Working on #48 : Refactored FunctionParser, introducting ExpressionParser

src/core/utils.py

@@ -545,16 +545,21 @@ def decode_concept(text, wrapper="C"):
     return None, None
 
 
-def tokens_index(tokens, sub_tokens, skip=0):
+def tokens_index(tokens, sub_tokens, skip=0, start_from_end=False):
     """
     Index of the sub tokens in tokens
     :param tokens: tokens
     :param sub_tokens: sub tokens to search
     :param skip: number of found to skip
+    :param start_from_end: start by the end
     :return:
     """
     expected = [token.value for token in sub_tokens if token.type != TokenKind.EOF]
-    for i in range(0, len(tokens) - len(expected) + 1):
+    indexes = range(0, len(tokens) - len(expected) + 1)
+    if start_from_end:
+        indexes = reversed(indexes)
+
+    for i in indexes:
         for j in range(len(expected)):
             if tokens[i + j].value != expected[j]:
                 break