Enhanced PythonEvaluator to accept concepts

core/builtin_concepts.py

@@ -6,6 +6,12 @@ from core.concept import Concept
 class BuiltinConcepts(Enum):
     """
     List of builtin concepts that do no need any specific implementation
+    Please note that the value of the enum is informal. It is not used in the system
+    For example, the concept 'NODE' DOES NOT have the key, the id or whatever 200
+    The key if the name of the concept
+    The id is a sequential number given just before the concept is saved in sdp
+
+    The values of the enum are just a convenient way for me to group the concepts
     """
     SHEERKA = 1
     SUCCESS = 2
@@ -31,6 +37,12 @@ class BuiltinConcepts(Enum):
     NOP = 22  # no operation concept. Does nothing
     PROPERTY_EVAL_ERROR = 23  # cannot evaluate a property of a concept
     ENUMERATION = 24  # represents a list or a set
+    LIST = 25  # represents a list
+    CANNOT_RESOLVE_VALUE_ERROR = 26  # In presence of a concept where the default value is not know
+
+    NODE = 200
+    GENERIC_NODE = 201
+    IDENTIFIER_NODE = 202
 
 
 """
@@ -234,3 +246,36 @@ class PropertyEvalError(Concept):
     @property
     def property_name(self):
         return self.body
+
+
+class EnumerationConcept(Concept):
+    def __init__(self, iteration=None):
+        super().__init__(BuiltinConcepts.ENUMERATION, True, False, BuiltinConcepts.ENUMERATION)
+        self.body = iteration
+
+    def __iter__(self):
+        return iter(self.body)
+
+
+class ListConcept(Concept):
+    def __init__(self, items=None):
+        super().__init__(BuiltinConcepts.LIST, True, False, BuiltinConcepts.LIST)
+        self.body = items or []
+
+    def append(self, obj):
+        self.body.append(obj)
+
+    def __len__(self):
+        return len(self.body)
+
+    def __getitem__(self, key):
+        return self.body[key]
+
+    def __setitem__(self, key, value):
+        self.body[key] = value
+
+    def __iter__(self):
+        return iter(self.body)
+
+    def __contains__(self, item):
+        return item in self.body