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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 1.56 by root, Thu Jul 26 11:33:35 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_MAXDEPTH 0xf8000000UL
		33	#define S_MAXDEPTH 27
		34	#define F_MAXSIZE 0x01f00000UL
		35	#define S_MAXSIZE 20
		36	#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
		37
		38	#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
		39	#define DEC_SIZE(flags) (1UL << ((flags & F_MAXSIZE ) >> S_MAXSIZE ))
17		40
18	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	41	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
19	#define F_DEFAULT 0	42	#define F_DEFAULT (9UL << S_MAXDEPTH)
20		43
21	#define INIT_SIZE 32 // initial scalar size to be allocated	44	#define INIT_SIZE 32 // initial scalar size to be allocated
		45	#define INDENT_STEP 3 // spaces per indentation level
		46
		47	#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
22		48
23	#define SB do {	49	#define SB do {
24	#define SE } while (0)	50	#define SE } while (0)
25		51
26	static HV *json_stash;	52	#if __GNUC__ >= 3
		53	# define expect(expr,value) __builtin_expect ((expr),(value))
		54	# define inline inline
		55	#else
		56	# define expect(expr,value) (expr)
		57	# define inline static
		58	#endif
		59
		60	#define expect_false(expr) expect ((expr) != 0, 0)
		61	#define expect_true(expr) expect ((expr) != 0, 1)
		62
		63	static HV *json_stash, *json_boolean_stash; // JSON::XS::
		64	static SV *json_true, *json_false;
		65
		66	typedef struct {
		67	U32 flags;
		68	SV *cb_object;
		69	HV *cb_sk_object;
		70	} JSON;
		71
		72	/////////////////////////////////////////////////////////////////////////////
		73	// utility functions
		74
		75	inline void
		76	shrink (SV *sv)
		77	{
		78	sv_utf8_downgrade (sv, 1);
		79	if (SvLEN (sv) > SvCUR (sv) + 1)
		80	{
		81	#ifdef SvPV_shrink_to_cur
		82	SvPV_shrink_to_cur (sv);
		83	#elif defined (SvPV_renew)
		84	SvPV_renew (sv, SvCUR (sv) + 1);
		85	#endif
		86	}
		87	}
		88
		89	// decode an utf-8 character and return it, or (UV)-1 in
		90	// case of an error.
		91	// we special-case "safe" characters from U+80 .. U+7FF,
		92	// but use the very good perl function to parse anything else.
		93	// note that we never call this function for a ascii codepoints
		94	inline UV
		95	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
		96	{
		97	if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
		98	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		99	else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
		100	{
		101	*clen = 2;
		102	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
		103	}
		104	else
		105	{
		106	*clen = (STRLEN)-1;
		107	return (UV)-1;
		108	}
		109	}
		110
		111	/////////////////////////////////////////////////////////////////////////////
		112	// encoder
27		113
28	// structure used for encoding JSON	114	// structure used for encoding JSON
29	typedef struct	115	typedef struct
30	{	116	{
31	char *cur;	117	char *cur; // SvPVX (sv) + current output position
32	STRLEN len; // SvLEN (sv)
33	char *end; // SvEND (sv)	118	char *end; // SvEND (sv)
34	SV *sv;	119	SV *sv; // result scalar
35	UV flags;	120	JSON json;
36	int max_recurse;	121	U32 indent; // indentation level
37	int indent;	122	U32 maxdepth; // max. indentation/recursion level
38	} enc_t;	123	} enc_t;
39		124
40	// structure used for decoding JSON	125	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)	126	need (enc_t *enc, STRLEN len)
62	{	127	{
63	if (enc->cur + len >= enc->end)	128	if (expect_false (enc->cur + len >= enc->end))
64	{	129	{
65	STRLEN cur = enc->cur - SvPVX (enc->sv);	130	STRLEN cur = enc->cur - SvPVX (enc->sv);
66	SvGROW (enc->sv, cur + len + 1);	131	SvGROW (enc->sv, cur + len + 1);
67	enc->cur = SvPVX (enc->sv) + cur;	132	enc->cur = SvPVX (enc->sv) + cur;
68	enc->end = SvEND (enc->sv);	133	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
69	}	134	}
70	}	135	}
71		136
72	static void	137	inline void
73	encode_ch (enc_t *enc, char ch)	138	encode_ch (enc_t *enc, char ch)
74	{	139	{
75	need (enc, 1);	140	need (enc, 1);
76	*enc->cur++ = ch;	141	*enc->cur++ = ch;
77	}	142	}
…		…
79	static void	144	static void
80	encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8)	145	encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8)
81	{	146	{
82	char *end = str + len;	147	char *end = str + len;
83		148
		149	need (enc, len);
		150
84	while (str < end)	151	while (str < end)
85	{	152	{
86	unsigned char ch = *(unsigned char *)str;	153	unsigned char ch = *(unsigned char *)str;
		154
87	if (ch >= 0x20 && ch < 0x80) // most common case	155	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
88	{	156	{
		157	if (expect_false (ch == '"')) // but with slow exceptions
		158	{
		159	need (enc, len += 1);
		160	*enc->cur++ = '\\';
		161	*enc->cur++ = '"';
		162	}
		163	else if (expect_false (ch == '\\'))
		164	{
		165	need (enc, len += 1);
		166	*enc->cur++ = '\\';
		167	*enc->cur++ = '\\';
		168	}
		169	else
89	*enc->cur++ = ch;	170	*enc->cur++ = ch;
		171
90	str++;	172	++str;
91	}	173	}
92	else	174	else
93	{	175	{
94	STRLEN clen;	176	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	}	177	{
103	else	178	case '\010': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
104	{	179	case '\011': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
105	uch = ch;	180	case '\012': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
106	clen = 1;	181	case '\014': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
107	}	182	case '\015': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
108		183
109	need (enc, len += 6);	184	default:
110
111	if (uch < 0xa0 || enc->flags & F_ASCII)
112	{
113	if (uch > 0xFFFFUL)
114	{	185	{
		186	STRLEN clen;
		187	UV uch;
		188
		189	if (is_utf8)
		190	{
		191	uch = decode_utf8 (str, end - str, &clen);
		192	if (clen == (STRLEN)-1)
		193	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
		194	}
		195	else
		196	{
		197	uch = ch;
115	len += 6;	198	clen = 1;
		199	}
		200
		201	if (uch > 0x10FFFFUL)
		202	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		203
		204	if (uch < 0x80 || enc->json.flags & F_ASCII || (enc->json.flags & F_LATIN1 && uch > 0xFF))
		205	{
		206	if (uch > 0xFFFFUL)
		207	{
116	need (enc, len += 6);	208	need (enc, len += 11);
