mirror of https://github.com/python/cpython
633 lines
20 KiB
C
633 lines
20 KiB
C
#include "Python.h"
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#define DEFAULT_ENCODING "utf-8"
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#define S_CHAR(c) (c >= ' ' && c <= '~' && c != '\\' && c != '"')
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#define MIN_EXPANSION 6
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#ifdef Py_UNICODE_WIDE
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#define MAX_EXPANSION (2 * MIN_EXPANSION)
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#else
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#define MAX_EXPANSION MIN_EXPANSION
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#endif
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static Py_ssize_t
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ascii_escape_char(Py_UNICODE c, char *output, Py_ssize_t chars)
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{
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Py_UNICODE x;
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output[chars++] = '\\';
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switch (c) {
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case '\\': output[chars++] = (char)c; break;
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case '"': output[chars++] = (char)c; break;
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case '\b': output[chars++] = 'b'; break;
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case '\f': output[chars++] = 'f'; break;
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case '\n': output[chars++] = 'n'; break;
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case '\r': output[chars++] = 'r'; break;
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case '\t': output[chars++] = 't'; break;
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default:
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#ifdef Py_UNICODE_WIDE
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if (c >= 0x10000) {
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/* UTF-16 surrogate pair */
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Py_UNICODE v = c - 0x10000;
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c = 0xd800 | ((v >> 10) & 0x3ff);
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output[chars++] = 'u';
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x = (c & 0xf000) >> 12;
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output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
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x = (c & 0x0f00) >> 8;
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output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
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x = (c & 0x00f0) >> 4;
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output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
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x = (c & 0x000f);
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output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
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c = 0xdc00 | (v & 0x3ff);
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output[chars++] = '\\';
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}
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#endif
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output[chars++] = 'u';
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x = (c & 0xf000) >> 12;
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output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
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x = (c & 0x0f00) >> 8;
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output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
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x = (c & 0x00f0) >> 4;
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output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
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x = (c & 0x000f);
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output[chars++] = (x < 10) ? '0' + x : 'a' + (x - 10);
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}
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return chars;
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}
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static PyObject *
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ascii_escape_unicode(PyObject *pystr)
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{
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Py_ssize_t i;
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Py_ssize_t input_chars;
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Py_ssize_t output_size;
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Py_ssize_t chars;
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PyObject *rval;
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char *output;
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Py_UNICODE *input_unicode;
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input_chars = PyUnicode_GET_SIZE(pystr);
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input_unicode = PyUnicode_AS_UNICODE(pystr);
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/* One char input can be up to 6 chars output, estimate 4 of these */
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output_size = 2 + (MIN_EXPANSION * 4) + input_chars;
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rval = PyBytes_FromStringAndSize(NULL, output_size);
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if (rval == NULL) {
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return NULL;
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}
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output = PyBytes_AS_STRING(rval);
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chars = 0;
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output[chars++] = '"';
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for (i = 0; i < input_chars; i++) {
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Py_UNICODE c = input_unicode[i];
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if (S_CHAR(c)) {
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output[chars++] = (char)c;
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}
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else {
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chars = ascii_escape_char(c, output, chars);
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}
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if (output_size - chars < (1 + MAX_EXPANSION)) {
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/* There's more than four, so let's resize by a lot */
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output_size *= 2;
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/* This is an upper bound */
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if (output_size > 2 + (input_chars * MAX_EXPANSION)) {
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output_size = 2 + (input_chars * MAX_EXPANSION);
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}
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if (_PyBytes_Resize(&rval, output_size) == -1) {
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return NULL;
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}
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output = PyBytes_AS_STRING(rval);
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}
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}
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output[chars++] = '"';
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if (_PyBytes_Resize(&rval, chars) == -1) {
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return NULL;
