Antlr4.Runtime.Tree.ParseTreeWalker.Walk C# (CSharp) Method

        public virtual void Walk(IParseTreeListener listener, IParseTree t)
        {
            if (t is IErrorNode)
            {
                listener.VisitErrorNode((IErrorNode)t);
                return;
            }
            else
            {
                if (t is ITerminalNode)
                {
                    listener.VisitTerminal((ITerminalNode)t);
                    return;
                }
            }
            IRuleNode r = (IRuleNode)t;
            EnterRule(listener, r);
            int n = r.ChildCount;
            for (int i = 0; i < n; i++)
            {
                Walk(listener, r.GetChild(i));
            }
            ExitRule(listener, r);
        }

        public static void ParseProgramOrClass(TextSourceInfo textSourceInfo, ISearchableReadOnlyList<CodeElementsLine> codeElementsLines, TypeCobolOptions compilerOptions, SymbolTable customSymbols, out Program newProgram, out Class newClass, out IList<ParserDiagnostic> diagnostics)
        {
            // Create an Antlr compatible token source on top a the token iterator
            CodeElementsLinesTokenSource tokenSource = new CodeElementsLinesTokenSource(
                textSourceInfo.Name,
                codeElementsLines);

            // Init parser
            ITokenStream tokenStream = new TokensLinesTokenStream(tokenSource, Token.CHANNEL_SourceTokens);
            ProgramClassParser cobolParser = new ProgramClassParser(tokenStream);
            // -> activate full ambiguities detection
            //parser.Interpreter.PredictionMode = PredictionMode.LlExactAmbigDetection;

            // Register all parse errors in a list in memory
            DiagnosticSyntaxErrorListener errorListener = new DiagnosticSyntaxErrorListener();
            cobolParser.RemoveErrorListeners();
            cobolParser.AddErrorListener(errorListener);

            // Try to parse a Cobol program or class
            ProgramClassParser.CobolCompilationUnitContext codeElementParseTree = cobolParser.cobolCompilationUnit();

            // Visit the parse tree to build a first class object representing a Cobol program or class
            ParseTreeWalker walker = new ParseTreeWalker();
            CobolNodeBuilder programClassBuilder = new CobolNodeBuilder();
            programClassBuilder.CustomSymbols = customSymbols;
            programClassBuilder.Dispatcher = new NodeDispatcher();
            programClassBuilder.Dispatcher.CreateListeners();
            walker.Walk(programClassBuilder, codeElementParseTree);

            // Register compiler results
            newProgram = programClassBuilder.Program;
            newClass = programClassBuilder.Class;
            diagnostics = errorListener.Diagnostics;
        }