tokyo_weather.rb

# -*- encoding: UTF-8 -*-

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



class Weather
  @@signs = {"くもり" => "☁" \
          , "雨" => "☂" \
          , "晴れ" => "☀" \
          , "雪" => "☃" \
  }
  def initialize(node)
    get_elem = Proc.new {|tag| node.elements[tag].text }
    @weather = get_elem.call('weather')
    @temperature_max = get_elem.call("temperature/range[@centigrade='max']")
    @temperature_min = get_elem.call("temperature/range[@centigrade='min']")
    @chance_of_rain_nodes_par_hours = node.elements.each("rainfallchance/period") do |el|
      el
    end
  end

  def weather_as_sign()
    sygned = @weather.split(/[一時\|のち\|時々]/).select{|s| s != ""}.map {|s| @@signs[s]}
    return sygned.join()
  end

  def near_chance_of_rain()
    now_hour = Time.now.hour.to_i
    nearest_chance = @chance_of_rain_nodes_par_hours.find do |el_node|
                        targ_times = el_node.attributes['hour'].split('-').map {|s| s.to_i}
                        now_hour.between?(targ_times[0], targ_times[1])
                      end
    return nearest_chance.text + "%"
  end

  attr_accessor :weather, :temperature_max, :temperature_min, :chance_of_rain
end


CITY_MAP = {:tokyo => '13'}

def get_weather_xml(city)
  uri = URI("http://www.drk7.jp/weather/xml/#{CITY_MAP[city]}.xml")
  Net::HTTP.get(uri)
end


def parse_tokyo_info(weather_info)
  doc = REXML::Document.new(weather_info)
  areas = doc.elements["weatherforecast/pref/area[@id='東京地方']"]
  gen = Enumerator.new do |__yield|
          areas.elements.each('info') do |element|
            __yield << Weather.new(element)
          end
        end
  return gen
end


if __FILE__ == $0
  info = parse_tokyo_info(get_weather_xml(:tokyo))
  # 日付順なので一番上が当日の日付になる
  today_info = info.first
  puts "weather: #{today_info.weather_as_sign()} - #{today_info.near_chance_of_rain()}"
  puts "temperature: #{today_info.temperature_min} - #{today_info.temperature_max}"
end