purr 0.9.0

Primitives for reading and writing the SMILES language in Rust.
Documentation 
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use std::fmt;
use std::convert::{ Into, TryFrom };

/// An integer charge from -15 to +15.
#[derive(Debug,PartialEq)]
pub enum Charge {
    MinusFifteen,
    MinusFourteen,
    MinusThirteen,
    MinusTwelve,
    MinusEleven,
    MinusTen,
    MinusNine,
    MinusEight,
    MinusSeven,
    MinusSix,
    MinusFive,
    MinusFour,
    MinusThree,
    MinusTwo,
    MinusOne,
    Zero,
    One,
    Two,
    Three,
    Four,
    Five,
    Six,
    Seven,
    Eight,
    Nine,
    Ten,
    Eleven,
    Twelve,
    Thirteen,
    Fourteen,
    Fifteen
}

impl TryFrom<i8> for Charge {
    type Error = ();

    fn try_from(value: i8) -> Result<Self, Self::Error> {
        Ok(match value {
            -15 => Self::MinusFifteen,
            -14 => Self::MinusFourteen,
            -13 => Self::MinusThirteen,
            -12 => Self::MinusTwelve,
            -11 => Self::MinusEleven,
            -10 => Self::MinusTen,
            -9 => Self::MinusNine,
            -8 => Self::MinusEight,
            -7 => Self::MinusSeven,
            -6 => Self::MinusSix,
            -5 => Self::MinusFive,
            -4 => Self::MinusFour,
            -3 => Self::MinusThree,
            -2 => Self::MinusTwo,
            -1 => Self::MinusOne,
            0 => Self::Zero,
            1 => Self::One,
            2 => Self::Two,
            3 => Self::Three,
            4 => Self::Four,
            5 => Self::Five,
            6 => Self::Six,
            7 => Self::Seven,
            8 => Self::Eight,
            9 => Self::Nine,
            10 => Self::Ten,
            11 => Self::Eleven,
            12 => Self::Twelve,
            13 => Self::Thirteen,
            14 => Self::Fourteen,
            15 => Self::Fifteen,
            _ => return Err(())
        })
    }
}

impl Into<i8> for &Charge {
    fn into(self) -> i8 {
        match self {
            Charge::MinusFifteen => -15,
            Charge::MinusFourteen => -14,
            Charge::MinusThirteen => -13,
            Charge::MinusTwelve => -12,
            Charge::MinusEleven => -11,
            Charge::MinusTen => -10,
            Charge::MinusNine => -9,
            Charge::MinusEight => -8,
            Charge::MinusSeven => -7,
            Charge::MinusSix => -6,
            Charge::MinusFive => -5,
            Charge::MinusFour => -4,
            Charge::MinusThree => -3,
            Charge::MinusTwo => -2,
            Charge::MinusOne => -1,
            Charge::Zero => 0,
            Charge::One => 1,
            Charge::Two => 2,
            Charge::Three => 3,
            Charge::Four => 4,
            Charge::Five => 5,
            Charge::Six => 6,
            Charge::Seven => 7,
            Charge::Eight => 8,
            Charge::Nine => 9,
            Charge::Ten => 10,
            Charge::Eleven => 11,
            Charge::Twelve => 12,
            Charge::Thirteen => 13,
            Charge::Fourteen => 14,
            Charge::Fifteen => 15
        }
    }
}

impl fmt::Display for Charge {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", match self {
            Charge::MinusFifteen => "-15",
            Charge::MinusFourteen => "-14",
            Charge::MinusThirteen => "-13",
            Charge::MinusTwelve => "-12",
            Charge::MinusEleven => "-11",
            Charge::MinusTen => "-10",
            Charge::MinusNine => "-9",
            Charge::MinusEight => "-8",
            Charge::MinusSeven => "-7",
            Charge::MinusSix => "-6",
            Charge::MinusFive => "-5",
            Charge::MinusFour => "-4",
            Charge::MinusThree => "-3",
            Charge::MinusTwo => "-2",
            Charge::MinusOne => "-",
            Charge::Zero => "",
            Charge::One => "+",
            Charge::Two => "+2",
            Charge::Three => "+3",
            Charge::Four => "+4",
            Charge::Five =>" +5",
            Charge::Six => "+6",
            Charge::Seven => "+7",
            Charge::Eight =>"+8",
            Charge::Nine => "+9",
            Charge::Ten => "+10",
            Charge::Eleven => "+11",
            Charge::Twelve => "+12",
            Charge::Thirteen => "+13",
            Charge::Fourteen => "+14",
            Charge::Fifteen => "+15"
        })
    }
}