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make struct sequences subclass tuple; kill lots of code 

This fixes #8413.
This commit is contained in:
Benjamin Peterson 2010-07-07 20:54:01 +00:00
parent a9800a8d5b
commit ccabcd4bd4
3 changed files with 23 additions and 215 deletions
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11
Include/structseq.h
View File

@ -26,17 +26,12 @@ PyAPI_FUNC(void) PyStructSequence_InitType(PyTypeObject *type,
PyAPI_FUNC(PyObject *) PyStructSequence_New(PyTypeObject* type);
typedef struct {
PyObject_VAR_HEAD
PyObject *ob_item[1];
} PyStructSequence;
typedef PyTupleObject PyStructSequence;
/* Macro, *only* to be used to fill in brand new objects */
#define PyStructSequence_SET_ITEM(op, i, v) \
(((PyStructSequence *)(op))->ob_item[i] = v)
#define PyStructSequence_SET_ITEM(op, i, v) PyTuple_SET_ITEM(op, i, v)
#define PyStructSequence_GET_ITEM(op, i) \
(((PyStructSequence *)(op))->ob_item[i])
#define PyStructSequence_GET_ITEM(op, i) PyTuple_GET_ITEM(op, i)
#ifdef __cplusplus

2
Misc/NEWS
View File

@ -12,6 +12,8 @@ What's New in Python 3.2 Alpha 1?
Core and Builtins
-----------------
- Issue #8413: structsequence now subclasses tuple.
- Issue #8271: during the decoding of an invalid UTF-8 byte sequence, only the
start byte and the continuation byte(s) are now considered invalid, instead
of the number of bytes specified by the start byte.

