Added chicken and egg recursion detection

_concepts.txt

@@ -40,3 +40,6 @@ eighteen isa number
 nineteen isa number
 twenty isa number
 def concept twenties from bnf twenty number where number < 10 as twenty + number
+def concept thirty as 30
+def concept forty as 40
+

src/core/builtin_concepts.py

@@ -51,6 +51,7 @@ class BuiltinConcepts(Enum):
     REDUCE_REQUESTED = "reduce requested"  # remove meaningless error when possible
     NOT_A_SET = "not a set"  # the concept has no entry in sets
     WHERE_CLAUSE_FAILED = "where clause failed"  # failed to validate where clause during evaluation
+    CHICKEN_AND_EGG = "chicken and egg"  # infinite recursion when declaring concept
 
     NODE = "node"
     GENERIC_NODE = "generic node"
@@ -92,7 +93,8 @@ BuiltinErrors = [str(e) for e in {
     BuiltinConcepts.CONCEPT_EVAL_ERROR,
     BuiltinConcepts.CONCEPT_ALREADY_IN_SET,
     BuiltinConcepts.NOT_A_SET,
-    BuiltinConcepts.WHERE_CLAUSE_FAILED
+    BuiltinConcepts.WHERE_CLAUSE_FAILED,
+    BuiltinConcepts.CHICKEN_AND_EGG
 }]
 
 """

src/core/builtin_helpers.py

@@ -4,7 +4,6 @@ import logging
 import core.ast.nodes
 from core.ast.nodes import CallNodeConcept, GenericNodeConcept
 from core.ast.visitors import UnreferencedNamesVisitor
-
 from core.builtin_concepts import BuiltinConcepts
 
 
@@ -100,11 +99,22 @@ def expect_one(context, return_values, logger=None):
             return_values[0],
             parents=return_values)
     else:
-        return sheerka.ret(
-            context.who,
-            False,
-            sheerka.new(BuiltinConcepts.TOO_MANY_ERRORS, body=return_values),
-            parents=return_values)
+        # test if only one evaluator in error
+        from evaluators.OneErrorEvaluator import OneErrorEvaluator
+        one_error_evaluator = OneErrorEvaluator()
+        reduce_requested = sheerka.ret(context.who, True, sheerka.new(BuiltinConcepts.REDUCE_REQUESTED))
+        if one_error_evaluator.matches(context, return_values + [reduce_requested]):
+            return sheerka.ret(
+                context.who,
+                False,
+                one_error_evaluator.eval(context, return_values).body,
+                parents=return_values)
+        else:
+            return sheerka.ret(
+                context.who,
+                False,
+                sheerka.new(BuiltinConcepts.TOO_MANY_ERRORS, body=return_values),
+                parents=return_values)
 
 
 def get_names(sheerka, concept_node):
@@ -210,5 +220,3 @@ def _extract_predicates(sheerka, node, variables_to_include, variables_to_exclud
                 predicates.append(res)
 
     return predicates
-
-

src/core/concept.py

@@ -242,24 +242,24 @@ class Concept:
     def body(self):
         return self.values[ConceptParts.BODY] if ConceptParts.BODY in self.values else None
 
-    def add_codes(self, codes):
-        """
-        Gets the ASTs for 'where', 'pre', 'post' and 'body'
-        There ASTs are know when the concept is freshly parsed.
-        So the values are kept in cache.
-
-        For concepts loaded from sdp, these ASTs must be created again
-        TODO : Seems to be a service method. Can be put somewhere else
-        :param codes:
-        :return:
-        """
-        if codes is None:
-            return
-
-        for key in codes:
-            self.compiled[key] = codes[key]
-
-        return self
+    # def add_codes(self, codes):
+    #     """
+    #     Gets the ASTs for 'where', 'pre', 'post' and 'body'
+    #     There ASTs are know when the concept is freshly parsed.
+    #     So the values are kept in cache.
+    #
+    #     For concepts loaded from sdp, these ASTs must be created again
+    #     TODO : Seems to be a service method. Can be put somewhere else
+    #     :param codes:
+    #     :return:
+    #     """
+    #     if codes is None:
+    #         return
+    #
+    #     for key in codes:
+    #         self.compiled[key] = codes[key]
+    #
+    #     return self
 