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}
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return rval;
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}
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static PyObject *
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ascii_escape_str(PyObject *pystr)
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{
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Py_ssize_t i;
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Py_ssize_t input_chars;
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Py_ssize_t output_size;
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Py_ssize_t chars;
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PyObject *rval;
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char *output;
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char *input_str;
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input_chars = PyBytes_GET_SIZE(pystr);
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input_str = PyBytes_AS_STRING(pystr);
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/* One char input can be up to 6 chars output, estimate 4 of these */
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output_size = 2 + (MIN_EXPANSION * 4) + input_chars;
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rval = PyBytes_FromStringAndSize(NULL, output_size);
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if (rval == NULL) {
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return NULL;
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}
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output = PyBytes_AS_STRING(rval);
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chars = 0;
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output[chars++] = '"';
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for (i = 0; i < input_chars; i++) {
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Py_UNICODE c = (Py_UNICODE)input_str[i];
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if (S_CHAR(c)) {
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output[chars++] = (char)c;
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}
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else if (c > 0x7F) {
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/* We hit a non-ASCII character, bail to unicode mode */
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PyObject *uni;
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Py_DECREF(rval);
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uni = PyUnicode_DecodeUTF8(input_str, input_chars, "strict");
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if (uni == NULL) {
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return NULL;
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}
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rval = ascii_escape_unicode(uni);
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Py_DECREF(uni);
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return rval;
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}
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else {
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chars = ascii_escape_char(c, output, chars);
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}
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/* An ASCII char can't possibly expand to a surrogate! */
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if (output_size - chars < (1 + MIN_EXPANSION)) {
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/* There's more than four, so let's resize by a lot */
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output_size *= 2;
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if (output_size > 2 + (input_chars * MIN_EXPANSION)) {
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output_size = 2 + (input_chars * MIN_EXPANSION);
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}
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if (_PyBytes_Resize(&rval, output_size) == -1) {
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return NULL;
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}
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output = PyBytes_AS_STRING(rval);
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}
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}
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output[chars++] = '"';
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if (_PyBytes_Resize(&rval, chars) == -1) {
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return NULL;
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}
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return rval;
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}
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void
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raise_errmsg(char *msg, PyObject *s, Py_ssize_t end)
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{
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static PyObject *errmsg_fn = NULL;
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PyObject *pymsg;
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if (errmsg_fn == NULL) {
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PyObject *decoder = PyImport_ImportModule("json.decoder");
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if (decoder == NULL)
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return;
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errmsg_fn = PyObject_GetAttrString(decoder, "errmsg");
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if (errmsg_fn == NULL)
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return;
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Py_XDECREF(decoder);
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}
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pymsg = PyObject_CallFunction(errmsg_fn, "(zOn)", msg, s, end);
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PyErr_SetObject(PyExc_ValueError, pymsg);
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Py_DECREF(pymsg);
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/*
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def linecol(doc, pos):
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lineno = doc.count('\n', 0, pos) + 1
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if lineno == 1:
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colno = pos
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else:
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colno = pos - doc.rindex('\n', 0, pos)
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return lineno, colno
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def errmsg(msg, doc, pos, end=None):
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lineno, colno = linecol(doc, pos)
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if end is None:
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return '%s: line %d column %d (char %d)' % (msg, lineno, colno, pos)
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endlineno, endcolno = linecol(doc, end)
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return '%s: line %d column %d - line %d column %d (char %d - %d)' % (
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msg, lineno, colno, endlineno, endcolno, pos, end)
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*/
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}
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static PyObject *
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join_list_unicode(PyObject *lst)
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{
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static PyObject *ustr = NULL;
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static PyObject *joinstr = NULL;
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if (ustr == NULL) {
