1 package Text::Tradition::Collation::RelationshipStore;
5 use Text::Tradition::Error;
6 use Text::Tradition::Collation::Relationship;
13 Text::Tradition::Collation::RelationshipStore - Keeps track of the relationships
14 between readings in a given collation
18 Text::Tradition is a library for representation and analysis of collated
19 texts, particularly medieval ones. The RelationshipStore is an internal object
20 of the collation, to keep track of the defined relationships (both specific and
21 general) between readings.
28 use_ok( 'Text::Tradition::Collation::RelationshipStore' );
30 # Add some relationships, and delete them
32 my $cxfile = 't/data/Collatex-16.xml';
33 my $t = Text::Tradition->new(
35 'input' => 'CollateX',
38 my $c = $t->collation;
40 my @v1 = $c->add_relationship( 'n21', 'n22', { 'type' => 'meaning' } );
41 is( scalar @v1, 1, "Added a single relationship" );
42 is( $v1[0]->[0], 'n21', "Got correct node 1" );
43 is( $v1[0]->[1], 'n22', "Got correct node 2" );
44 my @v2 = $c->add_relationship( 'n9', 'n23',
45 { 'type' => 'spelling', 'scope' => 'global' } );
46 is( scalar @v2, 2, "Added a global relationship with two instances" );
47 @v1 = $c->del_relationship( 'n22', 'n21' );
48 is( scalar @v1, 1, "Deleted first relationship" );
49 @v2 = $c->del_relationship( 'n8', 'n13' );
50 is( scalar @v2, 2, "Deleted second global relationship" );
52 my @v3 = $c->del_relationship( 'n1', 'n2' );
53 ok( 0, "Should have errored on non-existent relationship" );
54 } catch( Text::Tradition::Error $e ) {
55 like( $e->message, qr/No relationship defined/, "Attempt to delete non-existent relationship errored" );
62 =head2 new( collation => $collation );
64 Creates a new relationship store for the given collation.
70 isa => 'Text::Tradition::Collation',
77 isa => 'HashRef[HashRef[Text::Tradition::Collation::Relationship]]',
78 default => sub { {} },
84 default => sub { Graph->new( undirected => 1 ) },
86 relationships => 'edges',
87 add_reading => 'add_vertex',
88 delete_reading => 'delete_vertex',
92 =head2 get_relationship
94 Return the relationship object, if any, that exists between two readings.
98 sub get_relationship {
101 if( @_ == 1 && ref( $_[0] ) eq 'ARRAY' ) {
102 # Dereference the edge arrayref that was passed.
109 if( $self->graph->has_edge_attribute( @vector, 'object' ) ) {
110 $relationship = $self->graph->get_edge_attribute( @vector, 'object' );
112 return $relationship;
115 sub _set_relationship {
116 my( $self, $relationship, @vector ) = @_;
117 $self->graph->add_edge( @vector );
118 $self->graph->set_edge_attribute( @vector, 'object', $relationship );
123 Create a new relationship with the given options and return it.
124 Warn and return undef if the relationship cannot be created.
129 my( $self, $options ) = @_;
130 # Check to see if a relationship exists between the two given readings
131 my $source = delete $options->{'orig_a'};
132 my $target = delete $options->{'orig_b'};
133 my $rel = $self->get_relationship( $source, $target );
135 if( $rel->type eq 'collated' ) {
136 # Always replace a 'collated' relationship with a more descriptive
138 $self->del_relationship( $source, $target );
139 } elsif( $rel->type ne $options->{'type'} ) {
140 throw( "Another relationship of type " . $rel->type
141 . " already exists between $source and $target" );
147 # Check to see if a nonlocal relationship is defined for the two readings
148 $rel = $self->scoped_relationship( $options->{'reading_a'},
149 $options->{'reading_b'} );
150 if( $rel && $rel->type eq $options->{'type'} ) {
153 throw( sprintf( "Relationship of type %s with scope %s already defined for readings %s and %s", $rel->type, $rel->scope, $options->{'reading_a'}, $options->{'reading_b'} ) );
155 $rel = Text::Tradition::Collation::Relationship->new( $options );
156 $self->add_scoped_relationship( $rel ) if $rel->nonlocal;
161 =head2 add_scoped_relationship( $rel )
163 Keep track of relationships defined between specific readings that are scoped
164 non-locally. Key on whichever reading occurs first alphabetically.
