ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/JSON-XS/XS.xs
(Generate patch)

Comparing JSON-XS/XS.xs (file contents):
Revision 1.1 by root, Thu Mar 22 16:40:16 2007 UTC vs.
Revision 1.55 by root, Mon Jul 23 22:57:40 2007 UTC

… …
3#include "XSUB.h" 3#include "XSUB.h"
4 4
5#include "assert.h" 5#include "assert.h"
6#include "string.h" 6#include "string.h"
7#include "stdlib.h" 7#include "stdlib.h"
8#include "stdio.h"
8 9
10#if defined(__BORLANDC__) || defined(_MSC_VER)
11# define snprintf _snprintf // C compilers have this in stdio.h
12#endif
13
14// some old perls do not have this, try to make it work, no
15// guarentees, though. if it breaks, you get to keep the pieces.
16#ifndef UTF8_MAXBYTES
17# define UTF8_MAXBYTES 13
18#endif
19
9#define F_ASCII 0x00000001 20#define F_ASCII 0x00000001UL
21#define F_LATIN1 0x00000002UL
10#define F_UTF8 0x00000002 22#define F_UTF8 0x00000004UL
11#define F_INDENT 0x00000004 23#define F_INDENT 0x00000008UL
12#define F_CANONICAL 0x00000008 24#define F_CANONICAL 0x00000010UL
13#define F_SPACE_BEFORE 0x00000010 25#define F_SPACE_BEFORE 0x00000020UL
14#define F_SPACE_AFTER 0x00000020 26#define F_SPACE_AFTER 0x00000040UL
15#define F_JSON_RPC 0x00000040 27#define F_ALLOW_NONREF 0x00000100UL
28#define F_SHRINK 0x00000200UL
29#define F_ALLOW_BLESSED 0x00000400UL
30#define F_CONV_BLESSED 0x00000800UL
31#define F_MAXDEPTH 0xf8000000UL
32#define S_MAXDEPTH 27
33#define F_MAXSIZE 0x01f00000UL
34#define S_MAXSIZE 20
35#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
16 36
17#define F_DEFAULT 0 37#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
38#define DEC_SIZE(flags) (1UL << ((flags & F_MAXSIZE ) >> S_MAXSIZE ))
39
40#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
41#define F_DEFAULT (9UL << S_MAXDEPTH)
18 42
19#define INIT_SIZE 32 // initial scalar size to be allocated 43#define INIT_SIZE 32 // initial scalar size to be allocated
44#define INDENT_STEP 3 // spaces per indentation level
45
46#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
20 47
21#define SB do { 48#define SB do {
22#define SE } while (0) 49#define SE } while (0)
23 50
24static HV *json_stash; 51#if __GNUC__ >= 3
52# define expect(expr,value) __builtin_expect ((expr),(value))
53# define inline inline
54#else
55# define expect(expr,value) (expr)
56# define inline static
57#endif
58
59#define expect_false(expr) expect ((expr) != 0, 0)
60#define expect_true(expr) expect ((expr) != 0, 1)
61
62static HV *json_stash, *json_boolean_stash; // JSON::XS::
63static SV *json_true, *json_false;
64
65typedef struct {
66 U32 flags;
67 SV *cb_object;
68 HV *cb_sk_object;
69} JSON;
70
71/////////////////////////////////////////////////////////////////////////////
72// utility functions
73
74inline void
75shrink (SV *sv)
76{
77 sv_utf8_downgrade (sv, 1);
78 if (SvLEN (sv) > SvCUR (sv) + 1)
79 {
80#ifdef SvPV_shrink_to_cur
81 SvPV_shrink_to_cur (sv);
82#elif defined (SvPV_renew)
83 SvPV_renew (sv, SvCUR (sv) + 1);
84#endif
85 }
86}
87
88// decode an utf-8 character and return it, or (UV)-1 in
89// case of an error.
90// we special-case "safe" characters from U+80 .. U+7FF,
91// but use the very good perl function to parse anything else.
92// note that we never call this function for a ascii codepoints
93inline UV
94decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
95{
96 if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
97 return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
98 else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
99 {
100 *clen = 2;
101 return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
102 }
103 else
104 {
105 *clen = (STRLEN)-1;
106 return (UV)-1;
107 }
108}
109
110/////////////////////////////////////////////////////////////////////////////
111// encoder
25 112
26// structure used for encoding JSON 113// structure used for encoding JSON
27typedef struct 114typedef struct
28{ 115{
29 char *cur; 116 char *cur; // SvPVX (sv) + current output position
30 STRLEN len; // SvLEN (sv)
31 char *end; // SvEND (sv) 117 char *end; // SvEND (sv)
32 SV *sv; 118 SV *sv; // result scalar
33 UV flags; 119 JSON json;
34 int max_recurse; 120 U32 indent; // indentation level
35 int indent; 121 U32 maxdepth; // max. indentation/recursion level
36} enc_t; 122} enc_t;
37 123
38// structure used for decoding JSON 124inline void
39typedef struct
40{
41 char *cur;
42 char *end;
43 char *err;
44 UV flags;
45} dec_t;
46
47static UV *
48SvJSON (SV *sv)
49{
50 if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
51 croak ("object is not of type JSON::XS");
52
53 return &SvUVX (SvRV (sv));
54}
55
56/////////////////////////////////////////////////////////////////////////////
57
58static void
59need (enc_t *enc, STRLEN len) 125need (enc_t *enc, STRLEN len)
60{ 126{
61 if (enc->cur + len >= enc->end) 127 if (expect_false (enc->cur + len >= enc->end))
62 { 128 {
63 STRLEN cur = enc->cur - SvPVX (enc->sv); 129 STRLEN cur = enc->cur - SvPVX (enc->sv);
64 SvGROW (enc->sv, cur + len + 1); 130 SvGROW (enc->sv, cur + len + 1);
65 enc->cur = SvPVX (enc->sv) + cur; 131 enc->cur = SvPVX (enc->sv) + cur;
66 enc->end = SvEND (enc->sv); 132 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
67 } 133 }
68} 134}
69 135
70static void 136inline void
71encode_ch (enc_t *enc, char ch) 137encode_ch (enc_t *enc, char ch)
72{ 138{
73 need (enc, 1); 139 need (enc, 1);
74 *enc->cur++ = ch; 140 *enc->cur++ = ch;
75} 141}
… …
77static void 143static void
78encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8) 144encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8)
79{ 145{
80 char *end = str + len; 146 char *end = str + len;
81 147
148 need (enc, len);
149
82 while (str < end) 150 while (str < end)
83 { 151 {
84 unsigned char ch = *(unsigned char *)str; 152 unsigned char ch = *(unsigned char *)str;
153
85 if (ch >= 0x20 && ch < 0x80) // most common case 154 if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
86 { 155 {
156 if (expect_false (ch == '"')) // but with slow exceptions
157 {
158 need (enc, len += 1);
159 *enc->cur++ = '\\';
160 *enc->cur++ = '"';
161 }
162 else if (expect_false (ch == '\\'))
163 {
164 need (enc, len += 1);
165 *enc->cur++ = '\\';
166 *enc->cur++ = '\\';
167 }
168 else
87 *enc->cur++ = ch; 169 *enc->cur++ = ch;
170
88 str++; 171 ++str;
89 } 172 }
90 else 173 else
91 { 174 {
92 STRLEN clen; 175 switch (ch)
93 UV uch;
94
95 if (is_utf8)
96 {
97 uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);
98 if (clen < 0)
99 croak ("malformed UTF-8 character in string, cannot convert to JSON");
100 } 176 {
101 else 177 case '\010': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
102 { 178 case '\011': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
103 uch = ch; 179 case '\012': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
104 clen = 1; 180 case '\014': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
