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Comparing JSON-XS/XS.xs (file contents):
Revision 1.7 by root, Fri Mar 23 15:57:18 2007 UTC vs.
Revision 1.64 by root, Mon Aug 27 02:03:23 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_RELAXED 0x00001000UL
		33
		34	#define F_MAXDEPTH 0xf8000000UL
		35	#define S_MAXDEPTH 27
		36	#define F_MAXSIZE 0x01f00000UL
		37	#define S_MAXSIZE 20
		38	#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
		39
		40	#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
		41	#define DEC_SIZE(flags) (1UL << ((flags & F_MAXSIZE ) >> S_MAXSIZE ))
18		42
19	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	43	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
20	#define F_DEFAULT 0	44	#define F_DEFAULT (9UL << S_MAXDEPTH)
21		45
22	#define INIT_SIZE 32 // initial scalar size to be allocated	46	#define INIT_SIZE 32 // initial scalar size to be allocated
		47	#define INDENT_STEP 3 // spaces per indentation level
		48
		49	#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
23		50
24	#define SB do {	51	#define SB do {
25	#define SE } while (0)	52	#define SE } while (0)
26		53
27	static HV *json_stash;	54	#if __GNUC__ >= 3
		55	# define expect(expr,value) __builtin_expect ((expr),(value))
		56	# define inline inline
		57	#else
		58	# define expect(expr,value) (expr)
		59	# define inline static
		60	#endif
		61
		62	#define expect_false(expr) expect ((expr) != 0, 0)
		63	#define expect_true(expr) expect ((expr) != 0, 1)
		64
		65	#ifdef USE_ITHREADS
		66	# define JSON_SLOW 1
		67	# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
		68	#else
		69	# define JSON_SLOW 0
		70	# define JSON_STASH json_stash
		71	#endif
		72
		73	static HV *json_stash, *json_boolean_stash; // JSON::XS::
		74	static SV *json_true, *json_false;
		75
		76	typedef struct {
		77	U32 flags;
		78	SV *cb_object;
		79	HV *cb_sk_object;
		80	} JSON;
		81
		82	/////////////////////////////////////////////////////////////////////////////
		83	// utility functions
		84
		85	inline void
		86	shrink (SV *sv)
		87	{
		88	sv_utf8_downgrade (sv, 1);
		89	if (SvLEN (sv) > SvCUR (sv) + 1)
		90	{
		91	#ifdef SvPV_shrink_to_cur
		92	SvPV_shrink_to_cur (sv);
		93	#elif defined (SvPV_renew)
		94	SvPV_renew (sv, SvCUR (sv) + 1);
		95	#endif
		96	}
		97	}
		98
		99	// decode an utf-8 character and return it, or (UV)-1 in
		100	// case of an error.
		101	// we special-case "safe" characters from U+80 .. U+7FF,
		102	// but use the very good perl function to parse anything else.
		103	// note that we never call this function for a ascii codepoints
		104	inline UV
		105	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
		106	{
		107	if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
		108	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		109	else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
		110	{
		111	*clen = 2;
		112	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
		113	}
		114	else
		115	{
		116	*clen = (STRLEN)-1;
		117	return (UV)-1;
		118	}
		119	}
		120
		121	/////////////////////////////////////////////////////////////////////////////
		122	// encoder
28		123
29	// structure used for encoding JSON	124	// structure used for encoding JSON
30	typedef struct	125	typedef struct
31	{	126	{
32	char *cur;	127	char *cur; // SvPVX (sv) + current output position
33	STRLEN len; // SvLEN (sv)
34	char *end; // SvEND (sv)	128	char *end; // SvEND (sv)
35	SV *sv;	129	SV *sv; // result scalar
36	UV flags;	130	JSON json;
37	int max_recurse;	131	U32 indent; // indentation level
38	int indent;	132	U32 maxdepth; // max. indentation/recursion level
39	} enc_t;	133	} enc_t;
40		134
41	// structure used for decoding JSON	135	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	static void
60	shrink (SV *sv)
61	{
62	sv_utf8_downgrade (sv, 1);
63	#ifdef SvPV_shrink_to_cur
64	SvPV_shrink_to_cur (sv);
65	#endif
66	}
67
68	/////////////////////////////////////////////////////////////////////////////
69
70	static void
71	need (enc_t *enc, STRLEN len)	136	need (enc_t *enc, STRLEN len)
72	{	137	{
73	if (enc->cur + len >= enc->end)	138	if (expect_false (enc->cur + len >= enc->end))
74	{	139	{
75	STRLEN cur = enc->cur - SvPVX (enc->sv);	140	STRLEN cur = enc->cur - SvPVX (enc->sv);
76	SvGROW (enc->sv, cur + len + 1);	141	SvGROW (enc->sv, cur + len + 1);
77	enc->cur = SvPVX (enc->sv) + cur;	142	enc->cur = SvPVX (enc->sv) + cur;
78	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv);	143	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
79	}	144	}
80	}	145	}
81		146
82	static void	147	inline void
83	encode_ch (enc_t *enc, char ch)	148	encode_ch (enc_t *enc, char ch)
84	{	149	{
85	need (enc, 1);	150	need (enc, 1);
86	*enc->cur++ = ch;	151	*enc->cur++ = ch;
87	}	152	}
…		…
95		160
96	while (str < end)	161	while (str < end)
97	{	162	{
98	unsigned char ch = *(unsigned char *)str;	163	unsigned char ch = *(unsigned char *)str;
99		164
100	if (ch >= 0x20 && ch < 0x80) // most common case	165	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
101	{	166	{
102	if (ch == '"') // but with slow exceptions	167	if (expect_false (ch == '"')) // but with slow exceptions
103	{	168	{
104	need (enc, len += 1);	169	need (enc, len += 1);
105	*enc->cur++ = '\\';	170	*enc->cur++ = '\\';
106	*enc->cur++ = '"';	171	*enc->cur++ = '"';
107	}	172	}
108	else if (ch == '\\')	173	else if (expect_false (ch == '\\'))
109	{	174	{
110	need (enc, len += 1);	175	need (enc, len += 1);
111	*enc->cur++ = '\\';	176	*enc->cur++ = '\\';
112	*enc->cur++ = '\\';	177	*enc->cur++ = '\\';
113	}	178	}
…		…
131	STRLEN clen;	196	STRLEN clen;
132	UV uch;	197	UV uch;
133		198
134	if (is_utf8)	199	if (is_utf8)
135	{	200	{
136	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);	201	uch = decode_utf8 (str, end - str, &clen);
137	if (clen == (STRLEN)-1)	202	if (clen == (STRLEN)-1)
138	croak ("malformed UTF-8 character in string, cannot convert to JSON");	203	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
139	}	204	}
140	else	205	else
141	{	206	{
142	uch = ch;	207	uch = ch;
143	clen = 1;	208	clen = 1;
144	}	209	}
145		210
146	if (uch < 0x80 || enc->flags & F_ASCII)	211	if (uch > 0x10FFFFUL)
		212	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		213
		214	if (uch < 0x80 || enc->json.flags & F_ASCII || (enc->json.flags & F_LATIN1 && uch > 0xFF))
147	{	215	{
