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HideShow 11 lines of Pod
=pod
=head1 NAME
URI::NamespaceMap - Class holding a collection of namespaces
=head1 VERSION
Version 1.12
=cut
package URI::NamespaceMap;
use Moo 1.006000;
use Module::Load::Conditional qw[can_load];
use URI::Namespace;
use Carp;
use Scalar::Util qw( blessed );
use Sub::Quote qw( quote_sub );
use Try::Tiny;
use Types::Standard qw(HashRef);
use Types::Namespace 0.004 qw(Namespace);
use URI::NamespaceMap::ReservedLocalParts;
use namespace::autoclean;
our $VERSION = '1.12';
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=head1 SYNOPSIS
  use URI::NamespaceMap;
  my $map = URI::NamespaceMap->new( { xsd => 'http://www.w3.org/2001/XMLSchema#' } );
  $map->namespace_uri('xsd')->as_string;
  my $foaf = URI::Namespace->new( 'http://xmlns.com/foaf/0.1/' );
  $map->add_mapping(foaf => $foaf);
  $map->add_mapping(rdf => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#' );
  $map->list_prefixes;  #  ( 'foaf', 'rdf', 'xsd' )
  $map->foaf; # Returns URI::Namespace object
  while (my ($prefix, $nsURI) = $map->each_map) {
         $node->setNamespace($nsURI->as_string, $prefix); # For use with XML::LibXML
  }
=head1 DESCRIPTION
This module provides an object to manage multiple namespaces for creating L<URI::Namespace> objects and for serializing.
=head1 METHODS
=over
=item C<< new ( [ \%namespaces | @prefixes | @uris ] ) >>
Returns a new namespace map object. You can pass a hash reference with
mappings from local names to namespace URIs (given as string or
L<RDF::Trine::Node::Resource>) or namespaces_map with a hashref. 
You may also pass an arrayref containing just prefixes and/or
namespace URIs, and the module will try to guess the missing part. To
use this feature, you need L<RDF::NS::Curated>, L<RDF::NS>,
L<XML::CommonNS> or L<RDF::Prefixes>, or preferably all of them. With
that, you can do e.g.
  my $map = URI::NamespaceMap->new( 'rdf', 'xsd', 'foaf' );
and have the correct mappings added automatically.
=item C<< add_mapping ( $name => $uri ) >>
Adds a new namespace to the map. The namespace URI can be passed
as string or a L<URI::Namespace> object.
=item C<< remove_mapping ( $name ) >>
Removes a namespace from the map given a prefix.
=item C<< namespace_uri ( $name ) >>
Returns the L<URI::Namespace> object (if any) associated with the given prefix.
=item C<< $name >>
This module creates a method for all the prefixes, so you can say e.g.
  $map->foaf
and get a L<URI::Namespace> object for the FOAF namespace. Since
L<URI::Namespace> does the same for local names, you can then say e.g.
  $map->foaf->name
to get a full L<URI>.
=item C<< list_namespaces >>
Returns an array of L<URI::Namespace> objects with all the namespaces.
=item C<< list_prefixes >>
Returns an array of prefixes.
=item C<< each_map >>
Returns an 2-element list where the first element is a prefix and the
second is the corresponding L<URI::Namespace> object.
=cut
around BUILDARGS => sub {
        my ($next, $self, @parameters) = @_;
        if (ref($parameters[0]) eq 'ARRAY') {
                return { namespace_map => $self->_guess(@{$parameters[0]}) };
        }
        if (@parameters == 1 && (! exists $parameters[0]->{namespace_map})) {
                return { namespace_map => $parameters[0] } 
        } else { $self->$next(@parameters) }
};
sub BUILD {
    my ($self, $args) = @_;
    my $r = URI::NamespaceMap::ReservedLocalParts->new(disallowed => [qw/uri/]);
    for my $local_part (keys %{$args->{namespace_map}}) {
        Carp::croak("$_[1] prohibited as local part")
            if $r->is_reserved($local_part);
    }
}
has namespace_map => (
                      is => "ro",
                      isa => HashRef[Namespace],
                      coerce => 1,
                      default => quote_sub q { {} },
                     );
sub add_mapping {
        my $r = URI::NamespaceMap::ReservedLocalParts->new(disallowed => [qw/uri/]);
        Carp::croak("$_[1] prohibited as local part") if $r->is_reserved($_[1]);
        $_[0]->namespace_map->{$_[1]} = Namespace->assert_coerce($_[2])
}
sub remove_mapping  { delete $_[0]->namespace_map->{$_[1]} }
sub namespace_uri   { $_[0]->namespace_map->{$_[1]} }
sub list_namespaces { values %{ $_[0]->namespace_map } }
sub list_prefixes   { keys   %{ $_[0]->namespace_map } }
sub each_map        { each   %{ $_[0]->namespace_map } }
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=item C<< guess_and_add ( @string_or_uri ) >>
Like in the constructor, an array of strings can be given, and the
module will attempt to guess appropriate mappings, and add them to the
map.
