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Comparing JSON-XS/XS.xs (file contents):
Revision 1.4 by root, Thu Mar 22 21:13:58 2007 UTC vs.
Revision 1.63 by root, Mon Aug 27 01:49:01 2007 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 <float.h>
8 10
11#if defined(__BORLANDC__) || defined(_MSC_VER)
12# define snprintf _snprintf // C compilers have this in stdio.h
13#endif
14
15// some old perls do not have this, try to make it work, no
16// guarentees, though. if it breaks, you get to keep the pieces.
17#ifndef UTF8_MAXBYTES
18# define UTF8_MAXBYTES 13
19#endif
20
9#define F_ASCII 0x00000001 21#define F_ASCII 0x00000001UL
22#define F_LATIN1 0x00000002UL
10#define F_UTF8 0x00000002 23#define F_UTF8 0x00000004UL
11#define F_INDENT 0x00000004 24#define F_INDENT 0x00000008UL
12#define F_CANONICAL 0x00000008 25#define F_CANONICAL 0x00000010UL
13#define F_SPACE_BEFORE 0x00000010 26#define F_SPACE_BEFORE 0x00000020UL
14#define F_SPACE_AFTER 0x00000020 27#define F_SPACE_AFTER 0x00000040UL
15#define F_JSON_RPC 0x00000040
16#define F_ALLOW_NONREF 0x00000080 28#define F_ALLOW_NONREF 0x00000100UL
29#define F_SHRINK 0x00000200UL
30#define F_ALLOW_BLESSED 0x00000400UL
31#define F_CONV_BLESSED 0x00000800UL
32#define F_RELAXED 0x00001000UL
33
34#define F_MAXDEPTH 0xf8000000UL
35#define S_MAXDEPTH 27
36#define F_MAXSIZE 0x01f00000UL
37#define S_MAXSIZE 20
38#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
39
40#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
41#define DEC_SIZE(flags) (1UL << ((flags & F_MAXSIZE ) >> S_MAXSIZE ))
17 42
18#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER 43#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
19#define F_DEFAULT 0 44#define F_DEFAULT (9UL << S_MAXDEPTH)
20 45
21#define INIT_SIZE 32 // initial scalar size to be allocated 46#define INIT_SIZE 32 // initial scalar size to be allocated
47#define INDENT_STEP 3 // spaces per indentation level
48
49#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
22 50
23#define SB do { 51#define SB do {
24#define SE } while (0) 52#define SE } while (0)
25 53
26static HV *json_stash; 54#if __GNUC__ >= 3
55# define expect(expr,value) __builtin_expect ((expr),(value))
56# define inline inline
57#else
58# define expect(expr,value) (expr)
59# define inline static
60#endif
61
62#define expect_false(expr) expect ((expr) != 0, 0)
63#define expect_true(expr) expect ((expr) != 0, 1)
64
65#ifdef USE_ITHREADS
66# define JSON_SLOW 1
67# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
68#else
69# define JSON_SLOW 0
70# define JSON_STASH json_stash
71#endif
72
73static HV *json_stash, *json_boolean_stash; // JSON::XS::
74static SV *json_true, *json_false;
75
76typedef struct {
77 U32 flags;
78 SV *cb_object;
79 HV *cb_sk_object;
80} JSON;
81
82/////////////////////////////////////////////////////////////////////////////
83// utility functions
84
85inline void
86shrink (SV *sv)
87{
88 sv_utf8_downgrade (sv, 1);
89 if (SvLEN (sv) > SvCUR (sv) + 1)
90 {
91#ifdef SvPV_shrink_to_cur
92 SvPV_shrink_to_cur (sv);
93#elif defined (SvPV_renew)
94 SvPV_renew (sv, SvCUR (sv) + 1);
95#endif
96 }
97}
98
99// decode an utf-8 character and return it, or (UV)-1 in
100// case of an error.
101// we special-case "safe" characters from U+80 .. U+7FF,
102// but use the very good perl function to parse anything else.
103// note that we never call this function for a ascii codepoints
104inline UV
105decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
106{
107 if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
108 return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
109 else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
110 {
111 *clen = 2;
112 return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
113 }
114 else
115 {
116 *clen = (STRLEN)-1;
117 return (UV)-1;
118 }
119}
120
121/////////////////////////////////////////////////////////////////////////////
122// encoder
27 123
28// structure used for encoding JSON 124// structure used for encoding JSON
29typedef struct 125typedef struct
30{ 126{
31 char *cur; 127 char *cur; // SvPVX (sv) + current output position
32 STRLEN len; // SvLEN (sv)
33 char *end; // SvEND (sv) 128 char *end; // SvEND (sv)
34 SV *sv; 129 SV *sv; // result scalar
35 UV flags; 130 JSON json;
36 int max_recurse; 131 U32 indent; // indentation level
37 int indent; 132 U32 maxdepth; // max. indentation/recursion level
38} enc_t; 133} enc_t;
39 134
40// structure used for decoding JSON 135inline void
41typedef struct
42{
43 char *cur;
44 char *end;
45 const char *err;
46 UV flags;
47} dec_t;
48
49static UV *
50SvJSON (SV *sv)
51{
52 if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
53 croak ("object is not of type JSON::XS");
54
55 return &SvUVX (SvRV (sv));
56}
57
58/////////////////////////////////////////////////////////////////////////////
59
60static void
61need (enc_t *enc, STRLEN len) 136need (enc_t *enc, STRLEN len)
62{ 137{
63 if (enc->cur + len >= enc->end) 138 if (expect_false (enc->cur + len >= enc->end))
64 { 139 {
65 STRLEN cur = enc->cur - SvPVX (enc->sv); 140 STRLEN cur = enc->cur - SvPVX (enc->sv);
66 SvGROW (enc->sv, cur + len + 1); 141 SvGROW (enc->sv, cur + len + 1);
67 enc->cur = SvPVX (enc->sv) + cur; 142 enc->cur = SvPVX (enc->sv) + cur;
68 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv); 143 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
69 } 144 }
70} 145}
71 146
72static void 147inline void
73encode_ch (enc_t *enc, char ch) 148encode_ch (enc_t *enc, char ch)
74{ 149{
75 need (enc, 1); 150 need (enc, 1);
76 *enc->cur++ = ch; 151 *enc->cur++ = ch;
77} 152}
… …
85 160
86 while (str < end) 161 while (str < end)
87 { 162 {
88 unsigned char ch = *(unsigned char *)str; 163 unsigned char ch = *(unsigned char *)str;
89 164
90 if (ch == '"') 165 if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
91 { 166 {
167 if (expect_false (ch == '"')) // but with slow exceptions
168 {
92 need (enc, len += 1); 169 need (enc, len += 1);
93 *enc->cur++ = '\\'; 170 *enc->cur++ = '\\';
94 *enc->cur++ = '"'; 171 *enc->cur++ = '"';
95 ++str;
96 } 172 }
97 else if (ch == '\\') 173 else if (expect_false (ch == '\\'))
98 { 174 {
99 need (enc, len += 1); 175 need (enc, len += 1);
100 *enc->cur++ = '\\'; 176 *enc->cur++ = '\\';
101 *enc->cur++ = '\\'; 177 *enc->cur++ = '\\';
102 ++str;
103 } 178 }
104 else if (ch >= 0x20 && ch < 0x80) // most common case 179 else
105 {
106 *enc->cur++ = ch; 180 *enc->cur++ = ch;
107 ++str; 181
108 }
109 else if (ch == '\015')
110 {
111 need (enc, len += 1);
112 *enc->cur++ = '\\';
113 *enc->cur++ = 'r';
114 ++str;
115 }
116 else if (ch == '\012')
117 {
118 need (enc, len += 1);
119 *enc->cur++ = '\\';
120 *enc->cur++ = 'n';
121 ++str; 182 ++str;
122 } 183 }
123 else 184 else
124 { 185 {
125 STRLEN clen; 186 switch (ch)
126 UV uch;
127
128 if (is_utf8)
129 {
130 uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);
131 if (clen < 0)
132 croak ("malformed UTF-8 character in string, cannot convert to JSON");
133 } 187 {
134 else 188 case '\010': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
135 { 189 case '\011': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
136 uch = ch; 190 case '\012': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
137 clen = 1; 191 case '\014': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
