Refactored parsers to introduce priority

core/builtin_concepts.py

@@ -227,7 +227,10 @@ class ParserResultConcept(Concept):
         self.set_prop("try_parsed", try_parsed)  # in case of error, what was found before the error
 
     def __repr__(self):
-        return f"ParserResult({self.body})"
+        text = f"ParserResult(parser={self.props['parser'].value}"
+        source = self.props['source'].value
+        text += f", source='{source}')" if source else f", body='{self.body}')"
+        return text
 
     def __eq__(self, other):
         if not isinstance(other, ParserResultConcept):

core/sheerka.py

@@ -211,42 +211,82 @@ class Sheerka(Concept):
 
     def _call_parsers(self, execution_context, return_values, logger=None):
 
-        result = []
         # return_values must be a list
         if not isinstance(return_values, list):
             return_values = [return_values]
 
-        for return_value in return_values:
-            # make sure we only parse user input
-            if not return_value.status or not self.isinstance(return_value.body, BuiltinConcepts.USER_INPUT):
-                result.append(return_value)
-                continue
+        # first make the distinguish between what is for the parsers and what is not
+        result = []
+        to_process = []
+        for r in return_values:
+            if not r.status or not self.isinstance(r.body, BuiltinConcepts.USER_INPUT):
+                result.append(r)
+            else:
+                to_process.append(r)
 
-            to_parse = return_value.body.body  # get the underlying text
+        if not to_process:
+            return result
 
-            if self.log.isEnabledFor(logging.DEBUG):
-                debug_text = "'" + to_parse + "'" if isinstance(to_parse, str) \
-                    else "'" + BaseParser.get_text_from_tokens(to_parse) + "' as tokens"
-                execution_context.log(logger or self.log, f"Parsing {debug_text}")
+        # keep track of the originals user inputs, as they need to be removed at the end
+        user_inputs = to_process[:]
 
-            for parser in self.parsers.values():
-                p = parser(sheerka=self)
+        # group the parsers by priorities
+        instantiated_parsers = [parser(sheerka=self) for parser in self.parsers.values()]
+        grouped_parsers = {}
+        for parser in [p for p in instantiated_parsers if p.enabled]:
             if logger:
-                    p.log = logger
+                parser.log = logger
+            grouped_parsers.setdefault(parser.priority, []).append(parser)
+        sorted_priorities = sorted(grouped_parsers.keys(), reverse=True)
 
-                with execution_context.push(desc=f"Parsing using {p.name}") as sub_context:
-                    res = p.parse(sub_context, to_parse)
+        stop_processing = False
+        for priority in sorted_priorities:
+            inputs_for_this_group = to_process[:]
 
+            for parser in grouped_parsers[priority]:
+
+                return_value_success_found = False
+                for return_value in inputs_for_this_group:
+
+                    to_parse = return_value.body.body \
+                        if self.isinstance(return_value.body, BuiltinConcepts.USER_INPUT) \
+                        else return_value.body
+
+                    # if self.log.isEnabledFor(logging.DEBUG):
+                    #     debug_text = "'" + to_parse + "'" if isinstance(to_parse, str) \
+                    #         else "'" + BaseParser.get_text_from_tokens(to_parse) + "' as tokens"
+                    #     execution_context.log(logger or self.log, f"Parsing {debug_text}")
+
+                    with execution_context.push(desc=f"Parsing using {parser.name}") as sub_context:
+                        res = parser.parse(sub_context, to_parse)
+                        if res is not None:
                             if hasattr(res, "__iter__"):
                                 for r in res:
+                                    if r is None:
+                                        continue
                                     r.parents = [return_value]
                                     result.append(r)
+                                    if self.isinstance(r.body, BuiltinConcepts.PARSER_RESULT):
+                                        to_process.append(r)
+                                    if r.status:
+                                        return_value_success_found = True
+
                             else:
                                 res.parents = [return_value]
                                 result.append(res)
+                                if self.isinstance(res.body, BuiltinConcepts.PARSER_RESULT):
+                                    to_process.append(res)
+                                if res.status:
+                                    return_value_success_found = True
 
