Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/monstercat.py (Python)

Code before:
    strip_or_none,
    traverse_obj,
)


class MonstercatIE(InfoExtractor):
    _VALID_URL = r'https://www\.monstercat\.com/release/(?P<id>\d+)'
    _TESTS = [{
        'url': 'https://www.monstercat.com/release/742779548009',
        'playlist_count': 20,
        'info_dict': {
            'title': 'The Secret Language of Trees',
            'id': '742779548009',
            'thumbnail': 'https://www.monstercat.com/release/742779548009/cover',
            'release_year': 2023,
            'release_date': '20230711',
            'album': 'The Secret Language of Trees',
            'album_artist': 'BT',
        }
    }]

    TRACK_API = 'https://www.monstercat.com/api/release/{release_id}/track-stream/{song_id}'

    def _extract_tracks(self, table, album_meta):
        for td in re.findall(r'<tr[^<]*>((?:(?!</tr>)[\w\W])+)', table):  # regex by chatgpt due to lack of get_elements_by_tag
            title = traverse_obj(get_element_by_class('d-inline-flex flex-column', td).partition(' <span'), (0, {strip_or_none}))
            ids = traverse_obj(get_element_html_by_class('btn-play cursor-pointer mr-small', td), {extract_attributes})
            yield {
                **album_meta,
                'title': title,
                'track': title,
                'track_number': traverse_obj(get_element_by_class('py-xsmall', td), {int_or_none}),
                'artist': traverse_obj(td, {lambda td: get_element_by_class('d-block fs-xxsmall', td)}),
                'url': self.TRACK_API.format(release_id=ids.get('data-release-id'),
                                             song_id=ids.get('data-track-id')),
                'id': ids.get('data-track-id'),
                'ext': 'mp3'
            }

    def _real_extract(self, url):
        url_id = self._match_id(url)
        html = self._download_webpage(url, url_id)
        tracklist_table = traverse_obj(html, {lambda html: get_element_by_class('table table-small', html)})

        title = traverse_obj(get_element_text_and_html_by_tag('h1', html), 0)
        date = traverse_obj(html, ({lambda html: get_element_by_class('font-italic mb-medium d-tablet-none d-phone-block',
                            html).partition('Released ')}, 2, {strip_or_none}, {unified_strdate}))

        album_meta = {
            'title': title,
            'album': title,

Review comment (suggestion):
objects passed to `traverse_obj` can still be fatal. `{transformations}` are wrapped in `try_call`, which IMO is what we should use instead when traversal serves no other purpose

also, for the string values IMO we should also call `clean_html` just in case (it takes care of the strip too)
```suggestion
            title = clean_html(try_call(
                lambda: get_element_by_class('d-inline-flex flex-column', td).partition(' <span')[0]))
```

Code after:
    unified_strdate,
    strip_or_none,
    traverse_obj,
    try_call,
)


class MonstercatIE(InfoExtractor):
    _VALID_URL = r'https://www\.monstercat\.com/release/(?P<id>\d+)'
    _TESTS = [{
        'url': 'https://www.monstercat.com/release/742779548009',
        'playlist_count': 20,
        'info_dict': {
            'title': 'The Secret Language of Trees',
            'id': '742779548009',
            'thumbnail': 'https://www.monstercat.com/release/742779548009/cover',
            'release_year': 2023,
            'release_date': '20230711',
            'album': 'The Secret Language of Trees',
            'album_artist': 'BT',
        }
    }]

    def _extract_tracks(self, table, album_meta):
        for td in re.findall(r'<tr[^<]*>((?:(?!</tr>)[\w\W])+)', table):  # regex by chatgpt due to lack of get_elements_by_tag
            title = clean_html(try_call(
                lambda: get_element_by_class('d-inline-flex flex-column', td).partition(' <span')[0]))
            ids = extract_attributes(try_call(lambda: get_element_html_by_class('btn-play cursor-pointer mr-small', td)) or '')
            track_id = ids.get('data-track-id')
            release_id = ids.get('data-release-id')

            track_number = int_or_none(try_call(lambda: get_element_by_class('py-xsmall', td)))
            if not track_id or not release_id:
                self.report_warning(f'Skipping track {track_number}, ID(s) not found')
                self.write_debug(f'release_id={repr(release_id)} track_id={repr(track_id)}')
                continue
            yield {
                **album_meta,
                'title': title,
                'track': title,
                'track_number': track_number,
                'artist': clean_html(try_call(lambda: get_element_by_class('d-block fs-xxsmall', td))),
                'url': f'https://www.monstercat.com/api/release/{release_id}/track-stream/{track_id}',
                'id': track_id,
                'ext': 'mp3'
            }

    def _real_extract(self, url):
        url_id = self._match_id(url)
        html = self._download_webpage(url, url_id)
        # wrap all `get_elements` in `try_call`, HTMLParser has problems with site's html