pyparsing.py 文件源码

def __init__( self, initChars, bodyChars=None, min=1, max=0, exact=0, asKeyword=False, excludeChars=None ):
        super(Word,self).__init__()
        if excludeChars:
            initChars = ''.join(c for c in initChars if c not in excludeChars)
            if bodyChars:
                bodyChars = ''.join(c for c in bodyChars if c not in excludeChars)
        self.initCharsOrig = initChars
        self.initChars = set(initChars)
        if bodyChars :
            self.bodyCharsOrig = bodyChars
            self.bodyChars = set(bodyChars)
        else:
            self.bodyCharsOrig = initChars
            self.bodyChars = set(initChars)

        self.maxSpecified = max > 0

        if min < 1:
            raise ValueError("cannot specify a minimum length < 1; use Optional(Word()) if zero-length word is permitted")

        self.minLen = min

        if max > 0:
            self.maxLen = max
        else:
            self.maxLen = _MAX_INT

        if exact > 0:
            self.maxLen = exact
            self.minLen = exact

        self.name = _ustr(self)
        self.errmsg = "Expected " + self.name
        self.mayIndexError = False
        self.asKeyword = asKeyword

        if ' ' not in self.initCharsOrig+self.bodyCharsOrig and (min==1 and max==0 and exact==0):
            if self.bodyCharsOrig == self.initCharsOrig:
                self.reString = "[%s]+" % _escapeRegexRangeChars(self.initCharsOrig)
            elif len(self.initCharsOrig) == 1:
                self.reString = "%s[%s]*" % \
                                      (re.escape(self.initCharsOrig),
                                      _escapeRegexRangeChars(self.bodyCharsOrig),)
            else:
                self.reString = "[%s][%s]*" % \
                                      (_escapeRegexRangeChars(self.initCharsOrig),
                                      _escapeRegexRangeChars(self.bodyCharsOrig),)
            if self.asKeyword:
                self.reString = r"\b"+self.reString+r"\b"
            try:
                self.re = re.compile( self.reString )
            except Exception:
                self.re = None