X-Git-Url: https://git.kaliko.me/?a=blobdiff_plain;f=sima%2Flib%2Fmeta.py;h=069a904c8ec587079fcc13bbf3ef002c791d7961;hb=888614f7afac2b23fb473d209c54dcb69216b165;hp=a3efbf55fe68805e133b9ff32cdcc562791cf231;hpb=766b97a00129b73970d998976ee952f913130d68;p=mpd-sima.git diff --git a/sima/lib/meta.py b/sima/lib/meta.py index a3efbf5..069a904 100644 --- a/sima/lib/meta.py +++ b/sima/lib/meta.py @@ -1,5 +1,5 @@ # -*- coding: utf-8 -*- -# Copyright (c) 2013, 2014 Jack Kaliko +# Copyright (c) 2013, 2014, 2015 Jack Kaliko # # This file is part of sima # @@ -21,92 +21,204 @@ Defines some object to handle audio file metadata """ -from .simastr import SimaStr +try: + from collections.abc import Set # python >= 3.3 +except ImportError: + from collections import Set # python 3.2 +import logging +import re + +UUID_RE = r'^[a-f0-9]{8}-[a-f0-9]{4}-4[a-f0-9]{3}-[89aAbB][a-f0-9]{3}-[a-f0-9]{12}$' +# The Track Object is collapsing multiple tags into a single string using this +# separator. It is used then to split back the string to tags list. +SEPARATOR = chr(0x1F) # ASCII Unit Separator + +def is_uuid4(uuid): + """Controls MusicBrainz UUID4 format + + :param str uuid: String representing the UUID + :returns: boolean + """ + regexp = re.compile(UUID_RE, re.IGNORECASE) + if regexp.match(uuid): + return True + return False class MetaException(Exception): """Generic Meta Exception""" pass -class NotSameArtist(MetaException): - pass +def mbidfilter(func): + def wrapper(*args, **kwargs): + cls = args[0] + if not cls.use_mbid: + kwargs.pop('mbid', None) + kwargs.pop('musicbrainz_artistid', None) + kwargs.pop('musicbrainz_albumartistid', None) + func(*args, **kwargs) + return wrapper class Meta: - """Generic Class for Meta object""" + """ + A generic Class to handle tracks metadata such as artist, album, albumartist + names and their associated MusicBrainz's ID. + + + Using generic kwargs in constructor for convenience but the actual signature is: + + >>> Meta(name, mbid=None, **kwargs) + + :param str name: set name attribute + :param str mbid: set MusicBrainz ID + """ + use_mbid = True + """Class attribute to disable use of MusicBrainz IDs""" def __init__(self, **kwargs): - self.name = None - self.mbid = None - if 'name' not in kwargs: - raise MetaException('need at least a "name" argument') - self.__dict__.update(kwargs) + """Meta(name=[, mbid=UUID4])""" + self.__name = None #TODO: should be immutable + self.__mbid = None + self.__aliases = set() + self.log = logging.getLogger(__name__) + if 'name' not in kwargs or not kwargs.get('name'): + raise MetaException('Need a "name" argument') + else: + self.__name = kwargs.pop('name') + if 'mbid' in kwargs and kwargs.get('mbid'): + if is_uuid4(kwargs.get('mbid')): + self.__mbid = kwargs.pop('mbid').lower() + else: + self.log.warning('Wrong mbid %s:%s', self.__name, + kwargs.get('mbid')) + # mbid immutable as hash rests on + self.__dict__.update(**kwargs) def __repr__(self): - fmt = '{0}(name="{1.name}", mbid="{1.mbid}")' + fmt = '{0}(name={1.name!r}, mbid={1.mbid!r})' return fmt.format(self.__class__.__name__, self) def __str__(self): - return str(self.name) + return self.__name.__str__() def __eq__(self, other): """ - Perform mbid equality test if present, - else fallback on fuzzy equality + Perform mbid equality test """ - if hasattr(other, 'mbid'): - if other.mbid and self.mbid: - return self.mbid == other.mbid - return SimaStr(str(self)) == SimaStr(str(other)) + #if hasattr(other, 'mbid'): # better isinstance? + if isinstance(other, Meta) and self.mbid and other.mbid: + return self.mbid == other.mbid + elif isinstance(other, Meta): + return bool(self.names & other.names) + elif getattr(other, '__str__', None): + # is other.__str__() in self.__name or self.__aliases + return other.