[YoutubeDL] Raise syntax error for format selection expressions with multiple + operators (closes #27803)

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Sergey M․ 2021-01-14 00:37:51 +07:00
commit d81a213cfb
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@ -1226,6 +1226,8 @@ class YoutubeDL(object):
group = _parse_format_selection(tokens, inside_group=True)
current_selector = FormatSelector(GROUP, group, [])
elif string == '+':
if inside_merge:
raise syntax_error('Unexpected "+"', start)
video_selector = current_selector
audio_selector = _parse_format_selection(tokens, inside_merge=True)
if not video_selector or not audio_selector: