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using System.Collections.Generic;
using System.Linq;
using Mono.Cecil;
using Mono.Cecil.Cil;
using StardewModdingAPI.Framework.ModLoading.Framework;
namespace StardewModdingAPI.Framework.ModLoading.Finders
{
/// <summary>Finds incompatible CIL instructions that reference a given field.</summary>
internal class FieldFinder : BaseInstructionHandler
{
/*********
** Fields
*********/
/// <summary>The full type name for which to find references.</summary>
private readonly string FullTypeName;
/// <summary>The field names for which to find references.</summary>
private readonly ISet<string> FieldNames;
/// <summary>The result to return for matching instructions.</summary>
private readonly InstructionHandleResult Result;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="fullTypeName">The full type name for which to find references.</param>
/// <param name="fieldNames">The field names for which to find references.</param>
/// <param name="result">The result to return for matching instructions.</param>
public FieldFinder(string fullTypeName, string[] fieldNames, InstructionHandleResult result)
: base(defaultPhrase: $"{string.Join(", ", fieldNames.Select(p => $"{fullTypeName}.{p}"))} field{(fieldNames.Length != 1 ? "s" : "")}") // default phrase should never be used
{
this.FullTypeName = fullTypeName;
this.FieldNames = new HashSet<string>(fieldNames);
this.Result = result;
}
/// <summary>Construct an instance.</summary>
/// <param name="fullTypeName">The full type name for which to find references.</param>
/// <param name="fieldName">The field name for which to find references.</param>
/// <param name="result">The result to return for matching instructions.</param>
public FieldFinder(string fullTypeName, string fieldName, InstructionHandleResult result)
: this(fullTypeName, new[] { fieldName }, result) { }
/// <inheritdoc />
public override bool Handle(ModuleDefinition module, ILProcessor cil, Instruction instruction)
{
if (this.FieldNames.Any())
{
FieldReference? fieldRef = RewriteHelper.AsFieldReference(instruction);
if (fieldRef != null && fieldRef.DeclaringType.FullName == this.FullTypeName && this.FieldNames.Contains(fieldRef.Name))
{
this.FieldNames.Remove(fieldRef.Name);
this.MarkFlag(this.Result);
this.Phrases.Add($"{this.FullTypeName}.{fieldRef.Name} field");
}
}
return false;
}
}
}
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