     def get_digest(self):
         """
@@ -406,3 +406,12 @@ class DoNotResolve:
     set concept.compiled[BODY] to DoNotResolve(value)
     """
     value: object
+
+
+@dataclass()
+class InfiniteRecursionResolved:
+    """This class is used to when we managed to break an infinite recursion concept definition"""
+    value: object
+
+    def get_value(self):
+        return self.value

src/core/sheerka/ExecutionContext.py

@@ -222,6 +222,8 @@ class ExecutionContext:
             to_str = self.return_value_to_str(r)
             logger.debug(f"[{self._id:2}]" + self._tab + "-> " + to_str)
 
+    def get_parent(self):
+        return self._parent
 
     @staticmethod
     def return_value_to_str(r):

src/core/sheerka/Services/SheerkaDump.py

@@ -1,6 +1,7 @@
 from core.builtin_concepts import BuiltinConcepts
 from core.concept import Concept
-from sdp.sheerkaDataProvider import SheerkaDataProvider
+from core.sheerka.ExecutionContext import ExecutionContext
+from sdp.sheerkaDataProvider import SheerkaDataProvider, Event
 import pprint
 import os
 
@@ -28,7 +29,7 @@ class SheerkaDump:
         defs = self.sheerka.sdp.get(self.sheerka.CONCEPTS_DEFINITIONS_ENTRY)
         self.sheerka.log.info(defs)
 
-    def dump_desc(self, *concept_names):
+    def dump_desc(self, *concept_names, eval=False):
         first = True
         for concept_name in concept_names:
             if isinstance(concept_name, Concept):
@@ -43,13 +44,20 @@ class SheerkaDump:
                 concepts = [concepts]
 
             for c in concepts:
+                if eval:
+                    event = Event(f"Evaluating {c}", "")
+                    context = ExecutionContext("dump_desc", event, self.sheerka)
+                    evaluated = self.sheerka.evaluate_concept(context, c)
+                    value = evaluated.body if evaluated.key == c.key else evaluated
+
                 if not first:
                     self.sheerka.log.info("")
                 self.sheerka.log.info(f"name   : {c.name}")
                 self.sheerka.log.info(f"bnf    : {c.metadata.definition}")
                 self.sheerka.log.info(f"key    : {c.key}")
                 self.sheerka.log.info(f"body   : {c.metadata.body}")
-                self.sheerka.log.info(f"value  : {c.body}")
+                if eval:
+                    self.sheerka.log.info(f"value  : {value}")
                 self.sheerka.log.info(f"digest : {c.get_digest()}")
 
                 if self.sheerka.isaset(c):

src/core/sheerka/Services/SheerkaEvaluateConcept.py

@@ -1,5 +1,5 @@
 from core.builtin_concepts import BuiltinConcepts
-from core.concept import Concept, DoNotResolve, ConceptParts
+from core.concept import Concept, DoNotResolve, ConceptParts, InfiniteRecursionResolved
 import core.builtin_helpers
 
 CONCEPT_EVALUATION_STEPS = [
@@ -13,6 +13,55 @@ class SheerkaEvaluateConcept:
         self.sheerka = sheerka
         self.logger_name = self.evaluate_concept.__name__
 