138 } 192 case '\015': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
139 193
140 if (uch < 0x80 || enc->flags & F_ASCII) 194 default:
141 {
142 if (uch > 0xFFFFUL)
143 { 195 {
196 STRLEN clen;
197 UV uch;
198
199 if (is_utf8)
200 {
201 uch = decode_utf8 (str, end - str, &clen);
202 if (clen == (STRLEN)-1)
203 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
204 }
205 else
206 {
207 uch = ch;
208 clen = 1;
209 }
210
211 if (uch > 0x10FFFFUL)
212 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
213
214 if (uch < 0x80 || enc->json.flags & F_ASCII || (enc->json.flags & F_LATIN1 && uch > 0xFF))
215 {
216 if (uch > 0xFFFFUL)
217 {
144 need (enc, len += 11); 218 need (enc, len += 11);
145 sprintf (enc->cur, "\\u%04x\\u%04x", 219 sprintf (enc->cur, "\\u%04x\\u%04x",
146 (uch - 0x10000) / 0x400 + 0xD800, 220 (int)((uch - 0x10000) / 0x400 + 0xD800),
147 (uch - 0x10000) % 0x400 + 0xDC00); 221 (int)((uch - 0x10000) % 0x400 + 0xDC00));
148 enc->cur += 12; 222 enc->cur += 12;
223 }
224 else
225 {
226 static char hexdigit [16] = "0123456789abcdef";
227 need (enc, len += 5);
228 *enc->cur++ = '\\';
229 *enc->cur++ = 'u';
230 *enc->cur++ = hexdigit [ uch >> 12 ];
231 *enc->cur++ = hexdigit [(uch >> 8) & 15];
232 *enc->cur++ = hexdigit [(uch >> 4) & 15];
233 *enc->cur++ = hexdigit [(uch >> 0) & 15];
234 }
235
236 str += clen;
237 }
238 else if (enc->json.flags & F_LATIN1)
239 {
240 *enc->cur++ = uch;
241 str += clen;
242 }
243 else if (is_utf8)
244 {
245 need (enc, len += clen);
246 do
247 {
248 *enc->cur++ = *str++;
249 }
250 while (--clen);
251 }
252 else
253 {
254 need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
255 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
256 ++str;
257 }
149 } 258 }
150 else
151 {
152 static char hexdigit [16] = "0123456789abcdef";
153 need (enc, len += 5);
154 *enc->cur++ = '\\';
155 *enc->cur++ = 'u';
156 *enc->cur++ = hexdigit [ uch >> 12 ];
157 *enc->cur++ = hexdigit [(uch >> 8) & 15];
158 *enc->cur++ = hexdigit [(uch >> 4) & 15];
159 *enc->cur++ = hexdigit [(uch >> 0) & 15];
160 }
161
162 str += clen;
163 }
164 else if (is_utf8)
165 {
166 need (enc, len += clen);
167 while (clen--)
168 *enc->cur++ = *str++;
169 }
170 else
171 {
172 need (enc, 10); // never more than 11 bytes needed
173 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
174 ++str;
175 } 259 }
176 } 260 }
177 261
178 --len; 262 --len;
179 } 263 }
180} 264}
181 265
182#define INDENT SB \ 266inline void
267encode_indent (enc_t *enc)
268{
183 if (enc->flags & F_INDENT) \ 269 if (enc->json.flags & F_INDENT)
184 { \ 270 {
185 int i_; \ 271 int spaces = enc->indent * INDENT_STEP;
186 need (enc, enc->indent); \ 272
187 for (i_ = enc->indent * 3; i_--; )\ 273 need (enc, spaces);
274 memset (enc->cur, ' ', spaces);
275 enc->cur += spaces;
276 }
277}
278
279inline void
280encode_space (enc_t *enc)
281{
282 need (enc, 1);
283 encode_ch (enc, ' ');
284}
285
286inline void
287encode_nl (enc_t *enc)
288{
289 if (enc->json.flags & F_INDENT)
290 {
291 need (enc, 1);
188 encode_ch (enc, ' '); \ 292 encode_ch (enc, '\n');
189 } \ 293 }
190 SE 294}
191 295
192#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE 296inline void
193#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE 297encode_comma (enc_t *enc)
194#define COMMA SB \ 298{
195 encode_ch (enc, ','); \ 299 encode_ch (enc, ',');
300
196 if (enc->flags & F_INDENT) \ 301 if (enc->json.flags & F_INDENT)
197 NL; \ 302 encode_nl (enc);
198 else if (enc->flags & F_SPACE_AFTER) \ 303 else if (enc->json.flags & F_SPACE_AFTER)
199 SPACE; \ 304 encode_space (enc);
200 SE 305}
201 306
202static void encode_sv (enc_t *enc, SV *sv); 307static void encode_sv (enc_t *enc, SV *sv);
203 308
204static void 309static void
205encode_av (enc_t *enc, AV *av) 310encode_av (enc_t *enc, AV *av)
206{ 311{
207 int i, len = av_len (av); 312 int i, len = av_len (av);
208 313
209 encode_ch (enc, '['); NL; 314 if (enc->indent >= enc->maxdepth)
315 croak ("data structure too deep (hit recursion limit)");
316
317 encode_ch (enc, '['); encode_nl (enc);
210 ++enc->indent; 318 ++enc->indent;
211 319
212 for (i = 0; i <= len; ++i) 320 for (i = 0; i <= len; ++i)
213 { 321 {
214 INDENT; 322 SV **svp = av_fetch (av, i, 0);
215 encode_sv (enc, *av_fetch (av, i, 0)); 323
324 encode_indent (enc);
325
326 if (svp)
327 encode_sv (enc, *svp);
328 else
329 encode_str (enc, "null", 4, 0);
216 330
217 if (i < len) 331 if (i < len)
218 COMMA; 332 encode_comma (enc);
219 } 333 }
220 334
221 NL; 335 encode_nl (enc);
222 336
223 --enc->indent; 337 --enc->indent;
224 INDENT; encode_ch (enc, ']'); 338 encode_indent (enc); encode_ch (enc, ']');
225} 339}
226 340
227static void 341static void
228encode_he (enc_t *enc, HE *he) 342encode_hk (enc_t *enc, HE *he)
229{ 343{
230 encode_ch (enc, '"'); 344 encode_ch (enc, '"');
231 345
232 if (HeKLEN (he) == HEf_SVKEY) 346 if (HeKLEN (he) == HEf_SVKEY)
233 { 347 {
… …
243 else 357 else
244 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he)); 358 encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
245 359
246 encode_ch (enc, '"'); 360 encode_ch (enc, '"');
247 361
248 if (enc->flags & F_SPACE_BEFORE) SPACE; 362 if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
249 encode_ch (enc, ':'); 363 encode_ch (enc, ':');
250 if (enc->flags & F_SPACE_AFTER ) SPACE; 364 if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
251 encode_sv (enc, HeVAL (he));
252} 365}
253 366
254// compare hash entries, used when all keys are bytestrings 367// compare hash entries, used when all keys are bytestrings
255static int 368static int
256he_cmp_fast (const void *a_, const void *b_) 369he_cmp_fast (const void *a_, const void *b_)
… …
261 HE *b = *(HE **)b_; 374 HE *b = *(HE **)b_;
262 375
263 STRLEN la = HeKLEN (a); 376 STRLEN la = HeKLEN (a);
264 STRLEN lb = HeKLEN (b); 377 STRLEN lb = HeKLEN (b);
265 378
266 if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb))) 379 if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
267 cmp = la < lb ? -1 : la == lb ? 0 : 1; 380 cmp = lb - la;
268 381
269 return cmp; 382 return cmp;
270} 383}
271 384
272// compare hash entries, used when some keys are sv's or utf-x 385// compare hash entries, used when some keys are sv's or utf-x
273static int 386static int
274he_cmp_slow (const void *a, const void *b) 387he_cmp_slow (const void *a, const void *b)
275{ 388{
276 return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b)); 389 return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
277} 390}
278 391
279static void 392static void
280encode_hv (enc_t *enc, HV *hv) 393encode_hv (enc_t *enc, HV *hv)
281{ 394{
395 HE *he;
282 int count, i; 396 int count;
283 397
398 if (enc->indent >= enc->maxdepth)
399 croak ("data structure too deep (hit recursion limit)");
400
284 encode_ch (enc, '{'); NL; ++enc->indent; 401 encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
285 402
286 if ((count = hv_iterinit (hv)))
287 {
288 // for canonical output we have to sort by keys first 403 // for canonical output we have to sort by keys first
289 // actually, this is mostly due to the stupid so-called 404 // actually, this is mostly due to the stupid so-called
290 // security workaround added somewhere in 5.8.x. 405 // security workaround added somewhere in 5.8.x.
