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yt-dlp/youtube_dlc/postprocessor/metadatafromfield.py

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from __future__ import unicode_literals
import re
from .common import PostProcessor
from ..compat import compat_str
from ..utils import str_or_none
class MetadataFromFieldPP(PostProcessor):
regex = r'(?P<field>\w+):(?P<format>.+)$'
def __init__(self, downloader, formats):
PostProcessor.__init__(self, downloader)
assert isinstance(formats, (list, tuple))
self._data = []
for f in formats:
assert isinstance(f, compat_str)
match = re.match(self.regex, f)
assert match is not None
self._data.append({
'field': match.group('field'),
'format': match.group('format'),
'regex': self.format_to_regex(match.group('format'))})
def format_to_regex(self, fmt):
r"""
Converts a string like
'%(title)s - %(artist)s'
to a regex like
'(?P<title>.+)\ \-\ (?P<artist>.+)'
"""
if not re.search(r'%\(\w+\)s', fmt):
return fmt
lastpos = 0
regex = ''
# replace %(..)s with regex group and escape other string parts
for match in re.finditer(r'%\((\w+)\)s', fmt):
regex += re.escape(fmt[lastpos:match.start()])
regex += r'(?P<' + match.group(1) + r'>[^\r\n]+)'
lastpos = match.end()
if lastpos < len(fmt):
regex += re.escape(fmt[lastpos:])
return regex
def run(self, info):
for dictn in self._data:
field, regex = dictn['field'], dictn['regex']
if field not in info:
self.report_warning('Video doesnot have a %s' % field)
continue
data_to_parse = str_or_none(info[field])
if data_to_parse is None:
self.report_warning('Field %s cannot be parsed' % field)
continue
self.write_debug('Searching for r"%s" in %s' % (regex, field))
match = re.search(regex, data_to_parse)
if match is None:
self.report_warning('Could not interpret video %s as "%s"' % (field, dictn['format']))
continue
for attribute, value in match.groupdict().items():
info[attribute] = value
self.to_screen('parsed %s from %s: %s' % (attribute, field, value if value is not None else 'NA'))
return [], info
class MetadataFromTitlePP(MetadataFromFieldPP): # for backward compatibility
def __init__(self, downloader, titleformat):
super(MetadataFromTitlePP, self).__init__(downloader, ['title:%s' % titleformat])
self._titleformat = titleformat
self._titleregex = self._data[0]['regex']