106 lines
2.1 KiB
Perl
106 lines
2.1 KiB
Perl
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package URI::urn; # RFC 2141
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use strict;
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use warnings;
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our $VERSION = '1.76';
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use parent 'URI';
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use Carp qw(carp);
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my %implementor;
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my %require_attempted;
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sub _init {
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my $class = shift;
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my $self = $class->SUPER::_init(@_);
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my $nid = $self->nid;
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my $impclass = $implementor{$nid};
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return $impclass->_urn_init($self, $nid) if $impclass;
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$impclass = "URI::urn";
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if ($nid =~ /^[A-Za-z\d][A-Za-z\d\-]*\z/) {
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my $id = $nid;
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# make it a legal perl identifier
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$id =~ s/-/_/g;
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$id = "_$id" if $id =~ /^\d/;
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$impclass = "URI::urn::$id";
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no strict 'refs';
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unless (@{"${impclass}::ISA"}) {
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if (not exists $require_attempted{$impclass}) {
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# Try to load it
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my $_old_error = $@;
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eval "require $impclass";
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die $@ if $@ && $@ !~ /Can\'t locate.*in \@INC/;
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$@ = $_old_error;
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}
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$impclass = "URI::urn" unless @{"${impclass}::ISA"};
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}
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}
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else {
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carp("Illegal namespace identifier '$nid' for URN '$self'") if $^W;
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}
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$implementor{$nid} = $impclass;
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return $impclass->_urn_init($self, $nid);
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}
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sub _urn_init {
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my($class, $self, $nid) = @_;
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bless $self, $class;
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}
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sub _nid {
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my $self = shift;
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my $opaque = $self->opaque;
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if (@_) {
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my $v = $opaque;
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my $new = shift;
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$v =~ s/[^:]*/$new/;
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$self->opaque($v);
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# XXX possible rebless
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}
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$opaque =~ s/:.*//s;
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return $opaque;
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}
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sub nid { # namespace identifier
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my $self = shift;
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my $nid = $self->_nid(@_);
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$nid = lc($nid) if defined($nid);
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return $nid;
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}
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sub nss { # namespace specific string
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my $self = shift;
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my $opaque = $self->opaque;
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if (@_) {
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my $v = $opaque;
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my $new = shift;
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if (defined $new) {
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$v =~ s/(:|\z).*/:$new/;
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}
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else {
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$v =~ s/:.*//s;
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}
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$self->opaque($v);
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}
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return undef unless $opaque =~ s/^[^:]*://;
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return $opaque;
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}
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sub canonical {
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my $self = shift;
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my $nid = $self->_nid;
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my $new = $self->SUPER::canonical;
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return $new if $nid !~ /[A-Z]/ || $nid =~ /%/;
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$new = $new->clone if $new == $self;
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$new->nid(lc($nid));
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return $new;
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}
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1;
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