Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 1 | |
| 2 | /* Range object implementation */ |
| 3 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 4 | #include "Python.h" |
Fred Drake | 0b796fa | 2000-11-08 19:42:43 +0000 | [diff] [blame] | 5 | #include "structmember.h" |
| 6 | #include <string.h> |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 7 | |
| 8 | typedef struct { |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 9 | PyObject_HEAD |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 10 | long start; |
| 11 | long step; |
| 12 | long len; |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 13 | } rangeobject; |
| 14 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 15 | PyObject * |
Guido van Rossum | 3f56166 | 2001-07-05 13:27:48 +0000 | [diff] [blame^] | 16 | PyRange_New(long start, long len, long step) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 17 | { |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 18 | rangeobject *obj = PyObject_NEW(rangeobject, &PyRange_Type); |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 19 | |
Guido van Rossum | 9e8f4ea | 2000-12-14 14:59:53 +0000 | [diff] [blame] | 20 | if (obj == NULL) |
| 21 | return NULL; |
| 22 | |
Guido van Rossum | 3f56166 | 2001-07-05 13:27:48 +0000 | [diff] [blame^] | 23 | if (len == 0) { |
Guido van Rossum | 65e0b99 | 2001-01-15 18:58:56 +0000 | [diff] [blame] | 24 | start = 0; |
| 25 | len = 0; |
| 26 | step = 1; |
Guido van Rossum | 65e0b99 | 2001-01-15 18:58:56 +0000 | [diff] [blame] | 27 | } |
| 28 | else { |
| 29 | long last = start + (len - 1) * step; |
| 30 | if ((step > 0) ? |
| 31 | (last > (PyInt_GetMax() - step)) |
| 32 | :(last < (-1 - PyInt_GetMax() - step))) { |
| 33 | PyErr_SetString(PyExc_OverflowError, |
| 34 | "integer addition"); |
| 35 | return NULL; |
Guido van Rossum | 65e0b99 | 2001-01-15 18:58:56 +0000 | [diff] [blame] | 36 | } |
| 37 | } |
| 38 | |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 39 | obj->start = start; |
| 40 | obj->len = len; |
| 41 | obj->step = step; |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 42 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 43 | return (PyObject *) obj; |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 44 | } |
| 45 | |
| 46 | static void |
Fred Drake | 45cfbcc | 2000-07-09 06:21:27 +0000 | [diff] [blame] | 47 | range_dealloc(rangeobject *r) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 48 | { |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 49 | PyObject_DEL(r); |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 50 | } |
| 51 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 52 | static PyObject * |
Fred Drake | 45cfbcc | 2000-07-09 06:21:27 +0000 | [diff] [blame] | 53 | range_item(rangeobject *r, int i) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 54 | { |
Guido van Rossum | 3f56166 | 2001-07-05 13:27:48 +0000 | [diff] [blame^] | 55 | if (i < 0 || i >= r->len) { |
| 56 | PyErr_SetString(PyExc_IndexError, |
Guido van Rossum | 5dadf7e | 1999-01-09 21:40:35 +0000 | [diff] [blame] | 57 | "xrange object index out of range"); |
Guido van Rossum | 3f56166 | 2001-07-05 13:27:48 +0000 | [diff] [blame^] | 58 | return NULL; |
| 59 | } |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 60 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 61 | return PyInt_FromLong(r->start + (i % r->len) * r->step); |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 62 | } |
| 63 | |
| 64 | static int |
Fred Drake | 45cfbcc | 2000-07-09 06:21:27 +0000 | [diff] [blame] | 65 | range_length(rangeobject *r) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 66 | { |
Guido van Rossum | 3f56166 | 2001-07-05 13:27:48 +0000 | [diff] [blame^] | 67 | return r->len; |
Guido van Rossum | 7d6aa51 | 1993-12-21 22:50:31 +0000 | [diff] [blame] | 68 | } |
