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Comparing JSON-XS/XS.xs (file contents):
Revision 1.12 by root, Sat Mar 24 22:10:08 2007 UTC vs.
Revision 1.55 by root, Mon Jul 23 22:57:40 2007 UTC

… …
3#include "XSUB.h" 3#include "XSUB.h"
4 4
5#include "assert.h" 5#include "assert.h"
6#include "string.h" 6#include "string.h"
7#include "stdlib.h" 7#include "stdlib.h"
8#include "stdio.h"
8 9
10#if defined(__BORLANDC__) || defined(_MSC_VER)
11# define snprintf _snprintf // C compilers have this in stdio.h
12#endif
13
14// some old perls do not have this, try to make it work, no
15// guarentees, though. if it breaks, you get to keep the pieces.
16#ifndef UTF8_MAXBYTES
17# define UTF8_MAXBYTES 13
18#endif
19
9#define F_ASCII 0x00000001 20#define F_ASCII 0x00000001UL
21#define F_LATIN1 0x00000002UL
10#define F_UTF8 0x00000002 22#define F_UTF8 0x00000004UL
11#define F_INDENT 0x00000004 23#define F_INDENT 0x00000008UL
12#define F_CANONICAL 0x00000008 24#define F_CANONICAL 0x00000010UL
13#define F_SPACE_BEFORE 0x00000010 25#define F_SPACE_BEFORE 0x00000020UL
14#define F_SPACE_AFTER 0x00000020 26#define F_SPACE_AFTER 0x00000040UL
15#define F_ALLOW_NONREF 0x00000080 27#define F_ALLOW_NONREF 0x00000100UL
16#define F_SHRINK 0x00000100 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
22#define INDENT_STEP 3 // spaces per indentation level 44#define INDENT_STEP 3 // spaces per indentation level
23 45
24#define UTF8_MAX_LEN 11 // for perls UTF-X: max. number of octets per character
25#define SHORT_STRING_LEN 256 // special-case strings of up to this size 46#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
26 47
27#define SB do { 48#define SB do {
28#define SE } while (0) 49#define SE } while (0)
29 50
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
30static HV *json_stash; // JSON::XS:: 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;
31 70
32///////////////////////////////////////////////////////////////////////////// 71/////////////////////////////////////////////////////////////////////////////
33// utility functions 72// utility functions
34 73
35static UV * 74inline void
36SvJSON (SV *sv)
37{
38 if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
39 croak ("object is not of type JSON::XS");
40
41 return &SvUVX (SvRV (sv));
42}
43
44static void
45shrink (SV *sv) 75shrink (SV *sv)
46{ 76{
47 sv_utf8_downgrade (sv, 1); 77 sv_utf8_downgrade (sv, 1);
48 if (SvLEN (sv) > SvCUR (sv) + 1) 78 if (SvLEN (sv) > SvCUR (sv) + 1)
49 { 79 {
… …
53 SvPV_renew (sv, SvCUR (sv) + 1); 83 SvPV_renew (sv, SvCUR (sv) + 1);
54#endif 84#endif
55 } 85 }
56} 86}
57 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
58///////////////////////////////////////////////////////////////////////////// 110/////////////////////////////////////////////////////////////////////////////
59// encoder 111// encoder
60 112
61// structure used for encoding JSON 113// structure used for encoding JSON
62typedef struct 114typedef struct
63{ 115{
64 char *cur; // SvPVX (sv) + current output position 116 char *cur; // SvPVX (sv) + current output position
65 char *end; // SvEND (sv) 117 char *end; // SvEND (sv)
66 SV *sv; // result scalar 118 SV *sv; // result scalar
67 UV flags; // F_* 119 JSON json;
68 int indent; // indentation level 120 U32 indent; // indentation level
69 int max_depth; // max. recursion level 121 U32 maxdepth; // max. indentation/recursion level
70} enc_t; 122} enc_t;
71 123
72static void 124inline void
73need (enc_t *enc, STRLEN len) 125need (enc_t *enc, STRLEN len)
74{ 126{
75 if (enc->cur + len >= enc->end) 127 if (expect_false (enc->cur + len >= enc->end))
76 { 128 {
77 STRLEN cur = enc->cur - SvPVX (enc->sv); 129 STRLEN cur = enc->cur - SvPVX (enc->sv);
78 SvGROW (enc->sv, cur + len + 1); 130 SvGROW (enc->sv, cur + len + 1);
79 enc->cur = SvPVX (enc->sv) + cur; 131 enc->cur = SvPVX (enc->sv) + cur;
80 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv); 132 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
81 } 133 }
82} 134}
83 135
84static void 136inline void
85encode_ch (enc_t *enc, char ch) 137encode_ch (enc_t *enc, char ch)
86{ 138{
87 need (enc, 1); 139 need (enc, 1);
88 *enc->cur++ = ch; 140 *enc->cur++ = ch;
89} 141}
… …
97 149
98 while (str < end) 150 while (str < end)
99 { 151 {
100 unsigned char ch = *(unsigned char *)str; 152 unsigned char ch = *(unsigned char *)str;
101 153
102 if (ch >= 0x20 && ch < 0x80) // most common case 154 if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
103 { 155 {
104 if (ch == '"') // but with slow exceptions 156 if (expect_false (ch == '"')) // but with slow exceptions
105 { 157 {
106 need (enc, len += 1); 158 need (enc, len += 1);
107 *enc->cur++ = '\\'; 159 *enc->cur++ = '\\';
108 *enc->cur++ = '"'; 160 *enc->cur++ = '"';
109 } 161 }
110 else if (ch == '\\') 162 else if (expect_false (ch == '\\'))
111 { 163 {
112 need (enc, len += 1); 164 need (enc, len += 1);
113 *enc->cur++ = '\\'; 165 *enc->cur++ = '\\';
114 *enc->cur++ = '\\'; 166 *enc->cur++ = '\\';
115 } 167 }
… …
133 STRLEN clen; 185 STRLEN clen;
134 UV uch; 186 UV uch;
135 187
136 if (is_utf8) 188 if (is_utf8)
137 { 189 {
138 uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY); 190 uch = decode_utf8 (str, end - str, &clen);
139 if (clen == (STRLEN)-1) 191 if (clen == (STRLEN)-1)
140 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str); 192 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
