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unicodeobject.c
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unicodeobject.c
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/*
Unicode implementation based on original code by Fredrik Lundh,
modified by Marc-Andre Lemburg <mal@lemburg.com>.
Major speed upgrades to the method implementations at the Reykjavik
NeedForSpeed sprint, by Fredrik Lundh and Andrew Dalke.
Copyright (c) Corporation for National Research Initiatives.
--------------------------------------------------------------------
The original string type implementation is:
Copyright (c) 1999 by Secret Labs AB
Copyright (c) 1999 by Fredrik Lundh
By obtaining, using, and/or copying this software and/or its
associated documentation, you agree that you have read, understood,
and will comply with the following terms and conditions:
Permission to use, copy, modify, and distribute this software and its
associated documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appears in all
copies, and that both that copyright notice and this permission notice
appear in supporting documentation, and that the name of Secret Labs
AB or the author not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior
permission.
SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS. IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR BE LIABLE FOR
ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
--------------------------------------------------------------------
*/
#include "Python.h"
#include "pycore_abstract.h" // _PyIndex_Check()
#include "pycore_bytes_methods.h" // _Py_bytes_lower()
#include "pycore_bytesobject.h" // _PyBytes_Repeat()
#include "pycore_ceval.h" // _PyEval_GetBuiltin()
#include "pycore_codecs.h" // _PyCodec_Lookup()
#include "pycore_format.h" // F_LJUST
#include "pycore_initconfig.h" // _PyStatus_OK()
#include "pycore_interp.h" // PyInterpreterState.fs_codec
#include "pycore_long.h" // _PyLong_FormatWriter()
#include "pycore_object.h" // _PyObject_GC_TRACK(), _Py_FatalRefcountError()
#include "pycore_pathconfig.h" // _Py_DumpPathConfig()
#include "pycore_pyerrors.h" // _PyUnicodeTranslateError_Create()
#include "pycore_pylifecycle.h" // _Py_SetFileSystemEncoding()
#include "pycore_pystate.h" // _PyInterpreterState_GET()
#include "pycore_ucnhash.h" // _PyUnicode_Name_CAPI
#include "pycore_unicodeobject.h" // struct _Py_unicode_state
#include "pycore_unicodeobject_generated.h" // _PyUnicode_InitStaticStrings()
#include "stringlib/eq.h" // unicode_eq()
#include <stddef.h> // ptrdiff_t
#ifdef MS_WINDOWS
#include <windows.h>
#endif
#ifdef HAVE_NON_UNICODE_WCHAR_T_REPRESENTATION
# include "pycore_fileutils.h" // _Py_LocaleUsesNonUnicodeWchar()
#endif
/* Uncomment to display statistics on interned strings at exit
in _PyUnicode_ClearInterned(). */
/* #define INTERNED_STATS 1 */
/*[clinic input]
class str "PyObject *" "&PyUnicode_Type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=4884c934de622cf6]*/
/*[python input]
class Py_UCS4_converter(CConverter):
type = 'Py_UCS4'
converter = 'convert_uc'
def converter_init(self):
if self.default is not unspecified:
self.c_default = ascii(self.default)
if len(self.c_default) > 4 or self.c_default[0] != "'":
self.c_default = hex(ord(self.default))
[python start generated code]*/
/*[python end generated code: output=da39a3ee5e6b4b0d input=88f5dd06cd8e7a61]*/
/* --- Globals ------------------------------------------------------------
NOTE: In the interpreter's initialization phase, some globals are currently
initialized dynamically as needed. In the process Unicode objects may
be created before the Unicode type is ready.
*/
// Maximum code point of Unicode 6.0: 0x10ffff (1,114,111).
// The value must be the same in fileutils.c.