+    @staticmethod
+    def infinite_recursion_detected(context, concept):
+        if concept is None:
+            return False
+
+        parent = context.get_parent()
+        while parent is not None:
+            if parent.who == context.who and parent.obj == concept:
+                return True
+
+            parent = parent.get_parent()
+
+        return False
+
+    @staticmethod
+    def get_infinite_recursion_resolution(obj):
+        if isinstance(obj, InfiniteRecursionResolved):
+            return obj
+
+        if isinstance(obj, Concept) and isinstance(obj.body, InfiniteRecursionResolved):
+            return obj.body
+
+        return None
+
+    def manage_infinite_recursion(self, context):
+        """
+        We look for the fist parent that has a body that means something
+        We use the eval function with no local or global
+        :param context:
+        :return:
+        """
+
+        parent = context
+        concepts_found = set()
+        while parent and parent.obj:
+            if parent.who == context.who and parent.desc == context.desc:
+                body = parent.obj.metadata.body
+                try:
+                    return self.sheerka.ret(self.logger_name, True, InfiniteRecursionResolved(eval(body)))
+                except Exception:
+                    pass
+                concepts_found.add(parent.obj)
+            parent = parent.get_parent()
+
+        return self.sheerka.ret(
+            self.logger_name,
+            False,
+            self.sheerka.new(BuiltinConcepts.CHICKEN_AND_EGG, body=concepts_found))
+
     def initialize_concept_asts(self, context, concept: Concept, logger=None):
         """
         Updates the codes of the newly created concept
@@ -75,6 +124,15 @@ class SheerkaEvaluateConcept:
         if isinstance(to_resolve, DoNotResolve):
             return to_resolve.value
 
+        # manage infinite loop
+        if self.infinite_recursion_detected(context, current_concept):
+            with context.push(desc="Infinite recursion detected", obj=current_concept) as sub_context:
+                # I create a sub context in order to log what happened
+                sub_context.log_new(logger)
+                ret_val = self.manage_infinite_recursion(context)
+                sub_context.add_values(return_values=ret_val)
+                return ret_val.body
+
         desc = f"Evaluating {current_prop} (concept={current_concept})"
         context.log(logger, desc, self.logger_name)
         with context.push(desc=desc, obj=current_concept) as sub_context:
@@ -92,7 +150,8 @@ class SheerkaEvaluateConcept:
 
             # otherwise, execute all return values to find out what is the value
             else:
-                r = self.sheerka.execute(sub_context, to_resolve, CONCEPT_EVALUATION_STEPS, logger)
+                use_copy = [r for r in to_resolve] if hasattr(to_resolve, "__iter__") else to_resolve
+                r = self.sheerka.execute(sub_context, use_copy, CONCEPT_EVALUATION_STEPS, logger)
                 one_r = core.builtin_helpers.expect_one(context, r)
                 sub_context.add_values(return_values=one_r)
                 if one_r.status:
@@ -100,10 +159,11 @@ class SheerkaEvaluateConcept:
                 else:
                     error = one_r.value
 
-            return self.sheerka.new(BuiltinConcepts.CONCEPT_EVAL_ERROR,
-                                    body=error,
-                                    concept=current_concept,
-                                    property_name=current_prop)
+            return error if self.sheerka.isinstance(error, BuiltinConcepts.CHICKEN_AND_EGG) \
+                else self.sheerka.new(BuiltinConcepts.CONCEPT_EVAL_ERROR,
+                                      body=error,
+                                      concept=current_concept,
+                                      property_name=current_prop)
 
     def resolve_list(self, context, list_to_resolve, current_prop, current_concept, logger):
         """When dealing with a list, there are two possibilities"""
@@ -168,7 +228,7 @@ class SheerkaEvaluateConcept:
                     else:
                         # Do not send the current concept for the properties
                         resolved = self.resolve(context, prop_ast, prop_name, None, logger)
-                    if context.sheerka.isinstance(resolved, BuiltinConcepts.CONCEPT_EVAL_ERROR):
+                    if isinstance(resolved, Concept) and not context.sheerka.is_success(resolved):
                         resolved.set_prop("concept", concept)  # since current concept was not sent
                         return resolved
                     else:
@@ -178,10 +238,10 @@ class SheerkaEvaluateConcept:
                 if part_key in concept.compiled and concept.compiled[part_key] is not None:
                     metadata_ast = concept.compiled[part_key]
                     resolved = self.resolve(context, metadata_ast, part_key, concept, logger)
-                    if context.sheerka.isinstance(resolved, BuiltinConcepts.CONCEPT_EVAL_ERROR):
+                    if isinstance(resolved, Concept) and not context.sheerka.is_success(resolved):
                         return resolved
                     else:
-                        concept.values[part_key] = resolved
+                        concept.values[part_key] = self.get_infinite_recursion_resolution(resolved) or resolved
 
