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Comparing JSON-XS/XS.xs (file contents):
Revision 1.3 by root, Thu Mar 22 18:10:29 2007 UTC vs.
Revision 1.65 by root, Sat Oct 13 01:55:31 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
26	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
27		123
28	// structure used for encoding JSON	124	// structure used for encoding JSON
29	typedef struct	125	typedef 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	135	inline void
41	typedef struct
42	{
43	char *cur;
44	char *end;
45	char *err;
46	UV flags;
47	} dec_t;
48
49	static UV *
50	SvJSON (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
60	static void
61	need (enc_t *enc, STRLEN len)	136	need (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 = SvEND (enc->sv);	143	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
69	}	144	}
70	}	145	}
71		146
72	static void	147	inline void
73	encode_ch (enc_t *enc, char ch)	148	encode_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	}
…		…
79	static void	154	static void
80	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)
81	{	156	{
82	char *end = str + len;	157	char *end = str + len;
83		158
		159	need (enc, len);
		160
84	while (str < end)	161	while (str < end)
85	{	162	{
86	unsigned char ch = *(unsigned char *)str;	163	unsigned char ch = *(unsigned char *)str;
		164
87	if (ch >= 0x20 && ch < 0x80) // most common case	165	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
		166	{
		167	if (expect_false (ch == '"')) // but with slow exceptions
88	{	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
89	*enc->cur++ = ch;	180	*enc->cur++ = ch;
		181
90	str++;	182	++str;
91	}	183	}
92	else	184	else
93	{	185	{
94	STRLEN clen;	186	switch (ch)
95	UV uch;
96
97	if (is_utf8)
98	{
99	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);
100	if (clen < 0)
101	croak ("malformed UTF-8 character in string, cannot convert to JSON");
102	}	187	{
103	else	188	case '\010': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
104	{	189	case '\011': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
105	uch = ch;	190	case '\012': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
106	clen = 1;	191	case '\014': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
107	}	192	case '\015': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
108		193
109	need (enc, len += 6);	194	default:
110
111	if (uch < 0xa0 || enc->flags & F_ASCII)
112	{
113	if (uch > 0xFFFFUL)
114	{	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;
115	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	{
116	need (enc, len += 6);	218	need (enc, len += 11);
117	sprintf (enc->cur, "\\u%04x\\u%04x",	219	sprintf (enc->cur, "\\u%04x\\u%04x",
118	(uch - 0x10000) / 0x400 + 0xD800,	220	(int)((uch - 0x10000) / 0x400 + 0xD800),
119	(uch - 0x10000) % 0x400 + 0xDC00);	221	(int)((uch - 0x10000) % 0x400 + 0xDC00));
120	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	}
121	}	258	}
122	else
123	{
124	sprintf (enc->cur, "\\u%04x", uch);
125	enc->cur += 6;
126	}
127	}
128	else if (is_utf8)
129	{	259	}
130	memcpy (enc->cur, str, clen);
131	enc->cur += clen;
132	}
133	else
134	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
135
136	str += clen;
137	}	260	}
138		261
139	--len;	262	--len;
140	}	263	}
141	}	264	}
142		265
143	#define INDENT SB \	266	inline void
		267	encode_indent (enc_t *enc)
		268	{
144	if (enc->flags & F_INDENT) \	269	if (enc->json.flags & F_INDENT)
145	{ \	270	{
146	int i_; \	271	int spaces = enc->indent * INDENT_STEP;
147	need (enc, enc->indent); \	272
148	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);
149	encode_ch (enc, ' '); \	292	encode_ch (enc, '\n');
150	} \	293	}
151	SE	294	}
152		295
153	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	296	inline void
154	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	297	encode_comma (enc_t *enc)
155	#define COMMA SB \	298	{
156	encode_ch (enc, ','); \	299	encode_ch (enc, ',');
		300
157	if (enc->flags & F_INDENT) \	301	if (enc->json.flags & F_INDENT)
158	NL; \	302	encode_nl (enc);
159	else if (enc->flags & F_SPACE_AFTER) \	303	else if (enc->json.flags & F_SPACE_AFTER)
160	SPACE; \	304	encode_space (enc);
161	SE	305	}
162		306
163	static void encode_sv (enc_t *enc, SV *sv);	307	static void encode_sv (enc_t *enc, SV *sv);
164		308
165	static void	309	static void
166	encode_av (enc_t *enc, AV *av)	310	encode_av (enc_t *enc, AV *av)
167	{	311	{
168	int i, len = av_len (av);	312	int i, len = av_len (av);
169		313
		314	if (enc->indent >= enc->maxdepth)
		315	croak ("data structure too deep (hit recursion limit)");
		316
170	encode_ch (enc, '['); NL;	317	encode_ch (enc, '[');
171	++enc->indent;	318
		319	if (len >= 0)
		320	{
		321	encode_nl (enc); ++enc->indent;
172		322
173	for (i = 0; i <= len; ++i)	323	for (i = 0; i <= len; ++i)
174	{	324	{
175	INDENT;	325	SV **svp = av_fetch (av, i, 0);
176	encode_sv (enc, *av_fetch (av, i, 0));
177		326
		327	encode_indent (enc);
		328
		329	if (svp)
		330	encode_sv (enc, *svp);
		331	else
		332	encode_str (enc, "null", 4, 0);
		333
178	if (i < len)	334	if (i < len)
179	COMMA;	335	encode_comma (enc);
180	}	336	}
181		337
182	NL;	338	encode_nl (enc); --enc->indent; encode_indent (enc);
183		339	}
184	--enc->indent;	340
185	INDENT; encode_ch (enc, ']');	341	encode_ch (enc, ']');
186	}	342	}
187		343
188	static void	344	static void
189	encode_he (enc_t *enc, HE *he)	345	encode_hk (enc_t *enc, HE *he)
190	{	346	{
191	encode_ch (enc, '"');	347	encode_ch (enc, '"');
192		348
193	if (HeKLEN (he) == HEf_SVKEY)	349	if (HeKLEN (he) == HEf_SVKEY)
194	{	350	{
195	SV *sv = HeSVKEY (he);	351	SV *sv = HeSVKEY (he);
196	STRLEN len;	352	STRLEN len;
		353	char *str;
		354
		355	SvGETMAGIC (sv);
197	char *str = SvPV (sv, len);	356	str = SvPV (sv, len);
198		357
