from Globals import InitializeClass

_excluded_html = [            
    (('center', 'span', 'tt', 'big', 'small', 'u', 's', 'strike', 'basefont', 'font', 'title', 'meta'), ()),
    ((), ('dir','lang','valign','halign','border','frame','rules','cellspacing','cellpadding','bgcolor')),
    (('table','th','td'),('width','height')),
]

from OFS.SimpleItem import SimpleItem
class TatsKupuLibraryTool(SimpleItem):

    id = 'kupu_library_tool'
    meta_type = "Tats Kupu Library Tool"

    def __init__(self):
        self.html_exclusions = _excluded_html

    def getHtmlExclusions(self):
        return _excluded_html

    def getStyleWhitelist(self):
        return ['text-align', 'list-style-type', 'float']

    def getClassBlacklist(self):
        return []

    def installBeforeUnload(self):
        return getattr(self, 'install_beforeunload', True)

    def isKupuEnabled(self, useragent='', allowAnonymous=False, REQUEST=None, context=None, fieldName=None):
        def numerics(s):
            '''Convert a string into a tuple of all digit sequences
            '''
            seq = ['']
            for c in s:
                if c.isdigit():
                    seq[-1] = seq[-1] + c
                elif seq[-1]:
                    seq.append('')
            return tuple([ int(val) for val in seq if val])

        # Then check whether the current content allows html
        if context is not None and fieldName and hasattr(context, 'getWrappedField'):
            field = context.getWrappedField(fieldName)
            if field:
                allowedTypes = getattr(field, 'allowable_content_types', None)
                if allowedTypes is not None and not 'text/html' in [t.lower() for t in allowedTypes]:
                    return False

        # Then check whether their browser supports it.
        if not useragent:
            useragent = REQUEST['HTTP_USER_AGENT']

        if 'Opera' in useragent or 'BEOS' in useragent:
            return False

        if not useragent.startswith('Mozilla/'):
            return False

        try:
            mozillaver = numerics(useragent[len('Mozilla/'):].split(' ')[0])
            if mozillaver > (5,0):
                return True
            elif mozillaver == (5,0):
                rv = useragent.find(' rv:')
                if rv >= 0:
                    verno = numerics(useragent[rv+4:].split(')')[0])
                    return verno >= (1,3,1)

            MSIE = useragent.find('MSIE')
            if MSIE >= 0:
                verno = numerics(useragent[MSIE+4:].split(';')[0])
                return verno >= (5,5)

        except:
            # In case some weird browser makes the test code blow up.
            pass
        return False


InitializeClass(TatsKupuLibraryTool)