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require "net/http" require "open-uri" require "hpricot" # makes 1284.eur.to.usd types of queries possible class CurrencyConverter Currencies = { :huf => "HUF", :eur => "EUR", :usd => "USD", :gbp => "GBP", :chf => "CHF" } # these methods "close" the quote. # when they are called, it means all data is ready # the quote can be sent. class_eval do Currencies.each_key do |curr| define_method curr do @to = curr calculate end end end def initialize(amount, from=nil, to=nil) @amount = amount #FIXME: !Currencies.include?(from) => "No such currency" @from = from @to = to end def send_request_for_quote from_as_param = @from.to_s.upcase to_as_param = @to.to_s.upcase url = "http://xurrency.com/#{[@amount, @from, @to].join('/')}/feed" doc = Hpricot(open(url).read) (doc/'dc:value').inner_html end def calculate response = send_request_for_quote response # rate = get_conversion_rate(response) # @amount * rate # "#{@amount} #{@from} #{@to}" end def to self end end class Fixnum def method_missing(name) CurrencyConverter.new(self, name) end end

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