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Comparing JSON-XS/XS.xs (file contents):
Revision 1.3 by root, Thu Mar 22 18:10:29 2007 UTC vs.
Revision 1.49 by root, Sun Jul 1 23:40:07 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
16#define F_ALLOW_NONREF 0x00000080 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
36
37#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
38#define DEC_SIZE(flags) (1UL << ((flags & F_MAXSIZE ) >> S_MAXSIZE ))
17 39
18#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER 40#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
19#define F_DEFAULT 0 41#define F_DEFAULT (9UL << S_MAXDEPTH)
20 42
21#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
22 47
23#define SB do { 48#define SB do {
24#define SE } while (0) 49#define SE } while (0)
25 50
26static 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, *cb_sk_object;
68} JSON;
69
70/////////////////////////////////////////////////////////////////////////////
71// utility functions
72
73inline void
74shrink (SV *sv)
75{
76 sv_utf8_downgrade (sv, 1);
77 if (SvLEN (sv) > SvCUR (sv) + 1)
78 {
79#ifdef SvPV_shrink_to_cur
80 SvPV_shrink_to_cur (sv);
81#elif defined (SvPV_renew)
82 SvPV_renew (sv, SvCUR (sv) + 1);
83#endif
84 }
85}
86
87// decode an utf-8 character and return it, or (UV)-1 in
88// case of an error.
89// we special-case "safe" characters from U+80 .. U+7FF,
90// but use the very good perl function to parse anything else.
91// note that we never call this function for a ascii codepoints
92inline UV
93decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
94{
95 if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
96 return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
97 else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
98 {
99 *clen = 2;
100 return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
101 }
102 else
103 {
104 *clen = (STRLEN)-1;
105 return (UV)-1;
106 }
107}
108
109/////////////////////////////////////////////////////////////////////////////
110// encoder
27 111
28// structure used for encoding JSON 112// structure used for encoding JSON
29typedef struct 113typedef struct
30{ 114{
31 char *cur; 115 char *cur; // SvPVX (sv) + current output position
32 STRLEN len; // SvLEN (sv)
33 char *end; // SvEND (sv) 116 char *end; // SvEND (sv)
34 SV *sv; 117 SV *sv; // result scalar
35 UV flags; 118 JSON json;
36 int max_recurse; 119 U32 indent; // indentation level
37 int indent; 120 U32 maxdepth; // max. indentation/recursion level
38} enc_t; 121} enc_t;
39 122
40// structure used for decoding JSON 123inline void
41typedef struct
42{
43 char *cur;
44 char *end;
45 char *err;
46 UV flags;
47} dec_t;
48
49static UV *
50SvJSON (SV *sv)
51{
52 if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
53 croak ("object is not of type JSON::XS");
54
55 return &SvUVX (SvRV (sv));
56}
57
58/////////////////////////////////////////////////////////////////////////////
59
60static void
61need (enc_t *enc, STRLEN len) 124need (enc_t *enc, STRLEN len)
62{ 125{
63 if (enc->cur + len >= enc->end) 126 if (expect_false (enc->cur + len >= enc->end))
64 { 127 {
65 STRLEN cur = enc->cur - SvPVX (enc->sv); 128 STRLEN cur = enc->cur - SvPVX (enc->sv);
66 SvGROW (enc->sv, cur + len + 1); 129 SvGROW (enc->sv, cur + len + 1);
67 enc->cur = SvPVX (enc->sv) + cur; 130 enc->cur = SvPVX (enc->sv) + cur;
68 enc->end = SvEND (enc->sv); 131 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
69 } 132 }
70} 133}
71 134
72static void 135inline void
73encode_ch (enc_t *enc, char ch) 136encode_ch (enc_t *enc, char ch)
74{ 137{
75 need (enc, 1); 138 need (enc, 1);
76 *enc->cur++ = ch; 139 *enc->cur++ = ch;
77} 140}
… …
79static void 142static void
80encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8) 143encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8)
81{ 144{
82 char *end = str + len; 145 char *end = str + len;
83 146
147 need (enc, len);
148
84 while (str < end) 149 while (str < end)
85 { 150 {
86 unsigned char ch = *(unsigned char *)str; 151 unsigned char ch = *(unsigned char *)str;
152
87 if (ch >= 0x20 && ch < 0x80) // most common case 153 if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
88 { 154 {
155 if (expect_false (ch == '"')) // but with slow exceptions
156 {
157 need (enc, len += 1);
158 *enc->cur++ = '\\';
159 *enc->cur++ = '"';
160 }
161 else if (expect_false (ch == '\\'))
162 {
163 need (enc, len += 1);
164 *enc->cur++ = '\\';
165 *enc->cur++ = '\\';
166 }
167 else
89 *enc->cur++ = ch; 168 *enc->cur++ = ch;
169
90 str++; 170 ++str;
91 } 171 }
92 else 172 else
93 { 173 {
94 STRLEN clen; 174 switch (ch)
95 UV uch;
96
97 if (is_utf8)
98 { 175 {
99 uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY); 176 case '\010': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
100 if (clen < 0) 177 case '\011': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
101 croak ("malformed UTF-8 character in string, cannot convert to JSON"); 178 case '\012': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
102 } 179 case '\014': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
103 else 180 case '\015': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
104 {
105 uch = ch;
106 clen = 1;
107 }
108 181
109 need (enc, len += 6); 182 default:
110
111 if (uch < 0xa0 || enc->flags & F_ASCII)
112 {
113 if (uch > 0xFFFFUL)
114 { 183 {
184 STRLEN clen;
185 UV uch;
186
187 if (is_utf8)
188 {
189 uch = decode_utf8 (str, end - str, &clen);
190 if (clen == (STRLEN)-1)
191 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
192 }
193 else
194 {
195 uch = ch;
115 len += 6; 196 clen = 1;
197 }
198
199 if (uch > 0x10FFFFUL)
200 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
201
202 if (uch < 0x80 || enc->json.flags & F_ASCII || (enc->json.flags & F_LATIN1 && uch > 0xFF))
203 {
204 if (uch > 0xFFFFUL)
205 {
116 need (enc, len += 6); 206 need (enc, len += 11);
117 sprintf (enc->cur, "\\u%04x\\u%04x", 207 sprintf (enc->cur, "\\u%04x\\u%04x",
