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from compressor.base import Compressor, SOURCE_HUNK, SOURCE_FILE
from compressor.conf import settings
class CssCompressor(Compressor):
output_mimetypes = {"text/css"}
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.copy(content=self.parser.elem_str(elem))
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().output(*args, **kwargs)
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