kicad/scripting/python_scripting.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2012 NBEE Embedded Systems, Miguel Angel Ajo <miguelangel@nbee.es>
* Copyright (C) 1992-2015 KiCad Developers, see AUTHORS.txt for contributors.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/**
* @file python_scripting.cpp
* @brief methods to add scripting capabilities inside pcbnew
*/
#include <python_scripting.h>
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#include <stdlib.h>
#include <string.h>
#include <fctsys.h>
#include <wxstruct.h>
#include <common.h>
#include <colors.h>
#include <macros.h>
/* init functions defined by swig */
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extern "C" void init_kicad( void );
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extern "C" void init_pcbnew( void );
#define EXTRA_PYTHON_MODULES 10 // this is the number of python
// modules that we want to add into the list
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/* python inittab that links module names to module init functions
* we will rebuild it to include the original python modules plus
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* our own ones
*/
struct _inittab* SwigImportInittab;
static int SwigNumModules = 0;
static bool wxPythonLoaded = false; // true if the wxPython scripting layer was successfully loaded
bool IsWxPythonLoaded()
{
return wxPythonLoaded;
}
/* Add a name + initfuction to our SwigImportInittab */
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static void swigAddModule( const char* name, void (* initfunc)() )
{
SwigImportInittab[SwigNumModules].name = (char*) name;
SwigImportInittab[SwigNumModules].initfunc = initfunc;
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SwigNumModules++;
SwigImportInittab[SwigNumModules].name = (char*) 0;
SwigImportInittab[SwigNumModules].initfunc = 0;
}
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/* Add the builtin python modules */
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static void swigAddBuiltin()
{
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int i = 0;
/* discover the length of the pyimport inittab */
while( PyImport_Inittab[i].name )
i++;
/* allocate memory for the python module table */
SwigImportInittab = (struct _inittab*) malloc(
sizeof(struct _inittab) * (i + EXTRA_PYTHON_MODULES) );
/* copy all pre-existing python modules into our newly created table */
i = 0;
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while( PyImport_Inittab[i].name )
{
swigAddModule( PyImport_Inittab[i].name, PyImport_Inittab[i].initfunc );
i++;
}
}
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/* Function swigAddModules
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* adds the internal modules we offer to the python scripting, so they will be
* available to the scripts we run.
*
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*/
static void swigAddModules()
{
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swigAddModule( "_pcbnew", init_pcbnew );
// finally it seems better to include all in just one module
// but in case we needed to include any other modules,
// it must be done like this:
// swigAddModule( "_kicad", init_kicad );
}
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/* Function swigSwitchPythonBuiltin
* switches python module table to our built one .
*
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*/
static void swigSwitchPythonBuiltin()
{
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PyImport_Inittab = SwigImportInittab;
}
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/* Function pcbnewInitPythonScripting
* Initializes all the python environment and publish our interface inside it
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* initializes all the wxpython interface, and returns the python thread control structure
*
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*/
PyThreadState* g_PythonMainTState;
bool pcbnewInitPythonScripting( const char * aUserPluginsPath )
{
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swigAddBuiltin(); // add builtin functions
swigAddModules(); // add our own modules
swigSwitchPythonBuiltin(); // switch the python builtin modules to our new list
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Py_Initialize();
#ifdef KICAD_SCRIPTING_WXPYTHON
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PyEval_InitThreads();
#ifndef __WINDOWS__ // import wxversion.py currently not working under winbuilder, and not useful.
char cmd[1024];
// Make sure that that the correct version of wxPython is loaded. In systems where there
// are different versions of wxPython installed this can lead to select wrong wxPython
// version being selected.
snprintf( cmd, sizeof(cmd), "import wxversion; wxversion.select('%s')", WXPYTHON_VERSION );
int retv = PyRun_SimpleString( cmd );
if( retv != 0 )
{
wxLogError( wxT( "Python error %d occurred running string `%s`" ), retv, cmd );
PyErr_Print();
Py_Finalize();
return false;
}
#endif // ifndef __WINDOWS__
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// Load the wxPython core API. Imports the wx._core_ module and sets a
// local pointer to a function table located there. The pointer is used
// internally by the rest of the API functions.
if( !wxPyCoreAPI_IMPORT() )
{
wxLogError( wxT( "***** Error importing the wxPython API! *****" ) );
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PyErr_Print();
Py_Finalize();
return false;
}
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wxPythonLoaded = true;
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// Save the current Python thread state and release the
// Global Interpreter Lock.