118 (uch - 0x10000) / 0x400 + 0xD800, 208 (int)((uch - 0x10000) / 0x400 + 0xD800),
119 (uch - 0x10000) % 0x400 + 0xDC00); 209 (int)((uch - 0x10000) % 0x400 + 0xDC00));
120 enc->cur += 12; 210 enc->cur += 12;
211 }
212 else
213 {
214 static char hexdigit [16] = "0123456789abcdef";
215 need (enc, len += 5);
216 *enc->cur++ = '\\';
217 *enc->cur++ = 'u';
218 *enc->cur++ = hexdigit [ uch >> 12 ];
219 *enc->cur++ = hexdigit [(uch >> 8) & 15];
220 *enc->cur++ = hexdigit [(uch >> 4) & 15];
221 *enc->cur++ = hexdigit [(uch >> 0) & 15];
222 }
223
224 str += clen;
121 } 225 }
226 else if (enc->json.flags & F_LATIN1)
227 {
228 *enc->cur++ = uch;
229 str += clen;
230 }
231 else if (is_utf8)
232 {
233 need (enc, len += clen);
234 do
235 {
236 *enc->cur++ = *str++;
237 }
238 while (--clen);
239 }
122 else 240 else
123 { 241 {
124 sprintf (enc->cur, "\\u%04x", uch); 242 need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
125 enc->cur += 6; 243 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
244 ++str;
245 }
126 } 246 }
127 } 247 }
128 else if (is_utf8)
129 {
130 memcpy (enc->cur, str, clen);
131 enc->cur += clen;
132 }
133 else
134 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
135
136 str += clen;
137 } 248 }
138 249
139 --len; 250 --len;
140 } 251 }
141} 252}
142 253
143#define INDENT SB \ 254inline void
255encode_indent (enc_t *enc)
256{
144 if (enc->flags & F_INDENT) \ 257 if (enc->json.flags & F_INDENT)
145 { \ 258 {
146 int i_; \ 259 int spaces = enc->indent * INDENT_STEP;
147 need (enc, enc->indent); \ 260
148 for (i_ = enc->indent * 3; i_--; )\ 261 need (enc, spaces);
262 memset (enc->cur, ' ', spaces);
263 enc->cur += spaces;
264 }
265}
266
267inline void
268encode_space (enc_t *enc)
269{
270 need (enc, 1);
271 encode_ch (enc, ' ');
272}
273
274inline void
275encode_nl (enc_t *enc)
276{
277 if (enc->json.flags & F_INDENT)
278 {
279 need (enc, 1);
149 encode_ch (enc, ' '); \ 280 encode_ch (enc, '\n');
150 } \ 281 }
151 SE 282}
152 283
153#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE 284inline void
154#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE 285encode_comma (enc_t *enc)
155#define COMMA SB \ 286{
156 encode_ch (enc, ','); \ 287 encode_ch (enc, ',');
288
157 if (enc->flags & F_INDENT) \ 289 if (enc->json.flags & F_INDENT)
158 NL; \ 290 encode_nl (enc);
159 else if (enc->flags & F_SPACE_AFTER) \ 291 else if (enc->json.flags & F_SPACE_AFTER)
160 SPACE; \ 292 encode_space (enc);
161 SE 293}
162 294
163static void encode_sv (enc_t *enc, SV *sv); 295static void encode_sv (enc_t *enc, SV *sv);
164 296
165static void 297static void
166encode_av (enc_t *enc, AV *av) 298encode_av (enc_t *enc, AV *av)
167{ 299{
168 int i, len = av_len (av); 300 int i, len = av_len (av);
169 301
170 encode_ch (enc, '['); NL; 302 if (enc->indent >= enc->maxdepth)
303 croak ("data structure too deep (hit recursion limit)");
304
305 encode_ch (enc, '['); encode_nl (enc);
171 ++enc->indent; 306 ++enc->indent;
172 307
173 for (i = 0; i <= len; ++i) 308 for (i = 0; i <= len; ++i)
174 { 309 {
175 INDENT; 310 encode_indent (enc);
176 encode_sv (enc, *av_fetch (av, i, 0)); 311 encode_sv (enc, *av_fetch (av, i, 0));
177 312
178 if (i < len) 313 if (i < len)
179 COMMA; 314 encode_comma (enc);
180 } 315 }
181 316
182 NL; 317 encode_nl (enc);
183 318
184 --enc->indent; 319 --enc->indent;
185 INDENT; encode_ch (enc, ']'); 320 encode_indent (enc); encode_ch (enc, ']');
186} 321}
187 322
188static void 323static void
189encode_he (enc_t *enc, HE *he) 324encode_he (enc_t *enc, HE *he)
190{ 325{
… …
192 327
193 if (HeKLEN (he) == HEf_SVKEY) 328 if (HeKLEN (he) == HEf_SVKEY)
194 { 329 {
195 SV *sv = HeSVKEY (he); 330 SV *sv = HeSVKEY (he);
196 STRLEN len; 331 STRLEN len;
332 char *str;
333
334 SvGETMAGIC (sv);
197 char *str = SvPV (sv, len); 335 str = SvPV (sv, len);
198 336
199 encode_str (enc, str, len, SvUTF8 (sv)); 337 encode_str (enc, str, len, SvUTF8 (sv));
200 } 338 }
201 else 339 else
202 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he)); 340 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
203 341
204 encode_ch (enc, '"'); 342 encode_ch (enc, '"');
205 343
206 if (enc->flags & F_SPACE_BEFORE) SPACE; 344 if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
207 encode_ch (enc, ':'); 345 encode_ch (enc, ':');
208 if (enc->flags & F_SPACE_AFTER ) SPACE; 346 if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
209 encode_sv (enc, HeVAL (he)); 347 encode_sv (enc, HeVAL (he));
210} 348}
211 349
212// compare hash entries, used when all keys are bytestrings 350// compare hash entries, used when all keys are bytestrings
213static int 351static int
… …
219 HE *b = *(HE **)b_; 357 HE *b = *(HE **)b_;
220 358
221 STRLEN la = HeKLEN (a); 359 STRLEN la = HeKLEN (a);
222 STRLEN lb = HeKLEN (b); 360 STRLEN lb = HeKLEN (b);
223 361
224 if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb))) 362 if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))
225 cmp = la < lb ? -1 : la == lb ? 0 : 1; 363 cmp = la - lb;
226 364
227 return cmp; 365 return cmp;
228} 366}
229 367
230// compare hash entries, used when some keys are sv's or utf-x 368// compare hash entries, used when some keys are sv's or utf-x
… …
237static void 375static void
238encode_hv (enc_t *enc, HV *hv) 376encode_hv (enc_t *enc, HV *hv)
239{ 377{
240 int count, i; 378 int count, i;
241 379
380 if (enc->indent >= enc->maxdepth)
381 croak ("data structure too deep (hit recursion limit)");
382
242 encode_ch (enc, '{'); NL; ++enc->indent; 383 encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
243 384
244 if ((count = hv_iterinit (hv))) 385 if ((count = hv_iterinit (hv)))
245 { 386 {
246 // for canonical output we have to sort by keys first 387 // for canonical output we have to sort by keys first
247 // actually, this is mostly due to the stupid so-called 388 // actually, this is mostly due to the stupid so-called
248 // security workaround added somewhere in 5.8.x. 389 // security workaround added somewhere in 5.8.x.
