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/* bzflag
* Copyright (c) 1993 - 2008 Tim Riker
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the license found in the file
* named COPYING that should have accompanied this file.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <Python.h>
#include <compile.h>
#include <eval.h>
#include "bzfsAPI.h"
#include "PyBZFlag.h"
BZ_GET_PLUGIN_VERSION
static char *ReadFile (const char *filename);
static Python::BZFlag *module_bzflag;
static PyObject *global_dict;
static char *code_buffer;
class PluginHandler : public bz_APIPluginHandler
{
public:
virtual bool handle (bzApiString plugin, bzApiString param);
};
static void
AppendSysPath (char *directory)
{
PyObject *mod_sys, *dict, *path, *dir;
PyErr_Clear ();
dir = Py_BuildValue ("s", directory);
mod_sys = PyImport_ImportModule ("sys");
dict = PyModule_GetDict (mod_sys);
path = PyDict_GetItemString (dict, "path");
if (!PyList_Check (path))
return;
PyList_Append (path, dir);
if (PyErr_Occurred ())
Py_FatalError ("could not build sys.path");
Py_DECREF (mod_sys);
};
bool
PluginHandler::handle (bzApiString plugin, bzApiString param)
{
const char *filename = plugin.c_str ();
char *buffer = ReadFile (filename);
code_buffer = buffer;
PyErr_Clear();
PyCodeObject *code = (PyCodeObject *) Py_CompileString (buffer, plugin.c_str(), Py_file_input);
if (PyErr_Occurred ()) {
PyErr_Print ();
return false;
}
// eek! totally unportable - append the script's directory to sys.path,
// in case there are any local modules
if (strrchr (filename, '/')) {
int len = strrchr (filename, '/') - filename;
char *dir = new char[len + 1];
strncpy (dir, filename, len);
dir[len] = '\0';
AppendSysPath (dir);
free (dir);
} else {
AppendSysPath (".");
}
PyErr_Clear ();
PyEval_EvalCode (code, global_dict, global_dict);
if (PyErr_Occurred ()) {
PyErr_Print ();
return false;
}
return true;
};
static PluginHandler *py_handler;
BZF_PLUGIN_CALL
int
bz_Load (const char *commandLine)
{
// I would use assert here, but "Assertion `3 == 2' failed" is really not a useful error at all
if (BZ_API_VERSION != 5) {
fprintf (stderr, "Python plugin currently wraps the version 5 API, but BZFS is exporting version %d. Please complain loudly\n", BZ_API_VERSION);
abort ();
}
Py_SetProgramName ("BZFlag");
Py_Initialize ();
PyEval_InitThreads ();
module_bzflag = new Python::BZFlag ();
py_handler = new PluginHandler ();
if (!bz_registerCustomPluginHandler ("py", py_handler))
fprintf (stderr, "couldn't register custom plugin handler\n");
// set up the global dict
// FIXME - should this be per-script?
global_dict = PyDict_New ();
PyDict_SetItemString (global_dict, "__builtins__", PyEval_GetBuiltins ());
PyDict_SetItemString (global_dict, "__name__", PyString_FromString ("__main__"));
return 0;
}
BZF_PLUGIN_CALL
int
bz_Unload (void)
{
PyDict_Clear (global_dict);
Py_DECREF (global_dict);
Py_Finalize ();
delete [] code_buffer;
return 0;
}
static char *
ReadFile (const char *filename)
{
FILE *f = fopen (filename, "r");
unsigned int pos = ftell (f);
fseek (f, 0, SEEK_END);
unsigned int len = ftell (f);
fseek (f, pos, SEEK_SET);
char *buffer = new char[len + 1];
fread (buffer, 1, len, f);
buffer[len] = '\0';
fclose (f);
return buffer;
}
// Local Variables: ***
// mode:C++ ***
// tab-width: 8 ***
// c-basic-offset: 2 ***
// indent-tabs-mode: t ***
// End: ***
// ex: shiftwidth=2 tabstop=8
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