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koffice/lib/kross/python/pythonscript.cpp

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/***************************************************************************
* pythonscript.cpp
* This file is part of the KDE project
* copyright (C)2004-2005 by Sebastian Sauer (mail@dipe.org)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
* You should have received a copy of the GNU Library General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
***************************************************************************/
#include "pythonscript.h"
#include "pythonmodule.h"
#include "pythoninterpreter.h"
#include "pythonsecurity.h"
#include "../main/scriptcontainer.h"
//#include <kapplication.h>
using namespace Kross::Python;
namespace Kross { namespace Python {
/// @internal
class PythonScriptPrivate
{
public:
/**
* The \a Py::Module instance this \a PythonScript
* has as local context.
*/
Py::Module* m_module;
/**
* The PyCodeObject object representing the
* compiled python code. Internaly we first
* compile the python code and later execute
* it.
*/
Py::Object* m_code;
/**
* A list of functionnames.
*/
TQStringList m_functions;
/**
* A list of classnames.
*/
TQStringList m_classes;
};
}}
PythonScript::PythonScript(Kross::Api::Interpreter* interpreter, Kross::Api::ScriptContainer* scriptcontainer)
: Kross::Api::Script(interpreter, scriptcontainer)
, d(new PythonScriptPrivate())
{
#ifdef KROSS_PYTHON_SCRIPT_CTOR_DEBUG
krossdebug("PythonScript::PythonScript() Constructor.");
#endif
d->m_module = 0;
d->m_code = 0;
}
PythonScript::~PythonScript()
{
#ifdef KROSS_PYTHON_SCRIPT_DTOR_DEBUG
krossdebug("PythonScript::~PythonScript() Destructor.");
#endif
finalize();
delete d;
}
void PythonScript::initialize()
{
finalize();
clearException(); // clear previously thrown exceptions.
try {
if(m_scriptcontainer->getCode().isNull())
throw Kross::Api::Exception::Ptr( new Kross::Api::Exception(TQString("Invalid scripting code for script '%1'").tqarg( m_scriptcontainer->getName() )) );
if(m_scriptcontainer->getName().isNull())
throw Kross::Api::Exception::Ptr( new Kross::Api::Exception(TQString("Name for the script is invalid!")) );
PyObject* pymod = PyModule_New( (char*) m_scriptcontainer->getName().latin1() );
d->m_module = new Py::Module(pymod, true);
if(! d->m_module)
throw Kross::Api::Exception::Ptr( new Kross::Api::Exception(TQString("Failed to initialize local module context for script '%1'").tqarg( m_scriptcontainer->getName() )) );
#ifdef KROSS_PYTHON_SCRIPT_INIT_DEBUG
krossdebug( TQString("PythonScript::initialize() module='%1' refcount='%2'").tqarg(d->m_module->as_string().c_str()).tqarg(d->m_module->reference_count()) );
#endif
// Set the "self" variable to point to the ScriptContainer
// we are using for the script. That way we are able to
// simply access the ScriptContainer itself from within
// python scripting code.
Py::Dict moduledict = d->m_module->getDict();
moduledict["self"] = PythonExtension::toPyObject( m_scriptcontainer );
//moduledict["parent"] = PythonExtension::toPyObject( m_manager );
/*
// Prepare the local context.
TQString s =
//"import sys\n"
"if self.has(\"stdout\"):\n"
" self.stdout = Redirect( self.get(\"stdout\") )\n"
"if self.has(\"stderr\"):\n"
" self.stderr = Redirect( self.get(\"stderr\") )\n"
;
Py::Dict mainmoduledict = ((PythonInterpreter*)m_interpreter)->mainModule()->getDict();
PyObject* pyrun = PyRun_StringFlags((char*)s.latin1(), Py_file_input, mainmoduledict.ptr(), moduledict.ptr());
if(! pyrun)
throw Py::Exception(); // throw exception
Py_XDECREF(pyrun); // free the reference.
*/
// Compile the python script code. It will be later on request
// executed. That way we cache the compiled code.
