matcher.py 文件源码

def _literal_terminal_to_python_val(literal_terminal):
    """
    Use the table of "coercer" functions to convert a terminal node from the
    parse tree to a Python value.
    """
    token_type = literal_terminal.getSymbol().type
    token_text = literal_terminal.getText()

    if token_type in _TOKEN_TYPE_COERCERS:
        coercer = _TOKEN_TYPE_COERCERS[token_type]
        try:
            python_value = coercer(token_text)
        except Exception as e:
            six.raise_from(MatcherException(u"Invalid {}: {}".format(
                STIXPatternParser.symbolicNames[token_type], token_text
            )), e)
    else:
        raise MatcherInternalError(u"Unsupported literal type: {}".format(
            STIXPatternParser.symbolicNames[token_type]))

    return python_value