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"""Default URL reading functions"""
__all__ = ['_defaultFetcher']
__docformat__ = 'restructuredtext'
__version__ = '$Id: tokenize2.py 1547 2008-12-10 20:42:26Z cthedot $'
import cssutils
from cssutils import VERSION
import encutils
from . import errorhandler
import urllib.request, urllib.error, urllib.parse
log = errorhandler.ErrorHandler()
def _defaultFetcher(url):
"""Retrieve data from ``url``. cssutils default implementation of fetch
URL function.
Returns ``(encoding, string)`` or ``None``
"""
try:
request = urllib.request.Request(url)
request.add_header('User-agent',
'cssutils %s (http://www.cthedot.de/cssutils/)' % VERSION)
res = urllib.request.urlopen(request)
except urllib.error.HTTPError as e:
# http error, e.g. 404, e can be raised
log.warn('HTTPError opening url=%s: %s %s' %
(url, e.code, e.msg), error=e)
except urllib.error.URLError as e:
# URLError like mailto: or other IO errors, e can be raised
log.warn('URLError, %s' % e.reason, error=e)
except OSError as e:
# e.g if file URL and not found
log.warn(e, error=OSError)
except ValueError as e:
# invalid url, e.g. "1"
log.warn('ValueError, %s' % e.args[0], error=ValueError)
else:
if res:
mimeType, encoding = encutils.getHTTPInfo(res)
if mimeType != 'text/css':
log.error('Expected "text/css" mime type for url=%r but found: %r' %
(url, mimeType), error=ValueError)
content = res.read()
if hasattr(res, 'close'):
res.close()
return encoding, content
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