1
2 """
3 Application class that implements pyFoamReadDictionary
4 """
5
6 import sys,re
7
8 from PyFoamApplication import PyFoamApplication
9
10 from PyFoam.RunDictionary.ParsedParameterFile import ParsedParameterFile
11
14 description="""
15 Reads a value from a Foam-Dictionary and prints it to the screen.
16 The description of the value is word. If the value is
17 non-atomic (a list or a dictionary) it is output in Python-notation.
18 Parts of the expression can be accessed by using the Python-notation for accessing
19 sub-expressions.
20
21 Example of usage:
22 pyFoamReadDictionary.py pitzDaily/0/U "boundaryField['inlet']['type']"
23 """
24
25 PyFoamApplication.__init__(self,
26 args=args,
27 description=description,
28 usage="%prog [options] <dictfile> <key>",
29 nr=2,
30 changeVersion=False,
31 interspersed=True)
32
34 self.parser.add_option("--debug",
35 action="store_true",
36 default=None,
37 dest="debug",
38 help="Debugs the parser")
39
40
42 fName=self.parser.getArgs()[0]
43 all=self.parser.getArgs()[1]
44
45 match=re.compile("([a-zA-Z_][a-zA-Z0-9_]*)(.*)").match(all)
46 if match==None:
47 self.error("Expression",all,"not usable as an expression")
48
49 key=match.group(1)
50 sub=None
51 if len(match.groups())>1:
52 if match.group(2)!="":
53 sub=match.group(2)
54
55 try:
56 dictFile=ParsedParameterFile(fName,backup=False,debug=self.opts.debug)
57 val=dictFile[key]
58 except KeyError:
59 self.error("Key: ",key,"not existing in File",fName)
60 except IOError,e:
61 self.error("Problem with file",fName,":",e)
62
63 if sub==None:
64 erg=val
65 else:
66 try:
67 erg=eval(str(val)+sub)
68 except Exception,e:
69 self.error("Problem with subexpression:",sys.exc_info()[0],":",e)
70
71 print erg
72