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Comparing JSON-XS/XS.xs (file contents):
Revision 1.1 by root, Thu Mar 22 16:40:16 2007 UTC vs.
Revision 1.52 by root, Mon Jul 2 02:57:11 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 encode_indent (enc);
174 encode_sv (enc, *av_fetch (av, i, 0)); 312 encode_sv (enc, *av_fetch (av, i, 0));
175 313
176 if (i < len) 314 if (i < len)
177 COMMA; 315 encode_comma (enc);
178 } 316 }
179 317
180 NL; 318 encode_nl (enc);
181 319
182 --enc->indent; 320 --enc->indent;
183 INDENT; encode_ch (enc, ']'); 321 encode_indent (enc); encode_ch (enc, ']');
184} 322}
185 323
186static void 324static void
187encode_he (enc_t *enc, HE *he) 325encode_he (enc_t *enc, HE *he)
188{ 326{
… …
190 328
191 if (HeKLEN (he) == HEf_SVKEY) 329 if (HeKLEN (he) == HEf_SVKEY)
192 { 330 {
193 SV *sv = HeSVKEY (he); 331 SV *sv = HeSVKEY (he);
194 STRLEN len; 332 STRLEN len;
333 char *str;
334
335 SvGETMAGIC (sv);
195 char *str = SvPV (sv, len); 336 str = SvPV (sv, len);
196 337
197 encode_str (enc, str, len, SvUTF8 (sv)); 338 encode_str (enc, str, len, SvUTF8 (sv));
198 } 339 }
199 else 340 else
200 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he)); 341 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
201 342
202 encode_ch (enc, '"'); 343 encode_ch (enc, '"');
203 344
204 if (enc->flags & F_SPACE_BEFORE) SPACE; 345 if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
205 encode_ch (enc, ':'); 346 encode_ch (enc, ':');
206 if (enc->flags & F_SPACE_AFTER ) SPACE; 347 if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
207 encode_sv (enc, HeVAL (he)); 348 encode_sv (enc, HeVAL (he));
208} 349}
209 350
210// compare hash entries, used when all keys are bytestrings 351// compare hash entries, used when all keys are bytestrings
211static int 352static int
… …
217 HE *b = *(HE **)b_; 358 HE *b = *(HE **)b_;
218 359
219 STRLEN la = HeKLEN (a); 360 STRLEN la = HeKLEN (a);
220 STRLEN lb = HeKLEN (b); 361 STRLEN lb = HeKLEN (b);
221 362
222 if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb))) 363 if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))
223 cmp = la < lb ? -1 : la == lb ? 0 : 1; 364 cmp = la - lb;
224 365
225 return cmp; 366 return cmp;
226} 367}
227 368
228// compare hash entries, used when some keys are sv's or utf-x 369// compare hash entries, used when some keys are sv's or utf-x
… …
235static void 376static void
236encode_hv (enc_t *enc, HV *hv) 377encode_hv (enc_t *enc, HV *hv)
237{ 378{
238 int count, i; 379 int count, i;
239 380
381 if (enc->indent >= enc->maxdepth)
382 croak ("data structure too deep (hit recursion limit)");
383
240 encode_ch (enc, '{'); NL; ++enc->indent; 384 encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
241 385
242 if ((count = hv_iterinit (hv))) 386 if ((count = hv_iterinit (hv)))
243 { 387 {
244 // for canonical output we have to sort by keys first 388 // for canonical output we have to sort by keys first
245 // actually, this is mostly due to the stupid so-called 389 // actually, this is mostly due to the stupid so-called
246 // security workaround added somewhere in 5.8.x. 390 // security workaround added somewhere in 5.8.x.
247 // that randomises hash orderings 391 // that randomises hash orderings
248 if (enc->flags & F_CANONICAL) 392 if (enc->json.flags & F_CANONICAL)
249 { 393 {
250 HE *he, *hes [count];
251 int fast = 1; 394 int fast = 1;
395 HE *he;
396#if defined(__BORLANDC__) || defined(_MSC_VER)
397 HE **hes = _alloca (count * sizeof (HE));
398#else
399 HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
400#endif
252 401
253 i = 0; 402 i = 0;
254 while ((he = hv_iternext (hv))) 403 while ((he = hv_iternext (hv)))
255 { 404 {
256 hes [i++] = he; 405 hes [i++] = he;
… …
262 411
263 if (fast) 412 if (fast)
264 qsort (hes, count, sizeof (HE *), he_cmp_fast); 413 qsort (hes, count, sizeof (HE *), he_cmp_fast);
265 else 414 else
266 { 415 {
267 // hack to disable "use bytes" 416 // hack to forcefully disable "use bytes"
268 COP *oldcop = PL_curcop, cop; 417 COP cop = *PL_curcop;
269 cop.op_private = 0; 418 cop.op_private = 0;
419
420 ENTER;
421 SAVETMPS;
422
423 SAVEVPTR (PL_curcop);
270 PL_curcop = &cop; 424 PL_curcop = &cop;
271 425
272 SAVETMPS;
273 qsort (hes, count, sizeof (HE *), he_cmp_slow); 426 qsort (hes, count, sizeof (HE *), he_cmp_slow);
427
274 FREETMPS; 428 FREETMPS;
275 429 LEAVE;
276 PL_curcop = oldcop;
277 } 430 }
278 431
279 for (i = 0; i < count; ++i) 432 for (i = 0; i < count; ++i)
280 { 433 {
281 INDENT; 434 encode_indent (enc);
282 encode_he (enc, hes [i]); 435 encode_he (enc, hes [i]);
283 436
284 if (i < count - 1) 437 if (i < count - 1)
285 COMMA; 438 encode_comma (enc);
286 }
287
288 NL; 439 }
440
441 encode_nl (enc);
289 } 442 }
290 else 443 else
291 { 444 {
292 SV *sv;
293 HE *he = hv_iternext (hv); 445 HE *he = hv_iternext (hv);
294 446
295 for (;;) 447 for (;;)
296 { 448 {
297 INDENT; 449 encode_indent (enc);
298 encode_he (enc, he); 450 encode_he (enc, he);
299 451
300 if (!(he = hv_iternext (hv))) 452 if (!(he = hv_iternext (hv)))
301 break; 453 break;
302 454
303 COMMA; 455 encode_comma (enc);
304 }
305
306 NL; 456 }
457
458 encode_nl (enc);
307 } 459 }
308 } 460 }
309 461
310 --enc->indent; INDENT; encode_ch (enc, '}'); 462 --enc->indent; encode_indent (enc); encode_ch (enc, '}');
463}
464
465// encode objects, arrays and special \0=false and \1=true values.
