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using System;
using System.Reflection;
using Mono.Cecil;
using Mono.Cecil.Cil;
using StardewModdingAPI.AssemblyRewriters.Finders;
namespace StardewModdingAPI.AssemblyRewriters.Rewriters
{
/// <summary>Rewrites references to one field with another.</summary>
public class FieldReplaceRewriter : FieldFinder, IInstructionRewriter
{
/*********
** Properties
*********/
/// <summary>The type whose field to which references should be rewritten.</summary>
private readonly Type Type;
/// <summary>The new field name to reference.</summary>
private readonly string ToFieldName;
/*********
** 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>
/// <param name="nounPhrase">A brief noun phrase indicating what the instruction finder matches (or <c>null</c> to generate one).</param>
public FieldReplaceRewriter(Type type, string fromFieldName, string toFieldName, string nounPhrase = null)
: base(type.FullName, fromFieldName, nounPhrase)
{
this.Type = type;
this.ToFieldName = toFieldName;
}
/// <summary>Rewrite a CIL instruction for compatibility.</summary>
/// <param name="module">The module being rewritten.</param>
/// <param name="cil">The CIL rewriter.</param>
/// <param name="instruction">The instruction to rewrite.</param>
/// <param name="assemblyMap">Metadata for mapping assemblies to the current platform.</param>
public void Rewrite(ModuleDefinition module, ILProcessor cil, Instruction instruction, PlatformAssemblyMap assemblyMap)
{
FieldInfo field = this.Type.GetField(this.ToFieldName);
if (field == null)
throw new InvalidOperationException($"The {this.Type.FullName} class doesn't have a {this.ToFieldName} field.");
FieldReference newRef = module.Import(field);
cil.Replace(instruction, cil.Create(instruction.OpCode, newRef));
}
}
}
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