annotate Include/stringobject.h @ 68239:ceec209b26d4 2.4

Close 2.4 branch.
author Georg Brandl <georg@python.org>
date Sat, 05 Mar 2011 14:56:41 +0100
parents 60c60dc75c77
children 7fdc639bc5b4
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1
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2 /* String object interface */
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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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27 /* Caching the hash (ob_shash) saves recalculation of a string's hash value.
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28 Interning strings (ob_sstate) tries to ensure that only one string
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29 object with a given value exists, so equality tests can be one pointer
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30 comparison. This is generally restricted to strings that "look like"
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31 Python identifiers, although the intern() builtin can be used to force
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32 interning of any string.
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33 Together, these sped the interpreter by up to 20%. */
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34
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35 typedef struct {
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36 PyObject_VAR_HEAD
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37 long ob_shash;
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38 int ob_sstate;
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39 char ob_sval[1];
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40
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41 /* Invariants:
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42 * ob_sval contains space for 'ob_size+1' elements.
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43 * ob_sval[ob_size] == 0.
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44 * ob_shash is the hash of the string or -1 if not computed yet.
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45 * ob_sstate != 0 iff the string object is in stringobject.c's
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46 * 'interned' dictionary; in this case the two references
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47 * from 'interned' to this object are *not counted* in ob_refcnt.
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48 */
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49 } PyStringObject;
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50
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51 #define SSTATE_NOT_INTERNED 0
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52 #define SSTATE_INTERNED_MORTAL 1
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53 #define SSTATE_INTERNED_IMMORTAL 2
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54
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55 PyAPI_DATA(PyTypeObject) PyBaseString_Type;
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56 PyAPI_DATA(PyTypeObject) PyString_Type;
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58 #define PyString_Check(op) PyObject_TypeCheck(op, &PyString_Type)
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59 #define PyString_CheckExact(op) ((op)->ob_type == &PyString_Type)
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61 PyAPI_FUNC(PyObject *) PyString_FromStringAndSize(const char *, int);
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62 PyAPI_FUNC(PyObject *) PyString_FromString(const char *);
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63 PyAPI_FUNC(PyObject *) PyString_FromFormatV(const char*, va_list)
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64 Py_GCC_ATTRIBUTE((format(printf, 1, 0)));
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65 PyAPI_FUNC(PyObject *) PyString_FromFormat(const char*, ...)
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66 Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
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67 PyAPI_FUNC(int) PyString_Size(PyObject *);
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68 PyAPI_FUNC(char *) PyString_AsString(PyObject *);
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69 PyAPI_FUNC(PyObject *) PyString_Repr(PyObject *, int);
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70 PyAPI_FUNC(void) PyString_Concat(PyObject **, PyObject *);
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71 PyAPI_FUNC(void) PyString_ConcatAndDel(PyObject **, PyObject *);
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72 PyAPI_FUNC(int) _PyString_Resize(PyObject **, int);
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73 PyAPI_FUNC(int) _PyString_Eq(PyObject *, PyObject*);
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74 PyAPI_FUNC(PyObject *) PyString_Format(PyObject *, PyObject *);
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75 PyAPI_FUNC(PyObject *) _PyString_FormatLong(PyObject*, int, int,
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76 int, char**, int*);
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77 PyAPI_FUNC(PyObject *) PyString_DecodeEscape(const char *, int,
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78 const char *, int,
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79 const char *);
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80
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81 PyAPI_FUNC(void) PyString_InternInPlace(PyObject **);
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82 PyAPI_FUNC(void) PyString_InternImmortal(PyObject **);
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83 PyAPI_FUNC(PyObject *) PyString_InternFromString(const char *);
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84 PyAPI_FUNC(void) _Py_ReleaseInternedStrings(void);
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85
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86 /* Use only if you know it's a string */
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87 #define PyString_CHECK_INTERNED(op) (((PyStringObject *)(op))->ob_sstate)
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89 /* Macro, trading safety for speed */
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90 #define PyString_AS_STRING(op) (((PyStringObject *)(op))->ob_sval)
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91 #define PyString_GET_SIZE(op) (((PyStringObject *)(op))->ob_size)
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92
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93 /* _PyString_Join(sep, x) is like sep.join(x). sep must be PyStringObject*,
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94 x must be an iterable object. */
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95 PyAPI_FUNC(PyObject *) _PyString_Join(PyObject *sep, PyObject *x);
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96
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97 /* --- Generic Codecs ----------------------------------------------------- */
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98
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99 /* Create an object by decoding the encoded string s of the
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100 given size. */
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101
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102 PyAPI_FUNC(PyObject*) PyString_Decode(
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103 const char *s, /* encoded string */
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104 int size, /* size of buffer */
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105 const char *encoding, /* encoding */
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106 const char *errors /* error handling */
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107 );
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108
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109 /* Encodes a char buffer of the given size and returns a
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110 Python object. */
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111
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112 PyAPI_FUNC(PyObject*) PyString_Encode(
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113 const char *s, /* string char buffer */
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114 int size, /* number of chars to encode */
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115 const char *encoding, /* encoding */
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116 const char *errors /* error handling */
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117 );
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118
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119 /* Encodes a string object and returns the result as Python
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120 object. */
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121
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122 PyAPI_FUNC(PyObject*) PyString_AsEncodedObject(
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123 PyObject *str, /* string object */
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124 const char *encoding, /* encoding */
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125 const char *errors /* error handling */
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126 );
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127
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128 /* Encodes a string object and returns the result as Python string
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129 object.
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130
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131 If the codec returns an Unicode object, the object is converted
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132 back to a string using the default encoding.
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133
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134 DEPRECATED - use PyString_AsEncodedObject() instead. */
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135
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136 PyAPI_FUNC(PyObject*) PyString_AsEncodedString(
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137 PyObject *str, /* string object */
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138 const char *encoding, /* encoding */
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139 const char *errors /* error handling */
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140 );
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141
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142 /* Decodes a string object and returns the result as Python
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143 object. */
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144
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145 PyAPI_FUNC(PyObject*) PyString_AsDecodedObject(
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146 PyObject *str, /* string object */
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147 const char *encoding, /* encoding */
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148 const char *errors /* error handling */
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149 );
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150
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151 /* Decodes a string object and returns the result as Python string
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152 object.
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153
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154 If the codec returns an Unicode object, the object is converted
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155 back to a string using the default encoding.
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156
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157 DEPRECATED - use PyString_AsDecodedObject() instead. */
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158
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159 PyAPI_FUNC(PyObject*) PyString_AsDecodedString(
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160 PyObject *str, /* string object */
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161 const char *encoding, /* encoding */
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162 const char *errors /* error handling */
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163 );
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164
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165 /* Provides access to the internal data buffer and size of a string
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166 object or the default encoded version of an Unicode object. Passing
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167 NULL as *len parameter will force the string buffer to be
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168 0-terminated (passing a string with embedded NULL characters will
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169 cause an exception). */
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170
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171 PyAPI_FUNC(int) PyString_AsStringAndSize(
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172 register PyObject *obj, /* string or Unicode object */
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173 register char **s, /* pointer to buffer variable */
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174 register int *len /* pointer to length variable or NULL
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175 (only possible for 0-terminated
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176 strings) */
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177 );
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178
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179
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180 #ifdef __cplusplus
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181 }
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182 #endif
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183 #endif /* !Py_STRINGOBJECT_H */