#define MAX_UNICODE 0x10ffff
#ifdef Py_DEBUG
# define _PyUnicode_CHECK(op) _PyUnicode_CheckConsistency(op, 0)
#else
# define _PyUnicode_CHECK(op) PyUnicode_Check(op)
#endif
#define _PyUnicode_UTF8(op) \
(_PyCompactUnicodeObject_CAST(op)->utf8)
#define PyUnicode_UTF8(op) \
(assert(_PyUnicode_CHECK(op)), \
PyUnicode_IS_COMPACT_ASCII(op) ? \
((char*)(_PyASCIIObject_CAST(op) + 1)) : \
_PyUnicode_UTF8(op))
#define _PyUnicode_UTF8_LENGTH(op) \
(_PyCompactUnicodeObject_CAST(op)->utf8_length)
#define PyUnicode_UTF8_LENGTH(op) \
(assert(_PyUnicode_CHECK(op)), \
PyUnicode_IS_COMPACT_ASCII(op) ? \
_PyASCIIObject_CAST(op)->length : \
_PyUnicode_UTF8_LENGTH(op))
#define _PyUnicode_LENGTH(op) \
(_PyASCIIObject_CAST(op)->length)
#define _PyUnicode_STATE(op) \
(_PyASCIIObject_CAST(op)->state)
#define _PyUnicode_HASH(op) \
(_PyASCIIObject_CAST(op)->hash)
#define _PyUnicode_KIND(op) \
(assert(_PyUnicode_CHECK(op)), \
_PyASCIIObject_CAST(op)->state.kind)
#define _PyUnicode_GET_LENGTH(op) \
(assert(_PyUnicode_CHECK(op)), \
_PyASCIIObject_CAST(op)->length)
#define _PyUnicode_DATA_ANY(op) \
(_PyUnicodeObject_CAST(op)->data.any)
#define _PyUnicode_SHARE_UTF8(op) \
(assert(_PyUnicode_CHECK(op)), \
assert(!PyUnicode_IS_COMPACT_ASCII(op)), \
(_PyUnicode_UTF8(op) == PyUnicode_DATA(op)))
/* true if the Unicode object has an allocated UTF-8 memory block
(not shared with other data) */
#define _PyUnicode_HAS_UTF8_MEMORY(op) \
((!PyUnicode_IS_COMPACT_ASCII(op) \
&& _PyUnicode_UTF8(op) \
&& _PyUnicode_UTF8(op) != PyUnicode_DATA(op)))
/* Generic helper macro to convert characters of different types.
from_type and to_type have to be valid type names, begin and end
are pointers to the source characters which should be of type
"from_type *". to is a pointer of type "to_type *" and points to the
buffer where the result characters are written to. */
#define _PyUnicode_CONVERT_BYTES(from_type, to_type, begin, end, to) \
do { \
to_type *_to = (to_type *)(to); \
const from_type *_iter = (const from_type *)(begin);\
const from_type *_end = (const from_type *)(end);\
Py_ssize_t n = (_end) - (_iter); \
const from_type *_unrolled_end = \
_iter + _Py_SIZE_ROUND_DOWN(n, 4); \
while (_iter < (_unrolled_end)) { \
_to[0] = (to_type) _iter[0]; \
_to[1] = (to_type) _iter[1]; \
_to[2] = (to_type) _iter[2]; \
_to[3] = (to_type) _iter[3]; \
_iter += 4; _to += 4; \
} \
while (_iter < (_end)) \
*_to++ = (to_type) *_iter++; \
} while (0)
#define LATIN1(ch) \
(ch < 128 \
? (PyObject*)&_Py_SINGLETON(strings).ascii[ch] \
: (PyObject*)&_Py_SINGLETON(strings).latin1[ch - 128])
#ifdef MS_WINDOWS
/* On Windows, overallocate by 50% is the best factor */
# define OVERALLOCATE_FACTOR 2
#else
/* On Linux, overallocate by 25% is the best factor */
# define OVERALLOCATE_FACTOR 4
#endif
/* Forward declaration */
static inline int
_PyUnicodeWriter_WriteCharInline(_PyUnicodeWriter *writer, Py_UCS4 ch);
static inline void
_PyUnicodeWriter_InitWithBuffer(_PyUnicodeWriter *writer, PyObject *buffer);
static PyObject *
unicode_encode_utf8(PyObject *unicode, _Py_error_handler error_handler,
const char *errors);
static PyObject *
unicode_decode_utf8(const char *s, Py_ssize_t size,
_Py_error_handler error_handler, const char *errors,
Py_ssize_t *consumed);
#ifdef Py_DEBUG
static inline int unicode_is_finalizing(void);
static int unicode_is_singleton(PyObject *unicode);
#endif
// Return a reference to the immortal empty string singleton.
static inline PyObject* unicode_get_empty(void)
{
_Py_DECLARE_STR(empty, "");
return &_Py_STR(empty);
}
/* This dictionary holds all interned unicode strings. Note that references
to strings in this dictionary are *not* counted in the string's ob_refcnt.
