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Comparing JSON-XS/XS.xs (file contents):
Revision 1.6 by root, Fri Mar 23 15:10:55 2007 UTC vs.
Revision 1.61 by root, Sun Aug 26 21:56:47 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
17	#define F_SHRINK 0x00000100	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 ))
18		40
19	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	41	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
20	#define F_DEFAULT 0	42	#define F_DEFAULT (9UL << S_MAXDEPTH)
21		43
22	#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
23		48
24	#define SB do {	49	#define SB do {
25	#define SE } while (0)	50	#define SE } while (0)
26		51
27	static HV *json_stash;	52	#if __GNUC__ >= 3
		53	# define expect(expr,value) __builtin_expect ((expr),(value))
		54	# define inline inline
		55	#else
		56	# define expect(expr,value) (expr)
		57	# define inline static
		58	#endif
		59
		60	#define expect_false(expr) expect ((expr) != 0, 0)
		61	#define expect_true(expr) expect ((expr) != 0, 1)
		62
		63	#ifdef USE_ITHREADS
		64	# define JSON_SLOW 1
		65	# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
		66	#else
		67	# define JSON_SLOW 0
		68	# define JSON_STASH json_stash
		69	#endif
		70
		71	static HV *json_stash, *json_boolean_stash; // JSON::XS::
		72	static SV *json_true, *json_false;
		73
		74	typedef struct {
		75	U32 flags;
		76	SV *cb_object;
		77	HV *cb_sk_object;
		78	} JSON;
		79
		80	/////////////////////////////////////////////////////////////////////////////
		81	// utility functions
		82
		83	inline void
		84	shrink (SV *sv)
		85	{
		86	sv_utf8_downgrade (sv, 1);
		87	if (SvLEN (sv) > SvCUR (sv) + 1)
		88	{
		89	#ifdef SvPV_shrink_to_cur
		90	SvPV_shrink_to_cur (sv);
		91	#elif defined (SvPV_renew)
		92	SvPV_renew (sv, SvCUR (sv) + 1);
		93	#endif
		94	}
		95	}
		96
		97	// decode an utf-8 character and return it, or (UV)-1 in
		98	// case of an error.
		99	// we special-case "safe" characters from U+80 .. U+7FF,
		100	// but use the very good perl function to parse anything else.
		101	// note that we never call this function for a ascii codepoints
		102	inline UV
		103	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
		104	{
		105	if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
		106	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		107	else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
		108	{
		109	*clen = 2;
		110	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
		111	}
		112	else
		113	{
		114	*clen = (STRLEN)-1;
		115	return (UV)-1;
		116	}
		117	}
		118
		119	/////////////////////////////////////////////////////////////////////////////
		120	// encoder
28		121
29	// structure used for encoding JSON	122	// structure used for encoding JSON
30	typedef struct	123	typedef struct
31	{	124	{
32	char *cur;	125	char *cur; // SvPVX (sv) + current output position
33	STRLEN len; // SvLEN (sv)
34	char *end; // SvEND (sv)	126	char *end; // SvEND (sv)
35	SV *sv;	127	SV *sv; // result scalar
36	UV flags;	128	JSON json;
37	int max_recurse;	129	U32 indent; // indentation level
38	int indent;	130	U32 maxdepth; // max. indentation/recursion level
39	} enc_t;	131	} enc_t;
40		132
41	// structure used for decoding JSON	133	inline void
42	typedef struct
43	{
44	char *cur;
45	char *end;
46	const char *err;
47	UV flags;
48	} dec_t;
49
50	static UV *
51	SvJSON (SV *sv)
52	{
53	if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
54	croak ("object is not of type JSON::XS");
55
56	return &SvUVX (SvRV (sv));
57	}
58
59	/////////////////////////////////////////////////////////////////////////////
60
61	static void
62	need (enc_t *enc, STRLEN len)	134	need (enc_t *enc, STRLEN len)
63	{	135	{
64	if (enc->cur + len >= enc->end)	136	if (expect_false (enc->cur + len >= enc->end))
65	{	137	{
66	STRLEN cur = enc->cur - SvPVX (enc->sv);	138	STRLEN cur = enc->cur - SvPVX (enc->sv);
67	SvGROW (enc->sv, cur + len + 1);	139	SvGROW (enc->sv, cur + len + 1);
68	enc->cur = SvPVX (enc->sv) + cur;	140	enc->cur = SvPVX (enc->sv) + cur;
69	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv);	141	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
70	}	142	}
71	}	143	}
72		144
73	static void	145	inline void
74	encode_ch (enc_t *enc, char ch)	146	encode_ch (enc_t *enc, char ch)
75	{	147	{
76	need (enc, 1);	148	need (enc, 1);
77	*enc->cur++ = ch;	149	*enc->cur++ = ch;
78	}	150	}
…		…
86		158
87	while (str < end)	159	while (str < end)
88	{	160	{
89	unsigned char ch = *(unsigned char *)str;	161	unsigned char ch = *(unsigned char *)str;
90		162
91	if (ch >= 0x20 && ch < 0x80) // most common case	163	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
92	{	164	{
93	if (ch == '"') // but with slow exceptions	165	if (expect_false (ch == '"')) // but with slow exceptions
94	{	166	{
95	need (enc, len += 1);	167	need (enc, len += 1);
96	*enc->cur++ = '\\';	168	*enc->cur++ = '\\';
97	*enc->cur++ = '"';	169	*enc->cur++ = '"';
98	}	170	}
99	else if (ch == '\\')	171	else if (expect_false (ch == '\\'))
100	{	172	{
101	need (enc, len += 1);	173	need (enc, len += 1);
102	*enc->cur++ = '\\';	174	*enc->cur++ = '\\';
103	*enc->cur++ = '\\';	175	*enc->cur++ = '\\';
104	}	176	}
…		…
122	STRLEN clen;	194	STRLEN clen;
123	UV uch;	195	UV uch;
124		196
125	if (is_utf8)	197	if (is_utf8)
126	{	198	{
127	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);	199	uch = decode_utf8 (str, end - str, &clen);
128	if (clen == (STRLEN)-1)	200	if (clen == (STRLEN)-1)
129	croak ("malformed UTF-8 character in string, cannot convert to JSON");	201	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
130	}	202	}
131	else	203	else
132	{	204	{
133	uch = ch;	205	uch = ch;
134	clen = 1;	206	clen = 1;
135	}	207	}
136		208
137	if (uch < 0x80 || enc->flags & F_ASCII)	209	if (uch > 0x10FFFFUL)
		210	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		211
		212	if (uch < 0x80 || enc->json.flags & F_ASCII || (enc->json.flags & F_LATIN1 && uch > 0xFF))
138	{	213	{
139	if (uch > 0xFFFFUL)	214	if (uch > 0xFFFFUL)
140	{	215	{
141	need (enc, len += 11);	216	need (enc, len += 11);
142	sprintf (enc->cur, "\\u%04x\\u%04x",	217	sprintf (enc->cur, "\\u%04x\\u%04x",
