Class: Bahn::DepartureBoard

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/bahn.rb

Constant Summary collapse

TRANSPORT_TYPES = 
{
	:ice =>0x100,
	:ic_ec => 0x80,
	:ir => 0x40,
	:regional => 0x20,
	:urban => 0x10,
	:bus => 0x08,
	:boat => 0x04,
	:subway => 0x02,
	:tram => 0x01
}

Instance Method Summary collapse

Constructor Details

#initialize(station, opts) ⇒ DepartureBoard

Returns a new instance of DepartureBoard.



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# File 'lib/bahn.rb', line 128

def initialize(station, opts)
	@station = station
	
	transport_types = Array(opts[:include] || TRANSPORT_TYPES.keys) - Array(opts[:exclude])
	filter_num = transport_types.inject(0) {|sum, type| sum + (TRANSPORT_TYPES[type] || 0) }
	filter = sprintf("%09b", filter_num)
	@url_prefix = "http://reiseauskunft.bahn.de/bin/bhftafel.exe/en?input=#{station.id}&productsFilter=#{filter}&start=1&boardType=dep&dateBegin=12.12.10&dateEnd=10.12.11&time=00:00"
	@departure_pages = []
end

Instance Method Details

#each ⇒ Object 



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# File 'lib/bahn.rb', line 138

def each
	0.upto(23) do |hour|
		doc = departure_page(hour)
		# find all tr children of table.result which contain a td.train
		# and do not have class 'browse'
		departure_docs = doc / 'table.result tr[td.train]:not(.browse)'
		departure_docs.each do |departure_doc|
			service_link = departure_doc % 'td.train:nth(2) a'
			destination_link = departure_doc % 'td.route span.bold a'
			(destination_id, destination_time_string), = destination_link['onclick'].scan(/^sHC\(this, '', '(\d+)','([^']*)'\)/)
			destination_time = ClockTime.parse(destination_time_string)

			intermediate_stops =  (departure_doc % 'td.route').children.find_all{|node| node.text?}.join(' ')
			departure_time = ClockTime.parse((departure_doc % 'td.time').inner_text)
			last_time = departure_time
			days_passed = 0

			intermediate_stops.scan(/\d+:\d+/) do |time_string|
				time = ClockTime.parse(time_string)
				days_passed += 1 if time < last_time
				last_time = time
			end
			inferred_time_to_destination = days_passed * 24*60*60 + (destination_time - departure_time)
			
			platform_td = departure_doc % 'td.platform'
			if platform_td.nil?
				platform = :none
			else
				platform = platform_td.inner_text.strip
			end

			yield Stop.new(
				:station => @station,
				:service => Service.new(
					:path => service_link['href'].sub(/\?.*/, ''),
					:name => service_link.inner_text.strip.gsub(/\s+/, ' '),
					:destination_info => {
						:station => Station.new(
							:id => destination_id,
							:name => destination_link.inner_text.strip
						),
						:arrival_time => destination_time
					}
				),
				:departure_time => departure_time,
				:platform => (platform == '' ? :none : platform),
				:inferred_time_to_destination => inferred_time_to_destination
			)
		end
	end
end