When the interned string reaches a refcnt of 0 the string deallocation
function will delete the reference from this dictionary.
*/
static inline PyObject *get_interned_dict(PyInterpreterState *interp)
{
return _Py_INTERP_CACHED_OBJECT(interp, interned_strings);
}
#define INTERNED_STRINGS _PyRuntime.cached_objects.interned_strings
Py_ssize_t
_PyUnicode_InternedSize(void)
{
PyObject *dict = get_interned_dict(_PyInterpreterState_GET());
return _Py_hashtable_len(INTERNED_STRINGS) + PyDict_GET_SIZE(dict);
}
static Py_hash_t unicode_hash(PyObject *);
static int unicode_compare_eq(PyObject *, PyObject *);
static Py_uhash_t
hashtable_unicode_hash(const void *key)
{
return unicode_hash((PyObject *)key);
}
static int
hashtable_unicode_compare(const void *key1, const void *key2)
{
PyObject *obj1 = (PyObject *)key1;
PyObject *obj2 = (PyObject *)key2;
if (obj1 != NULL && obj2 != NULL) {
return unicode_compare_eq(obj1, obj2);
}
else {
return obj1 == obj2;
}
}
static int
init_interned_dict(PyInterpreterState *interp)
{
if (_Py_IsMainInterpreter(interp)) {
assert(INTERNED_STRINGS == NULL);
_Py_hashtable_allocator_t hashtable_alloc = {PyMem_RawMalloc, PyMem_RawFree};
INTERNED_STRINGS = _Py_hashtable_new_full(
hashtable_unicode_hash,
hashtable_unicode_compare,
NULL,
NULL,
&hashtable_alloc
);
if (INTERNED_STRINGS == NULL) {
return -1;
}
}
assert(get_interned_dict(interp) == NULL);
PyObject *interned = interned = PyDict_New();
if (interned == NULL) {
return -1;
}
_Py_INTERP_CACHED_OBJECT(interp, interned_strings) = interned;
return 0;
}
static void
clear_interned_dict(PyInterpreterState *interp)
{
PyObject *interned = get_interned_dict(interp);
if (interned != NULL) {
PyDict_Clear(interned);
Py_DECREF(interned);
_Py_INTERP_CACHED_OBJECT(interp, interned_strings) = NULL;
}
if (_Py_IsMainInterpreter(interp) && INTERNED_STRINGS != NULL) {
_Py_hashtable_destroy(INTERNED_STRINGS);
INTERNED_STRINGS = NULL;
}
}
#define _Py_RETURN_UNICODE_EMPTY() \
do { \
return unicode_get_empty(); \
} while (0)
static inline void
unicode_fill(int kind, void *data, Py_UCS4 value,
Py_ssize_t start, Py_ssize_t length)
{
assert(0 <= start);
switch (kind) {
case PyUnicode_1BYTE_KIND: {
assert(value <= 0xff);
Py_UCS1 ch = (unsigned char)value;
Py_UCS1 *to = (Py_UCS1 *)data + start;
memset(to, ch, length);
break;
}
case PyUnicode_2BYTE_KIND: {
assert(value <= 0xffff);
Py_UCS2 ch = (Py_UCS2)value;
Py_UCS2 *to = (Py_UCS2 *)data + start;
const Py_UCS2 *end = to + length;
for (; to < end; ++to) *to = ch;
break;
}
case PyUnicode_4BYTE_KIND: {
assert(value <= MAX_UNICODE);
Py_UCS4 ch = value;
Py_UCS4 * to = (Py_UCS4 *)data + start;
const Py_UCS4 *end = to + length;
for (; to < end; ++to) *to = ch;
break;
}
default: Py_UNREACHABLE();
}
}
/* Fast detection of the most frequent whitespace characters */
const unsigned char _Py_ascii_whitespace[] = {
0, 0, 0, 0, 0, 0, 0, 0,
/* case 0x0009: * CHARACTER TABULATION */
/* case 0x000A: * LINE FEED */
/* case 0x000B: * LINE TABULATION */