105 } 181 case '\015': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
106 182
107 need (enc, len += 6); 183 default:
108
109 if (uch < 0xa0 || enc->flags & F_ASCII)
110 {
111 if (uch > 0xFFFFUL)
112 { 184 {
185 STRLEN clen;
186 UV uch;
187
188 if (is_utf8)
189 {
190 uch = decode_utf8 (str, end - str, &clen);
191 if (clen == (STRLEN)-1)
192 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
193 }
194 else
195 {
196 uch = ch;
113 len += 6; 197 clen = 1;
198 }
199
200 if (uch > 0x10FFFFUL)
201 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
202
203 if (uch < 0x80 || enc->json.flags & F_ASCII || (enc->json.flags & F_LATIN1 && uch > 0xFF))
204 {
205 if (uch > 0xFFFFUL)
206 {
114 need (enc, len += 6); 207 need (enc, len += 11);
115 sprintf (enc->cur, "\\u%04x\\u%04x", 208 sprintf (enc->cur, "\\u%04x\\u%04x",
116 (uch - 0x10000) / 0x400 + 0xD800, 209 (int)((uch - 0x10000) / 0x400 + 0xD800),
117 (uch - 0x10000) % 0x400 + 0xDC00); 210 (int)((uch - 0x10000) % 0x400 + 0xDC00));
118 enc->cur += 12; 211 enc->cur += 12;
212 }
213 else
214 {
215 static char hexdigit [16] = "0123456789abcdef";
216 need (enc, len += 5);
217 *enc->cur++ = '\\';
218 *enc->cur++ = 'u';
219 *enc->cur++ = hexdigit [ uch >> 12 ];
220 *enc->cur++ = hexdigit [(uch >> 8) & 15];
221 *enc->cur++ = hexdigit [(uch >> 4) & 15];
222 *enc->cur++ = hexdigit [(uch >> 0) & 15];
223 }
224
225 str += clen;
226 }
227 else if (enc->json.flags & F_LATIN1)
228 {
229 *enc->cur++ = uch;
230 str += clen;
231 }
232 else if (is_utf8)
233 {
234 need (enc, len += clen);
235 do
236 {
237 *enc->cur++ = *str++;
238 }
239 while (--clen);
240 }
241 else
242 {
243 need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
244 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
245 ++str;
246 }
119 } 247 }
120 else
121 {
122 sprintf (enc->cur, "\\u%04x", uch);
123 enc->cur += 6;
124 }
125 }
126 else if (is_utf8)
127 { 248 }
128 memcpy (enc->cur, str, clen);
129 enc->cur += clen;
130 }
131 else
132 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
133
134 str += clen;
135 } 249 }
136 250
137 --len; 251 --len;
138 } 252 }
139} 253}
140 254
141#define INDENT SB \ 255inline void
256encode_indent (enc_t *enc)
257{
142 if (enc->flags & F_INDENT) \ 258 if (enc->json.flags & F_INDENT)
143 { \ 259 {
144 int i_; \ 260 int spaces = enc->indent * INDENT_STEP;
145 need (enc, enc->indent); \ 261
146 for (i_ = enc->indent * 3; i_--; )\ 262 need (enc, spaces);
263 memset (enc->cur, ' ', spaces);
264 enc->cur += spaces;
265 }
266}
267
268inline void
269encode_space (enc_t *enc)
270{
271 need (enc, 1);
272 encode_ch (enc, ' ');
273}
274
275inline void
276encode_nl (enc_t *enc)
277{
278 if (enc->json.flags & F_INDENT)
279 {
280 need (enc, 1);
147 encode_ch (enc, ' '); \ 281 encode_ch (enc, '\n');
148 } \ 282 }
149 SE 283}
150 284
151#define SPACE SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, ' '); } SE 285inline void
152#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE 286encode_comma (enc_t *enc)
153#define COMMA SB \ 287{
154 encode_ch (enc, ','); \ 288 encode_ch (enc, ',');
289
155 if (enc->flags & F_INDENT) \ 290 if (enc->json.flags & F_INDENT)
156 NL; \ 291 encode_nl (enc);
157 else if (enc->flags & F_SPACE_AFTER) \ 292 else if (enc->json.flags & F_SPACE_AFTER)
158 SPACE; \ 293 encode_space (enc);
159 SE 294}
160 295
161static void encode_sv (enc_t *enc, SV *sv); 296static void encode_sv (enc_t *enc, SV *sv);
162 297
163static void 298static void
164encode_av (enc_t *enc, AV *av) 299encode_av (enc_t *enc, AV *av)
165{ 300{
166 int i, len = av_len (av); 301 int i, len = av_len (av);
167 302
168 encode_ch (enc, '['); NL; 303 if (enc->indent >= enc->maxdepth)
304 croak ("data structure too deep (hit recursion limit)");
305
306 encode_ch (enc, '['); encode_nl (enc);
169 ++enc->indent; 307 ++enc->indent;
170 308
171 for (i = 0; i <= len; ++i) 309 for (i = 0; i <= len; ++i)
172 { 310 {
173 INDENT; 311 SV **svp = av_fetch (av, i, 0);
174 encode_sv (enc, *av_fetch (av, i, 0)); 312
313 encode_indent (enc);
314
315 if (svp)
316 encode_sv (enc, *svp);
317 else
318 encode_str (enc, "null", 4, 0);
175 319
176 if (i < len) 320 if (i < len)
177 COMMA; 321 encode_comma (enc);
178 } 322 }
179 323
180 NL; 324 encode_nl (enc);
181 325
182 --enc->indent; 326 --enc->indent;
183 INDENT; encode_ch (enc, ']'); 327 encode_indent (enc); encode_ch (enc, ']');
184} 328}
185 329
186static void 330static void
187encode_he (enc_t *enc, HE *he) 331encode_he (enc_t *enc, HE *he)
188{ 332{
… …
190 334
191 if (HeKLEN (he) == HEf_SVKEY) 335 if (HeKLEN (he) == HEf_SVKEY)
192 { 336 {
193 SV *sv = HeSVKEY (he); 337 SV *sv = HeSVKEY (he);
194 STRLEN len; 338 STRLEN len;
339 char *str;
340
341 SvGETMAGIC (sv);
195 char *str = SvPV (sv, len); 342 str = SvPV (sv, len);
196 343
197 encode_str (enc, str, len, SvUTF8 (sv)); 344 encode_str (enc, str, len, SvUTF8 (sv));
198 } 345 }
199 else 346 else
200 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he)); 347 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
201 348
202 encode_ch (enc, '"'); 349 encode_ch (enc, '"');
203 350
204 if (enc->flags & F_SPACE_BEFORE) SPACE; 351 if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
205 encode_ch (enc, ':'); 352 encode_ch (enc, ':');
206 if (enc->flags & F_SPACE_AFTER ) SPACE; 353 if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
207 encode_sv (enc, HeVAL (he)); 354 encode_sv (enc, HeVAL (he));
208} 355}
209 356
210// compare hash entries, used when all keys are bytestrings 357// compare hash entries, used when all keys are bytestrings
211static int 358static int
… …
217 HE *b = *(HE **)b_; 364 HE *b = *(HE **)b_;
218 365
219 STRLEN la = HeKLEN (a); 366 STRLEN la = HeKLEN (a);
220 STRLEN lb = HeKLEN (b); 367 STRLEN lb = HeKLEN (b);
221 368
222 if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb))) 369 if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))
223 cmp = la < lb ? -1 : la == lb ? 0 : 1; 370 cmp = la - lb;
224 371
225 return cmp; 372 return cmp;
226} 373}
227 374
228// compare hash entries, used when some keys are sv's or utf-x 375// compare hash entries, used when some keys are sv's or utf-x
… …
235static void 382static void
236encode_hv (enc_t *enc, HV *hv) 383encode_hv (enc_t *enc, HV *hv)
237{ 384{
238 int count, i; 385 int count, i;
239 386
387 if (enc->indent >= enc->maxdepth)
388 croak ("data structure too deep (hit recursion limit)");
389
240 encode_ch (enc, '{'); NL; ++enc->indent; 390 encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
241 391
242 if ((count = hv_iterinit (hv))) 392 if ((count = hv_iterinit (hv)))
243 { 393 {
244 // for canonical output we have to sort by keys first 394 // for canonical output we have to sort by keys first
245 // actually, this is mostly due to the stupid so-called 395 // actually, this is mostly due to the stupid so-called
246 // security workaround added somewhere in 5.8.x. 396 // security workaround added somewhere in 5.8.x.