148	if (uch > 0xFFFFUL)	216	if (uch > 0xFFFFUL)
149	{	217	{
150	need (enc, len += 11);	218	need (enc, len += 11);
151	sprintf (enc->cur, "\\u%04x\\u%04x",	219	sprintf (enc->cur, "\\u%04x\\u%04x",
152	(uch - 0x10000) / 0x400 + 0xD800,	220	(int)((uch - 0x10000) / 0x400 + 0xD800),
153	(uch - 0x10000) % 0x400 + 0xDC00);	221	(int)((uch - 0x10000) % 0x400 + 0xDC00));
154	enc->cur += 12;	222	enc->cur += 12;
155	}	223	}
156	else	224	else
157	{	225	{
158	static char hexdigit [16] = "0123456789abcdef";	226	static char hexdigit [16] = "0123456789abcdef";
…		…
165	*enc->cur++ = hexdigit [(uch >> 0) & 15];	233	*enc->cur++ = hexdigit [(uch >> 0) & 15];
166	}	234	}
167		235
168	str += clen;	236	str += clen;
169	}	237	}
		238	else if (enc->json.flags & F_LATIN1)
		239	{
		240	*enc->cur++ = uch;
		241	str += clen;
		242	}
170	else if (is_utf8)	243	else if (is_utf8)
171	{	244	{
172	need (enc, len += clen);	245	need (enc, len += clen);
173	do	246	do
174	{	247	{
…		…
176	}	249	}
177	while (--clen);	250	while (--clen);
178	}	251	}
179	else	252	else
180	{	253	{
181	need (enc, len += 10); // never more than 11 bytes needed	254	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
182	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);	255	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
183	++str;	256	++str;
184	}	257	}
185	}	258	}
186	}	259	}
…		…
188		261
189	--len;	262	--len;
190	}	263	}
191	}	264	}
192		265
193	#define INDENT SB \	266	inline void
		267	encode_indent (enc_t *enc)
		268	{
194	if (enc->flags & F_INDENT) \	269	if (enc->json.flags & F_INDENT)
195	{ \	270	{
196	int i_; \	271	int spaces = enc->indent * INDENT_STEP;
197	need (enc, enc->indent); \	272
198	for (i_ = enc->indent * 3; i_--; )\	273	need (enc, spaces);
		274	memset (enc->cur, ' ', spaces);
		275	enc->cur += spaces;
		276	}
		277	}
		278
		279	inline void
		280	encode_space (enc_t *enc)
		281	{
		282	need (enc, 1);
		283	encode_ch (enc, ' ');
		284	}
		285
		286	inline void
		287	encode_nl (enc_t *enc)
		288	{
		289	if (enc->json.flags & F_INDENT)
		290	{
		291	need (enc, 1);
199	encode_ch (enc, ' '); \	292	encode_ch (enc, '\n');
200	} \	293	}
201	SE	294	}
202		295
203	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	296	inline void
204	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	297	encode_comma (enc_t *enc)
205	#define COMMA SB \	298	{
206	encode_ch (enc, ','); \	299	encode_ch (enc, ',');
		300
207	if (enc->flags & F_INDENT) \	301	if (enc->json.flags & F_INDENT)
208	NL; \	302	encode_nl (enc);
209	else if (enc->flags & F_SPACE_AFTER) \	303	else if (enc->json.flags & F_SPACE_AFTER)
210	SPACE; \	304	encode_space (enc);
211	SE	305	}
212		306
213	static void encode_sv (enc_t *enc, SV *sv);	307	static void encode_sv (enc_t *enc, SV *sv);
214		308
215	static void	309	static void
216	encode_av (enc_t *enc, AV *av)	310	encode_av (enc_t *enc, AV *av)
217	{	311	{
218	int i, len = av_len (av);	312	int i, len = av_len (av);
219		313
220	encode_ch (enc, '['); NL;	314	if (enc->indent >= enc->maxdepth)
		315	croak ("data structure too deep (hit recursion limit)");
		316
		317	encode_ch (enc, '['); encode_nl (enc);
221	++enc->indent;	318	++enc->indent;
222		319
223	for (i = 0; i <= len; ++i)	320	for (i = 0; i <= len; ++i)
224	{	321	{
225	INDENT;	322	SV **svp = av_fetch (av, i, 0);
226	encode_sv (enc, *av_fetch (av, i, 0));	323
		324	encode_indent (enc);
		325
		326	if (svp)
		327	encode_sv (enc, *svp);
		328	else
		329	encode_str (enc, "null", 4, 0);
227		330
228	if (i < len)	331	if (i < len)
229	COMMA;	332	encode_comma (enc);
230	}	333	}
231		334
232	NL;	335	encode_nl (enc);
233		336
234	--enc->indent;	337	--enc->indent;
235	INDENT; encode_ch (enc, ']');	338	encode_indent (enc); encode_ch (enc, ']');
236	}	339	}
237		340
238	static void	341	static void
239	encode_he (enc_t *enc, HE *he)	342	encode_hk (enc_t *enc, HE *he)
240	{	343	{
241	encode_ch (enc, '"');	344	encode_ch (enc, '"');
242		345
243	if (HeKLEN (he) == HEf_SVKEY)	346	if (HeKLEN (he) == HEf_SVKEY)
244	{	347	{
…		…
254	else	357	else
255	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	358	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
256		359
257	encode_ch (enc, '"');	360	encode_ch (enc, '"');
258		361
259	if (enc->flags & F_SPACE_BEFORE) SPACE;	362	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
260	encode_ch (enc, ':');	363	encode_ch (enc, ':');
261	if (enc->flags & F_SPACE_AFTER ) SPACE;	364	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
262	encode_sv (enc, HeVAL (he));
263	}	365	}
264		366
265	// compare hash entries, used when all keys are bytestrings	367	// compare hash entries, used when all keys are bytestrings
266	static int	368	static int
267	he_cmp_fast (const void *a_, const void *b_)	369	he_cmp_fast (const void *a_, const void *b_)
…		…
272	HE *b = *(HE **)b_;	374	HE *b = *(HE **)b_;
273		375
274	STRLEN la = HeKLEN (a);	376	STRLEN la = HeKLEN (a);
275	STRLEN lb = HeKLEN (b);	377	STRLEN lb = HeKLEN (b);
276		378
277	if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	379	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
278	cmp = la < lb ? -1 : la == lb ? 0 : 1;	380	cmp = lb - la;
279		381
280	return cmp;	382	return cmp;
281	}	383	}
282		384
283	// compare hash entries, used when some keys are sv's or utf-x	385	// compare hash entries, used when some keys are sv's or utf-x
284	static int	386	static int
285	he_cmp_slow (const void *a, const void *b)	387	he_cmp_slow (const void *a, const void *b)
286	{	388	{
287	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	389	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
288	}	390	}
289		391
290	static void	392	static void
291	encode_hv (enc_t *enc, HV *hv)	393	encode_hv (enc_t *enc, HV *hv)
292	{	394	{
		395	HE *he;
293	int count, i;	396	int count;
294		397
		398	if (enc->indent >= enc->maxdepth)
		399	croak ("data structure too deep (hit recursion limit)");
		400
295	encode_ch (enc, '{'); NL; ++enc->indent;	401	encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;
296		402
297	if ((count = hv_iterinit (hv)))
298	{
299	// for canonical output we have to sort by keys first	403	// for canonical output we have to sort by keys first
300	// actually, this is mostly due to the stupid so-called	404	// actually, this is mostly due to the stupid so-called
301	// security workaround added somewhere in 5.8.x.	405	// security workaround added somewhere in 5.8.x.