PyObject* code = 0;
bool restricted = m_scriptcontainer->getOption("restricted", TQVariant(false,0), true).toBool();
krossdebug( TQString("PythonScript::initialize() name=%1 restricted=%2").tqarg(m_scriptcontainer->getName()).tqarg(restricted) );
if(restricted) {
// Use the RestrictedPython module wrapped by the PythonSecurity class.
code = dynamic_cast<PythonInterpreter*>(m_interpreter)->securityModule()->compile_restricted(
m_scriptcontainer->getCode(),
m_scriptcontainer->getName(),
"exec"
);
}
else {
//PyCompilerFlags* cf = new PyCompilerFlags;
//cf->cf_flags |= PyCF_SOURCE_IS_UTF8;
// Just compile the code without any restrictions.
code = Py_CompileString(
(char*) m_scriptcontainer->getCode().latin1(),
(char*) m_scriptcontainer->getName().latin1(),
Py_file_input
);
}
if(! code)
throw Py::Exception();
d->m_code = new Py::Object(code, true);
}
catch(Py::Exception& e) {
TQString err = Py::value(e).as_string().c_str();
Kross::Api::Exception::Ptr exception = toException( TQString("Failed to compile python code: %1").tqarg(err) );
e.clear(); // exception is handled. clear it now.
throw exception;
}
}
void PythonScript::finalize()
{
#ifdef KROSS_PYTHON_SCRIPT_FINALIZE_DEBUG
if(d->m_module)
krossdebug( TQString("PythonScript::finalize() module='%1' refcount='%2'").tqarg(d->m_module->as_string().c_str()).tqarg(d->m_module->reference_count()) );
#endif
delete d->m_module; d->m_module = 0;
delete d->m_code; d->m_code = 0;
d->m_functions.clear();
d->m_classes.clear();
}
Kross::Api::Exception::Ptr PythonScript::toException(const TQString& error)
{
long lineno = -1;
TQStringList errorlist;
PyObject *type, *value, *traceback;
PyErr_Fetch(&type, &value, &traceback);
Py_FlushLine();
PyErr_NormalizeException(&type, &value, &traceback);
if(traceback) {
Py::List tblist;
try {
Py::Module tbmodule( PyImport_Import(Py::String("traceback").ptr()), true );
Py::Dict tbdict = tbmodule.getDict();
Py::Callable tbfunc(tbdict.getItem("format_tb"));
Py::Tuple args(1);
args.setItem(0, Py::Object(traceback));
tblist = tbfunc.apply(args);
uint length = tblist.length();
for(Py::List::size_type i = 0; i < length; ++i)
errorlist.append( Py::Object(tblist[i]).as_string().c_str() );
}
catch(Py::Exception& e) {
TQString err = Py::value(e).as_string().c_str();
e.clear(); // exception is handled. clear it now.
krosswarning( TQString("Kross::Python::PythonScript::toException() Failed to fetch a traceback: %1").tqarg(err) );
}
PyObject *next;
while (traceback && traceback != Py_None) {
PyFrameObject *frame = (PyFrameObject*)PyObject_GetAttrString(traceback, "tb_frame");
Py_DECREF(frame);
{
PyObject *getobj = PyObject_GetAttrString(traceback, "tb_lineno");
lineno = PyInt_AsLong(getobj);
Py_DECREF(getobj);
}
if(Py_OptimizeFlag) {
PyObject *getobj = PyObject_GetAttrString(traceback, "tb_lasti");
int lasti = PyInt_AsLong(getobj);
Py_DECREF(getobj);
lineno = PyCode_Addr2Line(frame->f_code, lasti);
}
//const char* filename = PyString_AsString(frame->f_code->co_filename);
//const char* name = PyString_AsString(frame->f_code->co_name);
//errorlist.append( TQString("%1#%2: \"%3\"").tqarg(filename).tqarg(lineno).tqarg(name) );
next = PyObject_GetAttrString(traceback, "tb_next");
Py_DECREF(traceback);
traceback = next;
}
}
if(lineno < 0) {
if(value) {
PyObject *getobj = PyObject_GetAttrString(value, "lineno");
if(getobj) {
lineno = PyInt_AsLong(getobj);
Py_DECREF(getobj);
}
}
if(lineno < 0)
lineno = 0;
}
//PyErr_Restore(type, value, traceback);
Kross::Api::Exception::Ptr exception = new Kross::Api::Exception(error, lineno - 1);
if(errorlist.count() > 0)
exception->setTrace( errorlist.join("\n") );
return exception;
}
const TQStringList& PythonScript::getFunctionNames()
{
if(! d->m_module)
initialize(); //TODO catch exception
return d->m_functions;
/*
TQStringList list;
Py::List l = d->m_module->getDict().keys();
int length = l.length();
for(Py::List::size_type i = 0; i < length; ++i)
list.append( l[i].str().as_string().c_str() );
return list;
*/
}
Kross::Api::Object::Ptr PythonScript::execute()
{
#ifdef KROSS_PYTHON_SCRIPT_EXEC_DEBUG
krossdebug( TQString("PythonScript::execute()") );
#endif
try {
if(! d->m_module)
initialize();
// the main module dictonary.
