【C#】カタカナをひらがなに変換する

今回はunityを使っています。

また、本記事は『Microsoft.VisualBasic』を使わない方法で解説していきます。

Microsoft.VisualBasicを使ったほうがスマートにかけますが、環境依存したくないという方はこちらでいいかなと思います。

そして、今回は「入力フォームにカタカナを入れてボタン押下時にコンソールに入力文字列を表示する」という内容でやっていきます。

カタカナをひらがなに変換する

今回のコードの処理内容は主に3つです。

【11～20行目】
ボタン押下時にひらがなに変換した文字列をコンソールに表示する。

【26～37行目】
複数のカタカナを1文字ずつひらがなに変換し、その変換後の値を返す。

【42～93行目】
カタカナをキーにして、対応するひらがなを返すDictionaryを作成する。

private Dictionary<string, string> _hiraganaConverter = new Dictionary<string, string>();

void Start()
{
    CreateHiraganaConverter();
}

/// <Summary>
/// ボタン押下時に呼び出される処理
/// </Summary>
public void OnButton()
{
    GameObject objCanvas = GameObject.Find("Canvas");
    GameObject objInputField = objCanvas.transform.Find("InputField").gameObject;

    GameObject objInputFieldText = objInputField.transform.Find("Text").gameObject;
    Text inputFieldText = objInputFieldText.GetComponent<Text>();

    Debug.Log(ConvertHiragana(inputFieldText.text));
}


/// <Summary>
/// 複数のカタガナをひらがなに変換して返す
/// </Summary>
private string ConvertHiragana(string textValue)
{
    string afterTextValue = "";

    for (int i = 0; i < textValue.Length; i++)
    {
        string s = _hiraganaConverter[textValue[i].ToString()];
        afterTextValue += s;
    }

    return afterTextValue;
}

/// <Summary>
/// カタカナをキーにひらがなを返すDictionaryを作成
/// </Summary>
private void CreateHiraganaConverter()
{

    var hiraganaArray = new string[15, 5]
    {
        { "あ","い","う","え","お" },
        { "か","き","く","け","こ" },
        { "さ","し","す","せ","そ" },
        { "た","ち","つ","て","と" },
        { "な","に","ぬ","ね","の" },
        { "は","ひ","ふ","へ","ほ" },
        { "ま","み","む","め","も" },
        { "や","っ","ゆ","空白２","よ" },
        { "ら","り","る","れ","ろ" },
        { "わ","空白３","を","空白４","ん" },
        { "が","ぎ","ぐ","げ","ご" },
        { "ざ","じ","ず","ぜ","ぞ" },
        { "だ","ぢ","づ","で","ど" },
        { "ば","び","ぶ","べ","ぼ" },
        { "ぱ","ぴ","ぷ","ぺ","ぽ" }
    };

    var katakanaArray = new string[15, 5]
    {
        { "ア","イ","ウ","エ","オ" },
        { "カ","キ","ク","ケ","コ" },
        { "サ","シ","ス","セ","ソ" },
        { "タ","チ","ツ","テ","ト" },
        { "ナ","ニ","ヌ","ネ","ノ" },
        { "ハ","ヒ","フ","ヘ","ホ" },
        { "マ","ミ","ム","メ","モ" },
        { "ヤ","ッ","ユ","空白２","ヨ" },
        { "ラ","リ","ル","レ","ロ" },
        { "ワ","空白３","ヲ","空白４","ン" },
        { "ガ","ギ","グ","ゲ","ゴ" },
        { "ザ","ジ","ズ","ゼ","ゾ" },
        { "ダ","ヂ","ヅ","デ","ド" },
        { "バ","ビ","ブ","ベ","ボ" },
        { "パ","ピ","プ","ペ","ポ" }
    };


    int katakanaLineCount = katakanaArray.GetLength(0);
    for (int i = 0; i < katakanaLineCount; i++)
    {
        int targetLineCount = katakanaArray.GetLength(1);
        for (int j = 0; j < targetLineCount; j++)
        {
            _hiraganaConverter.Add(katakanaArray[i, j] , hiraganaArray[i, j]);
        }
    }
}

private Dictionary<string, string> _hiraganaConverter = new Dictionary<string, string>();

void Start()

{

CreateHiraganaConverter();

}

/// <Summary>

/// ボタン押下時に呼び出される処理

/// </Summary>

public void OnButton()

{

GameObject objCanvas = GameObject.Find("Canvas");

GameObject objInputField = objCanvas.transform.Find("InputField").gameObject;

GameObject objInputFieldText = objInputField.transform.Find("Text").gameObject;

Text inputFieldText = objInputFieldText.GetComponent<Text>();

Debug.Log(ConvertHiragana(inputFieldText.text));

}

/// <Summary>

/// 複数のカタガナをひらがなに変換して返す

/// </Summary>

private string ConvertHiragana(string textValue)

{

string afterTextValue = "";

for (int i = 0; i < textValue.Length; i++)

{

string s = _hiraganaConverter[textValue[i].ToString()];

afterTextValue += s;

}

return afterTextValue;

}

/// <Summary>

/// カタカナをキーにひらがなを返すDictionaryを作成

/// </Summary>

private void CreateHiraganaConverter()

{

var hiraganaArray = new string[15, 5]

{

{ "あ","い","う","え","お" },

{ "か","き","く","け","こ" },

{ "さ","し","す","せ","そ" },

{ "た","ち","つ","て","と" },

{ "な","に","ぬ","ね","の" },

{ "は","ひ","ふ","へ","ほ" },

{ "ま","み","む","め","も" },

{ "や","っ","ゆ","空白２","よ" },

{ "ら","り","る","れ","ろ" },

{ "わ","空白３","を","空白４","ん" },

{ "が","ぎ","ぐ","げ","ご" },

{ "ざ","じ","ず","ぜ","ぞ" },

{ "だ","ぢ","づ","で","ど" },

{ "ば","び","ぶ","べ","ぼ" },

{ "ぱ","ぴ","ぷ","ぺ","ぽ" }

};

var katakanaArray = new string[15, 5]

{

{ "ア","イ","ウ","エ","オ" },

{ "カ","キ","ク","ケ","コ" },

{ "サ","シ","ス","セ","ソ" },

{ "タ","チ","ツ","テ","ト" },

{ "ナ","ニ","ヌ","ネ","ノ" },

{ "ハ","ヒ","フ","ヘ","ホ" },

{ "マ","ミ","ム","メ","モ" },

{ "ヤ","ッ","ユ","空白２","ヨ" },

{ "ラ","リ","ル","レ","ロ" },

{ "ワ","空白３","ヲ","空白４","ン" },

{ "ガ","ギ","グ","ゲ","ゴ" },

{ "ザ","ジ","ズ","ゼ","ゾ" },

{ "ダ","ヂ","ヅ","デ","ド" },

{ "バ","ビ","ブ","ベ","ボ" },

{ "パ","ピ","プ","ペ","ポ" }

};

int katakanaLineCount = katakanaArray.GetLength(0);

for (int i = 0; i < katakanaLineCount; i++)

{

int targetLineCount = katakanaArray.GetLength(1);

for (int j = 0; j < targetLineCount; j++)

{

_hiraganaConverter.Add(katakanaArray[i, j] , hiraganaArray[i, j]);

}

入力フォームに「アイウエオ」と入力し、ＯＫボタンを押すと、コンソールに「あいうえお」と表示されるようになります。