cpython/Modules/_functoolsmodule.c at 2.7 · python-emscripten/cpython · GitHub

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#include "Python.h"

#include "structmember.h"

/* _functools module written and maintained

by Hye-Shik Chang <perky@FreeBSD.org>

with adaptations by Raymond Hettinger <python@rcn.com>

/* reduce() *************************************************************/

static PyObject *

functools_reduce(PyObject *self, PyObject *args)

{

PyObject *seq, *func, *result = NULL, *it;

if (!PyArg_UnpackTuple(args, "reduce", 2, 3, &func, &seq, &result))

return NULL;

if (result != NULL)

Py_INCREF(result);

it = PyObject_GetIter(seq);

if (it == NULL) {

PyErr_SetString(PyExc_TypeError,

"reduce() arg 2 must support iteration");

Py_XDECREF(result);

return NULL;

}

if ((args = PyTuple_New(2)) == NULL)

goto Fail;

for (;;) {

PyObject *op2;

if (args->ob_refcnt > 1) {

Py_DECREF(args);

if ((args = PyTuple_New(2)) == NULL)

goto Fail;

}

op2 = PyIter_Next(it);

if (op2 == NULL) {

if (PyErr_Occurred())

goto Fail;

break;

}

if (result == NULL)

result = op2;

else {

PyTuple_SetItem(args, 0, result);

PyTuple_SetItem(args, 1, op2);

if ((result = PyEval_CallObject(func, args)) == NULL)

goto Fail;

}

Py_DECREF(args);

if (result == NULL)

PyErr_SetString(PyExc_TypeError,

"reduce() of empty sequence with no initial value");

Py_DECREF(it);

return result;

Fail:

Py_XDECREF(args);

Py_XDECREF(result);

Py_DECREF(it);

return NULL;

}

PyDoc_STRVAR(reduce_doc,

"reduce(function, sequence[, initial]) -> value\n\

\n\

Apply a function of two arguments cumulatively to the items of a sequence,\n\

from left to right, so as to reduce the sequence to a single value.\n\

For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) calculates\n\

((((1+2)+3)+4)+5). If initial is present, it is placed before the items\n\

of the sequence in the calculation, and serves as a default when the\n\

sequence is empty.");

/* partial object **********************************************************/

typedef struct {

PyObject_HEAD

PyObject *fn;

PyObject *args;

PyObject *kw;

PyObject *dict;

PyObject *weakreflist; /* List of weak references */

} partialobject;

static PyTypeObject partial_type;

static PyObject *

partial_new(PyTypeObject *type, PyObject *args, PyObject *kw)

{

PyObject *func;

partialobject *pto;

if (PyTuple_GET_SIZE(args) < 1) {

PyErr_SetString(PyExc_TypeError,

"type 'partial' takes at least one argument");

return NULL;

}

func = PyTuple_GET_ITEM(args, 0);

if (!PyCallable_Check(func)) {

PyErr_SetString(PyExc_TypeError,

"the first argument must be callable");

return NULL;

}

/* create partialobject structure */

pto = (partialobject *)type->tp_alloc(type, 0);

if (pto == NULL)

return NULL;

pto->fn = func;

Py_INCREF(func);

pto->args = PyTuple_GetSlice(args, 1, PY_SSIZE_T_MAX);

if (pto->args == NULL) {

Py_DECREF(pto);

return NULL;

}

pto->kw = (kw != NULL) ? PyDict_Copy(kw) : PyDict_New();

if (pto->kw == NULL) {

Py_DECREF(pto);

return NULL;

}

return (PyObject *)pto;

}

static void

partial_dealloc(partialobject *pto)

{

/* bpo-31095: UnTrack is needed before calling any callbacks */

PyObject_GC_UnTrack(pto);

if (pto->weakreflist != NULL)

PyObject_ClearWeakRefs((PyObject *) pto);

Py_XDECREF(pto->fn);

Py_XDECREF(pto->args);

