mirror of https://github.com/ppy/osu
231 lines
11 KiB
C#
231 lines
11 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System;
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using System.Collections.Generic;
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using System.Diagnostics.CodeAnalysis;
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using System.Linq;
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using osu.Game.Online.API;
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using osu.Game.Rulesets;
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using osu.Game.Rulesets.Mods;
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namespace osu.Game.Utils
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{
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/// <summary>
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/// A set of utilities to handle <see cref="Mod"/> combinations.
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/// </summary>
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public static class ModUtils
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{
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/// <summary>
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/// Checks that all <see cref="Mod"/>s are compatible with each-other, and that all appear within a set of allowed types.
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/// </summary>
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/// <remarks>
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/// The allowed types must contain exact <see cref="Mod"/> types for the respective <see cref="Mod"/>s to be allowed.
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/// </remarks>
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/// <param name="combination">The <see cref="Mod"/>s to check.</param>
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/// <param name="allowedTypes">The set of allowed <see cref="Mod"/> types.</param>
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/// <returns>Whether all <see cref="Mod"/>s are compatible with each-other and appear in the set of allowed types.</returns>
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public static bool CheckCompatibleSetAndAllowed(IEnumerable<Mod> combination, IEnumerable<Type> allowedTypes)
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{
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// Prevent multiple-enumeration.
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var combinationList = combination as ICollection<Mod> ?? combination.ToArray();
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return CheckCompatibleSet(combinationList, out _) && CheckAllowed(combinationList, allowedTypes);
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}
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/// <summary>
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/// Checks that all <see cref="Mod"/>s in a combination are compatible with each-other.
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/// </summary>
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/// <param name="combination">The <see cref="Mod"/> combination to check.</param>
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/// <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)
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=> CheckCompatibleSet(combination, out _);
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/// <summary>
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/// Checks that all <see cref="Mod"/>s in a combination are compatible with each-other.
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/// </summary>
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/// <param name="combination">The <see cref="Mod"/> combination to check.</param>
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/// <param name="invalidMods">Any invalid mods in the set.</param>
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/// <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)
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{
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var mods = FlattenMods(combination).ToArray();
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invalidMods = null;
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// ensure there are no duplicate mod definitions.
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for (int i = 0; i < mods.Length; i++)
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{
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var candidate = mods[i];
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for (int j = i + 1; j < mods.Length; j++)
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{
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var m = mods[j];
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if (candidate.Equals(m))
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{
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invalidMods ??= new List<Mod>();
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invalidMods.Add(m);
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}
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}
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}
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foreach (var mod in mods)
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{
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foreach (var type in mod.IncompatibleMods)
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{
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foreach (var invalid in mods.Where(m => type.IsInstanceOfType(m)))
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{
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if (invalid == mod)
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continue;
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invalidMods ??= new List<Mod>();
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invalidMods.Add(invalid);
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}
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}
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}
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return invalidMods == null;
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}
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/// <summary>
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/// Checks that all <see cref="Mod"/>s in a combination appear within a set of allowed types.
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/// </summary>
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/// <remarks>
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/// The set of allowed types must contain exact <see cref="Mod"/> types for the respective <see cref="Mod"/>s to be allowed.
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/// </remarks>
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/// <param name="combination">The <see cref="Mod"/> combination to check.</param>
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/// <param name="allowedTypes">The set of allowed <see cref="Mod"/> types.</param>
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/// <returns>Whether all <see cref="Mod"/>s in the combination are allowed.</returns>
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public static bool CheckAllowed(IEnumerable<Mod> combination, IEnumerable<Type> allowedTypes)
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{
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var allowedSet = new HashSet<Type>(allowedTypes);
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return combination.SelectMany(FlattenMod)
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.All(m => allowedSet.Contains(m.GetType()));
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}
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/// <summary>
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/// Checks that all <see cref="Mod"/>s in a combination are valid for a local gameplay session.
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/// </summary>
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/// <param name="mods">The mods to check.</param>
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/// <param name="invalidMods">Invalid mods, if any were found. Will be null if all mods were valid.</param>
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/// <returns>Whether the input mods were all valid. If false, <paramref name="invalidMods"/> will contain all invalid entries.</returns>
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public static bool CheckValidForGameplay(IEnumerable<Mod> mods, [NotNullWhen(false)] out List<Mod>? invalidMods)
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{
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mods = mods.ToArray();
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// checking compatibility of multi mods would try to flatten them and return incompatible mods.
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// in gameplay context, we never want MultiMod selected in the first place, therefore check against it first.
