[npo] Generalize playlist extractors

youtube_dl/extractor/npo.py

@@ -438,9 +438,29 @@ class SchoolTVIE(InfoExtractor):
         }
 
 
-class VPROIE(NPOIE):
+class NPOPlaylistBaseIE(NPOIE):
+    def _real_extract(self, url):
+        playlist_id = self._match_id(url)
+
+        webpage = self._download_webpage(url, playlist_id)
+
+        entries = [
+            self.url_result('npo:%s' % video_id if not video_id.startswith('http') else video_id)
+            for video_id in re.findall(self._PLAYLIST_ENTRY_RE, webpage)
+        ]
+
+        playlist_title = self._html_search_regex(
+            self._PLAYLIST_TITLE_RE, webpage, 'playlist title',
+            default=None) or self._og_search_title(webpage)
+
+        return self.playlist_result(entries, playlist_id, playlist_title)
+
+
+class VPROIE(NPOPlaylistBaseIE):
     IE_NAME = 'vpro'
     _VALID_URL = r'https?://(?:www\.)?(?:tegenlicht\.)?vpro\.nl/(?:[^/]+/){2,}(?P<id>[^/]+)\.html'
+    _PLAYLIST_TITLE_RE = r'<title>\s*([^>]+?)\s*-\s*Teledoc\s*-\s*VPRO\s*</title>'
+    _PLAYLIST_ENTRY_RE = r'data-media-id="([^"]+)"'
 
     _TESTS = [
         {
@@ -473,48 +493,17 @@ class VPROIE(NPOIE):
         }
     ]
 
-    def _real_extract(self, url):
-        playlist_id = self._match_id(url)
-
-        webpage = self._download_webpage(url, playlist_id)
-
-        entries = [
-            self.url_result('npo:%s' % video_id if not video_id.startswith('http') else video_id)
-            for video_id in re.findall(r'data-media-id="([^"]+)"', webpage)
-        ]
-
-        playlist_title = self._search_regex(
-            r'<title>\s*([^>]+?)\s*-\s*Teledoc\s*-\s*VPRO\s*</title>',
-            webpage, 'playlist title', default=None) or self._og_search_title(webpage)
-
-        return self.playlist_result(entries, playlist_id, playlist_title)
-
 
-class WNLIE(InfoExtractor):
+class WNLIE(NPOPlaylistBaseIE):
     _VALID_URL = r'https?://(?:www\.)?omroepwnl\.nl/video/detail/(?P<id>[^/]+)__\d+'
+    _PLAYLIST_TITLE_RE = r'(?s)<h1[^>]+class="subject"[^>]*>(.+?)</h1>'
+    _PLAYLIST_ENTRY_RE = r'<a[^>]+href="([^"]+)"[^>]+class="js-mid"[^>]*>Deel \d+'
 
-    _TEST = {
+    _TESTS = [{
         'url': 'http://www.omroepwnl.nl/video/detail/vandaag-de-dag-6-mei__060515',
         'info_dict': {
             'id': 'vandaag-de-dag-6-mei',
             'title': 'Vandaag de Dag 6 mei',
         },
         'playlist_count': 4,
-    }
-
-    def _real_extract(self, url):
-        playlist_id = self._match_id(url)
-
-        webpage = self._download_webpage(url, playlist_id)
-
-        entries = [
-            self.url_result('npo:%s' % video_id, 'NPO')
-            for video_id, part in re.findall(
-                r'<a[^>]+href="([^"]+)"[^>]+class="js-mid"[^>]*>(Deel \d+)', webpage)
-        ]
-
-        playlist_title = self._html_search_regex(
-            r'(?s)<h1[^>]+class="subject"[^>]*>(.+?)</h1>',
-            webpage, 'playlist title')
-
-        return self.playlist_result(entries, playlist_id, playlist_title)
+    }]