Merge pull request #5 from mahalex/evaluate

Implement evaluation

ConsoleDemo/DumbWalker.cs

@@ -22,8 +22,8 @@ namespace ConsoleDemo
         {
             switch (lhs.Kind)
             {
-                case TokenKind.IdentifierName:
-                    var name = ((IdentifierNameSyntaxNode) lhs).Name.Text;
+                case TokenKind.IdentifierNameExpression:
+                    var name = ((IdentifierNameExpressionSyntaxNode) lhs).Name.Text;
                     Console.WriteLine($"Adding variable assignment for {name}");
                     _variableAssignments.Add(name, new Variable());
                     break;
@@ -66,8 +66,8 @@ namespace ConsoleDemo
         {
             switch (node.Kind)
             {
-                case TokenKind.IdentifierName:
-                    var name = (IdentifierNameSyntaxNode) node;
+                case TokenKind.IdentifierNameExpression:
+                    var name = (IdentifierNameExpressionSyntaxNode) node;
                     if (_context.FindFunction(name.Name.Text))
                     {
                         return true;
@@ -90,7 +90,7 @@ namespace ConsoleDemo
             Variable assignment;
             switch (node.Kind)
             {
-                case TokenKind.IdentifierName:
+                case TokenKind.IdentifierNameExpression:
                     assignment = _variableAssignments.Find(node.Text);
                     if (assignment != null || node.Text == "end")
                     {
@@ -98,12 +98,12 @@ namespace ConsoleDemo
                     }
 
                     break;
-                case TokenKind.FunctionCall:
+                case TokenKind.FunctionCallExpression:
                     var functionCall = (FunctionCallExpressionSyntaxNode)node;
                     return
                         (IsDefined(functionCall.FunctionName) && IsDefined(functionCall.Nodes)) ||
                         (IsDefinedFunctionName(functionCall.FunctionName) && IsDefined(functionCall.Nodes));
-                case TokenKind.CellArrayElementAccess:
+                case TokenKind.CellArrayElementAccessExpression:
                     var cellArrayElementAccess = (CellArrayElementAccessExpressionSyntaxNode) node;
                     return IsDefined(cellArrayElementAccess.Expression) && IsDefined(cellArrayElementAccess.Nodes);
                 case TokenKind.List:
@@ -113,7 +113,7 @@ namespace ConsoleDemo
                     return true;
                 case TokenKind.StringLiteralExpression:
                     return true;
-                case TokenKind.BinaryOperation:
+                case TokenKind.BinaryOperationExpression:
                     var binaryOperation = (BinaryOperationExpressionSyntaxNode) node;
                     return IsDefined(binaryOperation.Lhs) && IsDefined(binaryOperation.Rhs);
                 case TokenKind.UnaryPrefixOperationExpression:
@@ -139,7 +139,7 @@ namespace ConsoleDemo
                 {
                     var parameterAsNode = parameter.AsNode();
                     Console.WriteLine($"Parameter node: {parameterAsNode}");
-                    if (parameterAsNode.Kind == TokenKind.IdentifierName)
+                    if (parameterAsNode.Kind == TokenKind.IdentifierNameExpression)
                     {
                         Console.WriteLine($"Adding variable assignment for {parameterAsNode.Text}");
                         _variableAssignments.Add(parameterAsNode.Text, new Variable());
@@ -159,17 +159,17 @@ namespace ConsoleDemo
             _insideFunction = false;
         }
 
-        public override void VisitMethodDefinition(MethodDefinitionSyntaxNode node)
+        public override void VisitConcreteMethodDeclaration(ConcreteMethodDeclarationSyntaxNode node)
         {
             _insideMethod = true;
-            base.VisitMethodDefinition(node);
+            base.VisitConcreteMethodDeclaration(node);
             _insideMethod = false;
         }
 
         public override void VisitFile(FileSyntaxNode node)
         {
             _methodAssignments = new MethodAssignments();
-            foreach (var nodeOrToken in node.StatementList)
+            foreach (var nodeOrToken in node.Body.Statements)
             {
                 if (nodeOrToken.IsToken)
                 {

ConsoleDemo/PrettyPrinter.cs

@@ -8,7 +8,7 @@ namespace ProjectConsole
     {
         public override void VisitFile(FileSyntaxNode node)
         {
-            Visit(node.StatementList);
+            Visit(node.Body.Statements);
             OutputKeyword(node.EndOfFile);
         }
 
@@ -118,7 +118,7 @@ namespace ProjectConsole
             OutputKeyword(node.ClassdefKeyword);
             Visit(node.Attributes);
             BoldOn();
-            Visit(node.ClassName);
+            OutputIdentifier(node.ClassName);
             BoldOff();
             Visit(node.BaseClassList);
             Visit(node.Nodes);
@@ -186,7 +186,7 @@ namespace ProjectConsole
             OutputKeyword(node.EndKeyword);
         }
 
-        public override void VisitMethodDefinition(MethodDefinitionSyntaxNode node)
+        public override void VisitConcreteMethodDeclaration(ConcreteMethodDeclarationSyntaxNode node)
         {
             OutputKeyword(node.FunctionKeyword);
             Visit(node.OutputDescription);
@@ -274,7 +274,7 @@ namespace ProjectConsole
             OutputBracket(node.ClosingBrace);            
         }
 
-        public override void VisitIdentifierName(IdentifierNameSyntaxNode node)
+        public override void VisitIdentifierNameExpression(IdentifierNameExpressionSyntaxNode node)
         {
             OutputIdentifier(node.Name);
         }
@@ -306,12 +306,12 @@ namespace ProjectConsole
             OutputControlKeyword(node.EndKeyword);
         }
 
-        public override void VisitUnquotedStringLiteral(UnquotedStringLiteralSyntaxNode node)
+        public override void VisitUnquotedStringLiteralExpression(UnquotedStringLiteralExpressionSyntaxNode node)
         {
             OutputUnquotedStringLiteral(node.StringToken);
         }
 
-        public override void VisitStringLiteral(StringLiteralSyntaxNode node)
+        public override void VisitStringLiteralExpression(StringLiteralExpressionSyntaxNode node)
         {
             OutputStringLiteral(node.StringToken);
         }
@@ -355,11 +355,11 @@ namespace ProjectConsole
 
         public override void VisitCommandExpression(CommandExpressionSyntaxNode node)
         {
-            Visit(node.CommandName);
+            OutputIdentifier(node.CommandName);
             Visit(node.Arguments);
         }
 
-        public override void VisitNumberLiteral(NumberLiteralSyntaxNode node)
+        public override void VisitNumberLiteralExpression(NumberLiteralExpressionSyntaxNode node)
         {
             OutputNumberLiteral(node.Number);
         }
@@ -370,13 +370,13 @@ namespace ProjectConsole
             Visit(node.Operand);
         }
 
-        public override void VisitUnaryPostixOperationExpression(UnaryPostixOperationExpressionSyntaxNode node)
+        public override void VisitUnaryPostfixOperationExpression(UnaryPostfixOperationExpressionSyntaxNode node)
         {
             Visit(node.Operand);
             OutputOperator(node.Operation);
         }
 
-        public override void VisitBaseClassInvokation(BaseClassInvokationSyntaxNode node)
+        public override void VisitClassInvokationExpression(ClassInvokationExpressionSyntaxNode node)
         {
             Visit(node.MethodName);
             OutputOperator(node.AtSign);
@@ -391,7 +391,7 @@ namespace ProjectConsole
 
         public override void VisitAttribute(AttributeSyntaxNode node)
         {
-            Visit(node.Name);
+            OutputIdentifier(node.Name);
             Visit(node.Assignment);
         }
 
@@ -410,12 +410,12 @@ namespace ProjectConsole
             OutputBracket(node.ClosingBrace);
         }
 
-        public override void VisitCompoundName(CompoundNameSyntaxNode node)
+        public override void VisitCompoundNameExpression(CompoundNameExpressionSyntaxNode node)
         {
             Visit(node.Nodes);
         }
 
-        public override void VisitDoubleQuotedStringLiteral(DoubleQuotedStringLiteralSyntaxNode node)
+        public override void VisitDoubleQuotedStringLiteralExpression(DoubleQuotedStringLiteralExpressionSyntaxNode node)
         {
             OutputStringLiteral(node.StringToken);
         }
@@ -454,7 +454,7 @@ namespace ProjectConsole
 
         public override void VisitEnumerationItem(EnumerationItemSyntaxNode node)
         {
-            Visit(node.Name);
+            OutputIdentifier(node.Name);
             Visit(node.Values);
             Visit(node.Commas);
         }
@@ -472,27 +472,27 @@ namespace ProjectConsole
             OutputOperator(node.AssignmentSign);
         }
 
-        public override void VisitIndirectMemberAccess(IndirectMemberAccessSyntaxNode node)
+        public override void VisitIndirectMemberAccessExpression(IndirectMemberAccessExpressionSyntaxNode node)
         {
             OutputBracket(node.OpeningBracket);
             Visit(node.Expression);
             OutputBracket(node.ClosingBracket);
         }
 
-        public override void VisitLambda(LambdaSyntaxNode node)
+        public override void VisitLambdaExpression(LambdaExpressionSyntaxNode node)
         {
             OutputOperator(node.AtSign);
             Visit(node.Input);
             Visit(node.Body);
         }
 
-        public override void VisitNamedFunctionHandle(NamedFunctionHandleSyntaxNode node)
+        public override void VisitNamedFunctionHandleExpression(NamedFunctionHandleExpressionSyntaxNode node)
         {
             OutputOperator(node.AtSign);
             Visit(node.FunctionName);
         }
 
-        public override void VisitMemberAccess(MemberAccessSyntaxNode node)
+        public override void VisitMemberAccessExpression(MemberAccessExpressionSyntaxNode node)
         {
             Visit(node.LeftOperand);
             OutputOperator(node.Dot);

ConsoleDemo/Program.cs

@@ -1,5 +1,4 @@
 using Parser;
-using Semantics;
 using System;
 using System.IO;
 using System.Linq;
@@ -72,7 +71,7 @@ namespace ConsoleDemo
             var childNodesAndTokens = root.GetChildNodesAndTokens();
             var node = childNodesAndTokens[0].AsNode();
             var classChildNodesAndTokens = node.GetChildNodesAndTokens();
-            var c = GetClass.FromTree(root, fileName);
+            var c = Semantics.GetClass.FromTree(root, fileName);
             Console.WriteLine(c.Name);
             foreach (var m in c.Methods)
             {
@@ -86,13 +85,13 @@ namespace ConsoleDemo
 
         public static void ContextDemo()
         {
-            var context = new Context();
+            var context = new Semantics.Context();
             context.ScanPath(BaseDirectory);
         }
 
         public static void DumbPrinterDemo()
         {
-            var context = new Context();
+            var context = new Semantics.Context();
             context.ScanPath(BaseDirectory);
             var fileName = Path.Combine(
                 BaseDirectory,
@@ -105,7 +104,7 @@ namespace ConsoleDemo
 
         public static void UsageDemo()
         {
-            var context = new Context();
+            var context = new Semantics.Context();
             context.ScanPath(BaseDirectory);
             var fileName = Path.Combine(
                 BaseDirectory,
@@ -130,7 +129,6 @@ namespace ConsoleDemo
             //ContextDemo();
             //DumbPrinterDemo();
             //UsageDemo();
-            Console.ReadKey();
         }
     }
 }

ConsoleDemo/UsageGathering.cs

@@ -49,8 +49,8 @@ namespace ConsoleDemo
         {
             switch (lhs.Kind)
             {
-                case TokenKind.IdentifierName:
-                    var name = ((IdentifierNameSyntaxNode)lhs).Name.Text;
+                case TokenKind.IdentifierNameExpression:
+                    var name = ((IdentifierNameExpressionSyntaxNode)lhs).Name.Text;
                     Console.WriteLine($"Adding variable assignment for {name}");
                     _variableAssignments.Add(name, new Variable());
                     break;
@@ -72,7 +72,7 @@ namespace ConsoleDemo
         public override void VisitFile(FileSyntaxNode node)
         {
             _methodAssignments = new MethodAssignments();
-            foreach (var nodeOrToken in node.StatementList)
+            foreach (var nodeOrToken in node.Body.Statements)
             {
                 if (nodeOrToken.IsToken)
                 {
@@ -100,7 +100,7 @@ namespace ConsoleDemo
                 {
                     var parameterAsNode = parameter.AsNode();
                     Console.WriteLine($"Parameter node: {parameterAsNode}");
-                    if (parameterAsNode.Kind == TokenKind.IdentifierName)
+                    if (parameterAsNode.Kind == TokenKind.IdentifierNameExpression)
                     {
                         Console.WriteLine($"Adding variable assignment for {parameterAsNode.Text}");
                         _variableAssignments.Add(parameterAsNode.Text, new Variable());
@@ -120,7 +120,7 @@ namespace ConsoleDemo
             _insideFunction = false;
         }
 
-        public override void VisitMethodDefinition(MethodDefinitionSyntaxNode node)
+        public override void VisitConcreteMethodDeclaration(ConcreteMethodDeclarationSyntaxNode node)
         {
             _insideMethod = true;
             _variableAssignments = new VariableAssignments();
@@ -131,7 +131,7 @@ namespace ConsoleDemo
                 {
                     var parameterAsNode = parameter.AsNode();
                     Console.WriteLine($"Parameter node: {parameterAsNode}");
-                    if (parameterAsNode.Kind == TokenKind.IdentifierName)
+                    if (parameterAsNode.Kind == TokenKind.IdentifierNameExpression)
                     {
                         Console.WriteLine($"Adding variable assignment for {parameterAsNode.Text}");
                         _variableAssignments.Add(parameterAsNode.Text, new Variable());
@@ -146,7 +146,7 @@ namespace ConsoleDemo
                     Console.WriteLine($"Parameter token: {parameter.AsToken()}");
                 }
             }
-            base.VisitMethodDefinition(node);
+            base.VisitConcreteMethodDeclaration(node);
             _variableAssignments = null;
             _insideMethod = false;
         }

MApplication/ColoringVisitor.cs

@@ -75,7 +75,7 @@ namespace MApplication
 
         public override void VisitFile(FileSyntaxNode node)
         {
-            Visit(node.StatementList);
+            Visit(node.Body.Statements);
             AddToken(node.EndOfFile, _scheme.Keyword);
         }
 
@@ -89,7 +89,7 @@ namespace MApplication
         {
             AddToken(node.ClassdefKeyword, _scheme.Keyword);
             Visit(node.Attributes);
-            Visit(node.ClassName);
+            AddToken(node.ClassName, _scheme.Identifier);
             Visit(node.BaseClassList);
             Visit(node.Nodes);
             AddToken(node.EndKeyword, _scheme.Keyword);
@@ -138,7 +138,7 @@ namespace MApplication
             AddToken(node.EndKeyword, _scheme.Keyword);
         }
 
-        public override void VisitMethodDefinition(MethodDefinitionSyntaxNode node)
+        public override void VisitConcreteMethodDeclaration(ConcreteMethodDeclarationSyntaxNode node)
         {
             AddToken(node.FunctionKeyword, _scheme.Keyword);
             Visit(node.OutputDescription);
@@ -221,7 +221,7 @@ namespace MApplication
             AddToken(node.ClosingBrace, _scheme.Bracket);
         }
 
-        public override void VisitIdentifierName(IdentifierNameSyntaxNode node)
+        public override void VisitIdentifierNameExpression(IdentifierNameExpressionSyntaxNode node)
         {
             AddToken(node.Name, _scheme.Identifier);
         }
@@ -253,12 +253,12 @@ namespace MApplication
             AddToken(node.EndKeyword, _scheme.ControlKeyword);
         }
 
-        public override void VisitUnquotedStringLiteral(UnquotedStringLiteralSyntaxNode node)
+        public override void VisitUnquotedStringLiteralExpression(UnquotedStringLiteralExpressionSyntaxNode node)
         {
             AddToken(node.StringToken, _scheme.UnquotedStringLiteral);
         }
 
-        public override void VisitStringLiteral(StringLiteralSyntaxNode node)
+        public override void VisitStringLiteralExpression(StringLiteralExpressionSyntaxNode node)
         {
             AddToken(node.StringToken, _scheme.StringLiteral);
         }
@@ -302,11 +302,11 @@ namespace MApplication
 
         public override void VisitCommandExpression(CommandExpressionSyntaxNode node)
         {
-            Visit(node.CommandName);
+            AddToken(node.CommandName, _scheme.Identifier);
             Visit(node.Arguments);
         }
 
-        public override void VisitNumberLiteral(NumberLiteralSyntaxNode node)
+        public override void VisitNumberLiteralExpression(NumberLiteralExpressionSyntaxNode node)
         {
             AddToken(node.Number, _scheme.NumberLiteral);
         }
@@ -317,13 +317,13 @@ namespace MApplication
             Visit(node.Operand);
         }
 
-        public override void VisitUnaryPostixOperationExpression(UnaryPostixOperationExpressionSyntaxNode node)
+        public override void VisitUnaryPostfixOperationExpression(UnaryPostfixOperationExpressionSyntaxNode node)
         {
             Visit(node.Operand);
             AddToken(node.Operation, _scheme.Operator);
         }
 
-        public override void VisitBaseClassInvokation(BaseClassInvokationSyntaxNode node)
+        public override void VisitClassInvokationExpression(ClassInvokationExpressionSyntaxNode node)
         {
             Visit(node.MethodName);
             AddToken(node.AtSign, _scheme.Operator);
@@ -338,7 +338,7 @@ namespace MApplication
 
         public override void VisitAttribute(AttributeSyntaxNode node)
         {
-            Visit(node.Name);
+            AddToken(node.Name, _scheme.Identifier);
             Visit(node.Assignment);
         }
 
@@ -357,12 +357,12 @@ namespace MApplication
             AddToken(node.ClosingBrace, _scheme.Bracket);
         }
 
-        public override void VisitCompoundName(CompoundNameSyntaxNode node)
+        public override void VisitCompoundNameExpression(CompoundNameExpressionSyntaxNode node)
         {
             Visit(node.Nodes);
         }
 
-        public override void VisitDoubleQuotedStringLiteral(DoubleQuotedStringLiteralSyntaxNode node)
+        public override void VisitDoubleQuotedStringLiteralExpression(DoubleQuotedStringLiteralExpressionSyntaxNode node)
         {
             AddToken(node.StringToken, _scheme.StringLiteral);
         }
@@ -401,7 +401,7 @@ namespace MApplication
 
         public override void VisitEnumerationItem(EnumerationItemSyntaxNode node)
         {
-            Visit(node.Name);
+            AddToken(node.Name, _scheme.Identifier);
             Visit(node.Values);
             Visit(node.Commas);
         }
@@ -419,27 +419,27 @@ namespace MApplication
             AddToken(node.AssignmentSign, _scheme.Operator);
         }
 
-        public override void VisitIndirectMemberAccess(IndirectMemberAccessSyntaxNode node)
+        public override void VisitIndirectMemberAccessExpression(IndirectMemberAccessExpressionSyntaxNode node)
         {
             AddToken(node.OpeningBracket, _scheme.Bracket);
             Visit(node.Expression);
             AddToken(node.ClosingBracket, _scheme.Bracket);
         }
 
-        public override void VisitLambda(LambdaSyntaxNode node)
+        public override void VisitLambdaExpression(LambdaExpressionSyntaxNode node)
         {
             AddToken(node.AtSign, _scheme.Operator);
             Visit(node.Input);
             Visit(node.Body);
         }
 
-        public override void VisitNamedFunctionHandle(NamedFunctionHandleSyntaxNode node)
+        public override void VisitNamedFunctionHandleExpression(NamedFunctionHandleExpressionSyntaxNode node)
         {
             AddToken(node.AtSign, _scheme.Operator);
             Visit(node.FunctionName);
         }
 
-        public override void VisitMemberAccess(MemberAccessSyntaxNode node)
+        public override void VisitMemberAccessExpression(MemberAccessExpressionSyntaxNode node)
         {
             Visit(node.LeftOperand);
             AddToken(node.Dot, _scheme.Operator);

Parser.Tests/MParserShould.cs

@@ -19,7 +19,7 @@ namespace Parser.Tests
             var text = "a = b";
             var sut = GetSut(text);
             var actual = sut.Parse();
-            var assignment = actual.Root.StatementList[0].AsNode();
+            var assignment = actual.Root.Body.Statements[0].AsNode();
             Assert.IsType<ExpressionStatementSyntaxNode>(assignment);
             if (assignment is null)
             {
@@ -35,7 +35,7 @@ namespace Parser.Tests
             var text = "2 + 3";
             var sut = GetSut(text);
             var actual = sut.Parse();
-            var statement = actual.Root.StatementList[0].AsNode();
+            var statement = actual.Root.Body.Statements[0].AsNode();
             Assert.IsType<ExpressionStatementSyntaxNode>(statement);
             if (statement is null)
             {
@@ -51,7 +51,7 @@ namespace Parser.Tests
             var text = "a = ";
             var sut = GetSut(text);
             var actual = sut.Parse();
-            var assignment = actual.Root.StatementList[0].AsNode();
+            var assignment = actual.Root.Body.Statements[0].AsNode();
             Assert.IsType<ExpressionStatementSyntaxNode>(assignment);
             if (assignment is null)
             {
@@ -77,7 +77,7 @@ namespace Parser.Tests
             var text = "2 + 3";
             var sut = GetSut(text);
             var actual = sut.Parse();
-            var statement = actual.Root.StatementList[0].AsNode() as ExpressionStatementSyntaxNode;
+            var statement = actual.Root.Body.Statements[0].AsNode() as ExpressionStatementSyntaxNode;
             var expression = statement!.Expression as BinaryOperationExpressionSyntaxNode;
             var lhs = expression!.Lhs;
             var operation = expression.Operation;

Parser/Binding/Binder.cs

@@ -0,0 +1,456 @@
+using Parser.Internal;
+using Parser.Lowering;
+using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+
+using static Parser.Binding.BoundNodeFactory;
+
+namespace Parser.Binding
+{
+    public class Binder
+    {
+        private readonly DiagnosticsBag _diagnostics = new DiagnosticsBag();
+
+        public static BoundProgram BindProgram(SyntaxTree syntaxTree)
+        {
+            var binder = new Binder();
+            var boundRoot = binder.BindRoot(syntaxTree.NullRoot);
+            var statements = ((BoundBlockStatement)boundRoot.File.Body).Statements;
+            var functionsBuilder = ImmutableDictionary.CreateBuilder<FunctionSymbol, LoweredFunction>();
+            var globalStatements = statements.Where(s => s.Kind != BoundNodeKind.FunctionDeclaration).ToArray();
+            var mainFunction = (FunctionSymbol?)null;
+            var scriptFunction = (FunctionSymbol?)null;
+            if (globalStatements.Length > 0)
+            {
+                // we have to gather all bound expression statements into a "script" function.
+                scriptFunction = new FunctionSymbol("%script");
+                var body = Block(globalStatements[0].Syntax, globalStatements);
+                var loweredBody = Lowerer.Lower(body);
+                var declaration = new BoundFunctionDeclaration(
+                    syntax: globalStatements[0].Syntax,
+                    name: "%script",
+                    inputDescription: ImmutableArray<ParameterSymbol>.Empty,
+                    outputDescription: ImmutableArray<ParameterSymbol>.Empty,
+                    body: body);
+                var loweredFunction = LowerFunction(declaration);
+                functionsBuilder.Add(scriptFunction, loweredFunction);
+            }
+
+            var functions = statements.OfType<BoundFunctionDeclaration>().ToArray();
+            var first = true;
+            foreach (var function in functions)
+            {
+                var functionSymbol = new FunctionSymbol(
+                    name: function.Name);
+                var loweredFunction = LowerFunction(function);
+                functionsBuilder.Add(functionSymbol, loweredFunction);
+                if (first && globalStatements.Length == 0)
+                {
+                    // the first function in a file will become "main".
+                    first = false;
+                    mainFunction = functionSymbol;
+                }
+            }
+
+            return new BoundProgram(
+                binder._diagnostics.ToImmutableArray(),
+                mainFunction,
+                scriptFunction,
+                functionsBuilder.ToImmutable());
+        }
+
+        private static LoweredFunction LowerFunction(BoundFunctionDeclaration declaration)
+        {
+            var loweredBody = Lowerer.Lower(declaration.Body);
+            return new LoweredFunction(
+                declaration: declaration,
+                name: declaration.Name,
+                inputDescription: declaration.InputDescription,
+                outputDescription: declaration.OutputDescription,
+                body: loweredBody);
+        }
+
+        private BoundRoot BindRoot(RootSyntaxNode node)
+        {
+            var boundFile = BindFile(node.File);
+            return Root(node, boundFile);
+        }
+
+        private BoundFile BindFile(FileSyntaxNode node)
+        {
+            var body = BindBlockStatement(node.Body);
+            return File(node, body);
+        }
+
+        private BoundStatement BindStatement(StatementSyntaxNode node)
+        {
+            return node.Kind switch
+            {
+                TokenKind.AbstractMethodDeclaration =>
+                    BindAbstractMethodDeclaration((AbstractMethodDeclarationSyntaxNode)node),
+                TokenKind.BlockStatement =>
+                    BindBlockStatement((BlockStatementSyntaxNode)node),
+                TokenKind.ClassDeclaration =>
+                    BindClassDeclaration((ClassDeclarationSyntaxNode)node),
+                TokenKind.ConcreteMethodDeclaration =>
+                    BindConcreteMethodDeclaration((ConcreteMethodDeclarationSyntaxNode)node),
+                TokenKind.EmptyStatement =>
+                    BindEmptyStatement((EmptyStatementSyntaxNode)node),
+                TokenKind.ExpressionStatement =>
+                    BindExpressionStatement((ExpressionStatementSyntaxNode)node),
+                TokenKind.ForStatement =>
+                    BindForStatement((ForStatementSyntaxNode)node),
+                TokenKind.FunctionDeclaration =>
+                    BindFunctionDeclaration((FunctionDeclarationSyntaxNode)node),
+                TokenKind.IfStatement =>
+                    BindIfStatement((IfStatementSyntaxNode)node),
+                TokenKind.SwitchStatement =>
+                    BindSwitchStatement((SwitchStatementSyntaxNode)node),
+                TokenKind.TryCatchStatement =>
+                    BindTryCatchStatement((TryCatchStatementSyntaxNode)node),
+                TokenKind.WhileStatement =>
+                    BindWhileStatement((WhileStatementSyntaxNode)node),
+                _ =>
+                    throw new Exception($"Invalid statement node kind '{node.Kind}'."),
+            };
+        }
+
+        private BoundWhileStatement BindWhileStatement(WhileStatementSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundTryCatchStatement BindTryCatchStatement(TryCatchStatementSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundSwitchStatement BindSwitchStatement(SwitchStatementSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundIfStatement BindIfStatement(IfStatementSyntaxNode node)
+        {
+            var condition = BindExpression(node.Condition);
+            var body = BindStatement(node.Body);
+            var elseifClauses = node.ElseifClauses
+                .Where(n => n.IsNode)
+                .Select(n => (ElseifClause)n.AsNode()!);
+            var builder = ImmutableArray.CreateBuilder<BoundElseifClause>();
+            foreach (var elseifClause in elseifClauses)
+            {
+                var clause = BindElseifClause(elseifClause);
+                builder.Add(clause);
+            }
+            var maybeElseClause = node.ElseClause switch
+            {
+                { } elseClause => BindElseClause(elseClause),
+                _ => null,
+            };
+
+            return IfStatement(node, condition, body, builder.ToImmutable(), maybeElseClause);
+        }
+
+        private BoundStatement BindElseClause(ElseClause node)
+        {
+            return BindStatement(node.Body);
+        }
+
+        private BoundBlockStatement BindBlockStatement(BlockStatementSyntaxNode node)
+        {
+            var boundStatements = BindStatementList(node.Statements);
+            return Block(node, boundStatements.ToArray());
+        }
+
+        private IEnumerable<BoundStatement> BindStatementList(SyntaxNodeOrTokenList list)
+        {
+            var statements = list.Where(s => s.IsNode).Select(s => (StatementSyntaxNode)s.AsNode()!);
+            foreach (var statement in statements)
+            {
+                yield return BindStatement(statement);
+            }
+        }
+
+        private ImmutableArray<BoundExpression> BindExpressionList(SyntaxNodeOrTokenList list)
+        {
+            var builder = ImmutableArray.CreateBuilder<BoundExpression>();
+            var expressions = list.Where(s => s.IsNode).Select(s => (ExpressionSyntaxNode)s.AsNode()!);
+            foreach (var expression in expressions)
+            {
+                var boundExpression = BindExpression(expression);
+                builder.Add(boundExpression);
+            }
+
+            return builder.ToImmutable();
+        }
+
+        private BoundElseifClause BindElseifClause(ElseifClause node)
+        {
+            var condition = BindExpression(node.Condition);
+            var body = BindStatement(node.Body);
+            return ElseifClause(node, condition, body);
+        }
+
+        private BoundFunctionDeclaration BindFunctionDeclaration(FunctionDeclarationSyntaxNode node)
+        {
+            var inputDescription = BindInputDescription(node.InputDescription);
+            var outputDescription = BindOutputDescription(node.OutputDescription);
+            var body = BindStatement(node.Body);
+            return new BoundFunctionDeclaration(node, node.Name.Text, inputDescription, outputDescription, body);
+        }
+
+        private ImmutableArray<ParameterSymbol> BindOutputDescription(FunctionOutputDescriptionSyntaxNode? node)
+        {
+            if (node is null)
+            {
+                return ImmutableArray<ParameterSymbol>.Empty;
+            }
+            var outputs = node.OutputList.Where(p => p.IsNode).Select(p => p.AsNode()!);
+            var builder = ImmutableArray.CreateBuilder<ParameterSymbol>();
+            foreach (var output in outputs)
+            {
+                if (output.Kind != TokenKind.IdentifierNameExpression)
+                {
+                    throw new Exception($"Invalid function output kind {output.Kind}.");
+                }
+
+                builder.Add(BindParameterSymbol((IdentifierNameExpressionSyntaxNode)output));
+            }
+
+            return builder.ToImmutable();
+        }
+
+        private ImmutableArray<ParameterSymbol> BindInputDescription(FunctionInputDescriptionSyntaxNode? node)
+        {
+            if (node is null)
+            {
+                return ImmutableArray<ParameterSymbol>.Empty;
+            }
+
+            var parameters = node.ParameterList.Where(p => p.IsNode).Select(p => p.AsNode()!);
+            var builder = ImmutableArray.CreateBuilder<ParameterSymbol>();
+            foreach (var parameter in parameters)
+            {
+                if (parameter.Kind != TokenKind.IdentifierNameExpression)
+                {
+                    throw new Exception($"Invalid function parameter kind {parameter.Kind}.");
+                }
+
+                builder.Add(BindParameterSymbol((IdentifierNameExpressionSyntaxNode)parameter));
+            }
+
+            return builder.ToImmutable();
+        }
+
+        private ParameterSymbol BindParameterSymbol(IdentifierNameExpressionSyntaxNode parameter)
+        {
+            return new ParameterSymbol(parameter.Text);
+        }
+
+        private BoundForStatement BindForStatement(ForStatementSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundExpressionStatement BindExpressionStatement(ExpressionStatementSyntaxNode node)
+        {
+            var expression = BindExpression(node.Expression);
+            return ExpressionStatement(node, expression);
+        }
+
+        private BoundExpression BindExpression(ExpressionSyntaxNode node)
+        {
+            return node.Kind switch
+            {
+                TokenKind.ArrayLiteralExpression =>
+                    BindArrayLiteralExpression((ArrayLiteralExpressionSyntaxNode)node),
+                TokenKind.AssignmentExpression =>
+                    BindAssignmentExpression((AssignmentExpressionSyntaxNode)node),
+                TokenKind.BinaryOperationExpression =>
+                    BindBinaryOperationExpression((BinaryOperationExpressionSyntaxNode)node),
+                TokenKind.CellArrayElementAccessExpression =>
+                    BindCellArrayElementAccessExpression((CellArrayElementAccessExpressionSyntaxNode)node),
+                TokenKind.CellArrayLiteralExpression =>
+                    BindCellArrayLiteralExpression((CellArrayLiteralExpressionSyntaxNode)node),
+                TokenKind.ClassInvokationExpression =>
+                    BindClassInvokationExpression((ClassInvokationExpressionSyntaxNode)node),
+                TokenKind.CommandExpression =>
+                    BindCommandExpression((CommandExpressionSyntaxNode)node),
+                TokenKind.CompoundNameExpression =>
+                    BindCompoundNameExpression((CompoundNameExpressionSyntaxNode)node),
+                TokenKind.DoubleQuotedStringLiteralExpression =>
+                    BindDoubleQuotedStringLiteralExpression((DoubleQuotedStringLiteralExpressionSyntaxNode)node),
+                TokenKind.EmptyExpression =>
+                    BindEmptyExpression((EmptyExpressionSyntaxNode)node),
+                TokenKind.FunctionCallExpression =>
+                    BindFunctionCallExpression((FunctionCallExpressionSyntaxNode)node),
+                TokenKind.IdentifierNameExpression =>
+                    BindIdentifierNameExpression((IdentifierNameExpressionSyntaxNode)node),
+                TokenKind.IndirectMemberAccessExpression =>
+                    BindIndirectMemberAccessExpression((IndirectMemberAccessExpressionSyntaxNode)node),
+                TokenKind.LambdaExpression =>
+                    BindLambdaExpression((LambdaExpressionSyntaxNode)node),
+                TokenKind.MemberAccessExpression =>
+                    BindMemberAccessExpression((MemberAccessExpressionSyntaxNode)node),
+                TokenKind.NamedFunctionHandleExpression =>
+                    BindNamedFunctionHandleExpression((NamedFunctionHandleExpressionSyntaxNode)node),
+                TokenKind.NumberLiteralExpression =>
+                    BindNumberLiteralExpression((NumberLiteralExpressionSyntaxNode)node),
+                TokenKind.ParenthesizedExpression =>
+                    BindParenthesizedExpression((ParenthesizedExpressionSyntaxNode)node),
+                TokenKind.StringLiteralExpression =>
+                    BindStringLiteralExpression((StringLiteralExpressionSyntaxNode)node),
+                TokenKind.UnaryPrefixOperationExpression =>
+                    BindUnaryPrefixOperationExpression((UnaryPrefixOperationExpressionSyntaxNode)node),
+                TokenKind.UnaryPostfixOperationExpression =>
+                    BindUnaryPostfixOperationExpression((UnaryPostfixOperationExpressionSyntaxNode)node),
+                TokenKind.UnquotedStringLiteralExpression =>
+                    BindUnquotedStringLiteralExpression((UnquotedStringLiteralExpressionSyntaxNode)node),
+                _ =>
+                    throw new Exception($"Invalid statement node kind '{node.Kind}'."),
+            };
+        }
+
+        private BoundArrayLiteralExpression BindArrayLiteralExpression(ArrayLiteralExpressionSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundAssignmentExpression BindAssignmentExpression(AssignmentExpressionSyntaxNode node)
+        {
+            var left = BindExpression(node.Lhs);
+            var right = BindExpression(node.Rhs);
+            return Assignment(node, left, right);
+        }
+
+        private BoundBinaryOperationExpression BindBinaryOperationExpression(BinaryOperationExpressionSyntaxNode node)
+        {
+            var left = BindExpression(node.Lhs);
+            var right = BindExpression(node.Rhs);
+            return BinaryOperation(node, left, node.Operation.Kind, right);
+        }
+
+        private BoundCellArrayElementAccessExpression BindCellArrayElementAccessExpression(CellArrayElementAccessExpressionSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundCellArrayLiteralExpression BindCellArrayLiteralExpression(CellArrayLiteralExpressionSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundClassInvokationExpression BindClassInvokationExpression(ClassInvokationExpressionSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundCommandExpression BindCommandExpression(CommandExpressionSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundCompoundNameExpression BindCompoundNameExpression(CompoundNameExpressionSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundDoubleQuotedStringLiteralExpression BindDoubleQuotedStringLiteralExpression(DoubleQuotedStringLiteralExpressionSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundEmptyExpression BindEmptyExpression(EmptyExpressionSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundFunctionCallExpression BindFunctionCallExpression(FunctionCallExpressionSyntaxNode node)
+        {
+            var name = BindExpression(node.FunctionName);
+            var arguments = BindExpressionList(node.Nodes);
+            return FunctionCall(node, name, arguments);
+        }
+
+        private BoundIdentifierNameExpression BindIdentifierNameExpression(IdentifierNameExpressionSyntaxNode node)
+        {
+            return new BoundIdentifierNameExpression(node, node.Name.Text);
+        }
+
+        private BoundIndirectMemberAccessExpression BindIndirectMemberAccessExpression(IndirectMemberAccessExpressionSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundLambdaExpression BindLambdaExpression(LambdaExpressionSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundMemberAccessExpression BindMemberAccessExpression(MemberAccessExpressionSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundNamedFunctionHandleExpression BindNamedFunctionHandleExpression(NamedFunctionHandleExpressionSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundNumberLiteralExpression BindNumberLiteralExpression(NumberLiteralExpressionSyntaxNode node)
+        {
+            var value = (double)node.Number.Value!;
+            return NumberLiteral(node, value);
+        }
+
+        private BoundExpression BindParenthesizedExpression(ParenthesizedExpressionSyntaxNode node)
+        {
+            return BindExpression(node.Expression);
+        }
+
+        private BoundStringLiteralExpression BindStringLiteralExpression(StringLiteralExpressionSyntaxNode node)
+        {
+            var value = (string)node.StringToken.Value!;
+            return StringLiteral(node, value);
+        }
+
+        private BoundUnaryOperationExpression BindUnaryPrefixOperationExpression(UnaryPrefixOperationExpressionSyntaxNode node)
+        {
+            var operand = BindExpression(node.Operand);
+            return UnaryOperation(node, node.Operation.Kind, operand);
+        }
+
+        private BoundUnaryOperationExpression BindUnaryPostfixOperationExpression(UnaryPostfixOperationExpressionSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundUnquotedStringLiteralExpression BindUnquotedStringLiteralExpression(UnquotedStringLiteralExpressionSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundEmptyStatement BindEmptyStatement(EmptyStatementSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundConcreteMethodDeclaration BindConcreteMethodDeclaration(ConcreteMethodDeclarationSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundClassDeclaration BindClassDeclaration(ClassDeclarationSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private BoundAbstractMethodDeclaration BindAbstractMethodDeclaration(AbstractMethodDeclarationSyntaxNode node)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