         # validate where clause
         if concept.metadata.where is not None:

src/core/sheerka/Sheerka.py

@@ -249,11 +249,12 @@ class Sheerka(Concept):
             if not self.skip_builtins_in_db:
                 self.sdp.save_result(self, execution_context)
 
-            # hack to save valid concept definition
-            if not self.during_restore:
-                if len(ret) == 1 and ret[0].status and self.isinstance(ret[0].value, BuiltinConcepts.NEW_CONCEPT):
-                    with open(CONCEPTS_FILE, "a") as f:
-                        f.write(text + "\n")
+        # hack to save valid concept definition
+        # if not self.during_restore:
+        #     if len(ret) == 1 and ret[0].status and self.isinstance(ret[0].value, BuiltinConcepts.NEW_CONCEPT):
+        #         with open(CONCEPTS_FILE, "a") as f:
+        #             f.write(text + "\n")
+
         return ret
 
     def execute(self, execution_context, return_values, execution_steps, logger=None):
@@ -364,19 +365,26 @@ class Sheerka(Concept):
             concept_key = str(concept_key)
 
         # first search in cache
-        result = self.cache_by_key[concept_key] if concept_key in self.cache_by_key else \
-            self.sdp.get_safe(self.CONCEPTS_ENTRY, concept_key)
+        if concept_key in self.cache_by_key:
+            result = self.cache_by_key[concept_key]
+        else:
+            result = self.sdp.get_safe(self.CONCEPTS_ENTRY, concept_key)
+            if result is None:
+                metadata = [("key", concept_key), ("id", concept_id)] if concept_id else ("key", concept_key)
+                result = self._get_unknown(metadata)
 
-        if result and (concept_id is None or not isinstance(result, list)):
+            self.cache_by_key[concept_key] = result
+            for r in (result if isinstance(result, list) else [result]):
+                if r.id:
+                    self.cache_by_id[r.id] = r
+
+        if not (isinstance(result, list) and concept_id):
             return result
 
-        if isinstance(result, list):
-            if concept_id:
-                for c in result:
-                    if c.id == concept_id:
-                        return c
-            else:
-                return result
+        # result is a list, but we have the concept_id to discriminate
+        for c in result:
+            if c.id == concept_id:
+                return c
 
         metadata = [("key", concept_key), ("id", concept_id)] if concept_id else ("key", concept_key)
         return self._get_unknown(metadata)
@@ -386,10 +394,15 @@ class Sheerka(Concept):
             return ErrorConcept("Concept id is undefined.")
 
         # first search in cache
-        result = self.cache_by_id[concept_id] if concept_id in self.cache_by_id else \
-            self.sdp.get_safe(self.CONCEPTS_BY_ID_ENTRY, concept_id)
+        if concept_id in self.cache_by_id:
+            result = self.cache_by_id[concept_id]
+        else:
+            result = self.sdp.get_safe(self.CONCEPTS_BY_ID_ENTRY, concept_id)
+            if result is None:
+                result = self._get_unknown(('id', concept_id))
+            self.cache_by_id[concept_id] = result
 
