code: def unary(self):
      localctx = LaTeXParser.UnaryContext(self, self._ctx, self.state)
      self.enterRule(localctx, 14, self.RULE_unary)
      self._la = 0  # Token type
      try:
          self.state = 141
          self._errHandler.sync(self)
          token = self._input.LA(1)
          if token in [15, 16]:
              self.enterOuterAlt(localctx, 1)
              self.state = 134
              _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 = 135
              self.unary()
              pass
          elif token in [
              19,
              21,
              23,
              25,
              27,
              29,
              30,
              32,
              34,
              35,
              36,
              37,
              38,
              39,
              40,
              41,
              42,
              43,
              44,
              45,
              46,
              47,
              48,
              49,
              50,
              51,
              52,
              53,
              54,
              55,
              56,
              57,
              58,
              59,
              61,
              63,
              64,
              68,
              69,
              70,
              71,
              72,
              76,
              77,
              78,
              91,
          ]:
              self.enterOuterAlt(localctx, 2)
              self.state = 137
              self._errHandler.sync(self)
              _alt = 1
              while _alt != 2 and _alt != ATN.INVALID_ALT_NUMBER:
                  if _alt == 1:
                      self.state = 136
                      self.postfix()
  
                  else:
                      raise NoViableAltException(self)
                  self.state = 139
                  self._errHandler.sync(self)
                  _alt = self._interp.adaptivePredict(
                      self._input, 4, self._ctx
                  )
  
              pass
          else:
              raise NoViableAltException(self)
  
      except RecognitionException as re:
          localctx.exception = re
          self._errHandler.reportError(self, re)
          self._errHandler.recover(self, re)
      finally:
          self.exitRule()
      return localctx
  
imports: from antlr4 import *
  from io import StringIO
  import sys
label_desc: Use image node_id 9 for calling the LaTeXParser obj's underlying member method code with example usage: obj.unary() and returns: localctx