Merge some modules

1 files changed, 293 insertions, 0 deletions

diff --git a/src/model/raw.rs b/src/model/raw.rs
new file mode 100644
index 00000000..b40a88ec
--- /dev/null
+++ b/src/model/raw.rs
@@ -0,0 +1,293 @@
+use std::cmp::Ordering;
+use std::fmt::{self, Debug, Formatter};
+use std::ops::{Add, Div, Mul, Neg};
+
+use super::{Fold, Resolve, Smart, StyleChain, Value};
+use crate::geom::{
+    Align, Em, Get, Length, Numeric, Paint, Relative, Spec, SpecAxis, Stroke,
+};
+use crate::library::text::TextNode;
+
+/// The unresolved alignment representation.
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
+pub enum RawAlign {
+    /// Align at the start side of the text direction.
+    Start,
+    /// Align at the end side of the text direction.
+    End,
+    /// Align at a specific alignment.
+    Specific(Align),
+}
+
+impl Resolve for RawAlign {
+    type Output = Align;
+
+    fn resolve(self, styles: StyleChain) -> Self::Output {
+        let dir = styles.get(TextNode::DIR);
+        match self {
+            Self::Start => dir.start().into(),
+            Self::End => dir.end().into(),
+            Self::Specific(align) => align,
+        }
+    }
+}
+
+impl RawAlign {
+    /// The axis this alignment belongs to.
+    pub const fn axis(self) -> SpecAxis {
+        match self {
+            Self::Start | Self::End => SpecAxis::Horizontal,
+            Self::Specific(align) => align.axis(),
+        }
+    }
+}
+
+impl From<Align> for RawAlign {
+    fn from(align: Align) -> Self {
+        Self::Specific(align)
+    }
+}
+
+impl Debug for RawAlign {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        match self {
+            Self::Start => f.pad("left"),
+            Self::End => f.pad("center"),
+            Self::Specific(align) => align.fmt(f),
+        }
+    }
+}
+
+dynamic! {
+    RawAlign: "alignment",
+}
+
+dynamic! {
+    Spec<RawAlign>: "2d alignment",
+}
+
+castable! {
+    Spec<Option<RawAlign>>,
+    Expected: "1d or 2d alignment",
+    @align: RawAlign => {
+        let mut aligns = Spec::default();
+        aligns.set(align.axis(), Some(*align));
+        aligns
+    },
+    @aligns: Spec<RawAlign> => aligns.map(Some),
+}
+
+/// The unresolved stroke representation.
+///
+/// In this representation, both fields are optional so that you can pass either
+/// just a paint (`red`), just a thickness (`0.1em`) or both (`2pt + red`) where
+/// this is expected.
+#[derive(Default, Copy, Clone, Eq, PartialEq, Hash)]
+pub struct RawStroke<T = RawLength> {
+    /// The stroke's paint.
+    pub paint: Smart<Paint>,
+    /// The stroke's thickness.
+    pub thickness: Smart<T>,
+}
+
+impl RawStroke<Length> {
+    /// Unpack the stroke, filling missing fields from the `default`.
+    pub fn unwrap_or(self, default: Stroke) -> Stroke {
+        Stroke {
+            paint: self.paint.unwrap_or(default.paint),
+            thickness: self.thickness.unwrap_or(default.thickness),
+        }
+    }
+
+    /// Unpack the stroke, filling missing fields with the default values.
+    pub fn unwrap_or_default(self) -> Stroke {
+        self.unwrap_or(Stroke::default())
+    }
+}
+
+impl Resolve for RawStroke {
+    type Output = RawStroke<Length>;
+
+    fn resolve(self, styles: StyleChain) -> Self::Output {
+        RawStroke {
+            paint: self.paint,
+            thickness: self.thickness.resolve(styles),
+        }
+    }
+}
+
+impl Fold for RawStroke<Length> {
+    type Output = Self;
+
+    fn fold(self, outer: Self::Output) -> Self::Output {
+        Self {
+            paint: self.paint.or(outer.paint),
+            thickness: self.thickness.or(outer.thickness),
+        }
+    }
+}
+
+impl<T: Debug> Debug for RawStroke<T> {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        match (self.paint, &self.thickness) {
+            (Smart::Custom(paint), Smart::Custom(thickness)) => {
+                write!(f, "{thickness:?} + {paint:?}")
+            }
+            (Smart::Custom(paint), Smart::Auto) => paint.fmt(f),
+            (Smart::Auto, Smart::Custom(thickness)) => thickness.fmt(f),
+            (Smart::Auto, Smart::Auto) => f.pad("<stroke>"),
+        }
+    }
+}
+
+dynamic! {
+    RawStroke: "stroke",
+    Value::Length(thickness) => Self {
+        paint: Smart::Auto,
+        thickness: Smart::Custom(thickness),
+    },
+    Value::Color(color) => Self {
+        paint: Smart::Custom(color.into()),
+        thickness: Smart::Auto,
+    },
+}
+
+/// The unresolved length representation.