302	// that randomises hash orderings	406	// that randomises hash orderings
303	if (enc->flags & F_CANONICAL)	407	if (enc->json.flags & F_CANONICAL)
		408	{
		409	int count = hv_iterinit (hv);
		410
		411	if (SvMAGICAL (hv))
304	{	412	{
305	HE *he, *hes [count];	413	// need to count by iterating. could improve by dynamically building the vector below
		414	// but I don't care for the speed of this special case.
		415	// note also that we will run into undefined behaviour when the two iterations
		416	// do not result in the same count, something I might care for in some later release.
		417
		418	count = 0;
		419	while (hv_iternext (hv))
		420	++count;
		421
		422	hv_iterinit (hv);
		423	}
		424
		425	if (count)
		426	{
306	int fast = 1;	427	int i, fast = 1;
		428	#if defined(__BORLANDC__) || defined(_MSC_VER)
		429	HE **hes = _alloca (count * sizeof (HE));
		430	#else
		431	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
		432	#endif
307		433
308	i = 0;	434	i = 0;
309	while ((he = hv_iternext (hv)))	435	while ((he = hv_iternext (hv)))
310	{	436	{
311	hes [i++] = he;	437	hes [i++] = he;
…		…
317		443
318	if (fast)	444	if (fast)
319	qsort (hes, count, sizeof (HE *), he_cmp_fast);	445	qsort (hes, count, sizeof (HE *), he_cmp_fast);
320	else	446	else
321	{	447	{
322	// hack to disable "use bytes"	448	// hack to forcefully disable "use bytes"
323	COP *oldcop = PL_curcop, cop;	449	COP cop = *PL_curcop;
324	cop.op_private = 0;	450	cop.op_private = 0;
		451
		452	ENTER;
		453	SAVETMPS;
		454
		455	SAVEVPTR (PL_curcop);
325	PL_curcop = &cop;	456	PL_curcop = &cop;
326		457
327	SAVETMPS;
328	qsort (hes, count, sizeof (HE *), he_cmp_slow);	458	qsort (hes, count, sizeof (HE *), he_cmp_slow);
		459
329	FREETMPS;	460	FREETMPS;
330		461	LEAVE;
331	PL_curcop = oldcop;
332	}
333
334	for (i = 0; i < count; ++i)
335	{	462	}
336	INDENT;
337	encode_he (enc, hes [i]);
338		463
339	if (i < count - 1)	464	while (count--)
340	COMMA;
341	}	465	{
		466	encode_indent (enc);
		467	he = hes [count];
		468	encode_hk (enc, he);
		469	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
342		470
		471	if (count)
		472	encode_comma (enc);
343	NL;	473	}
		474	}
		475	}
		476	else
		477	{
		478	if (hv_iterinit (hv) || SvMAGICAL (hv))
		479	if ((he = hv_iternext (hv)))
		480	for (;;)
		481	{
		482	encode_indent (enc);
		483	encode_hk (enc, he);
		484	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
		485
		486	if (!(he = hv_iternext (hv)))
		487	break;
		488
		489	encode_comma (enc);
		490	}
		491	}
		492
		493	encode_nl (enc);
		494
		495	--enc->indent; encode_indent (enc); encode_ch (enc, '}');
		496	}
		497
		498	// encode objects, arrays and special \0=false and \1=true values.
		499	static void
		500	encode_rv (enc_t *enc, SV *sv)
		501	{
		502	svtype svt;
		503
		504	SvGETMAGIC (sv);
		505	svt = SvTYPE (sv);
		506
		507	if (expect_false (SvOBJECT (sv)))
		508	{
		509	HV *stash = !JSON_SLOW || json_boolean_stash
		510	? json_boolean_stash
		511	: gv_stashpv ("JSON::XS::Boolean", 1);
		512
		513	if (SvSTASH (sv) == stash)
		514	{
		515	if (SvIV (sv))
		516	encode_str (enc, "true", 4, 0);
		517	else
		518	encode_str (enc, "false", 5, 0);
344	}	519	}
345	else	520	else
346	{	521	{
347	SV *sv;	522	#if 0
348	HE *he = hv_iternext (hv);	523	if (0 && sv_derived_from (rv, "JSON::Literal"))
349
350	for (;;)
351	{
352	INDENT;
353	encode_he (enc, he);
354
355	if (!(he = hv_iternext (hv)))
356	break;
357
358	COMMA;
359	}	524	{
360		525	// not yet
361	NL;	526	}
		527	#endif
		528	if (enc->json.flags & F_CONV_BLESSED)
		529	{
		530	// we re-bless the reference to get overload and other niceties right
		531	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
		532
		533	if (to_json)
		534	{
		535	dSP;
		536
		537	ENTER; SAVETMPS; PUSHMARK (SP);
		538	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		539
		540	// calling with G_SCALAR ensures that we always get a 1 return value
		541	PUTBACK;
		542	call_sv ((SV *)GvCV (to_json), G_SCALAR);
		543	SPAGAIN;
		544
		545	// catch this surprisingly common error
		546	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		547	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		548
		549	sv = POPs;
		550	PUTBACK;
		551
		552	encode_sv (enc, sv);
		553
		554	FREETMPS; LEAVE;
		555	}
		556	else if (enc->json.flags & F_ALLOW_BLESSED)
		557	encode_str (enc, "null", 4, 0);
		558	else
		559	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		560	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		561	}
		562	else if (enc->json.flags & F_ALLOW_BLESSED)
		563	encode_str (enc, "null", 4, 0);
		564	else
		565	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		566	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
362	}	567	}
363	}	568	}
		569	else if (svt == SVt_PVHV)
		570	encode_hv (enc, (HV *)sv);
		571	else if (svt == SVt_PVAV)
		572	encode_av (enc, (AV *)sv);
		573	else if (svt < SVt_PVAV)
		574	{
		575	STRLEN len = 0;
		576	char *pv = svt ? SvPV (sv, len) : 0;
364		577
365	--enc->indent; INDENT; encode_ch (enc, '}');	578	if (len == 1 && *pv == '1')
		579	encode_str (enc, "true", 4, 0);
		580	else if (len == 1 && *pv == '0')
		581	encode_str (enc, "false", 5, 0);
		582	else
		583	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		584	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		585	}
		586	else
		587	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		588	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
366	}	589	}
367		590
368	static void	591	static void
369	encode_sv (enc_t *enc, SV *sv)	592	encode_sv (enc_t *enc, SV *sv)
370	{	593	{
…		…
378	encode_str (enc, str, len, SvUTF8 (sv));	601	encode_str (enc, str, len, SvUTF8 (sv));
379	encode_ch (enc, '"');	602	encode_ch (enc, '"');
380	}	603	}
381	else if (SvNOKp (sv))	604	else if (SvNOKp (sv))
382	{	605	{
		606	// trust that perl will do the right thing w.r.t. JSON syntax.
383	need (enc, NV_DIG + 32);	607	need (enc, NV_DIG + 32);
384	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	608	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
385	enc->cur += strlen (enc->cur);	609	enc->cur += strlen (enc->cur);
386	}	610	}
387	else if (SvIOKp (sv))	611	else if (SvIOKp (sv))
388	{	612	{
389	need (enc, 64);	613	// we assume we can always read an IV as a UV
		614	if (SvUV (sv) & ~(UV)0x7fff)
		615	{
		616	// large integer, use the (rather slow) snprintf way.
