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1 | package Text::Tradition::Parser::TEI; |
2 | |
3 | use strict; |
4 | use warnings; |
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5 | use Text::Tradition::Parser::Util qw( collate_variants ); |
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6 | use XML::LibXML; |
7 | use XML::LibXML::XPathContext; |
8 | |
9 | =head1 NAME |
10 | |
11 | Text::Tradition::Parser::TEI |
12 | |
13 | =head1 DESCRIPTION |
14 | |
15 | Parser module for Text::Tradition, given a TEI parallel-segmentation |
16 | file that describes a text and its variants. |
17 | |
18 | =head1 METHODS |
19 | |
20 | =over |
21 | |
22 | =item B<parse> |
23 | |
24 | parse( $tei_string ); |
25 | |
26 | Takes an initialized tradition and a string containing the TEI; |
27 | creates the appropriate nodes and edges on the graph, as well as |
28 | the appropriate witness objects. |
29 | |
30 | =cut |
31 | |
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32 | my $text = {}; # Hash of arrays, one per eventual witness we find. |
33 | my @common_readings; |
34 | my $substitutions = {}; # Keep track of merged readings |
35 | my $app_anchors = {}; # Track apparatus references |
36 | my $app_ac = {}; # Save a.c. readings |
37 | |
38 | # Create the package variables for tag names. |
39 | |
40 | # Would really like to do this with varname variables, but apparently this |
41 | # is considered a bad idea. The long way round then. |
42 | my( $LISTWIT, $WITNESS, $TEXT, $W, $SEG, $APP, $RDG, $LEM ) |
43 | = ( 'listWit', 'witness', 'text', 'w', 'seg', 'app', 'rdg', 'lem' ); |
44 | sub make_tagnames { |
45 | my( $ns ) = @_; |
46 | if( $ns ) { |
47 | $LISTWIT = "$ns:$LISTWIT"; |
48 | $WITNESS = "$ns:$WITNESS"; |
49 | $TEXT = "$ns:$TEXT"; |
50 | $W = "$ns:$W"; |
51 | $SEG = "$ns:$SEG"; |
52 | $APP = "$ns:$APP"; |
53 | $RDG = "$ns:$RDG"; |
54 | $LEM = "$ns:$LEM"; |
55 | } |
56 | } |
57 | |
58 | # Parse the TEI file. |
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59 | sub parse { |
60 | my( $tradition, $xml_str ) = @_; |
61 | |
62 | # First, parse the XML. |
63 | my $parser = XML::LibXML->new(); |
64 | my $doc = $parser->parse_string( $xml_str ); |
65 | my $tei = $doc->documentElement(); |
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66 | my $xpc = XML::LibXML::XPathContext->new( $tei ); |
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67 | my $ns; |
68 | if( $tei->namespaceURI ) { |
69 | $ns = 'tei'; |
70 | $xpc->registerNs( $ns, $tei->namespaceURI ); |
71 | } |
72 | make_tagnames( $ns ); |
73 | |
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74 | # Then get the witnesses and create the witness objects. |
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75 | foreach my $wit_el ( $xpc->findnodes( "//$LISTWIT/$WITNESS" ) ) { |
76 | my $sig = $wit_el->getAttribute( 'xml:id' ); |
77 | my $source = $wit_el->toString(); |
78 | $tradition->add_witness( sigil => $sig, source => $source ); |
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79 | } |
80 | |
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81 | map { $text->{$_->sigil} = [] } $tradition->witnesses; |
82 | # Look for all word/seg node IDs and note their pre-existence. |
83 | my @attrs = $xpc->findnodes( "//$W|$SEG/attribute::xml:id" ); |
84 | save_preexisting_nodeids( @attrs ); |
85 | |
86 | # Now go through the children of the text element and pull out the |
87 | # actual text. |
88 | foreach my $xml_el ( $xpc->findnodes( "//$TEXT" ) ) { |
89 | foreach my $xn ( $xml_el->childNodes ) { |
90 | _get_readings( $tradition, $xn ); |
91 | } |
92 | } |
93 | # Our $text global now has lists of readings, one per witness. |
94 | # Join them up. |
95 | my $c = $tradition->collation; |
96 | foreach my $sig ( keys %$text ) { |
97 | next if $sig eq 'base'; # Skip base text readings with no witnesses. |
98 | # Determine the list of readings for |
99 | my $sequence = $text->{$sig}; |
100 | my @real_sequence = ( $c->start ); |
101 | push( @$sequence, $c->end ); |