-                    sub_context.add_values(return_values=res)
+                    if return_value_success_found:
+                        stop_processing = True
+                        break  # Stop the other return_values (but not the other parsers with the same priority)
 
+            if stop_processing:
+                break  # Do not try the other priorities if a match is found
+
+        result = core.utils.remove_list_from_list(result, user_inputs)
         return result
 
     def _call_evaluators(self, execution_context, return_values, process_step, evaluation_context=None, logger=None):

core/utils.py

@@ -228,7 +228,6 @@ def escape_char(text, to_escape):
 
     return res
 
-
 def pp(items):
     if not hasattr(items, "__iter__"):
         return str(items)

docs/blog.rst

@@ -828,3 +828,66 @@ It will means that the concept is required.
 
 If the name is required, you can use :code:`"'name'"` or :code:`'"name"'`.
 It's already working. There is nothing to do for this one.
+
+2020-07-01
+**********
+
+How do we perform the parsing ?
+"""""""""""""""""""""""""""""""
+
+The basic flow of an execution is :
+
+* Parse the data -> Nodes
+* Evaluate the nodes -> Concepts
+* Display the results
+
+The theories says that there can exist as many parsers as necessary. Each one of them will
+be specialized to recognize a specific pattern. They will then send there information to
+the evaluators.
+
+As of now, I have implemented the following parsers:
+
+* EmptyStringParser
+    To recognize empty strings and react accordingly
+
+* PythonParser
+    To recognize Python source code
+
+* ExactConceptParser
+    To recognize simple form of concepts
+
+* DefaultParser (the name is not accurate)
+    To recognize builtin syntax (like 'def concept' or 'isa')
+
+* ConceptLexerParser
+    To recognize concept defined with BNF language
+
+All theses parsers are executed in the row (the order in not very important)
+
+The first observation is that there is lot of CPU waste. Most of the time (at least as of
+now, when a there is a match with one parser, the others fail). So there is no need to
+execute them.
+
+The second point is that there is now way for a parser to use the result of another.
+My idea is to have parsers that can be chained, each one of them will do the little thing
+it is capable of before leaving the rest to some more powerful parser.
+
+I don't want to bring out the big guns for every single user input. And I certainly
+don't want a massive and over complex parser that will be capable (in theory) of everything
+
+Why ?
+
+| First of all, monolithic code is bad :-)
+| Then I have to keep in mind that the process will be somehow distributed
+| And last, but not least. I don't have (and I certainly will never have) the full completion
+    of all possible parsing situation. So what I need is a plug and play system where I can add
+    and remove and chain parsers, depending of the input.
+
+So,
+
+* I'll give all parsers a priority
+* The parsers with the highest priority will be executed first
+* The parsers with the same priority will be executed at the same time (The order does matter)
+* If, for a given priority there is a match, the parser with a lower priority won't be executed
+* A parser has access to the output of the parsers of higher priorities (which were executed before it)
+

parsers/BaseParser.py

@@ -38,12 +38,15 @@ class UnexpectedTokenErrorNode(ErrorNode):
 class BaseParser:
     PREFIX = "parsers."
 
-    def __init__(self, name):
+    def __init__(self, name, priority: int, enabled=True):
         self.log = get_logger("parsers." + self.__class__.__name__)
         self.init_log = get_logger("init." + self.PREFIX + self.__class__.__name__)
         self.verbose_log = get_logger("verbose." + self.PREFIX + self.__class__.__name__)
 
         self.name = self.PREFIX + name
+        self.priority = priority
+        self.enabled = enabled
+
         self.has_error = False
         self.error_sink = []
 
@@ -55,6 +58,9 @@ class BaseParser:
     def __hash__(self):
         return hash(self.name)
 
+    def __repr__(self):
+        return self.name
+
     def parse(self, context, text):
         pass
 

parsers/BnfParser.py

@@ -13,7 +13,7 @@ class UnexpectedEndOfFileError(ErrorNode):
     pass
 
 
-class BnfParser:
+class BnfParser(BaseParser):
     """
     Parser used to transform litteral into ParsingExpression
     example :
@@ -27,10 +27,11 @@ class BnfParser:
 