247 // that randomises hash orderings 397 // that randomises hash orderings
248 if (enc->flags & F_CANONICAL) 398 if (enc->json.flags & F_CANONICAL)
249 { 399 {
250 HE *he, *hes [count];
251 int fast = 1; 400 int fast = 1;
401 HE *he;
402#if defined(__BORLANDC__) || defined(_MSC_VER)
403 HE **hes = _alloca (count * sizeof (HE));
404#else
405 HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
406#endif
252 407
253 i = 0; 408 i = 0;
254 while ((he = hv_iternext (hv))) 409 while ((he = hv_iternext (hv)))
255 { 410 {
256 hes [i++] = he; 411 hes [i++] = he;
… …
262 417
263 if (fast) 418 if (fast)
264 qsort (hes, count, sizeof (HE *), he_cmp_fast); 419 qsort (hes, count, sizeof (HE *), he_cmp_fast);
265 else 420 else
266 { 421 {
267 // hack to disable "use bytes" 422 // hack to forcefully disable "use bytes"
268 COP *oldcop = PL_curcop, cop; 423 COP cop = *PL_curcop;
269 cop.op_private = 0; 424 cop.op_private = 0;
425
426 ENTER;
427 SAVETMPS;
428
429 SAVEVPTR (PL_curcop);
270 PL_curcop = &cop; 430 PL_curcop = &cop;
271 431
272 SAVETMPS;
273 qsort (hes, count, sizeof (HE *), he_cmp_slow); 432 qsort (hes, count, sizeof (HE *), he_cmp_slow);
433
274 FREETMPS; 434 FREETMPS;
275 435 LEAVE;
276 PL_curcop = oldcop;
277 } 436 }
278 437
279 for (i = 0; i < count; ++i) 438 for (i = 0; i < count; ++i)
280 { 439 {
281 INDENT; 440 encode_indent (enc);
282 encode_he (enc, hes [i]); 441 encode_he (enc, hes [i]);
283 442
284 if (i < count - 1) 443 if (i < count - 1)
285 COMMA; 444 encode_comma (enc);
286 }
287
288 NL; 445 }
446
447 encode_nl (enc);
289 } 448 }
290 else 449 else
291 { 450 {
292 SV *sv;
293 HE *he = hv_iternext (hv); 451 HE *he = hv_iternext (hv);
294 452
295 for (;;) 453 for (;;)
296 { 454 {
297 INDENT; 455 encode_indent (enc);
298 encode_he (enc, he); 456 encode_he (enc, he);
299 457
300 if (!(he = hv_iternext (hv))) 458 if (!(he = hv_iternext (hv)))
301 break; 459 break;
302 460
303 COMMA; 461 encode_comma (enc);
304 }
305
306 NL; 462 }
463
464 encode_nl (enc);
307 } 465 }
308 } 466 }
309 467
310 --enc->indent; INDENT; encode_ch (enc, '}'); 468 --enc->indent; encode_indent (enc); encode_ch (enc, '}');
469}
470
471// encode objects, arrays and special \0=false and \1=true values.
472static void
473encode_rv (enc_t *enc, SV *sv)
474{
475 svtype svt;
476
477 SvGETMAGIC (sv);
478 svt = SvTYPE (sv);
479
480 if (expect_false (SvOBJECT (sv)))
481 {
482 if (SvSTASH (sv) == json_boolean_stash)
483 {
484 if (SvIV (sv))
485 encode_str (enc, "true", 4, 0);
486 else
487 encode_str (enc, "false", 5, 0);
488 }
489 else
490 {
491#if 0
492 if (0 && sv_derived_from (rv, "JSON::Literal"))
493 {
494 // not yet
495 }
496#endif
497 if (enc->json.flags & F_CONV_BLESSED)
498 {
499 // we re-bless the reference to get overload and other niceties right
500 GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
501
502 if (to_json)
503 {
504 int count;
505 dSP;
506
507 ENTER; SAVETMPS; PUSHMARK (SP);
508 XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
509
510 // calling with G_SCALAR ensures that we always get a 1 return value
511 PUTBACK;
512 call_sv ((SV *)GvCV (to_json), G_SCALAR);
513 SPAGAIN;
514
515 // catch this surprisingly common error
516 if (SvROK (TOPs) && SvRV (TOPs) == sv)
517 croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
518
519 sv = POPs;
520 PUTBACK;
521
522 encode_sv (enc, sv);
523
524 FREETMPS; LEAVE;
525 }
526 else if (enc->json.flags & F_ALLOW_BLESSED)
527 encode_str (enc, "null", 4, 0);
528 else
529 croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
530 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
531 }
532 else if (enc->json.flags & F_ALLOW_BLESSED)
533 encode_str (enc, "null", 4, 0);
534 else
535 croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
536 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
537 }
538 }
539 else if (svt == SVt_PVHV)
540 encode_hv (enc, (HV *)sv);
541 else if (svt == SVt_PVAV)
542 encode_av (enc, (AV *)sv);
543 else if (svt < SVt_PVAV)
544 {
545 STRLEN len = 0;
546 char *pv = svt ? SvPV (sv, len) : 0;
547
548 if (len == 1 && *pv == '1')
549 encode_str (enc, "true", 4, 0);
550 else if (len == 1 && *pv == '0')
551 encode_str (enc, "false", 5, 0);
552 else
553 croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
554 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
555 }
556 else
557 croak ("encountered %s, but JSON can only represent references to arrays or hashes",
558 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
311} 559}
312 560
313static void 561static void
314encode_sv (enc_t *enc, SV *sv) 562encode_sv (enc_t *enc, SV *sv)
315{ 563{
564 SvGETMAGIC (sv);
565
316 if (SvPOKp (sv)) 566 if (SvPOKp (sv))
317 { 567 {
318 STRLEN len; 568 STRLEN len;
319 char *str = SvPV (sv, len); 569 char *str = SvPV (sv, len);
320 encode_ch (enc, '"'); 570 encode_ch (enc, '"');
321 encode_str (enc, str, len, SvUTF8 (sv)); 571 encode_str (enc, str, len, SvUTF8 (sv));
322 encode_ch (enc, '"'); 572 encode_ch (enc, '"');
323 } 573 }
324 else if (SvNOKp (sv)) 574 else if (SvNOKp (sv))
325 { 575 {
576 // trust that perl will do the right thing w.r.t. JSON syntax.
