mirror of
https://github.com/python/cpython.git
synced 2024-11-25 10:54:51 +08:00
383 lines
9.0 KiB
C
383 lines
9.0 KiB
C
/* Implementation helper: a struct that looks like a tuple. See timemodule
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and posixmodule for example uses. */
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#include "Python.h"
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#include "structmember.h"
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#include "structseq.h"
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static char visible_length_key[] = "n_sequence_fields";
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static char real_length_key[] = "n_fields";
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/* Fields with this name have only a field index, not a field name.
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They are only allowed for indices < n_visible_fields. */
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char *PyStructSequence_UnnamedField = "unnamed field";
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#define VISIBLE_SIZE(op) ((op)->ob_size)
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#define VISIBLE_SIZE_TP(tp) PyInt_AsLong( \
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PyDict_GetItemString((tp)->tp_dict, visible_length_key))
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#define REAL_SIZE_TP(tp) PyInt_AsLong( \
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PyDict_GetItemString((tp)->tp_dict, real_length_key))
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#define REAL_SIZE(op) REAL_SIZE_TP((op)->ob_type)
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PyObject *
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PyStructSequence_New(PyTypeObject *type)
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{
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PyStructSequence *obj;
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obj = PyObject_New(PyStructSequence, type);
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obj->ob_size = VISIBLE_SIZE_TP(type);
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return (PyObject*) obj;
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}
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static void
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structseq_dealloc(PyStructSequence *obj)
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{
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int i, size;
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size = REAL_SIZE(obj);
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for (i = 0; i < size; ++i) {
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Py_XDECREF(obj->ob_item[i]);
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}
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PyObject_Del(obj);
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}
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static int
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structseq_length(PyStructSequence *obj)
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{
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return VISIBLE_SIZE(obj);
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}
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static PyObject*
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structseq_item(PyStructSequence *obj, int i)
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{
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if (i < 0 || i >= VISIBLE_SIZE(obj)) {
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PyErr_SetString(PyExc_IndexError, "tuple index out of range");
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return NULL;
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}
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Py_INCREF(obj->ob_item[i]);
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return obj->ob_item[i];
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}
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static PyObject*
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structseq_slice(PyStructSequence *obj, int low, int high)
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{
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PyTupleObject *np;
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int i;
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if (low < 0)
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low = 0;
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if (high > VISIBLE_SIZE(obj))
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high = VISIBLE_SIZE(obj);
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if (high < low)
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high = low;
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np = (PyTupleObject *)PyTuple_New(high-low);
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if (np == NULL)
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return NULL;
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for(i = low; i < high; ++i) {
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PyObject *v = obj->ob_item[i];
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Py_INCREF(v);
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PyTuple_SET_ITEM(np, i-low, v);
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}
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return (PyObject *) np;
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}
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static PyObject *
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structseq_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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{
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PyObject *arg = NULL;
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PyObject *dict = NULL;
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PyObject *ob;
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PyStructSequence *res = NULL;
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int len, min_len, max_len, i;
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static char *kwlist[] = {"sequence", "dict", 0};
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if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:structseq",
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kwlist, &arg, &dict))
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return NULL;
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arg = PySequence_Fast(arg, "constructor requires a sequence");
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if (!arg) {
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return NULL;
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}
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if (dict && !PyDict_Check(dict)) {
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PyErr_Format(PyExc_TypeError,
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"%.500s() takes a dict as second arg, if any",
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type->tp_name);
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Py_DECREF(arg);
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return NULL;
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}
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len = PySequence_Fast_GET_SIZE(arg);
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min_len = VISIBLE_SIZE_TP(type);
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max_len = REAL_SIZE_TP(type);
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if (min_len != max_len) {
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if (len < min_len) {
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PyErr_Format(PyExc_TypeError,
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"%.500s() takes an at least %d-sequence (%d-sequence given)",
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type->tp_name, min_len, len);
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Py_DECREF(arg);
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return NULL;
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}
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if (len > max_len) {
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PyErr_Format(PyExc_TypeError,
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"%.500s() takes an at most %d-sequence (%d-sequence given)",
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type->tp_name, max_len, len);
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Py_DECREF(arg);
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return NULL;
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}
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}
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else {
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if (len != min_len) {
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PyErr_Format(PyExc_TypeError,
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"%.500s() takes a %d-sequence (%d-sequence given)",
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type->tp_name, min_len, len);
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Py_DECREF(arg);
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return NULL;
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}
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}
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res = (PyStructSequence*) PyStructSequence_New(type);
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for (i = 0; i < len; ++i) {
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PyObject *v = PySequence_Fast_GET_ITEM(arg, i);
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Py_INCREF(v);
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res->ob_item[i] = v;
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}
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for (; i < max_len; ++i) {
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if (dict && (ob = PyDict_GetItemString(
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dict, type->tp_members[i].name))) {
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}
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else {
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ob = Py_None;
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}
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Py_INCREF(ob);
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res->ob_item[i] = ob;
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}
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Py_DECREF(arg);
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return (PyObject*) res;
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}
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static PyObject *
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make_tuple(PyStructSequence *obj)
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{
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return structseq_slice(obj, 0, VISIBLE_SIZE(obj));
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}
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static PyObject *
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structseq_repr(PyStructSequence *obj)
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{
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PyObject *tup, *str;
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tup = make_tuple(obj);
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str = PyObject_Repr(tup);
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Py_DECREF(tup);
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return str;
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}
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static PyObject *
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structseq_concat(PyStructSequence *obj, PyObject *b)
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{
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PyObject *tup, *result;
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tup = make_tuple(obj);
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result = PySequence_Concat(tup, b);
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Py_DECREF(tup);
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return result;
