kana.json

{
    "kana": [
        {"hiragana": "あ","romaji":"a", "value": 1},
        {"hiragana": "い","romaji":"i", "value": 2},
        {"hiragana": "う","romaji":"u", "value": 3},
        {"hiragana": "え","romaji":"r", "value": 4},
        {"hiragana": "お","romaji":"o", "value": 5},
        {"hiragana": "か","romaji":"ka", "value": 6},
        {"hiragana": "き","romaji":"ki", "value": 7},
        {"hiragana": "く","romaji":"ku", "value": 8},
        {"hiragana": "け","romaji":"ke", "value": 9},
        {"hiragana": "こ","romaji":"ko", "value": 10},
        {"hiragana": "さ","romaji":"sa", "value": 11},
        {"hiragana": "し","romaji":"shi", "value": 12},
        {"hiragana": "す","romaji":"su", "value": 13},
        {"hiragana": "せ","romaji":"se", "value": 14},
        {"hiragana": "そ","romaji":"so", "value": 15},
        {"hiragana": "た","romaji":"ta", "value": 16},
        {"hiragana": "ち","romaji":"chi", "value": 17},
        {"hiragana": "つ","romaji":"tsu", "value": 18},
        {"hiragana": "て","romaji":"te", "value": 19},
        {"hiragana": "と","romaji":"to", "value": 20},
        {"hiragana": "な","romaji":"na", "value": 21},
        {"hiragana": "に","romaji":"ni", "value": 22},
        {"hiragana": "ぬ","romaji":"nu", "value": 23},
        {"hiragana": "ね","romaji":"ne", "value": 24},
        {"hiragana": "の","romaji":"no", "value": 25},
        {"hiragana": "は","romaji":"ha", "value": 26},
        {"hiragana": "ひ","romaji":"hi", "value": 27},
        {"hiragana": "ふ","romaji":"fu", "value": 28},
        {"hiragana": "へ","romaji":"he", "value": 29},
        {"hiragana": "ほ","romaji":"ho", "value": 30},
        {"hiragana": "ま","romaji":"ma", "value": 31},
        {"hiragana": "み","romaji":"mi", "value": 32},
        {"hiragana": "む","romaji":"mu", "value": 33},
        {"hiragana": "め","romaji":"me", "value": 34},
        {"hiragana": "も","romaji":"mo", "value": 35},
        {"hiragana": "や","romaji":"ya", "value": 36},
        {"hiragana": "ゆ","romaji":"yu", "value": 37},
        {"hiragana": "よ","romaji":"yo", "value": 38},
        {"hiragana": "ら","romaji":"ra", "value": 39},
        {"hiragana": "り","romaji":"ri", "value": 40},
        {"hiragana": "る","romaji":"ru", "value": 41},
        {"hiragana": "れ","romaji":"re", "value": 42},
        {"hiragana": "ろ","romaji":"ro", "value": 43},
        {"hiragana": "わ","romaji":"wa", "value": 44},
        {"hiragana": "を","romaji":"wo", "value": 45},
        {"hiragana": "ん","romaji":"n", "value": 46}
    ]
}

zaregoto.cr

require "json"

class Kana
  include JSON::Serializable
  @[JSON::Field(key: "hiragana")]
  getter hiragana : String
  @[JSON::Field(key: "romaji")]
  getter romaji : String
  @[JSON::Field(key: "value")]
  getter value : Int32
end

class Kanas
  include JSON::Serializable
  @[JSON::Field(key: "kana")]
  @kana : Array(Kana)

  def hiragana(kana)
    @kana.find { |i| kana == i.hiragana } 
  end
  def romaji(character)
    @kana.find { |i| kana == i.character } 
  end
  def value(number : Int32)
    if number > @kana.size
      raise "no matching kana!"
    end
    @kana[number] 
  end
  def size
    @kana.size
  end
end

kana_json = File.read(Path.posix "./src/kana.json")
kanas = Kanas.from_json(kana_json)
vowels = ['a', 'i', 'o', 'u', 'e']

output_path = Path.posix "./output.json"
File.open(output_path, "w") { |f| f << %Q({"names": [\n) }

combinations = (1..kanas.size).to_a
combinations.repeated_permutations(8).each do |combination|
  kana = combination.map { |x| kanas.value(x-1) }
  hiragana = kana.map { |x| x.hiragana }.join 
  romaji = kana.map { |x| x.romaji }.join 

  if (romaji.chars & vowels).size == 8 && romaji.chars.size == 15 && combination.sum == 134
    File.open(output_path, "a") { |f| f << %Q({"hiragana": "#{hiragana}", "romaji": "#{romaji}"},\n) }
  end
end
File.open(output_path, "a") { |f| f << "]}" }