/* case 0x000C: * FORM FEED */
/* case 0x000D: * CARRIAGE RETURN */
0, 1, 1, 1, 1, 1, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
/* case 0x001C: * FILE SEPARATOR */
/* case 0x001D: * GROUP SEPARATOR */
/* case 0x001E: * RECORD SEPARATOR */
/* case 0x001F: * UNIT SEPARATOR */
0, 0, 0, 0, 1, 1, 1, 1,
/* case 0x0020: * SPACE */
1, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0
};
/* forward */
static PyObject* get_latin1_char(unsigned char ch);
static int unicode_modifiable(PyObject *unicode);
static PyObject *
_PyUnicode_FromUCS1(const Py_UCS1 *s, Py_ssize_t size);
static PyObject *
_PyUnicode_FromUCS2(const Py_UCS2 *s, Py_ssize_t size);
static PyObject *
_PyUnicode_FromUCS4(const Py_UCS4 *s, Py_ssize_t size);
static PyObject *
unicode_encode_call_errorhandler(const char *errors,
PyObject **errorHandler,const char *encoding, const char *reason,
PyObject *unicode, PyObject **exceptionObject,
Py_ssize_t startpos, Py_ssize_t endpos, Py_ssize_t *newpos);
static void
raise_encode_exception(PyObject **exceptionObject,
const char *encoding,
PyObject *unicode,
Py_ssize_t startpos, Py_ssize_t endpos,
const char *reason);
/* Same for linebreaks */
static const unsigned char ascii_linebreak[] = {
0, 0, 0, 0, 0, 0, 0, 0,
/* 0x000A, * LINE FEED */
/* 0x000B, * LINE TABULATION */
/* 0x000C, * FORM FEED */
/* 0x000D, * CARRIAGE RETURN */
0, 0, 1, 1, 1, 1, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
/* 0x001C, * FILE SEPARATOR */
/* 0x001D, * GROUP SEPARATOR */
/* 0x001E, * RECORD SEPARATOR */
0, 0, 0, 0, 1, 1, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0
};
static int convert_uc(PyObject *obj, void *addr);
struct encoding_map;
#include "clinic/unicodeobject.c.h"
_Py_error_handler
_Py_GetErrorHandler(const char *errors)
{
if (errors == NULL || strcmp(errors, "strict") == 0) {
return _Py_ERROR_STRICT;
}
if (strcmp(errors, "surrogateescape") == 0) {
return _Py_ERROR_SURROGATEESCAPE;
}
if (strcmp(errors, "replace") == 0) {
return _Py_ERROR_REPLACE;
}
if (strcmp(errors, "ignore") == 0) {
return _Py_ERROR_IGNORE;
}
if (strcmp(errors, "backslashreplace") == 0) {
return _Py_ERROR_BACKSLASHREPLACE;
}
if (strcmp(errors, "surrogatepass") == 0) {
return _Py_ERROR_SURROGATEPASS;
}
if (strcmp(errors, "xmlcharrefreplace") == 0) {
return _Py_ERROR_XMLCHARREFREPLACE;
}
return _Py_ERROR_OTHER;
}
static _Py_error_handler
get_error_handler_wide(const wchar_t *errors)
{
if (errors == NULL || wcscmp(errors, L"strict") == 0) {
return _Py_ERROR_STRICT;
}
if (wcscmp(errors, L"surrogateescape") == 0) {
return _Py_ERROR_SURROGATEESCAPE;
}
if (wcscmp(errors, L"replace") == 0) {
return _Py_ERROR_REPLACE;
}
if (wcscmp(errors, L"ignore") == 0) {
return _Py_ERROR_IGNORE;
}
if (wcscmp(errors, L"backslashreplace") == 0) {
return _Py_ERROR_BACKSLASHREPLACE;
}
if (wcscmp(errors, L"surrogatepass") == 0) {
return _Py_ERROR_SURROGATEPASS;
}
if (wcscmp(errors, L"xmlcharrefreplace") == 0) {
return _Py_ERROR_XMLCHARREFREPLACE;
}
return _Py_ERROR_OTHER;
}
static inline int
