root/trunk/libffado/support/mixer-qt4/ffado_configuration.py

Revision 1583, 4.5 kB (checked in by ppalmers, 15 years ago)

fix regression introduced by r1577

Line 
1 #!/usr/bin/python
2 #
3 # Copyright (C) 2008 by Arnold Krille
4 #
5 # This file is part of FFADO
6 # FFADO = Free Firewire (pro-)audio drivers for linux
7 #
8 # FFADO is based upon FreeBoB.
9 #
10 # This program is free software: you can redistribute it and/or modify
11 # it under the terms of the GNU General Public License as published by
12 # the Free Software Foundation, either version 3 of the License, or
13 # (at your option) any later version.
14 #
15 # This program is distributed in the hope that it will be useful,
16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18 # GNU General Public License for more details.
19 #
20 # You should have received a copy of the GNU General Public License
21 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
22 #
23
24 import re, os
25
26 import shlex
27
28 import logging
29 log = logging.getLogger('configparser')
30
31 class DeviceList:
32         def __init__( self, filename="" ):
33                 self.devices = list()
34                 if not filename == "":
35                         self.updateFromFile( filename )
36
37         def updateFromFile( self, filename, must_exist=False):
38                 filename = os.path.expanduser(filename)
39                 log.debug("DeviceList::updateFromFile(%s)" % filename)
40                 if not os.path.exists( filename ):
41                         if must_exist:
42                                 log.error("cannot open file")
43                         return
44                 f = open( filename, "r" )
45
46                 lex = Parser( f )
47                 config = {}
48                 while lex.peaktoken() != lex.eof:
49                         tmp = lex.parsenamedvalue()
50                         if tmp != None:
51                                 config[ tmp[0] ] = tmp[1]
52                 for dev in config["device_definitions"]:
53                         self.addDevice( dev )
54
55         def getDeviceById( self, vendor, model ):
56                 log.debug("DeviceList::getDeviceById( %s, %s )" % (vendor, model ))
57                 for dev in self.devices:
58                         if int("%s" % dev['vendorid'], 0) == int("%s" % vendor, 0) and \
59                            int("%s" % dev['modelid'], 0) == int("%s" % model, 0):
60                                 return dev
61                 tmp = dict()
62                 self.devices.append( tmp )
63                 return tmp
64
65         def addDevice( self, device_dict ):
66                 log.debug("DeviceList::addDevice()")
67                 dev = self.getDeviceById( device_dict['vendorid'], device_dict['modelid'] )
68                 dev.update( device_dict )
69
70 class Parser:
71         def __init__( self, file ):
72                 self.lex = shlex.shlex( file )
73                 self.eof = self.lex.eof
74
75         def peaktoken( self ):
76                 token = self.lex.get_token()
77                 self.lex.push_token( token )
78                 return token
79
80         def parselist( self, level="" ):
81                 token = self.peaktoken()
82                 if token != "(":
83                         return
84                 self.lex.get_token()
85                 log.debug("%sWill parse list" % level)
86                 ret = []
87                 token = self.peaktoken()
88                 while token != ")":
89                         ret.append( self.parsenamedvalue( level+"  " ) )
90                         token = self.peaktoken()
91                 log.debug("%slist is %s" % (level, str(ret)))
92                 self.lex.get_token()
93                 if self.peaktoken() == ",":
94                         log.debug("%sFound a delimiter" % level)
95                         self.lex.get_token()
96                 return ret
97
98         def parsemap( self, level="" ):
99                 token = self.lex.get_token()
100                 if token != "{":
101                         return
102                 log.debug("%sWill parse map" % level)
103                 ret = {}
104                 token = self.peaktoken()
105                 while token != "}":
106                         #self.push_token( token )
107                         tmp = self.parsenamedvalue( level+"  " )
108                         if tmp != None:
109                                 ret[ tmp[0] ] = tmp[1]
110                         token = self.peaktoken()
111                 token = self.lex.get_token()
112                 log.debug("%sMap ended with '%s' and '%s'"% (level,token,self.peaktoken()))
113                 if self.peaktoken() in (",",";"):
114                         log.debug("%sFound a delimiter!" % level)
115                         self.lex.get_token()
116                 return ret
117
118         def parsevalue( self, level="" ):
119                 token = self.lex.get_token()
120                 log.debug("%sparsevalue() called on token '%s'" % (level, token))
121                 self.lex.push_token( token )
122                 if token == "(":
123                         value = self.parselist( level+"  " )
124                 elif token == "{":
125                         value = self.parsemap( level+"  " )
126                 else:
127                         value = self.lex.get_token().replace( "\"", "" )
128                 token = self.peaktoken()
129                 if token == ";":
130                         log.debug("%sFound a delimiter!" % level)
131                         self.lex.get_token()
132                 return value
133
134         def parsenamedvalue( self, level="" ):
135                 token = self.lex.get_token()
136                 log.debug("%sparsenamedvalue() called on token '%s'" % (level, token))
137                 if token == "{":
138                         self.lex.push_token( token )
139                         return self.parsemap( level+"  " )
140                 if len(token) > 0 and token not in ("{","}","(",")",",",";"):
141                         log.debug("%sGot name '%s'" %(level,token))
142                         name = token
143                         token = self.lex.get_token()
144                         if token in ("=",":"):
145                                 #print "%sWill parse value" % level
146                                 value = self.parsevalue( level )
147                                 return (name,value)
148                 log.debug("%sparsenamedvalue() will return None!" % level)
149                 return
150
151 #
152 # Have kind of a test directly included...
153 #
154 if __name__ == "__main__":
155
156         import sys
157
158         file = sys.argv[1]
159
160         log.setLevel(logging.DEBUG)
161         devs = DeviceList( file )
162
163         print devs.devices
164
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