199	encode_str (enc, str, len, SvUTF8 (sv));	358	encode_str (enc, str, len, SvUTF8 (sv));
200	}	359	}
201	else	360	else
202	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	361	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
203		362
204	encode_ch (enc, '"');	363	encode_ch (enc, '"');
205		364
206	if (enc->flags & F_SPACE_BEFORE) SPACE;	365	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
207	encode_ch (enc, ':');	366	encode_ch (enc, ':');
208	if (enc->flags & F_SPACE_AFTER ) SPACE;	367	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
209	encode_sv (enc, HeVAL (he));
210	}	368	}
211		369
212	// compare hash entries, used when all keys are bytestrings	370	// compare hash entries, used when all keys are bytestrings
213	static int	371	static int
214	he_cmp_fast (const void *a_, const void *b_)	372	he_cmp_fast (const void *a_, const void *b_)
…		…
219	HE *b = *(HE **)b_;	377	HE *b = *(HE **)b_;
220		378
221	STRLEN la = HeKLEN (a);	379	STRLEN la = HeKLEN (a);
222	STRLEN lb = HeKLEN (b);	380	STRLEN lb = HeKLEN (b);
223		381
224	if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	382	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
225	cmp = la < lb ? -1 : la == lb ? 0 : 1;	383	cmp = lb - la;
226		384
227	return cmp;	385	return cmp;
228	}	386	}
229		387
230	// 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
231	static int	389	static int
232	he_cmp_slow (const void *a, const void *b)	390	he_cmp_slow (const void *a, const void *b)
233	{	391	{
234	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	392	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
235	}	393	}
236		394
237	static void	395	static void
238	encode_hv (enc_t *enc, HV *hv)	396	encode_hv (enc_t *enc, HV *hv)
239	{	397	{
		398	HE *he;
240	int count, i;	399	int count;
241		400
242	encode_ch (enc, '{'); NL; ++enc->indent;	401	if (enc->indent >= enc->maxdepth)
		402	croak ("data structure too deep (hit recursion limit)");
243		403
244	if ((count = hv_iterinit (hv)))	404	encode_ch (enc, '{');
245	{	405
246	// for canonical output we have to sort by keys first	406	// for canonical output we have to sort by keys first
247	// actually, this is mostly due to the stupid so-called	407	// actually, this is mostly due to the stupid so-called
248	// security workaround added somewhere in 5.8.x.	408	// security workaround added somewhere in 5.8.x.
249	// that randomises hash orderings	409	// that randomises hash orderings
250	if (enc->flags & F_CANONICAL)	410	if (enc->json.flags & F_CANONICAL)
		411	{
		412	int count = hv_iterinit (hv);
		413
		414	if (SvMAGICAL (hv))
		415	{
		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);
251	{	426	}
252	HE *he, *hes [count];	427
		428	if (count)
		429	{
253	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
254		436
255	i = 0;	437	i = 0;
256	while ((he = hv_iternext (hv)))	438	while ((he = hv_iternext (hv)))
257	{	439	{
258	hes [i++] = he;	440	hes [i++] = he;
…		…
264		446
265	if (fast)	447	if (fast)
266	qsort (hes, count, sizeof (HE *), he_cmp_fast);	448	qsort (hes, count, sizeof (HE *), he_cmp_fast);
267	else	449	else
268	{	450	{
269	// hack to disable "use bytes"	451	// hack to forcefully disable "use bytes"
270	COP *oldcop = PL_curcop, cop;	452	COP cop = *PL_curcop;
271	cop.op_private = 0;	453	cop.op_private = 0;
		454
		455	ENTER;
		456	SAVETMPS;
		457
		458	SAVEVPTR (PL_curcop);
272	PL_curcop = &cop;	459	PL_curcop = &cop;
273		460
274	SAVETMPS;
275	qsort (hes, count, sizeof (HE *), he_cmp_slow);	461	qsort (hes, count, sizeof (HE *), he_cmp_slow);
		462
276	FREETMPS;	463	FREETMPS;
		464	LEAVE;
		465	}
277		466
278	PL_curcop = oldcop;	467	encode_nl (enc); ++enc->indent;
		468
		469	while (count--)
279	}	470	{
		471	encode_indent (enc);
		472	he = hes [count];
		473	encode_hk (enc, he);
		474	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
280		475
281	for (i = 0; i < count; ++i)	476	if (count)
		477	encode_comma (enc);
		478	}
		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)))
		487	{
		488	encode_nl (enc); ++enc->indent;
		489
		490	for (;;)
282	{	491	{
283	INDENT;	492	encode_indent (enc);
284	encode_he (enc, hes [i]);	493	encode_hk (enc, he);
		494	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
285		495
286	if (i < count - 1)	496	if (!(he = hv_iternext (hv)))
287	COMMA;	497	break;
		498
		499	encode_comma (enc);
288	}	500	}
289		501
		502	encode_nl (enc); --enc->indent; encode_indent (enc);
290	NL;	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);
291	}	530	}
292	else	531	else
293	{	532	{
294	SV *sv;	533	#if 0
295	HE *he = hv_iternext (hv);	534	if (0 && sv_derived_from (rv, "JSON::Literal"))
296
297	for (;;)
298	{
299	INDENT;
300	encode_he (enc, he);
301
302	if (!(he = hv_iternext (hv)))
303	break;
304
305	COMMA;
306	}	535	{
307		536	// not yet
308	NL;
309	}	537	}
		538	#endif
		539	if (enc->json.flags & F_CONV_BLESSED)
		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))));
		578	}
		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)
310	}	585	{
		586	STRLEN len = 0;
		587	char *pv = svt ? SvPV (sv, len) : 0;
311		588
312	--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))));
313	}	600	}
314		601
315	static void	602	static void
316	encode_sv (enc_t *enc, SV *sv)	603	encode_sv (enc_t *enc, SV *sv)
317	{	604	{
		605	SvGETMAGIC (sv);
		606
318	if (SvPOKp (sv))	607	if (SvPOKp (sv))
319	{	608	{
320	STRLEN len;	609	STRLEN len;
321	char *str = SvPV (sv, len);	610	char *str = SvPV (sv, len);
322	encode_ch (enc, '"');	611	encode_ch (enc, '"');
323	encode_str (enc, str, len, SvUTF8 (sv));	612	encode_str (enc, str, len, SvUTF8 (sv));
324	encode_ch (enc, '"');	613	encode_ch (enc, '"');
325	}	614	}
326	else if (SvNOKp (sv))	615	else if (SvNOKp (sv))
327	{	616	{
		617	// trust that perl will do the right thing w.r.t. JSON syntax.