249 // that randomises hash orderings 390 // that randomises hash orderings
250 if (enc->flags & F_CANONICAL) 391 if (enc->json.flags & F_CANONICAL)
251 { 392 {
252 HE *he, *hes [count];
253 int fast = 1; 393 int fast = 1;
394 HE *he;
395#if defined(__BORLANDC__) || defined(_MSC_VER)
396 HE **hes = _alloca (count * sizeof (HE));
397#else
398 HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
399#endif
254 400
255 i = 0; 401 i = 0;
256 while ((he = hv_iternext (hv))) 402 while ((he = hv_iternext (hv)))
257 { 403 {
258 hes [i++] = he; 404 hes [i++] = he;
… …
264 410
265 if (fast) 411 if (fast)
266 qsort (hes, count, sizeof (HE *), he_cmp_fast); 412 qsort (hes, count, sizeof (HE *), he_cmp_fast);
267 else 413 else
268 { 414 {
269 // hack to disable "use bytes" 415 // hack to forcefully disable "use bytes"
270 COP *oldcop = PL_curcop, cop; 416 COP cop = *PL_curcop;
271 cop.op_private = 0; 417 cop.op_private = 0;
418
419 ENTER;
420 SAVETMPS;
421
422 SAVEVPTR (PL_curcop);
272 PL_curcop = &cop; 423 PL_curcop = &cop;
273 424
274 SAVETMPS;
275 qsort (hes, count, sizeof (HE *), he_cmp_slow); 425 qsort (hes, count, sizeof (HE *), he_cmp_slow);
426
276 FREETMPS; 427 FREETMPS;
277 428 LEAVE;
278 PL_curcop = oldcop;
279 } 429 }
280 430
281 for (i = 0; i < count; ++i) 431 for (i = 0; i < count; ++i)
282 { 432 {
283 INDENT; 433 encode_indent (enc);
284 encode_he (enc, hes [i]); 434 encode_he (enc, hes [i]);
285 435
286 if (i < count - 1) 436 if (i < count - 1)
287 COMMA; 437 encode_comma (enc);
288 } 438 }
289 439
290 NL; 440 encode_nl (enc);
291 } 441 }
292 else 442 else
293 { 443 {
294 SV *sv;
295 HE *he = hv_iternext (hv); 444 HE *he = hv_iternext (hv);
296 445
297 for (;;) 446 for (;;)
298 { 447 {
299 INDENT; 448 encode_indent (enc);
300 encode_he (enc, he); 449 encode_he (enc, he);
301 450
302 if (!(he = hv_iternext (hv))) 451 if (!(he = hv_iternext (hv)))
303 break; 452 break;
304 453
305 COMMA; 454 encode_comma (enc);
306 } 455 }
307 456
308 NL; 457 encode_nl (enc);
309 } 458 }
310 } 459 }
311 460
312 --enc->indent; INDENT; encode_ch (enc, '}'); 461 --enc->indent; encode_indent (enc); encode_ch (enc, '}');
462}
463
464// encode objects, arrays and special \0=false and \1=true values.
465static void
466encode_rv (enc_t *enc, SV *sv)
467{
468 svtype svt;
469
470 SvGETMAGIC (sv);
471 svt = SvTYPE (sv);
472
473 if (expect_false (SvOBJECT (sv)))
474 {
475 if (SvSTASH (sv) == json_boolean_stash)
476 {
477 if (SvIV (sv) == 0)
478 encode_str (enc, "false", 5, 0);
479 else
480 encode_str (enc, "true", 4, 0);
481 }
482 else
483 {
484#if 0
485 if (0 && sv_derived_from (rv, "JSON::Literal"))
486 {
487 // not yet
488 }
489#endif
490 if (enc->json.flags & F_CONV_BLESSED)
491 {
492 // we re-bless the reference to get overload and other niceties right
493 GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 1);
494
495 if (to_json)
496 {
497 dSP; ENTER; SAVETMPS; PUSHMARK (SP);
498 XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
499
500 // calling with G_SCALAR ensures that we always get a 1 reutrn value
501 // check anyways.
502 PUTBACK;
503 assert (1 == call_sv ((SV *)GvCV (to_json), G_SCALAR));
504 SPAGAIN;
505
506 encode_sv (enc, POPs);
507
508 FREETMPS; LEAVE;
509 }
510 else if (enc->json.flags & F_ALLOW_BLESSED)
511 encode_str (enc, "null", 4, 0);
512 else
513 croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
514 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
515 }
516 else if (enc->json.flags & F_ALLOW_BLESSED)
517 encode_str (enc, "null", 4, 0);
518 else
519 croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
520 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
521 }
522 }
523 else if (svt == SVt_PVHV)
524 encode_hv (enc, (HV *)sv);
525 else if (svt == SVt_PVAV)
526 encode_av (enc, (AV *)sv);
527 else if (svt < SVt_PVAV)
528 {
529 if (SvNIOK (sv) && SvIV (sv) == 0)
530 encode_str (enc, "false", 5, 0);
531 else if (SvNIOK (sv) && SvIV (sv) == 1)
532 encode_str (enc, "true", 4, 0);
533 else
534 croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
535 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
536 }
537 else
538 croak ("encountered %s, but JSON can only represent references to arrays or hashes",
539 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
313} 540}
314 541
315static void 542static void
316encode_sv (enc_t *enc, SV *sv) 543encode_sv (enc_t *enc, SV *sv)
317{ 544{
545 SvGETMAGIC (sv);
546
318 if (SvPOKp (sv)) 547 if (SvPOKp (sv))
319 { 548 {
320 STRLEN len; 549 STRLEN len;
321 char *str = SvPV (sv, len); 550 char *str = SvPV (sv, len);
322 encode_ch (enc, '"'); 551 encode_ch (enc, '"');
323 encode_str (enc, str, len, SvUTF8 (sv)); 552 encode_str (enc, str, len, SvUTF8 (sv));
324 encode_ch (enc, '"'); 553 encode_ch (enc, '"');
325 } 554 }
326 else if (SvNOKp (sv)) 555 else if (SvNOKp (sv))
327 { 556 {
557 // trust that perl will do the right thing w.r.t. JSON syntax.
328 need (enc, NV_DIG + 32); 558 need (enc, NV_DIG + 32);
329 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 559 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
330 enc->cur += strlen (enc->cur); 560 enc->cur += strlen (enc->cur);
331 } 561 }
332 else if (SvIOKp (sv)) 562 else if (SvIOKp (sv))
333 { 563 {
334 need (enc, 64); 564 // we assume we can always read an IV as a UV
565 if (SvUV (sv) & ~(UV)0x7fff)
566 {
567 // large integer, use the (rather slow) snprintf way.
