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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 1.59 by root, Mon Aug 13 16:14:20 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	#ifdef USE_ITHREADS
		64	# define JSON_SLOW 1
		65	# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
		66	#else
		67	# define JSON_SLOW 0
		68	# define JSON_STASH json_stash
		69	#endif
		70
		71	static HV *json_stash, *json_boolean_stash; // JSON::XS::
		72	static SV *json_true, *json_false;
		73
		74	typedef struct {
		75	U32 flags;
		76	SV *cb_object;
		77	HV *cb_sk_object;
		78	} JSON;
		79
		80	/////////////////////////////////////////////////////////////////////////////
		81	// utility functions
		82
		83	inline void
		84	shrink (SV *sv)
		85	{
		86	sv_utf8_downgrade (sv, 1);
		87	if (SvLEN (sv) > SvCUR (sv) + 1)
		88	{
		89	#ifdef SvPV_shrink_to_cur
		90	SvPV_shrink_to_cur (sv);
		91	#elif defined (SvPV_renew)
		92	SvPV_renew (sv, SvCUR (sv) + 1);
		93	#endif
		94	}
		95	}
		96
		97	// decode an utf-8 character and return it, or (UV)-1 in
		98	// case of an error.
		99	// we special-case "safe" characters from U+80 .. U+7FF,
		100	// but use the very good perl function to parse anything else.
		101	// note that we never call this function for a ascii codepoints
		102	inline UV
		103	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
		104	{
		105	if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
		106	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		107	else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
		108	{
		109	*clen = 2;
		110	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
		111	}
		112	else
		113	{
		114	*clen = (STRLEN)-1;
		115	return (UV)-1;
		116	}
		117	}
		118
		119	/////////////////////////////////////////////////////////////////////////////
		120	// encoder
27		121
28	// structure used for encoding JSON	122	// structure used for encoding JSON
29	typedef struct	123	typedef struct
30	{	124	{
31	char *cur;	125	char *cur; // SvPVX (sv) + current output position
32	STRLEN len; // SvLEN (sv)
33	char *end; // SvEND (sv)	126	char *end; // SvEND (sv)
34	SV *sv;	127	SV *sv; // result scalar
35	UV flags;	128	JSON json;
36	int max_recurse;	129	U32 indent; // indentation level
37	int indent;	130	U32 maxdepth; // max. indentation/recursion level
38	} enc_t;	131	} enc_t;
39		132
40	// structure used for decoding JSON	133	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)	134	need (enc_t *enc, STRLEN len)
62	{	135	{
63	if (enc->cur + len >= enc->end)	136	if (expect_false (enc->cur + len >= enc->end))
64	{	137	{
65	STRLEN cur = enc->cur - SvPVX (enc->sv);	138	STRLEN cur = enc->cur - SvPVX (enc->sv);
66	SvGROW (enc->sv, cur + len + 1);	139	SvGROW (enc->sv, cur + len + 1);
67	enc->cur = SvPVX (enc->sv) + cur;	140	enc->cur = SvPVX (enc->sv) + cur;
68	enc->end = SvEND (enc->sv);	141	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
69	}	142	}
70	}	143	}
71		144
72	static void	145	inline void
73	encode_ch (enc_t *enc, char ch)	146	encode_ch (enc_t *enc, char ch)
74	{	147	{
75	need (enc, 1);	148	need (enc, 1);
76	*enc->cur++ = ch;	149	*enc->cur++ = ch;
77	}	150	}
…		…
79	static void	152	static void
80	encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8)	153	encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8)
81	{	154	{
82	char *end = str + len;	155	char *end = str + len;
83		156
		157	need (enc, len);
		158
84	while (str < end)	159	while (str < end)
85	{	160	{
86	unsigned char ch = *(unsigned char *)str;	161	unsigned char ch = *(unsigned char *)str;
		162
87	if (ch >= 0x20 && ch < 0x80) // most common case	163	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
88	{	164	{
		165	if (expect_false (ch == '"')) // but with slow exceptions
		166	{
		167	need (enc, len += 1);
		168	*enc->cur++ = '\\';
		169	*enc->cur++ = '"';
		170	}
		171	else if (expect_false (ch == '\\'))
		172	{
		173	need (enc, len += 1);
		174	*enc->cur++ = '\\';
		175	*enc->cur++ = '\\';
		176	}
		177	else
89	*enc->cur++ = ch;	178	*enc->cur++ = ch;
		179
90	str++;	180	++str;
91	}	181	}
92	else	182	else
93	{	183	{
94	STRLEN clen;	184	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	}	185	{
103	else	186	case '\010': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
104	{	187	case '\011': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
105	uch = ch;	188	case '\012': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
106	clen = 1;	189	case '\014': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
107	}	190	case '\015': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
108		191
109	need (enc, len += 6);	192	default:
110
111	if (uch < 0xa0 || enc->flags & F_ASCII)
112	{
113	if (uch > 0xFFFFUL)
114	{	193	{
		194	STRLEN clen;
		195	UV uch;
		196
		197	if (is_utf8)
		198	{
		199	uch = decode_utf8 (str, end - str, &clen);
		200	if (clen == (STRLEN)-1)
		201	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
		202	}
		203	else
		204	{
		205	uch = ch;
115	len += 6;	206	clen = 1;
		207	}
		208
		209	if (uch > 0x10FFFFUL)
		210	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		211
		212	if (uch < 0x80 || enc->json.flags & F_ASCII || (enc->json.flags & F_LATIN1 && uch > 0xFF))
		213	{
		214	if (uch > 0xFFFFUL)
		215	{
116	need (enc, len += 6);	216	need (enc, len += 11);
117	sprintf (enc->cur, "\\u%04x\\u%04x",	217	sprintf (enc->cur, "\\u%04x\\u%04x",
118	(uch - 0x10000) / 0x400 + 0xD800,	218	(int)((uch - 0x10000) / 0x400 + 0xD800),
119	(uch - 0x10000) % 0x400 + 0xDC00);	219	(int)((uch - 0x10000) % 0x400 + 0xDC00));
120	enc->cur += 12;	220	enc->cur += 12;
		221	}
		222	else
		223	{
		224	static char hexdigit [16] = "0123456789abcdef";
		225	need (enc, len += 5);
		226	*enc->cur++ = '\\';
		227	*enc->cur++ = 'u';
		228	*enc->cur++ = hexdigit [ uch >> 12 ];
