Net/IRC3/Util.pm

package Net::IRC3::Util;
use strict;
use Exporter;
our @ISA = qw/Exporter/;
our @EXPORT_OK =
   qw(mk_msg parse_irc_msg split_prefix prefix_nick
      decode_ctcp prefix_user prefix_host);

=head1 NAME

Net::IRC3::Util - Common utilities that help with IRC protocol handling

=head1 SYNOPSIS

   use Net::IRC3 qw/parse_irc_msg mk_msg/;

   my $msgdata = mk_msg (undef, PRIVMSG 

=head1 FUNCTIONS

These are some utility functions that might come in handy when
handling the IRC protocol.

You can export these with eg.:

   use Net::IRC3 qw/parse_irc_msg/;

=over 4

=item B<parse_irc_msg ($ircline)>

This method parses the C<$ircline>, which is one line of the IRC protocol
without the trailing "\015\012".

It returns a hash which has the following entrys:

=over 4

=item prefix

The message prefix.

=item command

The IRC command.

=item params

The parameters to the IRC command in a array reference,
this includes the trailing parameter (the one after the ':' or
the 14th parameter).

=item trailing

This is set if there was a trailing parameter (the one after the ':' or
the 14th parameter).

=back

=cut

sub parse_irc_msg {
  my ($msg) = @_;

  my $cmd;
  my $pref;
  my $t;
  my @a;

  my $p = $msg =~ s/^(:([^ ]+)[ ])?([A-Za-z]+|\d{3})//;
  $pref = $2;
  $cmd = $3;

  my $i = 0;

  while ($msg =~ s/^[ ]([^ :\015\012\0][^ \015\012\0]*)//) {

    push @a, $1 if defined $1;
    if (++$i > 13) { last; }
  }

  if ($i == 14) {

    if ($msg =~ s/^[ ]:?([^\015\012\0]*)//) {
      $t = $1 if $1 ne "";
    }

  } else {

    if ($msg =~ s/^[ ]:([^\015\012\0]*)//) {
      $t = $1 if $1 ne "";
    }
  }

  push @a, $t if defined $t;

  my $m = { prefix => $pref, command => $cmd, params => \@a, trailing => $t };
  return $p ? $m : undef;
}

=item B<mk_msg ($prefix, $command, $trailing, @params)>

This function assembles a IRC message. The generated
message will look like (pseudo code!)

   :<prefix> <command> <params> :<trail>

Please refer to RFC 2812 how IRC messages normally look like.

The prefix and the trailing string will be omitted if they are C<undef>.

EXAMPLES:

   mk_msg (undef, "PRIVMSG", "you suck!", "magnus");
   # will return: "PRIVMSG magnus :you suck!\015\012"

   mk_msg (undef, "JOIN", undef, "#test");
   # will return: "JOIN #test\015\012"

=cut

sub mk_msg {
  my ($prefix, $command, $trail, @params) = @_;
  my $msg = "";

  $msg .= defined $prefix ? ":$prefix " : "";
  $msg .= "$command";

  # FIXME: params must be counted, and if > 13 they have to be
  # concationated with $trail
  map { $msg .= " $_" } @params;

  $msg .= defined $trail ? " :$trail" : "";
  $msg .= "\015\012";

  return $msg;
}


=item B<decode_ctcp ($ircmsg)> or B<decode_ctcp ($line)>

=cut

sub decode_ctcp {
   my ($self, $msg) = @_;
   my $line = ref $msg ? $msg->{trailing} : $msg;
   my $msg = ref $msg ? $msg : { };

   if ($line =~ m/^\001(.*?)\001$/) {
      my $ctcpdata = $1;

      # XXX: implement!

   } else {
      return { trailing => $line };
   }


   return $msg;
}

=item B<split_prefix ($prefix)>

This function splits an IRC user prefix as described by RFC 2817
into the three parts: nickname, user and host. Which will be
returned as a list with that order.

C<$prefix> can also be a hash like it is returned by C<parse_irc_msg>.

