Fixed BNF parsing issues

tests/non_reg/test_sheerka_non_reg.py

@@ -11,6 +11,16 @@ from tests.TestUsingFileBasedSheerka import TestUsingFileBasedSheerka
 
 class TestSheerkaNonReg(TestUsingFileBasedSheerka):
 
+    def init_scenario(self, init_expressions):
+        sheerka = self.get_sheerka()
+
+        for expression in init_expressions:
+            res = sheerka.evaluate_user_input(expression)
+            assert len(res) == 1, f"Failed to execute '{expression}'"
+            assert res[0].status, f"Error while executing '{expression}'"
+
+        return sheerka
+
     @pytest.mark.parametrize("text, expected", [
         ("1 + 1", 2),
         ("sheerka.test()", 'I have access to Sheerka !')
@@ -522,8 +532,6 @@ as:
         assert res[0].body == 21
 
     def test_i_can_mix_concept_of_concept(self):
-        sheerka = self.get_sheerka()
-
         definitions = [
             "def concept one as 1",
             "def concept two as 2",
@@ -531,8 +539,7 @@ as:
             "def concept a plus b as a + b"
         ]
 
-        for definition in definitions:
-            sheerka.evaluate_user_input(definition)
+        sheerka = self.init_scenario(definitions)
 
         res = sheerka.evaluate_user_input("eval 1 plus 2")
         assert len(res) == 1
@@ -584,14 +591,28 @@ as:
         assert res[0].status
         assert res[0].body == 43
 
+    def test_i_can_use_bnf_alias(self):
+        definitions = [
+            "def concept two as 2",
+            "def concept number",
+            "two isa number",
+            "def concept plus_one from bnf number=n1 'plus_one' as n1 + 1",
+        ]
+
+        sheerka = self.init_scenario(definitions)
+
+        res = sheerka.evaluate_user_input("eval two plus_one")
+        assert len(res) == 1
+        assert res[0].status
+        assert res[0].body == 3
+
     @pytest.mark.xfail
-    def test_i_can_evaluate_concept_of_concept_when_multiple_choices(self):
+    def test_i_can_recognize_composition_of_concept(self):
         sheerka = self.get_sheerka()
 
         definitions = [
             "def concept little a where a",
             "def concept blue a where a",
-            "def concept little blue a where a",
             "def concept house"
         ]
 
@@ -610,6 +631,24 @@ as:
         assert res[1].status
         assert res[1].body == "little blue(house)"
 
+    @pytest.mark.xfail
+    def test_i_can_recognize_composition_of_concept_with_priority(self):
+        sheerka = self.get_sheerka()
+
+        definitions = [
+            "def concept a plus b where a,b",
+            "def concept a times b where a,b",
+            "modify concept 1001 set priority = 1",
+            "modify concept 1002 set priority = 2",
+        ]
+
+        for definition in definitions:
+            sheerka.evaluate_user_input(definition)
+
+        res = sheerka.evaluate_user_input("1 plus 2 times 3")
+        assert res[0].status
+        # check that the priority is applied
+
     def test_i_can_say_that_a_concept_isa_another_concept(self):
         sheerka = self.get_sheerka()
         sheerka.evaluate_user_input("def concept foo")
@@ -790,6 +829,27 @@ as:
         assert not res[0].status
         assert sheerka.isinstance(res[0].body, BuiltinConcepts.WHERE_CLAUSE_FAILED)
 
+    @pytest.mark.xfail
+    def test_i_can_manage_missing_variables_from_bnf_parsing(self):
+        definitions = [
+            "def concept one as 1",
+            "def concept number",
+            "one isa number",
+            "def concept hundreds from bnf number=n1 'hundred' ('and' number=n2)? where n1<10 and n2<100 as n1 * 100 + n2",
+        ]
+
+        sheerka = self.init_scenario(definitions)
+
+        res = sheerka.evaluate_user_input("one hundred")
+        assert len(res) == 1
+        assert res[0].status
+        assert sheerka.isinstance(res[0].body, "hundreds")
+
+        res = sheerka.evaluate_user_input("eval one hundred")
+        assert len(res) == 1
+        assert res[0].status
+        assert res[0].body == "100"
+
     def test_i_can_say_than_bnf_concept_isa_another_concept(self):
         sheerka = self.get_sheerka()
         sheerka.evaluate_user_input("def concept number")

tests/parsers/test_BnfParser.py

@@ -16,9 +16,9 @@ class ClassWithName:
         self.name = name
 
 
-def c(name):
+def c(name, rule_name=None):
     concept = Concept(name).init_key()
-    return ConceptExpression(concept, rule_name=name)
+    return ConceptExpression(concept, rule_name=rule_name or name)
 
 
 eof_token = Token(TokenKind.EOF, "", 0, 0, 0)
@@ -94,6 +94,7 @@ class TestBnfParser(TestUsingMemoryBasedSheerka):
         ("foo | bar?", OrderedChoice(c("foo"), Optional(c("bar")))),
         ("'str' = var", Sequence(StrMatch("str"), StrMatch("="), c("var"))),
         ("'str''='var", Sequence(StrMatch("str"), StrMatch("="), c("var"))),
+        ("foo=f", c("foo", "f")),
     ])
     def test_i_can_parse_regex_with_concept(self, expression, expected):
         foo = Concept("foo")
@@ -111,10 +112,11 @@ class TestBnfParser(TestUsingMemoryBasedSheerka):
         assert res.value.value == expected
         assert res.value.source == expression
 
-    def test_i_can_parse_regex_with_concept_when_the_concept_is_still_under_definition(self):
-        expression = "foo"
-        expected = ConceptExpression("foo")
-
+    @pytest.mark.parametrize("expression, expected", [
+        ("foo", ConceptExpression("foo")),
+        ("foo=f", ConceptExpression("foo", rule_name="f")),
+    ])
+    def test_i_can_parse_regex_with_concept_when_the_concept_is_still_under_definition(self, expression, expected):
         context = self.get_context()
         context.obj = ClassWithName("foo")