osu/osu.Game/Beatmaps/Formats/LegacyDecoder.cs

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// 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.
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using System;
using System.Collections.Generic;
using osu.Framework.Extensions;
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using osu.Framework.Logging;
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using osu.Game.Audio;
using osu.Game.Beatmaps.ControlPoints;
using osu.Game.IO;
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using osuTK.Graphics;
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namespace osu.Game.Beatmaps.Formats
{
public abstract class LegacyDecoder<T> : Decoder<T>
where T : new()
{
protected readonly int FormatVersion;
protected LegacyDecoder(int version)
{
FormatVersion = version;
}
protected override void ParseStreamInto(LineBufferedReader stream, T output)
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{
Section section = Section.None;
string line;
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while ((line = stream.ReadLine()) != null)
{
if (ShouldSkipLine(line))
continue;
if (line.StartsWith('[') && line.EndsWith(']'))
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{
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if (!Enum.TryParse(line[1..^1], out section))
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{
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Logger.Log($"Unknown section \"{line}\" in \"{output}\"");
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section = Section.None;
}
continue;
}
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try
{
ParseLine(output, section, line);
}
catch (Exception e)
{
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Logger.Log($"Failed to process line \"{line}\" into \"{output}\": {e.Message}", LoggingTarget.Runtime, LogLevel.Important);
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}
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}
}
protected virtual bool ShouldSkipLine(string line) => string.IsNullOrWhiteSpace(line) || line.AsSpan().TrimStart().StartsWith("//".AsSpan(), StringComparison.Ordinal);
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protected virtual void ParseLine(T output, Section section, string line)
{
line = StripComments(line);
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switch (section)
{
case Section.Colours:
handleColours(output, line);
return;
}
}
protected string StripComments(string line)
{
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var index = line.AsSpan().IndexOf("//".AsSpan());
if (index > 0)
return line.Substring(0, index);
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return line;
}
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private void handleColours(T output, string line)
{
var pair = SplitKeyVal(line);
bool isCombo = pair.Key.StartsWith(@"Combo");
string[] split = pair.Value.Split(',');
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if (split.Length != 3 && split.Length != 4)
throw new InvalidOperationException($@"Color specified in incorrect format (should be R,G,B or R,G,B,A): {pair.Value}");
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Color4 colour;
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try
{
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colour = new Color4(byte.Parse(split[0]), byte.Parse(split[1]), byte.Parse(split[2]), split.Length == 4 ? byte.Parse(split[3]) : (byte)255);
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}
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catch
{
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throw new InvalidOperationException(@"Color must be specified with 8-bit integer components");
}
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if (isCombo)
{
if (!(output is IHasComboColours tHasComboColours)) return;
tHasComboColours.AddComboColours(colour);
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}
else
{
if (!(output is IHasCustomColours tHasCustomColours)) return;
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tHasCustomColours.CustomColours[pair.Key] = colour;
}
}
protected KeyValuePair<string, string> SplitKeyVal(string line, char separator = ':')
{
var split = line.Split(separator, 2);
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return new KeyValuePair<string, string>
(
split[0].Trim(),
split.Length > 1 ? split[1].Trim() : string.Empty
);
}
protected string CleanFilename(string path) => path.Trim('"').ToStandardisedPath();
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protected enum Section
{
None,
General,
Editor,
Metadata,
Difficulty,
Events,
TimingPoints,
Colours,
HitObjects,
Variables,
Fonts
}
internal class LegacyDifficultyControlPoint : DifficultyControlPoint
{
public LegacyDifficultyControlPoint()
{
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SpeedMultiplierBindable.Precision = double.Epsilon;
}
}
internal class LegacySampleControlPoint : SampleControlPoint
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{
public int CustomSampleBank;
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public override HitSampleInfo ApplyTo(HitSampleInfo hitSampleInfo)
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{
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var baseInfo = base.ApplyTo(hitSampleInfo);
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if (string.IsNullOrEmpty(baseInfo.Suffix) && CustomSampleBank > 1)
baseInfo.Suffix = CustomSampleBank.ToString();
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return baseInfo;
}
public override bool EquivalentTo(ControlPoint other) =>
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base.EquivalentTo(other) && other is LegacySampleControlPoint otherTyped &&
CustomSampleBank == otherTyped.CustomSampleBank;
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}
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}
}