326 need (enc, NV_DIG + 32); 577 need (enc, NV_DIG + 32);
327 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 578 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
328 enc->cur += strlen (enc->cur); 579 enc->cur += strlen (enc->cur);
329 } 580 }
330 else if (SvIOKp (sv)) 581 else if (SvIOKp (sv))
331 { 582 {
332 need (enc, 64); 583 // we assume we can always read an IV as a UV
584 if (SvUV (sv) & ~(UV)0x7fff)
585 {
586 // large integer, use the (rather slow) snprintf way.
587 need (enc, sizeof (UV) * 3);
333 enc->cur += 588 enc->cur +=
334 SvIsUV(sv) 589 SvIsUV(sv)
335 ? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv)) 590 ? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
336 : snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv)); 591 : snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
592 }
593 else
594 {
595 // optimise the "small number case"
596 // code will likely be branchless and use only a single multiplication
597 I32 i = SvIV (sv);
598 U32 u;
599 char digit, nz = 0;
600
601 need (enc, 6);
602
603 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
604 u = i < 0 ? -i : i;
605
606 // convert to 4.28 fixed-point representation
607 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
608
609 // now output digit by digit, each time masking out the integer part
610 // and multiplying by 5 while moving the decimal point one to the right,
611 // resulting in a net multiplication by 10.
612 // we always write the digit to memory but conditionally increment
613 // the pointer, to ease the usage of conditional move instructions.
614 digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
615 digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
616 digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
617 digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
618 digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
619 }
337 } 620 }
338 else if (SvROK (sv)) 621 else if (SvROK (sv))
339 { 622 encode_rv (enc, SvRV (sv));
340 if (!--enc->max_recurse)
341 croak ("data structure too deep (hit recursion limit)");
342
343 sv = SvRV (sv);
344
345 switch (SvTYPE (sv))
346 {
347 case SVt_PVAV: encode_av (enc, (AV *)sv); break;
348 case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
349
350 default:
351 croak ("JSON can only represent references to arrays or hashes");
352 }
353 }
354 else if (!SvOK (sv)) 623 else if (!SvOK (sv))
355 encode_str (enc, "null", 4, 0); 624 encode_str (enc, "null", 4, 0);
356 else 625 else
357 croak ("encountered perl type that JSON cannot handle"); 626 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
627 SvPV_nolen (sv), SvFLAGS (sv));
358} 628}
359 629
360static SV * 630static SV *
361encode_json (SV *scalar, UV flags) 631encode_json (SV *scalar, JSON *json)
362{ 632{
363 enc_t enc; 633 enc_t enc;
364 enc.flags = flags; 634
635 if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
636 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
637
638 enc.json = *json;
365 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE)); 639 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
366 enc.cur = SvPVX (enc.sv); 640 enc.cur = SvPVX (enc.sv);
367 enc.end = SvEND (enc.sv); 641 enc.end = SvEND (enc.sv);
368 enc.max_recurse = 0;
369 enc.indent = 0; 642 enc.indent = 0;
643 enc.maxdepth = DEC_DEPTH (enc.json.flags);
370 644
371 SvPOK_only (enc.sv); 645 SvPOK_only (enc.sv);
372 encode_sv (&enc, scalar); 646 encode_sv (&enc, scalar);
373 647
648 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
649 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
650
374 if (!(flags & (F_ASCII | F_UTF8))) 651 if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
375 SvUTF8_on (enc.sv); 652 SvUTF8_on (enc.sv);
376 653
377 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv)); 654 if (enc.json.flags & F_SHRINK)
655 shrink (enc.sv);
656
378 return enc.sv; 657 return enc.sv;
379} 658}
380 659
381///////////////////////////////////////////////////////////////////////////// 660/////////////////////////////////////////////////////////////////////////////
661// decoder
382 662
383#define WS \ 663// structure used for decoding JSON
664typedef struct
665{
666 char *cur; // current parser pointer
667 char *end; // end of input string
668 const char *err; // parse error, if != 0
669 JSON json;
670 U32 depth; // recursion depth
671 U32 maxdepth; // recursion depth limit
672} dec_t;
673
674inline void
675decode_ws (dec_t *dec)
676{
384 for (;;) \ 677 for (;;)
385 { \ 678 {
386 char ch = *dec->cur; \ 679 char ch = *dec->cur;
680
387 if (ch > 0x20 \ 681 if (ch > 0x20
388 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \ 682 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
389 break; \ 683 break;
684
390 ++dec->cur; \ 685 ++dec->cur;
391 } 686 }
687}
392 688
393#define ERR(reason) SB dec->err = reason; goto fail; SE 689#define ERR(reason) SB dec->err = reason; goto fail; SE
690
394#define EXPECT_CH(ch) SB \ 691#define EXPECT_CH(ch) SB \
395 if (*dec->cur != ch) \ 692 if (*dec->cur != ch) \
396 ERR (# ch " expected"); \ 693 ERR (# ch " expected"); \
397 ++dec->cur; \ 694 ++dec->cur; \
398 SE 695 SE
399 696
697#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
698#define DEC_DEC_DEPTH --dec->depth
699
400static SV *decode_sv (dec_t *dec); 700static SV *decode_sv (dec_t *dec);
401
402#define APPEND_CH(ch) SB \
403 SvGROW (sv, cur + 1 + 1); \
404 SvPVX (sv)[cur++] = (ch); \
405 SE
406 701
407static signed char decode_hexdigit[256]; 702static signed char decode_hexdigit[256];
408 703
409static UV 704static UV
410decode_4hex (dec_t *dec) 705decode_4hex (dec_t *dec)
411{ 706{
412 signed char d1, d2, d3, d4; 707 signed char d1, d2, d3, d4;
708 unsigned char *cur = (unsigned char *)dec->cur;
413 709
414 d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]]; 710 d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
415 if (d1 < 0) ERR ("four hexadecimal digits expected"); 711 d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
416 d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]]; 712 d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
417 if (d2 < 0) ERR ("four hexadecimal digits expected"); 713 d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
