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Comparing JSON-XS/XS.xs (file contents):
Revision 1.2 by root, Thu Mar 22 17:28:50 2007 UTC vs.
Revision 1.116 by root, Thu May 23 09:31:32 2013 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 32#define F_ALLOW_NONREF 0x00000100UL
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
16 39
17#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER 40#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
18#define F_DEFAULT 0
19 41
20#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
46
47#define DECODE_WANTS_OCTETS(json) ((json)->flags & F_UTF8)
21 48
22#define SB do { 49#define SB do {
23#define SE } while (0) 50#define SE } while (0)
24 51
25static HV *json_stash; 52#if __GNUC__ >= 3
53# define expect(expr,value) __builtin_expect ((expr), (value))
54# define INLINE static inline
55#else
56# define expect(expr,value) (expr)
57# define INLINE static
58#endif
59
60#define expect_false(expr) expect ((expr) != 0, 0)
61#define expect_true(expr) expect ((expr) != 0, 1)
62
63#define IN_RANGE_INC(type,val,beg,end) \
64 ((unsigned type)((unsigned type)(val) - (unsigned type)(beg)) \
65 <= (unsigned type)((unsigned type)(end) - (unsigned type)(beg)))
66
67#define ERR_NESTING_EXCEEDED "json text or perl structure exceeds maximum nesting level (max_depth set too low?)"
68
69#ifdef USE_ITHREADS
70# define JSON_SLOW 1
71# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
72#else
73# define JSON_SLOW 0
74# define JSON_STASH json_stash
75#endif
76
77// the amount of HEs to allocate on the stack, when sorting keys
78#define STACK_HES 64
79
80static HV *json_stash, *json_boolean_stash; // JSON::XS::
81static SV *json_true, *json_false;
82
83enum {
84 INCR_M_WS = 0, // initial whitespace skipping, must be 0
85 INCR_M_STR, // inside string
86 INCR_M_BS, // inside backslash
87 INCR_M_C0, // inside comment in initial whitespace sequence
88 INCR_M_C1, // inside comment in other places
89 INCR_M_JSON // outside anything, count nesting
90};
91
92#define INCR_DONE(json) ((json)->incr_nest <= 0 && (json)->incr_mode == INCR_M_JSON)
93
94typedef struct {
95 U32 flags;
96 U32 max_depth;
97 STRLEN max_size;
98
99 SV *cb_object;
100 HV *cb_sk_object;
101
102 // for the incremental parser
103 SV *incr_text; // the source text so far
104 STRLEN incr_pos; // the current offset into the text
105 int incr_nest; // {[]}-nesting level
106 unsigned char incr_mode;
107} JSON;
108
109INLINE void
110json_init (JSON *json)
111{
112 Zero (json, 1, JSON);
113 json->max_depth = 512;
114}
115
116/////////////////////////////////////////////////////////////////////////////
117// utility functions
118
119INLINE SV *
120get_bool (const char *name)
121{
122 SV *sv = get_sv (name, 1);
123
124 SvREADONLY_on (sv);
125 SvREADONLY_on (SvRV (sv));
126
127 return sv;
128}
129
130INLINE void
131shrink (SV *sv)
132{
133 sv_utf8_downgrade (sv, 1);
134
135 if (SvLEN (sv) > SvCUR (sv) + 1)
136 {
137#ifdef SvPV_shrink_to_cur
138 SvPV_shrink_to_cur (sv);
139#elif defined (SvPV_renew)
140 SvPV_renew (sv, SvCUR (sv) + 1);
141#endif
142 }
143}
144
145// decode an utf-8 character and return it, or (UV)-1 in
146// case of an error.
147// we special-case "safe" characters from U+80 .. U+7FF,
148// but use the very good perl function to parse anything else.
149// note that we never call this function for a ascii codepoints
150INLINE UV
151decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
152{
153 if (expect_true (len >= 2
154 && IN_RANGE_INC (char, s[0], 0xc2, 0xdf)
155 && IN_RANGE_INC (char, s[1], 0x80, 0xbf)))
156 {
157 *clen = 2;
158 return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
159 }
160 else
161 return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
162}
163
164// likewise for encoding, also never called for ascii codepoints
165// this function takes advantage of this fact, although current gccs
166// seem to optimise the check for >= 0x80 away anyways
167INLINE unsigned char *
168encode_utf8 (unsigned char *s, UV ch)
169{
170 if (expect_false (ch < 0x000080))
171 *s++ = ch;
172 else if (expect_true (ch < 0x000800))
173 *s++ = 0xc0 | ( ch >> 6),
174 *s++ = 0x80 | ( ch & 0x3f);
175 else if ( ch < 0x010000)
176 *s++ = 0xe0 | ( ch >> 12),
177 *s++ = 0x80 | ((ch >> 6) & 0x3f),
178 *s++ = 0x80 | ( ch & 0x3f);
179 else if ( ch < 0x110000)
180 *s++ = 0xf0 | ( ch >> 18),
181 *s++ = 0x80 | ((ch >> 12) & 0x3f),
182 *s++ = 0x80 | ((ch >> 6) & 0x3f),
183 *s++ = 0x80 | ( ch & 0x3f);
184
185 return s;
186}
187
188// convert offset pointer to character index, sv must be string
189static STRLEN
190ptr_to_index (SV *sv, char *offset)
191{
192 return SvUTF8 (sv)
193 ? utf8_distance (offset, SvPVX (sv))
194 : offset - SvPVX (sv);
195}
196
197/////////////////////////////////////////////////////////////////////////////
198// fp hell
199
200// scan a group of digits, and a trailing exponent
201static void
202json_atof_scan1 (const char *s, NV *accum, int *expo, int postdp, int maxdepth)
203{
204 UV uaccum = 0;
205 int eaccum = 0;
206
207 // if we recurse too deep, skip all remaining digits
208 // to avoid a stack overflow attack
209 if (expect_false (--maxdepth <= 0))
210 while (((U8)*s - '0') < 10)
211 ++s;
212
213 for (;;)
214 {
215 U8 dig = (U8)*s - '0';
216
217 if (expect_false (dig >= 10))
218 {
219 if (dig == (U8)((U8)'.' - (U8)'0'))
220 {
221 ++s;
222 json_atof_scan1 (s, accum, expo, 1, maxdepth);
223 }
224 else if ((dig | ' ') == 'e' - '0')
225 {
226 int exp2 = 0;
227 int neg = 0;
228
229 ++s;
230
231 if (*s == '-')
232 {
233 ++s;
234 neg = 1;
235 }
236 else if (*s == '+')
237 ++s;
238
239 while ((dig = (U8)*s - '0') < 10)
240 exp2 = exp2 * 10 + *s++ - '0';
241
242 *expo += neg ? -exp2 : exp2;
243 }
244
245 break;
246 }
247
248 ++s;
249
250 uaccum = uaccum * 10 + dig;
251 ++eaccum;
252
253 // if we have too many digits, then recurse for more
254 // we actually do this for rather few digits
255 if (uaccum >= (UV_MAX - 9) / 10)
256 {
257 if (postdp) *expo -= eaccum;
258 json_atof_scan1 (s, accum, expo, postdp, maxdepth);
259 if (postdp) *expo += eaccum;
260
261 break;
262 }
263 }
264
265 // this relies greatly on the quality of the pow ()
266 // implementation of the platform, but a good
267 // implementation is hard to beat.
268 // (IEEE 754 conformant ones are required to be exact)
269 if (postdp) *expo -= eaccum;
270 *accum += uaccum * Perl_pow (10., *expo);
271 *expo += eaccum;
272}
273
274static NV
275json_atof (const char *s)
276{
277 NV accum = 0.;
278 int expo = 0;
279 int neg = 0;
280
281 if (*s == '-')
282 {
283 ++s;
284 neg = 1;
285 }
286
287 // a recursion depth of ten gives us >>500 bits
288 json_atof_scan1 (s, &accum, &expo, 0, 10);
289
290 return neg ? -accum : accum;
291}
292/////////////////////////////////////////////////////////////////////////////
293// encoder
26 294
27// structure used for encoding JSON 295// structure used for encoding JSON
28typedef struct 296typedef struct
29{ 297{
30 char *cur; 298 char *cur; // SvPVX (sv) + current output position
31 STRLEN len; // SvLEN (sv)
32 char *end; // SvEND (sv) 299 char *end; // SvEND (sv)
33 SV *sv; 300 SV *sv; // result scalar
34 UV flags; 301 JSON json;
35 int max_recurse; 302 U32 indent; // indentation level
36 int indent; 303 UV limit; // escape character values >= this value when encoding
37} enc_t; 304} enc_t;
38 305
39// structure used for decoding JSON 306INLINE void
40typedef struct
41{
42 char *cur;
43 char *end;
44 char *err;
45 UV flags;
46} dec_t;
47
48static UV *
49SvJSON (SV *sv)
50{
51 if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
52 croak ("object is not of type JSON::XS");
53
54 return &SvUVX (SvRV (sv));
55}
56
57/////////////////////////////////////////////////////////////////////////////
58
59static void
60need (enc_t *enc, STRLEN len) 307need (enc_t *enc, STRLEN len)
61{ 308{
62 if (enc->cur + len >= enc->end) 309 if (expect_false (enc->cur + len >= enc->end))
63 { 310 {
64 STRLEN cur = enc->cur - SvPVX (enc->sv); 311 STRLEN cur = enc->cur - (char *)SvPVX (enc->sv);
65 SvGROW (enc->sv, cur + len + 1); 312 SvGROW (enc->sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
66 enc->cur = SvPVX (enc->sv) + cur; 313 enc->cur = SvPVX (enc->sv) + cur;
67 enc->end = SvEND (enc->sv); 314 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
68 } 315 }
69} 316}
70 317
71static void 318INLINE void
72encode_ch (enc_t *enc, char ch) 319encode_ch (enc_t *enc, char ch)
73{ 320{
74 need (enc, 1); 321 need (enc, 1);
75 *enc->cur++ = ch; 322 *enc->cur++ = ch;
76} 323}
… …
78static void 325static void
79encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8) 326encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8)
80{ 327{
81 char *end = str + len; 328 char *end = str + len;
82 329
330 need (enc, len);
331
83 while (str < end) 332 while (str < end)
84 { 333 {
85 unsigned char ch = *(unsigned char *)str; 334 unsigned char ch = *(unsigned char *)str;
335
86 if (ch >= 0x20 && ch < 0x80) // most common case 336 if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
87 { 337 {
338 if (expect_false (ch == '"')) // but with slow exceptions
339 {
340 need (enc, len += 1);
341 *enc->cur++ = '\\';
342 *enc->cur++ = '"';
343 }
344 else if (expect_false (ch == '\\'))
345 {
346 need (enc, len += 1);
347 *enc->cur++ = '\\';
348 *enc->cur++ = '\\';
349 }
350 else
88 *enc->cur++ = ch; 351 *enc->cur++ = ch;
352
89 str++; 353 ++str;
90 } 354 }
91 else 355 else
92 { 356 {
93 STRLEN clen; 357 switch (ch)
94 UV uch;
95
96 if (is_utf8)
97 {
98 uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);
99 if (clen < 0)
100 croak ("malformed UTF-8 character in string, cannot convert to JSON");
101 } 358 {
102 else 359 case '\010': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
103 { 360 case '\011': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
104 uch = ch; 361 case '\012': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
105 clen = 1; 362 case '\014': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
106 } 363 case '\015': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
107 364
108 need (enc, len += 6); 365 default:
109
110 if (uch < 0xa0 || enc->flags & F_ASCII)
111 {
112 if (uch > 0xFFFFUL)
113 { 366 {
367 STRLEN clen;
368 UV uch;
369
370 if (is_utf8)
371 {
372 uch = decode_utf8 (str, end - str, &clen);
373 if (clen == (STRLEN)-1)
374 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
375 }
376 else
377 {
378 uch = ch;
114 len += 6; 379 clen = 1;
380 }
381
382 if (uch < 0x80/*0x20*/ || uch >= enc->limit)
383 {
384 if (uch >= 0x10000UL)
385 {
386 if (uch >= 0x110000UL)
387 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
388
115 need (enc, len += 6); 389 need (enc, len += 11);
116 sprintf (enc->cur, "\\u%04x\\u%04x", 390 sprintf (enc->cur, "\\u%04x\\u%04x",
117 (uch - 0x10000) / 0x400 + 0xD800, 391 (int)((uch - 0x10000) / 0x400 + 0xD800),
118 (uch - 0x10000) % 0x400 + 0xDC00); 392 (int)((uch - 0x10000) % 0x400 + 0xDC00));
119 enc->cur += 12; 393 enc->cur += 12;
394 }
395 else
396 {
397 need (enc, len += 5);
398 *enc->cur++ = '\\';
399 *enc->cur++ = 'u';
400 *enc->cur++ = PL_hexdigit [ uch >> 12 ];
401 *enc->cur++ = PL_hexdigit [(uch >> 8) & 15];
402 *enc->cur++ = PL_hexdigit [(uch >> 4) & 15];
403 *enc->cur++ = PL_hexdigit [(uch >> 0) & 15];
404 }
405
406 str += clen;
407 }
408 else if (enc->json.flags & F_LATIN1)
409 {
410 *enc->cur++ = uch;
411 str += clen;
412 }
413 else if (is_utf8)
414 {
415 need (enc, len += clen);
416 do
417 {
418 *enc->cur++ = *str++;
419 }
420 while (--clen);
421 }
422 else
423 {
424 need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
425 enc->cur = encode_utf8 (enc->cur, uch);
426 ++str;
427 }
120 } 428 }
121 else
122 {
123 sprintf (enc->cur, "\\u%04x", uch);
124 enc->cur += 6;
125 }
126 }
127 else if (is_utf8)
128 { 429 }
129 memcpy (enc->cur, str, clen);
130 enc->cur += clen;
131 }
132 else
133 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
134
135 str += clen;
136 } 430 }
137 431
138 --len; 432 --len;
139 } 433 }
140} 434}
141 435
142#define INDENT SB \ 436INLINE void
437encode_indent (enc_t *enc)
438{
143 if (enc->flags & F_INDENT) \ 439 if (enc->json.flags & F_INDENT)
144 { \ 440 {
145 int i_; \ 441 int spaces = enc->indent * INDENT_STEP;
146 need (enc, enc->indent); \ 442
147 for (i_ = enc->indent * 3; i_--; )\ 443 need (enc, spaces);
444 memset (enc->cur, ' ', spaces);
445 enc->cur += spaces;
446 }
447}
448
449INLINE void
450encode_space (enc_t *enc)
451{
452 need (enc, 1);
453 encode_ch (enc, ' ');
454}
455
456INLINE void
457encode_nl (enc_t *enc)
458{
459 if (enc->json.flags & F_INDENT)
460 {
461 need (enc, 1);
148 encode_ch (enc, ' '); \ 462 encode_ch (enc, '\n');
149 } \ 463 }
150 SE 464}
151 465
152#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE 466INLINE void
153#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE 467encode_comma (enc_t *enc)
154#define COMMA SB \ 468{
155 encode_ch (enc, ','); \ 469 encode_ch (enc, ',');
470
156 if (enc->flags & F_INDENT) \ 471 if (enc->json.flags & F_INDENT)
157 NL; \ 472 encode_nl (enc);
158 else if (enc->flags & F_SPACE_AFTER) \ 473 else if (enc->json.flags & F_SPACE_AFTER)
159 SPACE; \ 474 encode_space (enc);
160 SE 475}
161 476
162static void encode_sv (enc_t *enc, SV *sv); 477static void encode_sv (enc_t *enc, SV *sv);
163 478
164static void 479static void
165encode_av (enc_t *enc, AV *av) 480encode_av (enc_t *enc, AV *av)
166{ 481{
167 int i, len = av_len (av); 482 int i, len = av_len (av);
168 483
484 if (enc->indent >= enc->json.max_depth)
485 croak (ERR_NESTING_EXCEEDED);
486
169 encode_ch (enc, '['); NL; 487 encode_ch (enc, '[');
170 ++enc->indent; 488
489 if (len >= 0)
490 {
491 encode_nl (enc); ++enc->indent;
171 492
172 for (i = 0; i <= len; ++i) 493 for (i = 0; i <= len; ++i)
173 { 494 {
174 INDENT; 495 SV **svp = av_fetch (av, i, 0);
175 encode_sv (enc, *av_fetch (av, i, 0));
176 496
497 encode_indent (enc);
498
499 if (svp)
500 encode_sv (enc, *svp);
501 else
502 encode_str (enc, "null", 4, 0);
503
177 if (i < len) 504 if (i < len)
178 COMMA; 505 encode_comma (enc);
179 } 506 }
180 507
181 NL; 508 encode_nl (enc); --enc->indent; encode_indent (enc);
182 509 }
183 --enc->indent; 510
184 INDENT; encode_ch (enc, ']'); 511 encode_ch (enc, ']');
185} 512}
186 513
187static void 514static void
188encode_he (enc_t *enc, HE *he) 515encode_hk (enc_t *enc, HE *he)
189{ 516{
190 encode_ch (enc, '"'); 517 encode_ch (enc, '"');
191 518
192 if (HeKLEN (he) == HEf_SVKEY) 519 if (HeKLEN (he) == HEf_SVKEY)
193 { 520 {
194 SV *sv = HeSVKEY (he); 521 SV *sv = HeSVKEY (he);
195 STRLEN len; 522 STRLEN len;
523 char *str;
524
525 SvGETMAGIC (sv);
196 char *str = SvPV (sv, len); 526 str = SvPV (sv, len);
197 527
198 encode_str (enc, str, len, SvUTF8 (sv)); 528 encode_str (enc, str, len, SvUTF8 (sv));
199 } 529 }
200 else 530 else
201 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he)); 531 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
202 532
203 encode_ch (enc, '"'); 533 encode_ch (enc, '"');
204 534
205 if (enc->flags & F_SPACE_BEFORE) SPACE; 535 if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
206 encode_ch (enc, ':'); 536 encode_ch (enc, ':');
207 if (enc->flags & F_SPACE_AFTER ) SPACE; 537 if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
208 encode_sv (enc, HeVAL (he));
209} 538}
210 539
211// compare hash entries, used when all keys are bytestrings 540// compare hash entries, used when all keys are bytestrings
212static int 541static int
213he_cmp_fast (const void *a_, const void *b_) 542he_cmp_fast (const void *a_, const void *b_)
… …
218 HE *b = *(HE **)b_; 547 HE *b = *(HE **)b_;
219 548
220 STRLEN la = HeKLEN (a); 549 STRLEN la = HeKLEN (a);
221 STRLEN lb = HeKLEN (b); 550 STRLEN lb = HeKLEN (b);
222 551
223 if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb))) 552 if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
224 cmp = la < lb ? -1 : la == lb ? 0 : 1; 553 cmp = lb - la;
225 554
226 return cmp; 555 return cmp;
227} 556}
228 557
229// compare hash entries, used when some keys are sv's or utf-x 558// compare hash entries, used when some keys are sv's or utf-x
230static int 559static int
231he_cmp_slow (const void *a, const void *b) 560he_cmp_slow (const void *a, const void *b)
232{ 561{
233 return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b)); 562 return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
234} 563}
235 564
236static void 565static void
237encode_hv (enc_t *enc, HV *hv) 566encode_hv (enc_t *enc, HV *hv)
238{ 567{
239 int count, i; 568 HE *he;
240 569
241 encode_ch (enc, '{'); NL; ++enc->indent; 570 if (enc->indent >= enc->json.max_depth)
571 croak (ERR_NESTING_EXCEEDED);
242 572
243 if ((count = hv_iterinit (hv))) 573 encode_ch (enc, '{');
244 { 574
245 // for canonical output we have to sort by keys first 575 // for canonical output we have to sort by keys first
246 // actually, this is mostly due to the stupid so-called 576 // actually, this is mostly due to the stupid so-called
247 // security workaround added somewhere in 5.8.x. 577 // security workaround added somewhere in 5.8.x
248 // that randomises hash orderings 578 // that randomises hash orderings
249 if (enc->flags & F_CANONICAL) 579 if (enc->json.flags & F_CANONICAL && !SvRMAGICAL (hv))
580 {
581 int count = hv_iterinit (hv);
582
583 if (SvMAGICAL (hv))
250 { 584 {
251 HE *he, *hes [count]; 585 // need to count by iterating. could improve by dynamically building the vector below
586 // but I don't care for the speed of this special case.
587 // note also that we will run into undefined behaviour when the two iterations
588 // do not result in the same count, something I might care for in some later release.
589
590 count = 0;
591 while (hv_iternext (hv))
592 ++count;
593
594 hv_iterinit (hv);
595 }
596
597 if (count)
598 {
252 int fast = 1; 599 int i, fast = 1;
600 HE *hes_stack [STACK_HES];
601 HE **hes = hes_stack;
602
603 // allocate larger arrays on the heap
604 if (count > STACK_HES)
605 {
606 SV *sv = sv_2mortal (NEWSV (0, count * sizeof (*hes)));
607 hes = (HE **)SvPVX (sv);
608 }
253 609
254 i = 0; 610 i = 0;
255 while ((he = hv_iternext (hv))) 611 while ((he = hv_iternext (hv)))
256 { 612 {
257 hes [i++] = he; 613 hes [i++] = he;
… …
263 619
264 if (fast) 620 if (fast)
265 qsort (hes, count, sizeof (HE *), he_cmp_fast); 621 qsort (hes, count, sizeof (HE *), he_cmp_fast);
266 else 622 else
267 { 623 {
268 // hack to disable "use bytes" 624 // hack to forcefully disable "use bytes"
269 COP *oldcop = PL_curcop, cop; 625 COP cop = *PL_curcop;
270 cop.op_private = 0; 626 cop.op_private = 0;
627
628 ENTER;
629 SAVETMPS;
630
631 SAVEVPTR (PL_curcop);
271 PL_curcop = &cop; 632 PL_curcop = &cop;
272 633
273 SAVETMPS;
274 qsort (hes, count, sizeof (HE *), he_cmp_slow); 634 qsort (hes, count, sizeof (HE *), he_cmp_slow);
635
275 FREETMPS; 636 FREETMPS;
637 LEAVE;
638 }
276 639
277 PL_curcop = oldcop; 640 encode_nl (enc); ++enc->indent;
641
642 while (count--)
278 } 643 {
644 encode_indent (enc);
645 he = hes [count];
646 encode_hk (enc, he);
647 encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
279 648
280 for (i = 0; i < count; ++i) 649 if (count)
650 encode_comma (enc);
651 }
652
653 encode_nl (enc); --enc->indent; encode_indent (enc);
654 }
655 }
656 else
657 {
658 if (hv_iterinit (hv) || SvMAGICAL (hv))
659 if ((he = hv_iternext (hv)))
660 {
661 encode_nl (enc); ++enc->indent;
662
663 for (;;)
281 { 664 {
282 INDENT; 665 encode_indent (enc);
283 encode_he (enc, hes [i]); 666 encode_hk (enc, he);
667 encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
284 668
285 if (i < count - 1) 669 if (!(he = hv_iternext (hv)))
286 COMMA; 670 break;
671
672 encode_comma (enc);
287 } 673 }
288 674
675 encode_nl (enc); --enc->indent; encode_indent (enc);
289 NL; 676 }
677 }
678
679 encode_ch (enc, '}');
680}
681
682// encode objects, arrays and special \0=false and \1=true values.
683static void
684encode_rv (enc_t *enc, SV *sv)
685{
686 svtype svt;
687
688 SvGETMAGIC (sv);
689 svt = SvTYPE (sv);
690
691 if (expect_false (SvOBJECT (sv)))
692 {
693 HV *stash = !JSON_SLOW || json_boolean_stash
694 ? json_boolean_stash
695 : gv_stashpv ("JSON::XS::Boolean", 1);
696
697 if (SvSTASH (sv) == stash)
698 {
699 if (SvIV (sv))
700 encode_str (enc, "true", 4, 0);
701 else
702 encode_str (enc, "false", 5, 0);
290 } 703 }
291 else 704 else
292 { 705 {
293 SV *sv; 706#if 0
294 HE *he = hv_iternext (hv); 707 if (0 && sv_derived_from (rv, "JSON::Literal"))
295
296 for (;;)
297 {
298 INDENT;
299 encode_he (enc, he);
300
301 if (!(he = hv_iternext (hv)))
302 break;
303
304 COMMA;
305 } 708 {
306 709 // not yet
307 NL; 710 }
711#endif
712 if (enc->json.flags & F_CONV_BLESSED)
713 {
714 // we re-bless the reference to get overload and other niceties right
715 GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
716
717 if (to_json)
718 {
719 dSP;
720
721 ENTER; SAVETMPS; PUSHMARK (SP);
722 XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
723
724 // calling with G_SCALAR ensures that we always get a 1 return value
725 PUTBACK;
726 call_sv ((SV *)GvCV (to_json), G_SCALAR);
727 SPAGAIN;
728
729 // catch this surprisingly common error
730 if (SvROK (TOPs) && SvRV (TOPs) == sv)
731 croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
732
733 sv = POPs;
734 PUTBACK;
735
736 encode_sv (enc, sv);
737
738 FREETMPS; LEAVE;
739 }
740 else if (enc->json.flags & F_ALLOW_BLESSED)
741 encode_str (enc, "null", 4, 0);
742 else
743 croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
744 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
745 }
746 else if (enc->json.flags & F_ALLOW_BLESSED)
747 encode_str (enc, "null", 4, 0);
748 else
749 croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
750 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
308 } 751 }
309 } 752 }
753 else if (svt == SVt_PVHV)
754 encode_hv (enc, (HV *)sv);
755 else if (svt == SVt_PVAV)
756 encode_av (enc, (AV *)sv);
757 else if (svt < SVt_PVAV)
758 {
759 STRLEN len = 0;
760 char *pv = svt ? SvPV (sv, len) : 0;
310 761
311 --enc->indent; INDENT; encode_ch (enc, '}'); 762 if (len == 1 && *pv == '1')
763 encode_str (enc, "true", 4, 0);
764 else if (len == 1 && *pv == '0')
765 encode_str (enc, "false", 5, 0);
766 else if (enc->json.flags & F_ALLOW_UNKNOWN)
767 encode_str (enc, "null", 4, 0);
768 else
769 croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
770 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
771 }
772 else if (enc->json.flags & F_ALLOW_UNKNOWN)
773 encode_str (enc, "null", 4, 0);
774 else
775 croak ("encountered %s, but JSON can only represent references to arrays or hashes",
776 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
312} 777}
313 778
314static void 779static void
315encode_sv (enc_t *enc, SV *sv) 780encode_sv (enc_t *enc, SV *sv)
316{ 781{
782 SvGETMAGIC (sv);
783
317 if (SvPOKp (sv)) 784 if (SvPOKp (sv))
318 { 785 {
319 STRLEN len; 786 STRLEN len;
320 char *str = SvPV (sv, len); 787 char *str = SvPV (sv, len);
321 encode_ch (enc, '"'); 788 encode_ch (enc, '"');
322 encode_str (enc, str, len, SvUTF8 (sv)); 789 encode_str (enc, str, len, SvUTF8 (sv));
323 encode_ch (enc, '"'); 790 encode_ch (enc, '"');
324 } 791 }
325 else if (SvNOKp (sv)) 792 else if (SvNOKp (sv))
326 { 793 {
794 // trust that perl will do the right thing w.r.t. JSON syntax.
327 need (enc, NV_DIG + 32); 795 need (enc, NV_DIG + 32);
328 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 796 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
329 enc->cur += strlen (enc->cur); 797 enc->cur += strlen (enc->cur);
330 } 798 }
331 else if (SvIOKp (sv)) 799 else if (SvIOKp (sv))
332 { 800 {
801 // we assume we can always read an IV as a UV and vice versa
802 // we assume two's complement
803 // we assume no aliasing issues in the union
804 if (SvIsUV (sv) ? SvUVX (sv) <= 59000
805 : SvIVX (sv) <= 59000 && SvIVX (sv) >= -59000)
806 {
807 // optimise the "small number case"
808 // code will likely be branchless and use only a single multiplication
809 // works for numbers up to 59074
810 I32 i = SvIVX (sv);
811 U32 u;
812 char digit, nz = 0;
813
333 need (enc, 64); 814 need (enc, 6);
815
816 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
817 u = i < 0 ? -i : i;
818
819 // convert to 4.28 fixed-point representation
820 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
821
822 // now output digit by digit, each time masking out the integer part
823 // and multiplying by 5 while moving the decimal point one to the right,
824 // resulting in a net multiplication by 10.
825 // we always write the digit to memory but conditionally increment
826 // the pointer, to enable the use of conditional move instructions.
827 digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffffUL) * 5;
828 digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffffUL) * 5;
829 digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffffUL) * 5;
830 digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffffUL) * 5;
831 digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
832 }
833 else
834 {
835 // large integer, use the (rather slow) snprintf way.
836 need (enc, IVUV_MAXCHARS);
334 enc->cur += 837 enc->cur +=
335 SvIsUV(sv) 838 SvIsUV(sv)
336 ? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv)) 839 ? snprintf (enc->cur, IVUV_MAXCHARS, "%"UVuf, (UV)SvUVX (sv))
337 : snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv)); 840 : snprintf (enc->cur, IVUV_MAXCHARS, "%"IVdf, (IV)SvIVX (sv));
841 }
338 } 842 }
339 else if (SvROK (sv)) 843 else if (SvROK (sv))
340 { 844 encode_rv (enc, SvRV (sv));
341 if (!--enc->max_recurse) 845 else if (!SvOK (sv) || enc->json.flags & F_ALLOW_UNKNOWN)
342 croak ("data structure too deep (hit recursion limit)");
343
344 sv = SvRV (sv);
345
346 switch (SvTYPE (sv))
347 {
348 case SVt_PVAV: encode_av (enc, (AV *)sv); break;
349 case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
350
351 default:
352 croak ("JSON can only represent references to arrays or hashes");
353 }
354 }
355 else if (!SvOK (sv))
356 encode_str (enc, "null", 4, 0); 846 encode_str (enc, "null", 4, 0);
357 else 847 else
358 croak ("encountered perl type that JSON cannot handle"); 848 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
849 SvPV_nolen (sv), (unsigned int)SvFLAGS (sv));
359} 850}
360 851
361static SV * 852static SV *
362encode_json (SV *scalar, UV flags) 853encode_json (SV *scalar, JSON *json)
363{ 854{
364 enc_t enc; 855 enc_t enc;
365 enc.flags = flags; 856
857 if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
858 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
859
860 enc.json = *json;
366 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE)); 861 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
367 enc.cur = SvPVX (enc.sv); 862 enc.cur = SvPVX (enc.sv);
368 enc.end = SvEND (enc.sv); 863 enc.end = SvEND (enc.sv);
369 enc.max_recurse = 0;
370 enc.indent = 0; 864 enc.indent = 0;
865 enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
866 : enc.json.flags & F_LATIN1 ? 0x000100UL
867 : 0x110000UL;
371 868
372 SvPOK_only (enc.sv); 869 SvPOK_only (enc.sv);
373 encode_sv (&enc, scalar); 870 encode_sv (&enc, scalar);
871 encode_nl (&enc);
374 872
873 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
874 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
875
375 if (!(flags & (F_ASCII | F_UTF8))) 876 if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
376 SvUTF8_on (enc.sv); 877 SvUTF8_on (enc.sv);
377 878
378 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv)); 879 if (enc.json.flags & F_SHRINK)
880 shrink (enc.sv);
881
379 return enc.sv; 882 return enc.sv;
380} 883}
381 884
382///////////////////////////////////////////////////////////////////////////// 885/////////////////////////////////////////////////////////////////////////////
886// decoder
383 887
384#define WS \ 888// structure used for decoding JSON
889typedef struct
890{
891 char *cur; // current parser pointer
892 char *end; // end of input string
893 const char *err; // parse error, if != 0
894 JSON json;
895 U32 depth; // recursion depth
896 U32 maxdepth; // recursion depth limit
897} dec_t;
898
899INLINE void
900decode_comment (dec_t *dec)
901{
902 // only '#'-style comments allowed a.t.m.
903
904 while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
905 ++dec->cur;
906}
907
908INLINE void
909decode_ws (dec_t *dec)
910{
385 for (;;) \ 911 for (;;)
386 { \ 912 {
387 char ch = *dec->cur; \ 913 char ch = *dec->cur;
914
388 if (ch > 0x20 \ 915 if (ch > 0x20)
916 {
917 if (expect_false (ch == '#'))
918 {
919 if (dec->json.flags & F_RELAXED)
920 decode_comment (dec);
921 else
922 break;
923 }
924 else
925 break;
926 }
389 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \ 927 else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
390 break; \ 928 break; // parse error, but let higher level handle it, gives better error messages
929
391 ++dec->cur; \ 930 ++dec->cur;
392 } 931 }
932}
393 933
394#define ERR(reason) SB dec->err = reason; goto fail; SE 934#define ERR(reason) SB dec->err = reason; goto fail; SE
935
395#define EXPECT_CH(ch) SB \ 936#define EXPECT_CH(ch) SB \
396 if (*dec->cur != ch) \ 937 if (*dec->cur != ch) \
397 ERR (# ch " expected"); \ 938 ERR (# ch " expected"); \
398 ++dec->cur; \ 939 ++dec->cur; \
399 SE 940 SE
400 941
942#define DEC_INC_DEPTH if (++dec->depth > dec->json.max_depth) ERR (ERR_NESTING_EXCEEDED)
943#define DEC_DEC_DEPTH --dec->depth
944
401static SV *decode_sv (dec_t *dec); 945static SV *decode_sv (dec_t *dec);
402
403#define APPEND_CH(ch) SB \
404 SvGROW (sv, cur + 1 + 1); \
405 SvPVX (sv)[cur++] = (ch); \
406 SE
407 946
408static signed char decode_hexdigit[256]; 947static signed char decode_hexdigit[256];
409 948
410static UV 949static UV
411decode_4hex (dec_t *dec) 950decode_4hex (dec_t *dec)
412{ 951{
413 signed char d1, d2, d3, d4; 952 signed char d1, d2, d3, d4;
953 unsigned char *cur = (unsigned char *)dec->cur;
414 954
415 d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]]; 955 d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
416 if (d1 < 0) ERR ("four hexadecimal digits expected"); 956 d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
417 d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]]; 957 d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
418 if (d2 < 0) ERR ("four hexadecimal digits expected"); 958 d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
419 d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
420 if (d3 < 0) ERR ("four hexadecimal digits expected");
421 d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
422 if (d4 < 0) ERR ("four hexadecimal digits expected");
423 959
424 dec->cur += 4; 960 dec->cur += 4;
425 961
426 return ((UV)d1) << 12 962 return ((UV)d1) << 12
427 | ((UV)d2) << 8 963 | ((UV)d2) << 8
… …
433} 969}
434 970
435static SV * 971static SV *
436decode_str (dec_t *dec) 972decode_str (dec_t *dec)
437{ 973{
438 SV *sv = NEWSV (0,2); 974 SV *sv = 0;
439 STRLEN cur = 0;
440 int utf8 = 0; 975 int utf8 = 0;
976 char *dec_cur = dec->cur;
441 977
442 for (;;) 978 do
443 { 979 {
444 unsigned char ch = *(unsigned char *)dec->cur; 980 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
981 char *cur = buf;
445 982
446 if (ch == '"') 983 do
447 break;
448 else if (ch == '\\')
449 { 984 {
450 switch (*++dec->cur) 985 unsigned char ch = *(unsigned char *)dec_cur++;
986
987 if (expect_false (ch == '"'))
988 {
989 --dec_cur;
990 break;
451 { 991 }
452 case '\\': 992 else if (expect_false (ch == '\\'))
453 case '/': 993 {
454 case '"': APPEND_CH (*dec->cur++); break; 994 switch (*dec_cur)
455
456 case 'b': APPEND_CH ('\010'); ++dec->cur; break;
457 case 't': APPEND_CH ('\011'); ++dec->cur; break;
458 case 'n': APPEND_CH ('\012'); ++dec->cur; break;
459 case 'f': APPEND_CH ('\014'); ++dec->cur; break;
460 case 'r': APPEND_CH ('\015'); ++dec->cur; break;
461
462 case 'u':
463 { 995 {
464 UV lo, hi; 996 case '\\':
465 ++dec->cur; 997 case '/':
998 case '"': *cur++ = *dec_cur++; break;
466 999
467 hi = decode_4hex (dec); 1000 case 'b': ++dec_cur; *cur++ = '\010'; break;
468 if (hi == (UV)-1) 1001 case 't': ++dec_cur; *cur++ = '\011'; break;
469 goto fail; 1002 case 'n': ++dec_cur; *cur++ = '\012'; break;
1003 case 'f': ++dec_cur; *cur++ = '\014'; break;
1004 case 'r': ++dec_cur; *cur++ = '\015'; break;
470 1005
471 // possibly a surrogate pair 1006 case 'u':
472 if (hi >= 0xd800 && hi < 0xdc00)
473 { 1007 {
474 if (dec->cur [0] != '\\' || dec->cur [1] != 'u') 1008 UV lo, hi;
475 ERR ("illegal surrogate character"); 1009 ++dec_cur;
476 1010
477 dec->cur += 2; 1011 dec->cur = dec_cur;
478
479 lo = decode_4hex (dec); 1012 hi = decode_4hex (dec);
1013 dec_cur = dec->cur;
480 if (lo == (UV)-1) 1014 if (hi == (UV)-1)
481 goto fail; 1015 goto fail;
482 1016
1017 // possibly a surrogate pair
1018 if (hi >= 0xd800)
1019 if (hi < 0xdc00)
1020 {
1021 if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
1022 ERR ("missing low surrogate character in surrogate pair");
1023
1024 dec_cur += 2;
1025
1026 dec->cur = dec_cur;
1027 lo = decode_4hex (dec);
1028 dec_cur = dec->cur;
1029 if (lo == (UV)-1)
1030 goto fail;
1031
483 if (lo < 0xdc00 || lo >= 0xe000) 1032 if (lo < 0xdc00 || lo >= 0xe000)
484 ERR ("surrogate pair expected"); 1033 ERR ("surrogate pair expected");
485 1034
486 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; 1035 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
1036 }
1037 else if (hi < 0xe000)
1038 ERR ("missing high surrogate character in surrogate pair");
1039
1040 if (hi >= 0x80)
1041 {
1042 utf8 = 1;
1043
1044 cur = encode_utf8 (cur, hi);
1045 }
1046 else
1047 *cur++ = hi;
487 } 1048 }
488 else if (lo >= 0xdc00 && lo < 0xe000)
489 ERR ("illegal surrogate character");
490
491 if (hi >= 0x80)
492 { 1049 break;
493 utf8 = 1;
494 1050
495 SvGROW (sv, cur + 4 + 1); // at most 4 bytes for 21 bits
496 cur = (char *)uvuni_to_utf8_flags (SvPVX (sv) + cur, hi, 0) - SvPVX (sv);
497 }
498 else 1051 default:
499 APPEND_CH (hi); 1052 --dec_cur;
1053 ERR ("illegal backslash escape sequence in string");
500 } 1054 }
1055 }
1056 else if (expect_true (ch >= 0x20 && ch < 0x80))
1057 *cur++ = ch;
1058 else if (ch >= 0x80)
1059 {
1060 STRLEN clen;
1061
1062 --dec_cur;
1063
1064 decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
1065 if (clen == (STRLEN)-1)
1066 ERR ("malformed UTF-8 character in JSON string");
1067
1068 do
1069 *cur++ = *dec_cur++;
1070 while (--clen);
1071
1072 utf8 = 1;
1073 }
1074 else
1075 {
1076 --dec_cur;
1077
1078 if (!ch)
1079 ERR ("unexpected end of string while parsing JSON string");
501 break; 1080 else
1081 ERR ("invalid character encountered while parsing JSON string");
502 } 1082 }
503 } 1083 }
504 else if (ch >= 0x20 && ch <= 0x7f) 1084 while (cur < buf + SHORT_STRING_LEN);
505 APPEND_CH (*dec->cur++); 1085
506 else if (ch >= 0x80) 1086 {
1087 STRLEN len = cur - buf;
1088
1089 if (sv)
507 { 1090 {
508 STRLEN clen; 1091 STRLEN cur = SvCUR (sv);
509 UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
510 if (clen < 0)
511 ERR ("malformed UTF-8 character in string, cannot convert to JSON");
512 1092
513 SvGROW (sv, cur + clen + 1); // at most 4 bytes for 21 bits 1093 if (SvLEN (sv) <= cur + len)
514 memcpy (SvPVX (sv) + cur, dec->cur, clen); 1094 SvGROW (sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
515 dec->cur += clen; 1095
1096 memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
1097 SvCUR_set (sv, SvCUR (sv) + len);
516 } 1098 }
517 else 1099 else
518 ERR ("invalid character encountered"); 1100 sv = newSVpvn (buf, len);
519 } 1101 }
1102 }
1103 while (*dec_cur != '"');
520 1104
521 ++dec->cur; 1105 ++dec_cur;
522 1106
1107 if (sv)
1108 {
523 SvPOK_only (sv); 1109 SvPOK_only (sv);
524
525 SvCUR_set (sv, cur);
526 *SvEND (sv) = 0; 1110 *SvEND (sv) = 0;
527 1111
528 if (utf8) 1112 if (utf8)
529 SvUTF8_on (sv); 1113 SvUTF8_on (sv);
1114 }
1115 else
1116 sv = newSVpvn ("", 0);
530 1117
1118 dec->cur = dec_cur;
531 return sv; 1119 return sv;
532 1120
533fail: 1121fail:
534 SvREFCNT_dec (sv); 1122 dec->cur = dec_cur;
535 return 0; 1123 return 0;
536} 1124}
537 1125
538static SV * 1126static SV *
539decode_num (dec_t *dec) 1127decode_num (dec_t *dec)
… …
549 { 1137 {
550 ++dec->cur; 1138 ++dec->cur;
551 if (*dec->cur >= '0' && *dec->cur <= '9') 1139 if (*dec->cur >= '0' && *dec->cur <= '9')
552 ERR ("malformed number (leading zero must not be followed by another digit)"); 1140 ERR ("malformed number (leading zero must not be followed by another digit)");
553 } 1141 }
554 1142 else if (*dec->cur < '0' || *dec->cur > '9')
555 // int 1143 ERR ("malformed number (no digits after initial minus)");
1144 else
1145 do
1146 {
1147 ++dec->cur;
1148 }
556 while (*dec->cur >= '0' && *dec->cur <= '9') 1149 while (*dec->cur >= '0' && *dec->cur <= '9');
557 ++dec->cur;
558 1150
559 // [frac] 1151 // [frac]
560 if (*dec->cur == '.') 1152 if (*dec->cur == '.')
561 { 1153 {
562 is_nv = 1; 1154 ++dec->cur;
1155
1156 if (*dec->cur < '0' || *dec->cur > '9')
1157 ERR ("malformed number (no digits after decimal point)");
563 1158
564 do 1159 do
565 { 1160 {
566 ++dec->cur; 1161 ++dec->cur;
567 } 1162 }
568 while (*dec->cur >= '0' && *dec->cur <= '9'); 1163 while (*dec->cur >= '0' && *dec->cur <= '9');
1164
1165 is_nv = 1;
569 } 1166 }
570 1167
571 // [exp] 1168 // [exp]
572 if (*dec->cur == 'e' || *dec->cur == 'E') 1169 if (*dec->cur == 'e' || *dec->cur == 'E')
573 { 1170 {
574 is_nv = 1;
575
576 ++dec->cur; 1171 ++dec->cur;
1172
577 if (*dec->cur == '-' || *dec->cur == '+') 1173 if (*dec->cur == '-' || *dec->cur == '+')
578 ++dec->cur; 1174 ++dec->cur;
579 1175
1176 if (*dec->cur < '0' || *dec->cur > '9')
1177 ERR ("malformed number (no digits after exp sign)");
1178
1179 do
1180 {
1181 ++dec->cur;
1182 }
580 while (*dec->cur >= '0' && *dec->cur <= '9') 1183 while (*dec->cur >= '0' && *dec->cur <= '9');
581 ++dec->cur; 1184
1185 is_nv = 1;
582 } 1186 }
583 1187
584 if (!is_nv) 1188 if (!is_nv)
585 { 1189 {
586 UV uv; 1190 int len = dec->cur - start;
587 int numtype = grok_number (start, dec->cur - start, &uv); 1191
588 if (numtype & IS_NUMBER_IN_UV) 1192 // special case the rather common 1..5-digit-int case
589 if (numtype & IS_NUMBER_NEG) 1193 if (*start == '-')
1194 switch (len)
590 { 1195 {
591 if (uv < (UV)IV_MIN) 1196 case 2: return newSViv (-(IV)( start [1] - '0' * 1));
592 return newSViv (-(IV)uv); 1197 case 3: return newSViv (-(IV)( start [1] * 10 + start [2] - '0' * 11));
1198 case 4: return newSViv (-(IV)( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
1199 case 5: return newSViv (-(IV)( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
1200 case 6: return newSViv (-(IV)(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
593 } 1201 }
1202 else
1203 switch (len)
1204 {
1205 case 1: return newSViv ( start [0] - '0' * 1);
1206 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
1207 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
1208 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
1209 case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
1210 }
1211
1212 {
1213 UV uv;
1214 int numtype = grok_number (start, len, &uv);
1215 if (numtype & IS_NUMBER_IN_UV)
1216 if (numtype & IS_NUMBER_NEG)
1217 {
1218 if (uv < (UV)IV_MIN)
1219 return newSViv (-(IV)uv);
1220 }
594 else 1221 else
595 return newSVuv (uv); 1222 return newSVuv (uv);
596 } 1223 }
597 1224
1225 len -= *start == '-' ? 1 : 0;
1226
1227 // does not fit into IV or UV, try NV
1228 if (len <= NV_DIG)
1229 // fits into NV without loss of precision
1230 return newSVnv (json_atof (start));
1231
1232 // everything else fails, convert it to a string
1233 return newSVpvn (start, dec->cur - start);
1234 }
1235
1236 // loss of precision here
598 return newSVnv (Atof (start)); 1237 return newSVnv (json_atof (start));
599 1238
600fail: 1239fail:
601 return 0; 1240 return 0;
602} 1241}
603 1242
604static SV * 1243static SV *
605decode_av (dec_t *dec) 1244decode_av (dec_t *dec)
606{ 1245{
607 AV *av = newAV (); 1246 AV *av = newAV ();
608 1247
1248 DEC_INC_DEPTH;
1249 decode_ws (dec);
1250
1251 if (*dec->cur == ']')
1252 ++dec->cur;
1253 else
609 for (;;) 1254 for (;;)
610 { 1255 {
611 SV *value; 1256 SV *value;
612 1257
613 value = decode_sv (dec); 1258 value = decode_sv (dec);
614 if (!value) 1259 if (!value)
615 goto fail; 1260 goto fail;
616 1261
617 av_push (av, value); 1262 av_push (av, value);
618 1263
619 WS; 1264 decode_ws (dec);
620 1265
621 if (*dec->cur == ']') 1266 if (*dec->cur == ']')
622 { 1267 {
623 ++dec->cur; 1268 ++dec->cur;
624 break; 1269 break;
1270 }
625 } 1271
626
627 if (*dec->cur != ',') 1272 if (*dec->cur != ',')
628 ERR (", or ] expected while parsing array"); 1273 ERR (", or ] expected while parsing array");
629 1274
630 ++dec->cur; 1275 ++dec->cur;
1276
1277 decode_ws (dec);
1278
1279 if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
1280 {
1281 ++dec->cur;
1282 break;
1283 }
631 } 1284 }
632 1285
1286 DEC_DEC_DEPTH;
633 return newRV_noinc ((SV *)av); 1287 return newRV_noinc ((SV *)av);
634 1288
635fail: 1289fail:
636 SvREFCNT_dec (av); 1290 SvREFCNT_dec (av);
1291 DEC_DEC_DEPTH;
637 return 0; 1292 return 0;
638} 1293}
639 1294
640static SV * 1295static SV *
641decode_hv (dec_t *dec) 1296decode_hv (dec_t *dec)
642{ 1297{
1298 SV *sv;
643 HV *hv = newHV (); 1299 HV *hv = newHV ();
644 1300
1301 DEC_INC_DEPTH;
1302 decode_ws (dec);
1303
1304 if (*dec->cur == '}')
1305 ++dec->cur;
1306 else
645 for (;;) 1307 for (;;)
646 { 1308 {
647 SV *key, *value;
648
649 WS; EXPECT_CH ('"'); 1309 EXPECT_CH ('"');
650 1310
651 key = decode_str (dec); 1311 // heuristic: assume that
652 if (!key) 1312 // a) decode_str + hv_store_ent are abysmally slow.
653 goto fail; 1313 // b) most hash keys are short, simple ascii text.
654 1314 // => try to "fast-match" such strings to avoid
655 WS; EXPECT_CH (':'); 1315 // the overhead of decode_str + hv_store_ent.
656
657 value = decode_sv (dec);
658 if (!value)
659 { 1316 {
1317 SV *value;
1318 char *p = dec->cur;
1319 char *e = p + 24; // only try up to 24 bytes
1320
1321 for (;;)
1322 {
1323 // the >= 0x80 is false on most architectures
1324 if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
1325 {
1326 // slow path, back up and use decode_str
1327 SV *key = decode_str (dec);
1328 if (!key)
1329 goto fail;
1330
1331 decode_ws (dec); EXPECT_CH (':');
1332
1333 decode_ws (dec);
1334 value = decode_sv (dec);
1335 if (!value)
1336 {
1337 SvREFCNT_dec (key);
1338 goto fail;
1339 }
1340
1341 hv_store_ent (hv, key, value, 0);
660 SvREFCNT_dec (key); 1342 SvREFCNT_dec (key);
1343
1344 break;
1345 }
1346 else if (*p == '"')
1347 {
1348 // fast path, got a simple key
1349 char *key = dec->cur;
1350 int len = p - key;
1351 dec->cur = p + 1;
1352
1353 decode_ws (dec); EXPECT_CH (':');
1354
1355 decode_ws (dec);
1356 value = decode_sv (dec);
1357 if (!value)
661 goto fail; 1358 goto fail;
1359
1360 hv_store (hv, key, len, value, 0);
1361
1362 break;
1363 }
1364
1365 ++p;
1366 }
662 } 1367 }
663 1368
664 //TODO: optimise 1369 decode_ws (dec);
665 hv_store_ent (hv, key, value, 0);
666 1370
667 WS;
668
669 if (*dec->cur == '}') 1371 if (*dec->cur == '}')
1372 {
1373 ++dec->cur;
1374 break;
1375 }
1376
1377 if (*dec->cur != ',')
1378 ERR (", or } expected while parsing object/hash");
1379
1380 ++dec->cur;
1381
1382 decode_ws (dec);
1383
1384 if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
1385 {
1386 ++dec->cur;
1387 break;
1388 }
1389 }
1390
1391 DEC_DEC_DEPTH;
1392 sv = newRV_noinc ((SV *)hv);
1393
1394 // check filter callbacks
1395 if (dec->json.flags & F_HOOK)
1396 {
1397 if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
670 { 1398 {
671 ++dec->cur; 1399 HE *cb, *he;
672 break; 1400
1401 hv_iterinit (hv);
1402 he = hv_iternext (hv);
1403 hv_iterinit (hv);
1404
1405 // the next line creates a mortal sv each time its called.
1406 // might want to optimise this for common cases.
1407 cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
1408
1409 if (cb)
1410 {
1411 dSP;
1412 int count;
1413
1414 ENTER; SAVETMPS; PUSHMARK (SP);
1415 XPUSHs (HeVAL (he));
1416 sv_2mortal (sv);
1417
1418 PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
1419
1420 if (count == 1)
1421 {
1422 sv = newSVsv (POPs);
1423 FREETMPS; LEAVE;
1424 return sv;
1425 }
1426
1427 SvREFCNT_inc (sv);
1428 FREETMPS; LEAVE;
1429 }
673 } 1430 }
674 1431
675 if (*dec->cur != ',') 1432 if (dec->json.cb_object)
676 ERR (", or } expected while parsing object/hash"); 1433 {
1434 dSP;
1435 int count;
677 1436
678 ++dec->cur; 1437 ENTER; SAVETMPS; PUSHMARK (SP);
679 } 1438 XPUSHs (sv_2mortal (sv));
680 1439
681 return newRV_noinc ((SV *)hv); 1440 PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
1441
1442 if (count == 1)
1443 {
1444 sv = newSVsv (POPs);
1445 FREETMPS; LEAVE;
1446 return sv;
1447 }
1448
1449 SvREFCNT_inc (sv);
1450 FREETMPS; LEAVE;
1451 }
1452 }
1453
1454 return sv;
682 1455
683fail: 1456fail:
684 SvREFCNT_dec (hv); 1457 SvREFCNT_dec (hv);
1458 DEC_DEC_DEPTH;
685 return 0; 1459 return 0;
686} 1460}
687 1461
688static SV * 1462static SV *
689decode_sv (dec_t *dec) 1463decode_sv (dec_t *dec)
690{ 1464{
691 WS; 1465 // the beauty of JSON: you need exactly one character lookahead
1466 // to parse everything.
692 switch (*dec->cur) 1467 switch (*dec->cur)
693 { 1468 {
694 case '"': ++dec->cur; return decode_str (dec); 1469 case '"': ++dec->cur; return decode_str (dec);
695 case '[': ++dec->cur; return decode_av (dec); 1470 case '[': ++dec->cur; return decode_av (dec);
696 case '{': ++dec->cur; return decode_hv (dec); 1471 case '{': ++dec->cur; return decode_hv (dec);
697 1472
698 case '-': 1473 case '-':
699 case '0': case '1': case '2': case '3': case '4': 1474 case '0': case '1': case '2': case '3': case '4':
700 case '5': case '6': case '7': case '8': case '9': 1475 case '5': case '6': case '7': case '8': case '9':
701 return decode_num (dec); 1476 return decode_num (dec);
702 1477
703 case 't': 1478 case 't':
704 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4)) 1479 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
705 { 1480 {
706 dec->cur += 4; 1481 dec->cur += 4;
1482#if JSON_SLOW
1483 json_true = get_bool ("JSON::XS::true");
1484#endif
707 return newSViv (1); 1485 return newSVsv (json_true);
708 } 1486 }
709 else 1487 else
710 ERR ("'true' expected"); 1488 ERR ("'true' expected");
711 1489
712 break; 1490 break;
713 1491
714 case 'f': 1492 case 'f':
715 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5)) 1493 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
716 { 1494 {
717 dec->cur += 5; 1495 dec->cur += 5;
1496#if JSON_SLOW
1497 json_false = get_bool ("JSON::XS::false");
1498#endif
718 return newSViv (0); 1499 return newSVsv (json_false);
719 } 1500 }
720 else 1501 else
721 ERR ("'false' expected"); 1502 ERR ("'false' expected");
722 1503
723 break; 1504 break;
724 1505
725 case 'n': 1506 case 'n':
726 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4)) 1507 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))
727 { 1508 {
728 dec->cur += 4; 1509 dec->cur += 4;
729 return newSViv (1); 1510 return newSVsv (&PL_sv_undef);
730 } 1511 }
731 else 1512 else
732 ERR ("'null' expected"); 1513 ERR ("'null' expected");
733 1514
734 break; 1515 break;
735 1516
736 default: 1517 default:
737 ERR ("malformed json string"); 1518 ERR ("malformed JSON string, neither array, object, number, string or atom");
738 break; 1519 break;
739 } 1520 }
740 1521
741fail: 1522fail:
742 return 0; 1523 return 0;
743} 1524}
744 1525
745static SV * 1526static SV *
746decode_json (SV *string, UV flags) 1527decode_json (SV *string, JSON *json, char **offset_return)
747{ 1528{
1529 dec_t dec;
748 SV *sv; 1530 SV *sv;
749 1531
750 if (!(flags & F_UTF8)) 1532 /* work around bugs in 5.10 where manipulating magic values
1533 * makes perl ignore the magic in subsequent accesses.
1534 * also make a copy of non-PV values, to get them into a clean
1535 * state (SvPV should do that, but it's buggy, see below).
1536 */
1537 /*SvGETMAGIC (string);*/
1538 if (SvMAGICAL (string) || !SvPOK (string))
1539 string = sv_2mortal (newSVsv (string));
1540
1541 SvUPGRADE (string, SVt_PV);
1542
1543 /* work around a bug in perl 5.10, which causes SvCUR to fail an
1544 * assertion with -DDEBUGGING, although SvCUR is documented to
1545 * return the xpv_cur field which certainly exists after upgrading.
1546 * according to nicholas clark, calling SvPOK fixes this.
1547 * But it doesn't fix it, so try another workaround, call SvPV_nolen
1548 * and hope for the best.
1549 * Damnit, SvPV_nolen still trips over yet another assertion. This
1550 * assertion business is seriously broken, try yet another workaround
1551 * for the broken -DDEBUGGING.
1552 */
1553 {
1554#ifdef DEBUGGING
1555 STRLEN offset = SvOK (string) ? sv_len (string) : 0;
1556#else
1557 STRLEN offset = SvCUR (string);
1558#endif
1559
1560 if (offset > json->max_size && json->max_size)
1561 croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
1562 (unsigned long)SvCUR (string), (unsigned long)json->max_size);
1563 }
1564
1565 if (DECODE_WANTS_OCTETS (json))
1566 sv_utf8_downgrade (string, 0);
1567 else
751 sv_utf8_upgrade (string); 1568 sv_utf8_upgrade (string);
752 1569
753 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP 1570 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
754 1571
755 dec_t dec; 1572 dec.json = *json;
756 dec.flags = flags;
757 dec.cur = SvPVX (string); 1573 dec.cur = SvPVX (string);
758 dec.end = SvEND (string); 1574 dec.end = SvEND (string);
759 dec.err = 0; 1575 dec.err = 0;
1576 dec.depth = 0;
760 1577
761 *dec.end = 1; // invalid anywhere 1578 if (dec.json.cb_object || dec.json.cb_sk_object)
1579 dec.json.flags |= F_HOOK;
1580
1581 *dec.end = 0; // this should basically be a nop, too, but make sure it's there
1582
1583 decode_ws (&dec);
762 sv = decode_sv (&dec); 1584 sv = decode_sv (&dec);
763 *dec.end = 0; 1585
1586 if (offset_return)
1587 *offset_return = dec.cur;
1588
1589 if (!(offset_return || !sv))
1590 {
1591 // check for trailing garbage
1592 decode_ws (&dec);
1593
1594 if (*dec.cur)
1595 {
1596 dec.err = "garbage after JSON object";
1597 SvREFCNT_dec (sv);
1598 sv = 0;
1599 }
1600 }
764 1601
765 if (!sv) 1602 if (!sv)
766 { 1603 {
767 IV offset = utf8_distance (dec.cur, SvPVX (string));
768 SV *uni = sv_newmortal (); 1604 SV *uni = sv_newmortal ();
769 1605
1606 // horrible hack to silence warning inside pv_uni_display
1607 COP cop = *PL_curcop;
1608 cop.cop_warnings = pWARN_NONE;
1609 ENTER;
1610 SAVEVPTR (PL_curcop);
1611 PL_curcop = &cop;
770 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ); 1612 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
1613 LEAVE;
1614
771 croak ("%s, at character %d (%s)", 1615 croak ("%s, at character offset %d (before \"%s\")",
772 dec.err, 1616 dec.err,
773 (int)offset, 1617 (int)ptr_to_index (string, dec.cur),
774 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)"); 1618 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
775 } 1619 }
776 1620
777 sv_dump (sv);//D
778 return sv_2mortal (sv); 1621 sv = sv_2mortal (sv);
1622
1623 if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
1624 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
1625
1626 return sv;
779} 1627}
1628
1629/////////////////////////////////////////////////////////////////////////////
1630// incremental parser
1631
1632static void
1633incr_parse (JSON *self)
1634{
1635 const char *p = SvPVX (self->incr_text) + self->incr_pos;
1636
1637 // the state machine here is a bit convoluted and could be simplified a lot
1638 // but this would make it slower, so...
1639
1640 for (;;)
1641 {
1642 //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
1643 switch (self->incr_mode)
1644 {
1645 // only used for initial whitespace skipping
1646 case INCR_M_WS:
1647 for (;;)
1648 {
1649 if (*p > 0x20)
1650 {
1651 if (*p == '#')
1652 {
1653 self->incr_mode = INCR_M_C0;
1654 goto incr_m_c;
1655 }
1656 else
1657 {
1658 self->incr_mode = INCR_M_JSON;
1659 goto incr_m_json;
1660 }
1661 }
1662 else if (!*p)
1663 goto interrupt;
1664
1665 ++p;
1666 }
1667
1668 // skip a single char inside a string (for \\-processing)
1669 case INCR_M_BS:
1670 if (!*p)
1671 goto interrupt;
1672
1673 ++p;
1674 self->incr_mode = INCR_M_STR;
1675 goto incr_m_str;
1676
1677 // inside #-style comments
1678 case INCR_M_C0:
1679 case INCR_M_C1:
1680 incr_m_c:
1681 for (;;)
1682 {
1683 if (*p == '\n')
1684 {
1685 self->incr_mode = self->incr_mode == INCR_M_C0 ? INCR_M_WS : INCR_M_JSON;
1686 break;
1687 }
1688 else if (!*p)
1689 goto interrupt;
1690
1691 ++p;
1692 }
1693
1694 break;
1695
1696 // inside a string
1697 case INCR_M_STR:
1698 incr_m_str:
1699 for (;;)
1700 {
1701 if (*p == '"')
1702 {
1703 ++p;
1704 self->incr_mode = INCR_M_JSON;
1705
1706 if (!self->incr_nest)
1707 goto interrupt;
1708
1709 goto incr_m_json;
1710 }
1711 else if (*p == '\\')
1712 {
1713 ++p; // "virtually" consumes character after \
1714
1715 if (!*p) // if at end of string we have to switch modes
1716 {
1717 self->incr_mode = INCR_M_BS;
1718 goto interrupt;
1719 }
1720 }
1721 else if (!*p)
1722 goto interrupt;
1723
1724 ++p;
1725 }
1726
1727 // after initial ws, outside string
1728 case INCR_M_JSON:
1729 incr_m_json:
1730 for (;;)
1731 {
1732 switch (*p++)
1733 {
1734 case 0:
1735 --p;
1736 goto interrupt;
1737
1738 case 0x09:
1739 case 0x0a:
1740 case 0x0d:
1741 case 0x20:
1742 if (!self->incr_nest)
1743 {
1744 --p; // do not eat the whitespace, let the next round do it
1745 goto interrupt;
1746 }
1747 break;
1748
1749 case '"':
1750 self->incr_mode = INCR_M_STR;
1751 goto incr_m_str;
1752
1753 case '[':
1754 case '{':
1755 if (++self->incr_nest > self->max_depth)
1756 croak (ERR_NESTING_EXCEEDED);
1757 break;
1758
1759 case ']':
1760 case '}':
1761 if (--self->incr_nest <= 0)
1762 goto interrupt;
1763 break;
1764
1765 case '#':
1766 self->incr_mode = INCR_M_C1;
1767 goto incr_m_c;
1768 }
1769 }
1770 }
1771
1772 modechange:
1773 ;
1774 }
1775
1776interrupt:
1777 self->incr_pos = p - SvPVX (self->incr_text);
1778 //printf ("interrupt<%.*s>\n", self->incr_pos, SvPVX(self->incr_text));//D
1779 //printf ("return pos %d mode %d nest %d\n", self->incr_pos, self->incr_mode, self->incr_nest);//D
1780}
1781
1782/////////////////////////////////////////////////////////////////////////////
1783// XS interface functions
780 1784
781MODULE = JSON::XS PACKAGE = JSON::XS 1785MODULE = JSON::XS PACKAGE = JSON::XS
782 1786
783BOOT: 1787BOOT:
784{ 1788{
785 int i; 1789 int i;
786 1790
787 memset (decode_hexdigit, 0xff, 256);
788 for (i = 10; i--; ) 1791 for (i = 0; i < 256; ++i)
789 decode_hexdigit ['0' + i] = i; 1792 decode_hexdigit [i] =
1793 i >= '0' && i <= '9' ? i - '0'
1794 : i >= 'a' && i <= 'f' ? i - 'a' + 10
1795 : i >= 'A' && i <= 'F' ? i - 'A' + 10
1796 : -1;
790 1797
791 for (i = 6; --i; )
792 {
793 decode_hexdigit ['a' + i] = 10 + i;
794 decode_hexdigit ['A' + i] = 10 + i;
795 }
796
797 json_stash = gv_stashpv ("JSON::XS", 1); 1798 json_stash = gv_stashpv ("JSON::XS" , 1);
798} 1799 json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
799 1800
800SV *new (char *dummy) 1801 json_true = get_bool ("JSON::XS::true");
1802 json_false = get_bool ("JSON::XS::false");
1803
1804 CvNODEBUG_on (get_cv ("JSON::XS::incr_text", 0)); /* the debugger completely breaks lvalue subs */
1805}
1806
1807PROTOTYPES: DISABLE
1808
1809void CLONE (...)
801 CODE: 1810 CODE:
802 RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash); 1811 json_stash = 0;
1812 json_boolean_stash = 0;
1813
1814void new (char *klass)
1815 PPCODE:
1816{
1817 SV *pv = NEWSV (0, sizeof (JSON));
1818 SvPOK_only (pv);
1819 json_init ((JSON *)SvPVX (pv));
1820 XPUSHs (sv_2mortal (sv_bless (
1821 newRV_noinc (pv),
1822 strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
1823 )));
1824}
1825
1826void ascii (JSON *self, int enable = 1)
1827 ALIAS:
1828 ascii = F_ASCII
1829 latin1 = F_LATIN1
1830 utf8 = F_UTF8
1831 indent = F_INDENT
1832 canonical = F_CANONICAL
1833 space_before = F_SPACE_BEFORE
1834 space_after = F_SPACE_AFTER
1835 pretty = F_PRETTY
1836 allow_nonref = F_ALLOW_NONREF
1837 shrink = F_SHRINK
1838 allow_blessed = F_ALLOW_BLESSED
1839 convert_blessed = F_CONV_BLESSED
1840 relaxed = F_RELAXED
1841 allow_unknown = F_ALLOW_UNKNOWN
1842 PPCODE:
1843{
1844 if (enable)
1845 self->flags |= ix;
1846 else
1847 self->flags &= ~ix;
1848
1849 XPUSHs (ST (0));
1850}
1851
1852void get_ascii (JSON *self)
1853 ALIAS:
1854 get_ascii = F_ASCII
1855 get_latin1 = F_LATIN1
1856 get_utf8 = F_UTF8
1857 get_indent = F_INDENT
1858 get_canonical = F_CANONICAL
1859 get_space_before = F_SPACE_BEFORE
1860 get_space_after = F_SPACE_AFTER
1861 get_allow_nonref = F_ALLOW_NONREF
1862 get_shrink = F_SHRINK
1863 get_allow_blessed = F_ALLOW_BLESSED
1864 get_convert_blessed = F_CONV_BLESSED
1865 get_relaxed = F_RELAXED
1866 get_allow_unknown = F_ALLOW_UNKNOWN
1867 PPCODE:
1868 XPUSHs (boolSV (self->flags & ix));
1869
1870void max_depth (JSON *self, U32 max_depth = 0x80000000UL)
1871 PPCODE:
1872 self->max_depth = max_depth;
1873 XPUSHs (ST (0));
1874
1875U32 get_max_depth (JSON *self)
1876 CODE:
1877 RETVAL = self->max_depth;
803 OUTPUT: 1878 OUTPUT:
804 RETVAL 1879 RETVAL
805 1880
806SV *ascii (SV *self, int enable) 1881void max_size (JSON *self, U32 max_size = 0)
807 ALIAS: 1882 PPCODE:
808 ascii = F_ASCII 1883 self->max_size = max_size;
809 utf8 = F_UTF8 1884 XPUSHs (ST (0));
810 indent = F_INDENT 1885
811 canonical = F_CANONICAL 1886int get_max_size (JSON *self)
812 space_before = F_SPACE_BEFORE
813 space_after = F_SPACE_AFTER
814 json_rpc = F_JSON_RPC
815 pretty = F_PRETTY
816 CODE: 1887 CODE:
817{ 1888 RETVAL = self->max_size;
818 UV *uv = SvJSON (self);
819 if (enable)
820 *uv |= ix;
821 else
822 *uv &= ~ix;
823
824 RETVAL = newSVsv (self);
825}
826 OUTPUT: 1889 OUTPUT:
827 RETVAL 1890 RETVAL
828 1891
829void encode (SV *self, SV *scalar) 1892void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
830 PPCODE: 1893 PPCODE:
831 XPUSHs (encode_json (scalar, *SvJSON (self))); 1894{
1895 SvREFCNT_dec (self->cb_object);
1896 self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
832 1897
833void decode (SV *self, SV *jsonstr) 1898 XPUSHs (ST (0));
1899}
1900
1901void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
834 PPCODE: 1902 PPCODE:
835 XPUSHs (decode_json (jsonstr, *SvJSON (self))); 1903{
1904 if (!self->cb_sk_object)
1905 self->cb_sk_object = newHV ();
836 1906
837void to_json (SV *scalar) 1907 if (SvOK (cb))
1908 hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
1909 else
1910 {
1911 hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
1912
1913 if (!HvKEYS (self->cb_sk_object))
1914 {
1915 SvREFCNT_dec (self->cb_sk_object);
1916 self->cb_sk_object = 0;
1917 }
1918 }
1919
1920 XPUSHs (ST (0));
1921}
1922
1923void encode (JSON *self, SV *scalar)
838 PPCODE: 1924 PPCODE:
839 XPUSHs (encode_json (scalar, F_UTF8)); 1925 PUTBACK; scalar = encode_json (scalar, self); SPAGAIN;
1926 XPUSHs (scalar);
840 1927
841void from_json (SV *jsonstr) 1928void decode (JSON *self, SV *jsonstr)
842 PPCODE: 1929 PPCODE:
843 XPUSHs (decode_json (jsonstr, F_UTF8)); 1930 PUTBACK; jsonstr = decode_json (jsonstr, self, 0); SPAGAIN;
1931 XPUSHs (jsonstr);
844 1932
1933void decode_prefix (JSON *self, SV *jsonstr)
1934 PPCODE:
1935{
1936 SV *sv;
1937 char *offset;
1938 PUTBACK; sv = decode_json (jsonstr, self, &offset); SPAGAIN;
1939 EXTEND (SP, 2);
1940 PUSHs (sv);
1941 PUSHs (sv_2mortal (newSVuv (ptr_to_index (jsonstr, offset))));
1942}
1943
1944void incr_parse (JSON *self, SV *jsonstr = 0)
1945 PPCODE:
1946{
1947 if (!self->incr_text)
1948 self->incr_text = newSVpvn ("", 0);
1949
1950 /* if utf8-ness doesn't match the decoder, need to upgrade/downgrade */
1951 if (!DECODE_WANTS_OCTETS (self) == !SvUTF8 (self->incr_text))
1952 if (DECODE_WANTS_OCTETS (self))
1953 {
1954 if (self->incr_pos)
1955 self->incr_pos = utf8_length ((U8 *)SvPVX (self->incr_text),
1956 (U8 *)SvPVX (self->incr_text) + self->incr_pos);
1957
1958 sv_utf8_downgrade (self->incr_text, 0);
1959 }
1960 else
1961 {
1962 sv_utf8_upgrade (self->incr_text);
1963
1964 if (self->incr_pos)
1965 self->incr_pos = utf8_hop ((U8 *)SvPVX (self->incr_text), self->incr_pos)
1966 - (U8 *)SvPVX (self->incr_text);
1967 }
1968
1969 // append data, if any
1970 if (jsonstr)
1971 {
1972 /* make sure both strings have same encoding */
1973 if (SvUTF8 (jsonstr) != SvUTF8 (self->incr_text))
1974 if (SvUTF8 (jsonstr))
1975 sv_utf8_downgrade (jsonstr, 0);
1976 else
1977 sv_utf8_upgrade (jsonstr);
1978
1979 /* and then just blindly append */
1980 {
1981 STRLEN len;
1982 const char *str = SvPV (jsonstr, len);
1983 STRLEN cur = SvCUR (self->incr_text);
1984
1985 if (SvLEN (self->incr_text) <= cur + len)
1986 SvGROW (self->incr_text, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
1987
1988 Move (str, SvEND (self->incr_text), len, char);
1989 SvCUR_set (self->incr_text, SvCUR (self->incr_text) + len);
1990 *SvEND (self->incr_text) = 0; // this should basically be a nop, too, but make sure it's there
1991 }
1992 }
1993
1994 if (GIMME_V != G_VOID)
1995 do
1996 {
1997 SV *sv;
1998 char *offset;
1999
2000 if (!INCR_DONE (self))
2001 {
2002 incr_parse (self);
2003
2004 if (self->incr_pos > self->max_size && self->max_size)
2005 croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
2006 (unsigned long)self->incr_pos, (unsigned long)self->max_size);
2007
2008 if (!INCR_DONE (self))
2009 {
2010 // as an optimisation, do not accumulate white space in the incr buffer
2011 if (self->incr_mode == INCR_M_WS && self->incr_pos)
2012 {
2013 self->incr_pos = 0;
2014 SvCUR_set (self->incr_text, 0);
2015 }
2016
2017 break;
2018 }
2019 }
2020
2021 PUTBACK; sv = decode_json (self->incr_text, self, &offset); SPAGAIN;
2022 XPUSHs (sv);
2023
2024 self->incr_pos -= offset - SvPVX (self->incr_text);
2025 self->incr_nest = 0;
2026 self->incr_mode = 0;
2027
2028 sv_chop (self->incr_text, offset);
2029 }
2030 while (GIMME_V == G_ARRAY);
2031}
2032
2033SV *incr_text (JSON *self)
2034 ATTRS: lvalue
2035 CODE:
2036{
2037 if (self->incr_pos)
2038 croak ("incr_text can not be called when the incremental parser already started parsing");
2039
2040 RETVAL = self->incr_text ? SvREFCNT_inc (self->incr_text) : &PL_sv_undef;
2041}
2042 OUTPUT:
2043 RETVAL
2044
2045void incr_skip (JSON *self)
2046 CODE:
2047{
2048 if (self->incr_pos)
2049 {
2050 sv_chop (self->incr_text, SvPV_nolen (self->incr_text) + self->incr_pos);
2051 self->incr_pos = 0;
2052 self->incr_nest = 0;
2053 self->incr_mode = 0;
2054 }
2055}
2056
2057void incr_reset (JSON *self)
2058 CODE:
2059{
2060 SvREFCNT_dec (self->incr_text);
2061 self->incr_text = 0;
2062 self->incr_pos = 0;
2063 self->incr_nest = 0;
2064 self->incr_mode = 0;
2065}
2066
2067void DESTROY (JSON *self)
2068 CODE:
2069 SvREFCNT_dec (self->cb_sk_object);
2070 SvREFCNT_dec (self->cb_object);
2071 SvREFCNT_dec (self->incr_text);
2072
2073PROTOTYPES: ENABLE
2074
2075void encode_json (SV *scalar)
2076 ALIAS:
2077 to_json_ = 0
2078 encode_json = F_UTF8
2079 PPCODE:
2080{
2081 JSON json;
2082 json_init (&json);
2083 json.flags |= ix;
2084 PUTBACK; scalar = encode_json (scalar, &json); SPAGAIN;
2085 XPUSHs (scalar);
2086}
2087
2088void decode_json (SV *jsonstr)
2089 ALIAS:
2090 from_json_ = 0
2091 decode_json = F_UTF8
2092 PPCODE:
2093{
2094 JSON json;
2095 json_init (&json);
2096 json.flags |= ix;
2097 PUTBACK; jsonstr = decode_json (jsonstr, &json, 0); SPAGAIN;
2098 XPUSHs (jsonstr);
2099}
2100

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