		617	need (enc, sizeof (UV) * 3);
390	enc->cur +=	618	enc->cur +=
391	SvIsUV(sv)	619	SvIsUV(sv)
392	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	620	? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
393	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	621	: snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
		622	}
		623	else
		624	{
		625	// optimise the "small number case"
		626	// code will likely be branchless and use only a single multiplication
		627	I32 i = SvIV (sv);
		628	U32 u;
		629	char digit, nz = 0;
		630
		631	need (enc, 6);
		632
		633	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		634	u = i < 0 ? -i : i;
		635
		636	// convert to 4.28 fixed-point representation
		637	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		638
		639	// now output digit by digit, each time masking out the integer part
		640	// and multiplying by 5 while moving the decimal point one to the right,
		641	// resulting in a net multiplication by 10.
		642	// we always write the digit to memory but conditionally increment
		643	// the pointer, to ease the usage of conditional move instructions.
		644	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
		645	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
		646	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
		647	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
		648	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		649	}
394	}	650	}
395	else if (SvROK (sv))	651	else if (SvROK (sv))
396	{	652	encode_rv (enc, SvRV (sv));
397	if (!--enc->max_recurse)
398	croak ("data structure too deep (hit recursion limit)");
399
400	sv = SvRV (sv);
401
402	switch (SvTYPE (sv))
403	{
404	case SVt_PVAV: encode_av (enc, (AV *)sv); break;
405	case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
406
407	default:
408	croak ("JSON can only represent references to arrays or hashes");
409	}
410	}
411	else if (!SvOK (sv))	653	else if (!SvOK (sv))
412	encode_str (enc, "null", 4, 0);	654	encode_str (enc, "null", 4, 0);
413	else	655	else
414	croak ("encountered perl type that JSON cannot handle");	656	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
		657	SvPV_nolen (sv), SvFLAGS (sv));
415	}	658	}
416		659
417	static SV *	660	static SV *
418	encode_json (SV *scalar, UV flags)	661	encode_json (SV *scalar, JSON *json)
419	{	662	{
420	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))
421	croak ("hash- or arraref required (not a simple scalar, use allow_nonref to allow this)");
422
423	enc_t enc;	663	enc_t enc;
424	enc.flags = flags;	664
		665	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
		666	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
		667
		668	enc.json = *json;
425	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	669	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
426	enc.cur = SvPVX (enc.sv);	670	enc.cur = SvPVX (enc.sv);
427	enc.end = SvEND (enc.sv);	671	enc.end = SvEND (enc.sv);
428	enc.max_recurse = 0;
429	enc.indent = 0;	672	enc.indent = 0;
		673	enc.maxdepth = DEC_DEPTH (enc.json.flags);
430		674
431	SvPOK_only (enc.sv);	675	SvPOK_only (enc.sv);
432	encode_sv (&enc, scalar);	676	encode_sv (&enc, scalar);
433		677
		678	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		679	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		680
434	if (!(flags & (F_ASCII | F_UTF8)))	681	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
435	SvUTF8_on (enc.sv);	682	SvUTF8_on (enc.sv);
436		683
437	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
438
439	if (enc.flags & F_SHRINK)	684	if (enc.json.flags & F_SHRINK)
440	shrink (enc.sv);	685	shrink (enc.sv);
441		686
442	return enc.sv;	687	return enc.sv;
443	}	688	}
444		689
445	/////////////////////////////////////////////////////////////////////////////	690	/////////////////////////////////////////////////////////////////////////////
		691	// decoder
446		692
447	#define WS \	693	// structure used for decoding JSON
		694	typedef struct
		695	{
		696	char *cur; // current parser pointer
		697	char *end; // end of input string
		698	const char *err; // parse error, if != 0
		699	JSON json;
		700	U32 depth; // recursion depth
		701	U32 maxdepth; // recursion depth limit
		702	} dec_t;
		703
		704	inline void
		705	decode_comment (dec_t *dec)
		706	{
		707	// only '#'-style comments allowed a.t.m.
		708
		709	while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
		710	++dec->cur;
		711	}
		712
		713	inline void
		714	decode_ws (dec_t *dec)
		715	{
448	for (;;) \	716	for (;;)
449	{ \	717	{
450	char ch = *dec->cur; \	718	char ch = *dec->cur;
		719
451	if (ch > 0x20 \	720	if (ch > 0x20)
		721	{
		722	if (expect_false (ch == '#'))
		723	{
		724	if (dec->json.flags & F_RELAXED)
		725	decode_comment (dec);
		726	else
		727	break;
		728	}
		729	else
		730	break;
		731	}
452	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	732	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
453	break; \	733	break; // parse error, but let higher level handle it, gives better error messages
		734
454	++dec->cur; \	735	++dec->cur;
455	}	736	}
		737	}
456		738
457	#define ERR(reason) SB dec->err = reason; goto fail; SE	739	#define ERR(reason) SB dec->err = reason; goto fail; SE
		740
458	#define EXPECT_CH(ch) SB \	741	#define EXPECT_CH(ch) SB \
459	if (*dec->cur != ch) \	742	if (*dec->cur != ch) \
460	ERR (# ch " expected"); \	743	ERR (# ch " expected"); \
461	++dec->cur; \	744	++dec->cur; \
462	SE	745	SE
463		746
		747	#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
		748	#define DEC_DEC_DEPTH --dec->depth
		749
464	static SV *decode_sv (dec_t *dec);	750	static SV *decode_sv (dec_t *dec);
465		751
466	static signed char decode_hexdigit[256];	752	static signed char decode_hexdigit[256];
467		753
468	static UV	754	static UV
469	decode_4hex (dec_t *dec)	755	decode_4hex (dec_t *dec)
470	{	756	{
471	signed char d1, d2, d3, d4;	757	signed char d1, d2, d3, d4;
		758	unsigned char *cur = (unsigned char *)dec->cur;
472		759
473	d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]];	760	d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
474	if (d1 < 0) ERR ("four hexadecimal digits expected");	761	d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
475	d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]];	762	d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