Py_XDECREF(pto->kw);

Py_XDECREF(pto->dict);

Py_TYPE(pto)->tp_free(pto);

}

static PyObject *

partial_call(partialobject *pto, PyObject *args, PyObject *kw)

{

PyObject *ret;

PyObject *argappl, *kwappl;

assert (PyCallable_Check(pto->fn));

assert (PyTuple_Check(pto->args));

assert (PyDict_Check(pto->kw));

if (PyTuple_GET_SIZE(pto->args) == 0) {

argappl = args;

Py_INCREF(args);

} else if (PyTuple_GET_SIZE(args) == 0) {

argappl = pto->args;

Py_INCREF(pto->args);

} else {

argappl = PySequence_Concat(pto->args, args);

if (argappl == NULL)

return NULL;

assert(PyTuple_Check(argappl));

}

if (PyDict_Size(pto->kw) == 0) {

kwappl = kw;

Py_XINCREF(kwappl);

} else {

kwappl = PyDict_Copy(pto->kw);

if (kwappl == NULL) {

Py_DECREF(argappl);

return NULL;

}

if (kw != NULL) {

if (PyDict_Merge(kwappl, kw, 1) != 0) {

Py_DECREF(argappl);

Py_DECREF(kwappl);

return NULL;

}

ret = PyObject_Call(pto->fn, argappl, kwappl);

Py_DECREF(argappl);

Py_XDECREF(kwappl);

return ret;

}

static int

partial_traverse(partialobject *pto, visitproc visit, void *arg)

{

Py_VISIT(pto->fn);

Py_VISIT(pto->args);

Py_VISIT(pto->kw);

Py_VISIT(pto->dict);

return 0;

}

PyDoc_STRVAR(partial_doc,

"partial(func, *args, **keywords) - new function with partial application\n\

of the given arguments and keywords.\n");

#define OFF(x) offsetof(partialobject, x)

static PyMemberDef partial_memberlist[] = {

{"func", T_OBJECT, OFF(fn), READONLY,

"function object to use in future partial calls"},

{"args", T_OBJECT, OFF(args), READONLY,

"tuple of arguments to future partial calls"},

{"keywords", T_OBJECT, OFF(kw), READONLY,

"dictionary of keyword arguments to future partial calls"},

{NULL} /* Sentinel */

};

static PyObject *

partial_get_dict(partialobject *pto)

{

if (pto->dict == NULL) {

pto->dict = PyDict_New();

if (pto->dict == NULL)

return NULL;

}

Py_INCREF(pto->dict);

return pto->dict;

}

static int

partial_set_dict(partialobject *pto, PyObject *value)

{

PyObject *tmp;

/* It is illegal to del p.__dict__ */

if (value == NULL) {

PyErr_SetString(PyExc_TypeError,

"a partial object's dictionary may not be deleted");

return -1;

}

/* Can only set __dict__ to a dictionary */

if (!PyDict_Check(value)) {

PyErr_SetString(PyExc_TypeError,

"setting partial object's dictionary to a non-dict");

return -1;

}

tmp = pto->dict;

Py_INCREF(value);

pto->dict = value;

Py_XDECREF(tmp);

return 0;

}

static PyGetSetDef partial_getsetlist[] = {

{"__dict__", (getter)partial_get_dict, (setter)partial_set_dict},

{NULL} /* Sentinel */

};

/* Pickle strategy:

__reduce__ by itself doesn't support getting kwargs in the unpickle

operation so we define a __setstate__ that replaces all the information

about the partial. If we only replaced part of it someone would use

it as a hook to do strange things.

