code: def exp_nofunc(self, _p: int = 0):
      _parentctx = self._ctx
      _parentState = self.state
      localctx = LaTeXParser.Exp_nofuncContext(
          self, self._ctx, _parentState
      )
      _prevctx = localctx
      _startState = 32
      self.enterRecursionRule(localctx, 32, self.RULE_exp_nofunc, _p)
      try:
          self.enterOuterAlt(localctx, 1)
          self.state = 217
          self.comp_nofunc()
          self._ctx.stop = self._input.LT(-1)
          self.state = 233
          self._errHandler.sync(self)
          _alt = self._interp.adaptivePredict(
              self._input, 19, self._ctx
          )
          while _alt != 2 and _alt != ATN.INVALID_ALT_NUMBER:
              if _alt == 1:
                  if self._parseListeners is not None:
                      self.triggerExitRuleEvent()
                  _prevctx = localctx
                  localctx = LaTeXParser.Exp_nofuncContext(
                      self, _parentctx, _parentState
                  )
                  self.pushNewRecursionContext(
                      localctx, _startState, self.RULE_exp_nofunc
                  )
                  self.state = 219
                  if not self.precpred(self._ctx, 2):
                      from antlr4.error.Errors import (
                          FailedPredicateException,
                      )
  
                      raise FailedPredicateException(
                          self, "self.precpred(self._ctx, 2)"
                      )
                  self.state = 220
                  self.match(LaTeXParser.CARET)
                  self.state = 226
                  self._errHandler.sync(self)
                  token = self._input.LA(1)
                  if token in [
                      27,
                      29,
                      30,
                      68,
                      69,
                      70,
                      71,
                      72,
                      76,
                      77,
                      78,
                      91,
                  ]:
                      self.state = 221
                      self.atom()
                      pass
                  elif token in [21]:
                      self.state = 222
                      self.match(LaTeXParser.L_BRACE)
                      self.state = 223
                      self.expr()
                      self.state = 224
                      self.match(LaTeXParser.R_BRACE)
                      pass
                  else:
                      raise NoViableAltException(self)
  
                  self.state = 229
                  self._errHandler.sync(self)
                  la_ = self._interp.adaptivePredict(
                      self._input, 18, self._ctx
                  )
                  if la_ == 1:
                      self.state = 228
                      self.subexpr()
  
              self.state = 235
              self._errHandler.sync(self)
              _alt = self._interp.adaptivePredict(
                  self._input, 19, self._ctx
              )
  
      except RecognitionException as re:
          localctx.exception = re
          self._errHandler.reportError(self, re)
          self._errHandler.recover(self, re)
      finally:
          self.unrollRecursionContexts(_parentctx)
      return localctx
  
imports: from antlr4 import *
  from io import StringIO
  import sys
label_desc: Use image node_id 18 for calling the LaTeXParser obj's underlying member method code with example usage: obj.exp_nofunc(_p) and returns: localctx