476	if (d2 < 0) ERR ("four hexadecimal digits expected");	763	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
477	d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
478	if (d3 < 0) ERR ("four hexadecimal digits expected");
479	d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
480	if (d4 < 0) ERR ("four hexadecimal digits expected");
481		764
482	dec->cur += 4;	765	dec->cur += 4;
483		766
484	return ((UV)d1) << 12	767	return ((UV)d1) << 12
485	| ((UV)d2) << 8	768	| ((UV)d2) << 8
…		…
488		771
489	fail:	772	fail:
490	return (UV)-1;	773	return (UV)-1;
491	}	774	}
492		775
493	#define APPEND_GROW(n) SB \
494	if (cur + (n) >= end) \
495	{ \
496	STRLEN ofs = cur - SvPVX (sv); \
497	SvGROW (sv, ofs + (n) + 1); \
498	cur = SvPVX (sv) + ofs; \
499	end = SvEND (sv); \
500	} \
501	SE
502
503	#define APPEND_CH(ch) SB \
504	APPEND_GROW (1); \
505	*cur++ = (ch); \
506	SE
507
508	static SV *	776	static SV *
509	decode_str (dec_t *dec)	777	decode_str (dec_t *dec)
510	{	778	{
511	SV *sv = NEWSV (0,2);	779	SV *sv = 0;
512	int utf8 = 0;	780	int utf8 = 0;
513	char *cur = SvPVX (sv);	781	char *dec_cur = dec->cur;
514	char *end = SvEND (sv);
515		782
516	for (;;)	783	do
517	{	784	{
518	unsigned char ch = *(unsigned char *)dec->cur;	785	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		786	char *cur = buf;
519		787
520	if (ch == '"')	788	do
521	break;
522	else if (ch == '\\')
523	{	789	{
524	switch (*++dec->cur)	790	unsigned char ch = *(unsigned char *)dec_cur++;
		791
		792	if (expect_false (ch == '"'))
		793	{
		794	--dec_cur;
		795	break;
525	{	796	}
526	case '\\':	797	else if (expect_false (ch == '\\'))
527	case '/':	798	{
528	case '"': APPEND_CH (*dec->cur++); break;	799	switch (*dec_cur)
529
530	case 'b': APPEND_CH ('\010'); ++dec->cur; break;
531	case 't': APPEND_CH ('\011'); ++dec->cur; break;
532	case 'n': APPEND_CH ('\012'); ++dec->cur; break;
533	case 'f': APPEND_CH ('\014'); ++dec->cur; break;
534	case 'r': APPEND_CH ('\015'); ++dec->cur; break;
535
536	case 'u':
537	{	800	{
538	UV lo, hi;	801	case '\\':
539	++dec->cur;	802	case '/':
		803	case '"': *cur++ = *dec_cur++; break;
540		804
541	hi = decode_4hex (dec);	805	case 'b': ++dec_cur; *cur++ = '\010'; break;
542	if (hi == (UV)-1)	806	case 't': ++dec_cur; *cur++ = '\011'; break;
543	goto fail;	807	case 'n': ++dec_cur; *cur++ = '\012'; break;
		808	case 'f': ++dec_cur; *cur++ = '\014'; break;
		809	case 'r': ++dec_cur; *cur++ = '\015'; break;
544		810
545	// possibly a surrogate pair	811	case 'u':
546	if (hi >= 0xd800 && hi < 0xdc00)
547	{	812	{
548	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	813	UV lo, hi;
549	ERR ("missing low surrogate character in surrogate pair");	814	++dec_cur;
550		815
551	dec->cur += 2;	816	dec->cur = dec_cur;
552
553	lo = decode_4hex (dec);	817	hi = decode_4hex (dec);
		818	dec_cur = dec->cur;
554	if (lo == (UV)-1)	819	if (hi == (UV)-1)
555	goto fail;	820	goto fail;
556		821
		822	// possibly a surrogate pair
		823	if (hi >= 0xd800)
		824	if (hi < 0xdc00)
		825	{
		826	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
		827	ERR ("missing low surrogate character in surrogate pair");
		828
		829	dec_cur += 2;
		830
		831	dec->cur = dec_cur;
		832	lo = decode_4hex (dec);
		833	dec_cur = dec->cur;
		834	if (lo == (UV)-1)
		835	goto fail;
		836
557	if (lo < 0xdc00 || lo >= 0xe000)	837	if (lo < 0xdc00 || lo >= 0xe000)
558	ERR ("surrogate pair expected");	838	ERR ("surrogate pair expected");
559		839
560	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;	840	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
		841	}
		842	else if (hi < 0xe000)
		843	ERR ("missing high surrogate character in surrogate pair");
		844
		845	if (hi >= 0x80)
		846	{
		847	utf8 = 1;
		848
		849	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
		850	}
		851	else
		852	*cur++ = hi;
561	}	853	}
562	else if (hi >= 0xdc00 && hi < 0xe000)
563	ERR ("missing high surrogate character in surrogate pair");
564
565	if (hi >= 0x80)
566	{	854	break;
567	utf8 = 1;
568		855
569	APPEND_GROW (4); // at most 4 bytes for 21 bits
570	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
571	}
572	else	856	default:
573	APPEND_CH (hi);	857	--dec_cur;
		858	ERR ("illegal backslash escape sequence in string");
574	}	859	}
575	break;	860	}
		861	else if (expect_true (ch >= 0x20 && ch <= 0x7f))
		862	*cur++ = ch;
		863	else if (ch >= 0x80)
		864	{
		865	STRLEN clen;
		866	UV uch;
576		867
577	default:
578	--dec->cur;	868	--dec_cur;
579	ERR ("illegal backslash escape sequence in string");	869
		870	uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		871	if (clen == (STRLEN)-1)
		872	ERR ("malformed UTF-8 character in JSON string");
		873
		874	do
		875	*cur++ = *dec_cur++;
		876	while (--clen);
		877
		878	utf8 = 1;
		879	}
		880	else
		881	{
		882	--dec_cur;
		883
		884	if (!ch)
		885	ERR ("unexpected end of string while parsing JSON string");
		886	else
		887	ERR ("invalid character encountered while parsing JSON string");
580	}	888	}
581	}	889	}
582	else if (ch >= 0x20 && ch <= 0x7f)	890	while (cur < buf + SHORT_STRING_LEN);
583	APPEND_CH (*dec->cur++);	891
584	else if (ch >= 0x80)
585	{	892	{
586	STRLEN clen;	893	STRLEN len = cur - buf;
587	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
588	if (clen == (STRLEN)-1)
589	ERR ("malformed UTF-8 character in JSON string");
590		894
591	APPEND_GROW (clen);	895	if (sv)
592	do
593	{	896	{
594	*cur++ = *dec->cur++;	897	SvGROW (sv, SvCUR (sv) + len + 1);
		898	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
		899	SvCUR_set (sv, SvCUR (sv) + len);
595	}	900	}
596	while (--clen);
597
598	utf8 = 1;
599	}
600	else if (dec->cur == dec->end)
601	ERR ("unexpected end of string while parsing json string");
602	else	901	else
603	ERR ("invalid character encountered");	902	sv = newSVpvn (buf, len);
604	}	903	}
		904	}
		905	while (*dec_cur != '"');
605		906
606	++dec->cur;	907	++dec_cur;
607		908
608	SvCUR_set (sv, cur - SvPVX (sv));	909	if (sv)
609		910	{
610	SvPOK_only (sv);	911	SvPOK_only (sv);
611	*SvEND (sv) = 0;	912	*SvEND (sv) = 0;
612		913
613	if (utf8)	914	if (utf8)
614	SvUTF8_on (sv);	915	SvUTF8_on (sv);
		916	}
		917	else
		918	sv = newSVpvn ("", 0);
615		919
616	if (dec->flags & F_SHRINK)	920	dec->cur = dec_cur;
617	shrink (sv);
618
619	return sv;	921	return sv;
620		922
621	fail:	923	fail:
622	SvREFCNT_dec (sv);	924	dec->cur = dec_cur;
623	return 0;	925	return 0;
624	}	926	}
625		927
