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Comparing JSON-XS/XS.xs (file contents):
Revision 1.2 by root, Thu Mar 22 17:28:50 2007 UTC vs.
Revision 1.103 by root, Wed Jan 6 08:01:39 2010 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 <limits.h>
		10	#include <float.h>
8		11
		12	#if defined(__BORLANDC__) || defined(_MSC_VER)
		13	# define snprintf _snprintf // C compilers have this in stdio.h
		14	#endif
		15
		16	// some old perls do not have this, try to make it work, no
		17	// guarantees, though. if it breaks, you get to keep the pieces.
		18	#ifndef UTF8_MAXBYTES
		19	# define UTF8_MAXBYTES 13
		20	#endif
		21
		22	// three extra for rounding, sign, and end of string
		23	#define IVUV_MAXCHARS (sizeof (UV) * CHAR_BIT * 28 / 93 + 3)
		24
9	#define F_ASCII 0x00000001	25	#define F_ASCII 0x00000001UL
		26	#define F_LATIN1 0x00000002UL
10	#define F_UTF8 0x00000002	27	#define F_UTF8 0x00000004UL
11	#define F_INDENT 0x00000004	28	#define F_INDENT 0x00000008UL
12	#define F_CANONICAL 0x00000008	29	#define F_CANONICAL 0x00000010UL
13	#define F_SPACE_BEFORE 0x00000010	30	#define F_SPACE_BEFORE 0x00000020UL
14	#define F_SPACE_AFTER 0x00000020	31	#define F_SPACE_AFTER 0x00000040UL
15	#define F_JSON_RPC 0x00000040	32	#define F_ALLOW_NONREF 0x00000100UL
		33	#define F_SHRINK 0x00000200UL
		34	#define F_ALLOW_BLESSED 0x00000400UL
		35	#define F_CONV_BLESSED 0x00000800UL
		36	#define F_RELAXED 0x00001000UL
		37	#define F_ALLOW_UNKNOWN 0x00002000UL
		38	#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
16		39
17	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	40	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
18	#define F_DEFAULT 0
19		41
20	#define INIT_SIZE 32 // initial scalar size to be allocated	42	#define INIT_SIZE 32 // initial scalar size to be allocated
		43	#define INDENT_STEP 3 // spaces per indentation level
		44
		45	#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
21		46
22	#define SB do {	47	#define SB do {
23	#define SE } while (0)	48	#define SE } while (0)
24		49
25	static HV *json_stash;	50	#if __GNUC__ >= 3
		51	# define expect(expr,value) __builtin_expect ((expr), (value))
		52	# define INLINE static inline
		53	#else
		54	# define expect(expr,value) (expr)
		55	# define INLINE static
		56	#endif
		57
		58	#define expect_false(expr) expect ((expr) != 0, 0)
		59	#define expect_true(expr) expect ((expr) != 0, 1)
		60
		61	#define IN_RANGE_INC(type,val,beg,end) \
		62	((unsigned type)((unsigned type)(val) - (unsigned type)(beg)) \
		63	<= (unsigned type)((unsigned type)(end) - (unsigned type)(beg)))
		64
		65	#define ERR_NESTING_EXCEEDED "json text or perl structure exceeds maximum nesting level (max_depth set too low?)"
