Mercurial > cpython-lru_cache-weakref

annotate Modules/_bisectmodule.c @ 74006:88198b93ff2f

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Issue #13560: Add PyUnicode_EncodeLocale() * Use PyUnicode_EncodeLocale() in time.strftime() if wcsftime() is not available * Document my last changes in Misc/NEWS
author Victor Stinner <victor.stinner@haypocalc.com>
date Sat, 17 Dec 2011 04:13:41 +0100
parents 7109f31300fb
children 1a9252280f07
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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 #include "Python.h"
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7
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8 static Py_ssize_t
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9 internal_bisect_right(PyObject *list, PyObject *item, Py_ssize_t lo, Py_ssize_t hi)
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10 {
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11 PyObject *litem;
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12 Py_ssize_t mid, res;
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13
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14 if (lo < 0) {
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15 PyErr_SetString(PyExc_ValueError, "lo must be non-negative");
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16 return -1;
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17 }
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18 if (hi == -1) {
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19 hi = PySequence_Size(list);
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20 if (hi < 0)
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21 return -1;
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22 }
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23 while (lo < hi) {
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24 mid = (lo + hi) / 2;
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25 litem = PySequence_GetItem(list, mid);
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26 if (litem == NULL)
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27 return -1;
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28 res = PyObject_RichCompareBool(item, litem, Py_LT);
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29 Py_DECREF(litem);
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30 if (res < 0)
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31 return -1;
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32 if (res)
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33 hi = mid;
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34 else
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35 lo = mid + 1;
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36 }
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37 return lo;
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38 }
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39
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40 static PyObject *
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41 bisect_right(PyObject *self, PyObject *args, PyObject *kw)
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42 {
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43 PyObject *list, *item;
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44 Py_ssize_t lo = 0;
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45 Py_ssize_t hi = -1;
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46 Py_ssize_t index;
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47 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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48
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49 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:bisect_right",
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50 keywords, &list, &item, &lo, &hi))
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51 return NULL;
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52 index = internal_bisect_right(list, item, lo, hi);
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53 if (index < 0)
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54 return NULL;
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55 return PyLong_FromSsize_t(index);
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56 }
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57
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58 PyDoc_STRVAR(bisect_right_doc,
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59 "bisect_right(a, x[, lo[, hi]]) -> index\n\
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60 \n\
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61 Return the index where to insert item x in list a, assuming a is sorted.\n\
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62 \n\
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63 The return value i is such that all e in a[:i] have e <= x, and all e in\n\
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64 a[i:] have e > x. So if x already appears in the list, i points just\n\
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65 beyond the rightmost x already there\n\
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66 \n\
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67 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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68 slice of a to be searched.\n");
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69
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70 static PyObject *
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71 insort_right(PyObject *self, PyObject *args, PyObject *kw)
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72 {
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73 PyObject *list, *item, *result;
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74 Py_ssize_t lo = 0;
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75 Py_ssize_t hi = -1;
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76 Py_ssize_t index;
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77 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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78
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79 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:insort_right",
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80 keywords, &list, &item, &lo, &hi))
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81 return NULL;
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82 index = internal_bisect_right(list, item, lo, hi);
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83 if (index < 0)
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84 return NULL;
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85 if (PyList_CheckExact(list)) {
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86 if (PyList_Insert(list, index, item) < 0)
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87 return NULL;
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88 } else {
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89 _Py_IDENTIFIER(insert);
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90
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91 result = _PyObject_CallMethodId(list, &PyId_insert, "nO", index, item);
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92 if (result == NULL)
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93 return NULL;
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94 Py_DECREF(result);
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95 }
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96
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97 Py_RETURN_NONE;
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98 }
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99
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100 PyDoc_STRVAR(insort_right_doc,
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101 "insort_right(a, x[, lo[, hi]])\n\
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102 \n\
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103 Insert item x in list a, and keep it sorted assuming a is sorted.\n\
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104 \n\
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105 If x is already in a, insert it to the right of the rightmost x.\n\
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106 \n\
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107 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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108 slice of a to be searched.\n");
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109
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110 static Py_ssize_t
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111 internal_bisect_left(PyObject *list, PyObject *item, Py_ssize_t lo, Py_ssize_t hi)
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112 {
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113 PyObject *litem;
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114 Py_ssize_t mid, res;
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115
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116 if (lo < 0) {
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117 PyErr_SetString(PyExc_ValueError, "lo must be non-negative");
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118 return -1;
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119 }
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120 if (hi == -1) {
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121 hi = PySequence_Size(list);
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122 if (hi < 0)
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123 return -1;
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124 }
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125 while (lo < hi) {
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126 mid = (lo + hi) / 2;
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127 litem = PySequence_GetItem(list, mid);
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128 if (litem == NULL)
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129 return -1;
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130 res = PyObject_RichCompareBool(litem, item, Py_LT);