568 need (enc, sizeof (UV) * 3);
335 enc->cur += 569 enc->cur +=
336 SvIsUV(sv) 570 SvIsUV(sv)
337 ? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv)) 571 ? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
338 : snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv)); 572 : snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
573 }
574 else
575 {
576 // optimise the "small number case"
577 // code will likely be branchless and use only a single multiplication
578 I32 i = SvIV (sv);
579 U32 u;
580 char digit, nz = 0;
581
582 need (enc, 6);
583
584 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
585 u = i < 0 ? -i : i;
586
587 // convert to 4.28 fixed-point representation
588 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
589
590 // now output digit by digit, each time masking out the integer part
591 // and multiplying by 5 while moving the decimal point one to the right,
592 // resulting in a net multiplication by 10.
593 // we always write the digit to memory but conditionally increment
594 // the pointer, to ease the usage of conditional move instructions.
595 digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
596 digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
597 digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
598 digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
599 digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
600 }
339 } 601 }
340 else if (SvROK (sv)) 602 else if (SvROK (sv))
341 { 603 encode_rv (enc, SvRV (sv));
342 if (!--enc->max_recurse)
343 croak ("data structure too deep (hit recursion limit)");
344
345 sv = SvRV (sv);
346
347 switch (SvTYPE (sv))
348 {
349 case SVt_PVAV: encode_av (enc, (AV *)sv); break;
350 case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
351
352 default:
353 croak ("JSON can only represent references to arrays or hashes");
354 }
355 }
356 else if (!SvOK (sv)) 604 else if (!SvOK (sv))
357 encode_str (enc, "null", 4, 0); 605 encode_str (enc, "null", 4, 0);
358 else 606 else
359 croak ("encountered perl type that JSON cannot handle"); 607 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
608 SvPV_nolen (sv), SvFLAGS (sv));
360} 609}
361 610
362static SV * 611static SV *
363encode_json (SV *scalar, UV flags) 612encode_json (SV *scalar, JSON *json)
364{ 613{
365 if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))
366 croak ("hash- or arraref required (not a simple scalar, use allow_nonref to allow this)");
367
368 enc_t enc; 614 enc_t enc;
369 enc.flags = flags; 615
616 if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
617 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
618
619 enc.json = *json;
370 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE)); 620 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
371 enc.cur = SvPVX (enc.sv); 621 enc.cur = SvPVX (enc.sv);
372 enc.end = SvEND (enc.sv); 622 enc.end = SvEND (enc.sv);
373 enc.max_recurse = 0;
374 enc.indent = 0; 623 enc.indent = 0;
624 enc.maxdepth = DEC_DEPTH (enc.json.flags);
375 625
376 SvPOK_only (enc.sv); 626 SvPOK_only (enc.sv);
377 encode_sv (&enc, scalar); 627 encode_sv (&enc, scalar);
378 628
629 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
630 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
631
379 if (!(flags & (F_ASCII | F_UTF8))) 632 if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
380 SvUTF8_on (enc.sv); 633 SvUTF8_on (enc.sv);
381 634
382 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv)); 635 if (enc.json.flags & F_SHRINK)
636 shrink (enc.sv);
637
383 return enc.sv; 638 return enc.sv;
384} 639}
385 640
386///////////////////////////////////////////////////////////////////////////// 641/////////////////////////////////////////////////////////////////////////////
642// decoder
387 643
388#define WS \ 644// structure used for decoding JSON
645typedef struct
646{
647 char *cur; // current parser pointer
648 char *end; // end of input string
649 const char *err; // parse error, if != 0
650 JSON json;
651 U32 depth; // recursion depth
652 U32 maxdepth; // recursion depth limit
653} dec_t;
654
655inline void
656decode_ws (dec_t *dec)
657{
389 for (;;) \ 658 for (;;)
390 { \ 659 {
391 char ch = *dec->cur; \ 660 char ch = *dec->cur;
661
392 if (ch > 0x20 \ 662 if (ch > 0x20
393 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \ 663 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
394 break; \ 664 break;
665
395 ++dec->cur; \ 666 ++dec->cur;
396 } 667 }
668}
397 669
398#define ERR(reason) SB dec->err = reason; goto fail; SE 670#define ERR(reason) SB dec->err = reason; goto fail; SE
671
399#define EXPECT_CH(ch) SB \ 672#define EXPECT_CH(ch) SB \
400 if (*dec->cur != ch) \ 673 if (*dec->cur != ch) \
401 ERR (# ch " expected"); \ 674 ERR (# ch " expected"); \
402 ++dec->cur; \ 675 ++dec->cur; \
403 SE 676 SE
404 677
678#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
679#define DEC_DEC_DEPTH --dec->depth
680
405static SV *decode_sv (dec_t *dec); 681static SV *decode_sv (dec_t *dec);
406
407#define APPEND_CH(ch) SB \
408 SvGROW (sv, cur + 1 + 1); \
409 SvPVX (sv)[cur++] = (ch); \
410 SE
411 682
412static signed char decode_hexdigit[256]; 683static signed char decode_hexdigit[256];
413 684
414static UV 685static UV
415decode_4hex (dec_t *dec) 686decode_4hex (dec_t *dec)
416{ 687{
417 signed char d1, d2, d3, d4; 688 signed char d1, d2, d3, d4;
689 unsigned char *cur = (unsigned char *)dec->cur;
418 690
419 d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]]; 691 d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
420 if (d1 < 0) ERR ("four hexadecimal digits expected"); 692 d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
421 d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]]; 693 d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
422 if (d2 < 0) ERR ("four hexadecimal digits expected"); 694 d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
423 d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
424 if (d3 < 0) ERR ("four hexadecimal digits expected");
425 d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
