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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 1.70 by root, Wed Mar 19 00:44:54 2008 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	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 ))
16		42
17	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	43	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
18	#define F_DEFAULT 0	44	#define F_DEFAULT (9UL << S_MAXDEPTH)
19		45
20	#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
21		50
22	#define SB do {	51	#define SB do {
23	#define SE } while (0)	52	#define SE } while (0)
24		53
25	static 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
		73	static HV *json_stash, *json_boolean_stash; // JSON::XS::
		74	static SV *json_true, *json_false;
		75
		76	typedef struct {
		77	U32 flags;
		78	SV *cb_object;
		79	HV *cb_sk_object;
		80	} JSON;
		81
		82	/////////////////////////////////////////////////////////////////////////////
		83	// utility functions
		84
		85	inline void
		86	shrink (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
		104	inline UV
		105	decode_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
26		123
27	// structure used for encoding JSON	124	// structure used for encoding JSON
28	typedef struct	125	typedef struct
29	{	126	{
30	char *cur;	127	char *cur; // SvPVX (sv) + current output position
31	STRLEN len; // SvLEN (sv)
32	char *end; // SvEND (sv)	128	char *end; // SvEND (sv)
33	SV *sv;	129	SV *sv; // result scalar
34	UV flags;	130	JSON json;
35	int max_recurse;	131	U32 indent; // indentation level
36	int indent;	132	U32 maxdepth; // max. indentation/recursion level
37	} enc_t;	133	} enc_t;
38		134
39	// structure used for decoding JSON	135	inline void
40	typedef struct
41	{
42	char *cur;
43	char *end;
44	char *err;
45	UV flags;
46	} dec_t;
47
48	static UV *
49	SvJSON (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
59	static void
60	need (enc_t *enc, STRLEN len)	136	need (enc_t *enc, STRLEN len)
61	{	137	{
62	if (enc->cur + len >= enc->end)	138	if (expect_false (enc->cur + len >= enc->end))
63	{	139	{
64	STRLEN cur = enc->cur - SvPVX (enc->sv);	140	STRLEN cur = enc->cur - SvPVX (enc->sv);
65	SvGROW (enc->sv, cur + len + 1);	141	SvGROW (enc->sv, cur + len + 1);
66	enc->cur = SvPVX (enc->sv) + cur;	142	enc->cur = SvPVX (enc->sv) + cur;
67	enc->end = SvEND (enc->sv);	143	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
68	}	144	}
69	}	145	}
70		146
71	static void	147	inline void
72	encode_ch (enc_t *enc, char ch)	148	encode_ch (enc_t *enc, char ch)
73	{	149	{
74	need (enc, 1);	150	need (enc, 1);
75	*enc->cur++ = ch;	151	*enc->cur++ = ch;
76	}	152	}
…		…
78	static void	154	static void
79	encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8)	155	encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8)
80	{	156	{
81	char *end = str + len;	157	char *end = str + len;
82		158
		159	need (enc, len);
		160
83	while (str < end)	161	while (str < end)
84	{	162	{
85	unsigned char ch = *(unsigned char *)str;	163	unsigned char ch = *(unsigned char *)str;
		164
86	if (ch >= 0x20 && ch < 0x80) // most common case	165	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
87	{	166	{
		167	if (expect_false (ch == '"')) // but with slow exceptions
		168	{
		169	need (enc, len += 1);
		170	*enc->cur++ = '\\';
		171	*enc->cur++ = '"';
		172	}
		173	else if (expect_false (ch == '\\'))
		174	{
		175	need (enc, len += 1);
		176	*enc->cur++ = '\\';
		177	*enc->cur++ = '\\';
		178	}
		179	else
88	*enc->cur++ = ch;	180	*enc->cur++ = ch;
		181
89	str++;	182	++str;
90	}	183	}
91	else	184	else
92	{	185	{
93	STRLEN clen;	186	switch (ch)
94	UV uch;
95
96	if (is_utf8)
97	{	187	{
98	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);	188	case '\010': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
99	if (clen < 0)	189	case '\011': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
100	croak ("malformed UTF-8 character in string, cannot convert to JSON");	190	case '\012': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
101	}	191	case '\014': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
102	else	192	case '\015': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
103	{
104	uch = ch;
105	clen = 1;
106	}
107		193
108	need (enc, len += 6);	194	default:
109
110	if (uch < 0xa0 || enc->flags & F_ASCII)
111	{
112	if (uch > 0xFFFFUL)
113	{	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;
114	len += 6;	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	{
115	need (enc, len += 6);	218	need (enc, len += 11);
116	sprintf (enc->cur, "\\u%04x\\u%04x",	219	sprintf (enc->cur, "\\u%04x\\u%04x",
117	(uch - 0x10000) / 0x400 + 0xD800,	220	(int)((uch - 0x10000) / 0x400 + 0xD800),
118	(uch - 0x10000) % 0x400 + 0xDC00);	221	(int)((uch - 0x10000) % 0x400 + 0xDC00));
119	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;
120	}	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	}
121	else	252	else
122	{	253	{
123	sprintf (enc->cur, "\\u%04x", uch);	254	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
124	enc->cur += 6;	255	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
		256	++str;
		257	}
125	}	258	}
126	}	259	}
127	else if (is_utf8)
128	{
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	}	260	}
137		261
138	--len;	262	--len;
139	}	263	}
140	}	264	}
141		265
142	#define INDENT SB \	266	inline void
		267	encode_indent (enc_t *enc)
		268	{
143	if (enc->flags & F_INDENT) \	269	if (enc->json.flags & F_INDENT)
144	{ \	270	{
145	int i_; \	271	int spaces = enc->indent * INDENT_STEP;
146	need (enc, enc->indent); \	272
147	for (i_ = enc->indent * 3; i_--; )\	273	need (enc, spaces);
		274	memset (enc->cur, ' ', spaces);
		275	enc->cur += spaces;
		276	}
		277	}
		278
		279	inline void
		280	encode_space (enc_t *enc)
		281	{
		282	need (enc, 1);
		283	encode_ch (enc, ' ');
		284	}
		285
		286	inline void
		287	encode_nl (enc_t *enc)
		288	{
		289	if (enc->json.flags & F_INDENT)
		290	{
		291	need (enc, 1);
148	encode_ch (enc, ' '); \	292	encode_ch (enc, '\n');
149	} \	293	}
150	SE	294	}
151		295
152	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	296	inline void
153	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	297	encode_comma (enc_t *enc)
154	#define COMMA SB \	298	{
155	encode_ch (enc, ','); \	299	encode_ch (enc, ',');
		300
156	if (enc->flags & F_INDENT) \	301	if (enc->json.flags & F_INDENT)
157	NL; \	302	encode_nl (enc);
158	else if (enc->flags & F_SPACE_AFTER) \	303	else if (enc->json.flags & F_SPACE_AFTER)
159	SPACE; \	304	encode_space (enc);
160	SE	305	}
161		306
162	static void encode_sv (enc_t *enc, SV *sv);	307	static void encode_sv (enc_t *enc, SV *sv);
163		308
164	static void	309	static void