Parser/Binding/BoundBinaryOperator.cs

@@ -0,0 +1,48 @@
+using System.Linq;
+
+namespace Parser.Binding
+{
+    public class BoundBinaryOperator
+    {
+        private static BoundBinaryOperator[] _operators =
+        {
+            new BoundBinaryOperator(TokenKind.EqualsToken, BoundBinaryOperatorKind.Equals),
+            new BoundBinaryOperator(TokenKind.PipePipeToken, BoundBinaryOperatorKind.PipePipe),
+            new BoundBinaryOperator(TokenKind.AmpersandAmpersandToken, BoundBinaryOperatorKind.AmpersandAmpersand),
+            new BoundBinaryOperator(TokenKind.PipeToken, BoundBinaryOperatorKind.Pipe),
+            new BoundBinaryOperator(TokenKind.AmpersandToken, BoundBinaryOperatorKind.Ampersand),
+            new BoundBinaryOperator(TokenKind.LessToken, BoundBinaryOperatorKind.Less),
+            new BoundBinaryOperator(TokenKind.LessOrEqualsToken, BoundBinaryOperatorKind.LessOrEquals),
+            new BoundBinaryOperator(TokenKind.GreaterToken, BoundBinaryOperatorKind.Greater),
+            new BoundBinaryOperator(TokenKind.GreaterOrEqualsToken, BoundBinaryOperatorKind.GreaterOrEquals),
+            new BoundBinaryOperator(TokenKind.EqualsEqualsToken, BoundBinaryOperatorKind.EqualsEquals),
+            new BoundBinaryOperator(TokenKind.TildeEqualsToken, BoundBinaryOperatorKind.TildeEquals),
+            new BoundBinaryOperator(TokenKind.ColonToken, BoundBinaryOperatorKind.Colon),
+            new BoundBinaryOperator(TokenKind.PlusToken, BoundBinaryOperatorKind.Plus),
+            new BoundBinaryOperator(TokenKind.MinusToken, BoundBinaryOperatorKind.Minus),
+            new BoundBinaryOperator(TokenKind.StarToken, BoundBinaryOperatorKind.Star),
+            new BoundBinaryOperator(TokenKind.DotStarToken, BoundBinaryOperatorKind.DotStar),
+            new BoundBinaryOperator(TokenKind.SlashToken, BoundBinaryOperatorKind.Slash),
+            new BoundBinaryOperator(TokenKind.DotSlashToken, BoundBinaryOperatorKind.DotSlash),
+            new BoundBinaryOperator(TokenKind.BackslashToken, BoundBinaryOperatorKind.Backslash),
+            new BoundBinaryOperator(TokenKind.DotBackslashToken, BoundBinaryOperatorKind.DotBackslash),
+            new BoundBinaryOperator(TokenKind.TildeToken, BoundBinaryOperatorKind.Tilde),
+            new BoundBinaryOperator(TokenKind.CaretToken, BoundBinaryOperatorKind.Caret),
+            new BoundBinaryOperator(TokenKind.DotCaretToken, BoundBinaryOperatorKind.DotCaret),
+        };
+
+        public BoundBinaryOperator(TokenKind syntaxKind, BoundBinaryOperatorKind kind)
+        {
+            SyntaxKind = syntaxKind;
+            Kind = kind;
+        }
+
+        public TokenKind SyntaxKind { get; }
+        public BoundBinaryOperatorKind Kind { get; }
+
+        internal static BoundBinaryOperator? GetOperator(TokenKind kind)
+        {
+            return _operators.FirstOrDefault(op => op.SyntaxKind == kind);
+        }
+    }
+}

Parser/Binding/BoundBinaryOperatorKind.cs

@@ -0,0 +1,29 @@
+namespace Parser.Binding
+{
+    public enum BoundBinaryOperatorKind
+    {
+        Equals,
+        PipePipe,
+        AmpersandAmpersand,
+        Pipe,
+        Ampersand,
+        Less,
+        LessOrEquals,
+        Greater,
+        GreaterOrEquals,
+        EqualsEquals,
+        TildeEquals,
+        Colon,
+        Plus,
+        Minus,
+        Star,
+        DotStar,
+        Slash,
+        DotSlash,
+        Backslash,
+        DotBackslash,
+        Tilde,
+        Caret,
+        DotCaret,
+    }
+}

Parser/Binding/BoundLabel.cs

@@ -0,0 +1,17 @@
+namespace Parser.Binding
+{
+    public class BoundLabel
+    {
+        public string Name { get; }
+
+        public BoundLabel(string name)
+        {
+            Name = name;
+        }
+
+        public override string ToString()
+        {
+            return Name;
+        }
+    }
+}

Parser/Binding/BoundNode.cs

@@ -0,0 +1,13 @@
+namespace Parser.Binding
+{
+    public abstract class BoundNode
+    {
+        public BoundNode(SyntaxNode syntax)
+        {
+            Syntax = syntax;
+        }
+
+        public SyntaxNode Syntax { get; }
+        public abstract BoundNodeKind Kind { get; }
+    }
+}

Parser/Binding/BoundNodeFactory.cs

@@ -0,0 +1,170 @@
+using System;
+using System.Collections.Immutable;
+
+namespace Parser.Binding
+{
+    public static class BoundNodeFactory
+    {
+        public static BoundRoot Root(SyntaxNode syntax, BoundFile file)
+        {
+            return new BoundRoot(syntax, file);
+        }
+
+        public static BoundFile File(SyntaxNode syntax, BoundStatement body)
+        {
+            return new BoundFile(syntax, body);
+        }
+
+        public static BoundBlockStatement Block(SyntaxNode syntax, params BoundStatement[] statements)
+        {
+            return new BoundBlockStatement(syntax, statements.ToImmutableArray());
+        }
+
+        public static BoundBlockStatement Block(SyntaxNode syntax, ImmutableArray<BoundStatement> statements)
+        {
+            return new BoundBlockStatement(syntax, statements);
+        }
+
+        public static BoundExpressionStatement ExpressionStatement(SyntaxNode syntax, BoundExpression expression)
+        {
+            return new BoundExpressionStatement(syntax, expression);
+        }
+
+        public static BoundIfStatement IfStatement(
+            SyntaxNode syntax,
+            BoundExpression condition,
+            BoundStatement body,
+            ImmutableArray<BoundElseifClause> elseifClauses,
+            BoundStatement? elseClause)
+        {
+            return new BoundIfStatement(syntax, condition, body, elseifClauses, elseClause);
+        }
+
+        public static BoundLabelStatement LabelStatement(
+            SyntaxNode syntax,
+            BoundLabel label)
+        {
+            return new BoundLabelStatement(syntax, label);
+        }
+
+        public static BoundAssignmentExpression Assignment(
+            SyntaxNode syntax,
+            BoundExpression left,
+            BoundExpression right)
+        {
+            return new BoundAssignmentExpression(syntax, left, right);
+        }
+
+        public static BoundBinaryOperationExpression BinaryOperation(
+            SyntaxNode syntax,
+            BoundExpression left,
+            TokenKind kind,
+            BoundExpression right)
+        {
+            var op = BindBinaryOperator(kind);
+            return new BoundBinaryOperationExpression(syntax, left, op, right);
+        }
+
+        public static BoundConditionalGotoStatement ConditionalGoto(
+            SyntaxNode syntax,
+            BoundExpression condition,
+            BoundLabel label,
+            bool gotoIfTrue)
+        {
+            return new BoundConditionalGotoStatement(
+                syntax,
+                condition,
+                label,
+                gotoIfTrue);
+        }
+
+        public static BoundConditionalGotoStatement GotoIfTrue(
+            SyntaxNode syntax,
+            BoundExpression condition,
+            BoundLabel label)
+        {
+            return new BoundConditionalGotoStatement(
+                syntax,
+                condition,
+                label,
+                gotoIfTrue: true);
+        }
+
+        public static BoundConditionalGotoStatement GotoIfFalse(
+            SyntaxNode syntax,
+            BoundExpression condition,
+            BoundLabel label)
+        {
+            return new BoundConditionalGotoStatement(
+                syntax,
+                condition,
+                label,
+                gotoIfTrue: false);
+        }
+
+        public static BoundFunctionCallExpression FunctionCall(
+            SyntaxNode syntax,
+            BoundExpression name,
+            ImmutableArray<BoundExpression> arguments)
+        {
+            return new BoundFunctionCallExpression(syntax, name, arguments);
+        }
+
+        public static BoundGotoStatement Goto(
+            SyntaxNode syntax,
+            BoundLabel label)
+        {
+            return new BoundGotoStatement(syntax, label);
+        }
+
+        public static BoundIdentifierNameExpression Identifier(
+            SyntaxNode syntax,
+            string name)
+        {
+            return new BoundIdentifierNameExpression(syntax, name);
+        }
+
+        public static BoundNumberLiteralExpression NumberLiteral(
+            SyntaxNode syntax,
+            double value)
+        {
+            return new BoundNumberLiteralExpression(syntax, value);
+        }
+
+        public static BoundStringLiteralExpression StringLiteral(
+            SyntaxNode syntax,
+            string value)
+        {
+            return new BoundStringLiteralExpression(syntax, value);
+        }
+
+        public static BoundElseifClause ElseifClause(
+            SyntaxNode syntax,
+            BoundExpression condition,
+            BoundStatement body)
+        {
+            return new BoundElseifClause(syntax, condition, body);
+        }
+
+        public static BoundUnaryOperationExpression UnaryOperation(
+            SyntaxNode syntax,
+            TokenKind kind,
+            BoundExpression operand)
+        {
+            var op = BindUnaryOperator(kind);
+            return new BoundUnaryOperationExpression(syntax, op, operand);
+        }
+
+        private static BoundUnaryOperator BindUnaryOperator(TokenKind kind)
+        {
+            return BoundUnaryOperator.GetOperator(kind)
+                ?? throw new Exception($"Unexpected unary operator kind {kind}.");
+        }
+
+        private static BoundBinaryOperator BindBinaryOperator(TokenKind kind)
+        {
+            return BoundBinaryOperator.GetOperator(kind)
+                ?? throw new Exception($"Unexpected binary operator kind {kind}.");
+        }
+    }
+}

Parser/Binding/BoundNodeKind.cs

@@ -0,0 +1,54 @@
+namespace Parser.Binding
+{
+    public enum BoundNodeKind
+    {
+        Root,
+        File,
+
+        // Statements
+        
+        AbstractMethodDeclaration,
+        BlockStatement,
+        ClassDeclaration,
+        ConcreteMethodDeclaration,
+        ConditionalGotoStatement,
+        EmptyStatement,
+        ExpressionStatement,
+        ForStatement,
+        FunctionDeclaration,
+        GotoStatement,
+        IfStatement,
+        LabelStatement,
+        SwitchStatement,
+        TryCatchStatement,
+        WhileStatement,
+
+        // Expressions
+        
+        ArrayLiteralExpression,
+        AssignmentExpression,
+        BinaryOperationExpression,
+        CellArrayElementAccessExpression,
+        CellArrayLiteralExpression,
+        ClassInvokationExpression,
+        CommandExpression,
+        CompoundNameExpression,
+        DoubleQuotedStringLiteralExpression,
+        EmptyExpression,
+        FunctionCallExpression,
+        IdentifierNameExpression,
+        IndirectMemberAccessExpression,
+        LambdaExpression,
+        MemberAccessExpression,
+        NamedFunctionHandleExpression,
+        NumberLiteralExpression,
+        ParenthesizedExpression,
+        StringLiteralExpression,
+        UnaryOperationExpression,
+        UnquotedStringLiteralExpression,
+
+        // Parts
+        ElseIfClause,
+        ElseClause
+    }
+}

Parser/Binding/BoundProgram.cs

@@ -0,0 +1,37 @@
+using Parser.Internal;
+using System.Collections.Immutable;
+
+namespace Parser.Binding
+{
+    public class BoundProgram
+    {
+        public BoundProgram(
+            ImmutableArray<Diagnostic> diagnostics,
+            FunctionSymbol? mainFunction,
+            FunctionSymbol? scriptFunction,
+            ImmutableDictionary<FunctionSymbol, LoweredFunction> functions)
+        {
+            Diagnostics = diagnostics;
+            MainFunction = mainFunction;
+            ScriptFunction = scriptFunction;
+            Functions = functions;
+        }
+
+        public ImmutableArray<Diagnostic> Diagnostics { get; }
+
+        /// <summary>
+        /// A "main" function (first in a file without any global statements).
+        /// </summary>
+        public FunctionSymbol? MainFunction { get; }
+
+        /// <summary>
+        /// A "script" function (generated from all global statements in a file if there are any).
+        /// </summary>
+        public FunctionSymbol? ScriptFunction { get; }
+
+        /// <summary>
+        /// So-called "local" functions.
+        /// </summary>
+        public ImmutableDictionary<FunctionSymbol, LoweredFunction> Functions { get; }
+    }
+}

Parser/Binding/BoundRoot.cs

@@ -0,0 +1,499 @@
+using System.Collections.Immutable;
+
+namespace Parser.Binding
+{
+    public class BoundRoot : BoundNode
+    {
+        public BoundRoot(SyntaxNode syntax, BoundFile file)
+            : base(syntax)
+        {
+            File = file;
+        }
+
+        public BoundFile File { get; }
+
+        public override BoundNodeKind Kind => BoundNodeKind.Root;
+    }
+
+    public class BoundFile : BoundNode
+    {
+        public BoundFile(SyntaxNode syntax, BoundStatement body)
+            : base(syntax)
+        {
+            Body = body;
+        }
+
+        public BoundStatement Body { get; }
+
+        public override BoundNodeKind Kind => BoundNodeKind.File;
+    }
+
+    public abstract class BoundStatement : BoundNode
+    {
+        public BoundStatement(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+    }
+
+    public abstract class BoundMethodDeclaration : BoundStatement
+    {
+        public BoundMethodDeclaration(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+    }
+
+    public class BoundAbstractMethodDeclaration : BoundMethodDeclaration
+    {
+        public BoundAbstractMethodDeclaration(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.AbstractMethodDeclaration;
+    }
+
+    public class BoundBlockStatement : BoundStatement
+    {
+        public BoundBlockStatement(SyntaxNode syntax, ImmutableArray<BoundStatement> statements)
+            : base(syntax)
+        {
+            Statements = statements;
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.BlockStatement;
+
+        public ImmutableArray<BoundStatement> Statements { get; }
+    }
+
+    public class BoundClassDeclaration : BoundStatement
+    {
+        public BoundClassDeclaration(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.ClassDeclaration;
+    }
+
+    public class BoundConcreteMethodDeclaration : BoundMethodDeclaration
+    {
+        public BoundConcreteMethodDeclaration(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.ConcreteMethodDeclaration;
+    }
+
+    public class BoundConditionalGotoStatement : BoundStatement
+    {
+        public BoundConditionalGotoStatement(SyntaxNode syntax, BoundExpression condition, BoundLabel label, bool gotoIfTrue = true)
+            : base(syntax)
+        {
+            Condition = condition;
+            Label = label;
+            GotoIfTrue = gotoIfTrue;
+        }
+
+        public BoundExpression Condition { get; }
+
+        public BoundLabel Label { get; }
+
+        public bool GotoIfTrue { get; }
+
+        public override BoundNodeKind Kind => BoundNodeKind.ConditionalGotoStatement;
+    }
+
+    public class BoundEmptyStatement : BoundStatement
+    {
+        public BoundEmptyStatement(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.EmptyStatement;
+    }
+
+    public class BoundExpressionStatement : BoundStatement
+    {
+        public BoundExpression Expression { get; }
+
+        public override BoundNodeKind Kind => BoundNodeKind.ExpressionStatement;
+
+        public BoundExpressionStatement(SyntaxNode syntax, BoundExpression expression)
+            : base(syntax)
+        {
+            Expression = expression;
+        }
+    }
+
+    public class BoundForStatement : BoundStatement
+    {
+        public BoundForStatement(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.ForStatement;
+    }
+
+    public class BoundFunctionDeclaration : BoundStatement
+    {
+        public BoundFunctionDeclaration(SyntaxNode syntax, string name, ImmutableArray<ParameterSymbol> inputDescription, ImmutableArray<ParameterSymbol> outputDescription, BoundStatement body)
+            : base(syntax)
+        {
+            Name = name;
+            InputDescription = inputDescription;
+            OutputDescription = outputDescription;
+            Body = body;
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.FunctionDeclaration;
+
+        public string Name { get; }
+        public ImmutableArray<ParameterSymbol> InputDescription { get; }
+        public ImmutableArray<ParameterSymbol> OutputDescription { get; }
+        public BoundStatement Body { get; }
+
+        public BoundFunctionDeclaration WithBody(BoundStatement body)
+        {
+            if (body == Body)
+            {
+                return this;
+            }
+
+            return new BoundFunctionDeclaration(
+                Syntax,
+                Name,
+                InputDescription,
+                OutputDescription,
+                body);
+        }
+    }
+
+    public class BoundGotoStatement : BoundStatement
+    {
+        public BoundGotoStatement(SyntaxNode syntax, BoundLabel label)
+            : base(syntax)
+        {
+            Label = label;
+        }
+
+        public BoundLabel Label { get; }
+
+        public override BoundNodeKind Kind => BoundNodeKind.GotoStatement;
+    }
+
+    public class BoundIfStatement : BoundStatement
+    {
+        public BoundIfStatement(SyntaxNode syntax, BoundExpression condition, BoundStatement body, ImmutableArray<BoundElseifClause> elseifClauses, BoundStatement? elseClause)
+            : base(syntax)
+        {
+            Condition = condition;
+            Body = body;
+            ElseifClauses = elseifClauses;
+            ElseClause = elseClause;
+        }
+
+        public BoundExpression Condition { get; }
+        public BoundStatement Body { get; }
+        public ImmutableArray<BoundElseifClause> ElseifClauses { get; }
+        public BoundStatement? ElseClause { get; }
+
+        public override BoundNodeKind Kind => BoundNodeKind.IfStatement;
+    }
+
+    public class BoundLabelStatement : BoundStatement
+    {
+        public BoundLabelStatement(SyntaxNode syntax, BoundLabel label)
+            : base(syntax)
+        {
+            Label = label;
+        }
+
+        public BoundLabel Label { get; }
+
+        public override BoundNodeKind Kind => BoundNodeKind.LabelStatement;
+    }
+
+    public class BoundSwitchStatement : BoundStatement
+    {
+        public BoundSwitchStatement(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.SwitchStatement;
+    }
+
+    public class BoundTryCatchStatement : BoundStatement
+    {
+        public BoundTryCatchStatement(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.TryCatchStatement;
+    }
+
+    public class BoundWhileStatement : BoundStatement
+    {
+        public BoundWhileStatement(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.WhileStatement;
+    }
+
+    public abstract class BoundExpression : BoundNode
+    {
+        public BoundExpression(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+    }
+
+    public class BoundArrayLiteralExpression : BoundExpression
+    {
+        public BoundArrayLiteralExpression(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.ArrayLiteralExpression;
+    }
+
+    public class BoundAssignmentExpression : BoundExpression
+    {
+        public BoundAssignmentExpression(SyntaxNode syntax, BoundExpression left, BoundExpression right)
+            : base(syntax)
+        {
+            Left = left;
+            Right = right;
+        }
+
+        public BoundExpression Left { get; }
+        public BoundExpression Right { get; }
+
+        public override BoundNodeKind Kind => BoundNodeKind.AssignmentExpression;
+    }
+
+    public class BoundBinaryOperationExpression : BoundExpression
+    {
+        public BoundBinaryOperationExpression(SyntaxNode syntax, BoundExpression left, BoundBinaryOperator op, BoundExpression right)
+            : base(syntax)
+        {
+            Left = left;
+            Op = op;
+            Right = right;
+        }
+
+        public BoundExpression Left { get; }
+        public BoundBinaryOperator Op { get; }
+        public BoundExpression Right { get; }
+
+        public override BoundNodeKind Kind => BoundNodeKind.BinaryOperationExpression;
+    }
+
+    public class BoundCellArrayElementAccessExpression : BoundExpression
+    {
+        public BoundCellArrayElementAccessExpression(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.CellArrayElementAccessExpression;
+    }
+
+    public class BoundCellArrayLiteralExpression : BoundExpression
+    {
+        public BoundCellArrayLiteralExpression(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.CellArrayLiteralExpression;
+    }
+
+    public class BoundClassInvokationExpression : BoundExpression
+    {
+        public BoundClassInvokationExpression(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.ClassInvokationExpression;
+    }
+
+    public class BoundCommandExpression : BoundExpression
+    {
+        public BoundCommandExpression(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.CommandExpression;
+    }
+
+    public class BoundCompoundNameExpression : BoundExpression
+    {
+        public BoundCompoundNameExpression(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.CompoundNameExpression;
+    }
+
+    public class BoundDoubleQuotedStringLiteralExpression : BoundExpression
+    {
+        public BoundDoubleQuotedStringLiteralExpression(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.DoubleQuotedStringLiteralExpression;
+    }
+
+    public class BoundEmptyExpression : BoundExpression
+    {
+        public BoundEmptyExpression(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.EmptyExpression;
+    }
+
+    public class BoundFunctionCallExpression : BoundExpression
+    {
+        public BoundFunctionCallExpression(SyntaxNode syntax, BoundExpression name, ImmutableArray<BoundExpression> arguments)
+            : base(syntax)
+        {
+            Name = name;
+            Arguments = arguments;
+        }
+
+        public BoundExpression Name { get; }
+        public ImmutableArray<BoundExpression> Arguments { get; }
+        public override BoundNodeKind Kind => BoundNodeKind.FunctionCallExpression;
+    }
+
+    public class BoundIdentifierNameExpression : BoundExpression
+    {
+        public BoundIdentifierNameExpression(SyntaxNode syntax, string name)
+            : base(syntax)
+        {
+            Name = name;
+        }
+
+        public string Name { get; }
+        public override BoundNodeKind Kind => BoundNodeKind.IdentifierNameExpression;
+    }
+
+    public class BoundIndirectMemberAccessExpression : BoundExpression
+    {
+        public BoundIndirectMemberAccessExpression(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.IndirectMemberAccessExpression;
+    }
+
+    public class BoundLambdaExpression : BoundExpression
+    {
+        public BoundLambdaExpression(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.LambdaExpression;
+    }
+
+    public class BoundMemberAccessExpression : BoundExpression
+    {
+        public BoundMemberAccessExpression(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.MemberAccessExpression;
+    }
+
+    public class BoundNamedFunctionHandleExpression : BoundExpression
+    {
+        public BoundNamedFunctionHandleExpression(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.NamedFunctionHandleExpression;
+    }
+
+    public class BoundNumberLiteralExpression : BoundExpression
+    {
+        public BoundNumberLiteralExpression(SyntaxNode syntax, double value)
+            : base(syntax)
+        {
+            Value = value;
+        }
+
+        public double Value { get; }
+        public override BoundNodeKind Kind => BoundNodeKind.NumberLiteralExpression;
+    }
+
+    public class BoundStringLiteralExpression : BoundExpression
+    {
+        public BoundStringLiteralExpression(SyntaxNode syntax, string value)
+            : base(syntax)
+        {
+            Value = value;
+        }
+
+        public string Value { get; }
+        public override BoundNodeKind Kind => BoundNodeKind.StringLiteralExpression;
+    }
+
+    public class BoundUnaryOperationExpression : BoundExpression
+    {
+        public BoundUnaryOperationExpression(SyntaxNode syntax, BoundUnaryOperator op, BoundExpression operand)
+            : base(syntax)
+        {
+            Op = op;
+            Operand = operand;
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.UnaryOperationExpression;
+
+        public BoundUnaryOperator Op { get; }
+        public BoundExpression Operand { get; }
+    }
+
+    public class BoundUnquotedStringLiteralExpression : BoundExpression
+    {
+        public BoundUnquotedStringLiteralExpression(SyntaxNode syntax)
+            : base(syntax)
+        {
+        }
+
+        public override BoundNodeKind Kind => BoundNodeKind.UnquotedStringLiteralExpression;
+    }
+
+    public class BoundElseifClause : BoundNode
+    {
+        public BoundElseifClause(SyntaxNode syntax, BoundExpression condition, BoundStatement body)
+            : base(syntax)
+        {
+            Condition = condition;
+            Body = body;
+        }
+
+        public BoundExpression Condition { get; }
+        public BoundStatement Body { get; }
+        public override BoundNodeKind Kind => BoundNodeKind.ElseIfClause;
+    }
+}

