Mercurial > cpython-lru_cache-weakref

annotate Modules/_bisectmodule.c @ 76467:765ca3caee10

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author Brett Cannon <brett@python.org>
date Sun, 22 Apr 2012 02:06:48 -0400
parents 1a9252280f07
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 #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 /* The (size_t)cast ensures that the addition and subsequent division
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25 are performed as unsigned operations, avoiding difficulties from
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26 signed overflow. (See issue 13496.) */
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27 mid = ((size_t)lo + hi) / 2;
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28 litem = PySequence_GetItem(list, mid);
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29 if (litem == NULL)
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30 return -1;
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31 res = PyObject_RichCompareBool(item, litem, Py_LT);
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32 Py_DECREF(litem);
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33 if (res < 0)
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34 return -1;
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35 if (res)
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36 hi = mid;
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37 else
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38 lo = mid + 1;
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39 }
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40 return lo;
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41 }
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42
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43 static PyObject *
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44 bisect_right(PyObject *self, PyObject *args, PyObject *kw)
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45 {
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46 PyObject *list, *item;
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47 Py_ssize_t lo = 0;
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48 Py_ssize_t hi = -1;
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49 Py_ssize_t index;
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50 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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51
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52 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:bisect_right",
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53 keywords, &list, &item, &lo, &hi))
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54 return NULL;
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55 index = internal_bisect_right(list, item, lo, hi);
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56 if (index < 0)
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57 return NULL;
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58 return PyLong_FromSsize_t(index);
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59 }
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60
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61 PyDoc_STRVAR(bisect_right_doc,
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62 "bisect_right(a, x[, lo[, hi]]) -> index\n\
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63 \n\
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64 Return the index where to insert item x in list a, assuming a is sorted.\n\
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65 \n\
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66 The return value i is such that all e in a[:i] have e <= x, and all e in\n\
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67 a[i:] have e > x. So if x already appears in the list, i points just\n\
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68 beyond the rightmost x already there\n\
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69 \n\
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70 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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71 slice of a to be searched.\n");
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72
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73 static PyObject *
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74 insort_right(PyObject *self, PyObject *args, PyObject *kw)
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75 {
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76 PyObject *list, *item, *result;
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77 Py_ssize_t lo = 0;
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78 Py_ssize_t hi = -1;
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79 Py_ssize_t index;
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80 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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81
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82 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:insort_right",
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83 keywords, &list, &item, &lo, &hi))
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84 return NULL;
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85 index = internal_bisect_right(list, item, lo, hi);
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86 if (index < 0)
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87 return NULL;
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88 if (PyList_CheckExact(list)) {
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89 if (PyList_Insert(list, index, item) < 0)
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90 return NULL;
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91 } else {
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92 _Py_IDENTIFIER(insert);
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93
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94 result = _PyObject_CallMethodId(list, &PyId_insert, "nO", index, item);
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95 if (result == NULL)
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96 return NULL;
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97 Py_DECREF(result);
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98 }
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99
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100 Py_RETURN_NONE;
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101 }
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102
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103 PyDoc_STRVAR(insort_right_doc,
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104 "insort_right(a, x[, lo[, hi]])\n\
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105 \n\
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106 Insert item x in list a, and keep it sorted assuming a is sorted.\n\
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107 \n\
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108 If x is already in a, insert it to the right of the rightmost x.\n\
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109 \n\
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110 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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111 slice of a to be searched.\n");
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112
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113 static Py_ssize_t
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114 internal_bisect_left(PyObject *list, PyObject *item, Py_ssize_t lo, Py_ssize_t hi)
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115 {
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116 PyObject *litem;
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117 Py_ssize_t mid, res;
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118
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119 if (lo < 0) {
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120 PyErr_SetString(PyExc_ValueError, "lo must be non-negative");
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121 return -1;
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122 }
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123 if (hi == -1) {
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124 hi = PySequence_Size(list);
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125 if (hi < 0)
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126 return -1;
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127 }
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128 while (lo < hi) {
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129 /* The (size_t)cast ensures that the addition and subsequent division
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130 are performed as unsigned operations, avoiding difficulties from
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131 signed overflow. (See issue 13496.) */
35a3a7e0d66d Issue 13496: Fix bisect.bisect overflow bug for large collections.
