def parseImpl( self, instring, loc, doActions=True ):
        self_expr_parse = self.expr._parse
        self_skip_ignorables = self._skipIgnorables
        check_ender = self.not_ender is not None
        if check_ender:
            try_not_ender = self.not_ender.tryParse
        
        # must be at least one (but first see if we are the stopOn sentinel;
        # if so, fail)
        if check_ender:
            try_not_ender(instring, loc)
        loc, tokens = self_expr_parse( instring, loc, doActions, callPreParse=False )
        try:
            hasIgnoreExprs = (not not self.ignoreExprs)
            while 1:
                if check_ender:
                    try_not_ender(instring, loc)
                if hasIgnoreExprs:
                    preloc = self_skip_ignorables( instring, loc )
                else:
                    preloc = loc
                loc, tmptokens = self_expr_parse( instring, preloc, doActions )
                if tmptokens or tmptokens.haskeys():
                    tokens += tmptokens
        except (ParseException,__HOLE__):
            pass

        return loc, tokens
dataset/ETHPy150Open pypa/pip/pip/_vendor/pyparsing.py/OneOrMore.parseImpl