sima/lib/meta.py

   1 # -*- coding: utf-8 -*-
   2
   3 from .simastr import SimaStr
   4 from .track import Track
   5
   6 class MetaException(Exception):
   7     pass
   8
   9 class NotSameArtist(MetaException):
  10     pass
  11
  12
  13 class Meta:
  14
  15     def __init__(self, **kwargs):
  16         self.name = None
  17         self.mbid = None
  18         if 'name' not in kwargs:
  19             raise MetaException('need at least a "name" argument')
  20         self.__dict__.update(kwargs)
  21
  22     def __repr__(self):
  23         fmt = '{0}(name="{1.name}", mbid="{1.mbid}")'
  24         return fmt.format(self.__class__.__name__, self)
  25
  26     def __str__(self):
  27         return str(self.name)
  28
  29     def __eq__(self, other):
  30         """
  31         Perform mbid equality test if present,
  32         else fallback on fuzzy equality
  33         """
  34         if hasattr(other, 'mbid'):
  35             if other.mbid and self.mbid:
  36                 return self.mbid == other.mbid
  37         return SimaStr(str(self)) == SimaStr(str(other))
  38
  39     def __hash__(self):
  40         if self.mbid is not None:
  41             return hash(self.mbid)
  42         else:
  43             return id(self)
  44
  45
  46 class Album(Meta):
  47     __hash__ = Meta.__hash__
  48
  49     def __init__(self, **kwargs):
  50         super().__init__(**kwargs)
  51
  52     def __eq__(self, other):
  53         """
  54         Perform mbid equality test if present,
  55         else fallback on self.name equality
  56         """
  57         if hasattr(other, 'mbid'):
  58             if other.mbid and self.mbid:
  59                 return self.mbid == other.mbid
  60         return str(self) == str(other)
  61
  62     @property
  63     def album(self):
  64         return self.name
  65
  66
  67 class Artist(Meta):
  68
  69     def __init__(self, **kwargs):
  70         self._aliases = []
  71         super().__init__(**kwargs)
  72
  73     def append(self, name):
  74         self._aliases.append(name)
  75
  76     @property
  77     def names(self):
  78         return self._aliases + [self.name]
  79
  80     def __add__(self, other):
  81         if isinstance(other, Artist):
  82             if self.mbid == other.mbid:
  83                 res = Artist(**self.__dict__)
  84                 res._aliases.extend(other.names)
  85                 return res
  86             else:
  87                 raise NotSameArtist('different mbids: {0} and {1}'.format(self, other))
  88
  89
  90 class TrackMB(Track):
  91
  92     def __init__(self, **kwargs):
  93         super().__init__(**kwargs)
  94         if hasattr(self, 'musicbrainz_artistid'):
  95             self.artist = Artist(mbid=self.musicbrainz_artistid,
  96                                  name=self.artist)
  97
  98 # vim: ai ts=4 sw=4 sts=4 expandtab
  99