141 } 193 }
142 else 194 else
143 { 195 {
… …
146 } 198 }
147 199
148 if (uch > 0x10FFFFUL) 200 if (uch > 0x10FFFFUL)
149 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch); 201 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
150 202
151 if (uch < 0x80 || enc->flags & F_ASCII) 203 if (uch < 0x80 || enc->json.flags & F_ASCII || (enc->json.flags & F_LATIN1 && uch > 0xFF))
152 { 204 {
153 if (uch > 0xFFFFUL) 205 if (uch > 0xFFFFUL)
154 { 206 {
155 need (enc, len += 11); 207 need (enc, len += 11);
156 sprintf (enc->cur, "\\u%04x\\u%04x", 208 sprintf (enc->cur, "\\u%04x\\u%04x",
… …
170 *enc->cur++ = hexdigit [(uch >> 0) & 15]; 222 *enc->cur++ = hexdigit [(uch >> 0) & 15];
171 } 223 }
172 224
173 str += clen; 225 str += clen;
174 } 226 }
227 else if (enc->json.flags & F_LATIN1)
228 {
229 *enc->cur++ = uch;
230 str += clen;
231 }
175 else if (is_utf8) 232 else if (is_utf8)
176 { 233 {
177 need (enc, len += clen); 234 need (enc, len += clen);
178 do 235 do
179 { 236 {
… …
181 } 238 }
182 while (--clen); 239 while (--clen);
183 } 240 }
184 else 241 else
185 { 242 {
186 need (enc, len += UTF8_MAX_LEN - 1); // never more than 11 bytes needed 243 need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
187 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0); 244 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
188 ++str; 245 ++str;
189 } 246 }
190 } 247 }
191 } 248 }
… …
193 250
194 --len; 251 --len;
195 } 252 }
196} 253}
197 254
198static void 255inline void
199encode_indent (enc_t *enc) 256encode_indent (enc_t *enc)
200{ 257{
201 if (enc->flags & F_INDENT) 258 if (enc->json.flags & F_INDENT)
202 { 259 {
203 int spaces = enc->indent * INDENT_STEP; 260 int spaces = enc->indent * INDENT_STEP;
204 261
205 need (enc, spaces); 262 need (enc, spaces);
206 memset (enc->cur, ' ', spaces); 263 memset (enc->cur, ' ', spaces);
207 enc->cur += spaces; 264 enc->cur += spaces;
208 } 265 }
209} 266}
210 267
211static void 268inline void
212encode_space (enc_t *enc) 269encode_space (enc_t *enc)
213{ 270{
214 need (enc, 1); 271 need (enc, 1);
215 encode_ch (enc, ' '); 272 encode_ch (enc, ' ');
216} 273}
217 274
218static void 275inline void
219encode_nl (enc_t *enc) 276encode_nl (enc_t *enc)
220{ 277{
221 if (enc->flags & F_INDENT) 278 if (enc->json.flags & F_INDENT)
222 { 279 {
223 need (enc, 1); 280 need (enc, 1);
224 encode_ch (enc, '\n'); 281 encode_ch (enc, '\n');
225 } 282 }
226} 283}
227 284
228static void 285inline void
229encode_comma (enc_t *enc) 286encode_comma (enc_t *enc)
230{ 287{
231 encode_ch (enc, ','); 288 encode_ch (enc, ',');
232 289
233 if (enc->flags & F_INDENT) 290 if (enc->json.flags & F_INDENT)
234 encode_nl (enc); 291 encode_nl (enc);
235 else if (enc->flags & F_SPACE_AFTER) 292 else if (enc->json.flags & F_SPACE_AFTER)
236 encode_space (enc); 293 encode_space (enc);
237} 294}
238 295
239static void encode_sv (enc_t *enc, SV *sv); 296static void encode_sv (enc_t *enc, SV *sv);
240 297
241static void 298static void
242encode_av (enc_t *enc, AV *av) 299encode_av (enc_t *enc, AV *av)
243{ 300{
244 int i, len = av_len (av); 301 int i, len = av_len (av);
245 302
303 if (enc->indent >= enc->maxdepth)
304 croak ("data structure too deep (hit recursion limit)");
305
246 encode_ch (enc, '['); encode_nl (enc); 306 encode_ch (enc, '['); encode_nl (enc);
247 ++enc->indent; 307 ++enc->indent;
248 308
249 for (i = 0; i <= len; ++i) 309 for (i = 0; i <= len; ++i)
250 { 310 {
311 SV **svp = av_fetch (av, i, 0);
312
251 encode_indent (enc); 313 encode_indent (enc);
252 encode_sv (enc, *av_fetch (av, i, 0)); 314
315 if (svp)
316 encode_sv (enc, *svp);
317 else
318 encode_str (enc, "null", 4, 0);
253 319
254 if (i < len) 320 if (i < len)
255 encode_comma (enc); 321 encode_comma (enc);
256 } 322 }
257 323
… …
280 else 346 else
281 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he)); 347 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
282 348
283 encode_ch (enc, '"'); 349 encode_ch (enc, '"');
284 350
285 if (enc->flags & F_SPACE_BEFORE) encode_space (enc); 351 if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
286 encode_ch (enc, ':'); 352 encode_ch (enc, ':');
287 if (enc->flags & F_SPACE_AFTER ) encode_space (enc); 353 if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
288 encode_sv (enc, HeVAL (he)); 354 encode_sv (enc, HeVAL (he));
289} 355}
290 356
291// compare hash entries, used when all keys are bytestrings 357// compare hash entries, used when all keys are bytestrings
292static int 358static int
… …
315 381
316static void 382static void
317encode_hv (enc_t *enc, HV *hv) 383encode_hv (enc_t *enc, HV *hv)
318{ 384{
319 int count, i; 385 int count, i;
386
387 if (enc->indent >= enc->maxdepth)
388 croak ("data structure too deep (hit recursion limit)");
320 389
321 encode_ch (enc, '{'); encode_nl (enc); ++enc->indent; 390 encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
322 391
323 if ((count = hv_iterinit (hv))) 392 if ((count = hv_iterinit (hv)))
324 { 393 {
325 // for canonical output we have to sort by keys first 394 // for canonical output we have to sort by keys first
326 // actually, this is mostly due to the stupid so-called 395 // actually, this is mostly due to the stupid so-called
327 // security workaround added somewhere in 5.8.x. 396 // security workaround added somewhere in 5.8.x.
