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Comparing JSON-XS/XS.xs (file contents):
Revision 1.5 by root, Thu Mar 22 23:24:18 2007 UTC vs.
Revision 1.58 by root, Mon Aug 13 16:06:25 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	#else
		66	# define JSON_SLOW 0
		67	#endif
		68
		69	static HV *json_stash, *json_boolean_stash; // JSON::XS::
		70	static SV *json_true, *json_false;
		71
		72	typedef struct {
		73	U32 flags;
		74	SV *cb_object;
		75	HV *cb_sk_object;
		76	} JSON;
		77
		78	/////////////////////////////////////////////////////////////////////////////
		79	// utility functions
		80
		81	inline void
		82	shrink (SV *sv)
		83	{
		84	sv_utf8_downgrade (sv, 1);
		85	if (SvLEN (sv) > SvCUR (sv) + 1)
		86	{
		87	#ifdef SvPV_shrink_to_cur
		88	SvPV_shrink_to_cur (sv);
		89	#elif defined (SvPV_renew)
		90	SvPV_renew (sv, SvCUR (sv) + 1);
		91	#endif
		92	}
		93	}
		94
		95	// decode an utf-8 character and return it, or (UV)-1 in
		96	// case of an error.
		97	// we special-case "safe" characters from U+80 .. U+7FF,
		98	// but use the very good perl function to parse anything else.
		99	// note that we never call this function for a ascii codepoints
		100	inline UV
		101	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
		102	{
		103	if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
		104	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		105	else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
		106	{
		107	*clen = 2;
		108	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
		109	}
		110	else
		111	{
		112	*clen = (STRLEN)-1;
		113	return (UV)-1;
		114	}
		115	}
		116
		117	/////////////////////////////////////////////////////////////////////////////
		118	// encoder
27		119
28	// structure used for encoding JSON	120	// structure used for encoding JSON
29	typedef struct	121	typedef struct
30	{	122	{
31	char *cur;	123	char *cur; // SvPVX (sv) + current output position
32	STRLEN len; // SvLEN (sv)
33	char *end; // SvEND (sv)	124	char *end; // SvEND (sv)
34	SV *sv;	125	SV *sv; // result scalar
35	UV flags;	126	JSON json;
36	int max_recurse;	127	U32 indent; // indentation level
37	int indent;	128	U32 maxdepth; // max. indentation/recursion level
38	} enc_t;	129	} enc_t;
39		130
40	// structure used for decoding JSON	131	inline void
41	typedef struct
42	{
43	char *cur;
44	char *end;
45	const 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)	132	need (enc_t *enc, STRLEN len)
62	{	133	{
63	if (enc->cur + len >= enc->end)	134	if (expect_false (enc->cur + len >= enc->end))
64	{	135	{
65	STRLEN cur = enc->cur - SvPVX (enc->sv);	136	STRLEN cur = enc->cur - SvPVX (enc->sv);
66	SvGROW (enc->sv, cur + len + 1);	137	SvGROW (enc->sv, cur + len + 1);
67	enc->cur = SvPVX (enc->sv) + cur;	138	enc->cur = SvPVX (enc->sv) + cur;
68	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv);	139	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
69	}	140	}
70	}	141	}
71		142
72	static void	143	inline void
73	encode_ch (enc_t *enc, char ch)	144	encode_ch (enc_t *enc, char ch)
74	{	145	{
75	need (enc, 1);	146	need (enc, 1);
76	*enc->cur++ = ch;	147	*enc->cur++ = ch;
77	}	148	}
…		…
85		156
86	while (str < end)	157	while (str < end)
87	{	158	{
88	unsigned char ch = *(unsigned char *)str;	159	unsigned char ch = *(unsigned char *)str;
89		160
90	if (ch == '"')	161	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
91	{	162	{
		163	if (expect_false (ch == '"')) // but with slow exceptions
		164	{
92	need (enc, len += 1);	165	need (enc, len += 1);
93	*enc->cur++ = '\\';	166	*enc->cur++ = '\\';
94	*enc->cur++ = '"';	167	*enc->cur++ = '"';
95	++str;
96	}	168	}
97	else if (ch == '\\')	169	else if (expect_false (ch == '\\'))
98	{	170	{
99	need (enc, len += 1);	171	need (enc, len += 1);
100	*enc->cur++ = '\\';	172	*enc->cur++ = '\\';
101	*enc->cur++ = '\\';	173	*enc->cur++ = '\\';
102	++str;
103	}	174	}
104	else if (ch >= 0x20 && ch < 0x80) // most common case	175	else
105	{
106	*enc->cur++ = ch;	176	*enc->cur++ = ch;
107	++str;	177
108	}
109	else if (ch == '\015')
110	{
111	need (enc, len += 1);
112	*enc->cur++ = '\\';
113	*enc->cur++ = 'r';
114	++str;
115	}
116	else if (ch == '\012')
117	{
118	need (enc, len += 1);
119	*enc->cur++ = '\\';
120	*enc->cur++ = 'n';
121	++str;	178	++str;
122	}	179	}
123	else	180	else
124	{	181	{
125	STRLEN clen;	182	switch (ch)
126	UV uch;
127
128	if (is_utf8)
129	{
130	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);
131	if (clen == (STRLEN)-1)
132	croak ("malformed UTF-8 character in string, cannot convert to JSON");
133	}	183	{
134	else	184	case '\010': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
135	{	185	case '\011': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
136	uch = ch;	186	case '\012': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
137	clen = 1;	187	case '\014': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
138	}	188	case '\015': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
139		189
140	if (uch < 0x80 || enc->flags & F_ASCII)	190	default:
141	{
142	if (uch > 0xFFFFUL)
143	{	191	{
		192	STRLEN clen;
		193	UV uch;
		194
		195	if (is_utf8)
		196	{
		197	uch = decode_utf8 (str, end - str, &clen);
		198	if (clen == (STRLEN)-1)
		199	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
		200	}
		201	else
		202	{
		203	uch = ch;
		204	clen = 1;
		205	}
		206
		207	if (uch > 0x10FFFFUL)
		208	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		209
		210	if (uch < 0x80 || enc->json.flags & F_ASCII || (enc->json.flags & F_LATIN1 && uch > 0xFF))
		211	{
		212	if (uch > 0xFFFFUL)
		213	{
144	need (enc, len += 11);	214	need (enc, len += 11);
145	sprintf (enc->cur, "\\u%04x\\u%04x",	215	sprintf (enc->cur, "\\u%04x\\u%04x",
146	(uch - 0x10000) / 0x400 + 0xD800,	216	(int)((uch - 0x10000) / 0x400 + 0xD800),
147	(uch - 0x10000) % 0x400 + 0xDC00);	217	(int)((uch - 0x10000) % 0x400 + 0xDC00));
148	enc->cur += 12;	218	enc->cur += 12;
		219	}
		220	else
		221	{
		222	static char hexdigit [16] = "0123456789abcdef";
