1 package Text::Tradition::Collation;
3 use Encode qw( decode_utf8 );
6 use IPC::Run qw( run binary );
8 use Text::Tradition::Collation::Reading;
15 default => sub { Graph->new() },
24 default => sub { Graph->new( undirected => 1 ) },
26 relationships => 'edges',
32 isa => 'Text::Tradition',
37 isa => 'HashRef[Text::Tradition::Collation::Reading]',
41 _add_reading => 'set',
42 del_reading => 'delete',
43 has_reading => 'exists',
46 default => sub { {} },
49 has 'wit_list_separator' => (
58 default => 'base text',
75 isa => 'Text::Tradition::Collation::Reading',
76 writer => '_set_start',
82 isa => 'Text::Tradition::Collation::Reading',
87 # The collation can be created two ways:
88 # 1. Collate a set of witnesses (with CollateX I guess) and process
89 # the results as in 2.
90 # 2. Read a pre-prepared collation in one of a variety of formats,
91 # and make the graph from that.
93 # The graph itself will (for now) be immutable, and the positions
94 # within the graph will also be immutable. We need to calculate those
95 # positions upon graph construction. The equivalences between graph
96 # nodes will be mutable, entirely determined by the user (or possibly
97 # by some semantic pre-processing provided by the user.) So the
98 # constructor should just make an empty equivalences object. The
99 # constructor will also need to make the witness objects, if we didn't
100 # come through option 1.
104 $self->_set_start( $self->add_reading( { 'collation' => $self, 'is_start' => 1 } ) );
105 $self->_set_end( $self->add_reading( { 'collation' => $self, 'is_end' => 1 } ) );
108 ### Reading construct/destruct functions
111 my( $self, $reading ) = @_;
112 unless( ref( $reading ) eq 'Text::Tradition::Collation::Reading' ) {
113 my %args = %$reading;
114 $reading = Text::Tradition::Collation::Reading->new(
115 'collation' => $self,
118 # First check to see if a reading with this ID exists.
119 if( $self->reading( $reading->id ) ) {
120 warn "Collation already has a reading with id " . $reading->id;
123 $self->_add_reading( $reading->id => $reading );
124 # Once the reading has been added, put it in both graphs.
125 $self->sequence->add_vertex( $reading->id );
126 $self->relations->add_vertex( $reading->id );
130 around del_reading => sub {
135 if( ref( $arg ) eq 'Text::Tradition::Collation::Reading' ) {
139 # Remove the reading from the graphs.
140 $self->sequence->delete_vertex( $arg );
141 $self->relations->delete_vertex( $arg );
144 $self->$orig( $arg );
147 # merge_readings( $main, $to_be_deleted );
152 # We only need the IDs for adding paths to the graph, not the reading
153 # objects themselves.
154 my( $kept, $deleted ) = $self->_stringify_args( @_ );
156 # The kept reading should inherit the paths and the relationships
157 # of the deleted reading.
158 foreach my $path ( $self->sequence->edges_at( $deleted ) ) {
159 my @vector = ( $kept );
160 push( @vector, $path->[1] ) if $path->[0] eq $deleted;
161 unshift( @vector, $path->[0] ) if $path->[1] eq $deleted;
162 my %wits = %{$self->sequence->get_edge_attributes( @$path )};
163 $self->sequence->add_edge( @vector );
164 my $fwits = $self->sequence->get_edge_attributes( @vector );
165 @wits{keys %$fwits} = values %$fwits;
166 $self->sequence->set_edge_attributes( @vector, \%wits );
168 foreach my $rel ( $self->relations->edges_at( $deleted ) ) {
169 my @vector = ( $kept );
170 push( @vector, $rel->[0] eq $deleted ? $rel->[1] : $rel->[0] );
171 # Is there a relationship here already? If so, keep it.
172 # TODO Warn about conflicting relationships
173 next if $self->relations->has_edge( @vector );
174 # If not, adopt the relationship that would be deleted.
175 $self->relations->add_edge( @vector );
176 my $attr = $self->relations->get_edge_attributes( @$rel );
177 $self->relations->set_edge_attributes( @vector, $attr );
180 # Do the deletion deed.
