Module: GoogCurrency

Defined in:
lib/goog_currency.rb,
lib/goog_currency/version.rb

Defined Under Namespace

Classes: Exception, NoMethodException

Constant Summary collapse

MILLION = 
1_000_000
VERSION = 
"1.0.2"

Class Method Summary collapse

Class Method Details

.method_missing(meth, *args) ⇒ Object 



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# File 'lib/goog_currency.rb', line 7

def self.method_missing(meth, *args)
  from, to = meth.to_s.split("_to_")

  if from.nil? or to.nil? or from == "" or to == ""
    raise NoMethodException, "GoogCurrency accepts methods in 'usd_to_inr' or 'gbp_to_usd' format"
  end

  response = RestClient.get("http://www.google.com/ig/calculator?hl=en&q=#{args.first}#{from.upcase}=?#{to.upcase}").body

  # response is not valid json
  # Remove unicode character used as thousands separator by the Google API
  encoding_options = {
    :invalid           => :replace,  # Replace invalid byte sequences
    :undef             => :replace,  # Replace anything not defined in ASCII
    :replace           => ''        # Use a blank for those replacements
    #:universal_newline => true       # Always break lines with \n
  }
  response = response.encode(Encoding.find('ASCII'), encoding_options)
  response.gsub!(/(lhs|rhs|error|icc)/, '"\1"')
  response_hash = JSON.parse(response)

  if response_hash['error'].nil? or response_hash['error'] == ''
    case response_hash['rhs']
    when /million/
      response_hash['rhs'].to_f * MILLION
    when /billion/
      response_hash['rhs'].to_f * MILLION * 1_000
    when /trillion/
      response_hash['rhs'].to_f * MILLION * MILLION
    else
      response_hash['rhs'].to_f
    end
  else
    raise Exception, "An error occurred: #{response_hash['error']}"
  end
end

.respond_to?(meth) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/goog_currency.rb', line 44

def self.respond_to?(meth)
  from, to = meth.to_s.split("_to_")

  if from.nil? or from == "" or to.nil? or to == ""
    super
  else
    true
  end
end