		223	need (enc, len += 5);
		224	*enc->cur++ = '\\';
		225	*enc->cur++ = 'u';
		226	*enc->cur++ = hexdigit [ uch >> 12 ];
		227	*enc->cur++ = hexdigit [(uch >> 8) & 15];
		228	*enc->cur++ = hexdigit [(uch >> 4) & 15];
		229	*enc->cur++ = hexdigit [(uch >> 0) & 15];
		230	}
		231
		232	str += clen;
		233	}
		234	else if (enc->json.flags & F_LATIN1)
		235	{
		236	*enc->cur++ = uch;
		237	str += clen;
		238	}
		239	else if (is_utf8)
		240	{
		241	need (enc, len += clen);
		242	do
		243	{
		244	*enc->cur++ = *str++;
		245	}
		246	while (--clen);
		247	}
		248	else
		249	{
		250	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
		251	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
		252	++str;
		253	}
149	}	254	}
150	else
151	{
152	static char hexdigit [16] = "0123456789abcdef";
153	need (enc, len += 5);
154	*enc->cur++ = '\\';
155	*enc->cur++ = 'u';
156	*enc->cur++ = hexdigit [ uch >> 12 ];
157	*enc->cur++ = hexdigit [(uch >> 8) & 15];
158	*enc->cur++ = hexdigit [(uch >> 4) & 15];
159	*enc->cur++ = hexdigit [(uch >> 0) & 15];
160	}
161
162	str += clen;
163	}
164	else if (is_utf8)
165	{
166	need (enc, len += clen);
167	do
168	{
169	*enc->cur++ = *str++;
170	}
171	while (--clen);
172	}
173	else
174	{
175	need (enc, 10); // never more than 11 bytes needed
176	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
177	++str;
178	}	255	}
179	}	256	}
180		257
181	--len;	258	--len;
182	}	259	}
183	}	260	}
184		261
185	#define INDENT SB \	262	inline void
		263	encode_indent (enc_t *enc)
		264	{
186	if (enc->flags & F_INDENT) \	265	if (enc->json.flags & F_INDENT)
187	{ \	266	{
188	int i_; \	267	int spaces = enc->indent * INDENT_STEP;
189	need (enc, enc->indent); \	268
190	for (i_ = enc->indent * 3; i_--; )\	269	need (enc, spaces);
		270	memset (enc->cur, ' ', spaces);
		271	enc->cur += spaces;
		272	}
		273	}
		274
		275	inline void
		276	encode_space (enc_t *enc)
		277	{
		278	need (enc, 1);
		279	encode_ch (enc, ' ');
		280	}
		281
		282	inline void
		283	encode_nl (enc_t *enc)
		284	{
		285	if (enc->json.flags & F_INDENT)
		286	{
		287	need (enc, 1);
191	encode_ch (enc, ' '); \	288	encode_ch (enc, '\n');
192	} \	289	}
193	SE	290	}
194		291
195	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	292	inline void
196	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	293	encode_comma (enc_t *enc)
197	#define COMMA SB \	294	{
198	encode_ch (enc, ','); \	295	encode_ch (enc, ',');
		296
199	if (enc->flags & F_INDENT) \	297	if (enc->json.flags & F_INDENT)
200	NL; \	298	encode_nl (enc);
201	else if (enc->flags & F_SPACE_AFTER) \	299	else if (enc->json.flags & F_SPACE_AFTER)
202	SPACE; \	300	encode_space (enc);
203	SE	301	}
204		302
205	static void encode_sv (enc_t *enc, SV *sv);	303	static void encode_sv (enc_t *enc, SV *sv);
206		304
207	static void	305	static void
208	encode_av (enc_t *enc, AV *av)	306	encode_av (enc_t *enc, AV *av)
209	{	307	{
210	int i, len = av_len (av);	308	int i, len = av_len (av);
211		309
212	encode_ch (enc, '['); NL;	310	if (enc->indent >= enc->maxdepth)
		311	croak ("data structure too deep (hit recursion limit)");
		312
		313	encode_ch (enc, '['); encode_nl (enc);
213	++enc->indent;	314	++enc->indent;
214		315
215	for (i = 0; i <= len; ++i)	316	for (i = 0; i <= len; ++i)
216	{	317	{
217	INDENT;	318	SV **svp = av_fetch (av, i, 0);
218	encode_sv (enc, *av_fetch (av, i, 0));	319
		320	encode_indent (enc);
		321
		322	if (svp)
		323	encode_sv (enc, *svp);
		324	else
		325	encode_str (enc, "null", 4, 0);
219		326
220	if (i < len)	327	if (i < len)
221	COMMA;	328	encode_comma (enc);
222	}	329	}
223		330
224	NL;	331	encode_nl (enc);
225		332
226	--enc->indent;	333	--enc->indent;
227	INDENT; encode_ch (enc, ']');	334	encode_indent (enc); encode_ch (enc, ']');
228	}	335	}
229		336
230	static void	337	static void
231	encode_he (enc_t *enc, HE *he)	338	encode_he (enc_t *enc, HE *he)
232	{	339	{
…		…
246	else	353	else
247	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	354	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
248		355
249	encode_ch (enc, '"');	356	encode_ch (enc, '"');
250		357
251	if (enc->flags & F_SPACE_BEFORE) SPACE;	358	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
252	encode_ch (enc, ':');	359	encode_ch (enc, ':');
253	if (enc->flags & F_SPACE_AFTER ) SPACE;	360	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
254	encode_sv (enc, HeVAL (he));	361	encode_sv (enc, HeVAL (he));
255	}	362	}
256		363
257	// compare hash entries, used when all keys are bytestrings	364	// compare hash entries, used when all keys are bytestrings
258	static int	365	static int
…		…
264	HE *b = *(HE **)b_;	371	HE *b = *(HE **)b_;
265		372
266	STRLEN la = HeKLEN (a);	373	STRLEN la = HeKLEN (a);
267	STRLEN lb = HeKLEN (b);	374	STRLEN lb = HeKLEN (b);
268		375
269	if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	376	if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))
270	cmp = la < lb ? -1 : la == lb ? 0 : 1;	377	cmp = la - lb;
271		378
272	return cmp;	379	return cmp;
273	}	380	}
274		381
275	// compare hash entries, used when some keys are sv's or utf-x	382	// compare hash entries, used when some keys are sv's or utf-x
…		…
282	static void	389	static void
283	encode_hv (enc_t *enc, HV *hv)	390	encode_hv (enc_t *enc, HV *hv)
284	{	391	{
285	int count, i;	392	int count, i;
286		393
		394	if (enc->indent >= enc->maxdepth)
		395	croak ("data structure too deep (hit recursion limit)");
		396
287	encode_ch (enc, '{'); NL; ++enc->indent;	397	encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
288		398
289	if ((count = hv_iterinit (hv)))	399	if ((count = hv_iterinit (hv)))
290	{	400	{
291	// for canonical output we have to sort by keys first	401	// for canonical output we have to sort by keys first
292	// actually, this is mostly due to the stupid so-called	402	// actually, this is mostly due to the stupid so-called
293	// security workaround added somewhere in 5.8.x.	403	// security workaround added somewhere in 5.8.x.