168 sub add_scoped_relationship {
169 my( $self, $rel ) = @_;
170 my $r = $self->scoped_relationship( $rel->reading_a, $rel->reading_b );
172 warn sprintf( "Scoped relationship of type %s already exists between %s and %s",
173 $r->type, $rel->reading_a, $rel->reading_b );
176 $self->scopedrels->{$rel->reading_a}->{$rel->reading_b} = $rel;
179 =head2 scoped_relationship( $reading_a, $reading_b )
181 Returns the general (document-level or global) relationship that has been defined
182 between the two reading strings. Returns undef if there is no general relationship.
186 sub scoped_relationship {
187 my( $self, $rdga, $rdgb ) = @_;
188 my( $first, $second ) = sort( $rdga, $rdgb );
189 if( exists $self->scopedrels->{$first}->{$second} ) {
190 return $self->scopedrels->{$first}->{$second};
196 =head2 add_relationship( $self, $source, $sourcetext, $target, $targettext, $opts )
198 Adds the relationship specified in $opts (see Text::Tradition::Collation::Relationship
199 for the possible options) between the readings given in $source and $target. Sets
200 up a scoped relationship between $sourcetext and $targettext if the relationship is
203 Returns a status boolean and a list of all reading pairs connected by the call to
208 sub add_relationship {
209 my( $self, $source, $source_rdg, $target, $target_rdg, $options ) = @_;
213 if( ref( $options ) eq 'Text::Tradition::Collation::Relationship' ) {
214 $relationship = $options;
215 $thispaironly = 1; # If existing rel, set only where asked.
218 $options->{'scope'} = 'local' unless $options->{'scope'};
220 my( $is_valid, $reason ) =
221 $self->relationship_valid( $source, $target, $options->{'type'} );
222 unless( $is_valid ) {
223 throw( "Invalid relationship: $reason" );
226 # Try to create the relationship object.
227 $options->{'reading_a'} = $source_rdg->text;
228 $options->{'reading_b'} = $target_rdg->text;
229 $options->{'orig_a'} = $source;
230 $options->{'orig_b'} = $target;
231 if( $options->{'scope'} ne 'local' ) {
232 # Is there a relationship with this a & b already?
233 my $otherrel = $self->scoped_relationship( $options->{reading_a},
234 $options->{reading_b} );
235 if( $otherrel && $otherrel->type eq $options->{type}
236 && $otherrel->scope eq $options->{scope} ) {
237 warn "Applying existing scoped relationship";
238 $relationship = $otherrel;
241 $relationship = $self->create( $options ) unless $relationship; # Will throw on error
245 # Find all the pairs for which we need to set the relationship.
246 my @vectors = ( [ $source, $target ] );
247 if( $relationship->colocated && $relationship->nonlocal && !$thispaironly ) {
248 my $c = $self->collation;
249 # Set the same relationship everywhere we can, throughout the graph.
250 my @identical_readings = grep { $_->text eq $relationship->reading_a }
252 foreach my $ir ( @identical_readings ) {
253 next if $ir->id eq $source;
254 # Check to see if there is a target reading with the same text at
257 { $_->rank == $ir->rank && $_->text eq $relationship->reading_b }
261 warn "More than one reading with text " . $target_rdg->text
262 . " at rank " . $ir->rank . "!" if @itarget > 1;
263 push( @vectors, [ $ir->id, $itarget[0]->id ] );
268 # Now set the relationship(s).
270 foreach my $v ( @vectors ) {
271 my $rel = $self->get_relationship( @$v );
272 if( $rel && $rel ne $relationship ) {
273 if( $rel->nonlocal ) {
274 throw( "Found conflicting relationship at @$v" );
276 warn "Not overriding local relationship set at @$v";
280 $self->_set_relationship( $relationship, @$v );
281 push( @pairs_set, $v );
287 =head2 del_relationship( $source, $target )
289 Removes the relationship between the given readings. If the relationship is
290 non-local, removes the relationship everywhere in the graph.
