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      1 #include "Python.h"
      2 #include "structmember.h"
      3 #if PY_VERSION_HEX < 0x02070000 && !defined(PyOS_string_to_double)
      4 #define PyOS_string_to_double json_PyOS_string_to_double
      5 static double
      6 json_PyOS_string_to_double(const char *s, char **endptr, PyObject *overflow_exception);
      7 static double
      8 json_PyOS_string_to_double(const char *s, char **endptr, PyObject *overflow_exception) {
      9     double x;
     10     assert(endptr == NULL);
     11     assert(overflow_exception == NULL);
     12     PyFPE_START_PROTECT("json_PyOS_string_to_double", return -1.0;)
     13     x = PyOS_ascii_atof(s);
     14     PyFPE_END_PROTECT(x)
     15     return x;
     16 }
     17 #endif
     18 #if PY_VERSION_HEX < 0x02060000 && !defined(Py_TYPE)
     19 #define Py_TYPE(ob)     (((PyObject*)(ob))->ob_type)
     20 #endif
     21 #if PY_VERSION_HEX < 0x02060000 && !defined(Py_SIZE)
     22 #define Py_SIZE(ob)     (((PyVarObject*)(ob))->ob_size)
     23 #endif
     24 #if PY_VERSION_HEX < 0x02050000 && !defined(PY_SSIZE_T_MIN)
     25 typedef int Py_ssize_t;
     26 #define PY_SSIZE_T_MAX INT_MAX
     27 #define PY_SSIZE_T_MIN INT_MIN
     28 #define PyInt_FromSsize_t PyInt_FromLong
     29 #define PyInt_AsSsize_t PyInt_AsLong
     30 #endif
     31 #ifndef Py_IS_FINITE
     32 #define Py_IS_FINITE(X) (!Py_IS_INFINITY(X) && !Py_IS_NAN(X))
     33 #endif
     34 
     35 #ifdef __GNUC__
     36 #define UNUSED __attribute__((__unused__))
     37 #else
     38 #define UNUSED
     39 #endif
     40 
     41 #define DEFAULT_ENCODING "utf-8"
     42 
     43 #define PyScanner_Check(op) PyObject_TypeCheck(op, &PyScannerType)
     44 #define PyScanner_CheckExact(op) (Py_TYPE(op) == &PyScannerType)
     45 #define PyEncoder_Check(op) PyObject_TypeCheck(op, &PyEncoderType)
     46 #define PyEncoder_CheckExact(op) (Py_TYPE(op) == &PyEncoderType)
     47 
     48 static PyTypeObject PyScannerType;
     49 static PyTypeObject PyEncoderType;
     50 
     51 typedef struct _PyScannerObject {
     52     PyObject_HEAD
     53     PyObject *encoding;
     54     PyObject *strict;
     55     PyObject *object_hook;
     56     PyObject *pairs_hook;
     57     PyObject *parse_float;
     58     PyObject *parse_int;
     59     PyObject *parse_constant;
     60     PyObject *memo;
     61 } PyScannerObject;
     62 
     63 static PyMemberDef scanner_members[] = {
     64     {"encoding", T_OBJECT, offsetof(PyScannerObject, encoding), READONLY, "encoding"},
     65     {"strict", T_OBJECT, offsetof(PyScannerObject, strict), READONLY, "strict"},
     66     {"object_hook", T_OBJECT, offsetof(PyScannerObject, object_hook), READONLY, "object_hook"},
     67     {"object_pairs_hook", T_OBJECT, offsetof(PyScannerObject, pairs_hook), READONLY, "object_pairs_hook"},
     68     {"parse_float", T_OBJECT, offsetof(PyScannerObject, parse_float), READONLY, "parse_float"},
     69     {"parse_int", T_OBJECT, offsetof(PyScannerObject, parse_int), READONLY, "parse_int"},
     70     {"parse_constant", T_OBJECT, offsetof(PyScannerObject, parse_constant), READONLY, "parse_constant"},
     71     {NULL}
     72 };
     73 
     74 typedef struct _PyEncoderObject {
     75     PyObject_HEAD
     76     PyObject *markers;
     77     PyObject *defaultfn;
     78     PyObject *encoder;
     79     PyObject *indent;
     80     PyObject *key_separator;
     81     PyObject *item_separator;
     82     PyObject *sort_keys;
     83     PyObject *skipkeys;
     84     PyObject *key_memo;
     85     PyObject *Decimal;
     86     int fast_encode;
     87     int allow_nan;
     88     int use_decimal;
     89     int namedtuple_as_object;
     90     int tuple_as_array;
     91     int bigint_as_string;
     92     PyObject *item_sort_key;
     93 } PyEncoderObject;
     94 
     95 static PyMemberDef encoder_members[] = {
     96     {"markers", T_OBJECT, offsetof(PyEncoderObject, markers), READONLY, "markers"},
     97     {"default", T_OBJECT, offsetof(PyEncoderObject, defaultfn), READONLY, "default"},
     98     {"encoder", T_OBJECT, offsetof(PyEncoderObject, encoder), READONLY, "encoder"},
     99     {"indent", T_OBJECT, offsetof(PyEncoderObject, indent), READONLY, "indent"},
    100     {"key_separator", T_OBJECT, offsetof(PyEncoderObject, key_separator), READONLY, "key_separator"},
    101     {"item_separator", T_OBJECT, offsetof(PyEncoderObject, item_separator), READONLY, "item_separator"},
    102     {"sort_keys", T_OBJECT, offsetof(PyEncoderObject, sort_keys), READONLY, "sort_keys"},
    103     {"skipkeys", T_OBJECT, offsetof(PyEncoderObject, skipkeys), READONLY, "skipkeys"},
    104     {"key_memo", T_OBJECT, offsetof(PyEncoderObject, key_memo), READONLY, "key_memo"},
    105     {"item_sort_key", T_OBJECT, offsetof(PyEncoderObject, item_sort_key), READONLY, "item_sort_key"},
    106     {NULL}
    107 };
    108 
    109 static PyObject *
    110 maybe_quote_bigint(PyObject *encoded, PyObject *obj);
    111 
    112 static Py_ssize_t
    113 ascii_escape_char(Py_UNICODE c, char *output, Py_ssize_t chars);
    114 static PyObject *
    115 ascii_escape_unicode(PyObject *pystr);
    116 static PyObject *
    117 ascii_escape_str(PyObject *pystr);
    118 static PyObject *
    119 py_encode_basestring_ascii(PyObject* self UNUSED, PyObject *pystr);
    120 void init_speedups(void);
    121 static PyObject *
    122 scan_once_str(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *next_idx_ptr);
    123 static PyObject *
    124 scan_once_unicode(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *next_idx_ptr);
    125 static PyObject *
    126 _build_rval_index_tuple(PyObject *rval, Py_ssize_t idx);
    127 static PyObject *
    128 scanner_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
    129 static int
    130 scanner_init(PyObject *self, PyObject *args, PyObject *kwds);
    131 static void
    132 scanner_dealloc(PyObject *self);
    133 static int
    134 scanner_clear(PyObject *self);
    135 static PyObject *
    136 encoder_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
    137 static int
    138 encoder_init(PyObject *self, PyObject *args, PyObject *kwds);
    139 static void
    140 encoder_dealloc(PyObject *self);
    141 static int
    142 encoder_clear(PyObject *self);
    143 static int
    144 encoder_listencode_list(PyEncoderObject *s, PyObject *rval, PyObject *seq, Py_ssize_t indent_level);
    145 static int
    146 encoder_listencode_obj(PyEncoderObject *s, PyObject *rval, PyObject *obj, Py_ssize_t indent_level);
    147 static int
    148 encoder_listencode_dict(PyEncoderObject *s, PyObject *rval, PyObject *dct, Py_ssize_t indent_level);
    149 static PyObject *
    150 _encoded_const(PyObject *obj);
    151 static void
    152 raise_errmsg(char *msg, PyObject *s, Py_ssize_t end);
    153 static PyObject *
    154 encoder_encode_string(PyEncoderObject *s, PyObject *obj);
    155 static int
    156 _convertPyInt_AsSsize_t(PyObject *o, Py_ssize_t *size_ptr);
    157 static PyObject *
    158 _convertPyInt_FromSsize_t(Py_ssize_t *size_ptr);
    159 static PyObject *
    160 encoder_encode_float(PyEncoderObject *s, PyObject *obj);
    161 static int
    162 _is_namedtuple(PyObject *obj);
    163 
    164 #define S_CHAR(c) (c >= ' ' && c <= '~' && c != '\\' && c != '"')
    165 #define IS_WHITESPACE(c) (((c) == ' ') || ((c) == '\t') || ((c) == '\n') || ((c) == '\r'))
    166 
    167 #define MIN_EXPANSION 6
    168 #ifdef Py_UNICODE_WIDE
    169 #define MAX_EXPANSION (2 * MIN_EXPANSION)
    170 #else
    171 #define MAX_EXPANSION MIN_EXPANSION
    172 #endif
    173 
    174 static PyObject *
    175 maybe_quote_bigint(PyObject *encoded, PyObject *obj)
    176 {
    177     static PyObject *big_long = NULL;
    178     static PyObject *small_long = NULL;
    179     if (big_long == NULL) {
    180         big_long = PyLong_FromLongLong(1LL << 53);
    181         if (big_long == NULL) {
    182             Py_DECREF(encoded);
    183             return NULL;
    184         }
    185     }
    186     if (small_long == NULL) {
    187         small_long = PyLong_FromLongLong(-1LL << 53);
    188         if (small_long == NULL) {
    189             Py_DECREF(encoded);
    190             return NULL;
    191         }
    192     }
    193     if (PyObject_RichCompareBool(obj, big_long, Py_GE) ||
    194         PyObject_RichCompareBool(obj, small_long, Py_LE)) {
    195         PyObject* quoted = PyString_FromFormat("\"%s\"",
    196                                                PyString_AsString(encoded));
    197         Py_DECREF(encoded);
    198         encoded = quoted;
    199     }
    200     return encoded;
    201 }
    202 
    203 static int
    204 _is_namedtuple(PyObject *obj)
    205 {
    206     int rval = 0;
    207     PyObject *_asdict = PyObject_GetAttrString(obj, "_asdict");
    208     if (_asdict == NULL) {
    209         PyErr_Clear();
    210         return 0;
    211     }
    212     rval = PyCallable_Check(_asdict);
    213     Py_DECREF(_asdict);
    214     return rval;
    215 }
    216 
    217 static int
    218 _convertPyInt_AsSsize_t(PyObject *o, Py_ssize_t *size_ptr)
    219 {
    220     /* PyObject to Py_ssize_t converter */
    221     *size_ptr = PyInt_AsSsize_t(o);
    222     if (*size_ptr == -1 && PyErr_Occurred())
    223         return 0;
    224     return 1;
    225 }
    226 
    227 static PyObject *
    228 _convertPyInt_FromSsize_t(Py_ssize_t *size_ptr)
    229 {
    230     /* Py_ssize_t to PyObject converter */
    231     return PyInt_FromSsize_t(*size_ptr);
    232 }
    233 
    234 static Py_ssize_t
    235 ascii_escape_char(Py_UNICODE c, char *output, Py_ssize_t chars)
    236 {
    237     /* Escape unicode code point c to ASCII escape sequences
    238     in char *output. output must have at least 12 bytes unused to
    239     accommodate an escaped surrogate pair "\uXXXX\uXXXX" */
    240     output[chars++] = '\\';
    241     switch (c) {
    242         case '\\': output[chars++] = (char)c; break;
    243         case '"': output[chars++] = (char)c; break;
    244         case '\b': output[chars++] = 'b'; break;
    245         case '\f': output[chars++] = 'f'; break;
    246         case '\n': output[chars++] = 'n'; break;
    247         case '\r': output[chars++] = 'r'; break;
    248         case '\t': output[chars++] = 't'; break;
    249         default:
    250 #ifdef Py_UNICODE_WIDE
    251             if (c >= 0x10000) {
    252                 /* UTF-16 surrogate pair */
    253                 Py_UNICODE v = c - 0x10000;
    254                 c = 0xd800 | ((v >> 10) & 0x3ff);
    255                 output[chars++] = 'u';
    256                 output[chars++] = "0123456789abcdef"[(c >> 12) & 0xf];
    257                 output[chars++] = "0123456789abcdef"[(c >>  8) & 0xf];
    258                 output[chars++] = "0123456789abcdef"[(c >>  4) & 0xf];
    259                 output[chars++] = "0123456789abcdef"[(c      ) & 0xf];
    260                 c = 0xdc00 | (v & 0x3ff);
    261                 output[chars++] = '\\';
    262             }
    263 #endif
    264             output[chars++] = 'u';
    265             output[chars++] = "0123456789abcdef"[(c >> 12) & 0xf];
    266             output[chars++] = "0123456789abcdef"[(c >>  8) & 0xf];
    267             output[chars++] = "0123456789abcdef"[(c >>  4) & 0xf];
    268             output[chars++] = "0123456789abcdef"[(c      ) & 0xf];
    269     }
    270     return chars;
    271 }
    272 
    273 static PyObject *
    274 ascii_escape_unicode(PyObject *pystr)
    275 {
    276     /* Take a PyUnicode pystr and return a new ASCII-only escaped PyString */
    277     Py_ssize_t i;
    278     Py_ssize_t input_chars;
    279     Py_ssize_t output_size;
    280     Py_ssize_t max_output_size;
    281     Py_ssize_t chars;
    282     PyObject *rval;
    283     char *output;
    284     Py_UNICODE *input_unicode;
    285 
    286     input_chars = PyUnicode_GET_SIZE(pystr);
    287     input_unicode = PyUnicode_AS_UNICODE(pystr);
    288 
    289     /* One char input can be up to 6 chars output, estimate 4 of these */
    290     output_size = 2 + (MIN_EXPANSION * 4) + input_chars;
    291     max_output_size = 2 + (input_chars * MAX_EXPANSION);
    292     rval = PyString_FromStringAndSize(NULL, output_size);
    293     if (rval == NULL) {
    294         return NULL;
    295     }
    296     output = PyString_AS_STRING(rval);
    297     chars = 0;
    298     output[chars++] = '"';
    299     for (i = 0; i < input_chars; i++) {
    300         Py_UNICODE c = input_unicode[i];
    301         if (S_CHAR(c)) {
    302             output[chars++] = (char)c;
    303         }
    304         else {
    305             chars = ascii_escape_char(c, output, chars);
    306         }
    307         if (output_size - chars < (1 + MAX_EXPANSION)) {
    308             /* There's more than four, so let's resize by a lot */
    309             Py_ssize_t new_output_size = output_size * 2;
    310             /* This is an upper bound */
    311             if (new_output_size > max_output_size) {
    312                 new_output_size = max_output_size;
    313             }
    314             /* Make sure that the output size changed before resizing */
    315             if (new_output_size != output_size) {
    316                 output_size = new_output_size;
    317                 if (_PyString_Resize(&rval, output_size) == -1) {
    318                     return NULL;
    319                 }
    320                 output = PyString_AS_STRING(rval);
    321             }
    322         }
    323     }
    324     output[chars++] = '"';
    325     if (_PyString_Resize(&rval, chars) == -1) {
    326         return NULL;
    327     }
    328     return rval;
    329 }
    330 
    331 static PyObject *
    332 ascii_escape_str(PyObject *pystr)
    333 {
    334     /* Take a PyString pystr and return a new ASCII-only escaped PyString */
    335     Py_ssize_t i;
    336     Py_ssize_t input_chars;
    337     Py_ssize_t output_size;
    338     Py_ssize_t chars;
    339     PyObject *rval;
    340     char *output;
    341     char *input_str;
    342 
    343     input_chars = PyString_GET_SIZE(pystr);
    344     input_str = PyString_AS_STRING(pystr);
    345 
    346     /* Fast path for a string that's already ASCII */
    347     for (i = 0; i < input_chars; i++) {
    348         Py_UNICODE c = (Py_UNICODE)(unsigned char)input_str[i];
    349         if (!S_CHAR(c)) {
    350             /* If we have to escape something, scan the string for unicode */
    351             Py_ssize_t j;
    352             for (j = i; j < input_chars; j++) {
    353                 c = (Py_UNICODE)(unsigned char)input_str[j];
    354                 if (c > 0x7f) {
    355                     /* We hit a non-ASCII character, bail to unicode mode */
    356                     PyObject *uni;
    357                     uni = PyUnicode_DecodeUTF8(input_str, input_chars, "strict");
    358                     if (uni == NULL) {
    359                         return NULL;
    360                     }
    361                     rval = ascii_escape_unicode(uni);
    362                     Py_DECREF(uni);
    363                     return rval;
    364                 }
    365             }
    366             break;
    367         }
    368     }
    369 
    370     if (i == input_chars) {
    371         /* Input is already ASCII */
    372         output_size = 2 + input_chars;
    373     }
    374     else {
    375         /* One char input can be up to 6 chars output, estimate 4 of these */
    376         output_size = 2 + (MIN_EXPANSION * 4) + input_chars;
    377     }
    378     rval = PyString_FromStringAndSize(NULL, output_size);
    379     if (rval == NULL) {
    380         return NULL;
    381     }
    382     output = PyString_AS_STRING(rval);
    383     output[0] = '"';
    384 
    385     /* We know that everything up to i is ASCII already */
    386     chars = i + 1;
    387     memcpy(&output[1], input_str, i);
    388 
    389     for (; i < input_chars; i++) {
    390         Py_UNICODE c = (Py_UNICODE)(unsigned char)input_str[i];
    391         if (S_CHAR(c)) {
    392             output[chars++] = (char)c;
    393         }
    394         else {
    395             chars = ascii_escape_char(c, output, chars);
    396         }
    397         /* An ASCII char can't possibly expand to a surrogate! */
    398         if (output_size - chars < (1 + MIN_EXPANSION)) {
    399             /* There's more than four, so let's resize by a lot */
    400             output_size *= 2;
    401             if (output_size > 2 + (input_chars * MIN_EXPANSION)) {
    402                 output_size = 2 + (input_chars * MIN_EXPANSION);
    403             }
    404             if (_PyString_Resize(&rval, output_size) == -1) {
    405                 return NULL;
    406             }
    407             output = PyString_AS_STRING(rval);
    408         }
    409     }
    410     output[chars++] = '"';
    411     if (_PyString_Resize(&rval, chars) == -1) {
    412         return NULL;
    413     }
    414     return rval;
    415 }
    416 
    417 static void
    418 raise_errmsg(char *msg, PyObject *s, Py_ssize_t end)
    419 {
    420     /* Use the Python function simplejson.decoder.errmsg to raise a nice
    421     looking ValueError exception */
    422     static PyObject *JSONDecodeError = NULL;
    423     PyObject *exc;
    424     if (JSONDecodeError == NULL) {
    425         PyObject *decoder = PyImport_ImportModule("simplejson.decoder");
    426         if (decoder == NULL)
    427             return;
    428         JSONDecodeError = PyObject_GetAttrString(decoder, "JSONDecodeError");
    429         Py_DECREF(decoder);
    430         if (JSONDecodeError == NULL)
    431             return;
    432     }
    433     exc = PyObject_CallFunction(JSONDecodeError, "(zOO&)", msg, s, _convertPyInt_FromSsize_t, &end);
    434     if (exc) {
    435         PyErr_SetObject(JSONDecodeError, exc);
    436         Py_DECREF(exc);
    437     }
    438 }
    439 
    440 static PyObject *
    441 join_list_unicode(PyObject *lst)
    442 {
    443     /* return u''.join(lst) */
    444     static PyObject *joinfn = NULL;
    445     if (joinfn == NULL) {
    446         PyObject *ustr = PyUnicode_FromUnicode(NULL, 0);
    447         if (ustr == NULL)
    448             return NULL;
    449 
    450         joinfn = PyObject_GetAttrString(ustr, "join");
    451         Py_DECREF(ustr);
    452         if (joinfn == NULL)
    453             return NULL;
    454     }
    455     return PyObject_CallFunctionObjArgs(joinfn, lst, NULL);
    456 }
    457 
    458 static PyObject *
    459 join_list_string(PyObject *lst)
    460 {
    461     /* return ''.join(lst) */
    462     static PyObject *joinfn = NULL;
    463     if (joinfn == NULL) {
    464         PyObject *ustr = PyString_FromStringAndSize(NULL, 0);
    465         if (ustr == NULL)
    466             return NULL;
    467 
    468         joinfn = PyObject_GetAttrString(ustr, "join");
    469         Py_DECREF(ustr);
    470         if (joinfn == NULL)
    471             return NULL;
    472     }
    473     return PyObject_CallFunctionObjArgs(joinfn, lst, NULL);
    474 }
    475 
    476 static PyObject *
    477 _build_rval_index_tuple(PyObject *rval, Py_ssize_t idx) {
    478     /* return (rval, idx) tuple, stealing reference to rval */
    479     PyObject *tpl;
    480     PyObject *pyidx;
    481     /*
    482     steal a reference to rval, returns (rval, idx)
    483     */
    484     if (rval == NULL) {
    485         return NULL;
    486     }
    487     pyidx = PyInt_FromSsize_t(idx);
    488     if (pyidx == NULL) {
    489         Py_DECREF(rval);
    490         return NULL;
    491     }
    492     tpl = PyTuple_New(2);
    493     if (tpl == NULL) {
    494         Py_DECREF(pyidx);
    495         Py_DECREF(rval);
    496         return NULL;
    497     }
    498     PyTuple_SET_ITEM(tpl, 0, rval);
    499     PyTuple_SET_ITEM(tpl, 1, pyidx);
    500     return tpl;
    501 }
    502 
    503 #define APPEND_OLD_CHUNK \
    504     if (chunk != NULL) { \
    505         if (chunks == NULL) { \
    506             chunks = PyList_New(0); \
    507             if (chunks == NULL) { \
    508                 goto bail; \
    509             } \
    510         } \
    511         if (PyList_Append(chunks, chunk)) { \
    512             goto bail; \
    513         } \
    514         Py_CLEAR(chunk); \
    515     }
    516 
    517 static PyObject *
    518 scanstring_str(PyObject *pystr, Py_ssize_t end, char *encoding, int strict, Py_ssize_t *next_end_ptr)
    519 {
    520     /* Read the JSON string from PyString pystr.
    521     end is the index of the first character after the quote.
    522     encoding is the encoding of pystr (must be an ASCII superset)
    523     if strict is zero then literal control characters are allowed
    524     *next_end_ptr is a return-by-reference index of the character
    525         after the end quote
    526 
    527     Return value is a new PyString (if ASCII-only) or PyUnicode
    528     */
    529     PyObject *rval;
    530     Py_ssize_t len = PyString_GET_SIZE(pystr);
    531     Py_ssize_t begin = end - 1;
    532     Py_ssize_t next = begin;
    533     int has_unicode = 0;
    534     char *buf = PyString_AS_STRING(pystr);
    535     PyObject *chunks = NULL;
    536     PyObject *chunk = NULL;
    537 
    538     if (len == end) {
    539         raise_errmsg("Unterminated string starting at", pystr, begin);
    540     }
    541     else if (end < 0 || len < end) {
    542         PyErr_SetString(PyExc_ValueError, "end is out of bounds");
    543         goto bail;
    544     }
    545     while (1) {
    546         /* Find the end of the string or the next escape */
    547         Py_UNICODE c = 0;
    548         for (next = end; next < len; next++) {
    549             c = (unsigned char)buf[next];
    550             if (c == '"' || c == '\\') {
    551                 break;
    552             }
    553             else if (strict && c <= 0x1f) {
    554                 raise_errmsg("Invalid control character at", pystr, next);
    555                 goto bail;
    556             }
    557             else if (c > 0x7f) {
    558                 has_unicode = 1;
    559             }
    560         }
    561         if (!(c == '"' || c == '\\')) {
    562             raise_errmsg("Unterminated string starting at", pystr, begin);
    563             goto bail;
    564         }
    565         /* Pick up this chunk if it's not zero length */
    566         if (next != end) {
    567             PyObject *strchunk;
    568             APPEND_OLD_CHUNK
    569             strchunk = PyString_FromStringAndSize(&buf[end], next - end);
    570             if (strchunk == NULL) {
    571                 goto bail;
    572             }
    573             if (has_unicode) {
    574                 chunk = PyUnicode_FromEncodedObject(strchunk, encoding, NULL);
    575                 Py_DECREF(strchunk);
    576                 if (chunk == NULL) {
    577                     goto bail;
    578                 }
    579             }
    580             else {
    581                 chunk = strchunk;
    582             }
    583         }
    584         next++;
    585         if (c == '"') {
    586             end = next;
    587             break;
    588         }
    589         if (next == len) {
    590             raise_errmsg("Unterminated string starting at", pystr, begin);
    591             goto bail;
    592         }
    593         c = buf[next];
    594         if (c != 'u') {
    595             /* Non-unicode backslash escapes */
    596             end = next + 1;
    597             switch (c) {
    598                 case '"': break;
    599                 case '\\': break;
    600                 case '/': break;
    601                 case 'b': c = '\b'; break;
    602                 case 'f': c = '\f'; break;
    603                 case 'n': c = '\n'; break;
    604                 case 'r': c = '\r'; break;
    605                 case 't': c = '\t'; break;
    606                 default: c = 0;
    607             }
    608             if (c == 0) {
    609                 raise_errmsg("Invalid \\escape", pystr, end - 2);
    610                 goto bail;
    611             }
    612         }
    613         else {
    614             c = 0;
    615             next++;
    616             end = next + 4;
    617             if (end >= len) {
    618                 raise_errmsg("Invalid \\uXXXX escape", pystr, next - 1);
    619                 goto bail;
    620             }
    621             /* Decode 4 hex digits */
    622             for (; next < end; next++) {
    623                 Py_UNICODE digit = buf[next];
    624                 c <<= 4;
    625                 switch (digit) {
    626                     case '0': case '1': case '2': case '3': case '4':
    627                     case '5': case '6': case '7': case '8': case '9':
    628                         c |= (digit - '0'); break;
    629                     case 'a': case 'b': case 'c': case 'd': case 'e':
    630                     case 'f':
    631                         c |= (digit - 'a' + 10); break;
    632                     case 'A': case 'B': case 'C': case 'D': case 'E':
    633                     case 'F':
    634                         c |= (digit - 'A' + 10); break;
    635                     default:
    636                         raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
    637                         goto bail;
    638                 }
    639             }
    640 #ifdef Py_UNICODE_WIDE
    641             /* Surrogate pair */
    642             if ((c & 0xfc00) == 0xd800) {
    643                 Py_UNICODE c2 = 0;
    644                 if (end + 6 >= len) {
    645                     raise_errmsg("Unpaired high surrogate", pystr, end - 5);
    646                     goto bail;
    647                 }
    648                 if (buf[next++] != '\\' || buf[next++] != 'u') {
    649                     raise_errmsg("Unpaired high surrogate", pystr, end - 5);
    650                     goto bail;
    651                 }
    652                 end += 6;
    653                 /* Decode 4 hex digits */
    654                 for (; next < end; next++) {
    655                     c2 <<= 4;
    656                     Py_UNICODE digit = buf[next];
    657                     switch (digit) {
    658                         case '0': case '1': case '2': case '3': case '4':
    659                         case '5': case '6': case '7': case '8': case '9':
    660                             c2 |= (digit - '0'); break;
    661                         case 'a': case 'b': case 'c': case 'd': case 'e':
    662                         case 'f':
    663                             c2 |= (digit - 'a' + 10); break;
    664                         case 'A': case 'B': case 'C': case 'D': case 'E':
    665                         case 'F':
    666                             c2 |= (digit - 'A' + 10); break;
    667                         default:
    668                             raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
    669                             goto bail;
    670                     }
    671                 }
    672                 if ((c2 & 0xfc00) != 0xdc00) {
    673                     raise_errmsg("Unpaired high surrogate", pystr, end - 5);
    674                     goto bail;
    675                 }
    676                 c = 0x10000 + (((c - 0xd800) << 10) | (c2 - 0xdc00));
    677             }
    678             else if ((c & 0xfc00) == 0xdc00) {
    679                 raise_errmsg("Unpaired low surrogate", pystr, end - 5);
    680                 goto bail;
    681             }
    682 #endif
    683         }
    684         if (c > 0x7f) {
    685             has_unicode = 1;
    686         }
    687         APPEND_OLD_CHUNK
    688         if (has_unicode) {
    689             chunk = PyUnicode_FromUnicode(&c, 1);
    690             if (chunk == NULL) {
    691                 goto bail;
    692             }
    693         }
    694         else {
    695             char c_char = Py_CHARMASK(c);
    696             chunk = PyString_FromStringAndSize(&c_char, 1);
    697             if (chunk == NULL) {
    698                 goto bail;
    699             }
    700         }
    701     }
    702 
    703     if (chunks == NULL) {
    704         if (chunk != NULL)
    705             rval = chunk;
    706         else
    707             rval = PyString_FromStringAndSize("", 0);
    708     }
    709     else {
    710         APPEND_OLD_CHUNK
    711         rval = join_list_string(chunks);
    712         if (rval == NULL) {
    713             goto bail;
    714         }
    715         Py_CLEAR(chunks);
    716     }
    717 
    718     *next_end_ptr = end;
    719     return rval;
    720 bail:
    721     *next_end_ptr = -1;
    722     Py_XDECREF(chunk);
    723     Py_XDECREF(chunks);
    724     return NULL;
    725 }
    726 
    727 
    728 static PyObject *
    729 scanstring_unicode(PyObject *pystr, Py_ssize_t end, int strict, Py_ssize_t *next_end_ptr)
    730 {
    731     /* Read the JSON string from PyUnicode pystr.
    732     end is the index of the first character after the quote.
    733     if strict is zero then literal control characters are allowed
    734     *next_end_ptr is a return-by-reference index of the character
    735         after the end quote
    736 
    737     Return value is a new PyUnicode
    738     */
    739     PyObject *rval;
    740     Py_ssize_t len = PyUnicode_GET_SIZE(pystr);
    741     Py_ssize_t begin = end - 1;
    742     Py_ssize_t next = begin;
    743     const Py_UNICODE *buf = PyUnicode_AS_UNICODE(pystr);
    744     PyObject *chunks = NULL;
    745     PyObject *chunk = NULL;
    746 
    747     if (len == end) {
    748         raise_errmsg("Unterminated string starting at", pystr, begin);
    749     }
    750     else if (end < 0 || len < end) {
    751         PyErr_SetString(PyExc_ValueError, "end is out of bounds");
    752         goto bail;
    753     }
    754     while (1) {
    755         /* Find the end of the string or the next escape */
    756         Py_UNICODE c = 0;
    757         for (next = end; next < len; next++) {
    758             c = buf[next];
    759             if (c == '"' || c == '\\') {
    760                 break;
    761             }
    762             else if (strict && c <= 0x1f) {
    763                 raise_errmsg("Invalid control character at", pystr, next);
    764                 goto bail;
    765             }
    766         }
    767         if (!(c == '"' || c == '\\')) {
    768             raise_errmsg("Unterminated string starting at", pystr, begin);
    769             goto bail;
    770         }
    771         /* Pick up this chunk if it's not zero length */
    772         if (next != end) {
    773             APPEND_OLD_CHUNK
    774             chunk = PyUnicode_FromUnicode(&buf[end], next - end);
    775             if (chunk == NULL) {
    776                 goto bail;
    777             }
    778         }
    779         next++;
    780         if (c == '"') {
    781             end = next;
    782             break;
    783         }
    784         if (next == len) {
    785             raise_errmsg("Unterminated string starting at", pystr, begin);
    786             goto bail;
    787         }
    788         c = buf[next];
    789         if (c != 'u') {
    790             /* Non-unicode backslash escapes */
    791             end = next + 1;
    792             switch (c) {
    793                 case '"': break;
    794                 case '\\': break;
    795                 case '/': break;
    796                 case 'b': c = '\b'; break;
    797                 case 'f': c = '\f'; break;
    798                 case 'n': c = '\n'; break;
    799                 case 'r': c = '\r'; break;
    800                 case 't': c = '\t'; break;
    801                 default: c = 0;
    802             }
    803             if (c == 0) {
    804                 raise_errmsg("Invalid \\escape", pystr, end - 2);
    805                 goto bail;
    806             }
    807         }
    808         else {
    809             c = 0;
    810             next++;
    811             end = next + 4;
    812             if (end >= len) {
    813                 raise_errmsg("Invalid \\uXXXX escape", pystr, next - 1);
    814                 goto bail;
    815             }
    816             /* Decode 4 hex digits */
    817             for (; next < end; next++) {
    818                 Py_UNICODE digit = buf[next];
    819                 c <<= 4;
    820                 switch (digit) {
    821                     case '0': case '1': case '2': case '3': case '4':
    822                     case '5': case '6': case '7': case '8': case '9':
    823                         c |= (digit - '0'); break;
    824                     case 'a': case 'b': case 'c': case 'd': case 'e':
    825                     case 'f':
    826                         c |= (digit - 'a' + 10); break;
    827                     case 'A': case 'B': case 'C': case 'D': case 'E':
    828                     case 'F':
    829                         c |= (digit - 'A' + 10); break;
    830                     default:
    831                         raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
    832                         goto bail;
    833                 }
    834             }
    835 #ifdef Py_UNICODE_WIDE
    836             /* Surrogate pair */
    837             if ((c & 0xfc00) == 0xd800) {
    838                 Py_UNICODE c2 = 0;
    839                 if (end + 6 >= len) {
    840                     raise_errmsg("Unpaired high surrogate", pystr, end - 5);
    841                     goto bail;
    842                 }
    843                 if (buf[next++] != '\\' || buf[next++] != 'u') {
    844                     raise_errmsg("Unpaired high surrogate", pystr, end - 5);
    845                     goto bail;
    846                 }
    847                 end += 6;
    848                 /* Decode 4 hex digits */
    849                 for (; next < end; next++) {
    850                     c2 <<= 4;
    851                     Py_UNICODE digit = buf[next];
    852                     switch (digit) {
    853                         case '0': case '1': case '2': case '3': case '4':
    854                         case '5': case '6': case '7': case '8': case '9':
    855                             c2 |= (digit - '0'); break;
    856                         case 'a': case 'b': case 'c': case 'd': case 'e':
    857                         case 'f':
    858                             c2 |= (digit - 'a' + 10); break;
    859                         case 'A': case 'B': case 'C': case 'D': case 'E':
    860                         case 'F':
    861                             c2 |= (digit - 'A' + 10); break;
    862                         default:
    863                             raise_errmsg("Invalid \\uXXXX escape", pystr, end - 5);
    864                             goto bail;
    865                     }
    866                 }
    867                 if ((c2 & 0xfc00) != 0xdc00) {
    868                     raise_errmsg("Unpaired high surrogate", pystr, end - 5);
    869                     goto bail;
    870                 }
    871                 c = 0x10000 + (((c - 0xd800) << 10) | (c2 - 0xdc00));
    872             }
    873             else if ((c & 0xfc00) == 0xdc00) {
    874                 raise_errmsg("Unpaired low surrogate", pystr, end - 5);
    875                 goto bail;
    876             }
    877 #endif
    878         }
    879         APPEND_OLD_CHUNK
    880         chunk = PyUnicode_FromUnicode(&c, 1);
    881         if (chunk == NULL) {
    882             goto bail;
    883         }
    884     }
    885 
    886     if (chunks == NULL) {
    887         if (chunk != NULL)
    888             rval = chunk;
    889         else
    890             rval = PyUnicode_FromUnicode(NULL, 0);
    891     }
    892     else {
    893         APPEND_OLD_CHUNK
    894         rval = join_list_unicode(chunks);
    895         if (rval == NULL) {
    896             goto bail;
    897         }
    898         Py_CLEAR(chunks);
    899     }
    900     *next_end_ptr = end;
    901     return rval;
    902 bail:
    903     *next_end_ptr = -1;
    904     Py_XDECREF(chunk);
    905     Py_XDECREF(chunks);
    906     return NULL;
    907 }
    908 
    909 PyDoc_STRVAR(pydoc_scanstring,
    910     "scanstring(basestring, end, encoding, strict=True) -> (str, end)\n"
    911     "\n"
    912     "Scan the string s for a JSON string. End is the index of the\n"
    913     "character in s after the quote that started the JSON string.\n"
    914     "Unescapes all valid JSON string escape sequences and raises ValueError\n"
    915     "on attempt to decode an invalid string. If strict is False then literal\n"
    916     "control characters are allowed in the string.\n"
    917     "\n"
    918     "Returns a tuple of the decoded string and the index of the character in s\n"
    919     "after the end quote."
    920 );
    921 
    922 static PyObject *
    923 py_scanstring(PyObject* self UNUSED, PyObject *args)
    924 {
    925     PyObject *pystr;
    926     PyObject *rval;
    927     Py_ssize_t end;
    928     Py_ssize_t next_end = -1;
    929     char *encoding = NULL;
    930     int strict = 1;
    931     if (!PyArg_ParseTuple(args, "OO&|zi:scanstring", &pystr, _convertPyInt_AsSsize_t, &end, &encoding, &strict)) {
    932         return NULL;
    933     }
    934     if (encoding == NULL) {
    935         encoding = DEFAULT_ENCODING;
    936     }
    937     if (PyString_Check(pystr)) {
    938         rval = scanstring_str(pystr, end, encoding, strict, &next_end);
    939     }
    940     else if (PyUnicode_Check(pystr)) {
    941         rval = scanstring_unicode(pystr, end, strict, &next_end);
    942     }
    943     else {
    944         PyErr_Format(PyExc_TypeError,
    945                      "first argument must be a string, not %.80s",
    946                      Py_TYPE(pystr)->tp_name);
    947         return NULL;
    948     }
    949     return _build_rval_index_tuple(rval, next_end);
    950 }
    951 
    952 PyDoc_STRVAR(pydoc_encode_basestring_ascii,
    953     "encode_basestring_ascii(basestring) -> str\n"
    954     "\n"
    955     "Return an ASCII-only JSON representation of a Python string"
    956 );
    957 
    958 static PyObject *
    959 py_encode_basestring_ascii(PyObject* self UNUSED, PyObject *pystr)
    960 {
    961     /* Return an ASCII-only JSON representation of a Python string */
    962     /* METH_O */
    963     if (PyString_Check(pystr)) {
    964         return ascii_escape_str(pystr);
    965     }
    966     else if (PyUnicode_Check(pystr)) {
    967         return ascii_escape_unicode(pystr);
    968     }
    969     else {
    970         PyErr_Format(PyExc_TypeError,
    971                      "first argument must be a string, not %.80s",
    972                      Py_TYPE(pystr)->tp_name);
    973         return NULL;
    974     }
    975 }
    976 
    977 static void
    978 scanner_dealloc(PyObject *self)
    979 {
    980     /* Deallocate scanner object */
    981     scanner_clear(self);
    982     Py_TYPE(self)->tp_free(self);
    983 }
    984 
    985 static int
    986 scanner_traverse(PyObject *self, visitproc visit, void *arg)
    987 {
    988     PyScannerObject *s;
    989     assert(PyScanner_Check(self));
    990     s = (PyScannerObject *)self;
    991     Py_VISIT(s->encoding);
    992     Py_VISIT(s->strict);
    993     Py_VISIT(s->object_hook);
    994     Py_VISIT(s->pairs_hook);
    995     Py_VISIT(s->parse_float);
    996     Py_VISIT(s->parse_int);
    997     Py_VISIT(s->parse_constant);
    998     Py_VISIT(s->memo);
    999     return 0;
   1000 }
   1001 
   1002 static int
   1003 scanner_clear(PyObject *self)
   1004 {
   1005     PyScannerObject *s;
   1006     assert(PyScanner_Check(self));
   1007     s = (PyScannerObject *)self;
   1008     Py_CLEAR(s->encoding);
   1009     Py_CLEAR(s->strict);
   1010     Py_CLEAR(s->object_hook);
   1011     Py_CLEAR(s->pairs_hook);
   1012     Py_CLEAR(s->parse_float);
   1013     Py_CLEAR(s->parse_int);
   1014     Py_CLEAR(s->parse_constant);
   1015     Py_CLEAR(s->memo);
   1016     return 0;
   1017 }
   1018 
   1019 static PyObject *
   1020 _parse_object_str(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *next_idx_ptr) {
   1021     /* Read a JSON object from PyString pystr.
   1022     idx is the index of the first character after the opening curly brace.
   1023     *next_idx_ptr is a return-by-reference index to the first character after
   1024         the closing curly brace.