		229	*enc->cur++ = hexdigit [(uch >> 8) & 15];
		230	*enc->cur++ = hexdigit [(uch >> 4) & 15];
		231	*enc->cur++ = hexdigit [(uch >> 0) & 15];
		232	}
		233
		234	str += clen;
		235	}
		236	else if (enc->json.flags & F_LATIN1)
		237	{
		238	*enc->cur++ = uch;
		239	str += clen;
		240	}
		241	else if (is_utf8)
		242	{
		243	need (enc, len += clen);
		244	do
		245	{
		246	*enc->cur++ = *str++;
		247	}
		248	while (--clen);
		249	}
		250	else
		251	{
		252	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
		253	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
		254	++str;
		255	}
121	}	256	}
122	else
123	{
124	sprintf (enc->cur, "\\u%04x", uch);
125	enc->cur += 6;
126	}
127	}
128	else if (is_utf8)
129	{	257	}
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	}	258	}
138		259
139	--len;	260	--len;
140	}	261	}
141	}	262	}
142		263
143	#define INDENT SB \	264	inline void
		265	encode_indent (enc_t *enc)
		266	{
144	if (enc->flags & F_INDENT) \	267	if (enc->json.flags & F_INDENT)
145	{ \	268	{
146	int i_; \	269	int spaces = enc->indent * INDENT_STEP;
147	need (enc, enc->indent); \	270
148	for (i_ = enc->indent * 3; i_--; )\	271	need (enc, spaces);
		272	memset (enc->cur, ' ', spaces);
		273	enc->cur += spaces;
		274	}
		275	}
		276
		277	inline void
		278	encode_space (enc_t *enc)
		279	{
		280	need (enc, 1);
		281	encode_ch (enc, ' ');
		282	}
		283
		284	inline void
		285	encode_nl (enc_t *enc)
		286	{
		287	if (enc->json.flags & F_INDENT)
		288	{
		289	need (enc, 1);
149	encode_ch (enc, ' '); \	290	encode_ch (enc, '\n');
150	} \	291	}
151	SE	292	}
152		293
153	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	294	inline void
154	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	295	encode_comma (enc_t *enc)
155	#define COMMA SB \	296	{
156	encode_ch (enc, ','); \	297	encode_ch (enc, ',');
		298
157	if (enc->flags & F_INDENT) \	299	if (enc->json.flags & F_INDENT)
158	NL; \	300	encode_nl (enc);
159	else if (enc->flags & F_SPACE_AFTER) \	301	else if (enc->json.flags & F_SPACE_AFTER)
160	SPACE; \	302	encode_space (enc);
161	SE	303	}
162		304
163	static void encode_sv (enc_t *enc, SV *sv);	305	static void encode_sv (enc_t *enc, SV *sv);
164		306
165	static void	307	static void
166	encode_av (enc_t *enc, AV *av)	308	encode_av (enc_t *enc, AV *av)
167	{	309	{
168	int i, len = av_len (av);	310	int i, len = av_len (av);
169		311
170	encode_ch (enc, '['); NL;	312	if (enc->indent >= enc->maxdepth)
		313	croak ("data structure too deep (hit recursion limit)");
		314
		315	encode_ch (enc, '['); encode_nl (enc);
171	++enc->indent;	316	++enc->indent;
172		317
173	for (i = 0; i <= len; ++i)	318	for (i = 0; i <= len; ++i)
174	{	319	{
175	INDENT;	320	SV **svp = av_fetch (av, i, 0);
176	encode_sv (enc, *av_fetch (av, i, 0));	321
		322	encode_indent (enc);
		323
		324	if (svp)
		325	encode_sv (enc, *svp);
		326	else
		327	encode_str (enc, "null", 4, 0);
177		328
178	if (i < len)	329	if (i < len)
179	COMMA;	330	encode_comma (enc);
180	}	331	}
181		332
182	NL;	333	encode_nl (enc);
183		334
184	--enc->indent;	335	--enc->indent;
185	INDENT; encode_ch (enc, ']');	336	encode_indent (enc); encode_ch (enc, ']');
186	}	337	}
187		338
188	static void	339	static void
189	encode_he (enc_t *enc, HE *he)	340	encode_he (enc_t *enc, HE *he)
190	{	341	{
…		…
192		343
193	if (HeKLEN (he) == HEf_SVKEY)	344	if (HeKLEN (he) == HEf_SVKEY)
194	{	345	{
195	SV *sv = HeSVKEY (he);	346	SV *sv = HeSVKEY (he);
196	STRLEN len;	347	STRLEN len;
		348	char *str;
		349
		350	SvGETMAGIC (sv);
197	char *str = SvPV (sv, len);	351	str = SvPV (sv, len);
198		352
199	encode_str (enc, str, len, SvUTF8 (sv));	353	encode_str (enc, str, len, SvUTF8 (sv));
200	}	354	}
201	else	355	else
202	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	356	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
203		357
204	encode_ch (enc, '"');	358	encode_ch (enc, '"');
205		359
206	if (enc->flags & F_SPACE_BEFORE) SPACE;	360	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
207	encode_ch (enc, ':');	361	encode_ch (enc, ':');
208	if (enc->flags & F_SPACE_AFTER ) SPACE;	362	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
209	encode_sv (enc, HeVAL (he));	363	encode_sv (enc, HeVAL (he));
210	}	364	}
211		365
212	// compare hash entries, used when all keys are bytestrings	366	// compare hash entries, used when all keys are bytestrings
213	static int	367	static int
…		…
219	HE *b = *(HE **)b_;	373	HE *b = *(HE **)b_;
220		374
221	STRLEN la = HeKLEN (a);	375	STRLEN la = HeKLEN (a);
222	STRLEN lb = HeKLEN (b);	376	STRLEN lb = HeKLEN (b);
223		377
224	if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	378	if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))
225	cmp = la < lb ? -1 : la == lb ? 0 : 1;	379	cmp = la - lb;
226		380
227	return cmp;	381	return cmp;
228	}	382	}
229		383
230	// compare hash entries, used when some keys are sv's or utf-x	384	// compare hash entries, used when some keys are sv's or utf-x
…		…
237	static void	391	static void
238	encode_hv (enc_t *enc, HV *hv)	392	encode_hv (enc_t *enc, HV *hv)
239	{	393	{
240	int count, i;	394	int count, i;
241		395
		396	if (enc->indent >= enc->maxdepth)
		397	croak ("data structure too deep (hit recursion limit)");
		398
242	encode_ch (enc, '{'); NL; ++enc->indent;	399	encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
243		400
244	if ((count = hv_iterinit (hv)))	401	if ((count = hv_iterinit (hv)))
245	{	402	{
246	// for canonical output we have to sort by keys first	403	// for canonical output we have to sort by keys first
247	// actually, this is mostly due to the stupid so-called	404	// actually, this is mostly due to the stupid so-called
248	// security workaround added somewhere in 5.8.x.	405	// security workaround added somewhere in 5.8.x.
