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taggr.py
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taggr.py
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# vim: ts=4 sw=4 et:
import re
from os.path import sep
class Subster(object):
def __init__(self,pattern='',mode='' ) :
self.pattern = pattern or ''
if mode == 'tag2fn':
self.tag2fn = pattern or ''
elif mode == 'fn2tag':
self.fn2tag = pattern or ''
self.mode = mode
self.keydict = { 'a':'artist',
'l':'album',
'n':'tracknumber',
't':'title',
'd':'date',
'g':'genre',
'c':'composer',
'j':'junk',
'i':'discnumber' }
keystr = ''.join( self.keydict.keys( ) )
keypat = '%['+ keystr +']'
keypat = re.compile( keypat )
# self.keys = re.findall( keypat,self.pattern )
self.keys = [mp[1] for mp in re.findall(keypat,self.pattern)]
self.lits = re.split( keypat,self.pattern )
# print self.keys
# print self.lits
def pathstrip( self, ptn, pth ) :
n=len( ptn.strip(sep).split(sep) )
pthlist=pth.strip(sep).split(sep)[-n:]
return sep.join( pthlist )
def _get_regex( self, reg, lit ) :
if reg == 'n' :
return ( '[0-9]+?'+lit )
else:
return ( '.+?'+lit )
def init( self ) :
self.keyiter = iter( self.keys )
self.literals = iter( self.lits )
if self.lits[0] == '':
literal = self.literals.next( )
try:
self.fname = self.fname[ len(literal): ]
except AttributeError:
pass
except ValueError:
raise ValueError
def nextpair( self ) :
try :
key = self.keyiter.next( )
except StopIteration :
raise StopIteration
try:
lit = self.literals.next( )
except StopIteration :
lit = ''
matchpat = self._get_regex( key, lit )
mo = re.match( matchpat, self.fname )
if mo:
val = mo.group( )[ : -len( lit ) ]
self.fname = self.fname[ len( lit+val ): ]
keyname = self.keydict[ key ]
return {keyname:val}
else:
raise ValueError
def getdict( self,fname ):
self.fname = self.pathstrip( self.pattern,fname )
try:
self.init( )
except ValueError:
return { }
gdict = { }
while True:
try:
gdict.update( self.nextpair( ) )
except ValueError:
return { }
except StopIteration:
break
return gdict
def getfnlist( self ):
fnlist = []
self.keyiter = iter( self.keys )
self.literals = iter( self.lits )
while True:
try:
fnlist.append( self.literals.next( ))
fnlist.append( self.keydict[self.keyiter.next( )].lower( ) )
except StopIteration:
break
return fnlist