181 $self->del_reading( $deleted );
185 # Helper function for manipulating the graph.
186 sub _stringify_args {
187 my( $self, $first, $second, $arg ) = @_;
189 if ref( $first ) eq 'Text::Tradition::Collation::Reading';
190 $second = $second->id
191 if ref( $second ) eq 'Text::Tradition::Collation::Reading';
192 return( $first, $second, $arg );
200 # We only need the IDs for adding paths to the graph, not the reading
201 # objects themselves.
202 my( $source, $target, $wit ) = $self->_stringify_args( @_ );
204 # Connect the readings
205 $self->sequence->add_edge( $source, $target );
206 # Note the witness in question
207 $self->sequence->set_edge_attribute( $source, $target, $wit, 1 );
213 # We only need the IDs for adding paths to the graph, not the reading
214 # objects themselves.
215 my( $source, $target, $wit ) = $self->_stringify_args( @_ );
217 if( $self->sequence->has_edge_attribute( $source, $target, $wit ) ) {
218 $self->sequence->del_edge_attribute( $source, $target, $wit );
220 unless( keys %{$self->sequence->get_edge_attributes( $source, $target )} ) {
221 $self->sequence->delete_edge( $source, $target );
226 # Extra graph-alike utility
229 my( $source, $target, $wit ) = $self->_stringify_args( @_ );
230 return undef unless $self->sequence->has_edge( $source, $target );
231 return $self->sequence->has_edge_attribute( $source, $target, $wit );
234 ### Relationship logic
236 =head2 add_relationship( $reading1, $reading2, $definition )
238 Adds the specified relationship between the two readings. A relationship
239 is transitive (i.e. undirected), and must have the following attributes
240 specified in the hashref $definition:
244 =item * type - Can be one of spelling, orthographic, grammatical, meaning, repetition, transposition. The first three are only valid relationships between readings that occur at the same point in the text.
246 =item * non_correctable - (Optional) True if the reading would not have been corrected independently.
248 =item * non_independent - (Optional) True if the variant is unlikely to have occurred independently in unrelated witnesses.
250 =item * global - (Optional) A meta-attribute, to set the same relationship between readings with the same text whenever they occur in the same place.
256 # Wouldn't it be lovely if edges could be objects, and all this type checking
257 # and attribute management could be done via Moose?
259 sub add_relationship {
261 my( $source, $target, $options ) = $self->_stringify_args( @_ );
264 if( !defined $options->{'type'} ||
265 $options->{'type'} !~ /^(spelling|orthographic|grammatical|meaning|repetition|transposition)$/i ) {
266 my $t = $options->{'type'} ? $options->{'type'} : '';
267 return( undef, "Invalid or missing type" . $options->{'type'} );
269 if( $options->{'type'} =~ /^(spelling|orthographic|grammatical|meaning)$/ ) {
270 $options->{'colocated'} = 1;
273 # Make sure there is not another relationship between these two
275 if( $self->relations->has_edge( $source, $target ) ) {
276 return ( undef, "Relationship already exists between these readings" );
278 if( !$self->relationship_valid( $source, $target, $options->{'type'} ) ) {
279 return ( undef, 'Relationship creates witness loop' );
282 my @vector = ( $source, $target );
283 $self->relations->add_edge( @vector );
284 $self->relations->set_edge_attributes( @vector, $options );
286 # TODO Handle global relationship setting
288 return( 1, @vector );
291 sub relationship_valid {
292 my( $self, $source, $target, $rel ) = @_;
293 if( $rel eq 'repetition' ) {
295 } elsif ( $rel eq 'transposition' ) {
296 # Check that the two readings do not appear in the same witness.
298 map { $seen_wits{$_} = 1 } $self->reading_witnesses( $source );
299 foreach my $w ( $self->reading_witnesses( $target ) ) {
300 return 0 if $seen_wits{$w};
304 # Check that linking the source and target in a relationship won't lead
305 # to a path loop for any witness. First make a lookup table of all the
306 # readings related to either the source or the target.