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132 mid = ((size_t)lo + hi) / 2;
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133 litem = PySequence_GetItem(list, mid);
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134 if (litem == NULL)
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135 return -1;
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136 res = PyObject_RichCompareBool(litem, item, Py_LT);
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137 Py_DECREF(litem);
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138 if (res < 0)
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139 return -1;
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140 if (res)
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141 lo = mid + 1;
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142 else
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143 hi = mid;
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144 }
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145 return lo;
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146 }
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147
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148 static PyObject *
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149 bisect_left(PyObject *self, PyObject *args, PyObject *kw)
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150 {
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151 PyObject *list, *item;
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152 Py_ssize_t lo = 0;
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153 Py_ssize_t hi = -1;
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154 Py_ssize_t index;
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155 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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156
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157 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:bisect_left",
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158 keywords, &list, &item, &lo, &hi))
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159 return NULL;
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160 index = internal_bisect_left(list, item, lo, hi);
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161 if (index < 0)
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162 return NULL;
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163 return PyLong_FromSsize_t(index);
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164 }
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165
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166 PyDoc_STRVAR(bisect_left_doc,
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167 "bisect_left(a, x[, lo[, hi]]) -> index\n\
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168 \n\
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169 Return the index where to insert item x in list a, assuming a is sorted.\n\
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170 \n\
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171 The return value i is such that all e in a[:i] have e < x, and all e in\n\
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172 a[i:] have e >= x. So if x already appears in the list, i points just\n\
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173 before the leftmost x already there.\n\
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174 \n\
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175 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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176 slice of a to be searched.\n");
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177
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178 static PyObject *
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179 insort_left(PyObject *self, PyObject *args, PyObject *kw)
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180 {
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181 PyObject *list, *item, *result;
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182 Py_ssize_t lo = 0;
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183 Py_ssize_t hi = -1;
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184 Py_ssize_t index;
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185 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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186
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187 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:insort_left",
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188 keywords, &list, &item, &lo, &hi))
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189 return NULL;
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190 index = internal_bisect_left(list, item, lo, hi);
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191 if (index < 0)
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192 return NULL;
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193 if (PyList_CheckExact(list)) {
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194 if (PyList_Insert(list, index, item) < 0)
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195 return NULL;
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196 } else {
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197 _Py_IDENTIFIER(insert);
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198
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199 result = _PyObject_CallMethodId(list, &PyId_insert, "iO", index, item);
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200 if (result == NULL)
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201 return NULL;
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202 Py_DECREF(result);
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203 }
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204
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205 Py_RETURN_NONE;
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206 }
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207
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208 PyDoc_STRVAR(insort_left_doc,
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209 "insort_left(a, x[, lo[, hi]])\n\
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210 \n\
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211 Insert item x in list a, and keep it sorted assuming a is sorted.\n\
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212 \n\
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213 If x is already in a, insert it to the left of the leftmost x.\n\
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214 \n\
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215 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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216 slice of a to be searched.\n");
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217
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218 PyDoc_STRVAR(bisect_doc, "Alias for bisect_right().\n");
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219 PyDoc_STRVAR(insort_doc, "Alias for insort_right().\n");
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220
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221 static PyMethodDef bisect_methods[] = {
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222 {"bisect_right", (PyCFunction)bisect_right,
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223 METH_VARARGS|METH_KEYWORDS, bisect_right_doc},
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224 {"bisect", (PyCFunction)bisect_right,
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225 METH_VARARGS|METH_KEYWORDS, bisect_doc},
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226 {"insort_right", (PyCFunction)insort_right,
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227 METH_VARARGS|METH_KEYWORDS, insort_right_doc},
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228 {"insort", (PyCFunction)insort_right,
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229 METH_VARARGS|METH_KEYWORDS, insort_doc},
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230 {"bisect_left", (PyCFunction)bisect_left,
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231 METH_VARARGS|METH_KEYWORDS, bisect_left_doc},
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232 {"insort_left", (PyCFunction)insort_left,
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233 METH_VARARGS|METH_KEYWORDS, insort_left_doc},
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234 {NULL, NULL} /* sentinel */
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235 };
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236
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237 PyDoc_STRVAR(module_doc,
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238 "Bisection algorithms.\n\
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239 \n\
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240 This module provides support for maintaining a list in sorted order without\n\
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241 having to sort the list after each insertion. For long lists of items with\n\
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242 expensive comparison operations, this can be an improvement over the more\n\
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243 common approach.\n");
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244
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245
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246 static struct PyModuleDef _bisectmodule = {
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247 PyModuleDef_HEAD_INIT,
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248 "_bisect",
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249 module_doc,
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250 -1,
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251 bisect_methods,
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252 NULL,
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253 NULL,
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254 NULL,
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255 NULL
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256 };
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257
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258 PyMODINIT_FUNC
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259 PyInit__bisect(void)
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260 {
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261 return PyModule_Create(&_bisectmodule);
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262 }