mirror of
https://gitlab.com/dstftw/youtube-dl.git
synced 2020-11-16 09:42:26 +00:00
101 lines
2.8 KiB
Python
101 lines
2.8 KiB
Python
from __future__ import unicode_literals, print_function
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from inspect import getsource
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import io
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import os
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from os.path import dirname as dirn
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import sys
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print('WARNING: Lazy loading extractors is an experimental feature that may not always work', file=sys.stderr)
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sys.path.insert(0, dirn(dirn((os.path.abspath(__file__)))))
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lazy_extractors_filename = sys.argv[1]
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if os.path.exists(lazy_extractors_filename):
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os.remove(lazy_extractors_filename)
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from youtube_dl.extractor import _ALL_CLASSES
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from youtube_dl.extractor.common import InfoExtractor, SearchInfoExtractor
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with open('devscripts/lazy_load_template.py', 'rt') as f:
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module_template = f.read()
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module_contents = [
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module_template + '\n' + getsource(InfoExtractor.suitable) + '\n',
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'class LazyLoadSearchExtractor(LazyLoadExtractor):\n pass\n']
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ie_template = '''
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class {name}({bases}):
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_VALID_URL = {valid_url!r}
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_module = '{module}'
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'''
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make_valid_template = '''
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@classmethod
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def _make_valid_url(cls):
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return {valid_url!r}
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'''
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def get_base_name(base):
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if base is InfoExtractor:
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return 'LazyLoadExtractor'
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elif base is SearchInfoExtractor:
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return 'LazyLoadSearchExtractor'
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else:
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return base.__name__
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def build_lazy_ie(ie, name):
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valid_url = getattr(ie, '_VALID_URL', None)
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s = ie_template.format(
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name=name,
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bases=', '.join(map(get_base_name, ie.__bases__)),
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valid_url=valid_url,
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module=ie.__module__)
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if ie.suitable.__func__ is not InfoExtractor.suitable.__func__:
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s += '\n' + getsource(ie.suitable)
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if hasattr(ie, '_make_valid_url'):
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# search extractors
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s += make_valid_template.format(valid_url=ie._make_valid_url())
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return s
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# find the correct sorting and add the required base classes so that sublcasses
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# can be correctly created
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classes = _ALL_CLASSES[:-1]
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ordered_cls = []
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while classes:
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for c in classes[:]:
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bases = set(c.__bases__) - set((object, InfoExtractor, SearchInfoExtractor))
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stop = False
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for b in bases:
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if b not in classes and b not in ordered_cls:
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if b.__name__ == 'GenericIE':
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exit()
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classes.insert(0, b)
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stop = True
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if stop:
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break
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if all(b in ordered_cls for b in bases):
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ordered_cls.append(c)
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classes.remove(c)
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break
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ordered_cls.append(_ALL_CLASSES[-1])
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names = []
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for ie in ordered_cls:
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name = ie.__name__
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src = build_lazy_ie(ie, name)
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module_contents.append(src)
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if ie in _ALL_CLASSES:
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names.append(name)
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module_contents.append(
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'_ALL_CLASSES = [{0}]'.format(', '.join(names)))
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module_src = '\n'.join(module_contents) + '\n'
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with io.open(lazy_extractors_filename, 'wt', encoding='utf-8') as f:
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f.write(module_src)
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