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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 event.</summary>
internal class EventFinder : BaseInstructionHandler
{
/*********
** Fields
*********/
/// <summary>The full type name for which to find references.</summary>
private readonly string FullTypeName;
/// <summary>The method names for which to find references.</summary>
private readonly ISet<string> MethodNames;
/// <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="eventNames">The event names for which to find references.</param>
/// <param name="result">The result to return for matching instructions.</param>
public EventFinder(string fullTypeName, string[] eventNames, InstructionHandleResult result)
: base(defaultPhrase: $"{string.Join(", ", eventNames.Select(p => $"{fullTypeName}.{p}"))} event{(eventNames.Length != 1 ? "s" : "")}") // default phrase should never be used
{
this.FullTypeName = fullTypeName;
this.Result = result;
this.MethodNames = new HashSet<string>();
foreach (string name in eventNames)
{
this.MethodNames.Add($"add_{name}");
this.MethodNames.Add($"remove_{name}");
}
}
/// <summary>Construct an instance.</summary>
/// <param name="fullTypeName">The full type name for which to find references.</param>
/// <param name="eventName">The event name for which to find references.</param>
/// <param name="result">The result to return for matching instructions.</param>
public EventFinder(string fullTypeName, string eventName, InstructionHandleResult result)
: this(fullTypeName, new[] { eventName }, result) { }
/// <inheritdoc />
public override bool Handle(ModuleDefinition module, ILProcessor cil, Instruction instruction)
{
if (this.MethodNames.Any())
{
MethodReference? methodRef = RewriteHelper.AsMethodReference(instruction);
if (methodRef != null && methodRef.DeclaringType.FullName == this.FullTypeName && this.MethodNames.Contains(methodRef.Name))
{
string eventName = methodRef.Name.Split(new[] { '_' }, 2)[1];
this.MethodNames.Remove($"add_{eventName}");
this.MethodNames.Remove($"remove_{eventName}");
this.MarkFlag(this.Result);
this.Phrases.Add($"{this.FullTypeName}.{eventName} event");
}
}
return false;
}
}
}
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