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Py_UNICODE c = 0;
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ustr = PyUnicode_FromUnicode(&c, 0);
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}
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if (joinstr == NULL) {
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joinstr = PyUnicode_InternFromString("join");
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}
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if (joinstr == NULL || ustr == NULL) {
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return NULL;
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}
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return PyObject_CallMethodObjArgs(ustr, joinstr, lst, NULL);
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}
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static PyObject *
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scanstring_str(PyObject *pystr, Py_ssize_t end, char *encoding, int strict)
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{
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PyObject *rval;
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Py_ssize_t len = PyBytes_GET_SIZE(pystr);
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Py_ssize_t begin = end - 1;
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Py_ssize_t next = begin;
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char *buf = PyBytes_AS_STRING(pystr);
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Py_buffer info;
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PyObject *chunks = PyList_New(0);
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if (chunks == NULL) {
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goto bail;
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}
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while (1) {
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/* Find the end of the string or the next escape */
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Py_UNICODE c = 0;
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PyObject *chunk = NULL;
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for (next = end; next < len; next++) {
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c = buf[next];
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if (c == '"' || c == '\\') {
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break;
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}
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else if (strict && c <= 0x1f) {
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raise_errmsg("Invalid control character at", pystr, begin);
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goto bail;
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}
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}
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if (!(c == '"' || c == '\\')) {
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raise_errmsg("Unterminated string starting at", pystr, begin);
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goto bail;
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}
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/* Pick up this chunk if it's not zero length */
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if (next != end) {
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PyObject *strchunk;
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if (PyBuffer_FillInfo(&info, &buf[end], next - end, 1, 0) < 0) {
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goto bail;
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}
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strchunk = PyMemoryView_FromMemory(&info);
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if (strchunk == NULL) {
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goto bail;
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}
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chunk = PyUnicode_FromEncodedObject(strchunk, encoding, NULL);
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Py_DECREF(strchunk);
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if (chunk == NULL) {
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goto bail;
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}
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if (PyList_Append(chunks, chunk)) {
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goto bail;
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}
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Py_DECREF(chunk);
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}
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next++;
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if (c == '"') {
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end = next;
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break;
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}
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if (next == len) {
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raise_errmsg("Unterminated string starting at", pystr, begin);
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goto bail;
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}
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c = buf[next];
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if (c != 'u') {
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/* Non-unicode backslash escapes */
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end = next + 1;
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switch (c) {
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case '"': break;
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case '\\': break;
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case '/': break;
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case 'b': c = '\b'; break;
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case 'f': c = '\f'; break;
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case 'n': c = '\n'; break;
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case 'r': c = '\r'; break;
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case 't': c = '\t'; break;
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default: c = 0;
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}
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if (c == 0) {
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raise_errmsg("Invalid \\escape", pystr, end - 2);
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goto bail;
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}
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}
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else {
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c = 0;
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next++;
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end = next + 4;
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if (end >= len) {
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raise_errmsg("Invalid \\uXXXX escape", pystr, next - 1);
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goto bail;
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}
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/* Decode 4 hex digits */
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for (; next < end; next++) {
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Py_ssize_t shl = (end - next - 1) << 2;
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Py_UNICODE digit = buf[next];
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switch (digit) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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c |= (digit - '0') << shl; break;
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case 'a': case 'b': case 'c': case 'd': case 'e':
