# Grammar file to parse Cisco CDP information
# show cdp neighbor detail
#
# Copyright (c) 2010  Tomas Zeman <tzeman@volny.cz>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted providing that the following conditions 
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#

{ # perl code follows

$::res = {};
$::res->{cdp} = ();
$::cur_cdp = {};
my $seen_neighbor = 0;

sub init_cur_cdp() {
	$::cur_cdp = {
		'neighbor' => '',
		'ip' => [],
		lport => '',
		rport => '',
	};
}

sub push_cur_cdp() {
	push @{$::res->{cdp}}, $::cur_cdp if ($seen_neighbor);
	$seen_neighbor = 0;
}

}

file:		<skip: qr/[^\S\n]*/>	# Ignore non-newline whitespace
		line(s) eofile

line:		neighbor_line
		| entry_address
		| neighbor_port
		| word(s) eol
		| word(s) eofile
		| emptyline
		| <error>

emptyline:	eol

word:		/\S+/  # any non-space
		{ $item[1] }

eofile:		/^\Z/
		{ push_cur_cdp; }

eol:		/\n/

identifier:	/[0-9a-zA-Z:_\.-]+/
		{ $item[1] }

ip:		/\d+\.\d+\.\d+\.\d+/
		{ $item[1] }

iface_name:	/\w+(-\w+)?( )?\d+[0-9\/\.:]*/
		{ $item[1] }

neighbor_line:	"Device ID:" identifier eol
		{
		push_cur_cdp;
		init_cur_cdp;
		$::cur_cdp->{'neighbor'} = $item{identifier};
		$seen_neighbor = 1;
		}

neighbor_port:	"Interface:" iface_name"," "Port ID (outgoing port):" iface_name eol
		{
		$::cur_cdp->{lport} = $item[2];
		$::cur_cdp->{rport} = $item[5];
		}

entry_address: "Entry address(es):" eol entry_ip_address(s)

entry_ip_address: "IP address:" ip eol
		{ push @{$::cur_cdp->{ip}}, $item{ip}; }