117	sprintf (enc->cur, "\\u%04x\\u%04x",	209	sprintf (enc->cur, "\\u%04x\\u%04x",
118	(uch - 0x10000) / 0x400 + 0xD800,	210	(int)((uch - 0x10000) / 0x400 + 0xD800),
119	(uch - 0x10000) % 0x400 + 0xDC00);	211	(int)((uch - 0x10000) % 0x400 + 0xDC00));
120	enc->cur += 12;	212	enc->cur += 12;
		213	}
		214	else
		215	{
		216	static char hexdigit [16] = "0123456789abcdef";
		217	need (enc, len += 5);
		218	*enc->cur++ = '\\';
		219	*enc->cur++ = 'u';
		220	*enc->cur++ = hexdigit [ uch >> 12 ];
		221	*enc->cur++ = hexdigit [(uch >> 8) & 15];
		222	*enc->cur++ = hexdigit [(uch >> 4) & 15];
		223	*enc->cur++ = hexdigit [(uch >> 0) & 15];
		224	}
		225
		226	str += clen;
		227	}
		228	else if (enc->json.flags & F_LATIN1)
		229	{
		230	*enc->cur++ = uch;
		231	str += clen;
		232	}
		233	else if (is_utf8)
		234	{
		235	need (enc, len += clen);
		236	do
		237	{
		238	*enc->cur++ = *str++;
		239	}
		240	while (--clen);
		241	}
		242	else
		243	{
		244	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
		245	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
		246	++str;
		247	}
121	}	248	}
122	else
123	{
124	sprintf (enc->cur, "\\u%04x", uch);
125	enc->cur += 6;
126	}
127	}
128	else if (is_utf8)
129	{	249	}
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	}	250	}
138		251
139	--len;	252	--len;
140	}	253	}
141	}	254	}
142		255
143	#define INDENT SB \	256	inline void
		257	encode_indent (enc_t *enc)
		258	{
144	if (enc->flags & F_INDENT) \	259	if (enc->json.flags & F_INDENT)
145	{ \	260	{
146	int i_; \	261	int spaces = enc->indent * INDENT_STEP;
147	need (enc, enc->indent); \	262
148	for (i_ = enc->indent * 3; i_--; )\	263	need (enc, spaces);
		264	memset (enc->cur, ' ', spaces);
		265	enc->cur += spaces;
		266	}
		267	}
		268
		269	inline void
		270	encode_space (enc_t *enc)
		271	{
		272	need (enc, 1);
		273	encode_ch (enc, ' ');
		274	}
		275
		276	inline void
		277	encode_nl (enc_t *enc)
		278	{
		279	if (enc->json.flags & F_INDENT)
		280	{
		281	need (enc, 1);
149	encode_ch (enc, ' '); \	282	encode_ch (enc, '\n');
150	} \	283	}
151	SE	284	}
152		285
153	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	286	inline void
154	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	287	encode_comma (enc_t *enc)
155	#define COMMA SB \	288	{
156	encode_ch (enc, ','); \	289	encode_ch (enc, ',');
		290
157	if (enc->flags & F_INDENT) \	291	if (enc->json.flags & F_INDENT)
158	NL; \	292	encode_nl (enc);
159	else if (enc->flags & F_SPACE_AFTER) \	293	else if (enc->json.flags & F_SPACE_AFTER)
160	SPACE; \	294	encode_space (enc);
161	SE	295	}
162		296
163	static void encode_sv (enc_t *enc, SV *sv);	297	static void encode_sv (enc_t *enc, SV *sv);
164		298
165	static void	299	static void
166	encode_av (enc_t *enc, AV *av)	300	encode_av (enc_t *enc, AV *av)
167	{	301	{
168	int i, len = av_len (av);	302	int i, len = av_len (av);
169		303
170	encode_ch (enc, '['); NL;	304	if (enc->indent >= enc->maxdepth)
		305	croak ("data structure too deep (hit recursion limit)");
		306
		307	encode_ch (enc, '['); encode_nl (enc);
171	++enc->indent;	308	++enc->indent;
172		309
173	for (i = 0; i <= len; ++i)	310	for (i = 0; i <= len; ++i)
174	{	311	{
175	INDENT;	312	SV **svp = av_fetch (av, i, 0);
176	encode_sv (enc, *av_fetch (av, i, 0));	313
		314	encode_indent (enc);
		315
		316	if (svp)
		317	encode_sv (enc, *svp);
		318	else
		319	encode_str (enc, "null", 4, 0);
177		320
178	if (i < len)	321	if (i < len)
179	COMMA;	322	encode_comma (enc);
180	}	323	}
181		324
182	NL;	325	encode_nl (enc);
183		326
184	--enc->indent;	327	--enc->indent;
185	INDENT; encode_ch (enc, ']');	328	encode_indent (enc); encode_ch (enc, ']');
186	}	329	}
187		330
188	static void	331	static void
189	encode_he (enc_t *enc, HE *he)	332	encode_he (enc_t *enc, HE *he)
190	{	333	{
…		…
192		335
193	if (HeKLEN (he) == HEf_SVKEY)	336	if (HeKLEN (he) == HEf_SVKEY)
194	{	337	{
195	SV *sv = HeSVKEY (he);	338	SV *sv = HeSVKEY (he);
196	STRLEN len;	339	STRLEN len;
		340	char *str;
		341
		342	SvGETMAGIC (sv);
197	char *str = SvPV (sv, len);	343	str = SvPV (sv, len);
198		344
199	encode_str (enc, str, len, SvUTF8 (sv));	345	encode_str (enc, str, len, SvUTF8 (sv));
200	}	346	}
201	else	347	else
202	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	348	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
203		349
204	encode_ch (enc, '"');	350	encode_ch (enc, '"');
205		351
206	if (enc->flags & F_SPACE_BEFORE) SPACE;	352	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
207	encode_ch (enc, ':');	353	encode_ch (enc, ':');
208	if (enc->flags & F_SPACE_AFTER ) SPACE;	354	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
209	encode_sv (enc, HeVAL (he));	355	encode_sv (enc, HeVAL (he));
210	}	356	}
211		357
212	// compare hash entries, used when all keys are bytestrings	358	// compare hash entries, used when all keys are bytestrings
213	static int	359	static int
…		…
219	HE *b = *(HE **)b_;	365	HE *b = *(HE **)b_;
220		366
221	STRLEN la = HeKLEN (a);	367	STRLEN la = HeKLEN (a);
222	STRLEN lb = HeKLEN (b);	368	STRLEN lb = HeKLEN (b);
223		369
224	if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	370	if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))
225	cmp = la < lb ? -1 : la == lb ? 0 : 1;	371	cmp = la - lb;
226		372
227	return cmp;	373	return cmp;
228	}	374	}
229		375
230	// compare hash entries, used when some keys are sv's or utf-x	376	// compare hash entries, used when some keys are sv's or utf-x
…		…
237	static void	383	static void
238	encode_hv (enc_t *enc, HV *hv)	384	encode_hv (enc_t *enc, HV *hv)
239	{	385	{
240	int count, i;	386	int count, i;
241		387
		388	if (enc->indent >= enc->maxdepth)
		389	croak ("data structure too deep (hit recursion limit)");
		390
242	encode_ch (enc, '{'); NL; ++enc->indent;	391	encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
243		392
244	if ((count = hv_iterinit (hv)))	393	if ((count = hv_iterinit (hv)))
245	{	394	{
246	// for canonical output we have to sort by keys first	395	// for canonical output we have to sort by keys first
247	// actually, this is mostly due to the stupid so-called	396	// actually, this is mostly due to the stupid so-called
248	// security workaround added somewhere in 5.8.x.	397	// security workaround added somewhere in 5.8.x.
