106 lines
2.5 KiB
Perl
106 lines
2.5 KiB
Perl
package URI::urn::isbn; # RFC 3187
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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::urn';
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use Carp qw(carp);
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BEGIN {
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require Business::ISBN;
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local $^W = 0; # don't warn about dev versions, perl5.004 style
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warn "Using Business::ISBN version " . Business::ISBN->VERSION .
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" which is deprecated.\nUpgrade to Business::ISBN version 2\n"
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if Business::ISBN->VERSION < 2;
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}
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sub _isbn {
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my $nss = shift;
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$nss = $nss->nss if ref($nss);
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my $isbn = Business::ISBN->new($nss);
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$isbn = undef if $isbn && !$isbn->is_valid;
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return $isbn;
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}
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sub _nss_isbn {
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my $self = shift;
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my $nss = $self->nss(@_);
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my $isbn = _isbn($nss);
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$isbn = $isbn->as_string if $isbn;
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return($nss, $isbn);
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}
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sub isbn {
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my $self = shift;
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my $isbn;
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(undef, $isbn) = $self->_nss_isbn(@_);
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return $isbn;
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}
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sub isbn_publisher_code {
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my $isbn = shift->_isbn || return undef;
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return $isbn->publisher_code;
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}
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BEGIN {
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my $group_method = do {
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local $^W = 0; # don't warn about dev versions, perl5.004 style
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Business::ISBN->VERSION >= 2 ? 'group_code' : 'country_code';
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};
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sub isbn_group_code {
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my $isbn = shift->_isbn || return undef;
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return $isbn->$group_method;
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}
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}
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sub isbn_country_code {
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my $name = (caller(0))[3]; $name =~ s/.*:://;
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carp "$name is DEPRECATED. Use isbn_group_code instead";
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no strict 'refs';
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&isbn_group_code;
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}
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BEGIN {
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my $isbn13_method = do {
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local $^W = 0; # don't warn about dev versions, perl5.004 style
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Business::ISBN->VERSION >= 2 ? 'as_isbn13' : 'as_ean';
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};
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sub isbn13 {
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my $isbn = shift->_isbn || return undef;
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# Business::ISBN 1.x didn't put hyphens in the EAN, and it was just a string
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# Business::ISBN 2.0 doesn't do EAN, but it does ISBN-13 objects
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# and it uses the hyphens, so call as_string with an empty anon array
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# or, adjust the test and features to say that it comes out with hyphens.
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my $thingy = $isbn->$isbn13_method;
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return eval { $thingy->can( 'as_string' ) } ? $thingy->as_string([]) : $thingy;
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}
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}
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sub isbn_as_ean {
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my $name = (caller(0))[3]; $name =~ s/.*:://;
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carp "$name is DEPRECATED. Use isbn13 instead";
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no strict 'refs';
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&isbn13;
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}
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sub canonical {
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my $self = shift;
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my($nss, $isbn) = $self->_nss_isbn;
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my $new = $self->SUPER::canonical;
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return $new unless $nss && $isbn && $nss ne $isbn;
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$new = $new->clone if $new == $self;
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$new->nss($isbn);
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return $new;
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}
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1;
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