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154 lines
6.5 KiB
154 lines
6.5 KiB
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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using IPA.Config;
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using IPA.Logging;
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using IPA.Utilities;
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using System.Linq.Expressions;
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#if NET3
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using Net3_Proxy;
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#endif
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namespace IPA.Loader
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{
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/// <summary>
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/// The type that handles value injecting into a plugin's Init.
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/// </summary>
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public static class PluginInitInjector
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{
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/// <summary>
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/// A typed injector for a plugin's Init method. When registered, called for all associated types. If it returns null, the default for the type will be used.
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/// </summary>
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/// <param name="previous">the previous return value of the function, or <see langword="null"/> if never called for plugin.</param>
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/// <param name="param">the <see cref="ParameterInfo"/> of the parameter being injected.</param>
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/// <param name="meta">the <see cref="PluginMetadata"/> for the plugin being loaded.</param>
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/// <returns>the value to inject into that parameter.</returns>
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public delegate object InjectParameter(object previous, ParameterInfo param, PluginMetadata meta);
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/// <summary>
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/// Adds an injector to be used when calling future plugins' Init methods.
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/// </summary>
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/// <param name="type">the type of the parameter.</param>
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/// <param name="injector">the function to call for injection.</param>
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public static void AddInjector(Type type, InjectParameter injector)
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{
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injectors.Add(new TypedInjector(type, injector));
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}
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private struct TypedInjector : IEquatable<TypedInjector>
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{
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public Type Type;
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public InjectParameter Injector;
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public TypedInjector(Type t, InjectParameter i)
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{ Type = t; Injector = i; }
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public object Inject(object prev, ParameterInfo info, PluginMetadata meta)
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=> Injector(prev, info, meta);
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public bool Equals(TypedInjector other)
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=> Type == other.Type && Injector == other.Injector;
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public override bool Equals(object obj)
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=> obj is TypedInjector i && Equals(i);
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public override int GetHashCode()
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=> Type.GetHashCode() ^ Injector.GetHashCode();
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public static bool operator ==(TypedInjector a, TypedInjector b) => a.Equals(b);
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public static bool operator !=(TypedInjector a, TypedInjector b) => !a.Equals(b);
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}
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private static readonly List<TypedInjector> injectors = new List<TypedInjector>
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{
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new TypedInjector(typeof(Logger), (prev, param, meta) => prev ?? new StandardLogger(meta.Name)),
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new TypedInjector(typeof(PluginMetadata), (prev, param, meta) => prev ?? meta),
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new TypedInjector(typeof(Config.Config), (prev, param, meta) =>
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{
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if (prev != null) return prev;
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return Config.Config.GetConfigFor(meta.Name, param);
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})
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};
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private static int? MatchPriority(Type target, Type source)
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{
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if (target == source) return int.MaxValue;
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if (!target.IsAssignableFrom(source)) return null;
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if (!target.IsInterface && !source.IsSubclassOf(target)) return int.MinValue;
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int value = 0;
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while (true)
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{
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if (source == null) return value;
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if (target.IsInterface && source.GetInterfaces().Contains(target))
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return value;
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else if (target == source)
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return value;
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else
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{
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value--; // lower priority
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source = source.BaseType;
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}
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}
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}
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private static readonly MethodInfo InjectMethod = typeof(PluginInitInjector).GetMethod(nameof(Inject), BindingFlags.NonPublic | BindingFlags.Static);
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internal static Expression InjectedCallExpr(ParameterInfo[] initParams, Expression meta, Func<IEnumerable<Expression>, Expression> exprGen)
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{
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var arr = Expression.Variable(typeof(object[]));
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return Expression.Block(
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Expression.Assign(arr, Expression.Call(InjectMethod, Expression.Constant(initParams), meta)),
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exprGen(initParams
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.Select(p => p.ParameterType)
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.Select((t, i) => Expression.Convert(
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Expression.ArrayIndex(arr, Expression.Constant(i)), t))));
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}
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internal static object[] Inject(ParameterInfo[] initParams, PluginMetadata meta)
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{
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var initArgs = new List<object>();
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var previousValues = new Dictionary<TypedInjector, object>(injectors.Count);
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foreach (var param in initParams)
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{
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var paramType = param.ParameterType;
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var value = paramType.GetDefault();
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var toUse = injectors.Select(i => (inject: i, priority: MatchPriority(paramType, i.Type))) // check match priority, combine it
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.Where(t => t.priority != null) // filter null priorities
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.Select(t => (t.inject, priority: t.priority.Value)) // remove nullable
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.OrderByDescending(t => t.priority) // sort by value
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.Select(t => t.inject); // remove priority value
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// this tries injectors in order of closest match by type provided
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foreach (var pair in toUse)
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{
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object prev = null;
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if (previousValues.ContainsKey(pair))
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prev = previousValues[pair];
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var val = pair.Inject(prev, param, meta);
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if (previousValues.ContainsKey(pair))
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previousValues[pair] = val;
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else
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previousValues.Add(pair, val);
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if (val == null) continue;
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value = val;
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break;
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}
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initArgs.Add(value);
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}
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//init.Invoke(instance, initArgs.ToArray());
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return initArgs.ToArray();
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}
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}
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}
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