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Comparing JSON-XS/XS.xs (file contents):
Revision 1.10 by root, Sat Mar 24 01:15:22 2007 UTC vs.
Revision 1.52 by root, Mon Jul 2 02:57:11 2007 UTC

…		…
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"
8		9
		10	#if defined(__BORLANDC__) || defined(_MSC_VER)
		11	# define snprintf _snprintf // C compilers have this in stdio.h
		12	#endif
		13
		14	// some old perls do not have this, try to make it work, no
		15	// guarentees, though. if it breaks, you get to keep the pieces.
		16	#ifndef UTF8_MAXBYTES
		17	# define UTF8_MAXBYTES 13
		18	#endif
		19
9	#define F_ASCII 0x00000001	20	#define F_ASCII 0x00000001UL
		21	#define F_LATIN1 0x00000002UL
10	#define F_UTF8 0x00000002	22	#define F_UTF8 0x00000004UL
11	#define F_INDENT 0x00000004	23	#define F_INDENT 0x00000008UL
12	#define F_CANONICAL 0x00000008	24	#define F_CANONICAL 0x00000010UL
13	#define F_SPACE_BEFORE 0x00000010	25	#define F_SPACE_BEFORE 0x00000020UL
14	#define F_SPACE_AFTER 0x00000020	26	#define F_SPACE_AFTER 0x00000040UL
15	#define F_ALLOW_NONREF 0x00000080	27	#define F_ALLOW_NONREF 0x00000100UL
16	#define F_SHRINK 0x00000100	28	#define F_SHRINK 0x00000200UL
		29	#define F_ALLOW_BLESSED 0x00000400UL
		30	#define F_CONV_BLESSED 0x00000800UL
		31	#define F_MAXDEPTH 0xf8000000UL
		32	#define S_MAXDEPTH 27
		33	#define F_MAXSIZE 0x01f00000UL
		34	#define S_MAXSIZE 20
		35	#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
		36
		37	#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
		38	#define DEC_SIZE(flags) (1UL << ((flags & F_MAXSIZE ) >> S_MAXSIZE ))
17		39
18	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	40	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
19	#define F_DEFAULT 0	41	#define F_DEFAULT (9UL << S_MAXDEPTH)
20		42
21	#define INIT_SIZE 32 // initial scalar size to be allocated	43	#define INIT_SIZE 32 // initial scalar size to be allocated
		44	#define INDENT_STEP 3 // spaces per indentation level
		45
		46	#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
22		47
23	#define SB do {	48	#define SB do {
24	#define SE } while (0)	49	#define SE } while (0)
25		50
26	static HV *json_stash;	51	#if __GNUC__ >= 3
		52	# define expect(expr,value) __builtin_expect ((expr),(value))
		53	# define inline inline
		54	#else
		55	# define expect(expr,value) (expr)
		56	# define inline static
		57	#endif
		58
		59	#define expect_false(expr) expect ((expr) != 0, 0)
		60	#define expect_true(expr) expect ((expr) != 0, 1)
		61
		62	static HV *json_stash, *json_boolean_stash; // JSON::XS::
		63	static SV *json_true, *json_false;
		64
		65	typedef struct {
		66	U32 flags;
		67	SV *cb_object;
		68	HV *cb_sk_object;
		69	} JSON;
		70
		71	/////////////////////////////////////////////////////////////////////////////
		72	// utility functions
		73
		74	inline void
		75	shrink (SV *sv)
		76	{
		77	sv_utf8_downgrade (sv, 1);
		78	if (SvLEN (sv) > SvCUR (sv) + 1)
		79	{
		80	#ifdef SvPV_shrink_to_cur
		81	SvPV_shrink_to_cur (sv);
		82	#elif defined (SvPV_renew)
		83	SvPV_renew (sv, SvCUR (sv) + 1);
		84	#endif
		85	}
		86	}
		87
		88	// decode an utf-8 character and return it, or (UV)-1 in
		89	// case of an error.
		90	// we special-case "safe" characters from U+80 .. U+7FF,
		91	// but use the very good perl function to parse anything else.
		92	// note that we never call this function for a ascii codepoints
		93	inline UV
		94	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
		95	{
		96	if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
		97	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		98	else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
		99	{
		100	*clen = 2;
		101	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
		102	}
		103	else
		104	{
		105	*clen = (STRLEN)-1;
		106	return (UV)-1;
		107	}
		108	}
		109
		110	/////////////////////////////////////////////////////////////////////////////
		111	// encoder
27		112
28	// structure used for encoding JSON	113	// structure used for encoding JSON
29	typedef struct	114	typedef struct
30	{	115	{
31	char *cur;	116	char *cur; // SvPVX (sv) + current output position
32	STRLEN len; // SvLEN (sv)
33	char *end; // SvEND (sv)	117	char *end; // SvEND (sv)
34	SV *sv;	118	SV *sv; // result scalar
35	UV flags;	119	JSON json;
36	int max_recurse;	120	U32 indent; // indentation level
37	int indent;	121	U32 maxdepth; // max. indentation/recursion level
38	} enc_t;	122	} enc_t;
39		123
40	// structure used for decoding JSON	124	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	static void
59	shrink (SV *sv)
60	{
61	sv_utf8_downgrade (sv, 1);
62	#ifdef SvPV_shrink_to_cur
63	SvPV_shrink_to_cur (sv);
64	#endif
65	}
66
67	/////////////////////////////////////////////////////////////////////////////
68
69	static void
70	need (enc_t *enc, STRLEN len)	125	need (enc_t *enc, STRLEN len)
71	{	126	{
72	if (enc->cur + len >= enc->end)	127	if (expect_false (enc->cur + len >= enc->end))
73	{	128	{
74	STRLEN cur = enc->cur - SvPVX (enc->sv);	129	STRLEN cur = enc->cur - SvPVX (enc->sv);
75	SvGROW (enc->sv, cur + len + 1);	130	SvGROW (enc->sv, cur + len + 1);
76	enc->cur = SvPVX (enc->sv) + cur;	131	enc->cur = SvPVX (enc->sv) + cur;
77	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv);	132	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
78	}	133	}
79	}	134	}
80		135
81	static void	136	inline void
82	encode_ch (enc_t *enc, char ch)	137	encode_ch (enc_t *enc, char ch)
83	{	138	{
84	need (enc, 1);	139	need (enc, 1);
85	*enc->cur++ = ch;	140	*enc->cur++ = ch;
86	}	141	}
…		…
94		149
95	while (str < end)	150	while (str < end)
96	{	151	{
97	unsigned char ch = *(unsigned char *)str;	152	unsigned char ch = *(unsigned char *)str;
98		153
99	if (ch >= 0x20 && ch < 0x80) // most common case	154	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
100	{	155	{
101	if (ch == '"') // but with slow exceptions	156	if (expect_false (ch == '"')) // but with slow exceptions
102	{	157	{
103	need (enc, len += 1);	158	need (enc, len += 1);
104	*enc->cur++ = '\\';	159	*enc->cur++ = '\\';
105	*enc->cur++ = '"';	160	*enc->cur++ = '"';
106	}	161	}
107	else if (ch == '\\')	162	else if (expect_false (ch == '\\'))
108	{	163	{
109	need (enc, len += 1);	164	need (enc, len += 1);
110	*enc->cur++ = '\\';	165	*enc->cur++ = '\\';
111	*enc->cur++ = '\\';	166	*enc->cur++ = '\\';
