1 package Text::Tradition::Collation;
4 use Encode qw( decode_utf8 );
8 use IPC::Run qw( run binary );
10 use Text::Tradition::Collation::Reading;
11 use Text::Tradition::Collation::RelationshipStore;
12 use Text::Tradition::Error;
13 use XML::Easy::Syntax qw( $xml10_namestartchar_rx $xml10_namechar_rx );
15 use XML::LibXML::XPathContext;
21 default => sub { Graph->new() },
29 isa => 'Text::Tradition::Collation::RelationshipStore',
31 relationships => 'relationships',
32 related_readings => 'related_readings',
33 get_relationship => 'get_relationship',
34 del_relationship => 'del_relationship',
35 equivalence => 'equivalence',
36 equivalence_graph => 'equivalence_graph',
38 writer => '_set_relations',
43 isa => 'Text::Tradition',
44 writer => '_set_tradition',
49 isa => 'HashRef[Text::Tradition::Collation::Reading]',
53 _add_reading => 'set',
54 del_reading => 'delete',
55 has_reading => 'exists',
58 default => sub { {} },
61 has 'wit_list_separator' => (
70 default => 'base text',
93 isa => 'Text::Tradition::Collation::Reading',
94 writer => '_set_start',
100 isa => 'Text::Tradition::Collation::Reading',
101 writer => '_set_end',
105 has 'cached_svg' => (
108 predicate => 'has_cached_svg',
109 clearer => 'wipe_svg',
112 has 'cached_table' => (
115 predicate => 'has_cached_table',
116 clearer => 'wipe_table',
119 has '_graphcalc_done' => (
127 Text::Tradition::Collation - a software model for a text collation
132 my $t = Text::Tradition->new(
133 'name' => 'this is a text',
135 'file' => '/path/to/tei_parallel_seg_file.xml' );
137 my $c = $t->collation;
138 my @readings = $c->readings;
139 my @paths = $c->paths;
140 my @relationships = $c->relationships;
142 my $svg_variant_graph = $t->collation->as_svg();
146 Text::Tradition is a library for representation and analysis of collated
147 texts, particularly medieval ones. The Collation is the central feature of
148 a Tradition, where the text, its sequence of readings, and its relationships
149 between readings are actually kept.
155 The constructor. Takes a hash or hashref of the following arguments:
159 =item * tradition - The Text::Tradition object to which the collation
162 =item * linear - Whether the collation should be linear; that is, whether
163 transposed readings should be treated as two linked readings rather than one,
164 and therefore whether the collation graph is acyclic. Defaults to true.
166 =item * baselabel - The default label for the path taken by a base text
167 (if any). Defaults to 'base text'.
169 =item * wit_list_separator - The string to join a list of witnesses for
170 purposes of making labels in display graphs. Defaults to ', '.
172 =item * ac_label - The extra label to tack onto a witness sigil when
173 representing another layer of path for the given witness - that is, when
174 a text has more than one possible reading due to scribal corrections or
175 the like. Defaults to ' (a.c.)'.
177 =item * wordsep - The string used to separate words in the original text.
188 =head2 wit_list_separator
196 Simple accessors for collation attributes.
200 The meta-reading at the start of every witness path.
204 The meta-reading at the end of every witness path.
208 Returns all Reading objects in the graph.
210 =head2 reading( $id )
212 Returns the Reading object corresponding to the given ID.
214 =head2 add_reading( $reading_args )
216 Adds a new reading object to the collation.
217 See L<Text::Tradition::Collation::Reading> for the available arguments.
219 =head2 del_reading( $object_or_id )
221 Removes the given reading from the collation, implicitly removing its
222 paths and relationships.
224 =head2 merge_readings( $main, $second, $concatenate, $with_str )
226 Merges the $second reading into the $main one. If $concatenate is true, then
227 the merged node will carry the text of both readings, concatenated with either
228 $with_str (if specified) or a sensible default (the empty string if the
229 appropriate 'join_*' flag is set on either reading, or else $self->wordsep.)
231 The first two arguments may be either readings or reading IDs.
233 =head2 has_reading( $id )
235 Predicate to see whether a given reading ID is in the graph.
237 =head2 reading_witnesses( $object_or_id )
239 Returns a list of sigils whose witnesses contain the reading.
243 Returns all reading paths within the document - that is, all edges in the
244 collation graph. Each path is an arrayref of [ $source, $target ] reading IDs.
246 =head2 add_path( $source, $target, $sigil )
248 Links the given readings in the collation in sequence, under the given witness
249 sigil. The readings may be specified by object or ID.
251 =head2 del_path( $source, $target, $sigil )
253 Links the given readings in the collation in sequence, under the given witness
254 sigil. The readings may be specified by object or ID.
256 =head2 has_path( $source, $target );
258 Returns true if the two readings are linked in sequence in any witness.
259 The readings may be specified by object or ID.
263 Returns all Relationship objects in the collation.
265 =head2 add_relationship( $reading, $other_reading, $options )
267 Adds a new relationship of the type given in $options between the two readings,
268 which may be specified by object or ID. Returns a value of ( $status, @vectors)
269 where $status is true on success, and @vectors is a list of relationship edges
270 that were ultimately added.
271 See L<Text::Tradition::Collation::Relationship> for the available options.
277 $self->_set_relations( Text::Tradition::Collation::RelationshipStore->new( 'collation' => $self ) );
278 $self->_set_start( $self->add_reading(
279 { 'collation' => $self, 'is_start' => 1, 'init' => 1 } ) );
280 $self->_set_end( $self->add_reading(
281 { 'collation' => $self, 'is_end' => 1, 'init' => 1 } ) );
284 ### Reading construct/destruct functions
287 my( $self, $reading ) = @_;
288 unless( ref( $reading ) eq 'Text::Tradition::Collation::Reading' ) {
289 my %args = %$reading;
290 if( $args{'init'} ) {
291 # If we are initializing an empty collation, don't assume that we
292 # have set a tradition.
293 delete $args{'init'};
294 } elsif( $self->tradition->has_language && !exists $args{'language'} ) {
295 $args{'language'} = $self->tradition->language;
297 $reading = Text::Tradition::Collation::Reading->new(
298 'collation' => $self,
301 # First check to see if a reading with this ID exists.
302 if( $self->reading( $reading->id ) ) {
303 throw( "Collation already has a reading with id " . $reading->id );
305 $self->_graphcalc_done(0);
306 $self->_add_reading( $reading->id => $reading );
307 # Once the reading has been added, put it in both graphs.
308 $self->sequence->add_vertex( $reading->id );
309 $self->relations->add_reading( $reading->id );
313 around del_reading => sub {
318 if( ref( $arg ) eq 'Text::Tradition::Collation::Reading' ) {
321 # Remove the reading from the graphs.
322 $self->_graphcalc_done(0);
323 $self->_clear_cache; # Explicitly clear caches to GC the reading
324 $self->sequence->delete_vertex( $arg );
325 $self->relations->delete_reading( $arg );
328 $self->$orig( $arg );
335 my $cxfile = 't/data/Collatex-16.xml';
336 my $t = Text::Tradition->new(
338 'input' => 'CollateX',
341 my $c = $t->collation;
343 my $rno = scalar $c->readings;
344 # Split n21 for testing purposes
345 my $new_r = $c->add_reading( { 'id' => 'n21p0', 'text' => 'un', 'join_next' => 1 } );
346 my $old_r = $c->reading( 'n21' );
347 $old_r->alter_text( 'to' );
348 $c->del_path( 'n20', 'n21', 'A' );
349 $c->add_path( 'n20', 'n21p0', 'A' );
350 $c->add_path( 'n21p0', 'n21', 'A' );
352 ok( $c->reading( 'n21p0' ), "New reading exists" );
353 is( scalar $c->readings, $rno, "Reading add offset by flatten_ranks" );
355 # Combine n3 and n4 ( with his )
356 $c->merge_readings( 'n3', 'n4', 1 );
357 ok( !$c->reading('n4'), "Reading n4 is gone" );
358 is( $c->reading('n3')->text, 'with his', "Reading n3 has both words" );
360 # Collapse n9 and n10 ( rood / root )
361 $c->merge_readings( 'n9', 'n10' );
362 ok( !$c->reading('n10'), "Reading n10 is gone" );
363 is( $c->reading('n9')->text, 'rood', "Reading n9 has an unchanged word" );
365 # Combine n21 and n21p0
366 my $remaining = $c->reading('n21');
367 $remaining ||= $c->reading('n22'); # one of these should still exist
368 $c->merge_readings( 'n21p0', $remaining, 1 );
369 ok( !$c->reading('n21'), "Reading $remaining is gone" );
370 is( $c->reading('n21p0')->text, 'unto', "Reading n21p0 merged correctly" );
380 my( $kept_obj, $del_obj, $combine, $combine_char ) = $self->_objectify_args( @_ );
381 my $mergemeta = $kept_obj->is_meta;
382 throw( "Cannot merge meta and non-meta reading" )
383 unless ( $mergemeta && $del_obj->is_meta )
384 || ( !$mergemeta && !$del_obj->is_meta );
386 throw( "Cannot merge with start or end node" )
387 if( $kept_obj eq $self->start || $kept_obj eq $self->end
388 || $del_obj eq $self->start || $del_obj eq $self->end );
390 # We only need the IDs for adding paths to the graph, not the reading
391 # objects themselves.
392 my $kept = $kept_obj->id;
393 my $deleted = $del_obj->id;
394 $self->_graphcalc_done(0);
396 # The kept reading should inherit the paths and the relationships
397 # of the deleted reading.
398 foreach my $path ( $self->sequence->edges_at( $deleted ) ) {
399 my @vector = ( $kept );
400 push( @vector, $path->[1] ) if $path->[0] eq $deleted;
401 unshift( @vector, $path->[0] ) if $path->[1] eq $deleted;
402 next if $vector[0] eq $vector[1]; # Don't add a self loop
403 my %wits = %{$self->sequence->get_edge_attributes( @$path )};
404 $self->sequence->add_edge( @vector );
405 my $fwits = $self->sequence->get_edge_attributes( @vector );
406 @wits{keys %$fwits} = values %$fwits;
407 $self->sequence->set_edge_attributes( @vector, \%wits );
409 $self->relations->merge_readings( $kept, $deleted, $combine );
411 # Do the deletion deed.
413 # Combine the text of the readings
414 my $joinstr = $combine_char;
415 unless( defined $joinstr ) {
416 $joinstr = '' if $kept_obj->join_next || $del_obj->join_prior;
417 $joinstr = $self->wordsep unless defined $joinstr;
419 $kept_obj->alter_text( join( $joinstr, $kept_obj->text, $del_obj->text ) );
420 # Change this reading to a joining one if necessary
421 $kept_obj->_set_join_next( $del_obj->join_next );
422 $kept_obj->normal_form(
423 join( $joinstr, $kept_obj->normal_form, $del_obj->normal_form ) );
424 # Combine the lexemes present in the readings
425 if( $kept_obj->has_lexemes && $del_obj->has_lexemes ) {
426 $kept_obj->add_lexeme( $del_obj->lexemes );
429 $self->del_reading( $deleted );
432 =head2 compress_readings
434 Where possible in the graph, compresses plain sequences of readings into a
435 single reading. The sequences must consist of readings with no
436 relationships to other readings, with only a single witness path between
437 them and no other witness paths from either that would skip the other. The
438 readings must also not be marked as nonsense or bad grammar.
440 WARNING: This operation cannot be undone.
444 sub compress_readings {
446 # Anywhere in the graph that there is a reading that joins only to a single
447 # successor, and neither of these have any relationships, just join the two
450 foreach my $rdg ( sort { $a->rank <=> $b->rank } $self->readings ) {
451 next if $rdg->is_meta;
452 next if $gobbled{$rdg->id};
453 next if $rdg->grammar_invalid || $rdg->is_nonsense;
454 next if $rdg->related_readings();
456 while( $self->sequence->successors( $rdg ) == 1 ) {
457 my( $next ) = $self->reading( $self->sequence->successors( $rdg ) );
458 throw( "Infinite loop" ) if $seen{$next->id};
459 $seen{$next->id} = 1;
460 last if $self->sequence->predecessors( $next ) > 1;
461 last if $next->is_meta;
462 last if $next->grammar_invalid || $next->is_nonsense;
463 last if $next->related_readings();
464 say "Joining readings $rdg and $next";
465 $self->merge_readings( $rdg, $next, 1 );
468 # Make sure we haven't screwed anything up
469 foreach my $wit ( $self->tradition->witnesses ) {
470 my $pathtext = $self->path_text( $wit->sigil );
471 my $origtext = join( ' ', @{$wit->text} );
472 throw( "Text differs for witness " . $wit->sigil )
473 unless $pathtext eq $origtext;
474 if( $wit->is_layered ) {
475 $pathtext = $self->path_text( $wit->sigil.$self->ac_label );
476 $origtext = join( ' ', @{$wit->layertext} );
477 throw( "Ante-corr text differs for witness " . $wit->sigil )
478 unless $pathtext eq $origtext;
482 $self->relations->rebuild_equivalence();
483 $self->calculate_ranks();
486 # Helper function for manipulating the graph.
487 sub _stringify_args {
488 my( $self, $first, $second, @args ) = @_;
490 if ref( $first ) eq 'Text::Tradition::Collation::Reading';
491 $second = $second->id
492 if ref( $second ) eq 'Text::Tradition::Collation::Reading';
493 return( $first, $second, @args );
496 # Helper function for manipulating the graph.
497 sub _objectify_args {
498 my( $self, $first, $second, $arg ) = @_;
499 $first = $self->reading( $first )
500 unless ref( $first ) eq 'Text::Tradition::Collation::Reading';
501 $second = $self->reading( $second )
502 unless ref( $second ) eq 'Text::Tradition::Collation::Reading';
503 return( $first, $second, $arg );
510 # We only need the IDs for adding paths to the graph, not the reading
511 # objects themselves.
512 my( $source, $target, $wit ) = $self->_stringify_args( @_ );
514 $self->_graphcalc_done(0);
515 # Connect the readings
516 unless( $self->sequence->has_edge( $source, $target ) ) {
517 $self->sequence->add_edge( $source, $target );
518 $self->relations->add_equivalence_edge( $source, $target );
520 # Note the witness in question
521 $self->sequence->set_edge_attribute( $source, $target, $wit, 1 );
527 if( ref( $_[0] ) eq 'ARRAY' ) {
534 # We only need the IDs for adding paths to the graph, not the reading
535 # objects themselves.
536 my( $source, $target, $wit ) = $self->_stringify_args( @args );
538 $self->_graphcalc_done(0);
539 if( $self->sequence->has_edge_attribute( $source, $target, $wit ) ) {
540 $self->sequence->delete_edge_attribute( $source, $target, $wit );
542 unless( keys %{$self->sequence->get_edge_attributes( $source, $target )} ) {
543 $self->sequence->delete_edge( $source, $target );
544 $self->relations->delete_equivalence_edge( $source, $target );
549 # Extra graph-alike utility
552 my( $source, $target, $wit ) = $self->_stringify_args( @_ );
553 return undef unless $self->sequence->has_edge( $source, $target );
554 return $self->sequence->has_edge_attribute( $source, $target, $wit );
557 =head2 clear_witness( @sigil_list )
559 Clear the given witnesses out of the collation entirely, removing references
560 to them in paths, and removing readings that belong only to them. Should only
561 be called via $tradition->del_witness.