102 | my $source = $c->start; |
103 | foreach( _clean_sequence( $sig, $sequence ) ) { |
104 | my $rdg = _return_rdg( $_ ); |
105 | push( @real_sequence, $rdg ); |
106 | $c->add_path( $source, $rdg, $sig ); |
107 | $source = $rdg; |
108 | } |
109 | $tradition->witness( $sig )->path( \@real_sequence ); |
110 | # See if we need to make an a.c. version of the witness. |
111 | if( exists $app_ac->{$sig} ) { |
112 | my @uncorrected; |
113 | push( @uncorrected, @real_sequence ); |
114 | foreach my $app ( keys %{$app_ac->{$sig}} ) { |
115 | my $start = _return_rdg( $app_anchors->{$app}->{$sig}->{'start'} ); |
116 | my $end = _return_rdg( $app_anchors->{$app}->{$sig}->{'end'} ); |
117 | my @new = map { _return_rdg( $_ ) } @{$app_ac->{$sig}->{$app}}; |
118 | _replace_sequence( \@uncorrected, $start, $end, @new ); |
119 | } |
120 | my $source = $c->start; |
121 | foreach my $rdg ( @uncorrected ) { |
122 | my $has_base = grep { $_->label eq $sig } $source->edges_to( $rdg ); |
123 | if( $rdg ne $c->start && !$has_base ) { |
124 | print STDERR sprintf( "Adding path %s from %s -> %s\n", |
125 | $sig.$c->ac_label, $source->name, $rdg->name ); |
126 | $c->add_path( $source, $rdg, $sig.$c->ac_label ); |
127 | } |
128 | $source = $rdg; |
129 | } |
130 | $tradition->witness( $sig )->uncorrected_path( \@uncorrected ); |
131 | } |
132 | } |
133 | # Delete readings that are no longer part of the graph. |
134 | # TODO think this is useless actually |
135 | foreach ( keys %$substitutions ) { |
136 | $tradition->collation->del_reading( $tradition->collation->reading( $_ ) ); |
137 | } |
138 | $tradition->collation->calculate_positions( @common_readings ); |
139 | } |
140 | |
141 | sub _clean_sequence { |
142 | my( $wit, $sequence ) = @_; |
143 | my @clean_sequence; |
144 | foreach my $rdg ( @$sequence ) { |
145 | if( $rdg =~ /^PH-(.*)$/ ) { |
146 | # It is a placeholder. Keep it only if we need it. |
147 | my $app_id = $1; |
148 | if( exists $app_ac->{$wit}->{$app_id} ) { |
149 | print STDERR "Retaining empty placeholder for $app_id\n"; |
150 | push( @clean_sequence, $rdg ); |
151 | } |
152 | } else { |
153 | push( @clean_sequence, $rdg ); |
154 | } |
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155 | } |
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156 | return @clean_sequence; |
157 | } |
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158 | |
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159 | sub _replace_sequence { |
160 | my( $arr, $start, $end, @new ) = @_; |
161 | my( $start_idx, $end_idx ); |
162 | foreach my $i ( 0 .. $#{$arr} ) { |
163 | $start_idx = $i if( $arr->[$i]->name eq $start ); |
164 | if( $arr->[$i]->name eq $end ) { |
165 | $end_idx = $i; |
166 | last; |
167 | } |
168 | } |
169 | unless( $start_idx && $end_idx ) { |
170 | warn "Could not find start and end"; |
171 | return; |
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172 | } |
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173 | my $length = $end_idx - $start_idx + 1; |
174 | splice( @$arr, $start_idx, $length, @new ); |
175 | } |
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176 | |
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177 | sub _return_rdg { |
178 | my( $rdg ) = @_; |
179 | # If we were passed a reading name, return the name. If we were |
180 | # passed a reading object, return the object. |
181 | my $wantobj = ref( $rdg ) eq 'Text::Tradition::Collation::Reading'; |
182 | my $real = $rdg; |
183 | if( exists $substitutions->{ $wantobj ? $rdg->name : $rdg } ) { |
184 | $real = $substitutions->{ $wantobj ? $rdg->name : $rdg }; |
185 | $real = $real->name unless $wantobj; |
186 | } |
187 | return $real; |
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188 | } |
189 | |
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190 | ## Recursive helper function to help us navigate through nested XML, |
191 | ## picking out the text. $tradition is the tradition, needed for |
192 | ## making readings; $xn is the XML node currently being looked at, |