=cut
sub guess_and_add {
        my ($self, @data) = @_;
        my $guessed = $self->_guess(@data);
        while (my ($name, $uri) = each %{$guessed}) {
                $self->add_mapping($name => $uri);
        }
}
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=item C<< uri ( $prefixed_name ) >>
Returns a URI for an abbreviated string such as 'foaf:Person'.
=cut
sub uri {
        my $self = shift;
        my $abbr = shift;
        my $ns;
        my $local = "";
        if ($abbr =~ m/^([^:]*):(.*)$/) {
                $ns = $self->namespace_uri( $1 );
                $local = $2;
        } else {
                $ns = $self->{ $abbr };
        }
        return unless (blessed($ns));
        if ($local ne '') {
                return $ns->uri($local);
        } else {
                return URI->new($ns->as_string);
        }
}
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=item prefix_for C<< uri ($uri) >>
Returns the associated prefix (or potentially multiple prefixes, when
called in list context) for the given URI.
=cut
# turn the URI back into a string to mitigate unexpected behaviour
sub _scrub_uri {
        my $uri = shift;
        if (ref $uri) {
                if (blessed $uri) {
                        if ($uri->isa('URI::Namespace')) {
                                $uri = $uri->as_string;
                        }
                        elsif ($uri->isa('IRI')) {
                                $uri = $uri->as_string;
                        }
                        elsif ($uri->isa('URI')) {
                                # it's probably not necessary to do this, but whatever
                                $uri = $uri->as_string;
                        }
                        elsif ($uri->isa('RDF::Trine::Node')) {
                                # it is, on the other hand, necessary to do this.
                                $uri = $uri->uri_value;
                        }
                        elsif ($uri->isa('RDF::Trine::Namespace')) {
                                # and this
                                $uri = $uri->uri->uri_value;
                        }
#                       elsif ($uri =~ m/^\<(.*?)\>$/) {
#                         $uri = $1;
#                       }
                        else {
                                # let's hope whatever was passed in has a string overload
                                $uri = "$uri";
                        }
                }
                else {
                        Carp::croak(sprintf "You probably didn't mean to pass this " .
                                    "an unblessed %s reference", ref $uri);
                }
        }
        return $uri;
}
sub prefix_for {
        my ($self, $uri) = @_;
        $uri = _scrub_uri($uri);
        my @candidates;
        for my $k ($self->list_prefixes) {
                my $v = $self->namespace_uri($k);
                my $nsuri = $v->as_string;
                # the input should always be longer than the namespace
                next if length $nsuri > length $uri;
                # candidate namespace must match exactly
                my $cns = substr($uri, 0, length $nsuri);
                push @candidates, $k if $cns eq $nsuri;
        }
        # make sure this behaves correctly when empty
        return unless @candidates;
        # if this returns more than one prefix, take the
        # shortest/lexically lowest one.
        @candidates = sort @candidates;
        return wantarray ? @candidates : $candidates[0];
}
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=item abbreviate C<< uri ($uri) >>
Complement to L</namespace_uri>. Returns the given URI in C<foo:bar>
format or C<undef> if it wasn't matched, therefore the idiom
    my $str = $nsmap->abbreviate($uri_node) || $uri->as_string;
may be useful for certain serialization tasks.
