avoid patching indexers instead

MiraAPI.Example/.editorconfig

@@ -2,3 +2,6 @@
 
 # SA1602: Enumeration items should be documented.
 dotnet_diagnostic.SA1602.severity = none
+
+# SA1601: Partial elements should be documented
+dotnet_diagnostic.SA1601.severity = none

MiraAPI.Example/ExampleEventHandlers.cs

@@ -1,5 +1,4 @@
-using System.Diagnostics.CodeAnalysis;
-using System.Globalization;
+using System.Globalization;
 using System.Linq;
 using MiraAPI.Events;
 using MiraAPI.Events.Mira;

MiraAPI.Example/Options/ExampleOptions.cs

@@ -42,8 +42,7 @@ public class ExampleOptions : AbstractOptionGroup
     public Api WorstApi { get; set; } = Api.MiraAPI;
 
     [ModdedEnumOptionList<ValueState>("Value State {0}", ["None", "Primary", "Secondary"])]
-    public ModdedList<ValueState> ValueStates { get; set; } =
-        [ValueState.Primary, ValueState.Secondary, ValueState.None, ValueState.None, ValueState.None];
+    public ModdedArray<ValueState> ValueStates { get; set; } = [ValueState.Primary, ValueState.Secondary, ValueState.None, ValueState.None, ValueState.None];
 
     [ModdedPlayerOption("options.exampleOptions1.players")]
     public NetworkedPlayerInfo PlayerSelected { get; set; }

MiraAPI/GameOptions/CollectionBuilder.cs

@@ -0,0 +1,8 @@
+namespace System.Runtime.CompilerServices;
+
+[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Interface, Inherited = false)]
+internal sealed class CollectionBuilderAttribute(Type builderType, string methodName) : Attribute
+{
+    public Type BuilderType { get; } = builderType;
+    public string MethodName { get; } = methodName;
+}

MiraAPI/GameOptions/ModdedList.cs

@@ -1,9 +1,294 @@
+using System;
+using System.Collections;
 using System.Collections.Generic;
+using System.Runtime.CompilerServices;
 
 namespace MiraAPI.GameOptions;
 
