MeCab の Ruby バインディングに薄い皮をかぶせたもの。Ruby らしく each でループしたいがためだけに作りました。

mecab-tagger.rb

# -*- coding: utf-8 -*-

require 'MeCab'

class MeCabTagger
  class MeCabNode
    def initialize(node, charset)
      @node = node
      @feature = node.feature.force_encoding(charset).split(',')
      @charset = charset
    end

    def pos
      return @feature[0]
    end

    def pos_detail1
      return @feature[1]
    end

    def pos_detail2
      return @feature[2]
    end

    def pos_detail3
      return @feature[3]
    end

    def basic_string
      return @feature[6]
    end

    def surface
      return @node.surface.force_encoding(@charset)
    end

    def word
      if @feature[6] == "*"
        return surface()
      else
        return @feature[6]
      end
    end
  end

  class MeCabResult
    def initialize(head, charset)
      @head = head
      @charset = charset
    end

    def each
      node = @head.next
      while node.next != nil
        yield MeCabNode.new(node, @charset)
        node = node.next
      end
    end
  end

  def initialize(charset)
    @tagger = MeCab::Tagger.new
    @charset = charset
  end

  def parse(text)
    return [] if text == nil || text.length == 0
    return MeCabResult.new(@tagger.parseToNode(text), @charset)
  end
end

if __FILE__ == $0
  tagger = MeCabTagger.new('UTF-8')
  tagger.parse('吾輩は猫である。名前はまだない。').each do |node|
    puts "pos : #{node.pos}, word : #{node.word}"
  end
end