yt-dlp/devscripts/make_lazy_extractors.py

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#!/usr/bin/env python3
import optparse
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import os
import sys
from inspect import getsource
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
NO_ATTR = object()
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STATIC_CLASS_PROPERTIES = ['IE_NAME', 'IE_DESC', 'SEARCH_KEY', '_WORKING', '_NETRC_MACHINE', 'age_limit']
CLASS_METHODS = [
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'ie_key', 'working', 'description', 'suitable', '_match_valid_url', '_match_id', 'get_temp_id', 'is_suitable'
]
IE_TEMPLATE = '''
class {name}({bases}):
_module = {module!r}
'''
with open('devscripts/lazy_load_template.py', encoding='utf-8') as f:
MODULE_TEMPLATE = f.read()
def main():
parser = optparse.OptionParser(usage='%prog [OUTFILE.py]')
args = parser.parse_args()[1] or ['yt_dlp/extractor/lazy_extractors.py']
if len(args) != 1:
parser.error('Expected only an output filename')
lazy_extractors_filename = args[0]
if os.path.exists(lazy_extractors_filename):
os.remove(lazy_extractors_filename)
_ALL_CLASSES = get_all_ies() # Must be before import
from yt_dlp.extractor.common import InfoExtractor, SearchInfoExtractor
DummyInfoExtractor = type('InfoExtractor', (InfoExtractor,), {'IE_NAME': NO_ATTR})
module_src = '\n'.join((
MODULE_TEMPLATE,
' _module = None',
*extra_ie_code(DummyInfoExtractor),
'\nclass LazyLoadSearchExtractor(LazyLoadExtractor):\n pass\n',
*build_ies(_ALL_CLASSES, (InfoExtractor, SearchInfoExtractor), DummyInfoExtractor),
))
with open(lazy_extractors_filename, 'wt', encoding='utf-8') as f:
f.write(f'{module_src}\n')
def get_all_ies():
PLUGINS_DIRNAME = 'ytdlp_plugins'
BLOCKED_DIRNAME = f'{PLUGINS_DIRNAME}_blocked'
if os.path.exists(PLUGINS_DIRNAME):
os.rename(PLUGINS_DIRNAME, BLOCKED_DIRNAME)
try:
from yt_dlp.extractor.extractors import _ALL_CLASSES
finally:
if os.path.exists(BLOCKED_DIRNAME):
os.rename(BLOCKED_DIRNAME, PLUGINS_DIRNAME)
return _ALL_CLASSES
def extra_ie_code(ie, base=None):
for var in STATIC_CLASS_PROPERTIES:
val = getattr(ie, var)
if val != (getattr(base, var) if base else NO_ATTR):
yield f' {var} = {val!r}'
yield ''
for name in CLASS_METHODS:
f = getattr(ie, name)
if not base or f.__func__ != getattr(base, name).__func__:
yield getsource(f)
def build_ies(ies, bases, attr_base):
names = []
for ie in sort_ies(ies, bases):
yield build_lazy_ie(ie, ie.__name__, attr_base)
if ie in ies:
names.append(ie.__name__)
yield f'\n_ALL_CLASSES = [{", ".join(names)}]'
def sort_ies(ies, ignored_bases):
"""find the correct sorting and add the required base classes so that subclasses can be correctly created"""
classes, returned_classes = ies[:-1], set()
assert ies[-1].__name__ == 'GenericIE', 'Last IE must be GenericIE'
while classes:
for c in classes[:]:
bases = set(c.__bases__) - {object, *ignored_bases}
restart = False
for b in bases:
if b not in classes and b not in returned_classes:
assert b.__name__ != 'GenericIE', 'Cannot inherit from GenericIE'
classes.insert(0, b)
restart = True
if restart:
break
if bases <= returned_classes:
yield c
returned_classes.add(c)
classes.remove(c)
break
yield ies[-1]
def build_lazy_ie(ie, name, attr_base):
bases = ', '.join({
'InfoExtractor': 'LazyLoadExtractor',
'SearchInfoExtractor': 'LazyLoadSearchExtractor',
}.get(base.__name__, base.__name__) for base in ie.__bases__)
s = IE_TEMPLATE.format(name=name, module=ie.__module__, bases=bases)
valid_url = getattr(ie, '_VALID_URL', None)
if not valid_url and hasattr(ie, '_make_valid_url'):
valid_url = ie._make_valid_url()
if valid_url:
s += f' _VALID_URL = {valid_url!r}\n'
return s + '\n'.join(extra_ie_code(ie, attr_base))
if __name__ == '__main__':
main()