Remove decorum

16 files changed, 235 insertions, 80 deletions

diff --git a/src/geom/align.rs b/src/geom/align.rs
index b0cf69db..e99bebea 100644
--- a/src/geom/align.rs
+++ b/src/geom/align.rs
@@ -17,7 +17,7 @@ pub enum Align {
 
 impl Align {
     /// The axis this alignment belongs to if it is specific.
-    pub fn axis(self) -> Option<SpecAxis> {
+    pub const fn axis(self) -> Option<SpecAxis> {
         match self {
             Self::Left => Some(SpecAxis::Horizontal),
             Self::Top => Some(SpecAxis::Vertical),
@@ -28,7 +28,7 @@ impl Align {
     }
 
     /// The inverse alignment.
-    pub fn inv(self) -> Self {
+    pub const fn inv(self) -> Self {
         match self {
             Self::Left => Self::Right,
             Self::Top => Self::Bottom,
diff --git a/src/geom/angle.rs b/src/geom/angle.rs
index 929a96fe..af47e51d 100644
--- a/src/geom/angle.rs
+++ b/src/geom/angle.rs
@@ -3,12 +3,12 @@ use super::*;
 /// An angle.
 #[derive(Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 #[derive(Serialize, Deserialize)]
-pub struct Angle(N64);
+pub struct Angle(Scalar);
 
 impl Angle {
     /// The zero angle.
-    pub fn zero() -> Self {
-        Self(N64::from(0.0))
+    pub const fn zero() -> Self {
+        Self(Scalar(0.0))
     }
 
     /// Create an angle from a number of radians.
@@ -22,8 +22,8 @@ impl Angle {
     }
 
     /// Create an angle from a number of raw units.
-    pub fn raw(raw: f64) -> Self {
-        Self(N64::from(raw))
+    pub const fn raw(raw: f64) -> Self {
+        Self(Scalar(raw))
     }
 
     /// Convert this to a number of radians.
@@ -37,13 +37,13 @@ impl Angle {
     }
 
     /// Get the value of this angle in raw units.
-    pub fn to_raw(self) -> f64 {
-        self.0.into()
+    pub const fn to_raw(self) -> f64 {
+        (self.0).0
     }
 
     /// Create an angle from a value in a unit.
     pub fn with_unit(val: f64, unit: AngularUnit) -> Self {
-        Self(N64::from(val * unit.raw_scale()))
+        Self(Scalar(val * unit.raw_scale()))
     }
 
     /// Get the value of this length in unit.
diff --git a/src/geom/dir.rs b/src/geom/dir.rs
index d95c7eb9..8c1d6b9e 100644
--- a/src/geom/dir.rs
+++ b/src/geom/dir.rs
@@ -15,7 +15,7 @@ pub enum Dir {
 
 impl Dir {
     /// The side this direction starts at.
-    pub fn start(self) -> Side {
+    pub const fn start(self) -> Side {
         match self {
             Self::LTR => Side::Left,
             Self::RTL => Side::Right,
@@ -25,7 +25,7 @@ impl Dir {
     }
 
     /// The side this direction ends at.
-    pub fn end(self) -> Side {
+    pub const fn end(self) -> Side {
         match self {
             Self::LTR => Side::Right,
             Self::RTL => Side::Left,
@@ -35,7 +35,7 @@ impl Dir {
     }
 
     /// The specific axis this direction belongs to.
-    pub fn axis(self) -> SpecAxis {
+    pub const fn axis(self) -> SpecAxis {
         match self {
             Self::LTR | Self::RTL => SpecAxis::Horizontal,
             Self::TTB | Self::BTT => SpecAxis::Vertical,
@@ -45,7 +45,7 @@ impl Dir {
     /// Whether this direction points into the positive coordinate direction.
     ///
     /// The positive directions are left-to-right and top-to-bottom.
-    pub fn is_positive(self) -> bool {
+    pub const fn is_positive(self) -> bool {
         match self {
             Self::LTR | Self::TTB => true,
             Self::RTL | Self::BTT => false,
@@ -56,12 +56,12 @@ impl Dir {
     ///
     /// - `1.0` if the direction is positive.
     /// - `-1.0` if the direction is negative.
-    pub fn factor(self) -> f64 {
+    pub const fn factor(self) -> f64 {
         if self.is_positive() { 1.0 } else { -1.0 }
     }
 