225
Objects/structseq.c
View File

@ -30,113 +30,15 @@ PyObject *
PyStructSequence_New(PyTypeObject *type)
{
PyStructSequence *obj;
Py_ssize_t size = REAL_SIZE_TP(type), i;
obj = PyObject_New(PyStructSequence, type);
obj = PyObject_GC_NewVar(PyStructSequence, type, size);
if (obj == NULL)
return NULL;
Py_SIZE(obj) = VISIBLE_SIZE_TP(type);
for (i = 0; i < size; i++)
obj->ob_item[i] = NULL;
return (PyObject*) obj;
}
static void
structseq_dealloc(PyStructSequence *obj)
{
Py_ssize_t i, size;
size = REAL_SIZE(obj);
for (i = 0; i < size; ++i) {
Py_XDECREF(obj->ob_item[i]);
}
PyObject_Del(obj);
}
static Py_ssize_t
structseq_length(PyStructSequence *obj)
{
return VISIBLE_SIZE(obj);
}
static PyObject*
structseq_item(PyStructSequence *obj, Py_ssize_t 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, Py_ssize_t low, Py_ssize_t high)
{
PyTupleObject *np;
Py_ssize_t 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_subscript(PyStructSequence *self, PyObject *item)
{
if (PyIndex_Check(item)) {
Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
if (i == -1 && PyErr_Occurred())
return NULL;
if (i < 0)
i += VISIBLE_SIZE(self);
if (i < 0 || i >= VISIBLE_SIZE(self)) {
PyErr_SetString(PyExc_IndexError,
"tuple index out of range");
return NULL;
}
Py_INCREF(self->ob_item[i]);
return self->ob_item[i];
}
else if (PySlice_Check(item)) {
Py_ssize_t start, stop, step, slicelen, cur, i;
PyObject *result;
if (PySlice_GetIndicesEx((PySliceObject *)item,
VISIBLE_SIZE(self), &start, &stop,
&step, &slicelen) < 0) {
return NULL;
}
if (slicelen <= 0)
return PyTuple_New(0);
result = PyTuple_New(slicelen);
if (result == NULL)
return NULL;
for (cur = start, i = 0; i < slicelen;
cur += step, i++) {
PyObject *v = self->ob_item[cur];
Py_INCREF(v);
PyTuple_SET_ITEM(result, i, v);
}
return result;
}
else {
PyErr_SetString(PyExc_TypeError,
"structseq index must be integer");
return NULL;
}
return (PyObject*)obj;
}
static PyObject *
@ -223,11 +125,6 @@ structseq_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
return (PyObject*) res;
}
static PyObject *
make_tuple(PyStructSequence *obj)
{
return structseq_slice(obj, 0, VISIBLE_SIZE(obj));
}
static PyObject *
structseq_repr(PyStructSequence *obj)
@ -236,7 +133,6 @@ structseq_repr(PyStructSequence *obj)
#define REPR_BUFFER_SIZE 512
#define TYPE_MAXSIZE 100
PyObject *tup;
PyTypeObject *typ = Py_TYPE(obj);
int i, removelast = 0;
Py_ssize_t len;
@ -246,10 +142,6 @@ structseq_repr(PyStructSequence *obj)
/* pointer to end of writeable buffer; safes space for "...)\0" */
endofbuf= &buf[REPR_BUFFER_SIZE-5];
if ((tup = make_tuple(obj)) == NULL) {
return NULL;
}
/* "typename(", limited to TYPE_MAXSIZE */
len = strlen(typ->tp_name) > TYPE_MAXSIZE ? TYPE_MAXSIZE :
strlen(typ->tp_name);
@ -262,19 +154,14 @@ structseq_repr(PyStructSequence *obj)
char *cname, *crepr;
cname = typ->tp_members[i].name;
val = PyTuple_GetItem(tup, i);
if (cname == NULL || val == NULL) {
if (cname == NULL)
return NULL;
}
val = PyStructSequence_GET_ITEM(obj, i);
repr = PyObject_Repr(val);
if (repr == NULL) {
Py_DECREF(tup);
if (repr == NULL)
return NULL;
}
crepr = _PyUnicode_AsString(repr);
if (crepr == NULL) {
Py_DECREF(tup);
Py_DECREF(repr);
return NULL;
}
@ -300,7 +187,6 @@ structseq_repr(PyStructSequence *obj)
break;
}
}
Py_DECREF(tup);
if (removelast) {
/* overwrite last ", " */
pbuf-=2;
@ -311,62 +197,6 @@ structseq_repr(PyStructSequence *obj)
return PyUnicode_FromString(buf);
}
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, Py_ssize_t 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);
if (!tup)
return -1;
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);
if (!tup)
return -1;
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 PyObject *
structseq_reduce(PyStructSequence* self)
{
@ -409,53 +239,36 @@ structseq_reduce(PyStructSequence* self)
return result;
}
static PySequenceMethods structseq_as_sequence = {
(lenfunc)structseq_length,
(binaryfunc)structseq_concat, /* sq_concat */
(ssizeargfunc)structseq_repeat, /* sq_repeat */
(ssizeargfunc)structseq_item, /* sq_item */
0, /* sq_slice */
0, /* sq_ass_item */
0, /* sq_ass_slice */
(objobjproc)structseq_contains, /* sq_contains */
};
static PyMappingMethods structseq_as_mapping = {
(lenfunc)structseq_length,
(binaryfunc)structseq_subscript,
};
static PyMethodDef structseq_methods[] = {
{"__reduce__", (PyCFunction)structseq_reduce,
METH_NOARGS, NULL},
{"__reduce__", (PyCFunction)structseq_reduce, METH_NOARGS, NULL},
{NULL, NULL}
};
static PyTypeObject _struct_sequence_template = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
NULL, /* tp_name */
0, /* tp_basicsize */
0, /* tp_itemsize */
(destructor)structseq_dealloc, /* tp_dealloc */
sizeof(PyStructSequence) - sizeof(PyObject *), /* tp_basicsize */
sizeof(PyObject *), /* tp_itemsize */
0, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
(reprfunc)structseq_repr, /* tp_repr */
0, /* tp_as_number */
&structseq_as_sequence, /* tp_as_sequence */
&structseq_as_mapping, /* tp_as_mapping */
structseq_hash, /* tp_hash */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
Py_TPFLAGS_DEFAULT, /* tp_flags */
NULL, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
structseq_richcompare, /* tp_richcompare */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
@ -494,11 +307,9 @@ PyStructSequence_InitType(PyTypeObject *type, PyStructSequence_Desc *desc)
n_members = i;
memcpy(type, &_struct_sequence_template, sizeof(PyTypeObject));
type->tp_base = &PyTuple_Type;
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-n_unnamed_members+1);
if (members == NULL)