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from compressor.base import Compressor, SOURCE_HUNK, SOURCE_FILE
from compressor.conf import settings
class CssCompressor(Compressor):
def __init__(self, content=None, output_prefix="css", context=None):
filters = list(settings.COMPRESS_CSS_FILTERS)
super(CssCompressor, self).__init__(content, output_prefix, context, filters)
def split_contents(self):
if self.split_content:
return self.split_content
self.media_nodes = []
for elem in self.parser.css_elems():
data = None
elem_name = self.parser.elem_name(elem)
elem_attribs = self.parser.elem_attribs(elem)
if elem_name == 'link' and 'rel' in elem_attribs and elem_attribs['rel'].lower() == 'stylesheet':
basename = self.get_basename(elem_attribs['href'])
filename = self.get_filename(basename)
data = (SOURCE_FILE, filename, basename, elem)
elif elem_name == 'style':
data = (SOURCE_HUNK, self.parser.elem_content(elem), None, elem)
if data:
self.split_content.append(data)
media = elem_attribs.get('media', None)
# Append to the previous node if it had the same media type
append_to_previous = self.media_nodes and self.media_nodes[-1][0] == media
# and we are not just precompiling, otherwise create a new node.
if append_to_previous and settings.COMPRESS_ENABLED:
self.media_nodes[-1][1].split_content.append(data)
else:
node = self.__class__(content=self.parser.elem_str(elem),
context=self.context)
node.split_content.append(data)
self.media_nodes.append((media, node))
return self.split_content
def output(self, *args, **kwargs):
if (settings.COMPRESS_ENABLED or settings.COMPRESS_PRECOMPILERS or
kwargs.get('forced', False)):
# Populate self.split_content
self.split_contents()
if hasattr(self, 'media_nodes'):
ret = []
for media, subnode in self.media_nodes:
subnode.extra_context.update({'media': media})
ret.append(subnode.output(*args, **kwargs))
return ''.join(ret)
return super(CssCompressor, self).output(*args, **kwargs)
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