unicode_check_encoding_errors(const char *encoding, const char *errors)
{
if (encoding == NULL && errors == NULL) {
return 0;
}
PyInterpreterState *interp = _PyInterpreterState_GET();
#ifndef Py_DEBUG
/* In release mode, only check in development mode (-X dev) */
if (!_PyInterpreterState_GetConfig(interp)->dev_mode) {
return 0;
}
#else
/* Always check in debug mode */
#endif
/* Avoid calling _PyCodec_Lookup() and PyCodec_LookupError() before the
codec registry is ready: before_PyUnicode_InitEncodings() is called. */
if (!interp->unicode.fs_codec.encoding) {
return 0;
}
/* Disable checks during Python finalization. For example, it allows to
call _PyObject_Dump() during finalization for debugging purpose. */
if (interp->finalizing) {
return 0;
}
if (encoding != NULL
// Fast path for the most common built-in encodings. Even if the codec
// is cached, _PyCodec_Lookup() decodes the bytes string from UTF-8 to
// create a temporary Unicode string (the key in the cache).
&& strcmp(encoding, "utf-8") != 0
&& strcmp(encoding, "utf8") != 0
&& strcmp(encoding, "ascii") != 0)
{
PyObject *handler = _PyCodec_Lookup(encoding);
if (handler == NULL) {
return -1;
}
Py_DECREF(handler);
}
if (errors != NULL
// Fast path for the most common built-in error handlers.
&& strcmp(errors, "strict") != 0
&& strcmp(errors, "ignore") != 0
&& strcmp(errors, "replace") != 0
&& strcmp(errors, "surrogateescape") != 0
&& strcmp(errors, "surrogatepass") != 0)
{
PyObject *handler = PyCodec_LookupError(errors);
if (handler == NULL) {
return -1;
}
Py_DECREF(handler);
}
return 0;
}
int
_PyUnicode_CheckConsistency(PyObject *op, int check_content)
{
#define CHECK(expr) \
do { if (!(expr)) { _PyObject_ASSERT_FAILED_MSG(op, Py_STRINGIFY(expr)); } } while (0)
assert(op != NULL);
CHECK(PyUnicode_Check(op));
PyASCIIObject *ascii = _PyASCIIObject_CAST(op);
int kind = ascii->state.kind;
if (ascii->state.ascii == 1 && ascii->state.compact == 1) {
CHECK(kind == PyUnicode_1BYTE_KIND);
}
else {
PyCompactUnicodeObject *compact = _PyCompactUnicodeObject_CAST(op);
void *data;
if (ascii->state.compact == 1) {
data = compact + 1;
CHECK(kind == PyUnicode_1BYTE_KIND
|| kind == PyUnicode_2BYTE_KIND
|| kind == PyUnicode_4BYTE_KIND);
CHECK(ascii->state.ascii == 0);
CHECK(compact->utf8 != data);
}
else {
PyUnicodeObject *unicode = _PyUnicodeObject_CAST(op);
data = unicode->data.any;
CHECK(kind == PyUnicode_1BYTE_KIND
|| kind == PyUnicode_2BYTE_KIND
|| kind == PyUnicode_4BYTE_KIND);
CHECK(ascii->state.compact == 0);
CHECK(data != NULL);
if (ascii->state.ascii) {
CHECK(compact->utf8 == data);
CHECK(compact->utf8_length == ascii->length);
}
else {
CHECK(compact->utf8 != data);
}
}
if (compact->utf8 == NULL)
CHECK(compact->utf8_length == 0);
}
/* check that the best kind is used: O(n) operation */
if (check_content) {
Py_ssize_t i;
Py_UCS4 maxchar = 0;
const void *data;
Py_UCS4 ch;
data = PyUnicode_DATA(ascii);
for (i=0; i < ascii->length; i++)
{
ch = PyUnicode_READ(kind, data, i);