418 d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
419 if (d3 < 0) ERR ("four hexadecimal digits expected");
420 d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
421 if (d4 < 0) ERR ("four hexadecimal digits expected");
422 714
423 dec->cur += 4; 715 dec->cur += 4;
424 716
425 return ((UV)d1) << 12 717 return ((UV)d1) << 12
426 | ((UV)d2) << 8 718 | ((UV)d2) << 8
… …
432} 724}
433 725
434static SV * 726static SV *
435decode_str (dec_t *dec) 727decode_str (dec_t *dec)
436{ 728{
437 SV *sv = NEWSV (0,2); 729 SV *sv = 0;
438 STRLEN cur = 0;
439 int utf8 = 0; 730 int utf8 = 0;
731 char *dec_cur = dec->cur;
440 732
441 for (;;) 733 do
442 { 734 {
443 unsigned char ch = *(unsigned char *)dec->cur; 735 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
736 char *cur = buf;
444 737
445 if (ch == '"') 738 do
446 break;
447 else if (ch == '\\')
448 { 739 {
449 switch (*++dec->cur) 740 unsigned char ch = *(unsigned char *)dec_cur++;
741
742 if (expect_false (ch == '"'))
743 {
744 --dec_cur;
745 break;
450 { 746 }
451 case '\\': 747 else if (expect_false (ch == '\\'))
452 case '/': 748 {
453 case '"': APPEND_CH (*dec->cur++); break; 749 switch (*dec_cur)
454
455 case 'b': APPEND_CH ('\010'); ++dec->cur; break;
456 case 't': APPEND_CH ('\011'); ++dec->cur; break;
457 case 'n': APPEND_CH ('\012'); ++dec->cur; break;
458 case 'f': APPEND_CH ('\014'); ++dec->cur; break;
459 case 'r': APPEND_CH ('\015'); ++dec->cur; break;
460
461 case 'u':
462 { 750 {
463 UV lo, hi; 751 case '\\':
464 ++dec->cur; 752 case '/':
753 case '"': *cur++ = *dec_cur++; break;
465 754
466 hi = decode_4hex (dec); 755 case 'b': ++dec_cur; *cur++ = '\010'; break;
467 if (hi == (UV)-1) 756 case 't': ++dec_cur; *cur++ = '\011'; break;
468 goto fail; 757 case 'n': ++dec_cur; *cur++ = '\012'; break;
758 case 'f': ++dec_cur; *cur++ = '\014'; break;
759 case 'r': ++dec_cur; *cur++ = '\015'; break;
469 760
470 // possibly a surrogate pair 761 case 'u':
471 if (hi >= 0xd800 && hi < 0xdc00)
472 { 762 {
473 if (dec->cur [0] != '\\' || dec->cur [1] != 'u') 763 UV lo, hi;
474 ERR ("illegal surrogate character"); 764 ++dec_cur;
475 765
476 dec->cur += 2; 766 dec->cur = dec_cur;
477
478 lo = decode_4hex (dec); 767 hi = decode_4hex (dec);
768 dec_cur = dec->cur;
479 if (lo == (UV)-1) 769 if (hi == (UV)-1)
480 goto fail; 770 goto fail;
481 771
772 // possibly a surrogate pair
773 if (hi >= 0xd800)
774 if (hi < 0xdc00)
775 {
776 if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
777 ERR ("missing low surrogate character in surrogate pair");
778
779 dec_cur += 2;
780
781 dec->cur = dec_cur;
782 lo = decode_4hex (dec);
783 dec_cur = dec->cur;
784 if (lo == (UV)-1)
785 goto fail;
786
482 if (lo < 0xdc00 || lo >= 0xe000) 787 if (lo < 0xdc00 || lo >= 0xe000)
483 ERR ("surrogate pair expected"); 788 ERR ("surrogate pair expected");
484 789
485 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; 790 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
791 }
792 else if (hi < 0xe000)
793 ERR ("missing high surrogate character in surrogate pair");
794
795 if (hi >= 0x80)
796 {
797 utf8 = 1;
798
799 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
800 }
801 else
802 *cur++ = hi;
486 } 803 }
487 else if (lo >= 0xdc00 && lo < 0xe000)
488 ERR ("illegal surrogate character");
489
490 if (hi >= 0x80)
491 { 804 break;
492 utf8 = 1;
493 805
494 SvGROW (sv, cur + 4 + 1); // at most 4 bytes for 21 bits
495 cur = (char *)uvuni_to_utf8_flags (SvPVX (sv) + cur, hi, 0) - SvPVX (sv);
496 }
497 else 806 default:
498 APPEND_CH (hi); 807 --dec_cur;
808 ERR ("illegal backslash escape sequence in string");
499 } 809 }
810 }
811 else if (expect_true (ch >= 0x20 && ch <= 0x7f))
812 *cur++ = ch;
813 else if (ch >= 0x80)
814 {
815 STRLEN clen;
816 UV uch;
817
818 --dec_cur;
819
820 uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
821 if (clen == (STRLEN)-1)
822 ERR ("malformed UTF-8 character in JSON string");
823
824 do
825 *cur++ = *dec_cur++;
826 while (--clen);
827
828 utf8 = 1;
829 }
830 else
831 {
832 --dec_cur;
833
834 if (!ch)
835 ERR ("unexpected end of string while parsing JSON string");
500 break; 836 else
837 ERR ("invalid character encountered while parsing JSON string");
501 } 838 }
502 } 839 }
503 else if (ch >= 0x20 && ch <= 0x7f) 840 while (cur < buf + SHORT_STRING_LEN);
504 APPEND_CH (*dec->cur++); 841
505 else if (ch >= 0x80) 842 {
843 STRLEN len = cur - buf;
844
845 if (sv)
506 { 846 {
507 STRLEN clen; 847 SvGROW (sv, SvCUR (sv) + len + 1);
508 UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY); 848 memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
509 if (clen < 0) 849 SvCUR_set (sv, SvCUR (sv) + len);
510 ERR ("malformed UTF-8 character in string, cannot convert to JSON");
511
512 SvGROW (sv, cur + clen + 1); // at most 4 bytes for 21 bits
513 memcpy (SvPVX (sv) + cur, dec->cur, clen);
514 dec->cur += clen;
515 } 850 }
516 else 851 else
517 ERR ("invalid character encountered"); 852 sv = newSVpvn (buf, len);
518 } 853 }
854 }
855 while (*dec_cur != '"');
519 856
520 ++dec->cur; 857 ++dec_cur;
521 858
859 if (sv)
860 {
522 SvPOK_only (sv); 861 SvPOK_only (sv);
523
524 SvCUR_set (sv, cur);
525 *SvEND (sv) = 0; 862 *SvEND (sv) = 0;
526 863
527 if (utf8) 864 if (utf8)
528 SvUTF8_on (sv); 865 SvUTF8_on (sv);
866 }
867 else
868 sv = newSVpvn ("", 0);
529 869
870 dec->cur = dec_cur;
530 return sv; 871 return sv;
531 872
532fail: 873fail:
533 SvREFCNT_dec (sv); 874 dec->cur = dec_cur;
534 return 0; 875 return 0;
535} 876}
536 877
537static SV * 878static SV *
538decode_num (dec_t *dec) 879decode_num (dec_t *dec)
… …
548 { 889 {
549 ++dec->cur; 890 ++dec->cur;
550 if (*dec->cur >= '0' && *dec->cur <= '9') 891 if (*dec->cur >= '0' && *dec->cur <= '9')
551 ERR ("malformed number (leading zero must not be followed by another digit)"); 892 ERR ("malformed number (leading zero must not be followed by another digit)");
552 } 893 }
553 894 else if (*dec->cur < '0' || *dec->cur > '9')
554 // int 895 ERR ("malformed number (no digits after initial minus)");
896 else
897 do
898 {
899 ++dec->cur;
900 }
555 while (*dec->cur >= '0' && *dec->cur <= '9') 901 while (*dec->cur >= '0' && *dec->cur <= '9');
556 ++dec->cur;
557 902
558 // [frac] 903 // [frac]
559 if (*dec->cur == '.') 904 if (*dec->cur == '.')