Parser/Binding/BoundTreeRewriter.cs

@@ -0,0 +1,393 @@
+using System;
+using System.Collections.Immutable;
+using static Parser.Binding.BoundNodeFactory;
+
+namespace Parser.Binding
+{
+    public abstract class BoundTreeRewriter
+    {
+        public virtual BoundStatement RewriteStatement(BoundStatement node)
+        {
+            return node.Kind switch
+            {
+                BoundNodeKind.AbstractMethodDeclaration =>
+                    RewriteAbstractMethodDeclaration((BoundAbstractMethodDeclaration)node),
+                BoundNodeKind.BlockStatement =>
+                    RewriteBlockStatement((BoundBlockStatement)node),
+                BoundNodeKind.ClassDeclaration =>
+                    RewriteClassDeclaration((BoundClassDeclaration)node),
+                BoundNodeKind.ConcreteMethodDeclaration =>
+                    RewriteConcreteMethodDeclaration((BoundConcreteMethodDeclaration)node),
+                BoundNodeKind.ConditionalGotoStatement =>
+                    RewriteConditionalGotoStatement((BoundConditionalGotoStatement)node),
+                BoundNodeKind.EmptyStatement =>
+                    RewriteEmptyStatement((BoundEmptyStatement)node),
+                BoundNodeKind.ExpressionStatement =>
+                    RewriteExpressionStatement((BoundExpressionStatement)node),
+                BoundNodeKind.ForStatement =>
+                    RewriteForStatement((BoundForStatement)node),
+                BoundNodeKind.FunctionDeclaration =>
+                    RewriteFunctionDeclaration((BoundFunctionDeclaration)node),
+                BoundNodeKind.GotoStatement =>
+                    RewriteGotoStatement((BoundGotoStatement)node),
+                BoundNodeKind.IfStatement =>
+                    RewriteIfStatement((BoundIfStatement)node),
+                BoundNodeKind.LabelStatement =>
+                    RewriteLabelStatement((BoundLabelStatement)node),
+                BoundNodeKind.SwitchStatement =>
+                    RewriteSwitchStatement((BoundSwitchStatement)node),
+                BoundNodeKind.TryCatchStatement =>
+                    RewriteTryCatchStatement((BoundTryCatchStatement)node),
+                BoundNodeKind.WhileStatement =>
+                    RewriteWhileStatement((BoundWhileStatement)node),
+                _ =>
+                    throw new Exception($"Invalid statement kind {node.Kind}."),
+            };
+        }
+
+        public virtual BoundStatement RewriteGotoStatement(BoundGotoStatement node)
+        {
+            return node;
+        }
+
+        public virtual BoundStatement RewriteConditionalGotoStatement(BoundConditionalGotoStatement node)
+        {
+            var condition = RewriteExpression(node.Condition);
+            if (condition == node.Condition)
+            {
+                return node;
+            }
+
+            return ConditionalGoto(node.Syntax, condition, node.Label, node.GotoIfTrue);
+        }
+
+        public virtual BoundStatement RewriteWhileStatement(BoundWhileStatement node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundStatement RewriteTryCatchStatement(BoundTryCatchStatement node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundStatement RewriteSwitchStatement(BoundSwitchStatement node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundStatement RewriteLabelStatement(BoundLabelStatement node)
+        {
+            return node;
+        }
+
+        public virtual BoundStatement RewriteIfStatement(BoundIfStatement node)
+        {
+            var condition = RewriteExpression(node.Condition);
+            var body = RewriteStatement(node.Body);
+            ImmutableArray<BoundElseifClause>.Builder? builder = null;
+            for (var i = 0; i < node.ElseifClauses.Length; i++)
+            {
+                var oldClause = node.ElseifClauses[i];
+                var newClause = RewriteElseifClause(oldClause);
+                if (oldClause != newClause && builder is null)
+                {
+                    builder = ImmutableArray.CreateBuilder<BoundElseifClause>(node.ElseifClauses.Length);
+                    for (var j = 0; j < i; j++)
+                    {
+                        builder.Add(node.ElseifClauses[j]);
+                    }
+                }
+                if (builder is not null)
+                {
+                    builder.Add(newClause);
+                }
+            }
+
+            var elseIfClauses = builder is null ? node.ElseifClauses : builder.MoveToImmutable();
+            var elseClause = node.ElseClause is null ? null : RewriteStatement(node.ElseClause);
+            if (condition == node.Condition &&
+                body == node.Body &&
+                elseIfClauses == node.ElseifClauses &&
+                elseClause == node.ElseClause )
+            {
+                return node;
+            }
+
+            return IfStatement(node.Syntax, condition, body, elseIfClauses, elseClause);
+        }
+
+        public virtual BoundElseifClause RewriteElseifClause(BoundElseifClause node)
+        {
+            var condition = RewriteExpression(node.Condition);
+            var body = RewriteStatement(node.Body);
+            if (condition == node.Condition && body == node.Body)
+            {
+                return node;
+            }
+
+            return ElseifClause(node.Syntax, condition, body);
+        }
+
+        public virtual BoundStatement RewriteFunctionDeclaration(BoundFunctionDeclaration node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundStatement RewriteForStatement(BoundForStatement node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundStatement RewriteExpressionStatement(BoundExpressionStatement node)
+        {
+            var expression = RewriteExpression(node.Expression);
+            if (expression == node.Expression)
+            {
+                return node;
+            }
+
+            return ExpressionStatement(node.Syntax, expression);
+        }
+
+        public virtual BoundStatement RewriteEmptyStatement(BoundEmptyStatement node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundStatement RewriteConcreteMethodDeclaration(BoundConcreteMethodDeclaration node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundStatement RewriteClassDeclaration(BoundClassDeclaration node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundStatement RewriteBlockStatement(BoundBlockStatement node)
+        {
+            ImmutableArray<BoundStatement>.Builder? builder = null;
+            for (var i = 0; i < node.Statements.Length; i++)
+            {
+                var oldStatement = node.Statements[i];
+                var newStatement = RewriteStatement(oldStatement);
+                if (oldStatement != newStatement && builder is null)
+                {
+                    builder = ImmutableArray.CreateBuilder<BoundStatement>(node.Statements.Length);
+                    for (var j = 0; j < i; j++)
+                    {
+                        builder.Add(node.Statements[j]);
+                    }
+                }
+                if (builder is not null)
+                {
+                    builder.Add(newStatement);
+                }
+
+            }
+
+            if (builder is null)
+            {
+                return node;
+            }
+
+            return Block(node.Syntax, builder.MoveToImmutable());
+        }
+
+        public virtual BoundStatement RewriteAbstractMethodDeclaration(BoundAbstractMethodDeclaration node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundExpression RewriteExpression(BoundExpression node)
+        {
+            return node.Kind switch
+            {
+                BoundNodeKind.ArrayLiteralExpression =>
+                    RewriteArrayLiteralExpression((BoundArrayLiteralExpression)node),
+                BoundNodeKind.AssignmentExpression =>
+                    RewriteAssignmentExpression((BoundAssignmentExpression)node),
+                BoundNodeKind.BinaryOperationExpression =>
+                    RewriteBinaryOperationExpression((BoundBinaryOperationExpression)node),
+                BoundNodeKind.CellArrayElementAccessExpression =>
+                    RewriteCellArrayElementAccessExpression((BoundCellArrayElementAccessExpression)node),
+                BoundNodeKind.CellArrayLiteralExpression =>
+                    RewriteCellArrayLiteralExpression((BoundCellArrayLiteralExpression)node),
+                BoundNodeKind.ClassInvokationExpression =>
+                    RewriteClassInvokationExpression((BoundClassInvokationExpression)node),
+                BoundNodeKind.CommandExpression =>
+                    RewriteCommandExpression((BoundCommandExpression)node),
+                BoundNodeKind.CompoundNameExpression =>
+                    RewriteCompoundNameExpression((BoundCompoundNameExpression)node),
+                BoundNodeKind.DoubleQuotedStringLiteralExpression =>
+                    RewriteDoubleQuotedStringLiteralExpression((BoundDoubleQuotedStringLiteralExpression)node),
+                BoundNodeKind.EmptyExpression =>
+                    RewriteEmptyExpression((BoundEmptyExpression)node),
+                BoundNodeKind.FunctionCallExpression =>
+                    RewriteFunctionCallExpression((BoundFunctionCallExpression)node),
+                BoundNodeKind.IdentifierNameExpression =>
+                    RewriteIdentifierNameExpression((BoundIdentifierNameExpression)node),
+                BoundNodeKind.IndirectMemberAccessExpression =>
+                    RewriteIndirectMemberAccessExpression((BoundIndirectMemberAccessExpression)node),
+                BoundNodeKind.LambdaExpression =>
+                    RewriteLambdaExpression((BoundLambdaExpression)node),
+                BoundNodeKind.MemberAccessExpression =>
+                    RewriteMemberAccessExpression((BoundMemberAccessExpression)node),
+                BoundNodeKind.NamedFunctionHandleExpression =>
+                    RewriteNamedFunctionHandleExpression((BoundNamedFunctionHandleExpression)node),
+                BoundNodeKind.NumberLiteralExpression =>
+                    RewriteNumberLiteralExpression((BoundNumberLiteralExpression)node),
+                BoundNodeKind.StringLiteralExpression =>
+                    RewriteStringLiteralExpression((BoundStringLiteralExpression)node),
+                BoundNodeKind.UnaryOperationExpression =>
+                    RewriteUnaryOperationExpression((BoundUnaryOperationExpression)node),
+                BoundNodeKind.UnquotedStringLiteralExpression =>
+                    RewriteUnquotedStringLiteralExpression((BoundUnquotedStringLiteralExpression)node),
+                _ =>
+                    throw new Exception($"Invalid expression kind {node.Kind}."),
+            };
+        }
+
+        public virtual BoundExpression RewriteUnquotedStringLiteralExpression(BoundUnquotedStringLiteralExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundExpression RewriteUnaryOperationExpression(BoundUnaryOperationExpression node)
+        {
+            var operand = RewriteExpression(node.Operand);
+            return new BoundUnaryOperationExpression(node.Syntax, node.Op, operand);
+        }
+
+        public virtual BoundExpression RewriteStringLiteralExpression(BoundStringLiteralExpression node)
+        {
+            return node;
+        }
+
+        public virtual BoundExpression RewriteNumberLiteralExpression(BoundNumberLiteralExpression node)
+        {
+            return node;
+        }
+
+        public virtual BoundExpression RewriteNamedFunctionHandleExpression(BoundNamedFunctionHandleExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundExpression RewriteMemberAccessExpression(BoundMemberAccessExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundExpression RewriteLambdaExpression(BoundLambdaExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundExpression RewriteIndirectMemberAccessExpression(BoundIndirectMemberAccessExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundExpression RewriteIdentifierNameExpression(BoundIdentifierNameExpression node)
+        {
+            return node;
+        }
+
+        public virtual BoundExpression RewriteFunctionCallExpression(BoundFunctionCallExpression node)
+        {
+
+            ImmutableArray<BoundExpression>.Builder? builder = null;
+            for (var i = 0; i < node.Arguments.Length; i++)
+            {
+                var oldArgument = node.Arguments[i];
+                var newArgument = RewriteExpression(oldArgument);
+                if (oldArgument != newArgument && builder is null)
+                {
+                    builder = ImmutableArray.CreateBuilder<BoundExpression>(node.Arguments.Length);
+                    for (var j = 0; j < i; j++)
+                    {
+                        builder.Add(node.Arguments[j]);
+                    }
+                }
+                if (builder is not null)
+                {
+                    builder.Add(newArgument);
+                }
+
+            }
+
+            if (builder is null)
+            {
+                return node;
+            }
+
+            return FunctionCall(node.Syntax, node.Name, builder.MoveToImmutable());
+        }
+
+        public virtual BoundExpression RewriteEmptyExpression(BoundEmptyExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundExpression RewriteDoubleQuotedStringLiteralExpression(BoundDoubleQuotedStringLiteralExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundExpression RewriteCommandExpression(BoundCommandExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundExpression RewriteCompoundNameExpression(BoundCompoundNameExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundExpression RewriteClassInvokationExpression(BoundClassInvokationExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundExpression RewriteCellArrayLiteralExpression(BoundCellArrayLiteralExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundExpression RewriteCellArrayElementAccessExpression(BoundCellArrayElementAccessExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        public virtual BoundExpression RewriteBinaryOperationExpression(BoundBinaryOperationExpression node)
+        {
+            var left = RewriteExpression(node.Left);
+            var right = RewriteExpression(node.Right);
+            if (left == node.Left && right == node.Right)
+            {
+                return node;
+            }
+
+            return new BoundBinaryOperationExpression(node.Syntax, left, node.Op, right);
+        }
+
+        public virtual BoundExpression RewriteAssignmentExpression(BoundAssignmentExpression node)
+        {
+            var left = RewriteExpression(node.Left);
+            var right = RewriteExpression(node.Right);
+            if (left == node.Left && right == node.Right)
+            {
+                return node;
+            }
+
+            return Assignment(node.Syntax, left, right);
+        }
+
+        public virtual BoundExpression RewriteArrayLiteralExpression(BoundArrayLiteralExpression node)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

Parser/Binding/BoundUnaryOperator.cs

@@ -0,0 +1,26 @@
+using System.Linq;
+
+namespace Parser.Binding
+{
+    public class BoundUnaryOperator
+    {
+        private static BoundUnaryOperator[] _operators =
+        {
+            new BoundUnaryOperator(TokenKind.MinusToken, BoundUnaryOperatorKind.Minus),
+        };
+
+        public BoundUnaryOperator(TokenKind syntaxKind, BoundUnaryOperatorKind kind)
+        {
+            SyntaxKind = syntaxKind;
+            Kind = kind;
+        }
+
+        public TokenKind SyntaxKind { get; }
+        public BoundUnaryOperatorKind Kind { get; }
+
+        internal static BoundUnaryOperator? GetOperator(TokenKind kind)
+        {
+            return _operators.FirstOrDefault(op => op.SyntaxKind == kind);
+        }
+    }
+}

Parser/Binding/BoundUnaryOperatorKind.cs

@@ -0,0 +1,7 @@
+namespace Parser.Binding
+{
+    public enum BoundUnaryOperatorKind
+    {
+        Minus,
+    }
+}

Parser/Binding/FunctionSymbol.cs

@@ -0,0 +1,13 @@
+namespace Parser.Binding
+{
+    public class FunctionSymbol
+    {
+        public FunctionSymbol(
+            string name)
+        {
+            Name = name;
+        }
+
+        public string Name { get; }
+    }
+}

Parser/Binding/LoweredFunction.cs

@@ -0,0 +1,26 @@
+using System.Collections.Immutable;
+
+namespace Parser.Binding
+{
+    public class LoweredFunction {
+        public LoweredFunction(
+            BoundFunctionDeclaration declaration,
+            string name,
+            ImmutableArray<ParameterSymbol> inputDescription,
+            ImmutableArray<ParameterSymbol> outputDescription,
+            BoundBlockStatement body)
+        {
+            Declaration = declaration;
+            Name = name;
+            InputDescription = inputDescription;
+            OutputDescription = outputDescription;
+            Body = body;
+        }
+
+        public BoundFunctionDeclaration Declaration { get; }
+        public string Name { get; }
+        public ImmutableArray<ParameterSymbol> InputDescription { get; }
+        public ImmutableArray<ParameterSymbol> OutputDescription { get; }
+        public BoundBlockStatement Body { get; }
+    }
+}

Parser/Binding/ParameterSymbol.cs

@@ -0,0 +1,12 @@
+namespace Parser.Binding
+{
+    public class ParameterSymbol
+    {
+        public ParameterSymbol(string name)
+        {
+            Name = name;
+        }
+
+        public string Name { get; }
+    }
+}

Parser/Compilation.cs

@@ -0,0 +1,36 @@
+using Parser.Binding;
+
+namespace Parser
+{
+    public class Compilation
+    {
+        private readonly SyntaxTree _syntaxTree;
+
+        private Compilation(SyntaxTree syntaxTree)
+        {
+            _syntaxTree = syntaxTree;
+        }
+
+        public static Compilation Create(SyntaxTree syntaxTree)
+        {
+            return new Compilation(syntaxTree);
+        }
+
+        private BoundProgram GetBoundProgram()
+        {
+            return Binder.BindProgram(_syntaxTree);
+        }
+
+        public EvaluationResult Evaluate(CompilationContext context, bool inRepl)
+        {
+            var program = GetBoundProgram();
+            if (program.Diagnostics.Length > 0)
+            {
+                return new EvaluationResult(null, program.Diagnostics);
+            }
+
+            var evaluator = new Evaluator(program, context, inRepl);
+            return evaluator.Evaluate();
+        }
+    }
+}

Parser/CompilationContext.cs

@@ -0,0 +1,11 @@
+using Parser.Objects;
+using System.Collections.Generic;
+
+namespace Parser
+{
+    public class CompilationContext
+    {
+        public Dictionary<string, MObject> Variables { get; } = new Dictionary<string, MObject>();
+        public static CompilationContext Empty => new CompilationContext();
+    }
+}

Parser/EvaluationResult.cs

@@ -0,0 +1,19 @@
+using Parser.Internal;
+using Parser.Objects;
+using System.Collections.Immutable;
+
+namespace Parser
+{
+    public class EvaluationResult
+    {
+        public EvaluationResult(MObject? value, ImmutableArray<Diagnostic> diagnostics)
+        {
+            Value = value;
+            Diagnostics = diagnostics;
+        }
+
+        public MObject? Value { get; }
+
+        public ImmutableArray<Diagnostic> Diagnostics { get; }
+    }
+}

Parser/EvaluationScope.cs

@@ -0,0 +1,10 @@
+using Parser.Objects;
+using System.Collections.Generic;
+
+namespace Parser
+{
+    internal class EvaluationScope
+    {
+        public Dictionary<string, MObject> Variables { get; } = new Dictionary<string, MObject>();
+    }
+}

Parser/Evaluator.cs

@@ -0,0 +1,552 @@
+using Parser.Binding;
+using Parser.Internal;
+using Parser.MFunctions;
+using Parser.Objects;
+using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+
+namespace Parser
+{
+    internal class Evaluator
+    {
+        private readonly BoundProgram _program;
+        private readonly CompilationContext _context;
+        private readonly DiagnosticsBag _diagnostics = new DiagnosticsBag();
+        private bool _inRepl = false;
+        private readonly Stack<EvaluationScope> _scopeStack = new Stack<EvaluationScope>();
+        private readonly Dictionary<FunctionSymbol, LoweredFunction> _functions = new Dictionary<FunctionSymbol, LoweredFunction>();
+
+        public Evaluator(BoundProgram program, CompilationContext context, bool inRepl)
+        {
+            _program = program;
+            _context = context;
+            var outerScope = new EvaluationScope();
+            _scopeStack.Push(outerScope);
+            _inRepl = inRepl;
+            foreach (var pair in program.Functions)
+            {
+                _functions[pair.Key] = pair.Value;
+            }
+        }
+
+        internal EvaluationResult Evaluate()
+        {
+            if (_program.MainFunction is { } mainFunctionSymbol)
+            {
+                var mainFunction = _program.Functions[mainFunctionSymbol];
+                if (mainFunction.InputDescription.Length > 0)
+                {
+                    _diagnostics.ReportNotEnoughInputs(
+                        new TextSpan(mainFunction.Body.Syntax.Position, mainFunction.Body.Syntax.Position + mainFunction.Body.Syntax.FullWidth),
+                        mainFunction.Name);
+                return new EvaluationResult(null, _diagnostics.ToImmutableArray());
+                }
+                else
+                {
+                    var result = EvaluateBlockStatement(mainFunction.Body);
+                    return new EvaluationResult(result, _diagnostics.ToImmutableArray());
+                }
+            }
+            else if (_program.ScriptFunction is { } scriptFunctionSymbol)
+            {
+                var scriptFunction = _program.Functions[scriptFunctionSymbol];
+                var result = EvaluateBlockStatement(scriptFunction.Body);
+                return new EvaluationResult(result, _diagnostics.ToImmutableArray());
+            }
+            else
+            {
+                return new EvaluationResult(null, _diagnostics.ToImmutableArray());
+            }
+        }
+
+        private MObject? EvaluateFile(BoundFile root)
+        {
+            return EvaluateStatement(root.Body);
+        }
+
+        private MObject? EvaluateBlockStatement(BoundBlockStatement node)
+        {
+            var labelToIndex = new Dictionary<BoundLabel, int>();
+            for (var i = 0; i < node.Statements.Length; i++)
+            {
+                var statement = node.Statements[i];
+                if (statement.Kind == BoundNodeKind.LabelStatement)
+                {
+                    labelToIndex[((BoundLabelStatement)statement).Label] = i;
+                }
+            }
+
+            MObject? lastResult = null;
+            var index = 0;
+            while (index < node.Statements.Length)
+            {
+                var statement = node.Statements[index];
+                switch (statement.Kind)
+                {
+                    case BoundNodeKind.GotoStatement:
+                        var gs = (BoundGotoStatement)statement;
+                        index = labelToIndex[gs.Label];
+                        break;
+                    case BoundNodeKind.ConditionalGotoStatement:
+                        var cgs = (BoundConditionalGotoStatement)statement;
+                        var value = EvaluateExpression(cgs.Condition);
+                        var truth = IsTruthyValue(value);
+                        if ((cgs.GotoIfTrue && truth) ||
+                            (!cgs.GotoIfTrue && !truth))
+                        {
+                            index = labelToIndex[cgs.Label];
+                        }
+                        else
+                        {
+                            index++;
+                        }
+                        break;
+                    case BoundNodeKind.LabelStatement:
+                        index++;
+                        break;
+                    default:
+                        lastResult = EvaluateStatement(statement) ?? lastResult;
+                        index++;
+                        break;
+                }
+            }
+
+            return lastResult;
+        }
+
+        private bool IsTruthyValue(MObject? expression)
+        {
+            if (expression is MLogical { Value: true })
+            {
+                return true;
+            }
+
+            return false;
+        }
+
+        private MObject? EvaluateStatement(BoundStatement node)
+        {
+            return node.Kind switch
+            {
+                BoundNodeKind.AbstractMethodDeclaration =>
+                    EvaluateAbstractMethodDeclaration((BoundAbstractMethodDeclaration)node),
+                BoundNodeKind.BlockStatement =>
+                    EvaluateBlockStatement((BoundBlockStatement)node),
+                BoundNodeKind.ClassDeclaration =>
+                    EvaluateClassDeclaration((BoundClassDeclaration)node),
+                BoundNodeKind.EmptyStatement =>
+                    EvaluateEmptyStatement((BoundEmptyStatement)node),
+                BoundNodeKind.ExpressionStatement =>
+                    EvaluateExpressionStatement((BoundExpressionStatement)node),
+                BoundNodeKind.ForStatement =>
+                    EvaluateForStatement((BoundForStatement)node),
+                BoundNodeKind.FunctionDeclaration =>
+                    EvaluateFunctionDeclaration((BoundFunctionDeclaration)node),
+                BoundNodeKind.IfStatement =>
+                    EvaluateIfStatement((BoundIfStatement)node),
+                BoundNodeKind.ConcreteMethodDeclaration =>
+                    EvaluateMethodDefinition((BoundConcreteMethodDeclaration)node),
+                BoundNodeKind.SwitchStatement =>
+                    EvaluateSwitchStatement((BoundSwitchStatement)node),
+                BoundNodeKind.TryCatchStatement =>
+                    EvaluateTryCatchStatement((BoundTryCatchStatement)node),
+                BoundNodeKind.WhileStatement =>
+                    EvaluateWhileStatement((BoundWhileStatement)node),
+                _ => throw new NotImplementedException($"Invalid statement kind '{node.Kind}'."),
+            };
+        }
+
+        private MObject? EvaluateClassDeclaration(BoundClassDeclaration node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateEmptyStatement(BoundEmptyStatement node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateTryCatchStatement(BoundTryCatchStatement node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateForStatement(BoundForStatement node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateIfStatement(BoundIfStatement node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateWhileStatement(BoundWhileStatement node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateSwitchStatement(BoundSwitchStatement node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateFunctionDeclaration(BoundFunctionDeclaration node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateAbstractMethodDeclaration(BoundAbstractMethodDeclaration node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateMethodDefinition(BoundConcreteMethodDeclaration node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateExpressionStatement(BoundExpressionStatement node)
+        {
+            return EvaluateExpression(node.Expression);
+        }
+
+        private MObject? EvaluateExpression(BoundExpression node)
+        {
+            return node.Kind switch
+            {
+                BoundNodeKind.ArrayLiteralExpression =>
+                    EvaluateArrayLiteralExpression((BoundArrayLiteralExpression)node),
+                BoundNodeKind.AssignmentExpression =>
+                    EvaluateAssignmentExpression((BoundAssignmentExpression)node),
+                BoundNodeKind.BinaryOperationExpression =>
+                    EvaluateBinaryOperation((BoundBinaryOperationExpression)node),
+                BoundNodeKind.CellArrayElementAccessExpression =>
+                    EvaluateCellArrayElementAccess((BoundCellArrayElementAccessExpression)node),
+                BoundNodeKind.CellArrayLiteralExpression =>
+                    EvaluateCellArrayLiteralExpression((BoundCellArrayLiteralExpression)node),
+                BoundNodeKind.ClassInvokationExpression =>
+                    EvaluateClassInvokation((BoundClassInvokationExpression)node),
+                BoundNodeKind.CommandExpression =>
+                    EvaluateCommand((BoundCommandExpression)node),
+                BoundNodeKind.CompoundNameExpression =>
+                    EvaluateCompoundName((BoundCompoundNameExpression)node),
+                BoundNodeKind.DoubleQuotedStringLiteralExpression =>
+                    EvaluateDoubleQuotedStringLiteralExpression((BoundDoubleQuotedStringLiteralExpression)node),
+                BoundNodeKind.EmptyExpression =>
+                    EvaluateEmptyExpression((BoundEmptyExpression)node),
+                BoundNodeKind.FunctionCallExpression =>
+                    EvaluateFunctionCall((BoundFunctionCallExpression)node),
+                BoundNodeKind.IdentifierNameExpression =>
+                    EvaluateIdentifierNameExpression((BoundIdentifierNameExpression)node),
+                BoundNodeKind.IndirectMemberAccessExpression =>
+                    EvaluateIndirectMemberAccess((BoundIndirectMemberAccessExpression)node),
+                BoundNodeKind.LambdaExpression =>
+                    EvaluateLambdaExpression((BoundLambdaExpression)node),
+                BoundNodeKind.MemberAccessExpression =>
+                    EvaluateMemberAccess((BoundMemberAccessExpression)node),
+                BoundNodeKind.NamedFunctionHandleExpression =>
+                    EvaluateNamedFunctionHandleExpression((BoundNamedFunctionHandleExpression)node),
+                BoundNodeKind.NumberLiteralExpression =>
+                    EvaluateNumberLiteralExpression((BoundNumberLiteralExpression)node),
+                BoundNodeKind.StringLiteralExpression =>
+                    EvaluateStringLiteralExpression((BoundStringLiteralExpression)node),
+                BoundNodeKind.UnaryOperationExpression =>
+                    EvaluateUnaryOperationExpression((BoundUnaryOperationExpression)node),
+                BoundNodeKind.UnquotedStringLiteralExpression =>
+                    EvaluateUnquotedStringLiteralExpression((BoundUnquotedStringLiteralExpression)node),
+                _ => throw new NotImplementedException($"Invalid expression kind '{node.Kind}'."),
+            };
+        }
+
+        private MObject? EvaluateClassInvokation(BoundClassInvokationExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateCommand(BoundCommandExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateIndirectMemberAccess(BoundIndirectMemberAccessExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateMemberAccess(BoundMemberAccessExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateFunctionCall(BoundFunctionCallExpression node)
+        {
+            var arguments = new List<MObject>();
+            var allGood = true;
+            foreach (var argument in node.Arguments)
+            {
+                var evaluatedArgument = EvaluateExpression(argument);
+                if (argument is null)
+                {
+                    _diagnostics.ReportCannotEvaluateExpression(
+                        new TextSpan(argument.Syntax.Position, argument.Syntax.FullWidth));
+                    allGood = false;
+                }
+                else
+                {
+                    arguments.Add(evaluatedArgument);
+                }
+
+            }
+            if (!allGood)
+            {
+                return null;
+            }
+
+            var function = GetFunctionSymbol(node.Name);
+            if (function.Name == "disp")
+            {
+                return EvaluateDisp(arguments);
+            }
+            else
+            {
+                var resolvedFunction = ResolveFunction(function);
+                if (resolvedFunction is null)
+                {
+                    _diagnostics.ReportFunctionNotFound(
+                        new TextSpan(
+                            node.Name.Syntax.Position,
+                            node.Name.Syntax.Position + node.Name.Syntax.FullWidth),
+                        function.Name);
+                    return null;
+                }
+                else
+                {
+                    // bring arguments into context
+                    var newScope = new EvaluationScope();
+                    var counter = 0;
+                    foreach (var expectedArgument in resolvedFunction.InputDescription)
+                    {
+                        if (counter >= arguments.Count)
+                        {
+                            break;
+                        }
+                        newScope.Variables.Add(expectedArgument.Name, arguments[counter]);
+                        counter++;
+                    }
+
+                    if (counter < arguments.Count)
+                    {
+                        _diagnostics.ReportTooManyInputs(
+                            new TextSpan(
+                                node.Arguments[counter].Syntax.Position,
+                                node.Arguments[counter].Syntax.Position + node.Arguments[counter].Syntax.FullWidth),
+                        function.Name);
+                        return null;
+                    }
+                    _scopeStack.Push(newScope);
+                    var result = EvaluateBlockStatement(resolvedFunction.Body);
+                    _scopeStack.Pop();
+                    return result;
+                }
+            }
+        }
+
+        private LoweredFunction? ResolveFunction(UnresolvedFunctionSymbol functionSymbol)
+        {
+            var maybeKey = _functions.Keys.FirstOrDefault(k => k.Name == functionSymbol.Name);
+            return maybeKey switch
+            {
+                { } key => _functions[key],
+                _ => null,
+            };
+        }
+
+        private MObject? EvaluateDisp(List<MObject> arguments)
+        {
+            if (arguments.Count != 1)
+            {
+                throw new NotImplementedException($"Cannot evaluate disp() with {arguments.Count} arguments.");
+            }
+
+            Console.WriteLine(arguments[0]);
+            return arguments[0];
+        }
+
+        private UnresolvedFunctionSymbol GetFunctionSymbol(BoundExpression functionName)
+        {
+            if (functionName.Kind == BoundNodeKind.IdentifierNameExpression)
+            {
+                return new UnresolvedFunctionSymbol(((BoundIdentifierNameExpression)functionName).Name);
+            }
+
+            throw new NotImplementedException($"Unknown function symbol '{functionName.Syntax.Text}'.");
+        }
+
+        private MObject? EvaluateCellArrayElementAccess(BoundCellArrayElementAccessExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateCellArrayLiteralExpression(BoundCellArrayLiteralExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateArrayLiteralExpression(BoundArrayLiteralExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateUnquotedStringLiteralExpression(BoundUnquotedStringLiteralExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateDoubleQuotedStringLiteralExpression(BoundDoubleQuotedStringLiteralExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateStringLiteralExpression(BoundStringLiteralExpression node)
+        {
+            return node.Value switch
+            {
+                string s => MObject.CreateCharArray(s.ToCharArray()),
+                _ => null,
+            };
+        }
+
+        private MObject? EvaluateNumberLiteralExpression(BoundNumberLiteralExpression node)
+        {
+            return MObject.CreateDoubleNumber(node.Value);
+        }
+
+        private MObject? EvaluateIdentifierNameExpression(BoundIdentifierNameExpression node)
+        {
+            var variableName = node.Name;
+            var maybeValue = GetVariableValue(variableName);
+            if (maybeValue is null)
+            {
+                _diagnostics.ReportVariableNotFound(
+                    new TextSpan(node.Syntax.Position, node.Syntax.FullWidth),
+                    variableName);
+            }
+
+            return maybeValue;
+        }
+
+        private MObject? EvaluateBinaryOperation(BoundBinaryOperationExpression node)
+        {
+            var left = EvaluateExpression(node.Left);
+            if (left is null)
+            {
+                return null;
+            }
+
+            var right = EvaluateExpression(node.Right);
+            if (right is null)
+            {
+                return null;
+            }
+
+            return node.Op.Kind switch
+            {
+                BoundBinaryOperatorKind.Plus => MOperations.Plus(left, right),
+                BoundBinaryOperatorKind.Minus => MOperations.Minus(left, right),
+                BoundBinaryOperatorKind.Star => MOperations.Star(left, right),
+                BoundBinaryOperatorKind.Slash => MOperations.Slash(left, right),
+                BoundBinaryOperatorKind.Greater => MOperations.Greater(left, right),
+                BoundBinaryOperatorKind.GreaterOrEquals => MOperations.GreaterOrEquals(left, right),
+                BoundBinaryOperatorKind.Less => MOperations.Less(left, right),
+                BoundBinaryOperatorKind.LessOrEquals => MOperations.LessOrEquals(left, right),
+                _ => throw new NotImplementedException($"Binary operation {node.Op.Kind} is not implemented."),
+            };
+        }
+
+        private MObject? EvaluateCompoundName(BoundCompoundNameExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateUnaryOperationExpression(BoundUnaryOperationExpression node)
+        {
+            var operand = EvaluateExpression(node.Operand);
+            if (operand is null)
+            {
+                return null;
+            }
+
+            return node.Op.Kind switch
+            {
+                BoundUnaryOperatorKind.Minus => MOperations.Minus(operand),
+                _ => throw new NotImplementedException($"Unary operation {node.Op.Kind} is not implemented."),
+            };
+        }
+
+        private MObject? EvaluateEmptyExpression(BoundEmptyExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateAssignmentExpression(BoundAssignmentExpression node)
+        {
+            var rightValue = EvaluateExpression(node.Right);
+            if (rightValue is null)
+            {
+                _diagnostics.ReportCannotEvaluateExpression(
+                    new TextSpan(node.Right.Syntax.Position, node.Right.Syntax.Position + node.Right.Syntax.FullWidth));
+                return null;
+            }
+
+            var left = node.Left;
+            if (left.Kind == BoundNodeKind.IdentifierNameExpression)
+            {
+                var leftIdentifier = (BoundIdentifierNameExpression)left;
+                var variableName = leftIdentifier.Name;
+                SetVariableValue(variableName, rightValue);
+                return rightValue;
+            }
+
+            throw new NotImplementedException();
+        }
+
+        private MObject? GetVariableValue(string name)
+        {
+            if (_inRepl)
+            {
+                return _context.Variables.TryGetValue(name, out var globalValue) ? globalValue : null;
+            }
+            else
+            {
+                var currentScope = _scopeStack.Peek();
+                return currentScope.Variables.TryGetValue(name, out var localValue) ? localValue : null;
+            }
+        }
+
+        private void SetVariableValue(string name, MObject value)
+        {
+            if (_inRepl)
+            {
+                _context.Variables[name] = value;
+            }
+            else
+            {
+                var currentScope = _scopeStack.Peek();
+                currentScope.Variables[name] = value;
+            }
+        }
+
+        private MObject? EvaluateLambdaExpression(BoundLambdaExpression node)
+        {
+            throw new NotImplementedException();
+        }
+
+        private MObject? EvaluateNamedFunctionHandleExpression(BoundNamedFunctionHandleExpression node)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

Parser/Internal/DiagnosticsBag.cs

@@ -1,4 +1,5 @@
-using System.Collections;
+using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 
@@ -37,6 +38,11 @@ namespace Parser.Internal
             Report(span, "Unexpected end of file.");
         }
 
