Current File : //usr/lib/calibre/calibre/ebooks/oeb/transforms/trimmanifest.py
'''
OPF manifest trimming transform.
'''
__license__ = 'GPL v3'
__copyright__ = '2008, Marshall T. Vandegrift <llasram@gmail.com>'
from calibre.ebooks.oeb.base import CSS_MIME, OEB_DOCS
from calibre.ebooks.oeb.base import urlnormalize, iterlinks
from polyglot.urllib import urldefrag
class ManifestTrimmer:
@classmethod
def config(cls, cfg):
return cfg
@classmethod
def generate(cls, opts):
return cls()
def __call__(self, oeb, context):
import css_parser
oeb.logger.info('Trimming unused files from manifest...')
self.opts = context
used = set()
for term in oeb.metadata:
for item in oeb.metadata[term]:
if item.value in oeb.manifest.hrefs:
used.add(oeb.manifest.hrefs[item.value])
elif item.value in oeb.manifest.ids:
used.add(oeb.manifest.ids[item.value])
for ref in oeb.guide.values():
path, _ = urldefrag(ref.href)
if path in oeb.manifest.hrefs:
used.add(oeb.manifest.hrefs[path])
# TOC items are required to be in the spine
for item in oeb.spine:
used.add(item)
unchecked = used
while unchecked:
new = set()
for item in unchecked:
if (item.media_type in OEB_DOCS or
item.media_type[-4:] in ('/xml', '+xml')) and \
item.data is not None:
hrefs = [r[2] for r in iterlinks(item.data)]
for href in hrefs:
if isinstance(href, bytes):
href = href.decode('utf-8')
try:
href = item.abshref(urlnormalize(href))
except:
continue
if href in oeb.manifest.hrefs:
found = oeb.manifest.hrefs[href]
if found not in used:
new.add(found)
elif item.media_type == CSS_MIME:
for href in css_parser.getUrls(item.data):
href = item.abshref(urlnormalize(href))
if href in oeb.manifest.hrefs:
found = oeb.manifest.hrefs[href]
if found not in used:
new.add(found)
used.update(new)
unchecked = new
for item in oeb.manifest.values():
if item not in used:
oeb.logger.info('Trimming %r from manifest' % item.href)
oeb.manifest.remove(item)
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