Mini Shell
/**
* markupsafe._speedups
* ~~~~~~~~~~~~~~~~~~~~
*
* C implementation of escaping for better performance. Used instead of
* the native Python implementation when compiled.
*
* :copyright: 2010 Pallets
* :license: BSD-3-Clause
*/
#include <Python.h>
#if PY_MAJOR_VERSION < 3
#define ESCAPED_CHARS_TABLE_SIZE 63
#define UNICHR(x) (PyUnicode_AS_UNICODE((PyUnicodeObject*)PyUnicode_DecodeASCII(x, strlen(x), NULL)));
static Py_ssize_t escaped_chars_delta_len[ESCAPED_CHARS_TABLE_SIZE];
static Py_UNICODE *escaped_chars_repl[ESCAPED_CHARS_TABLE_SIZE];
#endif
static PyObject* markup;
static int
init_constants(void)
{
PyObject *module;
#if PY_MAJOR_VERSION < 3
/* mapping of characters to replace */
escaped_chars_repl['"'] = UNICHR(""");
escaped_chars_repl['\''] = UNICHR("'");
escaped_chars_repl['&'] = UNICHR("&");
escaped_chars_repl['<'] = UNICHR("<");
escaped_chars_repl['>'] = UNICHR(">");
/* lengths of those characters when replaced - 1 */
memset(escaped_chars_delta_len, 0, sizeof (escaped_chars_delta_len));
escaped_chars_delta_len['"'] = escaped_chars_delta_len['\''] = \
escaped_chars_delta_len['&'] = 4;
escaped_chars_delta_len['<'] = escaped_chars_delta_len['>'] = 3;
#endif
/* import markup type so that we can mark the return value */
module = PyImport_ImportModule("markupsafe");
if (!module)
return 0;
markup = PyObject_GetAttrString(module, "Markup");
Py_DECREF(module);
return 1;
}
#if PY_MAJOR_VERSION < 3
static PyObject*
escape_unicode(PyUnicodeObject *in)
{
PyUnicodeObject *out;
Py_UNICODE *inp = PyUnicode_AS_UNICODE(in);
const Py_UNICODE *inp_end = PyUnicode_AS_UNICODE(in) + PyUnicode_GET_SIZE(in);
Py_UNICODE *next_escp;
Py_UNICODE *outp;
Py_ssize_t delta=0, erepl=0, delta_len=0;
/* First we need to figure out how long the escaped string will be */
while (*(inp) || inp < inp_end) {
if (*inp < ESCAPED_CHARS_TABLE_SIZE) {
delta += escaped_chars_delta_len[*inp];
erepl += !!escaped_chars_delta_len[*inp];
}
++inp;
}
/* Do we need to escape anything at all? */
if (!erepl) {
Py_INCREF(in);
return (PyObject*)in;
}
out = (PyUnicodeObject*)PyUnicode_FromUnicode(NULL, PyUnicode_GET_SIZE(in) + delta);
if (!out)
return NULL;
outp = PyUnicode_AS_UNICODE(out);
inp = PyUnicode_AS_UNICODE(in);
while (erepl-- > 0) {
/* look for the next substitution */
next_escp = inp;
while (next_escp < inp_end) {
if (*next_escp < ESCAPED_CHARS_TABLE_SIZE &&
(delta_len = escaped_chars_delta_len[*next_escp])) {
++delta_len;
break;
}
++next_escp;
}
if (next_escp > inp) {
/* copy unescaped chars between inp and next_escp */
Py_UNICODE_COPY(outp, inp, next_escp-inp);
outp += next_escp - inp;
}
/* escape 'next_escp' */
Py_UNICODE_COPY(outp, escaped_chars_repl[*next_escp], delta_len);
outp += delta_len;
inp = next_escp + 1;
}
if (inp < inp_end)
Py_UNICODE_COPY(outp, inp, PyUnicode_GET_SIZE(in) - (inp - PyUnicode_AS_UNICODE(in)));
return (PyObject*)out;
}
#else /* PY_MAJOR_VERSION < 3 */
#define GET_DELTA(inp, inp_end, delta) \
while (inp < inp_end) { \
switch (*inp++) { \
case '"': \
case '\'': \
case '&': \
delta += 4; \
break; \
case '<': \
case '>': \