 /// <summary>
-/// A simple list that extends <see cref="List{T}"/>.
+/// A fixed-size array created specifically for modded options that automatically synchronizes with option attributes.
 /// </summary>
-/// <typeparam name="T">The type of the values that the list holds.</typeparam>
-public sealed class ModdedList<T> : List<T>;
+/// <typeparam name="T">The type of the values that the array holds.</typeparam>
+[CollectionBuilder(typeof(ModdedArrayBuilder), nameof(ModdedArrayBuilder.Create))]
+public sealed class ModdedArray<T> : IList<T>, IReadOnlyList<T>, IList
+{
+    private readonly T[] items;
+    private int version;
+
+    /// <inheritdoc/>
+    public int Count => items.Length;
+
+    /// <inheritdoc/>
+    public bool IsReadOnly => false;
+
+    /// <inheritdoc/>
+    bool IList.IsFixedSize => true;
+
+    /// <inheritdoc/>
+    bool ICollection.IsSynchronized => false;
+
+    /// <inheritdoc/>
+    object ICollection.SyncRoot => items.SyncRoot;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ModdedArray{T}"/> class with the provided capacity.
+    /// </summary>
+    /// <param name="capacity">The capacity of the list.</param>
+    public ModdedArray(int capacity)
+    {
+        items = new T[capacity];
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ModdedArray{T}"/> class with initial values.
+    /// </summary>
+    /// <param name="collection">The initial collection of values to initialise with.</param>
+    public ModdedArray(IEnumerable<T> collection)
+    {
+        items = [.. collection];
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ModdedArray{T}"/> class with initial values.
+    /// </summary>
+    /// <param name="span">The initial span of values to initialise with.</param>
+    public ModdedArray(Span<T> span)
+    {
+        items = [.. span];
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ModdedArray{T}"/> class with initial values.
+    /// </summary>
+    /// <param name="span">The initial span of values to initialise with.</param>
+    public ModdedArray(ReadOnlySpan<T> span)
+    {
+        items = [.. span];
+    }
+
+    /// <summary>
+    /// Gets or sets the element at the specified index, syncing with the attribute if registered.
+    /// </summary>
+    /// <param name="index">The index of the value.</param>
+    public T this[int index]
+    {
+        get => ModdedOptionsManager.ListInstanceCache.TryGetValue(this, out var attribute)
+            ? (T)attribute.GetValue(index)
+            : items[index];
+        set
+        {
+            if (ModdedOptionsManager.ListInstanceCache.TryGetValue(this, out var attribute))
+                attribute.SetValue(index, value!);
+            else
+                items[index] = value;
+
+            version++;
+        }
+    }
+
+    /// <inheritdoc/>
+    object? IList.this[int index]
+    {
+        get => this[index];
+        set => this[index] = (T)value!;
+    }
+
+    /// <inheritdoc/>
+    public bool Contains(T item)
+    {
+        return Array.IndexOf(items, item) >= 0;
+    }
+
+    /// <inheritdoc/>
+    public void CopyTo(T[] array, int arrayIndex)
+    {
+        items.CopyTo(array, arrayIndex);
+    }
+
+    /// <inheritdoc/>
+    public int IndexOf(T item)
+    {
+        return Array.IndexOf(items, item);
+    }
+
+    /// <inheritdoc cref="IEnumerable{T}.GetEnumerator"/>
+    public Enumerator GetEnumerator()
+    {
+        return new(this);
+    }
+
+    /// <inheritdoc/>
+    bool IList.Contains(object? value)
+    {
+        return ((IList)items).Contains(value);
+    }
+
+    /// <inheritdoc/>
+    int IList.IndexOf(object? value)
+    {
+        return ((IList)items).IndexOf(value);
+    }
+
+    /// <inheritdoc/>
+    void ICollection.CopyTo(Array array, int index)
+    {
+        items.CopyTo(array, index);
+    }
+
+    /// <inheritdoc/>
+    IEnumerator<T> IEnumerable<T>.GetEnumerator()
+    {
+        return GetEnumerator();
+    }
+
+    /// <inheritdoc/>
+    IEnumerator IEnumerable.GetEnumerator()
+    {
+        return GetEnumerator();
+    }
+
+    /// <inheritdoc/>
+    int IList.Add(object? value)
+    {
+        throw new NotSupportedException("ModdedArray is of a fixed size.");
+    }
+
+    /// <inheritdoc/>
+    void IList.Clear()
+    {
+        throw new NotSupportedException("ModdedArray is of a fixed size.");
+    }
+
+    /// <inheritdoc/>
+    void IList.Insert(int index, object? value)
+    {
+        throw new NotSupportedException("ModdedArray is of a fixed size.");
+    }
+
+    /// <inheritdoc/>
+    void IList.Remove(object? value)
+    {
+        throw new NotSupportedException("ModdedArray is of a fixed size.");
+    }
+
+    /// <inheritdoc/>
+    void IList.RemoveAt(int index)
+    {
+        throw new NotSupportedException("ModdedArray is of a fixed size.");
+    }
+
+    /// <inheritdoc/>
+    public void Insert(int index, T item)
+    {
+        throw new NotSupportedException("ModdedArray is of a fixed size.");
+    }
+
+    /// <inheritdoc/>
+    public void RemoveAt(int index)
+    {
+        throw new NotSupportedException("ModdedArray is of a fixed size.");
+    }
+
+    /// <inheritdoc/>
+    public void Add(T item)
+    {
+        throw new NotSupportedException("ModdedArray is of a fixed size.");
+    }
+
+    /// <inheritdoc/>
+    public void Clear()
+    {
+        throw new NotSupportedException("ModdedArray is of a fixed size.");
+    }
+
+    /// <inheritdoc/>
+    public bool Remove(T item)
+    {
+        throw new NotSupportedException("ModdedArray is of a fixed size.");
+    }
+
+    /// <summary>
+    /// Enumerates the elements of a <see cref="ModdedArray{T}"/>.
+    /// </summary>
+    public struct Enumerator : IEnumerator<T>
+    {
+        private readonly ModdedArray<T> array;
+        private readonly int version;
+
+        private int index;
+        private T? current;
+
+        internal Enumerator(ModdedArray<T> moddedArray)
+        {
+            array = moddedArray;
+            version = moddedArray.version;
+            index = 0;
+            current = default;
+        }
+
+        /// <inheritdoc/>
+        public readonly T Current => current!;
+
+        /// <inheritdoc/>
+        readonly object? IEnumerator.Current
+        {
+            get
+            {
+                if (index == 0 || index == array.Count + 1)
+                    throw new InvalidOperationException("Enumeration has not started or has already finished.");
+
+                return Current;
+            }
+        }
+
+        /// <inheritdoc/>
+        public readonly void Dispose()
+        {
+        }
+
+        /// <inheritdoc/>
+        public bool MoveNext()
+        {
+            if (version != array.version)
+                throw new InvalidOperationException("Collection was modified; enumeration operation may not execute.");
+
+            if ((uint)index < (uint)array.Count)
+            {
+                current = array[index];
+                index++;
+                return true;
+            }
+
+            index = array.Count + 1;
+            current = default;
+            return false;
+        }
+
+        /// <inheritdoc/>
+        public void Reset()
+        {
+            if (version != array.version)
+                throw new InvalidOperationException("Collection was modified; enumeration operation may not execute.");
+
+            index = 0;
+            current = default;
+        }
+    }
+}
+
+/// <summary>
+/// Provides a builder for <see cref="ModdedArray{T}"/> to support C# 12 collection expressions.
+/// </summary>
+public static class ModdedArrayBuilder
+{
+    /// <summary>
+    /// Creates a new <see cref="ModdedArray{T}"/> from a span of values.
+    /// </summary>
+    /// <typeparam name="T">The the type of the values.</typeparam>
+    /// <param name="values">The values to initialise with.</param>
+    /// <returns>The <see cref="ModdedArray{T}"/> instance initialised with the provided values.</returns>
+    public static ModdedArray<T> Create<T>(ReadOnlySpan<T> values)
+    {
+        return new(values);
+    }
+}

