module KanaRow

# File lib/kana_row.rb, line 36
def kana_row(marked_to_plain: true, include_special: true)
  kana = self.chr.han_to_zen
  return unless kana.kana?

  if is_hiragana = kana.hiragana?
    kana = kana.katakana
  end

  row = kanas_map(include_special: include_special).find{|_, v| v.include?(kana) }&.first
  row = MARKED_KANA_ROWS.fetch(row, row) if marked_to_plain
  row = row&.hiragana if is_hiragana

  row
end

# File lib/kana_row.rb, line 53
def kanas_map(include_special: true)
  special = include_special || {}
  special = SPECIAL_KANAS_MAP unless special.is_a? Hash

  KANAS_MAP.merge(special) do |key, this_val, other_val|
    other_val =
      case other_val
      when String then other_val.split('')
      when Array then other_val
      else []
      end
    this_val + other_val
  end
end