public static void parseSource(String file) {
        try {
            LEXER.setCharStream(new ANTLRFileStream(file, "UTF8"));

            CommonTokenStream tokens = new CommonTokenStream(LEXER);

            JavaParser parser = new JavaParser(tokens);

            System.out.println("file: " + file);

            System.out.println("    Lexer Start");
            long start = System.currentTimeMillis();

            tokens.LT(1);
            long lexerStop = System.currentTimeMillis();
            System.out.println("      lexed in " + (lexerStop - start) + "ms.");

            System.out.println("    Parser Start");
            long pStart = System.currentTimeMillis();
            javaSource_return psrReturn = parser.javaSource();
            long stop = System.currentTimeMillis();
            System.out.println("      Parsed in " + (stop - pStart) + "ms.");

            Tree t = (Tree) psrReturn.getTree();

            try {
                if (parser.getNumberOfSyntaxErrors() == 0) {
                    JavaToGeneric walker = new JavaToGeneric(new CommonTreeNodeStream(t));
                    System.out.println("    AST Walk Start\n");
                    pStart = System.currentTimeMillis();
                    walker.sourceFile();
                    stop = System.currentTimeMillis();
                    System.out.println("\n      AST Walked in " + (stop - pStart) + "ms.");
                }
            } catch (Exception w) {
                System.out.println("AST walk caused exception.");
                w.printStackTrace();
            }

        } catch (IOException ex) {
            ex.printStackTrace();
        } catch (RecognitionException e) {
            e.printStackTrace();
        }
    }