291 // that randomises hash orderings 406 // that randomises hash orderings
292 if (enc->flags & F_CANONICAL) 407 if (enc->json.flags & F_CANONICAL)
408 {
409 int count = hv_iterinit (hv);
410
411 if (SvMAGICAL (hv))
293 { 412 {
294 HE *he, *hes [count]; 413 // need to count by iterating. could improve by dynamically building the vector below
414 // but I don't care for the speed of this special case.
415 // note also that we will run into undefined behaviour when the two iterations
416 // do not result in the same count, something I might care for in some later release.
417
418 count = 0;
419 while (hv_iternext (hv))
420 ++count;
421
422 hv_iterinit (hv);
423 }
424
425 if (count)
426 {
295 int fast = 1; 427 int i, fast = 1;
428#if defined(__BORLANDC__) || defined(_MSC_VER)
429 HE **hes = _alloca (count * sizeof (HE));
430#else
431 HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
432#endif
296 433
297 i = 0; 434 i = 0;
298 while ((he = hv_iternext (hv))) 435 while ((he = hv_iternext (hv)))
299 { 436 {
300 hes [i++] = he; 437 hes [i++] = he;
… …
306 443
307 if (fast) 444 if (fast)
308 qsort (hes, count, sizeof (HE *), he_cmp_fast); 445 qsort (hes, count, sizeof (HE *), he_cmp_fast);
309 else 446 else
310 { 447 {
311 // hack to disable "use bytes" 448 // hack to forcefully disable "use bytes"
312 COP *oldcop = PL_curcop, cop; 449 COP cop = *PL_curcop;
313 cop.op_private = 0; 450 cop.op_private = 0;
451
452 ENTER;
453 SAVETMPS;
454
455 SAVEVPTR (PL_curcop);
314 PL_curcop = &cop; 456 PL_curcop = &cop;
315 457
316 SAVETMPS;
317 qsort (hes, count, sizeof (HE *), he_cmp_slow); 458 qsort (hes, count, sizeof (HE *), he_cmp_slow);
459
318 FREETMPS; 460 FREETMPS;
319 461 LEAVE;
320 PL_curcop = oldcop;
321 }
322
323 for (i = 0; i < count; ++i)
324 { 462 }
325 INDENT;
326 encode_he (enc, hes [i]);
327 463
328 if (i < count - 1) 464 while (count--)
329 COMMA;
330 } 465 {
466 encode_indent (enc);
467 he = hes [count];
468 encode_hk (enc, he);
469 encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
331 470
471 if (count)
472 encode_comma (enc);
332 NL; 473 }
474 }
475 }
476 else
477 {
478 if (hv_iterinit (hv) || SvMAGICAL (hv))
479 if ((he = hv_iternext (hv)))
480 for (;;)
481 {
482 encode_indent (enc);
483 encode_hk (enc, he);
484 encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
485
486 if (!(he = hv_iternext (hv)))
487 break;
488
489 encode_comma (enc);
490 }
491 }
492
493 encode_nl (enc);
494
495 --enc->indent; encode_indent (enc); encode_ch (enc, '}');
496}
497
498// encode objects, arrays and special \0=false and \1=true values.
499static void
500encode_rv (enc_t *enc, SV *sv)
501{
502 svtype svt;
503
504 SvGETMAGIC (sv);
505 svt = SvTYPE (sv);
506
507 if (expect_false (SvOBJECT (sv)))
508 {
509 HV *stash = !JSON_SLOW || json_boolean_stash
510 ? json_boolean_stash
511 : gv_stashpv ("JSON::XS::Boolean", 1);
512
513 if (SvSTASH (sv) == stash)
514 {
515 if (SvIV (sv))
516 encode_str (enc, "true", 4, 0);
517 else
518 encode_str (enc, "false", 5, 0);
333 } 519 }
334 else 520 else
335 { 521 {
336 SV *sv; 522#if 0
337 HE *he = hv_iternext (hv); 523 if (0 && sv_derived_from (rv, "JSON::Literal"))
338
339 for (;;)
340 {
341 INDENT;
342 encode_he (enc, he);
343
344 if (!(he = hv_iternext (hv)))
345 break;
346
347 COMMA;
348 } 524 {
349 525 // not yet
350 NL; 526 }
527#endif
528 if (enc->json.flags & F_CONV_BLESSED)
529 {
530 // we re-bless the reference to get overload and other niceties right
531 GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
532
533 if (to_json)
534 {
535 dSP;
536
537 ENTER; SAVETMPS; PUSHMARK (SP);
538 XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
539
540 // calling with G_SCALAR ensures that we always get a 1 return value
541 PUTBACK;
542 call_sv ((SV *)GvCV (to_json), G_SCALAR);
543 SPAGAIN;
544
545 // catch this surprisingly common error
546 if (SvROK (TOPs) && SvRV (TOPs) == sv)
547 croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
548
549 sv = POPs;
550 PUTBACK;
551
552 encode_sv (enc, sv);
553
554 FREETMPS; LEAVE;
555 }
556 else if (enc->json.flags & F_ALLOW_BLESSED)
557 encode_str (enc, "null", 4, 0);
558 else
559 croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
560 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
561 }
562 else if (enc->json.flags & F_ALLOW_BLESSED)
563 encode_str (enc, "null", 4, 0);
564 else
565 croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
566 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
351 } 567 }
352 } 568 }
569 else if (svt == SVt_PVHV)
570 encode_hv (enc, (HV *)sv);
571 else if (svt == SVt_PVAV)
572 encode_av (enc, (AV *)sv);
573 else if (svt < SVt_PVAV)
574 {
575 STRLEN len = 0;
576 char *pv = svt ? SvPV (sv, len) : 0;
353 577
354 --enc->indent; INDENT; encode_ch (enc, '}'); 578 if (len == 1 && *pv == '1')
579 encode_str (enc, "true", 4, 0);
580 else if (len == 1 && *pv == '0')
581 encode_str (enc, "false", 5, 0);
582 else
583 croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
584 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
585 }
586 else
587 croak ("encountered %s, but JSON can only represent references to arrays or hashes",
588 SvPV_nolen (sv_2mortal (newRV_inc (sv))));
355} 589}
356 590
357static void 591static void
358encode_sv (enc_t *enc, SV *sv) 592encode_sv (enc_t *enc, SV *sv)
359{ 593{
… …
367 encode_str (enc, str, len, SvUTF8 (sv)); 601 encode_str (enc, str, len, SvUTF8 (sv));
368 encode_ch (enc, '"'); 602 encode_ch (enc, '"');
369 } 603 }
370 else if (SvNOKp (sv)) 604 else if (SvNOKp (sv))
371 { 605 {
606 // trust that perl will do the right thing w.r.t. JSON syntax.