   1025 
   1026     Returns a new PyObject (usually a dict, but object_hook or
   1027     object_pairs_hook can change that)
   1028     */
   1029     char *str = PyString_AS_STRING(pystr);
   1030     Py_ssize_t end_idx = PyString_GET_SIZE(pystr) - 1;
   1031     PyObject *rval = NULL;
   1032     PyObject *pairs = NULL;
   1033     PyObject *item;
   1034     PyObject *key = NULL;
   1035     PyObject *val = NULL;
   1036     char *encoding = PyString_AS_STRING(s->encoding);
   1037     int strict = PyObject_IsTrue(s->strict);
   1038     int has_pairs_hook = (s->pairs_hook != Py_None);
   1039     Py_ssize_t next_idx;
   1040     if (has_pairs_hook) {
   1041         pairs = PyList_New(0);
   1042         if (pairs == NULL)
   1043             return NULL;
   1044     }
   1045     else {
   1046         rval = PyDict_New();
   1047         if (rval == NULL)
   1048             return NULL;
   1049     }
   1050 
   1051     /* skip whitespace after { */
   1052     while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1053 
   1054     /* only loop if the object is non-empty */
   1055     if (idx <= end_idx && str[idx] != '}') {
   1056         while (idx <= end_idx) {
   1057             PyObject *memokey;
   1058 
   1059             /* read key */
   1060             if (str[idx] != '"') {
   1061                 raise_errmsg(
   1062                     "Expecting property name enclosed in double quotes",
   1063                     pystr, idx);
   1064                 goto bail;
   1065             }
   1066             key = scanstring_str(pystr, idx + 1, encoding, strict, &next_idx);
   1067             if (key == NULL)
   1068                 goto bail;
   1069             memokey = PyDict_GetItem(s->memo, key);
   1070             if (memokey != NULL) {
   1071                 Py_INCREF(memokey);
   1072                 Py_DECREF(key);
   1073                 key = memokey;
   1074             }
   1075             else {
   1076                 if (PyDict_SetItem(s->memo, key, key) < 0)
   1077                     goto bail;
   1078             }
   1079             idx = next_idx;
   1080 
   1081             /* skip whitespace between key and : delimiter, read :, skip whitespace */
   1082             while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1083             if (idx > end_idx || str[idx] != ':') {
   1084                 raise_errmsg("Expecting ':' delimiter", pystr, idx);
   1085                 goto bail;
   1086             }
   1087             idx++;
   1088             while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1089 
   1090             /* read any JSON data type */
   1091             val = scan_once_str(s, pystr, idx, &next_idx);
   1092             if (val == NULL)
   1093                 goto bail;
   1094 
   1095             if (has_pairs_hook) {
   1096                 item = PyTuple_Pack(2, key, val);
   1097                 if (item == NULL)
   1098                     goto bail;
   1099                 Py_CLEAR(key);
   1100                 Py_CLEAR(val);
   1101                 if (PyList_Append(pairs, item) == -1) {
   1102                     Py_DECREF(item);
   1103                     goto bail;
   1104                 }
   1105                 Py_DECREF(item);
   1106             }
   1107             else {
   1108                 if (PyDict_SetItem(rval, key, val) < 0)
   1109                     goto bail;
   1110                 Py_CLEAR(key);
   1111                 Py_CLEAR(val);
   1112             }
   1113             idx = next_idx;
   1114 
   1115             /* skip whitespace before } or , */
   1116             while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1117 
   1118             /* bail if the object is closed or we didn't get the , delimiter */
   1119             if (idx > end_idx) break;
   1120             if (str[idx] == '}') {
   1121                 break;
   1122             }
   1123             else if (str[idx] != ',') {
   1124                 raise_errmsg("Expecting ',' delimiter", pystr, idx);
   1125                 goto bail;
   1126             }
   1127             idx++;
   1128 
   1129             /* skip whitespace after , delimiter */
   1130             while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1131         }
   1132     }
   1133     /* verify that idx < end_idx, str[idx] should be '}' */
   1134     if (idx > end_idx || str[idx] != '}') {
   1135         raise_errmsg("Expecting object", pystr, end_idx);
   1136         goto bail;
   1137     }
   1138 
   1139     /* if pairs_hook is not None: rval = object_pairs_hook(pairs) */
   1140     if (s->pairs_hook != Py_None) {
   1141         val = PyObject_CallFunctionObjArgs(s->pairs_hook, pairs, NULL);
   1142         if (val == NULL)
   1143             goto bail;
   1144         Py_DECREF(pairs);
   1145         *next_idx_ptr = idx + 1;
   1146         return val;
   1147     }
   1148 
   1149     /* if object_hook is not None: rval = object_hook(rval) */
   1150     if (s->object_hook != Py_None) {
   1151         val = PyObject_CallFunctionObjArgs(s->object_hook, rval, NULL);
   1152         if (val == NULL)
   1153             goto bail;
   1154         Py_DECREF(rval);
   1155         rval = val;
   1156         val = NULL;
   1157     }
   1158     *next_idx_ptr = idx + 1;
   1159     return rval;
   1160 bail:
   1161     Py_XDECREF(rval);
   1162     Py_XDECREF(key);
   1163     Py_XDECREF(val);
   1164     Py_XDECREF(pairs);
   1165     return NULL;
   1166 }
   1167 
   1168 static PyObject *
   1169 _parse_object_unicode(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *next_idx_ptr) {
   1170     /* Read a JSON object from PyUnicode pystr.
   1171     idx is the index of the first character after the opening curly brace.
   1172     *next_idx_ptr is a return-by-reference index to the first character after
   1173         the closing curly brace.
   1174 
   1175     Returns a new PyObject (usually a dict, but object_hook can change that)
   1176     */
   1177     Py_UNICODE *str = PyUnicode_AS_UNICODE(pystr);
   1178     Py_ssize_t end_idx = PyUnicode_GET_SIZE(pystr) - 1;
   1179     PyObject *rval = NULL;
   1180     PyObject *pairs = NULL;
   1181     PyObject *item;
   1182     PyObject *key = NULL;
   1183     PyObject *val = NULL;
   1184     int strict = PyObject_IsTrue(s->strict);
   1185     int has_pairs_hook = (s->pairs_hook != Py_None);
   1186     Py_ssize_t next_idx;
   1187 
   1188     if (has_pairs_hook) {
   1189         pairs = PyList_New(0);
   1190         if (pairs == NULL)
   1191             return NULL;
   1192     }
   1193     else {
   1194         rval = PyDict_New();
   1195         if (rval == NULL)
   1196             return NULL;
   1197     }
   1198 
   1199     /* skip whitespace after { */
   1200     while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1201 
   1202     /* only loop if the object is non-empty */
   1203     if (idx <= end_idx && str[idx] != '}') {
   1204         while (idx <= end_idx) {
   1205             PyObject *memokey;
   1206 
   1207             /* read key */
   1208             if (str[idx] != '"') {
   1209                 raise_errmsg(
   1210                     "Expecting property name enclosed in double quotes",
   1211                     pystr, idx);
   1212                 goto bail;
   1213             }
   1214             key = scanstring_unicode(pystr, idx + 1, strict, &next_idx);
   1215             if (key == NULL)
   1216                 goto bail;
   1217             memokey = PyDict_GetItem(s->memo, key);
   1218             if (memokey != NULL) {
   1219                 Py_INCREF(memokey);
   1220                 Py_DECREF(key);
   1221                 key = memokey;
   1222             }
   1223             else {
   1224                 if (PyDict_SetItem(s->memo, key, key) < 0)
   1225                     goto bail;
   1226             }
   1227             idx = next_idx;
   1228 
   1229             /* skip whitespace between key and : delimiter, read :, skip
   1230                whitespace */
   1231             while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1232             if (idx > end_idx || str[idx] != ':') {
   1233                 raise_errmsg("Expecting ':' delimiter", pystr, idx);
   1234                 goto bail;
   1235             }
   1236             idx++;
   1237             while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1238 
   1239             /* read any JSON term */
   1240             val = scan_once_unicode(s, pystr, idx, &next_idx);
   1241             if (val == NULL)
   1242                 goto bail;
   1243 
   1244             if (has_pairs_hook) {
   1245                 item = PyTuple_Pack(2, key, val);
   1246                 if (item == NULL)
   1247                     goto bail;
   1248                 Py_CLEAR(key);
   1249                 Py_CLEAR(val);
   1250                 if (PyList_Append(pairs, item) == -1) {
   1251                     Py_DECREF(item);
   1252                     goto bail;
   1253                 }
   1254                 Py_DECREF(item);
   1255             }
   1256             else {
   1257                 if (PyDict_SetItem(rval, key, val) < 0)
   1258                     goto bail;
   1259                 Py_CLEAR(key);
   1260                 Py_CLEAR(val);
   1261             }
   1262             idx = next_idx;
   1263 
   1264             /* skip whitespace before } or , */
   1265             while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1266 
   1267             /* bail if the object is closed or we didn't get the ,
   1268                delimiter */
   1269             if (idx > end_idx) break;
   1270             if (str[idx] == '}') {
   1271                 break;
   1272             }
   1273             else if (str[idx] != ',') {
   1274                 raise_errmsg("Expecting ',' delimiter", pystr, idx);
   1275                 goto bail;
   1276             }
   1277             idx++;
   1278 
   1279             /* skip whitespace after , delimiter */
   1280             while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1281         }
   1282     }
   1283 
   1284     /* verify that idx < end_idx, str[idx] should be '}' */
   1285     if (idx > end_idx || str[idx] != '}') {
   1286         raise_errmsg("Expecting object", pystr, end_idx);
   1287         goto bail;
   1288     }
   1289 
   1290     /* if pairs_hook is not None: rval = object_pairs_hook(pairs) */
   1291     if (s->pairs_hook != Py_None) {
   1292         val = PyObject_CallFunctionObjArgs(s->pairs_hook, pairs, NULL);
   1293         if (val == NULL)
   1294             goto bail;
   1295         Py_DECREF(pairs);
   1296         *next_idx_ptr = idx + 1;
   1297         return val;
   1298     }
   1299 
   1300     /* if object_hook is not None: rval = object_hook(rval) */
   1301     if (s->object_hook != Py_None) {
   1302         val = PyObject_CallFunctionObjArgs(s->object_hook, rval, NULL);
   1303         if (val == NULL)
   1304             goto bail;
   1305         Py_DECREF(rval);
   1306         rval = val;
   1307         val = NULL;
   1308     }
   1309     *next_idx_ptr = idx + 1;
   1310     return rval;
   1311 bail:
   1312     Py_XDECREF(rval);
   1313     Py_XDECREF(key);
   1314     Py_XDECREF(val);
   1315     Py_XDECREF(pairs);
   1316     return NULL;
   1317 }
   1318 
   1319 static PyObject *
   1320 _parse_array_str(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *next_idx_ptr) {
   1321     /* Read a JSON array from PyString pystr.
   1322     idx is the index of the first character after the opening brace.
   1323     *next_idx_ptr is a return-by-reference index to the first character after
   1324         the closing brace.
   1325 
   1326     Returns a new PyList
   1327     */
   1328     char *str = PyString_AS_STRING(pystr);
   1329     Py_ssize_t end_idx = PyString_GET_SIZE(pystr) - 1;
   1330     PyObject *val = NULL;
   1331     PyObject *rval = PyList_New(0);
   1332     Py_ssize_t next_idx;
   1333     if (rval == NULL)
   1334         return NULL;
   1335 
   1336     /* skip whitespace after [ */
   1337     while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1338 
   1339     /* only loop if the array is non-empty */
   1340     if (idx <= end_idx && str[idx] != ']') {
   1341         while (idx <= end_idx) {
   1342 
   1343             /* read any JSON term and de-tuplefy the (rval, idx) */
   1344             val = scan_once_str(s, pystr, idx, &next_idx);
   1345             if (val == NULL) {
   1346                 if (PyErr_ExceptionMatches(PyExc_StopIteration)) {
   1347                     PyErr_Clear();
   1348                     raise_errmsg("Expecting object", pystr, idx);
   1349                 }
   1350                 goto bail;
   1351             }
   1352 
   1353             if (PyList_Append(rval, val) == -1)
   1354                 goto bail;
   1355 
   1356             Py_CLEAR(val);
   1357             idx = next_idx;
   1358 
   1359             /* skip whitespace between term and , */
   1360             while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1361 
   1362             /* bail if the array is closed or we didn't get the , delimiter */
   1363             if (idx > end_idx) break;
   1364             if (str[idx] == ']') {
   1365                 break;
   1366             }
   1367             else if (str[idx] != ',') {
   1368                 raise_errmsg("Expecting ',' delimiter", pystr, idx);
   1369                 goto bail;
   1370             }
   1371             idx++;
   1372 
   1373             /* skip whitespace after , */
   1374             while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1375         }
   1376     }
   1377 
   1378     /* verify that idx < end_idx, str[idx] should be ']' */
   1379     if (idx > end_idx || str[idx] != ']') {
   1380         raise_errmsg("Expecting object", pystr, end_idx);
   1381         goto bail;
   1382     }
   1383     *next_idx_ptr = idx + 1;
   1384     return rval;
   1385 bail:
   1386     Py_XDECREF(val);
   1387     Py_DECREF(rval);
   1388     return NULL;
   1389 }
   1390 
   1391 static PyObject *
   1392 _parse_array_unicode(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *next_idx_ptr) {
   1393     /* Read a JSON array from PyString pystr.
   1394     idx is the index of the first character after the opening brace.
   1395     *next_idx_ptr is a return-by-reference index to the first character after
   1396         the closing brace.