294	// that randomises hash orderings	404	// that randomises hash orderings
295	if (enc->flags & F_CANONICAL)	405	if (enc->json.flags & F_CANONICAL)
296	{	406	{
297	HE *he, *hes [count];
298	int fast = 1;	407	int fast = 1;
		408	HE *he;
		409	#if defined(__BORLANDC__) || defined(_MSC_VER)
		410	HE **hes = _alloca (count * sizeof (HE));
		411	#else
		412	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
		413	#endif
299		414
300	i = 0;	415	i = 0;
301	while ((he = hv_iternext (hv)))	416	while ((he = hv_iternext (hv)))
302	{	417	{
303	hes [i++] = he;	418	hes [i++] = he;
…		…
309		424
310	if (fast)	425	if (fast)
311	qsort (hes, count, sizeof (HE *), he_cmp_fast);	426	qsort (hes, count, sizeof (HE *), he_cmp_fast);
312	else	427	else
313	{	428	{
314	// hack to disable "use bytes"	429	// hack to forcefully disable "use bytes"
315	COP *oldcop = PL_curcop, cop;	430	COP cop = *PL_curcop;
316	cop.op_private = 0;	431	cop.op_private = 0;
		432
		433	ENTER;
		434	SAVETMPS;
		435
		436	SAVEVPTR (PL_curcop);
317	PL_curcop = &cop;	437	PL_curcop = &cop;
318		438
319	SAVETMPS;
320	qsort (hes, count, sizeof (HE *), he_cmp_slow);	439	qsort (hes, count, sizeof (HE *), he_cmp_slow);
		440
321	FREETMPS;	441	FREETMPS;
322		442	LEAVE;
323	PL_curcop = oldcop;
324	}	443	}
325		444
326	for (i = 0; i < count; ++i)	445	for (i = 0; i < count; ++i)
327	{	446	{
328	INDENT;	447	encode_indent (enc);
329	encode_he (enc, hes [i]);	448	encode_he (enc, hes [i]);
330		449
331	if (i < count - 1)	450	if (i < count - 1)
332	COMMA;	451	encode_comma (enc);
333	}
334
335	NL;	452	}
		453
		454	encode_nl (enc);
336	}	455	}
337	else	456	else
338	{	457	{
339	SV *sv;
340	HE *he = hv_iternext (hv);	458	HE *he = hv_iternext (hv);
341		459
342	for (;;)	460	for (;;)
343	{	461	{
344	INDENT;	462	encode_indent (enc);
345	encode_he (enc, he);	463	encode_he (enc, he);
346		464
347	if (!(he = hv_iternext (hv)))	465	if (!(he = hv_iternext (hv)))
348	break;	466	break;
349		467
350	COMMA;	468	encode_comma (enc);
351	}
352
353	NL;	469	}
		470
		471	encode_nl (enc);
354	}	472	}
355	}	473	}
356		474
357	--enc->indent; INDENT; encode_ch (enc, '}');	475	--enc->indent; encode_indent (enc); encode_ch (enc, '}');
		476	}
		477
		478	// encode objects, arrays and special \0=false and \1=true values.
		479	static void
		480	encode_rv (enc_t *enc, SV *sv)
		481	{
		482	svtype svt;
		483
		484	SvGETMAGIC (sv);
		485	svt = SvTYPE (sv);
		486
		487	if (expect_false (SvOBJECT (sv)))
		488	{
		489	HV *stash = !JSON_SLOW || json_boolean_stash
		490	? json_boolean_stash
		491	: gv_stashpv ("JSON::XS::Boolean", 1);
		492
		493	if (SvSTASH (sv) == stash)
		494	{
		495	if (SvIV (sv))
		496	encode_str (enc, "true", 4, 0);
		497	else
		498	encode_str (enc, "false", 5, 0);
		499	}
		500	else
		501	{
		502	#if 0
		503	if (0 && sv_derived_from (rv, "JSON::Literal"))
		504	{
		505	// not yet
		506	}
		507	#endif
		508	if (enc->json.flags & F_CONV_BLESSED)
		509	{
		510	// we re-bless the reference to get overload and other niceties right
		511	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
		512
		513	if (to_json)
		514	{
		515	dSP;
		516
		517	ENTER; SAVETMPS; PUSHMARK (SP);
		518	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		519
		520	// calling with G_SCALAR ensures that we always get a 1 return value
		521	PUTBACK;
		522	call_sv ((SV *)GvCV (to_json), G_SCALAR);
		523	SPAGAIN;
		524
		525	// catch this surprisingly common error
		526	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		527	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		528
		529	sv = POPs;
		530	PUTBACK;
		531
		532	encode_sv (enc, sv);
		533
		534	FREETMPS; LEAVE;
		535	}
		536	else if (enc->json.flags & F_ALLOW_BLESSED)
		537	encode_str (enc, "null", 4, 0);
		538	else
		539	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		540	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		541	}
		542	else if (enc->json.flags & F_ALLOW_BLESSED)
		543	encode_str (enc, "null", 4, 0);
		544	else
		545	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		546	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		547	}
		548	}
		549	else if (svt == SVt_PVHV)
		550	encode_hv (enc, (HV *)sv);
		551	else if (svt == SVt_PVAV)
		552	encode_av (enc, (AV *)sv);
		553	else if (svt < SVt_PVAV)
		554	{
		555	STRLEN len = 0;
		556	char *pv = svt ? SvPV (sv, len) : 0;
		557
		558	if (len == 1 && *pv == '1')
		559	encode_str (enc, "true", 4, 0);
		560	else if (len == 1 && *pv == '0')
		561	encode_str (enc, "false", 5, 0);
		562	else
		563	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		564	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		565	}
		566	else
		567	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		568	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
358	}	569	}
359		570
360	static void	571	static void
361	encode_sv (enc_t *enc, SV *sv)	572	encode_sv (enc_t *enc, SV *sv)
362	{	573	{
…		…
370	encode_str (enc, str, len, SvUTF8 (sv));	581	encode_str (enc, str, len, SvUTF8 (sv));
371	encode_ch (enc, '"');	582	encode_ch (enc, '"');
372	}	583	}
373	else if (SvNOKp (sv))	584	else if (SvNOKp (sv))
374	{	585	{
		586	// trust that perl will do the right thing w.r.t. JSON syntax.
375	need (enc, NV_DIG + 32);	587	need (enc, NV_DIG + 32);
376	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	588	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
377	enc->cur += strlen (enc->cur);	589	enc->cur += strlen (enc->cur);
378	}	590	}
379	else if (SvIOKp (sv))	591	else if (SvIOKp (sv))
380	{	592	{
381	need (enc, 64);	593	// we assume we can always read an IV as a UV
		594	if (SvUV (sv) & ~(UV)0x7fff)
		595	{
		596	// large integer, use the (rather slow) snprintf way.
