[utils] Add orderedSet_from_options

yt_dlp/YoutubeDL.py

@@ -115,6 +115,7 @@ from .utils import (
     network_exceptions,
     number_of_digits,
     orderedSet,
+    orderedSet_from_options,
     parse_filesize,
     preferredencoding,
     prepend_extension,
@@ -2737,27 +2738,11 @@ class YoutubeDL:
         if self.params.get('allsubtitles', False):
             requested_langs = all_sub_langs
         elif self.params.get('subtitleslangs', False):
-            # A list is used so that the order of languages will be the same as
-            # given in subtitleslangs. See https://github.com/yt-dlp/yt-dlp/issues/1041
-            requested_langs = []
-            for lang_re in self.params.get('subtitleslangs'):
-                discard = lang_re[0] == '-'
-                if discard:
-                    lang_re = lang_re[1:]
-                if lang_re == 'all':
-                    if discard:
-                        requested_langs = []
-                    else:
-                        requested_langs.extend(all_sub_langs)
-                    continue
-                current_langs = filter(re.compile(lang_re + '$').match, all_sub_langs)
-                if discard:
-                    for lang in current_langs:
-                        while lang in requested_langs:
-                            requested_langs.remove(lang)
-                else:
-                    requested_langs.extend(current_langs)
-            requested_langs = orderedSet(requested_langs)
+            try:
+                requested_langs = orderedSet_from_options(
+                    self.params.get('subtitleslangs'), {'all': all_sub_langs}, use_regex=True)
+            except re.error as e:
+                raise ValueError(f'Wrong regex for subtitlelangs: {e.pattern}')
         elif normal_sub_langs:
             requested_langs = ['en'] if 'en' in normal_sub_langs else normal_sub_langs[:1]
         else:

yt_dlp/options.py

@@ -29,6 +29,7 @@ from .utils import (
     format_field,
     get_executable_path,
     join_nonempty,
+    orderedSet_from_options,
     remove_end,
     write_string,
 )
@@ -232,30 +233,16 @@ def create_parser():
             current + value if append is True else value + current)
 
     def _set_from_options_callback(
-            option, opt_str, value, parser, delim=',', allowed_values=None, aliases={},
+            option, opt_str, value, parser, allowed_values, delim=',', aliases={},
             process=lambda x: x.lower().strip()):
-        current = set(getattr(parser.values, option.dest))
-        values = [process(value)] if delim is None else list(map(process, value.split(delim)[::-1]))
-        while values:
-            actual_val = val = values.pop()
-            if not val:
-                raise optparse.OptionValueError(f'Invalid {option.metavar} for {opt_str}: {value}')
-            if val == 'all':
-                current.update(allowed_values)
-            elif val == '-all':
-                current = set()
-            elif val in aliases:
-                values.extend(aliases[val])
-            else:
-                if val[0] == '-':
-                    val = val[1:]
-                    current.discard(val)
-                else:
-                    current.update([val])
-                if allowed_values is not None and val not in allowed_values:
-                    raise optparse.OptionValueError(f'wrong {option.metavar} for {opt_str}: {actual_val}')
+        values = [process(value)] if delim is None else map(process, value.split(delim))
+        try:
+            requested = orderedSet_from_options(values, collections.ChainMap(aliases, {'all': allowed_values}),
+                                                start=getattr(parser.values, option.dest))
+        except ValueError as e:
+            raise optparse.OptionValueError(f'wrong {option.metavar} for {opt_str}: {e.args[0]}')
 
-        setattr(parser.values, option.dest, current)
+        setattr(parser.values, option.dest, set(requested))
 
     def _dict_from_options_callback(
             option, opt_str, value, parser,
@@ -447,8 +434,8 @@ def create_parser():
                 'no-youtube-channel-redirect', 'no-youtube-unavailable-videos', 'no-attach-info-json', 'embed-metadata',
                 'embed-thumbnail-atomicparsley', 'seperate-video-versions', 'no-clean-infojson', 'no-keep-subs', 'no-certifi',
             }, 'aliases': {
-                'youtube-dl': ['-multistreams', 'all'],
-                'youtube-dlc': ['-no-youtube-channel-redirect', '-no-live-chat', 'all'],
+                'youtube-dl': ['all', '-multistreams'],
+                'youtube-dlc': ['all', '-no-youtube-channel-redirect', '-no-live-chat'],
             }
         }, help=(
             'Options that can help keep compatibility with youtube-dl or youtube-dlc '

yt_dlp/utils.py

@@ -5785,6 +5785,36 @@ def truncate_string(s, left, right=0):
     return f'{s[:left-3]}...{s[-right:]}'
 
 
+def orderedSet_from_options(options, alias_dict, *, use_regex=False, start=None):
+    assert 'all' in alias_dict, '"all" alias is required'
+    requested = list(start or [])
+    for val in options:
+        discard = val.startswith('-')
+        if discard:
+            val = val[1:]
+
+        if val in alias_dict:
+            val = alias_dict[val] if not discard else [
+                i[1:] if i.startswith('-') else f'-{i}' for i in alias_dict[val]]
+            # NB: Do not allow regex in aliases for performance
+            requested = orderedSet_from_options(val, alias_dict, start=requested)
+            continue
+
+        current = (filter(re.compile(val, re.I).fullmatch, alias_dict['all']) if use_regex
+                   else [val] if val in alias_dict['all'] else None)
+        if current is None:
+            raise ValueError(val)
+
+        if discard:
+            for item in current:
+                while item in requested:
+                    requested.remove(item)
+        else:
+            requested.extend(current)
+
+    return orderedSet(requested)
+
+
 # Deprecated
 has_certifi = bool(certifi)
 has_websockets = bool(websockets)