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//! Nonstandard GFF directive name.

use std::{error, fmt, str::FromStr};

/// A nonstandard GFF directive name.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct Other(pub(crate) String);

impl AsRef<str> for Other {
    fn as_ref(&self) -> &str {
        &self.0
    }
}

impl fmt::Display for Other {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        self.as_ref().fmt(f)
    }
}

impl PartialEq<&str> for Other {
    fn eq(&self, other: &&str) -> bool {
        self.0.eq(other)
    }
}

/// An error returned when a raw GFF other directive name fails to parse.
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum ParseError {
    /// The input is invalid.
    Invalid,
}

impl error::Error for ParseError {}

impl fmt::Display for ParseError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::Invalid => write!(f, "invalid input"),
        }
    }
}

impl FromStr for Other {
    type Err = ParseError;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        use super::Name;

        match Name::from(s) {
            Name::Standard(_) => Err(ParseError::Invalid),
            Name::Other(name) => Ok(name),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_from_str() {
        assert_eq!("noodles".parse(), Ok(Other(String::from("noodles"))));
        assert_eq!("gff-version".parse::<Other>(), Err(ParseError::Invalid));
    }
}