code: def expr(self, _p: int = 0):
      _parentctx = self._ctx
      _parentState = self.state
      localctx = AutolevParser.ExprContext(
          self, self._ctx, _parentState
      )
      _prevctx = localctx
      _startState = 54
      self.enterRecursionRule(localctx, 54, self.RULE_expr, _p)
      self._la = 0  # Token type
      try:
          self.enterOuterAlt(localctx, 1)
          self.state = 408
          self._errHandler.sync(self)
          la_ = self._interp.adaptivePredict(self._input, 47, self._ctx)
          if la_ == 1:
              localctx = AutolevParser.ExpContext(self, localctx)
              self._ctx = localctx
              _prevctx = localctx
  
              self.state = 367
              self.match(AutolevParser.EXP)
              pass
  
          elif la_ == 2:
              localctx = AutolevParser.NegativeOneContext(
                  self, localctx
              )
              self._ctx = localctx
              _prevctx = localctx
              self.state = 368
              self.match(AutolevParser.T__17)
              self.state = 369
              self.expr(12)
              pass
  
          elif la_ == 3:
              localctx = AutolevParser.FloatContext(self, localctx)
              self._ctx = localctx
              _prevctx = localctx
              self.state = 370
              self.match(AutolevParser.FLOAT)
              pass
  
          elif la_ == 4:
              localctx = AutolevParser.IntContext(self, localctx)
              self._ctx = localctx
              _prevctx = localctx
              self.state = 371
              self.match(AutolevParser.INT)
              pass
  
          elif la_ == 5:
              localctx = AutolevParser.IdContext(self, localctx)
              self._ctx = localctx
              _prevctx = localctx
              self.state = 372
              self.match(AutolevParser.ID)
              self.state = 376
              self._errHandler.sync(self)
              _alt = self._interp.adaptivePredict(
                  self._input, 43, self._ctx
              )
              while _alt != 2 and _alt != ATN.INVALID_ALT_NUMBER:
                  if _alt == 1:
                      self.state = 373
                      self.match(AutolevParser.T__10)
                  self.state = 378
                  self._errHandler.sync(self)
                  _alt = self._interp.adaptivePredict(
                      self._input, 43, self._ctx
                  )
  
              pass
  
          elif la_ == 6:
              localctx = AutolevParser.VectorOrDyadicContext(
                  self, localctx
              )
              self._ctx = localctx
              _prevctx = localctx
              self.state = 379
              self.vec()
              pass
  
          elif la_ == 7:
              localctx = AutolevParser.IndexingContext(self, localctx)
              self._ctx = localctx
              _prevctx = localctx
              self.state = 380
              self.match(AutolevParser.ID)
              self.state = 381
              self.match(AutolevParser.T__0)
              self.state = 382
              self.expr(0)
              self.state = 387
              self._errHandler.sync(self)
              _la = self._input.LA(1)
              while _la == 10:
                  self.state = 383
                  self.match(AutolevParser.T__9)
                  self.state = 384
                  self.expr(0)
                  self.state = 389
                  self._errHandler.sync(self)
                  _la = self._input.LA(1)
  
              self.state = 390
              self.match(AutolevParser.T__1)
              pass
  
          elif la_ == 8:
              localctx = AutolevParser.FunctionContext(self, localctx)
              self._ctx = localctx
              _prevctx = localctx
              self.state = 392
              self.functionCall()
              pass
  
          elif la_ == 9:
              localctx = AutolevParser.MatricesContext(self, localctx)
              self._ctx = localctx
              _prevctx = localctx
              self.state = 393
              self.matrix()
              pass
  
          elif la_ == 10:
              localctx = AutolevParser.ParensContext(self, localctx)
              self._ctx = localctx
              _prevctx = localctx
              self.state = 394
              self.match(AutolevParser.T__11)
              self.state = 395
              self.expr(0)
              self.state = 396
              self.match(AutolevParser.T__12)
              pass
  
          elif la_ == 11:
              localctx = AutolevParser.RangessContext(self, localctx)
              self._ctx = localctx
              _prevctx = localctx
              self.state = 399
              self._errHandler.sync(self)
              _la = self._input.LA(1)
              if _la == 48:
                  self.state = 398
                  self.match(AutolevParser.ID)
  
              self.state = 401
              self.ranges()
              self.state = 405
              self._errHandler.sync(self)
              _alt = self._interp.adaptivePredict(
                  self._input, 46, self._ctx
              )
              while _alt != 2 and _alt != ATN.INVALID_ALT_NUMBER:
                  if _alt == 1:
                      self.state = 402
                      self.match(AutolevParser.T__10)
                  self.state = 407
                  self._errHandler.sync(self)
                  _alt = self._interp.adaptivePredict(
                      self._input, 46, self._ctx
                  )
  
