1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/* Range object implementation */
#include "Python.h"
typedef struct {
PyObject_HEAD
long start;
long step;
long len;
int reps;
} rangeobject;
PyObject *
PyRange_New(long start, long len, long step, int reps)
{
rangeobject *obj = PyObject_NEW(rangeobject, &PyRange_Type);
obj->start = start;
obj->len = len;
obj->step = step;
obj->reps = reps;
return (PyObject *) obj;
}
static void
range_dealloc(rangeobject *r)
{
PyObject_DEL(r);
}
static PyObject *
range_item(rangeobject *r, int i)
{
if (i < 0 || i >= r->len * r->reps) {
PyErr_SetString(PyExc_IndexError,
"xrange object index out of range");
return NULL;
}
return PyInt_FromLong(r->start + (i % r->len) * r->step);
}
static int
range_length(rangeobject *r)
{
return r->len * r->reps;
}
static PyObject *
range_repr(rangeobject *r)
{
/* buffers must be big enough to hold 3 longs + an int +
* a bit of "(xrange(...) * ...)" text.
*/
char buf1[250];
char buf2[250];
if (r->start == 0 && r->step == 1)
sprintf(buf1, "xrange(%ld)", r->start + r->len * r->step);
else if (r->step == 1)
sprintf(buf1, "xrange(%ld, %ld)",
r->start,
r->start + r->len * r->step);
else
sprintf(buf1, "xrange(%ld, %ld, %ld)",
r->start,
r->start + r->len * r->step,
r->step);
if (r->reps != 1)
sprintf(buf2, "(%s * %d)", buf1, r->reps);
return PyString_FromString(r->reps == 1 ? buf1 : buf2);
}
static PyObject *
range_concat(rangeobject *r, PyObject *obj)
{
PyErr_SetString(PyExc_TypeError, "cannot concatenate xrange objects");
return NULL;
}
static PyObject *
range_repeat(rangeobject *r, int n)
{
if (n < 0)
return (PyObject *) PyRange_New(0, 0, 1, 1);
else if (n == 1) {
Py_INCREF(r);
return (PyObject *) r;
}
else
return (PyObject *) PyRange_New(
r->start,
r->len,
r->step,
r->reps * n);
}
static int
range_compare(rangeobject *r1, rangeobject *r2)
{
if (r1->start != r2->start)
return r1->start - r2->start;
else if (r1->step != r2->step)
return r1->step - r2->step;
else if (r1->len != r2->len)
return r1->len - r2->len;
else
return r1->reps - r2->reps;
}
static PyObject *
range_slice(rangeobject *r, int low, int high)
{
if (r->reps != 1) {
PyErr_SetString(PyExc_TypeError,
"cannot slice a replicated xrange");
return NULL;
}
if (low < 0)
low = 0;
else if (low > r->len)
low = r->len;
if (high < 0)
high = 0;
if (high < low)
high = low;
else if (high > r->len)
high = r->len;
if (low == 0 && high == r->len) {
Py_INCREF(r);
return (PyObject *) r;
}
return (PyObject *) PyRange_New(
low * r->step + r->start,
high - low,
r->step,
1);
}
static PyObject *
range_tolist(rangeobject *self, PyObject *args)
{
PyObject *thelist;
int j;
int len = self->len * self->reps;
if (! PyArg_ParseTuple(args, ":tolist"))
return NULL;
if ((thelist = PyList_New(len)) == NULL)
return NULL;
for (j = 0; j < len; ++j)
if ((PyList_SetItem(thelist, j, (PyObject *) PyInt_FromLong(
self->start + (j % self->len) * self->step))) < 0)
return NULL;
return thelist;
}
static PyObject *
range_getattr(rangeobject *r, char *name)
{
static PyMethodDef range_methods[] = {
{"tolist", (PyCFunction)range_tolist, METH_VARARGS,
"tolist() -> list\n"
"Return a list object with the same values."},
{NULL, NULL}
};
return Py_FindMethod(range_methods, (PyObject *) r, name);
}
static int
range_contains(rangeobject *r, PyObject *obj)
{
long num = PyInt_AsLong(obj);
if (num < 0 && PyErr_Occurred())
return -1;
if ((num < r->start) || ((num - r->start) % r->step))
return 0;
if (num >= (r->start + (r->len * r->step)))
return 0;
return 1;
}
static PySequenceMethods range_as_sequence = {
(inquiry)range_length, /*sq_length*/
(binaryfunc)range_concat, /*sq_concat*/
(intargfunc)range_repeat, /*sq_repeat*/
(intargfunc)range_item, /*sq_item*/
(intintargfunc)range_slice, /*sq_slice*/
0, /*sq_ass_item*/
0, /*sq_ass_slice*/
(objobjproc)range_contains, /*sq_contains*/
};
PyTypeObject PyRange_Type = {
PyObject_HEAD_INIT(&PyType_Type)
0, /* Number of items for varobject */
"xrange", /* Name of this type */
sizeof(rangeobject), /* Basic object size */
0, /* Item size for varobject */
(destructor)range_dealloc, /*tp_dealloc*/
0, /*tp_print*/
(getattrfunc)range_getattr, /*tp_getattr*/
0, /*tp_setattr*/
(cmpfunc)range_compare, /*tp_compare*/
(reprfunc)range_repr, /*tp_repr*/
0, /*tp_as_number*/
&range_as_sequence, /*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*/
};
|
