charset-norm 4.1.0

Universal character encoding detector: a Rust implementation of charset_normalizer
Documentation 
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use std::fmt;

/// Errors reported by the lookup helpers of this crate, such as
/// [`encoding::iana_name`](crate::encoding::iana_name) or
/// [`coherence::get_target_features`](crate::coherence::get_target_features).
///
/// Detection itself never fails: an unusable payload simply yields no match.
///
/// ```
/// use charset_norm::{Error, encoding};
///
/// assert_eq!(
///     encoding::iana_name("klingon-8", true),
///     Err(Error::UnknownEncoding("klingon_8".to_owned())),
/// );
/// ```
#[derive(Clone, Debug, PartialEq, Eq)]
#[non_exhaustive]
pub enum Error {
    /// The name does not resolve to a supported code page.
    UnknownEncoding(String),
    /// The language has no frequency profile.
    UnknownLanguage(String),
    /// The operation only applies to single-byte code pages.
    MultiByteEncoding(String),
    /// The name is not a known Unicode range.
    UnknownRange(String),
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Error::UnknownEncoding(name) => write!(f, "Unable to retrieve IANA for '{name}'"),
            Error::UnknownLanguage(name) => write!(f, "{name} not available"),
            Error::MultiByteEncoding(_) => {
                f.write_str("Function not supported on multi-byte code page")
            }
            Error::UnknownRange(name) => write!(f, "unknown Unicode range '{name}'"),
        }
    }
}

impl std::error::Error for Error {}