-        return result or self._get_unknown(('id', concept_id))
+        return result
 
     def get_concepts_definitions(self, context):
         if self.concepts_definitions_cache:

src/evaluators/AddConceptEvaluator.py

@@ -6,8 +6,8 @@ from evaluators.BaseEvaluator import OneReturnValueEvaluator
 from parsers.BaseParser import NotInitializedNode
 from parsers.ConceptLexerParser import ParsingExpression, ParsingExpressionVisitor
 from parsers.DefaultParser import DefConceptNode
-
 from parsers.PythonParser import PythonNode
+import core.utils
 
 
 class ConceptOrRuleNameVisitor(ParsingExpressionVisitor):
@@ -66,7 +66,7 @@ class AddConceptEvaluator(OneReturnValueEvaluator):
             setattr(concept.metadata, prop, source)
 
             # try to find what can be a property
-            concept_name = [part.value for part in def_concept_node.name.tokens]
+            concept_name = [part.value for part in core.utils.strip_tokens(def_concept_node.name.tokens, True)]
             for p in self.get_props(sheerka, part_ret_val, concept_name):
                 props_found.add(p)
 
@@ -108,11 +108,12 @@ class AddConceptEvaluator(OneReturnValueEvaluator):
         # Case of python code
         #
         if isinstance(ret_value.value, ParserResultConcept) and isinstance(ret_value.value.value, PythonNode):
-            python_node = ret_value.value.value
-            as_concept_node = python_to_concept(python_node.ast_)
-            variables = get_names(sheerka, as_concept_node)
-            variables = filter(lambda x: x in concept_name, variables)
-            return list(variables)
+            if len(concept_name) > 1:
+                python_node = ret_value.value.value
+                as_concept_node = python_to_concept(python_node.ast_)
+                variables = get_names(sheerka, as_concept_node)
+                variables = filter(lambda x: x in concept_name, variables)
+                return list(variables)
 
         #
         # case of concept

tests/BaseTest.py

@@ -48,7 +48,7 @@ class BaseTest:
 
     @staticmethod
     def pretval(concept, source=None, parser="parsers.name"):
-        """ParserResult ret_val"""
+        """ParserResult ret_val (p stands for ParserResult)"""
         return ReturnValueConcept(
             "some_name",
             True,

tests/core/test_SheerkaCreateNewConcept.py

@@ -1,5 +1,5 @@
 from core.builtin_concepts import BuiltinConcepts
-from core.concept import PROPERTIES_TO_SERIALIZE
+from core.concept import PROPERTIES_TO_SERIALIZE, Concept
 from sdp.sheerkaDataProvider import SheerkaDataProvider
 
 from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
@@ -80,12 +80,10 @@ class TestSheerkaCreateNewConcept(TestUsingMemoryBasedSheerka):
         sheerka.cache_by_key = {}  # reset the cache
         loaded = sheerka.get(concept.key)
 
-        assert loaded is not None
         assert loaded == concept
 
         # I can also get it by its id
         loaded = sheerka.sdp.get(sheerka.CONCEPTS_BY_ID_ENTRY, concept.id)
-        assert loaded is not None
         assert loaded == concept
 
     def test_i_can_get_a_concept_by_its_id(self):
@@ -96,7 +94,6 @@ class TestSheerkaCreateNewConcept(TestUsingMemoryBasedSheerka):
         sheerka.cache_by_key = {}  # reset the cache
         loaded = sheerka.get_by_id(concept.id)
 
-        assert loaded is not None
         assert loaded == concept
 
     def test_i_can_get_list_of_concept_when_same_key_when_no_cache(self):
@@ -178,3 +175,12 @@ class TestSheerkaCreateNewConcept(TestUsingMemoryBasedSheerka):
 
         result = sheerka.get(concept1.key, "wrong id")
         assert sheerka.isinstance(result, BuiltinConcepts.UNKNOWN_CONCEPT)
+
+    def test_concept_that_references_itself_is_correctly_created(self):
+        sheerka = self.get_sheerka()
+        concept = Concept("foo", body="foo")
+
+        res = sheerka.create_new_concept(self.get_context(sheerka), concept)
+
+        assert res.status
+

