osu/osu.Game/Utils/ModUtils.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.
using System;
using System.Collections.Generic;
using System.Diagnostics;
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using System.Diagnostics.CodeAnalysis;
using System.Linq;
using osu.Framework.Bindables;
using osu.Game.Online.API;
using osu.Game.Rulesets;
using osu.Game.Rulesets.Mods;
#nullable enable
namespace osu.Game.Utils
{
/// <summary>
/// A set of utilities to handle <see cref="Mod"/> combinations.
/// </summary>
public static class ModUtils
{
/// <summary>
/// Checks that all <see cref="Mod"/>s are compatible with each-other, and that all appear within a set of allowed types.
/// </summary>
/// <remarks>
/// The allowed types must contain exact <see cref="Mod"/> types for the respective <see cref="Mod"/>s to be allowed.
/// </remarks>
/// <param name="combination">The <see cref="Mod"/>s to check.</param>
/// <param name="allowedTypes">The set of allowed <see cref="Mod"/> types.</param>
/// <returns>Whether all <see cref="Mod"/>s are compatible with each-other and appear in the set of allowed types.</returns>
public static bool CheckCompatibleSetAndAllowed(IEnumerable<Mod> combination, IEnumerable<Type> allowedTypes)
{
// Prevent multiple-enumeration.
var combinationList = combination as ICollection<Mod> ?? combination.ToArray();
return CheckCompatibleSet(combinationList, out _) && CheckAllowed(combinationList, allowedTypes);
}
/// <summary>
/// Checks that all <see cref="Mod"/>s in a combination are compatible with each-other.
/// </summary>
/// <param name="combination">The <see cref="Mod"/> combination to check.</param>
/// <returns>Whether all <see cref="Mod"/>s in the combination are compatible with each-other.</returns>
public static bool CheckCompatibleSet(IEnumerable<Mod> combination)
=> CheckCompatibleSet(combination, out _);
/// <summary>
/// Checks that all <see cref="Mod"/>s in a combination are compatible with each-other.
/// </summary>
/// <param name="combination">The <see cref="Mod"/> combination to check.</param>
/// <param name="invalidMods">Any invalid mods in the set.</param>
/// <returns>Whether all <see cref="Mod"/>s in the combination are compatible with each-other.</returns>
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public static bool CheckCompatibleSet(IEnumerable<Mod> combination, [NotNullWhen(false)] out List<Mod>? invalidMods)
{
var mods = FlattenMods(combination).ToArray();
invalidMods = null;
// ensure there are no duplicate mod definitions.
for (int i = 0; i < mods.Length; i++)
{
var candidate = mods[i];
for (int j = i + 1; j < mods.Length; j++)
{
var m = mods[j];
if (candidate.Equals(m))
{
invalidMods ??= new List<Mod>();
invalidMods.Add(m);
}
}
}
foreach (var mod in mods)
{
foreach (var type in mod.IncompatibleMods)
{
foreach (var invalid in mods.Where(m => type.IsInstanceOfType(m)))
{
if (invalid == mod)
continue;
invalidMods ??= new List<Mod>();
invalidMods.Add(invalid);
}
}
}
return invalidMods == null;
}
/// <summary>
/// Checks that all <see cref="Mod"/>s in a combination appear within a set of allowed types.
/// </summary>
/// <remarks>
/// The set of allowed types must contain exact <see cref="Mod"/> types for the respective <see cref="Mod"/>s to be allowed.
/// </remarks>
/// <param name="combination">The <see cref="Mod"/> combination to check.</param>
/// <param name="allowedTypes">The set of allowed <see cref="Mod"/> types.</param>
/// <returns>Whether all <see cref="Mod"/>s in the combination are allowed.</returns>
public static bool CheckAllowed(IEnumerable<Mod> combination, IEnumerable<Type> allowedTypes)
{
var allowedSet = new HashSet<Type>(allowedTypes);
return combination.SelectMany(FlattenMod)
.All(m => allowedSet.Contains(m.GetType()));
}
/// <summary>
/// Check the provided combination of mods are valid for a local gameplay session.
/// </summary>
/// <param name="mods">The mods to check.</param>
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/// <param name="invalidMods">Invalid mods, if any were found. Can be null if all mods were valid.</param>
/// <returns>Whether the input mods were all valid. If false, <paramref name="invalidMods"/> will contain all invalid entries.</returns>
public static bool CheckValidForGameplay(IEnumerable<Mod> mods, [NotNullWhen(false)] out List<Mod>? invalidMods)
{
mods = mods.ToArray();
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CheckCompatibleSet(mods, out invalidMods);
foreach (var mod in mods)
{
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if (mod.Type == ModType.System || !mod.HasImplementation || mod is MultiMod)
{
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invalidMods ??= new List<Mod>();
invalidMods.Add(mod);
}
}
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return invalidMods == null;
}
/// <summary>
/// Flattens a set of <see cref="Mod"/>s, returning a new set with all <see cref="MultiMod"/>s removed.
/// </summary>
/// <param name="mods">The set of <see cref="Mod"/>s to flatten.</param>
/// <returns>The new set, containing all <see cref="Mod"/>s in <paramref name="mods"/> recursively with all <see cref="MultiMod"/>s removed.</returns>
public static IEnumerable<Mod> FlattenMods(IEnumerable<Mod> mods) => mods.SelectMany(FlattenMod);
/// <summary>
/// Flattens a <see cref="Mod"/>, returning a set of <see cref="Mod"/>s in-place of any <see cref="MultiMod"/>s.
/// </summary>
/// <param name="mod">The <see cref="Mod"/> to flatten.</param>
/// <returns>A set of singular "flattened" <see cref="Mod"/>s</returns>
public static IEnumerable<Mod> FlattenMod(Mod mod)
{
if (mod is MultiMod multi)
{
foreach (var m in multi.Mods.SelectMany(FlattenMod))
yield return m;
}
else
yield return mod;
}
/// <summary>
/// Returns the underlying value of the given mod setting object.
/// Used in <see cref="APIMod"/> for serialization and equality comparison purposes.
/// </summary>
/// <param name="setting">The mod setting.</param>
public static object GetSettingUnderlyingValue(object setting)
{
switch (setting)
{
case Bindable<double> d:
return d.Value;
case Bindable<int> i:
return i.Value;
case Bindable<float> f:
return f.Value;
case Bindable<bool> b:
return b.Value;
case IBindable u:
// A mod with unknown (e.g. enum) generic type.
var valueMethod = u.GetType().GetProperty(nameof(IBindable<int>.Value));
Debug.Assert(valueMethod != null);
return valueMethod.GetValue(u);
default:
// fall back for non-bindable cases.
return setting;
}
}
/// <summary>
/// Verifies all proposed mods are valid for a given ruleset and returns instantiated <see cref="Mod"/>s for further processing.
/// </summary>
/// <param name="ruleset">The ruleset to verify mods against.</param>
/// <param name="proposedMods">The proposed mods.</param>
/// <param name="valid">Mods instantiated from <paramref name="proposedMods"/> which were valid for the given <paramref name="ruleset"/>.</param>
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/// <returns>Whether all <paramref name="proposedMods"/> were valid for the given <paramref name="ruleset"/>.</returns>
public static bool InstantiateValidModsForRuleset(Ruleset ruleset, IEnumerable<APIMod> proposedMods, out List<Mod> valid)
{
valid = new List<Mod>();
bool proposedWereValid = true;
foreach (var apiMod in proposedMods)
{
try
{
// will throw if invalid
valid.Add(apiMod.ToMod(ruleset));
}
catch
{
proposedWereValid = false;
}
}
return proposedWereValid;
}
}
}