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1 | package Text::Tradition::Collation::Reading; |
2 | |
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3 | use Moose; |
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4 | use Moose::Util qw/ does_role apply_all_roles /; |
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5 | use Text::Tradition::Datatypes; |
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6 | use Text::Tradition::Error; |
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7 | use XML::Easy::Syntax qw( $xml10_name_rx $xml10_namestartchar_rx ); |
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8 | use overload '""' => \&_stringify, 'fallback' => 1; |
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9 | |
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10 | # Enable plugin(s) if available |
11 | eval { with 'Text::Tradition::Morphology'; }; |
12 | # Morphology package is not on CPAN, so don't warn of its absence |
13 | # if( $@ ) { |
14 | # warn "Text::Tradition::Morphology not found: $@. Disabling lexeme functionality"; |
15 | # }; |
16 | |
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17 | =head1 NAME |
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18 | |
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19 | Text::Tradition::Collation::Reading - represents a reading (usually a word) |
20 | in a collation. |
21 | |
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22 | =head1 DESCRIPTION |
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23 | |
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24 | Text::Tradition is a library for representation and analysis of collated |
25 | texts, particularly medieval ones. A 'reading' refers to a unit of text, |
26 | usually a word, that appears in one or more witnesses (manuscripts) of the |
27 | tradition; the text of a given witness is composed of a set of readings in |
28 | a particular sequence |
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29 | |
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30 | =head1 METHODS |
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31 | |
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32 | =head2 new |
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33 | |
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34 | Creates a new reading in the given collation with the given attributes. |
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35 | Options include: |
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36 | |
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37 | =over 4 |
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38 | |
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39 | =item collation - The Text::Tradition::Collation object to which this |
40 | reading belongs. Required. |
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41 | |
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42 | =item id - A unique identifier for this reading. Required. |
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43 | |
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44 | =item text - The word or other text of the reading. |
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45 | |
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46 | =item is_start - The reading is the starting point for the collation. |
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47 | |
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48 | =item is_end - The reading is the ending point for the collation. |
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49 | |
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50 | =item is_lacuna - The 'reading' represents a known gap in the text. |
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51 | |
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52 | =item is_ph - A temporary placeholder for apparatus parsing purposes. Do |
53 | not use unless you know what you are doing. |
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54 | |
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55 | =item rank - The sequence number of the reading. This should probably not |
56 | be set manually. |
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57 | |
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58 | =back |
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59 | |
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60 | One of 'text', 'is_start', 'is_end', or 'is_lacuna' is required. |
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61 | |
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62 | =head2 collation |
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63 | |
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64 | =head2 id |
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65 | |
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66 | =head2 text |
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67 | |
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68 | =head2 is_start |
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69 | |
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70 | =head2 is_end |
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71 | |
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72 | =head2 is_lacuna |
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73 | |
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74 | =head2 rank |
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75 | |
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76 | Accessor methods for the given attributes. |
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77 | |
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78 | =cut |
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79 | |
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80 | has 'collation' => ( |
81 | is => 'ro', |
82 | isa => 'Text::Tradition::Collation', |
83 | # required => 1, |
84 | weak_ref => 1, |
85 | ); |
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86 | |
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87 | has 'id' => ( |
88 | is => 'ro', |
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89 | isa => 'ReadingID', |
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90 | required => 1, |
91 | ); |
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92 | |
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93 | has 'text' => ( |
94 | is => 'ro', |
95 | isa => 'Str', |
96 | required => 1, |
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97 | writer => 'alter_text', |
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98 | ); |
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99 | |
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100 | has 'is_lemma' => ( |
101 | is => 'ro', |
102 | isa => 'Bool', |
103 | default => undef, |
104 | writer => 'make_lemma', |
105 | ); |
106 | |
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107 | has 'is_start' => ( |
108 | is => 'ro', |
109 | isa => 'Bool', |
110 | default => undef, |
111 | ); |
112 | |
113 | has 'is_end' => ( |
114 | is => 'ro', |
115 | isa => 'Bool', |
116 | default => undef, |
117 | ); |
118 | |
119 | has 'is_lacuna' => ( |
120 | is => 'ro', |
121 | isa => 'Bool', |
122 | default => undef, |
123 | ); |
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124 | |
125 | has 'is_ph' => ( |
126 | is => 'ro', |
127 | isa => 'Bool', |
128 | default => undef, |
129 | ); |
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130 | |
131 | has 'is_common' => ( |
132 | is => 'rw', |
133 | isa => 'Bool', |
134 | default => undef, |
135 | ); |
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136 | |
137 | has 'rank' => ( |
138 | is => 'rw', |
139 | isa => 'Int', |
140 | predicate => 'has_rank', |
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141 | clearer => 'clear_rank', |
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142 | ); |
