Add stubs for the math functions.

src/bin.rs

@@ -439,6 +439,34 @@ impl CompareContextElement for serde_json::Value {
             .map(IceResult::from_owned),
         }
     }
+
+    fn math_subtract<'a>(&self, other: &dyn ContextElement) -> Option<IceResult<'a>> {
+        todo!()
+    }
+
+    fn math_multiply<'a>(&self, other: &dyn ContextElement) -> Option<IceResult<'a>> {
+        todo!()
+    }
+
+    fn math_divide<'a>(&self, other: &dyn ContextElement) -> Option<IceResult<'a>> {
+        todo!()
+    }
+
+    fn math_modulus<'a>(&self, other: &dyn ContextElement) -> Option<IceResult<'a>> {
+        todo!()
+    }
+
+    fn math_abs<'a>(&self) -> Option<IceResult<'a>> {
+        todo!()
+    }
+
+    fn math_floor<'a>(&self) -> Option<IceResult<'a>> {
+        todo!()
+    }
+
+    fn math_ceil<'a>(&self) -> Option<IceResult<'a>> {
+        todo!()
+    }
 }
 
 #[derive(Debug)]

src/renderer/context_element.rs

@@ -69,6 +69,13 @@ pub trait CompareContextElement: CastToAny {
     fn partial_compare(&self, other: &dyn ContextElement) -> Option<Ordering>;
 
     fn math_add<'a>(&self, other: &dyn ContextElement) -> Option<IceResult<'a>>;
+    fn math_subtract<'a>(&self, other: &dyn ContextElement) -> Option<IceResult<'a>>;
+    fn math_multiply<'a>(&self, other: &dyn ContextElement) -> Option<IceResult<'a>>;
+    fn math_divide<'a>(&self, other: &dyn ContextElement) -> Option<IceResult<'a>>;
+    fn math_modulus<'a>(&self, other: &dyn ContextElement) -> Option<IceResult<'a>>;
+    fn math_abs<'a>(&self) -> Option<IceResult<'a>>;
+    fn math_floor<'a>(&self) -> Option<IceResult<'a>>;
+    fn math_ceil<'a>(&self) -> Option<IceResult<'a>>;
 }
 
 impl<C: 'static + ContextElement> CastToAny for C {

src/renderer/parameters_context.rs

@@ -373,4 +373,32 @@ impl CompareContextElement for OwnedLiteral {
             },
         }
     }
+
+    fn math_subtract<'a>(&self, other: &dyn ContextElement) -> Option<IceResult<'a>> {
+        todo!()
+    }
+
+    fn math_multiply<'a>(&self, other: &dyn ContextElement) -> Option<IceResult<'a>> {
+        todo!()
+    }
+
+    fn math_divide<'a>(&self, other: &dyn ContextElement) -> Option<IceResult<'a>> {
+        todo!()
+    }
+
+    fn math_modulus<'a>(&self, other: &dyn ContextElement) -> Option<IceResult<'a>> {
+        todo!()
+    }
+
+    fn math_abs<'a>(&self) -> Option<IceResult<'a>> {
+        todo!()
+    }
+
+    fn math_floor<'a>(&self) -> Option<IceResult<'a>> {
+        todo!()
+    }
+
+    fn math_ceil<'a>(&self) -> Option<IceResult<'a>> {
+        todo!()
+    }
 }