public static string ToHiragana(string input, WanaKanaOptions?options = null)
{
if (input is null)
{
throw new ArgumentNullException(nameof(input));
}
options ??= new WanaKanaOptions();
if (input.Length == 0)
{
return(string.Empty);
}
if (options.PassRomaji)
{
return(KanaConverters.KatakanaToHiragana(input));
}
if (MixedChecker.IsMixed(input))
{
var convertedKatakana = KanaConverters.KatakanaToHiragana(input);
return(KanaConverters.ToKana(convertedKatakana.ToLowerInvariant(), options));
}
if (RomajiChecker.IsRomaji(input) || SpecialCharacterChecker.IsEnglishPunctuation(input[0]))
{
return(KanaConverters.ToKana(input.ToLowerInvariant(), options));
}
return(KanaConverters.KatakanaToHiragana(input));
}
private static SplitToken[] SplitIntoRomaji(string input, WanaKanaOptions options)
{
var map = KanaToRomajiMap.GetKanaToRomajiTree(options);
if (options.CustomRomajiMapping != null)
{
map = map.Clone();
map.AddRange(options.CustomRomajiMapping);
}
return(TrieHelpers.ApplyTrie(KanaConverters.KatakanaToHiragana(input, true), map, options.ImeMode == ImeMode.None));
}