165	encode_av (enc_t *enc, AV *av)	310	encode_av (enc_t *enc, AV *av)
166	{	311	{
167	int i, len = av_len (av);	312	int i, len = av_len (av);
168		313
		314	if (enc->indent >= enc->maxdepth)
		315	croak ("data structure too deep (hit recursion limit)");
		316
169	encode_ch (enc, '['); NL;	317	encode_ch (enc, '[');
170	++enc->indent;	318
		319	if (len >= 0)
		320	{
		321	encode_nl (enc); ++enc->indent;
171		322
172	for (i = 0; i <= len; ++i)	323	for (i = 0; i <= len; ++i)
173	{	324	{
174	INDENT;	325	SV **svp = av_fetch (av, i, 0);
175	encode_sv (enc, *av_fetch (av, i, 0));
176		326
		327	encode_indent (enc);
		328
		329	if (svp)
		330	encode_sv (enc, *svp);
		331	else
		332	encode_str (enc, "null", 4, 0);
		333
177	if (i < len)	334	if (i < len)
178	COMMA;	335	encode_comma (enc);
179	}	336	}
180		337
181	NL;	338	encode_nl (enc); --enc->indent; encode_indent (enc);
182		339	}
183	--enc->indent;	340
184	INDENT; encode_ch (enc, ']');	341	encode_ch (enc, ']');
185	}	342	}
186		343
187	static void	344	static void
188	encode_he (enc_t *enc, HE *he)	345	encode_hk (enc_t *enc, HE *he)
189	{	346	{
190	encode_ch (enc, '"');	347	encode_ch (enc, '"');
191		348
192	if (HeKLEN (he) == HEf_SVKEY)	349	if (HeKLEN (he) == HEf_SVKEY)
193	{	350	{
194	SV *sv = HeSVKEY (he);	351	SV *sv = HeSVKEY (he);
195	STRLEN len;	352	STRLEN len;
		353	char *str;
		354
		355	SvGETMAGIC (sv);
196	char *str = SvPV (sv, len);	356	str = SvPV (sv, len);
197		357
198	encode_str (enc, str, len, SvUTF8 (sv));	358	encode_str (enc, str, len, SvUTF8 (sv));
199	}	359	}
200	else	360	else
201	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	361	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
202		362
203	encode_ch (enc, '"');	363	encode_ch (enc, '"');
204		364
205	if (enc->flags & F_SPACE_BEFORE) SPACE;	365	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
206	encode_ch (enc, ':');	366	encode_ch (enc, ':');
207	if (enc->flags & F_SPACE_AFTER ) SPACE;	367	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
208	encode_sv (enc, HeVAL (he));
209	}	368	}
210		369
211	// compare hash entries, used when all keys are bytestrings	370	// compare hash entries, used when all keys are bytestrings
212	static int	371	static int
213	he_cmp_fast (const void *a_, const void *b_)	372	he_cmp_fast (const void *a_, const void *b_)
…		…
218	HE *b = *(HE **)b_;	377	HE *b = *(HE **)b_;
219		378
220	STRLEN la = HeKLEN (a);	379	STRLEN la = HeKLEN (a);
221	STRLEN lb = HeKLEN (b);	380	STRLEN lb = HeKLEN (b);
222		381
223	if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	382	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
224	cmp = la < lb ? -1 : la == lb ? 0 : 1;	383	cmp = lb - la;
225		384
226	return cmp;	385	return cmp;
227	}	386	}
228		387
229	// compare hash entries, used when some keys are sv's or utf-x	388	// compare hash entries, used when some keys are sv's or utf-x
230	static int	389	static int
231	he_cmp_slow (const void *a, const void *b)	390	he_cmp_slow (const void *a, const void *b)
232	{	391	{
233	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	392	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
234	}	393	}
235		394
236	static void	395	static void
237	encode_hv (enc_t *enc, HV *hv)	396	encode_hv (enc_t *enc, HV *hv)
238	{	397	{
		398	HE *he;
239	int count, i;	399	int count;
240		400
241	encode_ch (enc, '{'); NL; ++enc->indent;	401	if (enc->indent >= enc->maxdepth)
		402	croak ("data structure too deep (hit recursion limit)");
242		403
243	if ((count = hv_iterinit (hv)))	404	encode_ch (enc, '{');
244	{	405
245	// for canonical output we have to sort by keys first	406	// for canonical output we have to sort by keys first
246	// actually, this is mostly due to the stupid so-called	407	// actually, this is mostly due to the stupid so-called
247	// security workaround added somewhere in 5.8.x.	408	// security workaround added somewhere in 5.8.x.
248	// that randomises hash orderings	409	// that randomises hash orderings
249	if (enc->flags & F_CANONICAL)	410	if (enc->json.flags & F_CANONICAL)
		411	{
		412	int count = hv_iterinit (hv);
		413
		414	if (SvMAGICAL (hv))
250	{	415	{
251	HE *he, *hes [count];	416	// need to count by iterating. could improve by dynamically building the vector below
		417	// but I don't care for the speed of this special case.
		418	// note also that we will run into undefined behaviour when the two iterations
		419	// do not result in the same count, something I might care for in some later release.
		420
		421	count = 0;
		422	while (hv_iternext (hv))
		423	++count;
		424
		425	hv_iterinit (hv);
		426	}
		427
		428	if (count)
		429	{
252	int fast = 1;	430	int i, fast = 1;
		431	#if defined(__BORLANDC__) || defined(_MSC_VER)
		432	HE **hes = _alloca (count * sizeof (HE));
		433	#else
		434	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
		435	#endif
253		436
254	i = 0;	437	i = 0;
255	while ((he = hv_iternext (hv)))	438	while ((he = hv_iternext (hv)))
256	{	439	{
257	hes [i++] = he;	440	hes [i++] = he;
…		…
263		446
264	if (fast)	447	if (fast)
265	qsort (hes, count, sizeof (HE *), he_cmp_fast);	448	qsort (hes, count, sizeof (HE *), he_cmp_fast);
266	else	449	else
267	{	450	{
268	// hack to disable "use bytes"	451	// hack to forcefully disable "use bytes"
269	COP *oldcop = PL_curcop, cop;	452	COP cop = *PL_curcop;
270	cop.op_private = 0;	453	cop.op_private = 0;
		454
		455	ENTER;
		456	SAVETMPS;
		457
		458	SAVEVPTR (PL_curcop);
271	PL_curcop = &cop;	459	PL_curcop = &cop;
272		460
273	SAVETMPS;
274	qsort (hes, count, sizeof (HE *), he_cmp_slow);	461	qsort (hes, count, sizeof (HE *), he_cmp_slow);
		462
275	FREETMPS;	463	FREETMPS;
276		464	LEAVE;
277	PL_curcop = oldcop;
278	}	465	}
279		466
280	for (i = 0; i < count; ++i)	467	encode_nl (enc); ++enc->indent;
		468
		469	while (count--)
281	{	470	{
282	INDENT;	471	encode_indent (enc);
		472	he = hes [count];
283	encode_he (enc, hes [i]);	473	encode_hk (enc, he);
		474	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
284		475
285	if (i < count - 1)	476	if (count)
286	COMMA;	477	encode_comma (enc);
287	}	478	}
288		479
		480	encode_nl (enc); --enc->indent; encode_indent (enc);
		481	}
		482	}
		483	else
		484	{
		485	if (hv_iterinit (hv) || SvMAGICAL (hv))
		486	if ((he = hv_iternext (hv)))
289	NL;	487	{
		488	encode_nl (enc); ++enc->indent;
		489
		490	for (;;)
		491	{
		492	encode_indent (enc);
		493	encode_hk (enc, he);
		494	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
		495
		496	if (!(he = hv_iternext (hv)))
		497	break;
		498
		499	encode_comma (enc);
		500	}
		501
		502	encode_nl (enc); --enc->indent; encode_indent (enc);
		503	}
		504	}
		505
		506	encode_ch (enc, '}');
		507	}
		508
		509	// encode objects, arrays and special \0=false and \1=true values.