307 my @proposed_related = ( $source, $target );
308 push( @proposed_related, $source->related_readings( 'colocated' ) );
309 push( @proposed_related, $target->related_readings( 'colocated' ) );
311 map { $pr_ids{ $_->id } = 1 } @proposed_related;
313 # None of these proposed related readings should have a neighbor that
314 # is also in proposed_related.
315 foreach my $pr ( keys %pr_ids ) {
316 foreach my $neighbor( $self->sequence->neighbors( $pr ) ) {
317 return 0 if exists $pr_ids{$neighbor};
324 # Return a list of the witnesses in which the reading appears.
325 sub reading_witnesses {
326 my( $self, $reading ) = @_;
327 # We need only check either the incoming or the outgoing edges; I have
328 # arbitrarily chosen "incoming".
330 foreach my $e ( $self->sequence->edges_to( $reading ) ) {
331 my $wits = $self->sequence->get_edge_attributes( @$e );
332 @all_witnesses{ keys %$wits } = 1;
334 return keys %all_witnesses;
337 sub related_readings {
338 my( $self, $reading, $colocated ) = @_;
340 if( ref( $reading ) eq 'Text::Tradition::Collation::Reading' ) {
341 $reading = $reading->id;
343 # print STDERR "Returning related objects\n";
345 # print STDERR "Returning related object names\n";
347 my @related = $self->relations->all_reachable( $reading );
349 my @colo = grep { $self->relations->has_edge_attribute( $reading, $_, 'colocated' ) } @related;
352 return $return_object ? map { $self->reading( $_ ) } @related : @related;
355 =head2 Output method(s)
361 print $graph->as_svg( $recalculate );
363 Returns an SVG string that represents the graph. Uses GraphViz to do
364 this, because Graph::Easy doesn\'t cope well with long graphs. Unless
365 $recalculate is passed (and is a true value), the method will return a
366 cached copy of the SVG after the first call to the method.
373 my @cmd = qw/dot -Tsvg/;
375 my $dotfile = File::Temp->new();
377 # $dotfile->unlink_on_destroy(0);
378 binmode $dotfile, ':utf8';
379 print $dotfile $self->as_dot();
380 push( @cmd, $dotfile->filename );
381 run( \@cmd, ">", binary(), \$svg );
382 $svg = decode_utf8( $svg );
388 print $graph->as_dot( $view, $recalculate );
390 Returns a string that is the collation graph expressed in dot
391 (i.e. GraphViz) format. The 'view' argument determines what kind of
393 * 'path': a graph of witness paths through the collation (DEFAULT)
394 * 'relationship': a graph of how collation readings relate to
400 my( $self, $view ) = @_;
401 $view = 'sequence' unless $view;
402 # TODO consider making some of these things configurable
403 my $graph_name = $self->tradition->name;
404 $graph_name =~ s/[^\w\s]//g;
405 $graph_name = join( '_', split( /\s+/, $graph_name ) );
406 my $dot = sprintf( "digraph %s {\n", $graph_name );
407 $dot .= "\tedge [ arrowhead=open ];\n";
408 $dot .= "\tgraph [ rankdir=LR ];\n";
409 $dot .= sprintf( "\tnode [ fontsize=%d, fillcolor=%s, style=%s, shape=%s ];\n",
410 11, "white", "filled", "ellipse" );
412 foreach my $reading ( $self->readings ) {
413 # Need not output nodes without separate labels
414 next if $reading->id eq $reading->text;
415 $dot .= sprintf( "\t\"%s\" [ label=\"%s\" ];\n", $reading->id, $reading->text );
418 # TODO do something sensible for relationships
420 my @edges = $self->paths;
421 foreach my $edge ( @edges ) {
422 my %variables = ( 'color' => '#000000',
423 'fontcolor' => '#000000',
424 'label' => join( ', ', $self->path_witnesses( $edge ) ),
426 my $varopts = join( ', ', map { $_.'="'.$variables{$_}.'"' } sort keys %variables );
427 $dot .= sprintf( "\t\"%s\" -> \"%s\" [ %s ];\n",
428 $edge->[0], $edge->[1], $varopts );
435 my( $self, @edge ) = @_;
436 # If edge is an arrayref, cope.