		597	need (enc, sizeof (UV) * 3);
382	enc->cur +=	598	enc->cur +=
383	SvIsUV(sv)	599	SvIsUV(sv)
384	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	600	? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
385	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	601	: snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
		602	}
		603	else
		604	{
		605	// optimise the "small number case"
		606	// code will likely be branchless and use only a single multiplication
		607	I32 i = SvIV (sv);
		608	U32 u;
		609	char digit, nz = 0;
		610
		611	need (enc, 6);
		612
		613	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		614	u = i < 0 ? -i : i;
		615
		616	// convert to 4.28 fixed-point representation
		617	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		618
		619	// now output digit by digit, each time masking out the integer part
		620	// and multiplying by 5 while moving the decimal point one to the right,
		621	// resulting in a net multiplication by 10.
		622	// we always write the digit to memory but conditionally increment
		623	// the pointer, to ease the usage of conditional move instructions.
		624	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
		625	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
		626	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
		627	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
		628	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		629	}
386	}	630	}
387	else if (SvROK (sv))	631	else if (SvROK (sv))
388	{	632	encode_rv (enc, SvRV (sv));
389	if (!--enc->max_recurse)
390	croak ("data structure too deep (hit recursion limit)");
391
392	sv = SvRV (sv);
393
394	switch (SvTYPE (sv))
395	{
396	case SVt_PVAV: encode_av (enc, (AV *)sv); break;
397	case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
398
399	default:
400	croak ("JSON can only represent references to arrays or hashes");
401	}
402	}
403	else if (!SvOK (sv))	633	else if (!SvOK (sv))
404	encode_str (enc, "null", 4, 0);	634	encode_str (enc, "null", 4, 0);
405	else	635	else
406	croak ("encountered perl type that JSON cannot handle");	636	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
		637	SvPV_nolen (sv), SvFLAGS (sv));
407	}	638	}
408		639
409	static SV *	640	static SV *
410	encode_json (SV *scalar, UV flags)	641	encode_json (SV *scalar, JSON *json)
411	{	642	{
412	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))
413	croak ("hash- or arraref required (not a simple scalar, use allow_nonref to allow this)");
414
415	enc_t enc;	643	enc_t enc;
416	enc.flags = flags;	644
		645	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
		646	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
		647
		648	enc.json = *json;
417	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	649	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
418	enc.cur = SvPVX (enc.sv);	650	enc.cur = SvPVX (enc.sv);
419	enc.end = SvEND (enc.sv);	651	enc.end = SvEND (enc.sv);
420	enc.max_recurse = 0;
421	enc.indent = 0;	652	enc.indent = 0;
		653	enc.maxdepth = DEC_DEPTH (enc.json.flags);
422		654
423	SvPOK_only (enc.sv);	655	SvPOK_only (enc.sv);
424	encode_sv (&enc, scalar);	656	encode_sv (&enc, scalar);
425		657
		658	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		659	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		660
426	if (!(flags & (F_ASCII | F_UTF8)))	661	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
427	SvUTF8_on (enc.sv);	662	SvUTF8_on (enc.sv);
428		663
429	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));	664	if (enc.json.flags & F_SHRINK)
		665	shrink (enc.sv);
		666
430	return enc.sv;	667	return enc.sv;
431	}	668	}
432		669
433	/////////////////////////////////////////////////////////////////////////////	670	/////////////////////////////////////////////////////////////////////////////
		671	// decoder
434		672
435	#define WS \	673	// structure used for decoding JSON
		674	typedef struct
		675	{
		676	char *cur; // current parser pointer
		677	char *end; // end of input string
		678	const char *err; // parse error, if != 0
		679	JSON json;
		680	U32 depth; // recursion depth
		681	U32 maxdepth; // recursion depth limit
		682	} dec_t;
		683
		684	inline void
		685	decode_ws (dec_t *dec)
		686	{
436	for (;;) \	687	for (;;)
437	{ \	688	{
438	char ch = *dec->cur; \	689	char ch = *dec->cur;
		690
439	if (ch > 0x20 \	691	if (ch > 0x20
440	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	692	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
441	break; \	693	break;
		694
442	++dec->cur; \	695	++dec->cur;
443	}	696	}
		697	}
444		698
445	#define ERR(reason) SB dec->err = reason; goto fail; SE	699	#define ERR(reason) SB dec->err = reason; goto fail; SE
		700
446	#define EXPECT_CH(ch) SB \	701	#define EXPECT_CH(ch) SB \
447	if (*dec->cur != ch) \	702	if (*dec->cur != ch) \
448	ERR (# ch " expected"); \	703	ERR (# ch " expected"); \
449	++dec->cur; \	704	++dec->cur; \
450	SE	705	SE
451		706
		707	#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
		708	#define DEC_DEC_DEPTH --dec->depth
		709
452	static SV *decode_sv (dec_t *dec);	710	static SV *decode_sv (dec_t *dec);
453		711
454	static signed char decode_hexdigit[256];	712	static signed char decode_hexdigit[256];
455		713
456	static UV	714	static UV
457	decode_4hex (dec_t *dec)	715	decode_4hex (dec_t *dec)
458	{	716	{
459	signed char d1, d2, d3, d4;	717	signed char d1, d2, d3, d4;
		718	unsigned char *cur = (unsigned char *)dec->cur;
460		719
461	d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]];	720	d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
462	if (d1 < 0) ERR ("four hexadecimal digits expected");	721	d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
463	d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]];	722	d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
464	if (d2 < 0) ERR ("four hexadecimal digits expected");	723	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
465	d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
466	if (d3 < 0) ERR ("four hexadecimal digits expected");