328 // that randomises hash orderings 397 // that randomises hash orderings
329 if (enc->flags & F_CANONICAL) 398 if (enc->json.flags & F_CANONICAL)
330 { 399 {
331 HE *he, *hes [count]; // if your compiler dies here, you need to enable C99 mode
332 int fast = 1; 400 int fast = 1;
401 HE *he;
402#if defined(__BORLANDC__) || defined(_MSC_VER)
403 HE **hes = _alloca (count * sizeof (HE));
404#else
405 HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
406#endif
333 407
334 i = 0; 408 i = 0;
335 while ((he = hv_iternext (hv))) 409 while ((he = hv_iternext (hv)))
336 { 410 {
337 hes [i++] = he; 411 hes [i++] = he;
… …
372 446
373 encode_nl (enc); 447 encode_nl (enc);
374 } 448 }
375 else 449 else
376 { 450 {
377 SV *sv;
378 HE *he = hv_iternext (hv); 451 HE *he = hv_iternext (hv);
379 452
380 for (;;) 453 for (;;)
381 { 454 {
382 encode_indent (enc); 455 encode_indent (enc);
… …
391 encode_nl (enc); 464 encode_nl (enc);
392 } 465 }
393 } 466 }
394 467
395 --enc->indent; encode_indent (enc); encode_ch (enc, '}'); 468 --enc->indent; encode_indent (enc); encode_ch (enc, '}');
469}
470
471// encode objects, arrays and special \0=false and \1=true values.
472static void
473encode_rv (enc_t *enc, SV *sv)
474{
475 svtype svt;
476
477 SvGETMAGIC (sv);
478 svt = SvTYPE (sv);
479
480 if (expect_false (SvOBJECT (sv)))
481 {
482 if (SvSTASH (sv) == json_boolean_stash)
483 {
484 if (SvIV (sv))
485 encode_str (enc, "true", 4, 0);
486 else
487 encode_str (enc, "false", 5, 0);
488 }
489 else
490 {
491#if 0
492 if (0 && sv_derived_from (rv, "JSON::Literal"))
493 {
494 // not yet
495 }
496#endif
497 if (enc->json.flags & F_CONV_BLESSED)
498 {
499 // we re-bless the reference to get overload and other niceties right
500 GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
501
502 if (to_json)
503 {
504 int count;
505 dSP;
506
507 ENTER; SAVETMPS; PUSHMARK (SP);
508 XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
509
510 // calling with G_SCALAR ensures that we always get a 1 return value
511 PUTBACK;
512 call_sv ((SV *)GvCV (to_json), G_SCALAR);
513 SPAGAIN;
514
515 // catch this surprisingly common error
516 if (SvROK (TOPs) && SvRV (TOPs) == sv)
517 croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
518
519 sv = POPs;
520 PUTBACK;
521
522 encode_sv (enc, sv);
523
524 FREETMPS; LEAVE;
525 }
526 else if (enc->json.flags & F_ALLOW_BLESSED)
527 encode_str (enc, "null", 4, 0);
528 else
529 croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
530 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
531 }
532 else if (enc->json.flags & F_ALLOW_BLESSED)
533 encode_str (enc, "null", 4, 0);
534 else
535 croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
536 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
537 }
538 }
539 else if (svt == SVt_PVHV)
540 encode_hv (enc, (HV *)sv);
541 else if (svt == SVt_PVAV)
542 encode_av (enc, (AV *)sv);
543 else if (svt < SVt_PVAV)
544 {
545 STRLEN len = 0;
546 char *pv = svt ? SvPV (sv, len) : 0;
547
548 if (len == 1 && *pv == '1')
549 encode_str (enc, "true", 4, 0);
550 else if (len == 1 && *pv == '0')
551 encode_str (enc, "false", 5, 0);
552 else
553 croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
554 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
555 }
556 else
557 croak ("encountered %s, but JSON can only represent references to arrays or hashes",
558 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
396} 559}
397 560
398static void 561static void
399encode_sv (enc_t *enc, SV *sv) 562encode_sv (enc_t *enc, SV *sv)
400{ 563{
… …
408 encode_str (enc, str, len, SvUTF8 (sv)); 571 encode_str (enc, str, len, SvUTF8 (sv));
409 encode_ch (enc, '"'); 572 encode_ch (enc, '"');
410 } 573 }
411 else if (SvNOKp (sv)) 574 else if (SvNOKp (sv))
412 { 575 {
576 // trust that perl will do the right thing w.r.t. JSON syntax.
413 need (enc, NV_DIG + 32); 577 need (enc, NV_DIG + 32);
414 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 578 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
415 enc->cur += strlen (enc->cur); 579 enc->cur += strlen (enc->cur);
416 } 580 }
417 else if (SvIOKp (sv)) 581 else if (SvIOKp (sv))
418 { 582 {
419 need (enc, 64); 583 // we assume we can always read an IV as a UV
584 if (SvUV (sv) & ~(UV)0x7fff)
585 {
586 // large integer, use the (rather slow) snprintf way.
587 need (enc, sizeof (UV) * 3);
420 enc->cur += 588 enc->cur +=
421 SvIsUV(sv) 589 SvIsUV(sv)
422 ? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv)) 590 ? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
423 : snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv)); 591 : snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
592 }
593 else
594 {
595 // optimise the "small number case"
596 // code will likely be branchless and use only a single multiplication
597 I32 i = SvIV (sv);
598 U32 u;
599 char digit, nz = 0;
600
601 need (enc, 6);
602
603 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
604 u = i < 0 ? -i : i;
605
606 // convert to 4.28 fixed-point representation
607 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
608
609 // now output digit by digit, each time masking out the integer part
610 // and multiplying by 5 while moving the decimal point one to the right,
611 // resulting in a net multiplication by 10.
612 // we always write the digit to memory but conditionally increment
613 // the pointer, to ease the usage of conditional move instructions.