328	need (enc, NV_DIG + 32);	618	need (enc, NV_DIG + 32);
329	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	619	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
330	enc->cur += strlen (enc->cur);	620	enc->cur += strlen (enc->cur);
331	}	621	}
332	else if (SvIOKp (sv))	622	else if (SvIOKp (sv))
333	{	623	{
334	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);
335	enc->cur +=	629	enc->cur +=
336	SvIsUV(sv)	630	SvIsUV(sv)
337	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	631	? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
338	: 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	}
339	}	661	}
340	else if (SvROK (sv))	662	else if (SvROK (sv))
341	{	663	encode_rv (enc, SvRV (sv));
342	if (!--enc->max_recurse)
343	croak ("data structure too deep (hit recursion limit)");
344
345	sv = SvRV (sv);
346
347	switch (SvTYPE (sv))
348	{
349	case SVt_PVAV: encode_av (enc, (AV *)sv); break;
350	case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
351
352	default:
353	croak ("JSON can only represent references to arrays or hashes");
354	}
355	}
356	else if (!SvOK (sv))	664	else if (!SvOK (sv))
357	encode_str (enc, "null", 4, 0);	665	encode_str (enc, "null", 4, 0);
358	else	666	else
359	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));
360	}	669	}
361		670
362	static SV *	671	static SV *
363	encode_json (SV *scalar, UV flags)	672	encode_json (SV *scalar, JSON *json)
364	{	673	{
365	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))
366	croak ("hash- or arraref required (not a simple scalar, use allow_nonref to allow this)");
367
368	enc_t enc;	674	enc_t enc;
369	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;
370	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	680	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
371	enc.cur = SvPVX (enc.sv);	681	enc.cur = SvPVX (enc.sv);
372	enc.end = SvEND (enc.sv);	682	enc.end = SvEND (enc.sv);
373	enc.max_recurse = 0;
374	enc.indent = 0;	683	enc.indent = 0;
		684	enc.maxdepth = DEC_DEPTH (enc.json.flags);
375		685
376	SvPOK_only (enc.sv);	686	SvPOK_only (enc.sv);
377	encode_sv (&enc, scalar);	687	encode_sv (&enc, scalar);
378		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
379	if (!(flags & (F_ASCII | F_UTF8)))	692	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
380	SvUTF8_on (enc.sv);	693	SvUTF8_on (enc.sv);
381		694
382	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));	695	if (enc.json.flags & F_SHRINK)
		696	shrink (enc.sv);
		697
383	return enc.sv;	698	return enc.sv;
384	}	699	}
385		700
386	/////////////////////////////////////////////////////////////////////////////	701	/////////////////////////////////////////////////////////////////////////////
		702	// decoder
387		703
388	#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	{
389	for (;;) \	727	for (;;)
390	{ \	728	{
391	char ch = *dec->cur; \	729	char ch = *dec->cur;
		730
392	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	}
393	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	743	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
394	break; \	744	break; // parse error, but let higher level handle it, gives better error messages
		745
395	++dec->cur; \	746	++dec->cur;
396	}	747	}
		748	}
397		749
398	#define ERR(reason) SB dec->err = reason; goto fail; SE	750	#define ERR(reason) SB dec->err = reason; goto fail; SE
		751
399	#define EXPECT_CH(ch) SB \	752	#define EXPECT_CH(ch) SB \
400	if (*dec->cur != ch) \	753	if (*dec->cur != ch) \
401	ERR (# ch " expected"); \	754	ERR (# ch " expected"); \
402	++dec->cur; \	755	++dec->cur; \
403	SE	756	SE
404		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
405	static SV *decode_sv (dec_t *dec);	761	static SV *decode_sv (dec_t *dec);
406
407	#define APPEND_CH(ch) SB \
408	SvGROW (sv, cur + 1 + 1); \
409	SvPVX (sv)[cur++] = (ch); \
410	SE
411		762
412	static signed char decode_hexdigit[256];	763	static signed char decode_hexdigit[256];
413		764
414	static UV	765	static UV
415	decode_4hex (dec_t *dec)	766	decode_4hex (dec_t *dec)
416	{	767	{
417	signed char d1, d2, d3, d4;	768	signed char d1, d2, d3, d4;
		769	unsigned char *cur = (unsigned char *)dec->cur;
418		770
419	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");
420	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");
421	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");
422	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");
423	d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
424	if (d3 < 0) ERR ("four hexadecimal digits expected");
425	d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
426	if (d4 < 0) ERR ("four hexadecimal digits expected");
427		775
428	dec->cur += 4;	776	dec->cur += 4;
429		777
430	return ((UV)d1) << 12	778	return ((UV)d1) << 12
431	| ((UV)d2) << 8	779	| ((UV)d2) << 8
…		…
437	}	785	}
438		786
439	static SV *	787	static SV *
440	decode_str (dec_t *dec)	788	decode_str (dec_t *dec)
441	{	789	{
442	SV *sv = NEWSV (0,2);	790	SV *sv = 0;