   1397 
   1398     Returns a new PyList
   1399     */
   1400     Py_UNICODE *str = PyUnicode_AS_UNICODE(pystr);
   1401     Py_ssize_t end_idx = PyUnicode_GET_SIZE(pystr) - 1;
   1402     PyObject *val = NULL;
   1403     PyObject *rval = PyList_New(0);
   1404     Py_ssize_t next_idx;
   1405     if (rval == NULL)
   1406         return NULL;
   1407 
   1408     /* skip whitespace after [ */
   1409     while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1410 
   1411     /* only loop if the array is non-empty */
   1412     if (idx <= end_idx && str[idx] != ']') {
   1413         while (idx <= end_idx) {
   1414 
   1415             /* read any JSON term  */
   1416             val = scan_once_unicode(s, pystr, idx, &next_idx);
   1417             if (val == NULL) {
   1418                 if (PyErr_ExceptionMatches(PyExc_StopIteration)) {
   1419                     PyErr_Clear();
   1420                     raise_errmsg("Expecting object", pystr, idx);
   1421                 }
   1422                 goto bail;
   1423             }
   1424 
   1425             if (PyList_Append(rval, val) == -1)
   1426                 goto bail;
   1427 
   1428             Py_CLEAR(val);
   1429             idx = next_idx;
   1430 
   1431             /* skip whitespace between term and , */
   1432             while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1433 
   1434             /* bail if the array is closed or we didn't get the , delimiter */
   1435             if (idx > end_idx) break;
   1436             if (str[idx] == ']') {
   1437                 break;
   1438             }
   1439             else if (str[idx] != ',') {
   1440                 raise_errmsg("Expecting ',' delimiter", pystr, idx);
   1441                 goto bail;
   1442             }
   1443             idx++;
   1444 
   1445             /* skip whitespace after , */
   1446             while (idx <= end_idx && IS_WHITESPACE(str[idx])) idx++;
   1447         }
   1448     }
   1449 
   1450     /* verify that idx < end_idx, str[idx] should be ']' */
   1451     if (idx > end_idx || str[idx] != ']') {
   1452         raise_errmsg("Expecting object", pystr, end_idx);
   1453         goto bail;
   1454     }
   1455     *next_idx_ptr = idx + 1;
   1456     return rval;
   1457 bail:
   1458     Py_XDECREF(val);
   1459     Py_DECREF(rval);
   1460     return NULL;
   1461 }
   1462 
   1463 static PyObject *
   1464 _parse_constant(PyScannerObject *s, char *constant, Py_ssize_t idx, Py_ssize_t *next_idx_ptr) {
   1465     /* Read a JSON constant from PyString pystr.
   1466     constant is the constant string that was found
   1467         ("NaN", "Infinity", "-Infinity").
   1468     idx is the index of the first character of the constant
   1469     *next_idx_ptr is a return-by-reference index to the first character after
   1470         the constant.
   1471 
   1472     Returns the result of parse_constant
   1473     */
   1474     PyObject *cstr;
   1475     PyObject *rval;
   1476     /* constant is "NaN", "Infinity", or "-Infinity" */
   1477     cstr = PyString_InternFromString(constant);
   1478     if (cstr == NULL)
   1479         return NULL;
   1480 
   1481     /* rval = parse_constant(constant) */
   1482     rval = PyObject_CallFunctionObjArgs(s->parse_constant, cstr, NULL);
   1483     idx += PyString_GET_SIZE(cstr);
   1484     Py_DECREF(cstr);
   1485     *next_idx_ptr = idx;
   1486     return rval;
   1487 }
   1488 
   1489 static PyObject *
   1490 _match_number_str(PyScannerObject *s, PyObject *pystr, Py_ssize_t start, Py_ssize_t *next_idx_ptr) {
   1491     /* Read a JSON number from PyString pystr.
   1492     idx is the index of the first character of the number
   1493     *next_idx_ptr is a return-by-reference index to the first character after
   1494         the number.
   1495 
   1496     Returns a new PyObject representation of that number:
   1497         PyInt, PyLong, or PyFloat.
   1498         May return other types if parse_int or parse_float are set
   1499     */
   1500     char *str = PyString_AS_STRING(pystr);
   1501     Py_ssize_t end_idx = PyString_GET_SIZE(pystr) - 1;
   1502     Py_ssize_t idx = start;
   1503     int is_float = 0;
   1504     PyObject *rval;
   1505     PyObject *numstr;
   1506 
   1507     /* read a sign if it's there, make sure it's not the end of the string */
   1508     if (str[idx] == '-') {
   1509         idx++;
   1510         if (idx > end_idx) {
   1511             PyErr_SetNone(PyExc_StopIteration);
   1512             return NULL;
   1513         }
   1514     }
   1515 
   1516     /* read as many integer digits as we find as long as it doesn't start with 0 */
   1517     if (str[idx] >= '1' && str[idx] <= '9') {
   1518         idx++;
   1519         while (idx <= end_idx && str[idx] >= '0' && str[idx] <= '9') idx++;
   1520     }
   1521     /* if it starts with 0 we only expect one integer digit */
   1522     else if (str[idx] == '0') {
   1523         idx++;
   1524     }
   1525     /* no integer digits, error */
   1526     else {
   1527         PyErr_SetNone(PyExc_StopIteration);
   1528         return NULL;
   1529     }
   1530 
   1531     /* if the next char is '.' followed by a digit then read all float digits */
   1532     if (idx < end_idx && str[idx] == '.' && str[idx + 1] >= '0' && str[idx + 1] <= '9') {
   1533         is_float = 1;
   1534         idx += 2;
   1535         while (idx <= end_idx && str[idx] >= '0' && str[idx] <= '9') idx++;
   1536     }
   1537 
   1538     /* if the next char is 'e' or 'E' then maybe read the exponent (or backtrack) */
   1539     if (idx < end_idx && (str[idx] == 'e' || str[idx] == 'E')) {
   1540 
   1541         /* save the index of the 'e' or 'E' just in case we need to backtrack */
   1542         Py_ssize_t e_start = idx;
   1543         idx++;
   1544 
   1545         /* read an exponent sign if present */
   1546         if (idx < end_idx && (str[idx] == '-' || str[idx] == '+')) idx++;
   1547 
   1548         /* read all digits */
   1549         while (idx <= end_idx && str[idx] >= '0' && str[idx] <= '9') idx++;
   1550 
   1551         /* if we got a digit, then parse as float. if not, backtrack */
   1552         if (str[idx - 1] >= '0' && str[idx - 1] <= '9') {
   1553             is_float = 1;
   1554         }
   1555         else {
   1556             idx = e_start;
   1557         }
   1558     }
   1559 
   1560     /* copy the section we determined to be a number */
   1561     numstr = PyString_FromStringAndSize(&str[start], idx - start);
   1562     if (numstr == NULL)
   1563         return NULL;
   1564     if (is_float) {
   1565         /* parse as a float using a fast path if available, otherwise call user defined method */
   1566         if (s->parse_float != (PyObject *)&PyFloat_Type) {
   1567             rval = PyObject_CallFunctionObjArgs(s->parse_float, numstr, NULL);
   1568         }
   1569         else {
   1570             /* rval = PyFloat_FromDouble(PyOS_ascii_atof(PyString_AS_STRING(numstr))); */
   1571             double d = PyOS_string_to_double(PyString_AS_STRING(numstr),
   1572                                              NULL, NULL);
   1573             if (d == -1.0 && PyErr_Occurred())
   1574                 return NULL;
   1575             rval = PyFloat_FromDouble(d);
   1576         }
   1577     }
   1578     else {
   1579         /* parse as an int using a fast path if available, otherwise call user defined method */
   1580         if (s->parse_int != (PyObject *)&PyInt_Type) {
   1581             rval = PyObject_CallFunctionObjArgs(s->parse_int, numstr, NULL);
   1582         }
   1583         else {
   1584             rval = PyInt_FromString(PyString_AS_STRING(numstr), NULL, 10);
   1585         }
   1586     }
   1587     Py_DECREF(numstr);
   1588     *next_idx_ptr = idx;
   1589     return rval;
   1590 }
   1591 
   1592 static PyObject *
   1593 _match_number_unicode(PyScannerObject *s, PyObject *pystr, Py_ssize_t start, Py_ssize_t *next_idx_ptr) {
   1594     /* Read a JSON number from PyUnicode pystr.
   1595     idx is the index of the first character of the number
   1596     *next_idx_ptr is a return-by-reference index to the first character after
   1597         the number.
   1598 
   1599     Returns a new PyObject representation of that number:
   1600         PyInt, PyLong, or PyFloat.
   1601         May return other types if parse_int or parse_float are set
   1602     */
   1603     Py_UNICODE *str = PyUnicode_AS_UNICODE(pystr);
   1604     Py_ssize_t end_idx = PyUnicode_GET_SIZE(pystr) - 1;
   1605     Py_ssize_t idx = start;
   1606     int is_float = 0;
   1607     PyObject *rval;
   1608     PyObject *numstr;
   1609 
   1610     /* read a sign if it's there, make sure it's not the end of the string */
   1611     if (str[idx] == '-') {
   1612         idx++;
   1613         if (idx > end_idx) {
   1614             PyErr_SetNone(PyExc_StopIteration);
   1615             return NULL;
   1616         }
   1617     }
   1618 
   1619     /* read as many integer digits as we find as long as it doesn't start with 0 */
   1620     if (str[idx] >= '1' && str[idx] <= '9') {
   1621         idx++;
   1622         while (idx <= end_idx && str[idx] >= '0' && str[idx] <= '9') idx++;
   1623     }
   1624     /* if it starts with 0 we only expect one integer digit */
   1625     else if (str[idx] == '0') {
   1626         idx++;
   1627     }
   1628     /* no integer digits, error */
   1629     else {
   1630         PyErr_SetNone(PyExc_StopIteration);
   1631         return NULL;
   1632     }
   1633 
   1634     /* if the next char is '.' followed by a digit then read all float digits */
   1635     if (idx < end_idx && str[idx] == '.' && str[idx + 1] >= '0' && str[idx + 1] <= '9') {
   1636         is_float = 1;
   1637         idx += 2;
   1638         while (idx <= end_idx && str[idx] >= '0' && str[idx] <= '9') idx++;
   1639     }
   1640 
   1641     /* if the next char is 'e' or 'E' then maybe read the exponent (or backtrack) */
   1642     if (idx < end_idx && (str[idx] == 'e' || str[idx] == 'E')) {
   1643         Py_ssize_t e_start = idx;
   1644         idx++;
   1645 
   1646         /* read an exponent sign if present */
   1647         if (idx < end_idx && (str[idx] == '-' || str[idx] == '+')) idx++;
   1648 
   1649         /* read all digits */
   1650         while (idx <= end_idx && str[idx] >= '0' && str[idx] <= '9') idx++;
   1651 
   1652         /* if we got a digit, then parse as float. if not, backtrack */
   1653         if (str[idx - 1] >= '0' && str[idx - 1] <= '9') {
   1654             is_float = 1;
   1655         }
   1656         else {
   1657             idx = e_start;
   1658         }
   1659     }
   1660 
   1661     /* copy the section we determined to be a number */
   1662     numstr = PyUnicode_FromUnicode(&str[start], idx - start);
   1663     if (numstr == NULL)
   1664         return NULL;
   1665     if (is_float) {
   1666         /* parse as a float using a fast path if available, otherwise call user defined method */
   1667         if (s->parse_float != (PyObject *)&PyFloat_Type) {
   1668             rval = PyObject_CallFunctionObjArgs(s->parse_float, numstr, NULL);
   1669         }
   1670         else {
   1671             rval = PyFloat_FromString(numstr, NULL);
   1672         }
   1673     }
   1674     else {
   1675         /* no fast path for unicode -> int, just call */
   1676         rval = PyObject_CallFunctionObjArgs(s->parse_int, numstr, NULL);
   1677     }
   1678     Py_DECREF(numstr);
   1679     *next_idx_ptr = idx;
   1680     return rval;
   1681 }
   1682 
   1683 static PyObject *
   1684 scan_once_str(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *next_idx_ptr)
   1685 {
   1686     /* Read one JSON term (of any kind) from PyString pystr.
   1687     idx is the index of the first character of the term
   1688     *next_idx_ptr is a return-by-reference index to the first character after
   1689         the number.
   1690 
   1691     Returns a new PyObject representation of the term.
   1692     */
   1693     char *str = PyString_AS_STRING(pystr);
   1694     Py_ssize_t length = PyString_GET_SIZE(pystr);
   1695     PyObject *rval = NULL;
   1696     int fallthrough = 0;
   1697     if (idx >= length) {
   1698         PyErr_SetNone(PyExc_StopIteration);
   1699         return NULL;
   1700     }
   1701     if (Py_EnterRecursiveCall(" while decoding a JSON document"))
   1702         return NULL;
   1703     switch (str[idx]) {
   1704         case '"':
   1705             /* string */
   1706             rval = scanstring_str(pystr, idx + 1,
   1707                 PyString_AS_STRING(s->encoding),
   1708                 PyObject_IsTrue(s->strict),
   1709                 next_idx_ptr);
   1710             break;
   1711         case '{':
   1712             /* object */
   1713             rval = _parse_object_str(s, pystr, idx + 1, next_idx_ptr);
   1714             break;
   1715         case '[':
   1716             /* array */
   1717             rval = _parse_array_str(s, pystr, idx + 1, next_idx_ptr);
   1718             break;
   1719         case 'n':
   1720             /* null */
   1721             if ((idx + 3 < length) && str[idx + 1] == 'u' && str[idx + 2] == 'l' && str[idx + 3] == 'l') {
   1722                 Py_INCREF(Py_None);
   1723                 *next_idx_ptr = idx + 4;
   1724                 rval = Py_None;
   1725             }
   1726             else
   1727                 fallthrough = 1;
   1728             break;
   1729         case 't':
   1730             /* true */
   1731             if ((idx + 3 < length) && str[idx + 1] == 'r' && str[idx + 2] == 'u' && str[idx + 3] == 'e') {
   1732                 Py_INCREF(Py_True);
   1733                 *next_idx_ptr = idx + 4;
   1734                 rval = Py_True;
   1735             }
   1736             else
   1737                 fallthrough = 1;
   1738             break;
   1739         case 'f':
   1740             /* false */
   1741             if ((idx + 4 < length) && str[idx + 1] == 'a' && str[idx + 2] == 'l' && str[idx + 3] == 's' && str[idx + 4] == 'e') {
   1742                 Py_INCREF(Py_False);
   1743                 *next_idx_ptr = idx + 5;
   1744                 rval = Py_False;
   1745             }
   1746             else
   1747                 fallthrough = 1;
   1748             break;
   1749         case 'N':
   1750             /* NaN */
   1751             if ((idx + 2 < length) && str[idx + 1] == 'a' && str[idx + 2] == 'N') {
   1752                 rval = _parse_constant(s, "NaN", idx, next_idx_ptr);
   1753             }
   1754             else
   1755                 fallthrough = 1;
   1756             break;
   1757         case 'I':
   1758             /* Infinity */
   1759             if ((idx + 7 < length) && str[idx + 1] == 'n' && str[idx + 2] == 'f' && str[idx + 3] == 'i' && str[idx + 4] == 'n' && str[idx + 5] == 'i' && str[idx + 6] == 't' && str[idx + 7] == 'y') {
   1760                 rval = _parse_constant(s, "Infinity", idx, next_idx_ptr);
   1761             }
   1762             else
   1763                 fallthrough = 1;
   1764             break;
   1765         case '-':
   1766             /* -Infinity */
   1767             if ((idx + 8 < length) && str[idx + 1] == 'I' && str[idx + 2] == 'n' && str[idx + 3] == 'f' && str[idx + 4] == 'i' && str[idx + 5] == 'n' && str[idx + 6] == 'i' && str[idx + 7] == 't' && str[idx + 8] == 'y') {
   1768                 rval = _parse_constant(s, "-Infinity", idx, next_idx_ptr);
   1769             }
   1770             else
   1771                 fallthrough = 1;
   1772             break;
   1773         default:
   1774             fallthrough = 1;
   1775     }
   1776     /* Didn't find a string, object, array, or named constant. Look for a number. */
   1777     if (fallthrough)
   1778         rval = _match_number_str(s, pystr, idx, next_idx_ptr);
   1779     Py_LeaveRecursiveCall();
   1780     return rval;
   1781 }
   1782 
   1783 static PyObject *
   1784 scan_once_unicode(PyScannerObject *s, PyObject *pystr, Py_ssize_t idx, Py_ssize_t *next_idx_ptr)
   1785 {
   1786     /* Read one JSON term (of any kind) from PyUnicode pystr.