tests/core/test_SheerkaEvaluateConcept.py

@@ -1,6 +1,6 @@
 import pytest
 from core.builtin_concepts import BuiltinConcepts, ReturnValueConcept, ParserResultConcept
-from core.concept import Concept, simplec, DoNotResolve, ConceptParts, Property
+from core.concept import Concept, simplec, DoNotResolve, ConceptParts, Property, InfiniteRecursionResolved
 from parsers.PythonParser import PythonNode
 
 from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
@@ -369,3 +369,91 @@ class TestSheerkaEvaluateConcept(TestUsingMemoryBasedSheerka):
         evaluated = sheerka.evaluate_concept(self.get_context(sheerka), concept)
         assert sheerka.isinstance(evaluated, BuiltinConcepts.WHERE_CLAUSE_FAILED)
         assert evaluated.body == concept
+
+    def test_i_can_detect_infinite_recursion_with_numeric_constant(self):
+        sheerka = self.get_sheerka()
+
+        one_str = Concept("one", body="1")
+        one_digit = Concept("1", body="one")
+
+        sheerka.add_in_cache(one_str)
+        sheerka.add_in_cache(one_digit)
+
+        evaluated = sheerka.evaluate_concept(self.get_context(sheerka), one_digit)
+        assert evaluated.key == one_digit.key
+        assert evaluated.body == InfiniteRecursionResolved(1)
+
+        evaluated = sheerka.evaluate_concept(self.get_context(sheerka), one_str)
+        assert evaluated.key == one_str.key
+        assert evaluated.body == InfiniteRecursionResolved(1)
+
+    def test_i_can_detect_infinite_recursion_with_boolean_constant(self):
+        sheerka = self.get_sheerka()
+
+        true_str = Concept("true", body="True")
+        true_bool = Concept("True", body="true")
+
+        sheerka.add_in_cache(true_str)
+        sheerka.add_in_cache(true_bool)
+
+        evaluated = sheerka.evaluate_concept(self.get_context(sheerka), true_str)
+        assert evaluated.key == true_str.key
+        assert evaluated.body == InfiniteRecursionResolved(True)
+
+        evaluated = sheerka.evaluate_concept(self.get_context(sheerka), true_bool)
+        assert evaluated.key == true_bool.key
+        assert evaluated.body == InfiniteRecursionResolved(True)
+
+    def test_i_can_detect_infinite_recursion_with_constant_with_more_concepts(self):
+        sheerka = self.get_sheerka()
+
+        c1 = sheerka.add_in_cache(Concept("one", body="1"))
+        c2 = sheerka.add_in_cache(Concept("1", body="2"))
+        c3 = sheerka.add_in_cache(Concept("2", body="3"))
+        c4 = sheerka.add_in_cache(Concept("3", body="one"))
+
+        for concept in (c1, c2, c3, c4):
+            evaluated = sheerka.evaluate_concept(self.get_context(sheerka), concept)
+            assert evaluated.key == concept.key
+            assert evaluated.body == InfiniteRecursionResolved(3)
+
+    def test_i_can_detect_infinite_recursion_when_no_constant(self):
+        sheerka = self.get_sheerka()
+
+        foo = sheerka.add_in_cache(Concept("foo", body="bar"))
+        bar = sheerka.add_in_cache(Concept("bar", body="baz"))
+        baz = sheerka.add_in_cache(Concept("baz", body="qux"))
+        qux = sheerka.add_in_cache(Concept("qux", body="foo"))
+
+        evaluated = sheerka.evaluate_concept(self.get_context(sheerka), foo)
+        assert sheerka.isinstance(evaluated, BuiltinConcepts.CHICKEN_AND_EGG)
+        assert evaluated.body == {foo, bar, baz, qux}
+
+        evaluated = sheerka.evaluate_concept(self.get_context(sheerka), bar)
+        assert sheerka.isinstance(evaluated, BuiltinConcepts.CHICKEN_AND_EGG)
+        assert evaluated.body == {foo, bar, baz, qux}
+
+        evaluated = sheerka.evaluate_concept(self.get_context(sheerka), baz)
+        assert sheerka.isinstance(evaluated, BuiltinConcepts.CHICKEN_AND_EGG)
+        assert evaluated.body == {foo, bar, baz, qux}
+
+        evaluated = sheerka.evaluate_concept(self.get_context(sheerka), qux)
+        assert sheerka.isinstance(evaluated, BuiltinConcepts.CHICKEN_AND_EGG)
+        assert evaluated.body == {foo, bar, baz, qux}
+
+    def test_i_can_detect_auto_recursion(self):
+        sheerka = self.get_sheerka()
+
+        foo = sheerka.add_in_cache(Concept("foo", body="foo"))
+
+        evaluated = sheerka.evaluate_concept(self.get_context(sheerka), foo)
+        assert sheerka.isinstance(evaluated, BuiltinConcepts.CHICKEN_AND_EGG)
+        assert evaluated.body == {foo}
+
+    def test_i_can_manage_auto_recursion_when_constant(self):
+        sheerka = self.get_sheerka()
+
+        one = Concept("1", body="1")
+        evaluated = sheerka.evaluate_concept(self.get_context(sheerka), one)
+        assert evaluated.key == one.key
+        assert evaluated.body == 1