              pass
  
          self._ctx.stop = self._input.LT(-1)
          self.state = 427
          self._errHandler.sync(self)
          _alt = self._interp.adaptivePredict(
              self._input, 49, self._ctx
          )
          while _alt != 2 and _alt != ATN.INVALID_ALT_NUMBER:
              if _alt == 1:
                  if self._parseListeners is not None:
                      self.triggerExitRuleEvent()
                  _prevctx = localctx
                  self.state = 425
                  self._errHandler.sync(self)
                  la_ = self._interp.adaptivePredict(
                      self._input, 48, self._ctx
                  )
                  if la_ == 1:
                      localctx = AutolevParser.ExponentContext(
                          self,
                          AutolevParser.ExprContext(
                              self, _parentctx, _parentState
                          ),
                      )
                      self.pushNewRecursionContext(
                          localctx, _startState, self.RULE_expr
                      )
                      self.state = 410
                      if not self.precpred(self._ctx, 16):
                          from antlr4.error.Errors import (
                              FailedPredicateException,
                          )
  
                          raise FailedPredicateException(
                              self, "self.precpred(self._ctx, 16)"
                          )
                      self.state = 411
                      self.match(AutolevParser.T__23)
                      self.state = 412
                      self.expr(17)
                      pass
  
                  elif la_ == 2:
                      localctx = AutolevParser.MulDivContext(
                          self,
                          AutolevParser.ExprContext(
                              self, _parentctx, _parentState
                          ),
                      )
                      self.pushNewRecursionContext(
                          localctx, _startState, self.RULE_expr
                      )
                      self.state = 413
                      if not self.precpred(self._ctx, 15):
                          from antlr4.error.Errors import (
                              FailedPredicateException,
                          )
  
                          raise FailedPredicateException(
                              self, "self.precpred(self._ctx, 15)"
                          )
                      self.state = 414
                      _la = self._input.LA(1)
                      if not (_la == 25 or _la == 26):
                          self._errHandler.recoverInline(self)
                      else:
                          self._errHandler.reportMatch(self)
                          self.consume()
                      self.state = 415
                      self.expr(16)
                      pass
  
                  elif la_ == 3:
                      localctx = AutolevParser.AddSubContext(
                          self,
                          AutolevParser.ExprContext(
                              self, _parentctx, _parentState
                          ),
                      )
                      self.pushNewRecursionContext(
                          localctx, _startState, self.RULE_expr
                      )
                      self.state = 416
                      if not self.precpred(self._ctx, 14):
                          from antlr4.error.Errors import (
                              FailedPredicateException,
                          )
  
                          raise FailedPredicateException(
                              self, "self.precpred(self._ctx, 14)"
                          )
                      self.state = 417
                      _la = self._input.LA(1)
                      if not (_la == 17 or _la == 18):
                          self._errHandler.recoverInline(self)
                      else:
                          self._errHandler.reportMatch(self)
                          self.consume()
                      self.state = 418
                      self.expr(15)
                      pass
  
                  elif la_ == 4:
                      localctx = AutolevParser.IdEqualsExprContext(
                          self,
                          AutolevParser.ExprContext(
                              self, _parentctx, _parentState
                          ),
                      )
                      self.pushNewRecursionContext(
                          localctx, _startState, self.RULE_expr
                      )
                      self.state = 419
                      if not self.precpred(self._ctx, 3):
                          from antlr4.error.Errors import (
                              FailedPredicateException,
                          )
  
                          raise FailedPredicateException(
                              self, "self.precpred(self._ctx, 3)"
                          )
                      self.state = 420
                      self.match(AutolevParser.T__2)
                      self.state = 421
                      self.expr(4)
                      pass
  
                  elif la_ == 5:
                      localctx = AutolevParser.ColonContext(
                          self,
                          AutolevParser.ExprContext(
                              self, _parentctx, _parentState
                          ),
                      )
                      self.pushNewRecursionContext(
                          localctx, _startState, self.RULE_expr
                      )
                      self.state = 422
                      if not self.precpred(self._ctx, 2):
                          from antlr4.error.Errors import (
                              FailedPredicateException,
                          )
  
                          raise FailedPredicateException(
                              self, "self.precpred(self._ctx, 2)"
                          )
                      self.state = 423
                      self.match(AutolevParser.T__15)
                      self.state = 424
                      self.expr(3)
                      pass
  
              self.state = 429
              self._errHandler.sync(self)
              _alt = self._interp.adaptivePredict(
                  self._input, 49, 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 29 for calling the AutolevParser obj's underlying member method code with example usage: obj.expr(_p) and returns: localctx