466static void
467encode_rv (enc_t *enc, SV *sv)
468{
469 svtype svt;
470
471 SvGETMAGIC (sv);
472 svt = SvTYPE (sv);
473
474 if (expect_false (SvOBJECT (sv)))
475 {
476 if (SvSTASH (sv) == json_boolean_stash)
477 {
478 if (SvIV (sv))
479 encode_str (enc, "true", 4, 0);
480 else
481 encode_str (enc, "false", 5, 0);
482 }
483 else
484 {
485#if 0
486 if (0 && sv_derived_from (rv, "JSON::Literal"))
487 {
488 // not yet
489 }
490#endif
491 if (enc->json.flags & F_CONV_BLESSED)
492 {
493 // we re-bless the reference to get overload and other niceties right
494 GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 1);
495
496 if (to_json)
497 {
498 dSP; ENTER; SAVETMPS; PUSHMARK (SP);
499 XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
500
501 // calling with G_SCALAR ensures that we always get a 1 reutrn value
502 // check anyways.
503 PUTBACK;
504 assert (1 == call_sv ((SV *)GvCV (to_json), G_SCALAR));
505 SPAGAIN;
506
507 encode_sv (enc, POPs);
508
509 FREETMPS; LEAVE;
510 }
511 else if (enc->json.flags & F_ALLOW_BLESSED)
512 encode_str (enc, "null", 4, 0);
513 else
514 croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
515 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
516 }
517 else if (enc->json.flags & F_ALLOW_BLESSED)
518 encode_str (enc, "null", 4, 0);
519 else
520 croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
521 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
522 }
523 }
524 else if (svt == SVt_PVHV)
525 encode_hv (enc, (HV *)sv);
526 else if (svt == SVt_PVAV)
527 encode_av (enc, (AV *)sv);
528 else if (svt < SVt_PVAV)
529 {
530 STRLEN len = 0;
531 char *pv = svt ? SvPV (sv, len) : 0;
532
533 if (len == 1 && *pv == '1')
534 encode_str (enc, "true", 4, 0);
535 else if (len == 1 && *pv == '0')
536 encode_str (enc, "false", 5, 0);
537 else
538 croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
539 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
540 }
541 else
542 croak ("encountered %s, but JSON can only represent references to arrays or hashes",
543 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
311} 544}
312 545
313static void 546static void
314encode_sv (enc_t *enc, SV *sv) 547encode_sv (enc_t *enc, SV *sv)
315{ 548{
549 SvGETMAGIC (sv);
550
316 if (SvPOKp (sv)) 551 if (SvPOKp (sv))
317 { 552 {
318 STRLEN len; 553 STRLEN len;
319 char *str = SvPV (sv, len); 554 char *str = SvPV (sv, len);
320 encode_ch (enc, '"'); 555 encode_ch (enc, '"');
321 encode_str (enc, str, len, SvUTF8 (sv)); 556 encode_str (enc, str, len, SvUTF8 (sv));
322 encode_ch (enc, '"'); 557 encode_ch (enc, '"');
323 } 558 }
324 else if (SvNOKp (sv)) 559 else if (SvNOKp (sv))
325 { 560 {
561 // trust that perl will do the right thing w.r.t. JSON syntax.
326 need (enc, NV_DIG + 32); 562 need (enc, NV_DIG + 32);
327 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 563 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
328 enc->cur += strlen (enc->cur); 564 enc->cur += strlen (enc->cur);
329 } 565 }
330 else if (SvIOKp (sv)) 566 else if (SvIOKp (sv))
331 { 567 {
332 need (enc, 64); 568 // we assume we can always read an IV as a UV
569 if (SvUV (sv) & ~(UV)0x7fff)
570 {
571 // large integer, use the (rather slow) snprintf way.
