ParserSupport.java 文件源码

public Configuration configuration() throws IOException, ConfigurationException {
    final DescriptiveErrorListener error_listener = new DescriptiveErrorListener();
    final ConfigTokenizer lexer = new ConfigTokenizer(CharStreams.fromReader(reader_));
    lexer.removeErrorListeners();
    lexer.addErrorListener(error_listener);
    final ConfigParser parser = new ConfigParser(new BufferedTokenStream(lexer));
    parser.removeErrorListeners();
    parser.addErrorListener(error_listener);
    dir_.ifPresent(parser::setDir);

    final ConfigParser.ExprContext expr;
    try {
        expr = parser.expr();
    } catch (Exception ex) {
        LOG.log(Level.SEVERE, "parser yielded exceptional return", ex);
        if (!error_listener.errors.isEmpty())
            throw new ConfigurationException(error_listener.errors, ex);
        else
            throw ex;
    }

    if (!error_listener.errors.isEmpty()) {
        if (expr.exception != null)
            throw new ConfigurationException(error_listener.errors, expr.exception);
        throw new ConfigurationException(error_listener.errors);
    } else if (expr.exception != null) {
        throw new ConfigurationException(expr.exception);
    }
    return expr.s;
}