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bpo-45467: Fix IncrementalDecoder and StreamReader in the "raw-unicode-escape" codec (GH-28944)

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They support now splitting escape sequences between input chunks.

Add the third parameter "final" in codecs.raw_unicode_escape_decode().
It is True by default to match the former behavior.
This commit is contained in:
Serhiy Storchaka 2021-10-14 20:04:19 +03:00 committed by GitHub
parent d413c50363
commit 39aa98346d
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 116 additions and 35 deletions
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10
Include/cpython/unicodeobject.h
View file

@ -796,6 +796,16 @@ PyAPI_FUNC(PyObject*) _PyUnicode_DecodeUnicodeEscapeInternal(
string. */
);
/* --- Raw-Unicode-Escape Codecs ---------------------------------------------- */
/* Variant of PyUnicode_DecodeRawUnicodeEscape that supports partial decoding. */
PyAPI_FUNC(PyObject*) _PyUnicode_DecodeRawUnicodeEscapeStateful(
const char *string, /* Unicode-Escape encoded string */
Py_ssize_t length, /* size of string */
const char *errors, /* error handling */
Py_ssize_t *consumed /* bytes consumed */
);
/* --- Latin-1 Codecs ----------------------------------------------------- */
PyAPI_FUNC(PyObject*) _PyUnicode_AsLatin1String(

9
Lib/encodings/raw_unicode_escape.py
View file

@ -21,15 +21,16 @@ class IncrementalEncoder(codecs.IncrementalEncoder):
def encode(self, input, final=False):
return codecs.raw_unicode_escape_encode(input, self.errors)[0]
class IncrementalDecoder(codecs.IncrementalDecoder):
def decode(self, input, final=False):
return codecs.raw_unicode_escape_decode(input, self.errors)[0]
class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
def _buffer_decode(self, input, errors, final):
return codecs.raw_unicode_escape_decode(input, errors, final)
class StreamWriter(Codec,codecs.StreamWriter):
pass
class StreamReader(Codec,codecs.StreamReader):
pass
def decode(self, input, errors='strict'):
return codecs.raw_unicode_escape_decode(input, errors, False)
### encodings module API

35
Lib/test/test_codecs.py
View file

@ -2483,7 +2483,11 @@ def test_partial(self):
]
)
class RawUnicodeEscapeTest(unittest.TestCase):
class RawUnicodeEscapeTest(ReadTest, unittest.TestCase):
encoding = "raw-unicode-escape"
test_lone_surrogates = None
def test_empty(self):
self.assertEqual(codecs.raw_unicode_escape_encode(""), (b"", 0))
self.assertEqual(codecs.raw_unicode_escape_decode(b""), ("", 0))
@ -2532,6 +2536,35 @@ def test_decode_errors(self):
self.assertEqual(decode(br"\U00110000", "ignore"), ("", 10))
self.assertEqual(decode(br"\U00110000", "replace"), ("\ufffd", 10))
def test_partial(self):
self.check_partial(
"\x00\t\n\r\\\xff\uffff\U00010000",
[
'\x00',
'\x00\t',
'\x00\t\n',
'\x00\t\n\r',
'\x00\t\n\r',
'\x00\t\n\r\\\xff',
'\x00\t\n\r\\\xff',
'\x00\t\n\r\\\xff',
'\x00\t\n\r\\\xff',
'\x00\t\n\r\\\xff',
'\x00\t\n\r\\\xff',
'\x00\t\n\r\\\xff\uffff',
'\x00\t\n\r\\\xff\uffff',
'\x00\t\n\r\\\xff\uffff',
'\x00\t\n\r\\\xff\uffff',
'\x00\t\n\r\\\xff\uffff',
'\x00\t\n\r\\\xff\uffff',
'\x00\t\n\r\\\xff\uffff',
'\x00\t\n\r\\\xff\uffff',
'\x00\t\n\r\\\xff\uffff',
'\x00\t\n\r\\\xff\uffff',
'\x00\t\n\r\\\xff\uffff\U00010000',
]
)
class EscapeEncodeTest(unittest.TestCase):

2
Misc/NEWS.d/next/Library/2021-10-14-13-31-19.bpo-45467.Q7Ma6A.rst Normal file
View file

@ -0,0 +1,2 @@
Fix incremental decoder and stream reader in the "raw-unicode-escape" codec.
Previously they failed if the escape sequence was split.