372 need (enc, NV_DIG + 32); 607 need (enc, NV_DIG + 32);
373 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 608 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
374 enc->cur += strlen (enc->cur); 609 enc->cur += strlen (enc->cur);
375 } 610 }
376 else if (SvIOKp (sv)) 611 else if (SvIOKp (sv))
377 { 612 {
378 need (enc, 64); 613 // we assume we can always read an IV as a UV
614 if (SvUV (sv) & ~(UV)0x7fff)
615 {
616 // large integer, use the (rather slow) snprintf way.
617 need (enc, sizeof (UV) * 3);
379 enc->cur += 618 enc->cur +=
380 SvIsUV(sv) 619 SvIsUV(sv)
381 ? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv)) 620 ? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
382 : snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv)); 621 : snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
622 }
623 else
624 {
625 // optimise the "small number case"
626 // code will likely be branchless and use only a single multiplication
627 I32 i = SvIV (sv);
628 U32 u;
629 char digit, nz = 0;
630
631 need (enc, 6);
632
633 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
634 u = i < 0 ? -i : i;
635
636 // convert to 4.28 fixed-point representation
637 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
638
639 // now output digit by digit, each time masking out the integer part
640 // and multiplying by 5 while moving the decimal point one to the right,
641 // resulting in a net multiplication by 10.
642 // we always write the digit to memory but conditionally increment
643 // the pointer, to ease the usage of conditional move instructions.
644 digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
645 digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
646 digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
647 digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
648 digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
649 }
383 } 650 }
384 else if (SvROK (sv)) 651 else if (SvROK (sv))
385 { 652 encode_rv (enc, SvRV (sv));
386 if (!--enc->max_recurse)
387 croak ("data structure too deep (hit recursion limit)");
388
389 sv = SvRV (sv);
390
391 switch (SvTYPE (sv))
392 {
393 case SVt_PVAV: encode_av (enc, (AV *)sv); break;
394 case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
395
396 default:
397 croak ("JSON can only represent references to arrays or hashes");
398 }
399 }
400 else if (!SvOK (sv)) 653 else if (!SvOK (sv))
401 encode_str (enc, "null", 4, 0); 654 encode_str (enc, "null", 4, 0);
402 else 655 else
403 croak ("encountered perl type that JSON cannot handle"); 656 croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
657 SvPV_nolen (sv), SvFLAGS (sv));
404} 658}
405 659
406static SV * 660static SV *
407encode_json (SV *scalar, UV flags) 661encode_json (SV *scalar, JSON *json)
408{ 662{
409 if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))
410 croak ("hash- or arraref required (not a simple scalar, use allow_nonref to allow this)");
411
412 enc_t enc; 663 enc_t enc;
413 enc.flags = flags; 664
665 if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
666 croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
667
668 enc.json = *json;
414 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE)); 669 enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
415 enc.cur = SvPVX (enc.sv); 670 enc.cur = SvPVX (enc.sv);
416 enc.end = SvEND (enc.sv); 671 enc.end = SvEND (enc.sv);
417 enc.max_recurse = 0;
418 enc.indent = 0; 672 enc.indent = 0;
673 enc.maxdepth = DEC_DEPTH (enc.json.flags);
419 674
420 SvPOK_only (enc.sv); 675 SvPOK_only (enc.sv);
421 encode_sv (&enc, scalar); 676 encode_sv (&enc, scalar);
422 677
678 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
679 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
680
423 if (!(flags & (F_ASCII | F_UTF8))) 681 if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
424 SvUTF8_on (enc.sv); 682 SvUTF8_on (enc.sv);
425 683
426 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv)); 684 if (enc.json.flags & F_SHRINK)
685 shrink (enc.sv);
686
427 return enc.sv; 687 return enc.sv;
428} 688}
429 689
430///////////////////////////////////////////////////////////////////////////// 690/////////////////////////////////////////////////////////////////////////////
691// decoder
431 692
432#define WS \ 693// structure used for decoding JSON
694typedef struct
695{
696 char *cur; // current parser pointer
697 char *end; // end of input string
698 const char *err; // parse error, if != 0
699 JSON json;
700 U32 depth; // recursion depth
701 U32 maxdepth; // recursion depth limit
702} dec_t;
703
704inline void
705decode_ws (dec_t *dec)
706{
433 for (;;) \ 707 for (;;)
434 { \ 708 {
435 char ch = *dec->cur; \ 709 char ch = *dec->cur;
710
436 if (ch > 0x20 \ 711 if (ch > 0x20
437 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \ 712 || (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
438 break; \ 713 break;
714
715 if (ch == '#' && dec->json.flags & F_RELAXED)
716 ++dec->cur;
717
439 ++dec->cur; \ 718 ++dec->cur;
440 } 719 }
720}
441 721
442#define ERR(reason) SB dec->err = reason; goto fail; SE 722#define ERR(reason) SB dec->err = reason; goto fail; SE
723
443#define EXPECT_CH(ch) SB \ 724#define EXPECT_CH(ch) SB \
444 if (*dec->cur != ch) \ 725 if (*dec->cur != ch) \
445 ERR (# ch " expected"); \ 726 ERR (# ch " expected"); \
446 ++dec->cur; \ 727 ++dec->cur; \
447 SE 728 SE
448 729
730#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
731#define DEC_DEC_DEPTH --dec->depth
732
449static SV *decode_sv (dec_t *dec); 733static SV *decode_sv (dec_t *dec);
450 734
451static signed char decode_hexdigit[256]; 735static signed char decode_hexdigit[256];
452 736
453static UV 737static UV
454decode_4hex (dec_t *dec) 738decode_4hex (dec_t *dec)
455{ 739{
456 signed char d1, d2, d3, d4; 740 signed char d1, d2, d3, d4;
741 unsigned char *cur = (unsigned char *)dec->cur;
457 742
458 d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]]; 743 d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
459 if (d1 < 0) ERR ("four hexadecimal digits expected"); 744 d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
460 d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]]; 745 d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
461 if (d2 < 0) ERR ("four hexadecimal digits expected"); 746 d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
462 d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
463 if (d3 < 0) ERR ("four hexadecimal digits expected");
