def media_ok(raw):
if not raw:
return True
if raw == 'amzn-mobi': # Optimization for the common case
return False
def query_ok(mq):
matched = True
if mq.media_type not in ALLOWED_MEDIA_TYPES:
matched = False
# Media queries that test for device specific features always fail
for media_feature, expr in mq.expressions:
if media_feature in IGNORED_MEDIA_FEATURES:
matched = False
return mq.negated ^ matched
try:
for mq in CSSMedia3Parser().parse_stylesheet('@media %s {}' %
raw).rules[0].media:
if query_ok(mq):
return True
return False
except Exception:
pass
return True
def test_media_queries(self):
'Test parsing of media queries from the CSS 3 media module'
for css, media_query_list, expected_errors in [
# CSS 2.1 (simple media queries)
('@media {}', [MQ()], []),
('@media all {}', [MQ()], []),
('@media screen {}', [MQ('screen')], []),
('@media , screen {}', [MQ(), MQ('screen')], []),
('@media screen, {}', [MQ('screen'), MQ()], []),
# Examples from the CSS 3 specs
('@media screen and (color) {}',
[MQ('screen', (('color', None), ))], []),
('@media all and (min-width:500px) {}',
[MQ('all', (('min-width', ('DIMENSION', 500)), ))], []),
('@media (min-width:500px) {}',
[MQ('all', (('min-width', ('DIMENSION', 500)), ))], []),
('@media (orientation: portrait) {}',
[MQ('all', (('orientation', ('IDENT', 'portrait')), ))], []),
('@media screen and (color), projection and (color) {}', [
MQ('screen', (('color', None), )),
MQ('projection', (('color', None), )),
], []),
('@media not screen and (color) {}',
[MQ('screen', (('color', None), ), True)], []),
('@media only screen and (color) {}',
[MQ('screen', (('color', None), ))], []),
('@media aural and (device-aspect-ratio: 16/9) {}',
[MQ('aural',
(('device-aspect-ratio', ('RATIO', (16, 9))), ))], []),
('@media (resolution: 166dpi) {}',
[MQ('all', (('resolution', ('DIMENSION', 166)), ))], []),
('@media (min-resolution: 166DPCM) {}',
[MQ('all', (('min-resolution', ('DIMENSION', 166)), ))], []),
# Malformed media queries
('@media (example, all,), speech {}',
[MQ(negated=True), MQ('speech')], ['expected a :']),
('@media &test, screen {}', [MQ(negated=True),
MQ('screen')],
['expected a media expression not a DELIM']),
]:
stylesheet = CSSMedia3Parser().parse_stylesheet(css)
self.assert_errors(stylesheet.errors, expected_errors)
self.ae(len(stylesheet.rules), 1)
rule = stylesheet.rules[0]
self.ae(jsonify_expressions(rule.media), media_query_list)
