feat: extract shared Cecil weaving core

Editor/Core/PathAssemblyResolver.cs

@@ -0,0 +1,51 @@
+#nullable enable
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using Mono.Cecil;
+
+namespace ShrinkSDK.CodeGen
+{
+
+internal sealed class PathAssemblyResolver : IAssemblyResolver
+{
+    private readonly Dictionary<string, string> _paths = new(StringComparer.OrdinalIgnoreCase);
+    private readonly Dictionary<string, AssemblyDefinition> _assemblies = new(StringComparer.OrdinalIgnoreCase);
+    private AssemblyDefinition? _self;
+
+    public PathAssemblyResolver(IEnumerable<string> references)
+    {
+        foreach (var path in references.Where(File.Exists))
+            _paths[Path.GetFileNameWithoutExtension(path)] = Path.GetFullPath(path);
+    }
+
+    public void SetSelf(AssemblyDefinition assembly) => _self = assembly;
+
+    public AssemblyDefinition? Resolve(AssemblyNameReference name) => Resolve(name, new ReaderParameters());
+
+    public AssemblyDefinition? Resolve(AssemblyNameReference name, ReaderParameters parameters)
+    {
+        if (string.Equals(name.Name, _self?.Name.Name, StringComparison.OrdinalIgnoreCase))
+            return _self;
+        if (_assemblies.TryGetValue(name.Name, out var cached))
+            return cached;
+        if (!_paths.TryGetValue(name.Name, out var path))
+            return null;
+
+        parameters.AssemblyResolver = this;
+        parameters.ReadingMode = ReadingMode.Immediate;
+        var assembly = AssemblyDefinition.ReadAssembly(path, parameters);
+        _assemblies[name.Name] = assembly;
+        return assembly;
+    }
+
+    public void Dispose()
+    {
+        foreach (var assembly in _assemblies.Values)
+            assembly.Dispose();
+        _assemblies.Clear();
+    }
+}
+}