Reimplemented explain feature

tests/core/test_SheerkaFilter.py

@@ -0,0 +1,213 @@
+from dataclasses import dataclass
+
+import pytest
+from core.builtin_concepts import BuiltinConcepts
+from core.sheerka.services.SheerkaFilter import Pipe, SheerkaFilter
+from printer.FormatInstructions import FormatInstructions, FormatDetailDesc, FormatDetailType
+
+from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
+
+
+@dataclass
+class Obj:
+    prop1: str
+    prop2: str
+
+
+@dataclass
+class ObjWithAsBag:
+    prop1: str
+    prop2: str
+
+    def as_bag(self):
+        return {
+            "first_prop": self.prop1,
+            "second_prop": self.prop2,
+        }
+
+
+class TestSheerkaFilter(TestUsingMemoryBasedSheerka):
+
+    def test_i_can_pipe_using_decorator(self):
+        @Pipe
+        def is_ok_with_decorator(iterable):
+            for item in iterable:
+                yield item + " ok"
+
+        def exclamation(iterable):
+            for item in iterable:
+                yield item + "!"
+
+        res = ["one", "two", "three"] | is_ok_with_decorator | Pipe(exclamation)
+        assert list(res) == ["one ok!", "two ok!", "three ok!"]
+
+    def test_i_can_pipe_function_with_context_as_first_parameter(self):
+        def func_with_context(context, iterable, var_name):
+            for item in iterable:
+                yield f"{context.desc}: {var_name}={item}"
+
+        sheerka, context = self.init_concepts()
+        context.desc = "desc"
+        pipeable = Pipe(func_with_context, context)
+
+        assert pipeable.need_context
+        assert list(["one", "two", "three"] | pipeable("var")) == ['desc: var=one', 'desc: var=two', 'desc: var=three']
+
+    def test_i_can_pipe_function_with_context_as_only_parameter(self):
+        # This time, func_with_context does not have other parameter than context and iterable
+        def func_with_context(context, iterable):
+            for item in iterable:
+                yield f"{context.desc}: var={item}"
+
+        sheerka, context = self.init_concepts()
+        context.desc = "desc"
+        pipeable = Pipe(func_with_context, context)
+
+        assert pipeable.need_context
+        assert list(["one", "two", "three"] | pipeable) == ['desc: var=one', 'desc: var=two', 'desc: var=three']
+
+    def test_i_can_pipe_explanation_concept(self):
+        sheerka, context = self.init_concepts()
+        execution_contexts = [context.push(desc=f"desc_{i}") for i in range(4)]
+        explanation_node = sheerka.new(BuiltinConcepts.EXPLANATION, body=execution_contexts)
+
+        @Pipe
+        def get_desc(iterable):
+            for item in iterable:
+                yield item.desc
+
+        res = explanation_node | get_desc
+
+        assert sheerka.isinstance(res, BuiltinConcepts.EXPLANATION)
+        assert list(res.body) == ["desc_0", "desc_1", "desc_2", "desc_3"]  # body is modified
+
+    @pytest.mark.parametrize("predicate, expected", [
+        ("True", ["one", "two", "three"]),
+        ("self == 'two'", ["two"])
+    ])
+    def test_i_can_filter(self, predicate, expected):
+        filter_service = SheerkaFilter(None)
+
+        res = ["one", "two", "three"] | Pipe(filter_service.pipe_filter)(predicate)
+
+        assert list(res) == expected
+
+    def test_i_can_filter_obj(self):
+        filter_service = SheerkaFilter(None)
+
+        lst = [Obj("a", "b"), Obj("c", "d")]
+        predicate = "prop2 == 'd'"
+        res = lst | Pipe(filter_service.pipe_filter)(predicate)
+
+        assert list(res) == [Obj("c", "d")]
+
+    def test_i_can_filter_obj_implementing_as_bag(self):
+        filter_service = SheerkaFilter(None)
+
+        lst = [ObjWithAsBag("a", "b"), ObjWithAsBag("c", "d")]
+        predicate = "second_prop == 'd'"
+        res = lst | Pipe(filter_service.pipe_filter)(predicate)
+
+        assert list(res) == [ObjWithAsBag("c", "d")]
+
+    def test_i_can_manage_name_error(self):
+        filter_service = SheerkaFilter(None)
+
+        lst = [Obj("a", "b"), Obj("c", "d"), ObjWithAsBag("a", "b"), ObjWithAsBag("c", "d")]
