Add stubs for MathNumber.

src/renderer/math.rs

@@ -1,6 +1,10 @@
 use crate::parser::OwnedLiteral;
 use std::convert::TryInto;
 use std::ops::Add;
+use std::ops::Div;
+use std::ops::Mul;
+use std::ops::Rem;
+use std::ops::Sub;
 
 #[derive(Debug)]
 pub enum MathNumber {
@@ -44,6 +48,50 @@ impl Add<MathNumber> for MathNumber {
     }
 }
 
+impl Sub<MathNumber> for MathNumber {
+    type Output = Option<OwnedLiteral>;
+
+    fn sub(self, other: MathNumber) -> Self::Output {
+        todo!()
+    }
+}
+
+impl Mul<MathNumber> for MathNumber {
+    type Output = Option<OwnedLiteral>;
+
+    fn mul(self, other: MathNumber) -> Self::Output {
+        todo!()
+    }
+}
+
+impl Div<MathNumber> for MathNumber {
+    type Output = Option<OwnedLiteral>;
+
+    fn div(self, other: MathNumber) -> Self::Output {
+        todo!()
+    }
+}
+
+impl Rem<MathNumber> for MathNumber {
+    type Output = Option<OwnedLiteral>;
+
+    fn rem(self, other: MathNumber) -> Self::Output {
+        todo!()
+    }
+}
+
+impl MathNumber {
+    fn math_abs(&self) -> Option<OwnedLiteral> {
+        todo!()
+    }
+    fn math_floor(&self) -> Option<OwnedLiteral> {
+        todo!()
+    }
+    fn math_ceil(&self) -> Option<OwnedLiteral> {
+        todo!()
+    }
+}
+
 /// For math operations that take in integers and return integers
 /// (add, subtract, multiply)
 pub fn math_ints<L, R, F>(left: L, right: R, operation: F) -> Option<OwnedLiteral>