112	}	167	}
…		…
130	STRLEN clen;	185	STRLEN clen;
131	UV uch;	186	UV uch;
132		187
133	if (is_utf8)	188	if (is_utf8)
134	{	189	{
135	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);	190	uch = decode_utf8 (str, end - str, &clen);
136	if (clen == (STRLEN)-1)	191	if (clen == (STRLEN)-1)
137	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);	192	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
138	}	193	}
139	else	194	else
140	{	195	{
…		…
143	}	198	}
144		199
145	if (uch > 0x10FFFFUL)	200	if (uch > 0x10FFFFUL)
146	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);	201	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
147		202
148	if (uch < 0x80 || enc->flags & F_ASCII)	203	if (uch < 0x80 || enc->json.flags & F_ASCII || (enc->json.flags & F_LATIN1 && uch > 0xFF))
149	{	204	{
150	if (uch > 0xFFFFUL)	205	if (uch > 0xFFFFUL)
151	{	206	{
152	need (enc, len += 11);	207	need (enc, len += 11);
153	sprintf (enc->cur, "\\u%04x\\u%04x",	208	sprintf (enc->cur, "\\u%04x\\u%04x",
…		…
167	*enc->cur++ = hexdigit [(uch >> 0) & 15];	222	*enc->cur++ = hexdigit [(uch >> 0) & 15];
168	}	223	}
169		224
170	str += clen;	225	str += clen;
171	}	226	}
		227	else if (enc->json.flags & F_LATIN1)
		228	{
		229	*enc->cur++ = uch;
		230	str += clen;
		231	}
172	else if (is_utf8)	232	else if (is_utf8)
173	{	233	{
174	need (enc, len += clen);	234	need (enc, len += clen);
175	do	235	do
176	{	236	{
…		…
178	}	238	}
179	while (--clen);	239	while (--clen);
180	}	240	}
181	else	241	else
182	{	242	{
183	need (enc, len += 10); // never more than 11 bytes needed	243	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
184	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);	244	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
185	++str;	245	++str;
186	}	246	}
187	}	247	}
188	}	248	}
…		…
190		250
191	--len;	251	--len;
192	}	252	}
193	}	253	}
194		254
195	#define INDENT SB \	255	inline void
		256	encode_indent (enc_t *enc)
		257	{
196	if (enc->flags & F_INDENT) \	258	if (enc->json.flags & F_INDENT)
197	{ \	259	{
198	int i_; \	260	int spaces = enc->indent * INDENT_STEP;
199	need (enc, enc->indent); \	261
200	for (i_ = enc->indent * 3; i_--; )\	262	need (enc, spaces);
		263	memset (enc->cur, ' ', spaces);
		264	enc->cur += spaces;
		265	}
		266	}
		267
		268	inline void
		269	encode_space (enc_t *enc)
		270	{
		271	need (enc, 1);
		272	encode_ch (enc, ' ');
		273	}
		274
		275	inline void
		276	encode_nl (enc_t *enc)
		277	{
		278	if (enc->json.flags & F_INDENT)
		279	{
		280	need (enc, 1);
201	encode_ch (enc, ' '); \	281	encode_ch (enc, '\n');
202	} \	282	}
203	SE	283	}
204		284
205	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	285	inline void
206	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	286	encode_comma (enc_t *enc)
207	#define COMMA SB \	287	{
208	encode_ch (enc, ','); \	288	encode_ch (enc, ',');
		289
209	if (enc->flags & F_INDENT) \	290	if (enc->json.flags & F_INDENT)
210	NL; \	291	encode_nl (enc);
211	else if (enc->flags & F_SPACE_AFTER) \	292	else if (enc->json.flags & F_SPACE_AFTER)
212	SPACE; \	293	encode_space (enc);
213	SE	294	}
214		295
215	static void encode_sv (enc_t *enc, SV *sv);	296	static void encode_sv (enc_t *enc, SV *sv);
216		297
217	static void	298	static void
218	encode_av (enc_t *enc, AV *av)	299	encode_av (enc_t *enc, AV *av)
219	{	300	{
220	int i, len = av_len (av);	301	int i, len = av_len (av);
221		302
222	encode_ch (enc, '['); NL;	303	if (enc->indent >= enc->maxdepth)
		304	croak ("data structure too deep (hit recursion limit)");
		305
		306	encode_ch (enc, '['); encode_nl (enc);
223	++enc->indent;	307	++enc->indent;
224		308
225	for (i = 0; i <= len; ++i)	309	for (i = 0; i <= len; ++i)
226	{	310	{
227	INDENT;	311	encode_indent (enc);
228	encode_sv (enc, *av_fetch (av, i, 0));	312	encode_sv (enc, *av_fetch (av, i, 0));
229		313
230	if (i < len)	314	if (i < len)
231	COMMA;	315	encode_comma (enc);
232	}	316	}
233		317
234	NL;	318	encode_nl (enc);
235		319
236	--enc->indent;	320	--enc->indent;
237	INDENT; encode_ch (enc, ']');	321	encode_indent (enc); encode_ch (enc, ']');
238	}	322	}
239		323
240	static void	324	static void
241	encode_he (enc_t *enc, HE *he)	325	encode_he (enc_t *enc, HE *he)
242	{	326	{
…		…
256	else	340	else
257	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	341	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
258		342
259	encode_ch (enc, '"');	343	encode_ch (enc, '"');
260		344
261	if (enc->flags & F_SPACE_BEFORE) SPACE;	345	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
262	encode_ch (enc, ':');	346	encode_ch (enc, ':');
263	if (enc->flags & F_SPACE_AFTER ) SPACE;	347	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
264	encode_sv (enc, HeVAL (he));	348	encode_sv (enc, HeVAL (he));
265	}	349	}
266		350
267	// compare hash entries, used when all keys are bytestrings	351	// compare hash entries, used when all keys are bytestrings
268	static int	352	static int
…		…
274	HE *b = *(HE **)b_;	358	HE *b = *(HE **)b_;
275		359
276	STRLEN la = HeKLEN (a);	360	STRLEN la = HeKLEN (a);
277	STRLEN lb = HeKLEN (b);	361	STRLEN lb = HeKLEN (b);
278		362
279	if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	363	if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))
280	cmp = la < lb ? -1 : la == lb ? 0 : 1;	364	cmp = la - lb;
281		365
282	return cmp;	366	return cmp;
283	}	367	}
284		368
285	// compare hash entries, used when some keys are sv's or utf-x	369	// compare hash entries, used when some keys are sv's or utf-x
…		…
292	static void	376	static void
293	encode_hv (enc_t *enc, HV *hv)	377	encode_hv (enc_t *enc, HV *hv)
294	{	378	{
295	int count, i;	379	int count, i;
296		380
		381	if (enc->indent >= enc->maxdepth)
		382	croak ("data structure too deep (hit recursion limit)");
		383
297	encode_ch (enc, '{'); NL; ++enc->indent;	384	encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
298		385
299	if ((count = hv_iterinit (hv)))	386	if ((count = hv_iterinit (hv)))
300	{	387	{
301	// for canonical output we have to sort by keys first	388	// for canonical output we have to sort by keys first
302	// actually, this is mostly due to the stupid so-called	389	// actually, this is mostly due to the stupid so-called
303	// security workaround added somewhere in 5.8.x.	390	// security workaround added somewhere in 5.8.x.
