class Hundredth

Writes out ordinals to 100

Public Class Methods

default_locale() click to toggle source

# File lib/hundredth.rb, line 28
def default_locale
  I18n.config.default_locale
end

default_locale=(value) click to toggle source

# File lib/hundredth.rb, line 32
def default_locale=(value)
  I18n.config.default_locale = value
end

ordinal(number, locale = Thread.current[:locale] || I18n.config.default_locale) click to toggle source

# File lib/hundredth.rb, line 14
def ordinal(number, locale = Thread.current[:locale] || I18n.config.default_locale)
  begin
    number = number.to_int
  rescue StandardError
    raise HundredthError, I18n.t('hundredth.not_an_integer', number)
  end

  raise HundredthError, I18n.t('hundredth.less_than_one', number) if number < 1

  return beyond100(number, locale) if number > 100

  I18n.t 'hundredth.num_' + number.to_s, locale: locale
end

Private Class Methods

beyond100(number, locale) click to toggle source

# File lib/hundredth.rb, line 38
def beyond100(number, locale)
  case locale.to_s.split('-').first
  when 'en'
    beyond100_en number
  when 'es'
    raise NotImplementedError
  when 'fr'
    raise NotImplementedError
  else
    raise NotImplementedError
  end
end

beyond100_en(number) click to toggle source

Higher ordinals are not often written in words, unless they are round numbers (thousandth, millionth, billionth). They are written using digits and letters as described below. Here are some rules that should be borne in mind.

The suffixes -th, -st, -nd and -rd are occasionally written superscript above the number itself.

If the tens digit of a number is 1, then write “th” after the number. For example: 13th, 19th, 112th, 9,311th. If the tens digit is not equal to 1, then use the following table: If the units digit is: 0 1 2 3 4 5 6 7 8 9 write this after the number th st nd rd th th th th th th For example: 2nd, 7th, 20th, 23rd, 52nd, 135th, 301st. TODO: option to just return the ordinal indicator

# File lib/hundredth.rb, line 65
def beyond100_en(number)
  return "#{number}th" if tens_digit_is_a_one(number)

  case number % 10
  when 0, 4, 5, 6, 7, 8, 9
    "#{number}th"
  when 1
    "#{number}st"
  when 2
    "#{number}nd"
  when 3
    "#{number}rd"
  end
end

tens_digit_is_a_one(number) click to toggle source

# File lib/hundredth.rb, line 80
def tens_digit_is_a_one(number)
  (number > 10) && (((number / 10) % 10) == 1)
end