1 files changed, 52 insertions, 0 deletions
diff --git a/src/StardewModdingAPI.AssemblyRewriters/Framework/BaseTypeFinder.cs b/src/StardewModdingAPI.AssemblyRewriters/Framework/BaseTypeFinder.cs
new file mode 100644
index 00000000..5a768794
--- /dev/null
+++ b/src/StardewModdingAPI.AssemblyRewriters/Framework/BaseTypeFinder.cs
@@ -0,0 +1,52 @@
+using System.Linq;
+using Mono.Cecil;
+using Mono.Cecil.Cil;
+
+namespace StardewModdingAPI.AssemblyRewriters.Framework
+{
+    /// <summary>Base class for a type reference finder.</summary>
+    public abstract class BaseTypeFinder : IInstructionFinder
+    {
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>A brief noun phrase indicating what the instruction finder matches.</summary>
+        public abstract string NounPhrase { get; }
+
+        /// <summary>The full type name to match.</summary>
+        public abstract string FullTypeName { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Get whether a CIL instruction matches.</summary>
+        /// <param name="instruction">The IL instruction.</param>
+        /// <param name="platformChanged">Whether the mod was compiled on a different platform.</param>
+        public virtual bool IsMatch(Instruction instruction, bool platformChanged)
+        {
+            string fullName = this.FullTypeName;
+
+            // field reference
+            if (instruction.OpCode == OpCodes.Ldfld || instruction.OpCode == OpCodes.Ldsfld || instruction.OpCode == OpCodes.Stfld || instruction.OpCode == OpCodes.Stsfld)
+            {
+                FieldReference field = (FieldReference)instruction.Operand;
+                return
+                    field.DeclaringType.FullName == fullName // field on target class
+                    || field.FieldType.FullName == fullName; // field value is target class
+            }
+
+            // method reference
+            if (instruction.OpCode == OpCodes.Call || instruction.OpCode == OpCodes.Callvirt)
+            {
+                MethodReference method = (MethodReference)instruction.Operand;
+                return
+                    method.DeclaringType.FullName == fullName // method on target class
+                    || method.ReturnType.FullName == fullName // method returns target class
+                    || method.Parameters.Any(p => p.ParameterType.FullName == fullName); // method parameters
+            }
+
+            return false;
+        }
+    }
+}