304	// that randomises hash orderings	391	// that randomises hash orderings
305	if (enc->flags & F_CANONICAL)	392	if (enc->json.flags & F_CANONICAL)
306	{	393	{
307	HE *he, *hes [count];
308	int fast = 1;	394	int fast = 1;
		395	HE *he;
		396	#if defined(__BORLANDC__) || defined(_MSC_VER)
		397	HE **hes = _alloca (count * sizeof (HE));
		398	#else
		399	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
		400	#endif
309		401
310	i = 0;	402	i = 0;
311	while ((he = hv_iternext (hv)))	403	while ((he = hv_iternext (hv)))
312	{	404	{
313	hes [i++] = he;	405	hes [i++] = he;
…		…
337	LEAVE;	429	LEAVE;
338	}	430	}
339		431
340	for (i = 0; i < count; ++i)	432	for (i = 0; i < count; ++i)
341	{	433	{
342	INDENT;	434	encode_indent (enc);
343	encode_he (enc, hes [i]);	435	encode_he (enc, hes [i]);
344		436
345	if (i < count - 1)	437	if (i < count - 1)
346	COMMA;	438	encode_comma (enc);
347	}
348
349	NL;	439	}
		440
		441	encode_nl (enc);
350	}	442	}
351	else	443	else
352	{	444	{
353	SV *sv;
354	HE *he = hv_iternext (hv);	445	HE *he = hv_iternext (hv);
355		446
356	for (;;)	447	for (;;)
357	{	448	{
358	INDENT;	449	encode_indent (enc);
359	encode_he (enc, he);	450	encode_he (enc, he);
360		451
361	if (!(he = hv_iternext (hv)))	452	if (!(he = hv_iternext (hv)))
362	break;	453	break;
363		454
364	COMMA;	455	encode_comma (enc);
365	}
366
367	NL;	456	}
		457
		458	encode_nl (enc);
368	}	459	}
369	}	460	}
370		461
371	--enc->indent; INDENT; encode_ch (enc, '}');	462	--enc->indent; encode_indent (enc); encode_ch (enc, '}');
		463	}
		464
		465	// encode objects, arrays and special \0=false and \1=true values.
		466	static void
		467	encode_rv (enc_t *enc, SV *sv)
		468	{
		469	svtype svt;
		470
		471	SvGETMAGIC (sv);
		472	svt = SvTYPE (sv);
		473
		474	if (expect_false (SvOBJECT (sv)))
		475	{
		476	if (SvSTASH (sv) == json_boolean_stash)
		477	{
		478	if (SvIV (sv))
		479	encode_str (enc, "true", 4, 0);
		480	else
		481	encode_str (enc, "false", 5, 0);
		482	}
		483	else
		484	{
		485	#if 0
		486	if (0 && sv_derived_from (rv, "JSON::Literal"))
		487	{
		488	// not yet
		489	}
		490	#endif
		491	if (enc->json.flags & F_CONV_BLESSED)
		492	{
		493	// we re-bless the reference to get overload and other niceties right
		494	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 1);
		495
		496	if (to_json)
		497	{
		498	dSP; ENTER; SAVETMPS; PUSHMARK (SP);
		499	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		500
		501	// calling with G_SCALAR ensures that we always get a 1 reutrn value
		502	// check anyways.
		503	PUTBACK;
		504	assert (1 == call_sv ((SV *)GvCV (to_json), G_SCALAR));
		505	SPAGAIN;
		506
		507	encode_sv (enc, POPs);
		508
		509	FREETMPS; LEAVE;
		510	}
		511	else if (enc->json.flags & F_ALLOW_BLESSED)
		512	encode_str (enc, "null", 4, 0);
		513	else
		514	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		515	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		516	}
		517	else if (enc->json.flags & F_ALLOW_BLESSED)
		518	encode_str (enc, "null", 4, 0);
		519	else
		520	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		521	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		522	}
		523	}
		524	else if (svt == SVt_PVHV)
		525	encode_hv (enc, (HV *)sv);
		526	else if (svt == SVt_PVAV)
		527	encode_av (enc, (AV *)sv);
		528	else if (svt < SVt_PVAV)
		529	{
		530	STRLEN len = 0;
		531	char *pv = svt ? SvPV (sv, len) : 0;
		532
		533	if (len == 1 && *pv == '1')
		534	encode_str (enc, "true", 4, 0);
		535	else if (len == 1 && *pv == '0')
		536	encode_str (enc, "false", 5, 0);
		537	else
		538	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		539	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		540	}
		541	else
		542	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		543	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
372	}	544	}
373		545
374	static void	546	static void
375	encode_sv (enc_t *enc, SV *sv)	547	encode_sv (enc_t *enc, SV *sv)
376	{	548	{
…		…
384	encode_str (enc, str, len, SvUTF8 (sv));	556	encode_str (enc, str, len, SvUTF8 (sv));
385	encode_ch (enc, '"');	557	encode_ch (enc, '"');
386	}	558	}
387	else if (SvNOKp (sv))	559	else if (SvNOKp (sv))
388	{	560	{
		561	// trust that perl will do the right thing w.r.t. JSON syntax.
389	need (enc, NV_DIG + 32);	562	need (enc, NV_DIG + 32);
390	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	563	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
391	enc->cur += strlen (enc->cur);	564	enc->cur += strlen (enc->cur);
392	}	565	}
393	else if (SvIOKp (sv))	566	else if (SvIOKp (sv))
394	{	567	{
395	need (enc, 64);	568	// we assume we can always read an IV as a UV
		569	if (SvUV (sv) & ~(UV)0x7fff)
		570	{
		571	// large integer, use the (rather slow) snprintf way.
