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0ce8c0cf |
1 | package Text::Tradition::Language::Perseus; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use Module::Load; |
6 | use Text::Tradition::Language::Base qw/ lemmatize_treetagger lfs_morph_tags /; |
7 | use TryCatch; |
8 | |
9 | =head1 NAME |
10 | |
11 | Text::Tradition::Language::Perseus - base module for those languages that rely |
12 | on a Lingua::Morph::Perseus database. |
13 | |
14 | =head1 DESCRIPTION |
15 | |
16 | Implements morphology lookup for words in context. This module depends on the Lingua::Morph::Perseus module for access to PhiloLogic database data. |
17 | |
18 | =head1 SUBROUTINES |
19 | |
20 | =head2 lemmatize( $text ) |
21 | |
22 | Evaluates the string using Treetagger and Perseus, and returns the results. |
23 | |
24 | =cut |
25 | |
26 | # tested in child language modules |
27 | |
28 | sub perseus_lemmatize { |
29 | my $self = shift; |
30 | my $tradition = shift; |
31 | my %opts = ( |
32 | 'language' => $tradition->language, |
33 | 'callback' => sub { _perseus_lookup_tt( $self, @_ ) } |
34 | ); |
35 | return lemmatize_treetagger( $tradition, %opts ); |
36 | } |
37 | |
38 | =head2 reading_lookup( $rdg[, $rdg, ...] ) |
39 | |
40 | Looks up one or more readings using the Perseus package, and returns the |
41 | possible results. This skips the tree tagger / tokenizer, returning any |
42 | match for the word string(s) in the morphology DB. |
43 | |
44 | =cut |
45 | |
46 | sub perseus_reading_lookup { |
47 | my( $self, @words ) = @_; |
48 | return map { $self->_perseus_lookup_str( $_ ) } @words; |
49 | } |
50 | |
51 | =head2 morphology_tags |
52 | |
53 | Return a data structure describing the available parts of speech and their attributes. |
54 | |
55 | =cut |
56 | |
57 | sub morphology_tags { |
58 | return lfs_morph_tags(); |
59 | } |
60 | |
61 | sub _get_lang { |
62 | my $self = shift; |
63 | my @parts = split( /::/, $self ); |
64 | return $parts[-1]; |
65 | } |
66 | |
67 | sub _morph_connect { |
68 | my $self = shift; |
69 | unless( $self::dbhandle ) { |
70 | my $lang = $self->_get_lang(); |
71 | try { |
72 | load 'Lingua::Morph::Perseus'; |
73 | $self::dbhandle = Lingua::Morph::Perseus->connect( $lang ); |
74 | } catch { |
75 | warn "Cannot do $lang word lemmatization without Lingua::Morph::Perseus: @_"; |
76 | return; |
77 | } |
78 | } |
79 | } |
80 | |
81 | sub _perseus_lookup_tt { |
82 | my $self = shift; |
83 | my( $orig, $pos, $lemma ) = split( /\t/, $_[0] ); |
84 | $self->_morph_connect(); |
85 | return unless $self::dbhandle; |
86 | # Discard results that don't match the lemma, unless lemma is unknown |
87 | my $lookupopts = {}; |
88 | unless( $lemma eq '<unknown>' || $lemma =~ /^\W+$/ ) { |
89 | my %lems; |
90 | map { $lems{$_} = 1; $lems{lc($_)} = 1 } split( /\|/, $lemma ); |
91 | $lookupopts->{'lemma'} = [ keys %lems ]; |
92 | } |
93 | $lookupopts->{'ttpos'} = $pos if $pos; |
94 | |
95 | my $result = $self::dbhandle->lexicon_lookup( $orig, $lookupopts ); |
96 | # unless( !keys( %$lookupopts ) || $result->{'filtered'} ) { |
97 | # warn "Filter on $pos / $lemma returned no results; using all results"; |
98 | # } |
99 | my @ret = @{$result->{'objects'}}; |
100 | my %unique_wordforms; |
101 | foreach my $obj ( @ret ) { |
102 | my $wf = $self->_wordform_from_row( $obj ); |
103 | $unique_wordforms{$wf->to_string} = $wf; |
104 | } |
105 | return values( %unique_wordforms ); |
106 | } |
107 | |
108 | sub _perseus_lookup_str { |
109 | my( $self, $orig ) = @_; |
110 | $self->_morph_connect(); |
111 | return unless $self::dbhandle; |
112 | # Simple morph DB lookup, and return the results. |
113 | my $result = $self::dbhandle->lexicon_lookup( $orig ); |
114 | return map { $self->_wordform_from_row( $_ ) } @{$result->{'objects'}}; |
115 | } |
116 | |
117 | sub _wordform_from_row { |
118 | my( $self, $rowobj ) = @_; |
119 | my $lemma = $rowobj->lemma; |
120 | $lemma =~ s/^(\D+)\d*$/$1/; |
121 | my $wf = Text::Tradition::Collation::Reading::WordForm->new( |
122 | 'language' => $self->_get_lang(), |
123 | 'lemma' => $lemma, |
124 | 'morphology' => $rowobj->morphology, |
125 | ); |
126 | return $wf; |
127 | } |
128 | |
129 | 1; |