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using System;
using Mono.Cecil;
using Mono.Cecil.Cil;
using StardewModdingAPI.Framework.ModLoading.Finders;
namespace StardewModdingAPI.Framework.ModLoading.Rewriters
{
/// <summary>Rewrites field references into property references.</summary>
internal class FieldToPropertyRewriter : FieldFinder
{
/*********
** Properties
*********/
/// <summary>The type whose field to which references should be rewritten.</summary>
private readonly Type Type;
/// <summary>The property name.</summary>
private readonly string PropertyName;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="type">The type whose field to which references should be rewritten.</param>
/// <param name="fieldName">The field name to rewrite.</param>
/// <param name="propertyName">The property name (if different).</param>
public FieldToPropertyRewriter(Type type, string fieldName, string propertyName)
: base(type.FullName, fieldName, InstructionHandleResult.None)
{
this.Type = type;
this.PropertyName = propertyName;
}
/// <summary>Construct an instance.</summary>
/// <param name="type">The type whose field to which references should be rewritten.</param>
/// <param name="fieldName">The field name to rewrite.</param>
public FieldToPropertyRewriter(Type type, string fieldName)
: this(type, fieldName, fieldName) { }
/// <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;
string methodPrefix = instruction.OpCode == OpCodes.Ldsfld || instruction.OpCode == OpCodes.Ldfld ? "get" : "set";
MethodReference propertyRef = module.Import(this.Type.GetMethod($"{methodPrefix}_{this.PropertyName}"));
cil.Replace(instruction, cil.Create(OpCodes.Call, propertyRef));
return InstructionHandleResult.Rewritten;
}
}
}
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