Fixed #68: Implement SheerkaQL

Fixed #70: SheerkaFilterManager : Pipe functions
Fixed #71: SheerkaFilterManager : filter_objects
Fixed #75: SheerkaMemory: Enhance memory() to use the filtering capabilities
Fixed #76: SheerkaEvaluateConcept: Concepts that modify the state of the system must not be evaluated during question

tests/core/test_SheerkaEvaluateConcept.py

@@ -2,7 +2,7 @@ import pytest
 
 from core.builtin_concepts import BuiltinConcepts, ReturnValueConcept, ParserResultConcept
 from core.concept import Concept, DoNotResolve, ConceptParts, InfiniteRecursionResolved, \
-    concept_part_value, DEFINITION_TYPE_DEF
+    DEFINITION_TYPE_DEF
 from core.global_symbols import NotInit, NotFound
 from core.sheerka.services.SheerkaEvaluateConcept import SheerkaEvaluateConcept
 from core.sheerka.services.SheerkaMemory import SheerkaMemory
@@ -420,7 +420,7 @@ class TestSheerkaEvaluateConcept(TestUsingMemoryBasedSheerka):
         concept = Concept("foo", body="a")
         evaluated = sheerka.evaluate_concept(context, concept)
         assert evaluated.key == concept.key
-        compare_with_test_object(evaluated.body, CB("a", "concept_a")) # this test was already done
+        compare_with_test_object(evaluated.body, CB("a", "concept_a"))  # this test was already done
 
         # so check this one.
         concept = Concept("foo", body="a").def_var("a", "'property_a'")
@@ -784,27 +784,6 @@ class TestSheerkaEvaluateConcept(TestUsingMemoryBasedSheerka):
         assert evaluated.key == command.key
         assert sheerka.get_from_memory(context, "a").obj == 10
 
-    @pytest.mark.parametrize("metadata", [
-        ConceptParts.WHERE,
-        ConceptParts.PRE,
-        ConceptParts.POST,
-        ConceptParts.RET
-    ])
-    def test_i_cannot_evaluate_python_statement_in_where_pre_post_ret(self, metadata, capsys):
-        sheerka, context, foo = self.init_concepts("foo")
-        setattr(foo.get_metadata(), concept_part_value(metadata), "a=10; print('10')")
-        foo.get_metadata().need_validation = True
-
-        evaluated = sheerka.evaluate_concept(context, foo, eval_body=True)
-        captured = capsys.readouterr()
-
-        assert sheerka.isinstance(evaluated, BuiltinConcepts.CONCEPT_EVAL_ERROR)
-        error = evaluated.body
-        assert sheerka.isinstance(error, BuiltinConcepts.PYTHON_SECURITY_ERROR)
-        assert error.prop == metadata
-        assert error.body == "a=10; print('10')"
-        assert captured.out == ""
-
     def test_python_builtin_function_are_forbidden_in_where_pre_post_ret(self, capsys):
         # I do the test only for PRE, as it will be the same for the other ConceptPart
         sheerka, context, foo, bar = self.init_concepts(