249	// that randomises hash orderings	398	// that randomises hash orderings
250	if (enc->flags & F_CANONICAL)	399	if (enc->json.flags & F_CANONICAL)
251	{	400	{
252	HE *he, *hes [count];
253	int fast = 1;	401	int fast = 1;
		402	HE *he;
		403	#if defined(__BORLANDC__) || defined(_MSC_VER)
		404	HE **hes = _alloca (count * sizeof (HE));
		405	#else
		406	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
		407	#endif
254		408
255	i = 0;	409	i = 0;
256	while ((he = hv_iternext (hv)))	410	while ((he = hv_iternext (hv)))
257	{	411	{
258	hes [i++] = he;	412	hes [i++] = he;
…		…
264		418
265	if (fast)	419	if (fast)
266	qsort (hes, count, sizeof (HE *), he_cmp_fast);	420	qsort (hes, count, sizeof (HE *), he_cmp_fast);
267	else	421	else
268	{	422	{
269	// hack to disable "use bytes"	423	// hack to forcefully disable "use bytes"
270	COP *oldcop = PL_curcop, cop;	424	COP cop = *PL_curcop;
271	cop.op_private = 0;	425	cop.op_private = 0;
		426
		427	ENTER;
		428	SAVETMPS;
		429
		430	SAVEVPTR (PL_curcop);
272	PL_curcop = &cop;	431	PL_curcop = &cop;
273		432
274	SAVETMPS;
275	qsort (hes, count, sizeof (HE *), he_cmp_slow);	433	qsort (hes, count, sizeof (HE *), he_cmp_slow);
		434
276	FREETMPS;	435	FREETMPS;
277		436	LEAVE;
278	PL_curcop = oldcop;
279	}	437	}
280		438
281	for (i = 0; i < count; ++i)	439	for (i = 0; i < count; ++i)
282	{	440	{
283	INDENT;	441	encode_indent (enc);
284	encode_he (enc, hes [i]);	442	encode_he (enc, hes [i]);
285		443
286	if (i < count - 1)	444	if (i < count - 1)
287	COMMA;	445	encode_comma (enc);
288	}
289
290	NL;	446	}
		447
		448	encode_nl (enc);
291	}	449	}
292	else	450	else
293	{	451	{
294	SV *sv;
295	HE *he = hv_iternext (hv);	452	HE *he = hv_iternext (hv);
296		453
297	for (;;)	454	for (;;)
298	{	455	{
299	INDENT;	456	encode_indent (enc);
300	encode_he (enc, he);	457	encode_he (enc, he);
301		458
302	if (!(he = hv_iternext (hv)))	459	if (!(he = hv_iternext (hv)))
303	break;	460	break;
304		461
305	COMMA;	462	encode_comma (enc);
306	}
307
308	NL;	463	}
		464
		465	encode_nl (enc);
309	}	466	}
310	}	467	}
311		468
312	--enc->indent; INDENT; encode_ch (enc, '}');	469	--enc->indent; encode_indent (enc); encode_ch (enc, '}');
		470	}
		471
		472	// encode objects, arrays and special \0=false and \1=true values.
		473	static void
		474	encode_rv (enc_t *enc, SV *sv)
		475	{
		476	svtype svt;
		477
		478	SvGETMAGIC (sv);
		479	svt = SvTYPE (sv);
		480
		481	if (expect_false (SvOBJECT (sv)))
		482	{
		483	if (SvSTASH (sv) == json_boolean_stash)
		484	{
		485	if (SvIV (sv))
		486	encode_str (enc, "true", 4, 0);
		487	else
		488	encode_str (enc, "false", 5, 0);
		489	}
		490	else
		491	{
		492	#if 0
		493	if (0 && sv_derived_from (rv, "JSON::Literal"))
		494	{
		495	// not yet
		496	}
		497	#endif
		498	if (enc->json.flags & F_CONV_BLESSED)
		499	{
		500	// we re-bless the reference to get overload and other niceties right
		501	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
		502
		503	if (to_json)
		504	{
		505	int count;
		506	dSP;
		507
		508	ENTER; SAVETMPS; PUSHMARK (SP);
		509	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		510
		511	// calling with G_SCALAR ensures that we always get a 1 return value
		512	PUTBACK;
		513	call_sv ((SV *)GvCV (to_json), G_SCALAR);
		514	SPAGAIN;
		515
		516	// catch this surprisingly common error
		517	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		518	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		519
		520	sv = POPs;
		521	PUTBACK;
		522
		523	encode_sv (enc, sv);
		524
		525	FREETMPS; LEAVE;
		526	}
		527	else if (enc->json.flags & F_ALLOW_BLESSED)
		528	encode_str (enc, "null", 4, 0);
		529	else
		530	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		531	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		532	}
		533	else if (enc->json.flags & F_ALLOW_BLESSED)
		534	encode_str (enc, "null", 4, 0);
		535	else
		536	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		537	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		538	}
		539	}
		540	else if (svt == SVt_PVHV)
		541	encode_hv (enc, (HV *)sv);
		542	else if (svt == SVt_PVAV)
		543	encode_av (enc, (AV *)sv);
		544	else if (svt < SVt_PVAV)
		545	{
		546	STRLEN len = 0;
		547	char *pv = svt ? SvPV (sv, len) : 0;
		548
		549	if (len == 1 && *pv == '1')
		550	encode_str (enc, "true", 4, 0);
		551	else if (len == 1 && *pv == '0')
		552	encode_str (enc, "false", 5, 0);
		553	else
		554	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		555	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		556	}
		557	else
		558	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		559	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
313	}	560	}
314		561
315	static void	562	static void
316	encode_sv (enc_t *enc, SV *sv)	563	encode_sv (enc_t *enc, SV *sv)
317	{	564	{
		565	SvGETMAGIC (sv);
		566
318	if (SvPOKp (sv))	567	if (SvPOKp (sv))
319	{	568	{
320	STRLEN len;	569	STRLEN len;
321	char *str = SvPV (sv, len);	570	char *str = SvPV (sv, len);
322	encode_ch (enc, '"');	571	encode_ch (enc, '"');
323	encode_str (enc, str, len, SvUTF8 (sv));	572	encode_str (enc, str, len, SvUTF8 (sv));
324	encode_ch (enc, '"');	573	encode_ch (enc, '"');
325	}	574	}
326	else if (SvNOKp (sv))	575	else if (SvNOKp (sv))
327	{	576	{
		577	// trust that perl will do the right thing w.r.t. JSON syntax.
