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package XML::Atom::Filter; |
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use warnings; |
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use strict; |
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=head1 NAME |
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XML::Atom::Filter - easy creation of command line Atom processing tools |
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=head1 VERSION |
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Version 0.06 |
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=cut |
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our $VERSION = '0.07'; |
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=head1 SYNOPSIS |
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package Uppercaser; |
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use XML::Atom::Filter; |
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use base qw( XML::Atom::Filter ); |
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sub entry { |
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my ($class, $e) = @_; |
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$e->content(uc $e->content); |
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} |
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package main; |
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Uppercaser->filter; |
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=head1 DESCRIPTION |
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C supports creation of command line tools to filter and |
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process Atom feeds. |
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=head1 USAGE |
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=cut |
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package XML::Atom::Filter; |
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use XML::Atom; |
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use XML::Atom::Feed; |
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=head2 XML::Atom::Filter->new() |
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Creates an instance of the identity filter. C can be used as |
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a class or an instance. |
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=cut |
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sub new { |
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my $class = shift; |
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return bless {}, $class; |
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} |
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=head2 $f->filter([ $fh ]) |
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Reads an Atom feed document and applies the filtering process to it. The Atom |
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feed is read from C<$fh>, or C if not given. After the feed is read and |
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parsed, it will be run through the C, C (entry by entry), and |
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C methods. |
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=cut |
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sub filter { |
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my ($self, $fh) = @_; |
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my $feed = XML::Atom::Feed->new($fh || \*STDIN) |
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or die XML::Atom::Feed->errstr; |
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$self->pre($feed); |
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my @entries = $feed->entries; |
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@entries = grep { $_ } map { $self->entry($_) } @entries; |
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## Remove existing entries so we can add back the processed ones without duplication. |
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my @entryNodes; |
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if(*XML::Atom::LIBXML) { |
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@entryNodes = $feed->elem->getElementsByTagNameNS($feed->ns, 'entry') or return; |
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} else { |
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for my $el ($feed->elem->getDocumentElement->childNodes) { |
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push @entryNodes, $el if $el->getName eq 'entry'; |
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}; |
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} |
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$_->parentNode->removeChild($_) for @entryNodes; |
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$feed->add_entry($_) for @entries; |
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$self->post($feed); |
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} |
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=head2 $f->pre($feed) |
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Prepares to process the entries of the feed, an C object. By |
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default, no operation is performed. |
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=cut |
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sub pre { 1; } |
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=head2 $f->entry($entry) |
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Processes an entry of the feed, an C object. Returns the new |
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or modified entry reference, or C if the entry should be removed from |
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the filtered feed. By default, no change is made. |
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If your filter modifies the content of the entry, you B also modify the |
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entry's C. The Atom feed specification requires entries' C fields to be |
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universally unique. |
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111
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=cut |
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sub entry { $_[1]; } |
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=head2 $f->post($feed) |
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Postprocesses the feed, an C object, after the entries are |
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individually processed. By default, the feed's XML is printed to C. |
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=cut |
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sub post { print STDOUT $_[1]->as_xml; } |
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=head1 AUTHOR |
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Mark Paschal, C<< >> |
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=head1 BUGS |
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Please report any bugs or feature requests to |
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C, or through the web interface at |
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L. |
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I will be notified, and then you'll automatically be notified of progress on |
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your bug as I make changes. |
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=head1 COPYRIGHT & LICENSE |
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Copyright 2005-2006 Mark Paschal, All Rights Reserved. |
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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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=cut |
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1; # End of XML::Atom::Filter |
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