249	// that randomises hash orderings	406	// that randomises hash orderings
250	if (enc->flags & F_CANONICAL)	407	if (enc->json.flags & F_CANONICAL)
251	{	408	{
252	HE *he, *hes [count];
253	int fast = 1;	409	int fast = 1;
		410	HE *he;
		411	#if defined(__BORLANDC__) || defined(_MSC_VER)
		412	HE **hes = _alloca (count * sizeof (HE));
		413	#else
		414	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
		415	#endif
254		416
255	i = 0;	417	i = 0;
256	while ((he = hv_iternext (hv)))	418	while ((he = hv_iternext (hv)))
257	{	419	{
258	hes [i++] = he;	420	hes [i++] = he;
…		…
264		426
265	if (fast)	427	if (fast)
266	qsort (hes, count, sizeof (HE *), he_cmp_fast);	428	qsort (hes, count, sizeof (HE *), he_cmp_fast);
267	else	429	else
268	{	430	{
269	// hack to disable "use bytes"	431	// hack to forcefully disable "use bytes"
270	COP *oldcop = PL_curcop, cop;	432	COP cop = *PL_curcop;
271	cop.op_private = 0;	433	cop.op_private = 0;
		434
		435	ENTER;
		436	SAVETMPS;
		437
		438	SAVEVPTR (PL_curcop);
272	PL_curcop = &cop;	439	PL_curcop = &cop;
273		440
274	SAVETMPS;
275	qsort (hes, count, sizeof (HE *), he_cmp_slow);	441	qsort (hes, count, sizeof (HE *), he_cmp_slow);
		442
276	FREETMPS;	443	FREETMPS;
277		444	LEAVE;
278	PL_curcop = oldcop;
279	}	445	}
280		446
281	for (i = 0; i < count; ++i)	447	for (i = 0; i < count; ++i)
282	{	448	{
283	INDENT;	449	encode_indent (enc);
284	encode_he (enc, hes [i]);	450	encode_he (enc, hes [i]);
285		451
286	if (i < count - 1)	452	if (i < count - 1)
287	COMMA;	453	encode_comma (enc);
288	}
289
290	NL;	454	}
		455
		456	encode_nl (enc);
291	}	457	}
292	else	458	else
293	{	459	{
294	SV *sv;
295	HE *he = hv_iternext (hv);	460	HE *he = hv_iternext (hv);
296		461
297	for (;;)	462	for (;;)
298	{	463	{
299	INDENT;	464	encode_indent (enc);
300	encode_he (enc, he);	465	encode_he (enc, he);
301		466
302	if (!(he = hv_iternext (hv)))	467	if (!(he = hv_iternext (hv)))
303	break;	468	break;
304		469
305	COMMA;	470	encode_comma (enc);
306	}
307
308	NL;	471	}
		472
		473	encode_nl (enc);
309	}	474	}
310	}	475	}
311		476
312	--enc->indent; INDENT; encode_ch (enc, '}');	477	--enc->indent; encode_indent (enc); encode_ch (enc, '}');
		478	}
		479
		480	// encode objects, arrays and special \0=false and \1=true values.
		481	static void
		482	encode_rv (enc_t *enc, SV *sv)
		483	{
		484	svtype svt;
		485
		486	SvGETMAGIC (sv);
		487	svt = SvTYPE (sv);
		488
		489	if (expect_false (SvOBJECT (sv)))
		490	{
		491	HV *stash = !JSON_SLOW || json_boolean_stash
		492	? json_boolean_stash
		493	: gv_stashpv ("JSON::XS::Boolean", 1);
		494
		495	if (SvSTASH (sv) == stash)
		496	{
		497	if (SvIV (sv))
		498	encode_str (enc, "true", 4, 0);
		499	else
		500	encode_str (enc, "false", 5, 0);
		501	}
		502	else
		503	{
		504	#if 0
		505	if (0 && sv_derived_from (rv, "JSON::Literal"))
		506	{
		507	// not yet
		508	}
		509	#endif
		510	if (enc->json.flags & F_CONV_BLESSED)
		511	{
		512	// we re-bless the reference to get overload and other niceties right
		513	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
		514
		515	if (to_json)
		516	{
		517	dSP;
		518
		519	ENTER; SAVETMPS; PUSHMARK (SP);
		520	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		521
		522	// calling with G_SCALAR ensures that we always get a 1 return value
		523	PUTBACK;
		524	call_sv ((SV *)GvCV (to_json), G_SCALAR);
		525	SPAGAIN;
		526
		527	// catch this surprisingly common error
		528	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		529	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		530
		531	sv = POPs;
		532	PUTBACK;
		533
		534	encode_sv (enc, sv);
		535
		536	FREETMPS; LEAVE;
		537	}
		538	else if (enc->json.flags & F_ALLOW_BLESSED)
		539	encode_str (enc, "null", 4, 0);
		540	else
		541	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		542	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		543	}
		544	else if (enc->json.flags & F_ALLOW_BLESSED)
		545	encode_str (enc, "null", 4, 0);
		546	else
		547	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		548	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		549	}
		550	}
		551	else if (svt == SVt_PVHV)
		552	encode_hv (enc, (HV *)sv);
		553	else if (svt == SVt_PVAV)
		554	encode_av (enc, (AV *)sv);
		555	else if (svt < SVt_PVAV)
		556	{
		557	STRLEN len = 0;
		558	char *pv = svt ? SvPV (sv, len) : 0;
		559
		560	if (len == 1 && *pv == '1')
		561	encode_str (enc, "true", 4, 0);
		562	else if (len == 1 && *pv == '0')
		563	encode_str (enc, "false", 5, 0);
		564	else
		565	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		566	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		567	}
		568	else
		569	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		570	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
313	}	571	}
314		572
315	static void	573	static void
316	encode_sv (enc_t *enc, SV *sv)	574	encode_sv (enc_t *enc, SV *sv)
317	{	575	{
		576	SvGETMAGIC (sv);
		577
318	if (SvPOKp (sv))	578	if (SvPOKp (sv))
319	{	579	{
320	STRLEN len;	580	STRLEN len;
321	char *str = SvPV (sv, len);	581	char *str = SvPV (sv, len);
322	encode_ch (enc, '"');	582	encode_ch (enc, '"');
323	encode_str (enc, str, len, SvUTF8 (sv));	583	encode_str (enc, str, len, SvUTF8 (sv));
324	encode_ch (enc, '"');	584	encode_ch (enc, '"');
325	}	585	}
326	else if (SvNOKp (sv))	586	else if (SvNOKp (sv))
327	{	587	{
		588	// trust that perl will do the right thing w.r.t. JSON syntax.
328	need (enc, NV_DIG + 32);	589	need (enc, NV_DIG + 32);
329	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	590	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
330	enc->cur += strlen (enc->cur);	591	enc->cur += strlen (enc->cur);
331	}	592	}
332	else if (SvIOKp (sv))	593	else if (SvIOKp (sv))
333	{	594	{
334	need (enc, 64);	595	// we assume we can always read an IV as a UV
		596	if (SvUV (sv) & ~(UV)0x7fff)
		597	{
		598	// large integer, use the (rather slow) snprintf way.
