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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 static field references into constant values.</summary>
/// <typeparam name="TValue">The constant value type.</typeparam>
internal class StaticFieldToConstantRewriter<TValue> : FieldFinder
{
/*********
** Properties
*********/
/// <summary>The constant value to replace with.</summary>
private readonly TValue Value;
/*********
** 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="value">The constant value to replace with.</param>
public StaticFieldToConstantRewriter(Type type, string fieldName, TValue value)
: base(type.FullName, fieldName, InstructionHandleResult.None)
{
this.Value = value;
}
/// <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;
cil.Replace(instruction, this.CreateConstantInstruction(cil, this.Value));
return InstructionHandleResult.Rewritten;
}
/*********
** Private methods
*********/
/// <summary>Create a CIL constant value instruction.</summary>
/// <param name="cil">The CIL processor.</param>
/// <param name="value">The constant value to set.</param>
private Instruction CreateConstantInstruction(ILProcessor cil, object value)
{
if (typeof(TValue) == typeof(int))
return cil.Create(OpCodes.Ldc_I4, (int)value);
if (typeof(TValue) == typeof(string))
return cil.Create(OpCodes.Ldstr, (string)value);
throw new NotSupportedException($"Rewriting to constant values of type {typeof(TValue)} isn't currently supported.");
}
}
}
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