RubyでYahoo日本語形態解析APIを使って文章中から名詞を取り出すサンプル

yahoojaparse.rb

require 'net/http'
require 'uri'
require 'rexml/document'

id = 'your appid'
text = '庭には二羽ニワトリがいる'
response = Net::HTTP.post_form(URI.parse('http://jlp.yahooapis.jp/MAService/V1/parse'),
  								{'appid'=> id,
		   						 'sentence' => text,
								 'results' => 'ma'})

xml =  REXML::Document.new(response.body)
word_array = []
xml.elements.each('ResultSet/ma_result/word_list/word') do |element|
  if element.elements['pos'].text == "名詞"
    word_array << element.elements['surface'].text
  end	
end
word_array.each{|word| puts word}