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