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package Net::XMPP2::Parser; |
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use warnings; |
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use strict; |
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# OMFG!!!111 THANK YOU FOR THIS MODULE TO HANDLE THE XMPP INSANITY: |
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use Net::XMPP2::Node; |
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use XML::Parser::Expat; |
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|
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=head1 NAME |
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|
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Net::XMPP2::Parser - Parser for XML streams (helper for Net::XMPP2) |
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|
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=head1 SYNOPSIS |
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|
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use Net::XMPP2::Parser; |
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... |
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|
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=head1 DESCRIPTION |
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|
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This is a XMPP XML parser helper class, which helps me to cope with the XMPP XML. |
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|
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See also L<Net::XMPP2::Writer> for a discussion of the issues with XML in XMPP. |
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|
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=head1 METHODS |
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|
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=over 4 |
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|
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=item B<new> |
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|
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This creates a new Net::XMPP2::Parser and calls C<init>. |
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|
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=cut |
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|
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sub new { |
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my $this = shift; |
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my $class = ref($this) || $this; |
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my $self = { |
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stanza_cb => sub { die "No stanza callback provided!" }, |
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error_cb => sub { warn "No error callback provided: $_[0]: $_[1]!" }, |
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@_ |
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}; |
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bless $self, $class; |
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$self->init; |
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$self |
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} |
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|
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=item B<set_stanza_cb ($cb)> |
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|
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Sets the 'XML stanza' callback. |
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|
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C<$cb> must be a code reference. The first argument to |
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the callback will be this Net::XMPP2::Parser instance and |
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the second will be the stanzas root Net::XMPP2::Node as first argument. |
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|
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If the second argument is undefined the end of the stream has been found. |
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|
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=cut |
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|
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sub set_stanza_cb { |
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my ($self, $cb) = @_; |
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$self->{stanza_cb} = $cb; |
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} |
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|
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=item B<set_error_cb ($cb)> |
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|
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This sets the error callback that will be called when |
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the parser encounters an syntax error. The first argument |
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is the exception and the second is the data which caused the error. |
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|
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=cut |
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|
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sub set_error_cb { |
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my ($self, $cb) = @_; |
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$self->{error_cb} = $cb; |
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} |
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|
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=item B<init> |
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|
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This methods (re)initializes the parser. |
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|
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=cut |
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|
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sub init { |
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my ($self) = @_; |
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$self->{parser} = XML::Parser::ExpatNB->new ( |
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Namespaces => 1, |
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ProtocolEncoding => 'UTF-8' |
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); |
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$self->{parser}->setHandlers ( |
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Start => sub { $self->cb_start_tag (@_) }, |
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End => sub { $self->cb_end_tag (@_) }, |
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Char => sub { $self->cb_char_data (@_) }, |
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); |
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$self->{nso} = {}; |
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$self->{nodestack} = []; |
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} |
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|
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=item B<nseq ($namespace, $tagname, $cmptag)> |
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|
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This method checks whether the C<$cmptag> matches the C<$tagname> |
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in the C<$namespace>. |
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|
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C<$cmptag> needs to come from the XML::Parser::Expat as it has |
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some magic attached that stores the namespace. |
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|
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=cut |
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|
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sub nseq { |
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my ($self, $ns, $name, $tag) = @_; |
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|
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unless (exists $self->{nso}->{$ns}->{$name}) { |
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$self->{nso}->{$ns}->{$name} = |
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$self->{parser}->generate_ns_name ($name, $ns); |
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} |
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|
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return $self->{parser}->eq_name ($self->{nso}->{$ns}->{$name}, $tag); |
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} |
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|
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=item B<feed ($data)> |
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|
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This method feeds a chunk of unparsed data to the parser. |
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|
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=cut |
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|
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sub feed { |
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my ($self, $data) = @_; |
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eval { |
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$self->{parser}->parse_more ($data); |
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}; |
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if ($@) { |
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$self->{error_cb}->($@, $data, 'xml'); |
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} |
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} |
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|
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|
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sub cb_start_tag { |
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my ($self, $p, $el, %attrs) = @_; |
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push @{$self->{nodestack}}, Net::XMPP2::Node->new ($p->namespace ($el), $el, \%attrs, $self); |
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} |
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|
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sub cb_char_data { |
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my ($self, $p, $str) = @_; |
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unless (@{$self->{nodestack}}) { |
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warn "characters outside of tag: [$str]!\n"; |
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return; |
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} |
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$self->{nodestack}->[-1]->add_text ($str); |
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} |
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|
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sub cb_end_tag { |
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my ($self, $p, $el) = @_; |
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|
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unless (@{$self->{nodestack}}) { |
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warn "end tag </$el> read without any starting tag!\n"; |
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return; |
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} |
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|
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if (!$p->eq_name ($self->{nodestack}->[-1]->name, $el)) { |
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warn "end tag </$el> doesn't match start tags ($self->{tags}->[-1]->[0])!\n"; |
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return; |
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} |
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|
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my $node = pop @{$self->{nodestack}}; |
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|
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# > 1 because we don't want the stream tag to save all our children... |
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if (@{$self->{nodestack}} > 1) { |
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$self->{nodestack}->[-1]->add_node ($node); |
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} |
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|
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eval { |
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if (@{$self->{nodestack}} == 1) { |
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$self->{stanza_cb}->($self, $node); |
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} elsif (@{$self->{nodestack}} == 0) { |
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$self->{stanza_cb}->($self, undef); |
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} |
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}; |
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if ($@) { |
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$self->{error_cb}->($@, undef, 'exception'); |
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} |
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} |
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|
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=back |
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|
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=head1 AUTHOR |
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|
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Robin Redeker, C<< <elmex at ta-sa.org> >>, JID: C<< <elmex at jabber.org> >> |
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|
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=head1 COPYRIGHT & LICENSE |
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|
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Copyright 2007 Robin Redeker, all rights reserved. |
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|
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This program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |
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|
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=cut |
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|
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1; # End of Net::XMPP2 |