+        internal void ReportNotEnoughInputs(TextSpan span, string functionName)
+        {
+            Report(span, $"Not enough inputs for function '{functionName}'.");
+        }
+
         internal void ReportUnexpectedCharacterWhileParsingNumber(TextSpan span, char c)
         {
             Report(span, $"Unexpected character '{c}' while parsing a number.");
@@ -67,6 +73,11 @@ namespace Parser.Internal
             Report(span, "Unmatched open parenthesis by the end of file.");
         }
 
+        internal void ReportCannotEvaluateExpression(TextSpan span)
+        {
+            Report(span, $"Cannot evaluate expression.");
+        }
+
         public IEnumerator<Diagnostic> GetEnumerator()
         {
             return _diagnostics.GetEnumerator();
@@ -77,5 +88,19 @@ namespace Parser.Internal
             return GetEnumerator();
         }
 
+        internal void ReportVariableNotFound(TextSpan span, string variableName)
+        {
+            Report(span, $"Variable '{variableName}' not found.");
+        }
+
+        internal void ReportFunctionNotFound(TextSpan span, string functionName)
+        {
+            Report(span, $"Function '{functionName}' not found.");
+        }
+
+        internal void ReportTooManyInputs(TextSpan span, string functionName)
+        {
+            Report(span, $"Too many inputs in the call to '{functionName}'.");
+        }
     }
 }

Parser/Internal/GreenNode.cs

@@ -43,6 +43,11 @@ namespace Parser.Internal
 
         internal abstract Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position);
 
+        public virtual object? GetValue()
+        {
+            return null;
+        }
+
         protected int _fullWidth;
 
         public int FullWidth => _fullWidth;

Parser/Internal/MLexerGreen.cs

@@ -13,6 +13,7 @@ namespace Parser.Internal
             public string Text { get; set; } = "";
             public string StringValue { get; set; } = "";
             public double DoubleValue { get; set; }
+            public bool ImaginaryFlag { get; set; }
         }
 
         private ITextWindow Window { get; }
@@ -358,20 +359,48 @@ namespace Parser.Internal
 
             if (success)
             {
+                tokenInfo.Kind = TokenKind.NumberLiteralToken;
+                Range rangeToParse;
                 if (Window.PeekChar(n) == 'i' || Window.PeekChar(n) == 'j')
                 {
+                    tokenInfo.ImaginaryFlag = true;
                     n++;
+                    rangeToParse = ..^1;
+                }
+                else
+                {
+                    rangeToParse = ..;
                 }
-                var s = Window.GetAndConsumeChars(n);
 
-                tokenInfo.Kind = TokenKind.NumberLiteralToken;
+                var s = Window.GetAndConsumeChars(n);
                 tokenInfo.Text = s;
-                return true;
+                var maybeValue = ParseDoubleValue(s[rangeToParse]);
+                if (maybeValue is double value)
+                {
+                    tokenInfo.DoubleValue = value;
+                    return true;
+                }
+                else
+                {
+                    tokenInfo.DoubleValue = double.NaN;
+                    return true;
+                }
             }
 
             return false;
         }
 
+        private double? ParseDoubleValue(string s)
+        {
+            if (double.TryParse(s, out var doubleValue))
+            {
+                return doubleValue;
+            } else
+            {
+                return null;
+            }
+        }
+
         private bool ContinueLexingGeneralStringLiteral(ref TokenInfo tokenInfo, char quote)
         {
             var status = 0; // no errors

Parser/Internal/MParserGreen.cs

@@ -113,7 +113,7 @@ namespace Parser.Internal
                 }
 
                 firstToken = false;
-                outputs.Add(Factory.IdentifierNameSyntax(EatToken(TokenKind.IdentifierToken)));
+                outputs.Add(Factory.IdentifierNameExpressionSyntax(EatToken(TokenKind.IdentifierToken)));
             }
 
             return outputs.ToList();
@@ -141,7 +141,7 @@ namespace Parser.Internal
                 if (PeekToken(1).Kind == TokenKind.EqualsToken)
                 {
                     var identifierToken = EatIdentifier();
-                    builder.Add(Factory.IdentifierNameSyntax(identifierToken));
+                    builder.Add(Factory.IdentifierNameExpressionSyntax(identifierToken));
                     assignmentSign = EatToken(TokenKind.EqualsToken);
                 }
                 else
@@ -175,12 +175,12 @@ namespace Parser.Internal
                 if (CurrentToken.Kind == TokenKind.TildeToken)
                 {
                     var notToken = EatToken();
-                    builder.Add(notToken);
+                    builder.Add(Factory.IdentifierNameExpressionSyntax(notToken));
                 }
                 else
                 {
                     var identifierToken = EatToken(TokenKind.IdentifierToken);
-                    builder.Add(Factory.IdentifierNameSyntax(identifierToken));
+                    builder.Add(Factory.IdentifierNameExpressionSyntax(identifierToken));
                 }
             }
 
@@ -212,7 +212,7 @@ namespace Parser.Internal
             var name = EatToken(TokenKind.IdentifierToken);
             var inputDescription = ParseFunctionInputDescription();
             var commas = ParseOptionalCommas();
-            var body = ParseStatementList();
+            var body = ParseBlockStatement();
             var endKeyword = ParseEndKeyword();
             //var endKeyword = 
             return Factory.FunctionDeclarationSyntax(
@@ -307,13 +307,13 @@ namespace Parser.Internal
             switch (token.Kind)
             {
                 case TokenKind.NumberLiteralToken:
-                    expression = Factory.NumberLiteralSyntax(EatToken());
+                    expression = Factory.NumberLiteralExpressionSyntax(EatToken());
                     break;
                 case TokenKind.StringLiteralToken:
-                    expression = Factory.StringLiteralSyntax(EatToken());
+                    expression = Factory.StringLiteralExpressionSyntax(EatToken());
                     break;
                 case TokenKind.DoubleQuotedStringLiteralToken:
-                    expression = Factory.DoubleQuotedStringLiteralSyntax(EatToken());
+                    expression = Factory.DoubleQuotedStringLiteralExpressionSyntax(EatToken());
                     break;
                 case TokenKind.OpenSquareBracketToken:
                     expression = ParseArrayLiteral();
@@ -329,7 +329,7 @@ namespace Parser.Internal
                     break;
                 default:
                     var id = EatToken(TokenKind.IdentifierToken);
-                    expression = Factory.IdentifierNameSyntax(id);
+                    expression = Factory.IdentifierNameExpressionSyntax(id);
                     break;
             }
 
@@ -377,14 +377,14 @@ namespace Parser.Internal
                             closingBracket);
                         break;
                     case TokenKind.DotToken: // member access
-                        if (expression is IdentifierNameSyntaxNode
-                            || expression is MemberAccessSyntaxNode
+                        if (expression is IdentifierNameExpressionSyntaxNode
+                            || expression is MemberAccessExpressionSyntaxNode
                             || expression is FunctionCallExpressionSyntaxNode
                             || expression is CellArrayElementAccessExpressionSyntaxNode)
                         {
                             var dot = EatToken();
                             var member = ParseMemberAccess();
-                            expression = Factory.MemberAccessSyntax(expression, dot, member);
+                            expression = Factory.MemberAccessExpressionSyntax(expression, dot, member);
                         }
                         else
                         {
@@ -396,7 +396,7 @@ namespace Parser.Internal
                     case TokenKind.ApostropheToken:
                     case TokenKind.DotApostropheToken:
                         var operation = EatToken();
-                        expression = Factory.UnaryPostixOperationExpressionSyntax(expression, operation);
+                        expression = Factory.UnaryPostfixOperationExpressionSyntax(expression, operation);
                         break;
                     case TokenKind.UnquotedStringLiteralToken:
                         return ParseCommandExpression(expression);
@@ -414,15 +414,15 @@ namespace Parser.Internal
 
         private CommandExpressionSyntaxNode ParseCommandExpression(ExpressionSyntaxNode expression)
         {
-            if (expression is IdentifierNameSyntaxNode idNameNode)
+            if (expression is IdentifierNameExpressionSyntaxNode idNameNode)
             {
-                var builder = new SyntaxListBuilder<UnquotedStringLiteralSyntaxNode>();
+                var builder = new SyntaxListBuilder<UnquotedStringLiteralExpressionSyntaxNode>();
                 while (CurrentToken.Kind == TokenKind.UnquotedStringLiteralToken)
                 {
-                    builder.Add(Factory.UnquotedStringLiteralSyntax(EatToken()));
+                    builder.Add(Factory.UnquotedStringLiteralExpressionSyntax(EatToken()));
                 }
 
-                return Factory.CommandExpressionSyntax(idNameNode, builder.ToList());
+                return Factory.CommandExpressionSyntax(idNameNode._name, builder.ToList());
             }
 
             if (expression is null)
@@ -432,9 +432,9 @@ namespace Parser.Internal
             throw new ParsingException($"Unexpected token \"{CurrentToken}\" while parsing expression \"{expression.FullText}\" at {CurrentPosition}.");
         }
 
-        private BaseClassInvokationSyntaxNode ParseBaseClassInvokation(ExpressionSyntaxNode expression)
+        private ClassInvokationExpressionSyntaxNode ParseBaseClassInvokation(ExpressionSyntaxNode expression)
         {
-            if (expression is IdentifierNameSyntaxNode methodName
+            if (expression is IdentifierNameExpressionSyntaxNode methodName
                 && !expression.TrailingTrivia.Any())
             {
                 var atToken = EatToken();
@@ -443,9 +443,9 @@ namespace Parser.Internal
                 {
                     throw new Exception($"Base class name cannot be empty.");
                 }
-                return Factory.BaseClassInvokationSyntax(methodName, atToken, baseClassNameWithArguments);
+                return Factory.ClassInvokationExpressionSyntax(methodName, atToken, baseClassNameWithArguments);
             }
-            if (expression is MemberAccessSyntaxNode memberAccess
+            if (expression is MemberAccessExpressionSyntaxNode memberAccess
                 && !expression.TrailingTrivia.Any())
             {
                 var atToken = EatToken();
@@ -454,7 +454,7 @@ namespace Parser.Internal
                 {
                     throw new Exception($"Base class name cannot be empty.");
                 }
-                return Factory.BaseClassInvokationSyntax(memberAccess, atToken, baseClassNameWithArguments);
+                return Factory.ClassInvokationExpressionSyntax(memberAccess, atToken, baseClassNameWithArguments);
             }
             throw new ParsingException($"Unexpected token \"{CurrentToken}\" at {CurrentPosition}.");
         }
@@ -463,7 +463,7 @@ namespace Parser.Internal
         {
             if (CurrentToken.Kind == TokenKind.IdentifierToken)
             {
-                return Factory.IdentifierNameSyntax(EatToken());
+                return Factory.IdentifierNameExpressionSyntax(EatToken());
             }
             if (CurrentToken.Kind == TokenKind.OpenParenthesisToken)
             {
@@ -474,7 +474,7 @@ namespace Parser.Internal
                     throw new Exception("Indirect member invokation cannot be empty.");
                 }
                 var closingBracket = EatToken(TokenKind.CloseParenthesisToken);
-                return Factory.IndirectMemberAccessSyntax(
+                return Factory.IndirectMemberAccessExpressionSyntax(
                     openingBracket,
                     indirectMember,
                     closingBracket);
@@ -523,7 +523,7 @@ namespace Parser.Internal
                 closeParen);
         }
 
-        private CompoundNameSyntaxNode ParseCompoundName()
+        private CompoundNameExpressionSyntaxNode ParseCompoundName()
         {
             var lastToken = EatToken(TokenKind.IdentifierToken);
             var firstName = lastToken;
@@ -538,16 +538,16 @@ namespace Parser.Internal
                 builder.Add(lastToken);
             }
 
-            return Factory.CompoundNameSyntax(builder.ToList());
+            return Factory.CompoundNameExpressionSyntax(builder.ToList());
         }
 
-        private FunctionHandleSyntaxNode ParseFunctionHandle()
+        private FunctionHandleExpressionSyntaxNode ParseFunctionHandle()
         {
             var atSign = EatToken();
             if (CurrentToken.Kind == TokenKind.IdentifierToken)
             {
                 var compoundName = ParseCompoundName();
-                return Factory.NamedFunctionHandleSyntax(
+                return Factory.NamedFunctionHandleExpressionSyntax(
                     atSign,
                     compoundName);
             }
@@ -563,7 +563,7 @@ namespace Parser.Internal
                 {
                     throw new Exception($"Lambda expression body cannot be empty.");
                 }
-                return Factory.LambdaSyntax(atSign, inputs, body);
+                return Factory.LambdaExpressionSyntax(atSign, inputs, body);
             }
             throw new ParsingException($"Unexpected token {CurrentToken} while parsing function handle at {CurrentPosition}.");
         }
@@ -685,8 +685,8 @@ namespace Parser.Internal
                 throw new Exception("Case label cannot be empty.");
             }
             var commas = ParseOptionalCommas();
-            var statementList = ParseStatementList();
-            return Factory.SwitchCaseSyntax(caseKeyword, caseId, commas, statementList);
+            var body = ParseBlockStatement();
+            return Factory.SwitchCaseSyntax(caseKeyword, caseId, commas, body);
         }
 
         private SwitchStatementSyntaxNode ParseSwitchStatement()
@@ -722,7 +722,7 @@ namespace Parser.Internal
             }
 
             var commas = ParseOptionalCommas();
-            var body = ParseStatementList();
+            var body = ParseBlockStatement();
             var endKeyword = EatIdentifier("end");
             return Factory.WhileStatementSyntax(
                 whileKeyword,
@@ -741,14 +741,14 @@ namespace Parser.Internal
                 throw new Exception("Condition in elseif clause cannot be empty.");
             }
             var commas = ParseOptionalCommas();
-            var body = ParseStatementList();
+            var body = ParseBlockStatement();
             return Factory.ElseifClause(elseifKeyword, condition, commas, body);
         }
 
         private ElseClause ParseElseClause()
         {
             var elseKeyword = EatIdentifier("else");
-            var body = ParseStatementList();
+            var body = ParseBlockStatement();
             return Factory.ElseClause(elseKeyword, body);
         }
 
@@ -761,7 +761,7 @@ namespace Parser.Internal
                 throw new Exception("Condition in if statement cannot be empty.");
             }
             var commas = ParseOptionalSemicolonsOrCommas();
-            var body = ParseStatementList();
+            var body = ParseBlockStatement();
             var elseifClauses = new SyntaxListBuilder<ElseifClause>();
             ElseClause? elseClause = null;
             while (true)
@@ -804,7 +804,7 @@ namespace Parser.Internal
 
             var forAssignment = (AssignmentExpressionSyntaxNode) expression;
             var commas = ParseOptionalSemicolonsOrCommas();
-            var body = ParseStatementList();
+            var body = ParseBlockStatement();
             var endKeyword = EatIdentifier("end");
             return Factory.ForStatementSyntax(
                 forKeyword,
@@ -831,7 +831,7 @@ namespace Parser.Internal
         private TryCatchStatementSyntaxNode ParseTryCatchStatement()
         {
             var tryKeyword = EatIdentifier("try");
-            var tryBody = ParseStatementList();
+            var tryBody = ParseBlockStatement();
             var catchClause = ParseCatchClause();
             var endKeyword = EatIdentifier("end");
             return Factory.TryCatchStatementSyntax(tryKeyword, tryBody, catchClause, endKeyword);
@@ -866,7 +866,7 @@ namespace Parser.Internal
 
         private AttributeSyntaxNode ParseAttribute()
         {
-            var name = Factory.IdentifierNameSyntax(EatToken(TokenKind.IdentifierToken));
+            var name = EatToken(TokenKind.IdentifierToken);
             var assignment = ParseAttributeAssignment();
             return Factory.AttributeSyntax(name, assignment);
         }
@@ -920,16 +920,16 @@ namespace Parser.Internal
             throw new ParsingException($"Unexpected token {CurrentToken} while parsing method declaration at {CurrentPosition}.");
         }
 
-        private MethodDefinitionSyntaxNode ParseMethodDefinition()
+        private ConcreteMethodDeclarationSyntaxNode ParseMethodDefinition()
         {
             var functionKeyword = EatIdentifier("function");
             var outputDescription = ParseFunctionOutputDescription();
             var name = ParseCompoundName();
             var inputDescription = ParseFunctionInputDescription();
             var commas = ParseOptionalCommas();
-            var body = ParseStatementList();
+            var body = ParseBlockStatement();
             var endKeyword = ParseEndKeyword();
-            return Factory.MethodDefinitionSyntax(
+            return Factory.ConcreteMethodDeclarationSyntax(
                 functionKeyword,
                 outputDescription,
                 name,
@@ -1023,7 +1023,7 @@ namespace Parser.Internal
 
         private EnumerationItemSyntaxNode ParseEnumerationItem()
         {
-            var name = Factory.IdentifierNameSyntax(EatToken());
+            var name = EatToken();
             var values = ParseEnumerationValue();
             var commas = ParseOptionalCommas();
             return Factory.EnumerationItemSyntax(name, values, commas);
@@ -1104,7 +1104,7 @@ namespace Parser.Internal
             {
                 attributes = ParseAttributesList();
             }
-            var className = Factory.IdentifierNameSyntax(EatToken(TokenKind.IdentifierToken));
+            var className = EatToken(TokenKind.IdentifierToken);
             BaseClassListSyntaxNode? baseClassList = null;
             if (CurrentToken.Kind == TokenKind.LessToken)
             {
@@ -1191,6 +1191,12 @@ namespace Parser.Internal
             return ParseExpressionStatement();
         }
 
+        private BlockStatementSyntaxNode ParseBlockStatement()
+        {
+            var statements = ParseStatementList();
+            return Factory.BlockStatementSyntax(statements);
+        }
+        
         private SyntaxList ParseStatementList()
         {
             var builder = new SyntaxListBuilder();
@@ -1214,7 +1220,7 @@ namespace Parser.Internal
         
         public FileSyntaxNode ParseFile()
         {
-            var statementList = ParseStatementList();
+            var statementList = ParseBlockStatement();
             var endOfFileToken = EatToken();
             return Factory.FileSyntax(statementList, endOfFileToken);
         }

Parser/Internal/SyntaxFactory.Generated.cs

@@ -3,12 +3,17 @@ namespace Parser.Internal
 {
     internal partial class SyntaxFactory
     {
-        public FileSyntaxNode FileSyntax(SyntaxList statementList, SyntaxToken endOfFile)
+        public FileSyntaxNode FileSyntax(BlockStatementSyntaxNode body, SyntaxToken endOfFile)
         {
-            return new FileSyntaxNode(statementList, endOfFile);
+            return new FileSyntaxNode(body, endOfFile);
         }
 
-        public FunctionDeclarationSyntaxNode FunctionDeclarationSyntax(SyntaxToken functionKeyword, FunctionOutputDescriptionSyntaxNode? outputDescription, SyntaxToken name, FunctionInputDescriptionSyntaxNode? inputDescription, SyntaxList<SyntaxToken> commas, SyntaxList body, EndKeywordSyntaxNode? endKeyword)
+        public BlockStatementSyntaxNode BlockStatementSyntax(SyntaxList statements)
+        {
+            return new BlockStatementSyntaxNode(statements);
+        }
+
+        public FunctionDeclarationSyntaxNode FunctionDeclarationSyntax(SyntaxToken functionKeyword, FunctionOutputDescriptionSyntaxNode? outputDescription, SyntaxToken name, FunctionInputDescriptionSyntaxNode? inputDescription, SyntaxList<SyntaxToken> commas, StatementSyntaxNode body, EndKeywordSyntaxNode? endKeyword)
         {
             return new FunctionDeclarationSyntaxNode(functionKeyword, outputDescription, name, inputDescription, commas, body, endKeyword);
         }
@@ -28,32 +33,32 @@ namespace Parser.Internal
             return new SwitchStatementSyntaxNode(switchKeyword, switchExpression, optionalCommas, cases, endKeyword);
         }
 
-        public SwitchCaseSyntaxNode SwitchCaseSyntax(SyntaxToken caseKeyword, ExpressionSyntaxNode caseIdentifier, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body)
+        public SwitchCaseSyntaxNode SwitchCaseSyntax(SyntaxToken caseKeyword, ExpressionSyntaxNode caseIdentifier, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body)
         {
             return new SwitchCaseSyntaxNode(caseKeyword, caseIdentifier, optionalCommas, body);
         }
 
-        public WhileStatementSyntaxNode WhileStatementSyntax(SyntaxToken whileKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body, SyntaxToken endKeyword)
+        public WhileStatementSyntaxNode WhileStatementSyntax(SyntaxToken whileKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body, SyntaxToken endKeyword)
         {
             return new WhileStatementSyntaxNode(whileKeyword, condition, optionalCommas, body, endKeyword);
         }
 
-        public ElseifClause ElseifClause(SyntaxToken elseifKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body)
+        public ElseifClause ElseifClause(SyntaxToken elseifKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body)
         {
             return new ElseifClause(elseifKeyword, condition, optionalCommas, body);
         }
 
-        public ElseClause ElseClause(SyntaxToken elseKeyword, SyntaxList body)
+        public ElseClause ElseClause(SyntaxToken elseKeyword, StatementSyntaxNode body)
         {
             return new ElseClause(elseKeyword, body);
         }
 
-        public IfStatementSyntaxNode IfStatementSyntax(SyntaxToken ifKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body, SyntaxList<ElseifClause> elseifClauses, ElseClause? elseClause, SyntaxToken endKeyword)
+        public IfStatementSyntaxNode IfStatementSyntax(SyntaxToken ifKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body, SyntaxList<ElseifClause> elseifClauses, ElseClause? elseClause, SyntaxToken endKeyword)
         {
             return new IfStatementSyntaxNode(ifKeyword, condition, optionalCommas, body, elseifClauses, elseClause, endKeyword);
         }
 
-        public ForStatementSyntaxNode ForStatementSyntax(SyntaxToken forKeyword, AssignmentExpressionSyntaxNode assignment, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body, SyntaxToken endKeyword)
+        public ForStatementSyntaxNode ForStatementSyntax(SyntaxToken forKeyword, AssignmentExpressionSyntaxNode assignment, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body, SyntaxToken endKeyword)
         {
             return new ForStatementSyntaxNode(forKeyword, assignment, optionalCommas, body, endKeyword);
         }
@@ -68,7 +73,7 @@ namespace Parser.Internal
             return new CatchClauseSyntaxNode(catchKeyword, catchBody);
         }
 
-        public TryCatchStatementSyntaxNode TryCatchStatementSyntax(SyntaxToken tryKeyword, SyntaxList tryBody, CatchClauseSyntaxNode? catchClause, SyntaxToken endKeyword)
+        public TryCatchStatementSyntaxNode TryCatchStatementSyntax(SyntaxToken tryKeyword, StatementSyntaxNode tryBody, CatchClauseSyntaxNode? catchClause, SyntaxToken endKeyword)
         {
             return new TryCatchStatementSyntaxNode(tryKeyword, tryBody, catchClause, endKeyword);
         }
@@ -93,19 +98,19 @@ namespace Parser.Internal
             return new UnaryPrefixOperationExpressionSyntaxNode(operation, operand);
         }
 
-        public CompoundNameSyntaxNode CompoundNameSyntax(SyntaxList nodes)
+        public CompoundNameExpressionSyntaxNode CompoundNameExpressionSyntax(SyntaxList nodes)
         {
-            return new CompoundNameSyntaxNode(nodes);
+            return new CompoundNameExpressionSyntaxNode(nodes);
         }
 
-        public NamedFunctionHandleSyntaxNode NamedFunctionHandleSyntax(SyntaxToken atSign, CompoundNameSyntaxNode functionName)
+        public NamedFunctionHandleExpressionSyntaxNode NamedFunctionHandleExpressionSyntax(SyntaxToken atSign, CompoundNameExpressionSyntaxNode functionName)
         {
-            return new NamedFunctionHandleSyntaxNode(atSign, functionName);
+            return new NamedFunctionHandleExpressionSyntaxNode(atSign, functionName);
         }
 
-        public LambdaSyntaxNode LambdaSyntax(SyntaxToken atSign, FunctionInputDescriptionSyntaxNode input, ExpressionSyntaxNode body)
+        public LambdaExpressionSyntaxNode LambdaExpressionSyntax(SyntaxToken atSign, FunctionInputDescriptionSyntaxNode input, ExpressionSyntaxNode body)
         {
-            return new LambdaSyntaxNode(atSign, input, body);
+            return new LambdaExpressionSyntaxNode(atSign, input, body);
         }
 
         public BinaryOperationExpressionSyntaxNode BinaryOperationExpressionSyntax(ExpressionSyntaxNode lhs, SyntaxToken operation, ExpressionSyntaxNode rhs)
@@ -113,29 +118,29 @@ namespace Parser.Internal
             return new BinaryOperationExpressionSyntaxNode(lhs, operation, rhs);
         }
 
-        public IdentifierNameSyntaxNode IdentifierNameSyntax(SyntaxToken name)
+        public IdentifierNameExpressionSyntaxNode IdentifierNameExpressionSyntax(SyntaxToken name)
         {
-            return new IdentifierNameSyntaxNode(name);
+            return new IdentifierNameExpressionSyntaxNode(name);
         }
 
-        public NumberLiteralSyntaxNode NumberLiteralSyntax(SyntaxToken number)
+        public NumberLiteralExpressionSyntaxNode NumberLiteralExpressionSyntax(SyntaxToken number)
         {
-            return new NumberLiteralSyntaxNode(number);
+            return new NumberLiteralExpressionSyntaxNode(number);
         }
 
-        public StringLiteralSyntaxNode StringLiteralSyntax(SyntaxToken stringToken)
+        public StringLiteralExpressionSyntaxNode StringLiteralExpressionSyntax(SyntaxToken stringToken)
         {
-            return new StringLiteralSyntaxNode(stringToken);
+            return new StringLiteralExpressionSyntaxNode(stringToken);
         }
 
-        public DoubleQuotedStringLiteralSyntaxNode DoubleQuotedStringLiteralSyntax(SyntaxToken stringToken)
+        public DoubleQuotedStringLiteralExpressionSyntaxNode DoubleQuotedStringLiteralExpressionSyntax(SyntaxToken stringToken)
         {
-            return new DoubleQuotedStringLiteralSyntaxNode(stringToken);
+            return new DoubleQuotedStringLiteralExpressionSyntaxNode(stringToken);
         }
 
-        public UnquotedStringLiteralSyntaxNode UnquotedStringLiteralSyntax(SyntaxToken stringToken)
+        public UnquotedStringLiteralExpressionSyntaxNode UnquotedStringLiteralExpressionSyntax(SyntaxToken stringToken)
         {
-            return new UnquotedStringLiteralSyntaxNode(stringToken);
+            return new UnquotedStringLiteralExpressionSyntaxNode(stringToken);
         }
 
         public ArrayLiteralExpressionSyntaxNode ArrayLiteralExpressionSyntax(SyntaxToken openingSquareBracket, SyntaxList nodes, SyntaxToken closingSquareBracket)
@@ -163,29 +168,29 @@ namespace Parser.Internal
             return new FunctionCallExpressionSyntaxNode(functionName, openingBracket, nodes, closingBracket);
         }
 
-        public MemberAccessSyntaxNode MemberAccessSyntax(SyntaxNode leftOperand, SyntaxToken dot, SyntaxNode rightOperand)
+        public MemberAccessExpressionSyntaxNode MemberAccessExpressionSyntax(SyntaxNode leftOperand, SyntaxToken dot, SyntaxNode rightOperand)
         {
-            return new MemberAccessSyntaxNode(leftOperand, dot, rightOperand);
+            return new MemberAccessExpressionSyntaxNode(leftOperand, dot, rightOperand);
         }
 
-        public UnaryPostixOperationExpressionSyntaxNode UnaryPostixOperationExpressionSyntax(ExpressionSyntaxNode operand, SyntaxToken operation)
+        public UnaryPostfixOperationExpressionSyntaxNode UnaryPostfixOperationExpressionSyntax(ExpressionSyntaxNode operand, SyntaxToken operation)
         {
-            return new UnaryPostixOperationExpressionSyntaxNode(operand, operation);
+            return new UnaryPostfixOperationExpressionSyntaxNode(operand, operation);
         }
 
-        public IndirectMemberAccessSyntaxNode IndirectMemberAccessSyntax(SyntaxToken openingBracket, ExpressionSyntaxNode expression, SyntaxToken closingBracket)
+        public IndirectMemberAccessExpressionSyntaxNode IndirectMemberAccessExpressionSyntax(SyntaxToken openingBracket, ExpressionSyntaxNode expression, SyntaxToken closingBracket)
         {
-            return new IndirectMemberAccessSyntaxNode(openingBracket, expression, closingBracket);
+            return new IndirectMemberAccessExpressionSyntaxNode(openingBracket, expression, closingBracket);
         }
 
-        public CommandExpressionSyntaxNode CommandExpressionSyntax(IdentifierNameSyntaxNode commandName, SyntaxList<UnquotedStringLiteralSyntaxNode> arguments)
+        public CommandExpressionSyntaxNode CommandExpressionSyntax(SyntaxToken commandName, SyntaxList<UnquotedStringLiteralExpressionSyntaxNode> arguments)
         {
             return new CommandExpressionSyntaxNode(commandName, arguments);
         }
 
-        public BaseClassInvokationSyntaxNode BaseClassInvokationSyntax(ExpressionSyntaxNode methodName, SyntaxToken atSign, ExpressionSyntaxNode baseClassNameAndArguments)
+        public ClassInvokationExpressionSyntaxNode ClassInvokationExpressionSyntax(ExpressionSyntaxNode methodName, SyntaxToken atSign, ExpressionSyntaxNode baseClassNameAndArguments)
         {
-            return new BaseClassInvokationSyntaxNode(methodName, atSign, baseClassNameAndArguments);
+            return new ClassInvokationExpressionSyntaxNode(methodName, atSign, baseClassNameAndArguments);
         }
 
         public AttributeAssignmentSyntaxNode AttributeAssignmentSyntax(SyntaxToken assignmentSign, ExpressionSyntaxNode value)
@@ -193,7 +198,7 @@ namespace Parser.Internal
             return new AttributeAssignmentSyntaxNode(assignmentSign, value);
         }
 
-        public AttributeSyntaxNode AttributeSyntax(IdentifierNameSyntaxNode name, AttributeAssignmentSyntaxNode? assignment)
+        public AttributeSyntaxNode AttributeSyntax(SyntaxToken name, AttributeAssignmentSyntaxNode? assignment)
         {
             return new AttributeSyntaxNode(name, assignment);
         }
@@ -203,12 +208,12 @@ namespace Parser.Internal
             return new AttributeListSyntaxNode(openingBracket, nodes, closingBracket);
         }
 
-        public MethodDefinitionSyntaxNode MethodDefinitionSyntax(SyntaxToken functionKeyword, FunctionOutputDescriptionSyntaxNode? outputDescription, CompoundNameSyntaxNode name, FunctionInputDescriptionSyntaxNode? inputDescription, SyntaxList<SyntaxToken> commas, SyntaxList body, EndKeywordSyntaxNode? endKeyword)
+        public ConcreteMethodDeclarationSyntaxNode ConcreteMethodDeclarationSyntax(SyntaxToken functionKeyword, FunctionOutputDescriptionSyntaxNode? outputDescription, CompoundNameExpressionSyntaxNode name, FunctionInputDescriptionSyntaxNode? inputDescription, SyntaxList<SyntaxToken> commas, StatementSyntaxNode body, EndKeywordSyntaxNode? endKeyword)
         {
-            return new MethodDefinitionSyntaxNode(functionKeyword, outputDescription, name, inputDescription, commas, body, endKeyword);
+            return new ConcreteMethodDeclarationSyntaxNode(functionKeyword, outputDescription, name, inputDescription, commas, body, endKeyword);
         }
 
-        public AbstractMethodDeclarationSyntaxNode AbstractMethodDeclarationSyntax(FunctionOutputDescriptionSyntaxNode? outputDescription, CompoundNameSyntaxNode name, FunctionInputDescriptionSyntaxNode? inputDescription)
+        public AbstractMethodDeclarationSyntaxNode AbstractMethodDeclarationSyntax(FunctionOutputDescriptionSyntaxNode? outputDescription, CompoundNameExpressionSyntaxNode name, FunctionInputDescriptionSyntaxNode? inputDescription)
         {
             return new AbstractMethodDeclarationSyntaxNode(outputDescription, name, inputDescription);
         }
@@ -228,7 +233,7 @@ namespace Parser.Internal
             return new BaseClassListSyntaxNode(lessSign, baseClasses);
         }
 