		599	need (enc, sizeof (UV) * 3);
335	enc->cur +=	600	enc->cur +=
336	SvIsUV(sv)	601	SvIsUV(sv)
337	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	602	? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
338	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	603	: snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
		604	}
		605	else
		606	{
		607	// optimise the "small number case"
		608	// code will likely be branchless and use only a single multiplication
		609	I32 i = SvIV (sv);
		610	U32 u;
		611	char digit, nz = 0;
		612
		613	need (enc, 6);
		614
		615	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		616	u = i < 0 ? -i : i;
		617
		618	// convert to 4.28 fixed-point representation
		619	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		620
		621	// now output digit by digit, each time masking out the integer part
		622	// and multiplying by 5 while moving the decimal point one to the right,
		623	// resulting in a net multiplication by 10.
		624	// we always write the digit to memory but conditionally increment
		625	// the pointer, to ease the usage of conditional move instructions.
		626	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
		627	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
		628	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
		629	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
		630	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		631	}
339	}	632	}
340	else if (SvROK (sv))	633	else if (SvROK (sv))
341	{	634	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))	635	else if (!SvOK (sv))
357	encode_str (enc, "null", 4, 0);	636	encode_str (enc, "null", 4, 0);
358	else	637	else
359	croak ("encountered perl type that JSON cannot handle");	638	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
		639	SvPV_nolen (sv), SvFLAGS (sv));
360	}	640	}
361		641
362	static SV *	642	static SV *
363	encode_json (SV *scalar, UV flags)	643	encode_json (SV *scalar, JSON *json)
364	{	644	{
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;	645	enc_t enc;
369	enc.flags = flags;	646
		647	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
		648	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
		649
		650	enc.json = *json;
370	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	651	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
371	enc.cur = SvPVX (enc.sv);	652	enc.cur = SvPVX (enc.sv);
372	enc.end = SvEND (enc.sv);	653	enc.end = SvEND (enc.sv);
373	enc.max_recurse = 0;
374	enc.indent = 0;	654	enc.indent = 0;
		655	enc.maxdepth = DEC_DEPTH (enc.json.flags);
375		656
376	SvPOK_only (enc.sv);	657	SvPOK_only (enc.sv);
377	encode_sv (&enc, scalar);	658	encode_sv (&enc, scalar);
378		659
		660	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		661	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		662
379	if (!(flags & (F_ASCII | F_UTF8)))	663	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
380	SvUTF8_on (enc.sv);	664	SvUTF8_on (enc.sv);
381		665
382	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));	666	if (enc.json.flags & F_SHRINK)
		667	shrink (enc.sv);
		668
383	return enc.sv;	669	return enc.sv;
384	}	670	}
385		671
386	/////////////////////////////////////////////////////////////////////////////	672	/////////////////////////////////////////////////////////////////////////////
		673	// decoder
387		674
388	#define WS \	675	// structure used for decoding JSON
		676	typedef struct
		677	{
		678	char *cur; // current parser pointer
		679	char *end; // end of input string
		680	const char *err; // parse error, if != 0
		681	JSON json;
		682	U32 depth; // recursion depth
		683	U32 maxdepth; // recursion depth limit
		684	} dec_t;
		685
		686	inline void
		687	decode_ws (dec_t *dec)
		688	{
389	for (;;) \	689	for (;;)
390	{ \	690	{
391	char ch = *dec->cur; \	691	char ch = *dec->cur;
		692
392	if (ch > 0x20 \	693	if (ch > 0x20
393	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	694	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
394	break; \	695	break;
		696
395	++dec->cur; \	697	++dec->cur;
396	}	698	}
		699	}
397		700
398	#define ERR(reason) SB dec->err = reason; goto fail; SE	701	#define ERR(reason) SB dec->err = reason; goto fail; SE
		702
399	#define EXPECT_CH(ch) SB \	703	#define EXPECT_CH(ch) SB \
400	if (*dec->cur != ch) \	704	if (*dec->cur != ch) \
401	ERR (# ch " expected"); \	705	ERR (# ch " expected"); \
402	++dec->cur; \	706	++dec->cur; \
403	SE	707	SE
404		708
		709	#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
		710	#define DEC_DEC_DEPTH --dec->depth
		711
405	static SV *decode_sv (dec_t *dec);	712	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		713
412	static signed char decode_hexdigit[256];	714	static signed char decode_hexdigit[256];
413		715
414	static UV	716	static UV
415	decode_4hex (dec_t *dec)	717	decode_4hex (dec_t *dec)
416	{	718	{
417	signed char d1, d2, d3, d4;	719	signed char d1, d2, d3, d4;
		720	unsigned char *cur = (unsigned char *)dec->cur;
418		721
419	d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]];	722	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");	723	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]];	724	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");	725	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		726
428	dec->cur += 4;	727	dec->cur += 4;
429		728
430	return ((UV)d1) << 12	729	return ((UV)d1) << 12
431	| ((UV)d2) << 8	730	| ((UV)d2) << 8
…		…
437	}	736	}
438		737
439	static SV *	738	static SV *