+        predicate = "second_prop == 'd'"  # 'second_prop' does not exist in Obj
+        res = lst | Pipe(filter_service.pipe_filter)(predicate)
+
+        assert list(res) == [ObjWithAsBag("c", "d")]
+
+    def test_i_cannot_filter_if_the_predicate_is_incorrect(self):
+        filter_service = SheerkaFilter(None)
+
+        lst = [Obj("a", "b"), Obj("c", "d")]
+        predicate = "prop2 =="
+
+        with pytest.raises(SyntaxError):
+            res = lst | Pipe(filter_service.pipe_filter)(predicate)
+            list(res)
+
+    def test_i_can_format_l(self):
+        sheerka, context, foo, bar = self.init_concepts("foo", "bar")
+        lst = [foo, bar]
+
+        res = lst | Pipe(SheerkaFilter.pipe_format_l)("my_format")
+        res = list(res)
+
+        assert len(res) == 2
+        format_instructions = res[0].get_prop(BuiltinConcepts.FORMAT_INSTRUCTIONS)
+        assert isinstance(format_instructions, FormatInstructions)
+        assert format_instructions.format_l[f"c:{foo.id}:"] == "my_format"
+
+        format_instructions = res[1].get_prop(BuiltinConcepts.FORMAT_INSTRUCTIONS)
+        assert isinstance(format_instructions, FormatInstructions)
+        assert format_instructions.format_l[f"c:{bar.id}:"] == "my_format"
+
+    def test_i_can_format_d(self):
+        sheerka, context, foo, bar = self.init_concepts("foo", "bar")
+        lst = [foo, bar]
+
+        res = lst | Pipe(SheerkaFilter.pipe_format_d)("id", "name", "body", id="%red%{id}%reset%")
+        res = list(res)
+
+        expected_props = {
+            "id": "%red%{id}%reset%",
+            "name": "{name}",
+            "body": "{body}"
+        }
+
+        assert len(res) == 2
+        format_instructions = res[0].get_prop(BuiltinConcepts.FORMAT_INSTRUCTIONS)
+        assert isinstance(format_instructions, FormatInstructions)
+        assert format_instructions.format_d[f"c:{foo.id}:"] == FormatDetailDesc(FormatDetailType.Props_In_Line, expected_props)
+
+        format_instructions = res[1].get_prop(BuiltinConcepts.FORMAT_INSTRUCTIONS)
+        assert isinstance(format_instructions, FormatInstructions)
+        assert format_instructions.format_d[f"c:{bar.id}:"] == FormatDetailDesc(FormatDetailType.Props_In_Line, expected_props)
+
+    def test_i_can_format_d_all_properties(self):
+        sheerka, context, foo, bar = self.init_concepts("foo", "bar")
+        lst = [foo, bar]
+
+        res = lst | Pipe(SheerkaFilter.pipe_format_d)()
+        res = list(res)
+
+        expected_props = {
+            'id': '{id}',
+            'name': '{name}',
+            'key': '{key}',
+            'body': '{body}',
+            'self': '{self}'
+        }
+
+        assert len(res) == 2
+        format_instructions = res[0].get_prop(BuiltinConcepts.FORMAT_INSTRUCTIONS)
+        assert isinstance(format_instructions, FormatInstructions)
+        assert format_instructions.format_d[f"c:{foo.id}:"] == FormatDetailDesc(FormatDetailType.Props_In_Line, expected_props)
+
+    def test_i_can_set_recurse(self):
+        sheerka, context, foo, bar = self.init_concepts("foo", "bar")
+        lst = [foo, bar]
+
+        res = lst | Pipe(SheerkaFilter.pipe_recurse)(10)
+        res = list(res)
+
+        assert len(res) == 2
+        format_instructions = res[0].get_prop(BuiltinConcepts.FORMAT_INSTRUCTIONS)
+        assert isinstance(format_instructions, FormatInstructions)
+        assert format_instructions.recursive_props["children"] == 10
+
+        format_instructions = res[1].get_prop(BuiltinConcepts.FORMAT_INSTRUCTIONS)
+        assert isinstance(format_instructions, FormatInstructions)
+        assert format_instructions.recursive_props["children"] == 10
+
+        res = lst | Pipe(SheerkaFilter.pipe_recurse)(15, "other_prop")
+        res = list(res)
+
+        assert len(res) == 2
+        format_instructions = res[0].get_prop(BuiltinConcepts.FORMAT_INSTRUCTIONS)
+        assert isinstance(format_instructions, FormatInstructions)
+        assert format_instructions.recursive_props["children"] == 10
+        assert format_instructions.recursive_props["other_prop"] == 15