=cut

sub split_prefix {
   my ($prfx) = @_;

   if (ref ($prfx) eq 'HASH') {
      $prfx = $prfx->{prefix};
   }

   $prfx =~ m/^\s*([^!]*)!([^@]*)@(.*?)\s*$/;
   return ($1, $2, $3);
}

=item B<prefix_nick ($prefix)>

A shortcut to extract the nickname from the C<$prefix>.

C<$prefix> can also be a hash like it is returned by C<parse_irc_msg>.

=cut

sub prefix_nick {
   my ($prfx) = @_;
   return (split_prefix ($prfx))[0];
}

=item B<prefix_user ($prefix)>

A shortcut to extract the username from the C<$prefix>.

C<$prefix> can also be a hash like it is returned by C<parse_irc_msg>.

=cut

sub prefix_user {
   my ($prfx) = @_;
   return (split_prefix ($prfx))[1];
}

=item B<prefix_host ($prefix)>

A shortcut to extract the hostname from the C<$prefix>.

C<$prefix> can also be a hash like it is returned by C<parse_irc_msg>.

=cut

sub prefix_host {
   my ($self, $prfx) = @_;
   return (split_prefix ($prfx))[2];
}

=back

=head1 AUTHOR

Robin Redeker, C<< <elmex@ta-sa.org> >>

=head1 SEE ALSO

RFC 2812 - Internet Relay Chat: Client Protocol

=head1 COPYRIGHT & LICENSE

Copyright 2006 Robin Redeker, all rights reserved.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