467	d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
468	if (d4 < 0) ERR ("four hexadecimal digits expected");
469		724
470	dec->cur += 4;	725	dec->cur += 4;
471		726
472	return ((UV)d1) << 12	727	return ((UV)d1) << 12
473	| ((UV)d2) << 8	728	| ((UV)d2) << 8
…		…
476		731
477	fail:	732	fail:
478	return (UV)-1;	733	return (UV)-1;
479	}	734	}
480		735
481	#define APPEND_GROW(n) SB \
482	if (cur + (n) >= end) \
483	{ \
484	STRLEN ofs = cur - SvPVX (sv); \
485	SvGROW (sv, ofs + (n) + 1); \
486	cur = SvPVX (sv) + ofs; \
487	end = SvEND (sv); \
488	} \
489	SE
490
491	#define APPEND_CH(ch) SB \
492	APPEND_GROW (1); \
493	*cur++ = (ch); \
494	SE
495
496	static SV *	736	static SV *
497	decode_str (dec_t *dec)	737	decode_str (dec_t *dec)
498	{	738	{
499	SV *sv = NEWSV (0,2);	739	SV *sv = 0;
500	int utf8 = 0;	740	int utf8 = 0;
501	char *cur = SvPVX (sv);	741	char *dec_cur = dec->cur;
502	char *end = SvEND (sv);
503		742
504	for (;;)	743	do
505	{	744	{
506	unsigned char ch = *(unsigned char *)dec->cur;	745	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		746	char *cur = buf;
507		747
508	if (ch == '"')	748	do
509	break;
510	else if (ch == '\\')
511	{	749	{
512	switch (*++dec->cur)	750	unsigned char ch = *(unsigned char *)dec_cur++;
		751
		752	if (expect_false (ch == '"'))
		753	{
		754	--dec_cur;
		755	break;
513	{	756	}
514	case '\\':	757	else if (expect_false (ch == '\\'))
515	case '/':	758	{
516	case '"': APPEND_CH (*dec->cur++); break;	759	switch (*dec_cur)
517
518	case 'b': APPEND_CH ('\010'); ++dec->cur; break;
519	case 't': APPEND_CH ('\011'); ++dec->cur; break;
520	case 'n': APPEND_CH ('\012'); ++dec->cur; break;
521	case 'f': APPEND_CH ('\014'); ++dec->cur; break;
522	case 'r': APPEND_CH ('\015'); ++dec->cur; break;
523
524	case 'u':
525	{	760	{
526	UV lo, hi;	761	case '\\':
527	++dec->cur;	762	case '/':
		763	case '"': *cur++ = *dec_cur++; break;
528		764
529	hi = decode_4hex (dec);	765	case 'b': ++dec_cur; *cur++ = '\010'; break;
530	if (hi == (UV)-1)	766	case 't': ++dec_cur; *cur++ = '\011'; break;
531	goto fail;	767	case 'n': ++dec_cur; *cur++ = '\012'; break;
		768	case 'f': ++dec_cur; *cur++ = '\014'; break;
		769	case 'r': ++dec_cur; *cur++ = '\015'; break;
532		770
533	// possibly a surrogate pair	771	case 'u':
534	if (hi >= 0xd800 && hi < 0xdc00)
535	{	772	{
536	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	773	UV lo, hi;
537	ERR ("missing low surrogate character in surrogate pair");	774	++dec_cur;
538		775
539	dec->cur += 2;	776	dec->cur = dec_cur;
540
541	lo = decode_4hex (dec);	777	hi = decode_4hex (dec);
		778	dec_cur = dec->cur;
542	if (lo == (UV)-1)	779	if (hi == (UV)-1)
543	goto fail;	780	goto fail;
544		781
		782	// possibly a surrogate pair
		783	if (hi >= 0xd800)
		784	if (hi < 0xdc00)
		785	{
		786	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
		787	ERR ("missing low surrogate character in surrogate pair");
		788
		789	dec_cur += 2;
		790
		791	dec->cur = dec_cur;
		792	lo = decode_4hex (dec);
		793	dec_cur = dec->cur;
		794	if (lo == (UV)-1)
		795	goto fail;
		796
545	if (lo < 0xdc00 || lo >= 0xe000)	797	if (lo < 0xdc00 || lo >= 0xe000)
546	ERR ("surrogate pair expected");	798	ERR ("surrogate pair expected");
547		799
548	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;	800	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
		801	}
		802	else if (hi < 0xe000)
		803	ERR ("missing high surrogate character in surrogate pair");
		804
		805	if (hi >= 0x80)
		806	{
		807	utf8 = 1;
		808
		809	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
		810	}
		811	else
		812	*cur++ = hi;
549	}	813	}
550	else if (hi >= 0xdc00 && hi < 0xe000)
551	ERR ("missing high surrogate character in surrogate pair");
552
553	if (hi >= 0x80)
554	{	814	break;
555	utf8 = 1;
556		815
557	APPEND_GROW (4); // at most 4 bytes for 21 bits
558	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
559	}
560	else	816	default:
561	APPEND_CH (hi);	817	--dec_cur;
		818	ERR ("illegal backslash escape sequence in string");
562	}	819	}
563	break;	820	}
		821	else if (expect_true (ch >= 0x20 && ch <= 0x7f))
		822	*cur++ = ch;
		823	else if (ch >= 0x80)
		824	{
		825	STRLEN clen;
		826	UV uch;
564		827
565	default:
566	--dec->cur;	828	--dec_cur;
567	ERR ("illegal backslash escape sequence in string");	829
		830	uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		831	if (clen == (STRLEN)-1)
		832	ERR ("malformed UTF-8 character in JSON string");
		833
		834	do
		835	*cur++ = *dec_cur++;
		836	while (--clen);
		837
		838	utf8 = 1;
		839	}
		840	else
		841	{
		842	--dec_cur;
		843
		844	if (!ch)
		845	ERR ("unexpected end of string while parsing JSON string");
		846	else
		847	ERR ("invalid character encountered while parsing JSON string");
568	}	848	}
569	}	849	}
570	else if (ch >= 0x20 && ch <= 0x7f)	850	while (cur < buf + SHORT_STRING_LEN);
571	APPEND_CH (*dec->cur++);	851
572	else if (ch >= 0x80)
573	{	852	{
574	STRLEN clen;	853	STRLEN len = cur - buf;
575	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
576	if (clen == (STRLEN)-1)
577	ERR ("malformed UTF-8 character in string, cannot convert to JSON");
578		854
579	APPEND_GROW (clen);	855	if (sv)
580	do
581	{	856	{
582	*cur++ = *dec->cur++;	857	SvGROW (sv, SvCUR (sv) + len + 1);
		858	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
		859	SvCUR_set (sv, SvCUR (sv) + len);
583	}	860	}
584	while (--clen);
585
586	utf8 = 1;
587	}
588	else if (dec->cur == dec->end)
589	ERR ("unexpected end of string while parsing json string");
590	else	861	else
591	ERR ("invalid character encountered");	862	sv = newSVpvn (buf, len);
592	}	863	}
		864	}
		865	while (*dec_cur != '"');
593		866
594	++dec->cur;	867	++dec_cur;
595		868
596	SvCUR_set (sv, cur - SvPVX (sv));	869	if (sv)
597		870	{
598	SvPOK_only (sv);	871	SvPOK_only (sv);
599	*SvEND (sv) = 0;	872	*SvEND (sv) = 0;
600		873
601	if (utf8)	874	if (utf8)
602	SvUTF8_on (sv);	875	SvUTF8_on (sv);
		876	}
		877	else
		878	sv = newSVpvn ("", 0);
603		879
		880	dec->cur = dec_cur;
604	return sv;	881	return sv;
605		882
606	fail:	883	fail:
