1 files changed, 63 insertions, 0 deletions
diff --git a/src/SMAPI/Framework/ModLoading/Rewriters/StaticFieldToConstantRewriter.cs b/src/SMAPI/Framework/ModLoading/Rewriters/StaticFieldToConstantRewriter.cs
new file mode 100644
index 00000000..5e12b46a
--- /dev/null
+++ b/src/SMAPI/Framework/ModLoading/Rewriters/StaticFieldToConstantRewriter.cs
@@ -0,0 +1,63 @@
+using System;
+using Mono.Cecil;
+using Mono.Cecil.Cil;
+using StardewModdingAPI.Framework.ModLoading.Finders;
+
+namespace StardewModdingAPI.Framework.ModLoading.Rewriters
+{
+    /// <summary>Rewrites static field references into constant values.</summary>
+    /// <typeparam name="TValue">The constant value type.</typeparam>
+    internal class StaticFieldToConstantRewriter<TValue> : FieldFinder
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>The constant value to replace with.</summary>
+        private readonly TValue Value;
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="type">The type whose field to which references should be rewritten.</param>
+        /// <param name="fieldName">The field name to rewrite.</param>
+        /// <param name="value">The constant value to replace with.</param>
+        public StaticFieldToConstantRewriter(Type type, string fieldName, TValue value)
+            : base(type.FullName, fieldName, InstructionHandleResult.None)
+        {
+            this.Value = value;
+        }
+
+        /// <summary>Perform the predefined logic for an instruction if applicable.</summary>
+        /// <param name="module">The assembly module containing the instruction.</param>
+        /// <param name="cil">The CIL processor.</param>
+        /// <param name="instruction">The instruction to handle.</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>
+        public override InstructionHandleResult Handle(ModuleDefinition module, ILProcessor cil, Instruction instruction, PlatformAssemblyMap assemblyMap, bool platformChanged)
+        {
+            if (!this.IsMatch(instruction))
+                return InstructionHandleResult.None;
+
+            cil.Replace(instruction, this.CreateConstantInstruction(cil, this.Value));
+            return InstructionHandleResult.Rewritten;
+        }
+
+
+        /*********
+        ** Private methods
+        *********/
+        /// <summary>Create a CIL constant value instruction.</summary>
+        /// <param name="cil">The CIL processor.</param>
+        /// <param name="value">The constant value to set.</param>
+        private Instruction CreateConstantInstruction(ILProcessor cil, object value)
+        {
+            if (typeof(TValue) == typeof(int))
+                return cil.Create(OpCodes.Ldc_I4, (int)value);
+            if (typeof(TValue) == typeof(string))
+                return cil.Create(OpCodes.Ldstr, (string)value);
+            throw new NotSupportedException($"Rewriting to constant values of type {typeof(TValue)} isn't currently supported.");
+        }
+    }
+}