=cut

1;
Revision:	1.5
Committed:	Mon Jul 17 18:44:08 2006 UTC (19 years, 7 months ago) by elmex
Branch:	MAIN
Changes since 1.4:	+1 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	elmex	1.1	package Net::IRC3::Util;
2			use strict;
3			use Exporter;
4			our @ISA = qw/Exporter/;
5			our @EXPORT_OK =
6			qw(mk_msg parse_irc_msg split_prefix prefix_nick
7			decode_ctcp prefix_user prefix_host);
8
9			=head1 NAME
10
11			Net::IRC3::Util - Common utilities that help with IRC protocol handling
12
13	elmex	1.2	=head1 SYNOPSIS
14
15			use Net::IRC3 qw/parse_irc_msg mk_msg/;
16
17			my $msgdata = mk_msg (undef, PRIVMSG
18
19	elmex	1.1	=head1 FUNCTIONS
20
21			These are some utility functions that might come in handy when
22			handling the IRC protocol.
23
24			You can export these with eg.:
25
26			use Net::IRC3 qw/parse_irc_msg/;
27
28			=over 4
29
30			=item B<parse_irc_msg ($ircline)>
31
32			This method parses the C<$ircline>, which is one line of the IRC protocol
33			without the trailing "\015\012".
34
35			It returns a hash which has the following entrys:
36
37			=over 4
38
39			=item prefix
40
41			The message prefix.
42
43			=item command
44
45			The IRC command.
46
47			=item params
48
49			The parameters to the IRC command in a array reference,
50			this includes the trailing parameter (the one after the ':' or
51			the 14th parameter).
52
53			=item trailing
54
55			This is set if there was a trailing parameter (the one after the ':' or
56			the 14th parameter).
57
58			=back
59
60			=cut
61
62			sub parse_irc_msg {
63			my ($msg) = @_;
64
65			my $cmd;
66			my $pref;
67			my $t;
68			my @a;
69
70			my $p = $msg =~ s/^(:([^ ]+)[ ])?([A-Za-z]+\|\d{3})//;
71			$pref = $2;
72			$cmd = $3;
73
74			my $i = 0;
75
76			while ($msg =~ s/^[ ]([^ :\015\012\0][^ \015\012\0]*)//) {
77
78			push @a, $1 if defined $1;
79			if (++$i > 13) { last; }
80			}
81
82			if ($i == 14) {
83
84			if ($msg =~ s/^[ ]:?([^\015\012\0]*)//) {
85			$t = $1 if $1 ne "";
86			}
87
88			} else {
89
90			if ($msg =~ s/^[ ]:([^\015\012\0]*)//) {
91			$t = $1 if $1 ne "";
92			}
93			}
94
95			push @a, $t if defined $t;
96
97			my $m = { prefix => $pref, command => $cmd, params => \@a, trailing => $t };
98			return $p ? $m : undef;
99			}
100
101			=item B<mk_msg ($prefix, $command, $trailing, @params)>
102
103			This function assembles a IRC message. The generated
104			message will look like (pseudo code!)
105
106			:<prefix> <command> <params> :<trail>
107
108			Please refer to RFC 2812 how IRC messages normally look like.
109
110			The prefix and the trailing string will be omitted if they are C<undef>.
111
112			EXAMPLES:
113
114			mk_msg (undef, "PRIVMSG", "you suck!", "magnus");
115			# will return: "PRIVMSG magnus :you suck!\015\012"
116
117			mk_msg (undef, "JOIN", undef, "#test");
118	elmex	1.5	# will return: "JOIN #test\015\012"
119	elmex	1.1
120			=cut
121
122			sub mk_msg {
123			my ($prefix, $command, $trail, @params) = @_;
124			my $msg = "";
125
126			$msg .= defined $prefix ? ":$prefix " : "";
127			$msg .= "$command";
128
129			# FIXME: params must be counted, and if > 13 they have to be
130			# concationated with $trail
131			map { $msg .= " $_" } @params;
132
133			$msg .= defined $trail ? " :$trail" : "";
134			$msg .= "\015\012";
135
136			return $msg;
137			}
138
139
140			=item B<decode_ctcp ($ircmsg)> or B<decode_ctcp ($line)>
141
142			=cut
143
144			sub decode_ctcp {
145			my ($self, $msg) = @_;
146			my $line = ref $msg ? $msg->{trailing} : $msg;
147			my $msg = ref $msg ? $msg : { };
148
149			if ($line =~ m/^\001(.*?)\001$/) {
150			my $ctcpdata = $1;
151
152			# XXX: implement!
153
154			} else {
155			return { trailing => $line };
156			}
157
158
159			return $msg;
160			}
161
162			=item B<split_prefix ($prefix)>
163
164			This function splits an IRC user prefix as described by RFC 2817
165			into the three parts: nickname, user and host. Which will be
166			returned as a list with that order.
167
168			C<$prefix> can also be a hash like it is returned by C<parse_irc_msg>.
169
170			=cut
171
172			sub split_prefix {
173			my ($prfx) = @_;
174
175			if (ref ($prfx) eq 'HASH') {
176			$prfx = $prfx->{prefix};
177			}
178
179			$prfx =~ m/^\s([^!])!([^@])@(.?)\s*$/;
180			return ($1, $2, $3);
181			}
182
183			=item B<prefix_nick ($prefix)>
184
185			A shortcut to extract the nickname from the C<$prefix>.
186
187			C<$prefix> can also be a hash like it is returned by C<parse_irc_msg>.
188
189			=cut
190
191			sub prefix_nick {
192			my ($prfx) = @_;
193			return (split_prefix ($prfx))[0];
194			}
195
196			=item B<prefix_user ($prefix)>
197
198			A shortcut to extract the username from the C<$prefix>.
199
200			C<$prefix> can also be a hash like it is returned by C<parse_irc_msg>.
201
202			=cut
203
204			sub prefix_user {
205			my ($prfx) = @_;
206			return (split_prefix ($prfx))[1];
207			}
208
209			=item B<prefix_host ($prefix)>
210
211			A shortcut to extract the hostname from the C<$prefix>.
212
213			C<$prefix> can also be a hash like it is returned by C<parse_irc_msg>.
214
215			=cut
216
217			sub prefix_host {
218			my ($self, $prfx) = @_;
219			return (split_prefix ($prfx))[2];
220			}
221
222			=back
223
224			=head1 AUTHOR
225
226			Robin Redeker, C<< <elmex@ta-sa.org> >>
227
228			=head1 SEE ALSO
229
230			RFC 2812 - Internet Relay Chat: Client Protocol
231
232			=head1 COPYRIGHT & LICENSE
233
234	elmex	1.3	Copyright 2006 Robin Redeker, all rights reserved.
235	elmex	1.1
236			This program is free software; you can redistribute it and/or modify it
237			under the same terms as Perl itself.
238
239			=cut
240
241			1;