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143 | |
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144 | ## For prefix/suffix readings |
145 | |
146 | has 'join_prior' => ( |
147 | is => 'ro', |
148 | isa => 'Bool', |
149 | default => undef, |
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150 | writer => '_set_join_prior', |
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151 | ); |
152 | |
153 | has 'join_next' => ( |
154 | is => 'ro', |
155 | isa => 'Bool', |
156 | default => undef, |
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157 | writer => '_set_join_next', |
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158 | ); |
159 | |
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160 | |
161 | around BUILDARGS => sub { |
162 | my $orig = shift; |
163 | my $class = shift; |
164 | my $args; |
165 | if( @_ == 1 ) { |
166 | $args = shift; |
167 | } else { |
168 | $args = { @_ }; |
169 | } |
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170 | |
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171 | # If one of our special booleans is set, we change the text and the |
172 | # ID to match. |
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173 | if( exists $args->{'is_lacuna'} && $args->{'is_lacuna'} && !exists $args->{'text'} ) { |
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174 | $args->{'text'} = '#LACUNA#'; |
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175 | } elsif( exists $args->{'is_start'} && $args->{'is_start'} ) { |
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176 | $args->{'id'} = '__START__'; # Change the ID to ensure we have only one |
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177 | $args->{'text'} = '#START#'; |
178 | $args->{'rank'} = 0; |
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179 | } elsif( exists $args->{'is_end'} && $args->{'is_end'} ) { |
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180 | $args->{'id'} = '__END__'; # Change the ID to ensure we have only one |
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181 | $args->{'text'} = '#END#'; |
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182 | } elsif( exists $args->{'is_ph'} && $args->{'is_ph'} ) { |
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183 | $args->{'text'} = $args->{'id'}; |
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184 | } |
185 | |
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186 | # Backwards compatibility for non-XMLname IDs |
187 | my $rid = $args->{'id'}; |
188 | $rid =~ s/\#/__/g; |
189 | $rid =~ s/[\/,]/./g; |
190 | if( $rid !~ /^$xml10_namestartchar_rx/ ) { |
191 | $rid = 'r'.$rid; |
192 | } |
193 | $args->{'id'} = $rid; |
194 | |
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195 | $class->$orig( $args ); |
196 | }; |
197 | |
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198 | # Look for a lexeme-string argument in the build args; if there, pull in the |
199 | # morphology role if possible. |
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200 | sub BUILD { |
201 | my( $self, $args ) = @_; |
202 | if( exists $args->{'lexemes'} ) { |
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203 | unless( $self->can( '_deserialize_lexemes' ) ) { |
204 | warn "No morphology package installed; DROPPING lexemes"; |
205 | return; |
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206 | } |
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207 | $self->_deserialize_lexemes( $args->{'lexemes'} ); |
208 | } |
209 | } |
210 | |
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211 | =head2 is_meta |
212 | |
213 | A meta attribute (ha ha), which should be true if any of our 'special' |
214 | booleans are true. Implies that the reading does not represent a bit |
215 | of text found in a witness. |
216 | |
217 | =cut |
218 | |
219 | sub is_meta { |
220 | my $self = shift; |
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221 | return $self->is_start || $self->is_end || $self->is_lacuna || $self->is_ph; |
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222 | } |
223 | |
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224 | =head2 is_identical( $other_reading ) |
225 | |
226 | Returns true if the reading is identical to the other reading. The basic test |
227 | is equality of ->text attributes, but this may be wrapped or overridden by |
228 | extensions. |
229 | |
230 | =cut |
231 | |
232 | sub is_identical { |
233 | my( $self, $other ) = @_; |
234 | return $self->text eq $other->text; |
235 | } |
236 | |
237 | =head2 is_combinable |
238 | |
239 | Returns true if the reading may in theory be combined into a multi-reading |
240 | segment within the collation graph. The reading must not be a meta reading, |
241 | and it must not have any relationships in its own right with any others. |
242 | This test may be wrapped or overridden by extensions. |
243 | |
244 | =cut |
245 | |
246 | sub is_combinable { |
247 | my $self = shift; |
248 | return undef if $self->is_meta; |
249 | return !$self->related_readings(); |
250 | } |
251 | |
252 | # Not really meant for public consumption. Adopt the text of the other reading |
253 | # into this reading. |
254 | sub _combine { |
255 | my( $self, $other, $joinstr ) = @_; |
256 | $self->alter_text( join( $joinstr, $self->text, $other->text ) ); |
257 | # Change this reading to a joining one if necessary |
258 | $self->_set_join_next( $other->join_next ); |
259 | } |
260 | |
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261 | =head1 Convenience methods |
262 | |
263 | =head2 related_readings |
264 | |
265 | Calls Collation's related_readings with $self as the first argument. |
266 | |
267 | =cut |
268 | |
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269 | sub related_readings { |
270 | my $self = shift; |
271 | return $self->collation->related_readings( $self, @_ ); |
272 | } |
273 | |
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274 | =head2 witnesses |
275 | |
276 | Calls Collation's reading_witnesses with $self as the first argument. |
277 | |
278 | =cut |
279 | |
280 | sub witnesses { |
281 | my $self = shift; |
282 | return $self->collation->reading_witnesses( $self, @_ ); |
283 | } |
284 | |
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285 | =head2 predecessors |
286 | |
287 | Returns a list of Reading objects that immediately precede $self in the collation. |
288 | |
289 | =cut |
290 | |
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291 | sub predecessors { |
292 | my $self = shift; |
293 | my @pred = $self->collation->sequence->predecessors( $self->id ); |
294 | return map { $self->collation->reading( $_ ) } @pred; |
295 | } |
296 | |
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297 | =head2 successors |
298 | |
299 | Returns a list of Reading objects that immediately follow $self in the collation. |
300 | |
301 | =cut |
302 | |
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303 | sub successors { |
304 | my $self = shift; |
305 | my @succ = $self->collation->sequence->successors( $self->id ); |
306 | return map { $self->collation->reading( $_ ) } @succ; |
307 | } |
308 | |
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309 | ## Utility methods |
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310 | |
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311 | sub _stringify { |
312 | my $self = shift; |
313 | return $self->id; |
314 | } |
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315 | |
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316 | sub TO_JSON { |
317 | my $self = shift; |
318 | return $self->text; |
319 | } |
320 | |
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321 | sub throw { |
322 | Text::Tradition::Error->throw( |
323 | 'ident' => 'Reading error', |
324 | 'message' => $_[0], |
325 | ); |
326 | } |
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327 | |
328 | no Moose; |
329 | __PACKAGE__->meta->make_immutable; |
330 | |
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331 | 1; |