     """
 
-    def __init__(self):
-        self.has_error = False
-        self.error_sink = []
-        self.name = BaseParser.PREFIX + "Bnf"
+    def __init__(self, **kwargs):
+        super().__init__("Bnf", 50, False)
+        # self.has_error = False
+        # self.error_sink = []
+        # self.name = BaseParser.PREFIX + "Bnf"
 
         self.lexer_iter = None
         self._current = None

parsers/ConceptLexerParser.py

@@ -524,7 +524,7 @@ class ConceptMatch(Match):
 
 class ConceptLexerParser(BaseParser):
     def __init__(self, **kwargs):
-        super().__init__("ConceptLexer")
+        super().__init__("ConceptLexer", 50)
         if 'grammars' in kwargs:
             self.concepts_grammars = kwargs.get("grammars")
         elif 'sheerka' in kwargs:

parsers/DefaultParser.py

@@ -108,7 +108,7 @@ class DefaultParser(BaseParser):
     """
 
     def __init__(self, **kwargs):
-        BaseParser.__init__(self, "Default")
+        BaseParser.__init__(self, "Default", 50)
         self.lexer_iter = None
         self._current = None
         self.context: ExecutionContext = None

parsers/EmptyStringParser.py

@@ -8,7 +8,7 @@ class EmptyStringParser(BaseParser):
     """
 
     def __init__(self, **kwargs):
-        BaseParser.__init__(self, "EmptyString")
+        BaseParser.__init__(self, "EmptyString", 90)
 
     def parse(self, context, text):
         sheerka = context.sheerka

parsers/ExactConceptParser.py

@@ -14,7 +14,7 @@ class ExactConceptParser(BaseParser):
     MAX_WORDS_SIZE = 10
 
     def __init__(self, **kwargs):
-        BaseParser.__init__(self, "ExactConcept")
+        BaseParser.__init__(self, "ExactConcept", 80)
 
     def parse(self, context, text):
         """

parsers/PythonParser.py

@@ -59,7 +59,7 @@ class PythonParser(BaseParser):
 
     def __init__(self, **kwargs):
 
-        BaseParser.__init__(self, "Python")
+        BaseParser.__init__(self, "Python", 50)
         self.source = kwargs.get("source", "<undef>")
 
     def parse(self, context, text):

tests/test_sheerka.py

@@ -6,9 +6,6 @@ import shutil
 from core.builtin_concepts import BuiltinConcepts, ReturnValueConcept, UserInputConcept, ConceptAlreadyInSet
 from core.concept import Concept, PROPERTIES_TO_SERIALIZE, Property
 from core.sheerka import Sheerka, ExecutionContext
-from evaluators.MutipleSameSuccessEvaluator import MultipleSameSuccessEvaluator
-from parsers.ConceptLexerParser import Sequence, ZeroOrMore, StrMatch, OrderedChoice, Optional, ConceptMatch, \
-    ConceptLexerParser
 from sdp.sheerkaDataProvider import SheerkaDataProvider, Event
 
 tests_root = path.abspath("../build/tests")

