Module: ITOEN

Defined in:
lib/itoen/errors.rb,
lib/itoen/version.rb,
lib/itoen/converter.rb

Defined Under Namespace

Classes: TooBigError

Constant Summary collapse

VERSION = 
"0.0.1"
TABLE_0_9 = 
%w(zero one two three four five six seven eight nine)
TABLE_11_19 = 
%w(eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen)
TABLE_PER_10 = 
%w(_ ten twenty thirty forty fifty sixty seventy eighty ninety)
TABLE_POW_1000 = 
%w(_ thousand million billion trillion quadrillion quintillion sextillion 
septillion octillion nonillion decillion undecillion duodecillion tredecillion quattuordecillion
quindecillion sexdecillion septendecillion octodecillion novemdecillion vigintillion unvigintillion
duovigintillion trevigintillion quattuorvigintillion quinvigintillion sexvigintillion septenvigintillion
octovigintillion novemvigintillion trigintillion untrigintillion duotrigintillion tretrigintillion quattuortrigintillion
quintrigintillion sextrigintillion septentrigintillion octotrigintillion novemtrigintillion quadragintillion
unquadragintillion duoquadragintillion trequadragintillion quattuorquadragintillion quinquadragintillion sexquadragintillion
septenquadragintillion octoquadragintillion novemquadragintillion quinquagintillion unquinquagintillion duoquinquagintillion
trequinquagintillion quattuorquinquagintillion quinquinquagintillion sexquinquagintillion septenquinquagintillion octoquinquagintillion
novemquinquagintillion sexagintillion unsexagintillion duosexagintillion tresexagintillion quattuorsexagintillion quinsexagintillion
sexsexagintillion septsexagintillion octosexagintillion novemsexagintillion septuagintillion unseptuagintillion duoseptuagintillion
treseptuagintillion quattuorseptuagintillion quinseptuagintillion sexseptuagintillion septseptuagintillion octoseptuagintillion
novemseptuagintillion octogintillion unoctogintillion duooctogintillion treoctogintillion quattuoroctogintillion quinoctogintillion
sexoctogintillion septoctogintillion octooctogintillion novemoctogintillion nonagintillion unnonagintillion duononagintillion
trenonagintillion quattuornonagintillion quinnonagintillion sexnonagintillion septnonagintillion octononagintillion novemnonagintillion centillion)

Class Method Summary collapse

Class Method Details

.itoen(num) ⇒ Object 



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# File 'lib/itoen/converter.rb', line 23

def itoen(num)
  if num < 0
    return "negative #{itoen(-num)}"
  end

  int, decimal = num.to_s.split('.').map{|_| _.each_char.map(&:to_i) }
  int = int.reverse

  ret = []
  ret.concat(case num
  when 0..9
    [TABLE_0_9[num]]
  when 11..19
    [TABLE_11_19[num - 11]]
  when ->(n){ n < 100 }
    [
      [
        (int[1] != 0 ? TABLE_PER_10[int[1]] : ''),
        (int[0] != 0 ? '-' : ''),
        (int[0] != 0 ? TABLE_0_9[int[0]] : '')
        ].join
      ]
  when ->(n){ n < 1000 }
    under100 = int[0..1].reverse.join.to_i
    [
      (int[2] != 0 ? "#{TABLE_0_9[int[2]]} hundred" : ''), 
      (under100 != 0 ? itoen(under100) : '')
    ]
  else
    int.each_slice(3).map.with_index do |nums, digit|
      num = nums.reverse.join.to_i
      next nil if num == 0
      begin
        "#{itoen(num)} #{digit != 0 ? TABLE_POW_1000.fetch(digit) : ''}"
      rescue IndexError
        raise TooBigError
      end
    end.reverse.select{|n| n}
  end)

  if decimal
    ret << 'point'
    ret.concat decimal.map{|d| itoen(d) }
  end

  ret.join(' ').strip
end