Method enterOuterAlt

runtime/Python3/src/antlr4/Parser.py:388–396

(self, localctx:ParserRuleContext, altNum:int)

        self._ctx = self._ctx.parentCtx

    def enterOuterAlt(self, localctx:ParserRuleContext, altNum:int):
        localctx.setAltNumber(altNum)
        # if we have new localctx, make sure we replace existing ctx
        # that is previous child of parse tree
        if self.buildParseTrees and self._ctx != localctx:
            if self._ctx.parentCtx is not None:
                self._ctx.parentCtx.removeLastChild()
                self._ctx.parentCtx.addChild(localctx)
        self._ctx = localctx

    # Get the precedence level for the top-most precedence rule.
    #