		510	static void
		511	encode_rv (enc_t *enc, SV *sv)
		512	{
		513	svtype svt;
		514
		515	SvGETMAGIC (sv);
		516	svt = SvTYPE (sv);
		517
		518	if (expect_false (SvOBJECT (sv)))
		519	{
		520	HV *stash = !JSON_SLOW || json_boolean_stash
		521	? json_boolean_stash
		522	: gv_stashpv ("JSON::XS::Boolean", 1);
		523
		524	if (SvSTASH (sv) == stash)
		525	{
		526	if (SvIV (sv))
		527	encode_str (enc, "true", 4, 0);
		528	else
		529	encode_str (enc, "false", 5, 0);
290	}	530	}
291	else	531	else
292	{	532	{
293	SV *sv;	533	#if 0
294	HE *he = hv_iternext (hv);	534	if (0 && sv_derived_from (rv, "JSON::Literal"))
295
296	for (;;)
297	{	535	{
298	INDENT;	536	// not yet
299	encode_he (enc, he);
300
301	if (!(he = hv_iternext (hv)))
302	break;
303
304	COMMA;
305	}	537	}
306		538	#endif
		539	if (enc->json.flags & F_CONV_BLESSED)
307	NL;	540	{
		541	// we re-bless the reference to get overload and other niceties right
		542	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
		543
		544	if (to_json)
		545	{
		546	dSP;
		547
		548	ENTER; SAVETMPS; PUSHMARK (SP);
		549	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		550
		551	// calling with G_SCALAR ensures that we always get a 1 return value
		552	PUTBACK;
		553	call_sv ((SV *)GvCV (to_json), G_SCALAR);
		554	SPAGAIN;
		555
		556	// catch this surprisingly common error
		557	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		558	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		559
		560	sv = POPs;
		561	PUTBACK;
		562
		563	encode_sv (enc, sv);
		564
		565	FREETMPS; LEAVE;
		566	}
		567	else if (enc->json.flags & F_ALLOW_BLESSED)
		568	encode_str (enc, "null", 4, 0);
		569	else
		570	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		571	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		572	}
		573	else if (enc->json.flags & F_ALLOW_BLESSED)
		574	encode_str (enc, "null", 4, 0);
		575	else
		576	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		577	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
308	}	578	}
309	}	579	}
		580	else if (svt == SVt_PVHV)
		581	encode_hv (enc, (HV *)sv);
		582	else if (svt == SVt_PVAV)
		583	encode_av (enc, (AV *)sv);
		584	else if (svt < SVt_PVAV)
		585	{
		586	STRLEN len = 0;
		587	char *pv = svt ? SvPV (sv, len) : 0;
310		588
311	--enc->indent; INDENT; encode_ch (enc, '}');	589	if (len == 1 && *pv == '1')
		590	encode_str (enc, "true", 4, 0);
		591	else if (len == 1 && *pv == '0')
		592	encode_str (enc, "false", 5, 0);
		593	else
		594	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		595	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		596	}
		597	else
		598	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		599	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
312	}	600	}
313		601
314	static void	602	static void
315	encode_sv (enc_t *enc, SV *sv)	603	encode_sv (enc_t *enc, SV *sv)
316	{	604	{
		605	SvGETMAGIC (sv);
		606
317	if (SvPOKp (sv))	607	if (SvPOKp (sv))
318	{	608	{
319	STRLEN len;	609	STRLEN len;
320	char *str = SvPV (sv, len);	610	char *str = SvPV (sv, len);
321	encode_ch (enc, '"');	611	encode_ch (enc, '"');
322	encode_str (enc, str, len, SvUTF8 (sv));	612	encode_str (enc, str, len, SvUTF8 (sv));
323	encode_ch (enc, '"');	613	encode_ch (enc, '"');
324	}	614	}
325	else if (SvNOKp (sv))	615	else if (SvNOKp (sv))
326	{	616	{
		617	// trust that perl will do the right thing w.r.t. JSON syntax.
327	need (enc, NV_DIG + 32);	618	need (enc, NV_DIG + 32);
328	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	619	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
329	enc->cur += strlen (enc->cur);	620	enc->cur += strlen (enc->cur);
330	}	621	}
331	else if (SvIOKp (sv))	622	else if (SvIOKp (sv))
332	{	623	{
333	need (enc, 64);	624	// we assume we can always read an IV as a UV
		625	if (SvUV (sv) & ~(UV)0x7fff)
		626	{
		627	// large integer, use the (rather slow) snprintf way.
		628	need (enc, sizeof (UV) * 3);
334	enc->cur +=	629	enc->cur +=
335	SvIsUV(sv)	630	SvIsUV(sv)
336	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	631	? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
337	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	632	: snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
		633	}
		634	else
		635	{
		636	// optimise the "small number case"
		637	// code will likely be branchless and use only a single multiplication
		638	I32 i = SvIV (sv);
		639	U32 u;
		640	char digit, nz = 0;
		641
		642	need (enc, 6);
		643
		644	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		645	u = i < 0 ? -i : i;
		646
		647	// convert to 4.28 fixed-point representation
		648	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		649
		650	// now output digit by digit, each time masking out the integer part
		651	// and multiplying by 5 while moving the decimal point one to the right,
		652	// resulting in a net multiplication by 10.
		653	// we always write the digit to memory but conditionally increment
		654	// the pointer, to ease the usage of conditional move instructions.