440	decode_str (dec_t *dec)	739	decode_str (dec_t *dec)
441	{	740	{
442	SV *sv = NEWSV (0,2);	741	SV *sv = 0;
443	STRLEN cur = 0;
444	int utf8 = 0;	742	int utf8 = 0;
		743	char *dec_cur = dec->cur;
445		744
446	for (;;)	745	do
447	{	746	{
448	unsigned char ch = *(unsigned char *)dec->cur;	747	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		748	char *cur = buf;
449		749
450	if (ch == '"')	750	do
451	break;
452	else if (ch == '\\')
453	{	751	{
454	switch (*++dec->cur)	752	unsigned char ch = *(unsigned char *)dec_cur++;
		753
		754	if (expect_false (ch == '"'))
		755	{
		756	--dec_cur;
		757	break;
455	{	758	}
456	case '\\':	759	else if (expect_false (ch == '\\'))
457	case '/':	760	{
458	case '"': APPEND_CH (*dec->cur++); break;	761	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	{	762	{
468	UV lo, hi;	763	case '\\':
469	++dec->cur;	764	case '/':
		765	case '"': *cur++ = *dec_cur++; break;
470		766
471	hi = decode_4hex (dec);	767	case 'b': ++dec_cur; *cur++ = '\010'; break;
472	if (hi == (UV)-1)	768	case 't': ++dec_cur; *cur++ = '\011'; break;
473	goto fail;	769	case 'n': ++dec_cur; *cur++ = '\012'; break;
		770	case 'f': ++dec_cur; *cur++ = '\014'; break;
		771	case 'r': ++dec_cur; *cur++ = '\015'; break;
474		772
475	// possibly a surrogate pair	773	case 'u':
476	if (hi >= 0xd800 && hi < 0xdc00)
477	{	774	{
478	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	775	UV lo, hi;
479	ERR ("illegal surrogate character");	776	++dec_cur;
480		777
481	dec->cur += 2;	778	dec->cur = dec_cur;
482
483	lo = decode_4hex (dec);	779	hi = decode_4hex (dec);
		780	dec_cur = dec->cur;
484	if (lo == (UV)-1)	781	if (hi == (UV)-1)
485	goto fail;	782	goto fail;
486		783
		784	// possibly a surrogate pair
		785	if (hi >= 0xd800)
		786	if (hi < 0xdc00)
		787	{
		788	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
		789	ERR ("missing low surrogate character in surrogate pair");
		790
		791	dec_cur += 2;
		792
		793	dec->cur = dec_cur;
		794	lo = decode_4hex (dec);
		795	dec_cur = dec->cur;
		796	if (lo == (UV)-1)
		797	goto fail;
		798
487	if (lo < 0xdc00 || lo >= 0xe000)	799	if (lo < 0xdc00 || lo >= 0xe000)
488	ERR ("surrogate pair expected");	800	ERR ("surrogate pair expected");
489		801
490	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;	802	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
		803	}
		804	else if (hi < 0xe000)
		805	ERR ("missing high surrogate character in surrogate pair");
		806
		807	if (hi >= 0x80)
		808	{
		809	utf8 = 1;
		810
		811	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
		812	}
		813	else
		814	*cur++ = hi;
491	}	815	}
492	else if (lo >= 0xdc00 && lo < 0xe000)
493	ERR ("illegal surrogate character");
494
495	if (hi >= 0x80)
496	{	816	break;
497	utf8 = 1;
498		817
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	818	default:
503	APPEND_CH (hi);	819	--dec_cur;
		820	ERR ("illegal backslash escape sequence in string");
504	}	821	}
		822	}
		823	else if (expect_true (ch >= 0x20 && ch <= 0x7f))
		824	*cur++ = ch;
		825	else if (ch >= 0x80)
		826	{
		827	STRLEN clen;
		828	UV uch;
		829
		830	--dec_cur;
		831
		832	uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		833	if (clen == (STRLEN)-1)
		834	ERR ("malformed UTF-8 character in JSON string");
		835
		836	do
		837	*cur++ = *dec_cur++;
		838	while (--clen);
		839
		840	utf8 = 1;
		841	}
		842	else
		843	{
		844	--dec_cur;
		845
		846	if (!ch)
		847	ERR ("unexpected end of string while parsing JSON string");
505	break;	848	else
		849	ERR ("invalid character encountered while parsing JSON string");
506	}	850	}
507	}	851	}
508	else if (ch >= 0x20 && ch <= 0x7f)	852	while (cur < buf + SHORT_STRING_LEN);
509	APPEND_CH (*dec->cur++);	853
510	else if (ch >= 0x80)	854	{
		855	STRLEN len = cur - buf;
		856
		857	if (sv)
511	{	858	{
512	STRLEN clen;	859	SvGROW (sv, SvCUR (sv) + len + 1);
513	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);	860	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
514	if (clen < 0)	861	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	}	862	}
521	else	863	else
522	ERR ("invalid character encountered");	864	sv = newSVpvn (buf, len);
523	}	865	}
		866	}
		867	while (*dec_cur != '"');
524		868
525	++dec->cur;	869	++dec_cur;
526		870
		871	if (sv)
		872	{
527	SvPOK_only (sv);	873	SvPOK_only (sv);
528
529	SvCUR_set (sv, cur);
530	*SvEND (sv) = 0;	874	*SvEND (sv) = 0;
531		875
532	if (utf8)	876	if (utf8)
533	SvUTF8_on (sv);	877	SvUTF8_on (sv);
		878	}
		879	else
		880	sv = newSVpvn ("", 0);
534		881
		882	dec->cur = dec_cur;
535	return sv;	883	return sv;
536		884
537	fail:	885	fail:
538	SvREFCNT_dec (sv);	886	dec->cur = dec_cur;
539	return 0;	887	return 0;
540	}	888	}
541		889
542	static SV *	890	static SV *
543	decode_num (dec_t *dec)	891	decode_num (dec_t *dec)
…		…
553	{	901	{
554	++dec->cur;	902	++dec->cur;
555	if (*dec->cur >= '0' && *dec->cur <= '9')	903	if (*dec->cur >= '0' && *dec->cur <= '9')
556	ERR ("malformed number (leading zero must not be followed by another digit)");	904	ERR ("malformed number (leading zero must not be followed by another digit)");
557	}	905	}
558		906	else if (*dec->cur < '0' || *dec->cur > '9')
559	// int	907	ERR ("malformed number (no digits after initial minus)");
		908	else
		909	do
		910	{
		911	++dec->cur;
		912	}
560	while (*dec->cur >= '0' && *dec->cur <= '9')	913	while (*dec->cur >= '0' && *dec->cur <= '9');
561	++dec->cur;
562		914
563	// [frac]	915	// [frac]
564	if (*dec->cur == '.')	916	if (*dec->cur == '.')