13
Modules/_codecsmodule.c
View file

@ -509,17 +509,20 @@ _codecs_unicode_escape_decode_impl(PyObject *module, Py_buffer *data,
_codecs.raw_unicode_escape_decode
data: Py_buffer(accept={str, buffer})
errors: str(accept={str, NoneType}) = None
final: bool(accept={int}) = True
/
[clinic start generated code]*/
static PyObject *
_codecs_raw_unicode_escape_decode_impl(PyObject *module, Py_buffer *data,
const char *errors)
/*[clinic end generated code: output=c98eeb56028070a6 input=d2f5159ce3b3392f]*/
const char *errors, int final)
/*[clinic end generated code: output=11dbd96301e2879e input=2d166191beb3235a]*/
{
PyObject *decoded = PyUnicode_DecodeRawUnicodeEscape(data->buf, data->len,
errors);
return codec_tuple(decoded, data->len);
Py_ssize_t consumed = data->len;
PyObject *decoded = _PyUnicode_DecodeRawUnicodeEscapeStateful(data->buf, data->len,
errors,
final ? NULL : &consumed);
return codec_tuple(decoded, consumed);
}
/*[clinic input]

18
Modules/clinic/_codecsmodule.c.h generated
View file

@ -1143,7 +1143,7 @@ exit:
}
PyDoc_STRVAR(_codecs_raw_unicode_escape_decode__doc__,
"raw_unicode_escape_decode($module, data, errors=None, /)\n"
"raw_unicode_escape_decode($module, data, errors=None, final=True, /)\n"
"--\n"
"\n");
@ -1152,7 +1152,7 @@ PyDoc_STRVAR(_codecs_raw_unicode_escape_decode__doc__,
static PyObject *
_codecs_raw_unicode_escape_decode_impl(PyObject *module, Py_buffer *data,
const char *errors);
const char *errors, int final);
static PyObject *
_codecs_raw_unicode_escape_decode(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
@ -1160,8 +1160,9 @@ _codecs_raw_unicode_escape_decode(PyObject *module, PyObject *const *args, Py_ss
PyObject *return_value = NULL;
Py_buffer data = {NULL, NULL};
const char *errors = NULL;
int final = 1;
if (!_PyArg_CheckPositional("raw_unicode_escape_decode", nargs, 1, 2)) {
if (!_PyArg_CheckPositional("raw_unicode_escape_decode", nargs, 1, 3)) {
goto exit;
}
if (PyUnicode_Check(args[0])) {
@ -1202,8 +1203,15 @@ _codecs_raw_unicode_escape_decode(PyObject *module, PyObject *const *args, Py_ss
_PyArg_BadArgument("raw_unicode_escape_decode", "argument 2", "str or None", args[1]);
goto exit;
}
if (nargs < 3) {
goto skip_optional;
}
final = _PyLong_AsInt(args[2]);
if (final == -1 && PyErr_Occurred()) {
goto exit;
}
skip_optional:
return_value = _codecs_raw_unicode_escape_decode_impl(module, &data, errors);
return_value = _codecs_raw_unicode_escape_decode_impl(module, &data, errors, final);
exit:
/* Cleanup for data */
@ -2809,4 +2817,4 @@ exit:
#ifndef _CODECS_CODE_PAGE_ENCODE_METHODDEF
#define _CODECS_CODE_PAGE_ENCODE_METHODDEF
#endif /* !defined(_CODECS_CODE_PAGE_ENCODE_METHODDEF) */
/*[clinic end generated code: output=9e9fb1d5d81577e0 input=a9049054013a1b77]*/
/*[clinic end generated code: output=814dae36b6f885cb input=a9049054013a1b77]*/

