Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 1 | /* Iterator objects */ |
| 2 | |
| 3 | #include "Python.h" |
| 4 | |
| 5 | typedef struct { |
| 6 | PyObject_HEAD |
| 7 | long it_index; |
| 8 | PyObject *it_seq; |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 9 | } seqiterobject; |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 10 | |
| 11 | PyObject * |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 12 | PySeqIter_New(PyObject *seq) |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 13 | { |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 14 | seqiterobject *it; |
| 15 | it = PyObject_NEW(seqiterobject, &PySeqIter_Type); |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 16 | if (it == NULL) |
| 17 | return NULL; |
| 18 | it->it_index = 0; |
| 19 | Py_INCREF(seq); |
| 20 | it->it_seq = seq; |
| 21 | return (PyObject *)it; |
| 22 | } |
| 23 | static void |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 24 | iter_dealloc(seqiterobject *it) |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 25 | { |
| 26 | Py_DECREF(it->it_seq); |
| 27 | PyObject_DEL(it); |
| 28 | } |
| 29 | |
| 30 | static PyObject * |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 31 | iter_next(seqiterobject *it, PyObject *args) |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 32 | { |
| 33 | PyObject *seq = it->it_seq; |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 34 | PyObject *result = PySequence_GetItem(seq, it->it_index++); |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 35 | |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 36 | if (result == NULL && PyErr_ExceptionMatches(PyExc_IndexError)) |
| 37 | PyErr_SetObject(PyExc_StopIteration, Py_None); |
| 38 | return result; |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 39 | } |
| 40 | |
| 41 | static PyObject * |
| 42 | iter_getiter(PyObject *it) |
| 43 | { |
| 44 | Py_INCREF(it); |
| 45 | return it; |
| 46 | } |
| 47 | |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 48 | static PyObject * |
| 49 | iter_iternext(PyObject *iterator) |
| 50 | { |
| 51 | seqiterobject *it; |
| 52 | PyObject *seq; |
| 53 | |
| 54 | assert(PySeqIter_Check(iterator)); |
| 55 | it = (seqiterobject *)iterator; |
| 56 | seq = it->it_seq; |
| 57 | |
| 58 | if (PyList_Check(seq)) { |
| 59 | PyObject *item; |
| 60 | if (it->it_index >= PyList_GET_SIZE(seq)) { |
| 61 | return NULL; |
| 62 | } |
| 63 | item = PyList_GET_ITEM(seq, it->it_index); |
| 64 | it->it_index++; |
| 65 | Py_INCREF(item); |
| 66 | return item; |
| 67 | } |
| 68 | else { |
| 69 | PyObject *result = PySequence_GetItem(seq, it->it_index++); |
| 70 | if (result != NULL) { |
| 71 | return result; |
| 72 | } |
| 73 | if (PyErr_ExceptionMatches(PyExc_IndexError) || |
| 74 | PyErr_ExceptionMatches(PyExc_StopIteration)) { |
| 75 | PyErr_Clear(); |
| 76 | return NULL; |
| 77 | } |
| 78 | else { |
| 79 | return NULL; |
| 80 | } |
| 81 | } |
| 82 | } |
| 83 | |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 84 | static PyMethodDef iter_methods[] = { |
| 85 | {"next", (PyCFunction)iter_next, METH_VARARGS, |
| 86 | "it.next() -- get the next value, or raise StopIteration"}, |
| 87 | {NULL, NULL} /* sentinel */ |
| 88 | }; |
| 89 | |
| 90 | static PyObject * |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 91 | iter_getattr(seqiterobject *it, char *name) |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 92 | { |
| 93 | return Py_FindMethod(iter_methods, (PyObject *)it, name); |
| 94 | } |
| 95 | |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 96 | PyTypeObject PySeqIter_Type = { |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 97 | PyObject_HEAD_INIT(&PyType_Type) |
| 98 | 0, /* ob_size */ |
| 99 | "iterator", /* tp_name */ |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 100 | sizeof(seqiterobject), /* tp_basicsize */ |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 101 | 0, /* tp_itemsize */ |
| 102 | /* methods */ |
| 103 | (destructor)iter_dealloc, /* tp_dealloc */ |
| 104 | 0, /* tp_print */ |
| 105 | (getattrfunc)iter_getattr, /* tp_getattr */ |
| 106 | 0, /* tp_setattr */ |
| 107 | 0, /* tp_compare */ |
| 108 | 0, /* tp_repr */ |
| 109 | 0, /* tp_as_number */ |
| 110 | 0, /* tp_as_sequence */ |
| 111 | 0, /* tp_as_mapping */ |
