diff options
Diffstat (limited to 'Master/tlpkg/tlperl/lib/URI/urn.pm')
-rw-r--r-- | Master/tlpkg/tlperl/lib/URI/urn.pm | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/Master/tlpkg/tlperl/lib/URI/urn.pm b/Master/tlpkg/tlperl/lib/URI/urn.pm new file mode 100644 index 00000000000..12d40b265bc --- /dev/null +++ b/Master/tlpkg/tlperl/lib/URI/urn.pm @@ -0,0 +1,97 @@ +package URI::urn; # RFC 2141 + +require URI; +@ISA=qw(URI); + +use strict; +use Carp qw(carp); + +use vars qw(%implementor); + +sub _init { + my $class = shift; + my $self = $class->SUPER::_init(@_); + my $nid = $self->nid; + + my $impclass = $implementor{$nid}; + return $impclass->_urn_init($self, $nid) if $impclass; + + $impclass = "URI::urn"; + if ($nid =~ /^[A-Za-z\d][A-Za-z\d\-]*\z/) { + my $id = $nid; + # make it a legal perl identifier + $id =~ s/-/_/g; + $id = "_$id" if $id =~ /^\d/; + + $impclass = "URI::urn::$id"; + no strict 'refs'; + unless (@{"${impclass}::ISA"}) { + # Try to load it + eval "require $impclass"; + die $@ if $@ && $@ !~ /Can\'t locate.*in \@INC/; + $impclass = "URI::urn" unless @{"${impclass}::ISA"}; + } + } + else { + carp("Illegal namespace identifier '$nid' for URN '$self'") if $^W; + } + $implementor{$nid} = $impclass; + + return $impclass->_urn_init($self, $nid); +} + +sub _urn_init { + my($class, $self, $nid) = @_; + bless $self, $class; +} + +sub _nid { + my $self = shift; + my $opaque = $self->opaque; + if (@_) { + my $v = $opaque; + my $new = shift; + $v =~ s/[^:]*/$new/; + $self->opaque($v); + # XXX possible rebless + } + $opaque =~ s/:.*//s; + return $opaque; +} + +sub nid { # namespace identifier + my $self = shift; + my $nid = $self->_nid(@_); + $nid = lc($nid) if defined($nid); + return $nid; +} + +sub nss { # namespace specific string + my $self = shift; + my $opaque = $self->opaque; + if (@_) { + my $v = $opaque; + my $new = shift; + if (defined $new) { + $v =~ s/(:|\z).*/:$new/; + } + else { + $v =~ s/:.*//s; + } + $self->opaque($v); + } + return undef unless $opaque =~ s/^[^:]*://; + return $opaque; +} + +sub canonical { + my $self = shift; + my $nid = $self->_nid; + my $new = $self->SUPER::canonical; + return $new if $nid !~ /[A-Z]/ || $nid =~ /%/; + $new = $new->clone if $new == $self; + $new->nid(lc($nid)); + return $new; +} + +1; |