464 d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
465 if (d4 < 0) ERR ("four hexadecimal digits expected");
466 747
467 dec->cur += 4; 748 dec->cur += 4;
468 749
469 return ((UV)d1) << 12 750 return ((UV)d1) << 12
470 | ((UV)d2) << 8 751 | ((UV)d2) << 8
… …
473 754
474fail: 755fail:
475 return (UV)-1; 756 return (UV)-1;
476} 757}
477 758
478#define APPEND_GROW(n) SB \
479 if (cur + (n) >= end) \
480 { \
481 STRLEN ofs = cur - SvPVX (sv); \
482 SvGROW (sv, ofs + (n) + 1); \
483 cur = SvPVX (sv) + ofs; \
484 end = SvEND (sv); \
485 } \
486 SE
487
488#define APPEND_CH(ch) SB \
489 APPEND_GROW (1); \
490 *cur++ = (ch); \
491 SE
492
493static SV * 759static SV *
494decode_str (dec_t *dec) 760decode_str (dec_t *dec)
495{ 761{
496 SV *sv = NEWSV (0,2); 762 SV *sv = 0;
497 int utf8 = 0; 763 int utf8 = 0;
498 char *cur = SvPVX (sv); 764 char *dec_cur = dec->cur;
499 char *end = SvEND (sv);
500 765
501 for (;;) 766 do
502 { 767 {
503 unsigned char ch = *(unsigned char *)dec->cur; 768 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
769 char *cur = buf;
504 770
505 if (ch == '"') 771 do
506 break;
507 else if (ch == '\\')
508 { 772 {
509 switch (*++dec->cur) 773 unsigned char ch = *(unsigned char *)dec_cur++;
774
775 if (expect_false (ch == '"'))
776 {
777 --dec_cur;
778 break;
510 { 779 }
511 case '\\': 780 else if (expect_false (ch == '\\'))
512 case '/': 781 {
513 case '"': APPEND_CH (*dec->cur++); break; 782 switch (*dec_cur)
514
515 case 'b': APPEND_CH ('\010'); ++dec->cur; break;
516 case 't': APPEND_CH ('\011'); ++dec->cur; break;
517 case 'n': APPEND_CH ('\012'); ++dec->cur; break;
518 case 'f': APPEND_CH ('\014'); ++dec->cur; break;
519 case 'r': APPEND_CH ('\015'); ++dec->cur; break;
520
521 case 'u':
522 { 783 {
523 UV lo, hi; 784 case '\\':
524 ++dec->cur; 785 case '/':
786 case '"': *cur++ = *dec_cur++; break;
525 787
526 hi = decode_4hex (dec); 788 case 'b': ++dec_cur; *cur++ = '\010'; break;
527 if (hi == (UV)-1) 789 case 't': ++dec_cur; *cur++ = '\011'; break;
528 goto fail; 790 case 'n': ++dec_cur; *cur++ = '\012'; break;
791 case 'f': ++dec_cur; *cur++ = '\014'; break;
792 case 'r': ++dec_cur; *cur++ = '\015'; break;
529 793
530 // possibly a surrogate pair 794 case 'u':
531 if (hi >= 0xd800 && hi < 0xdc00)
532 { 795 {
533 if (dec->cur [0] != '\\' || dec->cur [1] != 'u') 796 UV lo, hi;
534 ERR ("illegal surrogate character"); 797 ++dec_cur;
535 798
536 dec->cur += 2; 799 dec->cur = dec_cur;
537
538 lo = decode_4hex (dec); 800 hi = decode_4hex (dec);
801 dec_cur = dec->cur;
539 if (lo == (UV)-1) 802 if (hi == (UV)-1)
540 goto fail; 803 goto fail;
541 804
805 // possibly a surrogate pair
806 if (hi >= 0xd800)
807 if (hi < 0xdc00)
808 {
809 if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
810 ERR ("missing low surrogate character in surrogate pair");
811
812 dec_cur += 2;
813
814 dec->cur = dec_cur;
815 lo = decode_4hex (dec);
816 dec_cur = dec->cur;
817 if (lo == (UV)-1)
818 goto fail;
819
542 if (lo < 0xdc00 || lo >= 0xe000) 820 if (lo < 0xdc00 || lo >= 0xe000)
543 ERR ("surrogate pair expected"); 821 ERR ("surrogate pair expected");
544 822
545 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000; 823 hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
824 }
825 else if (hi < 0xe000)
826 ERR ("missing high surrogate character in surrogate pair");
827
828 if (hi >= 0x80)
829 {
830 utf8 = 1;
831
832 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
833 }
834 else
835 *cur++ = hi;
546 } 836 }
547 else if (lo >= 0xdc00 && lo < 0xe000)
548 ERR ("illegal surrogate character");
549
550 if (hi >= 0x80)
551 { 837 break;
552 utf8 = 1;
553 838
554 APPEND_GROW (4); // at most 4 bytes for 21 bits
555 cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
556 }
557 else 839 default:
558 APPEND_CH (hi); 840 --dec_cur;
841 ERR ("illegal backslash escape sequence in string");
559 } 842 }
843 }
844 else if (expect_true (ch >= 0x20 && ch <= 0x7f))
845 *cur++ = ch;
846 else if (ch >= 0x80)
847 {
848 STRLEN clen;
849 UV uch;
850
851 --dec_cur;
852
853 uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
854 if (clen == (STRLEN)-1)
855 ERR ("malformed UTF-8 character in JSON string");
856
857 do
858 *cur++ = *dec_cur++;
859 while (--clen);
860
861 utf8 = 1;
862 }
863 else
864 {
865 --dec_cur;
866
867 if (!ch)
868 ERR ("unexpected end of string while parsing JSON string");
560 break; 869 else
870 ERR ("invalid character encountered while parsing JSON string");
561 } 871 }
562 } 872 }
563 else if (ch >= 0x20 && ch <= 0x7f) 873 while (cur < buf + SHORT_STRING_LEN);
564 APPEND_CH (*dec->cur++); 874
565 else if (ch >= 0x80) 875 {
876 STRLEN len = cur - buf;
877
878 if (sv)
566 { 879 {
567 STRLEN clen; 880 SvGROW (sv, SvCUR (sv) + len + 1);
568 UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY); 881 memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
569 if (clen < 0) 882 SvCUR_set (sv, SvCUR (sv) + len);
570 ERR ("malformed UTF-8 character in string, cannot convert to JSON");
571
572 APPEND_GROW (clen);
573 memcpy (cur, dec->cur, clen);
574 cur += clen;
575 dec->cur += clen;
576 } 883 }
577 else 884 else
578 ERR ("invalid character encountered"); 885 sv = newSVpvn (buf, len);
579 } 886 }
887 }
888 while (*dec_cur != '"');
580 889
581 ++dec->cur; 890 ++dec_cur;
582 891
583 SvCUR_set (sv, cur - SvPVX (sv)); 892 if (sv)
584 893 {
585 SvPOK_only (sv); 894 SvPOK_only (sv);
586 *SvEND (sv) = 0; 895 *SvEND (sv) = 0;
587 896
588 if (utf8) 897 if (utf8)
589 SvUTF8_on (sv); 898 SvUTF8_on (sv);
899 }
900 else
901 sv = newSVpvn ("", 0);
590 902
903 dec->cur = dec_cur;
591 return sv; 904 return sv;
592 905
593fail: 906fail:
594 SvREFCNT_dec (sv); 907 dec->cur = dec_cur;
595 return 0; 908 return 0;
596} 909}
597 910
598static SV * 911static SV *
599decode_num (dec_t *dec) 912decode_num (dec_t *dec)
… …
609 { 922 {
610 ++dec->cur; 923 ++dec->cur;
611 if (*dec->cur >= '0' && *dec->cur <= '9') 924 if (*dec->cur >= '0' && *dec->cur <= '9')
612 ERR ("malformed number (leading zero must not be followed by another digit)"); 925 ERR ("malformed number (leading zero must not be followed by another digit)");
613 } 926 }
614 927 else if (*dec->cur < '0' || *dec->cur > '9')
615 // int 928 ERR ("malformed number (no digits after initial minus)");
929 else
930 do
931 {
932 ++dec->cur;
933 }
616 while (*dec->cur >= '0' && *dec->cur <= '9') 934 while (*dec->cur >= '0' && *dec->cur <= '9');
617 ++dec->cur;
618 935
619 // [frac] 936 // [frac]
620 if (*dec->cur == '.') 937 if (*dec->cur == '.')