     /// The inverse direction.
-    pub fn inv(self) -> Self {
+    pub const fn inv(self) -> Self {
         match self {
             Self::LTR => Self::RTL,
             Self::RTL => Self::LTR,
diff --git a/src/geom/em.rs b/src/geom/em.rs
index caddbcdd..05d1d7d5 100644
--- a/src/geom/em.rs
+++ b/src/geom/em.rs
@@ -5,27 +5,27 @@ use super::*;
 /// `1em` is the same as the font size.
 #[derive(Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 #[derive(Serialize, Deserialize)]
-pub struct Em(N64);
+pub struct Em(Scalar);
 
 impl Em {
     /// The zero length.
-    pub fn zero() -> Self {
-        Self(N64::from(0.0))
+    pub const fn zero() -> Self {
+        Self(Scalar(0.0))
     }
 
     /// The font size.
-    pub fn one() -> Self {
-        Self(N64::from(1.0))
+    pub const fn one() -> Self {
+        Self(Scalar(1.0))
     }
 
     /// Create an font-relative length.
-    pub fn new(em: f64) -> Self {
-        Self(N64::from(em))
+    pub const fn new(em: f64) -> Self {
+        Self(Scalar(em))
     }
 
     /// Create font units at the given units per em.
     pub fn from_units(units: impl Into<f64>, units_per_em: f64) -> Self {
-        Self(N64::from(units.into() / units_per_em))
+        Self(Scalar(units.into() / units_per_em))
     }
 
     /// Convert to a length at the given font size.
@@ -34,8 +34,8 @@ impl Em {
     }
 
     /// The number of em units.
-    pub fn get(self) -> f64 {
-        self.0.into()
+    pub const fn get(self) -> f64 {
+        (self.0).0
     }
 
     /// Whether the length is zero.
diff --git a/src/geom/fr.rs b/src/geom/fr.rs
index 28d53d8f..e7cd276d 100644
--- a/src/geom/fr.rs
+++ b/src/geom/fr.rs
@@ -2,27 +2,27 @@ use super::*;
 
 /// A fractional length.
 #[derive(Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
-pub struct Fractional(N64);
+pub struct Fractional(Scalar);
 
 impl Fractional {
     /// Takes up zero space: `0fr`.
-    pub fn zero() -> Self {
-        Self(N64::from(0.0))
+    pub const fn zero() -> Self {
+        Self(Scalar(0.0))
     }
 
     /// Takes up as much space as all other items with this fractional size: `1fr`.
-    pub fn one() -> Self {
-        Self(N64::from(1.0))
+    pub const fn one() -> Self {
+        Self(Scalar(1.0))
     }
 
     /// Create a new fractional value.
-    pub fn new(ratio: f64) -> Self {
-        Self(N64::from(ratio))
+    pub const fn new(ratio: f64) -> Self {
+        Self(Scalar(ratio))
     }
 
     /// Get the underlying ratio.
-    pub fn get(self) -> f64 {
-        self.0.into()
+    pub const fn get(self) -> f64 {
+        (self.0).0
     }
 
     /// Whether the ratio is zero.
diff --git a/src/geom/gen.rs b/src/geom/gen.rs
index ff8c881a..e770f80d 100644
--- a/src/geom/gen.rs
+++ b/src/geom/gen.rs
@@ -11,7 +11,7 @@ pub struct Gen<T> {
 
 impl<T> Gen<T> {
     /// Create a new instance from the two components.
-    pub fn new(inline: T, block: T) -> Self {
+    pub const fn new(inline: T, block: T) -> Self {
         Self { inline, block }
     }
 
diff --git a/src/geom/length.rs b/src/geom/length.rs
index 68261d5f..210dcce7 100644
--- a/src/geom/length.rs
+++ b/src/geom/length.rs
@@ -4,17 +4,17 @@ use super::*;
 #[derive(Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 #[derive(Serialize, Deserialize)]
 #[serde(transparent)]
-pub struct Length(N64);
+pub struct Length(Scalar);
 
 impl Length {
     /// The zero length.
-    pub fn zero() -> Self {
-        Self(N64::from(0.0))
+    pub const fn zero() -> Self {
+        Self(Scalar(0.0))
     }
 
     /// The inifinite length.
-    pub fn inf() -> Self {
-        Self(N64::from(f64::INFINITY))
+    pub const fn inf() -> Self {
+        Self(Scalar(f64::INFINITY))
     }
 
     /// Create a length from a number of points.
@@ -38,8 +38,8 @@ impl Length {
     }
 
     /// Create a length from a number of raw units.
-    pub fn raw(raw: f64) -> Self {
-        Self(N64::from(raw))
+    pub const fn raw(raw: f64) -> Self {
+        Self(Scalar(raw))
     }
 