tests/core/test_sheerkaResultManager.py

@@ -0,0 +1,147 @@
+import types
+
+from core.builtin_concepts import BuiltinConcepts
+from core.sheerka.services.SheerkaResultManager import SheerkaResultConcept
+from sdp.sheerkaDataProvider import Event
+
+from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
+
+
+class TestSheerkaResultManager(TestUsingMemoryBasedSheerka):
+
+    @classmethod
+    def setup_class(cls):
+        sheerka = cls().get_sheerka()
+        sheerka.save_execution_context = True
+
+    @classmethod
+    def teardown_class(cls):
+        sheerka = cls().get_sheerka()
+        sheerka.save_execution_context = False
+
+    def test_i_can_get_the_result_by_digest(self):
+        sheerka, context = self.init_concepts()
+
+        sheerka.evaluate_user_input("def concept one as 1")
+        digest = sheerka.get_last_execution().event.get_digest()
+
+        res = sheerka.get_results_by_digest(context, digest)
+
+        assert sheerka.isinstance(res, BuiltinConcepts.EXPLANATION)
+        assert res.command == "def concept one as 1"
+        assert res.digest == digest
+        assert isinstance(res.body, types.GeneratorType)
+
+        assert sheerka.load(SheerkaResultConcept.NAME, "digest") == digest
+
+        previous_results = list(res.body)
+
+        # Second test,
+        # I can get the result from the recorded digest
+        res = sheerka.get_results(context)
+        assert sheerka.isinstance(res, BuiltinConcepts.EXPLANATION)
+        assert res.command == "def concept one as 1"
+        assert res.digest == digest
+        assert isinstance(res.body, types.GeneratorType)
+
+        assert list(res.body) == previous_results
+
+    def test_i_cannot_get_result_by_digest_if_the_digest_does_not_exist(self):
+        sheerka, context = self.init_concepts()
+
+        res = sheerka.get_results_by_digest(context, "fake digest")
+        assert sheerka.isinstance(res, BuiltinConcepts.NOT_FOUND)
+        assert res.body == {'digest': 'fake digest'}
+
+    def test_i_cannot_get_results_if_no_previous_digest(self):
+        sheerka, context = self.init_concepts()
+        assert sheerka.get_results(context) is None
+
+    def test_i_can_get_the_result_by_command_name(self):
+        sheerka, context = self.init_concepts()
+
+        sheerka.evaluate_user_input("def concept one as 1")
+        digest = sheerka.get_last_execution().event.get_digest()
+
+        sheerka.evaluate_user_input("one")  # another command
+
+        res = sheerka.get_results_by_command(context, "def concept")
+        assert sheerka.isinstance(res, BuiltinConcepts.EXPLANATION)
+        assert res.command == "def concept one as 1"
+        assert res.digest == digest
+        assert isinstance(res.body, types.GeneratorType)
+
+    def test_i_can_get_the_result_by_command_when_not_in_the_same_page_size(self):
+        sheerka, context = self.init_concepts()
+