626	static SV *	928	static SV *
627	decode_num (dec_t *dec)	929	decode_num (dec_t *dec)
…		…
685	is_nv = 1;	987	is_nv = 1;
686	}	988	}
687		989
688	if (!is_nv)	990	if (!is_nv)
689	{	991	{
690	UV uv;	992	int len = dec->cur - start;
691	int numtype = grok_number (start, dec->cur - start, &uv);	993
692	if (numtype & IS_NUMBER_IN_UV)	994	// special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
693	if (numtype & IS_NUMBER_NEG)	995	if (*start == '-')
		996	switch (len)
694	{	997	{
695	if (uv < (UV)IV_MIN)	998	case 2: return newSViv (-( start [1] - '0' * 1));
696	return newSViv (-(IV)uv);	999	case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
		1000	case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		1001	case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
697	}	1002	}
		1003	else
		1004	switch (len)
		1005	{
		1006	case 1: return newSViv ( start [0] - '0' * 1);
		1007	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1008	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1009	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1010	}
		1011
		1012	{
		1013	UV uv;
		1014	int numtype = grok_number (start, len, &uv);
		1015	if (numtype & IS_NUMBER_IN_UV)
		1016	if (numtype & IS_NUMBER_NEG)
		1017	{
		1018	if (uv < (UV)IV_MIN)
		1019	return newSViv (-(IV)uv);
		1020	}
698	else	1021	else
699	return newSVuv (uv);	1022	return newSVuv (uv);
700	}	1023	}
701		1024
		1025	len -= *start == '-' ? 1 : 0;
		1026
		1027	// does not fit into IV or UV, try NV
		1028	if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len)
		1029	#if defined (LDBL_DIG)
		1030	|| (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len)
		1031	#endif
		1032	)
		1033	// fits into NV without loss of precision
		1034	return newSVnv (Atof (start));
		1035
		1036	// everything else fails, convert it to a string
		1037	return newSVpvn (start, dec->cur - start);
		1038	}
		1039
		1040	// loss of precision here
702	return newSVnv (Atof (start));	1041	return newSVnv (Atof (start));
703		1042
704	fail:	1043	fail:
705	return 0;	1044	return 0;
706	}	1045	}
…		…
708	static SV *	1047	static SV *
709	decode_av (dec_t *dec)	1048	decode_av (dec_t *dec)
710	{	1049	{
711	AV *av = newAV ();	1050	AV *av = newAV ();
712		1051
713	WS;	1052	DEC_INC_DEPTH;
		1053	decode_ws (dec);
		1054
714	if (*dec->cur == ']')	1055	if (*dec->cur == ']')
715	++dec->cur;	1056	++dec->cur;
716	else	1057	else
717	for (;;)	1058	for (;;)
718	{	1059	{
…		…
722	if (!value)	1063	if (!value)
723	goto fail;	1064	goto fail;
724		1065
725	av_push (av, value);	1066	av_push (av, value);
726		1067
727	WS;	1068	decode_ws (dec);
728		1069
729	if (*dec->cur == ']')	1070	if (*dec->cur == ']')
730	{	1071	{
731	++dec->cur;	1072	++dec->cur;
732	break;	1073	break;
…		…
734		1075
735	if (*dec->cur != ',')	1076	if (*dec->cur != ',')
736	ERR (", or ] expected while parsing array");	1077	ERR (", or ] expected while parsing array");
737		1078
738	++dec->cur;	1079	++dec->cur;
		1080
		1081	decode_ws (dec);
		1082
		1083	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1084	{
		1085	++dec->cur;
		1086	break;
		1087	}
739	}	1088	}
740		1089
		1090	DEC_DEC_DEPTH;
741	return newRV_noinc ((SV *)av);	1091	return newRV_noinc ((SV *)av);
742		1092
743	fail:	1093	fail:
744	SvREFCNT_dec (av);	1094	SvREFCNT_dec (av);
		1095	DEC_DEC_DEPTH;
745	return 0;	1096	return 0;
746	}	1097	}
747		1098
748	static SV *	1099	static SV *
749	decode_hv (dec_t *dec)	1100	decode_hv (dec_t *dec)
750	{	1101	{
		1102	SV *sv;
751	HV *hv = newHV ();	1103	HV *hv = newHV ();
752		1104
753	WS;	1105	DEC_INC_DEPTH;
		1106	decode_ws (dec);
		1107
754	if (*dec->cur == '}')	1108	if (*dec->cur == '}')
755	++dec->cur;	1109	++dec->cur;
756	else	1110	else
757	for (;;)	1111	for (;;)
758	{	1112	{
759	SV *key, *value;
760
761	WS; EXPECT_CH ('"');	1113	EXPECT_CH ('"');
762		1114
763	key = decode_str (dec);	1115	// heuristic: assume that
764	if (!key)	1116	// a) decode_str + hv_store_ent are abysmally slow.
765	goto fail;	1117	// b) most hash keys are short, simple ascii text.
		1118	// => try to "fast-match" such strings to avoid
		1119	// the overhead of decode_str + hv_store_ent.
		1120	{
		1121	SV *value;
		1122	char *p = dec->cur;
		1123	char *e = p + 24; // only try up to 24 bytes
766		1124
767	WS; EXPECT_CH (':');	1125	for (;;)
768
769	value = decode_sv (dec);
770	if (!value)
771	{	1126	{
		1127	// the >= 0x80 is true on most architectures
		1128	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1129	{
		1130	// slow path, back up and use decode_str
		1131	SV *key = decode_str (dec);
		1132	if (!key)
		1133	goto fail;
		1134
		1135	decode_ws (dec); EXPECT_CH (':');
		1136
		1137	decode_ws (dec);
		1138	value = decode_sv (dec);
		1139	if (!value)
		1140	{
		1141	SvREFCNT_dec (key);
		1142	goto fail;
		1143	}
		1144
		1145	hv_store_ent (hv, key, value, 0);
772	SvREFCNT_dec (key);	1146	SvREFCNT_dec (key);
		1147
		1148	break;
		1149	}
		1150	else if (*p == '"')
		1151	{
		1152	// fast path, got a simple key
		1153	char *key = dec->cur;
		1154	int len = p - key;
		1155	dec->cur = p + 1;
		1156
		1157	decode_ws (dec); EXPECT_CH (':');
		1158
		1159	decode_ws (dec);
		1160	value = decode_sv (dec);
		1161	if (!value)
773	goto fail;	1162	goto fail;
		1163
		1164	hv_store (hv, key, len, value, 0);
		1165
		1166	break;
		1167	}
		1168
		1169	++p;
774	}	1170	}
775
776	//TODO: optimise
777	hv_store_ent (hv, key, value, 0);
778
779	WS;	1171	}
		1172
		1173	decode_ws (dec);
780		1174
781	if (*dec->cur == '}')	1175	if (*dec->cur == '}')
782	{	1176	{
783	++dec->cur;	1177	++dec->cur;
784	break;	1178	break;
…		…
786		1180
787	if (*dec->cur != ',')	1181	if (*dec->cur != ',')
788	ERR (", or } expected while parsing object/hash");	1182	ERR (", or } expected while parsing object/hash");
789		1183
790	++dec->cur;	1184	++dec->cur;
		1185
		1186	decode_ws (dec);
		1187
		1188	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1189	{
		1190	++dec->cur;
		1191	break;
		1192	}
791	}	1193	}
792		1194
		1195	DEC_DEC_DEPTH;
793	return newRV_noinc ((SV *)hv);	1196	sv = newRV_noinc ((SV *)hv);
		1197
		1198	// check filter callbacks
		1199	if (dec->json.flags & F_HOOK)
		1200	{
		1201	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1202	{
		1203	HE *cb, *he;
		1204
		1205	hv_iterinit (hv);
		1206	he = hv_iternext (hv);
		1207	hv_iterinit (hv);
		1208
		1209	// the next line creates a mortal sv each time its called.
