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Comparing JSON-XS/XS.xs (file contents):
Revision 1.6 by root, Fri Mar 23 15:10:55 2007 UTC vs.
Revision 1.106 by root, Tue Jan 19 01:36:34 2010 UTC

1#include "EXTERN.h" 1#include "EXTERN.h"
2#include "perl.h" 2#include "perl.h"
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>
9#include <limits.h>
10#include <float.h>
8 11
12#if defined(__BORLANDC__) || defined(_MSC_VER)
13# define snprintf _snprintf // C compilers have this in stdio.h
14#endif
15
16// some old perls do not have this, try to make it work, no
17// guarantees, though. if it breaks, you get to keep the pieces.
18#ifndef UTF8_MAXBYTES
19# define UTF8_MAXBYTES 13
20#endif
21
22// three extra for rounding, sign, and end of string
23#define IVUV_MAXCHARS (sizeof (UV) * CHAR_BIT * 28 / 93 + 3)
24
9#define F_ASCII 0x00000001 25#define F_ASCII 0x00000001UL
26#define F_LATIN1 0x00000002UL
10#define F_UTF8 0x00000002 27#define F_UTF8 0x00000004UL
11#define F_INDENT 0x00000004 28#define F_INDENT 0x00000008UL
12#define F_CANONICAL 0x00000008 29#define F_CANONICAL 0x00000010UL
13#define F_SPACE_BEFORE 0x00000010 30#define F_SPACE_BEFORE 0x00000020UL
14#define F_SPACE_AFTER 0x00000020 31#define F_SPACE_AFTER 0x00000040UL
15#define F_JSON_RPC 0x00000040
16#define F_ALLOW_NONREF 0x00000080 32#define F_ALLOW_NONREF 0x00000100UL
17#define F_SHRINK 0x00000100 33#define F_SHRINK 0x00000200UL
34#define F_ALLOW_BLESSED 0x00000400UL
35#define F_CONV_BLESSED 0x00000800UL
36#define F_RELAXED 0x00001000UL
37#define F_ALLOW_UNKNOWN 0x00002000UL
38#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
18 39
19#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER 40#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
20#define F_DEFAULT 0
21 41
22#define INIT_SIZE 32 // initial scalar size to be allocated 42#define INIT_SIZE 32 // initial scalar size to be allocated
43#define INDENT_STEP 3 // spaces per indentation level
44
45#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
23 46
24#define SB do { 47#define SB do {
25#define SE } while (0) 48#define SE } while (0)
26 49
27static HV *json_stash; 50#if __GNUC__ >= 3
51# define expect(expr,value) __builtin_expect ((expr), (value))
52# define INLINE static inline
53#else
54# define expect(expr,value) (expr)
55# define INLINE static
56#endif
57
58#define expect_false(expr) expect ((expr) != 0, 0)
59#define expect_true(expr) expect ((expr) != 0, 1)
60
61#define IN_RANGE_INC(type,val,beg,end) \
62 ((unsigned type)((unsigned type)(val) - (unsigned type)(beg)) \
63 <= (unsigned type)((unsigned type)(end) - (unsigned type)(beg)))
64
65#define ERR_NESTING_EXCEEDED "json text or perl structure exceeds maximum nesting level (max_depth set too low?)"
66
67#ifdef USE_ITHREADS
68# define JSON_SLOW 1
69# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
70#else
71# define JSON_SLOW 0
72# define JSON_STASH json_stash
73#endif
74
75static HV *json_stash, *json_boolean_stash; // JSON::XS::
76static SV *json_true, *json_false;
77
78enum {
79 INCR_M_WS = 0, // initial whitespace skipping, must be 0
80 INCR_M_STR, // inside string
81 INCR_M_BS, // inside backslash
82 INCR_M_C0, // inside comment in initial whitespace sequence
83 INCR_M_C1, // inside comment in other places
84 INCR_M_JSON // outside anything, count nesting
85};
86
87#define INCR_DONE(json) ((json)->incr_nest <= 0 && (json)->incr_mode == INCR_M_JSON)
88
89typedef struct {
90 U32 flags;
91 U32 max_depth;
92 STRLEN max_size;
93
94 SV *cb_object;
95 HV *cb_sk_object;
96
97 // for the incremental parser
98 SV *incr_text; // the source text so far
99 STRLEN incr_pos; // the current offset into the text
100 int incr_nest; // {[]}-nesting level
101 unsigned char incr_mode;
102} JSON;
103
104INLINE void
105json_init (JSON *json)
106{
107 Zero (json, 1, JSON);
108 json->max_depth = 512;
109}
110
111/////////////////////////////////////////////////////////////////////////////
112// utility functions
113
114INLINE SV *
115get_bool (const char *name)
116{
117 SV *sv = get_sv (name, 1);
118
119 SvREADONLY_on (sv);
120 SvREADONLY_on (SvRV (sv));
121
122 return sv;
123}
124
125INLINE void
126shrink (SV *sv)
127{
128 sv_utf8_downgrade (sv, 1);
129
130 if (SvLEN (sv) > SvCUR (sv) + 1)
131 {
132#ifdef SvPV_shrink_to_cur
133 SvPV_shrink_to_cur (sv);
134#elif defined (SvPV_renew)
135 SvPV_renew (sv, SvCUR (sv) + 1);
136#endif
137 }
138}
139
140// decode an utf-8 character and return it, or (UV)-1 in
141// case of an error.
142// we special-case "safe" characters from U+80 .. U+7FF,
143// but use the very good perl function to parse anything else.
144// note that we never call this function for a ascii codepoints
145INLINE UV
146decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
147{
148 if (expect_true (len >= 2
149 && IN_RANGE_INC (char, s[0], 0xc2, 0xdf)
150 && IN_RANGE_INC (char, s[1], 0x80, 0xbf)))
151 {
152 *clen = 2;
153 return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
154 }
155 else
156 return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
157}
158
159// likewise for encoding, also never called for ascii codepoints
160// this function takes advantage of this fact, although current gccs
161// seem to optimise the check for >= 0x80 away anyways
162INLINE unsigned char *
163encode_utf8 (unsigned char *s, UV ch)
164{
165 if (expect_false (ch < 0x000080))
166 *s++ = ch;
167 else if (expect_true (ch < 0x000800))
168 *s++ = 0xc0 | ( ch >> 6),
169 *s++ = 0x80 | ( ch & 0x3f);
170 else if ( ch < 0x010000)
171 *s++ = 0xe0 | ( ch >> 12),
172 *s++ = 0x80 | ((ch >> 6) & 0x3f),
173 *s++ = 0x80 | ( ch & 0x3f);
174 else if ( ch < 0x110000)
175 *s++ = 0xf0 | ( ch >> 18),
176 *s++ = 0x80 | ((ch >> 12) & 0x3f),
177 *s++ = 0x80 | ((ch >> 6) & 0x3f),
178 *s++ = 0x80 | ( ch & 0x3f);
179
180 return s;
181}
182
183// convert offset pointer to character index, sv must be string
184static STRLEN
185ptr_to_index (SV *sv, char *offset)
186{
187 return SvUTF8 (sv)
188 ? utf8_distance (offset, SvPVX (sv))
189 : offset - SvPVX (sv);
190}
191
192/////////////////////////////////////////////////////////////////////////////
193// fp hell
194
195// scan a group of digits, and a trailing exponent
196static void
197json_atof_scan1 (const char *s, NV *accum, int *expo, int postdp, int maxdepth)
198{
199 UV uaccum = 0;
200 int eaccum = 0;
201
202 // if we recurse too deep, skip all remaining digits
203 // to avoid a stack overflow attack
204 if (expect_false (--maxdepth <= 0))
205 while (((U8)*s - '0') < 10)
206 ++s;
207
208 for (;;)
209 {
210 U8 dig = (U8)*s - '0';
211
212 if (expect_false (dig >= 10))
213 {
214 if (dig == (U8)((U8)'.' - (U8)'0'))
215 {
216 ++s;
217 json_atof_scan1 (s, accum, expo, 1, maxdepth);
218 }
219 else if ((dig | ' ') == 'e' - '0')
220 {
221 int exp2 = 0;
222 int neg = 0;
223
224 ++s;
225
226 if (*s == '-')
227 {
228 ++s;
229 neg = 1;
230 }
231 else if (*s == '+')
232 ++s;
233
234 while ((dig = (U8)*s - '0') < 10)
235 exp2 = exp2 * 10 + *s++ - '0';
236
237 *expo += neg ? -exp2 : exp2;
238 }
239
240 break;
241 }
242
243 ++s;
244
245 uaccum = uaccum * 10 + dig;
246 ++eaccum;
247
248 // if we have too many digits, then recurse for more
249 // we actually do this for rather few digits
250 if (uaccum >= (UV_MAX - 9) / 10)
251 {
252 if (postdp) *expo -= eaccum;
253 json_atof_scan1 (s, accum, expo, postdp, maxdepth);
254 if (postdp) *expo += eaccum;
255
256 break;
257 }
258 }
259
260 // this relies greatly on the quality of the pow ()
261 // implementation of the platform, but a good
262 // implementation is hard to beat.
263 if (postdp) *expo -= eaccum;
264 *accum += uaccum * Perl_pow (10., *expo);
265 *expo += eaccum;
266}
267
268static NV
269json_atof (const char *s)
270{
271 NV accum = 0.;
272 int expo = 0;
273 int neg = 0;
274
275 if (*s == '-')
276 {
277 ++s;
278 neg = 1;
279 }
280
281 // a recursion depth of ten gives us >>500 bits
282 json_atof_scan1 (s, &accum, &expo, 0, 10);
283
284 return neg ? -accum : accum;
285}
286/////////////////////////////////////////////////////////////////////////////
287// encoder
28 288
29// structure used for encoding JSON 289// structure used for encoding JSON
30typedef struct 290typedef struct
31{ 291{
32 char *cur; 292 char *cur; // SvPVX (sv) + current output position
33 STRLEN len; // SvLEN (sv)
34 char *end; // SvEND (sv) 293 char *end; // SvEND (sv)
35 SV *sv; 294 SV *sv; // result scalar
36 UV flags; 295 JSON json;
37 int max_recurse; 296 U32 indent; // indentation level
38 int indent; 297 UV limit; // escape character values >= this value when encoding
39} enc_t; 298} enc_t;
40 299
41// structure used for decoding JSON 300INLINE void
42typedef struct
43{
44 char *cur;
45 char *end;
46 const char *err;
47 UV flags;
48} dec_t;
49
50static UV *
51SvJSON (SV *sv)
52{
53 if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
54 croak ("object is not of type JSON::XS");
55
56 return &SvUVX (SvRV (sv));
57}
58
59/////////////////////////////////////////////////////////////////////////////
60
61static void
62need (enc_t *enc, STRLEN len) 301need (enc_t *enc, STRLEN len)
63{ 302{
64 if (enc->cur + len >= enc->end) 303 if (expect_false (enc->cur + len >= enc->end))
65 { 304 {
66 STRLEN cur = enc->cur - SvPVX (enc->sv); 305 STRLEN cur = enc->cur - (char *)SvPVX (enc->sv);
67 SvGROW (enc->sv, cur + len + 1); 306 SvGROW (enc->sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
68 enc->cur = SvPVX (enc->sv) + cur; 307 enc->cur = SvPVX (enc->sv) + cur;
69 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv); 308 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
70 } 309 }
71} 310}
72 311
73static void 312INLINE void
74encode_ch (enc_t *enc, char ch) 313encode_ch (enc_t *enc, char ch)
75{ 314{
76 need (enc, 1); 315 need (enc, 1);
77 *enc->cur++ = ch; 316 *enc->cur++ = ch;
78} 317}
… …
86 325
87 while (str < end) 326 while (str < end)
88 { 327 {
89 unsigned char ch = *(unsigned char *)str; 328 unsigned char ch = *(unsigned char *)str;
90 329
91 if (ch >= 0x20 && ch < 0x80) // most common case 330 if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
92 { 331 {
93 if (ch == '"') // but with slow exceptions 332 if (expect_false (ch == '"')) // but with slow exceptions
94 { 333 {
95 need (enc, len += 1); 334 need (enc, len += 1);
96 *enc->cur++ = '\\'; 335 *enc->cur++ = '\\';
97 *enc->cur++ = '"'; 336 *enc->cur++ = '"';
98 } 337 }
99 else if (ch == '\\') 338 else if (expect_false (ch == '\\'))
100 { 339 {
101 need (enc, len += 1); 340 need (enc, len += 1);
102 *enc->cur++ = '\\'; 341 *enc->cur++ = '\\';
103 *enc->cur++ = '\\'; 342 *enc->cur++ = '\\';
104 } 343 }
… …
122 STRLEN clen; 361 STRLEN clen;
123 UV uch; 362 UV uch;
124 363
125 if (is_utf8) 364 if (is_utf8)
126 { 365 {
127 uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY); 366 uch = decode_utf8 (str, end - str, &clen);
128 if (clen == (STRLEN)-1) 367 if (clen == (STRLEN)-1)
129 croak ("malformed UTF-8 character in string, cannot convert to JSON"); 368 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
130 } 369 }
131 else 370 else
132 { 371 {
133 uch = ch; 372 uch = ch;
134 clen = 1; 373 clen = 1;
135 } 374 }
136 375
137 if (uch < 0x80 || enc->flags & F_ASCII) 376 if (uch < 0x80/*0x20*/ || uch >= enc->limit)
138 { 377 {
139 if (uch > 0xFFFFUL) 378 if (uch >= 0x10000UL)
140 { 379 {
380 if (uch >= 0x110000UL)
381 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
382
141 need (enc, len += 11); 383 need (enc, len += 11);
142 sprintf (enc->cur, "\\u%04x\\u%04x", 384 sprintf (enc->cur, "\\u%04x\\u%04x",
143 (uch - 0x10000) / 0x400 + 0xD800, 385 (int)((uch - 0x10000) / 0x400 + 0xD800),
144 (uch - 0x10000) % 0x400 + 0xDC00); 386 (int)((uch - 0x10000) % 0x400 + 0xDC00));
145 enc->cur += 12; 387 enc->cur += 12;
146 } 388 }
147 else 389 else
148 { 390 {
149 static char hexdigit [16] = "0123456789abcdef";
150 need (enc, len += 5); 391 need (enc, len += 5);
151 *enc->cur++ = '\\'; 392 *enc->cur++ = '\\';
152 *enc->cur++ = 'u'; 393 *enc->cur++ = 'u';
153 *enc->cur++ = hexdigit [ uch >> 12 ]; 394 *enc->cur++ = PL_hexdigit [ uch >> 12 ];
154 *enc->cur++ = hexdigit [(uch >> 8) & 15]; 395 *enc->cur++ = PL_hexdigit [(uch >> 8) & 15];
155 *enc->cur++ = hexdigit [(uch >> 4) & 15]; 396 *enc->cur++ = PL_hexdigit [(uch >> 4) & 15];
156 *enc->cur++ = hexdigit [(uch >> 0) & 15]; 397 *enc->cur++ = PL_hexdigit [(uch >> 0) & 15];
157 } 398 }
158 399
400 str += clen;
401 }
402 else if (enc->json.flags & F_LATIN1)
403 {
404 *enc->cur++ = uch;
159 str += clen; 405 str += clen;
160 } 406 }
161 else if (is_utf8) 407 else if (is_utf8)
162 { 408 {
163 need (enc, len += clen); 409 need (enc, len += clen);
… …
167 } 413 }
168 while (--clen); 414 while (--clen);
169 } 415 }
170 else 416 else
171 { 417 {
172 need (enc, 10); // never more than 11 bytes needed 418 need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
173 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0); 419 enc->cur = encode_utf8 (enc->cur, uch);
174 ++str; 420 ++str;
175 } 421 }
176 } 422 }
177 } 423 }
178 } 424 }
179 425
180 --len; 426 --len;
181 } 427 }
182} 428}
183 429
184#define INDENT SB \ 430INLINE void
431encode_indent (enc_t *enc)
432{
185 if (enc->flags & F_INDENT) \ 433 if (enc->json.flags & F_INDENT)
186 { \ 434 {
187 int i_; \ 435 int spaces = enc->indent * INDENT_STEP;
188 need (enc, enc->indent); \ 436
189 for (i_ = enc->indent * 3; i_--; )\ 437 need (enc, spaces);
438 memset (enc->cur, ' ', spaces);
439 enc->cur += spaces;
440 }
441}
442
443INLINE void
444encode_space (enc_t *enc)
445{
446 need (enc, 1);
447 encode_ch (enc, ' ');
448}
449
450INLINE void
451encode_nl (enc_t *enc)
452{
453 if (enc->json.flags & F_INDENT)
454 {
455 need (enc, 1);
190 encode_ch (enc, ' '); \ 456 encode_ch (enc, '\n');
191 } \ 457 }
192 SE 458}
193 459
194#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE 460INLINE void
195#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE 461encode_comma (enc_t *enc)
196#define COMMA SB \ 462{
197 encode_ch (enc, ','); \ 463 encode_ch (enc, ',');
464
198 if (enc->flags & F_INDENT) \ 465 if (enc->json.flags & F_INDENT)
199 NL; \ 466 encode_nl (enc);
200 else if (enc->flags & F_SPACE_AFTER) \ 467 else if (enc->json.flags & F_SPACE_AFTER)
201 SPACE; \ 468 encode_space (enc);
202 SE 469}
203 470
204static void encode_sv (enc_t *enc, SV *sv); 471static void encode_sv (enc_t *enc, SV *sv);
205 472
206static void 473static void
207encode_av (enc_t *enc, AV *av) 474encode_av (enc_t *enc, AV *av)
208{ 475{
209 int i, len = av_len (av); 476 int i, len = av_len (av);
210 477
478 if (enc->indent >= enc->json.max_depth)
479 croak (ERR_NESTING_EXCEEDED);
480
211 encode_ch (enc, '['); NL; 481 encode_ch (enc, '[');
212 ++enc->indent; 482
483 if (len >= 0)
484 {
485 encode_nl (enc); ++enc->indent;
213 486
214 for (i = 0; i <= len; ++i) 487 for (i = 0; i <= len; ++i)
215 { 488 {
216 INDENT; 489 SV **svp = av_fetch (av, i, 0);
217 encode_sv (enc, *av_fetch (av, i, 0));
218 490
491 encode_indent (enc);
492
493 if (svp)
494 encode_sv (enc, *svp);
495 else
496 encode_str (enc, "null", 4, 0);
497
219 if (i < len) 498 if (i < len)
220 COMMA; 499 encode_comma (enc);
221 } 500 }
222 501
223 NL; 502 encode_nl (enc); --enc->indent; encode_indent (enc);
224 503 }
225 --enc->indent; 504
226 INDENT; encode_ch (enc, ']'); 505 encode_ch (enc, ']');
227} 506}
228 507
229static void 508static void
230encode_he (enc_t *enc, HE *he) 509encode_hk (enc_t *enc, HE *he)
231{ 510{
232 encode_ch (enc, '"'); 511 encode_ch (enc, '"');
233 512
234 if (HeKLEN (he) == HEf_SVKEY) 513 if (HeKLEN (he) == HEf_SVKEY)
235 { 514 {
… …
245 else 524 else
246 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he)); 525 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
247 526
248 encode_ch (enc, '"'); 527 encode_ch (enc, '"');
249 528
250 if (enc->flags & F_SPACE_BEFORE) SPACE; 529 if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
251 encode_ch (enc, ':'); 530 encode_ch (enc, ':');
252 if (enc->flags & F_SPACE_AFTER ) SPACE; 531 if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
253 encode_sv (enc, HeVAL (he));
254} 532}
255 533
256// compare hash entries, used when all keys are bytestrings 534// compare hash entries, used when all keys are bytestrings
257static int 535static int
258he_cmp_fast (const void *a_, const void *b_) 536he_cmp_fast (const void *a_, const void *b_)
… …
263 HE *b = *(HE **)b_; 541 HE *b = *(HE **)b_;
264 542
265 STRLEN la = HeKLEN (a); 543 STRLEN la = HeKLEN (a);
266 STRLEN lb = HeKLEN (b); 544 STRLEN lb = HeKLEN (b);
267 545
268 if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb))) 546 if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
269 cmp = la < lb ? -1 : la == lb ? 0 : 1; 547 cmp = lb - la;
270 548
271 return cmp; 549 return cmp;
272} 550}
273 551
274// compare hash entries, used when some keys are sv's or utf-x 552// compare hash entries, used when some keys are sv's or utf-x
275static int 553static int
276he_cmp_slow (const void *a, const void *b) 554he_cmp_slow (const void *a, const void *b)
277{ 555{
278 return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b)); 556 return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
279} 557}
280 558
281static void 559static void
282encode_hv (enc_t *enc, HV *hv) 560encode_hv (enc_t *enc, HV *hv)
283{ 561{
284 int count, i; 562 HE *he;
285 563
286 encode_ch (enc, '{'); NL; ++enc->indent; 564 if (enc->indent >= enc->json.max_depth)
565 croak (ERR_NESTING_EXCEEDED);
287 566
288 if ((count = hv_iterinit (hv))) 567 encode_ch (enc, '{');
289 { 568
290 // for canonical output we have to sort by keys first 569 // for canonical output we have to sort by keys first
291 // actually, this is mostly due to the stupid so-called 570 // actually, this is mostly due to the stupid so-called
292 // security workaround added somewhere in 5.8.x. 571 // security workaround added somewhere in 5.8.x
293 // that randomises hash orderings 572 // that randomises hash orderings
294 if (enc->flags & F_CANONICAL) 573 if (enc->json.flags & F_CANONICAL && !SvRMAGICAL (hv))
574 {
575 int count = hv_iterinit (hv);
576
577 if (SvMAGICAL (hv))
295 { 578 {
296 HE *he, *hes [count]; 579 // need to count by iterating. could improve by dynamically building the vector below
580 // but I don't care for the speed of this special case.
581 // note also that we will run into undefined behaviour when the two iterations
582 // do not result in the same count, something I might care for in some later release.
583
584 count = 0;
585 while (hv_iternext (hv))
586 ++count;
587
588 hv_iterinit (hv);
589 }
590
591 if (count)
592 {
297 int fast = 1; 593 int i, fast = 1;
594#if defined(__BORLANDC__) || defined(_MSC_VER)
595 HE **hes = _alloca (count * sizeof (HE));
596#else
597 HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
598#endif
298 599
299 i = 0; 600 i = 0;
300 while ((he = hv_iternext (hv))) 601 while ((he = hv_iternext (hv)))
301 { 602 {
302 hes [i++] = he; 603 hes [i++] = he;
… …
308 609
309 if (fast) 610 if (fast)
310 qsort (hes, count, sizeof (HE *), he_cmp_fast); 611 qsort (hes, count, sizeof (HE *), he_cmp_fast);
311 else 612 else
312 { 613 {
313 // hack to disable "use bytes" 614 // hack to forcefully disable "use bytes"
314 COP *oldcop = PL_curcop, cop; 615 COP cop = *PL_curcop;
315 cop.op_private = 0; 616 cop.op_private = 0;
617
618 ENTER;
619 SAVETMPS;
620
621 SAVEVPTR (PL_curcop);
316 PL_curcop = &cop; 622 PL_curcop = &cop;
317 623
318 SAVETMPS;
319 qsort (hes, count, sizeof (HE *), he_cmp_slow); 624 qsort (hes, count, sizeof (HE *), he_cmp_slow);
625
320 FREETMPS; 626 FREETMPS;
321 627 LEAVE;
322 PL_curcop = oldcop;
323 } 628 }
324 629
325 for (i = 0; i < count; ++i) 630 encode_nl (enc); ++enc->indent;
631
632 while (count--)
326 { 633 {
327 INDENT; 634 encode_indent (enc);
635 he = hes [count];
328 encode_he (enc, hes [i]); 636 encode_hk (enc, he);
637 encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
329 638
330 if (i < count - 1) 639 if (count)
331 COMMA; 640 encode_comma (enc);
332 } 641 }
333 642
643 encode_nl (enc); --enc->indent; encode_indent (enc);
644 }
645 }
646 else
647 {
648 if (hv_iterinit (hv) || SvMAGICAL (hv))
649 if ((he = hv_iternext (hv)))
334 NL; 650 {
651 encode_nl (enc); ++enc->indent;
652
653 for (;;)
654 {
655 encode_indent (enc);
656 encode_hk (enc, he);
657 encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
658
659 if (!(he = hv_iternext (hv)))
660 break;
661
662 encode_comma (enc);
663 }
664
665 encode_nl (enc); --enc->indent; encode_indent (enc);
666 }
667 }
668
669 encode_ch (enc, '}');
670}
671
672// encode objects, arrays and special \0=false and \1=true values.
673static void
674encode_rv (enc_t *enc, SV *sv)
675{
676 svtype svt;
677
678 SvGETMAGIC (sv);
679 svt = SvTYPE (sv);
680
681 if (expect_false (SvOBJECT (sv)))
682 {
683 HV *stash = !JSON_SLOW || json_boolean_stash
684 ? json_boolean_stash
685 : gv_stashpv ("JSON::XS::Boolean", 1);
686
687 if (SvSTASH (sv) == stash)
688 {
689 if (SvIV (sv))
690 encode_str (enc, "true", 4, 0);
691 else
692 encode_str (enc, "false", 5, 0);
335 } 693 }
336 else 694 else
337 { 695 {
338 SV *sv; 696#if 0
339 HE *he = hv_iternext (hv); 697 if (0 && sv_derived_from (rv, "JSON::Literal"))
340
341 for (;;)
342 { 698 {
343 INDENT; 699 // not yet
344 encode_he (enc, he);
345
346 if (!(he = hv_iternext (hv)))
347 break;
348
349 COMMA;
350 } 700 }
351 701#endif
702 if (enc->json.flags & F_CONV_BLESSED)
352 NL; 703 {
704 // we re-bless the reference to get overload and other niceties right
705 GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
706
707 if (to_json)
708 {
709 dSP;
710
711 ENTER; SAVETMPS; PUSHMARK (SP);
712 XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
713
714 // calling with G_SCALAR ensures that we always get a 1 return value
715 PUTBACK;
716 call_sv ((SV *)GvCV (to_json), G_SCALAR);
717 SPAGAIN;
718
719 // catch this surprisingly common error
720 if (SvROK (TOPs) && SvRV (TOPs) == sv)
721 croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
722
723 sv = POPs;
724 PUTBACK;
725
726 encode_sv (enc, sv);
727
728 FREETMPS; LEAVE;
729 }
730 else if (enc->json.flags & F_ALLOW_BLESSED)
731 encode_str (enc, "null", 4, 0);
732 else
733 croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
734 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
735 }
736 else if (enc->json.flags & F_ALLOW_BLESSED)
737 encode_str (enc, "null", 4, 0);
738 else
739 croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
740 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
353 } 741 }
354 } 742 }
743 else if (svt == SVt_PVHV)
744 encode_hv (enc, (HV *)sv);
745 else if (svt == SVt_PVAV)
746 encode_av (enc, (AV *)sv);
747 else if (svt < SVt_PVAV)
748 {
749 STRLEN len = 0;
750 char *pv = svt ? SvPV (sv, len) : 0;
355 751
356 --enc->indent; INDENT; encode_ch (enc, '}'); 752 if (len == 1 && *pv == '1')
753 encode_str (enc, "true", 4, 0);
754 else if (len == 1 && *pv == '0')
755 encode_str (enc, "false", 5, 0);
756 else if (enc->json.flags & F_ALLOW_UNKNOWN)
757 encode_str (enc, "null", 4, 0);
758 else
759 croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
760 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
761 }
762 else if (enc->json.flags & F_ALLOW_UNKNOWN)
763 encode_str (enc, "null", 4, 0);
764 else
765 croak ("encountered %s, but JSON can only represent references to arrays or hashes",
766 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
357} 767}
358 768
359static void 769static void
360encode_sv (enc_t *enc, SV *sv) 770encode_sv (enc_t *enc, SV *sv)
361{ 771{
… …
369 encode_str (enc, str, len, SvUTF8 (sv)); 779 encode_str (enc, str, len, SvUTF8 (sv));
370 encode_ch (enc, '"'); 780 encode_ch (enc, '"');
371 } 781 }
372 else if (SvNOKp (sv)) 782 else if (SvNOKp (sv))
373 { 783 {
784 // trust that perl will do the right thing w.r.t. JSON syntax.
374 need (enc, NV_DIG + 32); 785 need (enc, NV_DIG + 32);
375 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 786 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
376 enc->cur += strlen (enc->cur); 787 enc->cur += strlen (enc->cur);
377 } 788 }
378 else if (SvIOKp (sv)) 789 else if (SvIOKp (sv))
379 { 790 {
791 // we assume we can always read an IV as a UV and vice versa
792 // we assume two's complement
793 // we assume no aliasing issues in the union
794 if (SvIsUV (sv) ? SvUVX (sv) <= 59000
795 : SvIVX (sv) <= 59000 && SvIVX (sv) >= -59000)
796 {
797 // optimise the "small number case"
798 // code will likely be branchless and use only a single multiplication
799 // works for numbers up to 59074
800 I32 i = SvIVX (sv);
801 U32 u;
802 char digit, nz = 0;
803
380 need (enc, 64); 804 need (enc, 6);
805
806 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
807 u = i < 0 ? -i : i;
808
809 // convert to 4.28 fixed-point representation
810 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
811
812 // now output digit by digit, each time masking out the integer part
813 // and multiplying by 5 while moving the decimal point one to the right,
814 // resulting in a net multiplication by 10.
815 // we always write the digit to memory but conditionally increment
816 // the pointer, to enable the use of conditional move instructions.
817 digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffffUL) * 5;
818 digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffffUL) * 5;
819 digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffffUL) * 5;
820 digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffffUL) * 5;
821 digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
822 }
823 else
824 {
825 // large integer, use the (rather slow) snprintf way.
826 need (enc, IVUV_MAXCHARS);
381 enc->cur += 827 enc->cur +=
382 SvIsUV(sv) 828 SvIsUV(sv)
383 ? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv)) 829 ? snprintf (enc->cur, IVUV_MAXCHARS, "%"UVuf, (UV)SvUVX (sv))
384 : snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv)); 830 : snprintf (enc->cur, IVUV_MAXCHARS, "%"IVdf, (IV)SvIVX (sv));
831 }
385 } 832 }
386 else if (SvROK (sv)) 833 else if (SvROK (sv))
387 { 834 encode_rv (enc, SvRV (sv));
388 if (!--enc->max_recurse) 835 else if (!SvOK (sv) || enc->json.flags & F_ALLOW_UNKNOWN)
389 croak ("data structure too deep (hit recursion limit)");
390
391 sv = SvRV (sv);
392
393 switch (SvTYPE (sv))
394 {
395 case SVt_PVAV: encode_av (enc, (AV *)sv); break;
396 case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
397
398 default:
399 croak ("JSON can only represent references to arrays or hashes");
400 }
401 }
402 else if (!SvOK (sv))
403 encode_str (enc, "null", 4, 0); 836 encode_str (enc, "null", 4, 0);
404 else 837 else
405 croak ("encountered perl type that JSON cannot handle"); 838 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
839 SvPV_nolen (sv), SvFLAGS (sv));
406} 840}
407 841
408static SV * 842static SV *
409encode_json (SV *scalar, UV flags) 843encode_json (SV *scalar, JSON *json)
410{ 844{
411 if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))
412 croak ("hash- or arraref required (not a simple scalar, use allow_nonref to allow this)");
413
414 enc_t enc; 845 enc_t enc;
415 enc.flags = flags; 846
847 if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
848 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
849
850 enc.json = *json;
416 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE)); 851 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
417 enc.cur = SvPVX (enc.sv); 852 enc.cur = SvPVX (enc.sv);
418 enc.end = SvEND (enc.sv); 853 enc.end = SvEND (enc.sv);
419 enc.max_recurse = 0;
420 enc.indent = 0; 854 enc.indent = 0;
855 enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
856 : enc.json.flags & F_LATIN1 ? 0x000100UL
857 : 0x110000UL;
421 858
422 SvPOK_only (enc.sv); 859 SvPOK_only (enc.sv);
423 encode_sv (&enc, scalar); 860 encode_sv (&enc, scalar);
861 encode_nl (&enc);
424 862
863 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
864 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
865
425 if (!(flags & (F_ASCII | F_UTF8))) 866 if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
426 SvUTF8_on (enc.sv); 867 SvUTF8_on (enc.sv);
427 868
428 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
429
430#ifdef SvPV_shrink_to_cur
431 if (enc.flags & F_SHRINK) 869 if (enc.json.flags & F_SHRINK)
432 SvPV_shrink_to_cur (enc.sv); 870 shrink (enc.sv);
433#endif 871
434 return enc.sv; 872 return enc.sv;
435} 873}
436 874
437///////////////////////////////////////////////////////////////////////////// 875/////////////////////////////////////////////////////////////////////////////
876// decoder
438 877
439#define WS \ 878// structure used for decoding JSON
879typedef struct
880{
881 char *cur; // current parser pointer
882 char *end; // end of input string
883 const char *err; // parse error, if != 0
884 JSON json;
885 U32 depth; // recursion depth
886 U32 maxdepth; // recursion depth limit
887} dec_t;
888
889INLINE void
890decode_comment (dec_t *dec)
891{
892 // only '#'-style comments allowed a.t.m.
893
894 while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
895 ++dec->cur;
896}
897
898INLINE void
899decode_ws (dec_t *dec)
900{
440 for (;;) \ 901 for (;;)
441 { \ 902 {
442 char ch = *dec->cur; \ 903 char ch = *dec->cur;
904
443 if (ch > 0x20 \ 905 if (ch > 0x20)
906 {
907 if (expect_false (ch == '#'))
908 {
909 if (dec->json.flags & F_RELAXED)
910 decode_comment (dec);
911 else
912 break;
913 }
914 else
915 break;
916 }
444 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \ 917 else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
445 break; \ 918 break; // parse error, but let higher level handle it, gives better error messages
919
446 ++dec->cur; \ 920 ++dec->cur;
447 } 921 }
922}
448 923
449#define ERR(reason) SB dec->err = reason; goto fail; SE 924#define ERR(reason) SB dec->err = reason; goto fail; SE
925
450#define EXPECT_CH(ch) SB \ 926#define EXPECT_CH(ch) SB \
451 if (*dec->cur != ch) \ 927 if (*dec->cur != ch) \
452 ERR (# ch " expected"); \ 928 ERR (# ch " expected"); \
453 ++dec->cur; \ 929 ++dec->cur; \
454 SE 930 SE
455 931
932#define DEC_INC_DEPTH if (++dec->depth > dec->json.max_depth) ERR (ERR_NESTING_EXCEEDED)
933#define DEC_DEC_DEPTH --dec->depth
934
456static SV *decode_sv (dec_t *dec); 935static SV *decode_sv (dec_t *dec);
457 936
458static signed char decode_hexdigit[256]; 937static signed char decode_hexdigit[256];
459 938
460static UV 939static UV
461decode_4hex (dec_t *dec) 940decode_4hex (dec_t *dec)
462{ 941{
463 signed char d1, d2, d3, d4; 942 signed char d1, d2, d3, d4;
943 unsigned char *cur = (unsigned char *)dec->cur;
464 944
465 d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]]; 945 d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
466 if (d1 < 0) ERR ("four hexadecimal digits expected"); 946 d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
467 d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]]; 947 d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
468 if (d2 < 0) ERR ("four hexadecimal digits expected"); 948 d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
469 d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
470 if (d3 < 0) ERR ("four hexadecimal digits expected");
471 d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
472 if (d4 < 0) ERR ("four hexadecimal digits expected");
473 949
474 dec->cur += 4; 950 dec->cur += 4;
475 951
476 return ((UV)d1) << 12 952 return ((UV)d1) << 12
477 | ((UV)d2) << 8 953 | ((UV)d2) << 8
… …
480 956
481fail: 957fail:
482 return (UV)-1; 958 return (UV)-1;
483} 959}
484 960
485#define APPEND_GROW(n) SB \
486 if (cur + (n) >= end) \
487 { \
488 STRLEN ofs = cur - SvPVX (sv); \
489 SvGROW (sv, ofs + (n) + 1); \
490 cur = SvPVX (sv) + ofs; \
491 end = SvEND (sv); \
492 } \
493 SE
494
495#define APPEND_CH(ch) SB \
496 APPEND_GROW (1); \
497 *cur++ = (ch); \
498 SE
499
500static SV * 961static SV *
501decode_str (dec_t *dec) 962decode_str (dec_t *dec)
502{ 963{
503 SV *sv = NEWSV (0,2); 964 SV *sv = 0;
504 int utf8 = 0; 965 int utf8 = 0;
505 char *cur = SvPVX (sv); 966 char *dec_cur = dec->cur;
506 char *end = SvEND (sv);
507 967
508 for (;;) 968 do
509 { 969 {
510 unsigned char ch = *(unsigned char *)dec->cur; 970 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
971 char *cur = buf;
511 972
512 if (ch == '"') 973 do
513 break;
514 else if (ch == '\\')
515 { 974 {
516 switch (*++dec->cur) 975 unsigned char ch = *(unsigned char *)dec_cur++;
976
977 if (expect_false (ch == '"'))
517 { 978 {
518 case '\\': 979 --dec_cur;
519 case '/': 980 break;
520 case '"': APPEND_CH (*dec->cur++); break; 981 }
521 982 else if (expect_false (ch == '\\'))
522 case 'b': APPEND_CH ('\010'); ++dec->cur; break; 983 {
523 case 't': APPEND_CH ('\011'); ++dec->cur; break; 984 switch (*dec_cur)
524 case 'n': APPEND_CH ('\012'); ++dec->cur; break;
525 case 'f': APPEND_CH ('\014'); ++dec->cur; break;
526 case 'r': APPEND_CH ('\015'); ++dec->cur; break;
527
528 case 'u':
529 { 985 {
530 UV lo, hi; 986 case '\\':
531 ++dec->cur; 987 case '/':
988 case '"': *cur++ = *dec_cur++; break;
532 989
533 hi = decode_4hex (dec); 990 case 'b': ++dec_cur; *cur++ = '\010'; break;
534 if (hi == (UV)-1) 991 case 't': ++dec_cur; *cur++ = '\011'; break;
535 goto fail; 992 case 'n': ++dec_cur; *cur++ = '\012'; break;
993 case 'f': ++dec_cur; *cur++ = '\014'; break;
994 case 'r': ++dec_cur; *cur++ = '\015'; break;
536 995
537 // possibly a surrogate pair 996 case 'u':
538 if (hi >= 0xd800 && hi < 0xdc00)
539 { 997 {
540 if (dec->cur [0] != '\\' || dec->cur [1] != 'u') 998 UV lo, hi;
541 ERR ("missing low surrogate character in surrogate pair"); 999 ++dec_cur;
542 1000
543 dec->cur += 2; 1001 dec->cur = dec_cur;
544
545 lo = decode_4hex (dec); 1002 hi = decode_4hex (dec);
1003 dec_cur = dec->cur;
546 if (lo == (UV)-1) 1004 if (hi == (UV)-1)
547 goto fail; 1005 goto fail;
548 1006
1007 // possibly a surrogate pair
1008 if (hi >= 0xd800)
1009 if (hi < 0xdc00)
1010 {
1011 if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
1012 ERR ("missing low surrogate character in surrogate pair");
1013
1014 dec_cur += 2;
1015
1016 dec->cur = dec_cur;
1017 lo = decode_4hex (dec);
1018 dec_cur = dec->cur;
1019 if (lo == (UV)-1)
1020 goto fail;
1021
549 if (lo < 0xdc00 || lo >= 0xe000) 1022 if (lo < 0xdc00 || lo >= 0xe000)
550 ERR ("surrogate pair expected"); 1023 ERR ("surrogate pair expected");
551 1024
552 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; 1025 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
1026 }
1027 else if (hi < 0xe000)
1028 ERR ("missing high surrogate character in surrogate pair");
1029
1030 if (hi >= 0x80)
1031 {
1032 utf8 = 1;
1033
1034 cur = encode_utf8 (cur, hi);
1035 }
1036 else
1037 *cur++ = hi;
553 } 1038 }
554 else if (hi >= 0xdc00 && hi < 0xe000)
555 ERR ("missing high surrogate character in surrogate pair");
556
557 if (hi >= 0x80)
558 { 1039 break;
559 utf8 = 1;
560 1040
561 APPEND_GROW (4); // at most 4 bytes for 21 bits
562 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
563 }
564 else 1041 default:
565 APPEND_CH (hi); 1042 --dec_cur;
1043 ERR ("illegal backslash escape sequence in string");
566 } 1044 }
567 break; 1045 }
1046 else if (expect_true (ch >= 0x20 && ch < 0x80))
1047 *cur++ = ch;
1048 else if (ch >= 0x80)
1049 {
1050 STRLEN clen;
568 1051
569 default:
570 --dec->cur; 1052 --dec_cur;
571 ERR ("illegal backslash escape sequence in string"); 1053
1054 decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
1055 if (clen == (STRLEN)-1)
1056 ERR ("malformed UTF-8 character in JSON string");
1057
1058 do
1059 *cur++ = *dec_cur++;
1060 while (--clen);
1061
1062 utf8 = 1;
1063 }
1064 else
1065 {
1066 --dec_cur;
1067
1068 if (!ch)
1069 ERR ("unexpected end of string while parsing JSON string");
1070 else
1071 ERR ("invalid character encountered while parsing JSON string");
572 } 1072 }
573 } 1073 }
574 else if (ch >= 0x20 && ch <= 0x7f) 1074 while (cur < buf + SHORT_STRING_LEN);
575 APPEND_CH (*dec->cur++); 1075
576 else if (ch >= 0x80)
577 { 1076 {
578 STRLEN clen; 1077 STRLEN len = cur - buf;
579 UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
580 if (clen == (STRLEN)-1)
581 ERR ("malformed UTF-8 character in string, cannot convert to JSON");
582 1078
583 APPEND_GROW (clen); 1079 if (sv)
584 do
585 { 1080 {
586 *cur++ = *dec->cur++; 1081 STRLEN cur = SvCUR (sv);
1082
1083 if (SvLEN (sv) <= cur + len)
1084 SvGROW (sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
1085
1086 memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
1087 SvCUR_set (sv, SvCUR (sv) + len);
587 } 1088 }
588 while (--clen);
589
590 utf8 = 1;
591 }
592 else if (dec->cur == dec->end)
593 ERR ("unexpected end of string while parsing json string");
594 else 1089 else
595 ERR ("invalid character encountered"); 1090 sv = newSVpvn (buf, len);
596 } 1091 }
1092 }
1093 while (*dec_cur != '"');
597 1094
598 ++dec->cur; 1095 ++dec_cur;
599 1096
600 SvCUR_set (sv, cur - SvPVX (sv)); 1097 if (sv)
601 1098 {
602 SvPOK_only (sv); 1099 SvPOK_only (sv);
603 *SvEND (sv) = 0; 1100 *SvEND (sv) = 0;
604 1101
605 if (utf8) 1102 if (utf8)
606 SvUTF8_on (sv); 1103 SvUTF8_on (sv);
1104 }
1105 else
1106 sv = newSVpvn ("", 0);
607 1107
608#ifdef SvPV_shrink_to_cur 1108 dec->cur = dec_cur;
609 if (dec->flags & F_SHRINK)
610 SvPV_shrink_to_cur (sv);
611#endif
612
613 return sv; 1109 return sv;
614 1110
615fail: 1111fail:
616 SvREFCNT_dec (sv); 1112 dec->cur = dec_cur;
617 return 0; 1113 return 0;
618} 1114}
619 1115
620static SV * 1116static SV *
621decode_num (dec_t *dec) 1117decode_num (dec_t *dec)
… …
679 is_nv = 1; 1175 is_nv = 1;
680 } 1176 }
681 1177
682 if (!is_nv) 1178 if (!is_nv)
683 { 1179 {
684 UV uv; 1180 int len = dec->cur - start;
685 int numtype = grok_number (start, dec->cur - start, &uv); 1181
686 if (numtype & IS_NUMBER_IN_UV) 1182 // special case the rather common 1..5-digit-int case
687 if (numtype & IS_NUMBER_NEG) 1183 if (*start == '-')
1184 switch (len)
688 { 1185 {
689 if (uv < (UV)IV_MIN) 1186 case 2: return newSViv (-(IV)( start [1] - '0' * 1));
690 return newSViv (-(IV)uv); 1187 case 3: return newSViv (-(IV)( start [1] * 10 + start [2] - '0' * 11));
1188 case 4: return newSViv (-(IV)( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
1189 case 5: return newSViv (-(IV)( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
1190 case 6: return newSViv (-(IV)(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
691 } 1191 }
1192 else
1193 switch (len)
1194 {
1195 case 1: return newSViv ( start [0] - '0' * 1);
1196 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
1197 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
1198 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
1199 case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
1200 }
1201
1202 {
1203 UV uv;
1204 int numtype = grok_number (start, len, &uv);
1205 if (numtype & IS_NUMBER_IN_UV)
1206 if (numtype & IS_NUMBER_NEG)
1207 {
1208 if (uv < (UV)IV_MIN)
1209 return newSViv (-(IV)uv);
1210 }
692 else 1211 else
693 return newSVuv (uv); 1212 return newSVuv (uv);
694 } 1213 }
695 1214
1215 len -= *start == '-' ? 1 : 0;
1216
1217 // does not fit into IV or UV, try NV
1218 if (len <= NV_DIG)
1219 // fits into NV without loss of precision
1220 return newSVnv (json_atof (start));
1221
1222 // everything else fails, convert it to a string
1223 return newSVpvn (start, dec->cur - start);
1224 }
1225
1226 // loss of precision here
696 return newSVnv (Atof (start)); 1227 return newSVnv (json_atof (start));
697 1228
698fail: 1229fail:
699 return 0; 1230 return 0;
700} 1231}
701 1232
702static SV * 1233static SV *
703decode_av (dec_t *dec) 1234decode_av (dec_t *dec)
704{ 1235{
705 AV *av = newAV (); 1236 AV *av = newAV ();
706 1237
707 WS; 1238 DEC_INC_DEPTH;
1239 decode_ws (dec);
1240
708 if (*dec->cur == ']') 1241 if (*dec->cur == ']')
709 ++dec->cur; 1242 ++dec->cur;
710 else 1243 else
711 for (;;) 1244 for (;;)
712 { 1245 {
… …
716 if (!value) 1249 if (!value)
717 goto fail; 1250 goto fail;
718 1251
719 av_push (av, value); 1252 av_push (av, value);
720 1253
721 WS; 1254 decode_ws (dec);
722 1255
723 if (*dec->cur == ']') 1256 if (*dec->cur == ']')
724 { 1257 {
725 ++dec->cur; 1258 ++dec->cur;
726 break; 1259 break;
… …
728 1261
729 if (*dec->cur != ',') 1262 if (*dec->cur != ',')
730 ERR (", or ] expected while parsing array"); 1263 ERR (", or ] expected while parsing array");
731 1264
732 ++dec->cur; 1265 ++dec->cur;
1266
1267 decode_ws (dec);
1268
1269 if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
1270 {
1271 ++dec->cur;
1272 break;
1273 }
733 } 1274 }
734 1275
1276 DEC_DEC_DEPTH;
735 return newRV_noinc ((SV *)av); 1277 return newRV_noinc ((SV *)av);
736 1278
737fail: 1279fail:
738 SvREFCNT_dec (av); 1280 SvREFCNT_dec (av);
1281 DEC_DEC_DEPTH;
739 return 0; 1282 return 0;
740} 1283}
741 1284
742static SV * 1285static SV *
743decode_hv (dec_t *dec) 1286decode_hv (dec_t *dec)
744{ 1287{
1288 SV *sv;
745 HV *hv = newHV (); 1289 HV *hv = newHV ();
746 1290
747 WS; 1291 DEC_INC_DEPTH;
1292 decode_ws (dec);
1293
748 if (*dec->cur == '}') 1294 if (*dec->cur == '}')
749 ++dec->cur; 1295 ++dec->cur;
750 else 1296 else
751 for (;;) 1297 for (;;)
752 { 1298 {
753 SV *key, *value;
754
755 WS; EXPECT_CH ('"'); 1299 EXPECT_CH ('"');
756 1300
757 key = decode_str (dec); 1301 // heuristic: assume that
758 if (!key) 1302 // a) decode_str + hv_store_ent are abysmally slow.
759 goto fail; 1303 // b) most hash keys are short, simple ascii text.
1304 // => try to "fast-match" such strings to avoid
1305 // the overhead of decode_str + hv_store_ent.
1306 {
1307 SV *value;
1308 char *p = dec->cur;
1309 char *e = p + 24; // only try up to 24 bytes
760 1310
761 WS; EXPECT_CH (':'); 1311 for (;;)
762
763 value = decode_sv (dec);
764 if (!value)
765 { 1312 {
1313 // the >= 0x80 is false on most architectures
1314 if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
1315 {
1316 // slow path, back up and use decode_str
1317 SV *key = decode_str (dec);
1318 if (!key)
1319 goto fail;
1320
1321 decode_ws (dec); EXPECT_CH (':');
1322
1323 decode_ws (dec);
1324 value = decode_sv (dec);
1325 if (!value)
1326 {
1327 SvREFCNT_dec (key);
1328 goto fail;
1329 }
1330
1331 hv_store_ent (hv, key, value, 0);
766 SvREFCNT_dec (key); 1332 SvREFCNT_dec (key);
1333
1334 break;
1335 }
1336 else if (*p == '"')
1337 {
1338 // fast path, got a simple key
1339 char *key = dec->cur;
1340 int len = p - key;
1341 dec->cur = p + 1;
1342
1343 decode_ws (dec); EXPECT_CH (':');
1344
1345 decode_ws (dec);
1346 value = decode_sv (dec);
1347 if (!value)
767 goto fail; 1348 goto fail;
1349
1350 hv_store (hv, key, len, value, 0);
1351
1352 break;
1353 }
1354
1355 ++p;
768 } 1356 }
769
770 //TODO: optimise
771 hv_store_ent (hv, key, value, 0);
772
773 WS; 1357 }
1358
1359 decode_ws (dec);
774 1360
775 if (*dec->cur == '}') 1361 if (*dec->cur == '}')
776 { 1362 {
777 ++dec->cur; 1363 ++dec->cur;
778 break; 1364 break;
… …
780 1366
781 if (*dec->cur != ',') 1367 if (*dec->cur != ',')
782 ERR (", or } expected while parsing object/hash"); 1368 ERR (", or } expected while parsing object/hash");
783 1369
784 ++dec->cur; 1370 ++dec->cur;
1371
1372 decode_ws (dec);
1373
1374 if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
1375 {
1376 ++dec->cur;
1377 break;
1378 }
785 } 1379 }
786 1380
1381 DEC_DEC_DEPTH;
787 return newRV_noinc ((SV *)hv); 1382 sv = newRV_noinc ((SV *)hv);
1383
1384 // check filter callbacks
1385 if (dec->json.flags & F_HOOK)
1386 {
1387 if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
1388 {
1389 HE *cb, *he;
1390
1391 hv_iterinit (hv);
1392 he = hv_iternext (hv);
1393 hv_iterinit (hv);
1394
1395 // the next line creates a mortal sv each time its called.
1396 // might want to optimise this for common cases.
1397 cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
1398
1399 if (cb)
1400 {
1401 dSP;
1402 int count;
1403
1404 ENTER; SAVETMPS; PUSHMARK (SP);
1405 XPUSHs (HeVAL (he));
1406
1407 PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
1408
1409 if (count == 1)
1410 {
1411 sv = newSVsv (POPs);
1412 FREETMPS; LEAVE;
1413 return sv;
1414 }
1415
1416 FREETMPS; LEAVE;
1417 }
1418 }
1419
1420 if (dec->json.cb_object)
1421 {
1422 dSP;
1423 int count;
1424
1425 ENTER; SAVETMPS; PUSHMARK (SP);
1426 XPUSHs (sv_2mortal (sv));
1427
1428 PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
1429
1430 if (count == 1)
1431 {
1432 sv = newSVsv (POPs);
1433 FREETMPS; LEAVE;
1434 return sv;
1435 }
1436
1437 SvREFCNT_inc (sv);
1438 FREETMPS; LEAVE;
1439 }
1440 }
1441
1442 return sv;
788 1443
789fail: 1444fail:
790 SvREFCNT_dec (hv); 1445 SvREFCNT_dec (hv);
1446 DEC_DEC_DEPTH;
791 return 0; 1447 return 0;
792} 1448}
793 1449
794static SV * 1450static SV *
795decode_sv (dec_t *dec) 1451decode_sv (dec_t *dec)
796{ 1452{
797 WS; 1453 // the beauty of JSON: you need exactly one character lookahead
1454 // to parse everything.
798 switch (*dec->cur) 1455 switch (*dec->cur)
799 { 1456 {
800 case '"': ++dec->cur; return decode_str (dec); 1457 case '"': ++dec->cur; return decode_str (dec);
801 case '[': ++dec->cur; return decode_av (dec); 1458 case '[': ++dec->cur; return decode_av (dec);
802 case '{': ++dec->cur; return decode_hv (dec); 1459 case '{': ++dec->cur; return decode_hv (dec);
803 1460
804 case '-': 1461 case '-':
805 case '0': case '1': case '2': case '3': case '4': 1462 case '0': case '1': case '2': case '3': case '4':
806 case '5': case '6': case '7': case '8': case '9': 1463 case '5': case '6': case '7': case '8': case '9':
807 return decode_num (dec); 1464 return decode_num (dec);
808 1465
809 case 't': 1466 case 't':
810 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4)) 1467 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
811 { 1468 {
812 dec->cur += 4; 1469 dec->cur += 4;
1470#if JSON_SLOW
1471 json_true = get_bool ("JSON::XS::true");
1472#endif
813 return newSViv (1); 1473 return newSVsv (json_true);
814 } 1474 }
815 else 1475 else
816 ERR ("'true' expected"); 1476 ERR ("'true' expected");
817 1477
818 break; 1478 break;
819 1479
820 case 'f': 1480 case 'f':
821 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5)) 1481 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
822 { 1482 {
823 dec->cur += 5; 1483 dec->cur += 5;
1484#if JSON_SLOW
1485 json_false = get_bool ("JSON::XS::false");
1486#endif
824 return newSViv (0); 1487 return newSVsv (json_false);
825 } 1488 }
826 else 1489 else
827 ERR ("'false' expected"); 1490 ERR ("'false' expected");
828 1491
829 break; 1492 break;
… …
838 ERR ("'null' expected"); 1501 ERR ("'null' expected");
839 1502
840 break; 1503 break;
841 1504
842 default: 1505 default:
843 ERR ("malformed json string"); 1506 ERR ("malformed JSON string, neither array, object, number, string or atom");
844 break; 1507 break;
845 } 1508 }
846 1509
847fail: 1510fail:
848 return 0; 1511 return 0;
849} 1512}
850 1513
851static SV * 1514static SV *
852decode_json (SV *string, UV flags) 1515decode_json (SV *string, JSON *json, char **offset_return)
853{ 1516{
1517 dec_t dec;
854 SV *sv; 1518 SV *sv;
855 1519
1520 /* work around bugs in 5.10 where manipulating magic values
1521 * will perl ignore the magic in subsequent accesses
1522 */
1523 /*SvGETMAGIC (string);*/
1524 if (SvMAGICAL (string))
1525 string = sv_2mortal (newSVsv (string));
1526
1527 SvUPGRADE (string, SVt_PV);
1528
1529 /* work around a bug in perl 5.10, which causes SvCUR to fail an
1530 * assertion with -DDEBUGGING, although SvCUR is documented to
1531 * return the xpv_cur field which certainly exists after upgrading.
1532 * according to nicholas clark, calling SvPOK fixes this.
1533 * But it doesn't fix it, so try another workaround, call SvPV_nolen
1534 * and hope for the best.
1535 * Damnit, SvPV_nolen still trips over yet another assertion. This
1536 * assertion business is seriously broken, try yet another workaround
1537 * for the broken -DDEBUGGING.
1538 */
1539 {
1540#ifdef DEBUGGING
1541 STRLEN offset = SvOK (string) ? sv_len (string) : 0;
1542#else
1543 STRLEN offset = SvCUR (string);
1544#endif
1545
1546 if (offset > json->max_size && json->max_size)
1547 croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
1548 (unsigned long)SvCUR (string), (unsigned long)json->max_size);
1549 }
1550
856 if (flags & F_UTF8) 1551 if (json->flags & F_UTF8)
857 sv_utf8_downgrade (string, 0); 1552 sv_utf8_downgrade (string, 0);
858 else 1553 else
859 sv_utf8_upgrade (string); 1554 sv_utf8_upgrade (string);
860 1555
861 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP 1556 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
862 1557
863 dec_t dec; 1558 dec.json = *json;
864 dec.flags = flags;
865 dec.cur = SvPVX (string); 1559 dec.cur = SvPVX (string);
866 dec.end = SvEND (string); 1560 dec.end = SvEND (string);
867 dec.err = 0; 1561 dec.err = 0;
1562 dec.depth = 0;
868 1563
1564 if (dec.json.cb_object || dec.json.cb_sk_object)
1565 dec.json.flags |= F_HOOK;
1566
1567 *dec.end = 0; // this should basically be a nop, too, but make sure it's there
1568
1569 decode_ws (&dec);
869 sv = decode_sv (&dec); 1570 sv = decode_sv (&dec);
870 1571
1572 if (offset_return)
1573 *offset_return = dec.cur;
1574
1575 if (!(offset_return || !sv))
1576 {
1577 // check for trailing garbage
1578 decode_ws (&dec);
1579
1580 if (*dec.cur)
1581 {
1582 dec.err = "garbage after JSON object";
1583 SvREFCNT_dec (sv);
1584 sv = 0;
1585 }
1586 }
1587
871 if (!sv) 1588 if (!sv)
872 { 1589 {
873 IV offset = utf8_distance (dec.cur, SvPVX (string));
874 SV *uni = sv_newmortal (); 1590 SV *uni = sv_newmortal ();
1591
875 // horrible hack to silence warning inside pv_uni_display 1592 // horrible hack to silence warning inside pv_uni_display
876 COP cop; 1593 COP cop = *PL_curcop;
877 memset (&cop, 0, sizeof (cop));
878 cop.cop_warnings = pWARN_NONE; 1594 cop.cop_warnings = pWARN_NONE;
1595 ENTER;
879 SAVEVPTR (PL_curcop); 1596 SAVEVPTR (PL_curcop);
880 PL_curcop = &cop; 1597 PL_curcop = &cop;
881
882 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ); 1598 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
1599 LEAVE;
1600
883 croak ("%s, at character offset %d (%s)", 1601 croak ("%s, at character offset %d (before \"%s\")",
884 dec.err, 1602 dec.err,
885 (int)offset, 1603 ptr_to_index (string, dec.cur),
886 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)"); 1604 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
887 } 1605 }
888 1606
889 sv = sv_2mortal (sv); 1607 sv = sv_2mortal (sv);
890 1608
891 if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv)) 1609 if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
892 croak ("JSON object or array expected (but number, string, true, false or null found, use allow_nonref to allow this)"); 1610 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
893 1611
894 return sv; 1612 return sv;
895} 1613}
896 1614
1615/////////////////////////////////////////////////////////////////////////////
1616// incremental parser
1617
1618static void
1619incr_parse (JSON *self)
1620{
1621 const char *p = SvPVX (self->incr_text) + self->incr_pos;
1622
1623 // the state machine here is a bit convoluted and could be simplified a lot
1624 // but this would make it slower, so...
1625
1626 for (;;)
1627 {
1628 //printf ("loop pod %d *p<%c><%s>, mode %d nest %d\n", p - SvPVX (self->incr_text), *p, p, self->incr_mode, self->incr_nest);//D
1629 switch (self->incr_mode)
1630 {
1631 // only used for initial whitespace skipping
1632 case INCR_M_WS:
1633 for (;;)
1634 {
1635 if (*p > 0x20)
1636 {
1637 if (*p == '#')
1638 {
1639 self->incr_mode = INCR_M_C0;
1640 goto incr_m_c;
1641 }
1642 else
1643 {
1644 self->incr_mode = INCR_M_JSON;
1645 goto incr_m_json;
1646 }
1647 }
1648 else if (!*p)
1649 goto interrupt;
1650
1651 ++p;
1652 }
1653
1654 // skip a single char inside a string (for \\-processing)
1655 case INCR_M_BS:
1656 if (!*p)
1657 goto interrupt;
1658
1659 ++p;
1660 self->incr_mode = INCR_M_STR;
1661 goto incr_m_str;
1662
1663 // inside #-style comments
1664 case INCR_M_C0:
1665 case INCR_M_C1:
1666 incr_m_c:
1667 for (;;)
1668 {
1669 if (*p == '\n')
1670 {
1671 self->incr_mode = self->incr_mode == INCR_M_C0 ? INCR_M_WS : INCR_M_JSON;
1672 break;
1673 }
1674 else if (!*p)
1675 goto interrupt;
1676
1677 ++p;
1678 }
1679
1680 break;
1681
1682 // inside a string
1683 case INCR_M_STR:
1684 incr_m_str:
1685 for (;;)
1686 {
1687 if (*p == '"')
1688 {
1689 ++p;
1690 self->incr_mode = INCR_M_JSON;
1691
1692 if (!self->incr_nest)
1693 goto interrupt;
1694
1695 goto incr_m_json;
1696 }
1697 else if (*p == '\\')
1698 {
1699 ++p; // "virtually" consumes character after \
1700
1701 if (!*p) // if at end of string we have to switch modes
1702 {
1703 self->incr_mode = INCR_M_BS;
1704 goto interrupt;
1705 }
1706 }
1707 else if (!*p)
1708 goto interrupt;
1709
1710 ++p;
1711 }
1712
1713 // after initial ws, outside string
1714 case INCR_M_JSON:
1715 incr_m_json:
1716 for (;;)
1717 {
1718 switch (*p++)
1719 {
1720 case 0:
1721 --p;
1722 goto interrupt;
1723
1724 case 0x09:
1725 case 0x0a:
1726 case 0x0d:
1727 case 0x20:
1728 if (!self->incr_nest)
1729 {
1730 --p; // do not eat the whitespace, let the next round do it
1731 goto interrupt;
1732 }
1733 break;
1734
1735 case '"':
1736 self->incr_mode = INCR_M_STR;
1737 goto incr_m_str;
1738
1739 case '[':
1740 case '{':
1741 if (++self->incr_nest > self->max_depth)
1742 croak (ERR_NESTING_EXCEEDED);
1743 break;
1744
1745 case ']':
1746 case '}':
1747 if (--self->incr_nest <= 0)
1748 goto interrupt;
1749 break;
1750
1751 case '#':
1752 self->incr_mode = INCR_M_C1;
1753 goto incr_m_c;
1754 }
1755 }
1756 }
1757
1758 modechange:
1759 ;
1760 }
1761
1762interrupt:
1763 self->incr_pos = p - SvPVX (self->incr_text);
1764 //printf ("interrupt<%.*s>\n", self->incr_pos, SvPVX(self->incr_text));//D
1765 //printf ("return pos %d mode %d nest %d\n", self->incr_pos, self->incr_mode, self->incr_nest);//D
1766}
1767
1768/////////////////////////////////////////////////////////////////////////////
1769// XS interface functions
1770
897MODULE = JSON::XS PACKAGE = JSON::XS 1771MODULE = JSON::XS PACKAGE = JSON::XS
898 1772
899BOOT: 1773BOOT:
900{ 1774{
901 int i; 1775 int i;
902 1776
903 memset (decode_hexdigit, 0xff, 256);
904 for (i = 10; i--; ) 1777 for (i = 0; i < 256; ++i)
905 decode_hexdigit ['0' + i] = i; 1778 decode_hexdigit [i] =
1779 i >= '0' && i <= '9' ? i - '0'
1780 : i >= 'a' && i <= 'f' ? i - 'a' + 10
1781 : i >= 'A' && i <= 'F' ? i - 'A' + 10
1782 : -1;
906 1783
907 for (i = 7; i--; )
908 {
909 decode_hexdigit ['a' + i] = 10 + i;
910 decode_hexdigit ['A' + i] = 10 + i;
911 }
912
913 json_stash = gv_stashpv ("JSON::XS", 1); 1784 json_stash = gv_stashpv ("JSON::XS" , 1);
1785 json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
1786
1787 json_true = get_bool ("JSON::XS::true");
1788 json_false = get_bool ("JSON::XS::false");
1789
1790 CvNODEBUG_on (get_cv ("JSON::XS::incr_text", 0)); /* the debugger completely breaks lvalue subs */
914} 1791}
915 1792
916PROTOTYPES: DISABLE 1793PROTOTYPES: DISABLE
917 1794
918SV *new (char *dummy) 1795void CLONE (...)
919 CODE: 1796 CODE:
920 RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash); 1797 json_stash = 0;
1798 json_boolean_stash = 0;
1799
1800void new (char *klass)
1801 PPCODE:
1802{
1803 SV *pv = NEWSV (0, sizeof (JSON));
1804 SvPOK_only (pv);
1805 json_init ((JSON *)SvPVX (pv));
1806 XPUSHs (sv_2mortal (sv_bless (
1807 newRV_noinc (pv),
1808 strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
1809 )));
1810}
1811
1812void ascii (JSON *self, int enable = 1)
1813 ALIAS:
1814 ascii = F_ASCII
1815 latin1 = F_LATIN1
1816 utf8 = F_UTF8
1817 indent = F_INDENT
1818 canonical = F_CANONICAL
1819 space_before = F_SPACE_BEFORE
1820 space_after = F_SPACE_AFTER
1821 pretty = F_PRETTY
1822 allow_nonref = F_ALLOW_NONREF
1823 shrink = F_SHRINK
1824 allow_blessed = F_ALLOW_BLESSED
1825 convert_blessed = F_CONV_BLESSED
1826 relaxed = F_RELAXED
1827 allow_unknown = F_ALLOW_UNKNOWN
1828 PPCODE:
1829{
1830 if (enable)
1831 self->flags |= ix;
1832 else
1833 self->flags &= ~ix;
1834
1835 XPUSHs (ST (0));
1836}
1837
1838void get_ascii (JSON *self)
1839 ALIAS:
1840 get_ascii = F_ASCII
1841 get_latin1 = F_LATIN1
1842 get_utf8 = F_UTF8
1843 get_indent = F_INDENT
1844 get_canonical = F_CANONICAL
1845 get_space_before = F_SPACE_BEFORE
1846 get_space_after = F_SPACE_AFTER
1847 get_allow_nonref = F_ALLOW_NONREF
1848 get_shrink = F_SHRINK
1849 get_allow_blessed = F_ALLOW_BLESSED
1850 get_convert_blessed = F_CONV_BLESSED
1851 get_relaxed = F_RELAXED
1852 get_allow_unknown = F_ALLOW_UNKNOWN
1853 PPCODE:
1854 XPUSHs (boolSV (self->flags & ix));
1855
1856void max_depth (JSON *self, U32 max_depth = 0x80000000UL)
1857 PPCODE:
1858 self->max_depth = max_depth;
1859 XPUSHs (ST (0));
1860
1861U32 get_max_depth (JSON *self)
1862 CODE:
1863 RETVAL = self->max_depth;
921 OUTPUT: 1864 OUTPUT:
922 RETVAL 1865 RETVAL
923 1866
924SV *ascii (SV *self, int enable = 1) 1867void max_size (JSON *self, U32 max_size = 0)
925 ALIAS: 1868 PPCODE:
926 ascii = F_ASCII 1869 self->max_size = max_size;
927 utf8 = F_UTF8 1870 XPUSHs (ST (0));
928 indent = F_INDENT 1871
929 canonical = F_CANONICAL 1872int get_max_size (JSON *self)
930 space_before = F_SPACE_BEFORE
931 space_after = F_SPACE_AFTER
932 json_rpc = F_JSON_RPC
933 pretty = F_PRETTY
934 allow_nonref = F_ALLOW_NONREF
935 shrink = F_SHRINK
936 CODE: 1873 CODE:
937{ 1874 RETVAL = self->max_size;
938 UV *uv = SvJSON (self);
939 if (enable)
940 *uv |= ix;
941 else
942 *uv &= ~ix;
943
944 RETVAL = newSVsv (self);
945}
946 OUTPUT: 1875 OUTPUT:
947 RETVAL 1876 RETVAL
948 1877
949void encode (SV *self, SV *scalar) 1878void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
950 PPCODE: 1879 PPCODE:
951 XPUSHs (encode_json (scalar, *SvJSON (self))); 1880{
1881 SvREFCNT_dec (self->cb_object);
1882 self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
952 1883
953void decode (SV *self, SV *jsonstr) 1884 XPUSHs (ST (0));
1885}
1886
1887void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
954 PPCODE: 1888 PPCODE:
1889{
1890 if (!self->cb_sk_object)
1891 self->cb_sk_object = newHV ();
1892
1893 if (SvOK (cb))
1894 hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
1895 else
1896 {
1897 hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
1898
1899 if (!HvKEYS (self->cb_sk_object))
1900 {
1901 SvREFCNT_dec (self->cb_sk_object);
1902 self->cb_sk_object = 0;
1903 }
1904 }
1905
1906 XPUSHs (ST (0));
1907}
1908
1909void encode (JSON *self, SV *scalar)
1910 PPCODE:
1911 XPUSHs (encode_json (scalar, self));
1912
1913void decode (JSON *self, SV *jsonstr)
1914 PPCODE:
955 XPUSHs (decode_json (jsonstr, *SvJSON (self))); 1915 XPUSHs (decode_json (jsonstr, self, 0));
1916
1917void decode_prefix (JSON *self, SV *jsonstr)
1918 PPCODE:
1919{
1920 char *offset;
1921 EXTEND (SP, 2);
1922 PUSHs (decode_json (jsonstr, self, &offset));
1923 PUSHs (sv_2mortal (newSVuv (ptr_to_index (jsonstr, offset))));
1924}
1925
1926void incr_parse (JSON *self, SV *jsonstr = 0)
1927 PPCODE:
1928{
1929 if (!self->incr_text)
1930 self->incr_text = newSVpvn ("", 0);
1931
1932 // append data, if any
1933 if (jsonstr)
1934 {
1935 if (SvUTF8 (jsonstr))
1936 {
1937 if (!SvUTF8 (self->incr_text))
1938 {
1939 /* utf-8-ness differs, need to upgrade */
1940 sv_utf8_upgrade (self->incr_text);
1941
1942 if (self->incr_pos)
1943 self->incr_pos = utf8_hop ((U8 *)SvPVX (self->incr_text), self->incr_pos)
1944 - (U8 *)SvPVX (self->incr_text);
1945 }
1946 }
1947 else if (SvUTF8 (self->incr_text))
1948 sv_utf8_upgrade (jsonstr);
1949
1950 {
1951 STRLEN len;
1952 const char *str = SvPV (jsonstr, len);
1953 STRLEN cur = SvCUR (self->incr_text);
1954
1955 if (SvLEN (self->incr_text) <= cur + len)
1956 SvGROW (self->incr_text, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
1957
1958 Move (str, SvEND (self->incr_text), len, char);
1959 SvCUR_set (self->incr_text, SvCUR (self->incr_text) + len);
1960 *SvEND (self->incr_text) = 0; // this should basically be a nop, too, but make sure it's there
1961 }
1962 }
1963
1964 if (GIMME_V != G_VOID)
1965 do
1966 {
1967 char *offset;
1968
1969 if (!INCR_DONE (self))
1970 {
1971 incr_parse (self);
1972
1973 if (self->incr_pos > self->max_size && self->max_size)
1974 croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
1975 (unsigned long)self->incr_pos, (unsigned long)self->max_size);
1976
1977 if (!INCR_DONE (self))
1978 break;
1979 }
1980
1981 XPUSHs (decode_json (self->incr_text, self, &offset));
1982
1983 self->incr_pos -= offset - SvPVX (self->incr_text);
1984 self->incr_nest = 0;
1985 self->incr_mode = 0;
1986
1987 sv_chop (self->incr_text, offset);
1988 }
1989 while (GIMME_V == G_ARRAY);
1990}
1991
1992SV *incr_text (JSON *self)
1993 ATTRS: lvalue
1994 CODE:
1995{
1996 if (self->incr_pos)
1997 croak ("incr_text can not be called when the incremental parser already started parsing");
1998
1999 RETVAL = self->incr_text ? SvREFCNT_inc (self->incr_text) : &PL_sv_undef;
2000}
2001 OUTPUT:
2002 RETVAL
2003
2004void incr_skip (JSON *self)
2005 CODE:
2006{
2007 if (self->incr_pos)
2008 {
2009 sv_chop (self->incr_text, SvPV_nolen (self->incr_text) + self->incr_pos);
2010 self->incr_pos = 0;
2011 self->incr_nest = 0;
2012 self->incr_mode = 0;
2013 }
2014}
2015
2016void incr_reset (JSON *self)
2017 CODE:
2018{
2019 SvREFCNT_dec (self->incr_text);
2020 self->incr_text = 0;
2021 self->incr_pos = 0;
2022 self->incr_nest = 0;
2023 self->incr_mode = 0;
2024}
2025
2026void DESTROY (JSON *self)
2027 CODE:
2028 SvREFCNT_dec (self->cb_sk_object);
2029 SvREFCNT_dec (self->cb_object);
2030 SvREFCNT_dec (self->incr_text);
956 2031
957PROTOTYPES: ENABLE 2032PROTOTYPES: ENABLE
958 2033
959void to_json (SV *scalar) 2034void encode_json (SV *scalar)
2035 ALIAS:
2036 to_json_ = 0
2037 encode_json = F_UTF8
960 PPCODE: 2038 PPCODE:
2039{
2040 JSON json;
2041 json_init (&json);
2042 json.flags |= ix;
961 XPUSHs (encode_json (scalar, F_UTF8)); 2043 XPUSHs (encode_json (scalar, &json));
2044}
962 2045
963void from_json (SV *jsonstr) 2046void decode_json (SV *jsonstr)
2047 ALIAS:
2048 from_json_ = 0
2049 decode_json = F_UTF8
964 PPCODE: 2050 PPCODE:
2051{
2052 JSON json;
2053 json_init (&json);
2054 json.flags |= ix;
965 XPUSHs (decode_json (jsonstr, F_UTF8)); 2055 XPUSHs (decode_json (jsonstr, &json, 0));
2056}
966 2057

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