containerization-framework 0.4.0

Rust bindings for Apple's Containerization framework: Linux containers in lightweight VMs, in-process and without a daemon.
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//! Network addresses: IP and MAC addresses, prefixes, and CIDR blocks.
//!
//! What Swift computes, from parsing to an address's `isLoopback`, is asked of
//! Swift, so each of those returns [`Error::Unavailable`] off macOS.

mod cidr;
mod cidr_v4;
mod cidr_v6;
mod ip_address;
mod ipv4_address;
mod ipv6_address;
mod mac_address;
mod prefix;

pub use self::cidr::Cidr;
pub use self::cidr_v4::CIDRv4;
pub use self::cidr_v6::CIDRv6;
pub use self::ip_address::IpAddress;
pub use self::ipv4_address::IPv4Address;
pub use self::ipv6_address::IPv6Address;
pub use self::mac_address::MACAddress;
pub use self::prefix::Prefix;

use crate::error::Error;
use crate::platform;
use crate::platform::ffi;
use std::cmp::Ordering;

/// A Swift `Bool`.
fn boolean(outcome: ffi::CzOutcome, action: &str) -> Result<bool, Error> {
  platform::outcome(outcome, action).map(|outcome| outcome.boolean())
}

/// A Swift `description`.
fn description(outcome: ffi::CzOutcome, action: &str) -> Result<String, Error> {
  platform::outcome(outcome, action).map(|outcome| outcome.text())
}

/// Swift's `<`, asked both ways, as Rust's partial order. `None` when Swift
/// can't be asked, as off macOS, or when neither is less but the two differ.
fn ordering<T: PartialEq>(lhs: &T, rhs: &T, less: impl Fn(&T, &T) -> Result<bool, Error>) -> Option<Ordering> {
  if less(lhs, rhs).ok()? {
    Some(Ordering::Less)
  } else if less(rhs, lhs).ok()? {
    Some(Ordering::Greater)
  } else if lhs == rhs {
    Some(Ordering::Equal)
  } else {
    None
  }
}