address 0.21.0

Network address types with strict validation, owned & borrowed variants, and standard library conversions.
Documentation 
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use crate::ParseError::InvalidHost;
use crate::{DomainRef, HostRef, IPAddress, ParseError, impl_parse_ref};

impl<'a> HostRef<'a> {
    //! Parse

    /// Parses a [HostRef] from the `text`.
    pub fn parse(text: &'a [u8]) -> Result<Self, ParseError> {
        if let Ok(ip) = IPAddress::parse(text) {
            Ok(ip.to_host_ref())
        } else if let Ok(domain) = DomainRef::parse(text) {
            Ok(domain.to_host_ref())
        } else {
            Err(InvalidHost)
        }
    }
}

impl_parse_ref!(
    HostRef,
    "IP addresses must be unbracketed: `::1`, not `[::1]`.",
    "A domain must already be lowercase; use [`Host`](crate::Host) for mixed-case input."
);

#[cfg(test)]
mod tests {
    use crate::ParseError::InvalidHost;
    use crate::{DomainRef, HostRef, IPv4Address, IPv6Address, ParseError};

    type TestCase<'a> = (&'a [u8], Result<HostRef<'a>, ParseError>);

    #[test]
    fn parse() {
        let test_cases: &[TestCase] = &[
            (b"", Err(InvalidHost)),
            (b"localhost", Ok(DomainRef::LOCALHOST.to_host_ref())),
            (b"example.com", Ok(DomainRef::EXAMPLE.to_host_ref())),
            (b"127.0.0.1", Ok(IPv4Address::LOCALHOST.to_host_ref())),
            (b"::1", Ok(IPv6Address::LOCALHOST.to_host_ref())),
            (b"[::1]", Err(InvalidHost)),
            (b"LocalHost", Err(InvalidHost)),
            (b"Local!Host", Err(InvalidHost)),
            (b"\xFF", Err(InvalidHost)),
            ("ΓΌ".as_bytes(), Err(InvalidHost)),
        ];

        for (input, expected) in test_cases {
            let result: Result<HostRef, ParseError> = HostRef::parse(input);
            assert_eq!(result, *expected, "parse input={:?}", input);

            let Ok(text) = std::str::from_utf8(input) else {
                continue;
            };

            let result: Result<HostRef, ParseError> = HostRef::try_from(text);
            assert_eq!(result, *expected, "try_from(&str) input={}", text);
        }
    }

    #[test]
    fn round_trip() {
        let canonical: &[&str] = &["localhost", "example.com", "127.0.0.1", "::1", "fe80::1"];

        for input in canonical {
            let value: HostRef = HostRef::try_from(*input).unwrap();
            assert_eq!(value.to_string(), *input, "input={}", input);
        }
    }
}