1 files changed, 52 insertions, 0 deletions
diff --git a/src/library/layout/spacing.rs b/src/library/layout/spacing.rs
new file mode 100644
index 00000000..3bebfb14
--- /dev/null
+++ b/src/library/layout/spacing.rs
@@ -0,0 +1,52 @@
+use crate::library::prelude::*;
+
+/// Horizontal spacing.
+pub struct HNode;
+
+#[class]
+impl HNode {
+    fn construct(_: &mut Context, args: &mut Args) -> TypResult<Template> {
+        Ok(Template::Horizontal(args.expect("spacing")?))
+    }
+}
+
+/// Vertical spacing.
+pub struct VNode;
+
+#[class]
+impl VNode {
+    fn construct(_: &mut Context, args: &mut Args) -> TypResult<Template> {
+        Ok(Template::Vertical(args.expect("spacing")?))
+    }
+}
+
+/// Kinds of spacing.
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+pub enum SpacingKind {
+    /// A length stated in absolute values and/or relative to the parent's size.
+    Linear(Linear),
+    /// A length that is the fraction of the remaining free space in the parent.
+    Fractional(Fractional),
+}
+
+impl SpacingKind {
+    /// Whether this is fractional spacing.
+    pub fn is_fractional(self) -> bool {
+        matches!(self, Self::Fractional(_))
+    }
+}
+
+impl From<Length> for SpacingKind {
+    fn from(length: Length) -> Self {
+        Self::Linear(length.into())
+    }
+}
+
+castable! {
+    SpacingKind,
+    Expected: "linear or fractional",
+    Value::Length(v) => Self::Linear(v.into()),
+    Value::Relative(v) => Self::Linear(v.into()),
+    Value::Linear(v) => Self::Linear(v),
+    Value::Fractional(v) => Self::Fractional(v),
+}