   1787     idx is the index of the first character of the term
   1788     *next_idx_ptr is a return-by-reference index to the first character after
   1789         the number.
   1790 
   1791     Returns a new PyObject representation of the term.
   1792     */
   1793     Py_UNICODE *str = PyUnicode_AS_UNICODE(pystr);
   1794     Py_ssize_t length = PyUnicode_GET_SIZE(pystr);
   1795     PyObject *rval = NULL;
   1796     int fallthrough = 0;
   1797     if (idx >= length) {
   1798         PyErr_SetNone(PyExc_StopIteration);
   1799         return NULL;
   1800     }
   1801     if (Py_EnterRecursiveCall(" while decoding a JSON document"))
   1802         return NULL;
   1803     switch (str[idx]) {
   1804         case '"':
   1805             /* string */
   1806             rval = scanstring_unicode(pystr, idx + 1,
   1807                 PyObject_IsTrue(s->strict),
   1808                 next_idx_ptr);
   1809             break;
   1810         case '{':
   1811             /* object */
   1812             rval = _parse_object_unicode(s, pystr, idx + 1, next_idx_ptr);
   1813             break;
   1814         case '[':
   1815             /* array */
   1816             rval = _parse_array_unicode(s, pystr, idx + 1, next_idx_ptr);
   1817             break;
   1818         case 'n':
   1819             /* null */
   1820             if ((idx + 3 < length) && str[idx + 1] == 'u' && str[idx + 2] == 'l' && str[idx + 3] == 'l') {
   1821                 Py_INCREF(Py_None);
   1822                 *next_idx_ptr = idx + 4;
   1823                 rval = Py_None;
   1824             }
   1825             else
   1826                 fallthrough = 1;
   1827             break;
   1828         case 't':
   1829             /* true */
   1830             if ((idx + 3 < length) && str[idx + 1] == 'r' && str[idx + 2] == 'u' && str[idx + 3] == 'e') {
   1831                 Py_INCREF(Py_True);
   1832                 *next_idx_ptr = idx + 4;
   1833                 rval = Py_True;
   1834             }
   1835             else
   1836                 fallthrough = 1;
   1837             break;
   1838         case 'f':
   1839             /* false */
   1840             if ((idx + 4 < length) && str[idx + 1] == 'a' && str[idx + 2] == 'l' && str[idx + 3] == 's' && str[idx + 4] == 'e') {
   1841                 Py_INCREF(Py_False);
   1842                 *next_idx_ptr = idx + 5;
   1843                 rval = Py_False;
   1844             }
   1845             else
   1846                 fallthrough = 1;
   1847             break;
   1848         case 'N':
   1849             /* NaN */
   1850             if ((idx + 2 < length) && str[idx + 1] == 'a' && str[idx + 2] == 'N') {
   1851                 rval = _parse_constant(s, "NaN", idx, next_idx_ptr);
   1852             }
   1853             else
   1854                 fallthrough = 1;
   1855             break;
   1856         case 'I':
   1857             /* Infinity */
   1858             if ((idx + 7 < length) && str[idx + 1] == 'n' && str[idx + 2] == 'f' && str[idx + 3] == 'i' && str[idx + 4] == 'n' && str[idx + 5] == 'i' && str[idx + 6] == 't' && str[idx + 7] == 'y') {
   1859                 rval = _parse_constant(s, "Infinity", idx, next_idx_ptr);
   1860             }
   1861             else
   1862                 fallthrough = 1;
   1863             break;
   1864         case '-':
   1865             /* -Infinity */
   1866             if ((idx + 8 < length) && str[idx + 1] == 'I' && str[idx + 2] == 'n' && str[idx + 3] == 'f' && str[idx + 4] == 'i' && str[idx + 5] == 'n' && str[idx + 6] == 'i' && str[idx + 7] == 't' && str[idx + 8] == 'y') {
   1867                 rval = _parse_constant(s, "-Infinity", idx, next_idx_ptr);
   1868             }
   1869             else
   1870                 fallthrough = 1;
   1871             break;
   1872         default:
   1873             fallthrough = 1;
   1874     }
   1875     /* Didn't find a string, object, array, or named constant. Look for a number. */
   1876     if (fallthrough)
   1877         rval = _match_number_unicode(s, pystr, idx, next_idx_ptr);
   1878     Py_LeaveRecursiveCall();
   1879     return rval;
   1880 }
   1881 
   1882 static PyObject *
   1883 scanner_call(PyObject *self, PyObject *args, PyObject *kwds)
   1884 {
   1885     /* Python callable interface to scan_once_{str,unicode} */
   1886     PyObject *pystr;
   1887     PyObject *rval;
   1888     Py_ssize_t idx;
   1889     Py_ssize_t next_idx = -1;
   1890     static char *kwlist[] = {"string", "idx", NULL};
   1891     PyScannerObject *s;
   1892     assert(PyScanner_Check(self));
   1893     s = (PyScannerObject *)self;
   1894     if (!PyArg_ParseTupleAndKeywords(args, kwds, "OO&:scan_once", kwlist, &pystr, _convertPyInt_AsSsize_t, &idx))
   1895         return NULL;
   1896 
   1897     if (PyString_Check(pystr)) {
   1898         rval = scan_once_str(s, pystr, idx, &next_idx);
   1899     }
   1900     else if (PyUnicode_Check(pystr)) {
   1901         rval = scan_once_unicode(s, pystr, idx, &next_idx);
   1902     }
   1903     else {
   1904         PyErr_Format(PyExc_TypeError,
   1905                  "first argument must be a string, not %.80s",
   1906                  Py_TYPE(pystr)->tp_name);
   1907         return NULL;
   1908     }
   1909     PyDict_Clear(s->memo);
   1910     return _build_rval_index_tuple(rval, next_idx);
   1911 }
   1912 
   1913 static PyObject *
   1914 scanner_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
   1915 {
   1916     PyScannerObject *s;
   1917     s = (PyScannerObject *)type->tp_alloc(type, 0);
   1918     if (s != NULL) {
   1919         s->encoding = NULL;
   1920         s->strict = NULL;
   1921         s->object_hook = NULL;
   1922         s->pairs_hook = NULL;
   1923         s->parse_float = NULL;
   1924         s->parse_int = NULL;
   1925         s->parse_constant = NULL;
   1926     }
   1927     return (PyObject *)s;
   1928 }
   1929 
   1930 static int
   1931 scanner_init(PyObject *self, PyObject *args, PyObject *kwds)
   1932 {
   1933     /* Initialize Scanner object */
   1934     PyObject *ctx;
   1935     static char *kwlist[] = {"context", NULL};
   1936     PyScannerObject *s;
   1937 
   1938     assert(PyScanner_Check(self));
   1939     s = (PyScannerObject *)self;
   1940 
   1941     if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:make_scanner", kwlist, &ctx))
   1942         return -1;
   1943 
   1944     if (s->memo == NULL) {
   1945         s->memo = PyDict_New();
   1946         if (s->memo == NULL)
   1947             goto bail;
   1948     }
   1949 
   1950     /* PyString_AS_STRING is used on encoding */
   1951     s->encoding = PyObject_GetAttrString(ctx, "encoding");
   1952     if (s->encoding == NULL)
   1953         goto bail;
   1954     if (s->encoding == Py_None) {
   1955         Py_DECREF(Py_None);
   1956         s->encoding = PyString_InternFromString(DEFAULT_ENCODING);
   1957     }
   1958     else if (PyUnicode_Check(s->encoding)) {
   1959         PyObject *tmp = PyUnicode_AsEncodedString(s->encoding, NULL, NULL);
   1960         Py_DECREF(s->encoding);
   1961         s->encoding = tmp;
   1962     }
   1963     if (s->encoding == NULL || !PyString_Check(s->encoding))
   1964         goto bail;
   1965 
   1966     /* All of these will fail "gracefully" so we don't need to verify them */
   1967     s->strict = PyObject_GetAttrString(ctx, "strict");
   1968     if (s->strict == NULL)
   1969         goto bail;
   1970     s->object_hook = PyObject_GetAttrString(ctx, "object_hook");
   1971     if (s->object_hook == NULL)
   1972         goto bail;
   1973     s->pairs_hook = PyObject_GetAttrString(ctx, "object_pairs_hook");
   1974     if (s->pairs_hook == NULL)
   1975         goto bail;
   1976     s->parse_float = PyObject_GetAttrString(ctx, "parse_float");
   1977     if (s->parse_float == NULL)
   1978         goto bail;
   1979     s->parse_int = PyObject_GetAttrString(ctx, "parse_int");
   1980     if (s->parse_int == NULL)
   1981         goto bail;
   1982     s->parse_constant = PyObject_GetAttrString(ctx, "parse_constant");
   1983     if (s->parse_constant == NULL)
   1984         goto bail;
   1985 
   1986     return 0;
   1987 
   1988 bail:
   1989     Py_CLEAR(s->encoding);
   1990     Py_CLEAR(s->strict);
   1991     Py_CLEAR(s->object_hook);
   1992     Py_CLEAR(s->pairs_hook);
   1993     Py_CLEAR(s->parse_float);
   1994     Py_CLEAR(s->parse_int);
   1995     Py_CLEAR(s->parse_constant);
   1996     return -1;
   1997 }
   1998 
   1999 PyDoc_STRVAR(scanner_doc, "JSON scanner object");
   2000 
   2001 static
   2002 PyTypeObject PyScannerType = {
   2003     PyObject_HEAD_INIT(NULL)
   2004     0,                    /* tp_internal */
   2005     "simplejson._speedups.Scanner",       /* tp_name */
   2006     sizeof(PyScannerObject), /* tp_basicsize */
   2007     0,                    /* tp_itemsize */
   2008     scanner_dealloc, /* tp_dealloc */
   2009     0,                    /* tp_print */
   2010     0,                    /* tp_getattr */
   2011     0,                    /* tp_setattr */
   2012     0,                    /* tp_compare */
   2013     0,                    /* tp_repr */
   2014     0,                    /* tp_as_number */
   2015     0,                    /* tp_as_sequence */
   2016     0,                    /* tp_as_mapping */
   2017     0,                    /* tp_hash */
   2018     scanner_call,         /* tp_call */
   2019     0,                    /* tp_str */
   2020     0,/* PyObject_GenericGetAttr, */                    /* tp_getattro */
   2021     0,/* PyObject_GenericSetAttr, */                    /* tp_setattro */
   2022     0,                    /* tp_as_buffer */
   2023     Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,   /* tp_flags */
   2024     scanner_doc,          /* tp_doc */
   2025     scanner_traverse,                    /* tp_traverse */
   2026     scanner_clear,                    /* tp_clear */
   2027     0,                    /* tp_richcompare */
   2028     0,                    /* tp_weaklistoffset */
   2029     0,                    /* tp_iter */
   2030     0,                    /* tp_iternext */
   2031     0,                    /* tp_methods */
   2032     scanner_members,                    /* tp_members */
   2033     0,                    /* tp_getset */
   2034     0,                    /* tp_base */
   2035     0,                    /* tp_dict */
   2036     0,                    /* tp_descr_get */
   2037     0,                    /* tp_descr_set */
   2038     0,                    /* tp_dictoffset */
   2039     scanner_init,                    /* tp_init */
   2040     0,/* PyType_GenericAlloc, */        /* tp_alloc */
   2041     scanner_new,          /* tp_new */
   2042     0,/* PyObject_GC_Del, */              /* tp_free */
   2043 };
   2044 
   2045 static PyObject *
   2046 encoder_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
   2047 {
   2048     PyEncoderObject *s;
   2049     s = (PyEncoderObject *)type->tp_alloc(type, 0);
   2050     if (s != NULL) {
   2051         s->markers = NULL;
   2052         s->defaultfn = NULL;
   2053         s->encoder = NULL;
   2054         s->indent = NULL;
   2055         s->key_separator = NULL;
   2056         s->item_separator = NULL;
   2057         s->sort_keys = NULL;
   2058         s->skipkeys = NULL;
   2059         s->key_memo = NULL;
   2060         s->item_sort_key = NULL;
   2061         s->Decimal = NULL;
   2062     }
   2063     return (PyObject *)s;
   2064 }
   2065 
   2066 static int
   2067 encoder_init(PyObject *self, PyObject *args, PyObject *kwds)
   2068 {
   2069     /* initialize Encoder object */
   2070     static char *kwlist[] = {"markers", "default", "encoder", "indent", "key_separator", "item_separator", "sort_keys", "skipkeys", "allow_nan", "key_memo", "use_decimal", "namedtuple_as_object", "tuple_as_array", "bigint_as_string", "item_sort_key", "Decimal", NULL};
   2071 
   2072     PyEncoderObject *s;
   2073     PyObject *markers, *defaultfn, *encoder, *indent, *key_separator;
   2074     PyObject *item_separator, *sort_keys, *skipkeys, *allow_nan, *key_memo;
   2075     PyObject *use_decimal, *namedtuple_as_object, *tuple_as_array;
   2076     PyObject *bigint_as_string, *item_sort_key, *Decimal;
   2077 
   2078     assert(PyEncoder_Check(self));
   2079     s = (PyEncoderObject *)self;
   2080 
   2081     if (!PyArg_ParseTupleAndKeywords(args, kwds, "OOOOOOOOOOOOOOOO:make_encoder", kwlist,
   2082         &markers, &defaultfn, &encoder, &indent, &key_separator, &item_separator,
   2083         &sort_keys, &skipkeys, &allow_nan, &key_memo, &use_decimal,