143	(uch - 0x10000) / 0x400 + 0xD800,	218	(int)((uch - 0x10000) / 0x400 + 0xD800),
144	(uch - 0x10000) % 0x400 + 0xDC00);	219	(int)((uch - 0x10000) % 0x400 + 0xDC00));
145	enc->cur += 12;	220	enc->cur += 12;
146	}	221	}
147	else	222	else
148	{	223	{
149	static char hexdigit [16] = "0123456789abcdef";	224	static char hexdigit [16] = "0123456789abcdef";
…		…
156	*enc->cur++ = hexdigit [(uch >> 0) & 15];	231	*enc->cur++ = hexdigit [(uch >> 0) & 15];
157	}	232	}
158		233
159	str += clen;	234	str += clen;
160	}	235	}
		236	else if (enc->json.flags & F_LATIN1)
		237	{
		238	*enc->cur++ = uch;
		239	str += clen;
		240	}
161	else if (is_utf8)	241	else if (is_utf8)
162	{	242	{
163	need (enc, len += clen);	243	need (enc, len += clen);
164	do	244	do
165	{	245	{
…		…
167	}	247	}
168	while (--clen);	248	while (--clen);
169	}	249	}
170	else	250	else
171	{	251	{
172	need (enc, 10); // never more than 11 bytes needed	252	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
173	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);	253	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
174	++str;	254	++str;
175	}	255	}
176	}	256	}
177	}	257	}
…		…
179		259
180	--len;	260	--len;
181	}	261	}
182	}	262	}
183		263
184	#define INDENT SB \	264	inline void
		265	encode_indent (enc_t *enc)
		266	{
185	if (enc->flags & F_INDENT) \	267	if (enc->json.flags & F_INDENT)
186	{ \	268	{
187	int i_; \	269	int spaces = enc->indent * INDENT_STEP;
188	need (enc, enc->indent); \	270
189	for (i_ = enc->indent * 3; i_--; )\	271	need (enc, spaces);
		272	memset (enc->cur, ' ', spaces);
		273	enc->cur += spaces;
		274	}
		275	}
		276
		277	inline void
		278	encode_space (enc_t *enc)
		279	{
		280	need (enc, 1);
		281	encode_ch (enc, ' ');
		282	}
		283
		284	inline void
		285	encode_nl (enc_t *enc)
		286	{
		287	if (enc->json.flags & F_INDENT)
		288	{
		289	need (enc, 1);
190	encode_ch (enc, ' '); \	290	encode_ch (enc, '\n');
191	} \	291	}
192	SE	292	}
193		293
194	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	294	inline void
195	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	295	encode_comma (enc_t *enc)
196	#define COMMA SB \	296	{
197	encode_ch (enc, ','); \	297	encode_ch (enc, ',');
		298
198	if (enc->flags & F_INDENT) \	299	if (enc->json.flags & F_INDENT)
199	NL; \	300	encode_nl (enc);
200	else if (enc->flags & F_SPACE_AFTER) \	301	else if (enc->json.flags & F_SPACE_AFTER)
201	SPACE; \	302	encode_space (enc);
202	SE	303	}
203		304
204	static void encode_sv (enc_t *enc, SV *sv);	305	static void encode_sv (enc_t *enc, SV *sv);
205		306
206	static void	307	static void
207	encode_av (enc_t *enc, AV *av)	308	encode_av (enc_t *enc, AV *av)
208	{	309	{
209	int i, len = av_len (av);	310	int i, len = av_len (av);
210		311
211	encode_ch (enc, '['); NL;	312	if (enc->indent >= enc->maxdepth)
		313	croak ("data structure too deep (hit recursion limit)");
		314
		315	encode_ch (enc, '['); encode_nl (enc);
212	++enc->indent;	316	++enc->indent;
213		317
214	for (i = 0; i <= len; ++i)	318	for (i = 0; i <= len; ++i)
215	{	319	{
216	INDENT;	320	SV **svp = av_fetch (av, i, 0);
217	encode_sv (enc, *av_fetch (av, i, 0));	321
		322	encode_indent (enc);
		323
		324	if (svp)
		325	encode_sv (enc, *svp);
		326	else
		327	encode_str (enc, "null", 4, 0);
218		328
219	if (i < len)	329	if (i < len)
220	COMMA;	330	encode_comma (enc);
221	}	331	}
222		332
223	NL;	333	encode_nl (enc);
224		334
225	--enc->indent;	335	--enc->indent;
226	INDENT; encode_ch (enc, ']');	336	encode_indent (enc); encode_ch (enc, ']');
227	}	337	}
228		338
229	static void	339	static void
230	encode_he (enc_t *enc, HE *he)	340	encode_hk (enc_t *enc, HE *he)
231	{	341	{
232	encode_ch (enc, '"');	342	encode_ch (enc, '"');
233		343
234	if (HeKLEN (he) == HEf_SVKEY)	344	if (HeKLEN (he) == HEf_SVKEY)
235	{	345	{
…		…
245	else	355	else
246	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	356	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
247		357
248	encode_ch (enc, '"');	358	encode_ch (enc, '"');
249		359
250	if (enc->flags & F_SPACE_BEFORE) SPACE;	360	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
251	encode_ch (enc, ':');	361	encode_ch (enc, ':');
252	if (enc->flags & F_SPACE_AFTER ) SPACE;	362	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
253	encode_sv (enc, HeVAL (he));
254	}	363	}
255		364
256	// compare hash entries, used when all keys are bytestrings	365	// compare hash entries, used when all keys are bytestrings
257	static int	366	static int
258	he_cmp_fast (const void *a_, const void *b_)	367	he_cmp_fast (const void *a_, const void *b_)
…		…
263	HE *b = *(HE **)b_;	372	HE *b = *(HE **)b_;
264		373
265	STRLEN la = HeKLEN (a);	374	STRLEN la = HeKLEN (a);
266	STRLEN lb = HeKLEN (b);	375	STRLEN lb = HeKLEN (b);
267		376
268	if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	377	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
269	cmp = la < lb ? -1 : la == lb ? 0 : 1;	378	cmp = lb - la;
270		379
271	return cmp;	380	return cmp;
272	}	381	}
273		382
274	// compare hash entries, used when some keys are sv's or utf-x	383	// compare hash entries, used when some keys are sv's or utf-x
275	static int	384	static int
276	he_cmp_slow (const void *a, const void *b)	385	he_cmp_slow (const void *a, const void *b)
277	{	386	{
278	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	387	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
279	}	388	}
280		389
281	static void	390	static void
282	encode_hv (enc_t *enc, HV *hv)	391	encode_hv (enc_t *enc, HV *hv)
283	{	392	{
		393	HE *he;
284	int count, i;	394	int count;
285		395
		396	if (enc->indent >= enc->maxdepth)
		397	croak ("data structure too deep (hit recursion limit)");
		398
286	encode_ch (enc, '{'); NL; ++enc->indent;	399	encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
287		400
288	if ((count = hv_iterinit (hv)))
289	{
290	// for canonical output we have to sort by keys first	401	// for canonical output we have to sort by keys first
291	// actually, this is mostly due to the stupid so-called	402	// actually, this is mostly due to the stupid so-called
292	// security workaround added somewhere in 5.8.x.	403	// security workaround added somewhere in 5.8.x.