     /// Convert this to a number of points.
@@ -63,13 +63,13 @@ impl Length {
     }
 
     /// Get the value of this length in raw units.
-    pub fn to_raw(self) -> f64 {
-        self.0.into()
+    pub const fn to_raw(self) -> f64 {
+        (self.0).0
     }
 
     /// Create a length from a value in a unit.
     pub fn with_unit(val: f64, unit: LengthUnit) -> Self {
-        Self(N64::from(val * unit.raw_scale()))
+        Self(Scalar(val * unit.raw_scale()))
     }
 
     /// Get the value of this length in unit.
@@ -79,17 +79,17 @@ impl Length {
 
     /// Whether the length is zero.
     pub fn is_zero(self) -> bool {
-        self.0 == 0.0
+        self.to_raw() == 0.0
     }
 
     /// Whether the length is finite.
     pub fn is_finite(self) -> bool {
-        self.0.into_inner().is_finite()
+        self.to_raw().is_finite()
     }
 
     /// Whether the length is infinite.
     pub fn is_infinite(self) -> bool {
-        self.0.into_inner().is_infinite()
+        self.to_raw().is_infinite()
     }
 
     /// The absolute value of the this length.
@@ -211,14 +211,14 @@ assign_impl!(Length *= f64);
 assign_impl!(Length /= f64);
 
 impl Sum for Length {
-    fn sum<I: Iterator<Item = Length>>(iter: I) -> Self {
-        iter.fold(Length::zero(), Add::add)
+    fn sum<I: Iterator<Item = Self>>(iter: I) -> Self {
+        Self(iter.map(|s| s.0).sum())
     }
 }
 
-impl<'a> Sum<&'a Length> for Length {
-    fn sum<I: Iterator<Item = &'a Length>>(iter: I) -> Self {
-        iter.copied().fold(Length::zero(), Add::add)
+impl<'a> Sum<&'a Self> for Length {
+    fn sum<I: Iterator<Item = &'a Self>>(iter: I) -> Self {
+        Self(iter.map(|s| s.0).sum())
     }
 }
 
diff --git a/src/geom/linear.rs b/src/geom/linear.rs
index 059528e9..4a0def2f 100644
--- a/src/geom/linear.rs
+++ b/src/geom/linear.rs
@@ -11,7 +11,7 @@ pub struct Linear {
 
 impl Linear {
     /// The zero linear.
-    pub fn zero() -> Self {
+    pub const fn zero() -> Self {
         Self {
             rel: Relative::zero(),
             abs: Length::zero(),
@@ -19,7 +19,7 @@ impl Linear {
     }
 
     /// The linear with a relative part of `100%` and no absolute part.
-    pub fn one() -> Self {
+    pub const fn one() -> Self {
         Self {
             rel: Relative::one(),
             abs: Length::zero(),
@@ -27,7 +27,7 @@ impl Linear {
     }
 
     /// Create a new linear.
-    pub fn new(rel: Relative, abs: Length) -> Self {
+    pub const fn new(rel: Relative, abs: Length) -> Self {
         Self { rel, abs }
     }
 
diff --git a/src/geom/mod.rs b/src/geom/mod.rs
index ad92813e..c763e8fa 100644
--- a/src/geom/mod.rs
+++ b/src/geom/mod.rs
@@ -14,6 +14,7 @@ mod paint;
 mod path;
 mod point;
 mod relative;
+mod scalar;
 mod sides;
 mod size;
 mod spec;
@@ -30,16 +31,18 @@ pub use paint::*;
 pub use path::*;
 pub use point::*;
 pub use relative::*;
+pub use scalar::*;
 pub use sides::*;
 pub use size::*;
 pub use spec::*;
 
+use std::cmp::Ordering;
 use std::f64::consts::PI;
 use std::fmt::{self, Debug, Formatter};
+use std::hash::{Hash, Hasher};
 use std::iter::Sum;
 use std::ops::*;
 
-use decorum::N64;
 use serde::{Deserialize, Serialize};
 
 /// Generic access to a structure's components.
diff --git a/src/geom/path.rs b/src/geom/path.rs
index 39e75312..20519cb3 100644
--- a/src/geom/path.rs
+++ b/src/geom/path.rs
@@ -16,7 +16,7 @@ pub enum PathElement {
 
 impl Path {
     /// Create an empty path.
-    pub fn new() -> Self {
+    pub const fn new() -> Self {
         Self(vec![])
     }
 
diff --git a/src/geom/point.rs b/src/geom/point.rs
index 8ab043c3..7c11e81b 100644
--- a/src/geom/point.rs
+++ b/src/geom/point.rs
@@ -11,22 +11,22 @@ pub struct Point {
 
 impl Point {
     /// The origin point.
-    pub fn zero() -> Self {
+    pub const fn zero() -> Self {
         Self { x: Length::zero(), y: Length::zero() }
     }
 
