Mercurial > cpython-lru_cache-weakref

annotate Include/stringobject.h @ 19975:4e445a3e07c6 legacy-trunk

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Enable two checks for comparing a complex to a complex subtype instance. Split a string comparison test in two halves, replacing "a==b==a" with separate tests for a==b and b==a. (Reason: while experimenting, this test failed, and I wanted to know if it was the first or the second == operator that failed.)
author Guido van Rossum <guido@python.org>
date Wed, 19 Sep 2001 01:16:16 +0000
parents 662e22f99639
children 3d299b156511
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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853b736a6a9e Added copyright notice.
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1
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2 /* String object interface */
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3
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4 #ifndef Py_STRINGOBJECT_H
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5 #define Py_STRINGOBJECT_H
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6 #ifdef __cplusplus
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7 extern "C" {
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8 #endif
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9
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10 #include <stdarg.h>
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12 /*
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13 Type PyStringObject represents a character string. An extra zero byte is
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14 reserved at the end to ensure it is zero-terminated, but a size is
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15 present so strings with null bytes in them can be represented. This
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16 is an immutable object type.
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17
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18 There are functions to create new string objects, to test
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19 an object for string-ness, and to get the
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20 string value. The latter function returns a null pointer
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21 if the object is not of the proper type.
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22 There is a variant that takes an explicit size as well as a
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23 variant that assumes a zero-terminated string. Note that none of the
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24 functions should be applied to nil objects.
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25 */
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26
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27 /* Two speedup hacks. Caching the hash saves recalculation of a
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28 string's hash value. Interning strings (which requires hash
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29 caching) tries to ensure that only one string object with a given
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30 value exists, so equality tests are one pointer comparison.
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31 Together, these can speed the interpreter up by as much as 20%.
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32 Each costs the size of a long or pointer per string object. In
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33 addition, interned strings live until the end of times. If you are
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34 concerned about memory footprint, simply comment the #define out
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35 here (and rebuild everything!). */
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36 #define CACHE_HASH
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37 #ifdef CACHE_HASH
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38 #define INTERN_STRINGS
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39 #endif
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40
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41 typedef struct {
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42 PyObject_VAR_HEAD
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43 #ifdef CACHE_HASH
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44 long ob_shash;
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45 #endif
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46 #ifdef INTERN_STRINGS
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47 PyObject *ob_sinterned;
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48 #endif
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49 char ob_sval[1];
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50 } PyStringObject;
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51
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52 extern DL_IMPORT(PyTypeObject) PyString_Type;
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53
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54 #define PyString_Check(op) PyObject_TypeCheck(op, &PyString_Type)
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55 #define PyString_CheckExact(op) ((op)->ob_type == &PyString_Type)
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57 extern DL_IMPORT(PyObject *) PyString_FromStringAndSize(const char *, int);
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58 extern DL_IMPORT(PyObject *) PyString_FromString(const char *);
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59 extern DL_IMPORT(PyObject *) PyString_FromFormatV(const char*, va_list);
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60 extern DL_IMPORT(PyObject *) PyString_FromFormat(const char*, ...);
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61 extern DL_IMPORT(int) PyString_Size(PyObject *);
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62 extern DL_IMPORT(char *) PyString_AsString(PyObject *);
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63 extern DL_IMPORT(void) PyString_Concat(PyObject **, PyObject *);
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64 extern DL_IMPORT(void) PyString_ConcatAndDel(PyObject **, PyObject *);
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65 extern DL_IMPORT(int) _PyString_Resize(PyObject **, int);
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66 extern DL_IMPORT(int) _PyString_Eq(PyObject *, PyObject*);
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67 extern DL_IMPORT(PyObject *) PyString_Format(PyObject *, PyObject *);
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68 extern DL_IMPORT(PyObject *) _PyString_FormatLong(PyObject*, int, int,
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69 int, char**, int*);
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71 #ifdef INTERN_STRINGS
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72 extern DL_IMPORT(void) PyString_InternInPlace(PyObject **);
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73 extern DL_IMPORT(PyObject *) PyString_InternFromString(const char *);
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74 extern DL_IMPORT(void) _Py_ReleaseInternedStrings(void);
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75 #else
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76 #define PyString_InternInPlace(p)
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77 #define PyString_InternFromString(cp) PyString_FromString(cp)
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78 #define _Py_ReleaseInternedStrings()
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79 #endif
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80
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81 /* Macro, trading safety for speed */
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82 #define PyString_AS_STRING(op) (((PyStringObject *)(op))->ob_sval)
