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23860
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use strict; |
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use warnings; |
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package RDF::Trine::Exporter::GraphViz; |
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{ |
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$RDF::Trine::Exporter::GraphViz::VERSION = '0.141'; |
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} |
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#ABSTRACT: Serialize RDF graphs as dot graph diagrams |
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2380
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use RDF::Trine; |
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use GraphViz qw(2.04); |
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use Scalar::Util qw(reftype blessed); |
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use Carp; |
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use RDF::NS; |
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our $NS = RDF::NS->new('any'); |
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# TODO: create RDF::Trine::Exporter as base class |
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use base qw(RDF::Trine::Serializer); |
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our %FORMATS = ( |
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dot => 'text/plain', |
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ps => 'application/postscript', |
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hpgl => 'application/vnd.hp-hpgl', |
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pcl => 'application/vnd.hp-pcl', |
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mif => 'application/vnd.mif', |
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gif => 'image/gif', |
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jpeg => 'image/jpeg', |
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png => 'image/png', |
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wbmp => 'image/vnd.wap.wbmp', |
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cmapx => 'text/html', |
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imap => 'application/x-httpd-imap', |
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'map' => 'application/x-httpd-imap', |
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vrml => 'model/vrml', |
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fig => 'image/x-xfig', |
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svg => 'image/svg+xml', |
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svgz => 'image/svg+xml', |
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); |
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sub new { |
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my ($class, %args) = @_; |
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my $self = bless \%args, $class; |
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$self->{as} ||= 'dot'; |
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croak 'Unknown format ' . $self->{as} |
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unless $FORMATS{ $self->{as} }; |
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$self->{mime} ||= $FORMATS{ $self->{as} }; |
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50
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$self->{style} ||= { rankdir => 'BT', concentrate => 1 }; |
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$self->{node} ||= { shape => 'plaintext', color => 'gray' }; |
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$self->{resource} ||= { shape => 'box', style => 'rounded', |
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fontcolor => 'blue' }; |
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$self->{literal} ||= { shape => 'box' }; |
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$self->{blank} ||= { label => '', shape => 'point', |
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fillcolor => 'white', color => 'gray', width => '0.3' }; |
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$self->{variable} ||= { fontcolor => 'darkslategray' }; |
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$self->{prevar} ||= '?'; |
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$self->{alias} ||= { }; |
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61
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if ( $self->{url} and (reftype($self->{url})||'') ne 'CODE' ) { |
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$self->{url} = sub { shift->uri }; |
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} |
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65
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return $self; |
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} |
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68
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sub media_types { |
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my $self = shift; |
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return ($self->{mime}); |
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} |
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73
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sub to_string { |
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my ($self, $rdf, %options) = @_; |
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76
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my $g = $self->as_graphviz($rdf, %options); |
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78
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my $format = ($options{as} || $self->{as}); |
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die "Unknown serialization format $format" unless $FORMATS{$format}; |
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81
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my $method = "as_$format"; |
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$method = 'as_canon' if $method eq 'as_dot'; |
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$method = 'as_imap' if $method eq 'as_map'; |
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85
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my $data; |
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eval { |
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# TODO: Catch error message sent to STDOUT by dot if this fails. |
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$g->$method( \$data ); |
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}; |
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91
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return $data; |
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} |
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94
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sub to_file { |
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my ($self, $file, $rdf, %options) = @_; |
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97
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croak "missing file parameter" unless defined $file; |
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99
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if (!ref $file) { |
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$options{as} = $1 if $file =~ /\.([^.]+)$/ and $FORMATS{$1}; |
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open (my $fh, '>', $file); |
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$file = $fh; |
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} |
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105
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print {$file} $self->to_string( $rdf, %options ); |
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} |
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108
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sub serialize_model_to_string { |
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shift->to_string(@_); |
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} |
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112
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sub serialize_model_to_file { |
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shift->to_file(@_); |
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} |
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116
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sub serialize_iterator_to_string { |
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shift->to_string(@_); |
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} |
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120
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sub as_graphviz { |
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my ($self, $rdf, %options) = @_; |
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return unless blessed $rdf; |
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$rdf = $rdf->as_stream if $rdf->isa('RDF::Trine::Model'); |
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return $self->iterator_as_graphviz( $rdf, %options ); |
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} |
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127
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sub iterator_as_graphviz { |
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my ($self, $iter, %options) = @_; |
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130
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# We could make use of named graphs in a later version... |
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$options{title} ||= $self->{title}; |
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133
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$options{namespaces} ||= $self->{namespaces} || $NS; |