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case 'f':
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c |= (digit - 'a' + 10) << shl; break;
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case 'A': case 'B': case 'C': case 'D': case 'E':
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case 'F':
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c |= (digit - 'A' + 10) << shl; break;
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default:
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raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
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goto bail;
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}
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}
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#ifdef Py_UNICODE_WIDE
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/* Surrogate pair */
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if (c >= 0xd800 && c <= 0xdbff) {
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Py_UNICODE c2 = 0;
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if (end + 6 >= len) {
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raise_errmsg("Invalid \\uXXXX\\uXXXX surrogate pair", pystr,
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end - 5);
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}
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if (buf[next++] != '\\' || buf[next++] != 'u') {
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raise_errmsg("Invalid \\uXXXX\\uXXXX surrogate pair", pystr,
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end - 5);
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}
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end += 6;
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/* Decode 4 hex digits */
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for (; next < end; next++) {
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Py_ssize_t shl = (end - next - 1) << 2;
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Py_UNICODE digit = buf[next];
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switch (digit) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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c2 |= (digit - '0') << shl; break;
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case 'a': case 'b': case 'c': case 'd': case 'e':
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case 'f':
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c2 |= (digit - 'a' + 10) << shl; break;
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case 'A': case 'B': case 'C': case 'D': case 'E':
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case 'F':
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c2 |= (digit - 'A' + 10) << shl; break;
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default:
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raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
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goto bail;
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}
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}
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c = 0x10000 + (((c - 0xd800) << 10) | (c2 - 0xdc00));
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}
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#endif
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}
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chunk = PyUnicode_FromUnicode(&c, 1);
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if (chunk == NULL) {
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goto bail;
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}
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if (PyList_Append(chunks, chunk)) {
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goto bail;
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}
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Py_DECREF(chunk);
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}
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rval = join_list_unicode(chunks);
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if (rval == NULL) {
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goto bail;
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}
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Py_DECREF(chunks);
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chunks = NULL;
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return Py_BuildValue("(Nn)", rval, end);
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bail:
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Py_XDECREF(chunks);
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return NULL;
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}
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static PyObject *
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scanstring_unicode(PyObject *pystr, Py_ssize_t end, int strict)
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{
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PyObject *rval;
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Py_ssize_t len = PyUnicode_GET_SIZE(pystr);
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Py_ssize_t begin = end - 1;
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Py_ssize_t next = begin;
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const Py_UNICODE *buf = PyUnicode_AS_UNICODE(pystr);
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PyObject *chunks = PyList_New(0);
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if (chunks == NULL) {
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goto bail;
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}
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while (1) {
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/* Find the end of the string or the next escape */
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Py_UNICODE c = 0;
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PyObject *chunk = NULL;
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for (next = end; next < len; next++) {
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c = buf[next];
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if (c == '"' || c == '\\') {
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break;
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}
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else if (strict && c <= 0x1f) {
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raise_errmsg("Invalid control character at", pystr, begin);
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goto bail;
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}
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}
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if (!(c == '"' || c == '\\')) {
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raise_errmsg("Unterminated string starting at", pystr, begin);
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goto bail;
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}
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/* Pick up this chunk if it's not zero length */
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if (next != end) {
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chunk = PyUnicode_FromUnicode(&buf[end], next - end);
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if (chunk == NULL) {
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goto bail;
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}
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if (PyList_Append(chunks, chunk)) {
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goto bail;
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}
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Py_DECREF(chunk);
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}
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next++;
