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47 lines
1.5 KiB
Python
47 lines
1.5 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 ..utils import PostProcessingError
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class MetadataFromTitlePPError(PostProcessingError):
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pass
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class MetadataFromTitlePP(PostProcessor):
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def __init__(self, downloader, titleformat):
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super(MetadataFromTitlePP, self).__init__(downloader)
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self._titleformat = titleformat
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self._titleregex = self.format_to_regex(titleformat)
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def format_to_regex(self, fmt):
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"""
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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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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) + '>.+)'
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lastpos = match.end()
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if lastpos < len(fmt):
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regex += re.escape(fmt[lastpos:len(fmt)])
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return regex
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def run(self, info):
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title = info['title']
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match = re.match(self._titleregex, title)
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if match is None:
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raise MetadataFromTitlePPError('Could not interpret title of video as "%s"' % self._titleformat)
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for attribute, value in match.groupdict().items():
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value = match.group(attribute)
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info[attribute] = value
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self._downloader.to_screen('[fromtitle] parsed ' + attribute + ': ' + value)
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return [], info
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