template_parameter.py 文件源码

def _parse(self, df=None, independent_param_vals=None):
        expr_evaluator = Evaluator(df=df, name_dict=independent_param_vals)
        param_expr = expr_evaluator.parser()

        render_as_type = pp.Word(pp.alphas, pp.alphanums + "_$")
        render_as_type.setParseAction(lambda x: self._set_render_type(value=x[0]))

        container_type = pp.Optional(pp.Word(pp.alphas, pp.alphanums + "_$") + pp.Suppress(":"), default=None)
        container_type.setParseAction(lambda x: self._set_container_type(value=x[0]))

        parser = param_expr + pp.Suppress("->") + container_type + render_as_type

        try:
            parser.parseString(self.parameter_str)
        except pp.ParseException, e:
            raise ParameterRenderError("Error parsing parameter string: \n %s" % e)

        python_value = expr_evaluator.output_value()
        return python_value