   2084         &namedtuple_as_object, &tuple_as_array, &bigint_as_string,
   2085         &item_sort_key, &Decimal))
   2086         return -1;
   2087 
   2088     s->markers = markers;
   2089     s->defaultfn = defaultfn;
   2090     s->encoder = encoder;
   2091     s->indent = indent;
   2092     s->key_separator = key_separator;
   2093     s->item_separator = item_separator;
   2094     s->sort_keys = sort_keys;
   2095     s->skipkeys = skipkeys;
   2096     s->key_memo = key_memo;
   2097     s->fast_encode = (PyCFunction_Check(s->encoder) && PyCFunction_GetFunction(s->encoder) == (PyCFunction)py_encode_basestring_ascii);
   2098     s->allow_nan = PyObject_IsTrue(allow_nan);
   2099     s->use_decimal = PyObject_IsTrue(use_decimal);
   2100     s->namedtuple_as_object = PyObject_IsTrue(namedtuple_as_object);
   2101     s->tuple_as_array = PyObject_IsTrue(tuple_as_array);
   2102     s->bigint_as_string = PyObject_IsTrue(bigint_as_string);
   2103     s->item_sort_key = item_sort_key;
   2104     s->Decimal = Decimal;
   2105 
   2106     Py_INCREF(s->markers);
   2107     Py_INCREF(s->defaultfn);
   2108     Py_INCREF(s->encoder);
   2109     Py_INCREF(s->indent);
   2110     Py_INCREF(s->key_separator);
   2111     Py_INCREF(s->item_separator);
   2112     Py_INCREF(s->sort_keys);
   2113     Py_INCREF(s->skipkeys);
   2114     Py_INCREF(s->key_memo);
   2115     Py_INCREF(s->item_sort_key);
   2116     Py_INCREF(s->Decimal);
   2117     return 0;
   2118 }
   2119 
   2120 static PyObject *
   2121 encoder_call(PyObject *self, PyObject *args, PyObject *kwds)
   2122 {
   2123     /* Python callable interface to encode_listencode_obj */
   2124     static char *kwlist[] = {"obj", "_current_indent_level", NULL};
   2125     PyObject *obj;
   2126     PyObject *rval;
   2127     Py_ssize_t indent_level;
   2128     PyEncoderObject *s;
   2129     assert(PyEncoder_Check(self));
   2130     s = (PyEncoderObject *)self;
   2131     if (!PyArg_ParseTupleAndKeywords(args, kwds, "OO&:_iterencode", kwlist,
   2132         &obj, _convertPyInt_AsSsize_t, &indent_level))
   2133         return NULL;
   2134     rval = PyList_New(0);
   2135     if (rval == NULL)
   2136         return NULL;
   2137     if (encoder_listencode_obj(s, rval, obj, indent_level)) {
   2138         Py_DECREF(rval);
   2139         return NULL;
   2140     }
   2141     return rval;
   2142 }
   2143 
   2144 static PyObject *
   2145 _encoded_const(PyObject *obj)
   2146 {
   2147     /* Return the JSON string representation of None, True, False */
   2148     if (obj == Py_None) {
   2149         static PyObject *s_null = NULL;
   2150         if (s_null == NULL) {
   2151             s_null = PyString_InternFromString("null");
   2152         }
   2153         Py_INCREF(s_null);
   2154         return s_null;
   2155     }
   2156     else if (obj == Py_True) {
   2157         static PyObject *s_true = NULL;
   2158         if (s_true == NULL) {
   2159             s_true = PyString_InternFromString("true");
   2160         }
   2161         Py_INCREF(s_true);
   2162         return s_true;
   2163     }
   2164     else if (obj == Py_False) {
   2165         static PyObject *s_false = NULL;
   2166         if (s_false == NULL) {
   2167             s_false = PyString_InternFromString("false");
   2168         }
   2169         Py_INCREF(s_false);
   2170         return s_false;
   2171     }
   2172     else {
   2173         PyErr_SetString(PyExc_ValueError, "not a const");
   2174         return NULL;
   2175     }
   2176 }
   2177 
   2178 static PyObject *
   2179 encoder_encode_float(PyEncoderObject *s, PyObject *obj)
   2180 {
   2181     /* Return the JSON representation of a PyFloat */
   2182     double i = PyFloat_AS_DOUBLE(obj);
   2183     if (!Py_IS_FINITE(i)) {
   2184         if (!s->allow_nan) {
   2185             PyErr_SetString(PyExc_ValueError, "Out of range float values are not JSON compliant");
   2186             return NULL;
   2187         }
   2188         if (i > 0) {
   2189             return PyString_FromString("Infinity");
   2190         }
   2191         else if (i < 0) {
   2192             return PyString_FromString("-Infinity");
   2193         }
   2194         else {
   2195             return PyString_FromString("NaN");
   2196         }
   2197     }
   2198     /* Use a better float format here? */
   2199     return PyObject_Repr(obj);
   2200 }
   2201 
   2202 static PyObject *
   2203 encoder_encode_string(PyEncoderObject *s, PyObject *obj)
   2204 {
   2205     /* Return the JSON representation of a string */
   2206     if (s->fast_encode)
   2207         return py_encode_basestring_ascii(NULL, obj);
   2208     else
   2209         return PyObject_CallFunctionObjArgs(s->encoder, obj, NULL);
   2210 }
   2211 
   2212 static int
   2213 _steal_list_append(PyObject *lst, PyObject *stolen)
   2214 {
   2215     /* Append stolen and then decrement its reference count */
   2216     int rval = PyList_Append(lst, stolen);
   2217     Py_DECREF(stolen);
   2218     return rval;
   2219 }
   2220 
   2221 static int
   2222 encoder_listencode_obj(PyEncoderObject *s, PyObject *rval, PyObject *obj, Py_ssize_t indent_level)
   2223 {
   2224     /* Encode Python object obj to a JSON term, rval is a PyList */
   2225     int rv = -1;
   2226     if (Py_EnterRecursiveCall(" while encoding a JSON document"))
   2227         return rv;
   2228     do {
   2229         if (obj == Py_None || obj == Py_True || obj == Py_False) {
   2230             PyObject *cstr = _encoded_const(obj);
   2231             if (cstr != NULL)
   2232                 rv = _steal_list_append(rval, cstr);
   2233         }
   2234         else if (PyString_Check(obj) || PyUnicode_Check(obj))
   2235         {
   2236             PyObject *encoded = encoder_encode_string(s, obj);
   2237             if (encoded != NULL)
   2238                 rv = _steal_list_append(rval, encoded);
   2239         }
   2240         else if (PyInt_Check(obj) || PyLong_Check(obj)) {
   2241             PyObject *encoded = PyObject_Str(obj);
   2242             if (encoded != NULL) {
   2243                 if (s->bigint_as_string) {
   2244                     encoded = maybe_quote_bigint(encoded, obj);
   2245                     if (encoded == NULL)
   2246                         break;
   2247                 }
   2248                 rv = _steal_list_append(rval, encoded);
   2249             }
   2250         }
   2251         else if (PyFloat_Check(obj)) {
   2252             PyObject *encoded = encoder_encode_float(s, obj);
   2253             if (encoded != NULL)
   2254                 rv = _steal_list_append(rval, encoded);
   2255         }
   2256         else if (s->namedtuple_as_object && _is_namedtuple(obj)) {
   2257             PyObject *newobj = PyObject_CallMethod(obj, "_asdict", NULL);
   2258             if (newobj != NULL) {
   2259                 rv = encoder_listencode_dict(s, rval, newobj, indent_level);
   2260                 Py_DECREF(newobj);
   2261             }
   2262         }
   2263         else if (PyList_Check(obj) || (s->tuple_as_array && PyTuple_Check(obj))) {
   2264             rv = encoder_listencode_list(s, rval, obj, indent_level);
   2265         }
   2266         else if (PyDict_Check(obj)) {
   2267             rv = encoder_listencode_dict(s, rval, obj, indent_level);
   2268         }
   2269         else if (s->use_decimal && PyObject_TypeCheck(obj, s->Decimal)) {
   2270             PyObject *encoded = PyObject_Str(obj);
   2271             if (encoded != NULL)
   2272                 rv = _steal_list_append(rval, encoded);
   2273         }
   2274         else {
   2275             PyObject *ident = NULL;
   2276             PyObject *newobj;
   2277             if (s->markers != Py_None) {
   2278                 int has_key;
   2279                 ident = PyLong_FromVoidPtr(obj);
   2280                 if (ident == NULL)
   2281                     break;
   2282                 has_key = PyDict_Contains(s->markers, ident);
   2283                 if (has_key) {
   2284                     if (has_key != -1)
   2285                         PyErr_SetString(PyExc_ValueError, "Circular reference detected");
   2286                     Py_DECREF(ident);
   2287                     break;
   2288                 }
   2289                 if (PyDict_SetItem(s->markers, ident, obj)) {
   2290                     Py_DECREF(ident);
   2291                     break;
   2292                 }
   2293             }
   2294             newobj = PyObject_CallFunctionObjArgs(s->defaultfn, obj, NULL);
   2295             if (newobj == NULL) {
   2296                 Py_XDECREF(ident);
   2297                 break;
   2298             }
   2299             rv = encoder_listencode_obj(s, rval, newobj, indent_level);
   2300             Py_DECREF(newobj);
   2301             if (rv) {
   2302                 Py_XDECREF(ident);
   2303                 rv = -1;
   2304             }
   2305             else if (ident != NULL) {
   2306                 if (PyDict_DelItem(s->markers, ident)) {
   2307                     Py_XDECREF(ident);
   2308                     rv = -1;
   2309                 }
   2310                 Py_XDECREF(ident);
   2311             }
   2312         }
   2313     } while (0);
   2314     Py_LeaveRecursiveCall();
   2315     return rv;
   2316 }
   2317 
   2318 static int
   2319 encoder_listencode_dict(PyEncoderObject *s, PyObject *rval, PyObject *dct, Py_ssize_t indent_level)
   2320 {
   2321     /* Encode Python dict dct a JSON term, rval is a PyList */
   2322     static PyObject *open_dict = NULL;
   2323     static PyObject *close_dict = NULL;
   2324     static PyObject *empty_dict = NULL;
   2325     static PyObject *iteritems = NULL;
   2326     PyObject *kstr = NULL;
   2327     PyObject *ident = NULL;
   2328     PyObject *iter = NULL;
   2329     PyObject *item = NULL;
   2330     PyObject *items = NULL;
   2331     PyObject *encoded = NULL;
   2332     int skipkeys;
   2333     Py_ssize_t idx;
   2334 
   2335     if (open_dict == NULL || close_dict == NULL || empty_dict == NULL || iteritems == NULL) {
   2336         open_dict = PyString_InternFromString("{");
   2337         close_dict = PyString_InternFromString("}");
   2338         empty_dict = PyString_InternFromString("{}");
   2339         iteritems = PyString_InternFromString("iteritems");
   2340         if (open_dict == NULL || close_dict == NULL || empty_dict == NULL || iteritems == NULL)
   2341             return -1;
   2342     }
   2343     if (PyDict_Size(dct) == 0)
   2344         return PyList_Append(rval, empty_dict);
   2345 
   2346     if (s->markers != Py_None) {
   2347         int has_key;
   2348         ident = PyLong_FromVoidPtr(dct);
   2349         if (ident == NULL)
   2350             goto bail;
   2351         has_key = PyDict_Contains(s->markers, ident);
   2352         if (has_key) {
   2353             if (has_key != -1)
   2354                 PyErr_SetString(PyExc_ValueError, "Circular reference detected");
   2355             goto bail;
   2356         }
   2357         if (PyDict_SetItem(s->markers, ident, dct)) {
   2358             goto bail;
   2359         }
   2360     }
   2361 
   2362     if (PyList_Append(rval, open_dict))
   2363         goto bail;
   2364 
   2365     if (s->indent != Py_None) {
   2366         /* TODO: DOES NOT RUN */
   2367         indent_level += 1;
   2368         /*
   2369             newline_indent = '\n' + (_indent * _current_indent_level)
   2370             separator = _item_separator + newline_indent
   2371             buf += newline_indent
   2372         */
   2373     }
   2374 
   2375     if (PyCallable_Check(s->item_sort_key)) {
   2376         if (PyDict_CheckExact(dct))
   2377             items = PyDict_Items(dct);
   2378         else
   2379             items = PyMapping_Items(dct);
   2380         PyObject_CallMethod(items, "sort", "OO", Py_None, s->item_sort_key);
   2381     }
   2382     else if (PyObject_IsTrue(s->sort_keys)) {
   2383         /* First sort the keys then replace them with (key, value) tuples. */
   2384         Py_ssize_t i, nitems;
   2385         if (PyDict_CheckExact(dct))
   2386             items = PyDict_Keys(dct);
   2387         else
   2388             items = PyMapping_Keys(dct);
   2389         if (items == NULL)
   2390             goto bail;
   2391         if (!PyList_Check(items)) {
   2392             PyErr_SetString(PyExc_ValueError, "keys must return list");
   2393             goto bail;
   2394         }
   2395         if (PyList_Sort(items) < 0)
   2396             goto bail;
   2397         nitems = PyList_GET_SIZE(items);
