move facade namespace (#711)

1 files changed, 49 insertions, 0 deletions

diff --git a/src/SMAPI/Framework/ModLoading/RewriteFacades/HarmonyInstanceMethods.cs b/src/SMAPI/Framework/ModLoading/RewriteFacades/HarmonyInstanceMethods.cs
new file mode 100644
index 00000000..78cf25f8
--- /dev/null
+++ b/src/SMAPI/Framework/ModLoading/RewriteFacades/HarmonyInstanceMethods.cs
@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Reflection;
+using System.Reflection.Emit;
+using HarmonyLib;
+
+namespace StardewModdingAPI.Framework.ModLoading.RewriteFacades
+{
+    /// <summary>Maps Harmony 1.x <code>HarmonyInstance</code> methods to Harmony 2.x's <see cref="Harmony"/> to avoid breaking older mods.</summary>
+    /// <remarks>This is public to support SMAPI rewriting and should not be referenced directly by mods.</remarks>
+    [SuppressMessage("ReSharper", "CS1591", Justification = "Documentation not needed for facade classes.")]
+    public class HarmonyInstanceMethods : Harmony
+    {
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="id">The unique patch identifier.</param>
+        public HarmonyInstanceMethods(string id)
+            : base(id) { }
+
+        public static Harmony Create(string id)
+        {
+            return new Harmony(id);
+        }
+
+        public DynamicMethod Patch(MethodBase original, HarmonyMethod prefix = null, HarmonyMethod postfix = null, HarmonyMethod transpiler = null)
+        {
+            try
+            {
+                MethodInfo method = base.Patch(original: original, prefix: prefix, postfix: postfix, transpiler: transpiler);
+                return (DynamicMethod)method;
+            }
+            catch (Exception ex)
+            {
+                var patchTypes = new List<string>();
+                if (prefix != null)
+                    patchTypes.Add("prefix");
+                if (postfix != null)
+                    patchTypes.Add("postfix");
+                if (transpiler != null)
+                    patchTypes.Add("transpiler");
+
+                throw new Exception($"Harmony instance {this.Id} failed applying {string.Join("/", patchTypes)} to method {original.DeclaringType?.FullName}.{original.Name}.", ex);
+            }
+        }
+    }
+}