437 if( @edge == 1 && ref( $edge[0] ) eq 'ARRAY' ) {
441 my @wits = keys %{$self->sequence->get_edge_attributes( @edge )};
447 print $graph->as_graphml( $recalculate )
449 Returns a GraphML representation of the collation graph, with
450 transposition information and position information. Unless
451 $recalculate is passed (and is a true value), the method will return a
452 cached copy of the SVG after the first call to the method.
460 my $graphml_ns = 'http://graphml.graphdrawing.org/xmlns';
461 my $xsi_ns = 'http://www.w3.org/2001/XMLSchema-instance';
462 my $graphml_schema = 'http://graphml.graphdrawing.org/xmlns ' .
463 'http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd';
465 # Create the document and root node
466 my $graphml = XML::LibXML->createDocument( "1.0", "UTF-8" );
467 my $root = $graphml->createElementNS( $graphml_ns, 'graphml' );
468 $graphml->setDocumentElement( $root );
469 $root->setNamespace( $xsi_ns, 'xsi', 0 );
470 $root->setAttributeNS( $xsi_ns, 'schemaLocation', $graphml_schema );
472 # Add the data keys for the graph
475 my @graph_attributes = qw/ version wit_list_separator baselabel linear ac_label /;
476 foreach my $datum ( @graph_attributes ) {
477 $graph_data_keys{$datum} = 'dg'.$gdi++;
478 my $key = $root->addNewChild( $graphml_ns, 'key' );
479 $key->setAttribute( 'attr.name', $datum );
480 $key->setAttribute( 'attr.type', $key eq 'linear' ? 'boolean' : 'string' );
481 $key->setAttribute( 'for', 'graph' );
482 $key->setAttribute( 'id', $graph_data_keys{$datum} );
485 # Add the data keys for nodes
492 is_start => 'boolean',
494 is_lacuna => 'boolean',
496 foreach my $datum ( keys %node_data ) {
497 $node_data_keys{$datum} = 'dn'.$ndi++;
498 my $key = $root->addNewChild( $graphml_ns, 'key' );
499 $key->setAttribute( 'attr.name', $datum );
500 $key->setAttribute( 'attr.type', $node_data{$datum} );
501 $key->setAttribute( 'for', 'node' );
502 $key->setAttribute( 'id', $node_data_keys{$datum} );
505 # Add the data keys for edges, i.e. witnesses
509 class => 'string', # Path or relationship?
510 witness => 'string', # ID/label for a path
511 relationship => 'string', # ID/label for a relationship
512 extra => 'boolean', # Path key
513 colocated => 'boolean', # Relationship key
514 non_correctable => 'boolean', # Relationship key
515 non_independent => 'boolean', # Relationship key
517 foreach my $datum ( keys %edge_data ) {
518 $edge_data_keys{$datum} = 'de'.$edi++;
519 my $key = $root->addNewChild( $graphml_ns, 'key' );
520 $key->setAttribute( 'attr.name', $datum );
521 $key->setAttribute( 'attr.type', $edge_data{$datum} );
522 $key->setAttribute( 'for', 'edge' );
523 $key->setAttribute( 'id', $edge_data_keys{$datum} );
526 # Add the collation graph itself
527 my $graph = $root->addNewChild( $graphml_ns, 'graph' );
528 $graph->setAttribute( 'edgedefault', 'directed' );
529 $graph->setAttribute( 'id', $self->tradition->name );
530 $graph->setAttribute( 'parse.edgeids', 'canonical' );
531 $graph->setAttribute( 'parse.edges', scalar($self->paths) );
532 $graph->setAttribute( 'parse.nodeids', 'canonical' );
533 $graph->setAttribute( 'parse.nodes', scalar($self->readings) );
534 $graph->setAttribute( 'parse.order', 'nodesfirst' );
536 # Collation attribute data
537 foreach my $datum ( @graph_attributes ) {
538 my $value = $datum eq 'version' ? '2.0' : $self->$datum;
539 _add_graphml_data( $graph, $graph_data_keys{$datum}, $value );
544 # Add our readings to the graph
545 foreach my $n ( sort { $a->id cmp $b->id } $self->readings ) {
546 my $node_el = $graph->addNewChild( $graphml_ns, 'node' );
547 my $node_xmlid = 'n' . $node_ctr++;
548 $node_hash{ $n->id } = $node_xmlid;
549 $node_el->setAttribute( 'id', $node_xmlid );
550 _add_graphml_data( $node_el, $node_data_keys{'id'}, $n->id );
551 _add_graphml_data( $node_el, $node_data_keys{'reading'}, $n->text );
552 _add_graphml_data( $node_el, $node_data_keys{'rank'}, $n->rank )
558 foreach my $e ( sort { $a->[0] cmp $b->[0] } $self->sequence->edges() ) {
559 # We add an edge in the graphml for every witness in $e.
