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using System;
using System.Collections.Generic;
using System.Linq;
using Mono.Cecil;
using Mono.Cecil.Cil;
using StardewModdingAPI.Framework.ModLoading.Framework;
namespace StardewModdingAPI.Framework.ModLoading.Rewriters
{
/// <summary>Rewrites references to fields which no longer exist, but which have an equivalent property with the exact same name.</summary>
internal class FieldToPropertyRewriter : BaseInstructionHandler
{
/*********
** Fields
*********/
/// <summary>The assembly names to which to rewrite broken references.</summary>
private readonly HashSet<string> RewriteReferencesToAssemblies;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="rewriteReferencesToAssemblies">The assembly names to which to rewrite broken references.</param>
public FieldToPropertyRewriter(string[] rewriteReferencesToAssemblies)
: base(defaultPhrase: "field changed to property") // ignored since we specify phrases
{
this.RewriteReferencesToAssemblies = new HashSet<string>(rewriteReferencesToAssemblies);
}
/// <inheritdoc />
public override bool Handle(ModuleDefinition module, ILProcessor cil, Instruction instruction, Action<Instruction> replaceWith)
{
// get field ref
FieldReference fieldRef = RewriteHelper.AsFieldReference(instruction);
if (fieldRef == null || !this.ShouldValidate(fieldRef.DeclaringType))
return false;
// skip if not broken
if (fieldRef.Resolve() != null)
return false;
// get equivalent property
PropertyDefinition property = fieldRef.DeclaringType.Resolve().Properties.FirstOrDefault(p => p.Name == fieldRef.Name);
MethodDefinition method = instruction.OpCode == OpCodes.Ldsfld || instruction.OpCode == OpCodes.Ldfld
? property?.GetMethod
: property?.SetMethod;
if (method == null)
return false;
// rewrite field to property
MethodReference propertyRef = module.ImportReference(method);
replaceWith(cil.Create(OpCodes.Call, propertyRef));
this.Phrases.Add($"{fieldRef.DeclaringType.Name}.{fieldRef.Name} (field => property)");
return this.MarkRewritten();
}
/*********
** Private methods
*********/
/// <summary>Whether references to the given type should be validated.</summary>
/// <param name="type">The type reference.</param>
private bool ShouldValidate(TypeReference type)
{
return type != null && this.RewriteReferencesToAssemblies.Contains(type.Scope.Name);
}
}
}
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