Class: NationalRail::JourneyPlanner

Inherits:
Object
  • Object
show all
Defined in:
lib/national-rail/journey_planner.rb,
lib/national-rail/journey_planner/details_page_parser.rb

Defined Under Namespace

Classes: DetailsPageParser, NokogiriParser, SummaryRow, TimeParser

Constant Summary collapse

OPERATORS = 
{
  "Arriva Trains Wales" => "AW",
  "c2c" => "CC",
  "Chiltern Railways" => "CH",
  "CrossCountry" => "XC",
  "East Coast" => "GR",
  "East Midlands Trains" => "EM",
  "First Capital Connect" => "FC",
  "First Great Western" => "GW",
  "First ScotRail" => "SR",
  "Gatwick Express" => "GX",
  "Grand Central Railway" => "GC",
  "Heathrow Connect" => "HC",
  "Heathrow Express" => "HX",
  "Hull Trains" => "HT",
  "Island Line" => "IL",
  "London Midland" => "LM",
  "London Overground" => "LO",
  "London Underground" => "LT",
  "Merseyrail" => "ME",
  "Northern Rail" => "NT",
  "NXEA" => "LE",
  "South West Trains" => "SW",
  "Southeastern" => "SE",
  "Southern" => "SN",
  "Transpennine Express" => "TP",
  "Virgin Trains" => "VT",
  "Wrexham and Shropshire Railway" => "WS"
}

Class Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ JourneyPlanner

Returns a new instance of JourneyPlanner.



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# File 'lib/national-rail/journey_planner.rb', line 129

def initialize
  Time.zone ||= 'London'
  @agent = Mechanize.new
  @agent.pluggable_parser.html = NokogiriParser
  aliases = Mechanize::AGENT_ALIASES.keys - %w(Mechanize)
  @agent.user_agent_alias = aliases[rand(aliases.length)]
end

Class Attribute Details

.capture_path ⇒ Object

Returns the value of attribute capture_path.



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# File 'lib/national-rail/journey_planner.rb', line 57

def capture_path
  @capture_path
end

Class Method Details

.capture(page, filename) ⇒ Object 



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# File 'lib/national-rail/journey_planner.rb', line 58

def capture(page, filename)
  if capture_path.present?
    FileUtils.mkdir_p(capture_path)
    path = File.join(capture_path, filename)
    File.open(path, "w") { |f| f.write(TidyFFI::Tidy.new(page.parser.to_html).clean) }
  end
rescue => e
  puts e
end

Instance Method Details

#plan(options = {}) ⇒ Object 



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# File 'lib/national-rail/journey_planner.rb', line 137

def plan(options = {})
  summary_rows = []
  @agent.get("http://www.nationalrail.co.uk/") do |home_page|
    JourneyPlanner.capture(home_page, "index.html")
    button = nil
    times_page = home_page.form_with(:action => "http://ojp.nationalrail.co.uk/en/s/planjourney/plan") do |form|
      button = form.buttons.last
      form["jpState"] = "single"
      form["commandName"] = "journeyPlannerCommand"
      form["from.searchTerm"] = options[:from]
      form["to.searchTerm"] = options[:to]
      form["timeOfOutwardJourney.arrivalOrDeparture"] = "DEPART"
      form["timeOfOutwardJourney.monthDay"] = options[:time].strftime("%d/%m/%Y")
      form["timeOfOutwardJourney.hour"] = options[:time].strftime("%H")
      form["timeOfOutwardJourney.minute"] = options[:time].strftime("%M")
      # form["timeOfReturnJourney.arrivalOrDeparture"] = "DEPART"
      # form["timeOfReturnJourney.monthDay"] = "Today"
      # form["timeOfReturnJourney.hour"] = "15"
      # form["timeOfReturnJourney.minute"] = "0"
      form["viaMode"] = "VIA"
      form["via.searchTerm"] = ""
      form["offSetOption"] = "0"
      form["reduceTransfers"] = "true"
      form["_reduceTransfers"] = "on" # hidden (duplicate of reduceTransfers?)
      form["operatorMode"] = "SHOW" # alternative is "DONT_SHOW"
      form["operator.code"] = ""
      form["lookForSleeper"] = "true"
      form["_lookForSleeper"] = "on" # hidden (duplicate of lookForSleeper?)
      form["directTrains"] = "true"
      form["_directTrains"] = "on" # hidden (duplicate of directTrains?)
      form["includeOvertakenTrains"] = "true"
      form["_includeOvertakenTrains"] = "on" # hidden (duplicate of includeOvertakenTrains?)
    end.click_button(button)

    JourneyPlanner.capture(times_page, "summary.html")

    if (times_page.doc/".error-message").any?
      raise InputError.new((times_page.doc/".error-message").first.inner_text.gsub(/\s+/, " ").strip)
    end

    year = options[:time].year
    date_as_string = (times_page.doc/".journey-details span").first.children.first.inner_text.gsub(/\s+/, " ").gsub(/\+ 1 day/, '').strip
    date = Date.parse("#{date_as_string} #{year}")

    (times_page.doc/"table#outboundJourneyTable > tbody > tr").reject { |tr| %w(status changes).include?(tr.attributes["class"].value) }.each do |tr|

      if (tr.attributes["class"].value == "day-heading")
        date_as_string = (tr/"th > p > span").first.inner_text.strip
        date = Date.parse("#{date_as_string} #{year}")
        next
      end

      departure_time = TimeParser.new(date).time((tr/"td:nth-child(1)").inner_text.strip)
      number_of_changes = (tr/"td:nth-child(6)").inner_text.strip
      status = (tr/"td:nth-child(10) .status").inner_text.strip

      anchor = (tr/"a[@id^=journeyOption]").first
      next unless anchor

      link = times_page.links.detect { |l| l.attributes["id"] == anchor.attributes["id"].value }

      summary_rows << SummaryRow.new(@agent, date, departure_time, number_of_changes, link, status)
    end
  end
  summary_rows
rescue => e
  page = @agent.current_page
  JourneyPlanner.capture(page, "summary-error.html")
  page_html = TidyFFI::Tidy.new(page.parser.to_html).clean
  raise ParseError.new(e, page_html)
end