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