MiniJParserTest.java 文件源码

@Test
public void testParseFailingExamples() throws IOException {
    FileVisitor<Path> workingFilesVisitior = new SimpleFileVisitor<Path>() {
        @Override
        public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
            System.out.println("Testing parser input from file \""+file.toString()+"\"");
            ANTLRFileStream antlrStream = new ANTLRFileStream(file.toString());
            MiniJLexer lexer = new MiniJLexer(antlrStream);
            TokenStream tokens = new CommonTokenStream(lexer);
            MiniJParser parser = new MiniJParser(tokens);
            parser.setErrorHandler(new BailErrorStrategy());
            /*
             * Catch all exceptions first, to ensure that every single
             * compilation unit exits with an Exception. Otherwise, this
             * method will return after the first piece of code.
             */
            try {
                parser.prog();
                fail("The example "+file.toString()+" should have failed, but was accepted by the parser.");
            } catch (ParseCancellationException e) {
            }
            return super.visitFile(file, attrs);
        }
    };
    Files.walkFileTree(EXAMPLE_PROGRAM_PATH_FAILING, workingFilesVisitior);
}