def __get_parser(self, engine):
charset = (settings.FILE_CHARSET
if settings.is_overridden('FILE_CHARSET') else 'utf-8')
if engine == "jinja2":
from compressor.offline.jinja2 import Jinja2Parser
env = settings.COMPRESS_JINJA2_GET_ENVIRONMENT()
parser = Jinja2Parser(charset=charset, env=env)
elif engine == "django":
from compressor.offline.django import DjangoParser
parser = DjangoParser(charset=charset)
else:
raise OfflineGenerationError(
"Invalid templating engine specified.")
return parser
class CompilerFilter(FilterBase):
"""
A filter subclass that is able to filter content via
external commands.
"""
command = None
options = ()
default_encoding = (settings.FILE_CHARSET
if settings.is_overridden('FILE_CHARSET') else 'utf-8')
def __init__(self, content, command=None, **kwargs):
super(CompilerFilter, self).__init__(content, **kwargs)
self.cwd = None
if command:
self.command = command
if self.command is None:
raise FilterError("Required attribute 'command' not given")
if isinstance(self.options, dict):
# turn dict into a tuple
new_options = ()
for item in self.options.items():
new_options += (item, )
self.options = new_options
# append kwargs to self.options
for item in kwargs.items():
self.options += (item, )
self.stdout = self.stdin = self.stderr = subprocess.PIPE
self.infile = self.outfile = None
def input(self, **kwargs):
encoding = self.default_encoding
options = dict(self.options)
if self.infile is None and "{infile}" in self.command:
# create temporary input file if needed
if self.filename is None:
self.infile = NamedTemporaryFile(mode='wb')
self.infile.write(self.content.encode(encoding))
self.infile.flush()
options["infile"] = self.infile.name
else:
# we use source file directly, which may be encoded using
# something different than utf8. If that's the case file will
# be included with charset="something" html attribute and
# charset will be available as filter's charset attribute
encoding = self.charset # or self.default_encoding
self.infile = open(self.filename)
options["infile"] = self.filename
if "{outfile}" in self.command and "outfile" not in options:
# create temporary output file if needed
ext = self.type and ".%s" % self.type or ""
self.outfile = NamedTemporaryFile(mode='r+', suffix=ext)
options["outfile"] = self.outfile.name
# Quote infile and outfile for spaces etc.
if "infile" in options:
options["infile"] = shell_quote(options["infile"])
if "outfile" in options:
options["outfile"] = shell_quote(options["outfile"])
try:
command = self.command.format(**options)
proc = subprocess.Popen(command,
shell=True,
cwd=self.cwd,
stdout=self.stdout,
stdin=self.stdin,
stderr=self.stderr)
if self.infile is None:
# if infile is None then send content to process' stdin
filtered, err = proc.communicate(self.content.encode(encoding))
else:
filtered, err = proc.communicate()
filtered, err = filtered.decode(encoding), err.decode(encoding)
except (IOError, OSError) as e:
raise FilterError('Unable to apply %s (%r): %s' %
(self.__class__.__name__, self.command, e))
else:
if proc.wait() != 0:
# command failed, raise FilterError exception
if not err:
err = ('Unable to apply %s (%s)' %
(self.__class__.__name__, self.command))
if filtered:
err += '\n%s' % filtered
raise FilterError(err)
if self.verbose:
self.logger.debug(err)
outfile_path = options.get('outfile')
if outfile_path:
with io.open(outfile_path, 'r', encoding=encoding) as file:
filtered = file.read()
finally:
if self.infile is not None:
self.infile.close()
if self.outfile is not None:
self.outfile.close()
return smart_str(filtered)