-        public ClassDeclarationSyntaxNode ClassDeclarationSyntax(SyntaxToken classdefKeyword, AttributeListSyntaxNode? attributes, IdentifierNameSyntaxNode className, BaseClassListSyntaxNode? baseClassList, SyntaxList nodes, SyntaxToken endKeyword)
+        public ClassDeclarationSyntaxNode ClassDeclarationSyntax(SyntaxToken classdefKeyword, AttributeListSyntaxNode? attributes, SyntaxToken className, BaseClassListSyntaxNode? baseClassList, SyntaxList nodes, SyntaxToken endKeyword)
         {
             return new ClassDeclarationSyntaxNode(classdefKeyword, attributes, className, baseClassList, nodes, endKeyword);
         }
@@ -238,7 +243,7 @@ namespace Parser.Internal
             return new EnumerationItemValueSyntaxNode(openingBracket, values, closingBracket);
         }
 
-        public EnumerationItemSyntaxNode EnumerationItemSyntax(IdentifierNameSyntaxNode name, EnumerationItemValueSyntaxNode? values, SyntaxList<SyntaxToken> commas)
+        public EnumerationItemSyntaxNode EnumerationItemSyntax(SyntaxToken name, EnumerationItemValueSyntaxNode? values, SyntaxList<SyntaxToken> commas)
         {
             return new EnumerationItemSyntaxNode(name, values, commas);
         }

Parser/Internal/SyntaxNode.Generated.cs

@@ -3,22 +3,22 @@ namespace Parser.Internal
 {
     internal class FileSyntaxNode : SyntaxNode
     {
-        internal readonly SyntaxList _statementList;
+        internal readonly BlockStatementSyntaxNode _body;
         internal readonly SyntaxToken _endOfFile;
-        internal FileSyntaxNode(SyntaxList statementList, SyntaxToken endOfFile): base(TokenKind.File)
+        internal FileSyntaxNode(BlockStatementSyntaxNode body, SyntaxToken endOfFile): base(TokenKind.File)
         {
             Slots = 2;
-            this.AdjustWidth(statementList);
-            _statementList = statementList;
+            this.AdjustWidth(body);
+            _body = body;
             this.AdjustWidth(endOfFile);
             _endOfFile = endOfFile;
         }
 
-        internal FileSyntaxNode(SyntaxList statementList, SyntaxToken endOfFile, TokenDiagnostic[] diagnostics): base(TokenKind.File, diagnostics)
+        internal FileSyntaxNode(BlockStatementSyntaxNode body, SyntaxToken endOfFile, TokenDiagnostic[] diagnostics): base(TokenKind.File, diagnostics)
         {
             Slots = 2;
-            this.AdjustWidth(statementList);
-            _statementList = statementList;
+            this.AdjustWidth(body);
+            _body = body;
             this.AdjustWidth(endOfFile);
             _endOfFile = endOfFile;
         }
@@ -30,14 +30,52 @@ namespace Parser.Internal
 
         public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
         {
-            return new FileSyntaxNode(_statementList, _endOfFile, diagnostics);
+            return new FileSyntaxNode(_body, _endOfFile, diagnostics);
         }
 
         public override GreenNode? GetSlot(int i)
         {
             return i switch
             {
-            0 => _statementList, 1 => _endOfFile, _ => null
+            0 => _body, 1 => _endOfFile, _ => null
+            }
+
+            ;
+        }
+    }
+
+    internal class BlockStatementSyntaxNode : StatementSyntaxNode
+    {
+        internal readonly SyntaxList _statements;
+        internal BlockStatementSyntaxNode(SyntaxList statements): base(TokenKind.BlockStatement)
+        {
+            Slots = 1;
+            this.AdjustWidth(statements);
+            _statements = statements;
+        }
+
+        internal BlockStatementSyntaxNode(SyntaxList statements, TokenDiagnostic[] diagnostics): base(TokenKind.BlockStatement, diagnostics)
+        {
+            Slots = 1;
+            this.AdjustWidth(statements);
+            _statements = statements;
+        }
+
+        internal override Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position)
+        {
+            return new Parser.BlockStatementSyntaxNode(parent, this, position);
+        }
+
+        public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
+        {
+            return new BlockStatementSyntaxNode(_statements, diagnostics);
+        }
+
+        public override GreenNode? GetSlot(int i)
+        {
+            return i switch
+            {
+            0 => _statements, _ => null
             }
 
             ;
@@ -51,9 +89,9 @@ namespace Parser.Internal
         internal readonly SyntaxToken _name;
         internal readonly FunctionInputDescriptionSyntaxNode? _inputDescription;
         internal readonly SyntaxList<SyntaxToken> _commas;
-        internal readonly SyntaxList _body;
+        internal readonly StatementSyntaxNode _body;
         internal readonly EndKeywordSyntaxNode? _endKeyword;
-        internal FunctionDeclarationSyntaxNode(SyntaxToken functionKeyword, FunctionOutputDescriptionSyntaxNode? outputDescription, SyntaxToken name, FunctionInputDescriptionSyntaxNode? inputDescription, SyntaxList<SyntaxToken> commas, SyntaxList body, EndKeywordSyntaxNode? endKeyword): base(TokenKind.FunctionDeclaration)
+        internal FunctionDeclarationSyntaxNode(SyntaxToken functionKeyword, FunctionOutputDescriptionSyntaxNode? outputDescription, SyntaxToken name, FunctionInputDescriptionSyntaxNode? inputDescription, SyntaxList<SyntaxToken> commas, StatementSyntaxNode body, EndKeywordSyntaxNode? endKeyword): base(TokenKind.FunctionDeclaration)
         {
             Slots = 7;
             this.AdjustWidth(functionKeyword);
@@ -72,7 +110,7 @@ namespace Parser.Internal
             _endKeyword = endKeyword;
         }
 
-        internal FunctionDeclarationSyntaxNode(SyntaxToken functionKeyword, FunctionOutputDescriptionSyntaxNode? outputDescription, SyntaxToken name, FunctionInputDescriptionSyntaxNode? inputDescription, SyntaxList<SyntaxToken> commas, SyntaxList body, EndKeywordSyntaxNode? endKeyword, TokenDiagnostic[] diagnostics): base(TokenKind.FunctionDeclaration, diagnostics)
+        internal FunctionDeclarationSyntaxNode(SyntaxToken functionKeyword, FunctionOutputDescriptionSyntaxNode? outputDescription, SyntaxToken name, FunctionInputDescriptionSyntaxNode? inputDescription, SyntaxList<SyntaxToken> commas, StatementSyntaxNode body, EndKeywordSyntaxNode? endKeyword, TokenDiagnostic[] diagnostics): base(TokenKind.FunctionDeclaration, diagnostics)
         {
             Slots = 7;
             this.AdjustWidth(functionKeyword);
@@ -266,8 +304,8 @@ namespace Parser.Internal
         internal readonly SyntaxToken _caseKeyword;
         internal readonly ExpressionSyntaxNode _caseIdentifier;
         internal readonly SyntaxList<SyntaxToken> _optionalCommas;
-        internal readonly SyntaxList _body;
-        internal SwitchCaseSyntaxNode(SyntaxToken caseKeyword, ExpressionSyntaxNode caseIdentifier, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body): base(TokenKind.SwitchCase)
+        internal readonly StatementSyntaxNode _body;
+        internal SwitchCaseSyntaxNode(SyntaxToken caseKeyword, ExpressionSyntaxNode caseIdentifier, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body): base(TokenKind.SwitchCase)
         {
             Slots = 4;
             this.AdjustWidth(caseKeyword);
@@ -280,7 +318,7 @@ namespace Parser.Internal
             _body = body;
         }
 
-        internal SwitchCaseSyntaxNode(SyntaxToken caseKeyword, ExpressionSyntaxNode caseIdentifier, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body, TokenDiagnostic[] diagnostics): base(TokenKind.SwitchCase, diagnostics)
+        internal SwitchCaseSyntaxNode(SyntaxToken caseKeyword, ExpressionSyntaxNode caseIdentifier, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body, TokenDiagnostic[] diagnostics): base(TokenKind.SwitchCase, diagnostics)
         {
             Slots = 4;
             this.AdjustWidth(caseKeyword);
@@ -319,9 +357,9 @@ namespace Parser.Internal
         internal readonly SyntaxToken _whileKeyword;
         internal readonly ExpressionSyntaxNode _condition;
         internal readonly SyntaxList<SyntaxToken> _optionalCommas;
-        internal readonly SyntaxList _body;
+        internal readonly StatementSyntaxNode _body;
         internal readonly SyntaxToken _endKeyword;
-        internal WhileStatementSyntaxNode(SyntaxToken whileKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body, SyntaxToken endKeyword): base(TokenKind.WhileStatement)
+        internal WhileStatementSyntaxNode(SyntaxToken whileKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body, SyntaxToken endKeyword): base(TokenKind.WhileStatement)
         {
             Slots = 5;
             this.AdjustWidth(whileKeyword);
@@ -336,7 +374,7 @@ namespace Parser.Internal
             _endKeyword = endKeyword;
         }
 
-        internal WhileStatementSyntaxNode(SyntaxToken whileKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body, SyntaxToken endKeyword, TokenDiagnostic[] diagnostics): base(TokenKind.WhileStatement, diagnostics)
+        internal WhileStatementSyntaxNode(SyntaxToken whileKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body, SyntaxToken endKeyword, TokenDiagnostic[] diagnostics): base(TokenKind.WhileStatement, diagnostics)
         {
             Slots = 5;
             this.AdjustWidth(whileKeyword);
@@ -377,8 +415,8 @@ namespace Parser.Internal
         internal readonly SyntaxToken _elseifKeyword;
         internal readonly ExpressionSyntaxNode _condition;
         internal readonly SyntaxList<SyntaxToken> _optionalCommas;
-        internal readonly SyntaxList _body;
-        internal ElseifClause(SyntaxToken elseifKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body): base(TokenKind.ElseifClause)
+        internal readonly StatementSyntaxNode _body;
+        internal ElseifClause(SyntaxToken elseifKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body): base(TokenKind.ElseifClause)
         {
             Slots = 4;
             this.AdjustWidth(elseifKeyword);
@@ -391,7 +429,7 @@ namespace Parser.Internal
             _body = body;
         }
 
-        internal ElseifClause(SyntaxToken elseifKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body, TokenDiagnostic[] diagnostics): base(TokenKind.ElseifClause, diagnostics)
+        internal ElseifClause(SyntaxToken elseifKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body, TokenDiagnostic[] diagnostics): base(TokenKind.ElseifClause, diagnostics)
         {
             Slots = 4;
             this.AdjustWidth(elseifKeyword);
@@ -428,8 +466,8 @@ namespace Parser.Internal
     internal class ElseClause : SyntaxNode
     {
         internal readonly SyntaxToken _elseKeyword;
-        internal readonly SyntaxList _body;
-        internal ElseClause(SyntaxToken elseKeyword, SyntaxList body): base(TokenKind.ElseClause)
+        internal readonly StatementSyntaxNode _body;
+        internal ElseClause(SyntaxToken elseKeyword, StatementSyntaxNode body): base(TokenKind.ElseClause)
         {
             Slots = 2;
             this.AdjustWidth(elseKeyword);
@@ -438,7 +476,7 @@ namespace Parser.Internal
             _body = body;
         }
 
-        internal ElseClause(SyntaxToken elseKeyword, SyntaxList body, TokenDiagnostic[] diagnostics): base(TokenKind.ElseClause, diagnostics)
+        internal ElseClause(SyntaxToken elseKeyword, StatementSyntaxNode body, TokenDiagnostic[] diagnostics): base(TokenKind.ElseClause, diagnostics)
         {
             Slots = 2;
             this.AdjustWidth(elseKeyword);
@@ -473,11 +511,11 @@ namespace Parser.Internal
         internal readonly SyntaxToken _ifKeyword;
         internal readonly ExpressionSyntaxNode _condition;
         internal readonly SyntaxList<SyntaxToken> _optionalCommas;
-        internal readonly SyntaxList _body;
+        internal readonly StatementSyntaxNode _body;
         internal readonly SyntaxList<ElseifClause> _elseifClauses;
         internal readonly ElseClause? _elseClause;
         internal readonly SyntaxToken _endKeyword;
-        internal IfStatementSyntaxNode(SyntaxToken ifKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body, SyntaxList<ElseifClause> elseifClauses, ElseClause? elseClause, SyntaxToken endKeyword): base(TokenKind.IfStatement)
+        internal IfStatementSyntaxNode(SyntaxToken ifKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body, SyntaxList<ElseifClause> elseifClauses, ElseClause? elseClause, SyntaxToken endKeyword): base(TokenKind.IfStatement)
         {
             Slots = 7;
             this.AdjustWidth(ifKeyword);
@@ -496,7 +534,7 @@ namespace Parser.Internal
             _endKeyword = endKeyword;
         }
 
-        internal IfStatementSyntaxNode(SyntaxToken ifKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body, SyntaxList<ElseifClause> elseifClauses, ElseClause? elseClause, SyntaxToken endKeyword, TokenDiagnostic[] diagnostics): base(TokenKind.IfStatement, diagnostics)
+        internal IfStatementSyntaxNode(SyntaxToken ifKeyword, ExpressionSyntaxNode condition, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body, SyntaxList<ElseifClause> elseifClauses, ElseClause? elseClause, SyntaxToken endKeyword, TokenDiagnostic[] diagnostics): base(TokenKind.IfStatement, diagnostics)
         {
             Slots = 7;
             this.AdjustWidth(ifKeyword);
@@ -541,9 +579,9 @@ namespace Parser.Internal
         internal readonly SyntaxToken _forKeyword;
         internal readonly AssignmentExpressionSyntaxNode _assignment;
         internal readonly SyntaxList<SyntaxToken> _optionalCommas;
-        internal readonly SyntaxList _body;
+        internal readonly StatementSyntaxNode _body;
         internal readonly SyntaxToken _endKeyword;
-        internal ForStatementSyntaxNode(SyntaxToken forKeyword, AssignmentExpressionSyntaxNode assignment, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body, SyntaxToken endKeyword): base(TokenKind.ForStatement)
+        internal ForStatementSyntaxNode(SyntaxToken forKeyword, AssignmentExpressionSyntaxNode assignment, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body, SyntaxToken endKeyword): base(TokenKind.ForStatement)
         {
             Slots = 5;
             this.AdjustWidth(forKeyword);
@@ -558,7 +596,7 @@ namespace Parser.Internal
             _endKeyword = endKeyword;
         }
 
-        internal ForStatementSyntaxNode(SyntaxToken forKeyword, AssignmentExpressionSyntaxNode assignment, SyntaxList<SyntaxToken> optionalCommas, SyntaxList body, SyntaxToken endKeyword, TokenDiagnostic[] diagnostics): base(TokenKind.ForStatement, diagnostics)
+        internal ForStatementSyntaxNode(SyntaxToken forKeyword, AssignmentExpressionSyntaxNode assignment, SyntaxList<SyntaxToken> optionalCommas, StatementSyntaxNode body, SyntaxToken endKeyword, TokenDiagnostic[] diagnostics): base(TokenKind.ForStatement, diagnostics)
         {
             Slots = 5;
             this.AdjustWidth(forKeyword);
@@ -688,10 +726,10 @@ namespace Parser.Internal
     internal class TryCatchStatementSyntaxNode : StatementSyntaxNode
     {
         internal readonly SyntaxToken _tryKeyword;
-        internal readonly SyntaxList _tryBody;
+        internal readonly StatementSyntaxNode _tryBody;
         internal readonly CatchClauseSyntaxNode? _catchClause;
         internal readonly SyntaxToken _endKeyword;
-        internal TryCatchStatementSyntaxNode(SyntaxToken tryKeyword, SyntaxList tryBody, CatchClauseSyntaxNode? catchClause, SyntaxToken endKeyword): base(TokenKind.TryCatchStatement)
+        internal TryCatchStatementSyntaxNode(SyntaxToken tryKeyword, StatementSyntaxNode tryBody, CatchClauseSyntaxNode? catchClause, SyntaxToken endKeyword): base(TokenKind.TryCatchStatement)
         {
             Slots = 4;
             this.AdjustWidth(tryKeyword);
@@ -704,7 +742,7 @@ namespace Parser.Internal
             _endKeyword = endKeyword;
         }
 
-        internal TryCatchStatementSyntaxNode(SyntaxToken tryKeyword, SyntaxList tryBody, CatchClauseSyntaxNode? catchClause, SyntaxToken endKeyword, TokenDiagnostic[] diagnostics): base(TokenKind.TryCatchStatement, diagnostics)
+        internal TryCatchStatementSyntaxNode(SyntaxToken tryKeyword, StatementSyntaxNode tryBody, CatchClauseSyntaxNode? catchClause, SyntaxToken endKeyword, TokenDiagnostic[] diagnostics): base(TokenKind.TryCatchStatement, diagnostics)
         {
             Slots = 4;
             this.AdjustWidth(tryKeyword);
@@ -890,17 +928,17 @@ namespace Parser.Internal
         }
     }
 
-    internal class CompoundNameSyntaxNode : ExpressionSyntaxNode
+    internal class CompoundNameExpressionSyntaxNode : ExpressionSyntaxNode
     {
         internal readonly SyntaxList _nodes;
-        internal CompoundNameSyntaxNode(SyntaxList nodes): base(TokenKind.CompoundName)
+        internal CompoundNameExpressionSyntaxNode(SyntaxList nodes): base(TokenKind.CompoundNameExpression)
         {
             Slots = 1;
             this.AdjustWidth(nodes);
             _nodes = nodes;
         }
 
-        internal CompoundNameSyntaxNode(SyntaxList nodes, TokenDiagnostic[] diagnostics): base(TokenKind.CompoundName, diagnostics)
+        internal CompoundNameExpressionSyntaxNode(SyntaxList nodes, TokenDiagnostic[] diagnostics): base(TokenKind.CompoundNameExpression, diagnostics)
         {
             Slots = 1;
             this.AdjustWidth(nodes);
@@ -909,12 +947,12 @@ namespace Parser.Internal
 
         internal override Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position)
         {
-            return new Parser.CompoundNameSyntaxNode(parent, this, position);
+            return new Parser.CompoundNameExpressionSyntaxNode(parent, this, position);
         }
 
         public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
         {
-            return new CompoundNameSyntaxNode(_nodes, diagnostics);
+            return new CompoundNameExpressionSyntaxNode(_nodes, diagnostics);
         }
 
         public override GreenNode? GetSlot(int i)
@@ -928,11 +966,11 @@ namespace Parser.Internal
         }
     }
 
-    internal class NamedFunctionHandleSyntaxNode : FunctionHandleSyntaxNode
+    internal class NamedFunctionHandleExpressionSyntaxNode : FunctionHandleExpressionSyntaxNode
     {
         internal readonly SyntaxToken _atSign;
-        internal readonly CompoundNameSyntaxNode _functionName;
-        internal NamedFunctionHandleSyntaxNode(SyntaxToken atSign, CompoundNameSyntaxNode functionName): base(TokenKind.NamedFunctionHandle)
+        internal readonly CompoundNameExpressionSyntaxNode _functionName;
+        internal NamedFunctionHandleExpressionSyntaxNode(SyntaxToken atSign, CompoundNameExpressionSyntaxNode functionName): base(TokenKind.NamedFunctionHandleExpression)
         {
             Slots = 2;
             this.AdjustWidth(atSign);
@@ -941,7 +979,7 @@ namespace Parser.Internal
             _functionName = functionName;
         }
 
-        internal NamedFunctionHandleSyntaxNode(SyntaxToken atSign, CompoundNameSyntaxNode functionName, TokenDiagnostic[] diagnostics): base(TokenKind.NamedFunctionHandle, diagnostics)
+        internal NamedFunctionHandleExpressionSyntaxNode(SyntaxToken atSign, CompoundNameExpressionSyntaxNode functionName, TokenDiagnostic[] diagnostics): base(TokenKind.NamedFunctionHandleExpression, diagnostics)
         {
             Slots = 2;
             this.AdjustWidth(atSign);
@@ -952,12 +990,12 @@ namespace Parser.Internal
 
         internal override Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position)
         {
-            return new Parser.NamedFunctionHandleSyntaxNode(parent, this, position);
+            return new Parser.NamedFunctionHandleExpressionSyntaxNode(parent, this, position);
         }
 
         public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
         {
-            return new NamedFunctionHandleSyntaxNode(_atSign, _functionName, diagnostics);
+            return new NamedFunctionHandleExpressionSyntaxNode(_atSign, _functionName, diagnostics);
         }
 
         public override GreenNode? GetSlot(int i)
@@ -971,12 +1009,12 @@ namespace Parser.Internal
         }
     }
 
-    internal class LambdaSyntaxNode : FunctionHandleSyntaxNode
+    internal class LambdaExpressionSyntaxNode : FunctionHandleExpressionSyntaxNode
     {
         internal readonly SyntaxToken _atSign;
         internal readonly FunctionInputDescriptionSyntaxNode _input;
         internal readonly ExpressionSyntaxNode _body;
-        internal LambdaSyntaxNode(SyntaxToken atSign, FunctionInputDescriptionSyntaxNode input, ExpressionSyntaxNode body): base(TokenKind.Lambda)
+        internal LambdaExpressionSyntaxNode(SyntaxToken atSign, FunctionInputDescriptionSyntaxNode input, ExpressionSyntaxNode body): base(TokenKind.LambdaExpression)
         {
             Slots = 3;
             this.AdjustWidth(atSign);
@@ -987,7 +1025,7 @@ namespace Parser.Internal
             _body = body;
         }
 
-        internal LambdaSyntaxNode(SyntaxToken atSign, FunctionInputDescriptionSyntaxNode input, ExpressionSyntaxNode body, TokenDiagnostic[] diagnostics): base(TokenKind.Lambda, diagnostics)
+        internal LambdaExpressionSyntaxNode(SyntaxToken atSign, FunctionInputDescriptionSyntaxNode input, ExpressionSyntaxNode body, TokenDiagnostic[] diagnostics): base(TokenKind.LambdaExpression, diagnostics)
         {
             Slots = 3;
             this.AdjustWidth(atSign);
@@ -1000,12 +1038,12 @@ namespace Parser.Internal
 
         internal override Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position)
         {
-            return new Parser.LambdaSyntaxNode(parent, this, position);
+            return new Parser.LambdaExpressionSyntaxNode(parent, this, position);
         }
 
         public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
         {
-            return new LambdaSyntaxNode(_atSign, _input, _body, diagnostics);
+            return new LambdaExpressionSyntaxNode(_atSign, _input, _body, diagnostics);
         }
 
         public override GreenNode? GetSlot(int i)
@@ -1024,7 +1062,7 @@ namespace Parser.Internal
         internal readonly ExpressionSyntaxNode _lhs;
         internal readonly SyntaxToken _operation;
         internal readonly ExpressionSyntaxNode _rhs;
-        internal BinaryOperationExpressionSyntaxNode(ExpressionSyntaxNode lhs, SyntaxToken operation, ExpressionSyntaxNode rhs): base(TokenKind.BinaryOperation)
+        internal BinaryOperationExpressionSyntaxNode(ExpressionSyntaxNode lhs, SyntaxToken operation, ExpressionSyntaxNode rhs): base(TokenKind.BinaryOperationExpression)
         {
             Slots = 3;
             this.AdjustWidth(lhs);
@@ -1035,7 +1073,7 @@ namespace Parser.Internal
             _rhs = rhs;
         }
 
-        internal BinaryOperationExpressionSyntaxNode(ExpressionSyntaxNode lhs, SyntaxToken operation, ExpressionSyntaxNode rhs, TokenDiagnostic[] diagnostics): base(TokenKind.BinaryOperation, diagnostics)
+        internal BinaryOperationExpressionSyntaxNode(ExpressionSyntaxNode lhs, SyntaxToken operation, ExpressionSyntaxNode rhs, TokenDiagnostic[] diagnostics): base(TokenKind.BinaryOperationExpression, diagnostics)
         {
             Slots = 3;
             this.AdjustWidth(lhs);
@@ -1067,17 +1105,17 @@ namespace Parser.Internal
         }
     }
 
-    internal class IdentifierNameSyntaxNode : ExpressionSyntaxNode
+    internal class IdentifierNameExpressionSyntaxNode : ExpressionSyntaxNode
     {
         internal readonly SyntaxToken _name;
-        internal IdentifierNameSyntaxNode(SyntaxToken name): base(TokenKind.IdentifierName)
+        internal IdentifierNameExpressionSyntaxNode(SyntaxToken name): base(TokenKind.IdentifierNameExpression)
         {
             Slots = 1;
             this.AdjustWidth(name);
             _name = name;
         }
 
-        internal IdentifierNameSyntaxNode(SyntaxToken name, TokenDiagnostic[] diagnostics): base(TokenKind.IdentifierName, diagnostics)
+        internal IdentifierNameExpressionSyntaxNode(SyntaxToken name, TokenDiagnostic[] diagnostics): base(TokenKind.IdentifierNameExpression, diagnostics)
         {
             Slots = 1;
             this.AdjustWidth(name);
@@ -1086,12 +1124,12 @@ namespace Parser.Internal
 
         internal override Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position)
         {
-            return new Parser.IdentifierNameSyntaxNode(parent, this, position);
+            return new Parser.IdentifierNameExpressionSyntaxNode(parent, this, position);
         }
 
         public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
         {
-            return new IdentifierNameSyntaxNode(_name, diagnostics);
+            return new IdentifierNameExpressionSyntaxNode(_name, diagnostics);
         }
 
         public override GreenNode? GetSlot(int i)
@@ -1105,17 +1143,17 @@ namespace Parser.Internal
         }
     }
 
-    internal class NumberLiteralSyntaxNode : ExpressionSyntaxNode
+    internal class NumberLiteralExpressionSyntaxNode : ExpressionSyntaxNode
     {
         internal readonly SyntaxToken _number;
-        internal NumberLiteralSyntaxNode(SyntaxToken number): base(TokenKind.NumberLiteralExpression)
+        internal NumberLiteralExpressionSyntaxNode(SyntaxToken number): base(TokenKind.NumberLiteralExpression)
         {
             Slots = 1;
             this.AdjustWidth(number);
             _number = number;
         }
 
-        internal NumberLiteralSyntaxNode(SyntaxToken number, TokenDiagnostic[] diagnostics): base(TokenKind.NumberLiteralExpression, diagnostics)
+        internal NumberLiteralExpressionSyntaxNode(SyntaxToken number, TokenDiagnostic[] diagnostics): base(TokenKind.NumberLiteralExpression, diagnostics)
         {
             Slots = 1;
             this.AdjustWidth(number);
@@ -1124,12 +1162,12 @@ namespace Parser.Internal
 
         internal override Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position)
         {
-            return new Parser.NumberLiteralSyntaxNode(parent, this, position);
+            return new Parser.NumberLiteralExpressionSyntaxNode(parent, this, position);
         }
 
         public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
         {
-            return new NumberLiteralSyntaxNode(_number, diagnostics);
+            return new NumberLiteralExpressionSyntaxNode(_number, diagnostics);
         }
 
         public override GreenNode? GetSlot(int i)
@@ -1143,17 +1181,17 @@ namespace Parser.Internal
         }
     }
 
-    internal class StringLiteralSyntaxNode : ExpressionSyntaxNode
+    internal class StringLiteralExpressionSyntaxNode : ExpressionSyntaxNode
     {
         internal readonly SyntaxToken _stringToken;
-        internal StringLiteralSyntaxNode(SyntaxToken stringToken): base(TokenKind.StringLiteralExpression)
+        internal StringLiteralExpressionSyntaxNode(SyntaxToken stringToken): base(TokenKind.StringLiteralExpression)
         {
             Slots = 1;
             this.AdjustWidth(stringToken);
             _stringToken = stringToken;
         }
 
-        internal StringLiteralSyntaxNode(SyntaxToken stringToken, TokenDiagnostic[] diagnostics): base(TokenKind.StringLiteralExpression, diagnostics)
+        internal StringLiteralExpressionSyntaxNode(SyntaxToken stringToken, TokenDiagnostic[] diagnostics): base(TokenKind.StringLiteralExpression, diagnostics)
         {
             Slots = 1;
             this.AdjustWidth(stringToken);
@@ -1162,12 +1200,12 @@ namespace Parser.Internal
 
         internal override Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position)
         {
-            return new Parser.StringLiteralSyntaxNode(parent, this, position);
+            return new Parser.StringLiteralExpressionSyntaxNode(parent, this, position);
         }
 
         public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
         {
-            return new StringLiteralSyntaxNode(_stringToken, diagnostics);
+            return new StringLiteralExpressionSyntaxNode(_stringToken, diagnostics);
         }
 
         public override GreenNode? GetSlot(int i)
@@ -1181,17 +1219,17 @@ namespace Parser.Internal
         }
     }
 
-    internal class DoubleQuotedStringLiteralSyntaxNode : ExpressionSyntaxNode
+    internal class DoubleQuotedStringLiteralExpressionSyntaxNode : ExpressionSyntaxNode
     {
         internal readonly SyntaxToken _stringToken;
-        internal DoubleQuotedStringLiteralSyntaxNode(SyntaxToken stringToken): base(TokenKind.DoubleQuotedStringLiteralExpression)
+        internal DoubleQuotedStringLiteralExpressionSyntaxNode(SyntaxToken stringToken): base(TokenKind.DoubleQuotedStringLiteralExpression)
         {
             Slots = 1;
             this.AdjustWidth(stringToken);
             _stringToken = stringToken;
         }
 
-        internal DoubleQuotedStringLiteralSyntaxNode(SyntaxToken stringToken, TokenDiagnostic[] diagnostics): base(TokenKind.DoubleQuotedStringLiteralExpression, diagnostics)
+        internal DoubleQuotedStringLiteralExpressionSyntaxNode(SyntaxToken stringToken, TokenDiagnostic[] diagnostics): base(TokenKind.DoubleQuotedStringLiteralExpression, diagnostics)
         {
             Slots = 1;
             this.AdjustWidth(stringToken);
@@ -1200,12 +1238,12 @@ namespace Parser.Internal
 
         internal override Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position)
         {
-            return new Parser.DoubleQuotedStringLiteralSyntaxNode(parent, this, position);
+            return new Parser.DoubleQuotedStringLiteralExpressionSyntaxNode(parent, this, position);
         }
 
         public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
         {
-            return new DoubleQuotedStringLiteralSyntaxNode(_stringToken, diagnostics);
+            return new DoubleQuotedStringLiteralExpressionSyntaxNode(_stringToken, diagnostics);
         }
 
         public override GreenNode? GetSlot(int i)
@@ -1219,17 +1257,17 @@ namespace Parser.Internal
         }
     }
 
-    internal class UnquotedStringLiteralSyntaxNode : ExpressionSyntaxNode
+    internal class UnquotedStringLiteralExpressionSyntaxNode : ExpressionSyntaxNode
     {
         internal readonly SyntaxToken _stringToken;
-        internal UnquotedStringLiteralSyntaxNode(SyntaxToken stringToken): base(TokenKind.UnquotedStringLiteralExpression)
+        internal UnquotedStringLiteralExpressionSyntaxNode(SyntaxToken stringToken): base(TokenKind.UnquotedStringLiteralExpression)
         {
             Slots = 1;
             this.AdjustWidth(stringToken);
             _stringToken = stringToken;
         }
 
-        internal UnquotedStringLiteralSyntaxNode(SyntaxToken stringToken, TokenDiagnostic[] diagnostics): base(TokenKind.UnquotedStringLiteralExpression, diagnostics)
+        internal UnquotedStringLiteralExpressionSyntaxNode(SyntaxToken stringToken, TokenDiagnostic[] diagnostics): base(TokenKind.UnquotedStringLiteralExpression, diagnostics)
         {
             Slots = 1;
             this.AdjustWidth(stringToken);
@@ -1238,12 +1276,12 @@ namespace Parser.Internal
 
         internal override Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position)
         {
-            return new Parser.UnquotedStringLiteralSyntaxNode(parent, this, position);
+            return new Parser.UnquotedStringLiteralExpressionSyntaxNode(parent, this, position);
         }
 
         public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
         {
-            return new UnquotedStringLiteralSyntaxNode(_stringToken, diagnostics);
+            return new UnquotedStringLiteralExpressionSyntaxNode(_stringToken, diagnostics);
         }
 
         public override GreenNode? GetSlot(int i)
@@ -1407,7 +1445,7 @@ namespace Parser.Internal
         internal readonly SyntaxToken _openingBrace;
         internal readonly SyntaxList _nodes;
         internal readonly SyntaxToken _closingBrace;
-        internal CellArrayElementAccessExpressionSyntaxNode(ExpressionSyntaxNode expression, SyntaxToken openingBrace, SyntaxList nodes, SyntaxToken closingBrace): base(TokenKind.CellArrayElementAccess)
+        internal CellArrayElementAccessExpressionSyntaxNode(ExpressionSyntaxNode expression, SyntaxToken openingBrace, SyntaxList nodes, SyntaxToken closingBrace): base(TokenKind.CellArrayElementAccessExpression)
         {
             Slots = 4;
             this.AdjustWidth(expression);
@@ -1420,7 +1458,7 @@ namespace Parser.Internal
             _closingBrace = closingBrace;
         }
 