| 112 | 0, /* tp_hash */ |
| 113 | 0, /* tp_call */ |
| 114 | 0, /* tp_str */ |
| 115 | 0, /* tp_getattro */ |
| 116 | 0, /* tp_setattro */ |
| 117 | 0, /* tp_as_buffer */ |
| 118 | Py_TPFLAGS_DEFAULT, /* tp_flags */ |
| 119 | 0, /* tp_doc */ |
| 120 | 0, /* tp_traverse */ |
| 121 | 0, /* tp_clear */ |
| 122 | 0, /* tp_richcompare */ |
| 123 | 0, /* tp_weaklistoffset */ |
| 124 | (getiterfunc)iter_getiter, /* tp_iter */ |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 125 | (iternextfunc)iter_iternext, /* tp_iternext */ |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 126 | }; |
| 127 | |
| 128 | /* -------------------------------------- */ |
| 129 | |
| 130 | typedef struct { |
| 131 | PyObject_HEAD |
| 132 | PyObject *it_callable; |
| 133 | PyObject *it_sentinel; |
| 134 | } calliterobject; |
| 135 | |
| 136 | PyObject * |
| 137 | PyCallIter_New(PyObject *callable, PyObject *sentinel) |
| 138 | { |
| 139 | calliterobject *it; |
| 140 | it = PyObject_NEW(calliterobject, &PyCallIter_Type); |
| 141 | if (it == NULL) |
| 142 | return NULL; |
| 143 | Py_INCREF(callable); |
| 144 | it->it_callable = callable; |
| 145 | Py_INCREF(sentinel); |
| 146 | it->it_sentinel = sentinel; |
| 147 | return (PyObject *)it; |
| 148 | } |
| 149 | static void |
| 150 | calliter_dealloc(calliterobject *it) |
| 151 | { |
| 152 | Py_DECREF(it->it_callable); |
| 153 | Py_DECREF(it->it_sentinel); |
| 154 | PyObject_DEL(it); |
| 155 | } |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 156 | |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 157 | static PyObject * |
| 158 | calliter_next(calliterobject *it, PyObject *args) |
| 159 | { |
| 160 | PyObject *result = PyObject_CallObject(it->it_callable, NULL); |
| 161 | if (result != NULL) { |
| 162 | if (PyObject_RichCompareBool(result, it->it_sentinel, Py_EQ)) { |
| 163 | PyErr_SetObject(PyExc_StopIteration, Py_None); |
| 164 | Py_DECREF(result); |
| 165 | result = NULL; |
| 166 | } |
| 167 | } |
| 168 | return result; |
| 169 | } |
| 170 | |
| 171 | static PyMethodDef calliter_methods[] = { |
| 172 | {"next", (PyCFunction)calliter_next, METH_VARARGS, |
| 173 | "it.next() -- get the next value, or raise StopIteration"}, |
| 174 | {NULL, NULL} /* sentinel */ |
| 175 | }; |
| 176 | |
| 177 | static PyObject * |
| 178 | calliter_getattr(calliterobject *it, char *name) |
| 179 | { |
| 180 | return Py_FindMethod(calliter_methods, (PyObject *)it, name); |
| 181 | } |
| 182 | |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 183 | static PyObject * |
| 184 | calliter_iternext(calliterobject *it) |
| 185 | { |
| 186 | PyObject *result = PyObject_CallObject(it->it_callable, NULL); |
| 187 | if (result != NULL) { |
| 188 | if (PyObject_RichCompareBool(result, it->it_sentinel, Py_EQ)) { |
| 189 | Py_DECREF(result); |
| 190 | result = NULL; |
| 191 | } |
| 192 | } |
| 193 | else if (PyErr_ExceptionMatches(PyExc_StopIteration)) { |
| 194 | PyErr_Clear(); |
| 195 | } |
| 196 | return result; |
| 197 | } |
| 198 | |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 199 | PyTypeObject PyCallIter_Type = { |
| 200 | PyObject_HEAD_INIT(&PyType_Type) |
| 201 | 0, /* ob_size */ |
| 202 | "callable-iterator", /* tp_name */ |
| 203 | sizeof(calliterobject), /* tp_basicsize */ |
| 204 | 0, /* tp_itemsize */ |
| 205 | /* methods */ |
| 206 | (destructor)calliter_dealloc, /* tp_dealloc */ |
| 207 | 0, /* tp_print */ |
| 208 | (getattrfunc)calliter_getattr, /* tp_getattr */ |
| 209 | 0, /* tp_setattr */ |
| 210 | 0, /* tp_compare */ |
| 211 | 0, /* tp_repr */ |
| 212 | 0, /* tp_as_number */ |
| 213 | 0, /* tp_as_sequence */ |
| 214 | 0, /* tp_as_mapping */ |
| 215 | 0, /* tp_hash */ |
| 216 | 0, /* tp_call */ |
| 217 | 0, /* tp_str */ |
| 218 | 0, /* tp_getattro */ |
| 219 | 0, /* tp_setattro */ |
| 220 | 0, /* tp_as_buffer */ |
| 221 | Py_TPFLAGS_DEFAULT, /* tp_flags */ |
| 222 | 0, /* tp_doc */ |
| 223 | 0, /* tp_traverse */ |
| 224 | 0, /* tp_clear */ |
| 225 | 0, /* tp_richcompare */ |
| 226 | 0, /* tp_weaklistoffset */ |
| 227 | (getiterfunc)iter_getiter, /* tp_iter */ |
Guido van Rossum | 213c7a6 | 2001-04-23 14:08:49 +0000 | [diff] [blame] | 228 | (iternextfunc)calliter_iternext, /* tp_iternext */ |
Guido van Rossum | 0531148 | 2001-04-20 21:06:46 +0000 | [diff] [blame] | 229 | }; |