if (ch > maxchar)
maxchar = ch;
}
if (kind == PyUnicode_1BYTE_KIND) {
if (ascii->state.ascii == 0) {
CHECK(maxchar >= 128);
CHECK(maxchar <= 255);
}
else
CHECK(maxchar < 128);
}
else if (kind == PyUnicode_2BYTE_KIND) {
CHECK(maxchar >= 0x100);
CHECK(maxchar <= 0xFFFF);
}
else {
CHECK(maxchar >= 0x10000);
CHECK(maxchar <= MAX_UNICODE);
}
CHECK(PyUnicode_READ(kind, data, ascii->length) == 0);
}
return 1;
#undef CHECK
}
static PyObject*
unicode_result(PyObject *unicode)
{
assert(_PyUnicode_CHECK(unicode));
Py_ssize_t length = PyUnicode_GET_LENGTH(unicode);
if (length == 0) {
PyObject *empty = unicode_get_empty();
if (unicode != empty) {
Py_DECREF(unicode);
}
return empty;
}
if (length == 1) {
int kind = PyUnicode_KIND(unicode);
if (kind == PyUnicode_1BYTE_KIND) {
const Py_UCS1 *data = PyUnicode_1BYTE_DATA(unicode);
Py_UCS1 ch = data[0];
PyObject *latin1_char = LATIN1(ch);
if (unicode != latin1_char) {
Py_DECREF(unicode);
}
return latin1_char;
}
}
assert(_PyUnicode_CheckConsistency(unicode, 1));
return unicode;
}
static PyObject*
unicode_result_unchanged(PyObject *unicode)
{
if (PyUnicode_CheckExact(unicode)) {
return Py_NewRef(unicode);
}
else
/* Subtype -- return genuine unicode string with the same value. */
return _PyUnicode_Copy(unicode);
}
/* Implementation of the "backslashreplace" error handler for 8-bit encodings:
ASCII, Latin1, UTF-8, etc. */
static char*
backslashreplace(_PyBytesWriter *writer, char *str,
PyObject *unicode, Py_ssize_t collstart, Py_ssize_t collend)
{
Py_ssize_t size, i;
Py_UCS4 ch;
int kind;
const void *data;
kind = PyUnicode_KIND(unicode);
data = PyUnicode_DATA(unicode);
size = 0;
/* determine replacement size */
for (i = collstart; i < collend; ++i) {
Py_ssize_t incr;
ch = PyUnicode_READ(kind, data, i);
if (ch < 0x100)
incr = 2+2;
else if (ch < 0x10000)
incr = 2+4;
else {
assert(ch <= MAX_UNICODE);
incr = 2+8;
}
if (size > PY_SSIZE_T_MAX - incr) {
PyErr_SetString(PyExc_OverflowError,
"encoded result is too long for a Python string");
return NULL;
}
size += incr;
}
str = _PyBytesWriter_Prepare(writer, str, size);
if (str == NULL)
return NULL;
/* generate replacement */
for (i = collstart; i < collend; ++i) {
ch = PyUnicode_READ(kind, data, i);
*str++ = '\\';
if (ch >= 0x00010000) {
*str++ = 'U';
*str++ = Py_hexdigits[(ch>>28)&0xf];
*str++ = Py_hexdigits[(ch>>24)&0xf];
*str++ = Py_hexdigits[(ch>>20)&0xf];
*str++ = Py_hexdigits[(ch>>16)&0xf];
*str++ = Py_hexdigits[(ch>>12)&0xf];
*str++ = Py_hexdigits[(ch>>8)&0xf];
}
else if (ch >= 0x100) {
*str++ = 'u';
*str++ = Py_hexdigits[(ch>>12)&0xf];
*str++ = Py_hexdigits[(ch>>8)&0xf];
}
else
*str++ = 'x';
*str++ = Py_hexdigits[(ch>>4)&0xf];
*str++ = Py_hexdigits[ch&0xf];
}
return str;
}
/* Implementation of the "xmlcharrefreplace" error handler for 8-bit encodings:
ASCII, Latin1, UTF-8, etc. */
static char*
xmlcharrefreplace(_PyBytesWriter *writer, char *str,
PyObject *unicode, Py_ssize_t collstart, Py_ssize_t collend)
{
Py_ssize_t size, i;
Py_UCS4 ch;
int kind;
const void *data;