		572	need (enc, sizeof (UV) * 3);
396	enc->cur +=	573	enc->cur +=
397	SvIsUV(sv)	574	SvIsUV(sv)
398	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	575	? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
399	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	576	: snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
		577	}
		578	else
		579	{
		580	// optimise the "small number case"
		581	// code will likely be branchless and use only a single multiplication
		582	I32 i = SvIV (sv);
		583	U32 u;
		584	char digit, nz = 0;
		585
		586	need (enc, 6);
		587
		588	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		589	u = i < 0 ? -i : i;
		590
		591	// convert to 4.28 fixed-point representation
		592	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		593
		594	// now output digit by digit, each time masking out the integer part
		595	// and multiplying by 5 while moving the decimal point one to the right,
		596	// resulting in a net multiplication by 10.
		597	// we always write the digit to memory but conditionally increment
		598	// the pointer, to ease the usage of conditional move instructions.
		599	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
		600	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
		601	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
		602	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
		603	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		604	}
400	}	605	}
401	else if (SvROK (sv))	606	else if (SvROK (sv))
402	{	607	encode_rv (enc, SvRV (sv));
403	SV *rv = SvRV (sv);
404
405	if (!--enc->max_recurse)
406	croak ("data structure too deep (hit recursion limit)");
407
408	switch (SvTYPE (rv))
409	{
410	case SVt_PVAV: encode_av (enc, (AV *)rv); break;
411	case SVt_PVHV: encode_hv (enc, (HV *)rv); break;
412
413	default:
414	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
415	SvPV_nolen (sv));
416	}
417	}
418	else if (!SvOK (sv))	608	else if (!SvOK (sv))
419	encode_str (enc, "null", 4, 0);	609	encode_str (enc, "null", 4, 0);
420	else	610	else
421	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",	611	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
422	SvPV_nolen (sv), SvFLAGS (sv));	612	SvPV_nolen (sv), SvFLAGS (sv));
423	}	613	}
424		614
425	static SV *	615	static SV *
426	encode_json (SV *scalar, UV flags)	616	encode_json (SV *scalar, JSON *json)
427	{	617	{
		618	enc_t enc;
		619
428	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))	620	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
429	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");	621	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
430		622
431	enc_t enc;	623	enc.json = *json;
432	enc.flags = flags;
433	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	624	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
434	enc.cur = SvPVX (enc.sv);	625	enc.cur = SvPVX (enc.sv);
435	enc.end = SvEND (enc.sv);	626	enc.end = SvEND (enc.sv);
436	enc.max_recurse = 0;
437	enc.indent = 0;	627	enc.indent = 0;
		628	enc.maxdepth = DEC_DEPTH (enc.json.flags);
438		629
439	SvPOK_only (enc.sv);	630	SvPOK_only (enc.sv);
440	encode_sv (&enc, scalar);	631	encode_sv (&enc, scalar);
441		632
		633	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		634	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		635
442	if (!(flags & (F_ASCII | F_UTF8)))	636	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
443	SvUTF8_on (enc.sv);	637	SvUTF8_on (enc.sv);
444		638
445	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
446
447	if (enc.flags & F_SHRINK)	639	if (enc.json.flags & F_SHRINK)
448	shrink (enc.sv);	640	shrink (enc.sv);
449		641
450	return enc.sv;	642	return enc.sv;
451	}	643	}
452		644
453	/////////////////////////////////////////////////////////////////////////////	645	/////////////////////////////////////////////////////////////////////////////
		646	// decoder
454		647
455	#define WS \	648	// structure used for decoding JSON
		649	typedef struct
		650	{
		651	char *cur; // current parser pointer
		652	char *end; // end of input string
		653	const char *err; // parse error, if != 0
		654	JSON json;
		655	U32 depth; // recursion depth
		656	U32 maxdepth; // recursion depth limit
		657	} dec_t;
		658
		659	inline void
		660	decode_ws (dec_t *dec)
		661	{
456	for (;;) \	662	for (;;)
457	{ \	663	{
458	char ch = *dec->cur; \	664	char ch = *dec->cur;
		665
459	if (ch > 0x20 \	666	if (ch > 0x20
460	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	667	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
461	break; \	668	break;
		669
462	++dec->cur; \	670	++dec->cur;
463	}	671	}
		672	}
464		673
465	#define ERR(reason) SB dec->err = reason; goto fail; SE	674	#define ERR(reason) SB dec->err = reason; goto fail; SE
		675
466	#define EXPECT_CH(ch) SB \	676	#define EXPECT_CH(ch) SB \
467	if (*dec->cur != ch) \	677	if (*dec->cur != ch) \
468	ERR (# ch " expected"); \	678	ERR (# ch " expected"); \
469	++dec->cur; \	679	++dec->cur; \
470	SE	680	SE
471		681
		682	#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
		683	#define DEC_DEC_DEPTH --dec->depth
		684
472	static SV *decode_sv (dec_t *dec);	685	static SV *decode_sv (dec_t *dec);
473		686
474	static signed char decode_hexdigit[256];	687	static signed char decode_hexdigit[256];
475		688
476	static UV	689	static UV
477	decode_4hex (dec_t *dec)	690	decode_4hex (dec_t *dec)
478	{	691	{
479	signed char d1, d2, d3, d4;	692	signed char d1, d2, d3, d4;
		693	unsigned char *cur = (unsigned char *)dec->cur;
480		694
481	d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]];	695	d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
482	if (d1 < 0) ERR ("four hexadecimal digits expected");	696	d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
483	d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]];	697	d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
484	if (d2 < 0) ERR ("four hexadecimal digits expected");	698	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
