src/python.cc

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2
   3 #include "python.hh"
   4
   5 #include <vector>
   6 #include <algorithm>
   7
   8 namespace ob {
   9
  10 typedef std::vector<PyObject*> FunctionList;
  11
  12 static FunctionList callbacks[OBActions::NUM_ACTIONS];
  13
  14 bool python_register(int action, PyObject *callback)
  15 {
  16   if (action < 0 || action >= OBActions::NUM_ACTIONS) {
  17     PyErr_SetString(PyExc_AssertionError, "Invalid action type.");
  18     return false;
  19   }
  20   if (!PyCallable_Check(callback)) {
  21     PyErr_SetString(PyExc_AssertionError, "Invalid callback function.");
  22     return false;
  23   }
  24
  25   FunctionList::iterator it = std::find(callbacks[action].begin(),
  26                                         callbacks[action].end(),
  27                                         callback);
  28   if (it == callbacks[action].end()) { // not already in there
  29     Py_XINCREF(callback);              // Add a reference to new callback
  30     callbacks[action].push_back(callback);
  31   }
  32   return true;
  33 }
  34
  35 bool python_unregister(int action, PyObject *callback)
  36 {
  37   if (action < 0 || action >= OBActions::NUM_ACTIONS) {
  38     PyErr_SetString(PyExc_AssertionError, "Invalid action type.");
  39     return false;
  40   }
  41   if (!PyCallable_Check(callback)) {
  42     PyErr_SetString(PyExc_AssertionError, "Invalid callback function.");
  43     return false;
  44   }
  45
  46   FunctionList::iterator it = std::find(callbacks[action].begin(),
  47                                         callbacks[action].end(),
  48                                         callback);
  49   if (it != callbacks[action].end()) { // its been registered before
  50     Py_XDECREF(*it);                   // Dispose of previous callback
  51     callbacks[action].erase(it);
  52   }
  53   return true;
  54 }
  55
  56 void python_callback(OBActions::ActionType action, Window window,
  57                      OBWidget::WidgetType type, unsigned int state,
  58                      long d1, long d2)
  59 {
  60   PyObject *arglist;
  61   PyObject *result;
  62
  63   assert(action >= 0 && action < OBActions::NUM_ACTIONS);
  64
  65   arglist = Py_BuildValue("iliill", action, window, type, state, d1, d2);
  66
  67   FunctionList::iterator it, end = callbacks[action].end();
  68   for (it = callbacks[action].begin(); it != end; ++it) {
  69     // call the callback
  70     result = PyEval_CallObject(*it, arglist);
  71     if (result) {
  72       Py_DECREF(result);
  73     } else {
  74       // an exception occured in the script, display it
  75       PyErr_Print();
  76     }
  77   }
  78
  79   Py_DECREF(arglist);
  80 }
  81
  82 }