572 need (enc, sizeof (UV) * 3);
333 enc->cur += 573 enc->cur +=
334 SvIsUV(sv) 574 SvIsUV(sv)
335 ? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv)) 575 ? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
336 : snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv)); 576 : snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
577 }
578 else
579 {
580 // optimise the "small number case"
581 // code will likely be branchless and use only a single multiplication
582 I32 i = SvIV (sv);
583 U32 u;
584 char digit, nz = 0;
585
586 need (enc, 6);
587
588 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
589 u = i < 0 ? -i : i;
590
591 // convert to 4.28 fixed-point representation
592 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
593
594 // now output digit by digit, each time masking out the integer part
595 // and multiplying by 5 while moving the decimal point one to the right,
596 // resulting in a net multiplication by 10.
597 // we always write the digit to memory but conditionally increment
598 // the pointer, to ease the usage of conditional move instructions.
599 digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
600 digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
601 digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
602 digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
603 digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
604 }
337 } 605 }
338 else if (SvROK (sv)) 606 else if (SvROK (sv))
339 { 607 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)) 608 else if (!SvOK (sv))
355 encode_str (enc, "null", 4, 0); 609 encode_str (enc, "null", 4, 0);
356 else 610 else
357 croak ("encountered perl type that JSON cannot handle"); 611 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
612 SvPV_nolen (sv), SvFLAGS (sv));
358} 613}
359 614
360static SV * 615static SV *
361encode_json (SV *scalar, UV flags) 616encode_json (SV *scalar, JSON *json)
362{ 617{
363 enc_t enc; 618 enc_t enc;
364 enc.flags = flags; 619
620 if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
621 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
622
623 enc.json = *json;
365 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE)); 624 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
366 enc.cur = SvPVX (enc.sv); 625 enc.cur = SvPVX (enc.sv);
367 enc.end = SvEND (enc.sv); 626 enc.end = SvEND (enc.sv);
368 enc.max_recurse = 0;
369 enc.indent = 0; 627 enc.indent = 0;
628 enc.maxdepth = DEC_DEPTH (enc.json.flags);
370 629
371 SvPOK_only (enc.sv); 630 SvPOK_only (enc.sv);
372 encode_sv (&enc, scalar); 631 encode_sv (&enc, scalar);
373 632
633 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
634 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
635
374 if (!(flags & (F_ASCII | F_UTF8))) 636 if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
375 SvUTF8_on (enc.sv); 637 SvUTF8_on (enc.sv);
376 638
377 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv)); 639 if (enc.json.flags & F_SHRINK)
640 shrink (enc.sv);
641
378 return enc.sv; 642 return enc.sv;
379} 643}
380 644
381///////////////////////////////////////////////////////////////////////////// 645/////////////////////////////////////////////////////////////////////////////
646// decoder
382 647
383#define WS \ 648// structure used for decoding JSON
649typedef struct
650{
651 char *cur; // current parser pointer
652 char *end; // end of input string
653 const char *err; // parse error, if != 0
654 JSON json;
655 U32 depth; // recursion depth
656 U32 maxdepth; // recursion depth limit
657} dec_t;
658
659inline void
660decode_ws (dec_t *dec)
661{
384 for (;;) \ 662 for (;;)
385 { \ 663 {
386 char ch = *dec->cur; \ 664 char ch = *dec->cur;
665
387 if (ch > 0x20 \ 666 if (ch > 0x20
388 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \ 667 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
389 break; \ 668 break;
669
390 ++dec->cur; \ 670 ++dec->cur;
391 } 671 }
672}
392 673
393#define ERR(reason) SB dec->err = reason; goto fail; SE 674#define ERR(reason) SB dec->err = reason; goto fail; SE
675
394#define EXPECT_CH(ch) SB \ 676#define EXPECT_CH(ch) SB \
395 if (*dec->cur != ch) \ 677 if (*dec->cur != ch) \
396 ERR (# ch " expected"); \ 678 ERR (# ch " expected"); \
397 ++dec->cur; \ 679 ++dec->cur; \
398 SE 680 SE
399 681
682#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
683#define DEC_DEC_DEPTH --dec->depth
684
400static SV *decode_sv (dec_t *dec); 685static 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
406 686
407static signed char decode_hexdigit[256]; 687static signed char decode_hexdigit[256];
408 688
409static UV 689static UV
410decode_4hex (dec_t *dec) 690decode_4hex (dec_t *dec)
411{ 691{
412 signed char d1, d2, d3, d4; 692 signed char d1, d2, d3, d4;
693 unsigned char *cur = (unsigned char *)dec->cur;
413 694
414 d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]]; 695 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"); 696 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]]; 697 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"); 698 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");
422 699
423 dec->cur += 4; 700 dec->cur += 4;
424 701
425 return ((UV)d1) << 12 702 return ((UV)d1) << 12
426 | ((UV)d2) << 8 703 | ((UV)d2) << 8
… …
432} 709}
433 710