607	SvREFCNT_dec (sv);	884	dec->cur = dec_cur;
608	return 0;	885	return 0;
609	}	886	}
610		887
611	static SV *	888	static SV *
612	decode_num (dec_t *dec)	889	decode_num (dec_t *dec)
…		…
670	is_nv = 1;	947	is_nv = 1;
671	}	948	}
672		949
673	if (!is_nv)	950	if (!is_nv)
674	{	951	{
675	UV uv;	952	int len = dec->cur - start;
676	int numtype = grok_number (start, dec->cur - start, &uv);	953
677	if (numtype & IS_NUMBER_IN_UV)	954	// special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
678	if (numtype & IS_NUMBER_NEG)	955	if (*start == '-')
		956	switch (len)
679	{	957	{
680	if (uv < (UV)IV_MIN)	958	case 2: return newSViv (-( start [1] - '0' * 1));
681	return newSViv (-(IV)uv);	959	case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
		960	case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		961	case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
682	}	962	}
		963	else
		964	switch (len)
		965	{
		966	case 1: return newSViv ( start [0] - '0' * 1);
		967	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		968	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		969	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		970	}
		971
		972	{
		973	UV uv;
		974	int numtype = grok_number (start, len, &uv);
		975	if (numtype & IS_NUMBER_IN_UV)
		976	if (numtype & IS_NUMBER_NEG)
		977	{
		978	if (uv < (UV)IV_MIN)
		979	return newSViv (-(IV)uv);
		980	}
683	else	981	else
684	return newSVuv (uv);	982	return newSVuv (uv);
685	}	983	}
686		984
		985	len -= *start == '-' ? 1 : 0;
		986
		987	// does not fit into IV or UV, try NV
		988	if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len)
		989	#if defined (LDBL_DIG)
		990	|| (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len)
		991	#endif
		992	)
		993	// fits into NV without loss of precision
		994	return newSVnv (Atof (start));
		995
		996	// everything else fails, convert it to a string
		997	return newSVpvn (start, dec->cur - start);
		998	}
		999
		1000	// loss of precision here
687	return newSVnv (Atof (start));	1001	return newSVnv (Atof (start));
688		1002
689	fail:	1003	fail:
690	return 0;	1004	return 0;
691	}	1005	}
…		…
693	static SV *	1007	static SV *
694	decode_av (dec_t *dec)	1008	decode_av (dec_t *dec)
695	{	1009	{
696	AV *av = newAV ();	1010	AV *av = newAV ();
697		1011
698	WS;	1012	DEC_INC_DEPTH;
		1013	decode_ws (dec);
		1014
699	if (*dec->cur == ']')	1015	if (*dec->cur == ']')
700	++dec->cur;	1016	++dec->cur;
701	else	1017	else
702	for (;;)	1018	for (;;)
703	{	1019	{
…		…
707	if (!value)	1023	if (!value)
708	goto fail;	1024	goto fail;
709		1025
710	av_push (av, value);	1026	av_push (av, value);
711		1027
712	WS;	1028	decode_ws (dec);
713		1029
714	if (*dec->cur == ']')	1030	if (*dec->cur == ']')
715	{	1031	{
716	++dec->cur;	1032	++dec->cur;
717	break;	1033	break;
…		…
721	ERR (", or ] expected while parsing array");	1037	ERR (", or ] expected while parsing array");
722		1038
723	++dec->cur;	1039	++dec->cur;
724	}	1040	}
725		1041
		1042	DEC_DEC_DEPTH;
726	return newRV_noinc ((SV *)av);	1043	return newRV_noinc ((SV *)av);
727		1044
728	fail:	1045	fail:
729	SvREFCNT_dec (av);	1046	SvREFCNT_dec (av);
		1047	DEC_DEC_DEPTH;
730	return 0;	1048	return 0;
731	}	1049	}
732		1050
733	static SV *	1051	static SV *
734	decode_hv (dec_t *dec)	1052	decode_hv (dec_t *dec)
735	{	1053	{
		1054	SV *sv;
736	HV *hv = newHV ();	1055	HV *hv = newHV ();
737		1056
738	WS;	1057	DEC_INC_DEPTH;
		1058	decode_ws (dec);
		1059
739	if (*dec->cur == '}')	1060	if (*dec->cur == '}')
740	++dec->cur;	1061	++dec->cur;
741	else	1062	else
742	for (;;)	1063	for (;;)
743	{	1064	{
		1065	decode_ws (dec); EXPECT_CH ('"');
		1066
		1067	// heuristic: assume that
		1068	// a) decode_str + hv_store_ent are abysmally slow.
		1069	// b) most hash keys are short, simple ascii text.
		1070	// => try to "fast-match" such strings to avoid
		1071	// the overhead of decode_str + hv_store_ent.
		1072	{
744	SV *key, *value;	1073	SV *value;
		1074	char *p = dec->cur;
		1075	char *e = p + 24; // only try up to 24 bytes
745		1076
746	WS; EXPECT_CH ('"');	1077	for (;;)
747
748	key = decode_str (dec);
749	if (!key)
750	goto fail;
751
752	WS; EXPECT_CH (':');
753
754	value = decode_sv (dec);
755	if (!value)
756	{	1078	{
		1079	// the >= 0x80 is true on most architectures
		1080	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1081	{
		1082	// slow path, back up and use decode_str
		1083	SV *key = decode_str (dec);
		1084	if (!key)
		1085	goto fail;
		1086
		1087	decode_ws (dec); EXPECT_CH (':');
		1088
		1089	value = decode_sv (dec);
		1090	if (!value)
		1091	{
		1092	SvREFCNT_dec (key);
		1093	goto fail;
		1094	}
		1095
		1096	hv_store_ent (hv, key, value, 0);
757	SvREFCNT_dec (key);	1097	SvREFCNT_dec (key);
		1098
		1099	break;
		1100	}
		1101	else if (*p == '"')
		1102	{
		1103	// fast path, got a simple key
		1104	char *key = dec->cur;
		1105	int len = p - key;
		1106	dec->cur = p + 1;
		1107
		1108	decode_ws (dec); EXPECT_CH (':');
		1109
		1110	value = decode_sv (dec);
		1111	if (!value)
758	goto fail;	1112	goto fail;
		1113
		1114	hv_store (hv, key, len, value, 0);
		1115
		1116	break;
		1117	}
		1118
		1119	++p;
759	}	1120	}
760
761	//TODO: optimise
762	hv_store_ent (hv, key, value, 0);
763
764	WS;	1121	}
		1122
		1123	decode_ws (dec);
765		1124
766	if (*dec->cur == '}')	1125	if (*dec->cur == '}')
767	{	1126	{
768	++dec->cur;	1127	++dec->cur;
769	break;	1128	break;
…		…
773	ERR (", or } expected while parsing object/hash");	1132	ERR (", or } expected while parsing object/hash");
774		1133
775	++dec->cur;	1134	++dec->cur;
776	}	1135	}
777		1136
		1137	DEC_DEC_DEPTH;
778	return newRV_noinc ((SV *)hv);	1138	sv = newRV_noinc ((SV *)hv);
		1139
		1140	// check filter callbacks
		1141	if (dec->json.flags & F_HOOK)
		1142	{
		1143	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1144	{
		1145	HE *cb, *he;
		1146
		1147	hv_iterinit (hv);
		1148	he = hv_iternext (hv);
		1149	hv_iterinit (hv);
		1150
		1151	// the next line creates a mortal sv each time its called.
		1152	// might want to optimise this for common cases.
