雑な MeCab の Ruby バインディング

negitoro.rb

class Negitoro
  extend FFI::Library
  ffi_lib 'mecab'
 
  attach_function :mecab_new2, [:string], :pointer
  attach_function :mecab_sparse_tostr, [:pointer, :string], :string
  attach_function :mecab_destroy, [:pointer], :void
 
  def self.clean_proc(tagger)
    Proc.new { mecab_destroy tagger }
  end
 
  def initialize(option = "")
    @tagger = mecab_new2 option
    ObjectSpace.define_finalizer self, self.class.clean_proc(@tagger)
  end
 
  def parse(str)
    raise ArgumentError.new 'String to parse cannot be nil' if str.nil?
    mecab_sparse_tostr(@tagger, str)
      .force_encoding(Encoding.default_external)
  end
end