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/*=========================================================================
Program: Visualization Toolkit
Module: vtkPythonInteractiveInterpreter.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkPython.h"
#include "vtkPythonInteractiveInterpreter.h"
#include "vtkObjectFactory.h"
#include "vtkSmartPointer.h"
#include "vtkCommand.h"
#include "vtkPythonInterpreter.h"
#include <string>
class vtkPythonInteractiveInterpreter::vtkInternals
{
PyObject* InteractiveConsole;
PyObject* InteractiveConsoleLocals;
std::string PS1;
std::string PS2;
public:
vtkSmartPointer<vtkPythonInterpreter> Interpreter;
vtkInternals() : InteractiveConsole(0), InteractiveConsoleLocals(0) {}
~vtkInternals()
{
this->CleanupPythonObjects();
}
PyObject* GetInteractiveConsolePyObject()
{ return this->InteractiveConsole; }
PyObject* GetInteractiveConsoleLocalsPyObject()
{ return this->InteractiveConsoleLocals; }
void CleanupPythonObjects()
{
vtkPythonScopeGilEnsurer gilEnsurer;
Py_XDECREF(this->InteractiveConsoleLocals);
Py_XDECREF(this->InteractiveConsole);
this->InteractiveConsole = NULL;
this->InteractiveConsoleLocals = NULL;
if (vtkPythonInterpreter::IsInitialized())
{
const char* code = "import gc; gc.collect()\n";
vtkPythonInterpreter::RunSimpleString(code);
}
}
PyObject* GetInteractiveConsole()
{
if (this->InteractiveConsole)
{
return this->InteractiveConsole;
}
vtkPythonInterpreter::Initialize();
vtkPythonScopeGilEnsurer gilEnsurer;
// set up the code.InteractiveConsole instance that we'll use.
const char* code = "import code\n"
"__vtkConsoleLocals={'__name__':'__vtkconsole__','__doc__':None}\n"
"__vtkConsole=code.InteractiveConsole(__vtkConsoleLocals)\n";
// The const_cast can be removed for Python 3.3 or later.
PyRun_SimpleString(const_cast<char*>(code));
// Now get the reference to __vtkConsole and save the pointer.
PyObject* main_module = PyImport_AddModule((char*)"__main__");
PyObject* global_dict = PyModule_GetDict(main_module);
this->InteractiveConsole = PyDict_GetItemString(global_dict, "__vtkConsole");
this->InteractiveConsoleLocals = PyDict_GetItemString(global_dict, "__vtkConsoleLocals");
if (!this->InteractiveConsole || !this->InteractiveConsoleLocals)
{
vtkGenericWarningMacro(
"Failed to locate the InteractiveConsole/InteractiveConsoleLocals object.");
return NULL;
}
Py_INCREF(this->InteractiveConsole);
Py_INCREF(this->InteractiveConsoleLocals);
// The const_cast can be removed for Python 3.3 or later.
PyRun_SimpleString(
const_cast<char *>("del __vtkConsole; del __vtkConsoleLocals"));
// Maybe we need an API to enable developers to set the prompts.
// (The const_cast can be removed for Python 3.3 or later).
PyObject* ps1 = PySys_GetObject(const_cast<char*>("ps1"));
if (!ps1)
{
#if PY_VERSION_HEX >= 0x03000000
ps1 = PyUnicode_FromString(">>> ");
#else
ps1 = PyString_FromString(">>> ");
#endif
// The const_cast can be removed for Python 3.3 or later.
PySys_SetObject(const_cast<char*>("ps1"), ps1);
Py_XDECREF(ps1);
}
// The const_cast can be removed for Python 3.3 or later.
PyObject* ps2 = PySys_GetObject(const_cast<char*>("ps2"));
if (!ps2)
{
#if PY_VERSION_HEX >= 0x03000000
ps2 = PyUnicode_FromString("... ");
#else
ps2 = PyString_FromString("... ");
#endif
// The const_cast can be removed for Python 3.3 or later.
