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annotate light9/ascoltami/playlist.py @ 2187:ccdfdc8183ad

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remove py2-style 'object' superclass
author drewp@bigasterisk.com
date Fri, 19 May 2023 21:14:01 -0700
parents e13b62bfdaff
children
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1 from light9.showconfig import songOnDisk
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2 from light9.namespaces import L9
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3
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4
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5 class NoSuchSong(ValueError):
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6 """Raised when a song is requested that doesn't exist (e.g. one
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7 after the last song in the playlist)."""
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10 class Playlist:
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11
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12 def __init__(self, graph, playlistUri):
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13 self.graph = graph
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14 self.playlistUri = playlistUri
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15 self.songs = list(graph.items(playlistUri))
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17 def nextSong(self, currentSong):
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18 """Returns the next song in the playlist or raises NoSuchSong if
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19 we are at the end of the playlist."""
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20 try:
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21 currentIndex = self.songs.index(currentSong)
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22 except IndexError:
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23 raise ValueError("%r is not in the current playlist (%r)." %
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24 (currentSong, self.playlistUri))
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26 try:
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27 nextSong = self.songs[currentIndex + 1]
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28 except IndexError:
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29 raise NoSuchSong("%r is the last item in the playlist." %
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30 currentSong)
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31
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32 return nextSong
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33
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34 def allSongs(self):
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35 """Returns a list of all song URIs in order."""
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36 return self.songs
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37
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38 def allSongPaths(self):
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39 """Returns a list of the filesystem paths to all songs in order."""
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40 paths = []
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41 for song in self.songs:
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42 paths.append(songOnDisk(song))
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43 return paths
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45 def songPath(self, uri):
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46 """filesystem path to a song"""
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47 raise NotImplementedError("see showconfig.songOnDisk")
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48 # maybe that function should be moved to this method
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49
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50 @classmethod
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51 def fromShow(cls, graph, show):
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52 playlistUri = graph.value(show, L9['playList'])
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53 if not playlistUri:
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54 raise ValueError("%r has no l9:playList" % show)
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55 return cls(graph, playlistUri)