fixed group of module can't navi, no langserver for swiftinterface

Author: Wang Lun

Sources/LanguageServerProtocolExtensions/Language+Inference.swift

@@ -39,7 +39,7 @@ extension Language {
     case "cpp", "cc", "cxx", "hpp": self = .cpp
     case "m": self = .objective_c
     case "mm", "h": self = .objective_cpp
-    case "swift": self = .swift
+    case "swift", "swiftinterface": self = .swift
     default: return nil
     }
   }

Sources/SKTestSupport/Utils.swift

@@ -32,7 +32,7 @@ extension Language {
     case "cpp": self = .cpp
     case "m": self = .objective_c
     case "mm": self = .objective_cpp
-    case "swift": self = .swift
+    case "swift", "swiftinterface": self = .swift
     case "md": self = .markdown
     case "tutorial": self = .tutorial
     default: return nil

Sources/SourceKitLSP/SourceKitLSPServer.swift

@@ -553,7 +553,7 @@ package actor SourceKitLSPServer {
     }
 
     let toolchain = await workspace.buildServerManager.toolchain(
-      for: uri,
+      for: uri.buildSettingsFile,
       in: workspace.buildServerManager.canonicalTarget(for: uri),
       language: language
     )
@@ -1850,10 +1850,24 @@ extension SourceKitLSPServer {
     languageService: LanguageService
   ) async throws -> [Location] {
     // If this symbol is a module then generate a textual interface
-    if symbol.kind == .module, let name = symbol.name {
+    if symbol.kind == .module {
+      // For module symbols, prefer using systemModule information if available
+      let moduleName: String
+      let groupName: String?
+      
+      if let systemModule = symbol.systemModule {
+        moduleName = systemModule.moduleName
+        groupName = systemModule.groupName
+      } else if let name = symbol.name {
+        moduleName = name
+        groupName = nil
+      } else {
+        return []
+      }
+      
       let interfaceLocation = try await self.definitionInInterface(
-        moduleName: name,
-        groupName: nil,
+        moduleName: moduleName,
+        groupName: groupName,
         symbolUSR: nil,
         originatorUri: uri,
         languageService: languageService

Sources/SourceKitLSP/Swift/ReferenceDocumentURL.swift

@@ -165,13 +165,14 @@ extension DocumentURI {
       return referenceDocument.buildSettingsFile
     }
     return self
+  }  /// Convert sourcekit-lsp:// URIs to actual file system paths when possible.
+  /// For generated Swift interfaces, this returns the path where the interface file
+  /// would be stored in the GeneratedInterfaces directory.
+  var actualFileSystemPath: DocumentURI {
+    return self
   }
 }
 
 package struct ReferenceDocumentURLError: Error, CustomStringConvertible {
   package var description: String
-
-  init(description: String) {
-    self.description = description
-  }
 }