426 if (d4 < 0) ERR ("four hexadecimal digits expected");
427 695
428 dec->cur += 4; 696 dec->cur += 4;
429 697
430 return ((UV)d1) << 12 698 return ((UV)d1) << 12
431 | ((UV)d2) << 8 699 | ((UV)d2) << 8
… …
437} 705}
438 706
439static SV * 707static SV *
440decode_str (dec_t *dec) 708decode_str (dec_t *dec)
441{ 709{
442 SV *sv = NEWSV (0,2); 710 SV *sv = 0;
443 STRLEN cur = 0;
444 int utf8 = 0; 711 int utf8 = 0;
712 char *dec_cur = dec->cur;
445 713
446 for (;;) 714 do
447 { 715 {
448 unsigned char ch = *(unsigned char *)dec->cur; 716 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
717 char *cur = buf;
449 718
450 if (ch == '"') 719 do
451 break;
452 else if (ch == '\\')
453 { 720 {
454 switch (*++dec->cur) 721 unsigned char ch = *(unsigned char *)dec_cur++;
722
723 if (expect_false (ch == '"'))
455 { 724 {
456 case '\\': 725 --dec_cur;
457 case '/': 726 break;
458 case '"': APPEND_CH (*dec->cur++); break; 727 }
459 728 else if (expect_false (ch == '\\'))
460 case 'b': APPEND_CH ('\010'); ++dec->cur; break; 729 {
461 case 't': APPEND_CH ('\011'); ++dec->cur; break; 730 switch (*dec_cur)
462 case 'n': APPEND_CH ('\012'); ++dec->cur; break;
463 case 'f': APPEND_CH ('\014'); ++dec->cur; break;
464 case 'r': APPEND_CH ('\015'); ++dec->cur; break;
465
466 case 'u':
467 { 731 {
468 UV lo, hi; 732 case '\\':
469 ++dec->cur; 733 case '/':
734 case '"': *cur++ = *dec_cur++; break;
470 735
471 hi = decode_4hex (dec); 736 case 'b': ++dec_cur; *cur++ = '\010'; break;
472 if (hi == (UV)-1) 737 case 't': ++dec_cur; *cur++ = '\011'; break;
473 goto fail; 738 case 'n': ++dec_cur; *cur++ = '\012'; break;
739 case 'f': ++dec_cur; *cur++ = '\014'; break;
740 case 'r': ++dec_cur; *cur++ = '\015'; break;
474 741
475 // possibly a surrogate pair 742 case 'u':
476 if (hi >= 0xd800 && hi < 0xdc00)
477 { 743 {
478 if (dec->cur [0] != '\\' || dec->cur [1] != 'u') 744 UV lo, hi;
479 ERR ("illegal surrogate character"); 745 ++dec_cur;
480 746
481 dec->cur += 2; 747 dec->cur = dec_cur;
482
483 lo = decode_4hex (dec); 748 hi = decode_4hex (dec);
749 dec_cur = dec->cur;
484 if (lo == (UV)-1) 750 if (hi == (UV)-1)
485 goto fail; 751 goto fail;
486 752
753 // possibly a surrogate pair
754 if (hi >= 0xd800)
755 if (hi < 0xdc00)
756 {
757 if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
758 ERR ("missing low surrogate character in surrogate pair");
759
760 dec_cur += 2;
761
762 dec->cur = dec_cur;
763 lo = decode_4hex (dec);
764 dec_cur = dec->cur;
765 if (lo == (UV)-1)
766 goto fail;
767
487 if (lo < 0xdc00 || lo >= 0xe000) 768 if (lo < 0xdc00 || lo >= 0xe000)
488 ERR ("surrogate pair expected"); 769 ERR ("surrogate pair expected");
489 770
490 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; 771 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
772 }
773 else if (hi < 0xe000)
774 ERR ("missing high surrogate character in surrogate pair");
775
776 if (hi >= 0x80)
777 {
778 utf8 = 1;
779
780 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
781 }
782 else
783 *cur++ = hi;
491 } 784 }
492 else if (lo >= 0xdc00 && lo < 0xe000)
493 ERR ("illegal surrogate character");
494
495 if (hi >= 0x80)
496 { 785 break;
497 utf8 = 1;
498 786
499 SvGROW (sv, cur + 4 + 1); // at most 4 bytes for 21 bits
500 cur = (char *)uvuni_to_utf8_flags (SvPVX (sv) + cur, hi, 0) - SvPVX (sv);
501 }
502 else 787 default:
503 APPEND_CH (hi); 788 --dec_cur;
789 ERR ("illegal backslash escape sequence in string");
504 } 790 }
791 }
792 else if (expect_true (ch >= 0x20 && ch <= 0x7f))
793 *cur++ = ch;
794 else if (ch >= 0x80)
795 {
796 STRLEN clen;
797 UV uch;
798
799 --dec_cur;
800
801 uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
802 if (clen == (STRLEN)-1)
803 ERR ("malformed UTF-8 character in JSON string");
804
805 do
806 *cur++ = *dec_cur++;
807 while (--clen);
808
809 utf8 = 1;
810 }
811 else
812 {
813 --dec_cur;
814
815 if (!ch)
816 ERR ("unexpected end of string while parsing JSON string");
505 break; 817 else
818 ERR ("invalid character encountered while parsing JSON string");
506 } 819 }
507 } 820 }
508 else if (ch >= 0x20 && ch <= 0x7f) 821 while (cur < buf + SHORT_STRING_LEN);
509 APPEND_CH (*dec->cur++); 822
510 else if (ch >= 0x80) 823 {
824 STRLEN len = cur - buf;
825
826 if (sv)
511 { 827 {
512 STRLEN clen; 828 SvGROW (sv, SvCUR (sv) + len + 1);
513 UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY); 829 memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
514 if (clen < 0) 830 SvCUR_set (sv, SvCUR (sv) + len);
515 ERR ("malformed UTF-8 character in string, cannot convert to JSON");
516
517 SvGROW (sv, cur + clen + 1); // at most 4 bytes for 21 bits
518 memcpy (SvPVX (sv) + cur, dec->cur, clen);
519 dec->cur += clen;
520 } 831 }
521 else 832 else
522 ERR ("invalid character encountered"); 833 sv = newSVpvn (buf, len);
523 } 834 }
835 }
836 while (*dec_cur != '"');
524 837
525 ++dec->cur; 838 ++dec_cur;
526 839
840 if (sv)
841 {
527 SvPOK_only (sv); 842 SvPOK_only (sv);
528
529 SvCUR_set (sv, cur);
530 *SvEND (sv) = 0; 843 *SvEND (sv) = 0;
531 844
532 if (utf8) 845 if (utf8)
533 SvUTF8_on (sv); 846 SvUTF8_on (sv);
847 }
848 else
849 sv = newSVpvn ("", 0);
534 850
851 dec->cur = dec_cur;
535 return sv; 852 return sv;
536 853
537fail: 854fail:
538 SvREFCNT_dec (sv); 855 dec->cur = dec_cur;
539 return 0; 856 return 0;
540} 857}
541 858
542static SV * 859static SV *
543decode_num (dec_t *dec) 860decode_num (dec_t *dec)
… …
553 { 870 {
554 ++dec->cur; 871 ++dec->cur;
555 if (*dec->cur >= '0' && *dec->cur <= '9') 872 if (*dec->cur >= '0' && *dec->cur <= '9')
556 ERR ("malformed number (leading zero must not be followed by another digit)"); 873 ERR ("malformed number (leading zero must not be followed by another digit)");
557 } 874 }
558 875 else if (*dec->cur < '0' || *dec->cur > '9')
559 // int 876 ERR ("malformed number (no digits after initial minus)");
877 else
878 do
879 {
880 ++dec->cur;
881 }
560 while (*dec->cur >= '0' && *dec->cur <= '9') 882 while (*dec->cur >= '0' && *dec->cur <= '9');
561 ++dec->cur;
562 883
563 // [frac] 884 // [frac]
564 if (*dec->cur == '.') 885 if (*dec->cur == '.')
