/usr/share/pyshared/cssutils/stylesheets/medialist.py is in python-cssutils 0.9.10-1.
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TODO:
- delete: maybe if deleting from all, replace *all* with all others?
- is unknown media an exception?
"""
__all__ = ['MediaList']
__docformat__ = 'restructuredtext'
__version__ = '$Id$'
from cssutils.css import csscomment
from mediaquery import MediaQuery
import cssutils
import xml.dom
class MediaList(cssutils.util.Base, cssutils.util.ListSeq):
"""Provides the abstraction of an ordered collection of media,
without defining or constraining how this collection is
implemented.
A single media in the list is an instance of :class:`MediaQuery`.
An empty list is the same as a list that contains the medium "all".
Format from CSS2.1::
medium [ COMMA S* medium ]*
New format with :class:`MediaQuery`::
<media_query> [, <media_query> ]*
"""
def __init__(self, mediaText=None, parentRule=None, readonly=False):
"""
:param mediaText:
Unicodestring of parsable comma separared media
or a (Python) list of media.
:param parentRule:
CSSRule this medialist is used in, e.g. an @import or @media.
:param readonly:
Not used yet.
"""
super(MediaList, self).__init__()
self._wellformed = False
if isinstance(mediaText, list):
mediaText = u','.join(mediaText)
self._parentRule = parentRule
if mediaText:
self.mediaText = mediaText
self._readonly = readonly
def __repr__(self):
return "cssutils.stylesheets.%s(mediaText=%r)" % (
self.__class__.__name__, self.mediaText)
def __str__(self):
return "<cssutils.stylesheets.%s object mediaText=%r at 0x%x>" % (
self.__class__.__name__, self.mediaText, id(self))
length = property(lambda self: len(self),
doc="The number of media in the list (DOM readonly).")
def _getMediaText(self):
return cssutils.ser.do_stylesheets_medialist(self)
def _setMediaText(self, mediaText):
"""
:param mediaText:
simple value or comma-separated list of media
:exceptions:
- - :exc:`~xml.dom.SyntaxErr`:
Raised if the specified string value has a syntax error and is
unparsable.
- - :exc:`~xml.dom.NoModificationAllowedErr`:
Raised if this media list is readonly.
"""
self._checkReadonly()
wellformed = True
tokenizer = self._tokenize2(mediaText)
newseq = []
expected = None
while True:
# find all upto and including next ",", EOF or nothing
mqtokens = self._tokensupto2(tokenizer, listseponly=True)
if mqtokens:
if self._tokenvalue(mqtokens[-1]) == ',':
expected = mqtokens.pop()
else:
expected = None
mq = MediaQuery(mqtokens)
if mq.wellformed:
newseq.append(mq)
else:
wellformed = False
self._log.error(u'MediaList: Invalid MediaQuery: %s' %
self._valuestr(mqtokens))
else:
break
# post condition
if expected:
wellformed = False
self._log.error(u'MediaList: Cannot end with ",".')
if wellformed:
del self[:]
for mq in newseq:
self.appendMedium(mq)
self._wellformed = True
mediaText = property(_getMediaText, _setMediaText,
doc="The parsable textual representation of the media list.")
def __prepareset(self, newMedium):
# used by appendSelector and __setitem__
self._checkReadonly()
if not isinstance(newMedium, MediaQuery):
newMedium = MediaQuery(newMedium)
if newMedium.wellformed:
return newMedium
def __setitem__(self, index, newMedium):
"""Overwriting ListSeq.__setitem__
Any duplicate items are **not yet** removed.
"""
newMedium = self.__prepareset(newMedium)
if newMedium:
self.seq[index] = newMedium
# TODO: remove duplicates?
def appendMedium(self, newMedium):
"""Add the `newMedium` to the end of the list.
If the `newMedium` is already used, it is first removed.
:param newMedium:
a string or a :class:`~cssutils.stylesheets.MediaQuery`
:returns: Wellformedness of `newMedium`.
:exceptions:
- :exc:`~xml.dom.InvalidCharacterErr`:
If the medium contains characters that are invalid in the
underlying style language.
- :exc:`~xml.dom.InvalidModificationErr`:
If mediaText is "all" and a new medium is tried to be added.
Exception is "handheld" which is set in any case (Opera does handle
"all, handheld" special, this special case might be removed in the
future).
- :exc:`~xml.dom.NoModificationAllowedErr`:
Raised if this list is readonly.
"""
newMedium = self.__prepareset(newMedium)
if newMedium:
mts = [self._normalize(mq.mediaType) for mq in self]
newmt = self._normalize(newMedium.mediaType)
if newmt in mts:
self.deleteMedium(newmt)
self.seq.append(newMedium)
elif u'all' == newmt:
# remove all except handheld (Opera)
h = None
for mq in self:
if mq.mediaType == u'handheld':
h = mq
del self[:]
self.seq.append(newMedium)
if h:
self.append(h)
elif u'all' in mts:
if u'handheld' == newmt:
self.seq.append(newMedium)
self._log.info(u'MediaList: Already specified "all" but still setting new medium: %r' %
newMedium, error=xml.dom.InvalidModificationErr, neverraise=True)
else:
self._log.info(u'MediaList: Ignoring new medium %r as already specified "all" (set ``mediaText`` instead).' %
newMedium, error=xml.dom.InvalidModificationErr)
else:
self.seq.append(newMedium)
return True
else:
return False
def append(self, newMedium):
"Same as :meth:`appendMedium`."
self.appendMedium(newMedium)
def deleteMedium(self, oldMedium):
"""Delete a medium from the list.
:param oldMedium:
delete this medium from the list.
:exceptions:
- :exc:`~xml.dom.NotFoundErr`:
Raised if `oldMedium` is not in the list.
- :exc:`~xml.dom.NoModificationAllowedErr`:
Raised if this list is readonly.
"""
self._checkReadonly()
oldMedium = self._normalize(oldMedium)
for i, mq in enumerate(self):
if self._normalize(mq.mediaType) == oldMedium:
del self[i]
break
else:
self._log.error(u'"%s" not in this MediaList' % oldMedium,
error=xml.dom.NotFoundErr)
def item(self, index):
"""Return the mediaType of the `index`'th element in the list.
If `index` is greater than or equal to the number of media in the
list, returns ``None``.
"""
try:
return self[index].mediaType
except IndexError:
return None
parentRule = property(lambda self: self._parentRule,
doc=u"The CSSRule (e.g. an @media or @import rule "
u"this list is part of or None")
wellformed = property(lambda self: self._wellformed)
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