Class: Libruby::UnitConverterUtils

Inherits:
Object
  • Object
show all
Defined in:
lib/libruby/unit_converter.rb

Class Method Summary collapse

Class Method Details

.comma(str) ⇒ Object 



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# File 'lib/libruby/unit_converter.rb', line 14

def self.comma(str)
  #http://rubytips86.hatenablog.com/entry/2014/03/28/153843
  str.gsub(/(\d)(?=\d{3}+$)/, '\\1,') #=> "1,234,567,890"
end

.ja(str) ⇒ Object 



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# File 'lib/libruby/unit_converter.rb', line 30

def self.ja(str)
  units = %w(万 億 兆 京 垓 予 穣 溝 澗 正 裁 極 恒河沙 阿僧祇 那由多 不可思議 無量大数 洛叉 倶胝)
  
  numbers = []
  str.each_char {|num| numbers << num.to_i }
  # 1234567
  number_blocks = numbers.reverse.each_slice(4).to_a
  # [7, 6, 5, 4], [3, 2, 1], 
  result = ''
  number_blocks.each_with_index do |block, index|
    u = index > 0 ? units[index - 1] : ''
    result = block.reverse.join + u + result
  end
  result.sub!(/万0+/, '万')
  result 
end

.to_comma_s(num) ⇒ Object 



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# File 'lib/libruby/unit_converter.rb', line 19

def self.to_comma_s(num)
  s = to_s(num)
  result = nil
  if s =~ /(\d+)(\.\d+)/
    result = comma($1) + $2
  else
    result = comma(s)
  end
  result
end

.to_ja_s(num) ⇒ Object 



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# File 'lib/libruby/unit_converter.rb', line 47

def self.to_ja_s(num)
  s = to_s(num)      
  if s =~ /(\d+)(\.\d+)/
    result = ja($1) + $2
  else
    result = ja(s)
  end
  result
end

.to_s(num) ⇒ Object 



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# File 'lib/libruby/unit_converter.rb', line 7

def self.to_s(num)
  #https://stackoverflow.com/questions/18533026/trim-a-trailing-0
  # 単なる数値として返す。ただし少数以下のゼロは削除。
  i, f = num.to_i, num.to_f
  i == f ? i.to_s : f.to_s
end