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yt-dlp/yt_dlp/postprocessor/metadatafromfield.py

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from __future__ import unicode_literals
import re
from .common import PostProcessor
from ..compat import compat_str
class MetadataFromFieldPP(PostProcessor):
regex = r'(?P<in>.*?)(?<!\\):(?P<out>.+)$'
def __init__(self, downloader, formats):
PostProcessor.__init__(self, downloader)
assert isinstance(formats, (list, tuple))
self._data = []
for f in formats:
assert isinstance(f, compat_str)
match = re.match(self.regex, f)
assert match is not None
inp = match.group('in').replace('\\:', ':')
self._data.append({
'in': inp,
'out': match.group('out'),
'tmpl': self.field_to_template(inp),
'regex': self.format_to_regex(match.group('out')),
})
@staticmethod
def field_to_template(tmpl):
if re.match(r'\w+$', tmpl):
return '%%(%s)s' % tmpl
return tmpl
@staticmethod
def format_to_regex(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<%s>.+)' % match.group(1)
lastpos = match.end()
if lastpos < len(fmt):
regex += re.escape(fmt[lastpos:])
return regex
def run(self, info):
for dictn in self._data:
tmpl, tmpl_dict = self._downloader.prepare_outtmpl(dictn['tmpl'], info)
data_to_parse = tmpl % tmpl_dict
self.write_debug('Searching for r"%s" in %s' % (dictn['regex'], dictn['tmpl']))
match = re.search(dictn['regex'], data_to_parse)
if match is None:
self.report_warning('Could not interpret video %s as "%s"' % (dictn['in'], dictn['out']))
continue
for attribute, value in match.groupdict().items():
info[attribute] = value
self.to_screen('parsed %s from "%s": %s' % (attribute, dictn['in'], 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:%s' % titleformat])
self._titleformat = titleformat
self._titleregex = self._data[0]['regex']