193 | ## $in_var is a flag to say that we are inside a variant, $ac is a |
194 | ## flag to say that we are inside an ante-correctionem reading, and |
195 | ## @cur_wits is the list of witnesses to which this XML node applies. |
196 | ## Returns the list of readings, if any, created on the run. |
197 | |
198 | { |
199 | my @active_wits; |
200 | my $current_app; |
201 | |
202 | sub _get_readings { |
203 | my( $tradition, $xn, $in_var, $ac, @cur_wits ) = @_; |
204 | @cur_wits = @active_wits unless $in_var; |
205 | |
206 | my @new_readings; |
207 | if( $xn->nodeType == XML_TEXT_NODE ) { |
208 | # Some words, thus make some readings. |
209 | my $str = $xn->data; |
210 | return unless $str =~ /\S/; # skip whitespace-only text nodes |
211 | #print STDERR "Handling text node " . $str . "\n"; |
212 | # Check that all the witnesses we have are active. |
213 | foreach my $c ( @cur_wits ) { |
214 | warn "Could not find $c in active wits" |
215 | unless grep { $c eq $_ } @active_wits; |
216 | } |
217 | $str =~ s/^\s+//; |
218 | my $final = $str =~ s/\s+$//; |
219 | foreach my $w ( split( /\s+/, $str ) ) { |
220 | # For now, skip punctuation. |
221 | next if $w !~ /[[:alnum:]]/; |
222 | my $rdg = make_reading( $tradition->collation, $w ); |
223 | push( @new_readings, $rdg ); |
224 | unless( $in_var ) { |
225 | push( @common_readings, $rdg ); |
226 | $rdg->make_common; |
227 | } |
228 | foreach ( @cur_wits ) { |
229 | warn "Empty wit!" unless $_; |
230 | warn "Empty reading!" unless $rdg; |
231 | push( @{$text->{$_}}, $rdg ) unless $ac; |
232 | } |
233 | } |
234 | } elsif( $xn->nodeName eq 'w' ) { |
235 | # Everything in this tag is one word. Also save any original XML ID. |
236 | #print STDERR "Handling word " . $xn->toString . "\n"; |
237 | # Check that all the witnesses we have are active. |
238 | foreach my $c ( @cur_wits ) { |
239 | warn "Could not find $c in active wits" |
240 | unless grep { $c eq $_ } @active_wits; |
241 | } |
242 | my $xml_id = $xn->getAttribute( 'xml:id' ); |
243 | my $rdg = make_reading( $tradition->collation, $xn->textContent, $xml_id ); |
244 | push( @new_readings, $rdg ); |
245 | unless( $in_var ) { |
246 | push( @common_readings, $rdg ); |
247 | $rdg->make_common; |
248 | } |
249 | foreach( @cur_wits ) { |
250 | warn "Empty wit!" unless $_; |
251 | warn "Empty reading!" unless $rdg; |
252 | push( @{$text->{$_}}, $rdg ) unless $ac; |
253 | } |
254 | } elsif ( $xn->nodeName eq 'app' ) { |
255 | $current_app = $xn->getAttribute( 'xml:id' ); |
256 | # print STDERR "Handling app $current_app\n"; |
257 | # Keep the reading sets in this app. |
258 | my @sets; |
259 | # Recurse through all children (i.e. rdgs) for sets of words. |
260 | foreach ( $xn->childNodes ) { |
261 | my @rdg_set = _get_readings( $tradition, $_, $in_var, $ac, @cur_wits ); |
262 | push( @sets, \@rdg_set ) if @rdg_set; |
263 | } |
264 | # Now collate these sets if we have more than one. |
265 | my $subs = collate_variants( $tradition->collation, @sets ) if @sets > 1; |
266 | map { $substitutions->{$_} = $subs->{$_} } keys %$subs; |
267 | # TODO Look through substitutions to see if we can make anything common now. |
268 | # Return the entire set of unique readings. |
269 | my %unique; |
270 | foreach my $s ( @sets ) { |
271 | map { $unique{$_->name} = $_ } @$s; |
272 | } |
273 | push( @new_readings, values( %unique ) ); |
274 | # Exit the current app. |
275 | $current_app = ''; |
276 | } elsif ( $xn->nodeName eq 'lem' || $xn->nodeName eq 'rdg' ) { |
277 | # Alter the current witnesses and recurse. |
278 | #print STDERR "Handling reading for " . $xn->getAttribute( 'wit' ) . "\n"; |
279 | $ac = $xn->getAttribute( 'type' ) && $xn->getAttribute( 'type' ) eq 'a.c.'; |
280 | my @rdg_wits = get_sigla( $xn ); |
281 | @rdg_wits = ( 'base' ) unless @rdg_wits; # Allow for editorially-supplied readings |
282 | my @words; |
283 | foreach ( $xn->childNodes ) { |
284 | my @rdg_set = _get_readings( $tradition, $_, 1, $ac, @rdg_wits ); |
285 | push( @words, @rdg_set ) if @rdg_set; |