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83 #define PyString_GET_SIZE(op) (((PyStringObject *)(op))->ob_size)
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84
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85 /* _PyString_Join(sep, x) is like sep.join(x). sep must be PyStringObject*,
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86 x must be an iterable object. */
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87 extern DL_IMPORT(PyObject *) _PyString_Join(PyObject *sep, PyObject *x);
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88
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89 /* --- Generic Codecs ----------------------------------------------------- */
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90
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91 /* Create an object by decoding the encoded string s of the
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92 given size. */
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93
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94 extern DL_IMPORT(PyObject*) PyString_Decode(
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95 const char *s, /* encoded string */
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96 int size, /* size of buffer */
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97 const char *encoding, /* encoding */
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98 const char *errors /* error handling */
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99 );
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100
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101 /* Encodes a char buffer of the given size and returns a
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102 Python object. */
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103
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104 extern DL_IMPORT(PyObject*) PyString_Encode(
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105 const char *s, /* string char buffer */
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106 int size, /* number of chars to encode */
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107 const char *encoding, /* encoding */
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108 const char *errors /* error handling */
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109 );
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110
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111 /* Encodes a string object and returns the result as Python
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112 object. */
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113
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114 extern DL_IMPORT(PyObject*) PyString_AsEncodedObject(
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115 PyObject *str, /* string object */
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116 const char *encoding, /* encoding */
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117 const char *errors /* error handling */
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118 );
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119
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120 /* Encodes a string object and returns the result as Python string
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121 object.
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122
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123 If the codec returns an Unicode object, the object is converted
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124 back to a string using the default encoding.
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125
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126 DEPRECATED - use PyString_AsEncodedObject() instead. */
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127
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128 extern DL_IMPORT(PyObject*) PyString_AsEncodedString(
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129 PyObject *str, /* string object */
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130 const char *encoding, /* encoding */
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131 const char *errors /* error handling */
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132 );
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133
17835
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134 /* Decodes a string object and returns the result as Python
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135 object. */
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136
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137 extern DL_IMPORT(PyObject*) PyString_AsDecodedObject(
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138 PyObject *str, /* string object */
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139 const char *encoding, /* encoding */
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140 const char *errors /* error handling */
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141 );
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142
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143 /* Decodes a string object and returns the result as Python string
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144 object.
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145
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146 If the codec returns an Unicode object, the object is converted
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147 back to a string using the default encoding.
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148
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149 DEPRECATED - use PyString_AsDecodedObject() instead. */
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150
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151 extern DL_IMPORT(PyObject*) PyString_AsDecodedString(
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152 PyObject *str, /* string object */
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153 const char *encoding, /* encoding */
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154 const char *errors /* error handling */
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155 );
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156
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157 /* Provides access to the internal data buffer and size of a string
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158 object or the default encoded version of an Unicode object. Passing
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159 NULL as *len parameter will force the string buffer to be
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160 0-terminated (passing a string with embedded NULL characters will
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161 cause an exception). */
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162
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163 extern DL_IMPORT(int) PyString_AsStringAndSize(
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164 register PyObject *obj, /* string or Unicode object */
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165 register char **s, /* pointer to buffer variable */
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166 register int *len /* pointer to length variable or NULL
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167 (only possible for 0-terminated
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168 strings) */
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169 );
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170
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171
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172 #ifdef __cplusplus
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173 }
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174 #endif
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175 #endif /* !Py_STRINGOBJECT_H */