Implemented a first and basic version of a Rete rule engine

tests/parsers/test_BaseCustomGrammarParser.py

@@ -1,9 +1,9 @@
 import pytest
+
 from core.sheerka.services.SheerkaExecute import ParserInput
 from core.tokenizer import Keywords, Tokenizer, TokenKind
 from parsers.BaseCustomGrammarParser import BaseCustomGrammarParser, SyntaxErrorNode, KeywordNotFound
 from parsers.BaseParser import UnexpectedEofParsingError, UnexpectedTokenParsingError
-
 from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
 
 
@@ -43,6 +43,7 @@ class TestBaseCustomGrammarParser(TestUsingMemoryBasedSheerka):
         ("when uuu vvv print xxx yyy", False, {Keywords.WHEN: "when uuu vvv ", Keywords.PRINT: "print xxx yyy"}),
         ("print xxx yyy when uuu vvv", False, {Keywords.WHEN: "when uuu vvv", Keywords.PRINT: "print xxx yyy "}),
         ("  when xxx", False, {Keywords.WHEN: "when xxx"}),
+
         ("when xxx yyy", True, {Keywords.WHEN: "when xxx yyy"}),
         ("when uuu vvv print xxx yyy", True, {Keywords.WHEN: "when uuu vvv", Keywords.PRINT: "print xxx yyy"}),
         ("print xxx yyy when uuu vvv", True, {Keywords.WHEN: "when uuu vvv", Keywords.PRINT: "print xxx yyy"}),
@@ -84,7 +85,7 @@ func(a)
 
         assert parser.get_parts(["when", "print"], Keywords.PRINT) is None
         assert parser.error_sink == [UnexpectedTokenParsingError(f"'print' keyword not found.",
-                                                              "when",
+                                                                 "when",
                                                                  [Keywords.PRINT])]
 
     def test_i_can_detect_when_a_keyword_appears_several_times(self):
@@ -214,7 +215,8 @@ print xxx"""
 
         sheerka, context, parser = self.init_parser("")
         assert parser.get_body(list(Tokenizer(text, yield_eof=False))) is None
-        assert parser.error_sink == [UnexpectedTokenParsingError("Indentation not found.", "zzz", [TokenKind.WHITESPACE])]
+        assert parser.error_sink == [
+            UnexpectedTokenParsingError("Indentation not found.", "zzz", [TokenKind.WHITESPACE])]
 
     def test_i_can_detect_invalid_indentation_when_get_body(self):
         sheerka, context, parser = self.init_parser("")