code: def bra(self):
      localctx = LaTeXParser.BraContext(self, self._ctx, self.state)
      self.enterRule(localctx, 46, self.RULE_bra)
      self._la = 0  # Token type
      try:
          self.enterOuterAlt(localctx, 1)
          self.state = 319
          self.match(LaTeXParser.L_ANGLE)
          self.state = 320
          self.expr()
          self.state = 321
          _la = self._input.LA(1)
          if not (_la == 27 or _la == 28):
              self._errHandler.recoverInline(self)
          else:
              self._errHandler.reportMatch(self)
              self.consume()
      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 25 for calling the LaTeXParser obj's underlying member method code with example usage: obj.bra() and returns: localctx