294 sub del_relationship {
295 my( $self, $source, $target ) = @_;
296 my $rel = $self->get_relationship( $source, $target );
297 throw( "No relationship defined between $source and $target" ) unless $rel;
298 my @vectors = ( [ $source, $target ] );
299 $self->_remove_relationship( $source, $target );
300 if( $rel->nonlocal ) {
301 # Remove the relationship wherever it occurs.
302 my @rel_edges = grep { $self->get_relationship( @$_ ) == $rel }
303 $self->relationships;
304 foreach my $re ( @rel_edges ) {
305 $self->_remove_relationship( @$re );
306 push( @vectors, $re );
312 sub _remove_relationship {
313 my( $self, @vector ) = @_;
314 $self->graph->delete_edge( @vector );
317 =head2 relationship_valid( $source, $target, $type )
319 Checks whether a relationship of type $type may exist between the readings given
320 in $source and $target. Returns a tuple of ( status, message ) where status is
321 a yes/no boolean and, if the answer is no, message gives the reason why.
325 sub relationship_valid {
326 my( $self, $source, $target, $rel ) = @_;
327 my $c = $self->collation;
328 if ( $rel eq 'transposition' || $rel eq 'repetition' ) {
329 # Check that the two readings do (for a repetition) or do not (for
330 # a transposition) appear in the same witness.
331 # TODO this might be called before witness paths are set...
333 map { $seen_wits{$_} = 1 } $c->reading_witnesses( $source );
334 foreach my $w ( $c->reading_witnesses( $target ) ) {
335 if( $seen_wits{$w} ) {
336 return ( 0, "Readings both occur in witness $w" )
337 if $rel eq 'transposition';
338 return ( 1, "ok" ) if $rel eq 'repetition';
340 return $rel eq 'transposition' ? ( 1, "ok" )
341 : ( 0, "Readings occur only in distinct witnesses" );
344 # Check that linking the source and target in a relationship won't lead
345 # to a path loop for any witness. If they have the same rank then fine.
347 if $c->reading( $source )->has_rank
348 && $c->reading( $target )->has_rank
349 && $c->reading( $source )->rank == $c->reading( $target )->rank;
351 # Otherwise, first make a lookup table of all the
352 # readings related to either the source or the target.
353 my @proposed_related = ( $source, $target );
354 # Drop the collation links of source and target, unless we want to
355 # add a collation relationship.
356 foreach my $r ( ( $source, $target ) ) {
357 $self->_drop_collations( $r ) unless $rel eq 'collated';
358 push( @proposed_related, $self->related_readings( $r, 'colocated' ) );
361 map { $pr_ids{ $_ } = 1 } @proposed_related;
363 # The cumulative predecessors and successors of the proposed-related readings
364 # should not overlap.
367 foreach my $pr ( keys %pr_ids ) {
368 map { $all_pred{$_} = 1 } $c->sequence->all_predecessors( $pr );
369 map { $all_succ{$_} = 1 } $c->sequence->all_successors( $pr );
371 foreach my $k ( keys %all_pred ) {
372 return( 0, "Relationship would create witness loop" )
373 if exists $all_succ{$k};
375 foreach my $k ( keys %pr_ids ) {
376 return( 0, "Relationship would create witness loop" )
377 if exists $all_pred{$k} || exists $all_succ{$k};
383 sub _drop_collations {
384 my( $self, $reading ) = @_;
385 foreach my $n ( $self->graph->neighbors( $reading ) ) {
386 if( $self->get_relationship( $reading, $n )->type eq 'collated' ) {
387 $self->del_relationship( $reading, $n );
392 =head2 related_readings( $reading, $filter )
394 Returns a list of readings that are connected via relationship links to $reading.
395 If $filter is set to a subroutine ref, returns only those related readings where
396 $filter( $relationship ) returns a true value.
