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osu-lazer/osu.Game/Beatmaps/Formats/Decoder.cs
Aergwyn c466296b14 reverted split at Decoder, moved logic down
I'm done experimenting, sorry
- `Decoder` only returns a "Beatmap"`Decoder` now
- "Storyboard"`Decoder` is retrieved from a "Beatmap"`Decoder`
- moved parse methods down in the hierarchy where I forgot to do that
- renamed `OsuLegacyDecoderTest` to `LegacyDecoderTest`
2017-12-01 22:05:01 +01:00

81 lines
2.8 KiB
C#

// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using System;
using System.Collections.Generic;
using System.IO;
using osu.Game.Storyboards;
namespace osu.Game.Beatmaps.Formats
{
public abstract class Decoder
{
private static readonly Dictionary<string, Type> decoders = new Dictionary<string, Type>();
static Decoder()
{
LegacyDecoder.Register();
}
/// <summary>
/// Retrieves a <see cref="Decoder"/> to parse a <see cref="Beatmap"/>.
/// </summary>
/// <param name="stream">A stream pointing to the <see cref="Beatmap"/>.</param>
public static Decoder GetDecoder(StreamReader stream)
{
if (stream == null)
throw new ArgumentNullException(nameof(stream));
string line;
do
{ line = stream.ReadLine()?.Trim(); }
while (line != null && line.Length == 0);
if (line == null || !decoders.ContainsKey(line))
throw new IOException(@"Unknown file format");
return (Decoder)Activator.CreateInstance(decoders[line], line);
}
/// <summary>
/// Adds the <see cref="Decoder"/> to the list of <see cref="Beatmap"/> and <see cref="Storyboard"/> decoder.
/// </summary>
/// <typeparam name="T">Type to decode a <see cref="Beatmap"/> with.</typeparam>
/// <param name="version">A string representation of the version.</param>
protected static void AddDecoder<T>(string version) where T : Decoder
{
decoders[version] = typeof(T);
}
/// <summary>
/// Retrieves a <see cref="Decoder"/> to parse a <see cref="Storyboard"/>
/// </summary>
public abstract Decoder GetStoryboardDecoder();
public virtual Beatmap DecodeBeatmap(StreamReader stream)
{
var beatmap = new Beatmap
{
BeatmapInfo = new BeatmapInfo
{
Metadata = new BeatmapMetadata(),
BaseDifficulty = new BeatmapDifficulty(),
},
};
ParseBeatmap(stream, beatmap);
return beatmap;
}
protected abstract void ParseBeatmap(StreamReader stream, Beatmap beatmap);
public virtual Storyboard DecodeStoryboard(StreamReader stream)
{
var storyboard = new Storyboard();
ParseStoryboard(stream, storyboard);
return storyboard;
}
protected abstract void ParseStoryboard(StreamReader stream, Storyboard storyboard);
}
}