293	// that randomises hash orderings	404	// that randomises hash orderings
294	if (enc->flags & F_CANONICAL)	405	if (enc->json.flags & F_CANONICAL)
		406	{
		407	int count = hv_iterinit (hv);
		408
		409	if (SvMAGICAL (hv))
295	{	410	{
296	HE *he, *hes [count];	411	// need to count by iterating. could improve by dynamically building the vector below
		412	// but I don't care for the speed of this special case.
		413	// note also that we will run into undefined behaviour when the two iterations
		414	// do not result in the same count, something I might care for in some later release.
		415
		416	count = 0;
		417	while (hv_iternext (hv))
		418	++count;
		419
		420	hv_iterinit (hv);
		421	}
		422
		423	if (count)
		424	{
297	int fast = 1;	425	int i, fast = 1;
		426	#if defined(__BORLANDC__) || defined(_MSC_VER)
		427	HE **hes = _alloca (count * sizeof (HE));
		428	#else
		429	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
		430	#endif
298		431
299	i = 0;	432	i = 0;
300	while ((he = hv_iternext (hv)))	433	while ((he = hv_iternext (hv)))
301	{	434	{
302	hes [i++] = he;	435	hes [i++] = he;
…		…
308		441
309	if (fast)	442	if (fast)
310	qsort (hes, count, sizeof (HE *), he_cmp_fast);	443	qsort (hes, count, sizeof (HE *), he_cmp_fast);
311	else	444	else
312	{	445	{
313	// hack to disable "use bytes"	446	// hack to forcefully disable "use bytes"
314	COP *oldcop = PL_curcop, cop;	447	COP cop = *PL_curcop;
315	cop.op_private = 0;	448	cop.op_private = 0;
		449
		450	ENTER;
		451	SAVETMPS;
		452
		453	SAVEVPTR (PL_curcop);
316	PL_curcop = &cop;	454	PL_curcop = &cop;
317		455
318	SAVETMPS;
319	qsort (hes, count, sizeof (HE *), he_cmp_slow);	456	qsort (hes, count, sizeof (HE *), he_cmp_slow);
		457
320	FREETMPS;	458	FREETMPS;
321		459	LEAVE;
322	PL_curcop = oldcop;
323	}
324
325	for (i = 0; i < count; ++i)
326	{	460	}
327	INDENT;
328	encode_he (enc, hes [i]);
329		461
330	if (i < count - 1)	462	while (count--)
331	COMMA;
332	}	463	{
		464	encode_indent (enc);
		465	he = hes [count];
		466	encode_hk (enc, he);
		467	encode_sv (enc, SvMAGICAL (hv) ? hv_iterval (hv, he) : HeVAL (he));
333		468
		469	if (count)
		470	encode_comma (enc);
334	NL;	471	}
		472	}
		473	}
		474	else
		475	{
		476	if (hv_iterinit (hv) || SvMAGICAL (hv))
		477	if ((he = hv_iternext (hv)))
		478	for (;;)
		479	{
		480	encode_indent (enc);
		481	encode_hk (enc, he);
		482	encode_sv (enc, SvMAGICAL (hv) ? hv_iterval (hv, he) : HeVAL (he));
		483
		484	if (!(he = hv_iternext (hv)))
		485	break;
		486
		487	encode_comma (enc);
		488	}
		489	}
		490
		491	encode_nl (enc);
		492
		493	--enc->indent; encode_indent (enc); encode_ch (enc, '}');
		494	}
		495
		496	// encode objects, arrays and special \0=false and \1=true values.
		497	static void
		498	encode_rv (enc_t *enc, SV *sv)
		499	{
		500	svtype svt;
		501
		502	SvGETMAGIC (sv);
		503	svt = SvTYPE (sv);
		504
		505	if (expect_false (SvOBJECT (sv)))
		506	{
		507	HV *stash = !JSON_SLOW || json_boolean_stash
		508	? json_boolean_stash
		509	: gv_stashpv ("JSON::XS::Boolean", 1);
		510
		511	if (SvSTASH (sv) == stash)
		512	{
		513	if (SvIV (sv))
		514	encode_str (enc, "true", 4, 0);
		515	else
		516	encode_str (enc, "false", 5, 0);
335	}	517	}
336	else	518	else
337	{	519	{
338	SV *sv;	520	#if 0
339	HE *he = hv_iternext (hv);	521	if (0 && sv_derived_from (rv, "JSON::Literal"))
340
341	for (;;)
342	{
343	INDENT;
344	encode_he (enc, he);
345
346	if (!(he = hv_iternext (hv)))
347	break;
348
349	COMMA;
350	}	522	{
351		523	// not yet
352	NL;	524	}
		525	#endif
		526	if (enc->json.flags & F_CONV_BLESSED)
		527	{
		528	// we re-bless the reference to get overload and other niceties right
		529	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
		530
		531	if (to_json)
		532	{
		533	dSP;
		534
		535	ENTER; SAVETMPS; PUSHMARK (SP);
		536	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		537
		538	// calling with G_SCALAR ensures that we always get a 1 return value
		539	PUTBACK;
		540	call_sv ((SV *)GvCV (to_json), G_SCALAR);
		541	SPAGAIN;
		542
		543	// catch this surprisingly common error
		544	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		545	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		546
		547	sv = POPs;
		548	PUTBACK;
		549
		550	encode_sv (enc, sv);
		551
		552	FREETMPS; LEAVE;
		553	}
		554	else if (enc->json.flags & F_ALLOW_BLESSED)
		555	encode_str (enc, "null", 4, 0);
		556	else
		557	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		558	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		559	}
		560	else if (enc->json.flags & F_ALLOW_BLESSED)
		561	encode_str (enc, "null", 4, 0);
		562	else
		563	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		564	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
353	}	565	}
354	}	566	}
		567	else if (svt == SVt_PVHV)
		568	encode_hv (enc, (HV *)sv);
		569	else if (svt == SVt_PVAV)
		570	encode_av (enc, (AV *)sv);
		571	else if (svt < SVt_PVAV)
		572	{
		573	STRLEN len = 0;
		574	char *pv = svt ? SvPV (sv, len) : 0;
355		575
356	--enc->indent; INDENT; encode_ch (enc, '}');	576	if (len == 1 && *pv == '1')
		577	encode_str (enc, "true", 4, 0);
		578	else if (len == 1 && *pv == '0')
		579	encode_str (enc, "false", 5, 0);
		580	else
		581	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		582	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		583	}
		584	else
		585	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		586	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
357	}	587	}
358		588
359	static void	589	static void
360	encode_sv (enc_t *enc, SV *sv)	590	encode_sv (enc_t *enc, SV *sv)
361	{	591	{
…		…
369	encode_str (enc, str, len, SvUTF8 (sv));	599	encode_str (enc, str, len, SvUTF8 (sv));
370	encode_ch (enc, '"');	600	encode_ch (enc, '"');
371	}	601	}
372	else if (SvNOKp (sv))	602	else if (SvNOKp (sv))
373	{	603	{
		604	// trust that perl will do the right thing w.r.t. JSON syntax.
