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import sys
def printf(fmt, *args):
sys.stdout.write(fmt % args)
class Track:
def __init__(self, number, datatype):
try:
self.number = int(number)
except ValueError:
raise InvalidCommand("invalid number \"%s\"" % number)
self.datatype = datatype
self.indexes = []
self.performer = ""
self.title = ""
def get_number():
return self.number
class File:
def __init__(self, name, filetype):
self.name = name
self.filetype = filetype
self.tracks = []
def __repr__(self):
return self.name
def get_type(self):
return self.filetype
class Cue:
def __init__(self):
self.performer = ""
self.title = ""
self.tracks = []
self.files = []
def get_tracks(self):
return self.tracks
class CueParserError(Exception):
pass
class UnknownCommand(CueParserError):
pass
class InvalidCommand(CueParserError):
pass
class InvalidContext(CueParserError):
pass
def check_argc(count):
def deco(func):
def method(cls, *lst):
n = len(lst)
if n != count:
raise InvalidCommand("%d args expected, got %d" % (count, n))
func(cls, *lst)
return method
return deco
class CueParser:
(
GENERAL,
TRACK
FILE,
) = range(3)
def __init__(self, msg):
self.cue = Cue()
self.context = self.GENERAL
self.commands = {
"file": self.parse_file,
"track": self.parse_track,
"index": self.parse_index,
"title": self.parse_title,
"performer": self.parse_performer,
"flags": self.parse_flags
}
self.msg = msg
@staticmethod
def split_args(args):
lst = []
quote = None
cur = []
def push():
lst.append("".join(cur))
cur[:] = []
for ch in args:
if quote:
if ch != quote:
cur.append(ch)
else:
quote = None
elif ch.isspace():
if cur:
push()
elif ch in ("\"", "'"):
quote = ch
else:
cur.append(ch)
if quote:
raise CueParserError("unclosed quote '%s'" % quote)
if cur:
push()
return lst
def get_cue():
return cue
@check_argc(2)
def parse_file(self, *args):
self.last_file = File(*args)
self.cue.files.append(self.last_file)
self.context = self.FILE
@check_argc(2)
def parse_track(self, *args):
if self.context != self.FILE:
raise InvalidContext
self.last_track = Track(*args)
self.cue.tracks.append(self.last_track)
self.last_file.tracks.append(self.last_track)
self.context = self.TRACK
def set_prop(self, attr, value, opt):
obj = opt.get(self.context)
if obj is None:
raise InvalidContext
if getattr(obj, attr):
raise InvalidCommand("duplicate")
setattr(obj, attr, value)
@check_argc(1):
def parse_title(self, title):
self.set_prop("title", title, {
self.GENERAL: self.cue,
self.TRACK: self.last_track
})
@check_argc(1)
def parse_performer(self, performer):
self.set_prop("performer", performer, {
self.GENERAL: self.cue,
self.TRACK: self.last_track
})
def parse_flags(self, *flags):
if self.context != self.TRACK:
raise InvalidContext
if self.last_track.indexes:
raise InvalidCommand("must appear before any INDEX commands")
def parse_default(self, args):
raise UnknownCommand
def parse(self, cmd, arg):
self.commands.get(cmd.lower(), parse_default)(*self.split_args(arg))
def read_cuesheet(filename):
def msg(fmt, args):
printf("read_cuesheet %s:%d: ", filename, nline)
printf(fmt, args)
if not fmt.endswith("\n"):
printf("\n")
fp = open(filename)
parser = CueParser(msg)
nline = 0
for line in fp.readlines():
nline = nline + 1
s = line.strip()
if not len(s):
continue
data = s.split(None, 1)
if len(data) is 1:
msg("arg missed")
continue
try:
parser.parse(*data)
except UnknownCommand:
msg("unknown command \"%s\"", data[0])
except InvalidContext:
msg("invalid context for command \"%s\"", data[0])
except InvalidCommand as err:
msg("invalid command \"%s\": %s", data[0], err)
except CueParserError as err:
msg("%s", err)
fp.close()
return parser.get_cue()
|