-        internal CellArrayElementAccessExpressionSyntaxNode(ExpressionSyntaxNode expression, SyntaxToken openingBrace, SyntaxList nodes, SyntaxToken closingBrace, TokenDiagnostic[] diagnostics): base(TokenKind.CellArrayElementAccess, diagnostics)
+        internal CellArrayElementAccessExpressionSyntaxNode(ExpressionSyntaxNode expression, SyntaxToken openingBrace, SyntaxList nodes, SyntaxToken closingBrace, TokenDiagnostic[] diagnostics): base(TokenKind.CellArrayElementAccessExpression, diagnostics)
         {
             Slots = 4;
             this.AdjustWidth(expression);
@@ -1460,7 +1498,7 @@ namespace Parser.Internal
         internal readonly SyntaxToken _openingBracket;
         internal readonly SyntaxList _nodes;
         internal readonly SyntaxToken _closingBracket;
-        internal FunctionCallExpressionSyntaxNode(ExpressionSyntaxNode functionName, SyntaxToken openingBracket, SyntaxList nodes, SyntaxToken closingBracket): base(TokenKind.FunctionCall)
+        internal FunctionCallExpressionSyntaxNode(ExpressionSyntaxNode functionName, SyntaxToken openingBracket, SyntaxList nodes, SyntaxToken closingBracket): base(TokenKind.FunctionCallExpression)
         {
             Slots = 4;
             this.AdjustWidth(functionName);
@@ -1473,7 +1511,7 @@ namespace Parser.Internal
             _closingBracket = closingBracket;
         }
 
-        internal FunctionCallExpressionSyntaxNode(ExpressionSyntaxNode functionName, SyntaxToken openingBracket, SyntaxList nodes, SyntaxToken closingBracket, TokenDiagnostic[] diagnostics): base(TokenKind.FunctionCall, diagnostics)
+        internal FunctionCallExpressionSyntaxNode(ExpressionSyntaxNode functionName, SyntaxToken openingBracket, SyntaxList nodes, SyntaxToken closingBracket, TokenDiagnostic[] diagnostics): base(TokenKind.FunctionCallExpression, diagnostics)
         {
             Slots = 4;
             this.AdjustWidth(functionName);
@@ -1507,12 +1545,12 @@ namespace Parser.Internal
         }
     }
 
-    internal class MemberAccessSyntaxNode : ExpressionSyntaxNode
+    internal class MemberAccessExpressionSyntaxNode : ExpressionSyntaxNode
     {
         internal readonly SyntaxNode _leftOperand;
         internal readonly SyntaxToken _dot;
         internal readonly SyntaxNode _rightOperand;
-        internal MemberAccessSyntaxNode(SyntaxNode leftOperand, SyntaxToken dot, SyntaxNode rightOperand): base(TokenKind.MemberAccess)
+        internal MemberAccessExpressionSyntaxNode(SyntaxNode leftOperand, SyntaxToken dot, SyntaxNode rightOperand): base(TokenKind.MemberAccessExpression)
         {
             Slots = 3;
             this.AdjustWidth(leftOperand);
@@ -1523,7 +1561,7 @@ namespace Parser.Internal
             _rightOperand = rightOperand;
         }
 
-        internal MemberAccessSyntaxNode(SyntaxNode leftOperand, SyntaxToken dot, SyntaxNode rightOperand, TokenDiagnostic[] diagnostics): base(TokenKind.MemberAccess, diagnostics)
+        internal MemberAccessExpressionSyntaxNode(SyntaxNode leftOperand, SyntaxToken dot, SyntaxNode rightOperand, TokenDiagnostic[] diagnostics): base(TokenKind.MemberAccessExpression, diagnostics)
         {
             Slots = 3;
             this.AdjustWidth(leftOperand);
@@ -1536,12 +1574,12 @@ namespace Parser.Internal
 
         internal override Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position)
         {
-            return new Parser.MemberAccessSyntaxNode(parent, this, position);
+            return new Parser.MemberAccessExpressionSyntaxNode(parent, this, position);
         }
 
         public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
         {
-            return new MemberAccessSyntaxNode(_leftOperand, _dot, _rightOperand, diagnostics);
+            return new MemberAccessExpressionSyntaxNode(_leftOperand, _dot, _rightOperand, diagnostics);
         }
 
         public override GreenNode? GetSlot(int i)
@@ -1555,11 +1593,11 @@ namespace Parser.Internal
         }
     }
 
-    internal class UnaryPostixOperationExpressionSyntaxNode : ExpressionSyntaxNode
+    internal class UnaryPostfixOperationExpressionSyntaxNode : ExpressionSyntaxNode
     {
         internal readonly ExpressionSyntaxNode _operand;
         internal readonly SyntaxToken _operation;
-        internal UnaryPostixOperationExpressionSyntaxNode(ExpressionSyntaxNode operand, SyntaxToken operation): base(TokenKind.UnaryPostfixOperationExpression)
+        internal UnaryPostfixOperationExpressionSyntaxNode(ExpressionSyntaxNode operand, SyntaxToken operation): base(TokenKind.UnaryPostfixOperationExpression)
         {
             Slots = 2;
             this.AdjustWidth(operand);
@@ -1568,7 +1606,7 @@ namespace Parser.Internal
             _operation = operation;
         }
 
-        internal UnaryPostixOperationExpressionSyntaxNode(ExpressionSyntaxNode operand, SyntaxToken operation, TokenDiagnostic[] diagnostics): base(TokenKind.UnaryPostfixOperationExpression, diagnostics)
+        internal UnaryPostfixOperationExpressionSyntaxNode(ExpressionSyntaxNode operand, SyntaxToken operation, TokenDiagnostic[] diagnostics): base(TokenKind.UnaryPostfixOperationExpression, diagnostics)
         {
             Slots = 2;
             this.AdjustWidth(operand);
@@ -1579,12 +1617,12 @@ namespace Parser.Internal
 
         internal override Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position)
         {
-            return new Parser.UnaryPostixOperationExpressionSyntaxNode(parent, this, position);
+            return new Parser.UnaryPostfixOperationExpressionSyntaxNode(parent, this, position);
         }
 
         public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
         {
-            return new UnaryPostixOperationExpressionSyntaxNode(_operand, _operation, diagnostics);
+            return new UnaryPostfixOperationExpressionSyntaxNode(_operand, _operation, diagnostics);
         }
 
         public override GreenNode? GetSlot(int i)
@@ -1598,12 +1636,12 @@ namespace Parser.Internal
         }
     }
 
-    internal class IndirectMemberAccessSyntaxNode : ExpressionSyntaxNode
+    internal class IndirectMemberAccessExpressionSyntaxNode : ExpressionSyntaxNode
     {
         internal readonly SyntaxToken _openingBracket;
         internal readonly ExpressionSyntaxNode _expression;
         internal readonly SyntaxToken _closingBracket;
-        internal IndirectMemberAccessSyntaxNode(SyntaxToken openingBracket, ExpressionSyntaxNode expression, SyntaxToken closingBracket): base(TokenKind.IndirectMemberAccess)
+        internal IndirectMemberAccessExpressionSyntaxNode(SyntaxToken openingBracket, ExpressionSyntaxNode expression, SyntaxToken closingBracket): base(TokenKind.IndirectMemberAccessExpression)
         {
             Slots = 3;
             this.AdjustWidth(openingBracket);
@@ -1614,7 +1652,7 @@ namespace Parser.Internal
             _closingBracket = closingBracket;
         }
 
-        internal IndirectMemberAccessSyntaxNode(SyntaxToken openingBracket, ExpressionSyntaxNode expression, SyntaxToken closingBracket, TokenDiagnostic[] diagnostics): base(TokenKind.IndirectMemberAccess, diagnostics)
+        internal IndirectMemberAccessExpressionSyntaxNode(SyntaxToken openingBracket, ExpressionSyntaxNode expression, SyntaxToken closingBracket, TokenDiagnostic[] diagnostics): base(TokenKind.IndirectMemberAccessExpression, diagnostics)
         {
             Slots = 3;
             this.AdjustWidth(openingBracket);
@@ -1627,12 +1665,12 @@ namespace Parser.Internal
 
         internal override Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position)
         {
-            return new Parser.IndirectMemberAccessSyntaxNode(parent, this, position);
+            return new Parser.IndirectMemberAccessExpressionSyntaxNode(parent, this, position);
         }
 
         public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
         {
-            return new IndirectMemberAccessSyntaxNode(_openingBracket, _expression, _closingBracket, diagnostics);
+            return new IndirectMemberAccessExpressionSyntaxNode(_openingBracket, _expression, _closingBracket, diagnostics);
         }
 
         public override GreenNode? GetSlot(int i)
@@ -1648,9 +1686,9 @@ namespace Parser.Internal
 
     internal class CommandExpressionSyntaxNode : ExpressionSyntaxNode
     {
-        internal readonly IdentifierNameSyntaxNode _commandName;
-        internal readonly SyntaxList<UnquotedStringLiteralSyntaxNode> _arguments;
-        internal CommandExpressionSyntaxNode(IdentifierNameSyntaxNode commandName, SyntaxList<UnquotedStringLiteralSyntaxNode> arguments): base(TokenKind.Command)
+        internal readonly SyntaxToken _commandName;
+        internal readonly SyntaxList<UnquotedStringLiteralExpressionSyntaxNode> _arguments;
+        internal CommandExpressionSyntaxNode(SyntaxToken commandName, SyntaxList<UnquotedStringLiteralExpressionSyntaxNode> arguments): base(TokenKind.CommandExpression)
         {
             Slots = 2;
             this.AdjustWidth(commandName);
@@ -1659,7 +1697,7 @@ namespace Parser.Internal
             _arguments = arguments;
         }
 
-        internal CommandExpressionSyntaxNode(IdentifierNameSyntaxNode commandName, SyntaxList<UnquotedStringLiteralSyntaxNode> arguments, TokenDiagnostic[] diagnostics): base(TokenKind.Command, diagnostics)
+        internal CommandExpressionSyntaxNode(SyntaxToken commandName, SyntaxList<UnquotedStringLiteralExpressionSyntaxNode> arguments, TokenDiagnostic[] diagnostics): base(TokenKind.CommandExpression, diagnostics)
         {
             Slots = 2;
             this.AdjustWidth(commandName);
@@ -1689,12 +1727,12 @@ namespace Parser.Internal
         }
     }
 
-    internal class BaseClassInvokationSyntaxNode : ExpressionSyntaxNode
+    internal class ClassInvokationExpressionSyntaxNode : ExpressionSyntaxNode
     {
         internal readonly ExpressionSyntaxNode _methodName;
         internal readonly SyntaxToken _atSign;
         internal readonly ExpressionSyntaxNode _baseClassNameAndArguments;
-        internal BaseClassInvokationSyntaxNode(ExpressionSyntaxNode methodName, SyntaxToken atSign, ExpressionSyntaxNode baseClassNameAndArguments): base(TokenKind.ClassInvokation)
+        internal ClassInvokationExpressionSyntaxNode(ExpressionSyntaxNode methodName, SyntaxToken atSign, ExpressionSyntaxNode baseClassNameAndArguments): base(TokenKind.ClassInvokationExpression)
         {
             Slots = 3;
             this.AdjustWidth(methodName);
@@ -1705,7 +1743,7 @@ namespace Parser.Internal
             _baseClassNameAndArguments = baseClassNameAndArguments;
         }
 
-        internal BaseClassInvokationSyntaxNode(ExpressionSyntaxNode methodName, SyntaxToken atSign, ExpressionSyntaxNode baseClassNameAndArguments, TokenDiagnostic[] diagnostics): base(TokenKind.ClassInvokation, diagnostics)
+        internal ClassInvokationExpressionSyntaxNode(ExpressionSyntaxNode methodName, SyntaxToken atSign, ExpressionSyntaxNode baseClassNameAndArguments, TokenDiagnostic[] diagnostics): base(TokenKind.ClassInvokationExpression, diagnostics)
         {
             Slots = 3;
             this.AdjustWidth(methodName);
@@ -1718,12 +1756,12 @@ namespace Parser.Internal
 
         internal override Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position)
         {
-            return new Parser.BaseClassInvokationSyntaxNode(parent, this, position);
+            return new Parser.ClassInvokationExpressionSyntaxNode(parent, this, position);
         }
 
         public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
         {
-            return new BaseClassInvokationSyntaxNode(_methodName, _atSign, _baseClassNameAndArguments, diagnostics);
+            return new ClassInvokationExpressionSyntaxNode(_methodName, _atSign, _baseClassNameAndArguments, diagnostics);
         }
 
         public override GreenNode? GetSlot(int i)
@@ -1782,9 +1820,9 @@ namespace Parser.Internal
 
     internal class AttributeSyntaxNode : SyntaxNode
     {
-        internal readonly IdentifierNameSyntaxNode _name;
+        internal readonly SyntaxToken _name;
         internal readonly AttributeAssignmentSyntaxNode? _assignment;
-        internal AttributeSyntaxNode(IdentifierNameSyntaxNode name, AttributeAssignmentSyntaxNode? assignment): base(TokenKind.Attribute)
+        internal AttributeSyntaxNode(SyntaxToken name, AttributeAssignmentSyntaxNode? assignment): base(TokenKind.Attribute)
         {
             Slots = 2;
             this.AdjustWidth(name);
@@ -1793,7 +1831,7 @@ namespace Parser.Internal
             _assignment = assignment;
         }
 
-        internal AttributeSyntaxNode(IdentifierNameSyntaxNode name, AttributeAssignmentSyntaxNode? assignment, TokenDiagnostic[] diagnostics): base(TokenKind.Attribute, diagnostics)
+        internal AttributeSyntaxNode(SyntaxToken name, AttributeAssignmentSyntaxNode? assignment, TokenDiagnostic[] diagnostics): base(TokenKind.Attribute, diagnostics)
         {
             Slots = 2;
             this.AdjustWidth(name);
@@ -1871,16 +1909,16 @@ namespace Parser.Internal
         }
     }
 
-    internal class MethodDefinitionSyntaxNode : MethodDeclarationSyntaxNode
+    internal class ConcreteMethodDeclarationSyntaxNode : MethodDeclarationSyntaxNode
     {
         internal readonly SyntaxToken _functionKeyword;
         internal readonly FunctionOutputDescriptionSyntaxNode? _outputDescription;
-        internal readonly CompoundNameSyntaxNode _name;
+        internal readonly CompoundNameExpressionSyntaxNode _name;
         internal readonly FunctionInputDescriptionSyntaxNode? _inputDescription;
         internal readonly SyntaxList<SyntaxToken> _commas;
-        internal readonly SyntaxList _body;
+        internal readonly StatementSyntaxNode _body;
         internal readonly EndKeywordSyntaxNode? _endKeyword;
-        internal MethodDefinitionSyntaxNode(SyntaxToken functionKeyword, FunctionOutputDescriptionSyntaxNode? outputDescription, CompoundNameSyntaxNode name, FunctionInputDescriptionSyntaxNode? inputDescription, SyntaxList<SyntaxToken> commas, SyntaxList body, EndKeywordSyntaxNode? endKeyword): base(TokenKind.MethodDefinition)
+        internal ConcreteMethodDeclarationSyntaxNode(SyntaxToken functionKeyword, FunctionOutputDescriptionSyntaxNode? outputDescription, CompoundNameExpressionSyntaxNode name, FunctionInputDescriptionSyntaxNode? inputDescription, SyntaxList<SyntaxToken> commas, StatementSyntaxNode body, EndKeywordSyntaxNode? endKeyword): base(TokenKind.ConcreteMethodDeclaration)
         {
             Slots = 7;
             this.AdjustWidth(functionKeyword);
@@ -1899,7 +1937,7 @@ namespace Parser.Internal
             _endKeyword = endKeyword;
         }
 
-        internal MethodDefinitionSyntaxNode(SyntaxToken functionKeyword, FunctionOutputDescriptionSyntaxNode? outputDescription, CompoundNameSyntaxNode name, FunctionInputDescriptionSyntaxNode? inputDescription, SyntaxList<SyntaxToken> commas, SyntaxList body, EndKeywordSyntaxNode? endKeyword, TokenDiagnostic[] diagnostics): base(TokenKind.MethodDefinition, diagnostics)
+        internal ConcreteMethodDeclarationSyntaxNode(SyntaxToken functionKeyword, FunctionOutputDescriptionSyntaxNode? outputDescription, CompoundNameExpressionSyntaxNode name, FunctionInputDescriptionSyntaxNode? inputDescription, SyntaxList<SyntaxToken> commas, StatementSyntaxNode body, EndKeywordSyntaxNode? endKeyword, TokenDiagnostic[] diagnostics): base(TokenKind.ConcreteMethodDeclaration, diagnostics)
         {
             Slots = 7;
             this.AdjustWidth(functionKeyword);
@@ -1920,12 +1958,12 @@ namespace Parser.Internal
 
         internal override Parser.SyntaxNode CreateRed(Parser.SyntaxNode parent, int position)
         {
-            return new Parser.MethodDefinitionSyntaxNode(parent, this, position);
+            return new Parser.ConcreteMethodDeclarationSyntaxNode(parent, this, position);
         }
 
         public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
         {
-            return new MethodDefinitionSyntaxNode(_functionKeyword, _outputDescription, _name, _inputDescription, _commas, _body, _endKeyword, diagnostics);
+            return new ConcreteMethodDeclarationSyntaxNode(_functionKeyword, _outputDescription, _name, _inputDescription, _commas, _body, _endKeyword, diagnostics);
         }
 
         public override GreenNode? GetSlot(int i)
@@ -1942,9 +1980,9 @@ namespace Parser.Internal
     internal class AbstractMethodDeclarationSyntaxNode : MethodDeclarationSyntaxNode
     {
         internal readonly FunctionOutputDescriptionSyntaxNode? _outputDescription;
-        internal readonly CompoundNameSyntaxNode _name;
+        internal readonly CompoundNameExpressionSyntaxNode _name;
         internal readonly FunctionInputDescriptionSyntaxNode? _inputDescription;
-        internal AbstractMethodDeclarationSyntaxNode(FunctionOutputDescriptionSyntaxNode? outputDescription, CompoundNameSyntaxNode name, FunctionInputDescriptionSyntaxNode? inputDescription): base(TokenKind.AbstractMethodDeclaration)
+        internal AbstractMethodDeclarationSyntaxNode(FunctionOutputDescriptionSyntaxNode? outputDescription, CompoundNameExpressionSyntaxNode name, FunctionInputDescriptionSyntaxNode? inputDescription): base(TokenKind.AbstractMethodDeclaration)
         {
             Slots = 3;
             this.AdjustWidth(outputDescription);
@@ -1955,7 +1993,7 @@ namespace Parser.Internal
             _inputDescription = inputDescription;
         }
 
-        internal AbstractMethodDeclarationSyntaxNode(FunctionOutputDescriptionSyntaxNode? outputDescription, CompoundNameSyntaxNode name, FunctionInputDescriptionSyntaxNode? inputDescription, TokenDiagnostic[] diagnostics): base(TokenKind.AbstractMethodDeclaration, diagnostics)
+        internal AbstractMethodDeclarationSyntaxNode(FunctionOutputDescriptionSyntaxNode? outputDescription, CompoundNameExpressionSyntaxNode name, FunctionInputDescriptionSyntaxNode? inputDescription, TokenDiagnostic[] diagnostics): base(TokenKind.AbstractMethodDeclaration, diagnostics)
         {
             Slots = 3;
             this.AdjustWidth(outputDescription);
@@ -2140,11 +2178,11 @@ namespace Parser.Internal
     {
         internal readonly SyntaxToken _classdefKeyword;
         internal readonly AttributeListSyntaxNode? _attributes;
-        internal readonly IdentifierNameSyntaxNode _className;
+        internal readonly SyntaxToken _className;
         internal readonly BaseClassListSyntaxNode? _baseClassList;
         internal readonly SyntaxList _nodes;
         internal readonly SyntaxToken _endKeyword;
-        internal ClassDeclarationSyntaxNode(SyntaxToken classdefKeyword, AttributeListSyntaxNode? attributes, IdentifierNameSyntaxNode className, BaseClassListSyntaxNode? baseClassList, SyntaxList nodes, SyntaxToken endKeyword): base(TokenKind.ClassDeclaration)
+        internal ClassDeclarationSyntaxNode(SyntaxToken classdefKeyword, AttributeListSyntaxNode? attributes, SyntaxToken className, BaseClassListSyntaxNode? baseClassList, SyntaxList nodes, SyntaxToken endKeyword): base(TokenKind.ClassDeclaration)
         {
             Slots = 6;
             this.AdjustWidth(classdefKeyword);
@@ -2161,7 +2199,7 @@ namespace Parser.Internal
             _endKeyword = endKeyword;
         }
 
-        internal ClassDeclarationSyntaxNode(SyntaxToken classdefKeyword, AttributeListSyntaxNode? attributes, IdentifierNameSyntaxNode className, BaseClassListSyntaxNode? baseClassList, SyntaxList nodes, SyntaxToken endKeyword, TokenDiagnostic[] diagnostics): base(TokenKind.ClassDeclaration, diagnostics)
+        internal ClassDeclarationSyntaxNode(SyntaxToken classdefKeyword, AttributeListSyntaxNode? attributes, SyntaxToken className, BaseClassListSyntaxNode? baseClassList, SyntaxList nodes, SyntaxToken endKeyword, TokenDiagnostic[] diagnostics): base(TokenKind.ClassDeclaration, diagnostics)
         {
             Slots = 6;
             this.AdjustWidth(classdefKeyword);
@@ -2249,10 +2287,10 @@ namespace Parser.Internal
 
     internal class EnumerationItemSyntaxNode : SyntaxNode
     {
-        internal readonly IdentifierNameSyntaxNode _name;
+        internal readonly SyntaxToken _name;
         internal readonly EnumerationItemValueSyntaxNode? _values;
         internal readonly SyntaxList<SyntaxToken> _commas;
-        internal EnumerationItemSyntaxNode(IdentifierNameSyntaxNode name, EnumerationItemValueSyntaxNode? values, SyntaxList<SyntaxToken> commas): base(TokenKind.EnumerationItem)
+        internal EnumerationItemSyntaxNode(SyntaxToken name, EnumerationItemValueSyntaxNode? values, SyntaxList<SyntaxToken> commas): base(TokenKind.EnumerationItem)
         {
             Slots = 3;
             this.AdjustWidth(name);
@@ -2263,7 +2301,7 @@ namespace Parser.Internal
             _commas = commas;
         }
 
-        internal EnumerationItemSyntaxNode(IdentifierNameSyntaxNode name, EnumerationItemValueSyntaxNode? values, SyntaxList<SyntaxToken> commas, TokenDiagnostic[] diagnostics): base(TokenKind.EnumerationItem, diagnostics)
+        internal EnumerationItemSyntaxNode(SyntaxToken name, EnumerationItemValueSyntaxNode? values, SyntaxList<SyntaxToken> commas, TokenDiagnostic[] diagnostics): base(TokenKind.EnumerationItem, diagnostics)
         {
             Slots = 3;
             this.AdjustWidth(name);

Parser/Internal/SyntaxNode.cs

@@ -79,13 +79,13 @@ namespace Parser.Internal
         }
     }
 
-    internal abstract class FunctionHandleSyntaxNode : ExpressionSyntaxNode
+    internal abstract class FunctionHandleExpressionSyntaxNode : ExpressionSyntaxNode
     {
-        protected FunctionHandleSyntaxNode(TokenKind kind) : base(kind)
+        protected FunctionHandleExpressionSyntaxNode(TokenKind kind) : base(kind)
         {
         }
 
-        protected FunctionHandleSyntaxNode(TokenKind kind, TokenDiagnostic[] diagnostics) : base(kind, diagnostics)
+        protected FunctionHandleExpressionSyntaxNode(TokenKind kind, TokenDiagnostic[] diagnostics) : base(kind, diagnostics)
         {
         }
     }

Parser/Internal/SyntaxToken.cs

@@ -116,6 +116,7 @@ namespace Parser.Internal
                 _fullWidth = text?.Length ?? 0;
             }
 
+
             public override void WriteTokenTo(TextWriter writer, bool leading, bool trailing)
             {
                 writer.Write(_text);
@@ -126,7 +127,9 @@ namespace Parser.Internal
                 return new SyntaxTokenWithValue<T>(Kind, _text, _value, diagnostics);
             }
 
-            public T Value => _value;
+            public T TypedValue => _value;
+
+            public override object? Value => TypedValue;
         }
 
         internal class SyntaxTokenWithValueAndTrivia<T> : SyntaxTokenWithValue<T>
@@ -181,7 +184,7 @@ namespace Parser.Internal
 
             public override GreenNode SetDiagnostics(TokenDiagnostic[] diagnostics)
             {
-                return new SyntaxTokenWithValueAndTrivia<T>(Kind, _text, Value, LeadingTrivia, TrailingTrivia, diagnostics);
+                return new SyntaxTokenWithValueAndTrivia<T>(Kind, _text, TypedValue, LeadingTrivia, TrailingTrivia, diagnostics);
             }
         }
 
@@ -311,6 +314,10 @@ namespace Parser.Internal
 
         internal static SyntaxToken NoneToken => new MissingTokenWithTrivia(TokenKind.None, s_EmptySyntaxTriviaList, s_EmptySyntaxTriviaList);
 
+        public virtual object? Value => null;
+
+        public override object? GetValue() => Value;
+
         public virtual int Width => Text.Length;
 
         public override IReadOnlyList<SyntaxTrivia> LeadingTriviaCore => s_EmptySyntaxTriviaList;

Parser/Lowering/Lowerer.cs

@@ -0,0 +1,116 @@
+using Parser.Binding;
+using System.Collections;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+using static Parser.Binding.BoundNodeFactory;
+
+namespace Parser.Lowering
+{
+    internal class Lowerer : BoundTreeRewriter
+    {
+        private int _labelNumber = 0;
+
+        private Lowerer()
+        {
+        }
+
+        private BoundLabel GenerateLabel()
+        {
+            var name = $"Label{++_labelNumber}";
+            return new BoundLabel(name);
+        }
+
+        public override BoundStatement RewriteIfStatement(BoundIfStatement node)
+        {
+            // if cond
+            //     body
+            // elseif cond1
+            //     body1
+            // elseif cond2
+            //     body2
+            // else
+            //     body3
+            //
+            // gotoFalse cond Label1
+            // body
+            // goto LabelEnd
+            // Label1:
+            // gotoFalse cond1 Label2
+            // body1
+            // goto LabelEnd
+            // Label2:
+            // gotoFalse cond2 Label3
+            // body2
+            // goto LabelEnd
+            // Label3:
+            // body3
+            // LabelEnd:
+
+            var builder = ImmutableArray.CreateBuilder<BoundStatement>();
+            var numberOfLabelsNeeded = 1 + node.ElseifClauses.Length + (node.ElseClause is null ? 0 : 1);
+            var labels = new BoundLabel[numberOfLabelsNeeded];
+            for (var i = 0; i < numberOfLabelsNeeded; i++)
+            {
+                labels[i] = GenerateLabel();
+            }
+
+            builder.Add(GotoIfFalse(node.Syntax, node.Condition, labels[0]));
+            builder.Add(node.Body);
+            if (numberOfLabelsNeeded >= 2)
+            {
+                var counter = 0;
+                foreach (var elseifClause in node.ElseifClauses)
+                {
+                    builder.Add(Goto(node.Syntax, labels[^1]));
+                    builder.Add(LabelStatement(node.Syntax, labels[counter]));
+                    counter++;
+                    builder.Add(GotoIfFalse(node.Syntax, elseifClause.Condition, labels[counter]));
+                    builder.Add(elseifClause.Body);
+                }
+                if (node.ElseClause is { } elseClause)
+                {
+                    builder.Add(Goto(node.Syntax, labels[^1]));
+                    builder.Add(LabelStatement(node.Syntax, labels[counter]));
+                    builder.Add(elseClause);
+                }
+            }
+
+            builder.Add(LabelStatement(node.Syntax, labels[^1]));
+            return RewriteBlockStatement(Block(node.Syntax, builder.ToArray()));
+        }
+
+        public static BoundBlockStatement Lower(BoundStatement statement)
+        {
+            var lowerer = new Lowerer();
+            var result = lowerer.RewriteStatement(statement);
+            var flatResult = lowerer.Flatten(result);
+            return flatResult;
+        }
+
+        private BoundBlockStatement Flatten(BoundStatement statement)
+        {
+            var builder = ImmutableArray.CreateBuilder<BoundStatement>();
+            var stack = new Stack<BoundStatement>();
+
+            stack.Push(statement);
+            while (stack.Count() > 0)
+            {
+                var current = stack.Pop();
+                if (current is BoundBlockStatement block)
+                {
+                    foreach (var s in block.Statements.Reverse())
+                    {
+                        stack.Push(s);
+                    }
+                }
+                else
+                {
+                    builder.Add(current);
+                }
+            }
+
+            return Block(statement.Syntax, builder.ToImmutable());
+        }
+    }
+}

Parser/MFunctions/MOperations.cs

@@ -0,0 +1,105 @@
+using Parser.Objects;
+
+namespace Parser.MFunctions
+{
+    public static class MOperations
+    {
+        public static MObject? Plus(MObject left, MObject right)
+        {
+            if (left is MDoubleNumber { Value: var lValue }
+                && right is MDoubleNumber { Value: var rValue })
+            {
+                return MObject.CreateDoubleNumber(lValue + rValue);
+            }
+
+            return null;
+        }
+
+        public static MObject? Minus(MObject left, MObject right)
+        {
+            if (left is MDoubleNumber { Value: var lValue }
+                && right is MDoubleNumber { Value: var rValue })
+            {
+                return MObject.CreateDoubleNumber(lValue - rValue);
+            }
+
+            return null;
+        }
+
+        public static MObject? Star(MObject left, MObject right)
+        {
+            if (left is MDoubleNumber { Value: var lValue }
+                && right is MDoubleNumber { Value: var rValue })
+            {
+                return MObject.CreateDoubleNumber(lValue * rValue);
+            }
+
+            return null;
+        }
+
+        public static MObject? Slash(MObject left, MObject right)
+        {
+            if (left is MDoubleNumber { Value: var lValue }
+                && right is MDoubleNumber { Value: var rValue })
+            {
+                return MObject.CreateDoubleNumber(lValue / rValue);
+            }
+
+            return null;
+        }
+
+        public static MObject? Greater(MObject left, MObject right)
+        {
+            if (left is MDoubleNumber { Value: var lValue }
+                && right is MDoubleNumber { Value: var rValue })
+            {
+                return MObject.CreateLogical(lValue > rValue);
+            }
+
+            return null;
+        }
+
+        public static MObject? GreaterOrEquals(MObject left, MObject right)
+        {
+            if (left is MDoubleNumber { Value: var lValue }
+                && right is MDoubleNumber { Value: var rValue })
+            {
+                return MObject.CreateLogical(lValue >= rValue);
+            }
+
+            return null;
+        }
+
+        public static MObject? Less(MObject left, MObject right)
+        {
+            if (left is MDoubleNumber { Value: var lValue }
+                && right is MDoubleNumber { Value: var rValue })
+            {
+                return MObject.CreateLogical(lValue < rValue);
+            }
+
+            return null;
+        }
+
+        public static MObject? LessOrEquals(MObject left, MObject right)
+        {
+            if (left is MDoubleNumber { Value: var lValue }
+                && right is MDoubleNumber { Value: var rValue })
+            {
+                return MObject.CreateLogical(lValue <= rValue);
+            }
+
+            return null;
+        }
+
+        public static MObject? Minus(MObject operand)
+        {
+            if (operand is MDoubleNumber { Value: var value })
+            {
+                return MObject.CreateDoubleNumber(-value);
+            }
+
+            return null;
+        }
+    }
+}

Parser/MParser.cs

@@ -1,6 +1,4 @@
-using System;
-using System.Collections.Generic;
-using Parser.Internal;
+using Parser.Internal;
 using System.Linq;
 
 namespace Parser
@@ -27,18 +25,4 @@ namespace Parser
             return new SyntaxTree(root, totalDiagnostics);
         }
     }
-
-    public class SyntaxTree
-    {
-        public SyntaxTree(RootSyntaxNode nullRoot, DiagnosticsBag diagnostics)
-        {
-            NullRoot = nullRoot ?? throw new ArgumentNullException(nameof(nullRoot));
-            Diagnostics = diagnostics ?? throw new ArgumentNullException(nameof(diagnostics));
-        }
-
-        public RootSyntaxNode NullRoot { get; }
-        public FileSyntaxNode Root => NullRoot.File;
-        public DiagnosticsBag Diagnostics { get; }
-    }
-
 }

Parser/Objects/MCharArray.cs

@@ -0,0 +1,22 @@
+namespace Parser.Objects
+{
+    public class MCharArray : MObject
+    {
+        private MCharArray(char[] chars)
+        {
+            Chars = chars;
+        }
+
+        public char[] Chars { get; }
+
+        public static MCharArray Create(char[] chars)
+        {
+            return new MCharArray(chars);
+        }
+
+        public override string ToString()
+        {
+            return new string(Chars);
+        }
+    }
+}