374	need (enc, NV_DIG + 32);	605	need (enc, NV_DIG + 32);
375	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	606	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
376	enc->cur += strlen (enc->cur);	607	enc->cur += strlen (enc->cur);
377	}	608	}
378	else if (SvIOKp (sv))	609	else if (SvIOKp (sv))
379	{	610	{
380	need (enc, 64);	611	// we assume we can always read an IV as a UV
		612	if (SvUV (sv) & ~(UV)0x7fff)
		613	{
		614	// large integer, use the (rather slow) snprintf way.
		615	need (enc, sizeof (UV) * 3);
381	enc->cur +=	616	enc->cur +=
382	SvIsUV(sv)	617	SvIsUV(sv)
383	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	618	? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
384	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	619	: snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
		620	}
		621	else
		622	{
		623	// optimise the "small number case"
		624	// code will likely be branchless and use only a single multiplication
		625	I32 i = SvIV (sv);
		626	U32 u;
		627	char digit, nz = 0;
		628
		629	need (enc, 6);
		630
		631	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		632	u = i < 0 ? -i : i;
		633
		634	// convert to 4.28 fixed-point representation
		635	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		636
		637	// now output digit by digit, each time masking out the integer part
		638	// and multiplying by 5 while moving the decimal point one to the right,
		639	// resulting in a net multiplication by 10.
		640	// we always write the digit to memory but conditionally increment
		641	// the pointer, to ease the usage of conditional move instructions.
		642	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
		643	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
		644	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
		645	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
		646	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		647	}
385	}	648	}
386	else if (SvROK (sv))	649	else if (SvROK (sv))
387	{	650	encode_rv (enc, SvRV (sv));
388	if (!--enc->max_recurse)
389	croak ("data structure too deep (hit recursion limit)");
390
391	sv = SvRV (sv);
392
393	switch (SvTYPE (sv))
394	{
395	case SVt_PVAV: encode_av (enc, (AV *)sv); break;
396	case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
397
398	default:
399	croak ("JSON can only represent references to arrays or hashes");
400	}
401	}
402	else if (!SvOK (sv))	651	else if (!SvOK (sv))
403	encode_str (enc, "null", 4, 0);	652	encode_str (enc, "null", 4, 0);
404	else	653	else
405	croak ("encountered perl type that JSON cannot handle");	654	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
		655	SvPV_nolen (sv), SvFLAGS (sv));
406	}	656	}
407		657
408	static SV *	658	static SV *
409	encode_json (SV *scalar, UV flags)	659	encode_json (SV *scalar, JSON *json)
410	{	660	{
411	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))
412	croak ("hash- or arraref required (not a simple scalar, use allow_nonref to allow this)");
413
414	enc_t enc;	661	enc_t enc;
415	enc.flags = flags;	662
		663	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
		664	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
		665
		666	enc.json = *json;
416	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	667	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
417	enc.cur = SvPVX (enc.sv);	668	enc.cur = SvPVX (enc.sv);
418	enc.end = SvEND (enc.sv);	669	enc.end = SvEND (enc.sv);
419	enc.max_recurse = 0;
420	enc.indent = 0;	670	enc.indent = 0;
		671	enc.maxdepth = DEC_DEPTH (enc.json.flags);
421		672
422	SvPOK_only (enc.sv);	673	SvPOK_only (enc.sv);
423	encode_sv (&enc, scalar);	674	encode_sv (&enc, scalar);
424		675
		676	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		677	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		678
425	if (!(flags & (F_ASCII | F_UTF8)))	679	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
426	SvUTF8_on (enc.sv);	680	SvUTF8_on (enc.sv);
427		681
428	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
429
430	#ifdef SvPV_shrink_to_cur
431	if (enc.flags & F_SHRINK)	682	if (enc.json.flags & F_SHRINK)
432	SvPV_shrink_to_cur (enc.sv);	683	shrink (enc.sv);
433	#endif	684
434	return enc.sv;	685	return enc.sv;
435	}	686	}
436		687
437	/////////////////////////////////////////////////////////////////////////////	688	/////////////////////////////////////////////////////////////////////////////
		689	// decoder
438		690
439	#define WS \	691	// structure used for decoding JSON
		692	typedef struct
		693	{
		694	char *cur; // current parser pointer
		695	char *end; // end of input string
		696	const char *err; // parse error, if != 0
		697	JSON json;
		698	U32 depth; // recursion depth
		699	U32 maxdepth; // recursion depth limit
		700	} dec_t;
		701
		702	inline void
		703	decode_ws (dec_t *dec)
		704	{
440	for (;;) \	705	for (;;)
441	{ \	706	{
442	char ch = *dec->cur; \	707	char ch = *dec->cur;
		708
443	if (ch > 0x20 \	709	if (ch > 0x20
444	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	710	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))
445	break; \	711	break;
		712
446	++dec->cur; \	713	++dec->cur;
447	}	714	}
		715	}
448		716
449	#define ERR(reason) SB dec->err = reason; goto fail; SE	717	#define ERR(reason) SB dec->err = reason; goto fail; SE
		718
450	#define EXPECT_CH(ch) SB \	719	#define EXPECT_CH(ch) SB \
451	if (*dec->cur != ch) \	720	if (*dec->cur != ch) \
452	ERR (# ch " expected"); \	721	ERR (# ch " expected"); \
453	++dec->cur; \	722	++dec->cur; \
454	SE	723	SE
455		724
		725	#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
		726	#define DEC_DEC_DEPTH --dec->depth
		727
456	static SV *decode_sv (dec_t *dec);	728	static SV *decode_sv (dec_t *dec);
457		729
458	static signed char decode_hexdigit[256];	730	static signed char decode_hexdigit[256];
459		731
460	static UV	732	static UV
461	decode_4hex (dec_t *dec)	733	decode_4hex (dec_t *dec)
462	{	734	{
463	signed char d1, d2, d3, d4;	735	signed char d1, d2, d3, d4;
		736	unsigned char *cur = (unsigned char *)dec->cur;
464		737
465	d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]];	738	d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
466	if (d1 < 0) ERR ("four hexadecimal digits expected");	739	d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
