石川県の大気環境の状況を取得。作りかけ。 取得元 http://www.pref.ishikawa.jp/cgi-bin/taiki/top.pl / プロジェクト継続先 https://github.com/kitak/ishikawa_air_pollution

IshikawaAirPollutionAPI.rb

require 'rubygems'
require 'mechanize'

class IshikawaAirPollutionAPI

	def initialize()
		@use_sleep = false
		
		@agent = Mechanize.new
		@agent.user_agent_alias = 'Mac Safari'
		@agent.request_headers = {
			'Accept' => 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
			'Accept-language' => 'ja-jp',
			'Accept-charset' => '',
			'Accept-encoding' => 'gzip, deflate',
			'Keep-alive' => nil
		}
	end
	
	def pm25(args)
		measure = {}
		
		page = @agent.get('http://www.pref.ishikawa.jp/cgi-bin/taiki/top.pl')
		
		# 測定日時を取得
		measure_date = nil
		measure_time = nil
		page.search('#subhead div').each do |div|
			text = div.text
			measure_date = text if /(\d{4})年(\d{2})月(\d{2})日/ =~ text
			measure_time = text if /\d{2}:\d{2}/ =~ text
		end
		measure['date'] = measure_date
		measure['time'] = measure_time
		
		# データテーブルを探す
		points = []
		page.search('table').each do |table|
			next if table.search('td')[0].text != '測定局名'
			
			# テーブルヘッダをキーにする
			header = []
			targetKey = nil
			trs = table.search('tr')
			thead = trs.shift
			thead.search('td').each do |td|
				key = td.text
				targetKey = key if /PM2\.5/ =~ key
				header.push(key)
			end
			
			raise 'invalid form' if !targetKey
			
			# データをなめる
 			rows = []
 			trs.each do |tr|
 				row = {}
 				i = 0
 				tr.search('td').each do |td|
 					row[ header[i] ] = td.text.gsub(/\302\240/, ' ').strip
 					i += 1
				end
 				rows.push(row)
 				
	 			points.push({
	 				'name' => row['測定局名'],
	 				'value' => row[targetKey],
	 			}) if row[targetKey] != ''
 			end
		end
		measure['points'] = points
		
		measure
	end
	
end