BeautifulSoup.py 文件源码

def _matches(self, markup, matchAgainst):
        #print "Matching %s against %s" % (markup, matchAgainst)
        result = False
        if matchAgainst == True and type(matchAgainst) == types.BooleanType:
            result = markup != None
        elif callable(matchAgainst):
            result = matchAgainst(markup)
        else:
            #Custom match methods take the tag as an argument, but all
            #other ways of matching match the tag name as a string.
            if isinstance(markup, Tag):
                markup = markup.name
            if markup and not isString(markup):
                markup = unicode(markup)
            #Now we know that chunk is either a string, or None.
            if hasattr(matchAgainst, 'match'):
                # It's a regexp object.
                result = markup and matchAgainst.search(markup)
            elif isList(matchAgainst):
                result = markup in matchAgainst
            elif hasattr(matchAgainst, 'items'):
                result = markup.has_key(matchAgainst)
            elif matchAgainst and isString(markup):
                if isinstance(markup, unicode):
                    matchAgainst = unicode(matchAgainst)
                else:
                    matchAgainst = str(matchAgainst)

            if not result:
                result = matchAgainst == markup
        return result