Mercurial > cpython-lru_cache-weakref

annotate Modules/_bisectmodule.c @ 78315:efade142ef01 3.2

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Issue #15467: Move helpers for __sizeof__ tests into test_support. Patch by Serhiy Storchaka.
author Martin v. Löwis <martin@v.loewis.de>
date Sun, 29 Jul 2012 16:33:05 +0200
parents 888f5f3bfcb6
children a3784c8f165e
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1 /* Bisection algorithms. Drop in replacement for bisect.py
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2
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3 Converted to C by Dmitry Vasiliev (dima at hlabs.spb.ru).
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4 */
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5
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6 #define PY_SSIZE_T_CLEAN
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7 #include "Python.h"
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8
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9 static Py_ssize_t
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10 internal_bisect_right(PyObject *list, PyObject *item, Py_ssize_t lo, Py_ssize_t hi)
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11 {
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12 PyObject *litem;
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13 Py_ssize_t mid, res;
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14
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15 if (lo < 0) {
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16 PyErr_SetString(PyExc_ValueError, "lo must be non-negative");
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17 return -1;
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18 }
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19 if (hi == -1) {
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20 hi = PySequence_Size(list);
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21 if (hi < 0)
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22 return -1;
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23 }
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24 while (lo < hi) {
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25 /* The (size_t)cast ensures that the addition and subsequent division
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26 are performed as unsigned operations, avoiding difficulties from
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27 signed overflow. (See issue 13496.) */
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28 mid = ((size_t)lo + hi) / 2;
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29 litem = PySequence_GetItem(list, mid);
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30 if (litem == NULL)
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31 return -1;
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32 res = PyObject_RichCompareBool(item, litem, Py_LT);
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33 Py_DECREF(litem);
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34 if (res < 0)
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35 return -1;
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36 if (res)
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37 hi = mid;
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38 else
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39 lo = mid + 1;
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40 }
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41 return lo;
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42 }
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43
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44 static PyObject *
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45 bisect_right(PyObject *self, PyObject *args, PyObject *kw)
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46 {
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47 PyObject *list, *item;
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48 Py_ssize_t lo = 0;
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49 Py_ssize_t hi = -1;
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50 Py_ssize_t index;
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51 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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52
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53 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:bisect_right",
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54 keywords, &list, &item, &lo, &hi))
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55 return NULL;
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56 index = internal_bisect_right(list, item, lo, hi);
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57 if (index < 0)
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58 return NULL;
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59 return PyLong_FromSsize_t(index);
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60 }
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61
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62 PyDoc_STRVAR(bisect_right_doc,
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63 "bisect_right(a, x[, lo[, hi]]) -> index\n\
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64 \n\
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65 Return the index where to insert item x in list a, assuming a is sorted.\n\
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66 \n\
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67 The return value i is such that all e in a[:i] have e <= x, and all e in\n\
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68 a[i:] have e > x. So if x already appears in the list, i points just\n\
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69 beyond the rightmost x already there\n\
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70 \n\
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71 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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72 slice of a to be searched.\n");
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73
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74 static PyObject *
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75 insort_right(PyObject *self, PyObject *args, PyObject *kw)
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76 {
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77 PyObject *list, *item, *result;
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78 Py_ssize_t lo = 0;
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79 Py_ssize_t hi = -1;
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80 Py_ssize_t index;
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81 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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82
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83 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:insort_right",
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84 keywords, &list, &item, &lo, &hi))
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85 return NULL;
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86 index = internal_bisect_right(list, item, lo, hi);
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87 if (index < 0)
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88 return NULL;
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89 if (PyList_CheckExact(list)) {
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90 if (PyList_Insert(list, index, item) < 0)
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91 return NULL;
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92 } else {
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93 result = PyObject_CallMethod(list, "insert", "nO", index, item);
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94 if (result == NULL)
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95 return NULL;
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96 Py_DECREF(result);
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97 }
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98
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99 Py_RETURN_NONE;
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100 }
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101
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102 PyDoc_STRVAR(insort_right_doc,
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103 "insort_right(a, x[, lo[, hi]])\n\
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104 \n\
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105 Insert item x in list a, and keep it sorted assuming a is sorted.\n\
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106 \n\
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107 If x is already in a, insert it to the right of the rightmost x.\n\
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108 \n\
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109 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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110 slice of a to be searched.\n");
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111
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112 static Py_ssize_t
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113 internal_bisect_left(PyObject *list, PyObject *item, Py_ssize_t lo, Py_ssize_t hi)
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114 {
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115 PyObject *litem;
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116 Py_ssize_t mid, res;
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117
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118 if (lo < 0) {
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119 PyErr_SetString(PyExc_ValueError, "lo must be non-negative");
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120 return -1;
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121 }
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122 if (hi == -1) {
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123 hi = PySequence_Size(list);
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124 if (hi < 0)
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125 return -1;
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126 }
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127 while (lo < hi) {
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128 /* The (size_t)cast ensures that the addition and subsequent division
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129 are performed as unsigned operations, avoiding difficulties from