+        sheerka.evaluate_user_input("def concept one as 1")
+        sheerka.evaluate_user_input("one")
+        sheerka.evaluate_user_input("one")
+        sheerka.evaluate_user_input("one")
+
+        service = SheerkaResultConcept(sheerka, 2)
+        res = service.get_results_by_command(context, "def concept")
+        assert sheerka.isinstance(res, BuiltinConcepts.EXPLANATION)
+        assert res.command == "def concept one as 1"
+
+    def test_i_cannot_get_results_from_command_if_the_command_does_not_exist(self):
+        sheerka, context = self.init_concepts()
+
+        res = sheerka.get_results_by_command(context, "def concept")
+        assert sheerka.isinstance(res, BuiltinConcepts.NOT_FOUND)
+        assert res.body == {'command': 'def concept'}
+
+    def test_i_cannot_get_result_from_command_if_the_command_does_not_exists_multiple_pages(self):
+        sheerka, context = self.init_concepts()
+
+        sheerka.evaluate_user_input("def concept one as 1")
+        sheerka.evaluate_user_input("one")
+        sheerka.evaluate_user_input("one")
+        sheerka.evaluate_user_input("one")
+
+        service = SheerkaResultConcept(sheerka, 2)
+        res = service.get_results_by_command(context, "fake command")
+        assert sheerka.isinstance(res, BuiltinConcepts.NOT_FOUND)
+        assert res.body == {'command': 'fake command'}
+
+    def test_i_can_get_last_results(self):
+        sheerka, context = self.init_concepts()
+
+        sheerka.evaluate_user_input("def concept one as 1")
+        sheerka.evaluate_user_input("one")
+
+        res = sheerka.get_last_results(context)
+        assert sheerka.isinstance(res, BuiltinConcepts.EXPLANATION)
+        assert res.command == "one"
+
+    def test_i_can_get_last_results_when_event_with_no_result(self):
+        sheerka, context = self.init_concepts()
+
+        sheerka.sdp.save_event(Event("event 1"))
+        sheerka.sdp.save_event(Event("event 2"))
+        sheerka.sdp.save_event(Event("event 3"))
+        sheerka.evaluate_user_input("def concept one as 1")
+
+        res = sheerka.get_last_results(context)
+        assert sheerka.isinstance(res, BuiltinConcepts.EXPLANATION)
+        assert res.command == "def concept one as 1"
+
+    def test_i_cannot_get_last_results_when_no_result(self):
+        sheerka, context = self.init_concepts()
+
+        res = sheerka.get_last_results(context)
+        assert sheerka.isinstance(res, BuiltinConcepts.NOT_FOUND)
+        assert res.body == {'query': 'last'}
+
+    def test_i_cannot_get_last_results_when_only_events(self):
+        sheerka, context = self.init_concepts()
+
+        sheerka.sdp.save_event(Event("event 1"))
+        sheerka.sdp.save_event(Event("event 2"))
+        sheerka.sdp.save_event(Event("event 3"))
+
+        res = sheerka.get_last_results(context)
+        assert sheerka.isinstance(res, BuiltinConcepts.NOT_FOUND)
+        assert res.body == {'query': 'last'}
+
+