PySys_SetObject(const_cast<char*>("ps2"), ps2);
Py_XDECREF(ps2);
}
return this->InteractiveConsole;
}
};
vtkStandardNewMacro(vtkPythonInteractiveInterpreter);
//----------------------------------------------------------------------------
vtkPythonInteractiveInterpreter::vtkPythonInteractiveInterpreter() :
Internals(new vtkPythonInteractiveInterpreter::vtkInternals())
{
this->Internals->Interpreter = vtkSmartPointer<vtkPythonInterpreter>::New();
this->Internals->Interpreter->AddObserver(vtkCommand::AnyEvent,
this, &vtkPythonInteractiveInterpreter::HandleEvents);
}
//----------------------------------------------------------------------------
vtkPythonInteractiveInterpreter::~vtkPythonInteractiveInterpreter()
{
delete this->Internals;
this->Internals = NULL;
}
//----------------------------------------------------------------------------
void vtkPythonInteractiveInterpreter::HandleEvents(
vtkObject* vtkNotUsed(caller), unsigned long eventid, void* calldata)
{
if (eventid == vtkCommand::ExitEvent)
{
this->Internals->CleanupPythonObjects();
}
this->InvokeEvent(eventid, calldata);
}
//----------------------------------------------------------------------------
bool vtkPythonInteractiveInterpreter::Push(const char* const code)
{
PyObject* console = this->Internals->GetInteractiveConsole();
if (!console)
{
return false;
}
// The embedded python interpreter cannot handle DOS line-endings, see
// http://sourceforge.net/tracker/?group_id=5470&atid=105470&func=detail&aid=1167922
std::string buffer = code ? code : "";
// replace "\r\n" with "\n"
std::string::size_type i = buffer.find("\r\n");
for(; i != std::string::npos; i = buffer.find("\r\n", i))
{
buffer.replace(i, 2, "\n");
i++;
}
// replace "\r" with "\n" (sometimes seen on Mac)
i = buffer.find("\r");
for(; i != std::string::npos; i = buffer.find("\r", i))
{
buffer.replace(i, 1, "\n");
i++;
}
vtkPythonScopeGilEnsurer gilEnsurer;
bool ret_value = false;
// The const_cast can be removed for Python 3.4 or later.
PyObject *res = PyObject_CallMethod(console,
const_cast<char*>("push"), const_cast<char*>("z"), buffer.c_str());
if (res)
{
int status = 0;
if (PyArg_Parse(res, (char*)"i", &status))
{
ret_value = (status>0);
}
Py_DECREF(res);
}
return ret_value;
}
//----------------------------------------------------------------------------
int vtkPythonInteractiveInterpreter::RunStringWithConsoleLocals(const char* script)
{
// The implementation of this method is modeled after
// PyRun_SimpleStringFlags() found in Python's pythonrun.c
this->Internals->GetInteractiveConsole(); //ensure the console is initialized
vtkPythonScopeGilEnsurer gilEnsurer;
PyObject* context = this->Internals->GetInteractiveConsoleLocalsPyObject();
// The const_cast can be removed for Python 3.3 or later.
PyObject* result = PyRun_String(const_cast<char*>(script),
Py_file_input, context, context);
if (result == NULL)
{
PyErr_Print();
return -1;
}
Py_DECREF(result);
#if PY_VERSION_HEX >= 0x03000000
// The const_cast can be removed for Python 3.3 or later.
PyObject *f = PySys_GetObject(const_cast<char*>("stdout"));
if (f == 0 || PyFile_WriteString("\n", f) != 0)
{
PyErr_Clear();
}
#else
if (Py_FlushLine())
{
PyErr_Clear();
}
#endif
return 0;
}
//----------------------------------------------------------------------------
void vtkPythonInteractiveInterpreter::Reset()
{
this->Internals->CleanupPythonObjects();
}
//----------------------------------------------------------------------------
void* vtkPythonInteractiveInterpreter::GetInteractiveConsolePyObject()
{
return this->Internals->GetInteractiveConsolePyObject();
}
//----------------------------------------------------------------------------
void* vtkPythonInteractiveInterpreter::GetInteractiveConsoleLocalsPyObject()
{
return this->Internals->GetInteractiveConsoleLocalsPyObject();
}
//----------------------------------------------------------------------------
void vtkPythonInteractiveInterpreter::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
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