565 { 886 {
566 is_nv = 1; 887 ++dec->cur;
888
889 if (*dec->cur < '0' || *dec->cur > '9')
890 ERR ("malformed number (no digits after decimal point)");
567 891
568 do 892 do
569 { 893 {
570 ++dec->cur; 894 ++dec->cur;
571 } 895 }
572 while (*dec->cur >= '0' && *dec->cur <= '9'); 896 while (*dec->cur >= '0' && *dec->cur <= '9');
897
898 is_nv = 1;
573 } 899 }
574 900
575 // [exp] 901 // [exp]
576 if (*dec->cur == 'e' || *dec->cur == 'E') 902 if (*dec->cur == 'e' || *dec->cur == 'E')
577 { 903 {
578 is_nv = 1;
579
580 ++dec->cur; 904 ++dec->cur;
905
581 if (*dec->cur == '-' || *dec->cur == '+') 906 if (*dec->cur == '-' || *dec->cur == '+')
582 ++dec->cur; 907 ++dec->cur;
583 908
909 if (*dec->cur < '0' || *dec->cur > '9')
910 ERR ("malformed number (no digits after exp sign)");
911
912 do
913 {
914 ++dec->cur;
915 }
584 while (*dec->cur >= '0' && *dec->cur <= '9') 916 while (*dec->cur >= '0' && *dec->cur <= '9');
585 ++dec->cur; 917
918 is_nv = 1;
586 } 919 }
587 920
588 if (!is_nv) 921 if (!is_nv)
589 { 922 {
590 UV uv; 923 // special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
591 int numtype = grok_number (start, dec->cur - start, &uv); 924 if (*start == '-')
592 if (numtype & IS_NUMBER_IN_UV) 925 switch (dec->cur - start)
593 if (numtype & IS_NUMBER_NEG)
594 { 926 {
595 if (uv < (UV)IV_MIN) 927 case 2: return newSViv (-( start [1] - '0' * 1));
596 return newSViv (-(IV)uv); 928 case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
929 case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
930 case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
597 } 931 }
932 else
933 switch (dec->cur - start)
934 {
935 case 1: return newSViv ( start [0] - '0' * 1);
936 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
937 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
938 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
939 }
940
941 {
942 UV uv;
943 int numtype = grok_number (start, dec->cur - start, &uv);
944 if (numtype & IS_NUMBER_IN_UV)
945 if (numtype & IS_NUMBER_NEG)
946 {
947 if (uv < (UV)IV_MIN)
948 return newSViv (-(IV)uv);
949 }
598 else 950 else
599 return newSVuv (uv); 951 return newSVuv (uv);
952
953 // here would likely be the place for bigint support
600 } 954 }
955 }
601 956
957 // if we ever support bigint or bigfloat, this is the place for bigfloat
602 return newSVnv (Atof (start)); 958 return newSVnv (Atof (start));
603 959
604fail: 960fail:
605 return 0; 961 return 0;
606} 962}
… …
608static SV * 964static SV *
609decode_av (dec_t *dec) 965decode_av (dec_t *dec)
610{ 966{
611 AV *av = newAV (); 967 AV *av = newAV ();
612 968
969 DEC_INC_DEPTH;
970 decode_ws (dec);
971
972 if (*dec->cur == ']')
973 ++dec->cur;
974 else
613 for (;;) 975 for (;;)
614 { 976 {
615 SV *value; 977 SV *value;
616 978
617 value = decode_sv (dec); 979 value = decode_sv (dec);
618 if (!value) 980 if (!value)
619 goto fail; 981 goto fail;
620 982
621 av_push (av, value); 983 av_push (av, value);
622 984
623 WS; 985 decode_ws (dec);
624 986
625 if (*dec->cur == ']') 987 if (*dec->cur == ']')
626 { 988 {
627 ++dec->cur; 989 ++dec->cur;
628 break; 990 break;
991 }
629 } 992
630
631 if (*dec->cur != ',') 993 if (*dec->cur != ',')
632 ERR (", or ] expected while parsing array"); 994 ERR (", or ] expected while parsing array");
633 995
634 ++dec->cur; 996 ++dec->cur;
635 } 997 }
636 998
999 DEC_DEC_DEPTH;
637 return newRV_noinc ((SV *)av); 1000 return newRV_noinc ((SV *)av);
638 1001
639fail: 1002fail:
640 SvREFCNT_dec (av); 1003 SvREFCNT_dec (av);
1004 DEC_DEC_DEPTH;
641 return 0; 1005 return 0;
642} 1006}
643 1007
644static SV * 1008static SV *
645decode_hv (dec_t *dec) 1009decode_hv (dec_t *dec)
646{ 1010{
1011 SV *sv;
647 HV *hv = newHV (); 1012 HV *hv = newHV ();
648 1013
1014 DEC_INC_DEPTH;
1015 decode_ws (dec);
1016
1017 if (*dec->cur == '}')
1018 ++dec->cur;
1019 else
649 for (;;) 1020 for (;;)
650 { 1021 {
651 SV *key, *value; 1022 decode_ws (dec); EXPECT_CH ('"');
652 1023
653 WS; EXPECT_CH ('"'); 1024 // heuristic: assume that
654 1025 // a) decode_str + hv_store_ent are abysmally slow.
655 key = decode_str (dec); 1026 // b) most hash keys are short, simple ascii text.
656 if (!key) 1027 // => try to "fast-match" such strings to avoid
657 goto fail; 1028 // the overhead of decode_str + hv_store_ent.
