Class: GengoSearch::Gengo

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

Constant Summary collapse

ERAS = 
CSV.read(File.expand_path('../data/era_names.csv', __FILE__))

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ad_year = nil) ⇒ Gengo

Returns a new instance of Gengo.



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# File 'lib/gengo_search.rb', line 10

def initialize(ad_year = nil)
  if ad_year.nil? || !(ad_year.is_a?(Integer)) || ad_year < 645 || ad_year > 9999 then
    raise ArgumentError, "Please set a correct number(645~9999)"
  else
    started_year_index = search(ad_year)
    setTargetEra(started_year_index, ad_year)
  end
end

Instance Attribute Details

#hiragana ⇒ Object (readonly)

Returns the value of attribute hiragana.



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# File 'lib/gengo_search.rb', line 6

def hiragana
  @hiragana
end

#kanji ⇒ Object (readonly)

Returns the value of attribute kanji.



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# File 'lib/gengo_search.rb', line 6

def kanji
  @kanji
end

#romaji ⇒ Object (readonly)

Returns the value of attribute romaji.



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# File 'lib/gengo_search.rb', line 6

def romaji
  @romaji
end

#year ⇒ Object (readonly)

Returns the value of attribute year.



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# File 'lib/gengo_search.rb', line 6

def year
  @year
end

Instance Method Details

#search(target = 0) ⇒ Object

Using Binary Search



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# File 'lib/gengo_search.rb', line 20

def search(target = 0)

  head = 0
  tail = ERAS.count - 1

  if ERAS[tail][0].to_i <= target then
    return tail
  else
    while head <= tail

      center = (head + tail) / 2
  
      if ERAS[center][0].to_i <= target && target < ERAS[center + 1][0].to_i then
        return center
      elsif ERAS[center][0].to_i < target
        head = center + 1
      else
        tail = center - 1
      end
    end
  end


end

#setTargetEra(started_year_index = 0, ad_year = 0) ⇒ Object 



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# File 'lib/gengo_search.rb', line 45

def setTargetEra(started_year_index = 0, ad_year = 0)
  year = ad_year - ERAS[started_year_index][0].to_i + 1
  if year == 1 then
    @kanji = "#{ERAS[started_year_index][1]} 元年"
    @hiragana = "#{ERAS[started_year_index][3]} がんねん"
    @romaji = "#{ERAS[started_year_index][2]} GANNEN"
  else
    @kanji = "#{ERAS[started_year_index][1]} #{year}年"
    @romaji = "#{ERAS[started_year_index][2]} #{year}NEN"
    @hiragana = "#{ERAS[started_year_index][3]} #{year}ねん"
  end
end