Py::Dict mainmoduledict = ((PythonInterpreter*)m_interpreter)->mainModule()->getDict();
// the local context dictonary.
Py::Dict moduledict( d->m_module->getDict().ptr() );
// Initialize context before execution.
TQString s =
"import sys\n"
//"if self.has(\"stdout\"):\n"
//" sys.stdout = Redirect( self.get(\"stdout\") )\n"
//"if self.has(\"stderr\"):\n"
//" sys.stderr = Redirect( self.get(\"stderr\") )\n"
;
PyObject* pyrun = PyRun_String(s.latin1(), Py_file_input, mainmoduledict.ptr(), moduledict.ptr());
if(! pyrun)
throw Py::Exception(); // throw exception
Py_XDECREF(pyrun); // free the reference.
// Acquire interpreter lock*/
PyGILState_STATE gilstate = PyGILState_Ensure();
// Evaluate the already compiled code.
PyObject* pyresult = PyEval_EvalCode(
(PyCodeObject*)d->m_code->ptr(),
mainmoduledict.ptr(),
moduledict.ptr()
);
// Free interpreter lock
PyGILState_Release(gilstate);
if(! pyresult || PyErr_Occurred()) {
krosswarning("Kross::Python::PythonScript::execute(): Failed to PyEval_EvalCode");
throw Py::Exception();
}
Py::Object result(pyresult, true);
#ifdef KROSS_PYTHON_SCRIPT_EXEC_DEBUG
krossdebug( TQString("PythonScript::execute() result=%1").tqarg(result.as_string().c_str()) );
#endif
for(Py::Dict::iterator it = moduledict.begin(); it != moduledict.end(); ++it) {
Py::Dict::value_type vt(*it);
if(PyClass_Check( vt.second.ptr() )) {
#ifdef KROSS_PYTHON_SCRIPT_EXEC_DEBUG
krossdebug( TQString("PythonScript::execute() class '%1' added.").tqarg(vt.first.as_string().c_str()) );
#endif
d->m_classes.append( vt.first.as_string().c_str() );
}
else if(vt.second.isCallable()) {
#ifdef KROSS_PYTHON_SCRIPT_EXEC_DEBUG
krossdebug( TQString("PythonScript::execute() function '%1' added.").tqarg(vt.first.as_string().c_str()) );
#endif
d->m_functions.append( vt.first.as_string().c_str() );
}
}
Kross::Api::Object::Ptr r = PythonExtension::toObject(result);
return r;
}
catch(Py::Exception& e) {
try {
Py::Object errobj = Py::value(e);
if(errobj.ptr() == Py_None) // at least string-exceptions have there errormessage in the type-object
errobj = Py::type(e);
TQString err = errobj.as_string().c_str();
Kross::Api::Exception::Ptr exception = toException( TQString("Failed to execute python code: %1").tqarg(err) );
e.clear(); // exception is handled. clear it now.
setException( exception );
}
catch(Py::Exception& e) {
TQString err = Py::value(e).as_string().c_str();
Kross::Api::Exception::Ptr exception = toException( TQString("Failed to execute python code: %1").tqarg(err) );
e.clear(); // exception is handled. clear it now.
setException( exception );
}
}
catch(Kross::Api::Exception::Ptr e) {
setException(e);
}
return 0; // return nothing if exception got thrown.