kind = PyUnicode_KIND(unicode);
data = PyUnicode_DATA(unicode);
size = 0;
/* determine replacement size */
for (i = collstart; i < collend; ++i) {
Py_ssize_t incr;
ch = PyUnicode_READ(kind, data, i);
if (ch < 10)
incr = 2+1+1;
else if (ch < 100)
incr = 2+2+1;
else if (ch < 1000)
incr = 2+3+1;
else if (ch < 10000)
incr = 2+4+1;
else if (ch < 100000)
incr = 2+5+1;
else if (ch < 1000000)
incr = 2+6+1;
else {
assert(ch <= MAX_UNICODE);
incr = 2+7+1;
}
if (size > PY_SSIZE_T_MAX - incr) {
PyErr_SetString(PyExc_OverflowError,
"encoded result is too long for a Python string");
return NULL;
}
size += incr;
}
str = _PyBytesWriter_Prepare(writer, str, size);
if (str == NULL)
return NULL;
/* generate replacement */
for (i = collstart; i < collend; ++i) {
size = sprintf(str, "&#%d;", PyUnicode_READ(kind, data, i));
if (size < 0) {
return NULL;
}
str += size;
}
return str;
}
/* --- Bloom Filters ----------------------------------------------------- */
/* stuff to implement simple "bloom filters" for Unicode characters.
to keep things simple, we use a single bitmask, using the least 5
bits from each unicode characters as the bit index. */
/* the linebreak mask is set up by _PyUnicode_Init() below */
#if LONG_BIT >= 128
#define BLOOM_WIDTH 128
#elif LONG_BIT >= 64
#define BLOOM_WIDTH 64
#elif LONG_BIT >= 32
#define BLOOM_WIDTH 32
#else
#error "LONG_BIT is smaller than 32"
#endif
#define BLOOM_MASK unsigned long
static BLOOM_MASK bloom_linebreak = ~(BLOOM_MASK)0;
#define BLOOM(mask, ch) ((mask & (1UL << ((ch) & (BLOOM_WIDTH - 1)))))
#define BLOOM_LINEBREAK(ch) \
((ch) < 128U ? ascii_linebreak[(ch)] : \
(BLOOM(bloom_linebreak, (ch)) && Py_UNICODE_ISLINEBREAK(ch)))
static inline BLOOM_MASK
make_bloom_mask(int kind, const void* ptr, Py_ssize_t len)
{
#define BLOOM_UPDATE(TYPE, MASK, PTR, LEN) \
do { \
TYPE *data = (TYPE *)PTR; \
TYPE *end = data + LEN; \
Py_UCS4 ch; \
for (; data != end; data++) { \
ch = *data; \
MASK |= (1UL << (ch & (BLOOM_WIDTH - 1))); \
} \
break; \
} while (0)
/* calculate simple bloom-style bitmask for a given unicode string */
BLOOM_MASK mask;
mask = 0;
switch (kind) {
case PyUnicode_1BYTE_KIND:
BLOOM_UPDATE(Py_UCS1, mask, ptr, len);
break;
case PyUnicode_2BYTE_KIND:
BLOOM_UPDATE(Py_UCS2, mask, ptr, len);
break;
case PyUnicode_4BYTE_KIND:
BLOOM_UPDATE(Py_UCS4, mask, ptr, len);
break;
default:
Py_UNREACHABLE();
}
return mask;
#undef BLOOM_UPDATE
}
static int
ensure_unicode(PyObject *obj)
{
if (!PyUnicode_Check(obj)) {
PyErr_Format(PyExc_TypeError,
"must be str, not %.100s",
Py_TYPE(obj)->tp_name);
return -1;
}
return 0;
}
/* Compilation of templated routines */
#define STRINGLIB_GET_EMPTY() unicode_get_empty()
#include "stringlib/asciilib.h"
#include "stringlib/fastsearch.h"
#include "stringlib/partition.h"
#include "stringlib/split.h"
#include "stringlib/count.h"
#include "stringlib/find.h"
#include "stringlib/find_max_char.h"
#include "stringlib/undef.h"
#include "stringlib/ucs1lib.h"
#include "stringlib/fastsearch.h"