Parser/Objects/MDoubleNumber.cs

@@ -0,0 +1,24 @@
+using System.Globalization;
+
+namespace Parser.Objects
+{
+    public class MDoubleNumber : MObject
+    {
+        private MDoubleNumber(double value)
+        {
+            Value = value;
+        }
+
+        public double Value { get; }
+
+        public static MDoubleNumber Create(double value)
+        {
+            return new MDoubleNumber(value);
+        }
+
+        public override string ToString()
+        {
+            return Value.ToString(CultureInfo.InvariantCulture);
+        }
+    }
+}

Parser/Objects/MLogical.cs

@@ -0,0 +1,24 @@
+using System.Globalization;
+
+namespace Parser.Objects
+{
+    public class MLogical : MObject
+    {
+        public MLogical(bool value)
+        {
+            Value = value;
+        }
+
+        public bool Value { get; }
+
+        public static MLogical Create(bool value)
+        {
+            return new MLogical(value);
+        }
+
+        public override string ToString()
+        {
+            return Value.ToString(CultureInfo.InvariantCulture);
+        }
+    }
+}

Parser/Objects/MObject.cs

@@ -0,0 +1,20 @@
+namespace Parser.Objects
+{
+    public abstract class MObject
+    {
+        public static MDoubleNumber CreateDoubleNumber(double value)
+        {
+            return MDoubleNumber.Create(value);
+        }
+
+        public static MCharArray CreateCharArray(char[] chars)
+        {
+            return MCharArray.Create(chars);
+        }
+
+        public static MLogical CreateLogical(bool value)
+        {
+            return MLogical.Create(value);
+        }
+    }
+}

Parser/Parser.csproj

@@ -3,6 +3,7 @@
     <TargetFramework>netcoreapp3.0</TargetFramework>
     <LangVersion>8.0</LangVersion>
     <Nullable>enable</Nullable>
+    <LangVersion>preview</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="System.Collections.Immutable" Version="1.5.0" />

Parser/SyntaxDefinition.xml

@@ -1,16 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Syntax xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
     <Class Name="FileSyntaxNode" BaseClass="SyntaxNode" Kind="File">
-        <Field Type="SyntaxList" Name="statementList" />
+        <Field Type="BlockStatementSyntaxNode" Name="body" />
         <Field Type="SyntaxToken" Name="endOfFile" />
     </Class>
+    <Class Name="BlockStatementSyntaxNode" BaseClass="StatementSyntaxNode" Kind="BlockStatement">
+        <Field Type="SyntaxList" Name="statements" />
+    </Class>
     <Class Name="FunctionDeclarationSyntaxNode" BaseClass="StatementSyntaxNode" Kind="FunctionDeclaration">
         <Field Type="SyntaxToken" Name="functionKeyword" />
         <Field Type="FunctionOutputDescriptionSyntaxNode" Name="outputDescription" Nullable="true" />
         <Field Type="SyntaxToken" Name="name" />
         <Field Type="FunctionInputDescriptionSyntaxNode" Name="inputDescription" Nullable="true"/>
         <Field Type="SyntaxList&lt;SyntaxToken&gt;" Name="commas" />
-        <Field Type="SyntaxList" Name="body" />
+        <Field Type="StatementSyntaxNode" Name="body" />
         <Field Type="EndKeywordSyntaxNode" Name="endKeyword" Nullable="true"/>
     </Class>
     <Class Name="FunctionOutputDescriptionSyntaxNode" BaseClass="SyntaxNode" Kind="FunctionOutputDescription">
@@ -33,30 +36,30 @@
         <Field Type="SyntaxToken" Name="caseKeyword" />
         <Field Type="ExpressionSyntaxNode" Name="caseIdentifier" />
         <Field Type="SyntaxList&lt;SyntaxToken&gt;" Name="optionalCommas" />
-        <Field Type="SyntaxList" Name="body" />
+        <Field Type="StatementSyntaxNode" Name="body" />
     </Class>
     <Class Name="WhileStatementSyntaxNode" BaseClass="StatementSyntaxNode" Kind="WhileStatement">
         <Field Type="SyntaxToken" Name="whileKeyword" />
         <Field Type="ExpressionSyntaxNode" Name="condition" />
         <Field Type="SyntaxList&lt;SyntaxToken&gt;" Name="optionalCommas" />
-        <Field Type="SyntaxList" Name="body" />
+        <Field Type="StatementSyntaxNode" Name="body" />
         <Field Type="SyntaxToken" Name="endKeyword" />
     </Class>
     <Class Name="ElseifClause" BaseClass="SyntaxNode" Kind="ElseifClause">
         <Field Type="SyntaxToken" Name="elseifKeyword" />
         <Field Type="ExpressionSyntaxNode" Name="condition" />
         <Field Type="SyntaxList&lt;SyntaxToken&gt;" Name="optionalCommas" />
-        <Field Type="SyntaxList" Name="body" />
+        <Field Type="StatementSyntaxNode" Name="body" />
     </Class>
     <Class Name="ElseClause" BaseClass="SyntaxNode" Kind="ElseClause">
         <Field Type="SyntaxToken" Name="elseKeyword" />
-        <Field Type="SyntaxList" Name="body" />
+        <Field Type="StatementSyntaxNode" Name="body" />
     </Class>
     <Class Name="IfStatementSyntaxNode" BaseClass="StatementSyntaxNode" Kind="IfStatement">
         <Field Type="SyntaxToken" Name="ifKeyword" />
         <Field Type="ExpressionSyntaxNode" Name="condition" />
         <Field Type="SyntaxList&lt;SyntaxToken&gt;" Name="optionalCommas" />
-        <Field Type="SyntaxList" Name="body" />
+        <Field Type="StatementSyntaxNode" Name="body" />
         <Field Type="SyntaxList&lt;ElseifClause&gt;" Name="elseifClauses" />
         <Field Type="ElseClause" Name="elseClause" Nullable="true" />
         <Field Type="SyntaxToken" Name="endKeyword" />
@@ -65,7 +68,7 @@
         <Field Type="SyntaxToken" Name="forKeyword" />
         <Field Type="AssignmentExpressionSyntaxNode" Name="assignment" />
         <Field Type="SyntaxList&lt;SyntaxToken&gt;" Name="optionalCommas" />
-        <Field Type="SyntaxList" Name="body" />
+        <Field Type="StatementSyntaxNode" Name="body" />
         <Field Type="SyntaxToken" Name="endKeyword" />
     </Class>
     <Class Name="AssignmentExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="AssignmentExpression">
@@ -79,7 +82,7 @@
     </Class>
     <Class Name="TryCatchStatementSyntaxNode" BaseClass="StatementSyntaxNode" Kind="TryCatchStatement">
         <Field Type="SyntaxToken" Name="tryKeyword" />
-        <Field Type="SyntaxList" Name="tryBody" />
+        <Field Type="StatementSyntaxNode" Name="tryBody" />
         <Field Type="CatchClauseSyntaxNode" Name="catchClause" Nullable="true" />
         <Field Type="SyntaxToken" Name="endKeyword" />
     </Class>
@@ -95,36 +98,36 @@
         <Field Type="SyntaxToken" Name="operation" />
         <Field Type="ExpressionSyntaxNode" Name="operand" />
     </Class>
-    <Class Name="CompoundNameSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="CompoundName">
+    <Class Name="CompoundNameExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="CompoundNameExpression">
         <Field Type="SyntaxList" Name="nodes" />
     </Class>
-    <Class Name="NamedFunctionHandleSyntaxNode" BaseClass="FunctionHandleSyntaxNode" Kind="NamedFunctionHandle">
+    <Class Name="NamedFunctionHandleExpressionSyntaxNode" BaseClass="FunctionHandleExpressionSyntaxNode" Kind="NamedFunctionHandleExpression">
         <Field Type="SyntaxToken" Name="atSign" />
-        <Field Type="CompoundNameSyntaxNode" Name="functionName" />
+        <Field Type="CompoundNameExpressionSyntaxNode" Name="functionName" />
     </Class>
-    <Class Name="LambdaSyntaxNode" BaseClass="FunctionHandleSyntaxNode" Kind="Lambda">
+    <Class Name="LambdaExpressionSyntaxNode" BaseClass="FunctionHandleExpressionSyntaxNode" Kind="LambdaExpression">
         <Field Type="SyntaxToken" Name="atSign" />
         <Field Type="FunctionInputDescriptionSyntaxNode" Name="input" />
         <Field Type="ExpressionSyntaxNode" Name="body" />
     </Class>
-    <Class Name="BinaryOperationExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="BinaryOperation">
+    <Class Name="BinaryOperationExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="BinaryOperationExpression">
         <Field Type="ExpressionSyntaxNode" Name="lhs" />
         <Field Type="SyntaxToken" Name="operation" />
         <Field Type="ExpressionSyntaxNode" Name="rhs" />
     </Class>
-    <Class Name="IdentifierNameSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="IdentifierName">
+    <Class Name="IdentifierNameExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="IdentifierNameExpression">
         <Field Type="SyntaxToken" Name="name" />
     </Class>
-    <Class Name="NumberLiteralSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="NumberLiteralExpression">
+    <Class Name="NumberLiteralExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="NumberLiteralExpression">
         <Field Type="SyntaxToken" Name="number" />
     </Class>
-    <Class Name="StringLiteralSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="StringLiteralExpression">
+    <Class Name="StringLiteralExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="StringLiteralExpression">
         <Field Type="SyntaxToken" Name="stringToken" />
     </Class>
-    <Class Name="DoubleQuotedStringLiteralSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="DoubleQuotedStringLiteralExpression">
+    <Class Name="DoubleQuotedStringLiteralExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="DoubleQuotedStringLiteralExpression">
         <Field Type="SyntaxToken" Name="stringToken" />
     </Class>
-    <Class Name="UnquotedStringLiteralSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="UnquotedStringLiteralExpression">
+    <Class Name="UnquotedStringLiteralExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="UnquotedStringLiteralExpression">
         <Field Type="SyntaxToken" Name="stringToken" />
     </Class>
     <Class Name="ArrayLiteralExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="ArrayLiteralExpression">
@@ -142,37 +145,37 @@
         <Field Type="ExpressionSyntaxNode" Name="expression" />
         <Field Type="SyntaxToken" Name="closingBracket" />
     </Class>
-    <Class Name="CellArrayElementAccessExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="CellArrayElementAccess">
+    <Class Name="CellArrayElementAccessExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="CellArrayElementAccessExpression">
         <Field Type="ExpressionSyntaxNode" Name="expression" />
         <Field Type="SyntaxToken" Name="openingBrace" />
         <Field Type="SyntaxList" Name="nodes" />
         <Field Type="SyntaxToken" Name="closingBrace" />
     </Class>
-    <Class Name="FunctionCallExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="FunctionCall">
+    <Class Name="FunctionCallExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="FunctionCallExpression">
         <Field Type="ExpressionSyntaxNode" Name="functionName" />
         <Field Type="SyntaxToken" Name="openingBracket" />
         <Field Type="SyntaxList" Name="nodes" />
         <Field Type="SyntaxToken" Name="closingBracket" />
     </Class>
-    <Class Name="MemberAccessSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="MemberAccess">
+    <Class Name="MemberAccessExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="MemberAccessExpression">
         <Field Type="SyntaxNode" Name="leftOperand" />
         <Field Type="SyntaxToken" Name="dot" />
         <Field Type="SyntaxNode" Name="rightOperand" />
     </Class>
-    <Class Name="UnaryPostixOperationExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="UnaryPostfixOperationExpression">
+    <Class Name="UnaryPostfixOperationExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="UnaryPostfixOperationExpression">
         <Field Type="ExpressionSyntaxNode" Name="operand" />
         <Field Type="SyntaxToken" Name="operation" />
     </Class>
-    <Class Name="IndirectMemberAccessSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="IndirectMemberAccess">
+    <Class Name="IndirectMemberAccessExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="IndirectMemberAccessExpression">
         <Field Type="SyntaxToken" Name="openingBracket" />
         <Field Type="ExpressionSyntaxNode" Name="expression" />
         <Field Type="SyntaxToken" Name="closingBracket" />
     </Class>
-    <Class Name="CommandExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="Command">
-        <Field Type="IdentifierNameSyntaxNode" Name="commandName" />
-        <Field Type="SyntaxList&lt;UnquotedStringLiteralSyntaxNode&gt;" Name="arguments" />
+    <Class Name="CommandExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="CommandExpression">
+        <Field Type="SyntaxToken" Name="commandName" />
+        <Field Type="SyntaxList&lt;UnquotedStringLiteralExpressionSyntaxNode&gt;" Name="arguments" />
     </Class>
-    <Class Name="BaseClassInvokationSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="ClassInvokation">
+    <Class Name="ClassInvokationExpressionSyntaxNode" BaseClass="ExpressionSyntaxNode" Kind="ClassInvokationExpression">
         <Field Type="ExpressionSyntaxNode" Name="methodName" />
         <Field Type="SyntaxToken" Name="atSign" />
         <Field Type="ExpressionSyntaxNode" Name="baseClassNameAndArguments" />
@@ -182,7 +185,7 @@
         <Field Type="ExpressionSyntaxNode" Name="value" />
     </Class>
     <Class Name="AttributeSyntaxNode" BaseClass="SyntaxNode" Kind="Attribute">
-        <Field Type="IdentifierNameSyntaxNode" Name="name" />
+        <Field Type="SyntaxToken" Name="name" />
         <Field Type="AttributeAssignmentSyntaxNode" Name="assignment" Nullable="true" />
     </Class>
     <Class Name="AttributeListSyntaxNode" BaseClass="SyntaxNode" Kind="AttributeList">
@@ -190,18 +193,18 @@
         <Field Type="SyntaxList" Name="nodes" />
         <Field Type="SyntaxToken" Name="closingBracket" />
     </Class>
-    <Class Name="MethodDefinitionSyntaxNode" BaseClass="MethodDeclarationSyntaxNode" Kind="MethodDefinition">
+    <Class Name="ConcreteMethodDeclarationSyntaxNode" BaseClass="MethodDeclarationSyntaxNode" Kind="ConcreteMethodDeclaration">
         <Field Type="SyntaxToken" Name="functionKeyword" />
         <Field Type="FunctionOutputDescriptionSyntaxNode" Name="outputDescription" Nullable="true" />
-        <Field Type="CompoundNameSyntaxNode" Name="name" />
+        <Field Type="CompoundNameExpressionSyntaxNode" Name="name" />
         <Field Type="FunctionInputDescriptionSyntaxNode" Name="inputDescription" Nullable="true"/>
         <Field Type="SyntaxList&lt;SyntaxToken&gt;" Name="commas" />
-        <Field Type="SyntaxList" Name="body" />
+        <Field Type="StatementSyntaxNode" Name="body" />
         <Field Type="EndKeywordSyntaxNode" Name="endKeyword" Nullable="true" />
     </Class>
     <Class Name="AbstractMethodDeclarationSyntaxNode" BaseClass="MethodDeclarationSyntaxNode" Kind="AbstractMethodDeclaration">
         <Field Type="FunctionOutputDescriptionSyntaxNode" Name="outputDescription" Nullable="true" />
-        <Field Type="CompoundNameSyntaxNode" Name="name" />
+        <Field Type="CompoundNameExpressionSyntaxNode" Name="name" />
         <Field Type="FunctionInputDescriptionSyntaxNode" Name="inputDescription" Nullable="true"/>
     </Class>
     <Class Name="MethodsListSyntaxNode" BaseClass="SyntaxNode" Kind="MethodsList">
@@ -223,7 +226,7 @@
     <Class Name="ClassDeclarationSyntaxNode" BaseClass="StatementSyntaxNode" Kind="ClassDeclaration">
         <Field Type="SyntaxToken" Name="classdefKeyword" />
         <Field Type="AttributeListSyntaxNode" Name="attributes" Nullable="true" />
-        <Field Type="IdentifierNameSyntaxNode" Name="className" />
+        <Field Type="SyntaxToken" Name="className" />
         <Field Type="BaseClassListSyntaxNode" Name="baseClassList" Nullable="true" />
         <Field Type="SyntaxList" Name="nodes" />
         <Field Type="SyntaxToken" Name="endKeyword" />
@@ -234,7 +237,7 @@
         <Field Type="SyntaxToken" Name="closingBracket" />
     </Class>
     <Class Name="EnumerationItemSyntaxNode" BaseClass="SyntaxNode" Kind="EnumerationItem">
-        <Field Type="IdentifierNameSyntaxNode" Name="name" />
+        <Field Type="SyntaxToken" Name="name" />
         <Field Type="EnumerationItemValueSyntaxNode" Name="values" Nullable="true"/>
         <Field Type="SyntaxList&lt;SyntaxToken&gt;" Name="commas" />
     </Class>

Parser/SyntaxNode.Generated.cs

@@ -3,7 +3,7 @@ namespace Parser
 {
     public class FileSyntaxNode : SyntaxNode
     {
-        private SyntaxNode? _statementList;
+        private SyntaxNode? _body;
         internal FileSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
@@ -16,12 +16,12 @@ namespace Parser
             }
         }
 
-        public SyntaxNodeOrTokenList StatementList
+        public BlockStatementSyntaxNode Body
         {
             get
             {
-                var red = this.GetRed(ref this._statementList!, 0);
-                return red is null ? throw new System.Exception("statementList cannot be null.") : (SyntaxNodeOrTokenList)red;
+                var red = this.GetRed(ref this._body!, 0);
+                return red is null ? throw new System.Exception("body cannot be null.") : (BlockStatementSyntaxNode)red;
             }
         }
 
@@ -29,7 +29,7 @@ namespace Parser
         {
             return i switch
             {
-            0 => GetRed(ref _statementList!, 0), _ => null
+            0 => GetRed(ref _body!, 0), _ => null
             }
 
             ;
@@ -41,6 +41,38 @@ namespace Parser
         }
     }
 
+    public class BlockStatementSyntaxNode : StatementSyntaxNode
+    {
+        private SyntaxNode? _statements;
+        internal BlockStatementSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
+        {
+        }
+
+        public SyntaxNodeOrTokenList Statements
+        {
+            get
+            {
+                var red = this.GetRed(ref this._statements!, 0);
+                return red is null ? throw new System.Exception("statements cannot be null.") : (SyntaxNodeOrTokenList)red;
+            }
+        }
+
+        internal override SyntaxNode? GetNode(int i)
+        {
+            return i switch
+            {
+            0 => GetRed(ref _statements!, 0), _ => null
+            }
+
+            ;
+        }
+
+        public override void Accept(SyntaxVisitor visitor)
+        {
+            visitor.VisitBlockStatement(this);
+        }
+    }
+
     public class FunctionDeclarationSyntaxNode : StatementSyntaxNode
     {
         private SyntaxNode? _outputDescription;
@@ -95,12 +127,12 @@ namespace Parser
             }
         }
 
-        public SyntaxNodeOrTokenList Body
+        public StatementSyntaxNode Body
         {
             get
             {
                 var red = this.GetRed(ref this._body!, 5);
-                return red is null ? throw new System.Exception("body cannot be null.") : (SyntaxNodeOrTokenList)red;
+                return red is null ? throw new System.Exception("body cannot be null.") : (StatementSyntaxNode)red;
             }
         }
 
@@ -320,12 +352,12 @@ namespace Parser
             }
         }
 
-        public SyntaxNodeOrTokenList Body
+        public StatementSyntaxNode Body
         {
             get
             {
                 var red = this.GetRed(ref this._body!, 3);
-                return red is null ? throw new System.Exception("body cannot be null.") : (SyntaxNodeOrTokenList)red;
+                return red is null ? throw new System.Exception("body cannot be null.") : (StatementSyntaxNode)red;
             }
         }
 
@@ -388,12 +420,12 @@ namespace Parser
             }
         }
 
-        public SyntaxNodeOrTokenList Body
+        public StatementSyntaxNode Body
         {
             get
             {
                 var red = this.GetRed(ref this._body!, 3);
-                return red is null ? throw new System.Exception("body cannot be null.") : (SyntaxNodeOrTokenList)red;
+                return red is null ? throw new System.Exception("body cannot be null.") : (StatementSyntaxNode)red;
             }
         }
 
@@ -448,12 +480,12 @@ namespace Parser
             }
         }
 
-        public SyntaxNodeOrTokenList Body
+        public StatementSyntaxNode Body
         {
             get
             {
                 var red = this.GetRed(ref this._body!, 3);
-                return red is null ? throw new System.Exception("body cannot be null.") : (SyntaxNodeOrTokenList)red;
+                return red is null ? throw new System.Exception("body cannot be null.") : (StatementSyntaxNode)red;
             }
         }
 
@@ -488,12 +520,12 @@ namespace Parser
             }
         }
 
-        public SyntaxNodeOrTokenList Body
+        public StatementSyntaxNode Body
         {
             get
             {
                 var red = this.GetRed(ref this._body!, 1);
-                return red is null ? throw new System.Exception("body cannot be null.") : (SyntaxNodeOrTokenList)red;
+                return red is null ? throw new System.Exception("body cannot be null.") : (StatementSyntaxNode)red;
             }
         }
 
@@ -558,12 +590,12 @@ namespace Parser
             }
         }
 
-        public SyntaxNodeOrTokenList Body
+        public StatementSyntaxNode Body
         {
             get
             {
                 var red = this.GetRed(ref this._body!, 3);
-                return red is null ? throw new System.Exception("body cannot be null.") : (SyntaxNodeOrTokenList)red;
+                return red is null ? throw new System.Exception("body cannot be null.") : (StatementSyntaxNode)red;
             }
         }
 
@@ -644,12 +676,12 @@ namespace Parser
             }
         }
 
-        public SyntaxNodeOrTokenList Body
+        public StatementSyntaxNode Body
         {
             get
             {
                 var red = this.GetRed(ref this._body!, 3);
-                return red is null ? throw new System.Exception("body cannot be null.") : (SyntaxNodeOrTokenList)red;
+                return red is null ? throw new System.Exception("body cannot be null.") : (StatementSyntaxNode)red;
             }
         }
 
@@ -783,12 +815,12 @@ namespace Parser
             }
         }
 
-        public SyntaxNodeOrTokenList TryBody
+        public StatementSyntaxNode TryBody
         {
             get
             {
                 var red = this.GetRed(ref this._tryBody!, 1);
-                return red is null ? throw new System.Exception("tryBody cannot be null.") : (SyntaxNodeOrTokenList)red;
+                return red is null ? throw new System.Exception("tryBody cannot be null.") : (StatementSyntaxNode)red;
             }
         }
 
@@ -941,10 +973,10 @@ namespace Parser
         }
     }
 
-    public class CompoundNameSyntaxNode : ExpressionSyntaxNode
+    public class CompoundNameExpressionSyntaxNode : ExpressionSyntaxNode
     {
         private SyntaxNode? _nodes;
-        internal CompoundNameSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
+        internal CompoundNameExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
@@ -969,14 +1001,14 @@ namespace Parser
 
         public override void Accept(SyntaxVisitor visitor)
         {
-            visitor.VisitCompoundName(this);
+            visitor.VisitCompoundNameExpression(this);
         }
     }
 
-    public class NamedFunctionHandleSyntaxNode : FunctionHandleSyntaxNode
+    public class NamedFunctionHandleExpressionSyntaxNode : FunctionHandleExpressionSyntaxNode
     {
         private SyntaxNode? _functionName;
-        internal NamedFunctionHandleSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
+        internal NamedFunctionHandleExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
@@ -984,16 +1016,16 @@ namespace Parser
         {
             get
             {
-                return new SyntaxToken(this, ((Parser.Internal.NamedFunctionHandleSyntaxNode)_green)._atSign, this.GetChildPosition(0));
+                return new SyntaxToken(this, ((Parser.Internal.NamedFunctionHandleExpressionSyntaxNode)_green)._atSign, this.GetChildPosition(0));
             }
         }
 
-        public CompoundNameSyntaxNode FunctionName
+        public CompoundNameExpressionSyntaxNode FunctionName
         {
             get
             {
                 var red = this.GetRed(ref this._functionName!, 1);
-                return red is null ? throw new System.Exception("functionName cannot be null.") : (CompoundNameSyntaxNode)red;
+                return red is null ? throw new System.Exception("functionName cannot be null.") : (CompoundNameExpressionSyntaxNode)red;
             }
         }
 
@@ -1009,15 +1041,15 @@ namespace Parser
 
         public override void Accept(SyntaxVisitor visitor)
         {
-            visitor.VisitNamedFunctionHandle(this);
+            visitor.VisitNamedFunctionHandleExpression(this);
         }
     }
 
-    public class LambdaSyntaxNode : FunctionHandleSyntaxNode
+    public class LambdaExpressionSyntaxNode : FunctionHandleExpressionSyntaxNode
     {
         private SyntaxNode? _input;
         private SyntaxNode? _body;
-        internal LambdaSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
+        internal LambdaExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
@@ -1025,7 +1057,7 @@ namespace Parser
         {
             get
             {
-                return new SyntaxToken(this, ((Parser.Internal.LambdaSyntaxNode)_green)._atSign, this.GetChildPosition(0));
+                return new SyntaxToken(this, ((Parser.Internal.LambdaExpressionSyntaxNode)_green)._atSign, this.GetChildPosition(0));
             }
         }
 
@@ -1059,7 +1091,7 @@ namespace Parser
 
         public override void Accept(SyntaxVisitor visitor)
         {
-            visitor.VisitLambda(this);
+            visitor.VisitLambdaExpression(this);
         }
     }
 
@@ -1113,9 +1145,9 @@ namespace Parser
         }
     }
 
-    public class IdentifierNameSyntaxNode : ExpressionSyntaxNode
+    public class IdentifierNameExpressionSyntaxNode : ExpressionSyntaxNode
     {
-        internal IdentifierNameSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
+        internal IdentifierNameExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
@@ -1123,7 +1155,7 @@ namespace Parser
         {
             get
             {
-                return new SyntaxToken(this, ((Parser.Internal.IdentifierNameSyntaxNode)_green)._name, this.GetChildPosition(0));
+                return new SyntaxToken(this, ((Parser.Internal.IdentifierNameExpressionSyntaxNode)_green)._name, this.GetChildPosition(0));
             }
         }
 
@@ -1139,13 +1171,13 @@ namespace Parser
 
         public override void Accept(SyntaxVisitor visitor)
         {
-            visitor.VisitIdentifierName(this);
+            visitor.VisitIdentifierNameExpression(this);
         }
     }
 
-    public class NumberLiteralSyntaxNode : ExpressionSyntaxNode
+    public class NumberLiteralExpressionSyntaxNode : ExpressionSyntaxNode
     {
-        internal NumberLiteralSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
+        internal NumberLiteralExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
@@ -1153,7 +1185,7 @@ namespace Parser
         {
             get
             {
-                return new SyntaxToken(this, ((Parser.Internal.NumberLiteralSyntaxNode)_green)._number, this.GetChildPosition(0));
+                return new SyntaxToken(this, ((Parser.Internal.NumberLiteralExpressionSyntaxNode)_green)._number, this.GetChildPosition(0));
             }
         }
 
@@ -1169,13 +1201,13 @@ namespace Parser
 
         public override void Accept(SyntaxVisitor visitor)
         {
-            visitor.VisitNumberLiteral(this);
+            visitor.VisitNumberLiteralExpression(this);
         }
     }
 
-    public class StringLiteralSyntaxNode : ExpressionSyntaxNode
+    public class StringLiteralExpressionSyntaxNode : ExpressionSyntaxNode
     {
-        internal StringLiteralSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
+        internal StringLiteralExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
@@ -1183,7 +1215,7 @@ namespace Parser
         {
             get
             {
-                return new SyntaxToken(this, ((Parser.Internal.StringLiteralSyntaxNode)_green)._stringToken, this.GetChildPosition(0));
+                return new SyntaxToken(this, ((Parser.Internal.StringLiteralExpressionSyntaxNode)_green)._stringToken, this.GetChildPosition(0));
             }
         }
 
@@ -1199,13 +1231,13 @@ namespace Parser
 
         public override void Accept(SyntaxVisitor visitor)
         {
-            visitor.VisitStringLiteral(this);
+            visitor.VisitStringLiteralExpression(this);
         }
     }
 
-    public class DoubleQuotedStringLiteralSyntaxNode : ExpressionSyntaxNode
+    public class DoubleQuotedStringLiteralExpressionSyntaxNode : ExpressionSyntaxNode
     {
-        internal DoubleQuotedStringLiteralSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
+        internal DoubleQuotedStringLiteralExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
@@ -1213,7 +1245,7 @@ namespace Parser
         {
             get
             {
-                return new SyntaxToken(this, ((Parser.Internal.DoubleQuotedStringLiteralSyntaxNode)_green)._stringToken, this.GetChildPosition(0));
+                return new SyntaxToken(this, ((Parser.Internal.DoubleQuotedStringLiteralExpressionSyntaxNode)_green)._stringToken, this.GetChildPosition(0));
             }
         }
 
@@ -1229,13 +1261,13 @@ namespace Parser
 
         public override void Accept(SyntaxVisitor visitor)
         {
-            visitor.VisitDoubleQuotedStringLiteral(this);
+            visitor.VisitDoubleQuotedStringLiteralExpression(this);
         }
     }
 
-    public class UnquotedStringLiteralSyntaxNode : ExpressionSyntaxNode
+    public class UnquotedStringLiteralExpressionSyntaxNode : ExpressionSyntaxNode
     {
-        internal UnquotedStringLiteralSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
+        internal UnquotedStringLiteralExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
@@ -1243,7 +1275,7 @@ namespace Parser
         {
             get
             {
-                return new SyntaxToken(this, ((Parser.Internal.UnquotedStringLiteralSyntaxNode)_green)._stringToken, this.GetChildPosition(0));
+                return new SyntaxToken(this, ((Parser.Internal.UnquotedStringLiteralExpressionSyntaxNode)_green)._stringToken, this.GetChildPosition(0));
             }
         }
 
@@ -1259,7 +1291,7 @@ namespace Parser
 
         public override void Accept(SyntaxVisitor visitor)
         {
-            visitor.VisitUnquotedStringLiteral(this);
+            visitor.VisitUnquotedStringLiteralExpression(this);
         }
     }
 
@@ -1523,11 +1555,11 @@ namespace Parser
         }
     }
 
-    public class MemberAccessSyntaxNode : ExpressionSyntaxNode
+    public class MemberAccessExpressionSyntaxNode : ExpressionSyntaxNode
     {
         private SyntaxNode? _leftOperand;
         private SyntaxNode? _rightOperand;
-        internal MemberAccessSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
+        internal MemberAccessExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
@@ -1535,7 +1567,7 @@ namespace Parser
         {
             get
             {
-                return new SyntaxToken(this, ((Parser.Internal.MemberAccessSyntaxNode)_green)._dot, this.GetChildPosition(1));
+                return new SyntaxToken(this, ((Parser.Internal.MemberAccessExpressionSyntaxNode)_green)._dot, this.GetChildPosition(1));
             }
         }
 
@@ -1569,14 +1601,14 @@ namespace Parser
 
         public override void Accept(SyntaxVisitor visitor)
         {
-            visitor.VisitMemberAccess(this);
+            visitor.VisitMemberAccessExpression(this);
         }
     }
 
-    public class UnaryPostixOperationExpressionSyntaxNode : ExpressionSyntaxNode
+    public class UnaryPostfixOperationExpressionSyntaxNode : ExpressionSyntaxNode
     {
         private SyntaxNode? _operand;
-        internal UnaryPostixOperationExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
+        internal UnaryPostfixOperationExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
@@ -1584,7 +1616,7 @@ namespace Parser
         {
             get
             {
-                return new SyntaxToken(this, ((Parser.Internal.UnaryPostixOperationExpressionSyntaxNode)_green)._operation, this.GetChildPosition(1));
+                return new SyntaxToken(this, ((Parser.Internal.UnaryPostfixOperationExpressionSyntaxNode)_green)._operation, this.GetChildPosition(1));
             }
         }
 
@@ -1609,14 +1641,14 @@ namespace Parser
 
         public override void Accept(SyntaxVisitor visitor)
         {
-            visitor.VisitUnaryPostixOperationExpression(this);
+            visitor.VisitUnaryPostfixOperationExpression(this);
         }
     }
 
-    public class IndirectMemberAccessSyntaxNode : ExpressionSyntaxNode
+    public class IndirectMemberAccessExpressionSyntaxNode : ExpressionSyntaxNode
     {
         private SyntaxNode? _expression;
-        internal IndirectMemberAccessSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
+        internal IndirectMemberAccessExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
@@ -1624,7 +1656,7 @@ namespace Parser
         {
             get
             {
-                return new SyntaxToken(this, ((Parser.Internal.IndirectMemberAccessSyntaxNode)_green)._openingBracket, this.GetChildPosition(0));
+                return new SyntaxToken(this, ((Parser.Internal.IndirectMemberAccessExpressionSyntaxNode)_green)._openingBracket, this.GetChildPosition(0));
             }
         }
 
