fn from()

in sdk/core/azure_core_amqp/src/messaging.rs [808:865]
52 lines of code
4 McCabe index (conditional complexity)

    fn from(properties: AmqpMessageProperties) -> AmqpList {
        let mut list = vec![AmqpValue::Null; 13];

        // Serialize the current value, if it exists. Otherwise serialize a null
        list[0] = properties
            .message_id
            .map_or(AmqpValue::Null, AmqpValue::from);
        list[1] = properties
            .user_id
            .map_or(AmqpValue::Null, AmqpValue::Binary);
        list[2] = properties.to.map_or(AmqpValue::Null, AmqpValue::String);
        list[3] = properties
            .subject
            .map_or(AmqpValue::Null, AmqpValue::String);
        list[4] = properties
            .reply_to
            .map_or(AmqpValue::Null, AmqpValue::String);
        list[5] = properties
            .correlation_id
            .map_or(AmqpValue::Null, AmqpValue::from);
        list[6] = properties
            .content_type
            .map_or(AmqpValue::Null, AmqpValue::Symbol);
        list[7] = properties
            .content_encoding
            .map_or(AmqpValue::Null, AmqpValue::Symbol);
        list[8] = properties
            .absolute_expiry_time
            .map_or(AmqpValue::Null, AmqpValue::TimeStamp);
        list[9] = properties
            .creation_time
            .map_or(AmqpValue::Null, AmqpValue::TimeStamp);
        list[10] = properties
            .group_id
            .map_or(AmqpValue::Null, AmqpValue::String);
        list[11] = properties
            .group_sequence
            .map_or(AmqpValue::Null, AmqpValue::UInt);
        list[12] = properties
            .reply_to_group_id
            .map_or(AmqpValue::Null, AmqpValue::String);

        // We will potentially have a set of trailing Null values in the list at this point,
        // we don't ever want the trailing null values to appear in the list so we remove them.

        // This behavior is described by the [AMQP spec, section 1.4](https://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-types-v1.0-os.html#section-composite-type-representation)
        // "When the trailing elements of the list representation are null, they MAY be omitted".
        let mut trailing_nulls = 0;
        for val in list.iter().rev() {
            if *val != AmqpValue::Null {
                break;
            }
            trailing_nulls += 1;
        }
        list.truncate(list.len() - trailing_nulls);

        AmqpList::from(list)
    }