566 my( $self, @sigils ) = @_;
568 $self->_graphcalc_done(0);
569 # Clear the witness(es) out of the paths
570 foreach my $e ( $self->paths ) {
571 foreach my $sig ( @sigils ) {
572 $self->del_path( $e, $sig );
576 # Clear out the newly unused readings
577 foreach my $r ( $self->readings ) {
578 unless( $self->reading_witnesses( $r ) ) {
579 $self->del_reading( $r );
584 sub add_relationship {
586 my( $source, $target, $opts ) = $self->_stringify_args( @_ );
587 my( @vectors ) = $self->relations->add_relationship( $source, $target, $opts );
588 $self->_graphcalc_done(0);
592 around qw/ get_relationship del_relationship / => sub {
596 if( @args == 1 && ref( $args[0] ) eq 'ARRAY' ) {
599 my( $source, $target ) = $self->_stringify_args( @args );
600 $self->$orig( $source, $target );
603 =head2 reading_witnesses( $reading )
605 Return a list of sigils corresponding to the witnesses in which the reading appears.
609 sub reading_witnesses {
610 my( $self, $reading ) = @_;
611 # We need only check either the incoming or the outgoing edges; I have
612 # arbitrarily chosen "incoming". Thus, special-case the start node.
613 if( $reading eq $self->start ) {
614 return map { $_->sigil } $self->tradition->witnesses;
617 foreach my $e ( $self->sequence->edges_to( $reading ) ) {
618 my $wits = $self->sequence->get_edge_attributes( @$e );
619 @all_witnesses{ keys %$wits } = 1;
621 my $acstr = $self->ac_label;
622 foreach my $acwit ( grep { $_ =~ s/^(.*)\Q$acstr\E$/$1/ } keys %all_witnesses ) {
623 delete $all_witnesses{$acwit.$acstr} if exists $all_witnesses{$acwit};
625 return keys %all_witnesses;
628 =head1 OUTPUT METHODS
630 =head2 as_svg( \%options )
632 Returns an SVG string that represents the graph, via as_dot and graphviz.
633 See as_dot for a list of options. Must have GraphViz (dot) installed to run.
638 my( $self, $opts ) = @_;
639 throw( "Need GraphViz installed to output SVG" )
640 unless File::Which::which( 'dot' );
641 my $want_subgraph = exists $opts->{'from'} || exists $opts->{'to'};
642 $self->calculate_ranks()
643 unless( $self->_graphcalc_done || $opts->{'nocalc'} || !$self->linear );
644 if( !$self->has_cached_svg || $opts->{'recalc'} || $want_subgraph ) {
645 my @cmd = qw/dot -Tsvg/;
647 my $dotfile = File::Temp->new();
649 # $dotfile->unlink_on_destroy(0);
650 binmode $dotfile, ':utf8';
651 print $dotfile $self->as_dot( $opts );
652 push( @cmd, $dotfile->filename );
653 run( \@cmd, ">", binary(), \$svg );
654 $svg = decode_utf8( $svg );
655 $self->cached_svg( $svg ) unless $want_subgraph;
658 return $self->cached_svg;
663 =head2 as_dot( \%options )
665 Returns a string that is the collation graph expressed in dot
666 (i.e. GraphViz) format. Options include:
681 my( $self, $opts ) = @_;
682 my $startrank = $opts->{'from'} if $opts;
683 my $endrank = $opts->{'to'} if $opts;
684 my $color_common = $opts->{'color_common'} if $opts;
685 my $STRAIGHTENHACK = !$startrank && !$endrank && $self->end->rank
686 && $self->end->rank > 100;
687 $STRAIGHTENHACK = 1 if $opts->{'straight'}; # even for subgraphs or small graphs
689 # Check the arguments
691 return if $endrank && $startrank > $endrank;
692 return if $startrank > $self->end->rank;
694 if( defined $endrank ) {
695 return if $endrank < 0;
696 $endrank = undef if $endrank == $self->end->rank;
699 my $graph_name = $self->tradition->name;
700 $graph_name =~ s/[^\w\s]//g;
701 $graph_name = join( '_', split( /\s+/, $graph_name ) );
709 'fillcolor' => 'white',
714 'arrowhead' => 'open',
715 'color' => '#000000',
716 'fontcolor' => '#000000',
719 my $dot = sprintf( "digraph %s {\n", $graph_name );
720 $dot .= "\tgraph " . _dot_attr_string( \%graph_attrs ) . ";\n";
721 $dot .= "\tnode " . _dot_attr_string( \%node_attrs ) . ";\n";
723 # Output substitute start/end readings if necessary
725 $dot .= "\t\"__SUBSTART__\" [ label=\"...\",id=\"__START__\" ];\n";
728 $dot .= "\t\"__SUBEND__\" [ label=\"...\",id=\"__END__\" ];\n";
730 if( $STRAIGHTENHACK ) {
732 my $startlabel = $startrank ? '__SUBSTART__' : '__START__';
733 $dot .= "\tsubgraph { rank=same \"$startlabel\" \"#SILENT#\" }\n";
734 $dot .= "\t\"#SILENT#\" [ shape=diamond,color=white,penwidth=0,label=\"\" ];"
736 my %used; # Keep track of the readings that actually appear in the graph
737 # Sort the readings by rank if we have ranks; this speeds layout.
738 my @all_readings = $self->end->has_rank
739 ? sort { $a->rank <=> $b->rank } $self->readings
741 # TODO Refrain from outputting lacuna nodes - just grey out the edges.
742 foreach my $reading ( @all_readings ) {
743 # Only output readings within our rank range.
744 next if $startrank && $reading->rank < $startrank;
745 next if $endrank && $reading->rank > $endrank;
746 $used{$reading->id} = 1;
747 # Need not output nodes without separate labels
748 next if $reading->id eq $reading->text;
750 my $label = $reading->text;
751 $label .= '-' if $reading->join_next;
752 $label = "-$label" if $reading->join_prior;
753 $label =~ s/\"/\\\"/g;
754 $rattrs->{'label'} = $label;
755 $rattrs->{'id'} = $reading->id;
756 $rattrs->{'fillcolor'} = '#b3f36d' if $reading->is_common && $color_common;
757 $dot .= sprintf( "\t\"%s\" %s;\n", $reading->id, _dot_attr_string( $rattrs ) );
760 # Add the real edges. Need to weight one edge per rank jump, in a
762 # my $weighted = $self->_add_edge_weights;
763 my @edges = $self->paths;
764 my( %substart, %subend );
765 foreach my $edge ( @edges ) {
766 # Do we need to output this edge?