443	STRLEN cur = 0;
444	int utf8 = 0;	791	int utf8 = 0;
		792	char *dec_cur = dec->cur;
445		793
446	for (;;)	794	do
447	{	795	{
		796	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		797	char *cur = buf;
		798
		799	do
		800	{
448	unsigned char ch = *(unsigned char *)dec->cur;	801	unsigned char ch = *(unsigned char *)dec_cur++;
449		802
450	if (ch == '"')	803	if (expect_false (ch == '"'))
		804	{
		805	--dec_cur;
451	break;	806	break;
452	else if (ch == '\\')
453	{
454	switch (*++dec->cur)
455	{	807	}
456	case '\\':	808	else if (expect_false (ch == '\\'))
457	case '/':	809	{
458	case '"': APPEND_CH (*dec->cur++); break;	810	switch (*dec_cur)
459
460	case 'b': APPEND_CH ('\010'); ++dec->cur; break;
461	case 't': APPEND_CH ('\011'); ++dec->cur; break;
462	case 'n': APPEND_CH ('\012'); ++dec->cur; break;
463	case 'f': APPEND_CH ('\014'); ++dec->cur; break;
464	case 'r': APPEND_CH ('\015'); ++dec->cur; break;
465
466	case 'u':
467	{	811	{
468	UV lo, hi;	812	case '\\':
469	++dec->cur;	813	case '/':
		814	case '"': *cur++ = *dec_cur++; break;
470		815
471	hi = decode_4hex (dec);	816	case 'b': ++dec_cur; *cur++ = '\010'; break;
472	if (hi == (UV)-1)	817	case 't': ++dec_cur; *cur++ = '\011'; break;
473	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;
474		821
475	// possibly a surrogate pair	822	case 'u':
476	if (hi >= 0xd800 && hi < 0xdc00)
477	{	823	{
478	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	824	UV lo, hi;
479	ERR ("illegal surrogate character");	825	++dec_cur;
480		826
481	dec->cur += 2;	827	dec->cur = dec_cur;
482
483	lo = decode_4hex (dec);	828	hi = decode_4hex (dec);
		829	dec_cur = dec->cur;
484	if (lo == (UV)-1)	830	if (hi == (UV)-1)
485	goto fail;	831	goto fail;
486		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
487	if (lo < 0xdc00 || lo >= 0xe000)	848	if (lo < 0xdc00 || lo >= 0xe000)
488	ERR ("surrogate pair expected");	849	ERR ("surrogate pair expected");
489		850
490	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;
491	}	864	}
492	else if (lo >= 0xdc00 && lo < 0xe000)
493	ERR ("illegal surrogate character");
494
495	if (hi >= 0x80)
496	{	865	break;
497	utf8 = 1;
498		866
499	SvGROW (sv, cur + 4 + 1); // at most 4 bytes for 21 bits
500	cur = (char *)uvuni_to_utf8_flags (SvPVX (sv) + cur, hi, 0) - SvPVX (sv);
501	}
502	else	867	default:
503	APPEND_CH (hi);	868	--dec_cur;
		869	ERR ("illegal backslash escape sequence in string");
504	}	870	}
505	break;
506	}
507	}	871	}
508	else if (ch >= 0x20 && ch <= 0x7f)	872	else if (expect_true (ch >= 0x20 && ch <= 0x7f))
509	APPEND_CH (*dec->cur++);	873	*cur++ = ch;
510	else if (ch >= 0x80)	874	else if (ch >= 0x80)
511	{	875	{
512	STRLEN clen;	876	STRLEN clen;
513	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);	877	UV uch;
514	if (clen < 0)	878
		879	--dec_cur;
		880
		881	uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		882	if (clen == (STRLEN)-1)
515	ERR ("malformed UTF-8 character in string, cannot convert to JSON");	883	ERR ("malformed UTF-8 character in JSON string");
516		884
517	SvGROW (sv, cur + clen + 1); // at most 4 bytes for 21 bits	885	do
518	memcpy (SvPVX (sv) + cur, dec->cur, clen);	886	*cur++ = *dec_cur++;
519	dec->cur += clen;	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");
		897	else
		898	ERR ("invalid character encountered while parsing JSON string");
		899	}
		900	}
		901	while (cur < buf + SHORT_STRING_LEN);
		902
		903	{
		904	STRLEN len = cur - buf;
		905
		906	if (sv)
		907	{
		908	SvGROW (sv, SvCUR (sv) + len + 1);
		909	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
		910	SvCUR_set (sv, SvCUR (sv) + len);
520	}	911	}
521	else	912	else
522	ERR ("invalid character encountered");	913	sv = newSVpvn (buf, len);
523	}	914	}
		915	}
		916	while (*dec_cur != '"');
524		917
525	++dec->cur;	918	++dec_cur;
526		919
		920	if (sv)
		921	{
527	SvPOK_only (sv);	922	SvPOK_only (sv);
528
529	SvCUR_set (sv, cur);
530	*SvEND (sv) = 0;	923	*SvEND (sv) = 0;
531		924
532	if (utf8)	925	if (utf8)
533	SvUTF8_on (sv);	926	SvUTF8_on (sv);
		927	}
		928	else
		929	sv = newSVpvn ("", 0);
534		930
		931	dec->cur = dec_cur;
535	return sv;	932	return sv;
536		933
537	fail:	934	fail:
538	SvREFCNT_dec (sv);	935	dec->cur = dec_cur;
539	return 0;	936	return 0;
540	}	937	}
541		938
542	static SV *	939	static SV *
543	decode_num (dec_t *dec)	940	decode_num (dec_t *dec)
…		…
553	{	950	{
554	++dec->cur;	951	++dec->cur;
555	if (*dec->cur >= '0' && *dec->cur <= '9')	952	if (*dec->cur >= '0' && *dec->cur <= '9')
556	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)");
557	}	954	}
558		955	else if (*dec->cur < '0' || *dec->cur > '9')
559	// int	956	ERR ("malformed number (no digits after initial minus)");
		957	else
		958	do
		959	{
		960	++dec->cur;
		961	}
560	while (*dec->cur >= '0' && *dec->cur <= '9')	962	while (*dec->cur >= '0' && *dec->cur <= '9');
561	++dec->cur;
562		963
563	// [frac]	964	// [frac]
564	if (*dec->cur == '.')	965	if (*dec->cur == '.')