434static SV * 711static SV *
435decode_str (dec_t *dec) 712decode_str (dec_t *dec)
436{ 713{
437 SV *sv = NEWSV (0,2); 714 SV *sv = 0;
438 STRLEN cur = 0;
439 int utf8 = 0; 715 int utf8 = 0;
716 char *dec_cur = dec->cur;
440 717
441 for (;;) 718 do
442 { 719 {
443 unsigned char ch = *(unsigned char *)dec->cur; 720 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
721 char *cur = buf;
444 722
445 if (ch == '"') 723 do
446 break;
447 else if (ch == '\\')
448 { 724 {
449 switch (*++dec->cur) 725 unsigned char ch = *(unsigned char *)dec_cur++;
726
727 if (expect_false (ch == '"'))
728 {
729 --dec_cur;
730 break;
450 { 731 }
451 case '\\': 732 else if (expect_false (ch == '\\'))
452 case '/': 733 {
453 case '"': APPEND_CH (*dec->cur++); break; 734 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 { 735 {
463 UV lo, hi; 736 case '\\':
464 ++dec->cur; 737 case '/':
738 case '"': *cur++ = *dec_cur++; break;
465 739
466 hi = decode_4hex (dec); 740 case 'b': ++dec_cur; *cur++ = '\010'; break;
467 if (hi == (UV)-1) 741 case 't': ++dec_cur; *cur++ = '\011'; break;
468 goto fail; 742 case 'n': ++dec_cur; *cur++ = '\012'; break;
743 case 'f': ++dec_cur; *cur++ = '\014'; break;
744 case 'r': ++dec_cur; *cur++ = '\015'; break;
469 745
470 // possibly a surrogate pair 746 case 'u':
471 if (hi >= 0xd800 && hi < 0xdc00)
472 { 747 {
473 if (dec->cur [0] != '\\' || dec->cur [1] != 'u') 748 UV lo, hi;
474 ERR ("illegal surrogate character"); 749 ++dec_cur;
475 750
476 dec->cur += 2; 751 dec->cur = dec_cur;
477
478 lo = decode_4hex (dec); 752 hi = decode_4hex (dec);
753 dec_cur = dec->cur;
479 if (lo == (UV)-1) 754 if (hi == (UV)-1)
480 goto fail; 755 goto fail;
481 756
757 // possibly a surrogate pair
758 if (hi >= 0xd800)
759 if (hi < 0xdc00)
760 {
761 if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
762 ERR ("missing low surrogate character in surrogate pair");
763
764 dec_cur += 2;
765
766 dec->cur = dec_cur;
767 lo = decode_4hex (dec);
768 dec_cur = dec->cur;
769 if (lo == (UV)-1)
770 goto fail;
771
482 if (lo < 0xdc00 || lo >= 0xe000) 772 if (lo < 0xdc00 || lo >= 0xe000)
483 ERR ("surrogate pair expected"); 773 ERR ("surrogate pair expected");
484 774
485 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; 775 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
776 }
777 else if (hi < 0xe000)
778 ERR ("missing high surrogate character in surrogate pair");
779
780 if (hi >= 0x80)
781 {
782 utf8 = 1;
783
784 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
785 }
786 else
787 *cur++ = hi;
486 } 788 }
487 else if (lo >= 0xdc00 && lo < 0xe000)
488 ERR ("illegal surrogate character");
489
490 if (hi >= 0x80)
491 { 789 break;
492 utf8 = 1;
493 790
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 791 default:
498 APPEND_CH (hi); 792 --dec_cur;
793 ERR ("illegal backslash escape sequence in string");
499 } 794 }
795 }
796 else if (expect_true (ch >= 0x20 && ch <= 0x7f))
797 *cur++ = ch;
798 else if (ch >= 0x80)
799 {
800 STRLEN clen;
801 UV uch;
802
803 --dec_cur;
804
805 uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
806 if (clen == (STRLEN)-1)
807 ERR ("malformed UTF-8 character in JSON string");
808
809 do
810 *cur++ = *dec_cur++;
811 while (--clen);
812
813 utf8 = 1;
814 }
815 else
816 {
817 --dec_cur;
818
819 if (!ch)
820 ERR ("unexpected end of string while parsing JSON string");
500 break; 821 else
822 ERR ("invalid character encountered while parsing JSON string");
501 } 823 }
502 } 824 }
503 else if (ch >= 0x20 && ch <= 0x7f) 825 while (cur < buf + SHORT_STRING_LEN);
504 APPEND_CH (*dec->cur++); 826
505 else if (ch >= 0x80) 827 {
828 STRLEN len = cur - buf;
829
830 if (sv)
506 { 831 {
507 STRLEN clen; 832 SvGROW (sv, SvCUR (sv) + len + 1);
508 UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY); 833 memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
509 if (clen < 0) 834 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 } 835 }
516 else 836 else
517 ERR ("invalid character encountered"); 837 sv = newSVpvn (buf, len);
518 } 838 }
839 }
840 while (*dec_cur != '"');
519 841
520 ++dec->cur; 842 ++dec_cur;
521 843
844 if (sv)
845 {
522 SvPOK_only (sv); 846 SvPOK_only (sv);
523
524 SvCUR_set (sv, cur);
525 *SvEND (sv) = 0; 847 *SvEND (sv) = 0;
526 848
527 if (utf8) 849 if (utf8)
528 SvUTF8_on (sv); 850 SvUTF8_on (sv);
851 }
852 else
853 sv = newSVpvn ("", 0);
529 854
855 dec->cur = dec_cur;
530 return sv; 856 return sv;
531 857
532fail: 858fail:
533 SvREFCNT_dec (sv); 859 dec->cur = dec_cur;
534 return 0; 860 return 0;
535} 861}
536 862
537static SV * 863static SV *
538decode_num (dec_t *dec) 864decode_num (dec_t *dec)
… …
548 { 874 {
549 ++dec->cur; 875 ++dec->cur;
550 if (*dec->cur >= '0' && *dec->cur <= '9') 876 if (*dec->cur >= '0' && *dec->cur <= '9')
551 ERR ("malformed number (leading zero must not be followed by another digit)"); 877 ERR ("malformed number (leading zero must not be followed by another digit)");
552 } 878 }
553 879 else if (*dec->cur < '0' || *dec->cur > '9')
554 // int 880 ERR ("malformed number (no digits after initial minus)");
881 else
882 do
883 {
884 ++dec->cur;
885 }
555 while (*dec->cur >= '0' && *dec->cur <= '9') 886 while (*dec->cur >= '0' && *dec->cur <= '9');
556 ++dec->cur;
557 887
558 // [frac] 888 // [frac]
559 if (*dec->cur == '.') 889 if (*dec->cur == '.')
