[InfoExtractor] Add `_match_valid_url()` class method and refactor

* API compatible with yt-dlp
* also support Sequence of patterns in _VALID_URL
* one place to compile _VALID_URL
* TODO: remove existing extractor shims

devscripts/make_lazy_extractors.py

@@ -4,6 +4,7 @@ from inspect import getsource
 import io
 import os
 from os.path import dirname as dirn
+import re
 import sys
 
 print('WARNING: Lazy loading extractors is an experimental feature that may not always work', file=sys.stderr)
@@ -29,11 +30,18 @@ from youtube_dl.extractor.common import InfoExtractor, SearchInfoExtractor
 with open('devscripts/lazy_load_template.py', 'rt') as f:
     module_template = f.read()
 
+
+def get_source(m):
+    return re.sub(r'(?m)^\s*#.*\n', '', getsource(m))
+
+
 module_contents = [
-    module_template + '\n' + getsource(InfoExtractor.suitable) + '\n',
+    module_template,
+    get_source(InfoExtractor.suitable),
+    get_source(InfoExtractor._match_valid_url) + '\n',
     'class LazyLoadSearchExtractor(LazyLoadExtractor):\n    pass\n',
     # needed for suitable() methods of Youtube extractor (see #28780)
-    'from youtube_dl.utils import parse_qs\n',
+    'from youtube_dl.utils import parse_qs, variadic\n',
 ]
 
 ie_template = '''
@@ -66,7 +74,7 @@ def build_lazy_ie(ie, name):
         valid_url=valid_url,
         module=ie.__module__)
     if ie.suitable.__func__ is not InfoExtractor.suitable.__func__:
-        s += '\n' + getsource(ie.suitable)
+        s += '\n' + get_source(ie.suitable)
     if hasattr(ie, '_make_valid_url'):
         # search extractors
         s += make_valid_template.format(valid_url=ie._make_valid_url())

youtube_dl/extractor/common.py

@@ -83,6 +83,7 @@ from ..utils import (
     urljoin,
     url_basename,
     url_or_none,
+    variadic,
     xpath_element,
     xpath_text,
     xpath_with_ns,
@@ -371,9 +372,22 @@ class InfoExtractor(object):
     title, description etc.
 
 
-    Subclasses of this one should re-define the _real_initialize() and
-    _real_extract() methods and define a _VALID_URL regexp.
-    Probably, they should also be added to the list of extractors.
+    A subclass of InfoExtractor must be defined to handle each specific site (or
+    several sites). Such a concrete subclass should be added to the list of
+    extractors. It should also:
+    * define its _VALID_URL attribute as a regexp, or a Sequence of alternative
+      regexps (but see below)
+    * re-define the _real_extract() method
+    * optionally re-define the _real_initialize() method.
+
+    An extractor subclass may also override suitable() if necessary, but the
+    function signature must be preserved and the function must import everything
+    it needs (except other extractors), so that lazy_extractors works correctly.
+    If the subclass's suitable() and _real_extract() functions avoid using
+    _VALID_URL, the subclass need not set that class attribute.
+
+    An abstract subclass of InfoExtractor may be used to simplify implementation
+    within an extractor module; it should not be added to the list of extractors.
 
     _GEO_BYPASS attribute may be set to False in order to disable
     geo restriction bypass mechanisms for a particular extractor.
@@ -408,22 +422,33 @@ class InfoExtractor(object):
         self._x_forwarded_for_ip = None
         self.set_downloader(downloader)
 
+    @classmethod
+    def __match_valid_url(cls, url):
+        # This does not use has/getattr intentionally - we want to know whether
+        # we have cached the regexp for cls, whereas getattr would also
+        # match its superclass
+        if '_VALID_URL_RE' not in cls.__dict__:
+            # _VALID_URL can now be a list/tuple of patterns
+            cls._VALID_URL_RE = tuple(map(re.compile, variadic(cls._VALID_URL)))
+        # 20% faster than next(filter(None, (p.match(url) for p in cls._VALID_URL_RE)), None) in 2.7
+        for p in cls._VALID_URL_RE:
+            p = p.match(url)
+            if p:
+                return p
+
+    # The public alias can safely be overridden, as in some back-ports
+    _match_valid_url = __match_valid_url
+
     @classmethod
     def suitable(cls, url):
         """Receives a URL and returns True if suitable for this IE."""
-
-        # This does not use has/getattr intentionally - we want to know whether
-        # we have cached the regexp for *this* class, whereas getattr would also
-        # match the superclass
-        if '_VALID_URL_RE' not in cls.__dict__:
-            cls._VALID_URL_RE = re.compile(cls._VALID_URL)
-        return cls._VALID_URL_RE.match(url) is not None
+        # This function must import everything it needs (except other extractors),
+        # so that lazy_extractors works correctly
+        return cls.__match_valid_url(url) is not None
 
     @classmethod
     def _match_id(cls, url):
-        if '_VALID_URL_RE' not in cls.__dict__:
-            cls._VALID_URL_RE = re.compile(cls._VALID_URL)
-        m = cls._VALID_URL_RE.match(url)
+        m = cls.__match_valid_url(url)
         assert m
         return compat_str(m.group('id'))
 

youtube_dl/extractor/globalplayer.py

@@ -18,12 +18,6 @@ from ..utils import (
 
 class GlobalPlayerBaseIE(InfoExtractor):
 
-    import re
-
-    @classmethod
-    def _match_valid_url(cls, url):
-        return cls.re.match(cls._VALID_URL, url)
-
     def _get_page_props(self, url, video_id):
         webpage = self._download_webpage(url, video_id)
         return self._search_nextjs_data(webpage, video_id)['props']['pageProps']