565	{	966	{
		967	++dec->cur;
		968
		969	if (*dec->cur < '0' || *dec->cur > '9')
		970	ERR ("malformed number (no digits after decimal point)");
		971
		972	do
		973	{
		974	++dec->cur;
		975	}
		976	while (*dec->cur >= '0' && *dec->cur <= '9');
		977
566	is_nv = 1;	978	is_nv = 1;
567
568	do
569	{
570	++dec->cur;
571	}
572	while (*dec->cur >= '0' && *dec->cur <= '9');
573	}	979	}
574		980
575	// [exp]	981	// [exp]
576	if (*dec->cur == 'e' || *dec->cur == 'E')	982	if (*dec->cur == 'e' || *dec->cur == 'E')
577	{	983	{
578	is_nv = 1;
579
580	++dec->cur;	984	++dec->cur;
		985
581	if (*dec->cur == '-' || *dec->cur == '+')	986	if (*dec->cur == '-' || *dec->cur == '+')
582	++dec->cur;	987	++dec->cur;
583		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	}
584	while (*dec->cur >= '0' && *dec->cur <= '9')	996	while (*dec->cur >= '0' && *dec->cur <= '9');
585	++dec->cur;	997
		998	is_nv = 1;
586	}	999	}
587		1000
588	if (!is_nv)	1001	if (!is_nv)
589	{	1002	{
590	UV uv;	1003	int len = dec->cur - start;
591	int numtype = grok_number (start, dec->cur - start, &uv);	1004
592	if (numtype & IS_NUMBER_IN_UV)	1005	// special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
593	if (numtype & IS_NUMBER_NEG)	1006	if (*start == '-')
		1007	switch (len)
594	{	1008	{
595	if (uv < (UV)IV_MIN)	1009	case 2: return newSViv (-( start [1] - '0' * 1));
596	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));
597	}	1013	}
		1014	else
		1015	switch (len)
		1016	{
		1017	case 1: return newSViv ( start [0] - '0' * 1);
		1018	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1019	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1020	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1021	}
		1022
		1023	{
		1024	UV uv;
		1025	int numtype = grok_number (start, len, &uv);
		1026	if (numtype & IS_NUMBER_IN_UV)
		1027	if (numtype & IS_NUMBER_NEG)
		1028	{
		1029	if (uv < (UV)IV_MIN)
		1030	return newSViv (-(IV)uv);
		1031	}
598	else	1032	else
599	return newSVuv (uv);	1033	return newSVuv (uv);
600	}	1034	}
601		1035
		1036	len -= *start == '-' ? 1 : 0;
		1037
		1038	// does not fit into IV or UV, try NV
		1039	if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len)
		1040	#if defined (LDBL_DIG)
		1041	|| (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len)
		1042	#endif
		1043	)
		1044	// fits into NV without loss of precision
		1045	return newSVnv (Atof (start));
		1046
		1047	// everything else fails, convert it to a string
		1048	return newSVpvn (start, dec->cur - start);
		1049	}
		1050
		1051	// loss of precision here
602	return newSVnv (Atof (start));	1052	return newSVnv (Atof (start));
603		1053
604	fail:	1054	fail:
605	return 0;	1055	return 0;
606	}	1056	}
…		…
608	static SV *	1058	static SV *
609	decode_av (dec_t *dec)	1059	decode_av (dec_t *dec)
610	{	1060	{
611	AV *av = newAV ();	1061	AV *av = newAV ();
612		1062
		1063	DEC_INC_DEPTH;
		1064	decode_ws (dec);
		1065
		1066	if (*dec->cur == ']')
		1067	++dec->cur;
		1068	else
613	for (;;)	1069	for (;;)
614	{	1070	{
615	SV *value;	1071	SV *value;
616		1072
617	value = decode_sv (dec);	1073	value = decode_sv (dec);
618	if (!value)	1074	if (!value)
619	goto fail;	1075	goto fail;
620		1076
621	av_push (av, value);	1077	av_push (av, value);
622		1078
623	WS;	1079	decode_ws (dec);
624		1080
625	if (*dec->cur == ']')	1081	if (*dec->cur == ']')
626	{	1082	{
627	++dec->cur;	1083	++dec->cur;
628	break;	1084	break;
		1085	}
629	}	1086
630
631	if (*dec->cur != ',')	1087	if (*dec->cur != ',')
632	ERR (", or ] expected while parsing array");	1088	ERR (", or ] expected while parsing array");
633		1089
634	++dec->cur;	1090	++dec->cur;
		1091
		1092	decode_ws (dec);
		1093
		1094	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1095	{
		1096	++dec->cur;
		1097	break;
		1098	}
635	}	1099	}
636		1100
		1101	DEC_DEC_DEPTH;
637	return newRV_noinc ((SV *)av);	1102	return newRV_noinc ((SV *)av);
638		1103
639	fail:	1104	fail:
640	SvREFCNT_dec (av);	1105	SvREFCNT_dec (av);
		1106	DEC_DEC_DEPTH;
641	return 0;	1107	return 0;
642	}	1108	}
643		1109
644	static SV *	1110	static SV *
645	decode_hv (dec_t *dec)	1111	decode_hv (dec_t *dec)
646	{	1112	{
		1113	SV *sv;
647	HV *hv = newHV ();	1114	HV *hv = newHV ();
648		1115
		1116	DEC_INC_DEPTH;
		1117	decode_ws (dec);
		1118
		1119	if (*dec->cur == '}')
		1120	++dec->cur;
		1121	else
649	for (;;)	1122	for (;;)
650	{	1123	{
651	SV *key, *value;
652
653	WS; EXPECT_CH ('"');	1124	EXPECT_CH ('"');
654		1125
655	key = decode_str (dec);	1126	// heuristic: assume that
656	if (!key)	1127	// a) decode_str + hv_store_ent are abysmally slow.
