AntlrParser.java 文件源码

private static <T extends Parser> T makeBasicParser(Class<T> parserClass,
        ANTLRInputStream stream, String parsedObjectName, List<AntlrError> errors) {
    Lexer lexer;
    Parser parser;
    if (parserClass.isAssignableFrom(SQLParser.class)) {
        lexer = new SQLLexer(stream);
        parser = new SQLParser(new CommonTokenStream(lexer));
    } else if (parserClass.isAssignableFrom(IgnoreListParser.class)) {
        lexer = new IgnoreListLexer(stream);
        parser = new IgnoreListParser(new CommonTokenStream(lexer));
    } else {
        throw new IllegalArgumentException("Unknown parser class: " + parserClass);
    }

    CustomAntlrErrorListener err = new CustomAntlrErrorListener(parsedObjectName, errors);
    lexer.removeErrorListeners();
    lexer.addErrorListener(err);
    parser.removeErrorListeners();
    parser.addErrorListener(err);

    return parserClass.cast(parser);
}