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if (!checkValid(mods, m => !(m is MultiMod), out invalidMods))
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return false;
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if (!CheckCompatibleSet(mods, out invalidMods))
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return false;
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return checkValid(mods, m => m.HasImplementation, out invalidMods);
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}
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/// <summary>
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/// Checks that all <see cref="Mod"/>s in a combination are valid as "required mods" in a multiplayer match session.
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/// </summary>
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/// <param name="mods">The mods to check.</param>
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/// <param name="invalidMods">Invalid mods, if any were found. Will be null if all mods were valid.</param>
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/// <returns>Whether the input mods were all valid. If false, <paramref name="invalidMods"/> will contain all invalid entries.</returns>
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public static bool CheckValidRequiredModsForMultiplayer(IEnumerable<Mod> mods, [NotNullWhen(false)] out List<Mod>? invalidMods)
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{
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mods = mods.ToArray();
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// checking compatibility of multi mods would try to flatten them and return incompatible mods.
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// in gameplay context, we never want MultiMod selected in the first place, therefore check against it first.
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if (!checkValid(mods, m => !(m is MultiMod), out invalidMods))
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return false;
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if (!CheckCompatibleSet(mods, out invalidMods))
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return false;
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return checkValid(mods, m => m.Type != ModType.System && m.HasImplementation && m.ValidForMultiplayer, out invalidMods);
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}
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/// <summary>
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/// Checks that all <see cref="Mod"/>s in a combination are valid as "free mods" in a multiplayer match session.
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/// </summary>
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/// <remarks>
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/// Note that this does not check compatibility between mods,
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/// given that the passed mods are expected to be the ones to be allowed for the multiplayer match,
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/// not to be confused with the list of mods the user currently has selected for the multiplayer match.
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/// </remarks>
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/// <param name="mods">The mods to check.</param>
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/// <param name="invalidMods">Invalid mods, if any were found. Will be null if all mods were valid.</param>
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/// <returns>Whether the input mods were all valid. If false, <paramref name="invalidMods"/> will contain all invalid entries.</returns>
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public static bool CheckValidFreeModsForMultiplayer(IEnumerable<Mod> mods, [NotNullWhen(false)] out List<Mod>? invalidMods)
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=> checkValid(mods, m => m.Type != ModType.System && m.HasImplementation && m.ValidForMultiplayerAsFreeMod && !(m is MultiMod), out invalidMods);
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private static bool checkValid(IEnumerable<Mod> mods, Predicate<Mod> valid, [NotNullWhen(false)] out List<Mod>? invalidMods)
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{
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mods = mods.ToArray();
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invalidMods = null;
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foreach (var mod in mods)
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{
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if (!valid(mod))
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{
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invalidMods ??= new List<Mod>();
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invalidMods.Add(mod);
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}
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}
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return invalidMods == null;
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}
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/// <summary>
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/// Flattens a set of <see cref="Mod"/>s, returning a new set with all <see cref="MultiMod"/>s removed.
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/// </summary>
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/// <param name="mods">The set of <see cref="Mod"/>s to flatten.</param>
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/// <returns>The new set, containing all <see cref="Mod"/>s in <paramref name="mods"/> recursively with all <see cref="MultiMod"/>s removed.</returns>
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public static IEnumerable<Mod> FlattenMods(IEnumerable<Mod> mods) => mods.SelectMany(FlattenMod);
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/// <summary>
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/// Flattens a <see cref="Mod"/>, returning a set of <see cref="Mod"/>s in-place of any <see cref="MultiMod"/>s.
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/// </summary>
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/// <param name="mod">The <see cref="Mod"/> to flatten.</param>
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/// <returns>A set of singular "flattened" <see cref="Mod"/>s</returns>
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public static IEnumerable<Mod> FlattenMod(Mod mod)
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{
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if (mod is MultiMod multi)
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{
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foreach (var m in multi.Mods.SelectMany(FlattenMod))
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yield return m;
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}
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else
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yield return mod;
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}
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/// <summary>
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/// Verifies all proposed mods are valid for a given ruleset and returns instantiated <see cref="Mod"/>s for further processing.
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/// </summary>
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/// <param name="ruleset">The ruleset to verify mods against.</param>
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/// <param name="proposedMods">The proposed mods.</param>
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/// <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>
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public static bool InstantiateValidModsForRuleset(Ruleset ruleset, IEnumerable<APIMod> proposedMods, out List<Mod> valid)
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{
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valid = new List<Mod>();
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bool proposedWereValid = true;
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foreach (var apiMod in proposedMods)
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{
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var mod = apiMod.ToMod(ruleset);
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if (mod is UnknownMod)
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{
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proposedWereValid = false;
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continue;
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}
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valid.Add(mod);
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}
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return proposedWereValid;
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}
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}
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}
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