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#include "Interpreter.h"
#include <iostream>
#include <map>
#include <boost/format.hpp>
PyThreadState* Interpreter::MainThreadState = NULL;
Interpreter::Interpreter( )
{
PyEval_AcquireLock( );
m_threadState = Py_NewInterpreter( );
PyObject *module = PyImport_ImportModule("__main__");
loc = glb = PyModule_GetDict(module);
SetupRedirector( m_threadState );
PyRun_SimpleString("import sys\n"
"import redirector\n"
"sys.path.insert(0, \".\")\n" // add current path
"sys.stdout = redirector.redirector()\n"
"sys.stderr = sys.stdout\n"
"import rlcompleter\n"
"sys.completer = rlcompleter.Completer()\n"
);
PyEval_ReleaseThread( m_threadState );
}
Interpreter::~Interpreter( )
{
#ifndef NDEBUG
std::cout << "delete interpreter\n";
#endif
PyEval_AcquireThread( m_threadState );
Py_EndInterpreter( m_threadState );
PyEval_ReleaseLock( );
}
void
Interpreter::test( )
{
PyEval_AcquireThread( m_threadState );
PyObject* py_result;
PyObject* dum;
std::string command = "print 'Hello world'\n";
py_result = Py_CompileString(command.c_str(), "<stdin>", Py_single_input);
if ( py_result == 0 )
{
std::cout << "Huh?\n";
PyEval_ReleaseThread( m_threadState );
return;
}
dum = PyEval_EvalCode ((PyCodeObject *)py_result, glb, loc);
Py_XDECREF (dum);
Py_XDECREF (py_result);
std::cout << GetResultString( m_threadState );
GetResultString( m_threadState ) = "";
PyEval_ReleaseThread( m_threadState );
}
std::string
Interpreter::interpret( const std::string& command, int* errorCode )
{
PyEval_AcquireThread( m_threadState );
*errorCode = 0;
PyObject* py_result;
PyObject* dum;
std::string res;
#ifndef NDEBUG
std::cout << "interpreting (" << command << ")\n";
#endif
py_result = Py_CompileString(command.c_str(), "<stdin>", Py_single_input);
if ( py_result == 0 )
{
#ifndef NDEBUG
std::cout << "Huh?\n";
#endif
if ( PyErr_Occurred( ) )
{
*errorCode = 1;
PyErr_Print( );
res = GetResultString( m_threadState );
GetResultString( m_threadState ) = "";
}
PyEval_ReleaseThread( m_threadState );
return res;
}
dum = PyEval_EvalCode ((PyCodeObject *)py_result, glb, loc);
Py_XDECREF (dum);
Py_XDECREF (py_result);
if ( PyErr_Occurred( ) )
{
*errorCode = 1;
PyErr_Print( );
}
res = GetResultString( m_threadState );
GetResultString( m_threadState ) = "";
PyEval_ReleaseThread( m_threadState );
return res;
}
const std::list<std::string>& Interpreter::suggest( const std::string& hint )
{
PyEval_AcquireThread( m_threadState );
m_suggestions.clear();
int i = 0;
std::string command = boost::str(
boost::format("sys.completer.complete('%1%', %2%)\n")
% hint
% i);
#ifndef NDEBUG
std::cout << command << "\n";
#endif
std::string res;
do
{
PyObject* py_result;
PyObject* dum;
py_result = Py_CompileString(command.c_str(), "<stdin>", Py_single_input);
dum = PyEval_EvalCode ((PyCodeObject *)py_result, glb, loc);
Py_XDECREF (dum);
Py_XDECREF (py_result);
res = GetResultString( m_threadState );
GetResultString( m_threadState ) = "";
++i;
command = boost::str(
boost::format("sys.completer.complete('%1%', %2%)\n")
% hint
% i);
if (res.size())
{
// throw away the newline
res = res.substr(1, res.size() - 3);
m_suggestions.push_back(res);
}
}
while (res.size());
PyEval_ReleaseThread( m_threadState );
return m_suggestions;
}
void
Interpreter::Initialize( )
{
Py_Initialize( );
PyEval_InitThreads( );
MainThreadState = PyEval_SaveThread( );
}
void
Interpreter::Finalize( )
{
PyEval_RestoreThread( MainThreadState );
Py_Finalize( );
}
std::string& Interpreter::GetResultString( PyThreadState* threadState )
{
static std::map< PyThreadState*, std::string > ResultStrings;
if ( !ResultStrings.count( threadState ) )
{
ResultStrings[ threadState ] = "";
}
return ResultStrings[ threadState ];
}
PyObject* Interpreter::RedirectorInit(PyObject *, PyObject *)
{
Py_INCREF(Py_None);
return Py_None;
}
PyObject* Interpreter::RedirectorWrite(PyObject *, PyObject *args)
{
char* output;
PyObject *selfi;
if (!PyArg_ParseTuple(args,"Os",&selfi,&output))
{
return NULL;
}
std::string outputString( output );
PyThreadState* currentThread = PyThreadState_Get( );
std::string& resultString = GetResultString( currentThread );
resultString = resultString + outputString;
Py_INCREF(Py_None);
return Py_None;
}
PyMethodDef Interpreter::ModuleMethods[] = { {NULL,NULL,0,NULL} };
PyMethodDef Interpreter::RedirectorMethods[] =
{
{"__init__", Interpreter::RedirectorInit, METH_VARARGS,
"initialize the stdout/err redirector"},
{"write", Interpreter::RedirectorWrite, METH_VARARGS,
"implement the write method to redirect stdout/err"},
{NULL,NULL,0,NULL},
};
void Interpreter::SetupRedirector( PyThreadState* threadState )
{
PyMethodDef *def;
/* create a new module and class */
PyObject *module = Py_InitModule("redirector", ModuleMethods);
PyObject *moduleDict = PyModule_GetDict(module);
PyObject *classDict = PyDict_New();
PyObject *className = PyString_FromString("redirector");
PyObject *fooClass = PyClass_New(NULL, classDict, className);
PyDict_SetItemString(moduleDict, "redirector", fooClass);
Py_DECREF(classDict);
Py_DECREF(className);
Py_DECREF(fooClass);
/* add methods to class */
for (def = RedirectorMethods; def->ml_name != NULL; def++) {
PyObject *func = PyCFunction_New(def, NULL);
PyObject *method = PyMethod_New(func, NULL, fooClass);
PyDict_SetItemString(classDict, def->ml_name, method);
Py_DECREF(func);
Py_DECREF(method);
}
}
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