767 if( $used{$edge->[0]} && $used{$edge->[1]} ) {
768 my $label = $self->_path_display_label( $self->path_witnesses( $edge ) );
769 my $variables = { %edge_attrs, 'label' => $label };
771 # Account for the rank gap if necessary
772 my $rank0 = $self->reading( $edge->[0] )->rank
773 if $self->reading( $edge->[0] )->has_rank;
774 my $rank1 = $self->reading( $edge->[1] )->rank
775 if $self->reading( $edge->[1] )->has_rank;
776 if( defined $rank0 && defined $rank1 && $rank1 - $rank0 > 1 ) {
777 $variables->{'minlen'} = $rank1 - $rank0;
780 # Add the calculated edge weights
781 # if( exists $weighted->{$edge->[0]}
782 # && $weighted->{$edge->[0]} eq $edge->[1] ) {
783 # # $variables->{'color'} = 'red';
784 # $variables->{'weight'} = 3.0;
787 # EXPERIMENTAL: make edge width reflect no. of witnesses
788 my $extrawidth = scalar( $self->path_witnesses( $edge ) ) * 0.2;
789 $variables->{'penwidth'} = $extrawidth + 0.8; # gives 1 for a single wit
791 my $varopts = _dot_attr_string( $variables );
792 $dot .= sprintf( "\t\"%s\" -> \"%s\" %s;\n",
793 $edge->[0], $edge->[1], $varopts );
794 } elsif( $used{$edge->[0]} ) {
795 $subend{$edge->[0]} = $edge->[1];
796 } elsif( $used{$edge->[1]} ) {
797 $substart{$edge->[1]} = $edge->[0];
800 # Add substitute start and end edges if necessary
801 foreach my $node ( keys %substart ) {
802 my $witstr = $self->_path_display_label ( $self->path_witnesses( $substart{$node}, $node ) );
803 my $variables = { %edge_attrs, 'label' => $witstr };
804 my $nrdg = $self->reading( $node );
805 if( $nrdg->has_rank && $nrdg->rank > $startrank ) {
806 # Substart is actually one lower than $startrank
807 $variables->{'minlen'} = $nrdg->rank - ( $startrank - 1 );
809 my $varopts = _dot_attr_string( $variables );
810 $dot .= "\t\"__SUBSTART__\" -> \"$node\" $varopts;\n";
812 foreach my $node ( keys %subend ) {
813 my $witstr = $self->_path_display_label ( $self->path_witnesses( $node, $subend{$node} ) );
814 my $variables = { %edge_attrs, 'label' => $witstr };
815 my $varopts = _dot_attr_string( $variables );
816 $dot .= "\t\"$node\" -> \"__SUBEND__\" $varopts;\n";
819 if( $STRAIGHTENHACK ) {
820 my $endlabel = $endrank ? '__SUBEND__' : '__END__';
821 $dot .= "\t\"$endlabel\" -> \"#SILENT#\" [ color=white,penwidth=0 ];\n";
828 sub _dot_attr_string {
831 foreach my $k ( sort keys %$hash ) {
833 push( @attrs, $k.'="'.$v.'"' );
835 return( '[ ' . join( ', ', @attrs ) . ' ]' );
838 sub _add_edge_weights {
840 # Walk the graph from START to END, choosing the successor node with
841 # the largest number of witness paths each time.
843 my $curr = $self->start->id;
844 my $ranked = $self->end->has_rank;
845 while( $curr ne $self->end->id ) {
846 my $rank = $ranked ? $self->reading( $curr )->rank : 0;
847 my @succ = sort { $self->path_witnesses( $curr, $a )
848 <=> $self->path_witnesses( $curr, $b ) }
849 $self->sequence->successors( $curr );
850 my $next = pop @succ;
851 my $nextrank = $ranked ? $self->reading( $next )->rank : 0;
852 # Try to avoid lacunae in the weighted path.
854 ( $self->reading( $next )->is_lacuna ||
855 $nextrank - $rank > 1 ) ){
858 $weighted->{$curr} = $next;
864 =head2 path_witnesses( $edge )
866 Returns the list of sigils whose witnesses are associated with the given edge.
867 The edge can be passed as either an array or an arrayref of ( $source, $target ).
872 my( $self, @edge ) = @_;
873 # If edge is an arrayref, cope.
874 if( @edge == 1 && ref( $edge[0] ) eq 'ARRAY' ) {
878 my @wits = keys %{$self->sequence->get_edge_attributes( @edge )};
882 # Helper function. Make a display label for the given witnesses, showing a.c.
883 # witnesses only where the main witness is not also in the list.
884 sub _path_display_label {
887 map { $wits{$_} = 1 } @_;
889 # If an a.c. wit is listed, remove it if the main wit is also listed.
890 # Otherwise keep it for explicit listing.
891 my $aclabel = $self->ac_label;
893 foreach my $w ( sort keys %wits ) {
894 if( $w =~ /^(.*)\Q$aclabel\E$/ ) {
895 if( exists $wits{$1} ) {
898 push( @disp_ac, $w );
903 # See if we are in a majority situation.
904 my $maj = scalar( $self->tradition->witnesses ) * 0.6;
905 $maj = $maj > 5 ? $maj : 5;
906 if( scalar keys %wits > $maj ) {
907 unshift( @disp_ac, 'majority' );
908 return join( ', ', @disp_ac );
910 return join( ', ', sort keys %wits );
914 =head2 readings_at_rank( $rank )
916 Returns a list of readings at a given rank, taken from the alignment table.
920 sub readings_at_rank {
921 my( $self, $rank ) = @_;
922 my $table = $self->alignment_table;
923 # Table rank is real rank - 1.
924 my @elements = map { $_->{'tokens'}->[$rank-1] } @{$table->{'alignment'}};
926 foreach my $e ( @elements ) {
927 next unless ref( $e ) eq 'HASH';
928 next unless exists $e->{'t'};
929 $readings{$e->{'t'}->id} = $e->{'t'};
931 return values %readings;
936 Returns a GraphML representation of the collation. The GraphML will contain
937 two graphs. The first expresses the attributes of the readings and the witness
938 paths that link them; the second expresses the relationships that link the
939 readings. This is the native transfer format for a tradition.
948 my $datafile = 't/data/florilegium_tei_ps.xml';
949 my $tradition = Text::Tradition->new( 'input' => 'TEI',
954 ok( $tradition, "Got a tradition object" );
955 is( scalar $tradition->witnesses, 13, "Found all witnesses" );
956 ok( $tradition->collation, "Tradition has a collation" );
958 my $c = $tradition->collation;
959 is( scalar $c->readings, $READINGS, "Collation has all readings" );
960 is( scalar $c->paths, $PATHS, "Collation has all paths" );
961 is( scalar $c->relationships, 0, "Collation has all relationships" );
963 # Add a few relationships
964 $c->add_relationship( 'w123', 'w125', { 'type' => 'collated' } );
965 $c->add_relationship( 'w193', 'w196', { 'type' => 'collated' } );
966 $c->add_relationship( 'w257', 'w262', { 'type' => 'transposition' } );
968 # Now write it to GraphML and parse it again.
970 my $graphml = $c->as_graphml;
971 my $st = Text::Tradition->new( 'input' => 'Self', 'string' => $graphml );
972 is( scalar $st->collation->readings, $READINGS, "Reparsed collation has all readings" );
973 is( scalar $st->collation->paths, $PATHS, "Reparsed collation has all paths" );
974 is( scalar $st->collation->relationships, 3, "Reparsed collation has new relationships" );
976 # Now add a stemma, write to GraphML, and parse again.
977 my $stemma = $tradition->add_stemma( 'dotfile' => 't/data/florilegium.dot' );
978 is( ref( $stemma ), 'Text::Tradition::Stemma', "Parsed dotfile into stemma" );
979 is( $tradition->stemmata, 1, "Tradition now has the stemma" );
980 $graphml = $c->as_graphml;
981 like( $graphml, qr/digraph/, "Digraph declaration exists in GraphML" );
988 my( $self, $options ) = @_;
989 $self->calculate_ranks unless $self->_graphcalc_done;
991 my $start = $options->{'from'}
992 ? $self->reading( $options->{'from'} ) : $self->start;
993 my $end = $options->{'to'}
994 ? $self->reading( $options->{'to'} ) : $self->end;
995 if( $start->has_rank && $end->has_rank && $end->rank < $start->rank ) {
996 throw( 'Start node must be before end node' );
998 # The readings need to be ranked for this to work.
999 $start = $self->start unless $start->has_rank;
1000 $end = $self->end unless $end->has_rank;
1002 unless( $start eq $self->start ) {
1003 $rankoffset = $start->rank - 1;
1008 my $graphml_ns = 'http://graphml.graphdrawing.org/xmlns';
1009 my $xsi_ns = 'http://www.w3.org/2001/XMLSchema-instance';
1010 my $graphml_schema = 'http://graphml.graphdrawing.org/xmlns ' .
