346 lines
13 KiB
C#
346 lines
13 KiB
C#
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#region License
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// Copyright (c) 2007 James Newton-King
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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#endregion
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using System;
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using System.Collections.Generic;
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#if !HAVE_LINQ
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using LC.Newtonsoft.Json.Utilities.LinqBridge;
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#else
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using System.Linq;
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#endif
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using System.Reflection;
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namespace LC.Newtonsoft.Json.Utilities
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{
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#if PORTABLE
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internal static class MethodBinder
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{
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/// <summary>
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/// List of primitive types which can be widened.
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/// </summary>
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private static readonly Type[] PrimitiveTypes = new Type[]
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{
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typeof(bool), typeof(char), typeof(sbyte), typeof(byte),
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typeof(short), typeof(ushort), typeof(int), typeof(uint),
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typeof(long), typeof(ulong), typeof(float), typeof(double)
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};
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/// <summary>
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/// Widening masks for primitive types above.
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/// Index of the value in this array defines a type we're widening,
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/// while the bits in mask define types it can be widened to (including itself).
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///
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/// For example, value at index 0 defines a bool type, and it only has bit 0 set,
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/// i.e. bool values can be assigned only to bool.
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/// </summary>
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private static readonly int[] WideningMasks = new int[]
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{
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0x0001, 0x0FE2, 0x0D54, 0x0FFA,
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0x0D50, 0x0FE2, 0x0D40, 0x0F80,
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0x0D00, 0x0E00, 0x0C00, 0x0800
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};
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/// <summary>
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/// Checks if value of primitive type <paramref name="from"/> can be
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/// assigned to parameter of primitive type <paramref name="to"/>.
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/// </summary>
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/// <param name="from">Source primitive type.</param>
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/// <param name="to">Target primitive type.</param>
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/// <returns><c>true</c> if source type can be widened to target type, <c>false</c> otherwise.</returns>
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private static bool CanConvertPrimitive(Type from, Type to)
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{
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if (from == to)
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{
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// same type
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return true;
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}
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int fromMask = 0;
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int toMask = 0;
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for (int i = 0; i < PrimitiveTypes.Length; i++)
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{
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if (PrimitiveTypes[i] == from)
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{
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fromMask = WideningMasks[i];
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}
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else if (PrimitiveTypes[i] == to)
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{
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toMask = 1 << i;
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}
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if (fromMask != 0 && toMask != 0)
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{
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break;
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}
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}
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return (fromMask & toMask) != 0;
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}
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/// <summary>
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/// Checks if a set of values with given <paramref name="types"/> can be used
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/// to invoke a method with specified <paramref name="parameters"/>.
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/// </summary>
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/// <param name="parameters">Method parameters.</param>
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/// <param name="types">Argument types.</param>
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/// <param name="enableParamArray">Try to pack extra arguments into the last parameter when it is marked up with <see cref="ParamArrayAttribute"/>.</param>
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/// <returns><c>true</c> if method can be called with given arguments, <c>false</c> otherwise.</returns>
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private static bool FilterParameters(ParameterInfo[] parameters, IList<Type> types, bool enableParamArray)
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{
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ValidationUtils.ArgumentNotNull(parameters, nameof(parameters));
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ValidationUtils.ArgumentNotNull(types, nameof(types));
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if (parameters.Length == 0)
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{
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// fast check for parameterless methods
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return types.Count == 0;
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}
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if (parameters.Length > types.Count)
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{
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// not all declared parameters were specified (optional parameters are not supported)
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return false;
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}
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// check if the last parameter is ParamArray
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Type? paramArrayType = null;
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if (enableParamArray)
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{
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ParameterInfo lastParam = parameters[parameters.Length - 1];
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if (lastParam.ParameterType.IsArray && lastParam.IsDefined(typeof(ParamArrayAttribute)))
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{
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paramArrayType = lastParam.ParameterType.GetElementType();
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}
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}
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if (paramArrayType == null && parameters.Length != types.Count)
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{
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// when there's no ParamArray, number of parameters should match
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return false;
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}
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for (int i = 0; i < types.Count; i++)
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{
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Type paramType = (paramArrayType != null && i >= parameters.Length - 1) ? paramArrayType : parameters[i].ParameterType;
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if (paramType == types[i])
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{
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// exact match with provided type
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continue;
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}
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if (paramType == typeof(object))
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{
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// parameter of type object matches anything
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continue;
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}
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if (paramType.IsPrimitive())
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{
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if (!types[i].IsPrimitive() || !CanConvertPrimitive(types[i], paramType))
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{
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// primitive parameter can only be assigned from compatible primitive type
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return false;
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}
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}
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else
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{
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if (!paramType.IsAssignableFrom(types[i]))
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{
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return false;
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}
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}
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}
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return true;
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}
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/// <summary>
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/// Compares two sets of parameters to determine
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/// which one suits better for given argument types.