560 { 890 {
561 is_nv = 1; 891 ++dec->cur;
892
893 if (*dec->cur < '0' || *dec->cur > '9')
894 ERR ("malformed number (no digits after decimal point)");
562 895
563 do 896 do
564 { 897 {
565 ++dec->cur; 898 ++dec->cur;
566 } 899 }
567 while (*dec->cur >= '0' && *dec->cur <= '9'); 900 while (*dec->cur >= '0' && *dec->cur <= '9');
901
902 is_nv = 1;
568 } 903 }
569 904
570 // [exp] 905 // [exp]
571 if (*dec->cur == 'e' || *dec->cur == 'E') 906 if (*dec->cur == 'e' || *dec->cur == 'E')
572 { 907 {
573 is_nv = 1;
574
575 ++dec->cur; 908 ++dec->cur;
909
576 if (*dec->cur == '-' || *dec->cur == '+') 910 if (*dec->cur == '-' || *dec->cur == '+')
577 ++dec->cur; 911 ++dec->cur;
578 912
913 if (*dec->cur < '0' || *dec->cur > '9')
914 ERR ("malformed number (no digits after exp sign)");
915
916 do
917 {
918 ++dec->cur;
919 }
579 while (*dec->cur >= '0' && *dec->cur <= '9') 920 while (*dec->cur >= '0' && *dec->cur <= '9');
580 ++dec->cur; 921
922 is_nv = 1;
581 } 923 }
582 924
583 if (!is_nv) 925 if (!is_nv)
584 { 926 {
585 UV uv; 927 // 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); 928 if (*start == '-')
587 if (numtype & IS_NUMBER_IN_UV) 929 switch (dec->cur - start)
588 if (numtype & IS_NUMBER_NEG)
589 { 930 {
590 if (uv < (UV)IV_MIN) 931 case 2: return newSViv (-( start [1] - '0' * 1));
591 return newSViv (-(IV)uv); 932 case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
933 case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
934 case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
592 } 935 }
936 else
937 switch (dec->cur - start)
938 {
939 case 1: return newSViv ( start [0] - '0' * 1);
940 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
941 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
942 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
943 }
944
945 {
946 UV uv;
947 int numtype = grok_number (start, dec->cur - start, &uv);
948 if (numtype & IS_NUMBER_IN_UV)
949 if (numtype & IS_NUMBER_NEG)
950 {
951 if (uv < (UV)IV_MIN)
952 return newSViv (-(IV)uv);
953 }
593 else 954 else
594 return newSVuv (uv); 955 return newSVuv (uv);
956
957 // here would likely be the place for bigint support
595 } 958 }
959 }
596 960
961 // if we ever support bigint or bigfloat, this is the place for bigfloat
597 return newSVnv (Atof (start)); 962 return newSVnv (Atof (start));
598 963
599fail: 964fail:
600 return 0; 965 return 0;
601} 966}
… …
603static SV * 968static SV *
604decode_av (dec_t *dec) 969decode_av (dec_t *dec)
605{ 970{
606 AV *av = newAV (); 971 AV *av = newAV ();
607 972
973 DEC_INC_DEPTH;
974 decode_ws (dec);
975
976 if (*dec->cur == ']')
977 ++dec->cur;
978 else
608 for (;;) 979 for (;;)
609 { 980 {
610 SV *value; 981 SV *value;
611 982
612 value = decode_sv (dec); 983 value = decode_sv (dec);
613 if (!value) 984 if (!value)
614 goto fail; 985 goto fail;
615 986
616 av_push (av, value); 987 av_push (av, value);
617 988
618 WS; 989 decode_ws (dec);
619 990
620 if (*dec->cur == ']') 991 if (*dec->cur == ']')
621 { 992 {
622 ++dec->cur; 993 ++dec->cur;
623 break; 994 break;
995 }
624 } 996
625
626 if (*dec->cur != ',') 997 if (*dec->cur != ',')
627 ERR (", or ] expected while parsing array"); 998 ERR (", or ] expected while parsing array");
628 999
629 ++dec->cur; 1000 ++dec->cur;
630 } 1001 }
631 1002
1003 DEC_DEC_DEPTH;
632 return newRV_noinc ((SV *)av); 1004 return newRV_noinc ((SV *)av);
633 1005
634fail: 1006fail:
635 SvREFCNT_dec (av); 1007 SvREFCNT_dec (av);
1008 DEC_DEC_DEPTH;
636 return 0; 1009 return 0;
637} 1010}
638 1011
639static SV * 1012static SV *
640decode_hv (dec_t *dec) 1013decode_hv (dec_t *dec)
641{ 1014{
1015 SV *sv;
642 HV *hv = newHV (); 1016 HV *hv = newHV ();
643 1017
1018 DEC_INC_DEPTH;
1019 decode_ws (dec);
1020
1021 if (*dec->cur == '}')
1022 ++dec->cur;
1023 else
644 for (;;) 1024 for (;;)
645 { 1025 {
646 SV *key, *value; 1026 decode_ws (dec); EXPECT_CH ('"');
647 1027
648 WS; EXPECT_CH ('"'); 1028 // heuristic: assume that
649 1029 // a) decode_str + hv_store_ent are abysmally slow.
