private static CodeFile BuildStructure(AntlrInputStream inputStream) { if (inputStream == null) { throw new ArgumentNullException(nameof(inputStream)); } CdeltaLexer lexer = new CdeltaLexer(inputStream); CommonTokenStream tokenStream = new CommonTokenStream(lexer); CdeltaParser parser = new CdeltaParser(tokenStream); CdeltaParser.CodeFileContext result = parser.codeFile(); CodeFile codeFile = new CodeFile(); CdeltaGrammarVisitor visitor = new CdeltaGrammarVisitor(inputStream.ToString(), ref codeFile); visitor.Visit(result); codeFile.Finish(); codeFile.Verify(); return(codeFile); }