pyparsing.py 文件源码

def __init__( self, matchString ):
        super(Literal,self).__init__()
        self.match = matchString
        self.matchLen = len(matchString)
        try:
            self.firstMatchChar = matchString[0]
        except IndexError:
            warnings.warn("null string passed to Literal; use Empty() instead",
                            SyntaxWarning, stacklevel=2)
            self.__class__ = Empty
        self.name = '"%s"' % _ustr(self.match)
        self.errmsg = "Expected " + self.name
        self.mayReturnEmpty = False
        self.mayIndexError = False

    # Performance tuning: this routine gets called a *lot*
    # if this is a single character match string  and the first character matches,
    # short-circuit as quickly as possible, and avoid calling startswith
    #~ @profile