650 key = decode_str (dec); 1030 // b) most hash keys are short, simple ascii text.
651 if (!key) 1031 // => try to "fast-match" such strings to avoid
652 goto fail; 1032 // the overhead of decode_str + hv_store_ent.
653
654 WS; EXPECT_CH (':');
655
656 value = decode_sv (dec);
657 if (!value)
658 { 1033 {
1034 SV *value;
1035 char *p = dec->cur;
1036 char *e = p + 24; // only try up to 24 bytes
1037
1038 for (;;)
1039 {
1040 // the >= 0x80 is true on most architectures
1041 if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
1042 {
1043 // slow path, back up and use decode_str
1044 SV *key = decode_str (dec);
1045 if (!key)
1046 goto fail;
1047
1048 decode_ws (dec); EXPECT_CH (':');
1049
1050 value = decode_sv (dec);
1051 if (!value)
1052 {
1053 SvREFCNT_dec (key);
1054 goto fail;
1055 }
1056
1057 hv_store_ent (hv, key, value, 0);
659 SvREFCNT_dec (key); 1058 SvREFCNT_dec (key);
1059
1060 break;
1061 }
1062 else if (*p == '"')
1063 {
1064 // fast path, got a simple key
1065 char *key = dec->cur;
1066 int len = p - key;
1067 dec->cur = p + 1;
1068
1069 decode_ws (dec); EXPECT_CH (':');
1070
1071 value = decode_sv (dec);
1072 if (!value)
660 goto fail; 1073 goto fail;
1074
1075 hv_store (hv, key, len, value, 0);
1076
1077 break;
1078 }
1079
1080 ++p;
1081 }
661 } 1082 }
662 1083
663 //TODO: optimise 1084 decode_ws (dec);
664 hv_store_ent (hv, key, value, 0);
665 1085
666 WS;
667
668 if (*dec->cur == '}') 1086 if (*dec->cur == '}')
1087 {
1088 ++dec->cur;
1089 break;
1090 }
1091
1092 if (*dec->cur != ',')
1093 ERR (", or } expected while parsing object/hash");
1094
1095 ++dec->cur;
1096 }
1097
1098 DEC_DEC_DEPTH;
1099 sv = newRV_noinc ((SV *)hv);
1100
1101 // check filter callbacks
1102 if (dec->json.flags & F_HOOK)
1103 {
1104 if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
669 { 1105 {
670 ++dec->cur; 1106 HE *cb, *he;
671 break; 1107
1108 hv_iterinit (hv);
1109 he = hv_iternext (hv);
1110 hv_iterinit (hv);
1111
1112 // the next line creates a mortal sv each time its called.
1113 // might want to optimise this for common cases.
1114 cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
1115
1116 if (cb)
1117 {
1118 int count;
1119 ENTER; SAVETMPS;
1120
1121 dSP; PUSHMARK (SP);
1122 XPUSHs (HeVAL (he));
1123
1124 PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
1125
1126 if (count == 1)
1127 {
1128 sv = newSVsv (POPs);
1129 FREETMPS; LEAVE;
1130 return sv;
1131 }
1132
1133 FREETMPS; LEAVE;
1134 }
672 } 1135 }
673 1136
674 if (*dec->cur != ',') 1137 if (dec->json.cb_object)
675 ERR (", or } expected while parsing object/hash"); 1138 {
1139 int count;
1140 ENTER; SAVETMPS;
676 1141
677 ++dec->cur; 1142 dSP; ENTER; SAVETMPS; PUSHMARK (SP);
678 } 1143 XPUSHs (sv_2mortal (sv));
679 1144
680 return newRV_noinc ((SV *)hv); 1145 PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
1146
1147 if (count == 1)
1148 {
1149 sv = newSVsv (POPs);
1150 FREETMPS; LEAVE;
1151 return sv;
1152 }
1153
1154 SvREFCNT_inc (sv);
1155 FREETMPS; LEAVE;
1156 }
1157 }
1158
1159 return sv;
681 1160
682fail: 1161fail:
683 SvREFCNT_dec (hv); 1162 SvREFCNT_dec (hv);
1163 DEC_DEC_DEPTH;
684 return 0; 1164 return 0;
685} 1165}
686 1166
687static SV * 1167static SV *
688decode_sv (dec_t *dec) 1168decode_sv (dec_t *dec)
689{ 1169{
690 WS; 1170 decode_ws (dec);
1171
1172 // the beauty of JSON: you need exactly one character lookahead
1173 // to parse anything.
