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cpython/Objects/stringlib/repr.h at code-gen-add-parser · faster-cpython/cpython · GitHub

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/* stringlib: repr() implementation */

#ifndef STRINGLIB_FASTSEARCH_H

#error must include "stringlib/fastsearch.h" before including this module

#endif

static void

STRINGLIB(repr)(PyObject *unicode, Py_UCS4 quote,

STRINGLIB_CHAR *odata)

{

Py_ssize_t isize = PyUnicode_GET_LENGTH(unicode);

const void *idata = PyUnicode_DATA(unicode);

int ikind = PyUnicode_KIND(unicode);

*odata++ = quote;

for (Py_ssize_t i = 0; i < isize; i++) {

Py_UCS4 ch = PyUnicode_READ(ikind, idata, i);

/* Escape quotes and backslashes */

if ((ch == quote) || (ch == '\\')) {

*odata++ = '\\';

*odata++ = ch;

continue;

}

/* Map special whitespace to '\t', \n', '\r' */

if (ch == '\t') {

*odata++ = '\\';

*odata++ = 't';

}

else if (ch == '\n') {

*odata++ = '\\';

*odata++ = 'n';

}

else if (ch == '\r') {

*odata++ = '\\';

*odata++ = 'r';

}

/* Map non-printable US ASCII to '\xhh' */

else if (ch < ' ' || ch == 0x7F) {

*odata++ = '\\';

*odata++ = 'x';

*odata++ = Py_hexdigits[(ch >> 4) & 0x000F];

*odata++ = Py_hexdigits[ch & 0x000F];

}

/* Copy ASCII characters as-is */

else if (ch < 0x7F) {

*odata++ = ch;

}

/* Non-ASCII characters */

else {

/* Map Unicode whitespace and control characters

(categories Z* and C* except ASCII space)

*/

if (!Py_UNICODE_ISPRINTABLE(ch)) {

*odata++ = '\\';

/* Map 8-bit characters to '\xhh' */

if (ch <= 0xff) {

*odata++ = 'x';

*odata++ = Py_hexdigits[(ch >> 4) & 0x000F];

*odata++ = Py_hexdigits[ch & 0x000F];

}

/* Map 16-bit characters to '\uxxxx' */

else if (ch <= 0xffff) {

*odata++ = 'u';

*odata++ = Py_hexdigits[(ch >> 12) & 0xF];

*odata++ = Py_hexdigits[(ch >> 8) & 0xF];

*odata++ = Py_hexdigits[(ch >> 4) & 0xF];

*odata++ = Py_hexdigits[ch & 0xF];

}

/* Map 21-bit characters to '\U00xxxxxx' */

else {

*odata++ = 'U';

*odata++ = Py_hexdigits[(ch >> 28) & 0xF];

*odata++ = Py_hexdigits[(ch >> 24) & 0xF];

*odata++ = Py_hexdigits[(ch >> 20) & 0xF];

*odata++ = Py_hexdigits[(ch >> 16) & 0xF];

*odata++ = Py_hexdigits[(ch >> 12) & 0xF];

*odata++ = Py_hexdigits[(ch >> 8) & 0xF];

*odata++ = Py_hexdigits[(ch >> 4) & 0xF];

*odata++ = Py_hexdigits[ch & 0xF];

}

}

/* Copy characters as-is */

else {

*odata++ = ch;

}

}

}

*odata = quote;

}

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