Implemented FunctionParser

src/parsers/ExpressionParser.py

@@ -191,23 +191,8 @@ class ExpressionParser(BaseParser):
     def __init__(self, **kwargs):
         super().__init__("Expression", 50, False)
 
-    def reset_parser(self, context, parser_input: ParserInput):
-        self.context = context
-        self.sheerka = context.sheerka
-        self.parser_input = parser_input
-        self.error_sink.clear()
-
-        try:
-            self.parser_input.reset(False)
-            self.parser_input.next_token()
-        except LexerError as e:
-            self.add_error(self.sheerka.new(BuiltinConcepts.ERROR, body=e), False)
-            return False
-        return True
-
     def parse(self, context, parser_input: ParserInput):
         """
-        parser_input can be string, but text can also be an list of tokens
         :param context:
         :param parser_input:
         :return: