Module: Deordinalize

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

Constant Summary collapse

EXPLICITS = 
{
  'first'         => 1,
  'second'        => 2,
  'third'         => 3,
  'ninth'         => 9,
  'eleventh'      => 11,
  'twelfth'       => 12,
  'twentieth'     => 20,
  'thirtieth'     => 30,
  'fortieth'      => 40,
  'fiftieth'      => 50,
  'sixtieth'      => 60,
  'seventieth'    => 70,
  'eightieth'     => 80,
  'ninetieth'     => 90,
  'one hundredth' => 100
}
REGULARS = 
{
  'thir'  => 3,
  'four'  => 4,
  'fif'   => 5,
  'six'   => 6,
  'seven' => 7,
  'eigh'  => 8,
  'nine'  => 9,
  'ten'   => 10
}
TENS = 
{
  'twenty'  => 20,
  'thirty'  => 30,
  'forty'   => 40,
  'fifty'   => 50,
  'sixty'   => 60,
  'seventy' => 70,
  'eighty'  => 80,
  'ninety'  => 90
}
TENS_MATCH = 
/(#{TENS.keys.join '|'})-/
ORDINAL = 
/^(\d+)(?:st|nd|rd|th)$/
VERSION = 
"0.0.3"

Instance Method Summary collapse

Instance Method Details

#deordinalize ⇒ Object 



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# File 'lib/deordinalize.rb', line 47

def deordinalize
  
  sum = 0
  
  # if we have a tens prefix, assign it to the sum and remove it from our self
  if tens = self[TENS_MATCH, 1]
    sum = TENS[tens]
    self.sub! "#{tens}-", ''
  end
  
  # TODO try refactoring this block out into its own method
  
  # if we have a numeric ordinal, pretty much just need to strip out the number
  if ordinal = self[ORDINAL, 1]
    ordinal.to_i
    
  # if we have an explicit ordinal, find it in the map
  elsif explicit = EXPLICITS[self]
    sum + explicit
    
  # if we have a teen, find the regular prefix and add ten
  elsif regular = self[/^(.+)teenth$/, 1]
    10 + REGULARS[regular]
  
  # if we have a regular prefix, add it to the sum
  elsif regular = self[/^(.+)th$/, 1]
    sum + REGULARS[ regular ]
  end
  
end

#deordinalize! ⇒ Object 



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# File 'lib/deordinalize.rb', line 78

def deordinalize!
  self.deordinalize - 1
end