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use v5.14; |
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use warnings; |
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=head1 NAME |
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Attean::Literal - RDF Literals |
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=head1 VERSION |
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This document describes Attean::Literal version 0.032 |
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=head1 SYNOPSIS |
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use v5.14; |
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use Attean; |
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my $langterm = Attean::Literal->new(value => 'foo', language => 'en-US'); |
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$langterm->ntriples_string; # "foo"@en-US |
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my $typeterm = Attean::Literal->new(value => '123', datatype => 'http://www.w3.org/2001/XMLSchema#integer'); |
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$langterm->ntriples_string; # "123"^^<http://www.w3.org/2001/XMLSchema#integer> |
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=head1 DESCRIPTION |
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The Attean::Literal class represents RDF literals. |
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It conforms to the L<Attean::API::Literal|Attean::API::Term> role. |
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=head1 ATTRIBUTES |
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The following attributes exist: |
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=over 4 |
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=item C<< value >> |
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=item C<< language >> |
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=item C<< datatype >> |
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=back |
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=head1 METHODS |
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=over 4 |
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=item C<< has_language >> |
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Returns true if the literal has a language tag, false otherwise. |
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=cut |
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use Moo; |
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use Types::Standard qw(Str Maybe InstanceOf); |
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use Attean::API::Term; |
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375
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use IRI; |
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1225
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use Sub::Install; |
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1159
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use Sub::Util qw(set_subname); |
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use Scalar::Util qw(blessed); |
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use namespace::clean; |
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my $XSD_STRING = IRI->new(value => 'http://www.w3.org/2001/XMLSchema#string'); |
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has 'value' => (is => 'ro', isa => Str, required => 1); |
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has 'language' => (is => 'ro', isa => Maybe[Str], predicate => 'has_language'); |
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has 'datatype' => ( |
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is => 'ro', |
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isa => InstanceOf['Attean::IRI'], |
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required => 1, |
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coerce => sub { |
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my $dt = shift; |
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if (blessed($dt) and $dt->isa('Attean::IRI')) { |
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return $dt; |
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} else { |
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return blessed($dt) ? Attean::IRI->new($dt->as_string) : Attean::IRI->new($dt) |
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} |
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}, |
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default => sub { $XSD_STRING } |
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); |
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has 'ntriples_string' => (is => 'ro', isa => Str, lazy => 1, builder => '_ntriples_string'); |
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with 'Attean::API::Literal'; |
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around BUILDARGS => sub { |
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my $orig = shift; |
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my $class = shift; |
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return $class->$orig(@_) if (scalar(@_) == 1 and ref($_[0]) eq "HASH"); |
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if (scalar(@_) == 1) { |
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my $dt = IRI->new('http://www.w3.org/2001/XMLSchema#string'); |
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return $class->$orig(value => shift, datatype => $dt); |
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} |
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return $class->$orig(@_); |
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}; |
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around 'datatype' => sub { |
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my $orig = shift; |
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my $self = shift; |
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if ($self->has_language) { |
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return Attean::IRI->new(value => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#langString'); |
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} else { |
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return $self->$orig(@_); |
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} |
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}; |
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my $self = shift; |
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my $value = $self->value; |
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$value =~ s/\\/\\\\/g; |
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$value =~ s/\n/\\n/g; |
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$value =~ s/\r/\\r/g; |
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$value =~ s/"/\\"/g; |
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if ($self->has_language) { |
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return sprintf('"%s"@%s', $value, $self->language); |
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} else { |
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my $dt = $self->datatype->as_string; |
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if ($dt eq 'http://www.w3.org/2001/XMLSchema#string') { |
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return sprintf('"%s"', $value); |
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16795
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} else { |
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1428
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return sprintf('"%s"^^<%s>', $value, $dt); |
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} |
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1
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} |
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} |
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120
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=item C<< true >> |
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122
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The xsd:true term. |
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=cut |
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state $v = Attean::Literal->new( value => 'true', datatype => 'http://www.w3.org/2001/XMLSchema#boolean' ); |
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return $v; |
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} |
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1491
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1491
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1
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1491
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45711
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=item C<< false >> |
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132
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The xsd:false term. |
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=cut |
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state $v = Attean::Literal->new( value => 'false', datatype => 'http://www.w3.org/2001/XMLSchema#boolean' ); |
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return $v; |
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} |
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1
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{ |
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528
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for my $method (qw(integer decimal float double)) { |
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my $code = sub { |
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my $class = shift; |
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return $class->new( value => shift, datatype => "http://www.w3.org/2001/XMLSchema#$method" ); |
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}; |
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Sub::Install::install_sub({ |
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code => set_subname("${method}", $code), |
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842
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as => "${method}" |
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}); |
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} |
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} |
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153
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} |
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1; |
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157
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158
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=back |
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160
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=head1 BUGS |
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162
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Please report any bugs or feature requests to through the GitHub web interface |
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at L<https://github.com/kasei/attean/issues>. |
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165
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=head1 SEE ALSO |
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167
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168
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169
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=head1 AUTHOR |
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171
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Gregory Todd Williams C<< <gwilliams@cpan.org> >> |
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173
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=head1 COPYRIGHT |
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175
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Copyright (c) 2014--2022 Gregory Todd Williams. |
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This program is free software; you can redistribute it and/or modify it under |
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the same terms as Perl itself. |
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179
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=cut |