tests/core/test_sheerka_printer.py

@@ -3,7 +3,8 @@ from dataclasses import dataclass
 import pytest
 from core.builtin_concepts import BuiltinConcepts
 from core.concept import Concept, ConceptParts
-from parsers.ExpressionParser import TrueNode, LambdaNode
+from core.sheerka.services.SheerkaFilter import Pipe, SheerkaFilter
+from printer.Formatter import Formatter, BraceToken
 from printer.SheerkaPrinter import FormatInstructions
 
 from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
@@ -149,7 +150,43 @@ class TestSheerkaPrinter(TestUsingMemoryBasedSheerka):
     (None)level33
 """
 
-    def test_i_can_format_concept(self, capsys):
+    def test_i_can_format_l_concepts_using_default_format_l_definition(self, capsys):
+        # default format_l definition
+        # for all obj of a given type
+
+        sheerka = self.get_sheerka()
+        foo = Concept("foo a b").def_var("a").def_var("b").init_key()
+        foo.set_value("a", "value a").set_value("b", "value b")
+        foo.set_value(ConceptParts.BODY, "body")
+        sheerka.set_id_if_needed(foo, False)
+
+        sheerka.printer_handler.register_format_l(foo, "DEFAULT:{id}-{name}-{key}-{body}-{a}-{b}")
+
+        sheerka.print(foo)
+        captured = capsys.readouterr()
+        assert captured.out == "DEFAULT:1001-foo a b-foo __var__0 __var__1-body-value a-value b\n"
+
+    def test_i_can_format_l_concepts_using_context_format_l_definition(self, capsys):
+        # context format_l definition
+        # for all obj of a given type in the current print call
+
+        sheerka = self.get_sheerka()
+        foo = Concept("foo a b").def_var("a").def_var("b").init_key()
+        foo.set_value("a", "value a").set_value("b", "value b")
+        foo.set_value(ConceptParts.BODY, "body")
+        sheerka.set_id_if_needed(foo, False)
+
+        sheerka.printer_handler.register_format_l(foo, "DEFAULT:{id}-{name}-{key}-{body}-{a}-{b}")
+        context_instructions = FormatInstructions().set_format_l(foo, "CONTEXT:{id}-{name}-{key}-{body}-{a}-{b}")
+
+        sheerka.print(foo, context_instructions)
+        captured = capsys.readouterr()
+        assert captured.out == "CONTEXT:1001-foo a b-foo __var__0 __var__1-body-value a-value b\n"
+
+    def test_i_can_format_l_concepts_using_item_format_l_definition(self, capsys):
+        # item format_l definition
+        # for the item only
+
         sheerka = self.get_sheerka()
         foo = Concept("foo a b").def_var("a").def_var("b").init_key()
         foo.set_value("a", "value a").set_value("b", "value b")
@@ -157,12 +194,16 @@ class TestSheerkaPrinter(TestUsingMemoryBasedSheerka):
         sheerka.set_id_if_needed(foo, False)
 
         sheerka.printer_handler.register_format_l(foo, "{id}-{name}-{key}-{body}-{a}-{b}")
+        context_instructions = FormatInstructions().set_format_l(foo, "CONTEXT:{id}-{name}-{key}-{body}-{a}-{b}")
+        item_instructions = FormatInstructions().set_format_l(foo, "ITEM:{id}-{name}-{key}-{body}-{a}-{b}")
 
-        sheerka.print(foo)
+        foo.set_prop(BuiltinConcepts.FORMAT_INSTRUCTIONS, item_instructions)
+
+        sheerka.print(foo, context_instructions)
         captured = capsys.readouterr()
-        assert captured.out == "1001-foo a b-foo __var__0 __var__1-body-value a-value b\n"
+        assert captured.out == "ITEM:1001-foo a b-foo __var__0 __var__1-body-value a-value b\n"
 
-    def test_i_can_format_object(self, capsys):
+    def test_i_can_format_l_objects(self, capsys):
         sheerka = self.get_sheerka()
         foo = Obj("value a", "value b")
 
@@ -172,6 +213,21 @@ class TestSheerkaPrinter(TestUsingMemoryBasedSheerka):
         captured = capsys.readouterr()
         assert captured.out == "value a-value b\n"
 
+    def test_i_can_format_l_execution_context(self, capsys):
+        # In this test, no format_l definition is provided
+        # The system knows how to format ExecutionContext
+        sheerka = self.get_sheerka()
+        context = self.get_context(sheerka)
+
+        execution_context = context.push("test_sheerka_printer", "Testing Execution Context Printing")
+        ret_val = sheerka.ret("test_sheerka_printer", True, sheerka.new(BuiltinConcepts.SUCCESS))
+        execution_context.add_values(return_value=ret_val)
+        ec = execution_context.as_bag()
+
+        sheerka.print(execution_context)
+        captured = capsys.readouterr()
+        assert captured.out == f"[{ec['id']:3}]  {ec['desc']} ({ec['status']})\n"
+
     def test_i_can_register_a_custom_format_by_its_name(self, capsys):
         sheerka = self.get_sheerka()
         foo = Obj("value a", "value b")
@@ -182,80 +238,196 @@ class TestSheerkaPrinter(TestUsingMemoryBasedSheerka):
         captured = capsys.readouterr()
         assert captured.out == "value a-value b\n"
 
-    def test_i_can_define_format_in_print_instruction(self, capsys):
-        sheerka = self.get_sheerka()
-        foo = Obj("value a", "value b")
+    def test_i_can_format_d_concepts_using_default_definition(self, capsys):
+        sheerka, context, foo = self.init_concepts(Concept("foo a b").def_var("a").def_var("b"))
+        foo_1 = sheerka.new(foo.key, a="value a", b="value b")
+        foo_2 = sheerka.new(foo.key, a="value c", b="value d")
+        lst = [foo_1, foo_2]
 
