Mercurial > cpython-lru_cache-weakref

annotate Objects/stringlib/find.h @ 47949:6c1237cb5aaa legacy-trunk

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Re-word
author Andrew M. Kuchling <amk@amk.ca>
date Sun, 13 Jul 2008 21:43:25 +0000
parents 1fb353776dfb
children bce03f87f65d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* stringlib: find/index implementation */
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2
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3 #ifndef STRINGLIB_FIND_H
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4 #define STRINGLIB_FIND_H
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5
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6 #ifndef STRINGLIB_FASTSEARCH_H
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7 #error must include "stringlib/fastsearch.h" before including this module
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8 #endif
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9
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10 Py_LOCAL_INLINE(Py_ssize_t)
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11 stringlib_find(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
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12 const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
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13 Py_ssize_t offset)
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14 {
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15 Py_ssize_t pos;
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16
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17 if (sub_len == 0) {
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18 if (str_len < 0)
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19 return -1;
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20 return offset;
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21 }
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22
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23 pos = fastsearch(str, str_len, sub, sub_len, FAST_SEARCH);
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24
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25 if (pos >= 0)
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26 pos += offset;
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27
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28 return pos;
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29 }
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30
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31 Py_LOCAL_INLINE(Py_ssize_t)
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32 stringlib_rfind(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
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33 const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
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34 Py_ssize_t offset)
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35 {
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36 /* XXX - create reversefastsearch helper! */
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37 if (sub_len == 0) {
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38 if (str_len < 0)
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39 return -1;
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40 return str_len + offset;
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41 } else {
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42 Py_ssize_t j, pos = -1;
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43 for (j = str_len - sub_len; j >= 0; --j)
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44 if (STRINGLIB_CMP(str+j, sub, sub_len) == 0) {
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45 pos = j + offset;
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46 break;
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47 }
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48 return pos;
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49 }
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50 }
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51
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52 Py_LOCAL_INLINE(Py_ssize_t)
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53 stringlib_find_slice(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
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54 const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
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55 Py_ssize_t start, Py_ssize_t end)
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56 {
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57 if (start < 0)
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58 start += str_len;
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59 if (start < 0)
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60 start = 0;
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61 if (end > str_len)
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62 end = str_len;
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63 if (end < 0)
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64 end += str_len;
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65 if (end < 0)
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66 end = 0;
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67
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68 return stringlib_find(
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69 str + start, end - start,
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70 sub, sub_len, start
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71 );
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72 }
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73
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74 Py_LOCAL_INLINE(Py_ssize_t)
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75 stringlib_rfind_slice(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
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76 const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
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77 Py_ssize_t start, Py_ssize_t end)
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78 {
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79 if (start < 0)
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80 start += str_len;
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81 if (start < 0)
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82 start = 0;
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83 if (end > str_len)
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84 end = str_len;
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85 if (end < 0)
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86 end += str_len;
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87 if (end < 0)
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88 end = 0;
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89
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90 return stringlib_rfind(str + start, end - start, sub, sub_len, start);
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91 }
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92
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93 #ifdef STRINGLIB_STR
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94
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95 Py_LOCAL_INLINE(int)
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96 stringlib_contains_obj(PyObject* str, PyObject* sub)
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97 {
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98 return stringlib_find(
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99 STRINGLIB_STR(str), STRINGLIB_LEN(str),
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100 STRINGLIB_STR(sub), STRINGLIB_LEN(sub), 0
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101 ) != -1;
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102 }
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103
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104 #endif /* STRINGLIB_STR */
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105
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106 #ifdef FROM_UNICODE
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107
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108 /*
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109 This function is a helper for the "find" family (find, rfind, index,
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110 rindex) of unicodeobject.c file, because they all have the same
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111 behaviour for the arguments.
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112
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113 It does not touch the variables received until it knows everything
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114 is ok.
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115
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116 Note that we receive a pointer to the pointer of the substring object,
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117 so when we create that object in this function we don't DECREF it,
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118 because it continues living in the caller functions (those functions,
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119 after finishing using the substring, must DECREF it).
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120 */
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121
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122 Py_LOCAL_INLINE(int)
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123 _ParseTupleFinds (PyObject *args, PyObject **substring,
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124 Py_ssize_t *start, Py_ssize_t *end) {
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parents: 38514
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125 PyObject *tmp_substring;
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126 Py_ssize_t tmp_start = 0;
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127 Py_ssize_t tmp_end = PY_SSIZE_T_MAX;
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128 PyObject *obj_start=Py_None, *obj_end=Py_None;
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129
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130 if (!PyArg_ParseTuple(args, "O|OO:find", &tmp_substring,
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131 &obj_start, &obj_end))
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132 return 0;
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133
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134 /* To support None in "start" and "end" arguments, meaning
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parents: 38514
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135 the same as if they were not passed.
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136 */
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137 if (obj_start != Py_None)
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138 if (!_PyEval_SliceIndex(obj_start, &tmp_start))
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139 return 0;
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parents: 38514
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140 if (obj_end != Py_None)
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parents: 38514
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141 if (!_PyEval_SliceIndex(obj_end, &tmp_end))
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142 return 0;
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143
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144 tmp_substring = PyUnicode_FromObject(tmp_substring);
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parents: 38514
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145 if (!tmp_substring)
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146 return 0;
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147
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148 *start = tmp_start;
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149 *end = tmp_end;
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150 *substring = tmp_substring;
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151 return 1;
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152 }
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153
43888
1fb353776dfb Made _ParseTupleFinds only defined to unicodeobject.c
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154 #endif /* FROM_UNICODE */
43886
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155
38441
72327f8f4a79 needforspeed: stringlib refactoring: changed find_obj to find_slice,
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156 #endif /* STRINGLIB_FIND_H */
38400
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157
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158 /*
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159 Local variables:
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160 c-basic-offset: 4
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161 indent-tabs-mode: nil
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162 End:
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163 */