delta += 3; \
break; \
} \
}
#define DO_ESCAPE(inp, inp_end, outp) \
{ \
Py_ssize_t ncopy = 0; \
while (inp < inp_end) { \
switch (*inp) { \
case '"': \
memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
outp += ncopy; ncopy = 0; \
*outp++ = '&'; \
*outp++ = '#'; \
*outp++ = '3'; \
*outp++ = '4'; \
*outp++ = ';'; \
break; \
case '\'': \
memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
outp += ncopy; ncopy = 0; \
*outp++ = '&'; \
*outp++ = '#'; \
*outp++ = '3'; \
*outp++ = '9'; \
*outp++ = ';'; \
break; \
case '&': \
memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
outp += ncopy; ncopy = 0; \
*outp++ = '&'; \
*outp++ = 'a'; \
*outp++ = 'm'; \
*outp++ = 'p'; \
*outp++ = ';'; \
break; \
case '<': \
memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
outp += ncopy; ncopy = 0; \
*outp++ = '&'; \
*outp++ = 'l'; \
*outp++ = 't'; \
*outp++ = ';'; \
break; \
case '>': \
memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
outp += ncopy; ncopy = 0; \
*outp++ = '&'; \
*outp++ = 'g'; \
*outp++ = 't'; \
*outp++ = ';'; \
break; \
default: \
ncopy++; \
} \
inp++; \
} \
memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
}
static PyObject*
escape_unicode_kind1(PyUnicodeObject *in)
{
Py_UCS1 *inp = PyUnicode_1BYTE_DATA(in);
Py_UCS1 *inp_end = inp + PyUnicode_GET_LENGTH(in);
Py_UCS1 *outp;
PyObject *out;
Py_ssize_t delta = 0;
GET_DELTA(inp, inp_end, delta);
if (!delta) {
Py_INCREF(in);
return (PyObject*)in;
}
out = PyUnicode_New(PyUnicode_GET_LENGTH(in) + delta,
PyUnicode_IS_ASCII(in) ? 127 : 255);
if (!out)
return NULL;
inp = PyUnicode_1BYTE_DATA(in);
outp = PyUnicode_1BYTE_DATA(out);
DO_ESCAPE(inp, inp_end, outp);
return out;
}
static PyObject*
escape_unicode_kind2(PyUnicodeObject *in)
{
Py_UCS2 *inp = PyUnicode_2BYTE_DATA(in);
Py_UCS2 *inp_end = inp + PyUnicode_GET_LENGTH(in);
Py_UCS2 *outp;
PyObject *out;
Py_ssize_t delta = 0;
GET_DELTA(inp, inp_end, delta);
if (!delta) {
Py_INCREF(in);
return (PyObject*)in;
}
out = PyUnicode_New(PyUnicode_GET_LENGTH(in) + delta, 65535);
if (!out)
return NULL;
inp = PyUnicode_2BYTE_DATA(in);
outp = PyUnicode_2BYTE_DATA(out);
DO_ESCAPE(inp, inp_end, outp);
return out;
}
static PyObject*
escape_unicode_kind4(PyUnicodeObject *in)
{
Py_UCS4 *inp = PyUnicode_4BYTE_DATA(in);
Py_UCS4 *inp_end = inp + PyUnicode_GET_LENGTH(in);
Py_UCS4 *outp;
PyObject *out;
Py_ssize_t delta = 0;
GET_DELTA(inp, inp_end, delta);
if (!delta) {
Py_INCREF(in);
return (PyObject*)in;
}
out = PyUnicode_New(PyUnicode_GET_LENGTH(in) + delta, 1114111);
if (!out)
return NULL;
inp = PyUnicode_4BYTE_DATA(in);
outp = PyUnicode_4BYTE_DATA(out);
DO_ESCAPE(inp, inp_end, outp);
return out;
}
static PyObject*
escape_unicode(PyUnicodeObject *in)
{
if (PyUnicode_READY(in))
return NULL;
switch (PyUnicode_KIND(in)) {
case PyUnicode_1BYTE_KIND:
return escape_unicode_kind1(in);
case PyUnicode_2BYTE_KIND:
return escape_unicode_kind2(in);
case PyUnicode_4BYTE_KIND:
return escape_unicode_kind4(in);
}
assert(0); /* shouldn't happen */
return NULL;
}
#endif /* PY_MAJOR_VERSION < 3 */
static PyObject*
escape(PyObject *self, PyObject *text)