565	{	917	{
566	is_nv = 1;	918	++dec->cur;
		919
		920	if (*dec->cur < '0' || *dec->cur > '9')
		921	ERR ("malformed number (no digits after decimal point)");
567		922
568	do	923	do
569	{	924	{
570	++dec->cur;	925	++dec->cur;
571	}	926	}
572	while (*dec->cur >= '0' && *dec->cur <= '9');	927	while (*dec->cur >= '0' && *dec->cur <= '9');
		928
		929	is_nv = 1;
573	}	930	}
574		931
575	// [exp]	932	// [exp]
576	if (*dec->cur == 'e' || *dec->cur == 'E')	933	if (*dec->cur == 'e' || *dec->cur == 'E')
577	{	934	{
578	is_nv = 1;
579
580	++dec->cur;	935	++dec->cur;
		936
581	if (*dec->cur == '-' || *dec->cur == '+')	937	if (*dec->cur == '-' || *dec->cur == '+')
582	++dec->cur;	938	++dec->cur;
583		939
		940	if (*dec->cur < '0' || *dec->cur > '9')
		941	ERR ("malformed number (no digits after exp sign)");
		942
		943	do
		944	{
		945	++dec->cur;
		946	}
584	while (*dec->cur >= '0' && *dec->cur <= '9')	947	while (*dec->cur >= '0' && *dec->cur <= '9');
585	++dec->cur;	948
		949	is_nv = 1;
586	}	950	}
587		951
588	if (!is_nv)	952	if (!is_nv)
589	{	953	{
590	UV uv;	954	int len = dec->cur - start;
591	int numtype = grok_number (start, dec->cur - start, &uv);	955
592	if (numtype & IS_NUMBER_IN_UV)	956	// special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
593	if (numtype & IS_NUMBER_NEG)	957	if (*start == '-')
		958	switch (len)
594	{	959	{
595	if (uv < (UV)IV_MIN)	960	case 2: return newSViv (-( start [1] - '0' * 1));
596	return newSViv (-(IV)uv);	961	case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
		962	case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		963	case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
597	}	964	}
		965	else
		966	switch (len)
		967	{
		968	case 1: return newSViv ( start [0] - '0' * 1);
		969	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		970	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		971	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		972	}
		973
		974	{
		975	UV uv;
		976	int numtype = grok_number (start, len, &uv);
		977	if (numtype & IS_NUMBER_IN_UV)
		978	if (numtype & IS_NUMBER_NEG)
		979	{
		980	if (uv < (UV)IV_MIN)
		981	return newSViv (-(IV)uv);
		982	}
598	else	983	else
599	return newSVuv (uv);	984	return newSVuv (uv);
600	}	985	}
601		986
		987	len -= *start == '-' ? 1 : 0;
		988
		989	// does not fit into IV or UV, try NV
		990	if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len)
		991	#if defined (LDBL_DIG)
		992	|| (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len)
		993	#endif
		994	)
		995	// fits into NV without loss of precision
		996	return newSVnv (Atof (start));
		997
		998	// everything else fails, convert it to a string
		999	return newSVpvn (start, dec->cur - start);
		1000	}
		1001
		1002	// loss of precision here
602	return newSVnv (Atof (start));	1003	return newSVnv (Atof (start));
603		1004
604	fail:	1005	fail:
605	return 0;	1006	return 0;
606	}	1007	}
…		…
608	static SV *	1009	static SV *
609	decode_av (dec_t *dec)	1010	decode_av (dec_t *dec)
610	{	1011	{
611	AV *av = newAV ();	1012	AV *av = newAV ();
612		1013
		1014	DEC_INC_DEPTH;
		1015	decode_ws (dec);
		1016
		1017	if (*dec->cur == ']')
		1018	++dec->cur;
		1019	else
613	for (;;)	1020	for (;;)
614	{	1021	{
615	SV *value;	1022	SV *value;
616		1023
617	value = decode_sv (dec);	1024	value = decode_sv (dec);
618	if (!value)	1025	if (!value)
619	goto fail;	1026	goto fail;
620		1027
621	av_push (av, value);	1028	av_push (av, value);
622		1029
623	WS;	1030	decode_ws (dec);
624		1031
625	if (*dec->cur == ']')	1032	if (*dec->cur == ']')
626	{	1033	{
627	++dec->cur;	1034	++dec->cur;
628	break;	1035	break;
		1036	}
629	}	1037
630
631	if (*dec->cur != ',')	1038	if (*dec->cur != ',')
632	ERR (", or ] expected while parsing array");	1039	ERR (", or ] expected while parsing array");
633		1040
634	++dec->cur;	1041	++dec->cur;
635	}	1042	}
636		1043
		1044	DEC_DEC_DEPTH;
637	return newRV_noinc ((SV *)av);	1045	return newRV_noinc ((SV *)av);
638		1046
639	fail:	1047	fail:
640	SvREFCNT_dec (av);	1048	SvREFCNT_dec (av);
		1049	DEC_DEC_DEPTH;
641	return 0;	1050	return 0;
642	}	1051	}
643		1052
644	static SV *	1053	static SV *
645	decode_hv (dec_t *dec)	1054	decode_hv (dec_t *dec)
646	{	1055	{
		1056	SV *sv;
647	HV *hv = newHV ();	1057	HV *hv = newHV ();
648		1058
		1059	DEC_INC_DEPTH;
		1060	decode_ws (dec);
		1061
		1062	if (*dec->cur == '}')
		1063	++dec->cur;
		1064	else
649	for (;;)	1065	for (;;)
650	{	1066	{
651	SV *key, *value;	1067	decode_ws (dec); EXPECT_CH ('"');
652		1068
653	WS; EXPECT_CH ('"');	1069	// heuristic: assume that
654		1070	// a) decode_str + hv_store_ent are abysmally slow.
655	key = decode_str (dec);	1071	// b) most hash keys are short, simple ascii text.
656	if (!key)	1072	// => try to "fast-match" such strings to avoid
657	goto fail;	1073	// the overhead of decode_str + hv_store_ent.
658
659	WS; EXPECT_CH (':');
660
661	value = decode_sv (dec);
662	if (!value)
663	{	1074	{
		1075	SV *value;
		1076	char *p = dec->cur;
		1077	char *e = p + 24; // only try up to 24 bytes
		1078
		1079	for (;;)
		1080	{
		1081	// the >= 0x80 is true on most architectures
		1082	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1083	{
		1084	// slow path, back up and use decode_str
		1085	SV *key = decode_str (dec);
		1086	if (!key)
		1087	goto fail;
		1088
		1089	decode_ws (dec); EXPECT_CH (':');
		1090
		1091	value = decode_sv (dec);
		1092	if (!value)
		1093	{
		1094	SvREFCNT_dec (key);
		1095	goto fail;
		1096	}
		1097
		1098	hv_store_ent (hv, key, value, 0);
664	SvREFCNT_dec (key);	1099	SvREFCNT_dec (key);
		1100
		1101	break;
		1102	}
		1103	else if (*p == '"')
		1104	{
		1105	// fast path, got a simple key
		1106	char *key = dec->cur;
		1107	int len = p - key;
		1108	dec->cur = p + 1;
		1109
		1110	decode_ws (dec); EXPECT_CH (':');
		1111
		1112	value = decode_sv (dec);
		1113	if (!value)
665	goto fail;	1114	goto fail;
		1115
		1116	hv_store (hv, key, len, value, 0);
		1117
		1118	break;
		1119	}
		1120
		1121	++p;
		1122	}
666	}	1123	}
667		1124
668	//TODO: optimise	1125	decode_ws (dec);
669	hv_store_ent (hv, key, value, 0);
670		1126
671	WS;
672
673	if (*dec->cur == '}')	1127	if (*dec->cur == '}')
		1128	{
		1129	++dec->cur;
		1130	break;
		1131	}
		1132
		1133	if (*dec->cur != ',')
		1134	ERR (", or } expected while parsing object/hash");
		1135
		1136	++dec->cur;
		1137	}
		1138
		1139	DEC_DEC_DEPTH;
		1140	sv = newRV_noinc ((SV *)hv);
		1141
		1142	// check filter callbacks
		1143	if (dec->json.flags & F_HOOK)
		1144	{
		1145	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
674	{	1146	{
675	++dec->cur;	1147	HE *cb, *he;
676	break;	1148
		1149	hv_iterinit (hv);
		1150	he = hv_iternext (hv);
		1151	hv_iterinit (hv);
		1152
		1153	// the next line creates a mortal sv each time its called.