328	need (enc, NV_DIG + 32);	578	need (enc, NV_DIG + 32);
329	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	579	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
330	enc->cur += strlen (enc->cur);	580	enc->cur += strlen (enc->cur);
331	}	581	}
332	else if (SvIOKp (sv))	582	else if (SvIOKp (sv))
333	{	583	{
334	need (enc, 64);	584	// we assume we can always read an IV as a UV
		585	if (SvUV (sv) & ~(UV)0x7fff)
		586	{
		587	// large integer, use the (rather slow) snprintf way.
		588	need (enc, sizeof (UV) * 3);
335	enc->cur +=	589	enc->cur +=
336	SvIsUV(sv)	590	SvIsUV(sv)
337	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	591	? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
338	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	592	: snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
		593	}
		594	else
		595	{
		596	// optimise the "small number case"
		597	// code will likely be branchless and use only a single multiplication
		598	I32 i = SvIV (sv);
		599	U32 u;
		600	char digit, nz = 0;
		601
		602	need (enc, 6);
		603
		604	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		605	u = i < 0 ? -i : i;
		606
		607	// convert to 4.28 fixed-point representation
		608	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		609
		610	// now output digit by digit, each time masking out the integer part
		611	// and multiplying by 5 while moving the decimal point one to the right,
		612	// resulting in a net multiplication by 10.
		613	// we always write the digit to memory but conditionally increment
		614	// the pointer, to ease the usage of conditional move instructions.
		615	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
		616	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
		617	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
		618	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
		619	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		620	}
339	}	621	}
340	else if (SvROK (sv))	622	else if (SvROK (sv))
341	{	623	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))	624	else if (!SvOK (sv))
357	encode_str (enc, "null", 4, 0);	625	encode_str (enc, "null", 4, 0);
358	else	626	else
359	croak ("encountered perl type that JSON cannot handle");	627	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
		628	SvPV_nolen (sv), SvFLAGS (sv));
360	}	629	}
361		630
362	static SV *	631	static SV *
363	encode_json (SV *scalar, UV flags)	632	encode_json (SV *scalar, JSON *json)
364	{	633	{
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;	634	enc_t enc;
369	enc.flags = flags;	635
		636	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
		637	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
		638
		639	enc.json = *json;
370	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	640	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
371	enc.cur = SvPVX (enc.sv);	641	enc.cur = SvPVX (enc.sv);
372	enc.end = SvEND (enc.sv);	642	enc.end = SvEND (enc.sv);
373	enc.max_recurse = 0;
374	enc.indent = 0;	643	enc.indent = 0;
		644	enc.maxdepth = DEC_DEPTH (enc.json.flags);
375		645
376	SvPOK_only (enc.sv);	646	SvPOK_only (enc.sv);
377	encode_sv (&enc, scalar);	647	encode_sv (&enc, scalar);
378		648
		649	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		650	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		651
379	if (!(flags & (F_ASCII | F_UTF8)))	652	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
380	SvUTF8_on (enc.sv);	653	SvUTF8_on (enc.sv);
381		654
382	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));	655	if (enc.json.flags & F_SHRINK)
		656	shrink (enc.sv);
		657
383	return enc.sv;	658	return enc.sv;
384	}	659	}
385		660
386	/////////////////////////////////////////////////////////////////////////////	661	/////////////////////////////////////////////////////////////////////////////
		662	// decoder
387		663
388	#define WS \	664	// structure used for decoding JSON
		665	typedef struct
		666	{
		667	char *cur; // current parser pointer
		668	char *end; // end of input string
		669	const char *err; // parse error, if != 0
		670	JSON json;
		671	U32 depth; // recursion depth
		672	U32 maxdepth; // recursion depth limit
		673	} dec_t;
		674
		675	inline void
		676	decode_ws (dec_t *dec)
		677	{
389	for (;;) \	678	for (;;)
390	{ \	679	{
391	char ch = *dec->cur; \	680	char ch = *dec->cur;
		681
392	if (ch > 0x20 \	682	if (ch > 0x20
393	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	683	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
394	break; \	684	break;
		685
395	++dec->cur; \	686	++dec->cur;
396	}	687	}
		688	}
397		689
398	#define ERR(reason) SB dec->err = reason; goto fail; SE	690	#define ERR(reason) SB dec->err = reason; goto fail; SE
		691
399	#define EXPECT_CH(ch) SB \	692	#define EXPECT_CH(ch) SB \
400	if (*dec->cur != ch) \	693	if (*dec->cur != ch) \
401	ERR (# ch " expected"); \	694	ERR (# ch " expected"); \
402	++dec->cur; \	695	++dec->cur; \
403	SE	696	SE
404		697
		698	#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
		699	#define DEC_DEC_DEPTH --dec->depth
		700
405	static SV *decode_sv (dec_t *dec);	701	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		702
412	static signed char decode_hexdigit[256];	703	static signed char decode_hexdigit[256];
413		704
414	static UV	705	static UV
415	decode_4hex (dec_t *dec)	706	decode_4hex (dec_t *dec)
416	{	707	{
417	signed char d1, d2, d3, d4;	708	signed char d1, d2, d3, d4;
		709	unsigned char *cur = (unsigned char *)dec->cur;
418		710
419	d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]];	711	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");	712	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]];	713	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");	714	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		715
428	dec->cur += 4;	716	dec->cur += 4;