-        instructions = FormatInstructions().set_format_l("tests.core.test_sheerka_printer.Obj", "{a}-{b}")
-
-        sheerka.print(foo, instructions)
+        sheerka.printer_handler.register_format_d(foo, {"a": "DEFAULT:{a}", "b": "DEFAULT:{b}"})
+        sheerka.print(lst)
         captured = capsys.readouterr()
-        assert captured.out == "value a-value b\n"
+        assert captured.out == """(1001)foo a b
+a: DEFAULT:'value a'
+b: DEFAULT:'value b'
+(1001)foo a b
+a: DEFAULT:'value c'
+b: DEFAULT:'value d'
+"""
 
-    def test_format_print_instruction_override_register_format(self, capsys):
-        sheerka = self.get_sheerka()
-        foo = Obj("value a", "value b")
+    def test_i_can_format_d_concepts_using_context_definition(self, capsys):
+        sheerka, context, foo = self.init_concepts(Concept("foo a b").def_var("a").def_var("b"))
+        foo_1 = sheerka.new(foo.key, a="value a", b="value b")
+        foo_2 = sheerka.new(foo.key, a="value c", b="value d")
+        lst = [foo_1, foo_2]
 
-        sheerka.printer_handler.register_format_l("tests.core.test_sheerka_printer.Obj", "{a}-{b}")
-        instructions = FormatInstructions().set_format_l("tests.core.test_sheerka_printer.Obj", "a={a} <> b={b}")
-
-        sheerka.print(foo, instructions)
+        sheerka.printer_handler.register_format_d(foo, {"a": "DEFAULT:{a}", "b": "DEFAULT:{b}"})
+        context_instructions = FormatInstructions().set_format_d(foo, {"a": "CONTEXT:{a}", "b": "CONTEXT:{b}"})
+        sheerka.print(lst, context_instructions)
         captured = capsys.readouterr()
-        assert captured.out == "a=value a <> b=value b\n"
+        assert captured.out == """(1001)foo a b
+a: CONTEXT:'value a'
+b: CONTEXT:'value b'
+(1001)foo a b
+a: CONTEXT:'value c'
+b: CONTEXT:'value d'
+"""
 
-    def test_i_can_format_d(self, capsys):
+    def test_i_can_format_d_concepts_using_item_definition(self, capsys):
+        sheerka, context, foo = self.init_concepts(Concept("foo a b").def_var("a").def_var("b"))
+        item_instructions = FormatInstructions().set_format_d(foo, {"a": "ITEM:{a}", "b": "ITEM:{b}"})
+        foo.set_format_instructions(item_instructions)
+        foo_1 = sheerka.new(foo.key, a="value a", b="value b")
+        foo_2 = sheerka.new(foo.key, a="value c", b="value d")
+        lst = [foo_1, foo_2]
+
+        sheerka.printer_handler.register_format_d(foo, {"a": "DEFAULT:{a}", "b": "DEFAULT:{b}"})
+        context_instructions = FormatInstructions().set_format_d(foo, {"a": "CONTEXT:{a}", "b": "CONTEXT:{b}"})
+        # Note that this time, foo has a format instruction defined
+
+        sheerka.print(lst, context_instructions)
+        captured = capsys.readouterr()
+        assert captured.out == """(1001)foo a b
+a: ITEM:'value a'
+b: ITEM:'value b'
+(1001)foo a b
+a: ITEM:'value c'
+b: ITEM:'value d'
+"""
+
+    def test_i_can_format_d_objects(self, capsys):
         sheerka = self.get_sheerka()
         foo = [Obj("value a", "value b"), Obj("value c", "value d")]
 