   2398         for (i = 0; i < nitems; i++) {
   2399             PyObject *key, *value;
   2400             key = PyList_GET_ITEM(items, i);
   2401             value = PyDict_GetItem(dct, key);
   2402             item = PyTuple_Pack(2, key, value);
   2403             if (item == NULL)
   2404                 goto bail;
   2405             PyList_SET_ITEM(items, i, item);
   2406             Py_DECREF(key);
   2407         }
   2408     }
   2409     else {
   2410         if (PyDict_CheckExact(dct))
   2411             items = PyDict_Items(dct);
   2412         else
   2413             items = PyMapping_Items(dct);
   2414     }
   2415     if (items == NULL)
   2416         goto bail;
   2417     iter = PyObject_GetIter(items);
   2418     Py_DECREF(items);
   2419     if (iter == NULL)
   2420         goto bail;
   2421 
   2422     skipkeys = PyObject_IsTrue(s->skipkeys);
   2423     idx = 0;
   2424     while ((item = PyIter_Next(iter))) {
   2425         PyObject *encoded, *key, *value;
   2426         if (!PyTuple_Check(item) || Py_SIZE(item) != 2) {
   2427             PyErr_SetString(PyExc_ValueError, "items must return 2-tuples");
   2428             goto bail;
   2429         }
   2430         key = PyTuple_GET_ITEM(item, 0);
   2431         if (key == NULL)
   2432             goto bail;
   2433         value = PyTuple_GET_ITEM(item, 1);
   2434         if (value == NULL)
   2435             goto bail;
   2436 
   2437         encoded = PyDict_GetItem(s->key_memo, key);
   2438         if (encoded != NULL) {
   2439             Py_INCREF(encoded);
   2440         }
   2441         else if (PyString_Check(key) || PyUnicode_Check(key)) {
   2442             Py_INCREF(key);
   2443             kstr = key;
   2444         }
   2445         else if (PyFloat_Check(key)) {
   2446             kstr = encoder_encode_float(s, key);
   2447             if (kstr == NULL)
   2448                 goto bail;
   2449         }
   2450         else if (key == Py_True || key == Py_False || key == Py_None) {
   2451             /* This must come before the PyInt_Check because
   2452                True and False are also 1 and 0.*/
   2453             kstr = _encoded_const(key);
   2454             if (kstr == NULL)
   2455                 goto bail;
   2456         }
   2457         else if (PyInt_Check(key) || PyLong_Check(key)) {
   2458             kstr = PyObject_Str(key);
   2459             if (kstr == NULL)
   2460                 goto bail;
   2461         }
   2462         else if (skipkeys) {
   2463             Py_DECREF(item);
   2464             continue;
   2465         }
   2466         else {
   2467             /* TODO: include repr of key */
   2468             PyErr_SetString(PyExc_TypeError, "keys must be a string");
   2469             goto bail;
   2470         }
   2471 
   2472         if (idx) {
   2473             if (PyList_Append(rval, s->item_separator))
   2474                 goto bail;
   2475         }
   2476 
   2477         if (encoded == NULL) {
   2478             encoded = encoder_encode_string(s, kstr);
   2479             Py_CLEAR(kstr);
   2480             if (encoded == NULL)
   2481                 goto bail;
   2482             if (PyDict_SetItem(s->key_memo, key, encoded))
   2483                 goto bail;
   2484         }
   2485         if (PyList_Append(rval, encoded)) {
   2486             goto bail;
   2487         }
   2488         Py_CLEAR(encoded);
   2489         if (PyList_Append(rval, s->key_separator))
   2490             goto bail;
   2491         if (encoder_listencode_obj(s, rval, value, indent_level))
   2492             goto bail;
   2493         Py_CLEAR(item);
   2494         idx += 1;
   2495     }
   2496     Py_CLEAR(iter);
   2497     if (PyErr_Occurred())
   2498         goto bail;
   2499     if (ident != NULL) {
   2500         if (PyDict_DelItem(s->markers, ident))
   2501             goto bail;
   2502         Py_CLEAR(ident);
   2503     }
   2504     if (s->indent != Py_None) {
   2505         /* TODO: DOES NOT RUN */
   2506         indent_level -= 1;
   2507         /*
   2508             yield '\n' + (_indent * _current_indent_level)
   2509         */
   2510     }
   2511     if (PyList_Append(rval, close_dict))
   2512         goto bail;
   2513     return 0;
   2514 
   2515 bail:
   2516     Py_XDECREF(encoded);
   2517     Py_XDECREF(items);
   2518     Py_XDECREF(iter);
   2519     Py_XDECREF(kstr);
   2520     Py_XDECREF(ident);
   2521     return -1;
   2522 }
   2523 
   2524 
   2525 static int
   2526 encoder_listencode_list(PyEncoderObject *s, PyObject *rval, PyObject *seq, Py_ssize_t indent_level)
   2527 {
   2528     /* Encode Python list seq to a JSON term, rval is a PyList */
   2529     static PyObject *open_array = NULL;
   2530     static PyObject *close_array = NULL;
   2531     static PyObject *empty_array = NULL;
   2532     PyObject *ident = NULL;
   2533     PyObject *iter = NULL;
   2534     PyObject *obj = NULL;
   2535     int is_true;
   2536     int i = 0;
   2537 
   2538     if (open_array == NULL || close_array == NULL || empty_array == NULL) {
   2539         open_array = PyString_InternFromString("[");
   2540         close_array = PyString_InternFromString("]");
   2541         empty_array = PyString_InternFromString("[]");
   2542         if (open_array == NULL || close_array == NULL || empty_array == NULL)
   2543             return -1;
   2544     }
   2545     ident = NULL;
   2546     is_true = PyObject_IsTrue(seq);
   2547     if (is_true == -1)
   2548         return -1;
   2549     else if (is_true == 0)
   2550         return PyList_Append(rval, empty_array);
   2551 
   2552     if (s->markers != Py_None) {
   2553         int has_key;
   2554         ident = PyLong_FromVoidPtr(seq);
   2555         if (ident == NULL)
   2556             goto bail;
   2557         has_key = PyDict_Contains(s->markers, ident);
   2558         if (has_key) {
   2559             if (has_key != -1)
   2560                 PyErr_SetString(PyExc_ValueError, "Circular reference detected");
   2561             goto bail;
   2562         }
   2563         if (PyDict_SetItem(s->markers, ident, seq)) {
   2564             goto bail;
   2565         }
   2566     }
   2567 
   2568     iter = PyObject_GetIter(seq);
   2569     if (iter == NULL)
   2570         goto bail;
   2571 
   2572     if (PyList_Append(rval, open_array))
   2573         goto bail;
   2574     if (s->indent != Py_None) {
   2575         /* TODO: DOES NOT RUN */
   2576         indent_level += 1;
   2577         /*
   2578             newline_indent = '\n' + (_indent * _current_indent_level)
   2579             separator = _item_separator + newline_indent
   2580             buf += newline_indent
   2581         */
   2582     }
   2583     while ((obj = PyIter_Next(iter))) {
   2584         if (i) {
   2585             if (PyList_Append(rval, s->item_separator))
   2586                 goto bail;
   2587         }
   2588         if (encoder_listencode_obj(s, rval, obj, indent_level))
   2589             goto bail;
   2590         i++;
   2591         Py_CLEAR(obj);
   2592     }
   2593     Py_CLEAR(iter);
   2594     if (PyErr_Occurred())
   2595         goto bail;
   2596     if (ident != NULL) {
   2597         if (PyDict_DelItem(s->markers, ident))
   2598             goto bail;
   2599         Py_CLEAR(ident);
   2600     }
   2601     if (s->indent != Py_None) {
   2602         /* TODO: DOES NOT RUN */
   2603         indent_level -= 1;
   2604         /*
   2605             yield '\n' + (_indent * _current_indent_level)
   2606         */
   2607     }
   2608     if (PyList_Append(rval, close_array))
   2609         goto bail;
   2610     return 0;
   2611 
   2612 bail:
   2613     Py_XDECREF(obj);
   2614     Py_XDECREF(iter);
   2615     Py_XDECREF(ident);
   2616     return -1;
   2617 }
   2618 
   2619 static void
   2620 encoder_dealloc(PyObject *self)
   2621 {
   2622     /* Deallocate Encoder */
   2623     encoder_clear(self);
   2624     Py_TYPE(self)->tp_free(self);
   2625 }
   2626 
   2627 static int
   2628 encoder_traverse(PyObject *self, visitproc visit, void *arg)
   2629 {
   2630     PyEncoderObject *s;
   2631     assert(PyEncoder_Check(self));
   2632     s = (PyEncoderObject *)self;
   2633     Py_VISIT(s->markers);
   2634     Py_VISIT(s->defaultfn);
   2635     Py_VISIT(s->encoder);
   2636     Py_VISIT(s->indent);
   2637     Py_VISIT(s->key_separator);
   2638     Py_VISIT(s->item_separator);
   2639     Py_VISIT(s->sort_keys);
   2640     Py_VISIT(s->skipkeys);
   2641     Py_VISIT(s->key_memo);
   2642     Py_VISIT(s->item_sort_key);
   2643     return 0;
   2644 }
   2645 
   2646 static int
   2647 encoder_clear(PyObject *self)
   2648 {
   2649     /* Deallocate Encoder */
   2650     PyEncoderObject *s;
   2651     assert(PyEncoder_Check(self));
   2652     s = (PyEncoderObject *)self;
   2653     Py_CLEAR(s->markers);
   2654     Py_CLEAR(s->defaultfn);
   2655     Py_CLEAR(s->encoder);
   2656     Py_CLEAR(s->indent);
   2657     Py_CLEAR(s->key_separator);
   2658     Py_CLEAR(s->item_separator);
   2659     Py_CLEAR(s->sort_keys);
   2660     Py_CLEAR(s->skipkeys);
   2661     Py_CLEAR(s->key_memo);
   2662     Py_CLEAR(s->item_sort_key);
   2663     Py_CLEAR(s->Decimal);
   2664     return 0;
   2665 }
   2666 
   2667 PyDoc_STRVAR(encoder_doc, "_iterencode(obj, _current_indent_level) -> iterable");
   2668 
   2669 static
   2670 PyTypeObject PyEncoderType = {
   2671     PyObject_HEAD_INIT(NULL)
   2672     0,                    /* tp_internal */
   2673     "simplejson._speedups.Encoder",       /* tp_name */
   2674     sizeof(PyEncoderObject), /* tp_basicsize */
   2675     0,                    /* tp_itemsize */
   2676     encoder_dealloc, /* tp_dealloc */
   2677     0,                    /* tp_print */
   2678     0,                    /* tp_getattr */
   2679     0,                    /* tp_setattr */
   2680     0,                    /* tp_compare */
   2681     0,                    /* tp_repr */
   2682     0,                    /* tp_as_number */
   2683     0,                    /* tp_as_sequence */
   2684     0,                    /* tp_as_mapping */
   2685     0,                    /* tp_hash */
   2686     encoder_call,         /* tp_call */
   2687     0,                    /* tp_str */
   2688     0,                    /* tp_getattro */
   2689     0,                    /* tp_setattro */
   2690     0,                    /* tp_as_buffer */
   2691     Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,   /* tp_flags */
   2692     encoder_doc,          /* tp_doc */
   2693     encoder_traverse,     /* tp_traverse */
   2694     encoder_clear,        /* tp_clear */
   2695     0,                    /* tp_richcompare */
   2696     0,                    /* tp_weaklistoffset */
   2697     0,                    /* tp_iter */
   2698     0,                    /* tp_iternext */
   2699     0,                    /* tp_methods */
   2700     encoder_members,      /* tp_members */
   2701     0,                    /* tp_getset */
   2702     0,                    /* tp_base */
   2703     0,                    /* tp_dict */
   2704     0,                    /* tp_descr_get */
   2705     0,                    /* tp_descr_set */
   2706     0,                    /* tp_dictoffset */
   2707     encoder_init,         /* tp_init */
   2708     0,                    /* tp_alloc */
   2709     encoder_new,          /* tp_new */
   2710     0,                    /* tp_free */
   2711 };
   2712 
   2713 static PyMethodDef speedups_methods[] = {
   2714     {"encode_basestring_ascii",
   2715         (PyCFunction)py_encode_basestring_ascii,
   2716         METH_O,
   2717         pydoc_encode_basestring_ascii},
   2718     {"scanstring",
   2719         (PyCFunction)py_scanstring,
   2720         METH_VARARGS,
   2721         pydoc_scanstring},
   2722     {NULL, NULL, 0, NULL}
   2723 };
   2724 
   2725 PyDoc_STRVAR(module_doc,
   2726 "simplejson speedups\n");
   2727 
   2728 void
   2729 init_speedups(void)
   2730 {
   2731     PyObject *m;
   2732     PyScannerType.tp_new = PyType_GenericNew;
   2733     if (PyType_Ready(&PyScannerType) < 0)
   2734         return;
   2735     PyEncoderType.tp_new = PyType_GenericNew;
   2736     if (PyType_Ready(&PyEncoderType) < 0)
   2737         return;
   2738 
   2739 
   2740     m = Py_InitModule3("_speedups", speedups_methods, module_doc);
   2741     Py_INCREF((PyObject*)&PyScannerType);
   2742     PyModule_AddObject(m, "make_scanner", (PyObject*)&PyScannerType);
   2743     Py_INCREF((PyObject*)&PyEncoderType);
   2744     PyModule_AddObject(m, "make_encoder", (PyObject*)&PyEncoderType);
   2745 }
   2746