tests/test_sheerka_call_parsers.py

@@ -0,0 +1,380 @@
+from core.builtin_concepts import ReturnValueConcept, UserInputConcept, BuiltinConcepts, ParserResultConcept
+from core.sheerka import Sheerka, ExecutionContext
+from parsers.BaseParser import BaseParser
+from sdp.sheerkaDataProvider import Event
+
+
+def get_sheerka():
+    sheerka = Sheerka()
+    sheerka.initialize("mem://")
+    return sheerka
+
+
+def get_context(sheerka):
+    return ExecutionContext("test", Event(), sheerka)
+
+
+def get_ret_val(text, who="who"):
+    return ReturnValueConcept(who, True, UserInputConcept(text, "user_name"))
+
+
+class BaseTestParser(BaseParser):
+    debug_out = []
+
+    def __init__(self, name, priority, status=None, parser_result=None):
+        super().__init__(name, priority)
+        self.status = status
+        self.parser_result = parser_result
+
+    @staticmethod
+    def _get_name(name):
+        return name[8:] if name.startswith("parsers.") else name
+
+    @staticmethod
+    def _get_source(text_):
+        return text_ if isinstance(text_, str) else text_.body
+
+    def _out(self, name, priority, status, source):
+        debug = f"name={name}"
+        debug += f", priority={priority}"
+        debug += f", status={status}"
+        debug += f", source={source}"
+        self.debug_out.append(debug)
+
+    def parse(self, context, text):
+        self._out(self._get_name(self.name), self.priority, self.status, self._get_source(text))
+        value = self._get_name(self.name) + ":" + (text if isinstance(text, str) else text.body)
+        parser_result = ParserResultConcept(parser=self, value=value)
+        return ReturnValueConcept(self, self.status, self.parser_result or parser_result)
+
+
+class Enabled90FalseParser(BaseTestParser):
+    def __init__(self, **kwargs):
+        super().__init__("Enabled90False", 90, False)
+
+
+class Enabled80FalseParser(BaseTestParser):
+    def __init__(self, **kwargs):
+        super().__init__("Enabled80False", 80, False)
+
+
+class Enabled80MultipleFalseParser(BaseTestParser):
+    def __init__(self, **kwargs):
+        super().__init__("Enabled80MultipleFalse", 80, False)
+
+    def parse(self, context, text):
+        self._out(self._get_name(self.name), self.priority, self.status, self._get_source(text))
+        value1 = self._get_name(self.name) + ":" + (text if isinstance(text, str) else text.body) + "_1"
+        value2 = self._get_name(self.name) + ":" + (text if isinstance(text, str) else text.body) + "_2"
+        return [
+            ReturnValueConcept(self, self.status, ParserResultConcept(parser=self, value=value1)),
+            ReturnValueConcept(self, self.status, ParserResultConcept(parser=self, value=value2)),
+        ]
+
+
+class Enabled80MultipleTrueParser(BaseTestParser):
+    def __init__(self, **kwargs):
+        super().__init__("Enabled80MultipleTrue", 80)
+
+    def parse(self, context, text):
+        self._out(self._get_name(self.name), self.priority, self.status, self._get_source(text))
+        value1 = self._get_name(self.name) + ":" + (text if isinstance(text, str) else text.body) + "_1"
+        value2 = self._get_name(self.name) + ":" + (text if isinstance(text, str) else text.body) + "_2"
+        return [
+            ReturnValueConcept(self, True, ParserResultConcept(parser=self, value=value1)),
+            ReturnValueConcept(self, False, ParserResultConcept(parser=self, value=value2)),
+        ]
+
+
+class Enabled70FalseParser(BaseTestParser):
+    def __init__(self, **kwargs):
+        super().__init__("Enabled70False", 70, False, "Not a ParserResult")
+
+
+class Enabled50TrueParser(BaseTestParser):
+    def __init__(self, **kwargs):
+        super().__init__("Enabled50True", 50, True)
+
+    def parse(self, context, text):
+        source = self._get_source(text)
+        status = isinstance(text, ParserResultConcept) and source == "Enabled80False:Enabled90False:hello world"
