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#include "Python.h"
#if PY_VERSION_HEX < 0x02050000 && !defined(PY_SSIZE_T_MIN)
typedef int Py_ssize_t;
#define PY_SSIZE_T_MAX INT_MAX
#define PY_SSIZE_T_MIN INT_MIN
#endif
static Py_ssize_t
ascii_escape_char(Py_UNICODE c, char *output, Py_ssize_t chars);
static PyObject *
ascii_escape_unicode(PyObject *pystr);
static PyObject *
ascii_escape_str(PyObject *pystr);
static PyObject *
py_encode_basestring_ascii(PyObject* self __attribute__((__unused__)), PyObject *pystr);
void init_speedups(void);
#define S_CHAR(c) (c >= ' ' && c <= '~' && c != '\\' && c != '/' && c != '"')
#define MIN_EXPANSION 6
#ifdef Py_UNICODE_WIDE
#define MAX_EXPANSION (2 * MIN_EXPANSION)
#else
#define MAX_EXPANSION MIN_EXPANSION
#endif
static Py_ssize_t
ascii_escape_char(Py_UNICODE c, char *output, Py_ssize_t chars) {
Py_UNICODE x;
output[chars++] = '\\';
switch (c) {
case '/': output[chars++] = (char)c; break;
case '\\': output[chars++] = (char)c; break;
case '"': output[chars++] = (char)c; break;
case '\b': output[chars++] = 'b'; break;
case '\f': output[chars++] = 'f'; break;
case '\n': output[chars++] = 'n'; break;
case '\r': output[chars++] = 'r'; break;
case '\t': output[chars++] = 't'; break;
default:
#ifdef Py_UNICODE_WIDE
if (c >= 0x10000) {
/* UTF-16 surrogate pair */
Py_UNICODE v = c - 0x10000;
c = 0xd800 | ((v >> 10) & 0x3ff);
output[chars++] = 'u';
x = (c & 0xf000) >> 12;
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
x = (c & 0x0f00) >> 8;
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
x = (c & 0x00f0) >> 4;
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
x = (c & 0x000f);
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
c = 0xdc00 | (v & 0x3ff);
output[chars++] = '\\';
}
#endif
output[chars++] = 'u';
x = (c & 0xf000) >> 12;
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
x = (c & 0x0f00) >> 8;
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
x = (c & 0x00f0) >> 4;
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
x = (c & 0x000f);
output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
}
return chars;
}
static PyObject *
ascii_escape_unicode(PyObject *pystr) {
Py_ssize_t i;
Py_ssize_t input_chars;
Py_ssize_t output_size;
Py_ssize_t chars;
PyObject *rval;
char *output;
Py_UNICODE *input_unicode;
input_chars = PyUnicode_GET_SIZE(pystr);
input_unicode = PyUnicode_AS_UNICODE(pystr);
/* One char input can be up to 6 chars output, estimate 4 of these */
output_size = 2 + (MIN_EXPANSION * 4) + input_chars;
rval = PyString_FromStringAndSize(NULL, output_size);
if (rval == NULL) {
return NULL;
}
output = PyString_AS_STRING(rval);
chars = 0;
output[chars++] = '"';
for (i = 0; i < input_chars; i++) {
Py_UNICODE c = input_unicode[i];
if (S_CHAR(c)) {
output[chars++] = (char)c;
} else {
chars = ascii_escape_char(c, output, chars);
}
if (output_size - chars < (1 + MAX_EXPANSION)) {
/* There's more than four, so let's resize by a lot */
output_size *= 2;
/* This is an upper bound */
if (output_size > 2 + (input_chars * MAX_EXPANSION)) {
output_size = 2 + (input_chars * MAX_EXPANSION);
}
if (_PyString_Resize(&rval, output_size) == -1) {
return NULL;
}
output = PyString_AS_STRING(rval);
}
}
output[chars++] = '"';
if (_PyString_Resize(&rval, chars) == -1) {
return NULL;
}
return rval;
}
static PyObject *
ascii_escape_str(PyObject *pystr) {
Py_ssize_t i;
Py_ssize_t input_chars;
Py_ssize_t output_size;
Py_ssize_t chars;
PyObject *rval;
char *output;
char *input_str;
input_chars = PyString_GET_SIZE(pystr);
input_str = PyString_AS_STRING(pystr);
/* One char input can be up to 6 chars output, estimate 4 of these */
output_size = 2 + (MIN_EXPANSION * 4) + input_chars;
rval = PyString_FromStringAndSize(NULL, output_size);
if (rval == NULL) {
return NULL;
}
output = PyString_AS_STRING(rval);
chars = 0;
output[chars++] = '"';
for (i = 0; i < input_chars; i++) {
Py_UNICODE c = (Py_UNICODE)input_str[i];
if (S_CHAR(c)) {
output[chars++] = (char)c;
} else if (c > 0x7F) {
/* We hit a non-ASCII character, bail to unicode mode */
PyObject *uni;
Py_DECREF(rval);
uni = PyUnicode_DecodeUTF8(input_str, input_chars, "strict");
if (uni == NULL) {
return NULL;
}
rval = ascii_escape_unicode(uni);
Py_DECREF(uni);
return rval;
} else {
chars = ascii_escape_char(c, output, chars);
}
/* An ASCII char can't possibly expand to a surrogate! */
if (output_size - chars < (1 + MIN_EXPANSION)) {
/* There's more than four, so let's resize by a lot */
output_size *= 2;
if (output_size > 2 + (input_chars * MIN_EXPANSION)) {
output_size = 2 + (input_chars * MIN_EXPANSION);
}
if (_PyString_Resize(&rval, output_size) == -1) {
return NULL;
}
output = PyString_AS_STRING(rval);
}
}
output[chars++] = '"';
if (_PyString_Resize(&rval, chars) == -1) {
return NULL;
}
return rval;
}
PyDoc_STRVAR(pydoc_encode_basestring_ascii,
"encode_basestring_ascii(basestring) -> str\n"
"\n"
"..."
);
static PyObject *
py_encode_basestring_ascii(PyObject* self __attribute__((__unused__)), PyObject *pystr) {
/* METH_O */
if (PyString_Check(pystr)) {
return ascii_escape_str(pystr);
} else if (PyUnicode_Check(pystr)) {
return ascii_escape_unicode(pystr);
}
PyErr_SetString(PyExc_TypeError, "first argument must be a string");
return NULL;
}
#define DEFN(n, k) \
{ \
#n, \
(PyCFunction)py_ ##n, \
k, \
pydoc_ ##n \
}
static PyMethodDef speedups_methods[] = {
DEFN(encode_basestring_ascii, METH_O),
{}
};
#undef DEFN
void
init_speedups(void)
{
PyObject *m;
m = Py_InitModule4("_speedups", speedups_methods, NULL, NULL, PYTHON_API_VERSION);
}
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