g_PythonMainTState = wxPyBeginAllowThreads();
#endif // ifdef KICAD_SCRIPTING_WXPYTHON
// load pcbnew inside python, and load all the user plugins, TODO: add system wide plugins
{
char cmd[1024];
PyLOCK lock;
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snprintf( cmd, sizeof(cmd), "import sys, traceback\n"
"sys.path.append(\".\")\n"
"import pcbnew\n"
"pcbnew.LoadPlugins(\"%s\")", aUserPluginsPath );
PyRun_SimpleString( cmd );
}
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return true;
}
void pcbnewFinishPythonScripting()
{
#ifdef KICAD_SCRIPTING_WXPYTHON
wxPyEndAllowThreads( g_PythonMainTState );
#endif
Py_Finalize();
}
#if defined( KICAD_SCRIPTING_WXPYTHON )
void RedirectStdio()
{
// This is a helpful little tidbit to help debugging and such. It
// redirects Python's stdout and stderr to a window that will popup
// only on demand when something is printed, like a traceback.
const char* python_redirect =
"import sys\n"
"import wx\n"
"output = wx.PyOnDemandOutputWindow()\n"
"sys.stderr = output\n";
PyLOCK lock;
PyRun_SimpleString( python_redirect );
}
wxWindow* CreatePythonShellWindow( wxWindow* parent )
{
const char* pycrust_panel =
"import wx\n"
"from wx.py import shell, version\n"
"\n"
"intro = \"PyCrust %s - KiCAD Python Shell\" % version.VERSION\n"
"\n"
"def makeWindow(parent):\n"
" pycrust = shell.Shell(parent, -1, introText=intro)\n"
" return pycrust\n"
"\n";
wxWindow* window = NULL;
PyObject* result;
// As always, first grab the GIL
PyLOCK lock;
// Now make a dictionary to serve as the global namespace when the code is
// executed. Put a reference to the builtins module in it.
PyObject* globals = PyDict_New();
PyObject* builtins = PyImport_ImportModule( "__builtin__" );
PyDict_SetItemString( globals, "__builtins__", builtins );
Py_DECREF( builtins );
// Execute the code to make the makeWindow function we defined above
result = PyRun_String( pycrust_panel, Py_file_input, globals, globals );
// Was there an exception?
if( !result )
{
PyErr_Print();
return NULL;
}
Py_DECREF( result );
// Now there should be an object named 'makeWindow' in the dictionary that
// we can grab a pointer to:
PyObject* func = PyDict_GetItemString( globals, "makeWindow" );
wxASSERT( PyCallable_Check( func ) );
// Now build an argument tuple and call the Python function. Notice the
// use of another wxPython API to take a wxWindows object and build a
// wxPython object that wraps it.
PyObject* arg = wxPyMake_wxObject( parent, false );
wxASSERT( arg != NULL );
PyObject* tuple = PyTuple_New( 1 );
PyTuple_SET_ITEM( tuple, 0, arg );
result = PyEval_CallObject( func, tuple );
// Was there an exception?
if( !result )
PyErr_Print();
else
{
// Otherwise, get the returned window out of Python-land and
// into C++-ville...
bool success = wxPyConvertSwigPtr( result, (void**) &window, _T( "wxWindow" ) );
(void) success;
wxASSERT_MSG( success, _T( "Returned object was not a wxWindow!" ) );
Py_DECREF( result );
}
// Release the python objects we still have
Py_DECREF( globals );
Py_DECREF( tuple );
return window;
}
#endif
wxArrayString PyArrayStringToWx( PyObject* aArrayString )
{
wxArrayString ret;
int list_size = PyList_Size( aArrayString );
for( int n = 0; n<list_size; n++ )
{
PyObject* element = PyList_GetItem( aArrayString, n );
ret.Add( FROM_UTF8( PyString_AsString( element ) ), 1 );
}
return ret;
}
wxString PyErrStringWithTraceback()
{
wxString err;
if( !PyErr_Occurred() )
return err;
PyObject* type;
PyObject* value;
PyObject* traceback;
PyErr_Fetch( &type, &value, &traceback );
PyObject* tracebackModuleString = PyString_FromString( (char*) "traceback" );
PyObject* tracebackModule = PyImport_Import( tracebackModuleString );
PyObject* formatException = PyObject_GetAttrString( tracebackModule,
(char*) "format_exception" );
PyObject* args = Py_BuildValue( "(O,O,O)", type, value, traceback );
PyObject* result = PyObject_CallObject( formatException, args );
Py_DECREF( args );
wxArrayString res = PyArrayStringToWx( result );
for( unsigned i = 0; i<res.Count(); i++ )
{
err += res[i] + wxT( "\n" );
}
PyErr_Clear();
return err;
}