691 switch (*dec->cur) 1174 switch (*dec->cur)
692 { 1175 {
693 case '"': ++dec->cur; return decode_str (dec); 1176 case '"': ++dec->cur; return decode_str (dec);
694 case '[': ++dec->cur; return decode_av (dec); 1177 case '[': ++dec->cur; return decode_av (dec);
695 case '{': ++dec->cur; return decode_hv (dec); 1178 case '{': ++dec->cur; return decode_hv (dec);
… …
701 1184
702 case 't': 1185 case 't':
703 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4)) 1186 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
704 { 1187 {
705 dec->cur += 4; 1188 dec->cur += 4;
706 return newSViv (1); 1189 return SvREFCNT_inc (json_true);
707 } 1190 }
708 else 1191 else
709 ERR ("'true' expected"); 1192 ERR ("'true' expected");
710 1193
711 break; 1194 break;
712 1195
713 case 'f': 1196 case 'f':
714 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5)) 1197 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
715 { 1198 {
716 dec->cur += 5; 1199 dec->cur += 5;
717 return newSViv (0); 1200 return SvREFCNT_inc (json_false);
718 } 1201 }
719 else 1202 else
720 ERR ("'false' expected"); 1203 ERR ("'false' expected");
721 1204
722 break; 1205 break;
723 1206
724 case 'n': 1207 case 'n':
725 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4)) 1208 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))
726 { 1209 {
727 dec->cur += 4; 1210 dec->cur += 4;
728 return newSViv (1); 1211 return newSVsv (&PL_sv_undef);
729 } 1212 }
730 else 1213 else
731 ERR ("'null' expected"); 1214 ERR ("'null' expected");
732 1215
733 break; 1216 break;
734 1217
735 default: 1218 default:
736 ERR ("malformed json string"); 1219 ERR ("malformed JSON string, neither array, object, number, string or atom");
737 break; 1220 break;
738 } 1221 }
739 1222
740fail: 1223fail:
741 return 0; 1224 return 0;
742} 1225}
743 1226
744static SV * 1227static SV *
745decode_json (SV *string, UV flags) 1228decode_json (SV *string, JSON *json, UV *offset_return)
746{ 1229{
1230 dec_t dec;
1231 UV offset;
747 SV *sv; 1232 SV *sv;
748 1233
1234 SvGETMAGIC (string);
1235 SvUPGRADE (string, SVt_PV);
1236
1237 if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
1238 croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
1239 (unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
1240
749 if (!(flags & F_UTF8)) 1241 if (json->flags & F_UTF8)
1242 sv_utf8_downgrade (string, 0);
1243 else
750 sv_utf8_upgrade (string); 1244 sv_utf8_upgrade (string);
751 1245
752 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP 1246 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
753 1247
754 dec_t dec; 1248 dec.json = *json;
755 dec.flags = flags;
756 dec.cur = SvPVX (string); 1249 dec.cur = SvPVX (string);
757 dec.end = SvEND (string); 1250 dec.end = SvEND (string);
758 dec.err = 0; 1251 dec.err = 0;
1252 dec.depth = 0;
1253 dec.maxdepth = DEC_DEPTH (dec.json.flags);
759 1254
760 *dec.end = 1; // invalid anywhere 1255 if (dec.json.cb_object || dec.json.cb_sk_object)
1256 dec.json.flags |= F_HOOK;
1257
1258 *dec.end = 0; // this should basically be a nop, too, but make sure it's there
761 sv = decode_sv (&dec); 1259 sv = decode_sv (&dec);
762 *dec.end = 0; 1260
1261 if (!(offset_return || !sv))
1262 {
1263 // check for trailing garbage
1264 decode_ws (&dec);
1265
1266 if (*dec.cur)
1267 {
1268 dec.err = "garbage after JSON object";
1269 SvREFCNT_dec (sv);
1270 sv = 0;
1271 }
1272 }
1273
1274 if (offset_return || !sv)
1275 {
1276 offset = dec.json.flags & F_UTF8
1277 ? dec.cur - SvPVX (string)
1278 : utf8_distance (dec.cur, SvPVX (string));
1279
1280 if (offset_return)
1281 *offset_return = offset;
1282 }
763 1283
764 if (!sv) 1284 if (!sv)
765 { 1285 {
766 IV offset = utf8_distance (dec.cur, SvPVX (string));
767 SV *uni = sv_newmortal (); 1286 SV *uni = sv_newmortal ();
768 1287
1288 // horrible hack to silence warning inside pv_uni_display
1289 COP cop = *PL_curcop;
1290 cop.cop_warnings = pWARN_NONE;
1291 ENTER;
1292 SAVEVPTR (PL_curcop);
1293 PL_curcop = &cop;
769 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ); 1294 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
1295 LEAVE;
1296
770 croak ("%s, at character %d (%s)", 1297 croak ("%s, at character offset %d [\"%s\"]",
771 dec.err, 1298 dec.err,
772 (int)offset, 1299 (int)offset,
773 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)"); 1300 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
774 } 1301 }
775 1302
776 sv_dump (sv);//D
777 return sv_2mortal (sv); 1303 sv = sv_2mortal (sv);
1304
1305 if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
1306 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
1307