		1154	// might want to optimise this for common cases.
		1155	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1156
		1157	if (cb)
		1158	{
		1159	dSP;
		1160	int count;
		1161
		1162	ENTER; SAVETMPS; PUSHMARK (SP);
		1163	XPUSHs (HeVAL (he));
		1164
		1165	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1166
		1167	if (count == 1)
		1168	{
		1169	sv = newSVsv (POPs);
		1170	FREETMPS; LEAVE;
		1171	return sv;
		1172	}
		1173
		1174	FREETMPS; LEAVE;
		1175	}
677	}	1176	}
678		1177
679	if (*dec->cur != ',')	1178	if (dec->json.cb_object)
680	ERR (", or } expected while parsing object/hash");	1179	{
		1180	dSP;
		1181	int count;
681		1182
682	++dec->cur;	1183	ENTER; SAVETMPS; PUSHMARK (SP);
683	}	1184	XPUSHs (sv_2mortal (sv));
684		1185
685	return newRV_noinc ((SV *)hv);	1186	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1187
		1188	if (count == 1)
		1189	{
		1190	sv = newSVsv (POPs);
		1191	FREETMPS; LEAVE;
		1192	return sv;
		1193	}
		1194
		1195	SvREFCNT_inc (sv);
		1196	FREETMPS; LEAVE;
		1197	}
		1198	}
		1199
		1200	return sv;
686		1201
687	fail:	1202	fail:
688	SvREFCNT_dec (hv);	1203	SvREFCNT_dec (hv);
		1204	DEC_DEC_DEPTH;
689	return 0;	1205	return 0;
690	}	1206	}
691		1207
692	static SV *	1208	static SV *
693	decode_sv (dec_t *dec)	1209	decode_sv (dec_t *dec)
694	{	1210	{
695	WS;	1211	decode_ws (dec);
		1212
		1213	// the beauty of JSON: you need exactly one character lookahead
		1214	// to parse anything.
696	switch (*dec->cur)	1215	switch (*dec->cur)
697	{	1216	{
698	case '"': ++dec->cur; return decode_str (dec);	1217	case '"': ++dec->cur; return decode_str (dec);
699	case '[': ++dec->cur; return decode_av (dec);	1218	case '[': ++dec->cur; return decode_av (dec);
700	case '{': ++dec->cur; return decode_hv (dec);	1219	case '{': ++dec->cur; return decode_hv (dec);
…		…
706		1225
707	case 't':	1226	case 't':
708	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1227	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
709	{	1228	{
710	dec->cur += 4;	1229	dec->cur += 4;
711	return newSViv (1);	1230	return SvREFCNT_inc (json_true);
712	}	1231	}
713	else	1232	else
714	ERR ("'true' expected");	1233	ERR ("'true' expected");
715		1234
716	break;	1235	break;
717		1236
718	case 'f':	1237	case 'f':
719	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1238	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
720	{	1239	{
721	dec->cur += 5;	1240	dec->cur += 5;
722	return newSViv (0);	1241	return SvREFCNT_inc (json_false);
723	}	1242	}
724	else	1243	else
725	ERR ("'false' expected");	1244	ERR ("'false' expected");
726		1245
727	break;	1246	break;
728		1247
729	case 'n':	1248	case 'n':
730	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))	1249	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))
731	{	1250	{
732	dec->cur += 4;	1251	dec->cur += 4;
733	return newSViv (1);	1252	return newSVsv (&PL_sv_undef);
734	}	1253	}
735	else	1254	else
736	ERR ("'null' expected");	1255	ERR ("'null' expected");
737		1256
738	break;	1257	break;
739		1258
740	default:	1259	default:
741	ERR ("malformed json string");	1260	ERR ("malformed JSON string, neither array, object, number, string or atom");
742	break;	1261	break;
743	}	1262	}
744		1263
745	fail:	1264	fail:
746	return 0;	1265	return 0;
747	}	1266	}
748		1267
749	static SV *	1268	static SV *
750	decode_json (SV *string, UV flags)	1269	decode_json (SV *string, JSON *json, UV *offset_return)
751	{	1270	{
		1271	dec_t dec;
		1272	UV offset;
752	SV *sv;	1273	SV *sv;
753		1274
		1275	SvGETMAGIC (string);
		1276	SvUPGRADE (string, SVt_PV);
		1277
		1278	if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
		1279	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1280	(unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
		1281
754	if (!(flags & F_UTF8))	1282	if (json->flags & F_UTF8)
		1283	sv_utf8_downgrade (string, 0);
		1284	else
755	sv_utf8_upgrade (string);	1285	sv_utf8_upgrade (string);
756		1286
757	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1287	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
758		1288
759	dec_t dec;	1289	dec.json = *json;
760	dec.flags = flags;
761	dec.cur = SvPVX (string);	1290	dec.cur = SvPVX (string);
762	dec.end = SvEND (string);	1291	dec.end = SvEND (string);
763	dec.err = 0;	1292	dec.err = 0;
		1293	dec.depth = 0;
		1294	dec.maxdepth = DEC_DEPTH (dec.json.flags);
764		1295
765	*dec.end = 1; // invalid anywhere	1296	if (dec.json.cb_object || dec.json.cb_sk_object)
		1297	dec.json.flags |= F_HOOK;
		1298
		1299	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
766	sv = decode_sv (&dec);	1300	sv = decode_sv (&dec);
767	*dec.end = 0;	1301
		1302	if (!(offset_return || !sv))
		1303	{
		1304	// check for trailing garbage
		1305	decode_ws (&dec);
		1306
		1307	if (*dec.cur)
		1308	{
		1309	dec.err = "garbage after JSON object";
		1310	SvREFCNT_dec (sv);
		1311	sv = 0;
		1312	}
		1313	}
		1314
		1315	if (offset_return || !sv)
		1316	{
		1317	offset = dec.json.flags & F_UTF8
		1318	? dec.cur - SvPVX (string)
		1319	: utf8_distance (dec.cur, SvPVX (string));
		1320
		1321	if (offset_return)
		1322	*offset_return = offset;
		1323	}
768		1324
769	if (!sv)	1325	if (!sv)
770	{	1326	{
771	IV offset = utf8_distance (dec.cur, SvPVX (string));
772	SV *uni = sv_newmortal ();	1327	SV *uni = sv_newmortal ();
773		1328
		1329	// horrible hack to silence warning inside pv_uni_display
		1330	COP cop = *PL_curcop;
		1331	cop.cop_warnings = pWARN_NONE;
		1332	ENTER;
		1333	SAVEVPTR (PL_curcop);
		1334	PL_curcop = &cop;
774	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1335	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
		1336	LEAVE;
		1337
775	croak ("%s, at character %d (%s)",	1338	croak ("%s, at character offset %d [\"%s\"]",
776	dec.err,	1339	dec.err,
777	(int)offset,	1340	(int)offset,
778	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1341	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
779	}	1342	}
780		1343
781	sv = sv_2mortal (sv);	1344	sv = sv_2mortal (sv);
782		1345
783	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1346	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)");	1347	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
785		1348
786	return sv;	1349	return sv;
787	}	1350	}
788		1351
		1352	/////////////////////////////////////////////////////////////////////////////
		1353	// XS interface functions
		1354
789	MODULE = JSON::XS PACKAGE = JSON::XS	1355	MODULE = JSON::XS PACKAGE = JSON::XS
790		1356
791	BOOT:	1357	BOOT:
792	{	1358	{
793	int i;	1359	int i;
794		1360
795	memset (decode_hexdigit, 0xff, 256);
796	for (i = 10; i--; )	1361	for (i = 0; i < 256; ++i)
797	decode_hexdigit ['0' + i] = i;	1362	decode_hexdigit [i] =
		1363	i >= '0' && i <= '9' ? i - '0'
		1364	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1365	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1366	: -1;
798		1367
799	for (i = 6; --i; )	1368	json_stash = gv_stashpv ("JSON::XS" , 1);
		1369	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1370
		1371	json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
		1372	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1373	}
		1374
		1375	PROTOTYPES: DISABLE
		1376
		1377	void CLONE (...)