400 sub related_readings {
401 my( $self, $reading, $filter ) = @_;
403 if( ref( $reading ) eq 'Text::Tradition::Collation::Reading' ) {
404 $reading = $reading->id;
410 if( $filter eq 'colocated' ) {
411 $filter = sub { $_[0]->colocated };
413 my %found = ( $reading => 1 );
414 my $check = [ $reading ];
418 foreach my $r ( @$check ) {
419 foreach my $nr ( $self->graph->neighbors( $r ) ) {
420 if( &$filter( $self->get_relationship( $r, $nr ) ) ) {
421 push( @$more, $nr ) unless exists $found{$nr};
428 delete $found{$reading};
429 @answer = keys %found;
431 @answer = $self->graph->all_reachable( $reading );
433 if( $return_object ) {
434 my $c = $self->collation;
435 return map { $c->reading( $_ ) } @answer;
441 =head2 merge_readings( $kept, $deleted );
443 Makes a best-effort merge of the relationship links between the given readings, and
444 stops tracking the to-be-deleted reading.
449 my( $self, $kept, $deleted, $combined ) = @_;
450 foreach my $edge ( $self->graph->edges_at( $deleted ) ) {
451 # Get the pair of kept / rel
452 my @vector = ( $kept );
453 push( @vector, $edge->[0] eq $deleted ? $edge->[1] : $edge->[0] );
454 next if $vector[0] eq $vector[1]; # Don't add a self loop
456 # If kept changes its text, drop the relationship.
459 # If kept / rel already has a relationship, warn and keep the old
460 my $rel = $self->get_relationship( @vector );
462 warn sprintf( "Readings %s and %s have existing relationship; dropping link with %s", @vector, $deleted );
466 # Otherwise, adopt the relationship that would be deleted.
467 $rel = $self->get_relationship( @$edge );
468 $self->_set_relationship( $rel, @vector );
470 $self->delete_reading( $deleted );
474 my( $self, $graphml_ns, $xmlroot, $node_hash, $nodeid_key, $edge_keys ) = @_;
476 my $rgraph = $xmlroot->addNewChild( $graphml_ns, 'graph' );
477 $rgraph->setAttribute( 'edgedefault', 'directed' );
478 $rgraph->setAttribute( 'id', 'relationships', );
479 $rgraph->setAttribute( 'parse.edgeids', 'canonical' );
480 $rgraph->setAttribute( 'parse.edges', scalar($self->graph->edges) );
481 $rgraph->setAttribute( 'parse.nodeids', 'canonical' );
482 $rgraph->setAttribute( 'parse.nodes', scalar($self->graph->vertices) );
483 $rgraph->setAttribute( 'parse.order', 'nodesfirst' );
485 # Add the vertices according to their XML IDs
486 my %rdg_lookup = ( reverse %$node_hash );
487 foreach my $n ( sort _by_xmlid keys( %rdg_lookup ) ) {
488 my $n_el = $rgraph->addNewChild( $graphml_ns, 'node' );
489 $n_el->setAttribute( 'id', $n );
490 _add_graphml_data( $n_el, $nodeid_key, $rdg_lookup{$n} );
493 # Add the relationship edges, with their object information
495 foreach my $e ( sort { $a->[0] cmp $b->[0] } $self->graph->edges ) {
496 # Add an edge and fill in its relationship info.
497 my $edge_el = $rgraph->addNewChild( $graphml_ns, 'edge' );
498 $edge_el->setAttribute( 'source', $node_hash->{$e->[0]} );
499 $edge_el->setAttribute( 'target', $node_hash->{$e->[1]} );
500 $edge_el->setAttribute( 'id', 'e'.$edge_ctr++ );
502 my $rel_obj = $self->get_relationship( @$e );
503 foreach my $key ( keys %$edge_keys ) {
504 my $value = $rel_obj->$key;
505 _add_graphml_data( $edge_el, $edge_keys->{$key}, $value )
516 return $tmp_a <=> $tmp_b;
519 sub _add_graphml_data {
520 my( $el, $key, $value ) = @_;
521 return unless defined $value;
522 my $data_el = $el->addNewChild( $el->namespaceURI, 'data' );
523 $data_el->setAttribute( 'key', $key );
524 $data_el->appendText( $value );
528 Text::Tradition::Error->throw(
529 'ident' => 'Relationship error',
535 __PACKAGE__->meta->make_immutable;