1011 'http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd';
1013 # Create the document and root node
1014 my $graphml = XML::LibXML->createDocument( "1.0", "UTF-8" );
1015 my $root = $graphml->createElementNS( $graphml_ns, 'graphml' );
1016 $graphml->setDocumentElement( $root );
1017 $root->setNamespace( $xsi_ns, 'xsi', 0 );
1018 $root->setAttributeNS( $xsi_ns, 'schemaLocation', $graphml_schema );
1020 # List of attribute types to save on our objects and their corresponding
1025 'Bool' => 'boolean',
1026 'ReadingID' => 'string',
1027 'RelationshipType' => 'string',
1028 'RelationshipScope' => 'string',
1031 # List of attribute names *not* to save on our objects.
1032 # We will also not save any attribute beginning with _.
1034 map { $skipsave{$_} = 1 } qw/ cached_svg /;
1036 # Add the data keys for the graph. Include an extra key 'version' for the
1037 # GraphML output version.
1038 my %graph_data_keys;
1040 my %graph_attributes = ( 'version' => 'string' );
1041 # Graph attributes include those of Tradition and those of Collation.
1043 my $tmeta = $self->tradition->meta;
1044 my $cmeta = $self->meta;
1045 map { $gattr_from{$_->name} = 'Tradition' } $tmeta->get_all_attributes;
1046 map { $gattr_from{$_->name} = 'Collation' } $cmeta->get_all_attributes;
1047 foreach my $attr ( ( $tmeta->get_all_attributes, $cmeta->get_all_attributes ) ) {
1048 next if $attr->name =~ /^_/;
1049 next if $skipsave{$attr->name};
1050 next unless $save_types{$attr->type_constraint->name};
1051 $graph_attributes{$attr->name} = $save_types{$attr->type_constraint->name};
1053 # Extra custom key for the tradition stemma(ta)
1054 $graph_attributes{'stemmata'} = 'string';
1056 foreach my $datum ( sort keys %graph_attributes ) {
1057 $graph_data_keys{$datum} = 'dg'.$gdi++;
1058 my $key = $root->addNewChild( $graphml_ns, 'key' );
1059 $key->setAttribute( 'attr.name', $datum );
1060 $key->setAttribute( 'attr.type', $graph_attributes{$datum} );
1061 $key->setAttribute( 'for', 'graph' );
1062 $key->setAttribute( 'id', $graph_data_keys{$datum} );
1065 # Add the data keys for reading nodes
1066 my %reading_attributes;
1067 my $rmeta = Text::Tradition::Collation::Reading->meta;
1068 foreach my $attr( $rmeta->get_all_attributes ) {
1069 next if $attr->name =~ /^_/;
1070 next if $skipsave{$attr->name};
1071 next unless $save_types{$attr->type_constraint->name};
1072 $reading_attributes{$attr->name} = $save_types{$attr->type_constraint->name};
1074 # Extra custom key for the reading morphology
1075 $reading_attributes{'lexemes'} = 'string';
1079 foreach my $datum ( sort keys %reading_attributes ) {
1080 $node_data_keys{$datum} = 'dn'.$ndi++;
1081 my $key = $root->addNewChild( $graphml_ns, 'key' );
1082 $key->setAttribute( 'attr.name', $datum );
1083 $key->setAttribute( 'attr.type', $reading_attributes{$datum} );
1084 $key->setAttribute( 'for', 'node' );
1085 $key->setAttribute( 'id', $node_data_keys{$datum} );
1088 # Add the data keys for edges, that is, paths and relationships. Path
1089 # data does not come from a Moose class so is here manually.
1092 my %edge_attributes = (
1093 witness => 'string', # ID/label for a path
1094 extra => 'boolean', # Path key
1096 my @path_attributes = keys %edge_attributes; # track our manual additions
1097 my $pmeta = Text::Tradition::Collation::Relationship->meta;
1098 foreach my $attr( $pmeta->get_all_attributes ) {
1099 next if $attr->name =~ /^_/;
1100 next if $skipsave{$attr->name};
1101 next unless $save_types{$attr->type_constraint->name};
1102 $edge_attributes{$attr->name} = $save_types{$attr->type_constraint->name};
1104 foreach my $datum ( sort keys %edge_attributes ) {
1105 $edge_data_keys{$datum} = 'de'.$edi++;
1106 my $key = $root->addNewChild( $graphml_ns, 'key' );
1107 $key->setAttribute( 'attr.name', $datum );
1108 $key->setAttribute( 'attr.type', $edge_attributes{$datum} );
1109 $key->setAttribute( 'for', 'edge' );
1110 $key->setAttribute( 'id', $edge_data_keys{$datum} );
1113 # Add the collation graph itself. First, sanitize the name to a valid XML ID.
1114 my $xmlidname = $self->tradition->name;
1115 $xmlidname =~ s/(?!$xml10_namechar_rx)./_/g;
1116 if( $xmlidname !~ /^$xml10_namestartchar_rx/ ) {
1117 $xmlidname = '_'.$xmlidname;
1119 my $sgraph = $root->addNewChild( $graphml_ns, 'graph' );
1120 $sgraph->setAttribute( 'edgedefault', 'directed' );
1121 $sgraph->setAttribute( 'id', $xmlidname );
1122 $sgraph->setAttribute( 'parse.edgeids', 'canonical' );
1123 $sgraph->setAttribute( 'parse.edges', 0 ); # fill in later
1124 $sgraph->setAttribute( 'parse.nodeids', 'canonical' );
1125 $sgraph->setAttribute( 'parse.nodes', 0 ); # fill in later
1126 $sgraph->setAttribute( 'parse.order', 'nodesfirst' );
1128 # Tradition/collation attribute data
1129 foreach my $datum ( keys %graph_attributes ) {
1131 if( $datum eq 'version' ) {
1133 } elsif( $datum eq 'stemmata' ) {
1135 map { push( @stemstrs, $_->editable( {linesep => ''} ) ) }
1136 $self->tradition->stemmata;
1137 $value = join( "\n", @stemstrs );
1138 } elsif( $gattr_from{$datum} eq 'Tradition' ) {
1139 $value = $self->tradition->$datum;
1141 $value = $self->$datum;
1143 _add_graphml_data( $sgraph, $graph_data_keys{$datum}, $value );
1148 # Add our readings to the graph
1149 foreach my $n ( sort { $a->id cmp $b->id } $self->readings ) {
1150 next if $n->has_rank && $n ne $self->start && $n ne $self->end &&
1151 ( $n->rank < $start->rank || $n->rank > $end->rank );
1152 $use_readings{$n->id} = 1;
1153 # Add to the main graph
1154 my $node_el = $sgraph->addNewChild( $graphml_ns, 'node' );
1155 my $node_xmlid = 'n' . $node_ctr++;
1156 $node_hash{ $n->id } = $node_xmlid;
1157 $node_el->setAttribute( 'id', $node_xmlid );
1158 foreach my $d ( keys %reading_attributes ) {
1160 # Custom serialization
1161 if( $d eq 'lexemes' ) {
1162 # If nval is a true value, we have lexemes so we need to
1163 # serialize them. Otherwise set nval to undef so that the
1164 # key is excluded from this reading.
1165 $nval = $nval ? $n->_serialize_lexemes : undef;
1166 } elsif( $d eq 'normal_form' && $n->normal_form eq $n->text ) {
1169 if( $rankoffset && $d eq 'rank' && $n ne $self->start ) {
1170 # Adjust the ranks within the subgraph.
1171 $nval = $n eq $self->end ? $end->rank - $rankoffset + 1
1172 : $nval - $rankoffset;
1174 _add_graphml_data( $node_el, $node_data_keys{$d}, $nval )
1179 # Add the path edges to the sequence graph
1181 foreach my $e ( sort { $a->[0] cmp $b->[0] } $self->sequence->edges() ) {
1182 # We add an edge in the graphml for every witness in $e.