621 { 938 {
622 is_nv = 1; 939 ++dec->cur;
940
941 if (*dec->cur < '0' || *dec->cur > '9')
942 ERR ("malformed number (no digits after decimal point)");
623 943
624 do 944 do
625 { 945 {
626 ++dec->cur; 946 ++dec->cur;
627 } 947 }
628 while (*dec->cur >= '0' && *dec->cur <= '9'); 948 while (*dec->cur >= '0' && *dec->cur <= '9');
949
950 is_nv = 1;
629 } 951 }
630 952
631 // [exp] 953 // [exp]
632 if (*dec->cur == 'e' || *dec->cur == 'E') 954 if (*dec->cur == 'e' || *dec->cur == 'E')
633 { 955 {
634 is_nv = 1;
635
636 ++dec->cur; 956 ++dec->cur;
957
637 if (*dec->cur == '-' || *dec->cur == '+') 958 if (*dec->cur == '-' || *dec->cur == '+')
638 ++dec->cur; 959 ++dec->cur;
639 960
961 if (*dec->cur < '0' || *dec->cur > '9')
962 ERR ("malformed number (no digits after exp sign)");
963
964 do
965 {
966 ++dec->cur;
967 }
640 while (*dec->cur >= '0' && *dec->cur <= '9') 968 while (*dec->cur >= '0' && *dec->cur <= '9');
641 ++dec->cur; 969
970 is_nv = 1;
642 } 971 }
643 972
644 if (!is_nv) 973 if (!is_nv)
645 { 974 {
646 UV uv; 975 int len = dec->cur - start;
647 int numtype = grok_number (start, dec->cur - start, &uv); 976
648 if (numtype & IS_NUMBER_IN_UV) 977 // special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
649 if (numtype & IS_NUMBER_NEG) 978 if (*start == '-')
979 switch (len)
650 { 980 {
651 if (uv < (UV)IV_MIN) 981 case 2: return newSViv (-( start [1] - '0' * 1));
652 return newSViv (-(IV)uv); 982 case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
983 case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
984 case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
653 } 985 }
986 else
987 switch (len)
988 {
989 case 1: return newSViv ( start [0] - '0' * 1);
990 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
991 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
992 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
993 }
994
995 {
996 UV uv;
997 int numtype = grok_number (start, len, &uv);
998 if (numtype & IS_NUMBER_IN_UV)
999 if (numtype & IS_NUMBER_NEG)
1000 {
1001 if (uv < (UV)IV_MIN)
1002 return newSViv (-(IV)uv);
1003 }
654 else 1004 else
655 return newSVuv (uv); 1005 return newSVuv (uv);
656 } 1006 }
657 1007
1008 len -= *start == '-' ? 1 : 0;
1009
1010 // does not fit into IV or UV, try NV
1011 if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len)
1012 #if defined (LDBL_DIG)
1013 || (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len)
1014 #endif
1015 )
1016 // fits into NV without loss of precision
1017 return newSVnv (Atof (start));
1018
1019 // everything else fails, convert it to a string
1020 return newSVpvn (start, dec->cur - start);
1021 }
1022
1023 // loss of precision here
658 return newSVnv (Atof (start)); 1024 return newSVnv (Atof (start));
659 1025
660fail: 1026fail:
661 return 0; 1027 return 0;
662} 1028}
… …
664static SV * 1030static SV *
665decode_av (dec_t *dec) 1031decode_av (dec_t *dec)
666{ 1032{
667 AV *av = newAV (); 1033 AV *av = newAV ();
668 1034
1035 DEC_INC_DEPTH;
1036 decode_ws (dec);
1037
1038 if (*dec->cur == ']')
1039 ++dec->cur;
1040 else
669 for (;;) 1041 for (;;)
670 { 1042 {
671 SV *value; 1043 SV *value;
672 1044
673 value = decode_sv (dec); 1045 value = decode_sv (dec);
674 if (!value) 1046 if (!value)
675 goto fail; 1047 goto fail;
676 1048
677 av_push (av, value); 1049 av_push (av, value);
678 1050
679 WS; 1051 decode_ws (dec);
680 1052
681 if (*dec->cur == ']') 1053 if (*dec->cur == ']')
682 { 1054 {
683 ++dec->cur; 1055 ++dec->cur;
684 break; 1056 break;
1057 }
685 } 1058
686
687 if (*dec->cur != ',') 1059 if (*dec->cur != ',')
688 ERR (", or ] expected while parsing array"); 1060 ERR (", or ] expected while parsing array");
689 1061
690 ++dec->cur; 1062 ++dec->cur;
1063
1064 decode_ws (dec);
1065
1066 if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
1067 {
1068 ++dec->cur;
1069 break;
1070 }
691 } 1071 }
692 1072
1073 DEC_DEC_DEPTH;
693 return newRV_noinc ((SV *)av); 1074 return newRV_noinc ((SV *)av);
694 1075
695fail: 1076fail:
696 SvREFCNT_dec (av); 1077 SvREFCNT_dec (av);
1078 DEC_DEC_DEPTH;
697 return 0; 1079 return 0;
698} 1080}
699 1081
700static SV * 1082static SV *
701decode_hv (dec_t *dec) 1083decode_hv (dec_t *dec)
702{ 1084{
1085 SV *sv;
703 HV *hv = newHV (); 1086 HV *hv = newHV ();
704 1087
1088 DEC_INC_DEPTH;
1089 decode_ws (dec);
1090
1091 if (*dec->cur == '}')
1092 ++dec->cur;
1093 else
705 for (;;) 1094 for (;;)
706 { 1095 {
707 SV *key, *value;
708
709 WS; EXPECT_CH ('"'); 1096 EXPECT_CH ('"');
710 1097
711 key = decode_str (dec); 1098 // heuristic: assume that
712 if (!key) 1099 // a) decode_str + hv_store_ent are abysmally slow.
713 goto fail; 1100 // b) most hash keys are short, simple ascii text.
714 1101 // => try to "fast-match" such strings to avoid
715 WS; EXPECT_CH (':'); 1102 // the overhead of decode_str + hv_store_ent.
716
717 value = decode_sv (dec);
718 if (!value)
719 { 1103 {
1104 SV *value;
1105 char *p = dec->cur;
1106 char *e = p + 24; // only try up to 24 bytes
1107
1108 for (;;)
1109 {
1110 // the >= 0x80 is true on most architectures
1111 if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
1112 {
1113 // slow path, back up and use decode_str
1114 SV *key = decode_str (dec);
1115 if (!key)
1116 goto fail;
1117
1118 decode_ws (dec); EXPECT_CH (':');
1119
1120 decode_ws (dec);
1121 value = decode_sv (dec);
1122 if (!value)
1123 {
1124 SvREFCNT_dec (key);
1125 goto fail;
1126 }
1127
1128 hv_store_ent (hv, key, value, 0);
720 SvREFCNT_dec (key); 1129 SvREFCNT_dec (key);
1130
1131 break;
1132 }
1133 else if (*p == '"')
1134 {
1135 // fast path, got a simple key
1136 char *key = dec->cur;
1137 int len = p - key;
1138 dec->cur = p + 1;
1139
1140 decode_ws (dec); EXPECT_CH (':');
1141
1142 decode_ws (dec);
1143 value = decode_sv (dec);
1144 if (!value)
721 goto fail; 1145 goto fail;
1146
1147 hv_store (hv, key, len, value, 0);
1148
1149 break;
1150 }
1151
1152 ++p;
1153 }
722 } 1154 }
723 1155
724 //TODO: optimise 1156 decode_ws (dec);
725 hv_store_ent (hv, key, value, 0);
726 1157
727 WS;
728
729 if (*dec->cur == '}') 1158 if (*dec->cur == '}')
1159 {
1160 ++dec->cur;
1161 break;
1162 }
1163
1164 if (*dec->cur != ',')
1165 ERR (", or } expected while parsing object/hash");
1166
1167 ++dec->cur;
1168
1169 decode_ws (dec);
1170
1171 if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
1172 {
1173 ++dec->cur;
1174 break;
1175 }
1176 }
1177
1178 DEC_DEC_DEPTH;
1179 sv = newRV_noinc ((SV *)hv);
1180
1181 // check filter callbacks
1182 if (dec->json.flags & F_HOOK)
1183 {
1184 if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
730 { 1185 {
731 ++dec->cur; 1186 HE *cb, *he;
732 break; 1187
1188 hv_iterinit (hv);
1189 he = hv_iternext (hv);
1190 hv_iterinit (hv);
1191
1192 // the next line creates a mortal sv each time its called.
