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Chris Roby
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May 23, 2014
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import subprocess | ||
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from compressor.exceptions import FilterError | ||
from compressor.filters import CompilerFilter | ||
from compressor.js import JsCompressor | ||
from compressor.utils.stringformat import FormattableString as fstr | ||
from django.conf import settings | ||
from django.utils.safestring import mark_safe | ||
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# For use with node.js' uglifyjs minifier | ||
class UglifySourcemapFilter(CompilerFilter): | ||
command = ( | ||
"uglifyjs {infiles} -o {outfile} --source-map {mapfile}" | ||
" --source-map-url {mapurl} --source-map-root {maproot} -c -m") | ||
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def input(self, **kwargs): | ||
return self.content | ||
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def output(self, **kwargs): | ||
options = dict(self.options) | ||
options['outfile'] = kwargs['outfile'] | ||
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infiles = [] | ||
for infile in kwargs['content_meta']: | ||
# type, full_filename, relative_filename | ||
infiles.append(infile[2]) | ||
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options['infiles'] = ' '.join(f for f in infiles) | ||
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options['mapfile'] = kwargs['outfile'].replace('.js', '.map.js') | ||
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options['mapurl'] = '{}{}'.format( | ||
settings.STATIC_URL, options['mapfile']) | ||
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options['maproot'] = settings.STATIC_URL | ||
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self.cwd = kwargs['root_location'] | ||
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try: | ||
command = fstr(self.command).format(**options) | ||
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proc = subprocess.Popen( | ||
command, shell=True, cwd=self.cwd, stdout=self.stdout, | ||
stdin=self.stdin, stderr=self.stderr) | ||
err = proc.communicate() | ||
except (IOError, OSError), e: | ||
raise FilterError('Unable to apply %s (%r): %s' % | ||
(self.__class__.__name__, self.command, e)) | ||
else: | ||
if proc.wait() != 0: | ||
if not err: | ||
err = ('Unable to apply %s (%s)' % | ||
(self.__class__.__name__, self.command)) | ||
raise FilterError(err) | ||
if self.verbose: | ||
self.logger.debug(err) | ||
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class JsUglifySourcemapCompressor(JsCompressor): | ||
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def output(self, mode='file', forced=False): | ||
content = self.filter_input(forced) | ||
if not content: | ||
return '' | ||
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concatenated_content = '\n'.join( | ||
c.encode(self.charset) for c in content) | ||
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if settings.COMPRESS_ENABLED or forced: | ||
filepath = self.get_filepath(concatenated_content, basename=None) | ||
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# UglifySourcemapFilter writes the file directly, as it needs to | ||
# output the sourcemap as well | ||
UglifySourcemapFilter(content).output( | ||
outfile=filepath, | ||
content_meta=self.split_content, | ||
root_location=self.storage.base_location) | ||
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return self.output_file(mode, filepath) | ||
else: | ||
return concatenated_content | ||
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def output_file(self, mode, new_filepath): | ||
""" | ||
The output method that saves the content to a file and renders | ||
the appropriate template with the file's URL. | ||
""" | ||
url = mark_safe(self.storage.url(new_filepath)) | ||
return self.render_output(mode, {"url": url}) |