614 digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
615 digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
616 digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
617 digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
618 digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
619 }
424 } 620 }
425 else if (SvROK (sv)) 621 else if (SvROK (sv))
426 { 622 encode_rv (enc, SvRV (sv));
427 SV *rv = SvRV (sv);
428
429 if (enc->indent >= enc->max_depth)
430 croak ("data structure too deep (hit recursion limit)");
431
432 switch (SvTYPE (rv))
433 {
434 case SVt_PVAV: encode_av (enc, (AV *)rv); break;
435 case SVt_PVHV: encode_hv (enc, (HV *)rv); break;
436
437 default:
438 croak ("encountered %s, but JSON can only represent references to arrays or hashes",
439 SvPV_nolen (sv));
440 }
441 }
442 else if (!SvOK (sv)) 623 else if (!SvOK (sv))
443 encode_str (enc, "null", 4, 0); 624 encode_str (enc, "null", 4, 0);
444 else 625 else
445 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this", 626 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
446 SvPV_nolen (sv), SvFLAGS (sv)); 627 SvPV_nolen (sv), SvFLAGS (sv));
447} 628}
448 629
449static SV * 630static SV *
450encode_json (SV *scalar, UV flags) 631encode_json (SV *scalar, JSON *json)
451{ 632{
633 enc_t enc;
634
452 if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar)) 635 if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
453 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)"); 636 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
454 637
455 enc_t enc; 638 enc.json = *json;
456 enc.flags = flags;
457 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE)); 639 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
458 enc.cur = SvPVX (enc.sv); 640 enc.cur = SvPVX (enc.sv);
459 enc.end = SvEND (enc.sv); 641 enc.end = SvEND (enc.sv);
460 enc.indent = 0; 642 enc.indent = 0;
461 enc.max_depth = 0x7fffffffUL; 643 enc.maxdepth = DEC_DEPTH (enc.json.flags);
462 644
463 SvPOK_only (enc.sv); 645 SvPOK_only (enc.sv);
464 encode_sv (&enc, scalar); 646 encode_sv (&enc, scalar);
465 647
648 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
649 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
650
466 if (!(flags & (F_ASCII | F_UTF8))) 651 if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
467 SvUTF8_on (enc.sv); 652 SvUTF8_on (enc.sv);
468 653
469 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
470
471 if (enc.flags & F_SHRINK) 654 if (enc.json.flags & F_SHRINK)
472 shrink (enc.sv); 655 shrink (enc.sv);
473 656
474 return enc.sv; 657 return enc.sv;
475} 658}
476 659
… …
481typedef struct 664typedef struct
482{ 665{
483 char *cur; // current parser pointer 666 char *cur; // current parser pointer
484 char *end; // end of input string 667 char *end; // end of input string
485 const char *err; // parse error, if != 0 668 const char *err; // parse error, if != 0
486 UV flags; // F_* 669 JSON json;
670 U32 depth; // recursion depth
671 U32 maxdepth; // recursion depth limit
487} dec_t; 672} dec_t;
488 673
489static void 674inline void
490decode_ws (dec_t *dec) 675decode_ws (dec_t *dec)
491{ 676{
492 for (;;) 677 for (;;)
493 { 678 {
494 char ch = *dec->cur; 679 char ch = *dec->cur;
… …
500 ++dec->cur; 685 ++dec->cur;
501 } 686 }
502} 687}
503 688
504#define ERR(reason) SB dec->err = reason; goto fail; SE 689#define ERR(reason) SB dec->err = reason; goto fail; SE
690
505#define EXPECT_CH(ch) SB \ 691#define EXPECT_CH(ch) SB \
506 if (*dec->cur != ch) \ 692 if (*dec->cur != ch) \
507 ERR (# ch " expected"); \ 693 ERR (# ch " expected"); \
508 ++dec->cur; \ 694 ++dec->cur; \
509 SE 695 SE
510 696
697#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
698#define DEC_DEC_DEPTH --dec->depth
699
511static SV *decode_sv (dec_t *dec); 700static SV *decode_sv (dec_t *dec);
512 701
513static signed char decode_hexdigit[256]; 702static signed char decode_hexdigit[256];
514 703
515static UV 704static UV
516decode_4hex (dec_t *dec) 705decode_4hex (dec_t *dec)
517{ 706{
518 signed char d1, d2, d3, d4; 707 signed char d1, d2, d3, d4;
519 unsigned char *cur = (unsigned char *)dec->cur; 708 unsigned char *cur = (unsigned char *)dec->cur;
520 709
521 d1 = decode_hexdigit [cur [0]]; if (d1 < 0) ERR ("four hexadecimal digits expected"); 710 d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
522 d2 = decode_hexdigit [cur [1]]; if (d2 < 0) ERR ("four hexadecimal digits expected"); 711 d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
523 d3 = decode_hexdigit [cur [2]]; if (d3 < 0) ERR ("four hexadecimal digits expected"); 712 d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
524 d4 = decode_hexdigit [cur [3]]; if (d4 < 0) ERR ("four hexadecimal digits expected"); 713 d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
525 714
526 dec->cur += 4; 715 dec->cur += 4;
527 716
528 return ((UV)d1) << 12 717 return ((UV)d1) << 12
529 | ((UV)d2) << 8 718 | ((UV)d2) << 8
… …
537static SV * 726static SV *
538decode_str (dec_t *dec) 727decode_str (dec_t *dec)
539{ 728{
540 SV *sv = 0; 729 SV *sv = 0;
541 int utf8 = 0; 730 int utf8 = 0;
731 char *dec_cur = dec->cur;
542 732
543 do 733 do
544 { 734 {
545 char buf [SHORT_STRING_LEN + UTF8_MAX_LEN]; 735 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
546 char *cur = buf; 736 char *cur = buf;
547 737
548 do 738 do
549 { 739 {