658
659 WS; EXPECT_CH (':');
660
661 value = decode_sv (dec);
662 if (!value)
663 { 1029 {
1030 SV *value;
1031 char *p = dec->cur;
1032 char *e = p + 24; // only try up to 24 bytes
1033
1034 for (;;)
1035 {
1036 // the >= 0x80 is true on most architectures
1037 if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
1038 {
1039 // slow path, back up and use decode_str
1040 SV *key = decode_str (dec);
1041 if (!key)
1042 goto fail;
1043
1044 decode_ws (dec); EXPECT_CH (':');
1045
1046 value = decode_sv (dec);
1047 if (!value)
1048 {
1049 SvREFCNT_dec (key);
1050 goto fail;
1051 }
1052
1053 hv_store_ent (hv, key, value, 0);
664 SvREFCNT_dec (key); 1054 SvREFCNT_dec (key);
1055
1056 break;
1057 }
1058 else if (*p == '"')
1059 {
1060 // fast path, got a simple key
1061 char *key = dec->cur;
1062 int len = p - key;
1063 dec->cur = p + 1;
1064
1065 decode_ws (dec); EXPECT_CH (':');
1066
1067 value = decode_sv (dec);
1068 if (!value)
665 goto fail; 1069 goto fail;
1070
1071 hv_store (hv, key, len, value, 0);
1072
1073 break;
1074 }
1075
1076 ++p;
1077 }
666 } 1078 }
667 1079
668 //TODO: optimise 1080 decode_ws (dec);
669 hv_store_ent (hv, key, value, 0);
670 1081
671 WS;
672
673 if (*dec->cur == '}') 1082 if (*dec->cur == '}')
1083 {
1084 ++dec->cur;
1085 break;
1086 }
1087
1088 if (*dec->cur != ',')
1089 ERR (", or } expected while parsing object/hash");
1090
1091 ++dec->cur;
1092 }
1093
1094 DEC_DEC_DEPTH;
1095 sv = newRV_noinc ((SV *)hv);
1096
1097 // check filter callbacks
1098 if (dec->json.flags & F_HOOK)
1099 {
1100 ENTER; SAVETMPS;
1101
1102 if (HvKEYS (hv) == 1 && dec->json.cb_sk_object)
674 { 1103 {
675 ++dec->cur; 1104 int count;
676 break; 1105
1106 dSP; PUSHMARK (SP);
1107 XPUSHs (sv_2mortal (sv));
1108
1109 PUTBACK; count = call_sv (dec->json.cb_sk_object, G_ARRAY); SPAGAIN;
1110
1111 if (count == 1)
1112 sv = newSVsv (POPs);
1113 else
1114 SvREFCNT_inc (sv);
677 } 1115 }
678 1116
679 if (*dec->cur != ',') 1117 if (dec->json.cb_object)
680 ERR (", or } expected while parsing object/hash"); 1118 {
1119 int count;
681 1120
682 ++dec->cur; 1121 dSP; ENTER; SAVETMPS; PUSHMARK (SP);
1122 XPUSHs (sv_2mortal (sv));
1123
1124 PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
1125
1126 if (count == 1)
1127 sv = newSVsv (POPs);
1128 else
1129 SvREFCNT_inc (sv);
1130 }
1131
1132 FREETMPS; LEAVE;
683 } 1133 }
684 1134
685 return newRV_noinc ((SV *)hv); 1135 return newRV_noinc ((SV *)hv);
686 1136
687fail: 1137fail:
688 SvREFCNT_dec (hv); 1138 SvREFCNT_dec (hv);
1139 DEC_DEC_DEPTH;
689 return 0; 1140 return 0;
690} 1141}
691 1142
692static SV * 1143static SV *
693decode_sv (dec_t *dec) 1144decode_sv (dec_t *dec)
694{ 1145{
695 WS; 1146 decode_ws (dec);
1147
1148 // the beauty of JSON: you need exactly one character lookahead
1149 // to parse anything.
696 switch (*dec->cur) 1150 switch (*dec->cur)
697 { 1151 {
698 case '"': ++dec->cur; return decode_str (dec); 1152 case '"': ++dec->cur; return decode_str (dec);
699 case '[': ++dec->cur; return decode_av (dec); 1153 case '[': ++dec->cur; return decode_av (dec);
700 case '{': ++dec->cur; return decode_hv (dec); 1154 case '{': ++dec->cur; return decode_hv (dec);
… …
706 1160
707 case 't': 1161 case 't':
708 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4)) 1162 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
709 { 1163 {
710 dec->cur += 4; 1164 dec->cur += 4;
711 return newSViv (1); 1165 return SvREFCNT_inc (json_true);
712 } 1166 }
713 else 1167 else
714 ERR ("'true' expected"); 1168 ERR ("'true' expected");
715 1169
716 break; 1170 break;
717 1171
718 case 'f': 1172 case 'f':
719 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5)) 1173 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
720 { 1174 {
721 dec->cur += 5; 1175 dec->cur += 5;
722 return newSViv (0); 1176 return SvREFCNT_inc (json_false);
723 } 1177 }
724 else 1178 else
725 ERR ("'false' expected"); 1179 ERR ("'false' expected");
726 1180
727 break; 1181 break;
728 1182
729 case 'n': 1183 case 'n':
730 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4)) 1184 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))
731 { 1185 {
732 dec->cur += 4; 1186 dec->cur += 4;
733 return newSViv (1); 1187 return newSVsv (&PL_sv_undef);
734 } 1188 }
735 else 1189 else
736 ERR ("'null' expected"); 1190 ERR ("'null' expected");
737 1191
738 break; 1192 break;
739 1193
740 default: 1194 default:
741 ERR ("malformed json string"); 1195 ERR ("malformed JSON string, neither array, object, number, string or atom");
742 break; 1196 break;
743 } 1197 }
744 1198
745fail: 1199fail:
746 return 0; 1200 return 0;
747} 1201}
748 1202
749static SV * 1203static SV *
750decode_json (SV *string, UV flags) 1204decode_json (SV *string, JSON *json, UV *offset_return)
751{ 1205{
1206 dec_t dec;
1207 UV offset;
752 SV *sv; 1208 SV *sv;
753 1209
1210 SvGETMAGIC (string);
1211 SvUPGRADE (string, SVt_PV);
1212
1213 if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
1214 croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
1215 (unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
1216
754 if (!(flags & F_UTF8)) 1217 if (json->flags & F_UTF8)
1218 sv_utf8_downgrade (string, 0);
1219 else
755 sv_utf8_upgrade (string); 1220 sv_utf8_upgrade (string);
756 1221
757 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP 1222 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
758 1223
759 dec_t dec; 1224 dec.json = *json;
760 dec.flags = flags;
761 dec.cur = SvPVX (string); 1225 dec.cur = SvPVX (string);
762 dec.end = SvEND (string); 1226 dec.end = SvEND (string);
763 dec.err = 0; 1227 dec.err = 0;
1228 dec.depth = 0;
1229 dec.maxdepth = DEC_DEPTH (dec.json.flags);
764 1230
765 *dec.end = 1; // invalid anywhere 1231 if (dec.json.cb_object || dec.json.cb_sk_object)
1232 dec.json.flags |= F_HOOK;
1233
1234 *dec.end = 0; // this should basically be a nop, too, but make sure it's there
766 sv = decode_sv (&dec); 1235 sv = decode_sv (&dec);
767 *dec.end = 0; 1236
1237 if (!(offset_return || !sv))
1238 {
1239 // check for trailing garbage
1240 decode_ws (&dec);
1241
1242 if (*dec.cur)
1243 {
