yowl 0.1.0

Primitives for reading and writing the SMILES language
Documentation 
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use std::convert::TryFrom;
use std::fmt;

use super::Element;

/// Atomic symbols that can be aliphatic.
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum Aliphatic {
    B,
    C,
    N,
    O,
    S,
    P,
    F,
    Cl,
    Br,
    I,
    At,
    Ts,
}

impl Aliphatic {
    pub const fn targets(&self) -> &[u8] {
        match self {
            Self::B => &[3],
            Self::C => &[4],
            Self::N | Self::P => &[3, 5],
            Self::O => &[2],
            Self::S => &[2, 4, 6],
            Self::F | Self::Cl | Self::Br | Self::I | Self::At | Self::Ts => &[1],
        }
    }
}

impl TryFrom<&Element> for Aliphatic {
    type Error = ();

    fn try_from(value: &Element) -> Result<Self, Self::Error> {
        match value {
            Element::B => Ok(Self::B),
            Element::C => Ok(Self::C),
            Element::N => Ok(Self::N),
            Element::O => Ok(Self::O),
            Element::S => Ok(Self::S),
            Element::P => Ok(Self::P),
            Element::F => Ok(Self::F),
            Element::Cl => Ok(Self::Cl),
            Element::Br => Ok(Self::Br),
            Element::I => Ok(Self::I),
            Element::At => Ok(Self::At),
            Element::Ts => Ok(Self::Ts),
            _ => Err(()),
        }
    }
}

impl fmt::Display for Aliphatic {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(
            f,
            "{}",
            match self {
                Self::B => "B",
                Self::C => "C",
                Self::N => "N",
                Self::O => "O",
                Self::S => "S",
                Self::P => "P",
                Self::F => "F",
                Self::Cl => "Cl",
                Self::Br => "Br",
                Self::I => "I",
                Self::At => "At",
                Self::Ts => "Ts",
            }
        )
    }
}

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

    #[test]
    fn aliphatic_B_targets() {
        assert_eq!(Aliphatic::B.targets(), &[3]);
    }
    #[test]
    fn aliphatic_C_targets() {
        assert_eq!(Aliphatic::C.targets(), &[4]);
    }
    #[test]
    fn aliphatic_N_targets() {
        assert_eq!(Aliphatic::N.targets(), &[3, 5]);
    }
    #[test]
    fn aliphatic_O_targets() {
        assert_eq!(Aliphatic::O.targets(), &[2]);
    }
    #[test]
    fn aliphatic_S_targets() {
        assert_eq!(Aliphatic::S.targets(), &[2, 4, 6]);
    }
    #[test]
    fn aliphatic_P_targets() {
        assert_eq!(Aliphatic::P.targets(), &[3, 5]);
    }
    #[test]
    fn aliphatic_F_targets() {
        assert_eq!(Aliphatic::F.targets(), &[1]);
    }
    #[test]
    fn aliphatic_Cl_targets() {
        assert_eq!(Aliphatic::Cl.targets(), &[1]);
    }
    #[test]
    fn aliphatic_Br_targets() {
        assert_eq!(Aliphatic::Br.targets(), &[1]);
    }
    #[test]
    fn aliphatic_I_targets() {
        assert_eq!(Aliphatic::I.targets(), &[1]);
    }
    #[test]
    fn aliphatic_At_targets() {
        assert_eq!(Aliphatic::At.targets(), &[1]);
    }
    #[test]
    fn aliphatic_Ts_targets() {
        assert_eq!(Aliphatic::Ts.targets(), &[1]);
    }
}