Class: Numerical::Encoder

Inherits:
Object
  • Object
show all
Defined in:
lib/numerical/encoder.rb

Constant Summary collapse

NUMBERS = 
Numerical::Constants::NUMBERS.invert.freeze
SHORT_FORM = 
Numerical::Constants::SHORT_FORM.invert.freeze

Instance Method Summary collapse

Instance Method Details

#encode(value) ⇒ Object 



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# File 'lib/numerical/encoder.rb', line 7

def encode(value)
  case value
  when 0 .. 20
    result = NUMBERS[value]
  when 21 .. 99
    result = NUMBERS[(value / 10) * 10]
    result += '-' + NUMBERS[value % 10] if value % 10 != 0
  when 100 .. 999
    result = NUMBERS[value / 100] + ' hundred'
    result += ' and ' + encode(value % 100) if value % 100 != 0
  else
    magnitude = 1000 ** Math.log(value, 1000).floor
    result = encode(value / magnitude) + ' ' + SHORT_FORM[magnitude]
    result += ', ' + encode(value % magnitude) if value % magnitude != 0
  end

  result
end