#include "stringlib/partition.h"
#include "stringlib/split.h"
#include "stringlib/count.h"
#include "stringlib/find.h"
#include "stringlib/replace.h"
#include "stringlib/find_max_char.h"
#include "stringlib/undef.h"
#include "stringlib/ucs2lib.h"
#include "stringlib/fastsearch.h"
#include "stringlib/partition.h"
#include "stringlib/split.h"
#include "stringlib/count.h"
#include "stringlib/find.h"
#include "stringlib/replace.h"
#include "stringlib/find_max_char.h"
#include "stringlib/undef.h"
#include "stringlib/ucs4lib.h"
#include "stringlib/fastsearch.h"
#include "stringlib/partition.h"
#include "stringlib/split.h"
#include "stringlib/count.h"
#include "stringlib/find.h"
#include "stringlib/replace.h"
#include "stringlib/find_max_char.h"
#include "stringlib/undef.h"
#undef STRINGLIB_GET_EMPTY
/* --- Unicode Object ----------------------------------------------------- */
static inline Py_ssize_t
findchar(const void *s, int kind,
Py_ssize_t size, Py_UCS4 ch,
int direction)
{
switch (kind) {
case PyUnicode_1BYTE_KIND:
if ((Py_UCS1) ch != ch)
return -1;
if (direction > 0)
return ucs1lib_find_char((const Py_UCS1 *) s, size, (Py_UCS1) ch);
else
return ucs1lib_rfind_char((const Py_UCS1 *) s, size, (Py_UCS1) ch);
case PyUnicode_2BYTE_KIND:
if ((Py_UCS2) ch != ch)
return -1;
if (direction > 0)
return ucs2lib_find_char((const Py_UCS2 *) s, size, (Py_UCS2) ch);
else
return ucs2lib_rfind_char((const Py_UCS2 *) s, size, (Py_UCS2) ch);
case PyUnicode_4BYTE_KIND:
if (direction > 0)
return ucs4lib_find_char((const Py_UCS4 *) s, size, ch);
else
return ucs4lib_rfind_char((const Py_UCS4 *) s, size, ch);
default:
Py_UNREACHABLE();
}
}
#ifdef Py_DEBUG
/* Fill the data of a Unicode string with invalid characters to detect bugs
earlier.
_PyUnicode_CheckConsistency(str, 1) detects invalid characters, at least for
ASCII and UCS-4 strings. U+00FF is invalid in ASCII and U+FFFFFFFF is an
invalid character in Unicode 6.0. */
static void
unicode_fill_invalid(PyObject *unicode, Py_ssize_t old_length)
{
int kind = PyUnicode_KIND(unicode);
Py_UCS1 *data = PyUnicode_1BYTE_DATA(unicode);
Py_ssize_t length = _PyUnicode_LENGTH(unicode);
if (length <= old_length)
return;
memset(data + old_length * kind, 0xff, (length - old_length) * kind);
}
#endif
static PyObject*
resize_compact(PyObject *unicode, Py_ssize_t length)
{
Py_ssize_t char_size;
Py_ssize_t struct_size;
Py_ssize_t new_size;
PyObject *new_unicode;
#ifdef Py_DEBUG
Py_ssize_t old_length = _PyUnicode_LENGTH(unicode);
#endif
assert(unicode_modifiable(unicode));
assert(PyUnicode_IS_COMPACT(unicode));
char_size = PyUnicode_KIND(unicode);
if (PyUnicode_IS_ASCII(unicode))
struct_size = sizeof(PyASCIIObject);
else
struct_size = sizeof(PyCompactUnicodeObject);
if (length > ((PY_SSIZE_T_MAX - struct_size) / char_size - 1)) {
PyErr_NoMemory();
return NULL;
}
new_size = (struct_size + (length + 1) * char_size);
if (_PyUnicode_HAS_UTF8_MEMORY(unicode)) {
PyObject_Free(_PyUnicode_UTF8(unicode));
_PyUnicode_UTF8(unicode) = NULL;