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/// </summary>
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private class ParametersMatchComparer : IComparer<ParameterInfo[]>
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{
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private readonly IList<Type> _types;
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private readonly bool _enableParamArray;
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public ParametersMatchComparer(IList<Type> types, bool enableParamArray)
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{
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ValidationUtils.ArgumentNotNull(types, nameof(types));
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_types = types;
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_enableParamArray = enableParamArray;
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}
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public int Compare(ParameterInfo[] parameters1, ParameterInfo[] parameters2)
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{
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ValidationUtils.ArgumentNotNull(parameters1, nameof(parameters1));
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ValidationUtils.ArgumentNotNull(parameters2, nameof(parameters2));
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// parameterless method wins
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if (parameters1.Length == 0)
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{
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return -1;
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}
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if (parameters2.Length == 0)
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{
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return 1;
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}
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Type? paramArrayType1 = null, paramArrayType2 = null;
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if (_enableParamArray)
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{
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ParameterInfo lastParam1 = parameters1[parameters1.Length - 1];
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if (lastParam1.ParameterType.IsArray && lastParam1.IsDefined(typeof(ParamArrayAttribute)))
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{
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paramArrayType1 = lastParam1.ParameterType.GetElementType();
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}
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ParameterInfo lastParam2 = parameters2[parameters2.Length - 1];
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if (lastParam2.ParameterType.IsArray && lastParam2.IsDefined(typeof(ParamArrayAttribute)))
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{
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paramArrayType2 = lastParam2.ParameterType.GetElementType();
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}
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// A method using params always loses to one not using params
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if (paramArrayType1 != null && paramArrayType2 == null)
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{
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return 1;
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}
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if (paramArrayType2 != null && paramArrayType1 == null)
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{
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return -1;
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}
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}
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for (int i = 0; i < _types.Count; i++)
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{
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Type type1 = (paramArrayType1 != null && i >= parameters1.Length - 1) ? paramArrayType1 : parameters1[i].ParameterType;
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Type type2 = (paramArrayType2 != null && i >= parameters2.Length - 1) ? paramArrayType2 : parameters2[i].ParameterType;
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if (type1 == type2)
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{
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// exact match between parameter types doesn't change score
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continue;
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}
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// exact match with source type decides winner immediately
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if (type1 == _types[i])
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{
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return -1;
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}
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if (type2 == _types[i])
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{
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return 1;
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}
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int r = ChooseMorePreciseType(type1, type2);
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if (r != 0)
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{
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// winner decided
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return r;
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}
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}
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return 0;
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}
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private static int ChooseMorePreciseType(Type type1, Type type2)
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{
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if (type1.IsByRef || type2.IsByRef)
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{
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if (type1.IsByRef && type2.IsByRef)
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{
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type1 = type1.GetElementType();
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type2 = type2.GetElementType();
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}
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else if (type1.IsByRef)
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{
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type1 = type1.GetElementType();
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if (type1 == type2)
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{
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return 1;
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}
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}
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else
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{
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type2 = type2.GetElementType();
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if (type2 == type1)
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{
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return -1;
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}
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}
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}
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bool c1FromC2, c2FromC1;
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if (type1.IsPrimitive() && type2.IsPrimitive())
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{
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c1FromC2 = CanConvertPrimitive(type2, type1);
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c2FromC1 = CanConvertPrimitive(type1, type2);
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}
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else
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{
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c1FromC2 = type1.IsAssignableFrom(type2);
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c2FromC1 = type2.IsAssignableFrom(type1);
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}
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if (c1FromC2 == c2FromC1)
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{
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return 0;
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}
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return c1FromC2 ? 1 : -1;
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}
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}
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/// <summary>
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/// Returns a best method overload for given argument <paramref name="types"/>.
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/// </summary>
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/// <param name="candidates">List of method candidates.</param>
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/// <param name="types">Argument types.</param>
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/// <returns>Best method overload, or <c>null</c> if none matched.</returns>
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public static TMethod SelectMethod<TMethod>(IEnumerable<TMethod> candidates, IList<Type> types) where TMethod : MethodBase
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{
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ValidationUtils.ArgumentNotNull(candidates, nameof(candidates));
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ValidationUtils.ArgumentNotNull(types, nameof(types));
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// ParamArrays are not supported by ReflectionDelegateFactory
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// They will be treated like ordinary array arguments
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const bool enableParamArray = false;
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return candidates
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.Where(m => FilterParameters(m.GetParameters(), types, enableParamArray))
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.OrderBy(m => m.GetParameters(), new ParametersMatchComparer(types, enableParamArray))
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.FirstOrDefault();
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}
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}
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#endif
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}
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