1183 next unless( $use_readings{$e->[0]} || $use_readings{$e->[1]} );
1184 my @edge_wits = sort $self->path_witnesses( $e );
1185 $e->[0] = $self->start->id unless $use_readings{$e->[0]};
1186 $e->[1] = $self->end->id unless $use_readings{$e->[1]};
1187 # Skip any path from start to end; that witness is not in the subgraph.
1188 next if ( $e->[0] eq $self->start->id && $e->[1] eq $self->end->id );
1189 foreach my $wit ( @edge_wits ) {
1190 my( $id, $from, $to ) = ( 'e'.$edge_ctr++,
1191 $node_hash{ $e->[0] },
1192 $node_hash{ $e->[1] } );
1193 my $edge_el = $sgraph->addNewChild( $graphml_ns, 'edge' );
1194 $edge_el->setAttribute( 'source', $from );
1195 $edge_el->setAttribute( 'target', $to );
1196 $edge_el->setAttribute( 'id', $id );
1198 # It's a witness path, so add the witness
1200 my $key = $edge_data_keys{'witness'};
1201 # Is this an ante-corr witness?
1202 my $aclabel = $self->ac_label;
1203 if( $wit =~ /^(.*)\Q$aclabel\E$/ ) {
1204 # Keep the base witness
1206 # ...and record that this is an 'extra' reading path
1207 _add_graphml_data( $edge_el, $edge_data_keys{'extra'}, $aclabel );
1209 _add_graphml_data( $edge_el, $edge_data_keys{'witness'}, $base );
1213 # Report the actual number of nodes and edges that went in
1214 $sgraph->setAttribute( 'parse.edges', $edge_ctr );
1215 $sgraph->setAttribute( 'parse.nodes', $node_ctr );
1217 # Add the relationship graph to the XML
1218 map { delete $edge_data_keys{$_} } @path_attributes;
1219 $self->relations->_as_graphml( $graphml_ns, $root, \%node_hash,
1220 $node_data_keys{'id'}, \%edge_data_keys );
1222 # Save and return the thing
1223 my $result = decode_utf8( $graphml->toString(1) );
1227 sub _add_graphml_data {
1228 my( $el, $key, $value ) = @_;
1229 return unless defined $value;
1230 my $data_el = $el->addNewChild( $el->namespaceURI, 'data' );
1231 $data_el->setAttribute( 'key', $key );
1232 $data_el->appendText( $value );
1237 Returns a CSV alignment table representation of the collation graph, one
1238 row per witness (or witness uncorrected.)
1244 my $table = $self->alignment_table;
1245 my $csv = Text::CSV->new( { binary => 1, quote_null => 0 } );
1247 # Make the header row
1248 $csv->combine( map { $_->{'witness'} } @{$table->{'alignment'}} );
1249 push( @result, decode_utf8( $csv->string ) );
1250 # Make the rest of the rows
1251 foreach my $idx ( 0 .. $table->{'length'} - 1 ) {
1252 my @rowobjs = map { $_->{'tokens'}->[$idx] } @{$table->{'alignment'}};
1253 my @row = map { $_ ? $_->{'t'}->text : $_ } @rowobjs;
1254 $csv->combine( @row );
1255 push( @result, decode_utf8( $csv->string ) );
1257 return join( "\n", @result );
1260 =head2 alignment_table( $use_refs, $include_witnesses )
1262 Return a reference to an alignment table, in a slightly enhanced CollateX
1263 format which looks like this:
1265 $table = { alignment => [ { witness => "SIGIL",
1266 tokens => [ { t => "TEXT" }, ... ] },
1267 { witness => "SIG2",
1268 tokens => [ { t => "TEXT" }, ... ] },
1270 length => TEXTLEN };
1272 If $use_refs is set to 1, the reading object is returned in the table
1273 instead of READINGTEXT; if not, the text of the reading is returned.
1275 If $include_witnesses is set to a hashref, only the witnesses whose sigil
1276 keys have a true hash value will be included.
1280 sub alignment_table {
1282 $self->calculate_ranks() unless $self->_graphcalc_done;
1283 return $self->cached_table if $self->has_cached_table;
1285 # Make sure we can do this
1286 throw( "Need a linear graph in order to make an alignment table" )
1287 unless $self->linear;
1288 $self->calculate_ranks unless $self->end->has_rank;
1290 my $table = { 'alignment' => [], 'length' => $self->end->rank - 1 };
1291 my @all_pos = ( 1 .. $self->end->rank - 1 );
1292 foreach my $wit ( sort { $a->sigil cmp $b->sigil } $self->tradition->witnesses ) {
1293 # say STDERR "Making witness row(s) for " . $wit->sigil;
1294 my @wit_path = $self->reading_sequence( $self->start, $self->end, $wit->sigil );
1295 my @row = _make_witness_row( \@wit_path, \@all_pos );
1296 push( @{$table->{'alignment'}},
1297 { 'witness' => $wit->sigil, 'tokens' => \@row } );
1298 if( $wit->is_layered ) {
1299 my @wit_ac_path = $self->reading_sequence( $self->start, $self->end,
1300 $wit->sigil.$self->ac_label );
1301 my @ac_row = _make_witness_row( \@wit_ac_path, \@all_pos );
1302 push( @{$table->{'alignment'}},
1303 { 'witness' => $wit->sigil.$self->ac_label, 'tokens' => \@ac_row } );
1306 $self->cached_table( $table );
1310 sub _make_witness_row {
1311 my( $path, $positions ) = @_;
1313 map { $char_hash{$_} = undef } @$positions;
1315 foreach my $rdg ( @$path ) {
1316 my $rtext = $rdg->text;
1317 $rtext = '#LACUNA#' if $rdg->is_lacuna;
1318 say STDERR "rank " . $rdg->rank if $debug;
1319 # say STDERR "No rank for " . $rdg->id unless defined $rdg->rank;
1320 $char_hash{$rdg->rank} = { 't' => $rdg };
1322 my @row = map { $char_hash{$_} } @$positions;
1323 # Fill in lacuna markers for undef spots in the row
1324 my $last_el = shift @row;
1325 my @filled_row = ( $last_el );
1326 foreach my $el ( @row ) {
1327 # If we are using node reference, make the lacuna node appear many times
1328 # in the table. If not, use the lacuna tag.
1329 if( $last_el && $last_el->{'t'}->is_lacuna && !defined $el ) {
1332 push( @filled_row, $el );
1338 =head1 NAVIGATION METHODS
1340 =head2 reading_sequence( $first, $last, $sigil, $backup )
1342 Returns the ordered list of readings, starting with $first and ending
1343 with $last, for the witness given in $sigil. If a $backup sigil is
1344 specified (e.g. when walking a layered witness), it will be used wherever
1345 no $sigil path exists. If there is a base text reading, that will be
1346 used wherever no path exists for $sigil or $backup.
1350 # TODO Think about returning some lazy-eval iterator.
1351 # TODO Get rid of backup; we should know from what witness is whether we need it.
1353 sub reading_sequence {
1354 my( $self, $start, $end, $witness ) = @_;
1356 $witness = $self->baselabel unless $witness;
1357 my @readings = ( $start );
1360 while( $n && $n->id ne $end->id ) {
1361 if( exists( $seen{$n->id} ) ) {
1362 throw( "Detected loop for $witness at " . $n->id );
1366 my $next = $self->next_reading( $n, $witness );
1368 throw( "Did not find any path for $witness from reading " . $n->id );
1370 push( @readings, $next );
1373 # Check that the last reading is our end reading.
1374 my $last = $readings[$#readings];
1375 throw( "Last reading found from " . $start->text .
1376 " for witness $witness is not the end!" ) # TODO do we get this far?
1377 unless $last->id eq $end->id;
1382 =head2 next_reading( $reading, $sigil );
1384 Returns the reading that follows the given reading along the given witness
1390 # Return the successor via the corresponding path.