1308 return sv;
778} 1309}
1310
1311/////////////////////////////////////////////////////////////////////////////
1312// XS interface functions
779 1313
780MODULE = JSON::XS PACKAGE = JSON::XS 1314MODULE = JSON::XS PACKAGE = JSON::XS
781 1315
782BOOT: 1316BOOT:
783{ 1317{
784 int i; 1318 int i;
785 1319
786 memset (decode_hexdigit, 0xff, 256);
787 for (i = 10; i--; ) 1320 for (i = 0; i < 256; ++i)
788 decode_hexdigit ['0' + i] = i; 1321 decode_hexdigit [i] =
1322 i >= '0' && i <= '9' ? i - '0'
1323 : i >= 'a' && i <= 'f' ? i - 'a' + 10
1324 : i >= 'A' && i <= 'F' ? i - 'A' + 10
1325 : -1;
789 1326
790 for (i = 6; --i; ) 1327 json_stash = gv_stashpv ("JSON::XS" , 1);
1328 json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
1329
1330 json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
1331 json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
1332}
1333
1334PROTOTYPES: DISABLE
1335
1336void new (char *klass)
1337 PPCODE:
1338{
1339 SV *pv = NEWSV (0, sizeof (JSON));
1340 SvPOK_only (pv);
1341 Zero (SvPVX (pv), 1, JSON);
1342 ((JSON *)SvPVX (pv))->flags = F_DEFAULT;
1343 XPUSHs (sv_2mortal (sv_bless (newRV_noinc (pv), json_stash)));
1344}
1345
1346void ascii (JSON *self, int enable = 1)
1347 ALIAS:
1348 ascii = F_ASCII
1349 latin1 = F_LATIN1
1350 utf8 = F_UTF8
1351 indent = F_INDENT
1352 canonical = F_CANONICAL
1353 space_before = F_SPACE_BEFORE
1354 space_after = F_SPACE_AFTER
1355 pretty = F_PRETTY
1356 allow_nonref = F_ALLOW_NONREF
1357 shrink = F_SHRINK
1358 allow_blessed = F_ALLOW_BLESSED
1359 convert_blessed = F_CONV_BLESSED
1360 PPCODE:
1361{
1362 if (enable)
1363 self->flags |= ix;
1364 else
1365 self->flags &= ~ix;
1366
1367 XPUSHs (ST (0));
1368}
1369
1370void max_depth (JSON *self, UV max_depth = 0x80000000UL)
1371 PPCODE:
1372{
1373 UV log2 = 0;
1374
1375 if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
1376
1377 while ((1UL << log2) < max_depth)
1378 ++log2;
1379
1380 self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
1381
1382 XPUSHs (ST (0));
1383}
1384
1385void max_size (JSON *self, UV max_size = 0)
1386 PPCODE:
1387{
1388 UV log2 = 0;
1389
1390 if (max_size > 0x80000000UL) max_size = 0x80000000UL;
1391 if (max_size == 1) max_size = 2;
1392
1393 while ((1UL << log2) < max_size)
1394 ++log2;
1395
1396 self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
1397
1398 XPUSHs (ST (0));
1399}
1400
1401void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
1402 PPCODE:
1403{
1404 SvREFCNT_dec (self->cb_object);
1405 self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
1406
1407 XPUSHs (ST (0));
1408}
1409
1410void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
1411 PPCODE:
1412{
1413 if (!self->cb_sk_object)
1414 self->cb_sk_object = newHV ();
1415
1416 if (SvOK (cb))
1417 hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
1418 else
791 { 1419 {
792 decode_hexdigit ['a' + i] = 10 + i; 1420 hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
793 decode_hexdigit ['A' + i] = 10 + i; 1421
1422 if (!HvKEYS (self->cb_sk_object))
1423 {
1424 SvREFCNT_dec (self->cb_sk_object);
1425 self->cb_sk_object = 0;
1426 }
794 } 1427 }
795 1428
796 json_stash = gv_stashpv ("JSON::XS", 1); 1429 XPUSHs (ST (0));
797} 1430}
798 1431
799SV *new (char *dummy) 1432void encode (JSON *self, SV *scalar)
1433 PPCODE:
1434 XPUSHs (encode_json (scalar, self));
1435
1436void decode (JSON *self, SV *jsonstr)
1437 PPCODE:
1438 XPUSHs (decode_json (jsonstr, self, 0));
1439
1440void decode_prefix (JSON *self, SV *jsonstr)
1441 PPCODE:
1442{
1443 UV offset;
1444 EXTEND (SP, 2);
1445 PUSHs (decode_json (jsonstr, self, &offset));
1446 PUSHs (sv_2mortal (newSVuv (offset)));
1447}
1448
1449void DESTROY (JSON *self)
800 CODE: 1450 CODE:
801 RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash); 1451 SvREFCNT_dec (self->cb_sk_object);
802 OUTPUT: 1452 SvREFCNT_dec (self->cb_object);
803 RETVAL
804 1453
805SV *ascii (SV *self, int enable) 1454PROTOTYPES: 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 1455
822 RETVAL = newSVsv (self); 1456void to_json (SV *scalar)
823}
824 OUTPUT:
825 RETVAL
826
827void encode (SV *self, SV *scalar)
828 PPCODE: 1457 PPCODE:
1458{
1459 JSON json = { F_DEFAULT | F_UTF8 };
829 XPUSHs (encode_json (scalar, *SvJSON (self))); 1460 XPUSHs (encode_json (scalar, &json));
1461}
830 1462
831void decode (SV *self, SV *jsondata) 1463void from_json (SV *jsonstr)
832 PPCODE: 1464 PPCODE:
1465{
1466 JSON json = { F_DEFAULT | F_UTF8 };
833 XPUSHs (decode_json (jsondata, *SvJSON (self))); 1467 XPUSHs (decode_json (jsonstr, &json, 0));
1468}
834 1469

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