		1210	// might want to optimise this for common cases.
		1211	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1212
		1213	if (cb)
		1214	{
		1215	dSP;
		1216	int count;
		1217
		1218	ENTER; SAVETMPS; PUSHMARK (SP);
		1219	XPUSHs (HeVAL (he));
		1220
		1221	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1222
		1223	if (count == 1)
		1224	{
		1225	sv = newSVsv (POPs);
		1226	FREETMPS; LEAVE;
		1227	return sv;
		1228	}
		1229
		1230	FREETMPS; LEAVE;
		1231	}
		1232	}
		1233
		1234	if (dec->json.cb_object)
		1235	{
		1236	dSP;
		1237	int count;
		1238
		1239	ENTER; SAVETMPS; PUSHMARK (SP);
		1240	XPUSHs (sv_2mortal (sv));
		1241
		1242	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1243
		1244	if (count == 1)
		1245	{
		1246	sv = newSVsv (POPs);
		1247	FREETMPS; LEAVE;
		1248	return sv;
		1249	}
		1250
		1251	SvREFCNT_inc (sv);
		1252	FREETMPS; LEAVE;
		1253	}
		1254	}
		1255
		1256	return sv;
794		1257
795	fail:	1258	fail:
796	SvREFCNT_dec (hv);	1259	SvREFCNT_dec (hv);
		1260	DEC_DEC_DEPTH;
797	return 0;	1261	return 0;
798	}	1262	}
799		1263
800	static SV *	1264	static SV *
801	decode_sv (dec_t *dec)	1265	decode_sv (dec_t *dec)
802	{	1266	{
803	WS;	1267	// the beauty of JSON: you need exactly one character lookahead
		1268	// to parse anything.
804	switch (*dec->cur)	1269	switch (*dec->cur)
805	{	1270	{
806	case '"': ++dec->cur; return decode_str (dec);	1271	case '"': ++dec->cur; return decode_str (dec);
807	case '[': ++dec->cur; return decode_av (dec);	1272	case '[': ++dec->cur; return decode_av (dec);
808	case '{': ++dec->cur; return decode_hv (dec);	1273	case '{': ++dec->cur; return decode_hv (dec);
…		…
814		1279
815	case 't':	1280	case 't':
816	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1281	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
817	{	1282	{
818	dec->cur += 4;	1283	dec->cur += 4;
819	return newSViv (1);	1284	#if JSON_SLOW
		1285	json_true = get_sv ("JSON::XS::true", 1); SvREADONLY_on (json_true);
		1286	#endif
		1287	return SvREFCNT_inc (json_true);
820	}	1288	}
821	else	1289	else
822	ERR ("'true' expected");	1290	ERR ("'true' expected");
823		1291
824	break;	1292	break;
825		1293
826	case 'f':	1294	case 'f':
827	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1295	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
828	{	1296	{
829	dec->cur += 5;	1297	dec->cur += 5;
830	return newSViv (0);	1298	#if JSON_SLOW
		1299	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1300	#endif
		1301	return SvREFCNT_inc (json_false);
831	}	1302	}
832	else	1303	else
833	ERR ("'false' expected");	1304	ERR ("'false' expected");
834		1305
835	break;	1306	break;
…		…
844	ERR ("'null' expected");	1315	ERR ("'null' expected");
845		1316
846	break;	1317	break;
847		1318
848	default:	1319	default:
849	ERR ("malformed json string, neither array, object, number, string or atom");	1320	ERR ("malformed JSON string, neither array, object, number, string or atom");
850	break;	1321	break;
851	}	1322	}
852		1323
853	fail:	1324	fail:
854	return 0;	1325	return 0;
855	}	1326	}
856		1327
857	static SV *	1328	static SV *
858	decode_json (SV *string, UV flags)	1329	decode_json (SV *string, JSON *json, UV *offset_return)
859	{	1330	{
		1331	dec_t dec;
		1332	UV offset;
860	SV *sv;	1333	SV *sv;
861		1334
		1335	SvGETMAGIC (string);
		1336	SvUPGRADE (string, SVt_PV);
		1337
		1338	if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
		1339	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1340	(unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
		1341
862	if (flags & F_UTF8)	1342	if (json->flags & F_UTF8)
863	sv_utf8_downgrade (string, 0);	1343	sv_utf8_downgrade (string, 0);
864	else	1344	else
865	sv_utf8_upgrade (string);	1345	sv_utf8_upgrade (string);
866		1346
867	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1347	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
868		1348
869	dec_t dec;	1349	dec.json = *json;
870	dec.flags = flags;
871	dec.cur = SvPVX (string);	1350	dec.cur = SvPVX (string);
872	dec.end = SvEND (string);	1351	dec.end = SvEND (string);
873	dec.err = 0;	1352	dec.err = 0;
		1353	dec.depth = 0;
		1354	dec.maxdepth = DEC_DEPTH (dec.json.flags);
874		1355
		1356	if (dec.json.cb_object || dec.json.cb_sk_object)
		1357	dec.json.flags |= F_HOOK;
		1358
		1359	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1360
		1361	decode_ws (&dec);
875	sv = decode_sv (&dec);	1362	sv = decode_sv (&dec);
876		1363
		1364	if (!(offset_return || !sv))
		1365	{
		1366	// check for trailing garbage
		1367	decode_ws (&dec);
		1368
		1369	if (*dec.cur)
		1370	{
		1371	dec.err = "garbage after JSON object";
		1372	SvREFCNT_dec (sv);
		1373	sv = 0;
		1374	}
		1375	}
		1376
		1377	if (offset_return || !sv)
		1378	{
		1379	offset = dec.json.flags & F_UTF8
		1380	? dec.cur - SvPVX (string)
		1381	: utf8_distance (dec.cur, SvPVX (string));
		1382
		1383	if (offset_return)
		1384	*offset_return = offset;
		1385	}
		1386
877	if (!sv)	1387	if (!sv)
878	{	1388	{
879	IV offset = dec.flags & F_UTF8
880	? dec.cur - SvPVX (string)
881	: utf8_distance (dec.cur, SvPVX (string));
882	SV *uni = sv_newmortal ();	1389	SV *uni = sv_newmortal ();
		1390
883	// horrible hack to silence warning inside pv_uni_display	1391	// horrible hack to silence warning inside pv_uni_display
884	COP cop;	1392	COP cop = *PL_curcop;
885	memset (&cop, 0, sizeof (cop));
886	cop.cop_warnings = pWARN_NONE;	1393	cop.cop_warnings = pWARN_NONE;
		1394	ENTER;
887	SAVEVPTR (PL_curcop);	1395	SAVEVPTR (PL_curcop);
888	PL_curcop = &cop;	1396	PL_curcop = &cop;
889
890	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1397	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
		1398	LEAVE;
		1399
891	croak ("%s, at character offset %d (%s)",	1400	croak ("%s, at character offset %d [\"%s\"]",
892	dec.err,	1401	dec.err,
893	(int)offset,	1402	(int)offset,
894	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1403	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
895	}	1404	}
896		1405
897	sv = sv_2mortal (sv);	1406	sv = sv_2mortal (sv);
898		1407
899	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1408	if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
900	croak ("JSON object or array expected (but number, string, true, false or null found, use allow_nonref to allow this)");	1409	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
901		1410
902	return sv;	1411	return sv;
903	}	1412	}
904		1413
		1414	/////////////////////////////////////////////////////////////////////////////
		1415	// XS interface functions
		1416
905	MODULE = JSON::XS PACKAGE = JSON::XS	1417	MODULE = JSON::XS PACKAGE = JSON::XS
906		1418
907	BOOT:	1419	BOOT:
908	{	1420	{
909	int i;	1421	int i;
910		1422
911	memset (decode_hexdigit, 0xff, 256);
912	for (i = 10; i--; )	1423	for (i = 0; i < 256; ++i)
913	decode_hexdigit ['0' + i] = i;	1424	decode_hexdigit [i] =
		1425	i >= '0' && i <= '9' ? i - '0'
		1426	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1427	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1428	: -1;
914		1429
915	for (i = 7; i--; )	1430	json_stash = gv_stashpv ("JSON::XS" , 1);
		1431	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1432
		1433	json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
		1434	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1435	}
		1436
		1437	PROTOTYPES: DISABLE
		1438
		1439	void CLONE (...)
