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// TODO: Impl Add, Div, Sub, Mul, PartialEq and other triats for unit types
// where posible.

// Font-relative lengths
#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}em", _0)]
pub struct Em(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}ex", _0)]
pub struct Ex(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}cap", _0)]
pub struct Cap(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}ch", _0)]
pub struct Ch(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}ic", _0)]
pub struct Ic(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}rem", _0)]
pub struct Rem(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}rlh", _0)]
pub struct Rlh(f32);

// Viewport-relative lengths
#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}vm", _0)]
pub struct Vm(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}vh", _0)]
pub struct Vh(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}vi", _0)]
pub struct Vi(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}vb", _0)]
pub struct Vb(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}vmin", _0)]
pub struct Vmin(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}vmax", _0)]
pub struct Vmax(f32);

// Absolute lengths
#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}cm", _0)]
pub struct Cm(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}mm", _0)]
pub struct Mm(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}q", _0)]
pub struct Q(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}in", _0)]
pub struct In(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}pc", _0)]
pub struct Pc(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}pt", _0)]
pub struct Pt(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}px", _0)]
pub struct Px(f32);

impl From<i32> for Px {
    fn from(source: i32) -> Self {
        Px(source as f32)
    }
}

impl From<i16> for Px {
    fn from(source: i16) -> Self {
        Px(source as f32)
    }
}

impl From<i8> for Px {
    fn from(source: i8) -> Self {
        Px(source as f32)
    }
}

// Parent-relative
#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}%", "_0 * 100.0")]
pub struct Percent(f32);

// Time units
#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}ms", _0)]
pub struct Ms(f32);

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
#[display(fmt = "{}s", _0)]
pub struct Sec(f32);

macro construct_fn( $( $fn:ident() -> $ty:ident $(,)? )* ) {
    $(
        pub fn $fn(value: impl Into<$ty>) -> $ty {
            value.into()
        }
    )*
}

construct_fn! {
    px() -> Px,
    rem() -> Rem,
    em() -> Em,
    cm() -> Cm,
    inch() -> In,
    percent() -> Percent,
    // time fns
    ms() -> Ms,
    sec() -> Sec,
}