		1153	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1154
		1155	if (cb)
		1156	{
		1157	dSP;
		1158	int count;
		1159
		1160	ENTER; SAVETMPS; PUSHMARK (SP);
		1161	XPUSHs (HeVAL (he));
		1162
		1163	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1164
		1165	if (count == 1)
		1166	{
		1167	sv = newSVsv (POPs);
		1168	FREETMPS; LEAVE;
		1169	return sv;
		1170	}
		1171
		1172	FREETMPS; LEAVE;
		1173	}
		1174	}
		1175
		1176	if (dec->json.cb_object)
		1177	{
		1178	dSP;
		1179	int count;
		1180
		1181	ENTER; SAVETMPS; PUSHMARK (SP);
		1182	XPUSHs (sv_2mortal (sv));
		1183
		1184	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1185
		1186	if (count == 1)
		1187	{
		1188	sv = newSVsv (POPs);
		1189	FREETMPS; LEAVE;
		1190	return sv;
		1191	}
		1192
		1193	SvREFCNT_inc (sv);
		1194	FREETMPS; LEAVE;
		1195	}
		1196	}
		1197
		1198	return sv;
779		1199
780	fail:	1200	fail:
781	SvREFCNT_dec (hv);	1201	SvREFCNT_dec (hv);
		1202	DEC_DEC_DEPTH;
782	return 0;	1203	return 0;
783	}	1204	}
784		1205
785	static SV *	1206	static SV *
786	decode_sv (dec_t *dec)	1207	decode_sv (dec_t *dec)
787	{	1208	{
788	WS;	1209	decode_ws (dec);
		1210
		1211	// the beauty of JSON: you need exactly one character lookahead
		1212	// to parse anything.
789	switch (*dec->cur)	1213	switch (*dec->cur)
790	{	1214	{
791	case '"': ++dec->cur; return decode_str (dec);	1215	case '"': ++dec->cur; return decode_str (dec);
792	case '[': ++dec->cur; return decode_av (dec);	1216	case '[': ++dec->cur; return decode_av (dec);
793	case '{': ++dec->cur; return decode_hv (dec);	1217	case '{': ++dec->cur; return decode_hv (dec);
…		…
799		1223
800	case 't':	1224	case 't':
801	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1225	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
802	{	1226	{
803	dec->cur += 4;	1227	dec->cur += 4;
804	return newSViv (1);	1228	return SvREFCNT_inc (json_true);
805	}	1229	}
806	else	1230	else
807	ERR ("'true' expected");	1231	ERR ("'true' expected");
808		1232
809	break;	1233	break;
810		1234
811	case 'f':	1235	case 'f':
812	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1236	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
813	{	1237	{
814	dec->cur += 5;	1238	dec->cur += 5;
815	return newSViv (0);	1239	return SvREFCNT_inc (json_false);
816	}	1240	}
817	else	1241	else
818	ERR ("'false' expected");	1242	ERR ("'false' expected");
819		1243
820	break;	1244	break;
…		…
829	ERR ("'null' expected");	1253	ERR ("'null' expected");
830		1254
831	break;	1255	break;
832		1256
833	default:	1257	default:
834	ERR ("malformed json string");	1258	ERR ("malformed JSON string, neither array, object, number, string or atom");
835	break;	1259	break;
836	}	1260	}
837		1261
838	fail:	1262	fail:
839	return 0;	1263	return 0;
840	}	1264	}
841		1265
842	static SV *	1266	static SV *
843	decode_json (SV *string, UV flags)	1267	decode_json (SV *string, JSON *json, UV *offset_return)
844	{	1268	{
		1269	dec_t dec;
		1270	UV offset;
845	SV *sv;	1271	SV *sv;
846		1272
		1273	SvGETMAGIC (string);
		1274	SvUPGRADE (string, SVt_PV);
		1275
		1276	if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
		1277	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1278	(unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
		1279
847	if (flags & F_UTF8)	1280	if (json->flags & F_UTF8)
848	sv_utf8_downgrade (string, 0);	1281	sv_utf8_downgrade (string, 0);
849	else	1282	else
850	sv_utf8_upgrade (string);	1283	sv_utf8_upgrade (string);
851		1284
852	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1285	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
853		1286
854	dec_t dec;	1287	dec.json = *json;
855	dec.flags = flags;
856	dec.cur = SvPVX (string);	1288	dec.cur = SvPVX (string);
857	dec.end = SvEND (string);	1289	dec.end = SvEND (string);
858	dec.err = 0;	1290	dec.err = 0;
		1291	dec.depth = 0;
		1292	dec.maxdepth = DEC_DEPTH (dec.json.flags);
859		1293
		1294	if (dec.json.cb_object || dec.json.cb_sk_object)
		1295	dec.json.flags |= F_HOOK;
		1296
		1297	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
860	sv = decode_sv (&dec);	1298	sv = decode_sv (&dec);
861		1299
		1300	if (!(offset_return || !sv))
		1301	{
		1302	// check for trailing garbage
		1303	decode_ws (&dec);
		1304
		1305	if (*dec.cur)
		1306	{
		1307	dec.err = "garbage after JSON object";
		1308	SvREFCNT_dec (sv);
		1309	sv = 0;
		1310	}
		1311	}
		1312
		1313	if (offset_return || !sv)
		1314	{
		1315	offset = dec.json.flags & F_UTF8
		1316	? dec.cur - SvPVX (string)
		1317	: utf8_distance (dec.cur, SvPVX (string));
		1318
		1319	if (offset_return)
		1320	*offset_return = offset;
		1321	}
		1322
862	if (!sv)	1323	if (!sv)
863	{	1324	{
864	IV offset = utf8_distance (dec.cur, SvPVX (string));
865	SV *uni = sv_newmortal ();	1325	SV *uni = sv_newmortal ();
		1326
866	// horrible hack to silence warning inside pv_uni_display	1327	// horrible hack to silence warning inside pv_uni_display
867	COP cop;	1328	COP cop = *PL_curcop;
868	memset (&cop, 0, sizeof (cop));
869	cop.cop_warnings = pWARN_NONE;	1329	cop.cop_warnings = pWARN_NONE;
		1330	ENTER;
870	SAVEVPTR (PL_curcop);	1331	SAVEVPTR (PL_curcop);
871	PL_curcop = &cop;	1332	PL_curcop = &cop;
872
873	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1333	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
		1334	LEAVE;
		1335
874	croak ("%s, at character offset %d (%s)",	1336	croak ("%s, at character offset %d [\"%s\"]",
875	dec.err,	1337	dec.err,
876	(int)offset,	1338	(int)offset,
877	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1339	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
878	}	1340	}
879		1341
880	sv = sv_2mortal (sv);	1342	sv = sv_2mortal (sv);
881		1343
882	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1344	if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
883	croak ("JSON object or array expected (but number, string, true, false or null found, use allow_nonref to allow this)");	1345	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
884		1346
885	return sv;	1347	return sv;
886	}	1348	}
887		1349
		1350	/////////////////////////////////////////////////////////////////////////////
		1351	// XS interface functions
		1352
888	MODULE = JSON::XS PACKAGE = JSON::XS	1353	MODULE = JSON::XS PACKAGE = JSON::XS
889		1354
890	BOOT:	1355	BOOT:
891	{	1356	{
892	int i;	1357	int i;
893		1358
894	memset (decode_hexdigit, 0xff, 256);
895	for (i = 10; i--; )	1359	for (i = 0; i < 256; ++i)
896	decode_hexdigit ['0' + i] = i;	1360	decode_hexdigit [i] =
		1361	i >= '0' && i <= '9' ? i - '0'
		1362	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1363	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1364	: -1;
897		1365
898	for (i = 7; i--; )	1366	json_stash = gv_stashpv ("JSON::XS" , 1);
		1367	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1368
		1369	json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
		1370	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1371	}
		1372
		1373	PROTOTYPES: DISABLE
		1374
		1375	void CLONE (...)
