Fixed #48 : RelationalExpressionParser: Implement relational operator parser

Fixed #49 : ExpressionParser: Implement ExpressionParser
Fixed #50 : Implement ReteConditionExprVisitor
Fixed #51 : Implement PythonConditionExprVisitor
Fixed #52 : SheerkaConceptManager: I can get and set concept property

src/parsers/BaseNodeParser.py

@@ -1,5 +1,4 @@
 from dataclasses import dataclass
-from enum import Enum
 
 import core.utils
 from core.tokenizer import TokenKind, Token
@@ -452,15 +451,6 @@ class NoMatchingTokenError(ParsingError):
     pos: int
 
 
-class SyaAssociativity(Enum):
-    Left = "left"
-    Right = "right"
-    No = "No"
-
-    def __repr__(self):
-        return self.value
-
-
 class BaseNodeParser(BaseParserInputParser):
     """
     Parser that return LexerNode