		655	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
		656	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
		657	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
		658	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
		659	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		660	}
338	}	661	}
339	else if (SvROK (sv))	662	else if (SvROK (sv))
340	{	663	encode_rv (enc, SvRV (sv));
341	if (!--enc->max_recurse)
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))	664	else if (!SvOK (sv))
356	encode_str (enc, "null", 4, 0);	665	encode_str (enc, "null", 4, 0);
357	else	666	else
358	croak ("encountered perl type that JSON cannot handle");	667	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
		668	SvPV_nolen (sv), SvFLAGS (sv));
359	}	669	}
360		670
361	static SV *	671	static SV *
362	encode_json (SV *scalar, UV flags)	672	encode_json (SV *scalar, JSON *json)
363	{	673	{
364	enc_t enc;	674	enc_t enc;
365	enc.flags = flags;	675
		676	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
		677	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
		678
		679	enc.json = *json;
366	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	680	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
367	enc.cur = SvPVX (enc.sv);	681	enc.cur = SvPVX (enc.sv);
368	enc.end = SvEND (enc.sv);	682	enc.end = SvEND (enc.sv);
369	enc.max_recurse = 0;
370	enc.indent = 0;	683	enc.indent = 0;
		684	enc.maxdepth = DEC_DEPTH (enc.json.flags);
371		685
372	SvPOK_only (enc.sv);	686	SvPOK_only (enc.sv);
373	encode_sv (&enc, scalar);	687	encode_sv (&enc, scalar);
374		688
		689	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		690	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		691
375	if (!(flags & (F_ASCII | F_UTF8)))	692	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
376	SvUTF8_on (enc.sv);	693	SvUTF8_on (enc.sv);
377		694
378	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));	695	if (enc.json.flags & F_SHRINK)
		696	shrink (enc.sv);
		697
379	return enc.sv;	698	return enc.sv;
380	}	699	}
381		700
382	/////////////////////////////////////////////////////////////////////////////	701	/////////////////////////////////////////////////////////////////////////////
		702	// decoder
383		703
384	#define WS \	704	// structure used for decoding JSON
		705	typedef struct
		706	{
		707	char *cur; // current parser pointer
		708	char *end; // end of input string
		709	const char *err; // parse error, if != 0
		710	JSON json;
		711	U32 depth; // recursion depth
		712	U32 maxdepth; // recursion depth limit
		713	} dec_t;
		714
		715	inline void
		716	decode_comment (dec_t *dec)
		717	{
		718	// only '#'-style comments allowed a.t.m.
		719
		720	while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
		721	++dec->cur;
		722	}
		723
		724	inline void
		725	decode_ws (dec_t *dec)
		726	{
385	for (;;) \	727	for (;;)
386	{ \	728	{
387	char ch = *dec->cur; \	729	char ch = *dec->cur;
		730
388	if (ch > 0x20 \	731	if (ch > 0x20)
		732	{
		733	if (expect_false (ch == '#'))
		734	{
		735	if (dec->json.flags & F_RELAXED)
		736	decode_comment (dec);
		737	else
		738	break;
		739	}
		740	else
		741	break;
		742	}
389	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	743	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
390	break; \	744	break; // parse error, but let higher level handle it, gives better error messages
		745
391	++dec->cur; \	746	++dec->cur;
392	}	747	}
		748	}
393		749
394	#define ERR(reason) SB dec->err = reason; goto fail; SE	750	#define ERR(reason) SB dec->err = reason; goto fail; SE
		751
395	#define EXPECT_CH(ch) SB \	752	#define EXPECT_CH(ch) SB \
396	if (*dec->cur != ch) \	753	if (*dec->cur != ch) \
397	ERR (# ch " expected"); \	754	ERR (# ch " expected"); \
398	++dec->cur; \	755	++dec->cur; \
399	SE	756	SE
400		757
		758	#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
		759	#define DEC_DEC_DEPTH --dec->depth
		760
401	static SV *decode_sv (dec_t *dec);	761	static 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		762
408	static signed char decode_hexdigit[256];	763	static signed char decode_hexdigit[256];
409		764
410	static UV	765	static UV
411	decode_4hex (dec_t *dec)	766	decode_4hex (dec_t *dec)
412	{	767	{
413	signed char d1, d2, d3, d4;	768	signed char d1, d2, d3, d4;
		769	unsigned char *cur = (unsigned char *)dec->cur;
414		770
415	d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]];	771	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");	772	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]];	773	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");	774	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		775
424	dec->cur += 4;	776	dec->cur += 4;
425		777
426	return ((UV)d1) << 12	778	return ((UV)d1) << 12
427	| ((UV)d2) << 8	779	| ((UV)d2) << 8
…		…
433	}	785	}
434		786
435	static SV *	787	static SV *
436	decode_str (dec_t *dec)	788	decode_str (dec_t *dec)
437	{	789	{
438	SV *sv = NEWSV (0,2);	790	SV *sv = 0;
439	STRLEN cur = 0;
440	int utf8 = 0;	791	int utf8 = 0;
		792	char *dec_cur = dec->cur;
441		793
442	for (;;)	794	do
443	{	795	{
444	unsigned char ch = *(unsigned char *)dec->cur;	796	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		797	char *cur = buf;
445		798
446	if (ch == '"')	799	do
447	break;
448	else if (ch == '\\')
449	{	800	{
450	switch (*++dec->cur)	801	unsigned char ch = *(unsigned char *)dec_cur++;
		802
		803	if (expect_false (ch == '"'))
451	{	804	{
452	case '\\':	805	--dec_cur;
453	case '/':	806	break;
454	case '"': APPEND_CH (*dec->cur++); break;	807	}
455		808	else if (expect_false (ch == '\\'))
456	case 'b': APPEND_CH ('\010'); ++dec->cur; break;	809	{
457	case 't': APPEND_CH ('\011'); ++dec->cur; break;	810	switch (*dec_cur)
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	{	811	{
464	UV lo, hi;	812	case '\\':
465	++dec->cur;	813	case '/':
		814	case '"': *cur++ = *dec_cur++; break;
466		815
467	hi = decode_4hex (dec);	816	case 'b': ++dec_cur; *cur++ = '\010'; break;
468	if (hi == (UV)-1)	817	case 't': ++dec_cur; *cur++ = '\011'; break;
469	goto fail;	818	case 'n': ++dec_cur; *cur++ = '\012'; break;
		819	case 'f': ++dec_cur; *cur++ = '\014'; break;
		820	case 'r': ++dec_cur; *cur++ = '\015'; break;
470		821
471	// possibly a surrogate pair	822	case 'u':
472	if (hi >= 0xd800 && hi < 0xdc00)
473	{	823	{
474	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	824	UV lo, hi;
475	ERR ("illegal surrogate character");	825	++dec_cur;
476		826
