1 files changed, 54 insertions, 0 deletions
diff --git a/src/SMAPI/Framework/ModLoading/Symbols/SymbolReaderProvider.cs b/src/SMAPI/Framework/ModLoading/Symbols/SymbolReaderProvider.cs
new file mode 100644
index 00000000..44074337
--- /dev/null
+++ b/src/SMAPI/Framework/ModLoading/Symbols/SymbolReaderProvider.cs
@@ -0,0 +1,54 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using Mono.Cecil;
+using Mono.Cecil.Cil;
+
+namespace StardewModdingAPI.Framework.ModLoading.Symbols
+{
+    /// <summary>Provides assembly symbol readers for Mono.Cecil.</summary>
+    internal class SymbolReaderProvider : ISymbolReaderProvider
+    {
+        /*********
+        ** Fields
+        *********/
+        /// <summary>The underlying symbol reader provider.</summary>
+        private readonly ISymbolReaderProvider BaseProvider = new DefaultSymbolReaderProvider(throwIfNoSymbol: false);
+
+        /// <summary>The symbol data loaded by absolute assembly path.</summary>
+        private readonly Dictionary<string, Stream> SymbolsByAssemblyPath = new Dictionary<string, Stream>(StringComparer.OrdinalIgnoreCase);
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Add the symbol file for a given assembly name, if it's not already registered.</summary>
+        /// <param name="fileName">The assembly file name.</param>
+        /// <param name="getSymbolStream">Get the raw file stream for the symbols.</param>
+        public void TryAddSymbolData(string fileName, Func<Stream> getSymbolStream)
+        {
+            if (!this.SymbolsByAssemblyPath.ContainsKey(fileName))
+                this.SymbolsByAssemblyPath.Add(fileName, getSymbolStream());
+        }
+
+        /// <summary>Get a symbol reader for a given module and assembly name.</summary>
+        /// <param name="module">The loaded assembly module.</param>
+        /// <param name="fileName">The assembly file name.</param>
+        public ISymbolReader GetSymbolReader(ModuleDefinition module, string fileName)
+        {
+            return this.SymbolsByAssemblyPath.TryGetValue(module.Name, out Stream symbolData)
+                ? new SymbolReader(module, symbolData)
+                : this.BaseProvider.GetSymbolReader(module, fileName);
+        }
+
+        /// <summary>Get a symbol reader for a given module and symbol stream.</summary>
+        /// <param name="module">The loaded assembly module.</param>
+        /// <param name="symbolStream">The loaded symbol file stream.</param>
+        public ISymbolReader GetSymbolReader(ModuleDefinition module, Stream symbolStream)
+        {
+            return this.SymbolsByAssemblyPath.TryGetValue(module.Name, out Stream symbolData)
+                ? new SymbolReader(module, symbolData)
+                : this.BaseProvider.GetSymbolReader(module, symbolStream);
+        }
+    }
+}