560 foreach my $wit ( $self->path_witnesses( $e ) ) {
561 my( $id, $from, $to ) = ( 'e'.$edge_ctr++,
562 $node_hash{ $e->[0] },
563 $node_hash{ $e->[1] } );
564 my $edge_el = $graph->addNewChild( $graphml_ns, 'edge' );
565 $edge_el->setAttribute( 'source', $from );
566 $edge_el->setAttribute( 'target', $to );
567 $edge_el->setAttribute( 'id', $id );
569 _add_graphml_data( $edge_el, $edge_data_keys{'class'}, 'path' );
571 # It's a witness path, so add the witness
573 my $key = $edge_data_keys{'witness'};
574 # Is this an ante-corr witness?
575 my $aclabel = $self->ac_label;
576 if( $wit =~ /^(.*)\Q$aclabel\E$/ ) {
577 # Keep the base witness
579 # ...and record that this is an 'extra' reading path
580 _add_graphml_data( $edge_el, $edge_data_keys{'extra'}, $aclabel );
582 _add_graphml_data( $edge_el, $edge_data_keys{'witness'}, $base );
586 # Add the relationship edges
587 foreach my $e ( sort { $a->[0] cmp $b->[0] } $self->relationships ) {
588 my( $id, $from, $to ) = ( 'e'.$edge_ctr++,
589 $node_hash{ $e->[0] },
590 $node_hash{ $e->[1] } );
591 my $edge_el = $graph->addNewChild( $graphml_ns, 'edge' );
592 $edge_el->setAttribute( 'source', $from );
593 $edge_el->setAttribute( 'target', $to );
594 $edge_el->setAttribute( 'id', $id );
596 _add_graphml_data( $edge_el, $edge_data_keys{'class'}, 'relationship' );
598 my $data = $self->relations->get_edge_attributes( @$e );
599 # It's a relationship, so save the relationship data
600 _add_graphml_data( $edge_el, $edge_data_keys{'relationship'}, $data->{type} );
601 _add_graphml_data( $edge_el, $edge_data_keys{'colocated'}, $data->{colocated} );
602 if( exists $data->{non_correctable} ) {
603 _add_graphml_data( $edge_el, $edge_data_keys{'non_correctable'},
604 $data->{non_correctable} );
606 if( exists $data->{non_independent} ) {
607 _add_graphml_data( $edge_el, $edge_data_keys{'non_independent'},
608 $data->{non_independent} );
612 # Save and return the thing
613 my $result = decode_utf8( $graphml->toString(1) );
617 sub _add_graphml_data {
618 my( $el, $key, $value ) = @_;
619 return unless defined $value;
620 my $data_el = $el->addNewChild( $el->namespaceURI, 'data' );
621 $data_el->setAttribute( 'key', $key );
622 $data_el->appendText( $value );
627 print $graph->as_csv( $recalculate )
629 Returns a CSV alignment table representation of the collation graph, one
630 row per witness (or witness uncorrected.) Unless $recalculate is passed
631 (and is a true value), the method will return a cached copy of the CSV
632 after the first call to the method.