477	dec->cur += 2;	827	dec->cur = dec_cur;
478
479	lo = decode_4hex (dec);	828	hi = decode_4hex (dec);
		829	dec_cur = dec->cur;
480	if (lo == (UV)-1)	830	if (hi == (UV)-1)
481	goto fail;	831	goto fail;
482		832
		833	// possibly a surrogate pair
		834	if (hi >= 0xd800)
		835	if (hi < 0xdc00)
		836	{
		837	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
		838	ERR ("missing low surrogate character in surrogate pair");
		839
		840	dec_cur += 2;
		841
		842	dec->cur = dec_cur;
		843	lo = decode_4hex (dec);
		844	dec_cur = dec->cur;
		845	if (lo == (UV)-1)
		846	goto fail;
		847
483	if (lo < 0xdc00 || lo >= 0xe000)	848	if (lo < 0xdc00 || lo >= 0xe000)
484	ERR ("surrogate pair expected");	849	ERR ("surrogate pair expected");
485		850
486	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;	851	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
		852	}
		853	else if (hi < 0xe000)
		854	ERR ("missing high surrogate character in surrogate pair");
		855
		856	if (hi >= 0x80)
		857	{
		858	utf8 = 1;
		859
		860	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
		861	}
		862	else
		863	*cur++ = hi;
487	}	864	}
488	else if (lo >= 0xdc00 && lo < 0xe000)
489	ERR ("illegal surrogate character");
490
491	if (hi >= 0x80)
492	{	865	break;
493	utf8 = 1;
494		866
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	867	default:
499	APPEND_CH (hi);	868	--dec_cur;
		869	ERR ("illegal backslash escape sequence in string");
500	}	870	}
		871	}
		872	else if (expect_true (ch >= 0x20 && ch <= 0x7f))
		873	*cur++ = ch;
		874	else if (ch >= 0x80)
		875	{
		876	STRLEN clen;
		877	UV uch;
		878
		879	--dec_cur;
		880
		881	uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		882	if (clen == (STRLEN)-1)
		883	ERR ("malformed UTF-8 character in JSON string");
		884
		885	do
		886	*cur++ = *dec_cur++;
		887	while (--clen);
		888
		889	utf8 = 1;
		890	}
		891	else
		892	{
		893	--dec_cur;
		894
		895	if (!ch)
		896	ERR ("unexpected end of string while parsing JSON string");
501	break;	897	else
		898	ERR ("invalid character encountered while parsing JSON string");
502	}	899	}
503	}	900	}
504	else if (ch >= 0x20 && ch <= 0x7f)	901	while (cur < buf + SHORT_STRING_LEN);
505	APPEND_CH (*dec->cur++);	902
506	else if (ch >= 0x80)	903	{
		904	STRLEN len = cur - buf;
		905
		906	if (sv)
507	{	907	{
508	STRLEN clen;	908	SvGROW (sv, SvCUR (sv) + len + 1);
509	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);	909	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
510	if (clen < 0)	910	SvCUR_set (sv, SvCUR (sv) + len);
511	ERR ("malformed UTF-8 character in string, cannot convert to JSON");
512
513	SvGROW (sv, cur + clen + 1); // at most 4 bytes for 21 bits
514	memcpy (SvPVX (sv) + cur, dec->cur, clen);
515	dec->cur += clen;
516	}	911	}
517	else	912	else
518	ERR ("invalid character encountered");	913	sv = newSVpvn (buf, len);
519	}	914	}
		915	}
		916	while (*dec_cur != '"');
520		917
521	++dec->cur;	918	++dec_cur;
522		919
		920	if (sv)
		921	{
523	SvPOK_only (sv);	922	SvPOK_only (sv);
524
525	SvCUR_set (sv, cur);
526	*SvEND (sv) = 0;	923	*SvEND (sv) = 0;
527		924
528	if (utf8)	925	if (utf8)
529	SvUTF8_on (sv);	926	SvUTF8_on (sv);
		927	}
		928	else
		929	sv = newSVpvn ("", 0);
530		930
		931	dec->cur = dec_cur;
531	return sv;	932	return sv;
532		933
533	fail:	934	fail:
534	SvREFCNT_dec (sv);	935	dec->cur = dec_cur;
535	return 0;	936	return 0;
536	}	937	}
537		938
538	static SV *	939	static SV *
539	decode_num (dec_t *dec)	940	decode_num (dec_t *dec)
…		…
549	{	950	{
550	++dec->cur;	951	++dec->cur;
551	if (*dec->cur >= '0' && *dec->cur <= '9')	952	if (*dec->cur >= '0' && *dec->cur <= '9')
552	ERR ("malformed number (leading zero must not be followed by another digit)");	953	ERR ("malformed number (leading zero must not be followed by another digit)");
553	}	954	}
554		955	else if (*dec->cur < '0' || *dec->cur > '9')
555	// int	956	ERR ("malformed number (no digits after initial minus)");
		957	else
		958	do
		959	{
		960	++dec->cur;
		961	}
556	while (*dec->cur >= '0' && *dec->cur <= '9')	962	while (*dec->cur >= '0' && *dec->cur <= '9');
557	++dec->cur;
558		963
559	// [frac]	964	// [frac]
560	if (*dec->cur == '.')	965	if (*dec->cur == '.')
561	{	966	{
562	is_nv = 1;	967	++dec->cur;
		968
		969	if (*dec->cur < '0' || *dec->cur > '9')
		970	ERR ("malformed number (no digits after decimal point)");
563		971
564	do	972	do
565	{	973	{
566	++dec->cur;	974	++dec->cur;
567	}	975	}
568	while (*dec->cur >= '0' && *dec->cur <= '9');	976	while (*dec->cur >= '0' && *dec->cur <= '9');
		977
		978	is_nv = 1;
569	}	979	}
570		980
571	// [exp]	981	// [exp]
572	if (*dec->cur == 'e' || *dec->cur == 'E')	982	if (*dec->cur == 'e' || *dec->cur == 'E')
573	{	983	{
574	is_nv = 1;
575
576	++dec->cur;	984	++dec->cur;
		985
577	if (*dec->cur == '-' || *dec->cur == '+')	986	if (*dec->cur == '-' || *dec->cur == '+')
578	++dec->cur;	987	++dec->cur;
579		988
		989	if (*dec->cur < '0' || *dec->cur > '9')
		990	ERR ("malformed number (no digits after exp sign)");
		991
		992	do
		993	{
		994	++dec->cur;
		995	}
580	while (*dec->cur >= '0' && *dec->cur <= '9')	996	while (*dec->cur >= '0' && *dec->cur <= '9');
581	++dec->cur;	997
		998	is_nv = 1;
582	}	999	}
583		1000
584	if (!is_nv)	1001	if (!is_nv)
585	{	1002	{
586	UV uv;	1003	int len = dec->cur - start;
587	int numtype = grok_number (start, dec->cur - start, &uv);	1004
588	if (numtype & IS_NUMBER_IN_UV)	1005	// special case the rather common 1..5-digit-int case
589	if (numtype & IS_NUMBER_NEG)	1006	if (*start == '-')
		1007	switch (len)
590	{	1008	{
591	if (uv < (UV)IV_MIN)	1009	case 2: return newSViv (-( start [1] - '0' * 1));
592	return newSViv (-(IV)uv);	1010	case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
		1011	case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		1012	case 5: return newSViv (-( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
		1013	case 6: return newSViv (-(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
593	}	1014	}
		1015	else
		1016	switch (len)
		1017	{
		1018	case 1: return newSViv ( start [0] - '0' * 1);
		1019	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1020	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1021	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1022	case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
		1023	}
		1024
		1025	{
		1026	UV uv;
		1027	int numtype = grok_number (start, len, &uv);
		1028	if (numtype & IS_NUMBER_IN_UV)
		1029	if (numtype & IS_NUMBER_NEG)