286 | } |
287 | # If we have more than one word in a reading, it should become a segment. |
288 | # $tradition->collation->add_segment( @words ) if @words > 1; |
289 | |
290 | if( $ac ) { |
291 | # Add the reading set to the a.c. readings. |
292 | foreach ( @rdg_wits ) { |
293 | $app_ac->{$_}->{$current_app} = \@words; |
294 | } |
295 | } else { |
296 | # Add the reading set to the app anchors for each witness |
297 | # or put in placeholders for empty p.c. readings |
298 | foreach ( @rdg_wits ) { |
299 | my $start = @words ? $words[0]->name : "PH-$current_app"; |
300 | my $end = @words ? $words[-1]->name : "PH-$current_app"; |
301 | $app_anchors->{$current_app}->{$_}->{'start'} = $start; |
302 | $app_anchors->{$current_app}->{$_}->{'end'} = $end; |
303 | push( @{$text->{$_}}, $start ) unless @words; |
304 | } |
305 | } |
306 | push( @new_readings, @words ); |
307 | } elsif( $xn->nodeName eq 'witStart' ) { |
308 | # Add the relevant wit(s) to the active list. |
309 | #print STDERR "Handling witStart\n"; |
310 | push( @active_wits, @cur_wits ); |
311 | } elsif( $xn->nodeName eq 'witEnd' ) { |
312 | # Take the relevant wit(s) out of the list. |
313 | #print STDERR "Handling witEnd\n"; |
314 | my $regexp = '^(' . join( '|', @cur_wits ) . ')$'; |
315 | @active_wits = grep { $_ !~ /$regexp/ } @active_wits; |
316 | } elsif( $xn->nodeName eq 'witDetail' ) { |
317 | # Ignore these for now. |
318 | return; |
319 | } else { |
320 | # Recurse as if this tag weren't there. |
321 | #print STDERR "Recursing on tag " . $xn->nodeName . "\n"; |
322 | foreach( $xn->childNodes ) { |
323 | push( @new_readings, _get_readings( $tradition, $_, $in_var, $ac, @cur_wits ) ); |
324 | } |
325 | } |
326 | return @new_readings; |
327 | } |
328 | |
329 | } |
330 | |
331 | # Helper to extract a list of witness sigla from a reading element. |
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332 | sub get_sigla { |
333 | my( $rdg ) = @_; |
334 | # Cope if we have been handed a NodeList. There is only |
335 | # one reading here. |
336 | if( ref( $rdg ) eq 'XML::LibXML::NodeList' ) { |
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337 | $rdg = $rdg->shift; |
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338 | } |
339 | |
340 | my @wits; |
341 | if( ref( $rdg ) eq 'XML::LibXML::Element' ) { |
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342 | my $witstr = $rdg->getAttribute( 'wit' ); |
343 | $witstr =~ s/^\s+//; |
344 | $witstr =~ s/\s+$//; |
345 | @wits = split( /\s+/, $witstr ); |
346 | map { $_ =~ s/^\#// } @wits; |
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347 | } |
348 | return @wits; |
349 | } |
350 | |
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351 | # Helper with its counters to actually make the readings. |
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352 | { |
353 | my $word_ctr = 0; |
354 | my %used_nodeids; |
355 | |
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356 | sub save_preexisting_nodeids { |
357 | foreach( @_ ) { |
358 | $used_nodeids{$_->getValue()} = 1; |
359 | } |
360 | } |
361 | |
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362 | sub make_reading { |
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363 | my( $graph, $word, $xml_id ) = @_; |
364 | if( $xml_id ) { |
365 | if( exists $used_nodeids{$xml_id} ) { |
366 | if( $used_nodeids{$xml_id} != 1 ) { |
367 | warn "Already used assigned XML ID somewhere else!"; |
368 | $xml_id = undef; |
369 | } |
370 | } else { |
371 | warn "Undetected pre-existing XML ID"; |
372 | } |
373 | } |
374 | if( !$xml_id ) { |
375 | until( $xml_id ) { |
376 | my $try_id = 'w'.$word_ctr++; |
377 | next if exists $used_nodeids{$try_id}; |
378 | $xml_id = $try_id; |
379 | } |
380 | } |
381 | my $rdg = $graph->add_reading( $xml_id ); |
382 | $rdg->text( $word ); |
383 | $used_nodeids{$xml_id} = $rdg; |
384 | return $rdg; |
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385 | } |
386 | } |
387 | |
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388 | 1; |