code: def additive(self, _p: int = 0):
      _parentctx = self._ctx
      _parentState = self.state
      localctx = LaTeXParser.AdditiveContext(
          self, self._ctx, _parentState
      )
      _prevctx = localctx
      _startState = 8
      self.enterRecursionRule(localctx, 8, self.RULE_additive, _p)
      self._la = 0  # Token type
      try:
          self.enterOuterAlt(localctx, 1)
          self.state = 102
          self.mp(0)
          self._ctx.stop = self._input.LT(-1)
          self.state = 109
          self._errHandler.sync(self)
          _alt = self._interp.adaptivePredict(self._input, 1, 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.AdditiveContext(
                      self, _parentctx, _parentState
                  )
                  self.pushNewRecursionContext(
                      localctx, _startState, self.RULE_additive
                  )
                  self.state = 104
                  if not self.precpred(self._ctx, 2):
                      from antlr4.error.Errors import (
                          FailedPredicateException,
                      )
  
                      raise FailedPredicateException(
                          self, "self.precpred(self._ctx, 2)"
                      )
                  self.state = 105
                  _la = self._input.LA(1)
                  if not (_la == 15 or _la == 16):
                      self._errHandler.recoverInline(self)
                  else:
                      self._errHandler.reportMatch(self)
                      self.consume()
                  self.state = 106
                  self.additive(3)
              self.state = 111
              self._errHandler.sync(self)
              _alt = self._interp.adaptivePredict(
                  self._input, 1, 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 6 for calling the LaTeXParser obj's underlying member method code with example usage: obj.additive(_p) and returns: localctx