657	goto fail;	1128	// b) most hash keys are short, simple ascii text.
658		1129	// => try to "fast-match" such strings to avoid
659	WS; EXPECT_CH (':');	1130	// the overhead of decode_str + hv_store_ent.
660
661	value = decode_sv (dec);
662	if (!value)
663	{
664	SvREFCNT_dec (key);
665	goto fail;
666	}	1131	{
		1132	SV *value;
		1133	char *p = dec->cur;
		1134	char *e = p + 24; // only try up to 24 bytes
667		1135
668	//TODO: optimise	1136	for (;;)
		1137	{
		1138	// the >= 0x80 is true on most architectures
		1139	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1140	{
		1141	// slow path, back up and use decode_str
		1142	SV *key = decode_str (dec);
		1143	if (!key)
		1144	goto fail;
		1145
		1146	decode_ws (dec); EXPECT_CH (':');
		1147
		1148	decode_ws (dec);
		1149	value = decode_sv (dec);
		1150	if (!value)
		1151	{
		1152	SvREFCNT_dec (key);
		1153	goto fail;
		1154	}
		1155
669	hv_store_ent (hv, key, value, 0);	1156	hv_store_ent (hv, key, value, 0);
		1157	SvREFCNT_dec (key);
670		1158
671	WS;	1159	break;
		1160	}
		1161	else if (*p == '"')
		1162	{
		1163	// fast path, got a simple key
		1164	char *key = dec->cur;
		1165	int len = p - key;
		1166	dec->cur = p + 1;
672		1167
		1168	decode_ws (dec); EXPECT_CH (':');
		1169
		1170	decode_ws (dec);
		1171	value = decode_sv (dec);
		1172	if (!value)
		1173	goto fail;
		1174
		1175	hv_store (hv, key, len, value, 0);
		1176
		1177	break;
		1178	}
		1179
		1180	++p;
		1181	}
		1182	}
		1183
		1184	decode_ws (dec);
		1185
673	if (*dec->cur == '}')	1186	if (*dec->cur == '}')
674	{	1187	{
675	++dec->cur;	1188	++dec->cur;
676	break;	1189	break;
677	}	1190	}
678		1191
679	if (*dec->cur != ',')	1192	if (*dec->cur != ',')
680	ERR (", or } expected while parsing object/hash");	1193	ERR (", or } expected while parsing object/hash");
681		1194
682	++dec->cur;	1195	++dec->cur;
		1196
		1197	decode_ws (dec);
		1198
		1199	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1200	{
		1201	++dec->cur;
		1202	break;
		1203	}
683	}	1204	}
684		1205
		1206	DEC_DEC_DEPTH;
685	return newRV_noinc ((SV *)hv);	1207	sv = newRV_noinc ((SV *)hv);
		1208
		1209	// check filter callbacks
		1210	if (dec->json.flags & F_HOOK)
		1211	{
		1212	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1213	{
		1214	HE *cb, *he;
		1215
		1216	hv_iterinit (hv);
		1217	he = hv_iternext (hv);
		1218	hv_iterinit (hv);
		1219
		1220	// the next line creates a mortal sv each time its called.
		1221	// might want to optimise this for common cases.
		1222	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1223
		1224	if (cb)
		1225	{
		1226	dSP;
		1227	int count;
		1228
		1229	ENTER; SAVETMPS; PUSHMARK (SP);
		1230	XPUSHs (HeVAL (he));
		1231
		1232	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1233
		1234	if (count == 1)
		1235	{
		1236	sv = newSVsv (POPs);
		1237	FREETMPS; LEAVE;
		1238	return sv;
		1239	}
		1240
		1241	FREETMPS; LEAVE;
		1242	}
		1243	}
		1244
		1245	if (dec->json.cb_object)
		1246	{
		1247	dSP;
		1248	int count;
		1249
		1250	ENTER; SAVETMPS; PUSHMARK (SP);
		1251	XPUSHs (sv_2mortal (sv));
		1252
		1253	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1254
		1255	if (count == 1)
		1256	{
		1257	sv = newSVsv (POPs);
		1258	FREETMPS; LEAVE;
		1259	return sv;
		1260	}
		1261
		1262	SvREFCNT_inc (sv);
		1263	FREETMPS; LEAVE;
		1264	}
		1265	}
		1266
		1267	return sv;
686		1268
687	fail:	1269	fail:
688	SvREFCNT_dec (hv);	1270	SvREFCNT_dec (hv);
		1271	DEC_DEC_DEPTH;
689	return 0;	1272	return 0;
690	}	1273	}
691		1274
692	static SV *	1275	static SV *
693	decode_sv (dec_t *dec)	1276	decode_sv (dec_t *dec)
694	{	1277	{
695	WS;	1278	// the beauty of JSON: you need exactly one character lookahead
		1279	// to parse anything.