429		717
430	return ((UV)d1) << 12	718	return ((UV)d1) << 12
431	| ((UV)d2) << 8	719	| ((UV)d2) << 8
…		…
437	}	725	}
438		726
439	static SV *	727	static SV *
440	decode_str (dec_t *dec)	728	decode_str (dec_t *dec)
441	{	729	{
442	SV *sv = NEWSV (0,2);	730	SV *sv = 0;
443	STRLEN cur = 0;
444	int utf8 = 0;	731	int utf8 = 0;
		732	char *dec_cur = dec->cur;
445		733
446	for (;;)	734	do
447	{	735	{
448	unsigned char ch = *(unsigned char *)dec->cur;	736	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		737	char *cur = buf;
449		738
450	if (ch == '"')	739	do
451	break;
452	else if (ch == '\\')
453	{	740	{
454	switch (*++dec->cur)	741	unsigned char ch = *(unsigned char *)dec_cur++;
		742
		743	if (expect_false (ch == '"'))
		744	{
		745	--dec_cur;
		746	break;
455	{	747	}
456	case '\\':	748	else if (expect_false (ch == '\\'))
457	case '/':	749	{
458	case '"': APPEND_CH (*dec->cur++); break;	750	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	{	751	{
468	UV lo, hi;	752	case '\\':
469	++dec->cur;	753	case '/':
		754	case '"': *cur++ = *dec_cur++; break;
470		755
471	hi = decode_4hex (dec);	756	case 'b': ++dec_cur; *cur++ = '\010'; break;
472	if (hi == (UV)-1)	757	case 't': ++dec_cur; *cur++ = '\011'; break;
473	goto fail;	758	case 'n': ++dec_cur; *cur++ = '\012'; break;
		759	case 'f': ++dec_cur; *cur++ = '\014'; break;
		760	case 'r': ++dec_cur; *cur++ = '\015'; break;
474		761
475	// possibly a surrogate pair	762	case 'u':
476	if (hi >= 0xd800 && hi < 0xdc00)
477	{	763	{
478	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	764	UV lo, hi;
479	ERR ("illegal surrogate character");	765	++dec_cur;
480		766
481	dec->cur += 2;	767	dec->cur = dec_cur;
482
483	lo = decode_4hex (dec);	768	hi = decode_4hex (dec);
		769	dec_cur = dec->cur;
484	if (lo == (UV)-1)	770	if (hi == (UV)-1)
485	goto fail;	771	goto fail;
486		772
		773	// possibly a surrogate pair
		774	if (hi >= 0xd800)
		775	if (hi < 0xdc00)
		776	{
		777	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
		778	ERR ("missing low surrogate character in surrogate pair");
		779
		780	dec_cur += 2;
		781
		782	dec->cur = dec_cur;
		783	lo = decode_4hex (dec);
		784	dec_cur = dec->cur;
		785	if (lo == (UV)-1)
		786	goto fail;
		787
487	if (lo < 0xdc00 || lo >= 0xe000)	788	if (lo < 0xdc00 || lo >= 0xe000)
488	ERR ("surrogate pair expected");	789	ERR ("surrogate pair expected");
489		790
490	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;	791	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
		792	}
		793	else if (hi < 0xe000)
		794	ERR ("missing high surrogate character in surrogate pair");
		795
		796	if (hi >= 0x80)
		797	{
		798	utf8 = 1;
		799
		800	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
		801	}
		802	else
		803	*cur++ = hi;
491	}	804	}
492	else if (lo >= 0xdc00 && lo < 0xe000)
493	ERR ("illegal surrogate character");
494
495	if (hi >= 0x80)
496	{	805	break;
497	utf8 = 1;
498		806
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	807	default:
503	APPEND_CH (hi);	808	--dec_cur;
		809	ERR ("illegal backslash escape sequence in string");
504	}	810	}
		811	}
		812	else if (expect_true (ch >= 0x20 && ch <= 0x7f))
		813	*cur++ = ch;
		814	else if (ch >= 0x80)
		815	{
		816	STRLEN clen;
		817	UV uch;
		818
		819	--dec_cur;
		820
		821	uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		822	if (clen == (STRLEN)-1)
		823	ERR ("malformed UTF-8 character in JSON string");
		824
		825	do
		826	*cur++ = *dec_cur++;
		827	while (--clen);
		828
		829	utf8 = 1;
		830	}
		831	else
		832	{
		833	--dec_cur;
		834
		835	if (!ch)
		836	ERR ("unexpected end of string while parsing JSON string");
505	break;	837	else
		838	ERR ("invalid character encountered while parsing JSON string");
506	}	839	}
507	}	840	}
508	else if (ch >= 0x20 && ch <= 0x7f)	841	while (cur < buf + SHORT_STRING_LEN);
509	APPEND_CH (*dec->cur++);	842
510	else if (ch >= 0x80)	843	{
		844	STRLEN len = cur - buf;
		845
		846	if (sv)
511	{	847	{
512	STRLEN clen;	848	SvGROW (sv, SvCUR (sv) + len + 1);
513	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);	849	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
514	if (clen < 0)	850	SvCUR_set (sv, SvCUR (sv) + len);
515	ERR ("malformed UTF-8 character in string, cannot convert to JSON");
516
517	SvGROW (sv, cur + clen + 1); // at most 4 bytes for 21 bits
518	memcpy (SvPVX (sv) + cur, dec->cur, clen);
519	dec->cur += clen;
520	}	851	}
521	else	852	else
522	ERR ("invalid character encountered");	853	sv = newSVpvn (buf, len);
523	}	854	}
		855	}
		856	while (*dec_cur != '"');
524		857
525	++dec->cur;	858	++dec_cur;
526		859
		860	if (sv)
		861	{
527	SvPOK_only (sv);	862	SvPOK_only (sv);
528
529	SvCUR_set (sv, cur);
530	*SvEND (sv) = 0;	863	*SvEND (sv) = 0;
531		864
532	if (utf8)	865	if (utf8)
533	SvUTF8_on (sv);	866	SvUTF8_on (sv);
		867	}
		868	else
		869	sv = newSVpvn ("", 0);
534		870
		871	dec->cur = dec_cur;
535	return sv;	872	return sv;
536		873
537	fail:	874	fail:
538	SvREFCNT_dec (sv);	875	dec->cur = dec_cur;
539	return 0;	876	return 0;
540	}	877	}
541		878
542	static SV *	879	static SV *
543	decode_num (dec_t *dec)	880	decode_num (dec_t *dec)
…		…
553	{	890	{
554	++dec->cur;	891	++dec->cur;
555	if (*dec->cur >= '0' && *dec->cur <= '9')	892	if (*dec->cur >= '0' && *dec->cur <= '9')
556	ERR ("malformed number (leading zero must not be followed by another digit)");	893	ERR ("malformed number (leading zero must not be followed by another digit)");
557	}	894	}
558		895	else if (*dec->cur < '0' || *dec->cur > '9')
559	// int	896	ERR ("malformed number (no digits after initial minus)");
		897	else
		898	do
		899	{
		900	++dec->cur;
		901	}
560	while (*dec->cur >= '0' && *dec->cur <= '9')	902	while (*dec->cur >= '0' && *dec->cur <= '9');
561	++dec->cur;
562		903
563	// [frac]	904	// [frac]
564	if (*dec->cur == '.')	905	if (*dec->cur == '.')
