Mercurial > cpython-lru_cache-weakref

annotate Objects/stringlib/find.h @ 64166:d0e9febfa00a 3.1

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Merged revisions 84172 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r84172 | martin.v.loewis | 2010-08-18 18:12:23 +0200 (Mi, 18 Aug 2010) | 2 lines Restore GIL in nis_cat in case of error. ........
author Martin v. Löwis <martin@v.loewis.de>
date Thu, 19 Aug 2010 09:03:03 +0000
parents 6403f1edecc1
children 77c657e47b5c a1035cb4a925
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 (str_len < 0)
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18 return -1;
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19 if (sub_len == 0)
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20 return offset;
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21
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22 pos = fastsearch(str, str_len, sub, sub_len, FAST_SEARCH);
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23
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24 if (pos >= 0)
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25 pos += offset;
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26
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27 return pos;
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28 }
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29
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30 Py_LOCAL_INLINE(Py_ssize_t)
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31 stringlib_rfind(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
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32 const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
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33 Py_ssize_t offset)
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34 {
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35 /* XXX - create reversefastsearch helper! */
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36 if (sub_len == 0) {
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37 if (str_len < 0)
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38 return -1;
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39 return str_len + offset;
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40 } else {
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41 Py_ssize_t j, pos = -1;
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42 for (j = str_len - sub_len; j >= 0; --j)
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43 if (STRINGLIB_CMP(str+j, sub, sub_len) == 0) {
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44 pos = j + offset;
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45 break;
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46 }
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47 return pos;
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48 }
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49 }
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50
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51 Py_LOCAL_INLINE(Py_ssize_t)
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52 stringlib_find_slice(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
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53 const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
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54 Py_ssize_t start, Py_ssize_t end)
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55 {
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56 if (start < 0)
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57 start += str_len;
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58 if (start < 0)
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59 start = 0;
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60 if (end > str_len)
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61 end = str_len;
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62 if (end < 0)
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63 end += str_len;
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64 if (end < 0)
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65 end = 0;
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66
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67 return stringlib_find(
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68 str + start, end - start,
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69 sub, sub_len, start
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70 );
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71 }
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72
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73 Py_LOCAL_INLINE(Py_ssize_t)
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74 stringlib_rfind_slice(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
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75 const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
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76 Py_ssize_t start, Py_ssize_t end)
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77 {
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78 if (start < 0)
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79 start += str_len;
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80 if (start < 0)
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81 start = 0;
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82 if (end > str_len)
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83 end = str_len;
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84 if (end < 0)
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85 end += str_len;
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86 if (end < 0)
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87 end = 0;
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88
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89 return stringlib_rfind(str + start, end - start, sub, sub_len, start);
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90 }
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91
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92 #ifdef STRINGLIB_WANT_CONTAINS_OBJ
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93
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94 Py_LOCAL_INLINE(int)
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95 stringlib_contains_obj(PyObject* str, PyObject* sub)
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96 {
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97 return stringlib_find(
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98 STRINGLIB_STR(str), STRINGLIB_LEN(str),
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99 STRINGLIB_STR(sub), STRINGLIB_LEN(sub), 0
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100 ) != -1;
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101 }
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102
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103 #endif /* STRINGLIB_STR */
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104
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105 #ifdef FROM_UNICODE
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106
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107 /*
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108 This function is a helper for the "find" family (find, rfind, index,
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109 rindex) of unicodeobject.c file, because they all have the same
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110 behaviour for the arguments.
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111
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112 It does not touch the variables received until it knows everything
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113 is ok.
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114
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115 Note that we receive a pointer to the pointer of the substring object,
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116 so when we create that object in this function we don't DECREF it,
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117 because it continues living in the caller functions (those functions,
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118 after finishing using the substring, must DECREF it).
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119 */
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120
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121 Py_LOCAL_INLINE(int)
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122 _ParseTupleFinds (PyObject *args, PyObject **substring,
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123 Py_ssize_t *start, Py_ssize_t *end) {
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124 PyObject *tmp_substring;
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125 Py_ssize_t tmp_start = 0;
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126 Py_ssize_t tmp_end = PY_SSIZE_T_MAX;
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127 PyObject *obj_start=Py_None, *obj_end=Py_None;
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128
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129 if (!PyArg_ParseTuple(args, "O|OO:find", &tmp_substring,
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130 &obj_start, &obj_end))
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131 return 0;
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132
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133 /* To support None in "start" and "end" arguments, meaning
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134 the same as if they were not passed.
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135 */
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136 if (obj_start != Py_None)
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137 if (!_PyEval_SliceIndex(obj_start, &tmp_start))
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138 return 0;
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139 if (obj_end != Py_None)
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140 if (!_PyEval_SliceIndex(obj_end, &tmp_end))
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141 return 0;
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142
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143 tmp_substring = PyUnicode_FromObject(tmp_substring);
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144 if (!tmp_substring)
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145 return 0;
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146
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147 *start = tmp_start;
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148 *end = tmp_end;
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149 *substring = tmp_substring;
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150 return 1;
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151 }
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152
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153 #endif /* FROM_UNICODE */
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154
38453
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155 #endif /* STRINGLIB_FIND_H */
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156
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157 /*
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158 Local variables:
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159 c-basic-offset: 4
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160 indent-tabs-mode: nil
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161 End:
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162 */