PyObject *

partial_reduce(partialobject *pto, PyObject *unused)

{

return Py_BuildValue("O(O)(OOOO)", Py_TYPE(pto), pto->fn, pto->fn,

pto->args, pto->kw,

pto->dict ? pto->dict : Py_None);

}

PyObject *

partial_setstate(partialobject *pto, PyObject *state)

{

PyObject *fn, *fnargs, *kw, *dict;

if (!PyTuple_Check(state) ||

!PyArg_ParseTuple(state, "OOOO", &fn, &fnargs, &kw, &dict) ||

!PyCallable_Check(fn) ||

!PyTuple_Check(fnargs) ||

(kw != Py_None && !PyDict_Check(kw)))

{

PyErr_SetString(PyExc_TypeError, "invalid partial state");

return NULL;

}

if(!PyTuple_CheckExact(fnargs))

fnargs = PySequence_Tuple(fnargs);

else

Py_INCREF(fnargs);

if (fnargs == NULL)

return NULL;

if (kw == Py_None)

kw = PyDict_New();

else if(!PyDict_CheckExact(kw))

kw = PyDict_Copy(kw);

else

Py_INCREF(kw);

if (kw == NULL) {

Py_DECREF(fnargs);

return NULL;

}

Py_INCREF(fn);

if (dict == Py_None)

dict = NULL;

else

Py_INCREF(dict);

Py_SETREF(pto->fn, fn);

Py_SETREF(pto->args, fnargs);

Py_SETREF(pto->kw, kw);

Py_XSETREF(pto->dict, dict);

Py_RETURN_NONE;

}

static PyMethodDef partial_methods[] = {

{"__reduce__", (PyCFunction)partial_reduce, METH_NOARGS},

{"__setstate__", (PyCFunction)partial_setstate, METH_O},

{NULL, NULL} /* sentinel */

};

static PyTypeObject partial_type = {

PyVarObject_HEAD_INIT(NULL, 0)

"functools.partial", /* tp_name */

sizeof(partialobject), /* tp_basicsize */

0, /* tp_itemsize */

/* methods */

(destructor)partial_dealloc, /* tp_dealloc */

0, /* tp_print */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_compare */

0, /* tp_repr */

0, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

0, /* tp_hash */

(ternaryfunc)partial_call, /* tp_call */

0, /* tp_str */

PyObject_GenericGetAttr, /* tp_getattro */

PyObject_GenericSetAttr, /* tp_setattro */

0, /* tp_as_buffer */

Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |

Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_WEAKREFS, /* tp_flags */

partial_doc, /* tp_doc */

(traverseproc)partial_traverse, /* tp_traverse */

0, /* tp_clear */

0, /* tp_richcompare */

offsetof(partialobject, weakreflist), /* tp_weaklistoffset */

0, /* tp_iter */

0, /* tp_iternext */

partial_methods, /* tp_methods */

partial_memberlist, /* tp_members */

partial_getsetlist, /* tp_getset */

0, /* tp_base */

0, /* tp_dict */

0, /* tp_descr_get */

0, /* tp_descr_set */

offsetof(partialobject, dict), /* tp_dictoffset */

0, /* tp_init */

0, /* tp_alloc */

partial_new, /* tp_new */

PyObject_GC_Del, /* tp_free */

};

/* module level code ********************************************************/

PyDoc_STRVAR(module_doc,

"Tools that operate on functions.");

static PyMethodDef module_methods[] = {

{"reduce", functools_reduce, METH_VARARGS, reduce_doc},

{NULL, NULL} /* sentinel */

};

PyMODINIT_FUNC

init_functools(void)

{

int i;

PyObject *m;

char *name;

PyTypeObject *typelist[] = {

&partial_type,

NULL

};

m = Py_InitModule3("_functools", module_methods, module_doc);

if (m == NULL)

return;

for (i=0 ; typelist[i] != NULL ; i++) {

if (PyType_Ready(typelist[i]) < 0)

return;

name = strchr(typelist[i]->tp_name, '.');

assert (name != NULL);

Py_INCREF(typelist[i]);

PyModule_AddObject(m, name+1, (PyObject *)typelist[i]);

}

cpython/Modules/_functoolsmodule.c at 2.7 · python-emscripten/cpython · GitHub

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