{
static PyObject *id_html;
PyObject *s = NULL, *rv = NULL, *html;
if (id_html == NULL) {
#if PY_MAJOR_VERSION < 3
id_html = PyString_InternFromString("__html__");
#else
id_html = PyUnicode_InternFromString("__html__");
#endif
if (id_html == NULL) {
return NULL;
}
}
/* we don't have to escape integers, bools or floats */
if (PyLong_CheckExact(text) ||
#if PY_MAJOR_VERSION < 3
PyInt_CheckExact(text) ||
#endif
PyFloat_CheckExact(text) || PyBool_Check(text) ||
text == Py_None)
return PyObject_CallFunctionObjArgs(markup, text, NULL);
/* if the object has an __html__ method that performs the escaping */
html = PyObject_GetAttr(text ,id_html);
if (html) {
s = PyObject_CallObject(html, NULL);
Py_DECREF(html);
if (s == NULL) {
return NULL;
}
/* Convert to Markup object */
rv = PyObject_CallFunctionObjArgs(markup, (PyObject*)s, NULL);
Py_DECREF(s);
return rv;
}
/* otherwise make the object unicode if it isn't, then escape */
PyErr_Clear();
if (!PyUnicode_Check(text)) {
#if PY_MAJOR_VERSION < 3
PyObject *unicode = PyObject_Unicode(text);
#else
PyObject *unicode = PyObject_Str(text);
#endif
if (!unicode)
return NULL;
s = escape_unicode((PyUnicodeObject*)unicode);
Py_DECREF(unicode);
}
else
s = escape_unicode((PyUnicodeObject*)text);
/* convert the unicode string into a markup object. */
rv = PyObject_CallFunctionObjArgs(markup, (PyObject*)s, NULL);
Py_DECREF(s);
return rv;
}
static PyObject*
escape_silent(PyObject *self, PyObject *text)
{
if (text != Py_None)
return escape(self, text);
return PyObject_CallFunctionObjArgs(markup, NULL);
}
static PyObject*
soft_unicode(PyObject *self, PyObject *s)
{
if (!PyUnicode_Check(s))
#if PY_MAJOR_VERSION < 3
return PyObject_Unicode(s);
#else
return PyObject_Str(s);
#endif
Py_INCREF(s);
return s;
}
static PyMethodDef module_methods[] = {
{"escape", (PyCFunction)escape, METH_O,
"escape(s) -> markup\n\n"
"Convert the characters &, <, >, ', and \" in string s to HTML-safe\n"
"sequences. Use this if you need to display text that might contain\n"
"such characters in HTML. Marks return value as markup string."},
{"escape_silent", (PyCFunction)escape_silent, METH_O,
"escape_silent(s) -> markup\n\n"
"Like escape but converts None to an empty string."},
{"soft_unicode", (PyCFunction)soft_unicode, METH_O,
"soft_unicode(object) -> string\n\n"
"Make a string unicode if it isn't already. That way a markup\n"
"string is not converted back to unicode."},
{NULL, NULL, 0, NULL} /* Sentinel */
};
#if PY_MAJOR_VERSION < 3
#ifndef PyMODINIT_FUNC /* declarations for DLL import/export */
#define PyMODINIT_FUNC void
#endif
PyMODINIT_FUNC
init_speedups(void)
{
if (!init_constants())
return;
Py_InitModule3("markupsafe._speedups", module_methods, "");
}
#else /* Python 3.x module initialization */
static struct PyModuleDef module_definition = {
PyModuleDef_HEAD_INIT,
"markupsafe._speedups",
NULL,
-1,
module_methods,
NULL,
NULL,
NULL,
NULL
};
PyMODINIT_FUNC
PyInit__speedups(void)
{
if (!init_constants())
return NULL;
return PyModule_Create(&module_definition);
}
#endif
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