osu/osu.Game/Beatmaps/MetadataUtils.cs
2021-10-27 13:04:41 +09:00

48 lines
1.9 KiB
C#

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
#nullable enable
using System.Linq;
using System.Text;
namespace osu.Game.Beatmaps
{
/// <summary>
/// Groups utility methods used to handle beatmap metadata.
/// </summary>
public static class MetadataUtils
{
/// <summary>
/// Returns <see langword="true"/> if the character <paramref name="c"/> can be used in <see cref="BeatmapMetadata.Artist"/> and <see cref="BeatmapMetadata.Title"/> fields.
/// Characters not matched by this method can be placed in <see cref="BeatmapMetadata.ArtistUnicode"/> and <see cref="BeatmapMetadata.TitleUnicode"/>.
/// </summary>
public static bool IsRomanised(char c) => c <= 0xFF;
/// <summary>
/// Returns <see langword="true"/> if the string <paramref name="str"/> can be used in <see cref="BeatmapMetadata.Artist"/> and <see cref="BeatmapMetadata.Title"/> fields.
/// Strings not matched by this method can be placed in <see cref="BeatmapMetadata.ArtistUnicode"/> and <see cref="BeatmapMetadata.TitleUnicode"/>.
/// </summary>
public static bool IsRomanised(string? str) => string.IsNullOrEmpty(str) || str.All(IsRomanised);
/// <summary>
/// Returns a copy of <paramref name="str"/> with all characters that do not match <see cref="IsRomanised(char)"/> removed.
/// </summary>
public static string StripNonRomanisedCharacters(string? str)
{
if (string.IsNullOrEmpty(str))
return string.Empty;
var stringBuilder = new StringBuilder(str.Length);
foreach (char c in str)
{
if (IsRomanised(c))
stringBuilder.Append(c);
}
return stringBuilder.ToString().Trim();
}
}
}