1392 my $answer = $self->_find_linked_reading( 'next', @_ );
1393 return undef unless $answer;
1394 return $self->reading( $answer );
1397 =head2 prior_reading( $reading, $sigil )
1399 Returns the reading that precedes the given reading along the given witness
1405 # Return the predecessor via the corresponding path.
1407 my $answer = $self->_find_linked_reading( 'prior', @_ );
1408 return $self->reading( $answer );
1411 sub _find_linked_reading {
1412 my( $self, $direction, $node, $path ) = @_;
1414 # Get a backup if we are dealing with a layered witness
1416 my $aclabel = $self->ac_label;
1417 if( $path && $path =~ /^(.*)\Q$aclabel\E$/ ) {
1421 my @linked_paths = $direction eq 'next'
1422 ? $self->sequence->edges_from( $node )
1423 : $self->sequence->edges_to( $node );
1424 return undef unless scalar( @linked_paths );
1426 # We have to find the linked path that contains all of the
1427 # witnesses supplied in $path.
1428 my( @path_wits, @alt_path_wits );
1429 @path_wits = sort( $self->_witnesses_of_label( $path ) ) if $path;
1430 @alt_path_wits = sort( $self->_witnesses_of_label( $alt_path ) ) if $alt_path;
1433 foreach my $le ( @linked_paths ) {
1434 if( $self->sequence->has_edge_attribute( @$le, $self->baselabel ) ) {
1437 my @le_wits = sort $self->path_witnesses( $le );
1438 if( _is_within( \@path_wits, \@le_wits ) ) {
1439 # This is the right path.
1440 return $direction eq 'next' ? $le->[1] : $le->[0];
1441 } elsif( _is_within( \@alt_path_wits, \@le_wits ) ) {
1445 # Got this far? Return the alternate path if it exists.
1446 return $direction eq 'next' ? $alt_le->[1] : $alt_le->[0]
1449 # Got this far? Return the base path if it exists.
1450 return $direction eq 'next' ? $base_le->[1] : $base_le->[0]
1453 # Got this far? We have no appropriate path.
1454 warn "Could not find $direction node from " . $node->id
1455 . " along path $path";
1461 my( $set1, $set2 ) = @_;
1462 my $ret = @$set1; # will be 0, i.e. false, if set1 is empty
1463 foreach my $el ( @$set1 ) {
1464 $ret = 0 unless grep { /^\Q$el\E$/ } @$set2;
1469 # Return the string that joins together a list of witnesses for
1470 # display on a single path.
1471 sub _witnesses_of_label {
1472 my( $self, $label ) = @_;
1473 my $regex = $self->wit_list_separator;
1474 my @answer = split( /\Q$regex\E/, $label );
1478 =head2 common_readings
1480 Returns the list of common readings in the graph (i.e. those readings that are
1481 shared by all non-lacunose witnesses.)
1485 sub common_readings {
1487 my @common = grep { $_->is_common } $self->readings;
1491 =head2 path_text( $sigil, [, $start, $end ] )
1493 Returns the text of a witness (plus its backup, if we are using a layer)
1494 as stored in the collation. The text is returned as a string, where the
1495 individual readings are joined with spaces and the meta-readings (e.g.
1496 lacunae) are omitted. Optional specification of $start and $end allows
1497 the generation of a subset of the witness text.
1502 my( $self, $wit, $start, $end ) = @_;
1503 $start = $self->start unless $start;
1504 $end = $self->end unless $end;
1505 my @path = grep { !$_->is_meta } $self->reading_sequence( $start, $end, $wit );
1508 foreach my $r ( @path ) {
1509 unless ( $r->join_prior || !$last || $last->join_next ) {
1512 $pathtext .= $r->text;
1518 =head1 INITIALIZATION METHODS
1520 These are mostly for use by parsers.
1522 =head2 make_witness_path( $witness )
1524 Link the array of readings contained in $witness->path (and in
1525 $witness->uncorrected_path if it exists) into collation paths.
1526 Clear out the arrays when finished.
1528 =head2 make_witness_paths
1530 Call make_witness_path for all witnesses in the tradition.
1534 # For use when a collation is constructed from a base text and an apparatus.
1535 # We have the sequences of readings and just need to add path edges.
1536 # When we are done, clear out the witness path attributes, as they are no
1538 # TODO Find a way to replace the witness path attributes with encapsulated functions?
1540 sub make_witness_paths {
1542 foreach my $wit ( $self->tradition->witnesses ) {
1543 # say STDERR "Making path for " . $wit->sigil;
1544 $self->make_witness_path( $wit );
1548 sub make_witness_path {
1549 my( $self, $wit ) = @_;
1550 my @chain = @{$wit->path};
1551 my $sig = $wit->sigil;
1552 # Add start and end if necessary
1553 unshift( @chain, $self->start ) unless $chain[0] eq $self->start;
1554 push( @chain, $self->end ) unless $chain[-1] eq $self->end;
1555 foreach my $idx ( 0 .. $#chain-1 ) {
1556 $self->add_path( $chain[$idx], $chain[$idx+1], $sig );
1558 if( $wit->is_layered ) {
1559 @chain = @{$wit->uncorrected_path};
1560 unshift( @chain, $self->start ) unless $chain[0] eq $self->start;
1561 push( @chain, $self->end ) unless $chain[-1] eq $self->end;
1562 foreach my $idx( 0 .. $#chain-1 ) {
1563 my $source = $chain[$idx];
1564 my $target = $chain[$idx+1];
1565 $self->add_path( $source, $target, $sig.$self->ac_label )
1566 unless $self->has_path( $source, $target, $sig );
1570 $wit->clear_uncorrected_path;
1573 =head2 calculate_ranks
1575 Calculate the reading ranks (that is, their aligned positions relative
1576 to each other) for the graph. This can only be called on linear collations.
1580 use Text::Tradition;
1582 my $cxfile = 't/data/Collatex-16.xml';
1583 my $t = Text::Tradition->new(
1585 'input' => 'CollateX',
1588 my $c = $t->collation;
1591 my $table = $c->alignment_table;
1592 ok( $c->has_cached_table, "Alignment table was cached" );
1593 is( $c->alignment_table, $table, "Cached table returned upon second call" );
1594 $c->calculate_ranks;
1595 is( $c->alignment_table, $table, "Cached table retained with no rank change" );
1596 $c->add_relationship( 'n24', 'n23', { 'type' => 'spelling' } );
1597 isnt( $c->alignment_table, $table, "Alignment table changed after relationship add" );
1603 sub calculate_ranks {
1605 # Save the existing ranks, in case we need to invalidate the cached SVG.
1607 map { $existing_ranks{$_} = $_->rank } $self->readings;
1609 # Do the rankings based on the relationship equivalence graph, starting
1610 # with the start node.
1611 my ( $node_ranks, $rank_nodes ) = $self->relations->equivalence_ranks();
1613 # Transfer our rankings from the topological graph to the real one.
1614 foreach my $r ( $self->readings ) {
1615 if( defined $node_ranks->{$self->equivalence( $r->id )} ) {
1616 $r->rank( $node_ranks->{$self->equivalence( $r->id )} );
1618 # Die. Find the last rank we calculated.
1619 my @all_defined = sort { ( $node_ranks->{$self->equivalence( $a->id )}||-1 )
1620 <=> ( $node_ranks->{$self->equivalence( $b->id )}||-1 ) }
1622 my $last = pop @all_defined;
1623 throw( "Ranks not calculated after $last - do you have a cycle in the graph?" );
1626 # Do we need to invalidate the cached data?
1627 if( $self->has_cached_svg || $self->has_cached_table ) {
1628 foreach my $r ( $self->readings ) {
1629 next if defined( $existing_ranks{$r} )
1630 && $existing_ranks{$r} == $r->rank;
1631 # Something has changed, so clear the cache
1632 $self->_clear_cache;
1633 # ...and recalculate the common readings.
