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using Mono.Cecil;
using Mono.Cecil.Cil;
namespace StardewModdingAPI.AssemblyRewriters.Finders
{
/// <summary>Finds incompatible CIL instructions that reference a given event and throws an <see cref="IncompatibleInstructionException"/>.</summary>
public class EventFinder : IInstructionRewriter
{
/*********
** Properties
*********/
/// <summary>The full type name for which to find references.</summary>
private readonly string FullTypeName;
/// <summary>The event name for which to find references.</summary>
private readonly string EventName;
/*********
** Accessors
*********/
/// <summary>A brief noun phrase indicating what the instruction finder matches.</summary>
public string NounPhrase { get; }
/*********
** Public methods
*********/
/// <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="nounPhrase">A brief noun phrase indicating what the instruction finder matches (or <c>null</c> to generate one).</param>
public EventFinder(string fullTypeName, string eventName, string nounPhrase = null)
{
this.FullTypeName = fullTypeName;
this.EventName = eventName;
this.NounPhrase = nounPhrase ?? $"{fullTypeName}.{eventName} event";
}
/// <summary>Rewrite a method definition for compatibility.</summary>
/// <param name="module">The module being rewritten.</param>
/// <param name="method">The method definition to rewrite.</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>
/// <returns>Returns whether the instruction was rewritten.</returns>
/// <exception cref="IncompatibleInstructionException">The CIL instruction is not compatible, and can't be rewritten.</exception>
public virtual bool Rewrite(ModuleDefinition module, MethodDefinition method, PlatformAssemblyMap assemblyMap, bool platformChanged)
{
return false;
}
/// <summary>Rewrite a CIL instruction for compatibility.</summary>
/// <param name="module">The module being rewritten.</param>
/// <param name="cil">The CIL rewriter.</param>
/// <param name="instruction">The instruction to rewrite.</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>
/// <returns>Returns whether the instruction was rewritten.</returns>
/// <exception cref="IncompatibleInstructionException">The CIL instruction is not compatible, and can't be rewritten.</exception>
public virtual bool Rewrite(ModuleDefinition module, ILProcessor cil, Instruction instruction, PlatformAssemblyMap assemblyMap, bool platformChanged)
{
if (!this.IsMatch(instruction))
return false;
throw new IncompatibleInstructionException(this.NounPhrase);
}
/*********
** Protected methods
*********/
/// <summary>Get whether a CIL instruction matches.</summary>
/// <param name="instruction">The IL instruction.</param>
protected bool IsMatch(Instruction instruction)
{
MethodReference methodRef = RewriteHelper.AsMethodReference(instruction);
return
methodRef != null
&& methodRef.DeclaringType.FullName == this.FullTypeName
&& (methodRef.Name == "add_" + this.EventName || methodRef.Name == "remove_" + this.EventName);
}
}
}
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