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using System;
using System.Reflection;
using Mono.Cecil;
using Mono.Cecil.Cil;
using StardewModdingAPI.Framework.ModLoading.Finders;
namespace StardewModdingAPI.Framework.ModLoading.Rewriters
{
/// <summary>Rewrites references to one field with another.</summary>
internal class FieldReplaceRewriter : FieldFinder
{
/*********
** Properties
*********/
/// <summary>The new field to reference.</summary>
private readonly FieldInfo ToField;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="type">The type whose field to which references should be rewritten.</param>
/// <param name="fromFieldName">The field name to rewrite.</param>
/// <param name="toFieldName">The new field name to reference.</param>
public FieldReplaceRewriter(Type type, string fromFieldName, string toFieldName)
: base(type.FullName, fromFieldName, InstructionHandleResult.None)
{
this.ToField = type.GetField(toFieldName);
if (this.ToField == null)
throw new InvalidOperationException($"The {type.FullName} class doesn't have a {toFieldName} field.");
}
/// <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 override InstructionHandleResult Handle(ModuleDefinition module, ILProcessor cil, Instruction instruction, PlatformAssemblyMap assemblyMap, bool platformChanged)
{
if (!this.IsMatch(instruction))
return InstructionHandleResult.None;
FieldReference newRef = module.Import(this.ToField);
cil.Replace(instruction, cil.Create(instruction.OpCode, newRef));
return InstructionHandleResult.Rewritten;
}
}
}
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