+        self._out(self._get_name(self.name), self.priority, status, source)
+
+        value = self._get_name(self.name) + ":" + (text if isinstance(text, str) else text.body)
+        return_value = ParserResultConcept(parser=self, value=value)
+        return ReturnValueConcept(self, status, return_value)
+
+
+class Enabled50bisTrueParser(BaseTestParser):
+    def __init__(self, **kwargs):
+        super().__init__("Enabled50BisTrue", 50, True)
+
+
+class Enabled50FalseParser(BaseTestParser):
+    def __init__(self, **kwargs):
+        super().__init__("Enabled50False", 50, False)
+
+
+class Enabled10TrueParser(BaseTestParser):
+    def __init__(self, **kwargs):
+        super().__init__("Enabled10True", 10, True)
+
+
+class DisabledParser(BaseTestParser):
+    def __init__(self, **kwargs):
+        super().__init__("Disabled", 90, True)
+        self.enabled = False
+
+
+class NoneParser(BaseTestParser):
+    def __init__(self, **kwargs):
+        super().__init__("None", 90, True, None)
+
+    def parse(self, context, text):
+        self._out(self._get_name(self.name), self.priority, self.status, self._get_source(text))
+        return None
+
+
+class ListOfNoneParser(BaseTestParser):
+    def __init__(self, **kwargs):
+        super().__init__("ListOfNone", 90, True, None)
+
+    def parse(self, context, text):
+        self._out(self._get_name(self.name), self.priority, self.status, self._get_source(text))
+        return [None, None]
+
+
+def test_disabled_parsers_are_not_executed():
+    sheerka = get_sheerka()
+    sheerka.parsers = {
+        "Enabled": Enabled10TrueParser,
+        "Disabled": DisabledParser
+    }
+
+    user_input = [get_ret_val("hello world")]
+    BaseTestParser.debug_out = []
+    sheerka.execute(get_context(sheerka), user_input, [BuiltinConcepts.PARSING])
+
+    assert BaseTestParser.debug_out == ['name=Enabled10True, priority=10, status=True, source=hello world']
+
+
+def test_parser_are_executed_by_priority():
+    sheerka = get_sheerka()
+    sheerka.parsers = {
+        "Enabled90False": Enabled90FalseParser,
+        "Enabled80False": Enabled80FalseParser,
+        "Enabled50True": Enabled50TrueParser,
+    }
+
+    user_input = [get_ret_val("hello world")]
+    BaseTestParser.debug_out = []
+    sheerka.execute(get_context(sheerka), user_input, [BuiltinConcepts.PARSING])
+
+    assert BaseTestParser.debug_out == [
+        'name=Enabled90False, priority=90, status=False, source=hello world',
+        'name=Enabled80False, priority=80, status=False, source=hello world',
+        'name=Enabled80False, priority=80, status=False, source=Enabled90False:hello world',
+        'name=Enabled50True, priority=50, status=False, source=hello world',
+        'name=Enabled50True, priority=50, status=False, source=Enabled90False:hello world',
+        'name=Enabled50True, priority=50, status=False, source=Enabled80False:hello world',
+        'name=Enabled50True, priority=50, status=True, source=Enabled80False:Enabled90False:hello world',
+    ]
+
+
+def test_parsing_stop_at_the_first_success():
+    sheerka = get_sheerka()
+    sheerka.parsers = {
+        "Enabled80False": Enabled80FalseParser,
+        "Enabled50bisTrue": Enabled50bisTrueParser,
+        "Enabled10True": Enabled10TrueParser,
+    }
+
+    user_input = [get_ret_val("hello world")]
+    BaseTestParser.debug_out = []
+    sheerka.execute(get_context(sheerka), user_input, [BuiltinConcepts.PARSING])
+
+    assert BaseTestParser.debug_out == [
+        'name=Enabled80False, priority=80, status=False, source=hello world',
+        'name=Enabled50BisTrue, priority=50, status=True, source=hello world',
+    ]
+
+
+def test_parsing_stop_at_the_first_success_2():
+    """
+    Same test than before, but Enabled50True takes more time to find a match
+    :return:
+    """
+    sheerka = get_sheerka()