		1376	CODE:
		1377	json_stash = 0;
		1378	json_boolean_stash = 0;
		1379
		1380	void new (char *klass)
		1381	PPCODE:
		1382	{
		1383	HV *stash = !JSON_SLOW || json_stash
		1384	? json_stash
		1385	: gv_stashpv ("JSON::XS", 1);
		1386	SV *pv = NEWSV (0, sizeof (JSON));
		1387	SvPOK_only (pv);
		1388	Zero (SvPVX (pv), 1, JSON);
		1389	((JSON *)SvPVX (pv))->flags = F_DEFAULT;
		1390	XPUSHs (sv_2mortal (sv_bless (newRV_noinc (pv), stash)));
		1391	}
		1392
		1393	void ascii (JSON *self, int enable = 1)
		1394	ALIAS:
		1395	ascii = F_ASCII
		1396	latin1 = F_LATIN1
		1397	utf8 = F_UTF8
		1398	indent = F_INDENT
		1399	canonical = F_CANONICAL
		1400	space_before = F_SPACE_BEFORE
		1401	space_after = F_SPACE_AFTER
		1402	pretty = F_PRETTY
		1403	allow_nonref = F_ALLOW_NONREF
		1404	shrink = F_SHRINK
		1405	allow_blessed = F_ALLOW_BLESSED
		1406	convert_blessed = F_CONV_BLESSED
		1407	PPCODE:
		1408	{
		1409	if (enable)
		1410	self->flags |= ix;
		1411	else
		1412	self->flags &= ~ix;
		1413
		1414	XPUSHs (ST (0));
		1415	}
		1416
		1417	void max_depth (JSON *self, UV max_depth = 0x80000000UL)
		1418	PPCODE:
		1419	{
		1420	UV log2 = 0;
		1421
		1422	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
		1423
		1424	while ((1UL << log2) < max_depth)
		1425	++log2;
		1426
		1427	self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
		1428
		1429	XPUSHs (ST (0));
		1430	}
		1431
		1432	void max_size (JSON *self, UV max_size = 0)
		1433	PPCODE:
		1434	{
		1435	UV log2 = 0;
		1436
		1437	if (max_size > 0x80000000UL) max_size = 0x80000000UL;
		1438	if (max_size == 1) max_size = 2;
		1439
		1440	while ((1UL << log2) < max_size)
		1441	++log2;
		1442
		1443	self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
		1444
		1445	XPUSHs (ST (0));
		1446	}
		1447
		1448	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
		1449	PPCODE:
		1450	{
		1451	SvREFCNT_dec (self->cb_object);
		1452	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
		1453
		1454	XPUSHs (ST (0));
		1455	}
		1456
		1457	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
		1458	PPCODE:
		1459	{
		1460	if (!self->cb_sk_object)
		1461	self->cb_sk_object = newHV ();
		1462
		1463	if (SvOK (cb))
		1464	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1465	else
899	{	1466	{
900	decode_hexdigit ['a' + i] = 10 + i;	1467	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
901	decode_hexdigit ['A' + i] = 10 + i;	1468
		1469	if (!HvKEYS (self->cb_sk_object))
		1470	{
		1471	SvREFCNT_dec (self->cb_sk_object);
		1472	self->cb_sk_object = 0;
		1473	}
902	}	1474	}
903		1475
904	json_stash = gv_stashpv ("JSON::XS", 1);	1476	XPUSHs (ST (0));
905	}	1477	}
906		1478
907	PROTOTYPES: DISABLE	1479	void encode (JSON *self, SV *scalar)
		1480	PPCODE:
		1481	XPUSHs (encode_json (scalar, self));
908		1482
909	SV *new (char *dummy)	1483	void decode (JSON *self, SV *jsonstr)
		1484	PPCODE:
		1485	XPUSHs (decode_json (jsonstr, self, 0));
		1486
		1487	void decode_prefix (JSON *self, SV *jsonstr)
		1488	PPCODE:
		1489	{
		1490	UV offset;
		1491	EXTEND (SP, 2);
		1492	PUSHs (decode_json (jsonstr, self, &offset));
		1493	PUSHs (sv_2mortal (newSVuv (offset)));
		1494	}
		1495
		1496	void DESTROY (JSON *self)
910	CODE:	1497	CODE:
911	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1498	SvREFCNT_dec (self->cb_sk_object);
912	OUTPUT:	1499	SvREFCNT_dec (self->cb_object);
913	RETVAL
914
915	SV *ascii (SV *self, int enable)
916	ALIAS:
917	ascii = F_ASCII
918	utf8 = F_UTF8
919	indent = F_INDENT
920	canonical = F_CANONICAL
921	space_before = F_SPACE_BEFORE
922	space_after = F_SPACE_AFTER
923	json_rpc = F_JSON_RPC
924	pretty = F_PRETTY
925	allow_nonref = F_ALLOW_NONREF
926	CODE:
927	{
928	UV *uv = SvJSON (self);
929	if (enable)
930	*uv |= ix;
931	else
932	*uv &= ~ix;
933
934	RETVAL = newSVsv (self);
935	}
936	OUTPUT:
937	RETVAL
938
939	void encode (SV *self, SV *scalar)
940	PPCODE:
941	XPUSHs (encode_json (scalar, *SvJSON (self)));
942
943	void decode (SV *self, SV *jsonstr)
944	PPCODE:
945	XPUSHs (decode_json (jsonstr, *SvJSON (self)));
946		1500
947	PROTOTYPES: ENABLE	1501	PROTOTYPES: ENABLE
948		1502
949	void to_json (SV *scalar)	1503	void to_json (SV *scalar)
950	PPCODE:	1504	PPCODE:
		1505	{
		1506	JSON json = { F_DEFAULT | F_UTF8 };
951	XPUSHs (encode_json (scalar, F_UTF8));	1507	XPUSHs (encode_json (scalar, &json));
		1508	}
952		1509
953	void from_json (SV *jsonstr)	1510	void from_json (SV *jsonstr)
954	PPCODE:	1511	PPCODE:
		1512	{
		1513	JSON json = { F_DEFAULT | F_UTF8 };
955	XPUSHs (decode_json (jsonstr, F_UTF8));	1514	XPUSHs (decode_json (jsonstr, &json, 0));
		1515	}
956		1516

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