638 my $table = $self->make_alignment_table;
639 my $csv = Text::CSV_XS->new( { binary => 1, quote_null => 0 } );
641 foreach my $row ( @$table ) {
642 $csv->combine( @$row );
643 push( @result, decode_utf8( $csv->string ) );
645 return join( "\n", @result );
648 # Make an alignment table - $noderefs controls whether the objects
649 # in the table are the nodes or simply their readings.
651 sub make_alignment_table {
652 my( $self, $noderefs, $include ) = @_;
653 unless( $self->linear ) {
654 warn "Need a linear graph in order to make an alignment table";
658 my @all_pos = ( 1 .. $self->end->rank - 1 );
659 foreach my $wit ( $self->tradition->witnesses ) {
660 # print STDERR "Making witness row(s) for " . $wit->sigil . "\n";
661 my @wit_path = $self->reading_sequence( $self->start, $self->end, $wit->sigil );
662 my @row = _make_witness_row( \@wit_path, \@all_pos, $noderefs );
663 unshift( @row, $wit->sigil );
664 push( @$table, \@row );
665 if( $wit->is_layered ) {
666 my @wit_ac_path = $self->reading_sequence( $self->start, $self->end,
667 $wit->sigil.$self->ac_label, $wit->sigil );
668 my @ac_row = _make_witness_row( \@wit_ac_path, \@all_pos, $noderefs );
669 unshift( @ac_row, $wit->sigil . $self->ac_label );
670 push( @$table, \@ac_row );
676 # Winnow out the rows for any witness not included.
677 foreach my $row ( @$table ) {
678 next unless $include->{$row->[0]};
679 push( @$winnowed, $row );
684 # Return a table where the witnesses read in columns rather than rows.
685 my $turned = _turn_table( $table );
686 # TODO We should really go through and delete empty rows.
690 sub _make_witness_row {
691 my( $path, $positions, $noderefs ) = @_;
693 map { $char_hash{$_} = undef } @$positions;
694 foreach my $rdg ( @$path ) {
695 my $rtext = $rdg->text;
696 $rtext = '#LACUNA#' if $rdg->is_lacuna;
697 # print STDERR "No rank for " . $rdg->id . "\n" unless defined $rdg->rank;
698 $char_hash{$rdg->rank} = $noderefs ? $rdg : $rtext;
700 my @row = map { $char_hash{$_} } @$positions;
701 # Fill in lacuna markers for undef spots in the row
702 my $last_el = shift @row;
703 my @filled_row = ( $last_el );
704 foreach my $el ( @row ) {
705 # If we are using node reference, make the lacuna node appear many times
706 # in the table. If not, use the lacuna tag.
707 if( $last_el && _el_is_lacuna( $last_el ) && !defined $el ) {
708 $el = $noderefs ? $last_el : '#LACUNA#';
710 push( @filled_row, $el );
716 # Tiny utility function to say if a table element is a lacuna
719 return 1 if $el eq '#LACUNA#';
720 return 1 if ref( $el ) eq 'Text::Tradition::Collation::Reading'
725 # Helper to turn the witnesses along columns rather than rows. Assumes
730 return $result unless scalar @$table;
731 my $nrows = scalar @{$table->[0]};
732 foreach my $idx ( 0 .. $nrows - 1 ) {
733 foreach my $wit ( 0 .. $#{$table} ) {
734 $result->[$idx]->[$wit] = $table->[$wit]->[$idx];
742 =head2 Navigation methods
748 my $beginning = $collation->start();
750 Returns the beginning of the collation, a meta-reading with label '#START#'.
754 my $end = $collation->end();
756 Returns the end of the collation, a meta-reading with label '#END#'.
759 =item B<reading_sequence>
761 my @readings = $graph->reading_sequence( $first, $last, $path[, $alt_path] );
763 Returns the ordered list of readings, starting with $first and ending
764 with $last, along the given witness path. If no path is specified,
765 assume that the path is that of the base text (if any.)
769 # TODO Think about returning some lazy-eval iterator.
