I can define and eval BNF definitions

parsers/DefaultParser.py

@@ -2,12 +2,12 @@ from core.builtin_concepts import BuiltinConcepts, ReturnValueConcept, ParserRes
 from core.concept import ConceptParts
 import core.builtin_helpers
 import core.utils
-from parsers.BaseParser import BaseParser, Node, NopNode, ErrorNode, NotInitializedNode
+from parsers.BaseParser import BaseParser, Node, ErrorNode, NotInitializedNode
 from core.tokenizer import Tokenizer, TokenKind, Token, Keywords
 from dataclasses import dataclass, field
 import logging
 
-from parsers.ConceptLexerParser import RegexParser
+from parsers.BnfParser import BnfParser
 
 log = logging.getLogger(__name__)
 
@@ -206,7 +206,7 @@ class DefaultParser(BaseParser):
     Parse sheerka specific grammar (like def concept)
     """
 
-    def __init__(self):
+    def __init__(self, **kwargs):
         BaseParser.__init__(self, "DefaultParser")
         self.lexer_iter = None
         self._current = None
@@ -427,7 +427,7 @@ class DefaultParser(BaseParser):
             self.add_error(SyntaxErrorNode([definition_tokens[1]], "Empty declaration"), False)
             return NotInitializedNode()
 
-        regex_parser = RegexParser()
+        regex_parser = BnfParser()
         new_context = self.context.push(self.name)
         parsing_result = regex_parser.parse(new_context, tokens)
         if not parsing_result.status: