Fixed #49 : working

src/parsers/BaseExpressionParser.py

@@ -4,7 +4,7 @@ from typing import List, Tuple, Union
 from core.builtin_concepts_ids import BuiltinConcepts
 from core.sheerka.services.SheerkaExecute import ParserInput
 from core.tokenizer import Token, TokenKind, Tokenizer, LexerError
-from core.utils import tokens_are_matching
+from core.utils import tokens_are_matching, get_text_from_tokens
 from parsers.BaseNodeParser import UnrecognizedTokensNode
 from parsers.BaseParser import Node, ParsingError, BaseParser, ErrorSink, UnexpectedTokenParsingError
 
@@ -33,7 +33,7 @@ class ParenthesisMismatchError(ParsingError):
     token: Token
 
 
-@dataclass
+@dataclass(init=False)
 class ExprNode(Node):
     """
     Base ExprNode
@@ -43,6 +43,12 @@ class ExprNode(Node):
     end: int  # index of the last token
     tokens: List[Token]
 
+    def __init__(self, start: int, end: int, tokens: List[Token]):
+        self.start = start
+        self.end = end
+        self.tokens = tokens
+        self.source = None
+
     def eval(self, obj):
         return True
 
@@ -61,6 +67,12 @@ class ExprNode(Node):
     def __hash__(self):
         return hash((self.start, self.end))
 
+    def get_source(self):
+        if self.source is None:
+            self.source = get_text_from_tokens(self.tokens)
+
+        return self.source
+
 
 class NameExprNode(ExprNode):
     def __init__(self, start, end, tokens):