I can now use keyword in concept definition and parsing

src/core/tokenizer.py

@@ -59,6 +59,7 @@ class Token:
     line: int
     column: int
 
+    _strip_quote: str = field(default=None, repr=False, compare=False, hash=None)
     _str_value: str = field(default=None, repr=False, compare=False, hash=None)
 
     def __repr__(self):
@@ -75,23 +76,34 @@ class Token:
 
         return f"Token({value})"
 
+    @property
+    def strip_quote(self):
+        if self._strip_quote:
+            return self._strip_quote
+
+        self._strip_quote = self._to_str(True)
+        return self._strip_quote
+
     @property
     def str_value(self):
         if self._str_value:
             return self._str_value
 
-        if self.type == TokenKind.STRING:
-            self._str_value = self.value[1:-1]
-        elif self.type == TokenKind.KEYWORD:
-            self._str_value = self.value.value
-        else:
-            self._str_value = str(self.value)
+        self._str_value = self._to_str(False)
         return self._str_value
 
     @staticmethod
     def is_whitespace(token):
         return token and token.type == TokenKind.WHITESPACE
 
+    def _to_str(self, strip_quote):
+        if strip_quote and self.type == TokenKind.STRING:
+            return self.value[1:-1]
+        elif self.type == TokenKind.KEYWORD:
+            return self.value.value
+        else:
+            return str(self.value)
+
 
 @dataclass()
 class LexerError(Exception):