readonly
> }
> user = curryc {
>     pap = PAM
>         login = PAM
>         member = implementation
> }
> user = rhodesw {
>         pap = PAM
>         login = PAM
>         member = implementation
> }
> user = aa68442 {
>         pap = PAM
>         login = PAM
>         member = implementation
> }
> user = jdimayu {
>         pap = PAM
>         login = PAM
>     member = readonly
> }
>
>
> Here is the output, and it only displays the first block
>
> ['user',
>  '=',
>  'aa60591',
>  ['pap',
>   '=',
>   'PAM',
>   'login',
>   '=',
>   'PAM',
>   'member',
>   '=',
>   'readonly',
>   'cmd',
>   '=',
>   'interface',
>   ['permit', '"Ethernet"', 'deny', '.*'],
>   'cmd',
>   '=',
>   'speed',
>   ['permit', '.*'],
>   'cmd',
>   '=',
>   'duplex',
>   ['permit', '.*'],
>   'cmd',
>   '=',
>   'default',
>   ['permit', 'speed', 'permit', 'duplex', 'deny', '.*'],
>   'cmd',
>   '=',
>   'write',
>   ['deny', '^erase', 'permit', '.*']]]
>
>
>  --
> Asif Iqbal
> PGP Key: 0xE62693C5 KeyServer: pgp.mit.edu
> A: Because it messes up the order in which people normally read text.
> Q: Why is top-posting such a bad thing?
>
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-- 
Asif Iqbal
PGP Key: 0xE62693C5 KeyServer: pgp.mit.edu
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?