Fixed #101 : Implement PLURIAL

Fixed #103 : Implement PlurialNodeParser
Fixed #104 : Implement dynamic concept
Fixed #107 : PrepareEvalxxxEvaluator: context hints are lost on a second evaluation

tests/parsers/test_SequenceNodeParser.py

@@ -229,11 +229,13 @@ class TestSequenceNodeParser(TestUsingMemoryBasedSheerka):
         sheerka, context, parser = self.init_parser(concepts_map)
 
         res = parser.parse(context, ParserInput("a special concept"))
+        assert res.status
         lexer_nodes = res.body.body
         expected_array = compute_expected_array(concepts_map, "a special concept", ["a special concept"])
         compare_with_test_object(lexer_nodes, expected_array)
 
         res = parser.parse(context, ParserInput("isa"))
+        assert res.status
         lexer_nodes = res.body.body
         expected_array = compute_expected_array(concepts_map, "isa", ["isa"])
         compare_with_test_object(lexer_nodes, expected_array)
@@ -442,3 +444,22 @@ class TestSequenceNodeParser(TestUsingMemoryBasedSheerka):
         for node in res.body.body:
             if hasattr(node, "concept"):
                 assert node.concept.get_hints().use_copy
+
+    def test_i_can_parse_plural(self):
+        concepts_map = {
+            "boy": Concept("boy"),
+        }
+
+        sheerka, context, parser = self.init_parser(concepts_map)
+        boy = concepts_map['boy']
+
+        res = parser.parse(context, ParserInput("boys"))
+        assert res.status
+        lexer_nodes = res.body.body
+        assert len(lexer_nodes) == 1
+
+        concept_found = lexer_nodes[0].concept
+        assert concept_found.id == f"{boy.id}-{BuiltinConcepts.PLURAL}"
+        assert concept_found.name == "boys"
+        assert concept_found.key == "boys"
+        assert concept_found.get_prop(BuiltinConcepts.PLURAL) == boy