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
|
#include "Python.h"
PyDoc_STRVAR(xreadlines_doc,
"xreadlines(f)\n\
\n\
Return an xreadlines object for the file f.");
typedef struct {
PyObject_HEAD
PyObject *file;
PyObject *lines;
int lineslen;
int lineno;
int abslineno;
} PyXReadlinesObject;
staticforward PyTypeObject XReadlinesObject_Type;
static void
xreadlines_dealloc(PyXReadlinesObject *op)
{
Py_XDECREF(op->file);
Py_XDECREF(op->lines);
PyObject_DEL(op);
}
/* A larger chunk size doesn't seem to make a difference */
#define CHUNKSIZE 8192
static PyXReadlinesObject *
newreadlinesobject(PyObject *file)
{
PyXReadlinesObject *op;
op = PyObject_NEW(PyXReadlinesObject, &XReadlinesObject_Type);
if (op == NULL)
return NULL;
Py_XINCREF(file);
op->file = file;
op->lines = NULL;
op->abslineno = op->lineno = op->lineslen = 0;
return op;
}
static PyObject *
xreadlines(PyObject *self, PyObject *args)
{
PyObject *file;
PyXReadlinesObject *ret;
if (!PyArg_ParseTuple(args, "O:xreadlines", &file))
return NULL;
ret = newreadlinesobject(file);
return (PyObject*)ret;
}
static PyObject *
xreadlines_common(PyXReadlinesObject *a)
{
if (a->lineno >= a->lineslen) {
Py_XDECREF(a->lines);
a->lines = PyObject_CallMethod(a->file, "readlines", "(i)",
CHUNKSIZE);
if (a->lines == NULL)
return NULL;
a->lineno = 0;
if ((a->lineslen = PySequence_Size(a->lines)) < 0)
return NULL;
}
a->abslineno++;
return PySequence_GetItem(a->lines, a->lineno++);
}
static PyObject *
xreadlines_item(PyXReadlinesObject *a, int i)
{
if (i != a->abslineno) {
PyErr_SetString(PyExc_RuntimeError,
"xreadlines object accessed out of order");
return NULL;
}
return xreadlines_common(a);
}
static PyObject *
xreadlines_getiter(PyXReadlinesObject *a)
{
Py_INCREF(a);
return (PyObject *)a;
}
static PyObject *
xreadlines_iternext(PyXReadlinesObject *a)
{
PyObject *res;
res = xreadlines_common(a);
if (res == NULL && PyErr_ExceptionMatches(PyExc_IndexError))
PyErr_Clear();
return res;
}
static PyObject *
xreadlines_next(PyXReadlinesObject *a, PyObject *args)
{
PyObject *res;
if (!PyArg_ParseTuple(args, ""))
return NULL;
res = xreadlines_common(a);
if (res == NULL && PyErr_ExceptionMatches(PyExc_IndexError))
PyErr_SetObject(PyExc_StopIteration, Py_None);
return res;
}
PyDoc_STRVAR(next_doc, "x.next() -> the next line or raise StopIteration");
static PyMethodDef xreadlines_methods[] = {
{"next", (PyCFunction)xreadlines_next, METH_VARARGS, next_doc},
{NULL, NULL}
};
static PyObject *
xreadlines_getattr(PyObject *a, char *name)
{
return Py_FindMethod(xreadlines_methods, a, name);
}
static PySequenceMethods xreadlines_as_sequence = {
0, /*sq_length*/
0, /*sq_concat*/
0, /*sq_repeat*/
(intargfunc)xreadlines_item, /*sq_item*/
};
static PyTypeObject XReadlinesObject_Type = {
PyObject_HEAD_INIT(NULL)
0,
"xreadlines.xreadlines",
sizeof(PyXReadlinesObject),
0,
(destructor)xreadlines_dealloc, /* tp_dealloc */
0, /* tp_print */
xreadlines_getattr, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
&xreadlines_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 */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
(getiterfunc)xreadlines_getiter, /* tp_iter */
(iternextfunc)xreadlines_iternext, /* tp_iternext */
};
static PyMethodDef xreadlines_functions[] = {
{"xreadlines", xreadlines, METH_VARARGS, xreadlines_doc},
{NULL, NULL}
};
DL_EXPORT(void)
initxreadlines(void)
{
XReadlinesObject_Type.ob_type = &PyType_Type;
Py_InitModule("xreadlines", xreadlines_functions);
}
|
