def _match_string_objs()

in src/cfnlint/rules/functions/Join.py [0:0]

• 57 lines of code
• 20 McCabe index (conditional complexity)

    def _match_string_objs(self, join_string_objs, cfn, path):
        """ Check join list """

        matches = []

        template_parameters = self._get_parameters(cfn)
        get_atts = cfn.get_valid_getatts()

        if isinstance(join_string_objs, dict):
            if len(join_string_objs) == 1:
                for key, value in join_string_objs.items():
                    if key not in self.list_supported_functions:
                        message = 'Fn::Join unsupported function for {0}'
                        matches.append(RuleMatch(
                            path, message.format('/'.join(map(str, path)))))
                    elif key in ['Ref']:
                        if not self._is_ref_a_list(value, template_parameters):
                            message = 'Fn::Join must use a list at {0}'
                            matches.append(RuleMatch(
                                path, message.format('/'.join(map(str, path)))))
                    elif key in ['Fn::GetAtt']:
                        if self._is_getatt_a_list(self._normalize_getatt(value), get_atts) == 'FALSE':
                            message = 'Fn::Join must use a list at {0}'
                            matches.append(RuleMatch(
                                path, message.format('/'.join(map(str, path)))))
            else:
                message = 'Join list of values should be singular for {0}'
                matches.append(RuleMatch(
                    path, message.format('/'.join(map(str, path)))))
        elif not isinstance(join_string_objs, list):
            message = 'Join list of values for {0}'
            matches.append(RuleMatch(
                path, message.format('/'.join(map(str, path)))))
        else:
            for string_obj in join_string_objs:
                if isinstance(string_obj, dict):
                    if len(string_obj) == 1:
                        for key, value in string_obj.items():
                            if key not in self.singular_supported_functions:
                                message = 'Join unsupported function for {0}'
                                matches.append(RuleMatch(
                                    path, message.format('/'.join(map(str, path)))))
                            elif key in ['Ref']:
                                if self._is_ref_a_list(value, template_parameters):
                                    message = 'Fn::Join must not be a list at {0}'
                                    matches.append(RuleMatch(
                                        path, message.format('/'.join(map(str, path)))))
                            elif key in ['Fn::GetAtt']:
                                if self._is_getatt_a_list(self._normalize_getatt(value), get_atts) == 'TRUE':
                                    message = 'Fn::Join must not be a list at {0}'
                                    matches.append(RuleMatch(
                                        path, message.format('/'.join(map(str, path)))))
                    else:
                        message = 'Join list of values should be singular for {0}'
                        matches.append(RuleMatch(
                            path, message.format('/'.join(map(str, path)))))
                elif not isinstance(string_obj, six.string_types):
                    message = 'Join list of singular function or string for {0}'
                    matches.append(RuleMatch(
                        path, message.format('/'.join(map(str, path)))))

        return matches