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using System;
using System.Collections.Generic;
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 new fields to reference indexed by the old field/type names.</summary>
private readonly Dictionary<string, Dictionary<string, FieldInfo>> FieldMaps = new();
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
public FieldReplaceRewriter()
: base(defaultPhrase: "field replacement") { } // will be overridden when a field is replaced
/// <summary>Add a field to replace.</summary>
/// <param name="fromType">The type whose field to rewrite.</param>
/// <param name="fromFieldName">The field name to rewrite.</param>
/// <param name="toType">The new type which will have the field.</param>
/// <param name="toFieldName">The new field name to reference.</param>
public FieldReplaceRewriter AddField(Type fromType, string fromFieldName, Type toType, string toFieldName)
{
// get full type name
string fromTypeName = fromType?.FullName;
if (fromTypeName == null)
throw new InvalidOperationException($"Can't replace field for invalid type reference {toType}.");
// get target field
FieldInfo toField = toType.GetField(toFieldName);
if (toField == null)
throw new InvalidOperationException($"The {toType.FullName} class doesn't have a {toFieldName} field.");
// add mapping
if (!this.FieldMaps.TryGetValue(fromTypeName, out var fieldMap))
this.FieldMaps[fromTypeName] = fieldMap = new();
fieldMap[fromFieldName] = toField;
return this;
}
/// <inheritdoc />
public override bool Handle(ModuleDefinition module, ILProcessor cil, Instruction instruction)
{
FieldReference fieldRef = RewriteHelper.AsFieldReference(instruction);
string declaringType = fieldRef?.DeclaringType?.FullName;
// get mapped field
if (declaringType == null || !this.FieldMaps.TryGetValue(declaringType, out var fieldMap) || !fieldMap.TryGetValue(fieldRef.Name, out FieldInfo toField))
return false;
// replace with new field
this.Phrases.Add($"{fieldRef.DeclaringType.Name}.{fieldRef.Name} field");
instruction.Operand = module.ImportReference(toField);
return this.MarkRewritten();
}
}
}
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