MiraAPI/GameOptions/ModdedOptionsManager.cs

@@ -25,18 +25,15 @@ namespace MiraAPI.GameOptions;
 /// </summary>
 public static class ModdedOptionsManager
 {
-    private static readonly ConditionalWeakTable<object, ModdedOptionListAttribute> ListInstanceCache = [];
     private static readonly Dictionary<MethodBase, PropertyOptionAttribute> GetterLookups = [];
     private static readonly Dictionary<MethodBase, PropertyOptionAttribute> SetterLookups = [];
     private static readonly Dictionary<Type, AbstractOptionGroup> TypeToGroup = [];
     private static readonly HashSet<PropertyInfo> OptionAttributes = [];
-    private static readonly HashSet<Type> PatchedListTypes = [];
 
     private static readonly HarmonyMethod CachedGetterPatch = new(typeof(ModdedOptionsManager), nameof(PropertyGetterPatch));
     private static readonly HarmonyMethod CachedSetterPatch = new(typeof(ModdedOptionsManager), nameof(PropertySetterPatch));
-    private static readonly HarmonyMethod CachedListGetterPatch = new(typeof(ModdedOptionsManager), nameof(PropertyListGetterPatch));
-    private static readonly HarmonyMethod CachedListSetterPatch = new(typeof(ModdedOptionsManager), nameof(PropertyListSetterPatch));
 
+    internal static readonly ConditionalWeakTable<object, ModdedOptionListAttribute> ListInstanceCache = [];
     internal static readonly Dictionary<OptionBehaviour, ModdedPlayerOption> CreatedPlayerOptions = [];
     internal static readonly Dictionary<OptionBehaviour, ModdedStringOption> CreatedStringOptions = [];
     internal static readonly Dictionary<Type, List<AbstractOptionGroup>> GameModeOptionGroups = [];
@@ -278,7 +275,7 @@ public static class ModdedOptionsManager
         var listType = propertyList.GetType();
         var valueType = listType.GetGenericArguments()[0];
 
-        if (!listType.IsGenericType || listType.GetGenericTypeDefinition() != typeof(ModdedList<>))
+        if (!listType.IsGenericType || listType.GetGenericTypeDefinition() != typeof(ModdedArray<>))
         {
             Error($"Please use ModdedList<{valueType.Name}> for modded option lists.");
             return;
@@ -296,19 +293,6 @@ public static class ModdedOptionsManager
             SetterLookups[setterOriginal] = attribute;
         }
 
-        if (PatchedListTypes.Add(listType))
-        {
-            var listIndex = listType.GetProperty("Item")!;
-
-            var listGetterOriginal = listIndex.GetGetMethod(true);
-            PluginSingleton<MiraApiPlugin>.Instance.Harmony.Patch(listGetterOriginal, prefix: CachedListGetterPatch);
-
-            var listSetterOriginal = listIndex.GetSetMethod(true);
-
-            if (listSetterOriginal != null)
-                PluginSingleton<MiraApiPlugin>.Instance.Harmony.Patch(listSetterOriginal, postfix: CachedListSetterPatch);
-        }
-
         attribute.HolderOptionList = optionList;
         attribute.Value = propertyList;
         attribute.ValueType = valueType;
@@ -453,36 +437,4 @@ public static class ModdedOptionsManager
         __result = attribute.GetValue();
         return false;
     }
-
-    /// <summary>
-    /// Patches the setter of a list property to update the value of the option.
-    /// </summary>
-    /// <param name="__instance">The list's instance.</param>
-    /// <param name="index">The index to find in the list.</param>
-    /// <param name="value">The new object value.</param>
-    [SuppressMessage("ReSharper", "InconsistentNaming", Justification = "Harmony naming convention")]
-    [SuppressMessage("Naming", "CA1707:Identifiers should not contain underscores", Justification = "Read above.")]
-    public static void PropertyListSetterPatch(object __instance, int index, object value)
-    {
-        if (ListInstanceCache.TryGetValue(__instance, out var match))
-            match.SetValue(index, value);
-    }
-
-    /// <summary>
-    /// Patches the getter of a list property to return the value of the option.
-    /// </summary>
-    /// <param name="__instance">The list's instance.</param>
-    /// <param name="index">The index to find in the list.</param>
-    /// <param name="__result">The result of the property getter.</param>
-    /// <returns>False so the original getter gets skipped.</returns>
-    [SuppressMessage("ReSharper", "InconsistentNaming", Justification = "Harmony naming convention")]
-    [SuppressMessage("Naming", "CA1707:Identifiers should not contain underscores", Justification = "Read above.")]
-    public static bool PropertyListGetterPatch(object __instance, int index, ref object __result)
-    {
-        if (!ListInstanceCache.TryGetValue(__instance, out var match))
-            return true;
-
-        __result = match.GetValue(index);
-        return false;
-    }
 }