467	d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]];	740	d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
468	if (d2 < 0) ERR ("four hexadecimal digits expected");	741	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
469	d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
470	if (d3 < 0) ERR ("four hexadecimal digits expected");
471	d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
472	if (d4 < 0) ERR ("four hexadecimal digits expected");
473		742
474	dec->cur += 4;	743	dec->cur += 4;
475		744
476	return ((UV)d1) << 12	745	return ((UV)d1) << 12
477	| ((UV)d2) << 8	746	| ((UV)d2) << 8
…		…
480		749
481	fail:	750	fail:
482	return (UV)-1;	751	return (UV)-1;
483	}	752	}
484		753
485	#define APPEND_GROW(n) SB \
486	if (cur + (n) >= end) \
487	{ \
488	STRLEN ofs = cur - SvPVX (sv); \
489	SvGROW (sv, ofs + (n) + 1); \
490	cur = SvPVX (sv) + ofs; \
491	end = SvEND (sv); \
492	} \
493	SE
494
495	#define APPEND_CH(ch) SB \
496	APPEND_GROW (1); \
497	*cur++ = (ch); \
498	SE
499
500	static SV *	754	static SV *
501	decode_str (dec_t *dec)	755	decode_str (dec_t *dec)
502	{	756	{
503	SV *sv = NEWSV (0,2);	757	SV *sv = 0;
504	int utf8 = 0;	758	int utf8 = 0;
505	char *cur = SvPVX (sv);	759	char *dec_cur = dec->cur;
506	char *end = SvEND (sv);
507		760
508	for (;;)	761	do
509	{	762	{
510	unsigned char ch = *(unsigned char *)dec->cur;	763	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		764	char *cur = buf;
511		765
512	if (ch == '"')	766	do
513	break;
514	else if (ch == '\\')
515	{	767	{
516	switch (*++dec->cur)	768	unsigned char ch = *(unsigned char *)dec_cur++;
		769
		770	if (expect_false (ch == '"'))
		771	{
		772	--dec_cur;
		773	break;
517	{	774	}
518	case '\\':	775	else if (expect_false (ch == '\\'))
519	case '/':	776	{
520	case '"': APPEND_CH (*dec->cur++); break;	777	switch (*dec_cur)
521
522	case 'b': APPEND_CH ('\010'); ++dec->cur; break;
523	case 't': APPEND_CH ('\011'); ++dec->cur; break;
524	case 'n': APPEND_CH ('\012'); ++dec->cur; break;
525	case 'f': APPEND_CH ('\014'); ++dec->cur; break;
526	case 'r': APPEND_CH ('\015'); ++dec->cur; break;
527
528	case 'u':
529	{	778	{
530	UV lo, hi;	779	case '\\':
531	++dec->cur;	780	case '/':
		781	case '"': *cur++ = *dec_cur++; break;
532		782
533	hi = decode_4hex (dec);	783	case 'b': ++dec_cur; *cur++ = '\010'; break;
534	if (hi == (UV)-1)	784	case 't': ++dec_cur; *cur++ = '\011'; break;
535	goto fail;	785	case 'n': ++dec_cur; *cur++ = '\012'; break;
		786	case 'f': ++dec_cur; *cur++ = '\014'; break;
		787	case 'r': ++dec_cur; *cur++ = '\015'; break;
536		788
537	// possibly a surrogate pair	789	case 'u':
538	if (hi >= 0xd800 && hi < 0xdc00)
539	{	790	{
540	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	791	UV lo, hi;
541	ERR ("missing low surrogate character in surrogate pair");	792	++dec_cur;
542		793
543	dec->cur += 2;	794	dec->cur = dec_cur;
544
545	lo = decode_4hex (dec);	795	hi = decode_4hex (dec);
		796	dec_cur = dec->cur;
546	if (lo == (UV)-1)	797	if (hi == (UV)-1)
547	goto fail;	798	goto fail;
548		799
		800	// possibly a surrogate pair
		801	if (hi >= 0xd800)
		802	if (hi < 0xdc00)
		803	{
		804	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
		805	ERR ("missing low surrogate character in surrogate pair");
		806
		807	dec_cur += 2;
		808
		809	dec->cur = dec_cur;
		810	lo = decode_4hex (dec);
		811	dec_cur = dec->cur;
		812	if (lo == (UV)-1)
		813	goto fail;
		814
549	if (lo < 0xdc00 || lo >= 0xe000)	815	if (lo < 0xdc00 || lo >= 0xe000)
550	ERR ("surrogate pair expected");	816	ERR ("surrogate pair expected");
551		817
552	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;	818	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
		819	}
		820	else if (hi < 0xe000)
		821	ERR ("missing high surrogate character in surrogate pair");
		822
		823	if (hi >= 0x80)
		824	{
		825	utf8 = 1;
		826
		827	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
		828	}
		829	else
		830	*cur++ = hi;
553	}	831	}
554	else if (hi >= 0xdc00 && hi < 0xe000)
555	ERR ("missing high surrogate character in surrogate pair");
556
557	if (hi >= 0x80)
558	{	832	break;
559	utf8 = 1;
560		833
561	APPEND_GROW (4); // at most 4 bytes for 21 bits
562	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
563	}
564	else	834	default:
565	APPEND_CH (hi);	835	--dec_cur;
		836	ERR ("illegal backslash escape sequence in string");
566	}	837	}
567	break;	838	}
		839	else if (expect_true (ch >= 0x20 && ch <= 0x7f))
		840	*cur++ = ch;
		841	else if (ch >= 0x80)
		842	{
		843	STRLEN clen;
		844	UV uch;
568		845
569	default:
570	--dec->cur;	846	--dec_cur;
571	ERR ("illegal backslash escape sequence in string");	847
		848	uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		849	if (clen == (STRLEN)-1)
		850	ERR ("malformed UTF-8 character in JSON string");
		851
		852	do
		853	*cur++ = *dec_cur++;
		854	while (--clen);
		855
		856	utf8 = 1;
		857	}
		858	else
		859	{
		860	--dec_cur;
		861
		862	if (!ch)
		863	ERR ("unexpected end of string while parsing JSON string");
		864	else
		865	ERR ("invalid character encountered while parsing JSON string");
572	}	866	}
573	}	867	}
574	else if (ch >= 0x20 && ch <= 0x7f)	868	while (cur < buf + SHORT_STRING_LEN);
575	APPEND_CH (*dec->cur++);	869
576	else if (ch >= 0x80)
577	{	870	{
578	STRLEN clen;	871	STRLEN len = cur - buf;
579	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
580	if (clen == (STRLEN)-1)
581	ERR ("malformed UTF-8 character in string, cannot convert to JSON");
582		872
583	APPEND_GROW (clen);	873	if (sv)
584	do
585	{	874	{
586	*cur++ = *dec->cur++;	875	SvGROW (sv, SvCUR (sv) + len + 1);
		876	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
		877	SvCUR_set (sv, SvCUR (sv) + len);
587	}	878	}
588	while (--clen);
589
590	utf8 = 1;
591	}
592	else if (dec->cur == dec->end)
593	ERR ("unexpected end of string while parsing json string");
594	else	879	else
595	ERR ("invalid character encountered");	880	sv = newSVpvn (buf, len);
596	}	881	}
		882	}
		883	while (*dec_cur != '"');
597		884
598	++dec->cur;	885	++dec_cur;
599		886
600	SvCUR_set (sv, cur - SvPVX (sv));	887	if (sv)
601		888	{
602	SvPOK_only (sv);	889	SvPOK_only (sv);
603	*SvEND (sv) = 0;	890	*SvEND (sv) = 0;
604		891
605	if (utf8)	892	if (utf8)
606	SvUTF8_on (sv);	893	SvUTF8_on (sv);