__str__() in self.names + return False def __hash__(self): - if self.mbid is not None: + if self.mbid: return hash(self.mbid) + return hash(self.__name) + + def add_alias(self, other): + """Add alternative name to `aliases` attibute. + + `other` can be a :class:`sima.lib.meta.Meta` object in which case aliases are merged. + + :param str other: Alias to add, could be any object with ``__str__`` method. + """ + if getattr(other, '__str__', None): + if callable(other.__str__) and other.__str__() != self.name: + self.__aliases |= {other.__str__()} + elif isinstance(other, Meta): + if other.name != self.name: + self.__aliases |= other.__aliases else: - return id(self) + raise MetaException('No __str__ method found in {!r}'.format(other)) + @property + def name(self): + return self.__name -class Album(Meta): - __hash__ = Meta.__hash__ + @property + def mbid(self): + return self.__mbid - def __init__(self, **kwargs): - super().__init__(**kwargs) + @property + def aliases(self): + return self.__aliases - def __eq__(self, other): - """ - Perform mbid equality test if present, - else fallback on self.name equality - """ - if hasattr(other, 'mbid'): - if other.mbid and self.mbid: - return self.mbid == other.mbid - return str(self) == str(other) + @property + def names(self): + """aliases + name""" + return self.__aliases | {self.__name,} + + +class Album(Meta): + """Album object""" @property def album(self): return self.name - class Artist(Meta): + """Artist object deriving from :class:`Meta`. + + :param str name: Artist name + :param str mbid: Musicbrainz artist ID + :param str artist: Overrides "name" argument + :param str albumartist: Overrides "name" and "artist" argument + :param str musicbrainz_artistid: Overrides "mbid" argument + :param str musicbrainz_albumartistid: Overrides "musicbrainz_artistid" argument + + :Example: + + >>> trk = {'artist':'Art Name', + >>> 'albumartist': 'Alb Art Name', # optional + >>> 'musicbrainz_artistid': '', # optional + >>> 'musicbrainz_albumartistid': '', # optional + >>> } + >>> artobj0 = Artist(**trk) + >>> artobj1 = Artist(name='Tool') + """ + + @mbidfilter + def __init__(self, name=None, mbid=None, **kwargs): + if kwargs.get('artist', False): + name = kwargs.get('artist').split(SEPARATOR)[0] + if kwargs.get('musicbrainz_artistid', False): + mbid = kwargs.get('musicbrainz_artistid').split(SEPARATOR)[0] + if (kwargs.get('albumartist', False) and + kwargs.get('albumartist') != 'Various Artists'): + name = kwargs.get('albumartist').split(SEPARATOR)[0] + if (kwargs.get('musicbrainz_albumartistid', False) and + kwargs.get('musicbrainz_albumartistid') != '89ad4ac3-39f7-470e-963a-56509c546377'): + mbid = kwargs.get('musicbrainz_albumartistid').split(SEPARATOR)[0] + super().__init__(name=name, mbid=mbid) + +class MetaContainer(Set): + + def __init__(self, iterable): + self.elements = lst = [] + for value in iterable: + if value not in lst: + lst.append(value) + else: + for inlst in lst: + if value == inlst: + inlst.add_alias(value) - def __init__(self, **kwargs): - self._aliases = [] - super().__init__(**kwargs) + def __iter__(self): + return iter(self.elements) - def append(self, name): - self._aliases.append(name) + def __contains__(self, value): + return value in self.elements - @property - def names(self): - return self._aliases + [self.name] - - def __add__(self, other): - if isinstance(other, Artist): - if self.mbid == other.mbid: - res = Artist(**self.__dict__) - res._aliases.extend(other.names) - return res - else: - raise NotSameArtist('different mbids: {0} and {1}'.format(self, other)) + def __len__(self): + return len(self.elements) -# vim: ai ts=4 sw=4 sts=4 expandtab + def __repr__(self): + return repr(self.elements) +# VIM MODLINE +# vim: ai ts=4 sw=4 sts=4 expandtab