     /// Create a new point from x and y coordinate.
-    pub fn new(x: Length, y: Length) -> Self {
+    pub const fn new(x: Length, y: Length) -> Self {
         Self { x, y }
     }
 
     /// Create an instance with two equal components.
-    pub fn splat(value: Length) -> Self {
+    pub const fn splat(value: Length) -> Self {
         Self { x: value, y: value }
     }
 
     /// Convert to the generic representation.
-    pub fn to_gen(self, block: SpecAxis) -> Gen<Length> {
+    pub const fn to_gen(self, block: SpecAxis) -> Gen<Length> {
         match block {
             SpecAxis::Horizontal => Gen::new(self.y, self.x),
             SpecAxis::Vertical => Gen::new(self.x, self.y),
diff --git a/src/geom/relative.rs b/src/geom/relative.rs
index e46c51de..463c5d46 100644
--- a/src/geom/relative.rs
+++ b/src/geom/relative.rs
@@ -5,27 +5,27 @@ use super::*;
 /// _Note_: `50%` is represented as `0.5` here, but stored as `50.0` in the
 /// corresponding [literal](crate::syntax::ast::LitKind::Percent).
 #[derive(Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
-pub struct Relative(N64);
+pub struct Relative(Scalar);
 
 impl Relative {
     /// A ratio of `0%` represented as `0.0`.
-    pub fn zero() -> Self {
-        Self(N64::from(0.0))
+    pub const fn zero() -> Self {
+        Self(Scalar(0.0))
     }
 
     /// A ratio of `100%` represented as `1.0`.
-    pub fn one() -> Self {
-        Self(N64::from(1.0))
+    pub const fn one() -> Self {
+        Self(Scalar(1.0))
     }
 
     /// Create a new relative value.
-    pub fn new(ratio: f64) -> Self {
-        Self(N64::from(ratio))
+    pub const fn new(ratio: f64) -> Self {
+        Self(Scalar(ratio))
     }
 
     /// Get the underlying ratio.
-    pub fn get(self) -> f64 {
-        self.0.into()
+    pub const fn get(self) -> f64 {
+        (self.0).0
     }
 
     /// Resolve this relative to the given `length`.
diff --git a/src/geom/scalar.rs b/src/geom/scalar.rs
new file mode 100644
index 00000000..6536e23a
--- /dev/null
+++ b/src/geom/scalar.rs
@@ -0,0 +1,152 @@
+use super::*;
+
+/// A 64-bit float that implements `Eq`, `Ord` and `Hash`.
+///
+/// Panics if its `NaN` during any of those operations.
+#[derive(Default, Copy, Clone, Serialize, Deserialize)]
+#[serde(transparent)]
+pub struct Scalar(pub f64);
+
+impl From<f64> for Scalar {
+    fn from(float: f64) -> Self {
+        Self(float)
+    }
+}
+
+impl From<Scalar> for f64 {
+    fn from(scalar: Scalar) -> Self {
+        scalar.0
+    }
+}
+
+impl Debug for Scalar {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl Ord for Scalar {
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.partial_cmp(&other).expect("float is NaN")
+    }
+}
+
+impl PartialOrd for Scalar {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        self.0.partial_cmp(&other.0)
+    }
+
+    fn lt(&self, other: &Self) -> bool {
+        self.0 < other.0
+    }
+
+    fn le(&self, other: &Self) -> bool {
+        self.0 <= other.0
+    }
+
+    fn gt(&self, other: &Self) -> bool {
+        self.0 > other.0
+    }
+
+    fn ge(&self, other: &Self) -> bool {
+        self.0 >= other.0
+    }
+}
+
+impl Eq for Scalar {}
+
+impl PartialEq for Scalar {
+    fn eq(&self, other: &Self) -> bool {
+        assert!(!self.0.is_nan() && !other.0.is_nan(), "float is NaN");
+        self.0 == other.0
+    }
+}
+
+impl PartialEq<f64> for Scalar {
+    fn eq(&self, other: &f64) -> bool {
+        self == &Self(*other)
+    }
+}
+
+impl Hash for Scalar {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        debug_assert!(!self.0.is_nan(), "float is NaN");
+        self.0.to_bits().hash(state);
+    }
+}
+
+impl Neg for Scalar {
+    type Output = Self;
+
+    fn neg(self) -> Self::Output {
+        Self(-self.0)
+    }
+}
+
+impl<T: Into<Self>> Add<T> for Scalar {
+    type Output = Self;
+
+    fn add(self, rhs: T) -> Self::Output {
+        Self(self.0 + rhs.into().0)
+    }
+}
+
+impl<T: Into<Self>> AddAssign<T> for Scalar {
+    fn add_assign(&mut self, rhs: T) {
+        self.0 += rhs.into().0;
+    }
+}
+
+impl<T: Into<Self>> Sub<T> for Scalar {
+    type Output = Self;
+
+    fn sub(self, rhs: T) -> Self::Output {
+        Self(self.0 - rhs.into().0)
+    }
+}
+
+impl<T: Into<Self>> SubAssign<T> for Scalar {
+    fn sub_assign(&mut self, rhs: T) {
+        self.0 -= rhs.into().0;
+    }
+}
+
+impl<T: Into<Self>> Mul<T> for Scalar {
+    type Output = Self;
+
+    fn mul(self, rhs: T) -> Self::Output {
+        Self(self.0 * rhs.into().0)
+    }
+}
+
+impl<T: Into<Self>> MulAssign<T> for Scalar {
+    fn mul_assign(&mut self, rhs: T) {
+        self.0 *= rhs.into().0;
+    }
+}
+
+impl<T: Into<Self>> Div<T> for Scalar {
+    type Output = Self;
+
+    fn div(self, rhs: T) -> Self::Output {
+        Self(self.0 / rhs.into().0)
+    }
+}
+
+impl<T: Into<Self>> DivAssign<T> for Scalar {
+    fn div_assign(&mut self, rhs: T) {
+        self.0 /= rhs.into().0;
+    }
+}
+
+impl Sum for Scalar {
+    fn sum<I: Iterator<Item = Self>>(iter: I) -> Self {
+        Self(iter.map(|s| s.0).sum())
+    }
+}
+
+impl<'a> Sum<&'a Self> for Scalar {
+    fn sum<I: Iterator<Item = &'a Self>>(iter: I) -> Self {
+        Self(iter.map(|s| s.0).sum())
+    }
+}
diff --git a/src/geom/sides.rs b/src/geom/sides.rs
index d1fcf9b7..83407ad6 100644
--- a/src/geom/sides.rs
+++ b/src/geom/sides.rs
@@ -15,7 +15,7 @@ pub struct Sides<T> {
 