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if (c == '"') {
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end = next;
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break;
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}
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if (next == len) {
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raise_errmsg("Unterminated string starting at", pystr, begin);
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goto bail;
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}
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c = buf[next];
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if (c != 'u') {
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/* Non-unicode backslash escapes */
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end = next + 1;
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switch (c) {
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case '"': break;
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case '\\': break;
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case '/': break;
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case 'b': c = '\b'; break;
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case 'f': c = '\f'; break;
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case 'n': c = '\n'; break;
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case 'r': c = '\r'; break;
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case 't': c = '\t'; break;
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default: c = 0;
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}
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if (c == 0) {
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raise_errmsg("Invalid \\escape", pystr, end - 2);
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goto bail;
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}
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}
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else {
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c = 0;
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next++;
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end = next + 4;
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if (end >= len) {
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raise_errmsg("Invalid \\uXXXX escape", pystr, next - 1);
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goto bail;
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}
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/* Decode 4 hex digits */
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for (; next < end; next++) {
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Py_ssize_t shl = (end - next - 1) << 2;
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Py_UNICODE digit = buf[next];
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switch (digit) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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c |= (digit - '0') << shl; break;
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case 'a': case 'b': case 'c': case 'd': case 'e':
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case 'f':
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c |= (digit - 'a' + 10) << shl; break;
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case 'A': case 'B': case 'C': case 'D': case 'E':
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case 'F':
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c |= (digit - 'A' + 10) << shl; break;
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default:
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raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
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goto bail;
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}
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}
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#ifdef Py_UNICODE_WIDE
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/* Surrogate pair */
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if (c >= 0xd800 && c <= 0xdbff) {
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Py_UNICODE c2 = 0;
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if (end + 6 >= len) {
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raise_errmsg("Invalid \\uXXXX\\uXXXX surrogate pair", pystr,
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|
end - 5);
|
|
}
|
|
if (buf[next++] != '\\' || buf[next++] != 'u') {
|
|
raise_errmsg("Invalid \\uXXXX\\uXXXX surrogate pair", pystr,
|
|
end - 5);
|
|
}
|
|
end += 6;
|
|
/* Decode 4 hex digits */
|
|
for (; next < end; next++) {
|
|
Py_ssize_t shl = (end - next - 1) << 2;
|
|
Py_UNICODE digit = buf[next];
|
|
switch (digit) {
|
|
case '0': case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7': case '8': case '9':
|
|
c2 |= (digit - '0') << shl; break;
|
|
case 'a': case 'b': case 'c': case 'd': case 'e':
|
|
case 'f':
|
|
c2 |= (digit - 'a' + 10) << shl; break;
|
|
case 'A': case 'B': case 'C': case 'D': case 'E':
|
|
case 'F':
|
|
c2 |= (digit - 'A' + 10) << shl; break;
|
|
default:
|
|
raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
|
|
goto bail;
|
|
}
|
|
}
|
|
c = 0x10000 + (((c - 0xd800) << 10) | (c2 - 0xdc00));
|
|
}
|
|
#endif
|
|
}
|
|
chunk = PyUnicode_FromUnicode(&c, 1);
|
|
if (chunk == NULL) {
|
|
goto bail;
|
|
}
|
|
if (PyList_Append(chunks, chunk)) {
|
|
goto bail;
|
|
}
|
|
Py_DECREF(chunk);
|
|
}
|
|
|
|
rval = join_list_unicode(chunks);
|
|
if (rval == NULL) {
|
|
goto bail;
|
|
}
|
|
Py_DECREF(chunks);
|
|
chunks = NULL;
|
|
return Py_BuildValue("(Nn)", rval, end);
|
|
bail:
|
|
Py_XDECREF(chunks);
|
|
return NULL;
|
|
}
|
|
|
|
PyDoc_STRVAR(pydoc_scanstring,
|
|
"scanstring(str_or_bytes, end, encoding) -> (bytes, end)\n");
|
|
|
|
static PyObject *
|
|
py_scanstring(PyObject* self, PyObject *args)
|
|
{
|
|
PyObject *pystr;
|
|
Py_ssize_t end;
|
|
char *encoding = NULL;
|
|
int strict = 0;
|
|
if (!PyArg_ParseTuple(args, "On|zi:scanstring", &pystr, &end, &encoding, &strict)) {
|
|
return NULL;
|
|
}
|
|
if (encoding == NULL) {
|
|
encoding = DEFAULT_ENCODING;
|
|
}
|
|
if (PyBytes_Check(pystr)) {
|
|
return scanstring_str(pystr, end, encoding, strict);
|
|
}
|
|
else if (PyUnicode_Check(pystr)) {
|
|
return scanstring_unicode(pystr, end, strict);
|
|
}
|
|
else {
|
|
PyErr_Format(PyExc_TypeError,
|
|
"first argument must be a string or bytes, not %.80s",
|
|
Py_TYPE(pystr)->tp_name);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
PyDoc_STRVAR(pydoc_encode_basestring_ascii,
|
|
"encode_basestring_ascii(str_or_bytes) -> bytes\n");
|
|
|
|
static PyObject *
|
|
py_encode_basestring_ascii(PyObject* self, PyObject *pystr)
|
|
{
|
|
PyObject *rval;
|
|
/* METH_O */
|
|
if (PyBytes_Check(pystr)) {
|
|
rval = ascii_escape_str(pystr);
|
|
}
|
|
else if (PyUnicode_Check(pystr)) {
|
|
rval = ascii_escape_unicode(pystr);
|
|
}
|
|
else {
|
|
PyErr_Format(PyExc_TypeError,
|
|
"first argument must be a string or unicode, not %.80s",
|
|
Py_TYPE(pystr)->tp_name);
|
|
return NULL;
|
|
}
|
|
if (PyBytes_Check(rval)) {
|
|
PyObject *urval = PyUnicode_DecodeASCII(PyBytes_AS_STRING(rval), PyBytes_GET_SIZE(rval), NULL);
|
|
Py_DECREF(rval);
|
|
return urval;
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
static PyMethodDef json_methods[] = {
|
|
{"encode_basestring_ascii", (PyCFunction)py_encode_basestring_ascii,
|
|
METH_O, pydoc_encode_basestring_ascii},
|
|
{"scanstring", (PyCFunction)py_scanstring, METH_VARARGS,
|
|
pydoc_scanstring},
|
|
{NULL, NULL, 0, NULL}
|
|
};
|
|
|
|
PyDoc_STRVAR(module_doc,
|
|
"json speedups\n");
|
|
|
|
static struct PyModuleDef jsonmodule = {
|
|
PyModuleDef_HEAD_INIT,
|
|
"_json",
|
|
module_doc,
|
|
-1,
|
|
json_methods,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
PyObject*
|
|
PyInit__json(void)
|
|
{
|
|
return PyModule_Create(&jsonmodule);
|
|
}
|