550 unsigned char ch = *(unsigned char *)dec->cur++; 740 unsigned char ch = *(unsigned char *)dec_cur++;
551 741
552 if (ch == '"') 742 if (expect_false (ch == '"'))
553 { 743 {
554 --dec->cur; 744 --dec_cur;
555 break; 745 break;
556 } 746 }
557 else if (ch == '\\') 747 else if (expect_false (ch == '\\'))
558 { 748 {
559 switch (*dec->cur) 749 switch (*dec_cur)
560 { 750 {
561 case '\\': 751 case '\\':
562 case '/': 752 case '/':
563 case '"': *cur++ = *dec->cur++; break; 753 case '"': *cur++ = *dec_cur++; break;
564 754
565 case 'b': ++dec->cur; *cur++ = '\010'; break; 755 case 'b': ++dec_cur; *cur++ = '\010'; break;
566 case 't': ++dec->cur; *cur++ = '\011'; break; 756 case 't': ++dec_cur; *cur++ = '\011'; break;
567 case 'n': ++dec->cur; *cur++ = '\012'; break; 757 case 'n': ++dec_cur; *cur++ = '\012'; break;
568 case 'f': ++dec->cur; *cur++ = '\014'; break; 758 case 'f': ++dec_cur; *cur++ = '\014'; break;
569 case 'r': ++dec->cur; *cur++ = '\015'; break; 759 case 'r': ++dec_cur; *cur++ = '\015'; break;
570 760
571 case 'u': 761 case 'u':
572 { 762 {
573 UV lo, hi; 763 UV lo, hi;
574 ++dec->cur; 764 ++dec_cur;
575 765
766 dec->cur = dec_cur;
576 hi = decode_4hex (dec); 767 hi = decode_4hex (dec);
768 dec_cur = dec->cur;
577 if (hi == (UV)-1) 769 if (hi == (UV)-1)
578 goto fail; 770 goto fail;
579 771
580 // possibly a surrogate pair 772 // possibly a surrogate pair
581 if (hi >= 0xd800) 773 if (hi >= 0xd800)
582 if (hi < 0xdc00) 774 if (hi < 0xdc00)
583 { 775 {
584 if (dec->cur [0] != '\\' || dec->cur [1] != 'u') 776 if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
585 ERR ("missing low surrogate character in surrogate pair"); 777 ERR ("missing low surrogate character in surrogate pair");
586 778
587 dec->cur += 2; 779 dec_cur += 2;
588 780
781 dec->cur = dec_cur;
589 lo = decode_4hex (dec); 782 lo = decode_4hex (dec);
783 dec_cur = dec->cur;
590 if (lo == (UV)-1) 784 if (lo == (UV)-1)
591 goto fail; 785 goto fail;
592 786
593 if (lo < 0xdc00 || lo >= 0xe000) 787 if (lo < 0xdc00 || lo >= 0xe000)
594 ERR ("surrogate pair expected"); 788 ERR ("surrogate pair expected");
… …
608 *cur++ = hi; 802 *cur++ = hi;
609 } 803 }
610 break; 804 break;
611 805
612 default: 806 default:
613 --dec->cur; 807 --dec_cur;
614 ERR ("illegal backslash escape sequence in string"); 808 ERR ("illegal backslash escape sequence in string");
615 } 809 }
616 } 810 }
617 else if (ch >= 0x20 && ch <= 0x7f) 811 else if (expect_true (ch >= 0x20 && ch <= 0x7f))
618 *cur++ = ch; 812 *cur++ = ch;
619 else if (ch >= 0x80) 813 else if (ch >= 0x80)
620 { 814 {
621 --dec->cur;
622
623 STRLEN clen; 815 STRLEN clen;
624 UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY); 816 UV uch;
817
818 --dec_cur;
819
820 uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
625 if (clen == (STRLEN)-1) 821 if (clen == (STRLEN)-1)
626 ERR ("malformed UTF-8 character in JSON string"); 822 ERR ("malformed UTF-8 character in JSON string");
627 823
628 do 824 do
629 {
630 *cur++ = *dec->cur++; 825 *cur++ = *dec_cur++;
631 }
632 while (--clen); 826 while (--clen);
633 827
634 utf8 = 1; 828 utf8 = 1;
635 } 829 }
636 else if (!ch)
637 ERR ("unexpected end of string while parsing json string");
638 else 830 else
831 {
832 --dec_cur;
833
834 if (!ch)
835 ERR ("unexpected end of string while parsing JSON string");
836 else
639 ERR ("invalid character encountered"); 837 ERR ("invalid character encountered while parsing JSON string");
640 838 }
641 } 839 }
642 while (cur < buf + SHORT_STRING_LEN); 840 while (cur < buf + SHORT_STRING_LEN);
643 841
842 {
644 STRLEN len = cur - buf; 843 STRLEN len = cur - buf;
645 844
646 if (sv) 845 if (sv)
647 { 846 {
648 SvGROW (sv, SvCUR (sv) + len + 1); 847 SvGROW (sv, SvCUR (sv) + len + 1);
649 memcpy (SvPVX (sv) + SvCUR (sv), buf, len); 848 memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
650 SvCUR_set (sv, SvCUR (sv) + len); 849 SvCUR_set (sv, SvCUR (sv) + len);
651 } 850 }
652 else 851 else
653 sv = newSVpvn (buf, len); 852 sv = newSVpvn (buf, len);
654 } 853 }
854 }
655 while (*dec->cur != '"'); 855 while (*dec_cur != '"');
656 856
657 ++dec->cur; 857 ++dec_cur;
658 858
659 if (sv) 859 if (sv)
660 { 860 {
661 SvPOK_only (sv); 861 SvPOK_only (sv);
662 *SvEND (sv) = 0; 862 *SvEND (sv) = 0;
… …
665 SvUTF8_on (sv); 865 SvUTF8_on (sv);
666 } 866 }
667 else 867 else
668 sv = newSVpvn ("", 0); 868 sv = newSVpvn ("", 0);
669 869
870 dec->cur = dec_cur;
670 return sv; 871 return sv;
671 872
672fail: 873fail:
874 dec->cur = dec_cur;
673 return 0; 875 return 0;
674} 876}
675 877
676static SV * 878static SV *
677decode_num (dec_t *dec) 879decode_num (dec_t *dec)
… …
735 is_nv = 1; 937 is_nv = 1;
736 } 938 }
737 939
738 if (!is_nv) 940 if (!is_nv)
739 { 941 {
740 UV uv; 942 // special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
741 int numtype = grok_number (start, dec->cur - start, &uv); 943 if (*start == '-')
742 if (numtype & IS_NUMBER_IN_UV) 944 switch (dec->cur - start)
743 if (numtype & IS_NUMBER_NEG)
744 { 945 {
745 if (uv < (UV)IV_MIN) 946 case 2: return newSViv (-( start [1] - '0' * 1));
746 return newSViv (-(IV)uv); 947 case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
948 case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
949 case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
747 } 950 }
951 else
952 switch (dec->cur - start)
953 {
954 case 1: return newSViv ( start [0] - '0' * 1);
