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# $Id$
package XML::Atom::Util;
use strict;
use XML::Atom;
use vars qw( @EXPORT_OK @ISA );
use Encode;
use Exporter;
@EXPORT_OK = qw( set_ns hack_unicode_entity first nodelist childlist textValue iso2dt encode_xml remove_default_ns create_element );
@ISA = qw( Exporter );
our %NS_MAP = (
'0.3' => 'http://purl.org/atom/ns#',
'1.0' => 'http://www.w3.org/2005/Atom',
);
our %NS_VERSION = reverse %NS_MAP;
sub set_ns {
my $thing = shift;
my($param) = @_;
if (my $ns = delete $param->{Namespace}) {
$thing->{ns} = $ns;
$thing->{version} = $NS_VERSION{$ns};
} else {
my $version = delete $param->{Version} || $XML::Atom::DefaultVersion;
$version = '1.0' if $version == 1;
my $ns = $NS_MAP{$version} or $thing->error("Unknown version: $version");
$thing->{ns} = $ns;
$thing->{version} = $version;
}
}
sub ns_to_version {
my $ns = shift;
$NS_VERSION{$ns};
}
sub hack_unicode_entity {
my $data = shift;
Encode::_utf8_on($data);
$data =~ s/&#x(\w{4});/chr(hex($1))/eg;
Encode::_utf8_off($data) unless $XML::Atom::ForceUnicode;
$data;
}
sub first {
my @nodes = nodelist(@_);
return unless @nodes;
return $nodes[0];
}
sub nodelist {
if (LIBXML) {
return $_[1] ? $_[0]->getElementsByTagNameNS($_[1], $_[2]) :
$_[0]->getElementsByTagName($_[2]);
} else {
my $set = $_[1] ?
$_[0]->find("descendant::*[local-name()='$_[2]' and namespace-uri()='$_[1]']") :
$_[0]->find("descendant::$_[2]");
return unless $set && $set->isa('XML::XPath::NodeSet');
return $set->get_nodelist;
}
}
sub childlist {
if (LIBXML) {
return $_[1] ? $_[0]->getChildrenByTagNameNS($_[1], $_[2]) :
$_[0]->getChildrenByTagName($_[2]);
} else {
my $set = $_[1] ?
$_[0]->find("*[local-name()='$_[2]' and namespace-uri()='$_[1]']") :
$_[0]->find($_[2]);
return unless $set && $set->isa('XML::XPath::NodeSet');
return $set->get_nodelist;
}
}
sub textValue {
my $node = first(@_) or return;
LIBXML ? $node->textContent : $node->string_value;
}
sub iso2dt {
my($iso) = @_;
return unless $iso =~ /^(\d{4})(?:-?(\d{2})(?:-?(\d\d?)(?:T(\d{2}):(\d{2}):(\d{2})(?:\.\d+)?(?:Z|([+-]\d{2}:\d{2}))?)?)?)?/;
my($y, $mo, $d, $h, $m, $s, $zone) =
($1, $2 || 1, $3 || 1, $4 || 0, $5 || 0, $6 || 0, $7);
require DateTime;
my $dt = DateTime->new(
year => $y,
month => $mo,
day => $d,
hour => $h,
minute => $m,
second => $s,
time_zone => 'UTC',
);
if ($zone && $zone ne 'Z') {
my $seconds = DateTime::TimeZone::offset_as_seconds($zone);
$dt->subtract(seconds => $seconds);
}
$dt;
}
my %Map = ('&' => '&', '"' => '"', '<' => '<', '>' => '>',
'\'' => ''');
my $RE = join '|', keys %Map;
sub encode_xml {
my($str) = @_;
$str =~ s!($RE)!$Map{$1}!g;
$str;
}
sub remove_default_ns {
my($node) = @_;
if (ref($node) =~ /Element$/ && $node->nodeName =~ /^default\d*:/) {
my $ns = $node->getNamespace;
if ($ns and my $uri = $ns->getData) {
$node->setNamespace($uri, '');
}
}
for my $n ($node->childNodes) {
remove_default_ns($n);
}
}
sub create_element {
my($ns, $name) = @_;
my($ns_uri, $ns_prefix);
if (ref $ns eq 'XML::Atom::Namespace') {
$ns_uri = $ns->{uri};
$ns_prefix = $ns->{prefix};
} else {
$ns_uri = $ns;
}
my $elem;
if (LIBXML) {
$elem = XML::LibXML::Element->new($name);
$elem->setNamespace($ns_uri, $ns_prefix ? $ns_prefix : ());
} else {
$ns_prefix ||= '#default';
$elem = XML::XPath::Node::Element->new($name);
my $ns = XML::XPath::Node::Namespace->new($ns_prefix => $ns_uri);
$elem->appendNamespace($ns);
}
return $elem;
}
1;
__END__
=head1 NAME
XML::Atom::Util - Utility functions
=head1 SYNOPSIS
use XML::Atom::Util qw( iso2dt );
my $dt = iso2dt($entry->issued);
=head1 USAGE
=head2 iso2dt($iso)
Transforms the ISO-8601 date I<$iso> into a I<DateTime> object and returns
the I<DateTime> object.
=head2 encode_xml($str)
Encodes characters with special meaning in XML into entities and returns
the encoded string.
=head1 AUTHOR & COPYRIGHT
Please see the I<XML::Atom> manpage for author, copyright, and license
information.
=cut
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