560 { 905 {
561 is_nv = 1; 906 ++dec->cur;
907
908 if (*dec->cur < '0' || *dec->cur > '9')
909 ERR ("malformed number (no digits after decimal point)");
562 910
563 do 911 do
564 { 912 {
565 ++dec->cur; 913 ++dec->cur;
566 } 914 }
567 while (*dec->cur >= '0' && *dec->cur <= '9'); 915 while (*dec->cur >= '0' && *dec->cur <= '9');
916
917 is_nv = 1;
568 } 918 }
569 919
570 // [exp] 920 // [exp]
571 if (*dec->cur == 'e' || *dec->cur == 'E') 921 if (*dec->cur == 'e' || *dec->cur == 'E')
572 { 922 {
573 is_nv = 1;
574
575 ++dec->cur; 923 ++dec->cur;
924
576 if (*dec->cur == '-' || *dec->cur == '+') 925 if (*dec->cur == '-' || *dec->cur == '+')
577 ++dec->cur; 926 ++dec->cur;
578 927
928 if (*dec->cur < '0' || *dec->cur > '9')
929 ERR ("malformed number (no digits after exp sign)");
930
931 do
932 {
933 ++dec->cur;
934 }
579 while (*dec->cur >= '0' && *dec->cur <= '9') 935 while (*dec->cur >= '0' && *dec->cur <= '9');
580 ++dec->cur; 936
937 is_nv = 1;
581 } 938 }
582 939
583 if (!is_nv) 940 if (!is_nv)
584 { 941 {
585 UV uv; 942 // special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
586 int numtype = grok_number (start, dec->cur - start, &uv); 943 if (*start == '-')
587 if (numtype & IS_NUMBER_IN_UV) 944 switch (dec->cur - start)
588 if (numtype & IS_NUMBER_NEG)
589 { 945 {
590 if (uv < (UV)IV_MIN) 946 case 2: return newSViv (-( start [1] - '0' * 1));
591 return newSViv (-(IV)uv); 947 case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
948 case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
949 case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
592 } 950 }
951 else
952 switch (dec->cur - start)
953 {
954 case 1: return newSViv ( start [0] - '0' * 1);
955 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
956 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
957 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
958 }
959
960 {
961 UV uv;
962 int numtype = grok_number (start, dec->cur - start, &uv);
963 if (numtype & IS_NUMBER_IN_UV)
964 if (numtype & IS_NUMBER_NEG)
965 {
966 if (uv < (UV)IV_MIN)
967 return newSViv (-(IV)uv);
968 }
593 else 969 else
594 return newSVuv (uv); 970 return newSVuv (uv);
971
972 // here would likely be the place for bigint support
595 } 973 }
974 }
596 975
976 // if we ever support bigint or bigfloat, this is the place for bigfloat
597 return newSVnv (Atof (start)); 977 return newSVnv (Atof (start));
598 978
599fail: 979fail:
600 return 0; 980 return 0;
601} 981}
… …
603static SV * 983static SV *
604decode_av (dec_t *dec) 984decode_av (dec_t *dec)
605{ 985{
606 AV *av = newAV (); 986 AV *av = newAV ();
607 987
988 DEC_INC_DEPTH;
989 decode_ws (dec);
990
991 if (*dec->cur == ']')
992 ++dec->cur;
993 else
608 for (;;) 994 for (;;)
609 { 995 {
610 SV *value; 996 SV *value;
611 997
612 value = decode_sv (dec); 998 value = decode_sv (dec);
613 if (!value) 999 if (!value)
614 goto fail; 1000 goto fail;
615 1001
616 av_push (av, value); 1002 av_push (av, value);
617 1003
618 WS; 1004 decode_ws (dec);
619 1005
620 if (*dec->cur == ']') 1006 if (*dec->cur == ']')
621 { 1007 {
622 ++dec->cur; 1008 ++dec->cur;
623 break; 1009 break;
1010 }
624 } 1011
625
626 if (*dec->cur != ',') 1012 if (*dec->cur != ',')
627 ERR (", or ] expected while parsing array"); 1013 ERR (", or ] expected while parsing array");
628 1014
629 ++dec->cur; 1015 ++dec->cur;
630 } 1016 }
631 1017
1018 DEC_DEC_DEPTH;
632 return newRV_noinc ((SV *)av); 1019 return newRV_noinc ((SV *)av);
633 1020
634fail: 1021fail:
635 SvREFCNT_dec (av); 1022 SvREFCNT_dec (av);
1023 DEC_DEC_DEPTH;
636 return 0; 1024 return 0;
637} 1025}
638 1026
639static SV * 1027static SV *
640decode_hv (dec_t *dec) 1028decode_hv (dec_t *dec)
641{ 1029{
1030 SV *sv;
642 HV *hv = newHV (); 1031 HV *hv = newHV ();
643 1032
1033 DEC_INC_DEPTH;
1034 decode_ws (dec);
1035
1036 if (*dec->cur == '}')
1037 ++dec->cur;
1038 else
644 for (;;) 1039 for (;;)
645 { 1040 {
646 SV *key, *value; 1041 decode_ws (dec); EXPECT_CH ('"');
647 1042
648 WS; EXPECT_CH ('"'); 1043 // heuristic: assume that
649 1044 // a) decode_str + hv_store_ent are abysmally slow.
650 key = decode_str (dec); 1045 // b) most hash keys are short, simple ascii text.
651 if (!key) 1046 // => try to "fast-match" such strings to avoid
652 goto fail; 1047 // the overhead of decode_str + hv_store_ent.
