Many more expressions 🥗

Boolean, equality, comparison and assignment expression parsing and evaluation.

3 files changed, 14 insertions, 4 deletions

diff --git a/src/geom/length.rs b/src/geom/length.rs
index 1a45c63c..db28761b 100644
--- a/src/geom/length.rs
+++ b/src/geom/length.rs
@@ -81,6 +81,11 @@ impl Length {
         Self { raw: self.raw.max(other.raw) }
     }
 
+    /// Whether the length is zero.
+    pub fn is_zero(self) -> bool {
+        self.raw == 0.0
+    }
+
     /// Whether the length is finite.
     pub fn is_finite(self) -> bool {
         self.raw.is_finite()
diff --git a/src/geom/linear.rs b/src/geom/linear.rs
index 5638517b..05990096 100644
--- a/src/geom/linear.rs
+++ b/src/geom/linear.rs
@@ -26,9 +26,9 @@ impl Linear {
         self.rel.resolve(length) + self.abs
     }
 
-    /// Whether this linear's relative part is zero.
-    pub fn is_absolute(self) -> bool {
-        self.rel == Relative::ZERO
+    /// Whether both parts are zero.
+    pub fn is_zero(self) -> bool {
+        self.rel.is_zero() && self.abs.is_zero()
     }
 }
 
diff --git a/src/geom/relative.rs b/src/geom/relative.rs
index e91ea672..cea7e4e3 100644
--- a/src/geom/relative.rs
+++ b/src/geom/relative.rs
@@ -27,12 +27,17 @@ impl Relative {
     /// Resolve this relative to the given `length`.
     pub fn resolve(self, length: Length) -> Length {
         // Zero wins over infinity.
-        if self.0 == 0.0 {
+        if self.is_zero() {
             Length::ZERO
         } else {
             self.get() * length
         }
     }
+
+    /// Whether the ratio is zero.
+    pub fn is_zero(self) -> bool {
+        self.0 == 0.0
+    }
 }
 
 impl Display for Relative {