		894	}
		895	else
		896	sv = newSVpvn ("", 0);
607		897
608	#ifdef SvPV_shrink_to_cur	898	dec->cur = dec_cur;
609	if (dec->flags & F_SHRINK)
610	SvPV_shrink_to_cur (sv);
611	#endif
612
613	return sv;	899	return sv;
614		900
615	fail:	901	fail:
616	SvREFCNT_dec (sv);	902	dec->cur = dec_cur;
617	return 0;	903	return 0;
618	}	904	}
619		905
620	static SV *	906	static SV *
621	decode_num (dec_t *dec)	907	decode_num (dec_t *dec)
…		…
679	is_nv = 1;	965	is_nv = 1;
680	}	966	}
681		967
682	if (!is_nv)	968	if (!is_nv)
683	{	969	{
684	UV uv;	970	int len = dec->cur - start;
685	int numtype = grok_number (start, dec->cur - start, &uv);	971
686	if (numtype & IS_NUMBER_IN_UV)	972	// special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
687	if (numtype & IS_NUMBER_NEG)	973	if (*start == '-')
		974	switch (len)
688	{	975	{
689	if (uv < (UV)IV_MIN)	976	case 2: return newSViv (-( start [1] - '0' * 1));
690	return newSViv (-(IV)uv);	977	case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
		978	case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		979	case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
691	}	980	}
		981	else
		982	switch (len)
		983	{
		984	case 1: return newSViv ( start [0] - '0' * 1);
		985	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		986	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		987	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		988	}
		989
		990	{
		991	UV uv;
		992	int numtype = grok_number (start, len, &uv);
		993	if (numtype & IS_NUMBER_IN_UV)
		994	if (numtype & IS_NUMBER_NEG)
		995	{
		996	if (uv < (UV)IV_MIN)
		997	return newSViv (-(IV)uv);
		998	}
692	else	999	else
693	return newSVuv (uv);	1000	return newSVuv (uv);
694	}	1001	}
695		1002
		1003	len -= *start == '-' ? 1 : 0;
		1004
		1005	// does not fit into IV or UV, try NV
		1006	if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len)
		1007	#if defined (LDBL_DIG)
		1008	|| (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len)
		1009	#endif
		1010	)
		1011	// fits into NV without loss of precision
		1012	return newSVnv (Atof (start));
		1013
		1014	// everything else fails, convert it to a string
		1015	return newSVpvn (start, dec->cur - start);
		1016	}
		1017
		1018	// loss of precision here
696	return newSVnv (Atof (start));	1019	return newSVnv (Atof (start));
697		1020
698	fail:	1021	fail:
699	return 0;	1022	return 0;
700	}	1023	}
…		…
702	static SV *	1025	static SV *
703	decode_av (dec_t *dec)	1026	decode_av (dec_t *dec)
704	{	1027	{
705	AV *av = newAV ();	1028	AV *av = newAV ();
706		1029
707	WS;	1030	DEC_INC_DEPTH;
		1031	decode_ws (dec);
		1032
708	if (*dec->cur == ']')	1033	if (*dec->cur == ']')
709	++dec->cur;	1034	++dec->cur;
710	else	1035	else
711	for (;;)	1036	for (;;)
712	{	1037	{
…		…
716	if (!value)	1041	if (!value)
717	goto fail;	1042	goto fail;
718		1043
719	av_push (av, value);	1044	av_push (av, value);
720		1045
721	WS;	1046	decode_ws (dec);
722		1047
723	if (*dec->cur == ']')	1048	if (*dec->cur == ']')
724	{	1049	{
725	++dec->cur;	1050	++dec->cur;
726	break;	1051	break;
…		…
730	ERR (", or ] expected while parsing array");	1055	ERR (", or ] expected while parsing array");
731		1056
732	++dec->cur;	1057	++dec->cur;
733	}	1058	}
734		1059
		1060	DEC_DEC_DEPTH;
735	return newRV_noinc ((SV *)av);	1061	return newRV_noinc ((SV *)av);
736		1062
737	fail:	1063	fail:
738	SvREFCNT_dec (av);	1064	SvREFCNT_dec (av);
		1065	DEC_DEC_DEPTH;
739	return 0;	1066	return 0;
740	}	1067	}
741		1068
742	static SV *	1069	static SV *
743	decode_hv (dec_t *dec)	1070	decode_hv (dec_t *dec)
744	{	1071	{
		1072	SV *sv;
745	HV *hv = newHV ();	1073	HV *hv = newHV ();
746		1074
747	WS;	1075	DEC_INC_DEPTH;
		1076	decode_ws (dec);
		1077
748	if (*dec->cur == '}')	1078	if (*dec->cur == '}')
749	++dec->cur;	1079	++dec->cur;
750	else	1080	else
751	for (;;)	1081	for (;;)
752	{	1082	{
		1083	decode_ws (dec); EXPECT_CH ('"');
		1084
		1085	// heuristic: assume that
		1086	// a) decode_str + hv_store_ent are abysmally slow.
		1087	// b) most hash keys are short, simple ascii text.
		1088	// => try to "fast-match" such strings to avoid
		1089	// the overhead of decode_str + hv_store_ent.
		1090	{
753	SV *key, *value;	1091	SV *value;
		1092	char *p = dec->cur;
		1093	char *e = p + 24; // only try up to 24 bytes
754		1094
755	WS; EXPECT_CH ('"');	1095	for (;;)
756
757	key = decode_str (dec);
758	if (!key)
759	goto fail;
760
761	WS; EXPECT_CH (':');
762
763	value = decode_sv (dec);
764	if (!value)
765	{	1096	{
		1097	// the >= 0x80 is true on most architectures
		1098	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1099	{
		1100	// slow path, back up and use decode_str
		1101	SV *key = decode_str (dec);
		1102	if (!key)
		1103	goto fail;
		1104
		1105	decode_ws (dec); EXPECT_CH (':');
		1106
		1107	value = decode_sv (dec);
		1108	if (!value)
		1109	{
		1110	SvREFCNT_dec (key);
		1111	goto fail;
		1112	}
		1113
		1114	hv_store_ent (hv, key, value, 0);
766	SvREFCNT_dec (key);	1115	SvREFCNT_dec (key);
		1116
		1117	break;
		1118	}
		1119	else if (*p == '"')
		1120	{
		1121	// fast path, got a simple key
		1122	char *key = dec->cur;
		1123	int len = p - key;
		1124	dec->cur = p + 1;
		1125
		1126	decode_ws (dec); EXPECT_CH (':');
		1127
		1128	value = decode_sv (dec);
		1129	if (!value)
767	goto fail;	1130	goto fail;
		1131
		1132	hv_store (hv, key, len, value, 0);
		1133
		1134	break;
		1135	}
		1136
		1137	++p;
768	}	1138	}
769
770	//TODO: optimise
771	hv_store_ent (hv, key, value, 0);
772
773	WS;	1139	}
		1140
		1141	decode_ws (dec);
774		1142
775	if (*dec->cur == '}')	1143	if (*dec->cur == '}')
776	{	1144	{
777	++dec->cur;	1145	++dec->cur;
778	break;	1146	break;
…		…
782	ERR (", or } expected while parsing object/hash");	1150	ERR (", or } expected while parsing object/hash");
783		1151
784	++dec->cur;	1152	++dec->cur;
785	}	1153	}
786		1154
		1155	DEC_DEC_DEPTH;
787	return newRV_noinc ((SV *)hv);	1156	sv = newRV_noinc ((SV *)hv);
		1157
		1158	// check filter callbacks
		1159	if (dec->json.flags & F_HOOK)
		1160	{
		1161	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1162	{
		1163	HE *cb, *he;
		1164
		1165	hv_iterinit (hv);
		1166	he = hv_iternext (hv);
		1167	hv_iterinit (hv);
		1168
		1169	// the next line creates a mortal sv each time its called.