-        sheerka.printer_handler.register_format_d(TrueNode(), ["a", "b"])
+        sheerka.printer_handler.register_format_d(Obj, {"a": "CUSTOM:{a}", "b": "CUSTOM:{b}"})
         sheerka.print(foo)
         captured = capsys.readouterr()
         assert captured.out == """Obj(a='value a', b='value b')
-a: value a
-b: value b
+a: CUSTOM:'value a'
+b: CUSTOM:'value b'
 Obj(a='value c', b='value d')
-a: value c
-b: value d
+a: CUSTOM:'value c'
+b: CUSTOM:'value d'
+"""
+
+    def test_i_can_format_d_with_only_a_list_of_properties(self, capsys):
+        sheerka = self.get_sheerka()
+        foo = [Obj("value a", "value b"), Obj("value c", "value d")]
+
+        sheerka.printer_handler.register_format_d(Obj, ["a", "b"])
+        sheerka.print(foo)
+        captured = capsys.readouterr()
+        assert captured.out == """Obj(a='value a', b='value b')
+a: 'value a'
+b: 'value b'
+Obj(a='value c', b='value d')
+a: 'value c'
+b: 'value d'
 """
 
     def test_i_can_format_d_and_align_properties(self, capsys):
         sheerka = self.get_sheerka()
         foo = [ObjLongProp("value a", "value b"), ObjLongProp("value c", "value d")]
 
-        sheerka.printer_handler.register_format_d(TrueNode(), ["first_property_name", "second"])
+        sheerka.printer_handler.register_format_d(ObjLongProp, ["first_property_name", "second"])
         sheerka.print(foo)
         captured = capsys.readouterr()
         assert captured.out == """ObjLongProp(first_property_name='value a', second='value b')
-first_property_name: value a
-second             : value b
+first_property_name: 'value a'
+second             : 'value b'
 ObjLongProp(first_property_name='value c', second='value d')
-first_property_name: value c
-second             : value d
+first_property_name: 'value c'
+second             : 'value d'
+"""
+
+    def test_i_can_format_d_all_properties_of_a_concept(self, capsys):
+        sheerka, context, foo = self.init_concepts(Concept("foo a b").def_var("a").def_var("b"))
+        foo_1 = sheerka.new(foo.key, a="value a", b="value b")
+        foo_2 = sheerka.new(foo.key, a="value c", b="value d")
+        lst = [foo_1, foo_2]
+
+        sheerka.printer_handler.register_format_d(foo)
+        sheerka.print(lst)
+        captured = capsys.readouterr()
+        assert captured.out == """(1001)foo a b
+a    : 'value a'
+var.a: *name 'var' is not defined*
+b    : 'value b'
+var.b: *name 'var' is not defined*
+id   : '1001'
+name : 'foo a b'
+key  : 'foo __var__0 __var__1'
+body : __NOT_INITIALIZED
+self : (1001)foo a b
+(1001)foo a b
+a    : 'value c'
+var.a: *name 'var' is not defined*
+b    : 'value d'
+var.b: *name 'var' is not defined*
+id   : '1001'
+name : 'foo a b'
+key  : 'foo __var__0 __var__1'
+body : __NOT_INITIALIZED
+self : (1001)foo a b
+"""
+
+    def test_i_can_format_d_when_dictionary(self, capsys):
+        sheerka, context, foo = self.init_concepts(Concept("foo a b").def_var("a").def_var("b"))
+        dict_value = {
+            "a": "value a",
+            "beta": {"b1": 10, "b2": Obj("10", 15), "b3": ["items", "in", "a", "list"]},
+            "gamma": {"list": ["'quoted string'", '"double" \'single\'', "c3"], "empty": []},
+            "epsilon": ["a", "b", "c"],
+            "g": {"tuple": ("tuple-a", "tuple-b", "tuple-b"), "empty": tuple()},
+            "h": {"set": {"set-a"}, "empty": set()},
+        }
+        foo_1 = sheerka.new(foo.key, a="value a", b=dict_value)
+        lst = [foo_1]
+
+        sheerka.printer_handler.register_format_d(foo)
+        sheerka.print(lst)
+        captured = capsys.readouterr()
+        assert captured.out == """(1001)foo a b
+a    : 'value a'
+var.a: *name 'var' is not defined*
+b    : {'a'      : 'value a'
+        'beta'   : {'b1': 10
+                    'b2': Obj(a='10', b=15)
+                    'b3': ['items',
+                           'in',
+                           'a',
+                           'list']}
+        'gamma'  : {'list' : ["'quoted string'",
+                              ""double" 'single'",
+                              'c3']
+                    'empty': []}
+        'epsilon': ['a',
+                    'b',
+                    'c']
+        'g'      : {'tuple': ('tuple-a',
+                              'tuple-b',
+                              'tuple-b')
+                    'empty': ()}
+        'h'      : {'set'  : {'set-a'}
+                    'empty': {}}}
+var.b: *name 'var' is not defined*
+id   : '1001'
+name : 'foo a b'
+key  : 'foo __var__0 __var__1'
+body : __NOT_INITIALIZED
+self : (1001)foo a b
 """
 
