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 field name to rewrite.</summary> private readonly string FieldName; /********* ** 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> public FieldToPropertyRewriter(Type type, string fieldName) : base(type.FullName, fieldName, InstructionHandleResult.None) { this.Type = type; this.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.FieldName}")); cil.Replace(instruction, cil.Create(OpCodes.Call, propertyRef)); return InstructionHandleResult.Rewritten; } } }