+    sheerka.parsers = {
+        "Enabled90False": Enabled90FalseParser,
+        "Enabled80False": Enabled80FalseParser,
+        "Enabled50True": Enabled50TrueParser,
+        "Enabled10True": Enabled10TrueParser,
+    }
+
+    user_input = [get_ret_val("hello world")]
+    BaseTestParser.debug_out = []
+    sheerka.execute(get_context(sheerka), user_input, [BuiltinConcepts.PARSING])
+
+    assert BaseTestParser.debug_out == [
+        'name=Enabled90False, priority=90, status=False, source=hello world',
+        'name=Enabled80False, priority=80, status=False, source=hello world',
+        'name=Enabled80False, priority=80, status=False, source=Enabled90False:hello world',
+        'name=Enabled50True, priority=50, status=False, source=hello world',
+        'name=Enabled50True, priority=50, status=False, source=Enabled90False:hello world',
+        'name=Enabled50True, priority=50, status=False, source=Enabled80False:hello world',
+        'name=Enabled50True, priority=50, status=True, source=Enabled80False:Enabled90False:hello world',
+    ]
+
+
+def test_all_parsers_of_a_given_priority_are_executed():
+    """
+    Make sure that all parsers with priority 50 are executed
+    :return:
+    """
+    sheerka = get_sheerka()
+    sheerka.parsers = {
+        "Enabled90False": Enabled90FalseParser,
+        "Enabled80False": Enabled80FalseParser,
+        "Enabled50True": Enabled50TrueParser,
+        "Enabled50bisTrue": Enabled50bisTrueParser,
+        "Enabled50False": Enabled50FalseParser,
+        "Enabled10True": Enabled10TrueParser,
+    }
+
+    user_input = [get_ret_val("hello world")]
+    BaseTestParser.debug_out = []
+    sheerka.execute(get_context(sheerka), user_input, [BuiltinConcepts.PARSING])
+
+    assert BaseTestParser.debug_out == [
+        'name=Enabled90False, priority=90, status=False, source=hello world',
+        'name=Enabled80False, priority=80, status=False, source=hello world',
+        'name=Enabled80False, priority=80, status=False, source=Enabled90False:hello world',
+        'name=Enabled50True, priority=50, status=False, source=hello world',
+        'name=Enabled50True, priority=50, status=False, source=Enabled90False:hello world',
+        'name=Enabled50True, priority=50, status=False, source=Enabled80False:hello world',
+        'name=Enabled50True, priority=50, status=True, source=Enabled80False:Enabled90False:hello world',
+        'name=Enabled50BisTrue, priority=50, status=True, source=hello world',
+        'name=Enabled50False, priority=50, status=False, source=hello world',
+        'name=Enabled50False, priority=50, status=False, source=Enabled90False:hello world',
+        'name=Enabled50False, priority=50, status=False, source=Enabled80False:hello world',
+        'name=Enabled50False, priority=50, status=False, source=Enabled80False:Enabled90False:hello world',
+    ]
+
+
+def test_a_parser_has_access_to_the_output_of_its_predecessors():
+    sheerka = get_sheerka()
+    sheerka.parsers = {
+        "Enabled90False": Enabled90FalseParser,
+        "Enabled80False": Enabled80FalseParser,
+        "Enabled50True": Enabled50TrueParser,
+    }
+
+    user_input = [get_ret_val("hello world")]
+
+    res = sheerka.execute(get_context(sheerka), user_input, [BuiltinConcepts.PARSING])
+    res_as_tuple = [(str(r.who)[8:], r.status, r.body.body) for r in res]
+    assert res_as_tuple == [
+        ('Enabled90False', False, 'Enabled90False:hello world'),
+        ('Enabled80False', False, 'Enabled80False:hello world'),
+        ('Enabled80False', False, 'Enabled80False:Enabled90False:hello world'),
+        ('Enabled50True', False, 'Enabled50True:hello world'),
+        ('Enabled50True', False, 'Enabled50True:Enabled90False:hello world'),
+        ('Enabled50True', False, 'Enabled50True:Enabled80False:hello world'),
+        ('Enabled50True', True, 'Enabled50True:Enabled80False:Enabled90False:hello world'),