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}
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static PyObject *
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structseq_repeat(PyStructSequence *obj, int n)
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{
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PyObject *tup, *result;
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tup = make_tuple(obj);
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result = PySequence_Repeat(tup, n);
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Py_DECREF(tup);
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return result;
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}
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static int
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structseq_contains(PyStructSequence *obj, PyObject *o)
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{
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PyObject *tup;
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int result;
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tup = make_tuple(obj);
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result = PySequence_Contains(tup, o);
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Py_DECREF(tup);
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return result;
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}
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static long
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structseq_hash(PyObject *obj)
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{
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PyObject *tup;
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long result;
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tup = make_tuple((PyStructSequence*) obj);
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result = PyObject_Hash(tup);
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Py_DECREF(tup);
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return result;
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}
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static PyObject *
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structseq_richcompare(PyObject *obj, PyObject *o2, int op)
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{
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PyObject *tup, *result;
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tup = make_tuple((PyStructSequence*) obj);
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result = PyObject_RichCompare(tup, o2, op);
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Py_DECREF(tup);
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return result;
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}
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static PyObject *
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structseq_reduce(PyStructSequence* self)
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{
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PyObject* tup;
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PyObject* dict;
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PyObject* result;
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long n_fields, n_visible_fields;
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int i;
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n_fields = REAL_SIZE(self);
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n_visible_fields = VISIBLE_SIZE(self);
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tup = PyTuple_New(n_visible_fields);
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if (!tup) {
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return NULL;
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}
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dict = PyDict_New();
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if (!dict) {
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Py_DECREF(tup);
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return NULL;
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}
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for (i = 0; i < n_visible_fields; i++) {
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Py_INCREF(self->ob_item[i]);
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PyTuple_SET_ITEM(tup, i, self->ob_item[i]);
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}
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for (; i < n_fields; i++) {
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PyDict_SetItemString(dict, self->ob_type->tp_members[i].name,
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self->ob_item[i]);
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}
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result = Py_BuildValue("(O(OO))", self->ob_type, tup, dict);
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Py_DECREF(tup);
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Py_DECREF(dict);
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return result;
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}
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static PySequenceMethods structseq_as_sequence = {
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(inquiry)structseq_length,
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(binaryfunc)structseq_concat, /* sq_concat */
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(intargfunc)structseq_repeat, /* sq_repeat */
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(intargfunc)structseq_item, /* sq_item */
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(intintargfunc)structseq_slice, /* sq_slice */
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0, /* sq_ass_item */
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0, /* sq_ass_slice */
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(objobjproc)structseq_contains, /* sq_contains */
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};
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static PyMethodDef structseq_methods[] = {
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{"__reduce__", (PyCFunction)structseq_reduce,
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METH_NOARGS, NULL},
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{NULL, NULL}
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};
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static PyTypeObject _struct_sequence_template = {
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PyObject_HEAD_INIT(&PyType_Type)
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0, /* ob_size */
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NULL, /* tp_name */
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0, /* tp_basicsize */
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0, /* tp_itemsize */
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(destructor)structseq_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_compare */
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(reprfunc)structseq_repr, /* tp_repr */
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0, /* tp_as_number */
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&structseq_as_sequence, /* tp_as_sequence */
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0, /* tp_as_mapping */
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(hashfunc)structseq_hash, /* tp_hash */
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0, /* tp_call */
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0, /* tp_str */
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0, /* tp_getattro */
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0, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT, /* tp_flags */
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NULL, /* tp_doc */
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0, /* tp_traverse */
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0, /* tp_clear */
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structseq_richcompare, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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structseq_methods, /* tp_methods */
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NULL, /* tp_members */
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0, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
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0, /* tp_descr_get */
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0, /* tp_descr_set */
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0, /* tp_dictoffset */
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0, /* tp_init */
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0, /* tp_alloc */
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structseq_new, /* tp_new */
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};
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void
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PyStructSequence_InitType(PyTypeObject *type, PyStructSequence_Desc *desc)
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{
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PyObject *dict;
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PyMemberDef* members;
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int n_members, n_unnamed_members, i, k;
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n_unnamed_members = 0;
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for (i = 0; desc->fields[i].name != NULL; ++i)
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if (desc->fields[0].name == PyStructSequence_UnnamedField)
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n_unnamed_members++;
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n_members = i;
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memcpy(type, &_struct_sequence_template, sizeof(PyTypeObject));
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type->tp_name = desc->name;
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type->tp_doc = desc->doc;
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type->tp_basicsize = sizeof(PyStructSequence)+
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sizeof(PyObject*)*(n_members-1);
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type->tp_itemsize = 0;
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members = PyMem_NEW(PyMemberDef, n_members-n_unnamed_members+1);
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for (i = k = 0; i < n_members; ++i) {
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if (desc->fields[i].name == PyStructSequence_UnnamedField)
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continue;
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members[k].name = desc->fields[i].name;
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members[k].type = T_OBJECT;
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members[k].offset = offsetof(PyStructSequence, ob_item)
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+ i * sizeof(PyObject*);
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members[k].flags = READONLY;
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members[k].doc = desc->fields[i].doc;
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k++;
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}
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members[k].name = NULL;
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type->tp_members = members;
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if (PyType_Ready(type) < 0)
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return;
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Py_INCREF(type);
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dict = type->tp_dict;
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PyDict_SetItemString(dict, visible_length_key,
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PyInt_FromLong((long) desc->n_in_sequence));
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PyDict_SetItemString(dict, real_length_key,
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PyInt_FromLong((long) n_members));
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PyDict_SetItemString(dict, "__safe_for_unpickling__",
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PyInt_FromLong(1));
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}
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