Bodiless math implementation.

src/renderer/renderer.rs

@@ -656,9 +656,14 @@ impl<'a> DustRenderer<'a> {
                     ParametersContext::new(self, breadcrumbs, &parameterized_block.params, None);
                 match &parameterized_block.contents {
                     None => {
-                        // TODO: math without body, calculate the value and render it
+                        return self
-                        // Calculate the value
+                            .perform_math_operation(breadcrumbs, &param_map)
-                        // Render
+                            .map(|final_val| {
+                                final_val
+                                    .get_context_element_reference()
+                                    .render(&Vec::new())
+                            })
+                            .unwrap_or(Ok("".to_owned()));
                     }
                     Some(_) => {
                         // TODO: math with body, calculate the value and use it like a select block
@@ -931,7 +936,7 @@ impl<'a> DustRenderer<'a> {
     /// Performs a math operation (add, subtract, multiply, divide,
     /// mod, abs, floor, ceil) and returns the result or None if
     /// nothing should be rendered.
-    fn performance_math_operation(
+    fn perform_math_operation(
         &'a self,
         breadcrumbs: &'a Vec<BreadcrumbTreeElement<'a>>,
         math_parameters: &'a ParametersContext<'a>,
@@ -959,8 +964,11 @@ impl<'a> DustRenderer<'a> {
                 .map(|ice| ice.get_context_element_reference())
         });
 
-        match method_rendered.as_str() {
+        return match method_rendered.as_str() {
-            "add" => todo!(),
+            "add" => match (left_side_ce, right_side_ce) {
+                (None, _) | (Some(Err(_)), _) | (_, None) | (_, Some(Err(_))) => None,
+                (Some(Ok(l)), Some(Ok(r))) => l.math_add(r),
+            },
             "subtract" => todo!(),
             "multiply" => todo!(),
             "divide" => todo!(),
@@ -968,10 +976,8 @@ impl<'a> DustRenderer<'a> {
             "abs" => todo!(),
             "floor" => todo!(),
             "ceil" => todo!(),
-            _ => return None,
+            _ => None,
-        }
+        };
-
-        todo!()
     }
 }