		1170	// might want to optimise this for common cases.
		1171	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1172
		1173	if (cb)
		1174	{
		1175	dSP;
		1176	int count;
		1177
		1178	ENTER; SAVETMPS; PUSHMARK (SP);
		1179	XPUSHs (HeVAL (he));
		1180
		1181	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1182
		1183	if (count == 1)
		1184	{
		1185	sv = newSVsv (POPs);
		1186	FREETMPS; LEAVE;
		1187	return sv;
		1188	}
		1189
		1190	FREETMPS; LEAVE;
		1191	}
		1192	}
		1193
		1194	if (dec->json.cb_object)
		1195	{
		1196	dSP;
		1197	int count;
		1198
		1199	ENTER; SAVETMPS; PUSHMARK (SP);
		1200	XPUSHs (sv_2mortal (sv));
		1201
		1202	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1203
		1204	if (count == 1)
		1205	{
		1206	sv = newSVsv (POPs);
		1207	FREETMPS; LEAVE;
		1208	return sv;
		1209	}
		1210
		1211	SvREFCNT_inc (sv);
		1212	FREETMPS; LEAVE;
		1213	}
		1214	}
		1215
		1216	return sv;
788		1217
789	fail:	1218	fail:
790	SvREFCNT_dec (hv);	1219	SvREFCNT_dec (hv);
		1220	DEC_DEC_DEPTH;
791	return 0;	1221	return 0;
792	}	1222	}
793		1223
794	static SV *	1224	static SV *
795	decode_sv (dec_t *dec)	1225	decode_sv (dec_t *dec)
796	{	1226	{
797	WS;	1227	decode_ws (dec);
		1228
		1229	// the beauty of JSON: you need exactly one character lookahead
		1230	// to parse anything.
798	switch (*dec->cur)	1231	switch (*dec->cur)
799	{	1232	{
800	case '"': ++dec->cur; return decode_str (dec);	1233	case '"': ++dec->cur; return decode_str (dec);
801	case '[': ++dec->cur; return decode_av (dec);	1234	case '[': ++dec->cur; return decode_av (dec);
802	case '{': ++dec->cur; return decode_hv (dec);	1235	case '{': ++dec->cur; return decode_hv (dec);
…		…
808		1241
809	case 't':	1242	case 't':
810	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1243	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
811	{	1244	{
812	dec->cur += 4;	1245	dec->cur += 4;
813	return newSViv (1);	1246	#if JSON_SLOW
		1247	json_true = get_sv ("JSON::XS::true", 1); SvREADONLY_on (json_true);
		1248	#endif
		1249	return SvREFCNT_inc (json_true);
814	}	1250	}
815	else	1251	else
816	ERR ("'true' expected");	1252	ERR ("'true' expected");
817		1253
818	break;	1254	break;
819		1255
820	case 'f':	1256	case 'f':
821	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1257	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
822	{	1258	{
823	dec->cur += 5;	1259	dec->cur += 5;
824	return newSViv (0);	1260	#if JSON_SLOW
		1261	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1262	#endif
		1263	return SvREFCNT_inc (json_false);
825	}	1264	}
826	else	1265	else
827	ERR ("'false' expected");	1266	ERR ("'false' expected");
828		1267
829	break;	1268	break;
…		…
838	ERR ("'null' expected");	1277	ERR ("'null' expected");
839		1278
840	break;	1279	break;
841		1280
842	default:	1281	default:
843	ERR ("malformed json string");	1282	ERR ("malformed JSON string, neither array, object, number, string or atom");
844	break;	1283	break;
845	}	1284	}
846		1285
847	fail:	1286	fail:
848	return 0;	1287	return 0;
849	}	1288	}
850		1289
851	static SV *	1290	static SV *
852	decode_json (SV *string, UV flags)	1291	decode_json (SV *string, JSON *json, UV *offset_return)
853	{	1292	{
		1293	dec_t dec;
		1294	UV offset;
854	SV *sv;	1295	SV *sv;
855		1296
		1297	SvGETMAGIC (string);
		1298	SvUPGRADE (string, SVt_PV);
		1299
		1300	if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
		1301	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1302	(unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
		1303
856	if (flags & F_UTF8)	1304	if (json->flags & F_UTF8)
857	sv_utf8_downgrade (string, 0);	1305	sv_utf8_downgrade (string, 0);
858	else	1306	else
859	sv_utf8_upgrade (string);	1307	sv_utf8_upgrade (string);
860		1308
861	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1309	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
862		1310
863	dec_t dec;	1311	dec.json = *json;
864	dec.flags = flags;
865	dec.cur = SvPVX (string);	1312	dec.cur = SvPVX (string);
866	dec.end = SvEND (string);	1313	dec.end = SvEND (string);
867	dec.err = 0;	1314	dec.err = 0;
		1315	dec.depth = 0;
		1316	dec.maxdepth = DEC_DEPTH (dec.json.flags);
868		1317
		1318	if (dec.json.cb_object || dec.json.cb_sk_object)
		1319	dec.json.flags |= F_HOOK;
		1320
		1321	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
869	sv = decode_sv (&dec);	1322	sv = decode_sv (&dec);
870		1323
		1324	if (!(offset_return || !sv))
		1325	{
		1326	// check for trailing garbage
		1327	decode_ws (&dec);
		1328
		1329	if (*dec.cur)
		1330	{
		1331	dec.err = "garbage after JSON object";
		1332	SvREFCNT_dec (sv);
		1333	sv = 0;
		1334	}
		1335	}
		1336
		1337	if (offset_return || !sv)
		1338	{
		1339	offset = dec.json.flags & F_UTF8
		1340	? dec.cur - SvPVX (string)
		1341	: utf8_distance (dec.cur, SvPVX (string));
		1342
		1343	if (offset_return)
		1344	*offset_return = offset;
		1345	}
		1346
871	if (!sv)	1347	if (!sv)
872	{	1348	{
873	IV offset = utf8_distance (dec.cur, SvPVX (string));
874	SV *uni = sv_newmortal ();	1349	SV *uni = sv_newmortal ();
		1350
875	// horrible hack to silence warning inside pv_uni_display	1351	// horrible hack to silence warning inside pv_uni_display
876	COP cop;	1352	COP cop = *PL_curcop;
877	memset (&cop, 0, sizeof (cop));
878	cop.cop_warnings = pWARN_NONE;	1353	cop.cop_warnings = pWARN_NONE;
		1354	ENTER;
879	SAVEVPTR (PL_curcop);	1355	SAVEVPTR (PL_curcop);
880	PL_curcop = &cop;	1356	PL_curcop = &cop;
881
882	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1357	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
		1358	LEAVE;
		1359
883	croak ("%s, at character offset %d (%s)",	1360	croak ("%s, at character offset %d [\"%s\"]",
884	dec.err,	1361	dec.err,
885	(int)offset,	1362	(int)offset,
886	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1363	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
887	}	1364	}
888		1365
889	sv = sv_2mortal (sv);	1366	sv = sv_2mortal (sv);
890		1367
891	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1368	if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
892	croak ("JSON object or array expected (but number, string, true, false or null found, use allow_nonref to allow this)");	1369	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
893		1370
894	return sv;	1371	return sv;
895	}	1372	}
896		1373
		1374	/////////////////////////////////////////////////////////////////////////////
		1375	// XS interface functions
		1376
897	MODULE = JSON::XS PACKAGE = JSON::XS	1377	MODULE = JSON::XS PACKAGE = JSON::XS
898		1378
899	BOOT:	1379	BOOT:
900	{	1380	{
901	int i;	1381	int i;
902		1382
903	memset (decode_hexdigit, 0xff, 256);
904	for (i = 10; i--; )	1383	for (i = 0; i < 256; ++i)
905	decode_hexdigit ['0' + i] = i;	1384	decode_hexdigit [i] =
		1385	i >= '0' && i <= '9' ? i - '0'
		1386	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1387	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1388	: -1;
906		1389
907	for (i = 7; i--; )	1390	json_stash = gv_stashpv ("JSON::XS" , 1);
		1391	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1392
		1393	json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
		1394	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1395	}
		1396
		1397	PROTOTYPES: DISABLE
		1398
		1399	void CLONE (...)