64
Objects/unicodeobject.c
View file

@ -6379,8 +6379,6 @@ _PyUnicode_DecodeUnicodeEscapeInternal(const char *s,
unsigned char c = (unsigned char) *s++;
Py_UCS4 ch;
int count;
Py_ssize_t startinpos;
Py_ssize_t endinpos;
const char *message;
#define WRITE_ASCII_CHAR(ch) \
@ -6407,7 +6405,7 @@ _PyUnicode_DecodeUnicodeEscapeInternal(const char *s,
continue;
}
startinpos = s - starts - 1;
Py_ssize_t startinpos = s - starts - 1;
/* \ - Escapes */
if (s >= end) {
message = "\\ at end of string";
@ -6554,8 +6552,8 @@ _PyUnicode_DecodeUnicodeEscapeInternal(const char *s,
*consumed = startinpos;
break;
}
error:
endinpos = s-starts;
error:;
Py_ssize_t endinpos = s-starts;
writer.min_length = end - s + writer.pos;
if (unicode_decode_call_errorhandler_writer(
errors, &errorHandler,
@ -6735,9 +6733,10 @@ PyUnicode_AsUnicodeEscapeString(PyObject *unicode)
/* --- Raw Unicode Escape Codec ------------------------------------------- */
PyObject *
PyUnicode_DecodeRawUnicodeEscape(const char *s,
Py_ssize_t size,
const char *errors)
_PyUnicode_DecodeRawUnicodeEscapeStateful(const char *s,
Py_ssize_t size,
const char *errors,
Py_ssize_t *consumed)
{
const char *starts = s;
_PyUnicodeWriter writer;
@ -6746,6 +6745,9 @@ PyUnicode_DecodeRawUnicodeEscape(const char *s,
PyObject *exc = NULL;
if (size == 0) {
if (consumed) {
*consumed = 0;
}
_Py_RETURN_UNICODE_EMPTY();
}
@ -6764,8 +6766,6 @@ PyUnicode_DecodeRawUnicodeEscape(const char *s,
unsigned char c = (unsigned char) *s++;
Py_UCS4 ch;
int count;
Py_ssize_t startinpos;
Py_ssize_t endinpos;
const char *message;
#define WRITE_CHAR(ch) \
@ -6780,11 +6780,21 @@ PyUnicode_DecodeRawUnicodeEscape(const char *s,
} while(0)
/* Non-escape characters are interpreted as Unicode ordinals */
if (c != '\\' || s >= end) {
if (c != '\\' || (s >= end && !consumed)) {
WRITE_CHAR(c);
continue;
}
Py_ssize_t startinpos = s - starts - 1;
/* \ - Escapes */
if (s >= end) {
assert(consumed);
// Set message to silent compiler warning.
// Actually it is never used.
message = "\\ at end of string";
goto incomplete;
}
c = (unsigned char) *s++;
if (c == 'u') {
count = 4;
@ -6800,10 +6810,12 @@ PyUnicode_DecodeRawUnicodeEscape(const char *s,
WRITE_CHAR(c);
continue;
}
startinpos = s - starts - 2;
/* \uHHHH with 4 hex digits, \U00HHHHHH with 8 */
for (ch = 0; count && s < end; ++s, --count) {
for (ch = 0; count; ++s, --count) {
if (s >= end) {
goto incomplete;
}
c = (unsigned char)*s;
ch <<= 4;
if (c >= '0' && c <= '9') {
@ -6816,18 +6828,23 @@ PyUnicode_DecodeRawUnicodeEscape(const char *s,
ch += c - ('A' - 10);
}
else {
break;
goto error;
}
}
if (!count) {
if (ch <= MAX_UNICODE) {
WRITE_CHAR(ch);
continue;
}
if (ch > MAX_UNICODE) {
message = "\\Uxxxxxxxx out of range";
goto error;
}
WRITE_CHAR(ch);
continue;
endinpos = s-starts;
incomplete:
if (consumed) {
*consumed = startinpos;
break;
}
error:;
Py_ssize_t endinpos = s-starts;
writer.min_length = end - s + writer.pos;
if (unicode_decode_call_errorhandler_writer(
errors, &errorHandler,
@ -6849,7 +6866,14 @@ PyUnicode_DecodeRawUnicodeEscape(const char *s,
Py_XDECREF(errorHandler);
Py_XDECREF(exc);
return NULL;
}
PyObject *
PyUnicode_DecodeRawUnicodeEscape(const char *s,
Py_ssize_t size,
const char *errors)
{
return _PyUnicode_DecodeRawUnicodeEscapeStateful(s, size, errors, NULL);
}