Class: NumberNameString::Convert

Inherits:
Object
  • Object
show all
Defined in:
lib/number_name_string/convert.rb

Constant Summary collapse

ONES =

TODO: convert to arrays for multiple spellings

- [forty, fourty]
- [hundred, hundered]

%W{ #{} one two three four five six seven eight nine }
ONES_ZERO = 
%W{ zero one two three four five six seven eight nine }
TEENS = 
%w{ ten eleven twelve thirteen fourteen fifteen sixteen
seventeen eighteen nineteen }
TENS = 
%W{ #{} #{} twenty thirty forty fifty sixty seventy eighty ninety }
SCALE = 
%W{ #{} thousand million billion trillion quadrillion quintillion
sextillion septillion octillion nonillion decillion undecillion duodecillion
tredecillion quattuordecillion quindecillion sexdecillion septendecillion
octodecillion novemdecillion vigintillion }
SCALE_MAX = 
(SCALE.length - 1) * 3

Instance Method Summary collapse

Instance Method Details

#[](arg) ⇒ Object Also known as: << 



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# File 'lib/number_name_string/convert.rb', line 19

def [](arg)
  if arg.is_a? Fixnum
    to_s arg
  elsif arg.is_a? String 
    to_i arg
  else
    raise NumberNameStringError.new("Invalid arg type: #{arg.class.name}")
  end
end

#to_i(arg) ⇒ Object 



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# File 'lib/number_name_string/convert.rb', line 31

def to_i(arg)
  num = 0
  words = arg.downcase.gsub('-', '').split(/\s+/)
  while word = words.shift
    accum = 0
    # (sub_hundred | ones(false) hundred [sub_hundred] )[scale]]
    if sub_hundred?(word)
      if ones?(word, false) && hundred?(words[0])
        accum += ones?(word) * 100
        words.shift
        word = words.shift
      else
        accum += sub_hundred?(word)
      end
      word = words.shift
      if scale? word      
        accum *= scale? word
      end
    end
#        puts "accum: #{accum}"
    num += accum
  end
  num
end

#to_s(num, include_zero = true) ⇒ Object 



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# File 'lib/number_name_string/convert.rb', line 56

def to_s(num, include_zero = true)
  case digits = num.to_s.length
  when 1
    include_zero ? ONES_ZERO[num] : ONES[num]
  when 2
    num < 20 ? TEENS[num - 10] : "#{TENS[num / 10]}#{ONES[num % 10]}"
  when 3
    "#{ONES[num / 100]} hundred#{space_pad(to_s(num % 100, false))}"
  when (4..SCALE_MAX)
    zeros = 10 ** (((digits - 1) / 3) * 3)
    "%s%s%s" % [to_s(num / zeros, false),
                space_pad(SCALE[(digits - 1) / 3]),
                space_pad(to_s(num % zeros, false))]
  else
    raise NumberNameStringError.new('Number out of range')
  end
end