bbradson
86 lines
3.1 KiB
C#
86 lines
3.1 KiB
C#
// Copyright (c) 2022 bradson
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at https://mozilla.org/MPL/2.0/.
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namespace FisheryLib.FunctionPointers;
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public static class Convert<TFrom> where TFrom : IConvertible
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{
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public static class To<TTo>
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{
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public static readonly unsafe delegate*<TFrom, IFormatProvider, TTo> Default = Convert.GetDefaultConverter<TFrom, TTo>();
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}
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/// <summary>
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/// Used when TFrom isn't a known sealed type, i.e. with just the IConvertible interface
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/// </summary>
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internal static class Fallback<TTo>
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{
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internal static readonly Func<TFrom, IFormatProvider, TTo> Func = Convert.GetDefaultConverterFunc<TFrom, TTo>();
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internal static TTo FallbackMethod(TFrom from, IFormatProvider provider) => Func(from, provider);
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}
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}
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internal static class Convert
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{
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private static MethodInfo GetConverterMethod<TFrom>(Type to) where TFrom : IConvertible
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{
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var info = typeof(TFrom).GetMethod(GetConvertMethodName(to));
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if (info.GetParameters().Length > 1)
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{
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info = typeof(Convert)
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.GetMethod(nameof(ConvertToType), AccessTools.allDeclared)
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.MakeGenericMethod(new[] { typeof(TFrom), to });
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}
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return info;
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}
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internal static Func<TFrom, IFormatProvider, TTo> GetDefaultConverterFunc<TFrom, TTo>() where TFrom : IConvertible
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=> (Func<TFrom, IFormatProvider, TTo>)GetConverterMethod<TFrom>(typeof(TTo))
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.CreateDelegate(typeof(Func<TFrom, IFormatProvider, TTo>));
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internal static unsafe delegate*<TFrom, IFormatProvider, TTo> GetDefaultConverter<TFrom, TTo>() where TFrom : IConvertible
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=> !typeof(TFrom).IsValueType && (!typeof(TFrom).IsSealed || typeof(TFrom).IsInterface || typeof(TFrom).IsAbstract)
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? &Convert<TFrom>.Fallback<TTo>.FallbackMethod
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: (delegate*<TFrom, IFormatProvider, TTo>)GetConverterMethod<TFrom>(typeof(TTo))
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.MethodHandle.GetFunctionPointer();
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private static TTo ConvertToType<TFrom, TTo>(TFrom from, IFormatProvider provider) where TFrom : IConvertible
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=> (TTo)from.ToType(typeof(TTo), provider);
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private static string GetConvertMethodName(Type type)
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=> type == typeof(bool)
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? nameof(IConvertible.ToBoolean)
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: type == typeof(char)
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? nameof(IConvertible.ToChar)
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: type == typeof(sbyte)
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? nameof(IConvertible.ToSByte)
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: type == typeof(byte)
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? nameof(IConvertible.ToByte)
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: type == typeof(short)
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? nameof(IConvertible.ToInt16)
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: type == typeof(ushort)
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? nameof(IConvertible.ToUInt16)
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: type == typeof(int)
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? nameof(IConvertible.ToInt32)
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: type == typeof(uint)
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? nameof(IConvertible.ToUInt32)
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: type == typeof(long)
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? nameof(IConvertible.ToInt64)
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: type == typeof(ulong)
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? nameof(IConvertible.ToUInt64)
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: type == typeof(float)
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? nameof(IConvertible.ToSingle)
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: type == typeof(double)
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? nameof(IConvertible.ToDouble)
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: type == typeof(decimal)
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? nameof(IConvertible.ToDecimal)
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: type == typeof(DateTime)
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? nameof(IConvertible.ToDateTime)
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: type == typeof(string)
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? nameof(IConvertible.ToString)
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//: type == typeof(object)
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//? value
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: nameof(IConvertible.ToType);
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} |