Don't allow compound events in EventBuffer

pynars/NARS/Control/Reasoner.py

@@ -137,7 +137,7 @@ def observe(self, tasks_derived: List[Task]):
             task_in: Task = channel.take()
             if task_in is not None:
                 self.overall_experience.put(task_in)
-                if task_in.is_event:
+                if self.event_buffer.can_task_enter(task_in):
                     self.event_buffer.put(task_in)
                     # when there's a new event, run the temporal chaining
                     temporal_results = self.event_buffer.generate_temporal_sentences()

pynars/NARS/DataStructures/_py/Buffer.py

@@ -80,9 +80,7 @@ def generate_temporal_sentences(self):
         return results
 
     def put(self, event_task_to_insert: Task):
-        if not event_task_to_insert.is_event \
-            or event_task_to_insert.term.type != TermType.STATEMENT \
-            or event_task_to_insert.term.is_higher_order:
+        if not self.can_task_enter(event_task_to_insert):
             print("ERROR! Only events with first-order statements can enter the EventBuffer.")
             return
 
@@ -107,4 +105,9 @@ def put(self, event_task_to_insert: Task):
 
         if len(self.buffer) > self.capacity:
             # if too many events, take out the oldest event
-            self.buffer.pop(0)
+            self.buffer.pop(0)
+
+    def can_task_enter(self, task: Task):
+       return task.is_event \
+            and task.term.type == TermType.STATEMENT \
+            and not task.term.is_higher_order