}
Kross::Api::Object::Ptr PythonScript::callFunction(const TQString& name, Kross::Api::List::Ptr args)
{
#ifdef KROSS_PYTHON_SCRIPT_CALLFUNC_DEBUG
krossdebug( TQString("PythonScript::callFunction(%1, %2)")
.tqarg(name)
.tqarg(args ? TQString::number(args->count()) : TQString("NULL")) );
#endif
if(hadException()) return 0; // abort if we had an unresolved exception.
if(! d->m_module) {
setException( new Kross::Api::Exception(TQString("Script not initialized.")) );
return 0;
}
try {
Py::Dict moduledict = d->m_module->getDict();
// Try to determinate the function we like to execute.
PyObject* func = PyDict_GetItemString(moduledict.ptr(), name.latin1());
if( (! d->m_functions.contains(name)) || (! func) )
throw Kross::Api::Exception::Ptr( new Kross::Api::Exception(TQString("No such function '%1'.").tqarg(name)) );
Py::Callable funcobject(func, true); // the funcobject takes care of freeing our func pyobject.
// Check if the object is really a function and therefore callable.
if(! funcobject.isCallable())
throw Kross::Api::Exception::Ptr( new Kross::Api::Exception(TQString("Function is not callable.")) );
// Call the function.
Py::Object result = funcobject.apply(PythonExtension::toPyTuple(args));
return PythonExtension::toObject(result);
}
catch(Py::Exception& e) {
TQString err = Py::value(e).as_string().c_str();
e.clear(); // exception is handled. clear it now.
setException( new Kross::Api::Exception(TQString("Python Exception: %1").tqarg(err)) );
}
catch(Kross::Api::Exception::Ptr e) {
setException(e);
}
return 0; // return nothing if exception got thrown.
}
const TQStringList& PythonScript::getClassNames()
{
if(! d->m_module)
initialize(); //TODO catch exception
return d->m_classes;
}
Kross::Api::Object::Ptr PythonScript::classInstance(const TQString& name)
{
if(hadException()) return 0; // abort if we had an unresolved exception.
if(! d->m_module) {
setException( new Kross::Api::Exception(TQString("Script not initialized.")) );
return 0;
}
try {
Py::Dict moduledict = d->m_module->getDict();
// Try to determinate the class.
PyObject* pyclass = PyDict_GetItemString(moduledict.ptr(), name.latin1());
if( (! d->m_classes.contains(name)) || (! pyclass) )
throw Kross::Api::Exception::Ptr( new Kross::Api::Exception(TQString("No such class '%1'.").tqarg(name)) );
PyObject *pyobj = PyInstance_New(pyclass, 0, 0);//aclarg, 0);
if(! pyobj)
throw Kross::Api::Exception::Ptr( new Kross::Api::Exception(TQString("Failed to create instance of class '%1'.").tqarg(name)) );
Py::Object classobject(pyobj, true);
#ifdef KROSS_PYTHON_SCRIPT_CLASSINSTANCE_DEBUG
krossdebug( TQString("PythonScript::classInstance() inst='%1'").tqarg(classobject.as_string().c_str()) );
#endif
return PythonExtension::toObject(classobject);
}
catch(Py::Exception& e) {
TQString err = Py::value(e).as_string().c_str();
e.clear(); // exception is handled. clear it now.
setException( Kross::Api::Exception::Ptr( new Kross::Api::Exception(err) ) );
}
catch(Kross::Api::Exception::Ptr e) {
setException(e);
}
return 0; // return nothing if exception got thrown.
}