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130 signed overflow. (See issue 13496.) */
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131 mid = ((size_t)lo + hi) / 2;
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132 litem = PySequence_GetItem(list, mid);
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133 if (litem == NULL)
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134 return -1;
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135 res = PyObject_RichCompareBool(litem, item, Py_LT);
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136 Py_DECREF(litem);
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137 if (res < 0)
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138 return -1;
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139 if (res)
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140 lo = mid + 1;
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141 else
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142 hi = mid;
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143 }
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144 return lo;
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145 }
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146
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147 static PyObject *
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148 bisect_left(PyObject *self, PyObject *args, PyObject *kw)
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149 {
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150 PyObject *list, *item;
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151 Py_ssize_t lo = 0;
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152 Py_ssize_t hi = -1;
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153 Py_ssize_t index;
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154 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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155
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156 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:bisect_left",
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157 keywords, &list, &item, &lo, &hi))
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158 return NULL;
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159 index = internal_bisect_left(list, item, lo, hi);
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160 if (index < 0)
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161 return NULL;
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162 return PyLong_FromSsize_t(index);
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163 }
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164
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165 PyDoc_STRVAR(bisect_left_doc,
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166 "bisect_left(a, x[, lo[, hi]]) -> index\n\
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167 \n\
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168 Return the index where to insert item x in list a, assuming a is sorted.\n\
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169 \n\
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170 The return value i is such that all e in a[:i] have e < x, and all e in\n\
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171 a[i:] have e >= x. So if x already appears in the list, i points just\n\
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172 before the leftmost x already there.\n\
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173 \n\
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174 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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175 slice of a to be searched.\n");
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176
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177 static PyObject *
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178 insort_left(PyObject *self, PyObject *args, PyObject *kw)
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179 {
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180 PyObject *list, *item, *result;
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181 Py_ssize_t lo = 0;
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182 Py_ssize_t hi = -1;
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183 Py_ssize_t index;
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184 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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185
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186 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:insort_left",
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187 keywords, &list, &item, &lo, &hi))
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188 return NULL;
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189 index = internal_bisect_left(list, item, lo, hi);
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190 if (index < 0)
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191 return NULL;
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192 if (PyList_CheckExact(list)) {
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193 if (PyList_Insert(list, index, item) < 0)
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194 return NULL;
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195 } else {
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196 result = PyObject_CallMethod(list, "insert", "nO", index, item);
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197 if (result == NULL)
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198 return NULL;
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199 Py_DECREF(result);
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200 }
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201
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202 Py_RETURN_NONE;
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203 }
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204
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205 PyDoc_STRVAR(insort_left_doc,
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206 "insort_left(a, x[, lo[, hi]])\n\
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207 \n\
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208 Insert item x in list a, and keep it sorted assuming a is sorted.\n\
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209 \n\
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210 If x is already in a, insert it to the left of the leftmost x.\n\
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211 \n\
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212 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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213 slice of a to be searched.\n");
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214
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215 PyDoc_STRVAR(bisect_doc, "Alias for bisect_right().\n");
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216 PyDoc_STRVAR(insort_doc, "Alias for insort_right().\n");
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217
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218 static PyMethodDef bisect_methods[] = {
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219 {"bisect_right", (PyCFunction)bisect_right,
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220 METH_VARARGS|METH_KEYWORDS, bisect_right_doc},
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221 {"bisect", (PyCFunction)bisect_right,
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222 METH_VARARGS|METH_KEYWORDS, bisect_doc},
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223 {"insort_right", (PyCFunction)insort_right,
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224 METH_VARARGS|METH_KEYWORDS, insort_right_doc},
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225 {"insort", (PyCFunction)insort_right,
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226 METH_VARARGS|METH_KEYWORDS, insort_doc},
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227 {"bisect_left", (PyCFunction)bisect_left,
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228 METH_VARARGS|METH_KEYWORDS, bisect_left_doc},
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229 {"insort_left", (PyCFunction)insort_left,
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230 METH_VARARGS|METH_KEYWORDS, insort_left_doc},
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231 {NULL, NULL} /* sentinel */
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232 };
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233
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234 PyDoc_STRVAR(module_doc,
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235 "Bisection algorithms.\n\
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236 \n\
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237 This module provides support for maintaining a list in sorted order without\n\
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238 having to sort the list after each insertion. For long lists of items with\n\
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239 expensive comparison operations, this can be an improvement over the more\n\
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240 common approach.\n");
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241
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242
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243 static struct PyModuleDef _bisectmodule = {
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244 PyModuleDef_HEAD_INIT,
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245 "_bisect",
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246 module_doc,
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247 -1,
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248 bisect_methods,
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249 NULL,
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250 NULL,
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251 NULL,
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252 NULL
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253 };
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254
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255 PyMODINIT_FUNC
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256 PyInit__bisect(void)
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257 {
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258 return PyModule_Create(&_bisectmodule);
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259 }