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using System;
using Mono.Cecil;
using Mono.Cecil.Cil;
using StardewModdingAPI.AssemblyRewriters.Framework;
namespace StardewModdingAPI.AssemblyRewriters.Rewriters
{
/// <summary>Rewrites method references from one parent type to another if the signatures match.</summary>
public class GenericMethodMapper : BaseMethodRewriter
{
/*********
** Properties
*********/
/// <summary>The type whose methods to remap.</summary>
private readonly Type FromType;
/// <summary>The type with methods to map to.</summary>
private readonly Type ToType;
/// <summary>Whether to only rewrite references if loading the assembly on a different platform than it was compiled on.</summary>
private readonly bool OnlyIfPlatformChanged;
/*********
** Accessors
*********/
/// <summary>A brief noun phrase indicating what the instruction finder matches.</summary>
public override string NounPhrase { get; }
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="fromType">The type whose methods to remap.</param>
/// <param name="toType">The type with methods to map to.</param>
/// <param name="onlyIfPlatformChanged">Whether to only rewrite references if loading the assembly on a different platform than it was compiled on.</param>
/// <param name="nounPhrase">A brief noun phrase indicating what the instruction finder matches (or <c>null</c> to generate one).</param>
public GenericMethodMapper(Type fromType, Type toType, bool onlyIfPlatformChanged = false, string nounPhrase = null)
{
this.FromType = fromType;
this.ToType = toType;
this.NounPhrase = nounPhrase ?? $"{fromType.Name} methods";
this.OnlyIfPlatformChanged = onlyIfPlatformChanged;
}
/*********
** Protected methods
*********/
/// <summary>Get whether a method reference should be rewritten.</summary>
/// <param name="instruction">The IL instruction.</param>
/// <param name="methodRef">The method reference.</param>
/// <param name="platformChanged">Whether the mod was compiled on a different platform.</param>
protected override bool IsMatch(Instruction instruction, MethodReference methodRef, bool platformChanged)
{
return
(!this.OnlyIfPlatformChanged || platformChanged)
&& methodRef.DeclaringType.FullName == this.FromType.FullName
&& this.HasMatchingSignature(this.ToType, methodRef);
}
/// <summary>Rewrite a method for compatibility.</summary>
/// <param name="module">The module being rewritten.</param>
/// <param name="cil">The CIL rewriter.</param>
/// <param name="instruction">The instruction which calls the method.</param>
/// <param name="methodRef">The method reference invoked by the <paramref name="instruction"/>.</param>
/// <param name="assemblyMap">Metadata for mapping assemblies to the current platform.</param>
protected override void Rewrite(ModuleDefinition module, ILProcessor cil, Instruction instruction, MethodReference methodRef, PlatformAssemblyMap assemblyMap)
{
methodRef.DeclaringType = module.Import(this.ToType);
}
}
}
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