Class: Figures::German

Inherits:
Object
  • Object
show all
Defined in:
lib/figures/german.rb

Constant Summary collapse

WORDS = 
{
  copula: "und",
  digits: %w[null ein zwei drei vier fünf sechs sieben acht neun],
  tens: %w[eine zehn zwanzig dreißig vierzig fünfzig sechzig siebzig achzig neunzig],
  exponents: %w[hundert tausend million milliarden billion billiarden trillion trilliarden quadrillionen quadrilliarden quintillion sextillion sextilliarden]
}.freeze

Instance Method Summary collapse

Constructor Details

#initialize(number) ⇒ German

Returns a new instance of German.



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# File 'lib/figures/german.rb', line 10

def initialize(number)
  @number = number.to_i
end

Instance Method Details

#handle_exceptions(word) ⇒ Object 



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# File 'lib/figures/german.rb', line 77

def handle_exceptions(word)
  word = word.gsub('einzehn', 'elf')
  word = word.gsub('zweizehn', 'zwölf')
  word = word.gsub('sechszehn', 'sechzehn')
  word = word.gsub('siebenzehn', 'siebzehn')
end

#parse ⇒ Object 



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# File 'lib/figures/german.rb', line 14

def parse
  return WORDS[:digits][@number] if @number < 10 && @number >= 0

  number_string = @number.to_s.reverse.scan(/.{1,3}/).map.with_index{ |number_part, index|
    parse_triple(number_part.reverse.to_i, index)
  }.reverse.join

  number_string.sub! /^und/, '' # TODO investigate

  if @number < 0
    "minus #{number_string}"
  else
    number_string
  end
end

#parse_triple(number, triple_index) ⇒ Object 



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# File 'lib/figures/german.rb', line 30

def parse_triple(number, triple_index)
  temp_number = number.abs
  number_word = ""
  temp_tens   = ""

  return 'eins' if temp_number == 1 && triple_index == 0 # FIXME 

  while temp_number > 0
    decimal_power = Math.log10(temp_number).floor
    number_base = 10 ** decimal_power
    number_tail = temp_number - (temp_number % number_base)
    digit = number_tail / number_base

    copula = ((digit > 1) ? WORDS[:copula] : "")
    leading_single = (triple_index >= 2 && digit == 1) ? WORDS[:tens][0].to_s : WORDS[:digits][digit].to_s

    if decimal_power == 2
      number_word << WORDS[:digits][digit].to_s << WORDS[:exponents][0].to_s
    end

    if decimal_power == 0 && !temp_tens.empty?
      number_word << WORDS[:digits][digit].to_s
    end

    if decimal_power == 0 && temp_tens.empty?
      number_word << copula << leading_single
    end

    if decimal_power == 1
      temp_tens << copula << WORDS[:tens][digit].to_s
    end

    temp_number = temp_number - number_tail
  end

  number_word << temp_tens

  if triple_index > 0
    number_word << WORDS[:exponents][triple_index].to_s
  end

  number_word = handle_exceptions(number_word)
  number_word = remove_wrong_leadings(number_word)

  number_word
end

#remove_wrong_leadings(word) ⇒ Object 



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# File 'lib/figures/german.rb', line 84

def remove_wrong_leadings(word)
  word.gsub(/^(und|null)/, '')
end