653
654 WS; EXPECT_CH (':');
655
656 value = decode_sv (dec);
657 if (!value)
658 { 1048 {
1049 SV *value;
1050 char *p = dec->cur;
1051 char *e = p + 24; // only try up to 24 bytes
1052
1053 for (;;)
1054 {
1055 // the >= 0x80 is true on most architectures
1056 if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
1057 {
1058 // slow path, back up and use decode_str
1059 SV *key = decode_str (dec);
1060 if (!key)
1061 goto fail;
1062
1063 decode_ws (dec); EXPECT_CH (':');
1064
1065 value = decode_sv (dec);
1066 if (!value)
1067 {
1068 SvREFCNT_dec (key);
1069 goto fail;
1070 }
1071
1072 hv_store_ent (hv, key, value, 0);
659 SvREFCNT_dec (key); 1073 SvREFCNT_dec (key);
1074
1075 break;
1076 }
1077 else if (*p == '"')
1078 {
1079 // fast path, got a simple key
1080 char *key = dec->cur;
1081 int len = p - key;
1082 dec->cur = p + 1;
1083
1084 decode_ws (dec); EXPECT_CH (':');
1085
1086 value = decode_sv (dec);
1087 if (!value)
660 goto fail; 1088 goto fail;
1089
1090 hv_store (hv, key, len, value, 0);
1091
1092 break;
1093 }
1094
1095 ++p;
1096 }
661 } 1097 }
662 1098
663 //TODO: optimise 1099 decode_ws (dec);
664 hv_store_ent (hv, key, value, 0);
665 1100
666 WS;
667
668 if (*dec->cur == '}') 1101 if (*dec->cur == '}')
1102 {
1103 ++dec->cur;
1104 break;
1105 }
1106
1107 if (*dec->cur != ',')
1108 ERR (", or } expected while parsing object/hash");
1109
1110 ++dec->cur;
1111 }
1112
1113 DEC_DEC_DEPTH;
1114 sv = newRV_noinc ((SV *)hv);
1115
1116 // check filter callbacks
1117 if (dec->json.flags & F_HOOK)
1118 {
1119 if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
669 { 1120 {
670 ++dec->cur; 1121 HE *cb, *he;
671 break; 1122
1123 hv_iterinit (hv);
1124 he = hv_iternext (hv);
1125 hv_iterinit (hv);
1126
1127 // the next line creates a mortal sv each time its called.
1128 // might want to optimise this for common cases.
1129 cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
1130
1131 if (cb)
1132 {
1133 dSP;
1134 int count;
1135
1136 ENTER; SAVETMPS; PUSHMARK (SP);
1137 XPUSHs (HeVAL (he));
1138
1139 PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
1140
1141 if (count == 1)
1142 {
1143 sv = newSVsv (POPs);
1144 FREETMPS; LEAVE;
1145 return sv;
1146 }
1147
1148 FREETMPS; LEAVE;
1149 }
672 } 1150 }
673 1151
674 if (*dec->cur != ',') 1152 if (dec->json.cb_object)
675 ERR (", or } expected while parsing object/hash"); 1153 {
1154 dSP;
1155 int count;
676 1156
677 ++dec->cur; 1157 ENTER; SAVETMPS; PUSHMARK (SP);
678 } 1158 XPUSHs (sv_2mortal (sv));
679 1159
680 return newRV_noinc ((SV *)hv); 1160 PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
1161
1162 if (count == 1)
1163 {
1164 sv = newSVsv (POPs);
1165 FREETMPS; LEAVE;
1166 return sv;
1167 }
1168
1169 SvREFCNT_inc (sv);
1170 FREETMPS; LEAVE;
1171 }
1172 }
1173
1174 return sv;
681 1175
682fail: 1176fail:
683 SvREFCNT_dec (hv); 1177 SvREFCNT_dec (hv);
1178 DEC_DEC_DEPTH;
684 return 0; 1179 return 0;
685} 1180}
686 1181
687static SV * 1182static SV *
688decode_sv (dec_t *dec) 1183decode_sv (dec_t *dec)
689{ 1184{
690 WS; 1185 decode_ws (dec);
1186
1187 // the beauty of JSON: you need exactly one character lookahead
1188 // to parse anything.
691 switch (*dec->cur) 1189 switch (*dec->cur)
692 { 1190 {
693 case '"': ++dec->cur; return decode_str (dec); 1191 case '"': ++dec->cur; return decode_str (dec);
694 case '[': ++dec->cur; return decode_av (dec); 1192 case '[': ++dec->cur; return decode_av (dec);
695 case '{': ++dec->cur; return decode_hv (dec); 1193 case '{': ++dec->cur; return decode_hv (dec);
… …
701 1199
702 case 't': 1200 case 't':
703 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4)) 1201 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
704 { 1202 {
705 dec->cur += 4; 1203 dec->cur += 4;
706 return newSViv (1); 1204 return SvREFCNT_inc (json_true);
707 } 1205 }
708 else 1206 else
709 ERR ("'true' expected"); 1207 ERR ("'true' expected");
710 1208
711 break; 1209 break;
712 1210
713 case 'f': 1211 case 'f':
714 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5)) 1212 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
715 { 1213 {
716 dec->cur += 5; 1214 dec->cur += 5;
717 return newSViv (0); 1215 return SvREFCNT_inc (json_false);
718 } 1216 }
719 else 1217 else
720 ERR ("'false' expected"); 1218 ERR ("'false' expected");
721 1219
722 break; 1220 break;
723 1221
724 case 'n': 1222 case 'n':
725 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4)) 1223 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))
726 { 1224 {
727 dec->cur += 4; 1225 dec->cur += 4;
728 return newSViv (1); 1226 return newSVsv (&PL_sv_undef);
729 } 1227 }
730 else 1228 else
731 ERR ("'null' expected"); 1229 ERR ("'null' expected");
732 1230
733 break; 1231 break;
734 1232
735 default: 1233 default:
736 ERR ("malformed json string"); 1234 ERR ("malformed JSON string, neither array, object, number, string or atom");
737 break; 1235 break;
738 } 1236 }
739 1237
740fail: 1238fail:
741 return 0; 1239 return 0;
742} 1240}
743 1241
744static SV * 1242static SV *
745decode_json (SV *string, UV flags) 1243decode_json (SV *string, JSON *json, UV *offset_return)
746{ 1244{
1245 dec_t dec;
1246 UV offset;
747 SV *sv; 1247 SV *sv;
748 1248
1249 SvGETMAGIC (string);
1250 SvUPGRADE (string, SVt_PV);
1251
1252 if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
1253 croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
1254 (unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
1255
749 if (!(flags & F_UTF8)) 1256 if (json->flags & F_UTF8)
1257 sv_utf8_downgrade (string, 0);
1258 else
750 sv_utf8_upgrade (string); 1259 sv_utf8_upgrade (string);
751 1260
752 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP 1261 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
753 1262
754 dec_t dec; 1263 dec.json = *json;
755 dec.flags = flags;
756 dec.cur = SvPVX (string); 1264 dec.cur = SvPVX (string);
757 dec.end = SvEND (string); 1265 dec.end = SvEND (string);
758 dec.err = 0; 1266 dec.err = 0;
1267 dec.depth = 0;
1268 dec.maxdepth = DEC_DEPTH (dec.json.flags);
759 1269
760 *dec.end = 1; // invalid anywhere 1270 if (dec.json.cb_object || dec.json.cb_sk_object)
1271 dec.json.flags |= F_HOOK;
1272
1273 *dec.end = 0; // this should basically be a nop, too, but make sure it's there
761 sv = decode_sv (&dec); 1274 sv = decode_sv (&dec);
762 *dec.end = 0; 1275
