pyvconv.py

   1 import libxml2
   2 import re
   3
   4 class RenderCommand:
   5     def __init__(self, name, callcmd):
   6         self.name    = name
   7         self.callcmd = callcmd
   8         self.varlist = {}
   9         self.varlist["in"]  = None
  10         self.varlist["out"] = None
  11
  12     def set_var(self, varstring, value):
  13         self.varlist[varstring] = value
  14
  15     def execute(self):
  16         resstring = self.callcmd
  17         for var in self.varlist:
  18             p = re.compile( '\$\{' + var + '\}')
  19             resstring = p.sub( self.varlist[var], resstring)
  20
  21         print resstring
  22
  23 class RenderCommands:
  24     def __init__(self):
  25         self.command_list = {}
  26         self._read_config()
  27
  28     def _read_config(self):
  29         doc = libxml2.parseFile("rendercommands.xml")
  30         name_list = doc.xpathEval( '//command//@name')
  31         call_list = doc.xpathEval( '//command//@call')
  32
  33         for name,call in zip(name_list, call_list):
  34             name = str(name.content)
  35             call = str(call.content)
  36             self.command_list[name] = RenderCommand(name, call)
  37
  38     def __iter__(self):
  39         return self.command_list.values().__iter__()
  40
  41 def main():
  42     commands = RenderCommands()
  43
  44     for c in commands:
  45         c.set_var("in",  "source.avi")
  46         c.set_var("out", "dest.avi")
  47         c.execute()
  48
  49 if __name__ == "__main__":
  50     main()