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using System;
using Mono.Cecil;
using Mono.Cecil.Cil;
namespace StardewModdingAPI.Framework.ModLoading.Rewriters
{
/// <summary>Rewrites method references from one parent type to another if the signatures match.</summary>
internal class MethodParentRewriter : IInstructionHandler
{
/*********
** 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 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>
public MethodParentRewriter(Type fromType, Type toType, bool onlyIfPlatformChanged = false)
{
this.FromType = fromType;
this.ToType = toType;
this.NounPhrase = $"{fromType.Name} methods";
this.OnlyIfPlatformChanged = onlyIfPlatformChanged;
}
/// <summary>Perform the predefined logic for a method if applicable.</summary>
/// <param name="module">The assembly module containing the instruction.</param>
/// <param name="method">The method definition containing the instruction.</param>
/// <param name="assemblyMap">Metadata for mapping assemblies to the current platform.</param>
/// <param name="platformChanged">Whether the mod was compiled on a different platform.</param>
public InstructionHandleResult Handle(ModuleDefinition module, MethodDefinition method, PlatformAssemblyMap assemblyMap, bool platformChanged)
{
return InstructionHandleResult.None;
}
/// <summary>Perform the predefined logic for an instruction if applicable.</summary>
/// <param name="module">The assembly module containing the instruction.</param>
/// <param name="cil">The CIL processor.</param>
/// <param name="instruction">The instruction to handle.</param>
/// <param name="assemblyMap">Metadata for mapping assemblies to the current platform.</param>
/// <param name="platformChanged">Whether the mod was compiled on a different platform.</param>
public InstructionHandleResult Handle(ModuleDefinition module, ILProcessor cil, Instruction instruction, PlatformAssemblyMap assemblyMap, bool platformChanged)
{
if (!this.IsMatch(instruction, platformChanged))
return InstructionHandleResult.None;
MethodReference methodRef = (MethodReference)instruction.Operand;
methodRef.DeclaringType = module.ImportReference(this.ToType);
return InstructionHandleResult.Rewritten;
}
/*********
** Protected methods
*********/
/// <summary>Get whether a CIL instruction matches.</summary>
/// <param name="instruction">The IL instruction.</param>
/// <param name="platformChanged">Whether the mod was compiled on a different platform.</param>
protected bool IsMatch(Instruction instruction, bool platformChanged)
{
MethodReference methodRef = RewriteHelper.AsMethodReference(instruction);
return
methodRef != null
&& (platformChanged || !this.OnlyIfPlatformChanged)
&& methodRef.DeclaringType.FullName == this.FromType.FullName
&& RewriteHelper.HasMatchingSignature(this.ToType, methodRef);
}
}
}
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