		1440	CODE:
		1441	json_stash = 0;
		1442	json_boolean_stash = 0;
		1443
		1444	void new (char *klass)
		1445	PPCODE:
		1446	{
		1447	SV *pv = NEWSV (0, sizeof (JSON));
		1448	SvPOK_only (pv);
		1449	Zero (SvPVX (pv), 1, JSON);
		1450	((JSON *)SvPVX (pv))->flags = F_DEFAULT;
		1451	XPUSHs (sv_2mortal (sv_bless (newRV_noinc (pv), JSON_STASH)));
		1452	}
		1453
		1454	void ascii (JSON *self, int enable = 1)
		1455	ALIAS:
		1456	ascii = F_ASCII
		1457	latin1 = F_LATIN1
		1458	utf8 = F_UTF8
		1459	indent = F_INDENT
		1460	canonical = F_CANONICAL
		1461	space_before = F_SPACE_BEFORE
		1462	space_after = F_SPACE_AFTER
		1463	pretty = F_PRETTY
		1464	allow_nonref = F_ALLOW_NONREF
		1465	shrink = F_SHRINK
		1466	allow_blessed = F_ALLOW_BLESSED
		1467	convert_blessed = F_CONV_BLESSED
		1468	relaxed = F_RELAXED
		1469	PPCODE:
		1470	{
		1471	if (enable)
		1472	self->flags |= ix;
		1473	else
		1474	self->flags &= ~ix;
		1475
		1476	XPUSHs (ST (0));
		1477	}
		1478
		1479	void max_depth (JSON *self, UV max_depth = 0x80000000UL)
		1480	PPCODE:
		1481	{
		1482	UV log2 = 0;
		1483
		1484	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
		1485
		1486	while ((1UL << log2) < max_depth)
		1487	++log2;
		1488
		1489	self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
		1490
		1491	XPUSHs (ST (0));
		1492	}
		1493
		1494	void max_size (JSON *self, UV max_size = 0)
		1495	PPCODE:
		1496	{
		1497	UV log2 = 0;
		1498
		1499	if (max_size > 0x80000000UL) max_size = 0x80000000UL;
		1500	if (max_size == 1) max_size = 2;
		1501
		1502	while ((1UL << log2) < max_size)
		1503	++log2;
		1504
		1505	self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
		1506
		1507	XPUSHs (ST (0));
		1508	}
		1509
		1510	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
		1511	PPCODE:
		1512	{
		1513	SvREFCNT_dec (self->cb_object);
		1514	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
		1515
		1516	XPUSHs (ST (0));
		1517	}
		1518
		1519	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
		1520	PPCODE:
		1521	{
		1522	if (!self->cb_sk_object)
		1523	self->cb_sk_object = newHV ();
		1524
		1525	if (SvOK (cb))
		1526	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1527	else
916	{	1528	{
917	decode_hexdigit ['a' + i] = 10 + i;	1529	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
918	decode_hexdigit ['A' + i] = 10 + i;	1530
		1531	if (!HvKEYS (self->cb_sk_object))
		1532	{
		1533	SvREFCNT_dec (self->cb_sk_object);
		1534	self->cb_sk_object = 0;
		1535	}
919	}	1536	}
920		1537
921	json_stash = gv_stashpv ("JSON::XS", 1);	1538	XPUSHs (ST (0));
922	}	1539	}
923		1540
924	PROTOTYPES: DISABLE	1541	void encode (JSON *self, SV *scalar)
		1542	PPCODE:
		1543	XPUSHs (encode_json (scalar, self));
925		1544
926	SV *new (char *dummy)	1545	void decode (JSON *self, SV *jsonstr)
		1546	PPCODE:
		1547	XPUSHs (decode_json (jsonstr, self, 0));
		1548
		1549	void decode_prefix (JSON *self, SV *jsonstr)
		1550	PPCODE:
		1551	{
		1552	UV offset;
		1553	EXTEND (SP, 2);
		1554	PUSHs (decode_json (jsonstr, self, &offset));
		1555	PUSHs (sv_2mortal (newSVuv (offset)));
		1556	}
		1557
		1558	void DESTROY (JSON *self)
927	CODE:	1559	CODE:
928	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1560	SvREFCNT_dec (self->cb_sk_object);
929	OUTPUT:	1561	SvREFCNT_dec (self->cb_object);
930	RETVAL
931
932	SV *ascii (SV *self, int enable = 1)
933	ALIAS:
934	ascii = F_ASCII
935	utf8 = F_UTF8
936	indent = F_INDENT
937	canonical = F_CANONICAL
938	space_before = F_SPACE_BEFORE
939	space_after = F_SPACE_AFTER
940	json_rpc = F_JSON_RPC
941	pretty = F_PRETTY
942	allow_nonref = F_ALLOW_NONREF
943	shrink = F_SHRINK
944	CODE:
945	{
946	UV *uv = SvJSON (self);
947	if (enable)
948	*uv |= ix;
949	else
950	*uv &= ~ix;
951
952	RETVAL = newSVsv (self);
953	}
954	OUTPUT:
955	RETVAL
956
957	void encode (SV *self, SV *scalar)
958	PPCODE:
959	XPUSHs (encode_json (scalar, *SvJSON (self)));
960
961	void decode (SV *self, SV *jsonstr)
962	PPCODE:
963	XPUSHs (decode_json (jsonstr, *SvJSON (self)));
964		1562
965	PROTOTYPES: ENABLE	1563	PROTOTYPES: ENABLE
966		1564
967	void to_json (SV *scalar)	1565	void to_json (SV *scalar)
968	PPCODE:	1566	PPCODE:
		1567	{
		1568	JSON json = { F_DEFAULT | F_UTF8 };
969	XPUSHs (encode_json (scalar, F_UTF8));	1569	XPUSHs (encode_json (scalar, &json));
		1570	}
970		1571
971	void from_json (SV *jsonstr)	1572	void from_json (SV *jsonstr)
972	PPCODE:	1573	PPCODE:
		1574	{
		1575	JSON json = { F_DEFAULT | F_UTF8 };
973	XPUSHs (decode_json (jsonstr, F_UTF8));	1576	XPUSHs (decode_json (jsonstr, &json, 0));
		1577	}
974		1578

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