def _build_expression_component()

in boto3/dynamodb/conditions.py [0:0]

• 18 lines of code
• 11 McCabe index (conditional complexity)

    def _build_expression_component(self, value, attribute_name_placeholders,
                                    attribute_value_placeholders,
                                    has_grouped_values, is_key_condition):
        # Continue to recurse if the value is a ConditionBase in order
        # to extract out all parts of the expression.
        if isinstance(value, ConditionBase):
            return self._build_expression(
                value, attribute_name_placeholders,
                attribute_value_placeholders, is_key_condition)
        # If it is not a ConditionBase, we can recurse no further.
        # So we check if it is an attribute and add placeholders for
        # its name
        elif isinstance(value, AttributeBase):
            if is_key_condition and not isinstance(value, Key):
                raise DynamoDBNeedsKeyConditionError(
                    'Attribute object %s is of type %s. '
                    'KeyConditionExpression only supports Attribute objects '
                    'of type Key' % (value.name, type(value)))
            return self._build_name_placeholder(
                value, attribute_name_placeholders)
        # If it is anything else, we treat it as a value and thus placeholders
        # are needed for the value.
        else:
            return self._build_value_placeholder(
                value, attribute_value_placeholders, has_grouped_values)