565	{	906	{
566	is_nv = 1;	907	++dec->cur;
		908
		909	if (*dec->cur < '0' || *dec->cur > '9')
		910	ERR ("malformed number (no digits after decimal point)");
567		911
568	do	912	do
569	{	913	{
570	++dec->cur;	914	++dec->cur;
571	}	915	}
572	while (*dec->cur >= '0' && *dec->cur <= '9');	916	while (*dec->cur >= '0' && *dec->cur <= '9');
		917
		918	is_nv = 1;
573	}	919	}
574		920
575	// [exp]	921	// [exp]
576	if (*dec->cur == 'e' || *dec->cur == 'E')	922	if (*dec->cur == 'e' || *dec->cur == 'E')
577	{	923	{
578	is_nv = 1;
579
580	++dec->cur;	924	++dec->cur;
		925
581	if (*dec->cur == '-' || *dec->cur == '+')	926	if (*dec->cur == '-' || *dec->cur == '+')
582	++dec->cur;	927	++dec->cur;
583		928
		929	if (*dec->cur < '0' || *dec->cur > '9')
		930	ERR ("malformed number (no digits after exp sign)");
		931
		932	do
		933	{
		934	++dec->cur;
		935	}
584	while (*dec->cur >= '0' && *dec->cur <= '9')	936	while (*dec->cur >= '0' && *dec->cur <= '9');
585	++dec->cur;	937
		938	is_nv = 1;
586	}	939	}
587		940
588	if (!is_nv)	941	if (!is_nv)
589	{	942	{
590	UV uv;	943	int len = dec->cur - start;
591	int numtype = grok_number (start, dec->cur - start, &uv);	944
592	if (numtype & IS_NUMBER_IN_UV)	945	// special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
593	if (numtype & IS_NUMBER_NEG)	946	if (*start == '-')
		947	switch (len)
594	{	948	{
595	if (uv < (UV)IV_MIN)	949	case 2: return newSViv (-( start [1] - '0' * 1));
596	return newSViv (-(IV)uv);	950	case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
		951	case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		952	case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
597	}	953	}
		954	else
		955	switch (len)
		956	{
		957	case 1: return newSViv ( start [0] - '0' * 1);
		958	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		959	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		960	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		961	}
		962
		963	{
		964	UV uv;
		965	int numtype = grok_number (start, len, &uv);
		966	if (numtype & IS_NUMBER_IN_UV)
		967	if (numtype & IS_NUMBER_NEG)
		968	{
		969	if (uv < (UV)IV_MIN)
		970	return newSViv (-(IV)uv);
		971	}
598	else	972	else
599	return newSVuv (uv);	973	return newSVuv (uv);
600	}	974	}
601		975
		976	len -= *start == '-' ? 1 : 0;
		977
		978	// does not fit into IV or UV, try NV
		979	if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len)
		980	#if defined (LDBL_DIG)
		981	|| (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len)
		982	#endif
		983	)
		984	// fits into NV without loss of precision
		985	return newSVnv (Atof (start));
		986
		987	// everything else fails, convert it to a string
		988	return newSVpvn (start, dec->cur - start);
		989	}
		990
		991	// loss of precision here
602	return newSVnv (Atof (start));	992	return newSVnv (Atof (start));
603		993
604	fail:	994	fail:
605	return 0;	995	return 0;
606	}	996	}
…		…
608	static SV *	998	static SV *
609	decode_av (dec_t *dec)	999	decode_av (dec_t *dec)
610	{	1000	{
611	AV *av = newAV ();	1001	AV *av = newAV ();
612		1002
		1003	DEC_INC_DEPTH;
		1004	decode_ws (dec);
		1005
		1006	if (*dec->cur == ']')
		1007	++dec->cur;
		1008	else
613	for (;;)	1009	for (;;)
614	{	1010	{
615	SV *value;	1011	SV *value;
616		1012
617	value = decode_sv (dec);	1013	value = decode_sv (dec);
618	if (!value)	1014	if (!value)
619	goto fail;	1015	goto fail;
620		1016
621	av_push (av, value);	1017	av_push (av, value);
622		1018
623	WS;	1019	decode_ws (dec);
624		1020
625	if (*dec->cur == ']')	1021	if (*dec->cur == ']')
626	{	1022	{
627	++dec->cur;	1023	++dec->cur;
628	break;	1024	break;
		1025	}
629	}	1026
630
631	if (*dec->cur != ',')	1027	if (*dec->cur != ',')
632	ERR (", or ] expected while parsing array");	1028	ERR (", or ] expected while parsing array");
633		1029
634	++dec->cur;	1030	++dec->cur;
635	}	1031	}
636		1032
		1033	DEC_DEC_DEPTH;
637	return newRV_noinc ((SV *)av);	1034	return newRV_noinc ((SV *)av);
638		1035
639	fail:	1036	fail:
640	SvREFCNT_dec (av);	1037	SvREFCNT_dec (av);
		1038	DEC_DEC_DEPTH;
641	return 0;	1039	return 0;
642	}	1040	}
643		1041
644	static SV *	1042	static SV *
645	decode_hv (dec_t *dec)	1043	decode_hv (dec_t *dec)
646	{	1044	{
		1045	SV *sv;
647	HV *hv = newHV ();	1046	HV *hv = newHV ();
648		1047
		1048	DEC_INC_DEPTH;
		1049	decode_ws (dec);
		1050
		1051	if (*dec->cur == '}')
		1052	++dec->cur;
		1053	else
649	for (;;)	1054	for (;;)
650	{	1055	{
651	SV *key, *value;	1056	decode_ws (dec); EXPECT_CH ('"');
652		1057
653	WS; EXPECT_CH ('"');	1058	// heuristic: assume that
654		1059	// a) decode_str + hv_store_ent are abysmally slow.
655	key = decode_str (dec);	1060	// b) most hash keys are short, simple ascii text.
656	if (!key)	1061	// => try to "fast-match" such strings to avoid
657	goto fail;	1062	// the overhead of decode_str + hv_store_ent.
658
659	WS; EXPECT_CH (':');
660
661	value = decode_sv (dec);
662	if (!value)
663	{	1063	{
		1064	SV *value;
		1065	char *p = dec->cur;
		1066	char *e = p + 24; // only try up to 24 bytes
		1067
		1068	for (;;)
		1069	{
		1070	// the >= 0x80 is true on most architectures
		1071	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1072	{
		1073	// slow path, back up and use decode_str
		1074	SV *key = decode_str (dec);
		1075	if (!key)
		1076	goto fail;
		1077
		1078	decode_ws (dec); EXPECT_CH (':');
		1079
		1080	value = decode_sv (dec);
		1081	if (!value)
		1082	{
		1083	SvREFCNT_dec (key);
		1084	goto fail;
		1085	}
		1086
		1087	hv_store_ent (hv, key, value, 0);
664	SvREFCNT_dec (key);	1088	SvREFCNT_dec (key);
		1089
		1090	break;
		1091	}
		1092	else if (*p == '"')
		1093	{
		1094	// fast path, got a simple key
		1095	char *key = dec->cur;
		1096	int len = p - key;
		1097	dec->cur = p + 1;
		1098
		1099	decode_ws (dec); EXPECT_CH (':');
		1100
		1101	value = decode_sv (dec);
		1102	if (!value)
665	goto fail;	1103	goto fail;
		1104
		1105	hv_store (hv, key, len, value, 0);
		1106
		1107	break;
		1108	}
		1109
		1110	++p;
		1111	}
666	}	1112	}
667		1113
668	//TODO: optimise	1114	decode_ws (dec);
669	hv_store_ent (hv, key, value, 0);
670		1115
671	WS;
672
673	if (*dec->cur == '}')	1116	if (*dec->cur == '}')
		1117	{
		1118	++dec->cur;
		1119	break;
		1120	}
		1121
		1122	if (*dec->cur != ',')
		1123	ERR (", or } expected while parsing object/hash");
		1124
		1125	++dec->cur;
		1126	}
		1127
		1128	DEC_DEC_DEPTH;
		1129	sv = newRV_noinc ((SV *)hv);
		1130
		1131	// check filter callbacks
		1132	if (dec->json.flags & F_HOOK)
		1133	{
		1134	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
674	{	1135	{
675	++dec->cur;	1136	HE *cb, *he;
676	break;	1137
		1138	hv_iterinit (hv);
		1139	he = hv_iternext (hv);
		1140	hv_iterinit (hv);
		1141
		1142	// the next line creates a mortal sv each time its called.