771 sub reading_sequence {
772 my( $self, $start, $end, $witness, $backup ) = @_;
774 $witness = $self->baselabel unless $witness;
775 my @readings = ( $start );
778 while( $n && $n->id ne $end->id ) {
779 if( exists( $seen{$n->id} ) ) {
780 warn "Detected loop at " . $n->id;
785 my $next = $self->next_reading( $n, $witness, $backup );
786 $DB::single = 1 if $next->id eq $end->id;
788 warn "Did not find any path for $witness from reading " . $n->id;
791 push( @readings, $next );
794 # Check that the last reading is our end reading.
795 my $last = $readings[$#readings];
796 warn "Last reading found from " . $start->text .
797 " for witness $witness is not the end!"
798 unless $last->id eq $end->id;
803 =item B<next_reading>
805 my $next_reading = $graph->next_reading( $reading, $witpath );
807 Returns the reading that follows the given reading along the given witness
813 # Return the successor via the corresponding path.
815 my $answer = $self->_find_linked_reading( 'next', @_ );
816 return $self->reading( $answer );
819 =item B<prior_reading>
821 my $prior_reading = $graph->prior_reading( $reading, $witpath );
823 Returns the reading that precedes the given reading along the given witness
829 # Return the predecessor via the corresponding path.
831 my $answer = $self->_find_linked_reading( 'prior', @_ );
832 return $self->reading( $answer );
835 sub _find_linked_reading {
836 my( $self, $direction, $node, $path, $alt_path ) = @_;
837 my @linked_paths = $direction eq 'next'
838 ? $self->sequence->edges_from( $node )
839 : $self->sequence->edges_to( $node );
840 return undef unless scalar( @linked_paths );
842 # We have to find the linked path that contains all of the
843 # witnesses supplied in $path.
844 my( @path_wits, @alt_path_wits );
845 @path_wits = sort( $self->witnesses_of_label( $path ) ) if $path;
846 @alt_path_wits = sort( $self->witnesses_of_label( $alt_path ) ) if $alt_path;
849 foreach my $le ( @linked_paths ) {
850 if( $self->sequence->has_edge_attribute( @$le, $self->baselabel ) ) {
853 my @le_wits = $self->path_witnesses( $le );
854 if( _is_within( \@path_wits, \@le_wits ) ) {
855 # This is the right path.
856 return $direction eq 'next' ? $le->[1] : $le->[0];
857 } elsif( _is_within( \@alt_path_wits, \@le_wits ) ) {
861 # Got this far? Return the alternate path if it exists.
862 return $direction eq 'next' ? $alt_le->[1] : $alt_le->[0]
865 # Got this far? Return the base path if it exists.
866 return $direction eq 'next' ? $base_le->[1] : $base_le->[0]
869 # Got this far? We have no appropriate path.
870 warn "Could not find $direction node from " . $node->label
871 . " along path $path";
877 my( $set1, $set2 ) = @_;
878 my $ret = @$set1; # will be 0, i.e. false, if set1 is empty
879 foreach my $el ( @$set1 ) {
880 $ret = 0 unless grep { /^\Q$el\E$/ } @$set2;
886 ## INITIALIZATION METHODS - for use by parsers
888 # For use when a collation is constructed from a base text and an apparatus.
889 # We have the sequences of readings and just need to add path edges.
890 # When we are done, clear out the witness path attributes, as they are no
892 # TODO Find a way to replace the witness path attributes with encapsulated functions?
894 sub make_witness_paths {
896 foreach my $wit ( $self->tradition->witnesses ) {
897 print STDERR "Making path for " . $wit->sigil . "\n";
898 $self->make_witness_path( $wit );
902 sub make_witness_path {
903 my( $self, $wit ) = @_;
904 my @chain = @{$wit->path};
905 my $sig = $wit->sigil;
906 foreach my $idx ( 0 .. $#chain-1 ) {
907 $self->add_path( $chain[$idx], $chain[$idx+1], $sig );
909 if( $wit->is_layered ) {
910 @chain = @{$wit->uncorrected_path};
911 foreach my $idx( 0 .. $#chain-1 ) {
912 my $source = $chain[$idx];
913 my $target = $chain[$idx+1];
914 $self->add_path( $source, $target, $sig.$self->ac_label )
915 unless $self->has_path( $source, $target, $sig );
919 $wit->clear_uncorrected_path;
922 sub calculate_ranks {
924 # Walk a version of the graph where every node linked by a relationship
925 # edge is fundamentally the same node, and do a topological ranking on
926 # the nodes in this graph.