tests/core/test_sheerka.py

@@ -242,3 +242,41 @@ class TestSheerka(TestUsingFileBasedSheerka):
         # only test a random one, it will be the same for the others
         sheerka = self.get_sheerka()
         assert not sheerka.is_success(sheerka.new(BuiltinConcepts.TOO_MANY_SUCCESS))
+
+    def test_cache_is_updated_after_get(self):
+        sheerka = self.get_sheerka()
+
+        # updated when by_key returns one element
+        sheerka.create_new_concept(self.get_context(sheerka), Concept("foo", body="1"))
+        sheerka.reset_cache()
+        sheerka.get("foo")
+        assert "foo" in sheerka.cache_by_key
+        assert "1001" in sheerka.cache_by_id
+
+        # updated when by_key returns two elements
+        sheerka.create_new_concept(self.get_context(sheerka), Concept("foo", body="2"))
+        sheerka.reset_cache()
+        sheerka.get("foo")
+        assert "foo" in sheerka.cache_by_key
+        assert "1001" in sheerka.cache_by_id
+        assert "1002" in sheerka.cache_by_id
+
+        # updated when by_id
+        sheerka.reset_cache()
+        sheerka.get_by_id("1001")
+        assert "1001" in sheerka.cache_by_id
+        assert "foo" not in sheerka.cache_by_key  # cache_by_key not updated as "1001" is not the only one
+
+    def test_i_can_get_by_key_several_times(self):
+        sheerka = self.get_sheerka()
+        sheerka.create_new_concept(self.get_context(sheerka), Concept("foo", body="1"))
+        sheerka.create_new_concept(self.get_context(sheerka), Concept("foo", body="2"))
+
+        sheerka.reset_cache()
+        sheerka.get("foo", "1001")  # only one element requested. But the cache must be updated with two elements
+
+        # let's check it
+        concepts = sheerka.get("foo")
+        assert len(concepts) == 2
+        assert concepts[0].id == "1001"
+        assert concepts[1].id == "1002"

tests/evaluators/test_AddConceptEvaluator.py

@@ -69,9 +69,8 @@ class TestAddConceptEvaluator(TestUsingMemoryBasedSheerka):
         return ReturnValueConcept(BaseParser.PREFIX + "some_name", True, ParserResultConcept(value=concept))
 
