118 lines
4.1 KiB
Python
118 lines
4.1 KiB
Python
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import re
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from enum import Enum
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from .common import PostProcessor
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class MetadataParserPP(PostProcessor):
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class Actions(Enum):
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INTERPRET = 'interpretter'
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REPLACE = 'replacer'
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def __init__(self, downloader, actions):
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PostProcessor.__init__(self, downloader)
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self._actions = []
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for f in actions:
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action = f[0]
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assert isinstance(action, self.Actions)
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self._actions.append(getattr(self, action._value_)(*f[1:]))
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@classmethod
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def validate_action(cls, action, *data):
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''' Each action can be:
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(Actions.INTERPRET, from, to) OR
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(Actions.REPLACE, field, search, replace)
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'''
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if not isinstance(action, cls.Actions):
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raise ValueError(f'{action!r} is not a valid action')
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getattr(cls, action._value_)(cls, *data)
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@staticmethod
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def field_to_template(tmpl):
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if re.match(r'[a-zA-Z_]+$', tmpl):
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return f'%({tmpl})s'
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return tmpl
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@staticmethod
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def format_to_regex(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 += rf'(?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:])
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return regex
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def run(self, info):
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for f in self._actions:
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f(info)
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return [], info
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def interpretter(self, inp, out):
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def f(info):
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outtmpl, tmpl_dict = self._downloader.prepare_outtmpl(template, info)
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data_to_parse = self._downloader.escape_outtmpl(outtmpl) % tmpl_dict
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self.write_debug(f'Searching for r{out_re.pattern!r} in {template!r}')
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match = out_re.search(data_to_parse)
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if match is None:
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self.report_warning('Could not interpret {inp!r} as {out!r}')
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return
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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 %r: %r' % (attribute, template, value if value is not None else 'NA'))
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template = self.field_to_template(inp)
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out_re = re.compile(self.format_to_regex(out))
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return f
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def replacer(self, field, search, replace):
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def f(info):
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val = info.get(field)
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if val is None:
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self.report_warning(f'Video does not have a {field}')
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return
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elif not isinstance(val, str):
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self.report_warning(f'Cannot replace in field {field} since it is a {type(val).__name__}')
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return
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self.write_debug(f'Replacing all r{search!r} in {field} with {replace!r}')
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info[field], n = search_re.subn(replace, val)
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if n:
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self.to_screen(f'Changed {field} to: {info[field]}')
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else:
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self.to_screen(f'Did not find r{search!r} in {field}')
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search_re = re.compile(search)
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return f
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class MetadataFromFieldPP(MetadataParserPP):
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@classmethod
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def to_action(cls, f):
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match = re.match(r'(?P<in>.*?)(?<!\\):(?P<out>.+)$', f)
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if match is None:
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raise ValueError(f'it should be FROM:TO, not {f!r}')
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return (
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cls.Actions.INTERPRET,
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match.group('in').replace('\\:', ':'),
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match.group('out'))
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def __init__(self, downloader, formats):
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MetadataParserPP.__init__(self, downloader, [self.to_action(f) for f in formats])
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class MetadataFromTitlePP(MetadataParserPP): # for backward compatibility
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def __init__(self, downloader, titleformat):
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MetadataParserPP.__init__(self, downloader, [(self.Actions.INTERPRET, 'title', titleformat)])
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