     def test_i_can_manage_when_property_does_not_exist(self, capsys):
         sheerka = self.get_sheerka()
         foo = Obj("value a", "value b")
 
-        sheerka.printer_handler.register_format_d(TrueNode(), ["foo", "bar"])
+        sheerka.printer_handler.register_format_d(Obj, ["foo", "bar"])
         sheerka.print(foo)
         captured = capsys.readouterr()
         assert captured.out == """Obj(a='value a', b='value b')
-foo: *Undefined*
-bar: *Undefined*
-"""
-
-    def test_i_can_select_the_object_to_format_d(self, capsys):
-        sheerka = self.get_sheerka()
-        foo = [Obj("value a", "value b"), ObjLongProp("value c", "value d")]
-
-        sheerka.printer_handler.register_format_d(LambdaNode(lambda o: isinstance(o, Obj)), ["a", "b"])
-        sheerka.print(foo)
-        captured = capsys.readouterr()
-        assert captured.out == """Obj(a='value a', b='value b')
-a: value a
-b: value b
-ObjLongProp(first_property_name='value c', second='value d')
+foo: *name 'foo' is not defined*
+bar: *name 'bar' is not defined*
 """
 
     @pytest.mark.parametrize("template, expected", [
@@ -265,7 +437,6 @@ ObjLongProp(first_property_name='value c', second='value d')
         ("{b}\\+", "value b+\n"),
         ("+", "+\n"),
         ("\\+", "\\+\n"),
-        ("+\\", "+\\\n"),
     ])
     def test_i_can_concat_print_instruction_and_register_format(self, capsys, template, expected):
         sheerka = self.get_sheerka()
@@ -277,3 +448,39 @@ ObjLongProp(first_property_name='value c', second='value d')
         sheerka.print(foo, instructions)
         captured = capsys.readouterr()
         assert captured.out == expected
+
+    def test_i_can_manage_exception_when_printing(self, capsys):
+        sheerka = self.get_sheerka()
+        filter_service = SheerkaFilter(sheerka)
+        predicate = "self='two'"  # it should be self=='two'
+        items = ["one", "two", "three"] | Pipe(filter_service.pipe_filter)(predicate)
+
+        sheerka.print(items)
+        captured = capsys.readouterr()
+        assert captured.out == "\x1b[31mSyntaxError: invalid syntax\nself='two'\n    ^\x1b[0m\n"
+
+    @pytest.mark.parametrize("template, expected", [
+        (None, []),
+        ("", []),
+        ("foo", []),
+        ("{foo}", [BraceToken(0, 4, -1)]),
+        ("xxx{foo}yyy", [BraceToken(3, 7, -1)]),
+        ("{foo}{bar}-{baz}", [BraceToken(0, 4, -1), BraceToken(5, 9, -1), BraceToken(11, 15, -1)]),
+        ("xxx{{foo}}yyy", []),
+        ("xxx{{foo}yyy", []),
+        ("xxx{yyy", []),
+        ("xxx{", []),
+    ])
+    def test_i_can_get_braces(self, template, expected):
+        assert list(Formatter.braces(template)) == expected
+
+    @pytest.mark.parametrize("template, expected", [
+        (None, None),
+        ("", ""),
+        ("foo", "foo"),
+        ("{foo}", "{format_obj(foo, 0)}"),
+        ("{foo : >16}", "{format_obj(foo , 0): >16}"),
+        ("{foo : >16}{bar}xxx{baz}", "{format_obj(foo , 0): >16}{format_obj(bar, 0)}xxx{format_obj(baz, 0)}"),
+    ])
+    def test_i_can_inject_format_obj(self, template, expected):
+        assert Formatter.inject_format_obj(template, 0) == expected