root/trunk/libffado/support/mixer-qt4/ffado/configuration.py

Revision 2686, 5.3 kB (checked in by jwoithe, 7 years ago)

ffado-mixer: replace configuration key search with a construct which is compatible with both python2 and python3. Suggestion is from Xavier Forestier.

  • Property svn:mergeinfo set to
Line 
1 #
2 # Copyright (C) 2008-2009 by Arnold Krille
3 #
4 # This file is part of FFADO
5 # FFADO = Free Firewire (pro-)audio drivers for linux
6 #
7 # FFADO is based upon FreeBoB.
8 #
9 # This program is free software: you can redistribute it and/or modify
10 # it under the terms of the GNU General Public License as published by
11 # the Free Software Foundation, either version 3 of the License, or
12 # (at your option) any later version.
13 #
14 # This program is distributed in the hope that it will be useful,
15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 # GNU General Public License for more details.
18 #
19 # You should have received a copy of the GNU General Public License
20 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
21 #
22
23 import re, os
24
25 import shlex
26
27 import logging
28 log = logging.getLogger('configparser')
29
30 class DeviceList:
31     def __init__( self, filename="" ):
32         self.devices = list()
33         if not filename == "":
34             self.updateFromFile( filename )
35
36     def updateFromFile( self, filename, must_exist=False):
37         filename = os.path.expanduser(filename)
38         log.debug("DeviceList::updateFromFile(%s)" % filename)
39         if not os.path.exists( filename ):
40             if must_exist:
41                 log.error("cannot open file")
42             return
43         f = open( filename, "r" )
44
45         lex = Parser( f )
46         config = {}
47         while lex.peaktoken() != lex.eof:
48             tmp = lex.parsenamedvalue()
49             if tmp != None:
50                 config[ tmp[0] ] = tmp[1]
51         if "device_definitions" in config:
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
165 # vim: et
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