expression_parser.py 文件源码

def expression_parser(self):
        """A function returning a (pyparsing) parser for parsing C expressions.

        Returns:
            a (pyparsing) parser for parsing C expressions.
        """
        precedence = (self._build_precedence(_UNARY_MACROS) +
                      self._build_precedence(_PRECEDENCE))

        self.expression = pyparsing.Forward()

        # pylint: disable=expression-not-assigned
        self.expression << (
            pyparsing.infixNotation(
                baseExpr=self._base_or_array_expression(),
                opList=precedence,
            )
        )

        return self.expression