@@ -1632,7 +1664,7 @@ namespace Parser
         {
             get
             {
-                return new SyntaxToken(this, ((Parser.Internal.IndirectMemberAccessSyntaxNode)_green)._closingBracket, this.GetChildPosition(2));
+                return new SyntaxToken(this, ((Parser.Internal.IndirectMemberAccessExpressionSyntaxNode)_green)._closingBracket, this.GetChildPosition(2));
             }
         }
 
@@ -1657,24 +1689,22 @@ namespace Parser
 
         public override void Accept(SyntaxVisitor visitor)
         {
-            visitor.VisitIndirectMemberAccess(this);
+            visitor.VisitIndirectMemberAccessExpression(this);
         }
     }
 
     public class CommandExpressionSyntaxNode : ExpressionSyntaxNode
     {
-        private SyntaxNode? _commandName;
         private SyntaxNode? _arguments;
         internal CommandExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
-        public IdentifierNameSyntaxNode CommandName
+        public SyntaxToken CommandName
         {
             get
             {
-                var red = this.GetRed(ref this._commandName!, 0);
-                return red is null ? throw new System.Exception("commandName cannot be null.") : (IdentifierNameSyntaxNode)red;
+                return new SyntaxToken(this, ((Parser.Internal.CommandExpressionSyntaxNode)_green)._commandName, this.GetChildPosition(0));
             }
         }
 
@@ -1691,7 +1721,7 @@ namespace Parser
         {
             return i switch
             {
-            0 => GetRed(ref _commandName!, 0), 1 => GetRed(ref _arguments!, 1), _ => null
+            1 => GetRed(ref _arguments!, 1), _ => null
             }
 
             ;
@@ -1703,11 +1733,11 @@ namespace Parser
         }
     }
 
-    public class BaseClassInvokationSyntaxNode : ExpressionSyntaxNode
+    public class ClassInvokationExpressionSyntaxNode : ExpressionSyntaxNode
     {
         private SyntaxNode? _methodName;
         private SyntaxNode? _baseClassNameAndArguments;
-        internal BaseClassInvokationSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
+        internal ClassInvokationExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
@@ -1715,7 +1745,7 @@ namespace Parser
         {
             get
             {
-                return new SyntaxToken(this, ((Parser.Internal.BaseClassInvokationSyntaxNode)_green)._atSign, this.GetChildPosition(1));
+                return new SyntaxToken(this, ((Parser.Internal.ClassInvokationExpressionSyntaxNode)_green)._atSign, this.GetChildPosition(1));
             }
         }
 
@@ -1749,7 +1779,7 @@ namespace Parser
 
         public override void Accept(SyntaxVisitor visitor)
         {
-            visitor.VisitBaseClassInvokation(this);
+            visitor.VisitClassInvokationExpression(this);
         }
     }
 
@@ -1795,18 +1825,16 @@ namespace Parser
 
     public class AttributeSyntaxNode : SyntaxNode
     {
-        private SyntaxNode? _name;
         private SyntaxNode? _assignment;
         internal AttributeSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
-        public IdentifierNameSyntaxNode Name
+        public SyntaxToken Name
         {
             get
             {
-                var red = this.GetRed(ref this._name!, 0);
-                return red is null ? throw new System.Exception("name cannot be null.") : (IdentifierNameSyntaxNode)red;
+                return new SyntaxToken(this, ((Parser.Internal.AttributeSyntaxNode)_green)._name, this.GetChildPosition(0));
             }
         }
 
@@ -1823,7 +1851,7 @@ namespace Parser
         {
             return i switch
             {
-            0 => GetRed(ref _name!, 0), 1 => GetRed(ref _assignment, 1), _ => null
+            1 => GetRed(ref _assignment, 1), _ => null
             }
 
             ;
@@ -1883,7 +1911,7 @@ namespace Parser
         }
     }
 
-    public class MethodDefinitionSyntaxNode : MethodDeclarationSyntaxNode
+    public class ConcreteMethodDeclarationSyntaxNode : MethodDeclarationSyntaxNode
     {
         private SyntaxNode? _outputDescription;
         private SyntaxNode? _name;
@@ -1891,7 +1919,7 @@ namespace Parser
         private SyntaxNode? _commas;
         private SyntaxNode? _body;
         private SyntaxNode? _endKeyword;
-        internal MethodDefinitionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
+        internal ConcreteMethodDeclarationSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
@@ -1899,7 +1927,7 @@ namespace Parser
         {
             get
             {
-                return new SyntaxToken(this, ((Parser.Internal.MethodDefinitionSyntaxNode)_green)._functionKeyword, this.GetChildPosition(0));
+                return new SyntaxToken(this, ((Parser.Internal.ConcreteMethodDeclarationSyntaxNode)_green)._functionKeyword, this.GetChildPosition(0));
             }
         }
 
@@ -1912,12 +1940,12 @@ namespace Parser
             }
         }
 
-        public CompoundNameSyntaxNode Name
+        public CompoundNameExpressionSyntaxNode Name
         {
             get
             {
                 var red = this.GetRed(ref this._name!, 2);
-                return red is null ? throw new System.Exception("name cannot be null.") : (CompoundNameSyntaxNode)red;
+                return red is null ? throw new System.Exception("name cannot be null.") : (CompoundNameExpressionSyntaxNode)red;
             }
         }
 
@@ -1939,12 +1967,12 @@ namespace Parser
             }
         }
 
-        public SyntaxNodeOrTokenList Body
+        public StatementSyntaxNode Body
         {
             get
             {
                 var red = this.GetRed(ref this._body!, 5);
-                return red is null ? throw new System.Exception("body cannot be null.") : (SyntaxNodeOrTokenList)red;
+                return red is null ? throw new System.Exception("body cannot be null.") : (StatementSyntaxNode)red;
             }
         }
 
@@ -1969,7 +1997,7 @@ namespace Parser
 
         public override void Accept(SyntaxVisitor visitor)
         {
-            visitor.VisitMethodDefinition(this);
+            visitor.VisitConcreteMethodDeclaration(this);
         }
     }
 
@@ -1991,12 +2019,12 @@ namespace Parser
             }
         }
 
-        public CompoundNameSyntaxNode Name
+        public CompoundNameExpressionSyntaxNode Name
         {
             get
             {
                 var red = this.GetRed(ref this._name!, 1);
-                return red is null ? throw new System.Exception("name cannot be null.") : (CompoundNameSyntaxNode)red;
+                return red is null ? throw new System.Exception("name cannot be null.") : (CompoundNameExpressionSyntaxNode)red;
             }
         }
 
@@ -2184,7 +2212,6 @@ namespace Parser
     public class ClassDeclarationSyntaxNode : StatementSyntaxNode
     {
         private SyntaxNode? _attributes;
-        private SyntaxNode? _className;
         private SyntaxNode? _baseClassList;
         private SyntaxNode? _nodes;
         internal ClassDeclarationSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
@@ -2199,6 +2226,14 @@ namespace Parser
             }
         }
 
+        public SyntaxToken ClassName
+        {
+            get
+            {
+                return new SyntaxToken(this, ((Parser.Internal.ClassDeclarationSyntaxNode)_green)._className, this.GetChildPosition(2));
+            }
+        }
+
         public SyntaxToken EndKeyword
         {
             get
@@ -2216,15 +2251,6 @@ namespace Parser
             }
         }
 
-        public IdentifierNameSyntaxNode ClassName
-        {
-            get
-            {
-                var red = this.GetRed(ref this._className!, 2);
-                return red is null ? throw new System.Exception("className cannot be null.") : (IdentifierNameSyntaxNode)red;
-            }
-        }
-
         public BaseClassListSyntaxNode? BaseClassList
         {
             get
@@ -2247,7 +2273,7 @@ namespace Parser
         {
             return i switch
             {
-            1 => GetRed(ref _attributes, 1), 2 => GetRed(ref _className!, 2), 3 => GetRed(ref _baseClassList, 3), 4 => GetRed(ref _nodes!, 4), _ => null
+            1 => GetRed(ref _attributes, 1), 3 => GetRed(ref _baseClassList, 3), 4 => GetRed(ref _nodes!, 4), _ => null
             }
 
             ;
@@ -2309,19 +2335,17 @@ namespace Parser
 
     public class EnumerationItemSyntaxNode : SyntaxNode
     {
-        private SyntaxNode? _name;
         private SyntaxNode? _values;
         private SyntaxNode? _commas;
         internal EnumerationItemSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position): base(parent, green, position)
         {
         }
 
-        public IdentifierNameSyntaxNode Name
+        public SyntaxToken Name
         {
             get
             {
-                var red = this.GetRed(ref this._name!, 0);
-                return red is null ? throw new System.Exception("name cannot be null.") : (IdentifierNameSyntaxNode)red;
+                return new SyntaxToken(this, ((Parser.Internal.EnumerationItemSyntaxNode)_green)._name, this.GetChildPosition(0));
             }
         }
 
@@ -2347,7 +2371,7 @@ namespace Parser
         {
             return i switch
             {
-            0 => GetRed(ref _name!, 0), 1 => GetRed(ref _values, 1), 2 => GetRed(ref _commas!, 2), _ => null
+            1 => GetRed(ref _values, 1), 2 => GetRed(ref _commas!, 2), _ => null
             }
 
             ;

Parser/SyntaxNode.cs

@@ -141,9 +141,9 @@ namespace Parser
         }
     }
 
-    public abstract class FunctionHandleSyntaxNode : ExpressionSyntaxNode
+    public abstract class FunctionHandleExpressionSyntaxNode : ExpressionSyntaxNode
     {
-        internal FunctionHandleSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position) : base(parent, green, position)
+        internal FunctionHandleExpressionSyntaxNode(SyntaxNode parent, Internal.GreenNode green, int position) : base(parent, green, position)
         {
         }
     }

Parser/SyntaxToken.cs

@@ -29,6 +29,8 @@ namespace Parser
 
         public int Position { get; }
 
+        public object? Value => _token.GetValue();
+
         public bool Equals(SyntaxToken other)
         {
             return Equals(_parent, other._parent) && Equals(_token, other._token);

Parser/SyntaxTree.cs

@@ -0,0 +1,27 @@
+using System;
+using Parser.Internal;
+
+namespace Parser
+{
+    public class SyntaxTree
+    {
+        public SyntaxTree(RootSyntaxNode nullRoot, DiagnosticsBag diagnostics)
+        {
+            NullRoot = nullRoot ?? throw new ArgumentNullException(nameof(nullRoot));
+            Diagnostics = diagnostics ?? throw new ArgumentNullException(nameof(diagnostics));
+        }
+
+        public RootSyntaxNode NullRoot { get; }
+        public FileSyntaxNode Root => NullRoot.File;
+        public DiagnosticsBag Diagnostics { get; }
+
+        public static SyntaxTree Parse(string text)
+        {
+            var window = new TextWindowWithNull(text);
+            var parser = new MParser(window);
+            var tree = parser.Parse();
+            return tree;
+        }
+    }
+
+}

Parser/SyntaxVisitor.Generated.cs

@@ -8,6 +8,11 @@ namespace Parser
             DefaultVisit(node);
         }
 
+        public virtual void VisitBlockStatement(BlockStatementSyntaxNode node)
+        {
+            DefaultVisit(node);
+        }
+
         public virtual void VisitFunctionDeclaration(FunctionDeclarationSyntaxNode node)
         {
             DefaultVisit(node);
@@ -93,17 +98,17 @@ namespace Parser
             DefaultVisit(node);
         }
 
-        public virtual void VisitCompoundName(CompoundNameSyntaxNode node)
+        public virtual void VisitCompoundNameExpression(CompoundNameExpressionSyntaxNode node)
         {
             DefaultVisit(node);
         }
 
-        public virtual void VisitNamedFunctionHandle(NamedFunctionHandleSyntaxNode node)
+        public virtual void VisitNamedFunctionHandleExpression(NamedFunctionHandleExpressionSyntaxNode node)
         {
             DefaultVisit(node);
         }
 
-        public virtual void VisitLambda(LambdaSyntaxNode node)
+        public virtual void VisitLambdaExpression(LambdaExpressionSyntaxNode node)
         {
             DefaultVisit(node);
         }
@@ -113,27 +118,27 @@ namespace Parser
             DefaultVisit(node);
         }
 
-        public virtual void VisitIdentifierName(IdentifierNameSyntaxNode node)
+        public virtual void VisitIdentifierNameExpression(IdentifierNameExpressionSyntaxNode node)
         {
             DefaultVisit(node);
         }
 
-        public virtual void VisitNumberLiteral(NumberLiteralSyntaxNode node)
+        public virtual void VisitNumberLiteralExpression(NumberLiteralExpressionSyntaxNode node)
         {
             DefaultVisit(node);
         }
 
-        public virtual void VisitStringLiteral(StringLiteralSyntaxNode node)
+        public virtual void VisitStringLiteralExpression(StringLiteralExpressionSyntaxNode node)
         {
             DefaultVisit(node);
         }
 
-        public virtual void VisitDoubleQuotedStringLiteral(DoubleQuotedStringLiteralSyntaxNode node)
+        public virtual void VisitDoubleQuotedStringLiteralExpression(DoubleQuotedStringLiteralExpressionSyntaxNode node)
         {
             DefaultVisit(node);
         }
 
-        public virtual void VisitUnquotedStringLiteral(UnquotedStringLiteralSyntaxNode node)
+        public virtual void VisitUnquotedStringLiteralExpression(UnquotedStringLiteralExpressionSyntaxNode node)
         {
             DefaultVisit(node);
         }
@@ -163,17 +168,17 @@ namespace Parser
             DefaultVisit(node);
         }
 
-        public virtual void VisitMemberAccess(MemberAccessSyntaxNode node)
+        public virtual void VisitMemberAccessExpression(MemberAccessExpressionSyntaxNode node)
         {
             DefaultVisit(node);
         }
 
-        public virtual void VisitUnaryPostixOperationExpression(UnaryPostixOperationExpressionSyntaxNode node)
+        public virtual void VisitUnaryPostfixOperationExpression(UnaryPostfixOperationExpressionSyntaxNode node)
         {
             DefaultVisit(node);
         }
 
-        public virtual void VisitIndirectMemberAccess(IndirectMemberAccessSyntaxNode node)
+        public virtual void VisitIndirectMemberAccessExpression(IndirectMemberAccessExpressionSyntaxNode node)
         {
             DefaultVisit(node);
         }
@@ -183,7 +188,7 @@ namespace Parser
             DefaultVisit(node);
         }
 
-        public virtual void VisitBaseClassInvokation(BaseClassInvokationSyntaxNode node)
+        public virtual void VisitClassInvokationExpression(ClassInvokationExpressionSyntaxNode node)
         {
             DefaultVisit(node);
         }
@@ -203,7 +208,7 @@ namespace Parser
             DefaultVisit(node);
         }
 
-        public virtual void VisitMethodDefinition(MethodDefinitionSyntaxNode node)
+        public virtual void VisitConcreteMethodDeclaration(ConcreteMethodDeclarationSyntaxNode node)
         {
             DefaultVisit(node);
         }

Parser/TokenKind.cs

@@ -3,7 +3,9 @@
     // We use the same set of kinds for syntax tokens & syntax nodes.
     public enum TokenKind
     {
-        // SYNTAX TOKENS
+        // *****************
+        // * SYNTAX TOKENS *
+        // *****************
 
         None = 0,
         BadToken = 1,
@@ -123,31 +125,58 @@
         UnaryNot = 59,
         UnaryQuestionMark = 60,
 
-        // SYNTAX NODES
+        // ****************
+        // * SYNTAX NODES *
+        // ****************
+
         // The whole file.
         File = 100,
+
         // a list of syntax nodes and/or tokens.
         List,
+
+
+        // STATEMENTS
+        // The name ends with "Declaration" or "Statement".
+
+        // result = abstractMethod(object)
+        AbstractMethodDeclaration,
+
+        // statement1
+        // statement2;
+        BlockStatement,
+
+        // classdef MyClass < BaseClass, AnotherBaseClass
+        //     properties
+        //         y
+        //     end
+        //     methods
+        //         <...>
+        //     end
+        // end
+        ClassDeclaration,
+
+        // function result = method(obj)
+        //     <...>
+        // end
+        ConcreteMethodDeclaration,
+
+        // 
+        EmptyStatement,
+
+        // a = 5;
+        ExpressionStatement,
+
+        // for a = 1:5
+        //     process(a);
+        // end
+        ForStatement,
+
         // [output1, output2] = function(input1, input2)
         // <...>
         // end
         FunctionDeclaration,
-        // (input1, input2)
-        FunctionInputDescription,
-        // [output1, output2] =
-        FunctionOutputDescription,
-        // switch a
-        //     case 1
-        // <...>
-        // end
-        SwitchStatement,
-        // case 1
-        //     doSomething();
-        SwitchCase,
-        // while a < 10
-        //     doSomething();
-        // end
-        WhileStatement,
+
         // if a < 5
         //     doSomething();
         // elseif a > 10
@@ -156,84 +185,125 @@
         //     GiveUp();
         // end
         IfStatement,
-        // elseif a > 10
-        //     doSomethingElse();
-        ElseifClause,
-        // else
-        //     GiveUp();
-        ElseClause,
-        // for a = 1:5
-        //     process(a);
+
+        // switch a
+        //     case 1
+        // <...>
         // end
-        ForStatement,
-        // a = 1:5
-        AssignmentExpression,
-        // catch e
-        //     dealWithIt(e);
-        // end
-        CatchClause,
+        SwitchStatement,
+
         // try
         //     somethingWeird();
         // catch e
         //     dealWithIt(e);
         // end
         TryCatchStatement,
-        // a = 5;
-        ExpressionStatement,
-        // 
-        EmptyStatement,
-        // 
-        EmptyExpression,
-        // -13
-        UnaryPrefixOperationExpression,
-        // some.complex.name
-        CompoundName,
-        // @func
-        NamedFunctionHandle,
-        // @(x) x + 1
-        Lambda,
-        // +
-        BinaryOperation,
-        // a
-        IdentifierName,
-        // 123
-        NumberLiteralExpression,
-        // 'abc'
-        StringLiteralExpression,
-        // "abc"
-        DoubleQuotedStringLiteralExpression,
-        // abc
-        UnquotedStringLiteralExpression,
+
+        // while a < 10
+        //     doSomething();
+        // end
+        WhileStatement,
+
+
+        // EXPRESSIONS
+        // The name ends with "Expression".
+
         // [1, 2; 3 4]
         ArrayLiteralExpression,
+
+        // a = 1:5
+        AssignmentExpression,
+
+        // +
+        BinaryOperationExpression,
+
+        // abc{2}
+        CellArrayElementAccessExpression,
+
         // {1, 3, 'abc'}
         CellArrayLiteralExpression,
+
+        // method@SuperClass(object)
+        ClassInvokationExpression,
+
+        // cd some/+folder/
+        CommandExpression,
+
+        // some.complex.name
+        CompoundNameExpression,
+
+        // "abc"
+        DoubleQuotedStringLiteralExpression,
+
+        // 
+        EmptyExpression,
+
+        // doSomething(5)
+        FunctionCallExpression,
+
+        // a
+        IdentifierNameExpression,
+
+        // struct.(field)
+        IndirectMemberAccessExpression,
+
+        // @(x) x + 1
+        LambdaExpression,
+
+        // object.member
+        MemberAccessExpression,
+
+        // @func
+        NamedFunctionHandleExpression,
+
+        // 123
+        NumberLiteralExpression,
+
         // (1 + 2 * 3)
         ParenthesizedExpression,
-        // abc{2}
-        CellArrayElementAccess,
-        // doSomething(5)
-        FunctionCall,
-        // object.member
-        MemberAccess,
+
+        // 'abc'
+        StringLiteralExpression,
+
+        // -13
+        UnaryPrefixOperationExpression,
+
         // [1 2 3]'
         UnaryPostfixOperationExpression,
-        // struct.(field)
-        IndirectMemberAccess,
-        // cd some/+folder/
-        Command,
-        // method@SuperClass(object)
-        ClassInvokation,
+
+        // abc
+        UnquotedStringLiteralExpression,
+
+
+        // PARTS OF STATEMENTS & EXPRESSIONS
+
+        // (input1, input2)
+        FunctionInputDescription,
+        // [output1, output2] =
+        FunctionOutputDescription,
+
+        // case 1
+        //     doSomething();
+        SwitchCase,
+
+        // elseif a > 10
+        //     doSomethingElse();
+        ElseifClause,
+        // else
+        //     GiveUp();
+        ElseClause,
+        // catch e
+        //     dealWithIt(e);
+        // end
+        CatchClause,
+
         // = true
         AttributeAssignment,
         // Sealed = true
         Attribute,
         // (Sealed = true)
         AttributeList,
-        // function result = method(obj)
-        //     <...>
-        // end
-        MethodDefinition,
+
         // methods
         //     function result = method(obj)
         //     <...>
@@ -247,15 +317,7 @@
         PropertiesList,
         // < BaseClass, AnotherBaseClass
         BaseClassList,
-        // classdef MyClass < BaseClass, AnotherBaseClass
-        //     properties
-        //         y
-        //     end
-        //     methods
-        //         <...>
-        //     end
-        // end
-        ClassDeclaration,
+
         // (1)
         EnumerationItemValue,
         // One (1)
@@ -265,8 +327,6 @@
         //     Two (2)
         // end
         EnumerationList,
-        // result = abstractMethod(object)
-        AbstractMethodDeclaration,
         // events
         //     ToggleSomething
         // end

Parser/UnresolvedFunctionSymbol.cs

@@ -0,0 +1,12 @@
+namespace Parser
+{
+    internal class UnresolvedFunctionSymbol
+    {
+        public string Name { get; }
+
+        public UnresolvedFunctionSymbol(string name)
+        {
+            Name = name;
+        }
+    }
+}

Repl/MRepl.cs

@@ -1,67 +1,80 @@
 using System;
+using System.Linq;
 using Parser;
 
 namespace Repl
 {
     public class MRepl
     {
+        private readonly CompilationContext _context;
+
+        public MRepl()
+        {
+            _context = CompilationContext.Empty;
+        }
+
         public void Run()
         {
             while (true)
             {
-                Console.Write("> ");
-                var line = Console.ReadLine();
-                var window = new TextWindowWithNull(line);
-                var parser = new MParser(window);
-                var tree = parser.Parse();
-                if (tree.Diagnostics.Diagnostics.Count > 0)
+                var line = Read();
+                if (line.StartsWith('#'))
                 {
-                    foreach (var diagnostic in tree.Diagnostics.Diagnostics)
+                    line = line.Trim();
+                    if (line == "#q")
                     {
-                        Console.WriteLine($"{diagnostic.Span}: {diagnostic.Message}");
+                        break;
                     }
+                    Console.ForegroundColor = ConsoleColor.DarkRed;
+                    Console.WriteLine($"Unknown command '{line}'.");
+                    Console.ResetColor();
+                    continue;
+                }
+                var result = Evaluate(line);
+                Print(result);
+            }
+        }
+
+        private void Print(string result)
+        {
+            Console.ForegroundColor = ConsoleColor.Green;
+            Console.WriteLine(result);
+            Console.ResetColor();
+        }
+
+        private string Read()
+        {
+            Console.Write("> ");
+            return Console.ReadLine();
+        }
+
+        private string Evaluate(string submission)
+        {
+            var tree = SyntaxTree.Parse(submission);
+            if (tree.Diagnostics.Any())
+            {
+                foreach (var diagnostic in tree.Diagnostics.Diagnostics)
+                {
+                    Console.ForegroundColor = ConsoleColor.DarkRed;
+                    Console.WriteLine($"{diagnostic.Span}: {diagnostic.Message}");
+                    Console.ResetColor();
                 }
                 TreeRenderer.RenderTree(tree);
+                return string.Empty;
             }
-        }
-    }
 
-    public class TreeRenderer
-    {
-        private static void RenderToken(SyntaxToken token, string indent, bool isLast)
-        {
-            Console.Write(indent + (isLast ? "└── " : "├── "));
-            Console.Write($"<{token.Kind}>");
-            Console.Write($" {token.Text}");
-            Console.WriteLine();
-        }
+            TreeRenderer.RenderTree(tree);
+            var compilation = Compilation.Create(tree);
+            var evaluationResult = compilation.Evaluate(_context, inRepl: true);
 
-        private static void RenderNode(SyntaxNode node, string indent, bool isLast)
-        {
-            Console.Write(indent);
-            Console.Write(isLast ? "└── " : "├── ");
-            Console.Write($"<{node.Kind}>");
-            Console.WriteLine();
-            var children = node.GetChildNodesAndTokens();
-            var last = children.Count - 1;
-            indent += isLast ? "    " : "│   ";
-            for (var index = 0; index <= last; index++)
+            foreach (var diagnostic in evaluationResult.Diagnostics)
             {
-                var child = children[index];
-                if (child.IsNode)
-                {
-                    RenderNode(child.AsNode(), indent, index == last);
-                }
-                else if (child.IsToken)
-                {
-                    RenderToken(child.AsToken(), indent, index == last);
-                }
+                Console.ForegroundColor = ConsoleColor.DarkRed;
+                Console.WriteLine($"{diagnostic.Span}: {diagnostic.Message}");
+                Console.ResetColor();
             }
-        }
 
-        public static void RenderTree(SyntaxTree tree)
-        {
-            RenderNode(tree.Root, "", true);
+            return evaluationResult.Value?.ToString() ?? string.Empty;
         }
     }
 }

Repl/TreeRenderer.cs

@@ -0,0 +1,44 @@
+using System;
+using Parser;
+
+namespace Repl
+{
+    public class TreeRenderer
+    {
+        private static void RenderToken(SyntaxToken token, string indent, bool isLast)
+        {
+            Console.Write(indent + (isLast ? "└── " : "├── "));
+            Console.Write($"<{token.Kind}>");
+            Console.Write($" {token.Text}");
+            Console.WriteLine();
+        }
+
+        private static void RenderNode(SyntaxNode node, string indent, bool isLast)
+        {
+            Console.Write(indent);
+            Console.Write(isLast ? "└── " : "├── ");
+            Console.Write($"<{node.Kind}>");
+            Console.WriteLine();
+            var children = node.GetChildNodesAndTokens();
+            var last = children.Count - 1;
+            indent += isLast ? "    " : "│   ";
+            for (var index = 0; index <= last; index++)
+            {
+                var child = children[index];
+                if (child.IsNode)
+                {
+                    RenderNode(child.AsNode(), indent, index == last);
+                }
+                else if (child.IsToken)
+                {
+                    RenderToken(child.AsToken(), indent, index == last);
+                }
+            }
+        }
+
+        public static void RenderTree(SyntaxTree tree)
+        {
+            RenderNode(tree.Root, "", true);
+        }
+    }
+}

Semantics/GetClass.cs

@@ -7,7 +7,7 @@ namespace Semantics
 {
     public class GetClass
     {
-        private static MMethod MethodFromDefinition(MethodDefinitionSyntaxNode methodDefinition)
+        private static MMethod MethodFromDefinition(ConcreteMethodDeclarationSyntaxNode methodDefinition)
         {
             var name = methodDefinition.Name.Text;
             var description = "";
@@ -42,7 +42,7 @@ namespace Semantics
                     continue;
                 }
 
-                if (method.AsNode() is MethodDefinitionSyntaxNode methodDefinition)
+                if (method.AsNode() is ConcreteMethodDeclarationSyntaxNode methodDefinition)
                 {
                     result.Add(MethodFromDefinition(methodDefinition));
                 }
@@ -58,7 +58,7 @@ namespace Semantics
         
         public static MClass FromTree(FileSyntaxNode tree, string fileName)
         {
-            var classDeclaration = tree.StatementList[0].AsNode() as ClassDeclarationSyntaxNode;
+            var classDeclaration = tree.Body.Statements[0].AsNode() as ClassDeclarationSyntaxNode;
             if (classDeclaration == null)
             {
                 return null;

Solution.sln

@@ -21,7 +21,9 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Repl", "Repl\Repl.csproj", "{8FEDFE5D-3320-418F-88A6-09C1B51C4441}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MApplication", "MApplication\MApplication.csproj", "{A7EE271C-8822-43EA-BA13-5D6D5DC5B581}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MApplication", "MApplication\MApplication.csproj", "{A7EE271C-8822-43EA-BA13-5D6D5DC5B581}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "cmi", "cmi\cmi.csproj", "{C2447F0B-733D-4755-A104-5B82E24D3F47}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -57,6 +59,10 @@ Global
 		{A7EE271C-8822-43EA-BA13-5D6D5DC5B581}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{A7EE271C-8822-43EA-BA13-5D6D5DC5B581}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{A7EE271C-8822-43EA-BA13-5D6D5DC5B581}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C2447F0B-733D-4755-A104-5B82E24D3F47}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C2447F0B-733D-4755-A104-5B82E24D3F47}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C2447F0B-733D-4755-A104-5B82E24D3F47}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C2447F0B-733D-4755-A104-5B82E24D3F47}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

SyntaxGenerator/GenerateSyntax.cs

@@ -844,7 +844,8 @@ namespace SyntaxGenerator
         public static void Input()
         {
             var serializer = new XmlSerializer(typeof(SyntaxDescription));
-            using var stream = new FileStream("input.xml", FileMode.Open);
+            var syntaxDefinitionFileName = Path.Combine(_outputPath, "SyntaxDefinition.xml");
+            using var stream = new FileStream(syntaxDefinitionFileName, FileMode.Open);
             if (!(serializer.Deserialize(stream) is SyntaxDescription syntax))
             {
                 Console.WriteLine("Couldn't deserialize syntax.");

cmi.cmd

@@ -0,0 +1 @@
+dotnet run --project cmi -- %*

cmi/Program.cs

@@ -0,0 +1,55 @@
+using Parser;
+using System;
+using System.IO;
+
+namespace cmi
+{
+
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            string fileName;
+            if (args.Length != 1)
+            {
+                Console.Error.WriteLine("Usage: cmi <file.m>");
+                fileName = @"C:\repos\MParser\examples\helloworld\hello.m";
+            }
+            else
+            {
+                fileName = args[0];
+            }
+            
+            var text = File.ReadAllText(fileName);
+            var tree = SyntaxTree.Parse(text);
+            var compilation = Compilation.Create(tree);
+            TreeRenderer.RenderTree(tree);
+            if (tree.Diagnostics.Diagnostics.Count > 0)
+            {
+                foreach (var diagnostic in tree.Diagnostics.Diagnostics)
+                {
+                    Console.ForegroundColor = ConsoleColor.DarkRed;
+                    Console.WriteLine($"{diagnostic.Span}: {diagnostic.Message}");
+                    Console.ResetColor();
+                    return;
+                }
+            }
+
+            var context = new CompilationContext();
+            var evaluationResult = compilation.Evaluate(context, inRepl: false);
+
+            foreach (var diagnostic in evaluationResult.Diagnostics)
+            {
+                Console.ForegroundColor = ConsoleColor.DarkRed;
+                Console.WriteLine($"{diagnostic.Span}: {diagnostic.Message}");
+                Console.ResetColor();
+            }
+
+            var result = evaluationResult.Value?.ToString();
+            if (result is not null)
+            {
+                Console.WriteLine(result);
+            }
+        }
+    }
+}

cmi/TreeRenderer.cs

@@ -0,0 +1,44 @@
+using Parser;
+using System;
+
+namespace cmi
+{
+    public class TreeRenderer
+    {
+        private static void RenderToken(SyntaxToken token, string indent, bool isLast)
+        {
+            Console.Write(indent + (isLast ? "└── " : "├── "));
+            Console.Write($"<{token.Kind}>");
+            Console.Write($" {token.Text}");
+            Console.WriteLine();
+        }
+
+        private static void RenderNode(SyntaxNode node, string indent, bool isLast)
+        {
+            Console.Write(indent);
+            Console.Write(isLast ? "└── " : "├── ");
+            Console.Write($"<{node.Kind}>");
+            Console.WriteLine();
+            var children = node.GetChildNodesAndTokens();
+            var last = children.Count - 1;
+            indent += isLast ? "    " : "│   ";
+            for (var index = 0; index <= last; index++)
+            {
+                var child = children[index];
+                if (child.IsNode)
+                {
+                    RenderNode(child.AsNode(), indent, index == last);
+                }
+                else if (child.IsToken)
+                {
+                    RenderToken(child.AsToken(), indent, index == last);
+                }
+            }
+        }
+
+        public static void RenderTree(SyntaxTree tree)
+        {
+            RenderNode(tree.Root, "", true);
+        }
+    }
+}

cmi/cmi.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <LangVersion>preview</LangVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Parser\Parser.csproj" />
+  </ItemGroup>
+
+</Project>

examples/helloworld/hello.m

@@ -0,0 +1,11 @@
+x = 2;
+f(x);
+f(x);
+
+function f(x)
+    disp('X was');
+    disp(x);
+    x = x + 1;
+    disp('X is')
+    disp(x);
+end