1 files changed, 74 insertions, 0 deletions
diff --git a/src/StardewModdingAPI.AssemblyRewriters/Rewriters/GenericMethodMapper.cs b/src/StardewModdingAPI.AssemblyRewriters/Rewriters/GenericMethodMapper.cs
new file mode 100644
index 00000000..92ba3af1
--- /dev/null
+++ b/src/StardewModdingAPI.AssemblyRewriters/Rewriters/GenericMethodMapper.cs
@@ -0,0 +1,74 @@
+using System;
+using Mono.Cecil;
+using Mono.Cecil.Cil;
+using StardewModdingAPI.AssemblyRewriters.Framework;
+
+namespace StardewModdingAPI.AssemblyRewriters.Rewriters
+{
+    /// <summary>Rewrites method references from one parent type to another if the signatures match.</summary>
+    public class GenericMethodMapper : BaseMethodRewriter
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>The type whose methods to remap.</summary>
+        private readonly Type FromType;
+
+        /// <summary>The type with methods to map to.</summary>
+        private readonly Type ToType;
+
+        /// <summary>Whether to only rewrite references if loading the assembly on a different platform than it was compiled on.</summary>
+        private readonly bool OnlyIfPlatformChanged;
+
+
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>A brief noun phrase indicating what the instruction finder matches.</summary>
+        public override string NounPhrase { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="fromType">The type whose methods to remap.</param>
+        /// <param name="toType">The type with methods to map to.</param>
+        /// <param name="nounPhrase">A brief noun phrase indicating what the instruction finder matches.</param>
+        /// <param name="onlyIfPlatformChanged">Whether to only rewrite references if loading the assembly on a different platform than it was compiled on.</param>
+        public GenericMethodMapper(Type fromType, Type toType, string nounPhrase, bool onlyIfPlatformChanged = false)
+        {
+            this.FromType = fromType;
+            this.ToType = toType;
+            this.NounPhrase = nounPhrase;
+            this.OnlyIfPlatformChanged = onlyIfPlatformChanged;
+        }
+
+
+        /*********
+        ** Protected methods
+        *********/
+        /// <summary>Get whether a method reference should be rewritten.</summary>
+        /// <param name="instruction">The IL instruction.</param>
+        /// <param name="methodRef">The method reference.</param>
+        /// <param name="platformChanged">Whether the mod was compiled on a different platform.</param>
+        protected override bool IsMatch(Instruction instruction, MethodReference methodRef, bool platformChanged)
+        {
+            return
+                (!this.OnlyIfPlatformChanged || platformChanged)
+                && methodRef.DeclaringType.FullName == this.FromType.FullName
+                && this.HasMatchingSignature(this.ToType, methodRef);
+        }
+
+        /// <summary>Rewrite a method for compatibility.</summary>
+        /// <param name="module">The module being rewritten.</param>
+        /// <param name="cil">The CIL rewriter.</param>
+        /// <param name="instruction">The instruction which calls the method.</param>
+        /// <param name="methodRef">The method reference invoked by the <paramref name="instruction"/>.</param>
+        /// <param name="assemblyMap">Metadata for mapping assemblies to the current platform.</param>
+        protected override void Rewrite(ModuleDefinition module, ILProcessor cil, Instruction instruction, MethodReference methodRef, PlatformAssemblyMap assemblyMap)
+        {
+            methodRef.DeclaringType = module.Import(this.ToType);
+        }
+    }
+}
+\ No newline at end of file