Module: HrLite::AmountInWords

Defined in:
lib/hr_lite/amount_in_words.rb

Overview

Indian-system amount in words (crore/lakh/thousand). A PORO — not a view helper — because the slip PDF template is rendered by HOST code (config.render_pdf), where engine helper modules are not in scope.

Constant Summary collapse

ONES = 
%w[zero one two three four five six seven eight nine ten eleven twelve thirteen fourteen
fifteen sixteen seventeen eighteen nineteen].freeze
TENS = 
%w[zero ten twenty thirty forty fifty sixty seventy eighty ninety].freeze
SCALES = 
[ [ 10_000_000, "crore" ], [ 100_000, "lakh" ], [ 1000, "thousand" ], [ 100, "hundred" ] ].freeze

Class Method Summary collapse

Class Method Details

.groups(rupees) ⇒ Object 



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# File 'lib/hr_lite/amount_in_words.rb', line 24

def groups(rupees)
  parts = []
  SCALES.each do |divisor, label|
    next unless rupees >= divisor

    # The crore group is unbounded — every later group is reduced below
    # 100 by the preceding modulo, but this one is not, and two_digit
    # only knows 0..99. Recurse for anything above a hundred crore.
    count = rupees / divisor
    spelled = count > 99 ? groups(count).join(" ") : two_digit(count)
    parts << "#{spelled} #{label}"
    rupees %= divisor
  end
  parts << two_digit(rupees) if rupees.positive?
  parts
end

.two_digit(number) ⇒ Object 



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# File 'lib/hr_lite/amount_in_words.rb', line 41

def two_digit(number)
  return ONES[number] if number < 20

  [ TENS[number / 10], number % 10 == 0 ? nil : ONES[number % 10] ].compact.join("-")
end

.words(amount) ⇒ Object 



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# File 'lib/hr_lite/amount_in_words.rb', line 13

def words(amount)
  rupees = Money.round_rupee(amount).to_i
  return "Zero rupees" if rupees.zero?

  # A negative amount rendered as bare " rupees": no group was >= its
  # divisor, so nothing was ever appended.
  sentence = groups(rupees.abs).join(" ")
  sentence = "minus #{sentence}" if rupees.negative?
  "#{sentence.capitalize} rupees"
end