Class: Mitie::Document

Inherits:
Object
  • Object
show all
Defined in:
lib/mitie/document.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model, text) ⇒ Document

Returns a new instance of Document.



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# File 'lib/mitie/document.rb', line 5

def initialize(model, text)
  @model = model
  @text = text
end

Instance Attribute Details

#model ⇒ Object (readonly)

Returns the value of attribute model.



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# File 'lib/mitie/document.rb', line 3

def model
  @model
end

#text ⇒ Object (readonly)

Returns the value of attribute text.



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# File 'lib/mitie/document.rb', line 3

def text
  @text
end

Instance Method Details

#entities ⇒ Object 



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# File 'lib/mitie/document.rb', line 34

def entities
  @entities ||= begin
    entities = []
    tokens = tokens_with_offset
    detections = FFI.mitie_extract_entities(pointer, tokens_ptr)
    num_detections = FFI.mitie_ner_get_num_detections(detections)
    num_detections.times do |i|
      pos = FFI.mitie_ner_get_detection_position(detections, i)
      len = FFI.mitie_ner_get_detection_length(detections, i)
      tag = FFI.mitie_ner_get_detection_tagstr(detections, i).to_s
      score = FFI.mitie_ner_get_detection_score(detections, i)
      tok = tokens[pos, len]
      offset = tok[0][1]

      entity = {}
      if offset
        finish = tok[-1][1] + tok[-1][0].bytesize
        entity[:text] = text.byteslice(offset...finish)
      else
        entity[:text] = tok.map(&:first)
      end
      entity[:tag] = tag
      entity[:score] = score
      entity[:offset] = offset if offset
      entity[:token_index] = pos
      entity[:token_length] = len
      entities << entity
    end
    entities
  ensure
    FFI.mitie_free(detections) if detections
  end
end

#tokens ⇒ Object 



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# File 'lib/mitie/document.rb', line 10

def tokens
  @tokens ||= tokens_with_offset.map(&:first)
end

#tokens_with_offset ⇒ Object 



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# File 'lib/mitie/document.rb', line 14

def tokens_with_offset
  @tokens_with_offset ||= begin
    if text.is_a?(Array)
      # offsets are unknown when given tokens
      text.map { |v| [v, nil] }
    else
      i = 0
      tokens = []
      loop do
        token = (tokens_ptr + i * Fiddle::SIZEOF_VOIDP).ptr
        break if token.null?
        offset = (offsets_ptr.ptr + i * Fiddle::SIZEOF_LONG).to_s(Fiddle::SIZEOF_LONG).unpack1("L!")
        tokens << [token.to_s.force_encoding(text.encoding), offset]
        i += 1
      end
      tokens
    end
  end
end