		1378	CODE:
		1379	json_stash = 0;
		1380	json_boolean_stash = 0;
		1381
		1382	void new (char *klass)
		1383	PPCODE:
		1384	{
		1385	SV *pv = NEWSV (0, sizeof (JSON));
		1386	SvPOK_only (pv);
		1387	Zero (SvPVX (pv), 1, JSON);
		1388	((JSON *)SvPVX (pv))->flags = F_DEFAULT;
		1389	XPUSHs (sv_2mortal (sv_bless (newRV_noinc (pv), JSON_STASH)));
		1390	}
		1391
		1392	void ascii (JSON *self, int enable = 1)
		1393	ALIAS:
		1394	ascii = F_ASCII
		1395	latin1 = F_LATIN1
		1396	utf8 = F_UTF8
		1397	indent = F_INDENT
		1398	canonical = F_CANONICAL
		1399	space_before = F_SPACE_BEFORE
		1400	space_after = F_SPACE_AFTER
		1401	pretty = F_PRETTY
		1402	allow_nonref = F_ALLOW_NONREF
		1403	shrink = F_SHRINK
		1404	allow_blessed = F_ALLOW_BLESSED
		1405	convert_blessed = F_CONV_BLESSED
		1406	PPCODE:
		1407	{
		1408	if (enable)
		1409	self->flags |= ix;
		1410	else
		1411	self->flags &= ~ix;
		1412
		1413	XPUSHs (ST (0));
		1414	}
		1415
		1416	void max_depth (JSON *self, UV max_depth = 0x80000000UL)
		1417	PPCODE:
		1418	{
		1419	UV log2 = 0;
		1420
		1421	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
		1422
		1423	while ((1UL << log2) < max_depth)
		1424	++log2;
		1425
		1426	self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
		1427
		1428	XPUSHs (ST (0));
		1429	}
		1430
		1431	void max_size (JSON *self, UV max_size = 0)
		1432	PPCODE:
		1433	{
		1434	UV log2 = 0;
		1435
		1436	if (max_size > 0x80000000UL) max_size = 0x80000000UL;
		1437	if (max_size == 1) max_size = 2;
		1438
		1439	while ((1UL << log2) < max_size)
		1440	++log2;
		1441
		1442	self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
		1443
		1444	XPUSHs (ST (0));
		1445	}
		1446
		1447	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
		1448	PPCODE:
		1449	{
		1450	SvREFCNT_dec (self->cb_object);
		1451	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
		1452
		1453	XPUSHs (ST (0));
		1454	}
		1455
		1456	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
		1457	PPCODE:
		1458	{
		1459	if (!self->cb_sk_object)
		1460	self->cb_sk_object = newHV ();
		1461
		1462	if (SvOK (cb))
		1463	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1464	else
800	{	1465	{
801	decode_hexdigit ['a' + i] = 10 + i;	1466	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
802	decode_hexdigit ['A' + i] = 10 + i;	1467
		1468	if (!HvKEYS (self->cb_sk_object))
		1469	{
		1470	SvREFCNT_dec (self->cb_sk_object);
		1471	self->cb_sk_object = 0;
		1472	}
803	}	1473	}
804		1474
805	json_stash = gv_stashpv ("JSON::XS", 1);	1475	XPUSHs (ST (0));
806	}	1476	}
807		1477
808	SV *new (char *dummy)	1478	void encode (JSON *self, SV *scalar)
		1479	PPCODE:
		1480	XPUSHs (encode_json (scalar, self));
		1481
		1482	void decode (JSON *self, SV *jsonstr)
		1483	PPCODE:
		1484	XPUSHs (decode_json (jsonstr, self, 0));
		1485
		1486	void decode_prefix (JSON *self, SV *jsonstr)
		1487	PPCODE:
		1488	{
		1489	UV offset;
		1490	EXTEND (SP, 2);
		1491	PUSHs (decode_json (jsonstr, self, &offset));
		1492	PUSHs (sv_2mortal (newSVuv (offset)));
		1493	}
		1494
		1495	void DESTROY (JSON *self)
809	CODE:	1496	CODE:
810	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1497	SvREFCNT_dec (self->cb_sk_object);
811	OUTPUT:	1498	SvREFCNT_dec (self->cb_object);
812	RETVAL
813		1499
814	SV *ascii (SV *self, int enable)	1500	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		1501
846	void to_json (SV *scalar)	1502	void to_json (SV *scalar)
847	PPCODE:	1503	PPCODE:
		1504	{
		1505	JSON json = { F_DEFAULT | F_UTF8 };
848	XPUSHs (encode_json (scalar, F_UTF8));	1506	XPUSHs (encode_json (scalar, &json));
		1507	}
849		1508
850	void from_json (SV *jsonstr)	1509	void from_json (SV *jsonstr)
851	PPCODE:	1510	PPCODE:
		1511	{
		1512	JSON json = { F_DEFAULT | F_UTF8 };
852	XPUSHs (decode_json (jsonstr, F_UTF8));	1513	XPUSHs (decode_json (jsonstr, &json, 0));
		1514	}
853		1515

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