| 69 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 70 | static PyObject * |
Fred Drake | 45cfbcc | 2000-07-09 06:21:27 +0000 | [diff] [blame] | 71 | range_repr(rangeobject *r) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 72 | { |
Tim Peters | 72d421b | 2000-08-04 03:05:40 +0000 | [diff] [blame] | 73 | /* buffers must be big enough to hold 3 longs + an int + |
| 74 | * a bit of "(xrange(...) * ...)" text. |
| 75 | */ |
| 76 | char buf1[250]; |
Fred Drake | 2b83b46 | 2000-08-03 17:43:02 +0000 | [diff] [blame] | 77 | |
Tim Peters | 72d421b | 2000-08-04 03:05:40 +0000 | [diff] [blame] | 78 | if (r->start == 0 && r->step == 1) |
Fred Drake | c76e0e5 | 2000-08-04 02:34:41 +0000 | [diff] [blame] | 79 | sprintf(buf1, "xrange(%ld)", r->start + r->len * r->step); |
Tim Peters | 72d421b | 2000-08-04 03:05:40 +0000 | [diff] [blame] | 80 | |
| 81 | else if (r->step == 1) |
| 82 | sprintf(buf1, "xrange(%ld, %ld)", |
| 83 | r->start, |
| 84 | r->start + r->len * r->step); |
| 85 | |
| 86 | else |
| 87 | sprintf(buf1, "xrange(%ld, %ld, %ld)", |
Fred Drake | c76e0e5 | 2000-08-04 02:34:41 +0000 | [diff] [blame] | 88 | r->start, |
| 89 | r->start + r->len * r->step, |
| 90 | r->step); |
Tim Peters | 72d421b | 2000-08-04 03:05:40 +0000 | [diff] [blame] | 91 | |
Guido van Rossum | 3f56166 | 2001-07-05 13:27:48 +0000 | [diff] [blame^] | 92 | return PyString_FromString(buf1); |
Fred Drake | 5678025 | 2000-06-15 14:50:20 +0000 | [diff] [blame] | 93 | } |
| 94 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 95 | static PySequenceMethods range_as_sequence = { |
Fred Drake | 0b796fa | 2000-11-08 19:42:43 +0000 | [diff] [blame] | 96 | (inquiry)range_length, /*sq_length*/ |
Guido van Rossum | 3f56166 | 2001-07-05 13:27:48 +0000 | [diff] [blame^] | 97 | 0, /*sq_concat*/ |
| 98 | 0, /*sq_repeat*/ |
| 99 | (intargfunc)range_item, /*sq_item*/ |
| 100 | 0, /*sq_slice*/ |
Fred Drake | 0b796fa | 2000-11-08 19:42:43 +0000 | [diff] [blame] | 101 | 0, /*sq_ass_item*/ |
| 102 | 0, /*sq_ass_slice*/ |
Guido van Rossum | 3f56166 | 2001-07-05 13:27:48 +0000 | [diff] [blame^] | 103 | 0, /*sq_contains*/ |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 104 | }; |
| 105 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 106 | PyTypeObject PyRange_Type = { |
| 107 | PyObject_HEAD_INIT(&PyType_Type) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 108 | 0, /* Number of items for varobject */ |
Guido van Rossum | 2586bf0 | 1993-11-01 16:21:44 +0000 | [diff] [blame] | 109 | "xrange", /* Name of this type */ |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 110 | sizeof(rangeobject), /* Basic object size */ |
| 111 | 0, /* Item size for varobject */ |
Guido van Rossum | 03093a2 | 1994-09-28 15:51:32 +0000 | [diff] [blame] | 112 | (destructor)range_dealloc, /*tp_dealloc*/ |
Fred Drake | 2b83b46 | 2000-08-03 17:43:02 +0000 | [diff] [blame] | 113 | 0, /*tp_print*/ |
Guido van Rossum | 3f56166 | 2001-07-05 13:27:48 +0000 | [diff] [blame^] | 114 | 0, /*tp_getattr*/ |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 115 | 0, /*tp_setattr*/ |
Guido van Rossum | 3f56166 | 2001-07-05 13:27:48 +0000 | [diff] [blame^] | 116 | 0, /*tp_compare*/ |
Fred Drake | 2b83b46 | 2000-08-03 17:43:02 +0000 | [diff] [blame] | 117 | (reprfunc)range_repr, /*tp_repr*/ |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 118 | 0, /*tp_as_number*/ |
| 119 | &range_as_sequence, /*tp_as_sequence*/ |
| 120 | 0, /*tp_as_mapping*/ |
Fred Drake | 5678025 | 2000-06-15 14:50:20 +0000 | [diff] [blame] | 121 | 0, /*tp_hash*/ |
| 122 | 0, /*tp_call*/ |
| 123 | 0, /*tp_str*/ |
| 124 | 0, /*tp_getattro*/ |
| 125 | 0, /*tp_setattro*/ |
| 126 | 0, /*tp_as_buffer*/ |
| 127 | Py_TPFLAGS_DEFAULT, /*tp_flags*/ |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 128 | }; |