Reimplemented explain feature

src/core/sheerka/ExecutionContext.py

@@ -50,9 +50,10 @@ class ExecutionContext:
         self._parent = None
         self._id = ExecutionContext.get_id(event.get_digest()) if event else None
         self._tab = ""
-        self._bag = {}  # other variables
-        self._start = 0
-        self._stop = 0
+        self._bag = {}  # context variables
+        self._start = 0  # when the execution starts (to measure elapsed time)
+        self._stop = 0  # when the execution stops (to measure elapses time)
+        self._format_instructions = None # how to print the execution context
 
         self.who = who  # who is asking
         self.event = event  # what was the (original) trigger
@@ -65,11 +66,13 @@ class ExecutionContext:
         self.global_hints = set() if global_hints is None else global_hints
         self.global_errors = [] if global_errors is None else global_errors
 
+
         self.inputs = {}  # what was the parameters of the execution context
         self.values = {}  # what was produced by the execution context
 
-        self.obj = kwargs.pop("obj", None)
-        self.concepts = kwargs.pop("concepts", {})
+        self.obj = kwargs.pop("obj", None)  # current obj we are working on
+        self.concepts = kwargs.pop("concepts", {})  # known concepts specific to this context
+
         # update the other elements
         for k, v in kwargs.items():
             self._bag[k] = v
@@ -313,7 +316,7 @@ class ExecutionContext:
                 return None
             return ret_val.status
 
-    def to_bag(self):
+    def as_bag(self):
         """
         Creates a dictionary with the useful properties of the concept
         It quicker to implement than creating the actual property mechanism with @property
@@ -338,3 +341,9 @@ class ExecutionContext:
             value = value[:47] + "..."
         to_str = f"ReturnValue(who={r.who}, status={r.status}, value={value})"
         return to_str
+
+    def get_format_instructions(self):
+        return self._format_instructions
+
+    def set_format_instructions(self, instructions):
+        self._format_instructions = instructions