955 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
956 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
957 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
958 }
959
960 {
961 UV uv;
962 int numtype = grok_number (start, dec->cur - start, &uv);
963 if (numtype & IS_NUMBER_IN_UV)
964 if (numtype & IS_NUMBER_NEG)
965 {
966 if (uv < (UV)IV_MIN)
967 return newSViv (-(IV)uv);
968 }
748 else 969 else
749 return newSVuv (uv); 970 return newSVuv (uv);
971
972 // here would likely be the place for bigint support
750 } 973 }
974 }
751 975
976 // if we ever support bigint or bigfloat, this is the place for bigfloat
752 return newSVnv (Atof (start)); 977 return newSVnv (Atof (start));
753 978
754fail: 979fail:
755 return 0; 980 return 0;
756} 981}
… …
758static SV * 983static SV *
759decode_av (dec_t *dec) 984decode_av (dec_t *dec)
760{ 985{
761 AV *av = newAV (); 986 AV *av = newAV ();
762 987
988 DEC_INC_DEPTH;
763 decode_ws (dec); 989 decode_ws (dec);
990
764 if (*dec->cur == ']') 991 if (*dec->cur == ']')
765 ++dec->cur; 992 ++dec->cur;
766 else 993 else
767 for (;;) 994 for (;;)
768 { 995 {
… …
786 ERR (", or ] expected while parsing array"); 1013 ERR (", or ] expected while parsing array");
787 1014
788 ++dec->cur; 1015 ++dec->cur;
789 } 1016 }
790 1017
1018 DEC_DEC_DEPTH;
791 return newRV_noinc ((SV *)av); 1019 return newRV_noinc ((SV *)av);
792 1020
793fail: 1021fail:
794 SvREFCNT_dec (av); 1022 SvREFCNT_dec (av);
1023 DEC_DEC_DEPTH;
795 return 0; 1024 return 0;
796} 1025}
797 1026
798static SV * 1027static SV *
799decode_hv (dec_t *dec) 1028decode_hv (dec_t *dec)
800{ 1029{
1030 SV *sv;
801 HV *hv = newHV (); 1031 HV *hv = newHV ();
802 1032
1033 DEC_INC_DEPTH;
803 decode_ws (dec); 1034 decode_ws (dec);
1035
804 if (*dec->cur == '}') 1036 if (*dec->cur == '}')
805 ++dec->cur; 1037 ++dec->cur;
806 else 1038 else
807 for (;;) 1039 for (;;)
808 { 1040 {
809 SV *key, *value;
810
811 decode_ws (dec); EXPECT_CH ('"'); 1041 decode_ws (dec); EXPECT_CH ('"');
812 1042
813 key = decode_str (dec); 1043 // heuristic: assume that
814 if (!key) 1044 // a) decode_str + hv_store_ent are abysmally slow.
815 goto fail; 1045 // b) most hash keys are short, simple ascii text.
1046 // => try to "fast-match" such strings to avoid
1047 // the overhead of decode_str + hv_store_ent.
1048 {
1049 SV *value;
1050 char *p = dec->cur;
1051 char *e = p + 24; // only try up to 24 bytes
816 1052
817 decode_ws (dec); EXPECT_CH (':'); 1053 for (;;)
818
819 value = decode_sv (dec);
820 if (!value)
821 { 1054 {
1055 // the >= 0x80 is true on most architectures
1056 if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
1057 {
1058 // slow path, back up and use decode_str
1059 SV *key = decode_str (dec);
1060 if (!key)
1061 goto fail;
1062
1063 decode_ws (dec); EXPECT_CH (':');
1064
1065 value = decode_sv (dec);
1066 if (!value)
1067 {
1068 SvREFCNT_dec (key);
1069 goto fail;
1070 }
1071
1072 hv_store_ent (hv, key, value, 0);
822 SvREFCNT_dec (key); 1073 SvREFCNT_dec (key);
1074
1075 break;
1076 }
1077 else if (*p == '"')
1078 {
1079 // fast path, got a simple key
1080 char *key = dec->cur;
1081 int len = p - key;
1082 dec->cur = p + 1;
1083
1084 decode_ws (dec); EXPECT_CH (':');
1085
1086 value = decode_sv (dec);
1087 if (!value)
823 goto fail; 1088 goto fail;
1089
1090 hv_store (hv, key, len, value, 0);
1091
1092 break;
1093 }
1094
1095 ++p;
824 } 1096 }
825 1097 }
826 //TODO: optimise
827 hv_store_ent (hv, key, value, 0);
828 1098
829 decode_ws (dec); 1099 decode_ws (dec);
830 1100
831 if (*dec->cur == '}') 1101 if (*dec->cur == '}')
832 { 1102 {
… …
838 ERR (", or } expected while parsing object/hash"); 1108 ERR (", or } expected while parsing object/hash");
839 1109
840 ++dec->cur; 1110 ++dec->cur;
841 } 1111 }
842 1112
1113 DEC_DEC_DEPTH;
843 return newRV_noinc ((SV *)hv); 1114 sv = newRV_noinc ((SV *)hv);
1115
1116 // check filter callbacks
1117 if (dec->json.flags & F_HOOK)
1118 {
1119 if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
1120 {
1121 HE *cb, *he;
1122
1123 hv_iterinit (hv);
1124 he = hv_iternext (hv);
1125 hv_iterinit (hv);
1126
1127 // the next line creates a mortal sv each time its called.
1128 // might want to optimise this for common cases.
1129 cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
1130
1131 if (cb)
1132 {
1133 dSP;
1134 int count;
1135
1136 ENTER; SAVETMPS; PUSHMARK (SP);
1137 XPUSHs (HeVAL (he));
1138
1139 PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
1140
1141 if (count == 1)
1142 {
1143 sv = newSVsv (POPs);
1144 FREETMPS; LEAVE;
1145 return sv;
1146 }
1147
1148 FREETMPS; LEAVE;
1149 }
1150 }
1151
1152 if (dec->json.cb_object)
1153 {
1154 dSP;
1155 int count;
1156
1157 ENTER; SAVETMPS; PUSHMARK (SP);
1158 XPUSHs (sv_2mortal (sv));
1159
1160 PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
1161
1162 if (count == 1)
1163 {
1164 sv = newSVsv (POPs);
1165 FREETMPS; LEAVE;
1166 return sv;
1167 }
1168
1169 SvREFCNT_inc (sv);
1170 FREETMPS; LEAVE;
1171 }
1172 }
1173
1174 return sv;
844 1175
845fail: 1176fail:
846 SvREFCNT_dec (hv); 1177 SvREFCNT_dec (hv);
1178 DEC_DEC_DEPTH;
847 return 0; 1179 return 0;
848} 1180}
849 1181
850static SV * 1182static SV *
851decode_sv (dec_t *dec) 1183decode_sv (dec_t *dec)
852{ 1184{
853 decode_ws (dec); 1185 decode_ws (dec);
1186
1187 // the beauty of JSON: you need exactly one character lookahead
1188 // to parse anything.
