Mercurial > cpython-lru_cache-weakref

annotate Modules/xreadlinesmodule.c @ 32527:0da660e05e69 legacy-trunk

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"#if WITH_THREAD" is incorrect; must be #ifdef instead; WITH_THREAD isn't always set to an integer value when it's defined.
author Tim Peters <tim.peters@gmail.com>
date Wed, 07 Jul 2004 20:42:07 +0000
parents fd5ef7003469
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "Python.h"
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2
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3 PyDoc_STRVAR(xreadlines_doc,
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4 "xreadlines(f)\n\
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5 \n\
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6 Return an xreadlines object for the file f.");
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7
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8 typedef struct {
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9 PyObject_HEAD
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10 PyObject *file;
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11 PyObject *lines;
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12 int lineslen;
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13 int lineno;
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14 int abslineno;
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15 } PyXReadlinesObject;
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16
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17 static PyTypeObject XReadlinesObject_Type;
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18
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19 static void
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20 xreadlines_dealloc(PyXReadlinesObject *op)
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21 {
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22 Py_XDECREF(op->file);
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23 Py_XDECREF(op->lines);
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24 PyObject_DEL(op);
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25 }
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26
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27 /* A larger chunk size doesn't seem to make a difference */
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28 #define CHUNKSIZE 8192
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29
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30 static PyXReadlinesObject *
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31 newreadlinesobject(PyObject *file)
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32 {
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33 PyXReadlinesObject *op;
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34 op = PyObject_NEW(PyXReadlinesObject, &XReadlinesObject_Type);
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35 if (op == NULL)
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36 return NULL;
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37 Py_XINCREF(file);
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38 op->file = file;
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39 op->lines = NULL;
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40 op->abslineno = op->lineno = op->lineslen = 0;
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41 return op;
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42 }
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43
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44 static PyObject *
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45 xreadlines(PyObject *self, PyObject *args)
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46 {
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47 PyObject *file;
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48 PyXReadlinesObject *ret;
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49
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50 if (!PyArg_ParseTuple(args, "O:xreadlines", &file))
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51 return NULL;
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52 ret = newreadlinesobject(file);
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53 return (PyObject*)ret;
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54 }
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55
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56 static PyObject *
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57 xreadlines_common(PyXReadlinesObject *a)
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58 {
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59 if (a->lineno >= a->lineslen) {
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60 Py_XDECREF(a->lines);
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61 a->lines = PyObject_CallMethod(a->file, "readlines", "(i)",
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62 CHUNKSIZE);
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63 if (a->lines == NULL)
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64 return NULL;
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65 a->lineno = 0;
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66 if ((a->lineslen = PySequence_Size(a->lines)) < 0)
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67 return NULL;
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68 }
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69 a->abslineno++;
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70 return PySequence_GetItem(a->lines, a->lineno++);
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71 }
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72
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73 static PyObject *
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74 xreadlines_item(PyXReadlinesObject *a, int i)
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75 {
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76 if (i != a->abslineno) {
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77 PyErr_SetString(PyExc_RuntimeError,
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78 "xreadlines object accessed out of order");
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79 return NULL;
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80 }
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81 return xreadlines_common(a);
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82 }
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83
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84 static PyObject *
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85 xreadlines_iternext(PyXReadlinesObject *a)
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86 {
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87 PyObject *res;
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88
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89 res = xreadlines_common(a);
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90 if (res == NULL && PyErr_ExceptionMatches(PyExc_IndexError))
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91 PyErr_Clear();
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92 return res;
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93 }
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94
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95 static PyObject *
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96 xreadlines_next(PyXReadlinesObject *a, PyObject *args)
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97 {
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98 PyObject *res;
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99
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100 if (!PyArg_ParseTuple(args, ""))
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101 return NULL;
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102 res = xreadlines_common(a);
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103 if (res == NULL && PyErr_ExceptionMatches(PyExc_IndexError))
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104 PyErr_SetObject(PyExc_StopIteration, Py_None);
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105 return res;
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106 }
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107
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108 PyDoc_STRVAR(next_doc, "x.next() -> the next line or raise StopIteration");
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109
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110 static PyMethodDef xreadlines_methods[] = {
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111 {"next", (PyCFunction)xreadlines_next, METH_VARARGS, next_doc},
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112 {NULL, NULL}
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113 };
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114
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115 static PyObject *
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116 xreadlines_getattr(PyObject *a, char *name)
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117 {
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118 return Py_FindMethod(xreadlines_methods, a, name);
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119 }
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120
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121 static PySequenceMethods xreadlines_as_sequence = {
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122 0, /*sq_length*/
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123 0, /*sq_concat*/
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124 0, /*sq_repeat*/
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125 (intargfunc)xreadlines_item, /*sq_item*/
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126 };
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127
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128 static PyTypeObject XReadlinesObject_Type = {
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129 PyObject_HEAD_INIT(NULL)
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130 0,
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131 "xreadlines.xreadlines",
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132 sizeof(PyXReadlinesObject),
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133 0,
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134 (destructor)xreadlines_dealloc, /* tp_dealloc */
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135 0, /* tp_print */
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136 xreadlines_getattr, /* tp_getattr */
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137 0, /* tp_setattr */
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138 0, /* tp_compare */
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139 0, /* tp_repr */
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140 0, /* tp_as_number */
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141 &xreadlines_as_sequence, /* tp_as_sequence */
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142 0, /* tp_as_mapping */
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143 0, /* tp_hash */
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144 0, /* tp_call */
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145 0, /* tp_str */
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146 0, /* tp_getattro */
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147 0, /* tp_setattro */
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148 0, /* tp_as_buffer */
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149 Py_TPFLAGS_DEFAULT, /* tp_flags */
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150 0, /* tp_doc */
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151 0, /* tp_traverse */
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152 0, /* tp_clear */
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153 0, /* tp_richcompare */
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154 0, /* tp_weaklistoffset */
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155 PyObject_SelfIter, /* tp_iter */
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156 (iternextfunc)xreadlines_iternext, /* tp_iternext */
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157 };
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158
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159 static PyMethodDef xreadlines_functions[] = {
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160 {"xreadlines", xreadlines, METH_VARARGS, xreadlines_doc},
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161 {NULL, NULL}
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162 };
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163
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164 PyMODINIT_FUNC
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165 initxreadlines(void)
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166 {
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167 XReadlinesObject_Type.ob_type = &PyType_Type;
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168 Py_InitModule("xreadlines", xreadlines_functions);
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169 PyErr_Warn(PyExc_DeprecationWarning,
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170 "xreadlines is deprecated; use 'for line in file'.");
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171 }