1276 if (!(offset_return || !sv))
1277 {
1278 // check for trailing garbage
1279 decode_ws (&dec);
1280
1281 if (*dec.cur)
1282 {
1283 dec.err = "garbage after JSON object";
1284 SvREFCNT_dec (sv);
1285 sv = 0;
1286 }
1287 }
1288
1289 if (offset_return || !sv)
1290 {
1291 offset = dec.json.flags & F_UTF8
1292 ? dec.cur - SvPVX (string)
1293 : utf8_distance (dec.cur, SvPVX (string));
1294
1295 if (offset_return)
1296 *offset_return = offset;
1297 }
763 1298
764 if (!sv) 1299 if (!sv)
765 { 1300 {
766 IV offset = utf8_distance (dec.cur, SvPVX (string));
767 SV *uni = sv_newmortal (); 1301 SV *uni = sv_newmortal ();
768 1302
1303 // horrible hack to silence warning inside pv_uni_display
1304 COP cop = *PL_curcop;
1305 cop.cop_warnings = pWARN_NONE;
1306 ENTER;
1307 SAVEVPTR (PL_curcop);
1308 PL_curcop = &cop;
769 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ); 1309 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
1310 LEAVE;
1311
770 croak ("%s, at character %d (%s)", 1312 croak ("%s, at character offset %d [\"%s\"]",
771 dec.err, 1313 dec.err,
772 (int)offset, 1314 (int)offset,
773 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)"); 1315 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
774 } 1316 }
775 1317
776 sv_dump (sv);//D
777 return sv_2mortal (sv); 1318 sv = sv_2mortal (sv);
1319
1320 if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
1321 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
1322
1323 return sv;
778} 1324}
1325
1326/////////////////////////////////////////////////////////////////////////////
1327// XS interface functions
779 1328
780MODULE = JSON::XS PACKAGE = JSON::XS 1329MODULE = JSON::XS PACKAGE = JSON::XS
781 1330
782BOOT: 1331BOOT:
783{ 1332{
784 int i; 1333 int i;
785 1334
786 memset (decode_hexdigit, 0xff, 256);
787 for (i = 10; i--; ) 1335 for (i = 0; i < 256; ++i)
788 decode_hexdigit ['0' + i] = i; 1336 decode_hexdigit [i] =
1337 i >= '0' && i <= '9' ? i - '0'
1338 : i >= 'a' && i <= 'f' ? i - 'a' + 10
1339 : i >= 'A' && i <= 'F' ? i - 'A' + 10
1340 : -1;
789 1341
790 for (i = 6; --i; ) 1342 json_stash = gv_stashpv ("JSON::XS" , 1);
1343 json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
1344
1345 json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
1346 json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
1347}
1348
1349PROTOTYPES: DISABLE
1350
1351void new (char *klass)
1352 PPCODE:
1353{
1354 SV *pv = NEWSV (0, sizeof (JSON));
1355 SvPOK_only (pv);
1356 Zero (SvPVX (pv), 1, JSON);
1357 ((JSON *)SvPVX (pv))->flags = F_DEFAULT;
1358 XPUSHs (sv_2mortal (sv_bless (newRV_noinc (pv), json_stash)));
1359}
1360
1361void ascii (JSON *self, int enable = 1)
1362 ALIAS:
1363 ascii = F_ASCII
1364 latin1 = F_LATIN1
1365 utf8 = F_UTF8
1366 indent = F_INDENT
1367 canonical = F_CANONICAL
1368 space_before = F_SPACE_BEFORE
1369 space_after = F_SPACE_AFTER
1370 pretty = F_PRETTY
1371 allow_nonref = F_ALLOW_NONREF
1372 shrink = F_SHRINK
1373 allow_blessed = F_ALLOW_BLESSED
1374 convert_blessed = F_CONV_BLESSED
1375 PPCODE:
1376{
1377 if (enable)
1378 self->flags |= ix;
1379 else
1380 self->flags &= ~ix;
1381
1382 XPUSHs (ST (0));
1383}
1384
1385void max_depth (JSON *self, UV max_depth = 0x80000000UL)
1386 PPCODE:
1387{
1388 UV log2 = 0;
1389
1390 if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
1391
1392 while ((1UL << log2) < max_depth)
1393 ++log2;
1394
1395 self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
1396
1397 XPUSHs (ST (0));
1398}
1399
1400void max_size (JSON *self, UV max_size = 0)
1401 PPCODE:
1402{
1403 UV log2 = 0;
1404
1405 if (max_size > 0x80000000UL) max_size = 0x80000000UL;
1406 if (max_size == 1) max_size = 2;
1407
1408 while ((1UL << log2) < max_size)
1409 ++log2;
1410
1411 self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
1412
1413 XPUSHs (ST (0));
1414}
1415
1416void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
1417 PPCODE:
1418{
1419 SvREFCNT_dec (self->cb_object);
1420 self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
1421
1422 XPUSHs (ST (0));
1423}
1424
1425void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
1426 PPCODE:
1427{
1428 if (!self->cb_sk_object)
1429 self->cb_sk_object = newHV ();
1430
1431 if (SvOK (cb))
1432 hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
1433 else
791 { 1434 {
792 decode_hexdigit ['a' + i] = 10 + i; 1435 hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
793 decode_hexdigit ['A' + i] = 10 + i; 1436
1437 if (!HvKEYS (self->cb_sk_object))
1438 {
1439 SvREFCNT_dec (self->cb_sk_object);
1440 self->cb_sk_object = 0;
1441 }
794 } 1442 }
795 1443
796 json_stash = gv_stashpv ("JSON::XS", 1); 1444 XPUSHs (ST (0));
797} 1445}
798 1446
799SV *new (char *dummy) 1447void encode (JSON *self, SV *scalar)
1448 PPCODE:
1449 XPUSHs (encode_json (scalar, self));
1450
1451void decode (JSON *self, SV *jsonstr)
1452 PPCODE:
1453 XPUSHs (decode_json (jsonstr, self, 0));
1454
1455void decode_prefix (JSON *self, SV *jsonstr)
1456 PPCODE:
1457{
1458 UV offset;
1459 EXTEND (SP, 2);
1460 PUSHs (decode_json (jsonstr, self, &offset));
1461 PUSHs (sv_2mortal (newSVuv (offset)));
1462}
1463
1464void DESTROY (JSON *self)
800 CODE: 1465 CODE:
801 RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash); 1466 SvREFCNT_dec (self->cb_sk_object);
802 OUTPUT: 1467 SvREFCNT_dec (self->cb_object);
803 RETVAL
804 1468
805SV *ascii (SV *self, int enable) 1469PROTOTYPES: ENABLE
806 ALIAS:
807 ascii = F_ASCII
808 utf8 = F_UTF8
809 indent = F_INDENT
810 canonical = F_CANONICAL
811 space_before = F_SPACE_BEFORE
812 space_after = F_SPACE_AFTER
813 json_rpc = F_JSON_RPC
814 CODE:
815{
816 UV *uv = SvJSON (self);
817 if (enable)
818 *uv |= ix;
819 else
820 *uv &= ~ix;
821 1470
822 RETVAL = newSVsv (self); 1471void to_json (SV *scalar)
823}
824 OUTPUT:
825 RETVAL
826
827void encode (SV *self, SV *scalar)
828 PPCODE: 1472 PPCODE:
1473{
1474 JSON json = { F_DEFAULT | F_UTF8 };
829 XPUSHs (encode_json (scalar, *SvJSON (self))); 1475 XPUSHs (encode_json (scalar, &json));
1476}
830 1477
831void decode (SV *self, SV *jsondata) 1478void from_json (SV *jsonstr)
832 PPCODE: 1479 PPCODE:
1480{
1481 JSON json = { F_DEFAULT | F_UTF8 };
833 XPUSHs (decode_json (jsondata, *SvJSON (self))); 1482 XPUSHs (decode_json (jsonstr, &json, 0));
1483}
834 1484

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines