mirror of
https://github.com/python/cpython.git
synced 2024-11-30 21:34:17 +08:00
286 lines
6.8 KiB
C
286 lines
6.8 KiB
C
/* Implementation helper: a struct that looks like a tuple. See timemodule
|
|
and posixmodule for example uses. */
|
|
|
|
#include "Python.h"
|
|
#include "structmember.h"
|
|
#include "structseq.h"
|
|
|
|
static char visible_length_key[] = "n_sequence_fields";
|
|
static char real_length_key[] = "n_fields";
|
|
|
|
#define VISIBLE_SIZE(op) ((op)->ob_size)
|
|
#define VISIBLE_SIZE_TP(tp) PyInt_AsLong( \
|
|
PyDict_GetItemString((tp)->tp_dict, visible_length_key))
|
|
|
|
#define REAL_SIZE_TP(tp) PyInt_AsLong( \
|
|
PyDict_GetItemString((tp)->tp_dict, real_length_key))
|
|
#define REAL_SIZE(op) REAL_SIZE_TP((op)->ob_type)
|
|
|
|
|
|
PyObject *
|
|
PyStructSequence_New(PyTypeObject *type)
|
|
{
|
|
PyStructSequence *obj;
|
|
|
|
obj = PyObject_New(PyStructSequence, type);
|
|
obj->ob_size = VISIBLE_SIZE_TP(type);
|
|
|
|
return (PyObject*) obj;
|
|
}
|
|
|
|
static void
|
|
structseq_dealloc(PyStructSequence *obj)
|
|
{
|
|
int i, size;
|
|
|
|
size = REAL_SIZE(obj);
|
|
for (i = 0; i < size; ++i) {
|
|
Py_XDECREF(obj->ob_item[i]);
|
|
}
|
|
PyObject_FREE(obj);
|
|
}
|
|
|
|
static int
|
|
structseq_length(PyStructSequence *obj)
|
|
{
|
|
return VISIBLE_SIZE(obj);
|
|
}
|
|
|
|
static PyObject*
|
|
structseq_item(PyStructSequence *obj, int i)
|
|
{
|
|
if (i < 0 || i >= VISIBLE_SIZE(obj)) {
|
|
PyErr_SetString(PyExc_IndexError, "tuple index out of range");
|
|
return NULL;
|
|
}
|
|
Py_INCREF(obj->ob_item[i]);
|
|
return obj->ob_item[i];
|
|
}
|
|
|
|
static PyObject*
|
|
structseq_slice(PyStructSequence *obj, int low, int high)
|
|
{
|
|
PyTupleObject *np;
|
|
int i;
|
|
|
|
if (low < 0)
|
|
low = 0;
|
|
if (high > VISIBLE_SIZE(obj))
|
|
high = VISIBLE_SIZE(obj);
|
|
if (high < low)
|
|
high = low;
|
|
np = (PyTupleObject *)PyTuple_New(high-low);
|
|
if (np == NULL)
|
|
return NULL;
|
|
for(i = low; i < high; ++i) {
|
|
PyObject *v = obj->ob_item[i];
|
|
Py_INCREF(v);
|
|
PyTuple_SET_ITEM(np, i-low, v);
|
|
}
|
|
return (PyObject *) np;
|
|
}
|
|
|
|
static PyObject *
|
|
structseq_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
|
|
{
|
|
PyObject *arg = NULL;
|
|
PyStructSequence *res = NULL;
|
|
int len, required_len, i;
|
|
static char *kwlist[] = {"sequence", 0};
|
|
static char msgbuf[128];
|
|
|
|
if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:structseq",
|
|
kwlist, &arg))
|
|
return NULL;
|
|
|
|
if (!PySequence_Check(arg)) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"constructor requires a sequence");
|
|
return NULL;
|
|
}
|
|
|
|
len = PySequence_Length(arg);
|
|
required_len = REAL_SIZE_TP(type);
|
|
if (len != required_len) {
|
|
PyOS_snprintf(
|
|
msgbuf, sizeof(msgbuf),
|
|
"constructor takes exactly %d arguments (%d given)",
|
|
required_len,
|
|
len);
|
|
PyErr_SetString(PyExc_TypeError, msgbuf);
|
|
return NULL;
|
|
}
|
|
|
|
res = (PyStructSequence*) PyStructSequence_New(type);
|
|
for (i = 0; i < len; ++i) {
|
|
/* INCREF???? XXXX */
|
|
res->ob_item[i] = PySequence_GetItem(arg, i);
|
|
}
|
|
|
|
return (PyObject*) res;
|
|
}
|
|
|
|
static PyObject *
|
|
make_tuple(PyStructSequence *obj)
|
|
{
|
|
return structseq_slice(obj, 0, VISIBLE_SIZE(obj));
|
|
}
|
|
|
|
static PyObject *
|
|
structseq_repr(PyStructSequence *obj)
|
|
{
|
|
PyObject *tup, *str;
|
|
tup = make_tuple(obj);
|
|
str = PyObject_Repr(tup);
|
|
Py_DECREF(tup);
|
|
return str;
|
|
}
|
|
|
|
static PyObject *
|
|
structseq_concat(PyStructSequence *obj, PyObject *b)
|
|
{
|
|
PyObject *tup, *result;
|
|
tup = make_tuple(obj);
|
|
result = PySequence_Concat(tup, b);
|
|
Py_DECREF(tup);
|
|
return result;
|
|
}
|
|
|
|
static PyObject *
|
|
structseq_repeat(PyStructSequence *obj, int n)
|
|
{
|
|
PyObject *tup, *result;
|
|
tup = make_tuple(obj);
|
|
result = PySequence_Repeat(tup, n);
|
|
Py_DECREF(tup);
|
|
return result;
|
|
}
|
|
|
|
static int
|
|
structseq_contains(PyStructSequence *obj, PyObject *o)
|
|
{
|
|
PyObject *tup;
|
|
int result;
|
|
tup = make_tuple(obj);
|
|
result = PySequence_Contains(tup, o);
|
|
Py_DECREF(tup);
|
|
return result;
|
|
}
|
|
|
|
static long
|
|
structseq_hash(PyObject *obj)
|
|
{
|
|
PyObject *tup;
|
|
long result;
|
|
tup = make_tuple((PyStructSequence*) obj);
|
|
result = PyObject_Hash(tup);
|
|
Py_DECREF(tup);
|
|
return result;
|
|
}
|
|
|
|
static PyObject *
|
|
structseq_richcompare(PyObject *obj, PyObject *o2, int op)
|
|
{
|
|
PyObject *tup, *result;
|
|
tup = make_tuple((PyStructSequence*) obj);
|
|
result = PyObject_RichCompare(tup, o2, op);
|
|
Py_DECREF(tup);
|
|
return result;
|
|
}
|
|
|
|
static PySequenceMethods structseq_as_sequence = {
|
|
(inquiry)structseq_length,
|
|
(binaryfunc)structseq_concat, /* sq_concat */
|
|
(intargfunc)structseq_repeat, /* sq_repeat */
|
|
(intargfunc)structseq_item, /* sq_item */
|
|
(intintargfunc)structseq_slice, /* sq_slice */
|
|
0, /* sq_ass_item */
|
|
0, /* sq_ass_slice */
|
|
(objobjproc)structseq_contains, /* sq_contains */
|
|
};
|
|
|
|
static PyTypeObject _struct_sequence_template = {
|
|
PyObject_HEAD_INIT(&PyType_Type)
|
|
0, /* ob_size */
|
|
NULL, /* tp_name */
|
|
0, /* tp_basicsize */
|
|
0, /* tp_itemsize */
|
|
(destructor)structseq_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_compare */
|
|
(reprfunc)structseq_repr, /* tp_repr */
|
|
0, /* tp_as_number */
|
|
&structseq_as_sequence, /* tp_as_sequence */
|
|
0, /* tp_as_mapping */
|
|
(hashfunc)structseq_hash, /* tp_hash */
|
|
0, /* tp_call */
|
|
0, /* tp_str */
|
|
0, /* tp_getattro */
|
|
0, /* tp_setattro */
|
|
0, /* tp_as_buffer */
|
|
Py_TPFLAGS_DEFAULT, /* tp_flags */
|
|
NULL, /* tp_doc */
|
|
0, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
structseq_richcompare, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
0, /* tp_iter */
|
|
0, /* tp_iternext */
|
|
0, /* tp_methods */
|
|
NULL, /* tp_members */
|
|
0, /* tp_getset */
|
|
0, /* tp_base */
|
|
0, /* tp_dict */
|
|
0, /* tp_descr_get */
|
|
0, /* tp_descr_set */
|
|
0, /* tp_dictoffset */
|
|
0, /* tp_init */
|
|
0, /* tp_alloc */
|
|
structseq_new, /* tp_new */
|
|
};
|
|
|
|
void
|
|
PyStructSequence_InitType(PyTypeObject *type, PyStructSequence_Desc *desc)
|
|
{
|
|
PyObject *dict;
|
|
PyMemberDef* members;
|
|
int n_members, i;
|
|
|
|
for (i = 0; desc->fields[i].name != NULL; ++i)
|
|
;
|
|
n_members = i;
|
|
|
|
memcpy(type, &_struct_sequence_template, sizeof(PyTypeObject));
|
|
type->tp_name = desc->name;
|
|
type->tp_doc = desc->doc;
|
|
type->tp_basicsize = sizeof(PyStructSequence)+
|
|
sizeof(PyObject*)*(n_members-1);
|
|
type->tp_itemsize = 0;
|
|
|
|
members = PyMem_NEW(PyMemberDef, n_members+1);
|
|
|
|
for (i = 0; i < n_members; ++i) {
|
|
members[i].name = desc->fields[i].name;
|
|
members[i].type = T_OBJECT;
|
|
members[i].offset = offsetof(PyStructSequence, ob_item)
|
|
+ i * sizeof(PyObject*);
|
|
members[i].flags = READONLY;
|
|
members[i].doc = desc->fields[i].doc;
|
|
}
|
|
members[n_members].name = NULL;
|
|
|
|
type->tp_members = members;
|
|
|
|
if (PyType_Ready(type) < 0)
|
|
return;
|
|
Py_INCREF(type);
|
|
|
|
dict = type->tp_dict;
|
|
PyDict_SetItemString(dict, visible_length_key,
|
|
PyInt_FromLong((long) desc->n_in_sequence));
|
|
PyDict_SetItemString(dict, real_length_key,
|
|
PyInt_FromLong((long) n_members));
|
|
}
|