Add support for local function indexing in C# (#37)

Author: sagi1623

ScipDotnet/ScipCSharpSyntaxWalker.cs

@@ -112,6 +112,12 @@ public override void VisitMethodDeclaration(MethodDeclarationSyntax node)
         base.VisitMethodDeclaration(node);
     }
 
+    public override void VisitLocalFunctionStatement(LocalFunctionStatementSyntax node)
+    {
+        _scipDocumentIndexer.VisitOccurrence(_semanticModel.GetDeclaredSymbol(node), node.Identifier.GetLocation(), true);
+        base.VisitLocalFunctionStatement(node);
+    }
+
     public override void VisitParameter(ParameterSyntax node)
     {
         _scipDocumentIndexer.VisitOccurrence(_semanticModel.GetDeclaredSymbol(node), node.Identifier.GetLocation(), true);

ScipDotnet/ScipDocumentIndexer.cs

@@ -371,6 +371,7 @@ private static bool IsLocalSymbol(ISymbol sym)
                // Anonymous classes/methods have empty names and can not be accessed outside their file.
                // The "global namespace" (parent of all namespaces) also has an empty name and should not
                // be treated as a local variable.
+               sym is IMethodSymbol { MethodKind: MethodKind.LocalFunction } ||
                (sym.Name.Equals("") && sym.Kind != SymbolKind.Namespace);
     }
 }

snapshots/input/syntax/Main/Methods.cs

@@ -95,4 +95,19 @@ public static void InheritedOverloads()
         new InheritedOverloads3().Method("42");
     }
 
+    public class LocalFunction
+    {
+        public static void Method()
+        {
+            var myWorld = GetWorld();
+            SayHi(myWorld);
+
+            string GetWorld() => "world";
+
+            void SayHi(string world)
+            {
+                Console.WriteLine($"Hello {world}!");
+            }
+        }
+    }
 }

snapshots/output-net6.0/syntax/Main/Methods.cs

@@ -210,4 +210,35 @@ public static void InheritedOverloads()
 //                                  ^^^^^^ reference scip-dotnet nuget . . Main/Methods#InheritedOverloads3#Method().
       }
 
+      public class LocalFunction
+//                 ^^^^^^^^^^^^^ definition scip-dotnet nuget . . Main/Methods#LocalFunction#
+//                               documentation ```cs\nclass LocalFunction\n```
+      {
+          public static void Method()
+//                           ^^^^^^ definition scip-dotnet nuget . . Main/Methods#LocalFunction#Method().
+//                                  documentation ```cs\npublic static void LocalFunction.Method()\n```
+          {
+              var myWorld = GetWorld();
+//                ^^^^^^^ definition local 0
+//                        documentation ```cs\nstring? myWorld\n```
+//                          ^^^^^^^^ reference local 1
+              SayHi(myWorld);
+//            ^^^^^ reference local 2
+//                  ^^^^^^^ reference local 0
+
+              string GetWorld() => "world";
+//                   ^^^^^^^^ definition local 1
+//                            documentation ```cs\nstring GetWorld()\n```
+
+              void SayHi(string world)
+//                 ^^^^^ definition local 2
+//                       documentation ```cs\nvoid SayHi(string world)\n```
+//                              ^^^^^ definition local 3
+//                                    documentation ```cs\nstring world\n```
+              {
+                  Console.WriteLine($"Hello {world}!");
+//                                           ^^^^^ reference local 3
+              }
+          }
+      }
   }

snapshots/output-net7.0/syntax/Main/Methods.cs

@@ -214,4 +214,37 @@ public static void InheritedOverloads()
 //                                  ^^^^^^ reference scip-dotnet nuget . . Main/Methods#InheritedOverloads3#Method().
       }
 
+      public class LocalFunction
+//                 ^^^^^^^^^^^^^ definition scip-dotnet nuget . . Main/Methods#LocalFunction#
+//                               documentation ```cs\nclass LocalFunction\n```
+      {
+          public static void Method()
+//                           ^^^^^^ definition scip-dotnet nuget . . Main/Methods#LocalFunction#Method().
+//                                  documentation ```cs\npublic static void LocalFunction.Method()\n```
+          {
+              var myWorld = GetWorld();
+//                ^^^^^^^ definition local 0
+//                        documentation ```cs\nstring? myWorld\n```
+//                          ^^^^^^^^ reference local 1
+              SayHi(myWorld);
+//            ^^^^^ reference local 2
+//                  ^^^^^^^ reference local 0
+
+              string GetWorld() => "world";
+//                   ^^^^^^^^ definition local 1
+//                            documentation ```cs\nstring GetWorld()\n```
+
+              void SayHi(string world)
+//                 ^^^^^ definition local 2
+//                       documentation ```cs\nvoid SayHi(string world)\n```
+//                              ^^^^^ definition local 3
+//                                    documentation ```cs\nstring world\n```
+              {
+                  Console.WriteLine($"Hello {world}!");
+//                ^^^^^^^ reference scip-dotnet nuget System.Console 7.0.0.0 System/Console#
+//                        ^^^^^^^^^ reference scip-dotnet nuget System.Console 7.0.0.0 System/Console#WriteLine(+11).
+//                                           ^^^^^ reference local 3
+              }
+          }
+      }
   }