		1030	{
		1031	if (uv < (UV)IV_MIN)
		1032	return newSViv (-(IV)uv);
		1033	}
594	else	1034	else
595	return newSVuv (uv);	1035	return newSVuv (uv);
596	}	1036	}
597		1037
		1038	len -= *start == '-' ? 1 : 0;
		1039
		1040	// does not fit into IV or UV, try NV
		1041	if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len)
		1042	#if defined (LDBL_DIG)
		1043	|| (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len)
		1044	#endif
		1045	)
		1046	// fits into NV without loss of precision
		1047	return newSVnv (Atof (start));
		1048
		1049	// everything else fails, convert it to a string
		1050	return newSVpvn (start, dec->cur - start);
		1051	}
		1052
		1053	// loss of precision here
598	return newSVnv (Atof (start));	1054	return newSVnv (Atof (start));
599		1055
600	fail:	1056	fail:
601	return 0;	1057	return 0;
602	}	1058	}
…		…
604	static SV *	1060	static SV *
605	decode_av (dec_t *dec)	1061	decode_av (dec_t *dec)
606	{	1062	{
607	AV *av = newAV ();	1063	AV *av = newAV ();
608		1064
		1065	DEC_INC_DEPTH;
		1066	decode_ws (dec);
		1067
		1068	if (*dec->cur == ']')
		1069	++dec->cur;
		1070	else
609	for (;;)	1071	for (;;)
610	{	1072	{
611	SV *value;	1073	SV *value;
612		1074
613	value = decode_sv (dec);	1075	value = decode_sv (dec);
614	if (!value)	1076	if (!value)
615	goto fail;	1077	goto fail;
616		1078
617	av_push (av, value);	1079	av_push (av, value);
618		1080
619	WS;	1081	decode_ws (dec);
620		1082
621	if (*dec->cur == ']')	1083	if (*dec->cur == ']')
622	{	1084	{
623	++dec->cur;	1085	++dec->cur;
624	break;	1086	break;
		1087	}
625	}	1088
626
627	if (*dec->cur != ',')	1089	if (*dec->cur != ',')
628	ERR (", or ] expected while parsing array");	1090	ERR (", or ] expected while parsing array");
629		1091
630	++dec->cur;	1092	++dec->cur;
		1093
		1094	decode_ws (dec);
		1095
		1096	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1097	{
		1098	++dec->cur;
		1099	break;
		1100	}
631	}	1101	}
632		1102
		1103	DEC_DEC_DEPTH;
633	return newRV_noinc ((SV *)av);	1104	return newRV_noinc ((SV *)av);
634		1105
635	fail:	1106	fail:
636	SvREFCNT_dec (av);	1107	SvREFCNT_dec (av);
		1108	DEC_DEC_DEPTH;
637	return 0;	1109	return 0;
638	}	1110	}
639		1111
640	static SV *	1112	static SV *
641	decode_hv (dec_t *dec)	1113	decode_hv (dec_t *dec)
642	{	1114	{
		1115	SV *sv;
643	HV *hv = newHV ();	1116	HV *hv = newHV ();
644		1117
		1118	DEC_INC_DEPTH;
		1119	decode_ws (dec);
		1120
		1121	if (*dec->cur == '}')
		1122	++dec->cur;
		1123	else
645	for (;;)	1124	for (;;)
646	{	1125	{
647	SV *key, *value;
648
649	WS; EXPECT_CH ('"');	1126	EXPECT_CH ('"');
650		1127
651	key = decode_str (dec);	1128	// heuristic: assume that
652	if (!key)	1129	// a) decode_str + hv_store_ent are abysmally slow.
653	goto fail;	1130	// b) most hash keys are short, simple ascii text.
654		1131	// => try to "fast-match" such strings to avoid
655	WS; EXPECT_CH (':');	1132	// the overhead of decode_str + hv_store_ent.
656
657	value = decode_sv (dec);
658	if (!value)
659	{	1133	{
		1134	SV *value;
		1135	char *p = dec->cur;
		1136	char *e = p + 24; // only try up to 24 bytes
		1137
		1138	for (;;)
		1139	{
		1140	// the >= 0x80 is true on most architectures
		1141	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1142	{
		1143	// slow path, back up and use decode_str
		1144	SV *key = decode_str (dec);
		1145	if (!key)
		1146	goto fail;
		1147
		1148	decode_ws (dec); EXPECT_CH (':');
		1149
		1150	decode_ws (dec);
		1151	value = decode_sv (dec);
		1152	if (!value)
		1153	{
		1154	SvREFCNT_dec (key);
		1155	goto fail;
		1156	}
		1157
		1158	hv_store_ent (hv, key, value, 0);
660	SvREFCNT_dec (key);	1159	SvREFCNT_dec (key);
		1160
		1161	break;
		1162	}
		1163	else if (*p == '"')
		1164	{
		1165	// fast path, got a simple key
		1166	char *key = dec->cur;
		1167	int len = p - key;
		1168	dec->cur = p + 1;
		1169
		1170	decode_ws (dec); EXPECT_CH (':');
		1171
		1172	decode_ws (dec);
		1173	value = decode_sv (dec);
		1174	if (!value)
661	goto fail;	1175	goto fail;
		1176
		1177	hv_store (hv, key, len, value, 0);
		1178
		1179	break;
		1180	}
		1181
		1182	++p;
		1183	}
662	}	1184	}
663		1185
664	//TODO: optimise	1186	decode_ws (dec);
665	hv_store_ent (hv, key, value, 0);
666		1187
667	WS;
668
669	if (*dec->cur == '}')	1188	if (*dec->cur == '}')
		1189	{
		1190	++dec->cur;
		1191	break;
		1192	}
		1193
		1194	if (*dec->cur != ',')
		1195	ERR (", or } expected while parsing object/hash");
		1196
		1197	++dec->cur;
		1198
		1199	decode_ws (dec);
		1200
		1201	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1202	{
		1203	++dec->cur;
		1204	break;
		1205	}
		1206	}
		1207
		1208	DEC_DEC_DEPTH;
		1209	sv = newRV_noinc ((SV *)hv);
		1210
		1211	// check filter callbacks
		1212	if (dec->json.flags & F_HOOK)
		1213	{
		1214	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
670	{	1215	{
671	++dec->cur;	1216	HE *cb, *he;
672	break;	1217
		1218	hv_iterinit (hv);
		1219	he = hv_iternext (hv);
		1220	hv_iterinit (hv);
		1221
		1222	// the next line creates a mortal sv each time its called.
		1223	// might want to optimise this for common cases.
		1224	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1225
		1226	if (cb)
		1227	{
		1228	dSP;
		1229	int count;
		1230
		1231	ENTER; SAVETMPS; PUSHMARK (SP);
		1232	XPUSHs (HeVAL (he));
		1233
		1234	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1235
		1236	if (count == 1)
		1237	{
		1238	sv = newSVsv (POPs);
		1239	FREETMPS; LEAVE;
		1240	return sv;
		1241	}
		1242
		1243	FREETMPS; LEAVE;
		1244	}
673	}	1245	}
674		1246
675	if (*dec->cur != ',')	1247	if (dec->json.cb_object)
676	ERR (", or } expected while parsing object/hash");	1248	{
		1249	dSP;
		1250	int count;
677		1251
678	++dec->cur;	1252	ENTER; SAVETMPS; PUSHMARK (SP);
679	}	1253	XPUSHs (sv_2mortal (sv));
680		1254
681	return newRV_noinc ((SV *)hv);	1255	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1256
		1257	if (count == 1)
		1258	{
		1259	sv = newSVsv (POPs);
		1260	FREETMPS; LEAVE;
		1261	return sv;
		1262	}
		1263
		1264	SvREFCNT_inc (sv);
		1265	FREETMPS; LEAVE;
		1266	}
		1267	}
		1268
		1269	return sv;
682		1270
683	fail:	1271	fail:
684	SvREFCNT_dec (hv);	1272	SvREFCNT_dec (hv);
		1273	DEC_DEC_DEPTH;
685	return 0;	1274	return 0;
686	}	1275	}
687		1276
688	static SV *	1277	static SV *
689	decode_sv (dec_t *dec)	1278	decode_sv (dec_t *dec)
690	{	1279	{
691	WS;	1280	// the beauty of JSON: you need exactly one character lookahead
		1281	// to parse anything.
