itchyOwl
84 lines
3.6 KiB
C#
84 lines
3.6 KiB
C#
#nullable enable
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using System;
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using System.Collections.Generic;
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using System.Collections.Immutable;
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using System.Linq;
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using System.Reflection;
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namespace Barotrauma
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{
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public static class ReflectionUtils
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{
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private static readonly Dictionary<Assembly, ImmutableArray<Type>> cachedNonAbstractTypes
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= new Dictionary<Assembly, ImmutableArray<Type>>();
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private static readonly Dictionary<Assembly, Dictionary<Type, ImmutableArray<Type>>> cachedDerivedNonAbstract
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= new Dictionary<Assembly, Dictionary<Type, ImmutableArray<Type>>>();
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public static IEnumerable<Type> GetDerivedNonAbstract<T>()
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{
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Type t = typeof(T);
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Assembly assembly = typeof(T).Assembly;
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if (!cachedNonAbstractTypes.ContainsKey(assembly))
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{
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cachedNonAbstractTypes[assembly] = assembly.GetTypes()
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.Where(t => !t.IsAbstract).ToImmutableArray();
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cachedDerivedNonAbstract[assembly] = new Dictionary<Type, ImmutableArray<Type>>();
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}
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if (cachedDerivedNonAbstract[assembly].TryGetValue(t, out var cachedArray))
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{
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return cachedArray;
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}
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var newArray = cachedNonAbstractTypes[assembly].Where(t2 => t2.IsSubclassOf(t)).ToImmutableArray();
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cachedDerivedNonAbstract[assembly].Add(t, newArray);
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return newArray;
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}
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public static Option<TBase> ParseDerived<TBase, TInput>(TInput input) where TInput : notnull where TBase : notnull
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{
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static Option<TBase> none() => Option<TBase>.None();
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var derivedTypes = GetDerivedNonAbstract<TBase>();
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Option<TBase> parseOfType(Type t)
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{
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//every TBase type is expected to have a method with the following signature:
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// public static Option<T> Parse(TInput str)
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var parseFunc = t.GetMethod("Parse", BindingFlags.Public | BindingFlags.Static);
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if (parseFunc is null) { return none(); }
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var parameters = parseFunc.GetParameters();
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if (parameters.Length != 1) { return none(); }
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var returnType = parseFunc.ReturnType;
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if (!returnType.IsConstructedGenericType) { return none(); }
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if (returnType.GetGenericTypeDefinition() != typeof(Option<>)) { return none(); }
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if (returnType.GenericTypeArguments[0] != t) { return none(); }
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//some hacky business to convert from Option<T2> to Option<TBase> when we only know T2 at runtime
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static Option<TBase> convert<T2>(Option<T2> option) where T2 : TBase
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=> option.Select(v => (TBase)v);
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Func<Option<TBase>, Option<TBase>> f = convert;
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var genericArgs = f.Method.GetGenericArguments();
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genericArgs[^1] = t;
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var constructedConverter =
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f.Method.GetGenericMethodDefinition().MakeGenericMethod(genericArgs);
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return constructedConverter.Invoke(null, new[] { parseFunc.Invoke(null, new object[] { input }) })
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as Option<TBase>? ?? none();
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}
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return derivedTypes.Select(parseOfType).FirstOrDefault(t => t.IsSome());
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}
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public static string NameWithGenerics(this Type t)
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{
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if (!t.IsGenericType) { return t.Name; }
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string result = t.Name[..t.Name.IndexOf('`')];
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result += $"<{string.Join(", ", t.GetGenericArguments().Select(NameWithGenerics))}>";
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return result;
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}
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}
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} |