用 Ruby 寫的小東西

five_mice_convert.rb

#!/usr/bin/env ruby
# 五鼠遁起法

class GanZhiTable
  TIAN_GAN = "甲乙丙丁戊己庚辛壬癸".split("").freeze
  DI_ZHI = "子丑寅卯辰巳午未申酉戌亥".split("").freeze
  
  def tian_gan(index)
    index = index - TIAN_GAN.size if index >= TIAN_GAN.size

    TIAN_GAN[index]
  end

  def tian_gan_index(tian_gan)
    TIAN_GAN.find_index(tian_gan)
  end
  
  def di_zhi(index)
    index = index - DI_ZHI.size if index >= DI_ZHI.size

    DI_ZHI[index]
  end

  def di_zhi_index(di_zhi)
    DI_ZHI.find_index(di_zhi)
  end
end

class HourGanZhi
  attr_reader :full_gan_zhi
  
  def initialize(year_gan, hour)
    @year_gan = year_gan
    @hour = hour - 1

    @table = GanZhiTable.new
    
    calculate
  end

  def calculate
    first_hour_tian_gan = case @year_gan
    when "甲", "己" then "甲"
    when "乙", "庚" then "丙"
    when "丙", "辛" then "戊"
    when "丁", "壬" then "庚"
    else "壬"
    end

    hour_gan_offset = @table.tian_gan_index(first_hour_tian_gan)
    tian_gan_number = hour_gan_offset + @hour
    
    @full_gan_zhi = "#{@table.tian_gan(tian_gan_number)}#{@table.di_zhi(@hour)}"
  end
end

t = GanZhiTable.new
t.tian_gan((1 - 1)) #=> 甲
t.tian_gan((5 - 1)) #=> 戊
t.tian_gan((10 - 1)) #=> 癸
t.tian_gan((13 - 1)) #=> 丙
t.tian_gan((14 - 1)) #=> 丁

t.di_zhi((1 - 1)) #=> 子
t.di_zhi((4 - 1)) #=> 卯
t.di_zhi((8 - 1)) #=> 未
t.di_zhi((13 - 1)) #=> 子

puts HourGanZhi.new("己", 1).full_gan_zhi
puts HourGanZhi.new("己", 3).full_gan_zhi
puts HourGanZhi.new("己", 5).full_gan_zhi
puts HourGanZhi.new("戊", 1).full_gan_zhi
puts HourGanZhi.new("戊", 3).full_gan_zhi
puts HourGanZhi.new("戊", 5).full_gan_zhi

five_tigers_convert.rb

#!/usr/bin/env ruby
# 五虎遁起法

class MonthGanZhi
  TIAN_GAN = "甲乙丙丁戊己庚辛壬癸".split("")
  DI_ZHI = "寅卯辰巳午未申酉戌亥子丑".split("")

  attr_reader :full_gan_zhi
  
  def initialize(year_gan, month)
    @year_gan = year_gan
    @month = month - 1

    calculate
  end

  def calculate
    first_month_tian_gan = case @year_gan
    when "甲", "己" then "丙"
    when "乙", "庚" then "戊"
    when "丙", "辛" then "庚"
    when "丁", "壬" then "壬"
    else "甲"
    end

    month_gan_offset = TIAN_GAN.find_index(first_month_tian_gan)
    tian_gan_number = month_gan_offset + @month
    
    @full_gan_zhi = "#{TIAN_GAN[tian_gan_number]}#{DI_ZHI[@month]}"
  end
end

puts MonthGanZhi.new("己", 1).full_gan_zhi
puts MonthGanZhi.new("己", 3).full_gan_zhi
puts MonthGanZhi.new("己", 5).full_gan_zhi
puts MonthGanZhi.new("戊", 1).full_gan_zhi
puts MonthGanZhi.new("戊", 3).full_gan_zhi
puts MonthGanZhi.new("戊", 5).full_gan_zhi

to_year_pilliar.rb

#!/usr/bin/env ruby

class YearGanZhi
  TIAN_GAN = "甲乙丙丁戊己庚辛壬癸".split("")
  DI_ZHI   = "子丑寅卯辰巳午未申酉戌亥".split("")

  attr_reader :full_gan_zhi

  def initialize(year, western_year = false)
    @year = year
    @year -= 1911 if western_year == true
    @full_gan_zhi = ""

    calculate
  end

  def calculate
    tian_gan_number = @year - @year.truncate(-1) - 3
    di_zhi_number = @year % 12 - 1

    @full_gan_zhi = "#{TIAN_GAN[tian_gan_number]}#{DI_ZHI[di_zhi_number]}"
  end
end

puts YearGanZhi.new(73).full_gan_zhi
puts YearGanZhi.new(77).full_gan_zhi
puts YearGanZhi.new(81).full_gan_zhi
puts YearGanZhi.new(5).full_gan_zhi