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#include <Python.h>
#include <stdio.h>
#include <string.h>
#include "interpreter.h"
/**
* \internal
* Stores modules in a linked list so that they don't have to be reloaded every time.
*/
typedef struct PyObjectListElem
{
PyObject *object;
struct PyObjectListElem *next;
} PyObjectListElem;
typedef struct PyObjectList
{
PyObjectListElem *root;
int count;
} PyObjectList;
PyObjectList *createObjectList()
{
PyObjectList *ret = malloc(sizeof(PyObjectList));
ret->count = 0;
ret->root = 0;
return ret;
}
void insert(PyObjectList* list, PyObject *object)
{
if (!list || !object)
return;
PyObjectListElem *node = malloc(sizeof(PyObjectListElem));
node->object = object;
node->next = list->root;
list->root = node;
list->count++;
}
PyObject *moduleNamed(const char *name, PyObjectList *list)
{
PyObjectListElem *node = list->root;
while (node)
{
if (strcmp(PyModule_GetName(node->object), name) == 0)
return node->object;
node = node->next;
}
return NULL;
}
int listCount(PyObjectList *list)
{
return (list ? list->count : 0);
}
void freeList(PyObjectList *list, int deref)
{
if (!list)
return;
PyObjectListElem *node = list->root;
while (node)
{
PyObjectListElem *tmp = node;
node = node->next;
if (deref)
{
Py_DECREF(tmp->object);
}
free(tmp);
}
free(list);
}
/**
* \internal
* A Python interpreter object keeps the context like the loaded modules.
*/
struct Interpreter
{
PyObjectList *modules;
} *in = 0;
/** \defgroup layman_base Layman base
*
* \brief Layman Base functions
*
* These functions are used when you want to begin or end using the library.
*/
/** \addtogroup layman_base
* @{
*/
/**
* This is the first function that must be called before using the library.
* It initializes the Python interpreter.
*/
void laymanInit()
{
if (in)
return;
if (!Py_IsInitialized())
Py_Initialize();
in = malloc(sizeof(struct Interpreter));
in->modules = createObjectList();
}
/**
* Call this function when you're done using the library.
* It will free memory.
*/
void laymanFinalize()
{
if (!in)
return;
freeList(in->modules, 1);
free(in);
if (Py_IsInitialized())
Py_Finalize();
}
/** @} */
/**
* \internal
* printf() like function that executes a python function
*
* \param module name of the python module in which the function is
* \param funcName the function name to call
* \param format printf() like list of arguments. See Python documentation
* \param ... arguments for the function
*
* \return the result of the execution. Can be NULL if the call failed.
*/
PyObject *executeFunction(const char *module, const char *funcName, const char* format, ...)
{
assert(in);
// Make argument list
PyObject *args;
if (format == NULL || strcmp(format, "") == 0)
args = PyTuple_New(0);
else
{
va_list listArgs;
va_start(listArgs, format);
args = Py_VaBuildValue(format, listArgs);
}
// Look for the module.
PyObject *mod = 0;
if (in->modules)
{
mod = moduleNamed(module, in->modules);
}
// If module is not loaded yet, do it.
if (!mod)
{
mod = PyImport_ImportModule(module);
if (!mod)
return NULL;
insert(in->modules, mod);
}
// Look for the function
PyObject *func = PyObject_GetAttrString(mod, funcName);
if (!PyCallable_Check(func))
return NULL;
// Execute it
PyObject *val = PyObject_CallObject(func, args);
if (args != NULL)
{
Py_DECREF(args);
}
return val;
}
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