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using System;
using System.Reflection;
using Mono.Cecil;
using Mono.Cecil.Cil;
using StardewModdingAPI.Framework.ModLoading.Framework;
namespace StardewModdingAPI.Framework.ModLoading.Rewriters
{
/// <summary>Rewrites references to one field with another.</summary>
internal class FieldReplaceRewriter : BaseInstructionHandler
{
/*********
** Fields
*********/
/// <summary>The type containing the field to which references should be rewritten.</summary>
private readonly Type Type;
/// <summary>The field name to which references should be rewritten.</summary>
private readonly string FromFieldName;
/// <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 rewrite.</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(defaultPhrase: $"{type.FullName}.{fromFieldName} field")
{
this.Type = type;
this.FromFieldName = fromFieldName;
this.ToField = type.GetField(toFieldName);
if (this.ToField == null)
throw new InvalidOperationException($"The {type.FullName} class doesn't have a {toFieldName} field.");
}
/// <summary>Rewrite a CIL instruction reference if needed.</summary>
/// <param name="module">The assembly module containing the instruction.</param>
/// <param name="cil">The CIL processor.</param>
/// <param name="instruction">The CIL instruction to handle.</param>
/// <param name="replaceWith">Replaces the CIL instruction with a new one.</param>
/// <returns>Returns whether the instruction was changed.</returns>
public override bool Handle(ModuleDefinition module, ILProcessor cil, Instruction instruction, Action<Instruction> replaceWith)
{
// get field reference
FieldReference fieldRef = RewriteHelper.AsFieldReference(instruction);
if (!RewriteHelper.IsFieldReferenceTo(fieldRef, this.Type.FullName, this.FromFieldName))
return false;
// replace with new field
FieldReference newRef = module.ImportReference(this.ToField);
replaceWith(cil.Create(instruction.OpCode, newRef));
return this.MarkRewritten();
}
}
}
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