854 switch (*dec->cur) 1189 switch (*dec->cur)
855 { 1190 {
856 case '"': ++dec->cur; return decode_str (dec); 1191 case '"': ++dec->cur; return decode_str (dec);
857 case '[': ++dec->cur; return decode_av (dec); 1192 case '[': ++dec->cur; return decode_av (dec);
858 case '{': ++dec->cur; return decode_hv (dec); 1193 case '{': ++dec->cur; return decode_hv (dec);
… …
864 1199
865 case 't': 1200 case 't':
866 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4)) 1201 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
867 { 1202 {
868 dec->cur += 4; 1203 dec->cur += 4;
869 return newSViv (1); 1204 return SvREFCNT_inc (json_true);
870 } 1205 }
871 else 1206 else
872 ERR ("'true' expected"); 1207 ERR ("'true' expected");
873 1208
874 break; 1209 break;
875 1210
876 case 'f': 1211 case 'f':
877 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5)) 1212 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
878 { 1213 {
879 dec->cur += 5; 1214 dec->cur += 5;
880 return newSViv (0); 1215 return SvREFCNT_inc (json_false);
881 } 1216 }
882 else 1217 else
883 ERR ("'false' expected"); 1218 ERR ("'false' expected");
884 1219
885 break; 1220 break;
… …
894 ERR ("'null' expected"); 1229 ERR ("'null' expected");
895 1230
896 break; 1231 break;
897 1232
898 default: 1233 default:
899 ERR ("malformed json string, neither array, object, number, string or atom"); 1234 ERR ("malformed JSON string, neither array, object, number, string or atom");
900 break; 1235 break;
901 } 1236 }
902 1237
903fail: 1238fail:
904 return 0; 1239 return 0;
905} 1240}
906 1241
907static SV * 1242static SV *
908decode_json (SV *string, UV flags) 1243decode_json (SV *string, JSON *json, UV *offset_return)
909{ 1244{
1245 dec_t dec;
1246 UV offset;
910 SV *sv; 1247 SV *sv;
911 1248
1249 SvGETMAGIC (string);
1250 SvUPGRADE (string, SVt_PV);
1251
1252 if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
1253 croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
1254 (unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
1255
912 if (flags & F_UTF8) 1256 if (json->flags & F_UTF8)
913 sv_utf8_downgrade (string, 0); 1257 sv_utf8_downgrade (string, 0);
914 else 1258 else
915 sv_utf8_upgrade (string); 1259 sv_utf8_upgrade (string);
916 1260
917 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP 1261 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
918 1262
919 dec_t dec; 1263 dec.json = *json;
920 dec.flags = flags;
921 dec.cur = SvPVX (string); 1264 dec.cur = SvPVX (string);
922 dec.end = SvEND (string); 1265 dec.end = SvEND (string);
923 dec.err = 0; 1266 dec.err = 0;
1267 dec.depth = 0;
1268 dec.maxdepth = DEC_DEPTH (dec.json.flags);
924 1269
1270 if (dec.json.cb_object || dec.json.cb_sk_object)
1271 dec.json.flags |= F_HOOK;
1272
1273 *dec.end = 0; // this should basically be a nop, too, but make sure it's there
925 sv = decode_sv (&dec); 1274 sv = decode_sv (&dec);
926 1275
1276 if (!(offset_return || !sv))
1277 {
1278 // check for trailing garbage
1279 decode_ws (&dec);
1280
1281 if (*dec.cur)
1282 {
1283 dec.err = "garbage after JSON object";
1284 SvREFCNT_dec (sv);
1285 sv = 0;
1286 }
1287 }
1288
1289 if (offset_return || !sv)
1290 {
1291 offset = dec.json.flags & F_UTF8
1292 ? dec.cur - SvPVX (string)
1293 : utf8_distance (dec.cur, SvPVX (string));
1294
1295 if (offset_return)
1296 *offset_return = offset;
1297 }
1298
927 if (!sv) 1299 if (!sv)
928 { 1300 {
929 IV offset = dec.flags & F_UTF8
930 ? dec.cur - SvPVX (string)
931 : utf8_distance (dec.cur, SvPVX (string));
932 SV *uni = sv_newmortal (); 1301 SV *uni = sv_newmortal ();
933 1302
934 // horrible hack to silence warning inside pv_uni_display 1303 // horrible hack to silence warning inside pv_uni_display
935 COP cop = *PL_curcop; 1304 COP cop = *PL_curcop;
936 cop.cop_warnings = pWARN_NONE; 1305 cop.cop_warnings = pWARN_NONE;
… …
938 SAVEVPTR (PL_curcop); 1307 SAVEVPTR (PL_curcop);
939 PL_curcop = &cop; 1308 PL_curcop = &cop;
940 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ); 1309 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
941 LEAVE; 1310 LEAVE;
942 1311
943 croak ("%s, at character offset %d (%s)", 1312 croak ("%s, at character offset %d [\"%s\"]",
944 dec.err, 1313 dec.err,
945 (int)offset, 1314 (int)offset,
946 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)"); 1315 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
947 } 1316 }
948 1317
949 sv = sv_2mortal (sv); 1318 sv = sv_2mortal (sv);
950 1319
951 if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv)) 1320 if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
952 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)"); 1321 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
953 1322
954 return sv; 1323 return sv;
955} 1324}
956 1325
… …
961 1330
962BOOT: 1331BOOT:
963{ 1332{
964 int i; 1333 int i;
965 1334
966 memset (decode_hexdigit, 0xff, 256);
967 for (i = 10; i--; ) 1335 for (i = 0; i < 256; ++i)
968 decode_hexdigit ['0' + i] = i; 1336 decode_hexdigit [i] =
1337 i >= '0' && i <= '9' ? i - '0'
1338 : i >= 'a' && i <= 'f' ? i - 'a' + 10
1339 : i >= 'A' && i <= 'F' ? i - 'A' + 10
1340 : -1;
969 1341
970 for (i = 7; i--; ) 1342 json_stash = gv_stashpv ("JSON::XS" , 1);
1343 json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
1344
1345 json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
1346 json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
1347}
1348
1349PROTOTYPES: DISABLE
1350
1351void new (char *klass)
1352 PPCODE:
1353{
1354 SV *pv = NEWSV (0, sizeof (JSON));
1355 SvPOK_only (pv);
1356 Zero (SvPVX (pv), 1, JSON);
1357 ((JSON *)SvPVX (pv))->flags = F_DEFAULT;
1358 XPUSHs (sv_2mortal (sv_bless (newRV_noinc (pv), json_stash)));
1359}
1360
1361void ascii (JSON *self, int enable = 1)
1362 ALIAS:
1363 ascii = F_ASCII
1364 latin1 = F_LATIN1
1365 utf8 = F_UTF8
1366 indent = F_INDENT
1367 canonical = F_CANONICAL
1368 space_before = F_SPACE_BEFORE
1369 space_after = F_SPACE_AFTER
1370 pretty = F_PRETTY
1371 allow_nonref = F_ALLOW_NONREF
1372 shrink = F_SHRINK
1373 allow_blessed = F_ALLOW_BLESSED
1374 convert_blessed = F_CONV_BLESSED
1375 PPCODE:
1376{
1377 if (enable)
1378 self->flags |= ix;
1379 else
1380 self->flags &= ~ix;
1381
1382 XPUSHs (ST (0));
1383}
1384
1385void max_depth (JSON *self, UV max_depth = 0x80000000UL)
1386 PPCODE:
1387{
1388 UV log2 = 0;
1389
1390 if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
1391
1392 while ((1UL << log2) < max_depth)
1393 ++log2;
1394
1395 self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
1396
1397 XPUSHs (ST (0));
1398}
1399
1400void max_size (JSON *self, UV max_size = 0)
1401 PPCODE:
1402{
1403 UV log2 = 0;
1404
1405 if (max_size > 0x80000000UL) max_size = 0x80000000UL;
1406 if (max_size == 1) max_size = 2;
1407
1408 while ((1UL << log2) < max_size)
1409 ++log2;
1410
1411 self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
1412
1413 XPUSHs (ST (0));
1414}
1415
1416void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
1417 PPCODE:
1418{
1419 SvREFCNT_dec (self->cb_object);
1420 self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
1421
1422 XPUSHs (ST (0));
1423}
1424
1425void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
1426 PPCODE:
1427{
1428 if (!self->cb_sk_object)
1429 self->cb_sk_object = newHV ();
1430
1431 if (SvOK (cb))
1432 hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
1433 else
971 { 1434 {
972 decode_hexdigit ['a' + i] = 10 + i; 1435 hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
973 decode_hexdigit ['A' + i] = 10 + i; 1436
1437 if (!HvKEYS (self->cb_sk_object))
1438 {
1439 SvREFCNT_dec (self->cb_sk_object);
1440 self->cb_sk_object = 0;
1441 }
974 } 1442 }
975 1443
976 json_stash = gv_stashpv ("JSON::XS", 1); 1444 XPUSHs (ST (0));
977} 1445}
978 1446
979PROTOTYPES: DISABLE 1447void encode (JSON *self, SV *scalar)
1448 PPCODE:
1449 XPUSHs (encode_json (scalar, self));
980 1450
981SV *new (char *dummy) 1451void decode (JSON *self, SV *jsonstr)
1452 PPCODE:
1453 XPUSHs (decode_json (jsonstr, self, 0));
1454
1455void decode_prefix (JSON *self, SV *jsonstr)
1456 PPCODE:
1457{
1458 UV offset;
1459 EXTEND (SP, 2);
1460 PUSHs (decode_json (jsonstr, self, &offset));
1461 PUSHs (sv_2mortal (newSVuv (offset)));
1462}
1463
1464void DESTROY (JSON *self)
982 CODE: 1465 CODE:
983 RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash); 1466 SvREFCNT_dec (self->cb_sk_object);
984 OUTPUT: 1467 SvREFCNT_dec (self->cb_object);
985 RETVAL
986
987SV *ascii (SV *self, int enable = 1)
988 ALIAS:
989 ascii = F_ASCII
990 utf8 = F_UTF8
991 indent = F_INDENT
992 canonical = F_CANONICAL
993 space_before = F_SPACE_BEFORE
994 space_after = F_SPACE_AFTER
995 pretty = F_PRETTY
996 allow_nonref = F_ALLOW_NONREF
997 shrink = F_SHRINK
998 CODE:
999{
1000 UV *uv = SvJSON (self);
1001 if (enable)
1002 *uv |= ix;
1003 else
1004 *uv &= ~ix;
1005
1006 RETVAL = newSVsv (self);
1007}
1008 OUTPUT:
1009 RETVAL
1010
1011void encode (SV *self, SV *scalar)
1012 PPCODE:
1013 XPUSHs (encode_json (scalar, *SvJSON (self)));
1014
1015void decode (SV *self, SV *jsonstr)
1016 PPCODE:
1017 XPUSHs (decode_json (jsonstr, *SvJSON (self)));
1018 1468
1019PROTOTYPES: ENABLE 1469PROTOTYPES: ENABLE
1020 1470
1021void to_json (SV *scalar) 1471void to_json (SV *scalar)
1022 PPCODE: 1472 PPCODE:
1473{
1474 JSON json = { F_DEFAULT | F_UTF8 };
1023 XPUSHs (encode_json (scalar, F_UTF8)); 1475 XPUSHs (encode_json (scalar, &json));
1476}
1024 1477
1025void from_json (SV *jsonstr) 1478void from_json (SV *jsonstr)
1026 PPCODE: 1479 PPCODE:
1480{
1481 JSON json = { F_DEFAULT | F_UTF8 };
1027 XPUSHs (decode_json (jsonstr, F_UTF8)); 1482 XPUSHs (decode_json (jsonstr, &json, 0));
1483}
1028 1484

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