		1400	CODE:
		1401	json_stash = 0;
		1402	json_boolean_stash = 0;
		1403
		1404	void new (char *klass)
		1405	PPCODE:
		1406	{
		1407	SV *pv = NEWSV (0, sizeof (JSON));
		1408	SvPOK_only (pv);
		1409	Zero (SvPVX (pv), 1, JSON);
		1410	((JSON *)SvPVX (pv))->flags = F_DEFAULT;
		1411	XPUSHs (sv_2mortal (sv_bless (newRV_noinc (pv), JSON_STASH)));
		1412	}
		1413
		1414	void ascii (JSON *self, int enable = 1)
		1415	ALIAS:
		1416	ascii = F_ASCII
		1417	latin1 = F_LATIN1
		1418	utf8 = F_UTF8
		1419	indent = F_INDENT
		1420	canonical = F_CANONICAL
		1421	space_before = F_SPACE_BEFORE
		1422	space_after = F_SPACE_AFTER
		1423	pretty = F_PRETTY
		1424	allow_nonref = F_ALLOW_NONREF
		1425	shrink = F_SHRINK
		1426	allow_blessed = F_ALLOW_BLESSED
		1427	convert_blessed = F_CONV_BLESSED
		1428	PPCODE:
		1429	{
		1430	if (enable)
		1431	self->flags |= ix;
		1432	else
		1433	self->flags &= ~ix;
		1434
		1435	XPUSHs (ST (0));
		1436	}
		1437
		1438	void max_depth (JSON *self, UV max_depth = 0x80000000UL)
		1439	PPCODE:
		1440	{
		1441	UV log2 = 0;
		1442
		1443	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
		1444
		1445	while ((1UL << log2) < max_depth)
		1446	++log2;
		1447
		1448	self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
		1449
		1450	XPUSHs (ST (0));
		1451	}
		1452
		1453	void max_size (JSON *self, UV max_size = 0)
		1454	PPCODE:
		1455	{
		1456	UV log2 = 0;
		1457
		1458	if (max_size > 0x80000000UL) max_size = 0x80000000UL;
		1459	if (max_size == 1) max_size = 2;
		1460
		1461	while ((1UL << log2) < max_size)
		1462	++log2;
		1463
		1464	self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
		1465
		1466	XPUSHs (ST (0));
		1467	}
		1468
		1469	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
		1470	PPCODE:
		1471	{
		1472	SvREFCNT_dec (self->cb_object);
		1473	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
		1474
		1475	XPUSHs (ST (0));
		1476	}
		1477
		1478	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
		1479	PPCODE:
		1480	{
		1481	if (!self->cb_sk_object)
		1482	self->cb_sk_object = newHV ();
		1483
		1484	if (SvOK (cb))
		1485	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1486	else
908	{	1487	{
909	decode_hexdigit ['a' + i] = 10 + i;	1488	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
910	decode_hexdigit ['A' + i] = 10 + i;	1489
		1490	if (!HvKEYS (self->cb_sk_object))
		1491	{
		1492	SvREFCNT_dec (self->cb_sk_object);
		1493	self->cb_sk_object = 0;
		1494	}
911	}	1495	}
912		1496
913	json_stash = gv_stashpv ("JSON::XS", 1);	1497	XPUSHs (ST (0));
914	}	1498	}
915		1499
916	PROTOTYPES: DISABLE	1500	void encode (JSON *self, SV *scalar)
		1501	PPCODE:
		1502	XPUSHs (encode_json (scalar, self));
917		1503
918	SV *new (char *dummy)	1504	void decode (JSON *self, SV *jsonstr)
		1505	PPCODE:
		1506	XPUSHs (decode_json (jsonstr, self, 0));
		1507
		1508	void decode_prefix (JSON *self, SV *jsonstr)
		1509	PPCODE:
		1510	{
		1511	UV offset;
		1512	EXTEND (SP, 2);
		1513	PUSHs (decode_json (jsonstr, self, &offset));
		1514	PUSHs (sv_2mortal (newSVuv (offset)));
		1515	}
		1516
		1517	void DESTROY (JSON *self)
919	CODE:	1518	CODE:
920	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1519	SvREFCNT_dec (self->cb_sk_object);
921	OUTPUT:	1520	SvREFCNT_dec (self->cb_object);
922	RETVAL
923
924	SV *ascii (SV *self, int enable = 1)
925	ALIAS:
926	ascii = F_ASCII
927	utf8 = F_UTF8
928	indent = F_INDENT
929	canonical = F_CANONICAL
930	space_before = F_SPACE_BEFORE
931	space_after = F_SPACE_AFTER
932	json_rpc = F_JSON_RPC
933	pretty = F_PRETTY
934	allow_nonref = F_ALLOW_NONREF
935	shrink = F_SHRINK
936	CODE:
937	{
938	UV *uv = SvJSON (self);
939	if (enable)
940	*uv |= ix;
941	else
942	*uv &= ~ix;
943
944	RETVAL = newSVsv (self);
945	}
946	OUTPUT:
947	RETVAL
948
949	void encode (SV *self, SV *scalar)
950	PPCODE:
951	XPUSHs (encode_json (scalar, *SvJSON (self)));
952
953	void decode (SV *self, SV *jsonstr)
954	PPCODE:
955	XPUSHs (decode_json (jsonstr, *SvJSON (self)));
956		1521
957	PROTOTYPES: ENABLE	1522	PROTOTYPES: ENABLE
958		1523
959	void to_json (SV *scalar)	1524	void to_json (SV *scalar)
960	PPCODE:	1525	PPCODE:
		1526	{
		1527	JSON json = { F_DEFAULT | F_UTF8 };
961	XPUSHs (encode_json (scalar, F_UTF8));	1528	XPUSHs (encode_json (scalar, &json));
		1529	}
962		1530
963	void from_json (SV *jsonstr)	1531	void from_json (SV *jsonstr)
964	PPCODE:	1532	PPCODE:
		1533	{
		1534	JSON json = { F_DEFAULT | F_UTF8 };
965	XPUSHs (decode_json (jsonstr, F_UTF8));	1535	XPUSHs (decode_json (jsonstr, &json, 0));
		1536	}
966		1537

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