485	d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
486	if (d3 < 0) ERR ("four hexadecimal digits expected");
487	d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
488	if (d4 < 0) ERR ("four hexadecimal digits expected");
489		699
490	dec->cur += 4;	700	dec->cur += 4;
491		701
492	return ((UV)d1) << 12	702	return ((UV)d1) << 12
493	| ((UV)d2) << 8	703	| ((UV)d2) << 8
…		…
496		706
497	fail:	707	fail:
498	return (UV)-1;	708	return (UV)-1;
499	}	709	}
500		710
501	#define APPEND_GROW(n) SB \
502	if (cur + (n) >= end) \
503	{ \
504	STRLEN ofs = cur - SvPVX (sv); \
505	SvGROW (sv, ofs + (n) + 1); \
506	cur = SvPVX (sv) + ofs; \
507	end = SvEND (sv); \
508	} \
509	SE
510
511	#define APPEND_CH(ch) SB \
512	APPEND_GROW (1); \
513	*cur++ = (ch); \
514	SE
515
516	static SV *	711	static SV *
517	decode_str (dec_t *dec)	712	decode_str (dec_t *dec)
518	{	713	{
519	SV *sv = NEWSV (0,2);	714	SV *sv = 0;
520	int utf8 = 0;	715	int utf8 = 0;
521	char *cur = SvPVX (sv);	716	char *dec_cur = dec->cur;
522	char *end = SvEND (sv);
523		717
524	for (;;)	718	do
525	{	719	{
526	unsigned char ch = *(unsigned char *)dec->cur;	720	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		721	char *cur = buf;
527		722
528	if (ch == '"')	723	do
529	break;
530	else if (ch == '\\')
531	{	724	{
532	switch (*++dec->cur)	725	unsigned char ch = *(unsigned char *)dec_cur++;
		726
		727	if (expect_false (ch == '"'))
		728	{
		729	--dec_cur;
		730	break;
533	{	731	}
534	case '\\':	732	else if (expect_false (ch == '\\'))
535	case '/':	733	{
536	case '"': APPEND_CH (*dec->cur++); break;	734	switch (*dec_cur)
537
538	case 'b': APPEND_CH ('\010'); ++dec->cur; break;
539	case 't': APPEND_CH ('\011'); ++dec->cur; break;
540	case 'n': APPEND_CH ('\012'); ++dec->cur; break;
541	case 'f': APPEND_CH ('\014'); ++dec->cur; break;
542	case 'r': APPEND_CH ('\015'); ++dec->cur; break;
543
544	case 'u':
545	{	735	{
546	UV lo, hi;	736	case '\\':
547	++dec->cur;	737	case '/':
		738	case '"': *cur++ = *dec_cur++; break;
548		739
549	hi = decode_4hex (dec);	740	case 'b': ++dec_cur; *cur++ = '\010'; break;
550	if (hi == (UV)-1)	741	case 't': ++dec_cur; *cur++ = '\011'; break;
551	goto fail;	742	case 'n': ++dec_cur; *cur++ = '\012'; break;
		743	case 'f': ++dec_cur; *cur++ = '\014'; break;
		744	case 'r': ++dec_cur; *cur++ = '\015'; break;
552		745
553	// possibly a surrogate pair	746	case 'u':
554	if (hi >= 0xd800 && hi < 0xdc00)
555	{	747	{
556	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	748	UV lo, hi;
557	ERR ("missing low surrogate character in surrogate pair");	749	++dec_cur;
558		750
559	dec->cur += 2;	751	dec->cur = dec_cur;
560
561	lo = decode_4hex (dec);	752	hi = decode_4hex (dec);
		753	dec_cur = dec->cur;
562	if (lo == (UV)-1)	754	if (hi == (UV)-1)
563	goto fail;	755	goto fail;
564		756
		757	// possibly a surrogate pair
		758	if (hi >= 0xd800)
		759	if (hi < 0xdc00)
		760	{
		761	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
		762	ERR ("missing low surrogate character in surrogate pair");
		763
		764	dec_cur += 2;
		765
		766	dec->cur = dec_cur;
		767	lo = decode_4hex (dec);
		768	dec_cur = dec->cur;
		769	if (lo == (UV)-1)
		770	goto fail;
		771
565	if (lo < 0xdc00 || lo >= 0xe000)	772	if (lo < 0xdc00 || lo >= 0xe000)
566	ERR ("surrogate pair expected");	773	ERR ("surrogate pair expected");
567		774
568	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;	775	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
		776	}
		777	else if (hi < 0xe000)
		778	ERR ("missing high surrogate character in surrogate pair");
		779
		780	if (hi >= 0x80)
		781	{
		782	utf8 = 1;
		783
		784	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
		785	}
		786	else
		787	*cur++ = hi;
569	}	788	}
570	else if (hi >= 0xdc00 && hi < 0xe000)
571	ERR ("missing high surrogate character in surrogate pair");
572
573	if (hi >= 0x80)
574	{	789	break;
575	utf8 = 1;
576		790
577	APPEND_GROW (4); // at most 4 bytes for 21 bits
578	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
579	}
580	else	791	default:
581	APPEND_CH (hi);	792	--dec_cur;
		793	ERR ("illegal backslash escape sequence in string");
582	}	794	}
583	break;	795	}
		796	else if (expect_true (ch >= 0x20 && ch <= 0x7f))
		797	*cur++ = ch;
		798	else if (ch >= 0x80)
		799	{
		800	STRLEN clen;
		801	UV uch;
584		802
585	default:
586	--dec->cur;	803	--dec_cur;
587	ERR ("illegal backslash escape sequence in string");	804
		805	uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		806	if (clen == (STRLEN)-1)
		807	ERR ("malformed UTF-8 character in JSON string");
		808
		809	do
		810	*cur++ = *dec_cur++;
		811	while (--clen);
		812
		813	utf8 = 1;
		814	}
		815	else
		816	{
		817	--dec_cur;
		818
		819	if (!ch)
		820	ERR ("unexpected end of string while parsing JSON string");
		821	else
		822	ERR ("invalid character encountered while parsing JSON string");
588	}	823	}
589	}	824	}
590	else if (ch >= 0x20 && ch <= 0x7f)	825	while (cur < buf + SHORT_STRING_LEN);
591	APPEND_CH (*dec->cur++);	826
592	else if (ch >= 0x80)
593	{	827	{
594	STRLEN clen;	828	STRLEN len = cur - buf;
595	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
596	if (clen == (STRLEN)-1)
597	ERR ("malformed UTF-8 character in JSON string");
598		829
599	APPEND_GROW (clen);	830	if (sv)
600	do
601	{	831	{
602	*cur++ = *dec->cur++;	832	SvGROW (sv, SvCUR (sv) + len + 1);
		833	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
		834	SvCUR_set (sv, SvCUR (sv) + len);
603	}	835	}
604	while (--clen);
605
606	utf8 = 1;
607	}
608	else if (dec->cur == dec->end)
609	ERR ("unexpected end of string while parsing json string");
610	else	836	else
611	ERR ("invalid character encountered");	837	sv = newSVpvn (buf, len);
612	}	838	}
		839	}
		840	while (*dec_cur != '"');
613		841
614	++dec->cur;	842	++dec_cur;
615		843
616	SvCUR_set (sv, cur - SvPVX (sv));	844	if (sv)
617		845	{
618	SvPOK_only (sv);	846	SvPOK_only (sv);
619	*SvEND (sv) = 0;	847	*SvEND (sv) = 0;