=cut
sub abbreviate {
        my ($self, $uri) = @_;
        $uri = _scrub_uri($uri);
        my $prefix = $self->prefix_for($uri);
        return unless defined $prefix;
        my $nsuri = _scrub_uri($self->namespace_uri($prefix));
        return sprintf('%s:%s', $prefix, substr($uri, length $nsuri));
}
our $AUTOLOAD;
sub AUTOLOAD {
        my ($self, $arg) = @_;
        my ($name) = ($AUTOLOAD =~ /::(\w+)$/);
        my $ns = $self->namespace_uri($name);
        return unless $ns;
        return $ns->$arg if $arg;
        return $ns;
}
sub _guess {
        my ($self, @data) = @_;
        my $rnscu = can_load( modules => { 'RDF::NS::Curated' => 0 } );
        my $xmlns = can_load( modules => { 'XML::CommonNS' => 0 } );
        my $rdfns = can_load( modules => { 'RDF::NS' => 20130802 } );
        my $rdfpr = can_load( modules => { 'RDF::Prefixes' => 0 } );
        confess 'To resolve an array, you need at least one of RDF::NS::Curated, XML::CommonNS, RDF::NS or RDF::Prefixes' unless ($rnscu || $xmlns || $rdfns || $rdfpr);
        my %namespaces;
        my $r = URI::NamespaceMap::ReservedLocalParts->new(disallowed => [qw/uri/]);
        foreach my $entry (@data) {
                if ($entry =~ m/^[a-z]\w+$/i) {
                        # This is a prefix
                        carp "Cannot resolve '$entry' without RDF::NS::Curated, XML::CommonNS, RDF::NS" unless ($rnscu || $xmlns || $rdfns);
                        my $i = 1;
                        my $prefix = $entry;
                        while ($r->is_reserved($prefix)) {
                                $prefix .= 'x';
                                carp "Cannot resolve '$entry' as tried prefix '$prefix' conflicts with method names." if ($i > 5);
                                $i++;
                        }
                        if ($rnscu) {
                                my $ns = RDF::NS::Curated->new;
                                $namespaces{$prefix} = $ns->uri($entry);
                        }
                        if ((! $namespaces{$prefix}) && $xmlns) {
                                require XML::CommonNS;
                                XML::CommonNS->import(':all');
                                try {
                                        $namespaces{$prefix} = XML::CommonNS->uri(uc($entry))->toString;
                                }; # Then, XML::CommonNS doesn't have the prefix, which is OK, we just continue
                        }
                        if ((! $namespaces{$prefix}) && $rdfns) {
                                my $ns = RDF::NS->new;
                                $namespaces{$prefix} = $ns->SELECT($entry);
                        }
                        carp "Cannot resolve assumed prefix '$entry'" unless $namespaces{$prefix};
                } else {
                        # Lets assume a URI string
                        carp "Cannot resolve '$entry' without RDF::NS::Curated, RDF::NS or RDF::Prefixes" unless ($rnscu || $rdfns || $rdfpr);
                        my $prefix;
                        if ($rnscu) {
                                my $ns = RDF::NS::Curated->new;
                                $prefix = $ns->prefix($entry);
                        }
                        if ((! $prefix) && ($rdfns)) {
                                my $ns = RDF::NS->new;
                                $prefix = $ns->PREFIX($entry);
                        }
                        if ((! $prefix) && ($rdfpr)) {
                                my $context = RDF::Prefixes->new;
                                $prefix = $context->get_prefix($entry);
                        }
                        unless ($prefix) {
                                carp "Cannot resolve assumed URI string '$entry'";
                        } else {
                                my $i = 1;
                                while ($r->is_reserved($prefix)) {
                                        $prefix .= 'x';
                                        carp "Cannot resolve '$entry' as tried prefix '$prefix' conflicts with method names." if ($i > 5);
                                        $i++;
                                }
                                $namespaces{$prefix} = $entry;
                        }
                }
        }
        return \%namespaces;
}
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=back
=head1 WARNING
Avoid using the names 'can', 'isa', 'VERSION', and 'DOES' as namespace
prefix, because these names are defined as method for every Perl
object by default. The method names 'new' and 'uri' are also
forbidden. Names of methods of L<Moose::Object> must also be avoided.
Using them will result in an error.
=head1 AUTHORS
Chris Prather, C<< <chris@prather.org> >>
Kjetil Kjernsmo, C<< <kjetilk@cpan.org> >>
Gregory Todd Williams, C<< <gwilliams@cpan.org> >>
Toby Inkster, C<< <tobyink@cpan.org> >>
=head1 CONTRIBUTORS
Dorian Taylor
Paul Williams
Zakariyya Mughal
Chris Prather
=head1 BUGS
Please report any bugs using L<github|https://github.com/kjetilk/URI-NamespaceMap/issues>
=head1 SUPPORT
You can find documentation for this module with the perldoc command.
    perldoc URI::NamespaceMap
=head1 COPYRIGHT & LICENSE
Copyright 2012,2013,2014,2015,2016,2017,2018,2019 Gregory Todd Williams, Chris Prather and Kjetil Kjernsmo
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=cut
1;
__END__