927 my $topo_graph = Graph->new();
931 foreach my $r ( $self->readings ) {
932 next if exists $rel_containers{$r->id};
933 my @rels = $r->related_readings( 'colocated' );
935 # Make a relationship container.
937 my $rn = 'rel_container_' . $rel_ctr++;
938 $topo_graph->add_vertex( $rn );
940 $rel_containers{$_->id} = $rn;
943 # Add a new node to mirror the old node.
944 $rel_containers{$r->id} = $r->id;
945 $topo_graph->add_vertex( $r->id );
950 foreach my $r ( $self->readings ) {
951 foreach my $n ( $self->sequence->successors( $r->id ) ) {
952 my( $tfrom, $tto ) = ( $rel_containers{$r->id},
953 $rel_containers{$n} );
954 $topo_graph->add_edge( $tfrom, $tto );
958 # Now do the rankings, starting with the start node.
959 my $topo_start = $rel_containers{$self->start->id};
960 my $node_ranks = { $topo_start => 0 };
961 my @curr_origin = ( $topo_start );
962 # A little iterative function.
963 while( @curr_origin ) {
964 @curr_origin = _assign_rank( $topo_graph, $node_ranks, @curr_origin );
966 # Transfer our rankings from the topological graph to the real one.
967 foreach my $r ( $self->readings ) {
968 if( defined $node_ranks->{$rel_containers{$r->id}} ) {
969 $r->rank( $node_ranks->{$rel_containers{$r->id}} );
972 die "No rank calculated for node " . $r->id
973 . " - do you have a cycle in the graph?";
979 my( $graph, $node_ranks, @current_nodes ) = @_;
980 # Look at each of the children of @current_nodes. If all the child's
981 # parents have a rank, assign it the highest rank + 1 and add it to
982 # @next_nodes. Otherwise skip it; we will return when the highest-ranked
983 # parent gets a rank.
985 foreach my $c ( @current_nodes ) {
986 warn "Current reading $c has no rank!"
987 unless exists $node_ranks->{$c};
988 # print STDERR "Looking at child of node $c, rank "
989 # . $node_ranks->{$c} . "\n";
990 foreach my $child ( $graph->successors( $c ) ) {
991 next if exists $node_ranks->{$child};
992 my $highest_rank = -1;
994 foreach my $parent ( $graph->predecessors( $child ) ) {
995 if( exists $node_ranks->{$parent} ) {
996 $highest_rank = $node_ranks->{$parent}
997 if $highest_rank <= $node_ranks->{$parent};
1004 my $c_rank = $highest_rank + 1;
1005 # print STDERR "Assigning rank $c_rank to node $child \n";
1006 $node_ranks->{$child} = $c_rank;
1007 push( @next_nodes, $child );
1013 # Another method to make up for rough collation methods. If the same reading
1014 # appears multiple times at the same rank, collapse the nodes.
1017 my %unique_rank_rdg;
1018 foreach my $rdg ( $self->readings ) {
1019 next unless $rdg->has_rank;
1020 my $key = $rdg->rank . "||" . $rdg->text;
1021 if( exists $unique_rank_rdg{$key} ) {
1023 print STDERR "Combining readings at same rank: $key\n";
1024 $self->merge_readings( $unique_rank_rdg{$key}, $rdg );
1026 $unique_rank_rdg{$key} = $rdg;
1032 ## Utility functions
1034 # Return the string that joins together a list of witnesses for
1035 # display on a single path.
1036 sub witnesses_of_label {
1037 my( $self, $label ) = @_;
1038 my $regex = $self->wit_list_separator;
1039 my @answer = split( /\Q$regex\E/, $label );
1044 __PACKAGE__->meta->make_immutable;
1050 =item * Rationalize edge classes
1052 =item * Port the internal graph from Graph::Easy to Graph