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$options{root} ||= $self->{root}; |
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$options{prevar} ||= $self->{prevar}; |
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137
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my $get_alias = $options{alias} || $self->{alias} || { }; |
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if (((reftype $get_alias) || '') eq 'HASH') { |
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my $hash = $get_alias; |
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$get_alias = sub { $hash->{shift} }; |
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} |
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143
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# Basic options. Should be more configurable. |
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my %gopt = %{$self->{style}}; |
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$gopt{node} ||= $self->{node}; |
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147
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my %root_style = ( color => 'red' ); |
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149
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$gopt{name} = $options{title} if defined $options{title}; |
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151
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my $get_edge = $options{edge} || $self->{edge}; |
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153
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my $g = GraphViz->new( %gopt ); |
154
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my %nsprefix = reverse %{$options{namespaces}}; |
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156
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my $get_label = sub { |
157
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my $resource = shift; |
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my $label = do { $_ = $resource->uri; $get_alias->( $_ ); }; |
159
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if (!defined $label) { |
160
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my ($local, $qname) = eval { $resource->qname }; |
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my $prefix = $local ? $nsprefix{$local} : ""; |
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$label = $prefix ? "$prefix:$qname" : $resource->as_string; |
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} |
164
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return $label; |
165
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}; |
166
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167
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my %seen; |
168
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while (my $t = $iter->next) { |
169
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my @nodes; |
170
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my $edge_options = { }; |
171
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if ($get_edge) { |
172
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$_ = $t->predicate->uri; |
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$edge_options = $get_edge->( $t->predicate ); |
174
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} |
175
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next unless defined $edge_options; |
176
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177
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foreach my $pos (qw(subject object)) { |
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my $n = $t->$pos(); |
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my $label; |
180
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if ($n->is_literal) { |
181
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$label = $n->literal_value; |
182
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} elsif( $n->is_resource ) { |
183
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$label = $get_label->($n); |
184
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} elsif( $n->is_blank ) { |
185
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$label = $n->as_string; |
186
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} elsif( $n->is_variable ) { |
187
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$label = $options{prevar}.$n->name; |
188
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} |
189
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# TODO: what about nodes with equal label? |
190
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push(@nodes, $label); |
191
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next if ($seen{ $label }++); |
192
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if ( $n->is_literal ) { |
193
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# TODO: add language / datatype |
194
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$g->add_node( $label, %{$self->{literal}} ); |
195
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} elsif ( $n->is_resource ) { |
196
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my %layout = %{$self->{resource}}; |
197
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$layout{URL} = $self->{url}->( $n ) if $self->{url}; |
198
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if ( ($options{'root'} || '') eq $n->uri ) { |
199
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$layout{$_} = $root_style{$_} for keys %root_style; |
200
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} |
201
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$g->add_node( $label, %layout ); |
202
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} elsif ( $n->is_blank ) { |
203
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$g->add_node( $label, %{$self->{blank}} ); |
204
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} elsif ( $n->is_variable ) { |
205
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$g->add_node( $label, %{$self->{variable}} ); |
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} |
207
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} |
208
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209
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$edge_options->{label} //= $get_label->( $t->predicate ); |
210
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$g->add_edge( @nodes, %$edge_options ); |
211
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} |
212
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213
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return $g; |
214
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} |
215
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216
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1; |
217
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218
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219
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__END__ |
220
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=pod |
221
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222
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=head1 NAME |
223
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224
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|
RDF::Trine::Exporter::GraphViz - Serialize RDF graphs as dot graph diagrams |
225
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226
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=head1 VERSION |
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version 0.141 |
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=head1 SYNOPSIS |
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use RDF::Trine::Exporter::GraphViz; |
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my $ser = RDF::Trine::Exporter::GraphViz->new( as => 'dot' ); |
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my $dot = $ser->to_string( $rdf ); |
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$ser->to_file( 'graph.svg', $rdf ); |
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# highly configurable |
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my $g = RDF::Trine::Exporter::GraphViz->new( |
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namespaces => { |
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foaf => 'http://xmlns.com/foaf/0.1/' |
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}, |
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alias => { |
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'http://www.w3.org/2002/07/owl#sameAs' => '=', |
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}, |
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prevar => '$', # variables as '$x' instead of '?x' |
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url => 1, # hyperlink all URIs |
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# see below for more configuration options |
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); |
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$g->to_file( 'test.svg', $model ); |
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=head1 DESCRIPTION |
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L<RDF::Trine::Model> includes a nice but somehow misplaced and non-customizable |
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method C<as_graphviz>. This module implements an extended version, put in a |
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extends this method in a RDF::Trine::Exporter object. (actually it is a |
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subclass of L<RDF::Trine::Serializer> as long as RDF::Trine has no common class |
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RDF::Trine::Exporter). This module also includes a command line script |
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L<rdfdot> to create graph diagrams from RDF data. |
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=head1 METHODS |