 impl<T> Sides<T> {
     /// Create a new instance from the four components.
-    pub fn new(left: T, top: T, right: T, bottom: T) -> Self {
+    pub const fn new(left: T, top: T, right: T, bottom: T) -> Self {
         Self { left, top, right, bottom }
     }
 
diff --git a/src/geom/size.rs b/src/geom/size.rs
index 2143c46b..12cb0ad2 100644
--- a/src/geom/size.rs
+++ b/src/geom/size.rs
@@ -11,17 +11,17 @@ pub struct Size {
 
 impl Size {
     /// The zero size.
-    pub fn zero() -> Self {
+    pub const fn zero() -> Self {
         Self { w: Length::zero(), h: Length::zero() }
     }
 
     /// Create a new size from width and height.
-    pub fn new(w: Length, h: Length) -> Self {
+    pub const fn new(w: Length, h: Length) -> Self {
         Self { w, h }
     }
 
     /// Create an instance with two equal components.
-    pub fn splat(v: Length) -> Self {
+    pub const fn splat(v: Length) -> Self {
         Self { w: v, h: v }
     }
 
@@ -41,17 +41,17 @@ impl Size {
     }
 
     /// Convert to a point.
-    pub fn to_point(self) -> Point {
+    pub const fn to_point(self) -> Point {
         Point::new(self.w, self.h)
     }
 
     /// Convert to a Spec.
-    pub fn to_spec(self) -> Spec<Length> {
+    pub const fn to_spec(self) -> Spec<Length> {
         Spec::new(self.w, self.h)
     }
 
     /// Convert to the generic representation.
-    pub fn to_gen(self, block: SpecAxis) -> Gen<Length> {
+    pub const fn to_gen(self, block: SpecAxis) -> Gen<Length> {
         match block {
             SpecAxis::Horizontal => Gen::new(self.h, self.w),
             SpecAxis::Vertical => Gen::new(self.w, self.h),
diff --git a/src/geom/spec.rs b/src/geom/spec.rs
index 82bedf9e..576c1c89 100644
--- a/src/geom/spec.rs
+++ b/src/geom/spec.rs
@@ -11,7 +11,7 @@ pub struct Spec<T> {
 
 impl<T> Spec<T> {
     /// Create a new instance from the two components.
-    pub fn new(x: T, y: T) -> Self {
+    pub const fn new(x: T, y: T) -> Self {
         Self { x, y }
     }