620		848
621	if (utf8)	849	if (utf8)
622	SvUTF8_on (sv);	850	SvUTF8_on (sv);
		851	}
		852	else
		853	sv = newSVpvn ("", 0);
623		854
624	if (dec->flags & F_SHRINK)	855	dec->cur = dec_cur;
625	shrink (sv);
626
627	return sv;	856	return sv;
628		857
629	fail:	858	fail:
630	SvREFCNT_dec (sv);	859	dec->cur = dec_cur;
631	return 0;	860	return 0;
632	}	861	}
633		862
634	static SV *	863	static SV *
635	decode_num (dec_t *dec)	864	decode_num (dec_t *dec)
…		…
693	is_nv = 1;	922	is_nv = 1;
694	}	923	}
695		924
696	if (!is_nv)	925	if (!is_nv)
697	{	926	{
698	UV uv;	927	// special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
699	int numtype = grok_number (start, dec->cur - start, &uv);	928	if (*start == '-')
700	if (numtype & IS_NUMBER_IN_UV)	929	switch (dec->cur - start)
701	if (numtype & IS_NUMBER_NEG)
702	{	930	{
703	if (uv < (UV)IV_MIN)	931	case 2: return newSViv (-( start [1] - '0' * 1));
704	return newSViv (-(IV)uv);	932	case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
		933	case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		934	case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
705	}	935	}
		936	else
		937	switch (dec->cur - start)
		938	{
		939	case 1: return newSViv ( start [0] - '0' * 1);
		940	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		941	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		942	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		943	}
		944
		945	{
		946	UV uv;
		947	int numtype = grok_number (start, dec->cur - start, &uv);
		948	if (numtype & IS_NUMBER_IN_UV)
		949	if (numtype & IS_NUMBER_NEG)
		950	{
		951	if (uv < (UV)IV_MIN)
		952	return newSViv (-(IV)uv);
		953	}
706	else	954	else
707	return newSVuv (uv);	955	return newSVuv (uv);
		956
		957	// here would likely be the place for bigint support
708	}	958	}
		959	}
709		960
		961	// if we ever support bigint or bigfloat, this is the place for bigfloat
710	return newSVnv (Atof (start));	962	return newSVnv (Atof (start));
711		963
712	fail:	964	fail:
713	return 0;	965	return 0;
714	}	966	}
…		…
716	static SV *	968	static SV *
717	decode_av (dec_t *dec)	969	decode_av (dec_t *dec)
718	{	970	{
719	AV *av = newAV ();	971	AV *av = newAV ();
720		972
721	WS;	973	DEC_INC_DEPTH;
		974	decode_ws (dec);
		975
722	if (*dec->cur == ']')	976	if (*dec->cur == ']')
723	++dec->cur;	977	++dec->cur;
724	else	978	else
725	for (;;)	979	for (;;)
726	{	980	{
…		…
730	if (!value)	984	if (!value)
731	goto fail;	985	goto fail;
732		986
733	av_push (av, value);	987	av_push (av, value);
734		988
735	WS;	989	decode_ws (dec);
736		990
737	if (*dec->cur == ']')	991	if (*dec->cur == ']')
738	{	992	{
739	++dec->cur;	993	++dec->cur;
740	break;	994	break;
…		…
744	ERR (", or ] expected while parsing array");	998	ERR (", or ] expected while parsing array");
745		999
746	++dec->cur;	1000	++dec->cur;
747	}	1001	}
748		1002
		1003	DEC_DEC_DEPTH;
749	return newRV_noinc ((SV *)av);	1004	return newRV_noinc ((SV *)av);
750		1005
751	fail:	1006	fail:
752	SvREFCNT_dec (av);	1007	SvREFCNT_dec (av);
		1008	DEC_DEC_DEPTH;
753	return 0;	1009	return 0;
754	}	1010	}
755		1011
756	static SV *	1012	static SV *
757	decode_hv (dec_t *dec)	1013	decode_hv (dec_t *dec)
758	{	1014	{
		1015	SV *sv;
759	HV *hv = newHV ();	1016	HV *hv = newHV ();
760		1017
761	WS;	1018	DEC_INC_DEPTH;
		1019	decode_ws (dec);
		1020
762	if (*dec->cur == '}')	1021	if (*dec->cur == '}')
763	++dec->cur;	1022	++dec->cur;
764	else	1023	else
765	for (;;)	1024	for (;;)
766	{	1025	{
		1026	decode_ws (dec); EXPECT_CH ('"');
		1027
		1028	// heuristic: assume that
		1029	// a) decode_str + hv_store_ent are abysmally slow.
		1030	// b) most hash keys are short, simple ascii text.
		1031	// => try to "fast-match" such strings to avoid
		1032	// the overhead of decode_str + hv_store_ent.
		1033	{
767	SV *key, *value;	1034	SV *value;
		1035	char *p = dec->cur;
		1036	char *e = p + 24; // only try up to 24 bytes
768		1037
769	WS; EXPECT_CH ('"');	1038	for (;;)
770
771	key = decode_str (dec);
772	if (!key)
773	goto fail;
774
775	WS; EXPECT_CH (':');
776
777	value = decode_sv (dec);
778	if (!value)
779	{	1039	{
		1040	// the >= 0x80 is true on most architectures
		1041	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1042	{
		1043	// slow path, back up and use decode_str
		1044	SV *key = decode_str (dec);
		1045	if (!key)
		1046	goto fail;
		1047
		1048	decode_ws (dec); EXPECT_CH (':');
		1049
		1050	value = decode_sv (dec);
		1051	if (!value)
		1052	{
		1053	SvREFCNT_dec (key);
		1054	goto fail;
		1055	}
		1056
		1057	hv_store_ent (hv, key, value, 0);
780	SvREFCNT_dec (key);	1058	SvREFCNT_dec (key);
		1059
		1060	break;
		1061	}
		1062	else if (*p == '"')
		1063	{
		1064	// fast path, got a simple key
		1065	char *key = dec->cur;
		1066	int len = p - key;
		1067	dec->cur = p + 1;
		1068
		1069	decode_ws (dec); EXPECT_CH (':');
		1070
		1071	value = decode_sv (dec);
		1072	if (!value)
781	goto fail;	1073	goto fail;
		1074
		1075	hv_store (hv, key, len, value, 0);
		1076
		1077	break;
		1078	}
		1079
		1080	++p;
782	}	1081	}
783
784	//TODO: optimise
785	hv_store_ent (hv, key, value, 0);
786
787	WS;	1082	}
		1083
		1084	decode_ws (dec);
788		1085
789	if (*dec->cur == '}')	1086	if (*dec->cur == '}')
790	{	1087	{
791	++dec->cur;	1088	++dec->cur;
792	break;	1089	break;
…		…
796	ERR (", or } expected while parsing object/hash");	1093	ERR (", or } expected while parsing object/hash");
797		1094
798	++dec->cur;	1095	++dec->cur;
799	}	1096	}
800		1097
		1098	DEC_DEC_DEPTH;
801	return newRV_noinc ((SV *)hv);	1099	sv = newRV_noinc ((SV *)hv);
		1100
		1101	// check filter callbacks
		1102	if (dec->json.flags & F_HOOK)
		1103	{
		1104	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1105	{
		1106	HE *cb, *he;
		1107
		1108	hv_iterinit (hv);
		1109	he = hv_iternext (hv);
		1110	hv_iterinit (hv);
		1111
		1112	// the next line creates a mortal sv each time its called.
		1113	// might want to optimise this for common cases.
		1114	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1115
		1116	if (cb)
		1117	{
		1118	int count;
		1119	ENTER; SAVETMPS;
		1120
		1121	dSP; PUSHMARK (SP);
		1122	XPUSHs (HeVAL (he));
		1123
		1124	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1125
		1126	if (count == 1)
		1127	{
		1128	sv = newSVsv (POPs);
		1129	FREETMPS; LEAVE;
		1130	return sv;
		1131	}
		1132
		1133	FREETMPS; LEAVE;
		1134	}
		1135	}
		1136
		1137	if (dec->json.cb_object)
		1138	{
		1139	int count;
		1140	ENTER; SAVETMPS;
		1141
		1142	dSP; ENTER; SAVETMPS; PUSHMARK (SP);
		1143	XPUSHs (sv_2mortal (sv));
		1144
		1145	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1146
		1147	if (count == 1)
		1148	{
		1149	sv = newSVsv (POPs);
		1150	FREETMPS; LEAVE;
		1151	return sv;
		1152	}
		1153
		1154	SvREFCNT_inc (sv);
		1155	FREETMPS; LEAVE;
		1156	}
		1157	}
		1158
		1159	return sv;
802		1160
803	fail:	1161	fail:
804	SvREFCNT_dec (hv);	1162	SvREFCNT_dec (hv);
		1163	DEC_DEC_DEPTH;
805	return 0;	1164	return 0;
806	}	1165	}
807		1166
808	static SV *	1167	static SV *
809	decode_sv (dec_t *dec)	1168	decode_sv (dec_t *dec)
810	{	1169	{
811	WS;	1170	decode_ws (dec);
		1171
		1172	// the beauty of JSON: you need exactly one character lookahead
		1173	// to parse anything.
812	switch (*dec->cur)	1174	switch (*dec->cur)
813	{	1175	{
814	case '"': ++dec->cur; return decode_str (dec);	1176	case '"': ++dec->cur; return decode_str (dec);
815	case '[': ++dec->cur; return decode_av (dec);	1177	case '[': ++dec->cur; return decode_av (dec);
816	case '{': ++dec->cur; return decode_hv (dec);	1178	case '{': ++dec->cur; return decode_hv (dec);
…		…
822		1184
823	case 't':	1185	case 't':
824	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1186	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
825	{	1187	{
826	dec->cur += 4;	1188	dec->cur += 4;
827	return newSViv (1);	1189	return SvREFCNT_inc (json_true);
828	}	1190	}
829	else	1191	else
830	ERR ("'true' expected");	1192	ERR ("'true' expected");
831		1193
832	break;	1194	break;
833		1195
834	case 'f':	1196	case 'f':
835	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1197	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
836	{	1198	{
837	dec->cur += 5;	1199	dec->cur += 5;
838	return newSViv (0);	1200	return SvREFCNT_inc (json_false);
839	}	1201	}
840	else	1202	else
841	ERR ("'false' expected");	1203	ERR ("'false' expected");
842		1204
843	break;	1205	break;
…		…
852	ERR ("'null' expected");	1214	ERR ("'null' expected");
853		1215
854	break;	1216	break;
855		1217
856	default:	1218	default:
857	ERR ("malformed json string, neither array, object, number, string or atom");	1219	ERR ("malformed JSON string, neither array, object, number, string or atom");
858	break;	1220	break;
859	}	1221	}
860		1222
861	fail:	1223	fail:
862	return 0;	1224	return 0;
863	}	1225	}
864		1226
865	static SV *	1227	static SV *
866	decode_json (SV *string, UV flags)	1228	decode_json (SV *string, JSON *json, UV *offset_return)
867	{	1229	{
		1230	dec_t dec;
		1231	UV offset;
868	SV *sv;	1232	SV *sv;
869		1233
		1234	SvGETMAGIC (string);
		1235	SvUPGRADE (string, SVt_PV);
		1236
		1237	if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
		1238	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1239	(unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
		1240
870	if (flags & F_UTF8)	1241	if (json->flags & F_UTF8)
871	sv_utf8_downgrade (string, 0);	1242	sv_utf8_downgrade (string, 0);
872	else	1243	else
873	sv_utf8_upgrade (string);	1244	sv_utf8_upgrade (string);
874		1245
875	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1246	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
876		1247
877	dec_t dec;	1248	dec.json = *json;
878	dec.flags = flags;
879	dec.cur = SvPVX (string);	1249	dec.cur = SvPVX (string);
880	dec.end = SvEND (string);	1250	dec.end = SvEND (string);
881	dec.err = 0;	1251	dec.err = 0;
		1252	dec.depth = 0;
		1253	dec.maxdepth = DEC_DEPTH (dec.json.flags);
882		1254
		1255	if (dec.json.cb_object || dec.json.cb_sk_object)
		1256	dec.json.flags |= F_HOOK;
		1257
		1258	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
883	sv = decode_sv (&dec);	1259	sv = decode_sv (&dec);
884		1260
		1261	if (!(offset_return || !sv))
		1262	{
		1263	// check for trailing garbage
		1264	decode_ws (&dec);
		1265
		1266	if (*dec.cur)
		1267	{
		1268	dec.err = "garbage after JSON object";
		1269	SvREFCNT_dec (sv);
		1270	sv = 0;
		1271	}
		1272	}
		1273
		1274	if (offset_return || !sv)
		1275	{
		1276	offset = dec.json.flags & F_UTF8
		1277	? dec.cur - SvPVX (string)
		1278	: utf8_distance (dec.cur, SvPVX (string));
		1279
		1280	if (offset_return)
		1281	*offset_return = offset;
		1282	}
		1283
885	if (!sv)	1284	if (!sv)
886	{	1285	{
887	IV offset = dec.flags & F_UTF8
888	? dec.cur - SvPVX (string)
889	: utf8_distance (dec.cur, SvPVX (string));
890	SV *uni = sv_newmortal ();	1286	SV *uni = sv_newmortal ();
891		1287
892	// horrible hack to silence warning inside pv_uni_display	1288	// horrible hack to silence warning inside pv_uni_display
893	COP cop = *PL_curcop;	1289	COP cop = *PL_curcop;
894	cop.cop_warnings = pWARN_NONE;	1290	cop.cop_warnings = pWARN_NONE;
…		…
896	SAVEVPTR (PL_curcop);	1292	SAVEVPTR (PL_curcop);
897	PL_curcop = &cop;	1293	PL_curcop = &cop;
898	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1294	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
899	LEAVE;	1295	LEAVE;
900		1296
901	croak ("%s, at character offset %d (%s)",	1297	croak ("%s, at character offset %d [\"%s\"]",
902	dec.err,	1298	dec.err,
903	(int)offset,	1299	(int)offset,
904	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1300	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
905	}	1301	}
906		1302
907	sv = sv_2mortal (sv);	1303	sv = sv_2mortal (sv);
908		1304
909	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1305	if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
910	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");	1306	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
911		1307
912	return sv;	1308	return sv;
913	}	1309	}
914		1310
		1311	/////////////////////////////////////////////////////////////////////////////
		1312	// XS interface functions
		1313
915	MODULE = JSON::XS PACKAGE = JSON::XS	1314	MODULE = JSON::XS PACKAGE = JSON::XS
916		1315
917	BOOT:	1316	BOOT:
918	{	1317	{
919	int i;	1318	int i;
920		1319
921	memset (decode_hexdigit, 0xff, 256);
922	for (i = 10; i--; )	1320	for (i = 0; i < 256; ++i)
923	decode_hexdigit ['0' + i] = i;	1321	decode_hexdigit [i] =
		1322	i >= '0' && i <= '9' ? i - '0'
		1323	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1324	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1325	: -1;
924		1326
925	for (i = 7; i--; )	1327	json_stash = gv_stashpv ("JSON::XS" , 1);
		1328	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1329
		1330	json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
		1331	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1332	}
		1333
		1334	PROTOTYPES: DISABLE
		1335
		1336	void new (char *klass)
		1337	PPCODE:
		1338	{
		1339	SV *pv = NEWSV (0, sizeof (JSON));
		1340	SvPOK_only (pv);
		1341	Zero (SvPVX (pv), 1, JSON);
		1342	((JSON *)SvPVX (pv))->flags = F_DEFAULT;
		1343	XPUSHs (sv_2mortal (sv_bless (newRV_noinc (pv), json_stash)));
		1344	}
		1345
		1346	void ascii (JSON *self, int enable = 1)
		1347	ALIAS:
		1348	ascii = F_ASCII
		1349	latin1 = F_LATIN1
		1350	utf8 = F_UTF8
		1351	indent = F_INDENT
		1352	canonical = F_CANONICAL
		1353	space_before = F_SPACE_BEFORE
		1354	space_after = F_SPACE_AFTER
		1355	pretty = F_PRETTY
		1356	allow_nonref = F_ALLOW_NONREF
		1357	shrink = F_SHRINK
		1358	allow_blessed = F_ALLOW_BLESSED
		1359	convert_blessed = F_CONV_BLESSED
		1360	PPCODE:
		1361	{
		1362	if (enable)
		1363	self->flags |= ix;
		1364	else
		1365	self->flags &= ~ix;
		1366
		1367	XPUSHs (ST (0));
		1368	}
		1369
		1370	void max_depth (JSON *self, UV max_depth = 0x80000000UL)
		1371	PPCODE:
		1372	{
		1373	UV log2 = 0;
		1374
		1375	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
		1376
		1377	while ((1UL << log2) < max_depth)
		1378	++log2;
		1379
		1380	self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
		1381
		1382	XPUSHs (ST (0));
		1383	}
		1384
		1385	void max_size (JSON *self, UV max_size = 0)
		1386	PPCODE:
		1387	{
		1388	UV log2 = 0;
		1389
		1390	if (max_size > 0x80000000UL) max_size = 0x80000000UL;
		1391	if (max_size == 1) max_size = 2;
		1392
		1393	while ((1UL << log2) < max_size)
		1394	++log2;
		1395
		1396	self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
		1397
		1398	XPUSHs (ST (0));
		1399	}
		1400
		1401	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
		1402	PPCODE:
		1403	{
		1404	SvREFCNT_dec (self->cb_object);
		1405	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
		1406
		1407	XPUSHs (ST (0));
		1408	}
		1409
		1410	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
		1411	PPCODE:
		1412	{
		1413	if (!self->cb_sk_object)
		1414	self->cb_sk_object = newHV ();
		1415
		1416	if (SvOK (cb))
		1417	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1418	else
926	{	1419	{
927	decode_hexdigit ['a' + i] = 10 + i;	1420	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
928	decode_hexdigit ['A' + i] = 10 + i;	1421
		1422	if (!HvKEYS (self->cb_sk_object))
		1423	{
		1424	SvREFCNT_dec (self->cb_sk_object);
		1425	self->cb_sk_object = 0;
		1426	}
929	}	1427	}
930		1428
931	json_stash = gv_stashpv ("JSON::XS", 1);	1429	XPUSHs (ST (0));
932	}	1430	}
933		1431
934	PROTOTYPES: DISABLE	1432	void encode (JSON *self, SV *scalar)
		1433	PPCODE:
		1434	XPUSHs (encode_json (scalar, self));
935		1435
936	SV *new (char *dummy)	1436	void decode (JSON *self, SV *jsonstr)
		1437	PPCODE:
		1438	XPUSHs (decode_json (jsonstr, self, 0));
		1439
		1440	void decode_prefix (JSON *self, SV *jsonstr)
		1441	PPCODE:
		1442	{
		1443	UV offset;
		1444	EXTEND (SP, 2);
		1445	PUSHs (decode_json (jsonstr, self, &offset));
		1446	PUSHs (sv_2mortal (newSVuv (offset)));
		1447	}
		1448
		1449	void DESTROY (JSON *self)
937	CODE:	1450	CODE:
938	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1451	SvREFCNT_dec (self->cb_sk_object);
939	OUTPUT:	1452	SvREFCNT_dec (self->cb_object);
940	RETVAL
941
942	SV *ascii (SV *self, int enable = 1)
943	ALIAS:
944	ascii = F_ASCII
945	utf8 = F_UTF8
946	indent = F_INDENT
947	canonical = F_CANONICAL
948	space_before = F_SPACE_BEFORE
949	space_after = F_SPACE_AFTER
950	pretty = F_PRETTY
951	allow_nonref = F_ALLOW_NONREF
952	shrink = F_SHRINK
953	CODE:
954	{
955	UV *uv = SvJSON (self);
956	if (enable)
957	*uv |= ix;
958	else
959	*uv &= ~ix;
960
961	RETVAL = newSVsv (self);
962	}
963	OUTPUT:
964	RETVAL
965
966	void encode (SV *self, SV *scalar)
967	PPCODE:
968	XPUSHs (encode_json (scalar, *SvJSON (self)));
969
970	void decode (SV *self, SV *jsonstr)
971	PPCODE:
972	XPUSHs (decode_json (jsonstr, *SvJSON (self)));
973		1453
974	PROTOTYPES: ENABLE	1454	PROTOTYPES: ENABLE
975		1455
976	void to_json (SV *scalar)	1456	void to_json (SV *scalar)
977	PPCODE:	1457	PPCODE:
		1458	{
		1459	JSON json = { F_DEFAULT | F_UTF8 };
978	XPUSHs (encode_json (scalar, F_UTF8));	1460	XPUSHs (encode_json (scalar, &json));
		1461	}
979		1462
980	void from_json (SV *jsonstr)	1463	void from_json (SV *jsonstr)
981	PPCODE:	1464	PPCODE:
		1465	{
		1466	JSON json = { F_DEFAULT | F_UTF8 };
982	XPUSHs (decode_json (jsonstr, F_UTF8));	1467	XPUSHs (decode_json (jsonstr, &json, 0));
		1468	}
983		1469

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