1634 $self->calculate_common_readings();
1638 # The graph calculation information is now up to date.
1639 $self->_graphcalc_done(1);
1644 $self->wipe_svg if $self->has_cached_svg;
1645 $self->wipe_table if $self->has_cached_table;
1649 =head2 flatten_ranks
1651 A convenience method for parsing collation data. Searches the graph for readings
1652 with the same text at the same rank, and merges any that are found.
1658 my %unique_rank_rdg;
1660 foreach my $rdg ( $self->readings ) {
1661 next unless $rdg->has_rank;
1662 my $key = $rdg->rank . "||" . $rdg->text;
1663 if( exists $unique_rank_rdg{$key} ) {
1664 # Make sure they don't have different grammatical forms
1665 my $ur = $unique_rank_rdg{$key};
1666 if( $rdg->disambiguated && $ur->disambiguated ) {
1667 my $rform = join( '//', map { $_->form->to_string } $rdg->lexemes );
1668 my $uform = join( '//', map { $_->form->to_string } $ur->lexemes );
1669 next unless $rform eq $uform;
1670 } elsif( $rdg->disambiguated xor $ur->disambiguated ) {
1674 #say STDERR "Combining readings at same rank: $key";
1676 $self->merge_readings( $unique_rank_rdg{$key}, $rdg );
1677 # TODO see if this now makes a common point.
1679 $unique_rank_rdg{$key} = $rdg;
1682 # If we merged readings, the ranks are still fine but the alignment
1683 # table is wrong. Wipe it.
1684 $self->wipe_table() if $changed;
1688 =head2 calculate_common_readings
1690 Goes through the graph identifying the readings that appear in every witness
1691 (apart from those with lacunae at that spot.) Marks them as common and returns
1696 use Text::Tradition;
1698 my $cxfile = 't/data/Collatex-16.xml';
1699 my $t = Text::Tradition->new(
1701 'input' => 'CollateX',
1704 my $c = $t->collation;
1706 my @common = $c->calculate_common_readings();
1707 is( scalar @common, 8, "Found correct number of common readings" );
1708 my @marked = sort $c->common_readings();
1709 is( scalar @common, 8, "All common readings got marked as such" );
1710 my @expected = qw/ n1 n11 n16 n19 n20 n5 n6 n7 /;
1711 is_deeply( \@marked, \@expected, "Found correct list of common readings" );
1717 sub calculate_common_readings {
1720 map { $_->is_common( 0 ) } $self->readings;
1721 # Implicitly calls calculate_ranks
1722 my $table = $self->alignment_table;
1723 foreach my $idx ( 0 .. $table->{'length'} - 1 ) {
1724 my @row = map { $_->{'tokens'}->[$idx]
1725 ? $_->{'tokens'}->[$idx]->{'t'} : '' }
1726 @{$table->{'alignment'}};
1728 foreach my $r ( @row ) {
1730 $hash{$r->id} = $r unless $r->is_meta;
1732 $hash{'UNDEF'} = $r;
1735 if( keys %hash == 1 && !exists $hash{'UNDEF'} ) {
1736 my( $r ) = values %hash;
1738 push( @common, $r );
1744 =head2 text_from_paths
1746 Calculate the text array for all witnesses from the path, for later consistency
1747 checking. Only to be used if there is no non-graph-based way to know the
1752 sub text_from_paths {
1754 foreach my $wit ( $self->tradition->witnesses ) {
1755 my @readings = $self->reading_sequence( $self->start, $self->end, $wit->sigil );
1757 foreach my $r ( @readings ) {
1758 next if $r->is_meta;
1759 push( @text, $r->text );
1761 $wit->text( \@text );
1762 if( $wit->is_layered ) {
1763 my @ucrdgs = $self->reading_sequence( $self->start, $self->end,
1764 $wit->sigil.$self->ac_label );
1766 foreach my $r ( @ucrdgs ) {
1767 next if $r->is_meta;
1768 push( @uctext, $r->text );
1770 $wit->layertext( \@uctext );
1775 =head1 UTILITY FUNCTIONS
1777 =head2 common_predecessor( $reading_a, $reading_b )
1779 Find the last reading that occurs in sequence before both the given readings.
1780 At the very least this should be $self->start.
1782 =head2 common_successor( $reading_a, $reading_b )
1784 Find the first reading that occurs in sequence after both the given readings.
1785 At the very least this should be $self->end.
1789 use Text::Tradition;
1791 my $cxfile = 't/data/Collatex-16.xml';
1792 my $t = Text::Tradition->new(
1794 'input' => 'CollateX',
1797 my $c = $t->collation;
1799 is( $c->common_predecessor( 'n24', 'n23' )->id,
1800 'n20', "Found correct common predecessor" );
1801 is( $c->common_successor( 'n24', 'n23' )->id,
1802 '__END__', "Found correct common successor" );
1804 is( $c->common_predecessor( 'n19', 'n17' )->id,
1805 'n16', "Found correct common predecessor for readings on same path" );
1806 is( $c->common_successor( 'n21', 'n10' )->id,
1807 '__END__', "Found correct common successor for readings on same path" );
1813 ## Return the closest reading that is a predecessor of both the given readings.
1814 sub common_predecessor {
1816 my( $r1, $r2 ) = $self->_objectify_args( @_ );
1817 return $self->_common_in_path( $r1, $r2, 'predecessors' );
1820 sub common_successor {
1822 my( $r1, $r2 ) = $self->_objectify_args( @_ );
1823 return $self->_common_in_path( $r1, $r2, 'successors' );
1827 # TODO think about how to do this without ranks...
1828 sub _common_in_path {
1829 my( $self, $r1, $r2, $dir ) = @_;
1830 my $iter = $self->end->rank;
1832 my @last_r1 = ( $r1 );
1833 my @last_r2 = ( $r2 );
1834 # my %all_seen = ( $r1 => 'r1', $r2 => 'r2' );
1836 # say STDERR "Finding common $dir for $r1, $r2";
1837 while( !@candidates ) {
1838 last unless $iter--; # Avoid looping infinitely
1839 # Iterate separately down the graph from r1 and r2
1840 my( @new_lc1, @new_lc2 );
1841 foreach my $lc ( @last_r1 ) {
1842 foreach my $p ( $lc->$dir ) {
1843 if( $all_seen{$p->id} && $all_seen{$p->id} ne 'r1' ) {
1844 # say STDERR "Path candidate $p from $lc";
1845 push( @candidates, $p );
1846 } elsif( !$all_seen{$p->id} ) {
1847 $all_seen{$p->id} = 'r1';
1848 push( @new_lc1, $p );
1852 foreach my $lc ( @last_r2 ) {
1853 foreach my $p ( $lc->$dir ) {
1854 if( $all_seen{$p->id} && $all_seen{$p->id} ne 'r2' ) {
1855 # say STDERR "Path candidate $p from $lc";
1856 push( @candidates, $p );
1857 } elsif( !$all_seen{$p->id} ) {
1858 $all_seen{$p->id} = 'r2';
1859 push( @new_lc2, $p );
1863 @last_r1 = @new_lc1;
1864 @last_r2 = @new_lc2;
1866 my @answer = sort { $a->rank <=> $b->rank } @candidates;
1867 return $dir eq 'predecessors' ? pop( @answer ) : shift ( @answer );
1871 Text::Tradition::Error->throw(
1872 'ident' => 'Collation error',
1878 __PACKAGE__->meta->make_immutable;
1882 This package is free software and is provided "as is" without express
1883 or implied warranty. You can redistribute it and/or modify it under
1884 the same terms as Perl itself.
1888 Tara L Andrews E<lt>aurum@cpan.orgE<gt>