		1143	// might want to optimise this for common cases.
		1144	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1145
		1146	if (cb)
		1147	{
		1148	dSP;
		1149	int count;
		1150
		1151	ENTER; SAVETMPS; PUSHMARK (SP);
		1152	XPUSHs (HeVAL (he));
		1153
		1154	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1155
		1156	if (count == 1)
		1157	{
		1158	sv = newSVsv (POPs);
		1159	FREETMPS; LEAVE;
		1160	return sv;
		1161	}
		1162
		1163	FREETMPS; LEAVE;
		1164	}
677	}	1165	}
678		1166
679	if (*dec->cur != ',')	1167	if (dec->json.cb_object)
680	ERR (", or } expected while parsing object/hash");	1168	{
		1169	dSP;
		1170	int count;
681		1171
682	++dec->cur;	1172	ENTER; SAVETMPS; PUSHMARK (SP);
683	}	1173	XPUSHs (sv_2mortal (sv));
684		1174
685	return newRV_noinc ((SV *)hv);	1175	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1176
		1177	if (count == 1)
		1178	{
		1179	sv = newSVsv (POPs);
		1180	FREETMPS; LEAVE;
		1181	return sv;
		1182	}
		1183
		1184	SvREFCNT_inc (sv);
		1185	FREETMPS; LEAVE;
		1186	}
		1187	}
		1188
		1189	return sv;
686		1190
687	fail:	1191	fail:
688	SvREFCNT_dec (hv);	1192	SvREFCNT_dec (hv);
		1193	DEC_DEC_DEPTH;
689	return 0;	1194	return 0;
690	}	1195	}
691		1196
692	static SV *	1197	static SV *
693	decode_sv (dec_t *dec)	1198	decode_sv (dec_t *dec)
694	{	1199	{
695	WS;	1200	decode_ws (dec);
		1201
		1202	// the beauty of JSON: you need exactly one character lookahead
		1203	// to parse anything.
696	switch (*dec->cur)	1204	switch (*dec->cur)
697	{	1205	{
698	case '"': ++dec->cur; return decode_str (dec);	1206	case '"': ++dec->cur; return decode_str (dec);
699	case '[': ++dec->cur; return decode_av (dec);	1207	case '[': ++dec->cur; return decode_av (dec);
700	case '{': ++dec->cur; return decode_hv (dec);	1208	case '{': ++dec->cur; return decode_hv (dec);
…		…
706		1214
707	case 't':	1215	case 't':
708	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1216	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
709	{	1217	{
710	dec->cur += 4;	1218	dec->cur += 4;
711	return newSViv (1);	1219	return SvREFCNT_inc (json_true);
712	}	1220	}
713	else	1221	else
714	ERR ("'true' expected");	1222	ERR ("'true' expected");
715		1223
716	break;	1224	break;
717		1225
718	case 'f':	1226	case 'f':
719	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1227	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
720	{	1228	{
721	dec->cur += 5;	1229	dec->cur += 5;
722	return newSViv (0);	1230	return SvREFCNT_inc (json_false);
723	}	1231	}
724	else	1232	else
725	ERR ("'false' expected");	1233	ERR ("'false' expected");
726		1234
727	break;	1235	break;
728		1236
729	case 'n':	1237	case 'n':
730	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))	1238	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))
731	{	1239	{
732	dec->cur += 4;	1240	dec->cur += 4;
733	return newSViv (1);	1241	return newSVsv (&PL_sv_undef);
734	}	1242	}
735	else	1243	else
736	ERR ("'null' expected");	1244	ERR ("'null' expected");
737		1245
738	break;	1246	break;
739		1247
740	default:	1248	default:
741	ERR ("malformed json string");	1249	ERR ("malformed JSON string, neither array, object, number, string or atom");
742	break;	1250	break;
743	}	1251	}
744		1252
745	fail:	1253	fail:
746	return 0;	1254	return 0;
747	}	1255	}
748		1256
749	static SV *	1257	static SV *
750	decode_json (SV *string, UV flags)	1258	decode_json (SV *string, JSON *json, UV *offset_return)
751	{	1259	{
		1260	dec_t dec;
		1261	UV offset;
752	SV *sv;	1262	SV *sv;
753		1263
		1264	SvGETMAGIC (string);
		1265	SvUPGRADE (string, SVt_PV);
		1266
		1267	if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
		1268	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1269	(unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
		1270
754	if (!(flags & F_UTF8))	1271	if (json->flags & F_UTF8)
		1272	sv_utf8_downgrade (string, 0);
		1273	else
755	sv_utf8_upgrade (string);	1274	sv_utf8_upgrade (string);
756		1275
757	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1276	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
758		1277
759	dec_t dec;	1278	dec.json = *json;
760	dec.flags = flags;
761	dec.cur = SvPVX (string);	1279	dec.cur = SvPVX (string);
762	dec.end = SvEND (string);	1280	dec.end = SvEND (string);
763	dec.err = 0;	1281	dec.err = 0;
		1282	dec.depth = 0;
		1283	dec.maxdepth = DEC_DEPTH (dec.json.flags);
764		1284
765	*dec.end = 1; // invalid anywhere	1285	if (dec.json.cb_object || dec.json.cb_sk_object)
		1286	dec.json.flags |= F_HOOK;
		1287
		1288	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
766	sv = decode_sv (&dec);	1289	sv = decode_sv (&dec);
767	*dec.end = 0;	1290
		1291	if (!(offset_return || !sv))
		1292	{
		1293	// check for trailing garbage
		1294	decode_ws (&dec);
		1295
		1296	if (*dec.cur)
		1297	{
		1298	dec.err = "garbage after JSON object";
		1299	SvREFCNT_dec (sv);
		1300	sv = 0;
		1301	}
		1302	}
		1303
		1304	if (offset_return || !sv)
		1305	{
		1306	offset = dec.json.flags & F_UTF8
		1307	? dec.cur - SvPVX (string)
		1308	: utf8_distance (dec.cur, SvPVX (string));
		1309
		1310	if (offset_return)
		1311	*offset_return = offset;
		1312	}
768		1313
769	if (!sv)	1314	if (!sv)
770	{	1315	{
771	IV offset = utf8_distance (dec.cur, SvPVX (string));
772	SV *uni = sv_newmortal ();	1316	SV *uni = sv_newmortal ();
773		1317
		1318	// horrible hack to silence warning inside pv_uni_display
		1319	COP cop = *PL_curcop;
		1320	cop.cop_warnings = pWARN_NONE;
		1321	ENTER;
		1322	SAVEVPTR (PL_curcop);
		1323	PL_curcop = &cop;