692	switch (*dec->cur)	1282	switch (*dec->cur)
693	{	1283	{
694	case '"': ++dec->cur; return decode_str (dec);	1284	case '"': ++dec->cur; return decode_str (dec);
695	case '[': ++dec->cur; return decode_av (dec);	1285	case '[': ++dec->cur; return decode_av (dec);
696	case '{': ++dec->cur; return decode_hv (dec);	1286	case '{': ++dec->cur; return decode_hv (dec);
…		…
702		1292
703	case 't':	1293	case 't':
704	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1294	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
705	{	1295	{
706	dec->cur += 4;	1296	dec->cur += 4;
707	return newSViv (1);	1297	#if JSON_SLOW
		1298	json_true = get_sv ("JSON::XS::true", 1); SvREADONLY_on (json_true);
		1299	#endif
		1300	return SvREFCNT_inc (json_true);
708	}	1301	}
709	else	1302	else
710	ERR ("'true' expected");	1303	ERR ("'true' expected");
711		1304
712	break;	1305	break;
713		1306
714	case 'f':	1307	case 'f':
715	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1308	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
716	{	1309	{
717	dec->cur += 5;	1310	dec->cur += 5;
718	return newSViv (0);	1311	#if JSON_SLOW
		1312	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1313	#endif
		1314	return SvREFCNT_inc (json_false);
719	}	1315	}
720	else	1316	else
721	ERR ("'false' expected");	1317	ERR ("'false' expected");
722		1318
723	break;	1319	break;
724		1320
725	case 'n':	1321	case 'n':
726	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))	1322	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))
727	{	1323	{
728	dec->cur += 4;	1324	dec->cur += 4;
729	return newSViv (1);	1325	return newSVsv (&PL_sv_undef);
730	}	1326	}
731	else	1327	else
732	ERR ("'null' expected");	1328	ERR ("'null' expected");
733		1329
734	break;	1330	break;
735		1331
736	default:	1332	default:
737	ERR ("malformed json string");	1333	ERR ("malformed JSON string, neither array, object, number, string or atom");
738	break;	1334	break;
739	}	1335	}
740		1336
741	fail:	1337	fail:
742	return 0;	1338	return 0;
743	}	1339	}
744		1340
745	static SV *	1341	static SV *
746	decode_json (SV *string, UV flags)	1342	decode_json (SV *string, JSON *json, UV *offset_return)
747	{	1343	{
		1344	dec_t dec;
		1345	UV offset;
748	SV *sv;	1346	SV *sv;
749		1347
		1348	SvGETMAGIC (string);
		1349	SvUPGRADE (string, SVt_PV);
		1350
		1351	if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
		1352	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1353	(unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
		1354
750	if (!(flags & F_UTF8))	1355	if (json->flags & F_UTF8)
		1356	sv_utf8_downgrade (string, 0);
		1357	else
751	sv_utf8_upgrade (string);	1358	sv_utf8_upgrade (string);
752		1359
753	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1360	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
754		1361
755	dec_t dec;	1362	dec.json = *json;
756	dec.flags = flags;
757	dec.cur = SvPVX (string);	1363	dec.cur = SvPVX (string);
758	dec.end = SvEND (string);	1364	dec.end = SvEND (string);
759	dec.err = 0;	1365	dec.err = 0;
		1366	dec.depth = 0;
		1367	dec.maxdepth = DEC_DEPTH (dec.json.flags);
760		1368
761	*dec.end = 1; // invalid anywhere	1369	if (dec.json.cb_object || dec.json.cb_sk_object)
		1370	dec.json.flags |= F_HOOK;
		1371
		1372	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1373
		1374	decode_ws (&dec);
762	sv = decode_sv (&dec);	1375	sv = decode_sv (&dec);
763	*dec.end = 0;	1376
		1377	if (!(offset_return || !sv))
		1378	{
		1379	// check for trailing garbage
		1380	decode_ws (&dec);
		1381
		1382	if (*dec.cur)
		1383	{
		1384	dec.err = "garbage after JSON object";
		1385	SvREFCNT_dec (sv);
		1386	sv = 0;
		1387	}
		1388	}
		1389
		1390	if (offset_return || !sv)
		1391	{
		1392	offset = dec.json.flags & F_UTF8
		1393	? dec.cur - SvPVX (string)
		1394	: utf8_distance (dec.cur, SvPVX (string));
		1395
		1396	if (offset_return)
		1397	*offset_return = offset;
		1398	}
764		1399
765	if (!sv)	1400	if (!sv)
766	{	1401	{
767	IV offset = utf8_distance (dec.cur, SvPVX (string));
768	SV *uni = sv_newmortal ();	1402	SV *uni = sv_newmortal ();
769		1403
		1404	// horrible hack to silence warning inside pv_uni_display
		1405	COP cop = *PL_curcop;
		1406	cop.cop_warnings = pWARN_NONE;
		1407	ENTER;
		1408	SAVEVPTR (PL_curcop);
		1409	PL_curcop = &cop;
770	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1410	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
		1411	LEAVE;
		1412
771	croak ("%s, at character %d (%s)",	1413	croak ("%s, at character offset %d [\"%s\"]",
772	dec.err,	1414	dec.err,
773	(int)offset,	1415	(int)offset,
774	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1416	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
775	}	1417	}
776		1418
777	sv_dump (sv);//D
778	return sv_2mortal (sv);	1419	sv = sv_2mortal (sv);
		1420
		1421	if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
		1422	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
		1423
		1424	return sv;
779	}	1425	}
		1426
		1427	/////////////////////////////////////////////////////////////////////////////
		1428	// XS interface functions
780		1429
781	MODULE = JSON::XS PACKAGE = JSON::XS	1430	MODULE = JSON::XS PACKAGE = JSON::XS
782		1431
783	BOOT:	1432	BOOT:
784	{	1433	{
785	int i;	1434	int i;
786		1435
787	memset (decode_hexdigit, 0xff, 256);
788	for (i = 10; i--; )	1436	for (i = 0; i < 256; ++i)
789	decode_hexdigit ['0' + i] = i;	1437	decode_hexdigit [i] =
		1438	i >= '0' && i <= '9' ? i - '0'
		1439	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1440	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1441	: -1;
790		1442
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);	1443	json_stash = gv_stashpv ("JSON::XS" , 1);
798	}	1444	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
799		1445
800	SV *new (char *dummy)	1446	json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
		1447	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1448	}
		1449
		1450	PROTOTYPES: DISABLE
		1451
		1452	void CLONE (...)
