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using System;
using System.Linq;
using System.Reflection;
using System.Text;
using HarmonyLib;
namespace StardewModdingAPI.Internal.Patching
{
/// <summary>Provides utility methods for patching game code with Harmony.</summary>
internal static class PatchHelper
{
/*********
** Public methods
*********/
/// <summary>Get a constructor and assert that it was found.</summary>
/// <typeparam name="TTarget">The type containing the method.</typeparam>
/// <param name="parameters">The method parameter types, or <c>null</c> if it's not overloaded.</param>
/// <exception cref="InvalidOperationException">The type has no matching constructor.</exception>
public static ConstructorInfo RequireConstructor<TTarget>(Type[]? parameters = null)
{
return
AccessTools.Constructor(typeof(TTarget), parameters)
?? throw new InvalidOperationException($"Can't find constructor {PatchHelper.GetMethodString(typeof(TTarget), null, parameters)} to patch.");
}
/// <summary>Get a method and assert that it was found.</summary>
/// <typeparam name="TTarget">The type containing the method.</typeparam>
/// <param name="name">The method name.</param>
/// <param name="parameters">The method parameter types, or <c>null</c> if it's not overloaded.</param>
/// <param name="generics">The method generic types, or <c>null</c> if it's not generic.</param>
/// <exception cref="InvalidOperationException">The type has no matching method.</exception>
public static MethodInfo RequireMethod<TTarget>(string name, Type[]? parameters = null, Type[]? generics = null)
{
return
AccessTools.Method(typeof(TTarget), name, parameters, generics)
?? throw new InvalidOperationException($"Can't find method {PatchHelper.GetMethodString(typeof(TTarget), name, parameters, generics)} to patch.");
}
/// <summary>Get a human-readable representation of a method target.</summary>
/// <param name="type">The type containing the method.</param>
/// <param name="name">The method name, or <c>null</c> for a constructor.</param>
/// <param name="parameters">The method parameter types, or <c>null</c> if it's not overloaded.</param>
/// <param name="generics">The method generic types, or <c>null</c> if it's not generic.</param>
public static string GetMethodString(Type type, string? name, Type[]? parameters = null, Type[]? generics = null)
{
StringBuilder str = new();
// type
str.Append(type.FullName);
// method name (if not constructor)
if (name != null)
{
str.Append('.');
str.Append(name);
}
// generics
if (generics?.Any() == true)
{
str.Append('<');
str.Append(string.Join(", ", generics.Select(p => p.FullName)));
str.Append('>');
}
// parameters
if (parameters?.Any() == true)
{
str.Append('(');
str.Append(string.Join(", ", parameters.Select(p => p.FullName)));
str.Append(')');
}
return str.ToString();
}
}
}
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