code: def parse_rule(state: parse_state, src: const_char_p) -> const_char_p:
      name_end = parse_name(src)  # type: const_char_p
      pos = parse_space(name_end, False)  # type: const_char_p
      name_len = name_end - src  # type: int
      rule_id = get_symbol_id(state, src, name_len)  # type: int
      name = std.string(src, name_len)  # type: str
  
      if not (pos[0] == ":" and pos[1] == ":" and pos[2] == "="):
          raise RuntimeError("expecting ::= at " + str(pos))
  
      pos = parse_space(pos + 3, True)  # type: const_char_p
      pos = parse_alternates(
          state, pos, name, rule_id, False
      )  # type: const_char_p
  
      if pos[0] == "\r":
          pos += 2 if pos[1] == "\n" else 1
      elif pos[0] == "\n":
          pos += 1
      elif pos[0]:
          raise RuntimeError("expecting newline or end at " + str(pos))
      return parse_space(pos, True)
  
imports: from pathlib import Path
  import sys
  from ctypes import *
  from enum import Enum
  from itertools import islice
  from typing import Any, Callable, Dict, Generic, List, Optional, OrderedDict, TextIO, Tuple, TypeVar, Union, overload
  import llama_cpp.llama_cpp
  import json
  import re
  from typing import List, Optional
label_desc: Use image node_id 12 for calling a global function with example usage: parse_rule(state, src) and returns: parse_space