+///
+/// Currently supports absolute and em units, but support could quite easily be
+/// extended to other units that can be resolved through a style chain.
+/// Probably, it would be a good idea to then move to an enum representation
+/// that has a small footprint and allocates for the rare case that units are
+/// mixed.
+#[derive(Default, Copy, Clone, Eq, PartialEq, Hash)]
+pub struct RawLength {
+    /// The absolute part.
+    pub length: Length,
+    /// The font-relative part.
+    pub em: Em,
+}
+
+impl RawLength {
+    /// The zero length.
+    pub const fn zero() -> Self {
+        Self { length: Length::zero(), em: Em::zero() }
+    }
+}
+
+impl Debug for RawLength {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        match (self.length.is_zero(), self.em.is_zero()) {
+            (false, false) => write!(f, "{:?} + {:?}", self.length, self.em),
+            (true, false) => self.em.fmt(f),
+            (_, true) => self.length.fmt(f),
+        }
+    }
+}
+
+impl Resolve for Em {
+    type Output = Length;
+
+    fn resolve(self, styles: StyleChain) -> Self::Output {
+        if self.is_zero() {
+            Length::zero()
+        } else {
+            self.at(styles.get(TextNode::SIZE))
+        }
+    }
+}
+
+impl Resolve for RawLength {
+    type Output = Length;
+
+    fn resolve(self, styles: StyleChain) -> Self::Output {
+        self.length + self.em.resolve(styles)
+    }
+}
+
+impl Numeric for RawLength {
+    fn zero() -> Self {
+        Self::zero()
+    }
+
+    fn is_finite(self) -> bool {
+        self.length.is_finite() && self.em.is_finite()
+    }
+}
+
+impl PartialOrd for RawLength {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        if self.em.is_zero() && other.em.is_zero() {
+            self.length.partial_cmp(&other.length)
+        } else if self.length.is_zero() && other.length.is_zero() {
+            self.em.partial_cmp(&other.em)
+        } else {
+            None
+        }
+    }
+}
+
+impl From<Length> for RawLength {
+    fn from(length: Length) -> Self {
+        Self { length, em: Em::zero() }
+    }
+}
+
+impl From<Em> for RawLength {
+    fn from(em: Em) -> Self {
+        Self { length: Length::zero(), em }
+    }
+}
+
+impl From<Length> for Relative<RawLength> {
+    fn from(length: Length) -> Self {
+        Relative::from(RawLength::from(length))
+    }
+}
+
+impl Neg for RawLength {
+    type Output = Self;
+
+    fn neg(self) -> Self::Output {
+        Self { length: -self.length, em: -self.em }
+    }
+}
+
+impl Add for RawLength {
+    type Output = Self;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self {
+            length: self.length + rhs.length,
+            em: self.em + rhs.em,
+        }
+    }
+}
+
+sub_impl!(RawLength - RawLength -> RawLength);
+
+impl Mul<f64> for RawLength {
+    type Output = Self;
+
+    fn mul(self, rhs: f64) -> Self::Output {
+        Self {
+            length: self.length * rhs,
+            em: self.em * rhs,
+        }
+    }
+}
+
+impl Div<f64> for RawLength {
+    type Output = Self;
+
+    fn div(self, rhs: f64) -> Self::Output {
+        Self {
+            length: self.length / rhs,
+            em: self.em / rhs,
+        }
+    }
+}
+
+assign_impl!(RawLength += RawLength);
+assign_impl!(RawLength -= RawLength);
+assign_impl!(RawLength *= f64);
+assign_impl!(RawLength /= f64);