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#include "module.h"
#include "except.h"
#include "iter.h"
/*
* Helpers
*/
static void
xpybIter_err(xpybIter *self)
{
if (self->is_list)
PyErr_Format(xpybExcept_base,
"Extra items in '%s' list (expect multiple of %d).",
PyString_AS_STRING(self->name), self->groupsize);
else
PyErr_Format(xpybExcept_base,
"Too few items in '%s' list (expect %d).",
PyString_AS_STRING(self->name), self->groupsize);
}
static PyObject *
xpybIter_pop(xpybIter *self)
{
PyObject *cur, *next, *item;
cur = PyList_GET_ITEM(self->stack, self->top);
item = PyIter_Next(cur);
if (item == NULL) {
if (PyErr_Occurred() || self->top < 1)
return NULL;
if (PyList_SetSlice(self->stack, self->top, self->top + 1, NULL) < 0)
return NULL;
self->top--;
return xpybIter_pop(self);
}
if (PySequence_Check(item)) {
next = PyObject_GetIter(item);
if (next == NULL)
goto err1;
if (PyList_Append(self->stack, next) < 0)
goto err2;
self->top++;
Py_DECREF(next);
Py_DECREF(item);
return xpybIter_pop(self);
}
return item;
err2:
Py_DECREF(next);
err1:
Py_DECREF(item);
return NULL;
}
/*
* Infrastructure
*/
static PyObject *
xpybIter_new(PyTypeObject *self, PyObject *args, PyObject *kw)
{
return PyType_GenericNew(self, args, kw);
}
static int
xpybIter_init(xpybIter *self, PyObject *args, PyObject *kw)
{
PyObject *name, *list, *bool;
Py_ssize_t groupsize;
if (!PyArg_ParseTuple(args, "OnSO", &list, &groupsize, &name, &bool))
return -1;
Py_INCREF(self->name = name);
Py_INCREF(self->list = list);
self->groupsize = groupsize;
self->is_list = PyObject_IsTrue(bool);
return 0;
}
static PyObject *
xpybIter_get(xpybIter *self)
{
PyObject *iterator;
Py_CLEAR(self->stack);
self->stack = PyList_New(1);
if (self->stack == NULL)
return NULL;
iterator = PyObject_GetIter(self->list);
if (iterator == NULL)
return NULL;
PyList_SET_ITEM(self->stack, 0, iterator);
self->top = 0;
Py_INCREF(self);
return (PyObject *)self;
}
static PyObject *
xpybIter_next(xpybIter *self)
{
PyObject *tuple, *tmp;
Py_ssize_t i;
tuple = PyTuple_New(self->groupsize);
if (tuple == NULL)
return NULL;
for (i = 0; i < self->groupsize; i++) {
tmp = xpybIter_pop(self);
if (tmp == NULL) {
if (i > 0 && !PyErr_Occurred())
xpybIter_err(self);
goto end;
}
PyTuple_SET_ITEM(tuple, i, tmp);
}
return tuple;
end:
Py_DECREF(tuple);
return NULL;
}
static void
xpybIter_dealloc(xpybIter *self)
{
Py_CLEAR(self->stack);
Py_CLEAR(self->list);
Py_CLEAR(self->name);
xpybIter_type.tp_base->tp_dealloc((PyObject *)self);
}
/*
* Members
*/
/*
* Definition
*/
PyTypeObject xpybIter_type = {
PyObject_HEAD_INIT(NULL)
.tp_name = "xcb.Iterator",
.tp_basicsize = sizeof(xpybIter),
.tp_init = (initproc)xpybIter_init,
.tp_new = xpybIter_new,
.tp_dealloc = (destructor)xpybIter_dealloc,
.tp_flags = Py_TPFLAGS_DEFAULT,
.tp_doc = "XCB flattening-iterator object",
.tp_iter = (getiterfunc)xpybIter_get,
.tp_iternext = (iternextfunc)xpybIter_next
};
/*
* Module init
*/
int xpybIter_modinit(PyObject *m)
{
if (PyType_Ready(&xpybIter_type) < 0)
return -1;
Py_INCREF(&xpybIter_type);
if (PyModule_AddObject(m, "Iterator", (PyObject *)&xpybIter_type) < 0)
return -1;
return 0;
}
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