1193 // might want to optimise this for common cases.
1194 cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
1195
1196 if (cb)
1197 {
1198 dSP;
1199 int count;
1200
1201 ENTER; SAVETMPS; PUSHMARK (SP);
1202 XPUSHs (HeVAL (he));
1203
1204 PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
1205
1206 if (count == 1)
1207 {
1208 sv = newSVsv (POPs);
1209 FREETMPS; LEAVE;
1210 return sv;
1211 }
1212
1213 FREETMPS; LEAVE;
1214 }
733 } 1215 }
734 1216
735 if (*dec->cur != ',') 1217 if (dec->json.cb_object)
736 ERR (", or } expected while parsing object/hash"); 1218 {
1219 dSP;
1220 int count;
737 1221
738 ++dec->cur; 1222 ENTER; SAVETMPS; PUSHMARK (SP);
739 } 1223 XPUSHs (sv_2mortal (sv));
740 1224
741 return newRV_noinc ((SV *)hv); 1225 PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
1226
1227 if (count == 1)
1228 {
1229 sv = newSVsv (POPs);
1230 FREETMPS; LEAVE;
1231 return sv;
1232 }
1233
1234 SvREFCNT_inc (sv);
1235 FREETMPS; LEAVE;
1236 }
1237 }
1238
1239 return sv;
742 1240
743fail: 1241fail:
744 SvREFCNT_dec (hv); 1242 SvREFCNT_dec (hv);
1243 DEC_DEC_DEPTH;
745 return 0; 1244 return 0;
746} 1245}
747 1246
748static SV * 1247static SV *
749decode_sv (dec_t *dec) 1248decode_sv (dec_t *dec)
750{ 1249{
751 WS; 1250 // the beauty of JSON: you need exactly one character lookahead
1251 // to parse anything.
752 switch (*dec->cur) 1252 switch (*dec->cur)
753 { 1253 {
754 case '"': ++dec->cur; return decode_str (dec); 1254 case '"': ++dec->cur; return decode_str (dec);
755 case '[': ++dec->cur; return decode_av (dec); 1255 case '[': ++dec->cur; return decode_av (dec);
756 case '{': ++dec->cur; return decode_hv (dec); 1256 case '{': ++dec->cur; return decode_hv (dec);
… …
762 1262
763 case 't': 1263 case 't':
764 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4)) 1264 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
765 { 1265 {
766 dec->cur += 4; 1266 dec->cur += 4;
767 return newSViv (1); 1267#if JSON_SLOW
1268 json_true = get_sv ("JSON::XS::true", 1); SvREADONLY_on (json_true);
1269#endif
1270 return SvREFCNT_inc (json_true);
768 } 1271 }
769 else 1272 else
770 ERR ("'true' expected"); 1273 ERR ("'true' expected");
771 1274
772 break; 1275 break;
773 1276
774 case 'f': 1277 case 'f':
775 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5)) 1278 if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
776 { 1279 {
777 dec->cur += 5; 1280 dec->cur += 5;
778 return newSViv (0); 1281#if JSON_SLOW
1282 json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
1283#endif
1284 return SvREFCNT_inc (json_false);
779 } 1285 }
780 else 1286 else
781 ERR ("'false' expected"); 1287 ERR ("'false' expected");
782 1288
783 break; 1289 break;
784 1290
785 case 'n': 1291 case 'n':
786 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4)) 1292 if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))
787 { 1293 {
788 dec->cur += 4; 1294 dec->cur += 4;
789 return newSViv (1); 1295 return newSVsv (&PL_sv_undef);
790 } 1296 }
791 else 1297 else
792 ERR ("'null' expected"); 1298 ERR ("'null' expected");
793 1299
794 break; 1300 break;
795 1301
796 default: 1302 default:
797 ERR ("malformed json string"); 1303 ERR ("malformed JSON string, neither array, object, number, string or atom");
798 break; 1304 break;
799 } 1305 }
800 1306
801fail: 1307fail:
802 return 0; 1308 return 0;
803} 1309}
804 1310
805static SV * 1311static SV *
806decode_json (SV *string, UV flags) 1312decode_json (SV *string, JSON *json, UV *offset_return)
807{ 1313{
1314 dec_t dec;
1315 UV offset;
808 SV *sv; 1316 SV *sv;
809 1317
1318 SvGETMAGIC (string);
1319 SvUPGRADE (string, SVt_PV);
1320
1321 if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
1322 croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
1323 (unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
1324
810 if (!(flags & F_UTF8)) 1325 if (json->flags & F_UTF8)
1326 sv_utf8_downgrade (string, 0);
1327 else
811 sv_utf8_upgrade (string); 1328 sv_utf8_upgrade (string);
812 1329
813 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP 1330 SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
814 1331
815 dec_t dec; 1332 dec.json = *json;
816 dec.flags = flags;
817 dec.cur = SvPVX (string); 1333 dec.cur = SvPVX (string);
818 dec.end = SvEND (string); 1334 dec.end = SvEND (string);
819 dec.err = 0; 1335 dec.err = 0;
1336 dec.depth = 0;
1337 dec.maxdepth = DEC_DEPTH (dec.json.flags);
820 1338
821 *dec.end = 1; // invalid anywhere 1339 if (dec.json.cb_object || dec.json.cb_sk_object)
1340 dec.json.flags |= F_HOOK;
1341
1342 *dec.end = 0; // this should basically be a nop, too, but make sure it's there
1343
1344 decode_ws (&dec);
822 sv = decode_sv (&dec); 1345 sv = decode_sv (&dec);
823 *dec.end = 0; 1346
1347 if (!(offset_return || !sv))
1348 {
1349 // check for trailing garbage
1350 decode_ws (&dec);
1351
1352 if (*dec.cur)
1353 {
1354 dec.err = "garbage after JSON object";
1355 SvREFCNT_dec (sv);
1356 sv = 0;
1357 }
1358 }
1359
1360 if (offset_return || !sv)
1361 {
1362 offset = dec.json.flags & F_UTF8
1363 ? dec.cur - SvPVX (string)
1364 : utf8_distance (dec.cur, SvPVX (string));
1365
1366 if (offset_return)
1367 *offset_return = offset;
1368 }
824 1369
825 if (!sv) 1370 if (!sv)
826 { 1371 {
827 IV offset = utf8_distance (dec.cur, SvPVX (string));
828 SV *uni = sv_newmortal (); 1372 SV *uni = sv_newmortal ();
829 1373
1374 // horrible hack to silence warning inside pv_uni_display
1375 COP cop = *PL_curcop;
1376 cop.cop_warnings = pWARN_NONE;
1377 ENTER;
1378 SAVEVPTR (PL_curcop);
1379 PL_curcop = &cop;
830 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ); 1380 pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
1381 LEAVE;
1382
831 croak ("%s, at character %d (%s)", 1383 croak ("%s, at character offset %d [\"%s\"]",
832 dec.err, 1384 dec.err,
833 (int)offset, 1385 (int)offset,
834 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)"); 1386 dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
835 } 1387 }
836 1388
837 sv = sv_2mortal (sv); 1389 sv = sv_2mortal (sv);
838 1390
839 if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv)) 1391 if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
840 croak ("JSON object or array expected (but number, string, true, false or null found, use allow_nonref to allow this)"); 1392 croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
841 1393
842 return sv; 1394 return sv;
843} 1395}
844 1396
1397/////////////////////////////////////////////////////////////////////////////
1398// XS interface functions
1399
845MODULE = JSON::XS PACKAGE = JSON::XS 1400MODULE = JSON::XS PACKAGE = JSON::XS
846 1401
847BOOT: 1402BOOT:
848{ 1403{
849 int i; 1404 int i;
850 1405
851 memset (decode_hexdigit, 0xff, 256);
852 for (i = 10; i--; ) 1406 for (i = 0; i < 256; ++i)
853 decode_hexdigit ['0' + i] = i; 1407 decode_hexdigit [i] =
1408 i >= '0' && i <= '9' ? i - '0'
1409 : i >= 'a' && i <= 'f' ? i - 'a' + 10
1410 : i >= 'A' && i <= 'F' ? i - 'A' + 10
1411 : -1;
854 1412
855 for (i = 7; i--; ) 1413 json_stash = gv_stashpv ("JSON::XS" , 1);
1414 json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
1415
1416 json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
1417 json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
1418}
1419
1420PROTOTYPES: DISABLE
1421
1422void CLONE (...)
