Error while creating a circuit through file

[jenila19]

Hi, I am getting the following error while creating a circuit in jupyter using circuitgraph. My file is a halfadder program
" module halfadder
(
input a,
input b,
output sum,
output carry
);

xor x1(sum, a, b) ;
and a1(carry, a, b) ;

endmodule"

##Error I got for the code "c = cg.from_file('C:/Users/jenil/Downloads/halfadder.v')"

---

UnexpectedCharacters Traceback (most recent call last)
File ~\AppData\Local\Programs\Python\Python311\Lib\site-packages\lark\lexer.py:648, in ContextualLexer.lex(self, lexer_state, parser_state)
647 lexer = self.lexers[parser_state.position]
--> 648 yield lexer.next_token(lexer_state, parser_state)
649 except EOFError:

File ~\AppData\Local\Programs\Python\Python311\Lib\site-packages\lark\lexer.py:581, in BasicLexer.next_token(self, lex_state, parser_state)
580 allowed = {""}
--> 581 raise UnexpectedCharacters(lex_state.text, line_ctr.char_pos, line_ctr.line, line_ctr.column,
582 allowed=allowed, token_history=lex_state.last_token and [lex_state.last_token],
583 state=parser_state, terminals_by_name=self.terminals_by_name)
585 value, type_ = res

UnexpectedCharacters: No terminal matches 'a' in the current parser context, at line 3 col 8

input a,
          ^

Expected one of:
* RPAR
* COMMA

Previous tokens: Token('IDENTIFIER', 'input')

During handling of the above exception, another exception occurred:

UnexpectedToken Traceback (most recent call last)
Cell In[15], line 2
1 from circuitgraph import Circuit
----> 2 c = cg.from_file('C:/Users/jenil/Downloads/halfadder.v')

File ~\AppData\Local\Programs\Python\Python311\Lib\site-packages\circuitgraph\io.py:75, in from_file(path, name, fmt, blackboxes, warnings, error_on_warning, fast)
73 netlist = f.read()
74 if fmt == "verilog" or path.suffix == ".v":
---> 75 return verilog_to_circuit(
76 netlist,
77 name,
78 infer_module_name,
79 blackboxes,
80 warnings,
81 error_on_warning,
82 fast,
83 )
84 if fmt == "bench" or path.suffix == ".bench":
85 return bench_to_circuit(netlist, name)

File ~\AppData\Local\Programs\Python\Python311\Lib\site-packages\circuitgraph\io.py:238, in verilog_to_circuit(netlist, name, infer_module_name, blackboxes, warnings, error_on_warning, fast)
235 else:
236 raise ValueError(f"Could not read netlist: {name} module not found") from e1
--> 238 return parse_verilog_netlist(module, blackboxes, warnings, error_on_warning)

File ~\AppData\Local\Programs\Python\Python311\Lib\site-packages\circuitgraph\parsing\verilog.py:374, in parse_verilog_netlist(netlist, blackboxes, warnings, error_on_warning)
372 with open(Path(file).parent.absolute() / "verilog.lark") as f:
373 parser = Lark(f, parser="lalr", transformer=transformer)
--> 374 [c] = parser.parse(netlist)
375 return c

File ~\AppData\Local\Programs\Python\Python311\Lib\site-packages\lark\lark.py:652, in Lark.parse(self, text, start, on_error)
634 def parse(self, text: str, start: Optional[str]=None, on_error: 'Optional[Callable[[UnexpectedInput], bool]]'=None) -> 'ParseTree':
635 """Parse the given text, according to the options provided.
636
637 Parameters:
(...)
650
651 """
--> 652 return self.parser.parse(text, start=start, on_error=on_error)

File ~\AppData\Local\Programs\Python\Python311\Lib\site-packages\lark\parser_frontends.py:101, in ParsingFrontend.parse(self, text, start, on_error)
99 kw = {} if on_error is None else {'on_error': on_error}
100 stream = self._make_lexer_thread(text)
--> 101 return self.parser.parse(stream, chosen_start, **kw)

File ~\AppData\Local\Programs\Python\Python311\Lib\site-packages\lark\parsers\lalr_parser.py:41, in LALR_Parser.parse(self, lexer, start, on_error)
39 def parse(self, lexer, start, on_error=None):
40 try:
---> 41 return self.parser.parse(lexer, start)
42 except UnexpectedInput as e:
43 if on_error is None:

File ~\AppData\Local\Programs\Python\Python311\Lib\site-packages\lark\parsers\lalr_parser.py:171, in _Parser.parse(self, lexer, start, value_stack, state_stack, start_interactive)
169 if start_interactive:
170 return InteractiveParser(self, parser_state, parser_state.lexer)
--> 171 return self.parse_from_state(parser_state)

File ~\AppData\Local\Programs\Python\Python311\Lib\site-packages\lark\parsers\lalr_parser.py:193, in _Parser.parse_from_state(self, state, last_token)
191 except NameError:
192 pass
--> 193 raise e
194 except Exception as e:
195 if self.debug:

File ~\AppData\Local\Programs\Python\Python311\Lib\site-packages\lark\parsers\lalr_parser.py:183, in _Parser.parse_from_state(self, state, last_token)
181 try:
182 token = last_token
--> 183 for token in state.lexer.lex(state):
184 state.feed_token(token)
186 end_token = Token.new_borrow_pos('$END', '', token) if token else Token('$END', '', 0, 1, 1)

File ~\AppData\Local\Programs\Python\Python311\Lib\site-packages\lark\lexer.py:657, in ContextualLexer.lex(self, lexer_state, parser_state)
655 last_token = lexer_state.last_token # Save last_token. Calling root_lexer.next_token will change this to the wrong token
656 token = self.root_lexer.next_token(lexer_state, parser_state)
--> 657 raise UnexpectedToken(token, e.allowed, state=parser_state, token_history=[last_token], terminals_by_name=self.root_lexer.terminals_by_name)
658 except UnexpectedCharacters:
659 raise e

UnexpectedToken: Unexpected token Token('IDENTIFIER', 'a') at line 3, column 8.
Expected one of:
* RPAR
* COMMA
Previous tokens: [Token('IDENTIFIER', 'input')]. PI give a guidance.