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131 Py_DECREF(litem);
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132 if (res < 0)
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133 return -1;
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134 if (res)
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135 lo = mid + 1;
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136 else
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137 hi = mid;
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138 }
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139 return lo;
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140 }
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141
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142 static PyObject *
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143 bisect_left(PyObject *self, PyObject *args, PyObject *kw)
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144 {
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145 PyObject *list, *item;
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146 Py_ssize_t lo = 0;
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147 Py_ssize_t hi = -1;
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148 Py_ssize_t index;
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149 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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150
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151 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:bisect_left",
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152 keywords, &list, &item, &lo, &hi))
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153 return NULL;
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154 index = internal_bisect_left(list, item, lo, hi);
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155 if (index < 0)
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156 return NULL;
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157 return PyLong_FromSsize_t(index);
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158 }
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159
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160 PyDoc_STRVAR(bisect_left_doc,
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161 "bisect_left(a, x[, lo[, hi]]) -> index\n\
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162 \n\
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163 Return the index where to insert item x in list a, assuming a is sorted.\n\
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164 \n\
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165 The return value i is such that all e in a[:i] have e < x, and all e in\n\
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166 a[i:] have e >= x. So if x already appears in the list, i points just\n\
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167 before the leftmost x already there.\n\
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168 \n\
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169 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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170 slice of a to be searched.\n");
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171
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172 static PyObject *
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173 insort_left(PyObject *self, PyObject *args, PyObject *kw)
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174 {
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175 PyObject *list, *item, *result;
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176 Py_ssize_t lo = 0;
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177 Py_ssize_t hi = -1;
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178 Py_ssize_t index;
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179 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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180
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181 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:insort_left",
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182 keywords, &list, &item, &lo, &hi))
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183 return NULL;
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184 index = internal_bisect_left(list, item, lo, hi);
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185 if (index < 0)
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186 return NULL;
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187 if (PyList_CheckExact(list)) {
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188 if (PyList_Insert(list, index, item) < 0)
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189 return NULL;
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190 } else {
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191 _Py_IDENTIFIER(insert);
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192
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193 result = _PyObject_CallMethodId(list, &PyId_insert, "iO", index, item);
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194 if (result == NULL)
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195 return NULL;
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196 Py_DECREF(result);
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197 }
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198
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199 Py_RETURN_NONE;
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200 }
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201
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202 PyDoc_STRVAR(insort_left_doc,
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203 "insort_left(a, x[, lo[, hi]])\n\
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204 \n\
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205 Insert item x in list a, and keep it sorted assuming a is sorted.\n\
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206 \n\
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207 If x is already in a, insert it to the left of the leftmost x.\n\
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208 \n\
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209 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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210 slice of a to be searched.\n");
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211
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212 PyDoc_STRVAR(bisect_doc, "Alias for bisect_right().\n");
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213 PyDoc_STRVAR(insort_doc, "Alias for insort_right().\n");
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214
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215 static PyMethodDef bisect_methods[] = {
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216 {"bisect_right", (PyCFunction)bisect_right,
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217 METH_VARARGS|METH_KEYWORDS, bisect_right_doc},
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218 {"bisect", (PyCFunction)bisect_right,
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219 METH_VARARGS|METH_KEYWORDS, bisect_doc},
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220 {"insort_right", (PyCFunction)insort_right,
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221 METH_VARARGS|METH_KEYWORDS, insort_right_doc},
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222 {"insort", (PyCFunction)insort_right,
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223 METH_VARARGS|METH_KEYWORDS, insort_doc},
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224 {"bisect_left", (PyCFunction)bisect_left,
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225 METH_VARARGS|METH_KEYWORDS, bisect_left_doc},
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226 {"insort_left", (PyCFunction)insort_left,
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227 METH_VARARGS|METH_KEYWORDS, insort_left_doc},
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228 {NULL, NULL} /* sentinel */
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229 };
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230
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231 PyDoc_STRVAR(module_doc,
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232 "Bisection algorithms.\n\
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233 \n\
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234 This module provides support for maintaining a list in sorted order without\n\
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235 having to sort the list after each insertion. For long lists of items with\n\
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236 expensive comparison operations, this can be an improvement over the more\n\
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237 common approach.\n");
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238
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239
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240 static struct PyModuleDef _bisectmodule = {
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241 PyModuleDef_HEAD_INIT,
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242 "_bisect",
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243 module_doc,
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244 -1,
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245 bisect_methods,
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246 NULL,
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247 NULL,
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248 NULL,
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249 NULL
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250 };
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251
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252 PyMODINIT_FUNC
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253 PyInit__bisect(void)
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254 {
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255 return PyModule_Create(&_bisectmodule);
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256 }