696	switch (*dec->cur)	1280	switch (*dec->cur)
697	{	1281	{
698	case '"': ++dec->cur; return decode_str (dec);	1282	case '"': ++dec->cur; return decode_str (dec);
699	case '[': ++dec->cur; return decode_av (dec);	1283	case '[': ++dec->cur; return decode_av (dec);
700	case '{': ++dec->cur; return decode_hv (dec);	1284	case '{': ++dec->cur; return decode_hv (dec);
…		…
706		1290
707	case 't':	1291	case 't':
708	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1292	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
709	{	1293	{
710	dec->cur += 4;	1294	dec->cur += 4;
711	return newSViv (1);	1295	#if JSON_SLOW
		1296	json_true = get_sv ("JSON::XS::true", 1); SvREADONLY_on (json_true);
		1297	#endif
		1298	return SvREFCNT_inc (json_true);
712	}	1299	}
713	else	1300	else
714	ERR ("'true' expected");	1301	ERR ("'true' expected");
715		1302
716	break;	1303	break;
717		1304
718	case 'f':	1305	case 'f':
719	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1306	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
720	{	1307	{
721	dec->cur += 5;	1308	dec->cur += 5;
722	return newSViv (0);	1309	#if JSON_SLOW
		1310	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1311	#endif
		1312	return SvREFCNT_inc (json_false);
723	}	1313	}
724	else	1314	else
725	ERR ("'false' expected");	1315	ERR ("'false' expected");
726		1316
727	break;	1317	break;
728		1318
729	case 'n':	1319	case 'n':
730	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))	1320	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))
731	{	1321	{
732	dec->cur += 4;	1322	dec->cur += 4;
733	return newSViv (1);	1323	return newSVsv (&PL_sv_undef);
734	}	1324	}
735	else	1325	else
736	ERR ("'null' expected");	1326	ERR ("'null' expected");
737		1327
738	break;	1328	break;
739		1329
740	default:	1330	default:
741	ERR ("malformed json string");	1331	ERR ("malformed JSON string, neither array, object, number, string or atom");
742	break;	1332	break;
743	}	1333	}
744		1334
745	fail:	1335	fail:
746	return 0;	1336	return 0;
747	}	1337	}
748		1338
749	static SV *	1339	static SV *
750	decode_json (SV *string, UV flags)	1340	decode_json (SV *string, JSON *json, UV *offset_return)
751	{	1341	{
		1342	dec_t dec;
		1343	UV offset;
752	SV *sv;	1344	SV *sv;
753		1345
		1346	SvGETMAGIC (string);
		1347	SvUPGRADE (string, SVt_PV);
		1348
		1349	if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
		1350	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1351	(unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
		1352
754	if (!(flags & F_UTF8))	1353	if (json->flags & F_UTF8)
		1354	sv_utf8_downgrade (string, 0);
		1355	else
755	sv_utf8_upgrade (string);	1356	sv_utf8_upgrade (string);
756		1357
757	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1358	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
758		1359
759	dec_t dec;	1360	dec.json = *json;
760	dec.flags = flags;
761	dec.cur = SvPVX (string);	1361	dec.cur = SvPVX (string);
762	dec.end = SvEND (string);	1362	dec.end = SvEND (string);
763	dec.err = 0;	1363	dec.err = 0;
		1364	dec.depth = 0;
		1365	dec.maxdepth = DEC_DEPTH (dec.json.flags);
764		1366
765	*dec.end = 1; // invalid anywhere	1367	if (dec.json.cb_object || dec.json.cb_sk_object)
		1368	dec.json.flags |= F_HOOK;
		1369
		1370	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1371
		1372	decode_ws (&dec);
766	sv = decode_sv (&dec);	1373	sv = decode_sv (&dec);
767	*dec.end = 0;	1374
		1375	if (!(offset_return || !sv))
		1376	{
		1377	// check for trailing garbage
		1378	decode_ws (&dec);
		1379
		1380	if (*dec.cur)
		1381	{
		1382	dec.err = "garbage after JSON object";
		1383	SvREFCNT_dec (sv);
		1384	sv = 0;
		1385	}
		1386	}
		1387
		1388	if (offset_return || !sv)
		1389	{
		1390	offset = dec.json.flags & F_UTF8
		1391	? dec.cur - SvPVX (string)
		1392	: utf8_distance (dec.cur, SvPVX (string));
		1393
		1394	if (offset_return)
		1395	*offset_return = offset;
		1396	}
768		1397
769	if (!sv)	1398	if (!sv)
770	{	1399	{
771	IV offset = utf8_distance (dec.cur, SvPVX (string));
772	SV *uni = sv_newmortal ();	1400	SV *uni = sv_newmortal ();
773		1401
		1402	// horrible hack to silence warning inside pv_uni_display
		1403	COP cop = *PL_curcop;
		1404	cop.cop_warnings = pWARN_NONE;
		1405	ENTER;
		1406	SAVEVPTR (PL_curcop);
		1407	PL_curcop = &cop;
774	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1408	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
		1409	LEAVE;
		1410
775	croak ("%s, at character %d (%s)",	1411	croak ("%s, at character offset %d [\"%s\"]",
776	dec.err,	1412	dec.err,
777	(int)offset,	1413	(int)offset,
778	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1414	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
779	}	1415	}
780		1416
781	sv = sv_2mortal (sv);	1417	sv = sv_2mortal (sv);
782		1418
783	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1419	if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
784	croak ("JSON object or array expected (but number, string, true, false or null found, use allow_nonref to allow this)");	1420	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
785		1421
786	return sv;	1422	return sv;
787	}	1423	}
788		1424
		1425	/////////////////////////////////////////////////////////////////////////////
		1426	// XS interface functions
		1427
789	MODULE = JSON::XS PACKAGE = JSON::XS	1428	MODULE = JSON::XS PACKAGE = JSON::XS
790		1429
791	BOOT:	1430	BOOT:
792	{	1431	{
793	int i;	1432	int i;
794		1433
795	memset (decode_hexdigit, 0xff, 256);
796	for (i = 10; i--; )	1434	for (i = 0; i < 256; ++i)
797	decode_hexdigit ['0' + i] = i;	1435	decode_hexdigit [i] =
		1436	i >= '0' && i <= '9' ? i - '0'
		1437	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1438	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1439	: -1;
798		1440
799	for (i = 6; --i; )	1441	json_stash = gv_stashpv ("JSON::XS" , 1);
		1442	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1443
		1444	json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
		1445	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1446	}
		1447
		1448	PROTOTYPES: DISABLE
		1449
		1450	void CLONE (...)