774	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1324	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
		1325	LEAVE;
		1326
775	croak ("%s, at character %d (%s)",	1327	croak ("%s, at character offset %d [\"%s\"]",
776	dec.err,	1328	dec.err,
777	(int)offset,	1329	(int)offset,
778	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1330	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
779	}	1331	}
780		1332
781	sv = sv_2mortal (sv);	1333	sv = sv_2mortal (sv);
782		1334
783	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1335	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)");	1336	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
785		1337
786	return sv;	1338	return sv;
787	}	1339	}
788		1340
		1341	/////////////////////////////////////////////////////////////////////////////
		1342	// XS interface functions
		1343
789	MODULE = JSON::XS PACKAGE = JSON::XS	1344	MODULE = JSON::XS PACKAGE = JSON::XS
790		1345
791	BOOT:	1346	BOOT:
792	{	1347	{
793	int i;	1348	int i;
794		1349
795	memset (decode_hexdigit, 0xff, 256);
796	for (i = 10; i--; )	1350	for (i = 0; i < 256; ++i)
797	decode_hexdigit ['0' + i] = i;	1351	decode_hexdigit [i] =
		1352	i >= '0' && i <= '9' ? i - '0'
		1353	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1354	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1355	: -1;
798		1356
799	for (i = 6; --i; )	1357	json_stash = gv_stashpv ("JSON::XS" , 1);
		1358	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1359
		1360	json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
		1361	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1362	}
		1363
		1364	PROTOTYPES: DISABLE
		1365
		1366	void new (char *klass)
		1367	PPCODE:
		1368	{
		1369	SV *pv = NEWSV (0, sizeof (JSON));
		1370	SvPOK_only (pv);
		1371	Zero (SvPVX (pv), 1, JSON);
		1372	((JSON *)SvPVX (pv))->flags = F_DEFAULT;
		1373	XPUSHs (sv_2mortal (sv_bless (newRV_noinc (pv), json_stash)));
		1374	}
		1375
		1376	void ascii (JSON *self, int enable = 1)
		1377	ALIAS:
		1378	ascii = F_ASCII
		1379	latin1 = F_LATIN1
		1380	utf8 = F_UTF8
		1381	indent = F_INDENT
		1382	canonical = F_CANONICAL
		1383	space_before = F_SPACE_BEFORE
		1384	space_after = F_SPACE_AFTER
		1385	pretty = F_PRETTY
		1386	allow_nonref = F_ALLOW_NONREF
		1387	shrink = F_SHRINK
		1388	allow_blessed = F_ALLOW_BLESSED
		1389	convert_blessed = F_CONV_BLESSED
		1390	PPCODE:
		1391	{
		1392	if (enable)
		1393	self->flags |= ix;
		1394	else
		1395	self->flags &= ~ix;
		1396
		1397	XPUSHs (ST (0));
		1398	}
		1399
		1400	void max_depth (JSON *self, UV max_depth = 0x80000000UL)
		1401	PPCODE:
		1402	{
		1403	UV log2 = 0;
		1404
		1405	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
		1406
		1407	while ((1UL << log2) < max_depth)
		1408	++log2;
		1409
		1410	self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
		1411
		1412	XPUSHs (ST (0));
		1413	}
		1414
		1415	void max_size (JSON *self, UV max_size = 0)
		1416	PPCODE:
		1417	{
		1418	UV log2 = 0;
		1419
		1420	if (max_size > 0x80000000UL) max_size = 0x80000000UL;
		1421	if (max_size == 1) max_size = 2;
		1422
		1423	while ((1UL << log2) < max_size)
		1424	++log2;
		1425
		1426	self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
		1427
		1428	XPUSHs (ST (0));
		1429	}
		1430
		1431	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
		1432	PPCODE:
		1433	{
		1434	SvREFCNT_dec (self->cb_object);
		1435	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
		1436
		1437	XPUSHs (ST (0));
		1438	}
		1439
		1440	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
		1441	PPCODE:
		1442	{
		1443	if (!self->cb_sk_object)
		1444	self->cb_sk_object = newHV ();
		1445
		1446	if (SvOK (cb))
		1447	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1448	else
800	{	1449	{
801	decode_hexdigit ['a' + i] = 10 + i;	1450	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
802	decode_hexdigit ['A' + i] = 10 + i;	1451
		1452	if (!HvKEYS (self->cb_sk_object))
		1453	{
		1454	SvREFCNT_dec (self->cb_sk_object);
		1455	self->cb_sk_object = 0;
		1456	}
803	}	1457	}
804		1458
805	json_stash = gv_stashpv ("JSON::XS", 1);	1459	XPUSHs (ST (0));
806	}	1460	}
807		1461
808	SV *new (char *dummy)	1462	void encode (JSON *self, SV *scalar)
		1463	PPCODE:
		1464	XPUSHs (encode_json (scalar, self));
		1465
		1466	void decode (JSON *self, SV *jsonstr)
		1467	PPCODE:
		1468	XPUSHs (decode_json (jsonstr, self, 0));
		1469
		1470	void decode_prefix (JSON *self, SV *jsonstr)
		1471	PPCODE:
		1472	{
		1473	UV offset;
		1474	EXTEND (SP, 2);
		1475	PUSHs (decode_json (jsonstr, self, &offset));
		1476	PUSHs (sv_2mortal (newSVuv (offset)));
		1477	}
		1478
		1479	void DESTROY (JSON *self)
809	CODE:	1480	CODE:
810	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1481	SvREFCNT_dec (self->cb_sk_object);
811	OUTPUT:	1482	SvREFCNT_dec (self->cb_object);
812	RETVAL
813		1483
814	SV *ascii (SV *self, int enable)	1484	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		1485
846	void to_json (SV *scalar)	1486	void to_json (SV *scalar)
847	PPCODE:	1487	PPCODE:
		1488	{
		1489	JSON json = { F_DEFAULT | F_UTF8 };
848	XPUSHs (encode_json (scalar, F_UTF8));	1490	XPUSHs (encode_json (scalar, &json));
		1491	}
849		1492
850	void from_json (SV *jsonstr)	1493	void from_json (SV *jsonstr)
851	PPCODE:	1494	PPCODE:
		1495	{
		1496	JSON json = { F_DEFAULT | F_UTF8 };
852	XPUSHs (decode_json (jsonstr, F_UTF8));	1497	XPUSHs (decode_json (jsonstr, &json, 0));
		1498	}
853		1499

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