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isbn.pm
package URI::urn::isbn; # RFC 3187 use strict; use warnings; our $VERSION = '1.73'; use parent 'URI::urn'; use Carp qw(carp); BEGIN { require Business::ISBN; local $^W = 0; # don't warn about dev versions, perl5.004 style warn "Using Business::ISBN version " . Business::ISBN->VERSION . " which is deprecated.\nUpgrade to Business::ISBN version 2\n" if Business::ISBN->VERSION < 2; } sub _isbn { my $nss = shift; $nss = $nss->nss if ref($nss); my $isbn = Business::ISBN->new($nss); $isbn = undef if $isbn && !$isbn->is_valid; return $isbn; } sub _nss_isbn { my $self = shift; my $nss = $self->nss(@_); my $isbn = _isbn($nss); $isbn = $isbn->as_string if $isbn; return($nss, $isbn); } sub isbn { my $self = shift; my $isbn; (undef, $isbn) = $self->_nss_isbn(@_); return $isbn; } sub isbn_publisher_code { my $isbn = shift->_isbn || return undef; return $isbn->publisher_code; } BEGIN { my $group_method = do { local $^W = 0; # don't warn about dev versions, perl5.004 style Business::ISBN->VERSION >= 2 ? 'group_code' : 'country_code'; }; sub isbn_group_code { my $isbn = shift->_isbn || return undef; return $isbn->$group_method; } } sub isbn_country_code { my $name = (caller(0))[3]; $name =~ s/.*:://; carp "$name is DEPRECATED. Use isbn_group_code instead"; no strict 'refs'; &isbn_group_code; } BEGIN { my $isbn13_method = do { local $^W = 0; # don't warn about dev versions, perl5.004 style Business::ISBN->VERSION >= 2 ? 'as_isbn13' : 'as_ean'; }; sub isbn13 { my $isbn = shift->_isbn || return undef; # Business::ISBN 1.x didn't put hyphens in the EAN, and it was just a string # Business::ISBN 2.0 doesn't do EAN, but it does ISBN-13 objects # and it uses the hyphens, so call as_string with an empty anon array # or, adjust the test and features to say that it comes out with hyphens. my $thingy = $isbn->$isbn13_method; return eval { $thingy->can( 'as_string' ) } ? $thingy->as_string([]) : $thingy; } } sub isbn_as_ean { my $name = (caller(0))[3]; $name =~ s/.*:://; carp "$name is DEPRECATED. Use isbn13 instead"; no strict 'refs'; &isbn13; } sub canonical { my $self = shift; my($nss, $isbn) = $self->_nss_isbn; my $new = $self->SUPER::canonical; return $new unless $nss && $isbn && $nss ne $isbn; $new = $new->clone if $new == $self; $new->nss($isbn); return $new; } 1;