cotati 0.1.2

cotati is a general-purpose vector drawing interface that does not restrict binding to a back-end renderer.
Documentation 
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use std::{fmt::Display, str::FromStr};

use nom::{branch::alt, bytes::complete::tag, combinator::map, sequence::tuple, Err};

use crate::Error;

use super::Unit;

/// A length is a distance measurement, given as a number along with a unit.
#[derive(Debug, PartialEq, PartialOrd, Clone, Copy)]
pub struct Length(pub f32, pub Unit);

impl Display for Length {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}{}", self.0, self.1.as_ref())
    }
}

impl FromStr for Length {
    type Err = crate::Error;
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let (_, (value, unit)) = tuple((
            nom::number::complete::float,
            alt((
                map(tag("em"), |_| Unit::Em),
                map(tag("ex"), |_| Unit::Ex),
                map(tag("px"), |_| Unit::Px),
                map(tag("in"), |_| Unit::In),
                map(tag("cm"), |_| Unit::Cm),
                map(tag("mm"), |_| Unit::Mm),
                map(tag("pt"), |_| Unit::Pt),
                map(tag("pc"), |_| Unit::Pc),
                map(tag("%"), |_| Unit::Percentages),
            )),
        ))(s)
        .map_err(|_: Err<nom::error::Error<&str>>| Error::Angle(s.to_owned()))?;

        Ok(Self(value, unit))
    }
}

impl From<f32> for Length {
    fn from(value: f32) -> Self {
        Self::px(value)
    }
}

impl Length {
    /// Create a length with `em` unit identifier.
    pub fn em(value: f32) -> Self {
        Self(value, Unit::Em)
    }

    /// Create a length with `em` unit identifier.
    pub fn ex(value: f32) -> Self {
        Self(value, Unit::Ex)
    }

    /// Create a length with `px` unit identifier.
    pub fn px(value: f32) -> Self {
        Self(value, Unit::Px)
    }

    /// Create a length with `inch` unit identifier.
    pub fn inch(value: f32) -> Self {
        Self(value, Unit::In)
    }
    /// Create a length with `cm` unit identifier.
    pub fn cm(value: f32) -> Self {
        Self(value, Unit::Cm)
    }
    /// Create a length with `mm` unit identifier.
    pub fn mm(value: f32) -> Self {
        Self(value, Unit::Mm)
    }
    /// Create a length with `pt` unit identifier.
    pub fn pt(value: f32) -> Self {
        Self(value, Unit::Pt)
    }
    /// Create a length with `pc` unit identifier.
    pub fn pc(value: f32) -> Self {
        Self(value, Unit::Pc)
    }

    /// Create a length with `px` unit identifier.
    pub fn percentage(value: f32) -> Self {
        Self(value, Unit::Percentages)
    }
}

#[cfg(test)]
mod tests {
    use crate::primitives::Length;

    #[test]
    fn display() {
        let str = Length::cm(100.111).to_string();

        assert_eq!(str.parse::<Length>().unwrap(), Length::cm(100.111));

        assert_eq!("99.1%".parse::<Length>().unwrap(), Length::percentage(99.1));
    }
}