Fix: quotes inside features names with spaces

flamapy/core/models/ast.py

@@ -56,7 +56,7 @@ def is_binary_op(self) -> bool:
         return not self.is_unique_term() and not self.is_unary_op()
 
     def __str__(self) -> str:
-        data = self.data.value if self.is_op() else self.data
+        data = self.data.value if self.is_op() else safename(str(self.data))
         if self.left and self.right:
             return f'{data}[{self.left}][{self.right}]'
         if self.left and not self.right:
@@ -73,11 +73,11 @@ def _get_pretty_str_node(node: 'Node') -> str:
             if node.is_binary_op():
                 res = f'({res})'
         else:
-            res = str(node)
+            res = safename(str(node))
         return res
 
     def pretty_str(self) -> str:
-        data = self.data.value if self.is_op() else self.data
+        data = self.data.value if self.is_op() else safename(str(self.data))
         left = Node._get_pretty_str_node(self.left) if self.left is not None else ''
         right = Node._get_pretty_str_node(self.right) if self.right is not None else ''
 
@@ -302,3 +302,7 @@ def get_clause_from_or_node(node: Node) -> list[Any]:
         term = node.right.data if node.right.is_term() else f'-{node.right.left.data}'
         clause.append(term)
     return clause
+
+
+def safename(name: str) -> str:
+    return f'"{name}"' if ' ' in name else name