+    ]
+
+
+def test_none_return_values_are_discarded():
+    sheerka = get_sheerka()
+    sheerka.parsers = {
+        "NoneParser": NoneParser,
+        "ListOfNone": ListOfNoneParser,
+    }
+
+    user_input = [get_ret_val("hello world")]
+
+    BaseTestParser.debug_out = []
+    res = sheerka.execute(get_context(sheerka), user_input, [BuiltinConcepts.PARSING])
+    assert res == []
+    assert BaseTestParser.debug_out == [
+        'name=None, priority=90, status=True, source=hello world',
+        'name=ListOfNone, priority=90, status=True, source=hello world'
+    ]
+
+
+def test_following_priorities_can_only_see_parser_result_return_values():
+    """
+    Normally, lower priority parsers can see the result of the higher priority parsers
+    This is true only if the higher priority parser return a ParserResultConcept
+    :return:
+    """
+
+    sheerka = get_sheerka()
+    sheerka.parsers = {
+        "Enabled80False": Enabled80FalseParser,
+        "Enabled70False": Enabled70FalseParser,
+        "Enabled50True": Enabled50TrueParser,
+    }
+
+    user_input = [get_ret_val("hello world")]
+    BaseTestParser.debug_out = []
+    sheerka.execute(get_context(sheerka), user_input, [BuiltinConcepts.PARSING])
+
+    assert BaseTestParser.debug_out == [
+        'name=Enabled80False, priority=80, status=False, source=hello world',
+        'name=Enabled70False, priority=70, status=False, source=hello world',
+        'name=Enabled70False, priority=70, status=False, source=Enabled80False:hello world',
+        'name=Enabled50True, priority=50, status=False, source=hello world',
+        'name=Enabled50True, priority=50, status=False, source=Enabled80False:hello world',
+    ]
+
+
+def test_i_can_manage_parser_with_multiple_results():
+    sheerka = get_sheerka()
+    sheerka.parsers = {
+        "Enabled80MultipleFalse": Enabled80MultipleFalseParser,
+        "Enabled50True": Enabled50TrueParser,
+    }
+
+    user_input = [get_ret_val("hello world")]
+    BaseTestParser.debug_out = []
+    res = sheerka.execute(get_context(sheerka), user_input, [BuiltinConcepts.PARSING])
+
+    assert BaseTestParser.debug_out == [
+        'name=Enabled80MultipleFalse, priority=80, status=False, source=hello world',
+        'name=Enabled50True, priority=50, status=False, source=hello world',
+        'name=Enabled50True, priority=50, status=False, source=Enabled80MultipleFalse:hello world_1',
+        'name=Enabled50True, priority=50, status=False, source=Enabled80MultipleFalse:hello world_2',
+    ]
+
+    res_as_tuple = [(str(r.who)[8:], r.status, r.body.body) for r in res]
+    assert res_as_tuple == [
+        ('Enabled80MultipleFalse', False, 'Enabled80MultipleFalse:hello world_1'),
+        ('Enabled80MultipleFalse', False, 'Enabled80MultipleFalse:hello world_2'),
+        ('Enabled50True', False, 'Enabled50True:hello world'),
+        ('Enabled50True', False, 'Enabled50True:Enabled80MultipleFalse:hello world_1'),
+        ('Enabled50True', False, 'Enabled50True:Enabled80MultipleFalse:hello world_2'),
+    ]
+
+
+def test_i_can_manage_parser_with_multiple_results_and_a_sucess():
+    sheerka = get_sheerka()
+    sheerka.parsers = {
+        "Enabled80MultipleTrue": Enabled80MultipleTrueParser,
+        "Enabled50True": Enabled50TrueParser,
+    }
+
+    user_input = [get_ret_val("hello world")]
+    BaseTestParser.debug_out = []
+    res = sheerka.execute(get_context(sheerka), user_input, [BuiltinConcepts.PARSING])
+
+    assert BaseTestParser.debug_out == [
+        'name=Enabled80MultipleTrue, priority=80, status=None, source=hello world',
+    ]
+
+    res_as_tuple = [(str(r.who)[8:], r.status, r.body.body) for r in res]
+    assert res_as_tuple == [
+        ('Enabled80MultipleTrue', True, 'Enabled80MultipleTrue:hello world_1'),
+        ('Enabled80MultipleTrue', False, 'Enabled80MultipleTrue:hello world_2'),
+    ]