'make lazy-extractors' creates the youtube_dl/extractor/lazy_extractors.py (imported by youtube_dl/extractor/__init__.py), which contains simplified classes that only have the 'suitable' class method and that load the appropiate class with the '__new__' method when a instance is created.master
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1b3d5e05a8
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779822d945
5 changed files with 100 additions and 9 deletions
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# flake8: noqa |
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from __future__ import unicode_literals |
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import re |
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class LazyLoadExtractor(object): |
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_module = None |
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@classmethod |
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def ie_key(cls): |
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return cls.__name__[:-2] |
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def __new__(cls): |
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mod = __import__(cls._module, fromlist=(cls.__name__,)) |
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real_cls = getattr(mod, cls.__name__) |
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return real_cls.__new__(real_cls) |
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from __future__ import unicode_literals, print_function |
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from inspect import getsource |
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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 |
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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 = [module_template + '\n' + getsource(InfoExtractor.suitable)] |
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ie_template = ''' |
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class {name}(LazyLoadExtractor): |
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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 {!r} |
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''' |
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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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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 += 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(ie._make_valid_url()) |
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return s |
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names = [] |
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for ie in _ALL_CLASSES: |
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name = ie.ie_key() + 'IE' |
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src = build_lazy_ie(ie, name) |
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module_contents.append(src) |
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names.append(name) |
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module_contents.append( |
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'_ALL_CLASSES = [{}]'.format(', '.join(names))) |
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module_src = '\n'.join(module_contents) |
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with open(lazy_extractors_filename, 'wt') as f: |
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f.write(module_src) |
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