Make functions to access operator and children of a Node public.

CHANGELOG.md

@@ -6,6 +6,8 @@
 
 ### Added
 
+ * Public immutable and mutable accessor functions to the operator and children of a Node.
+
 ### Removed
 
 ### Changed

src/tree/mod.rs

@@ -378,14 +378,30 @@ impl Node {
         self.eval_empty_with_context_mut(&mut HashMapContext::new())
     }
 
-    fn children(&self) -> &[Node] {
+    /// Returns the children of this node as a slice.
+    pub fn children(&self) -> &[Node] {
         &self.children
     }
 
-    fn operator(&self) -> &Operator {
+    /// Returns the operator associated with this node.
+    pub fn operator(&self) -> &Operator {
         &self.operator
     }
 
+    /// Returns a mutable reference to the vector containing the children of this node.
+    ///
+    /// WARNING: Writing to this might have unexpected results, as some operators require certain amounts and types of arguments.
+    pub fn children_mut(&mut self) -> &mut Vec<Node> {
+        &mut self.children
+    }
+
+    /// Returns a mutable reference to the operator associated with this node.
+    ///
+    /// WARNING: Writing to this might have unexpected results, as some operators require different amounts and types of arguments.
+    pub fn operator_mut(&mut self) -> &mut Operator {
+        &mut self.operator
+    }
+
     fn has_enough_children(&self) -> bool {
         Some(self.children().len()) == self.operator().max_argument_amount()
     }