801	CODE:	1453	CODE:
802	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1454	json_stash = 0;
		1455	json_boolean_stash = 0;
		1456
		1457	void new (char *klass)
		1458	PPCODE:
		1459	{
		1460	SV *pv = NEWSV (0, sizeof (JSON));
		1461	SvPOK_only (pv);
		1462	Zero (SvPVX (pv), 1, JSON);
		1463	((JSON *)SvPVX (pv))->flags = F_DEFAULT;
		1464	XPUSHs (sv_2mortal (sv_bless (
		1465	newRV_noinc (pv),
		1466	strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
		1467	)));
		1468	}
		1469
		1470	void ascii (JSON *self, int enable = 1)
		1471	ALIAS:
		1472	ascii = F_ASCII
		1473	latin1 = F_LATIN1
		1474	utf8 = F_UTF8
		1475	indent = F_INDENT
		1476	canonical = F_CANONICAL
		1477	space_before = F_SPACE_BEFORE
		1478	space_after = F_SPACE_AFTER
		1479	pretty = F_PRETTY
		1480	allow_nonref = F_ALLOW_NONREF
		1481	shrink = F_SHRINK
		1482	allow_blessed = F_ALLOW_BLESSED
		1483	convert_blessed = F_CONV_BLESSED
		1484	relaxed = F_RELAXED
		1485	PPCODE:
		1486	{
		1487	if (enable)
		1488	self->flags |= ix;
		1489	else
		1490	self->flags &= ~ix;
		1491
		1492	XPUSHs (ST (0));
		1493	}
		1494
		1495	void get_ascii (JSON *self)
		1496	ALIAS:
		1497	get_ascii = F_ASCII
		1498	get_latin1 = F_LATIN1
		1499	get_utf8 = F_UTF8
		1500	get_indent = F_INDENT
		1501	get_canonical = F_CANONICAL
		1502	get_space_before = F_SPACE_BEFORE
		1503	get_space_after = F_SPACE_AFTER
		1504	get_allow_nonref = F_ALLOW_NONREF
		1505	get_shrink = F_SHRINK
		1506	get_allow_blessed = F_ALLOW_BLESSED
		1507	get_convert_blessed = F_CONV_BLESSED
		1508	get_relaxed = F_RELAXED
		1509	PPCODE:
		1510	XPUSHs (boolSV (self->flags & ix));
		1511
		1512	void max_depth (JSON *self, UV max_depth = 0x80000000UL)
		1513	PPCODE:
		1514	{
		1515	UV log2 = 0;
		1516
		1517	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
		1518
		1519	while ((1UL << log2) < max_depth)
		1520	++log2;
		1521
		1522	self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
		1523
		1524	XPUSHs (ST (0));
		1525	}
		1526
		1527	U32 get_max_depth (JSON *self)
		1528	CODE:
		1529	RETVAL = DEC_DEPTH (self->flags);
803	OUTPUT:	1530	OUTPUT:
804	RETVAL	1531	RETVAL
805		1532
806	SV *ascii (SV *self, int enable)	1533	void max_size (JSON *self, UV max_size = 0)
807	ALIAS:	1534	PPCODE:
808	ascii = F_ASCII	1535	{
809	utf8 = F_UTF8	1536	UV log2 = 0;
810	indent = F_INDENT	1537
811	canonical = F_CANONICAL	1538	if (max_size > 0x80000000UL) max_size = 0x80000000UL;
812	space_before = F_SPACE_BEFORE	1539	if (max_size == 1) max_size = 2;
813	space_after = F_SPACE_AFTER	1540
814	json_rpc = F_JSON_RPC	1541	while ((1UL << log2) < max_size)
815	pretty = F_PRETTY	1542	++log2;
		1543
		1544	self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
		1545
		1546	XPUSHs (ST (0));
		1547	}
		1548
		1549	int get_max_size (JSON *self)
816	CODE:	1550	CODE:
817	{	1551	RETVAL = DEC_SIZE (self->flags);
818	UV *uv = SvJSON (self);
819	if (enable)
820	*uv |= ix;
821	else
822	*uv &= ~ix;
823
824	RETVAL = newSVsv (self);
825	}
826	OUTPUT:	1552	OUTPUT:
827	RETVAL	1553	RETVAL
828		1554
829	void encode (SV *self, SV *scalar)	1555	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
830	PPCODE:	1556	PPCODE:
831	XPUSHs (encode_json (scalar, *SvJSON (self)));	1557	{
		1558	SvREFCNT_dec (self->cb_object);
		1559	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
832		1560
833	void decode (SV *self, SV *jsonstr)	1561	XPUSHs (ST (0));
		1562	}
		1563
		1564	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
834	PPCODE:	1565	PPCODE:
835	XPUSHs (decode_json (jsonstr, *SvJSON (self)));	1566	{
		1567	if (!self->cb_sk_object)
		1568	self->cb_sk_object = newHV ();
836		1569
837	void to_json (SV *scalar)	1570	if (SvOK (cb))
		1571	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1572	else
		1573	{
		1574	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
		1575
		1576	if (!HvKEYS (self->cb_sk_object))
		1577	{
		1578	SvREFCNT_dec (self->cb_sk_object);
		1579	self->cb_sk_object = 0;
		1580	}
		1581	}
		1582
		1583	XPUSHs (ST (0));
		1584	}
		1585
		1586	void encode (JSON *self, SV *scalar)
838	PPCODE:	1587	PPCODE:
839	XPUSHs (encode_json (scalar, F_UTF8));	1588	XPUSHs (encode_json (scalar, self));
840		1589
841	void from_json (SV *jsonstr)	1590	void decode (JSON *self, SV *jsonstr)
842	PPCODE:	1591	PPCODE:
843	XPUSHs (decode_json (jsonstr, F_UTF8));	1592	XPUSHs (decode_json (jsonstr, self, 0));
844		1593
		1594	void decode_prefix (JSON *self, SV *jsonstr)
		1595	PPCODE:
		1596	{
		1597	UV offset;
		1598	EXTEND (SP, 2);
		1599	PUSHs (decode_json (jsonstr, self, &offset));
		1600	PUSHs (sv_2mortal (newSVuv (offset)));
		1601	}
		1602
		1603	void DESTROY (JSON *self)
		1604	CODE:
		1605	SvREFCNT_dec (self->cb_sk_object);
		1606	SvREFCNT_dec (self->cb_object);
		1607
		1608	PROTOTYPES: ENABLE
		1609
		1610	void encode_json (SV *scalar)
		1611	PPCODE:
		1612	{
		1613	JSON json = { F_DEFAULT | F_UTF8 };
		1614	XPUSHs (encode_json (scalar, &json));
		1615	}
		1616
		1617	void decode_json (SV *jsonstr)
		1618	PPCODE:
		1619	{
		1620	JSON json = { F_DEFAULT | F_UTF8 };
		1621	XPUSHs (decode_json (jsonstr, &json, 0));
		1622	}
		1623

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