     @pytest.mark.parametrize("ret_val, expected", [
-        (
-            ReturnValueConcept(BaseParser.PREFIX + "some_name", True, ParserResultConcept(value=DefConceptNode([]))),
-            True),
+        (ReturnValueConcept(BaseParser.PREFIX + "some_name", True, ParserResultConcept(value=DefConceptNode([]))),
+         True),
         (ReturnValueConcept(BaseParser.PREFIX + "some_name", False, ParserResultConcept(value=DefConceptNode([]))),
          False),
         (ReturnValueConcept(BaseParser.PREFIX + "some_name", True, "not a ParserResultConcept"), False),
@@ -133,11 +132,17 @@ class TestAddConceptEvaluator(TestUsingMemoryBasedSheerka):
 
         assert from_db.compiled == {}  # ast is not saved in db
 
-    def test_i_can_get_props_from_python_node(self):
+    def test_i_can_get_props_from_python_node_when_long_name(self):
         ret_val = self.get_concept_part("isinstance(a, str)")
         context = self.get_context()
 
-        assert AddConceptEvaluator.get_props(context.sheerka, ret_val, ["a"]) == ["a"]
+        assert AddConceptEvaluator.get_props(context.sheerka, ret_val, ["a", "b"]) == ["a"]
+
+    def test_i_cannot_get_props_from_python_node_when_name_has_only_one_token(self):
+        ret_val = self.get_concept_part("isinstance(a, str)")
+        context = self.get_context()
+
+        assert AddConceptEvaluator.get_props(context.sheerka, ret_val, ["a"]) == []
 
     def test_i_can_get_props_from_another_concept(self):
         concept = Concept("hello").def_prop("a").def_prop("b")
@@ -153,3 +158,16 @@ class TestAddConceptEvaluator(TestUsingMemoryBasedSheerka):
         ret_val = self.get_return_value("mult (('+'|'-') add)?", parsing_expression)
 
         assert AddConceptEvaluator.get_props(self.get_context(), ret_val, []) == ["add", "mult"]
+
+    def test_concept_that_references_itself_is_correctly_created(self):
+        context = self.get_context()
+        def_concept_as_return_value = self.get_def_concept("foo", body="foo")
+
+        ret_val = AddConceptEvaluator().eval(context, def_concept_as_return_value)
+
+        assert ret_val.status
+        new_concept = ret_val.body.body
+        assert new_concept.name == 'foo'
+        assert new_concept.metadata.body == 'foo'
+        assert new_concept.props == {}
+        assert new_concept.metadata.props == []

tests/evaluators/test_ConceptEvaluator.py

@@ -103,7 +103,7 @@ class TestAddConceptEvaluator(TestUsingMemoryBasedSheerka):
         assert context.sheerka.isinstance(result.value, BuiltinConcepts.CONCEPT_EVAL_ERROR)
         assert result.value.concept == concept_plus
         assert result.value.property_name == "b"
-        assert context.sheerka.isinstance(result.value.error, BuiltinConcepts.TOO_MANY_ERRORS)
+        assert context.sheerka.isinstance(result.value.error, BuiltinConcepts.ERROR)
 
     def test_that_error_concepts_are_transformed_into_errors_only_if_the_key_is_different(self):
         context = self.get_context()

tests/non_reg/test_sheerka_non_reg.py

@@ -671,3 +671,28 @@ as:
 
         res = sheerka.evaluate_user_input("eval twenty three")
         assert len(res) > 1
+
+    def test_i_can_detect_when_only_one_evaluator_is_in_error(self):
+        sheerka = self.get_sheerka()
+
+        sheerka.evaluate_user_input("def concept 1 as one")
+        res = sheerka.evaluate_user_input("1")
+        assert len(res) == 1
+        assert not res[0].status
+        assert sheerka.isinstance(res[0].body, BuiltinConcepts.CONCEPT_EVAL_ERROR)
+
+    def test_i_can_manage_some_type_of_infinite_recursion(self):
+        sheerka = self.get_sheerka()
+
+        sheerka.evaluate_user_input("def concept one as 1")
+        sheerka.evaluate_user_input("def concept 1 as one")
+        res = sheerka.evaluate_user_input("one + 1")
+        assert len(res) == 1
+        assert res[0].status
+        assert res[0].body == 2
+
+        res = sheerka.evaluate_user_input("1 + 1")
+        assert len(res) == 1
+        assert res[0].status
+        assert res[0].body == 2
+