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//-----------------------------------------------------------------------
// <copyright file="MethodInfoExtensions.cs" company="Sirenix IVS">
// Copyright (c) 2018 Sirenix IVS
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// </copyright>
//-----------------------------------------------------------------------
namespace VRC.Udon.Serialization.OdinSerializer.Utilities
{
using System;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Text;
/// <summary>
/// Various extensions for MethodInfo.
/// </summary>
public static class MethodInfoExtensions
{
/// <summary>
/// Returns the specified method's full name "methodName(argType1 arg1, argType2 arg2, etc)"
/// Uses the specified gauntlet to replaces type names, ex: "int" instead of "Int32"
/// </summary>
public static string GetFullName(this MethodBase method, string extensionMethodPrefix)
{
var builder = new StringBuilder();
bool isExtensionMethod = method.IsExtensionMethod();
if (isExtensionMethod)
{
builder.Append(extensionMethodPrefix);
}
builder.Append(method.Name);
builder.Append("(");
builder.Append(method.GetParamsNames());
builder.Append(")");
return builder.ToString();
}
/// <summary>
/// Returns a string representing the passed method parameters names. Ex "int num, float damage, Transform target"
/// </summary>
public static string GetParamsNames(this MethodBase method)
{
ParameterInfo[] pinfos = method.IsExtensionMethod() ? method.GetParameters().Skip(1).ToArray() : method.GetParameters();
var builder = new StringBuilder();
for (int i = 0, len = pinfos.Length; i < len; i++)
{
var param = pinfos[i];
var paramTypeName = param.ParameterType.GetNiceName();
builder.Append(paramTypeName);
builder.Append(" ");
builder.Append(param.Name);
if (i < len - 1)
{
builder.Append(", ");
}
}
return builder.ToString();
}
/// <summary>
/// Returns the specified method's full name.
/// </summary>
public static string GetFullName(this MethodBase method)
{
return GetFullName(method, "[ext] ");
}
/// <summary>
/// Tests if a method is an extension method.
/// </summary>
public static bool IsExtensionMethod(this MethodBase method)
{
var type = method.DeclaringType;
return type.IsSealed &&
!type.IsGenericType &&
!type.IsNested &&
method.IsDefined(typeof(ExtensionAttribute), false);
}
/// <summary>
/// Determines whether the specified method is an alias.
/// </summary>
/// <param name="methodInfo">The method to check.</param>
/// <returns>
/// <c>true</c> if the specified method is an alias; otherwise, <c>false</c>.
/// </returns>
public static bool IsAliasMethod(this MethodInfo methodInfo)
{
return methodInfo is MemberAliasMethodInfo;
}
/// <summary>
/// Returns the original, backing method of an alias method if the method is an alias.
/// </summary>
/// <param name="methodInfo">The method to check.</param>
/// /// <param name="throwOnNotAliased">if set to <c>true</c> an exception will be thrown if the method is not aliased.</param>
/// <returns></returns>
/// <exception cref="System.ArgumentException">The method was not aliased; this only occurs if throwOnNotAliased is true.</exception>
public static MethodInfo DeAliasMethod(this MethodInfo methodInfo, bool throwOnNotAliased = false)
{
MemberAliasMethodInfo aliasMethodInfo = methodInfo as MemberAliasMethodInfo;
if (aliasMethodInfo != null)
{
while (aliasMethodInfo.AliasedMethod is MemberAliasMethodInfo)
{
aliasMethodInfo = aliasMethodInfo.AliasedMethod as MemberAliasMethodInfo;
}
return aliasMethodInfo.AliasedMethod;
}
if (throwOnNotAliased)
{
throw new ArgumentException("The method " + methodInfo.GetNiceName() + " was not aliased.");
}
return methodInfo;
}
}
}
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