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181 lines
6.4 KiB
C
181 lines
6.4 KiB
C
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/* String object interface */
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#ifndef Py_STRINGOBJECT_H
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#define Py_STRINGOBJECT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdarg.h>
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/*
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Type PyStringObject represents a character string. An extra zero byte is
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reserved at the end to ensure it is zero-terminated, but a size is
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present so strings with null bytes in them can be represented. This
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is an immutable object type.
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There are functions to create new string objects, to test
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an object for string-ness, and to get the
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string value. The latter function returns a null pointer
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if the object is not of the proper type.
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There is a variant that takes an explicit size as well as a
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variant that assumes a zero-terminated string. Note that none of the
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functions should be applied to nil objects.
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*/
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/* Caching the hash (ob_shash) saves recalculation of a string's hash value.
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Interning strings (ob_sstate) tries to ensure that only one string
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object with a given value exists, so equality tests can be one pointer
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comparison. This is generally restricted to strings that "look like"
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Python identifiers, although the sys.intern() function can be used to force
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interning of any string.
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Together, these sped the interpreter by up to 20%. */
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typedef struct {
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PyObject_VAR_HEAD
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long ob_shash;
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int ob_sstate;
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char ob_sval[1];
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/* Invariants:
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* ob_sval contains space for 'ob_size+1' elements.
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* ob_sval[ob_size] == 0.
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* ob_shash is the hash of the string or -1 if not computed yet.
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* ob_sstate != 0 iff the string object is in stringobject.c's
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* 'interned' dictionary; in this case the two references
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* from 'interned' to this object are *not counted* in ob_refcnt.
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*/
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} PyStringObject;
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PyAPI_DATA(PyTypeObject) PyBaseString_Type;
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PyAPI_DATA(PyTypeObject) PyString_Type;
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#define PyString_Check(op) \
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PyType_FastSubclass(Py_Type(op), Py_TPFLAGS_STRING_SUBCLASS)
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#define PyString_CheckExact(op) (Py_Type(op) == &PyString_Type)
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PyAPI_FUNC(PyObject *) PyString_FromStringAndSize(const char *, Py_ssize_t);
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PyAPI_FUNC(PyObject *) PyString_FromString(const char *);
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PyAPI_FUNC(PyObject *) PyString_FromFormatV(const char*, va_list)
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Py_GCC_ATTRIBUTE((format(printf, 1, 0)));
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PyAPI_FUNC(PyObject *) PyString_FromFormat(const char*, ...)
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Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
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PyAPI_FUNC(Py_ssize_t) PyString_Size(PyObject *);
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PyAPI_FUNC(char *) PyString_AsString(PyObject *);
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PyAPI_FUNC(PyObject *) PyString_Repr(PyObject *, int);
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PyAPI_FUNC(void) PyString_Concat(PyObject **, PyObject *);
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PyAPI_FUNC(void) PyString_ConcatAndDel(PyObject **, PyObject *);
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PyAPI_FUNC(int) _PyString_Resize(PyObject **, Py_ssize_t);
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PyAPI_FUNC(int) _PyString_Eq(PyObject *, PyObject*);
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PyAPI_FUNC(PyObject *) PyString_Format(PyObject *, PyObject *);
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PyAPI_FUNC(PyObject *) _PyString_FormatLong(PyObject*, int, int,
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int, char**, int*);
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PyAPI_FUNC(PyObject *) PyString_DecodeEscape(const char *, Py_ssize_t,
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const char *, Py_ssize_t,
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const char *);
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PyAPI_FUNC(void) PyString_InternInPlace(PyObject **);
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PyAPI_FUNC(void) PyString_InternImmortal(PyObject **);
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PyAPI_FUNC(PyObject *) PyString_InternFromString(const char *);
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PyAPI_FUNC(void) _Py_ReleaseInternedStrings(void);
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/* Use only if you know it's a string */
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#define PyString_CHECK_INTERNED(op) (((PyStringObject *)(op))->ob_sstate)
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/* Macro, trading safety for speed */
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#define PyString_AS_STRING(op) (assert(PyString_Check(op)),(((PyStringObject *)(op))->ob_sval))
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#define PyString_GET_SIZE(op) (assert(PyString_Check(op)),Py_Size(op))
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/* _PyString_Join(sep, x) is like sep.join(x). sep must be PyStringObject*,
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x must be an iterable object. */
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PyAPI_FUNC(PyObject *) _PyString_Join(PyObject *sep, PyObject *x);
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/* --- Generic Codecs ----------------------------------------------------- */
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/* Create an object by decoding the encoded string s of the
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given size. */
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PyAPI_FUNC(PyObject*) PyString_Decode(
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const char *s, /* encoded string */
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Py_ssize_t size, /* size of buffer */
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const char *encoding, /* encoding */
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const char *errors /* error handling */
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);
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/* Encodes a char buffer of the given size and returns a
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Python object. */
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PyAPI_FUNC(PyObject*) PyString_Encode(
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const char *s, /* string char buffer */
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Py_ssize_t size, /* number of chars to encode */
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const char *encoding, /* encoding */
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const char *errors /* error handling */
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);
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/* Encodes a string object and returns the result as Python
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object. */
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PyAPI_FUNC(PyObject*) PyString_AsEncodedObject(
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PyObject *str, /* string object */
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const char *encoding, /* encoding */
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const char *errors /* error handling */
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);
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/* Encodes a string object and returns the result as Python string
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object.
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If the codec returns an Unicode object, the object is converted
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back to a string using the default encoding.
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DEPRECATED - use PyString_AsEncodedObject() instead. */
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PyAPI_FUNC(PyObject*) PyString_AsEncodedString(
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PyObject *str, /* string object */
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const char *encoding, /* encoding */
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const char *errors /* error handling */
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);
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/* Decodes a string object and returns the result as Python
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object. */
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PyAPI_FUNC(PyObject*) PyString_AsDecodedObject(
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PyObject *str, /* string object */
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const char *encoding, /* encoding */
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const char *errors /* error handling */
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);
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/* Decodes a string object and returns the result as Python string
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object.
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If the codec returns an Unicode object, the object is converted
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back to a string using the default encoding.
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DEPRECATED - use PyString_AsDecodedObject() instead. */
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PyAPI_FUNC(PyObject*) PyString_AsDecodedString(
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PyObject *str, /* string object */
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const char *encoding, /* encoding */
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const char *errors /* error handling */
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);
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/* Provides access to the internal data buffer and size of a string
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object or the default encoded version of an Unicode object. Passing
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NULL as *len parameter will force the string buffer to be
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0-terminated (passing a string with embedded NULL characters will
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cause an exception). */
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PyAPI_FUNC(int) PyString_AsStringAndSize(
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register PyObject *obj, /* string or Unicode object */
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register char **s, /* pointer to buffer variable */
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register Py_ssize_t *len /* pointer to length variable or NULL
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(only possible for 0-terminated
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strings) */
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);
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_STRINGOBJECT_H */
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