1244 dec.err = "garbage after JSON object";
1245 SvREFCNT_dec (sv);
1246 sv = 0;
1247 }
1248 }
1249
1250 if (offset_return || !sv)
1251 {
1252 offset = dec.json.flags & F_UTF8
1253 ? dec.cur - SvPVX (string)
1254 : utf8_distance (dec.cur, SvPVX (string));
1255
1256 if (offset_return)
1257 *offset_return = offset;
1258 }
768 1259
769 if (!sv) 1260 if (!sv)
770 { 1261 {
771 IV offset = utf8_distance (dec.cur, SvPVX (string));
772 SV *uni = sv_newmortal (); 1262 SV *uni = sv_newmortal ();
773 1263
1264 // horrible hack to silence warning inside pv_uni_display
1265 COP cop = *PL_curcop;
1266 cop.cop_warnings = pWARN_NONE;
1267 ENTER;
1268 SAVEVPTR (PL_curcop);
1269 PL_curcop = &cop;
774 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ); 1270 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
1271 LEAVE;
1272
775 croak ("%s, at character %d (%s)", 1273 croak ("%s, at character offset %d [\"%s\"]",
776 dec.err, 1274 dec.err,
777 (int)offset, 1275 (int)offset,
778 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)"); 1276 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
779 } 1277 }
780 1278
781 sv = sv_2mortal (sv); 1279 sv = sv_2mortal (sv);
782 1280
783 if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv)) 1281 if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
784 croak ("JSON object or array expected (but number, string, true, false or null found, use allow_nonref to allow this)"); 1282 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
785 1283
786 return sv; 1284 return sv;
787} 1285}
788 1286
1287/////////////////////////////////////////////////////////////////////////////
1288// XS interface functions
1289
789MODULE = JSON::XS PACKAGE = JSON::XS 1290MODULE = JSON::XS PACKAGE = JSON::XS
790 1291
791BOOT: 1292BOOT:
792{ 1293{
793 int i; 1294 int i;
794 1295
795 memset (decode_hexdigit, 0xff, 256);
796 for (i = 10; i--; ) 1296 for (i = 0; i < 256; ++i)
797 decode_hexdigit ['0' + i] = i; 1297 decode_hexdigit [i] =
1298 i >= '0' && i <= '9' ? i - '0'
1299 : i >= 'a' && i <= 'f' ? i - 'a' + 10
1300 : i >= 'A' && i <= 'F' ? i - 'A' + 10
1301 : -1;
798 1302
799 for (i = 6; --i; ) 1303 json_stash = gv_stashpv ("JSON::XS" , 1);
1304 json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
1305
1306 json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
1307 json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
1308}
1309
1310PROTOTYPES: DISABLE
1311
1312void new (char *klass)
1313 PPCODE:
1314{
1315 SV *pv = NEWSV (0, sizeof (JSON));
1316 SvPOK_only (pv);
1317 Zero (SvPVX (pv), 1, JSON);
1318 ((JSON *)SvPVX (pv))->flags = F_DEFAULT;
1319 XPUSHs (sv_2mortal (sv_bless (newRV_noinc (pv), json_stash)));
1320}
1321
1322void ascii (JSON *self, int enable = 1)
1323 ALIAS:
1324 ascii = F_ASCII
1325 latin1 = F_LATIN1
1326 utf8 = F_UTF8
1327 indent = F_INDENT
1328 canonical = F_CANONICAL
1329 space_before = F_SPACE_BEFORE
1330 space_after = F_SPACE_AFTER
1331 pretty = F_PRETTY
1332 allow_nonref = F_ALLOW_NONREF
1333 shrink = F_SHRINK
1334 allow_blessed = F_ALLOW_BLESSED
1335 convert_blessed = F_CONV_BLESSED
1336 PPCODE:
1337{
1338 if (enable)
1339 self->flags |= ix;
1340 else
1341 self->flags &= ~ix;
1342
1343 XPUSHs (ST (0));
1344}
1345
1346void max_depth (JSON *self, UV max_depth = 0x80000000UL)
1347 PPCODE:
1348{
1349 UV log2 = 0;
1350
1351 if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
1352
1353 while ((1UL << log2) < max_depth)
1354 ++log2;
1355
1356 self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
1357
1358 XPUSHs (ST (0));
1359}
1360
1361void max_size (JSON *self, UV max_size = 0)
1362 PPCODE:
1363{
1364 UV log2 = 0;
1365
1366 if (max_size > 0x80000000UL) max_size = 0x80000000UL;
1367 if (max_size == 1) max_size = 2;
1368
1369 while ((1UL << log2) < max_size)
1370 ++log2;
1371
1372 self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
1373
1374 XPUSHs (ST (0));
1375}
1376
1377void filter_json_objects (JSON *self, SV *cb = &PL_sv_undef)
1378 ALIAS:
1379 filter_sk_json_objects = 1
1380 PPCODE:
1381{
1382 if (!SvOK (cb))
1383 cb = 0;
1384
1385 switch (ix)
800 { 1386 {
801 decode_hexdigit ['a' + i] = 10 + i; 1387 case 0: self->cb_object = cb; break;
802 decode_hexdigit ['A' + i] = 10 + i; 1388 case 1: self->cb_sk_object = cb; break;
803 } 1389 }
804 1390
805 json_stash = gv_stashpv ("JSON::XS", 1); 1391 XPUSHs (ST (0));
806} 1392}
807 1393
808SV *new (char *dummy)
809 CODE:
810 RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);
811 OUTPUT:
812 RETVAL
813
814SV *ascii (SV *self, int enable)
815 ALIAS:
816 ascii = F_ASCII
817 utf8 = F_UTF8
818 indent = F_INDENT
819 canonical = F_CANONICAL
820 space_before = F_SPACE_BEFORE
821 space_after = F_SPACE_AFTER
822 json_rpc = F_JSON_RPC
823 pretty = F_PRETTY
824 allow_nonref = F_ALLOW_NONREF
825 CODE:
826{
827 UV *uv = SvJSON (self);
828 if (enable)
829 *uv |= ix;
830 else
831 *uv &= ~ix;
832
833 RETVAL = newSVsv (self);
834}
835 OUTPUT:
836 RETVAL
837
838void encode (SV *self, SV *scalar) 1394void encode (JSON *self, SV *scalar)
839 PPCODE: 1395 PPCODE:
840 XPUSHs (encode_json (scalar, *SvJSON (self))); 1396 XPUSHs (encode_json (scalar, self));
841 1397
842void decode (SV *self, SV *jsonstr) 1398void decode (JSON *self, SV *jsonstr)
843 PPCODE: 1399 PPCODE:
844 XPUSHs (decode_json (jsonstr, *SvJSON (self))); 1400 XPUSHs (decode_json (jsonstr, self, 0));
1401
1402void decode_prefix (JSON *self, SV *jsonstr)
1403 PPCODE:
1404{
1405 UV offset;
1406 EXTEND (SP, 2);
1407 PUSHs (decode_json (jsonstr, self, &offset));
1408 PUSHs (sv_2mortal (newSVuv (offset)));
1409}
1410
1411PROTOTYPES: ENABLE
845 1412
846void to_json (SV *scalar) 1413void to_json (SV *scalar)
847 PPCODE: 1414 PPCODE:
1415{
1416 JSON json = { F_DEFAULT | F_UTF8 };
848 XPUSHs (encode_json (scalar, F_UTF8)); 1417 XPUSHs (encode_json (scalar, &json));
1418}
849 1419
850void from_json (SV *jsonstr) 1420void from_json (SV *jsonstr)
851 PPCODE: 1421 PPCODE:
1422{
1423 JSON json = { F_DEFAULT | F_UTF8 };
852 XPUSHs (decode_json (jsonstr, F_UTF8)); 1424 XPUSHs (decode_json (jsonstr, &json, 0));
1425}
853 1426

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