1423 CODE:
1424 json_stash = 0;
1425 json_boolean_stash = 0;
1426
1427void new (char *klass)
1428 PPCODE:
1429{
1430 SV *pv = NEWSV (0, sizeof (JSON));
1431 SvPOK_only (pv);
1432 Zero (SvPVX (pv), 1, JSON);
1433 ((JSON *)SvPVX (pv))->flags = F_DEFAULT;
1434 XPUSHs (sv_2mortal (sv_bless (newRV_noinc (pv), JSON_STASH)));
1435}
1436
1437void ascii (JSON *self, int enable = 1)
1438 ALIAS:
1439 ascii = F_ASCII
1440 latin1 = F_LATIN1
1441 utf8 = F_UTF8
1442 indent = F_INDENT
1443 canonical = F_CANONICAL
1444 space_before = F_SPACE_BEFORE
1445 space_after = F_SPACE_AFTER
1446 pretty = F_PRETTY
1447 allow_nonref = F_ALLOW_NONREF
1448 shrink = F_SHRINK
1449 allow_blessed = F_ALLOW_BLESSED
1450 convert_blessed = F_CONV_BLESSED
1451 relaxed = F_RELAXED
1452 PPCODE:
1453{
1454 if (enable)
1455 self->flags |= ix;
1456 else
1457 self->flags &= ~ix;
1458
1459 XPUSHs (ST (0));
1460}
1461
1462void max_depth (JSON *self, UV max_depth = 0x80000000UL)
1463 PPCODE:
1464{
1465 UV log2 = 0;
1466
1467 if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
1468
1469 while ((1UL << log2) < max_depth)
1470 ++log2;
1471
1472 self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
1473
1474 XPUSHs (ST (0));
1475}
1476
1477void max_size (JSON *self, UV max_size = 0)
1478 PPCODE:
1479{
1480 UV log2 = 0;
1481
1482 if (max_size > 0x80000000UL) max_size = 0x80000000UL;
1483 if (max_size == 1) max_size = 2;
1484
1485 while ((1UL << log2) < max_size)
1486 ++log2;
1487
1488 self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
1489
1490 XPUSHs (ST (0));
1491}
1492
1493void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
1494 PPCODE:
1495{
1496 SvREFCNT_dec (self->cb_object);
1497 self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
1498
1499 XPUSHs (ST (0));
1500}
1501
1502void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
1503 PPCODE:
1504{
1505 if (!self->cb_sk_object)
1506 self->cb_sk_object = newHV ();
1507
1508 if (SvOK (cb))
1509 hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
1510 else
856 { 1511 {
857 decode_hexdigit ['a' + i] = 10 + i; 1512 hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
858 decode_hexdigit ['A' + i] = 10 + i; 1513
1514 if (!HvKEYS (self->cb_sk_object))
1515 {
1516 SvREFCNT_dec (self->cb_sk_object);
1517 self->cb_sk_object = 0;
1518 }
859 } 1519 }
860 1520
861 json_stash = gv_stashpv ("JSON::XS", 1); 1521 XPUSHs (ST (0));
862} 1522}
863 1523
864PROTOTYPES: DISABLE 1524void encode (JSON *self, SV *scalar)
1525 PPCODE:
1526 XPUSHs (encode_json (scalar, self));
865 1527
866SV *new (char *dummy) 1528void decode (JSON *self, SV *jsonstr)
1529 PPCODE:
1530 XPUSHs (decode_json (jsonstr, self, 0));
1531
1532void decode_prefix (JSON *self, SV *jsonstr)
1533 PPCODE:
1534{
1535 UV offset;
1536 EXTEND (SP, 2);
1537 PUSHs (decode_json (jsonstr, self, &offset));
1538 PUSHs (sv_2mortal (newSVuv (offset)));
1539}
1540
1541void DESTROY (JSON *self)
867 CODE: 1542 CODE:
868 RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash); 1543 SvREFCNT_dec (self->cb_sk_object);
869 OUTPUT: 1544 SvREFCNT_dec (self->cb_object);
870 RETVAL
871
872SV *ascii (SV *self, int enable)
873 ALIAS:
874 ascii = F_ASCII
875 utf8 = F_UTF8
876 indent = F_INDENT
877 canonical = F_CANONICAL
878 space_before = F_SPACE_BEFORE
879 space_after = F_SPACE_AFTER
880 json_rpc = F_JSON_RPC
881 pretty = F_PRETTY
882 allow_nonref = F_ALLOW_NONREF
883 CODE:
884{
885 UV *uv = SvJSON (self);
886 if (enable)
887 *uv |= ix;
888 else
889 *uv &= ~ix;
890
891 RETVAL = newSVsv (self);
892}
893 OUTPUT:
894 RETVAL
895
896void encode (SV *self, SV *scalar)
897 PPCODE:
898 XPUSHs (encode_json (scalar, *SvJSON (self)));
899
900void decode (SV *self, SV *jsonstr)
901 PPCODE:
902 XPUSHs (decode_json (jsonstr, *SvJSON (self)));
903 1545
904PROTOTYPES: ENABLE 1546PROTOTYPES: ENABLE
905 1547
906void to_json (SV *scalar) 1548void to_json (SV *scalar)
907 PPCODE: 1549 PPCODE:
1550{
1551 JSON json = { F_DEFAULT | F_UTF8 };
908 XPUSHs (encode_json (scalar, F_UTF8)); 1552 XPUSHs (encode_json (scalar, &json));
1553}
909 1554
910void from_json (SV *jsonstr) 1555void from_json (SV *jsonstr)
911 PPCODE: 1556 PPCODE:
1557{
1558 JSON json = { F_DEFAULT | F_UTF8 };
912 XPUSHs (decode_json (jsonstr, F_UTF8)); 1559 XPUSHs (decode_json (jsonstr, &json, 0));
1560}
913 1561

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