Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/rule34video.py (Python)

Code before:
import re

from ..utils import parse_duration, unescapeHTML
from .common import InfoExtractor


class Rule34VideoIE(InfoExtractor):
    _VALID_URL = r'https?://(?:www\.)?rule34video\.com/videos/(?P<id>\d+)'
    _TESTS = [
        {
            'url': 'https://rule34video.com/videos/3065157/shot-it-mmd-hmv/',
            'md5': 'ffccac2c23799dabbd192621ae4d04f3',
            'info_dict': {
                'id': '3065157',
                'ext': 'mp4',
                'title': 'Shot It-(mmd hmv)',
                'thumbnail': 'https://rule34video.com/contents/videos_screenshots/3065000/3065157/preview.jpg',
                'duration': 347.0,
                'age_limit': 18,
                'tags': 'count:14'
            }
        },
        {
            'url': 'https://rule34video.com/videos/3065296/lara-in-trouble-ep-7-wildeerstudio/',
            'md5': '6bb5169f9f6b38cd70882bf2e64f6b86',
            'info_dict': {
                'id': '3065296',
                'ext': 'mp4',
                'title': 'Lara in Trouble Ep. 7 [WildeerStudio]',
                'thumbnail': 'https://rule34video.com/contents/videos_screenshots/3065000/3065296/preview.jpg',
                'duration': 938.0,
                'age_limit': 18,
                'tags': 'count:50'
            }
        },
    ]

    def _real_extract(self, url):
        video_id = self._match_id(url)
        webpage = self._download_webpage(url, video_id)

        formats = []

        for mobj in re.finditer(r'<a[^>]+href="(?P<video_url>[^"]+download=true[^"]+)".*>(?P<ext>[^\s]+) (?P<quality>[^<]+)p</a>', webpage):
            url, ext, quality = mobj.groups()
            formats.append({
                'url': url,
                'ext': ext.lower(),
                'quality': quality,
            })

        title = self._html_extract_title(webpage)
        thumbnail = self._html_search_regex(r'preview_url:\s+\'([^\']+)\'', webpage, 'thumbnail', default=None)
        duration = self._html_search_regex(r'"icon-clock"></i>\s+<span>((?:\d+:?)+)', webpage, 'duration', default=None)

        return {
            'id': video_id,
            'formats': formats,
            'title': title,
            'thumbnail': thumbnail,
            'duration': parse_duration(duration),
            'age_limit': 18,
            'tags': list(map(unescapeHTML, re.findall(
                r'<a class="tag_item"[^>]+\bhref="https://rule34video\.com/tags/\d+/"[^>]*>(?P<tag>[^>]*)</a>', webpage))),
        }


Review comment (refactor):
You can get the description from the JSON-LD:
```python
json_ld = self._search_json_ld(webpage, video_id, default={})
description = json_ld.get('description')
```
Though the description should be inlined in the returned info dict.
There are also a couple other variables that can be extracted here. I think they should be extracted as backup values.
<!--
On that note there are also a fair number of variables availble in the flashvars:
```python
flash_vars = self._search_json(r'var\s+flashvars\s*=', webpage, 'flashvars',
                               video_id, transform_source=js_to_json, default={})
```
-->

Code after:

    def _real_extract(self, url):
        video_id = self._match_id(url)
        webpage = self._download_webpage(url, video_id)

        formats = []

        for mobj in re.finditer(r'<a[^>]+href="(?P<video_url>[^"]+download=true[^"]+)".*>(?P<ext>[^\s]+) (?P<quality>[^<]+)p</a>', webpage):
            url, ext, quality = mobj.groups()
            formats.append({
                'url': url,
                'ext': ext.lower(),
                'quality': quality,
            })

        categories, creator, uploader, uploader_url = [None] * 4
        for col in get_elements_by_class('col', webpage):
            label = clean_html(get_element_by_class('label', col))
            if label == 'Categories:':
                categories = list(map(clean_html, get_elements_by_class('item', col)))
            elif label == 'Artist:':
                creator = join_nonempty(*map(clean_html, get_elements_by_class('item', col)), delim=', ')
            elif label == 'Uploaded By:':
                uploader = clean_html(get_element_by_class('name', col))
                uploader_url = extract_attributes(get_element_html_by_class('name', col) or '').get('href')

        return {
            **traverse_obj(self._search_json_ld(webpage, video_id, default={}), ({
                'title': 'title',
                'view_count': 'view_count',
                'like_count': 'like_count',
                'duration': 'duration',
                'timestamp': 'timestamp',
                'description': 'description',
                'thumbnail': ('thumbnails', 0, 'url'),
            })),
            'id': video_id,
            'formats': formats,
            'title': self._html_extract_title(webpage),
            'thumbnail': self._html_search_regex(
                r'preview_url:\s+\'([^\']+)\'', webpage, 'thumbnail', default=None),
            'duration': parse_duration(self._html_search_regex(
                r'"icon-clock"></i>\s+<span>((?:\d+:?)+)', webpage, 'duration', default=None)),
            'view_count': int_or_none(self._html_search_regex(
                r'"icon-eye"></i>\s+<span>([ \d]+)', webpage, 'views', default='').replace(' ', '')),
            'like_count': parse_count(get_element_by_class('voters count', webpage)),
            'comment_count': int_or_none(self._search_regex(
                r'[^(]+\((\d+)\)', get_element_by_attribute('href', '#tab_comments', webpage), 'comment count', fatal=False)),
            'age_limit': 18,
            'creator': creator,
            'uploader': uploader,