Fixed #32 : concept groups are not correctly updated

Fixed #35 : Refactor test helper class (CNC, CC, CIO)
Fixed #36 : Concept values are not used when declared with variable expression
Fixed #37 : Objects in memory lose their values are restart
Fixed #38 : func(a=b, c) (which is not allowed) raise an exception

src/parsers/BaseParser.py

@@ -168,15 +168,22 @@ class BaseParser:
         if expected_parser and parser_input.parser != expected_parser:
             return None
 
-        if len(parser_input.value) == 0:
-            return None
-
-        for node in parser_input.value:
-            from parsers.BaseNodeParser import LexerNode
-            if not isinstance(node, LexerNode):
+        from parsers.BaseNodeParser import LexerNode
+        if isinstance(parser_input.value, list):
+            if len(parser_input.value) == 0:
                 return None
 
-        return parser_input.value
+            for node in parser_input.value:
+                if not isinstance(node, LexerNode):
+                    return None
+
+            return parser_input.value
+
+        else:
+            if not isinstance(parser_input.value, LexerNode):
+                return None
+
+            return [parser_input.value]
 
     @staticmethod
     def get_tokens_boundaries(tokens):