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This modules derives from L<RDF::Trine::Serializer> with all of its methods (a |
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future version may be derived from RDF::Trine::Exporter). The following methods |
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are of interest in particular: |
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=head2 new ( %options ) |
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Creates a new serializer with L<configuration|/CONFIGURATION> options |
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as described below. |
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=head2 to_file ( $file, $rdf [, %options ] ) |
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Serialize RDF data, provided as L<RDF::Trine::Iterator> or as |
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L<RDF::Trine::Model> to a file. C<$file> can be a filehandle or file name. |
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The serialization format is automatically derived from known file extensions. |
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=head2 to_string( $rdf [ %options ] ) |
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Serialize RDF data, provided as L<RDF::Trine::Iterator> or as |
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L<RDF::Trine::Model> to a string. |
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=head2 as_graphviz ( $rdf [, %options ] ) |
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Creates and returns a L<GraphViz> object for further processing. You must |
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provide RDF data as L<RDF::Trine::Iterator> or as L<RDF::Trine::Model>. |
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=head2 media_types |
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Returns the exporter's mime type. For instance if you create an exporter with |
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C<< as => 'svg' >>, this method returns C<< ('image/svg+xml') >>. |
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=head2 serialize_model_to_file ( $file, $model [, %options ] ) |
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Provided as alias for C<to_file> for compatibility with other |
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C<RDF::Trine::Exporter> classes. |
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=head2 serialize_model_to_string ( $model [, %options ] ) |
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Provided as alias for C<to_string> for compatibility with other |
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C<RDF::Trine::Exporter> classes. |
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=head2 serialize_iterator_to_string ( $iterator [, %options ] ) |
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Serialize a L<RDF::Trine::Iterator> as graph diagram to a string. |
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=head2 iterator_as_graphviz ( $iterator ) |
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Internal core method, used by C<to_string> and C<to_file>, which one should |
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better call instead. |
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=head1 CONFIGURATION |
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The following configuration options can be set when creating a new object. |
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=over 4 |
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=item as |
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Specific serialization format with C<dot> as default. Supported formats include |
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canonical DOT format (C<dot>), Graphics Interchange Format (C<gif>), JPEG File |
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Interchange Format (C<jpeg>), Portable Network Graphics (C<png>), Scalable |
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Vector Graphics (C<svg> and C<svgz>), server side HTML imape map (C<imap> or |
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C<map>), client side HTML image map (C<cmapx>), PostScript (C<ps>), Hewlett |
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Packard Graphic Language (C<hpgl>), Printer Command Language (C<pcl>), FIG |
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format (C<fig>), Maker Interchange Format (C<mif>), Wireless BitMap format |
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(C<wbmp>), and Virtual Reality Modeling Language (C<vrml>). |
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=item mime |
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Mime type. By default automatically set based on C<as>. |
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=item style |
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General graph style options as hash reference. Defaults to |
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C<< { rankdir => 'TB', concentrate => 1 } >>. |
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=item node |
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Hash reference with general options to style nodes. Defaults to |
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C<< { shape => 'plaintext', color => 'gray' } >>. |
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=item resource |
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Hash reference with options to style resource nodes. Defaults to |
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C<< { shape => 'box', style => 'rounded', fontcolor => 'blue' } >>. |
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=item literal |
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Hash reference with options to style literal nodes. Defaults to |
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C<< { shape => 'box' } >>. |
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=item blank |
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Hash reference with options to style blank nodes. Defaults to C<< { label => '', |
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shape => 'point', fillcolor => 'white', color => 'gray', width => '0.3' } >>. |
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=item edge |
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Code referece with a function that get passed a predicate and variable C<$_> |
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set to the predicate's URI. The function must return undef to skip the RDF |
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statement or a hash reference with options to style the edge. |
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=item url |
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Add clickable URLs to nodes You can either provide a boolean value or a code |
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reference that returns an URL when given a L<RDF::Trine::Node::Resource>. |
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=item alias |
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Hash reference with URL aliases to show as resource and predicate labels. |
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=item variable |
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Hash reference with options to style variable nodes. Defaults to C<< { |
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fontcolor => 'darkslategray' } >>. |
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=item prevar |
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Which character to prepend to variable names. Defaults to '?'. You can |
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also set it to '$'. By now the setting does not affect variables |
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in Notation3 formulas. |
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=item root |
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An URI that is marked as 'root' node. |
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=item title |
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Add a title to the graph. |
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=item namespaces |
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Hash reference with mapping from prefixes to URI namespaces to abbreviate URIs. |
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By default the prefix mapping from L<RDF::NS> is used. |
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=back |
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401
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=head1 LIMITATIONS |
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This serializer does not support C<negotiate> on purpose. It may optionally be |
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enabled in a future version. GraphViz may fail on large graphs, its error |
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message is not catched yet. Configuration in general is not fully covered by |
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unit tests. Identifiers of blank nodes are not included. |
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408
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=head1 AUTHOR |
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Jakob Voà <voss@gbv.de> |
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=head1 COPYRIGHT AND LICENSE |
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This software is copyright (c) 2012 by Jakob VoÃ. |
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This is free software; you can redistribute it and/or modify it under |
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the same terms as the Perl 5 programming language system itself. |
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=cut |
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