		1451	CODE:
		1452	json_stash = 0;
		1453	json_boolean_stash = 0;
		1454
		1455	void new (char *klass)
		1456	PPCODE:
		1457	{
		1458	SV *pv = NEWSV (0, sizeof (JSON));
		1459	SvPOK_only (pv);
		1460	Zero (SvPVX (pv), 1, JSON);
		1461	((JSON *)SvPVX (pv))->flags = F_DEFAULT;
		1462	XPUSHs (sv_2mortal (sv_bless (newRV_noinc (pv), JSON_STASH)));
		1463	}
		1464
		1465	void ascii (JSON *self, int enable = 1)
		1466	ALIAS:
		1467	ascii = F_ASCII
		1468	latin1 = F_LATIN1
		1469	utf8 = F_UTF8
		1470	indent = F_INDENT
		1471	canonical = F_CANONICAL
		1472	space_before = F_SPACE_BEFORE
		1473	space_after = F_SPACE_AFTER
		1474	pretty = F_PRETTY
		1475	allow_nonref = F_ALLOW_NONREF
		1476	shrink = F_SHRINK
		1477	allow_blessed = F_ALLOW_BLESSED
		1478	convert_blessed = F_CONV_BLESSED
		1479	relaxed = F_RELAXED
		1480	PPCODE:
		1481	{
		1482	if (enable)
		1483	self->flags |= ix;
		1484	else
		1485	self->flags &= ~ix;
		1486
		1487	XPUSHs (ST (0));
		1488	}
		1489
		1490	void max_depth (JSON *self, UV max_depth = 0x80000000UL)
		1491	PPCODE:
		1492	{
		1493	UV log2 = 0;
		1494
		1495	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
		1496
		1497	while ((1UL << log2) < max_depth)
		1498	++log2;
		1499
		1500	self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
		1501
		1502	XPUSHs (ST (0));
		1503	}
		1504
		1505	void max_size (JSON *self, UV max_size = 0)
		1506	PPCODE:
		1507	{
		1508	UV log2 = 0;
		1509
		1510	if (max_size > 0x80000000UL) max_size = 0x80000000UL;
		1511	if (max_size == 1) max_size = 2;
		1512
		1513	while ((1UL << log2) < max_size)
		1514	++log2;
		1515
		1516	self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
		1517
		1518	XPUSHs (ST (0));
		1519	}
		1520
		1521	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
		1522	PPCODE:
		1523	{
		1524	SvREFCNT_dec (self->cb_object);
		1525	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
		1526
		1527	XPUSHs (ST (0));
		1528	}
		1529
		1530	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
		1531	PPCODE:
		1532	{
		1533	if (!self->cb_sk_object)
		1534	self->cb_sk_object = newHV ();
		1535
		1536	if (SvOK (cb))
		1537	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1538	else
800	{	1539	{
801	decode_hexdigit ['a' + i] = 10 + i;	1540	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
802	decode_hexdigit ['A' + i] = 10 + i;	1541
		1542	if (!HvKEYS (self->cb_sk_object))
		1543	{
		1544	SvREFCNT_dec (self->cb_sk_object);
		1545	self->cb_sk_object = 0;
		1546	}
803	}	1547	}
804		1548
805	json_stash = gv_stashpv ("JSON::XS", 1);	1549	XPUSHs (ST (0));
806	}	1550	}
807		1551
808	SV *new (char *dummy)	1552	void encode (JSON *self, SV *scalar)
		1553	PPCODE:
		1554	XPUSHs (encode_json (scalar, self));
		1555
		1556	void decode (JSON *self, SV *jsonstr)
		1557	PPCODE:
		1558	XPUSHs (decode_json (jsonstr, self, 0));
		1559
		1560	void decode_prefix (JSON *self, SV *jsonstr)
		1561	PPCODE:
		1562	{
		1563	UV offset;
		1564	EXTEND (SP, 2);
		1565	PUSHs (decode_json (jsonstr, self, &offset));
		1566	PUSHs (sv_2mortal (newSVuv (offset)));
		1567	}
		1568
		1569	void DESTROY (JSON *self)
809	CODE:	1570	CODE:
810	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1571	SvREFCNT_dec (self->cb_sk_object);
811	OUTPUT:	1572	SvREFCNT_dec (self->cb_object);
812	RETVAL
813		1573
814	SV *ascii (SV *self, int enable)	1574	PROTOTYPES: ENABLE
815	ALIAS:
816	ascii = F_ASCII
817	utf8 = F_UTF8
818	indent = F_INDENT
819	canonical = F_CANONICAL
820	space_before = F_SPACE_BEFORE
821	space_after = F_SPACE_AFTER
822	json_rpc = F_JSON_RPC
823	pretty = F_PRETTY
824	allow_nonref = F_ALLOW_NONREF
825	CODE:
826	{
827	UV *uv = SvJSON (self);
828	if (enable)
829	*uv |= ix;
830	else
831	*uv &= ~ix;
832
833	RETVAL = newSVsv (self);
834	}
835	OUTPUT:
836	RETVAL
837
838	void encode (SV *self, SV *scalar)
839	PPCODE:
840	XPUSHs (encode_json (scalar, *SvJSON (self)));
841
842	void decode (SV *self, SV *jsonstr)
843	PPCODE:
844	XPUSHs (decode_json (jsonstr, *SvJSON (self)));
845		1575
846	void to_json (SV *scalar)	1576	void to_json (SV *scalar)
847	PPCODE:	1577	PPCODE:
		1578	{
		1579	JSON json = { F_DEFAULT | F_UTF8 };
848	XPUSHs (encode_json (scalar, F_UTF8));	1580	XPUSHs (encode_json (scalar, &json));
		1581	}
849		1582
850	void from_json (SV *jsonstr)	1583	void from_json (SV *jsonstr)
851	PPCODE:	1584	PPCODE:
		1585	{
		1586	JSON json = { F_DEFAULT | F_UTF8 };
852	XPUSHs (decode_json (jsonstr, F_UTF8));	1587	XPUSHs (decode_json (jsonstr, &json, 0));
		1588	}
853		1589

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