Class: Kampyo::Cabocha

Inherits:
Text
  • Object
show all
Defined in:
lib/kampyo/cabocha.rb

Overview

Text

Instance Method Summary collapse

Methods inherited from Text

#ext_reading, #initialize

Constructor Details

This class inherits a constructor from Kampyo::Text

Instance Method Details

#analysis(cabocha) ⇒ Object

rubocop:enable Metrics/MethodLength



69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
 
# File 'lib/kampyo/cabocha.rb', line 69

def analysis(cabocha) # rubocop:todo Metrics/CyclomaticComplexity, Metrics/AbcSize, Metrics/MethodLength, Metrics/PerceivedComplexity
  chunks = cabocha[:chunks]
  tokens = cabocha[:tokens]

  subject_token = nil
  predicate_token = nil
  tod = '*'

  # 述語の候補
  predicate_chunk = chunks.find { |item| item[:link] == -1 }
  predicate_tokens = tokens.select { |item| item[:chunk] == predicate_chunk[:id] }

  # 主語の候補
  subject_chunk = chunks.find do |item|
    item[:link] == predicate_chunk[:id]
  end
  unless subject_chunk.nil?
    subject_tokens = tokens.select do |item|
      item[:chunk] == subject_chunk[:id] &&
        item[:feature1] == '名詞' &&
        %w[一般 固有名詞 サ変接続 接尾 数 副詞可能].include?(item[:feature2])
    end

    subject_tokens.each do |token|
      next_token = tokens.find do |item|
        item[:id] == token[:id] + 1 &&
          item[:chunk] == token[:chunk] &&
          %w[は って も が].include?(item[:baseform])
      end

      next if next_token.nil?

      # 主語として確定する
      subject_token = token
      next
    end
  end

  predicate_tokens.each do |token| # rubocop:todo Metrics/BlockLength
    if %w[形容詞 動詞 名詞].include?(token[:feature1]) &&
       %w[一般 自立 サ変接続 接尾].include?(token[:feature2]) &&
       token[:baseform] != '*'
      # 述語として確定する

      predicate_token = token
    end

    next unless %w[動詞 終助詞 助動詞 助詞].include?(token[:feature1])

    # 文体系を確定する
    tods = {
      'れる' => '受身・尊敬・可能・自発',
      'られる' => '受身・尊敬・可能・自発',
      'せる' => '使役',
      'させる' => '使役',
      'ない' => '打消',
      'ぬ' => '打消',
      'ん' => '打消',
      'う' => '推量・意志・勧誘',
      'よう' => '推量・意志・勧誘',
      'まい' => '打消推量・打消意志',
      'たい' => '希望',
      'たがる' => '希望',
      'た' => '過去・完了・存在・確認',
      'ます' => '丁寧',
      'そうだ' => '様態・伝聞',
      'らしい' => '推定',
      'ようだ' => '比況・例示・推定',
      'だ' => '断定',
      'です' => '断定',
      'な' => '禁止・感動',
      'か' => '疑問・反語・感動',
      'の' => '断定・質問',
      'よ' => '強意・呼びかけ',
      'ぞ' => '強意',
      'も' => '確信',
      'ね' => '感動・念押し',
      'わ' => '感動・強意',
      'さ' => '断定'
    }

    tod = tods[token[:baseform]]
  end

  last_token = predicate_tokens.last

  if predicate_token.nil? && ['助動詞'].include?(last_token[:feature1])
    # 述語が確定していないとき最後の助動詞を述語として確定する
    predicate_token = last_token
  end

  if ['?', '？'].include?(last_token[:surface])
    # 述語の最後の形態素が?のとき
    tod = '疑問・反語・感動'
  end

  {
    subject: subject_token,
    predicate: predicate_token,
    tod: tod
  }
end

#parser(input) ⇒ Object

rubocop:todo Metrics/MethodLength



13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
 
# File 'lib/kampyo/cabocha.rb', line 13

def parser(input) # rubocop:todo Metrics/AbcSize, Metrics/MethodLength
  # <sentence>
  #  <chunk id="0" link="1" rel="D" score="0.000000" head="0" func="1">
  #   <tok id="0" feature="名詞,副詞可能,*,*,*,*,今日,キョウ,キョー" ne="B-DATE">今日</tok>
  #   <tok id="1" feature="助詞,係助詞,*,*,*,*,は,ハ,ワ" ne="O">は</tok>
  #  </chunk>
  #  <chunk id="1" link="-1" rel="D" score="0.000000" head="2" func="3">
  #   <tok id="2" feature="名詞,一般,*,*,*,*,雨,アメ,アメ" ne="O">雨</tok>
  #   <tok id="3" feature="助動詞,*,*,*,特殊・デス,基本形,です,デス,デス" ne="O">です</tok>
  #  </chunk>
  # </sentence>

  parser = CaboCha::Parser.new
  tree = parser.parse(input)

  chunks = []
  tokens = []
  token_position = 0
  (0..tree.chunk_size - 1).each do |i| # rubocop:todo Metrics/BlockLength
    chunk = tree.chunk(i)
    token_size = chunk.token_size

    chunks << {
      id: chunks.size + 1,
      link: chunk.link >= 0 ? chunk.link + 1 : -1,
      score: chunk.score
    }

    (token_position..token_position + token_size - 1).each do |j|
      token = tree.token(j)

      surface = token.surface.to_utf8
      feature0 = token.feature_list(0).to_utf8
      feature1 = token.feature_list(1).to_utf8
      feature6 = token.feature_list(6).to_utf8
      feature7 = token.feature_list(7).to_utf8

      tokens << {
        id: tokens.size + 1,
        chunk: i + 1,
        surface: surface,
        feature1: feature0,
        feature2: feature1,
        baseform: feature6,
        reading: feature7,
        ext_reading: ext_reading(feature7)
      }
    end

    token_position += token_size
  end

  { chunks: chunks, tokens: tokens }
end