		66
		67	#ifdef USE_ITHREADS
		68	# define JSON_SLOW 1
		69	# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
		70	#else
		71	# define JSON_SLOW 0
		72	# define JSON_STASH json_stash
		73	#endif
		74
		75	static HV *json_stash, *json_boolean_stash; // JSON::XS::
		76	static SV *json_true, *json_false;
		77
		78	enum {
		79	INCR_M_WS = 0, // initial whitespace skipping, must be 0
		80	INCR_M_STR, // inside string
		81	INCR_M_BS, // inside backslash
		82	INCR_M_C0, // inside comment in initial whitespace sequence
		83	INCR_M_C1, // inside comment in other places
		84	INCR_M_JSON // outside anything, count nesting
		85	};
		86
		87	#define INCR_DONE(json) ((json)->incr_nest <= 0 && (json)->incr_mode == INCR_M_JSON)
		88
		89	typedef struct {
		90	U32 flags;
		91	U32 max_depth;
		92	STRLEN max_size;
		93
		94	SV *cb_object;
		95	HV *cb_sk_object;
		96
		97	// for the incremental parser
		98	SV *incr_text; // the source text so far
		99	STRLEN incr_pos; // the current offset into the text
		100	int incr_nest; // {[]}-nesting level
		101	unsigned char incr_mode;
		102	} JSON;
		103
		104	INLINE void
		105	json_init (JSON *json)
		106	{
		107	Zero (json, 1, JSON);
		108	json->max_depth = 512;
		109	}
		110
		111	/////////////////////////////////////////////////////////////////////////////
		112	// utility functions
		113
		114	INLINE SV *
		115	get_bool (const char *name)
		116	{
		117	SV *sv = get_sv (name, 1);
		118
		119	SvREADONLY_on (sv);
		120	SvREADONLY_on (SvRV (sv));
		121
		122	return sv;
		123	}
		124
		125	INLINE void
		126	shrink (SV *sv)
		127	{
		128	sv_utf8_downgrade (sv, 1);
		129
		130	if (SvLEN (sv) > SvCUR (sv) + 1)
		131	{
		132	#ifdef SvPV_shrink_to_cur
		133	SvPV_shrink_to_cur (sv);
		134	#elif defined (SvPV_renew)
		135	SvPV_renew (sv, SvCUR (sv) + 1);
		136	#endif
		137	}
		138	}
		139
		140	// decode an utf-8 character and return it, or (UV)-1 in
		141	// case of an error.
		142	// we special-case "safe" characters from U+80 .. U+7FF,
		143	// but use the very good perl function to parse anything else.
		144	// note that we never call this function for a ascii codepoints
		145	INLINE UV
		146	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
		147	{
		148	if (expect_true (len >= 2
		149	&& IN_RANGE_INC (char, s[0], 0xc2, 0xdf)
		150	&& IN_RANGE_INC (char, s[1], 0x80, 0xbf)))
		151	{
		152	*clen = 2;
		153	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
		154	}
		155	else
		156	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
		157	}
		158
		159	// likewise for encoding, also never called for ascii codepoints
		160	// this function takes advantage of this fact, although current gccs
		161	// seem to optimise the check for >= 0x80 away anyways
		162	INLINE unsigned char *
		163	encode_utf8 (unsigned char *s, UV ch)
		164	{
		165	if (expect_false (ch < 0x000080))
		166	*s++ = ch;
		167	else if (expect_true (ch < 0x000800))
		168	*s++ = 0xc0 | ( ch >> 6),
		169	*s++ = 0x80 | ( ch & 0x3f);
		170	else if ( ch < 0x010000)
		171	*s++ = 0xe0 | ( ch >> 12),
		172	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		173	*s++ = 0x80 | ( ch & 0x3f);
		174	else if ( ch < 0x110000)
		175	*s++ = 0xf0 | ( ch >> 18),
		176	*s++ = 0x80 | ((ch >> 12) & 0x3f),
		177	*s++ = 0x80 | ((ch >> 6) & 0x3f),
		178	*s++ = 0x80 | ( ch & 0x3f);
		179
		180	return s;
		181	}
		182
		183	// convert offset pointer to character index, sv must be string
		184	static STRLEN
		185	ptr_to_index (SV *sv, char *offset)
		186	{
		187	return SvUTF8 (sv)
		188	? utf8_distance (offset, SvPVX (sv))
		189	: offset - SvPVX (sv);
		190	}
		191
		192	/////////////////////////////////////////////////////////////////////////////
		193	// encoder
26		194
27	// structure used for encoding JSON	195	// structure used for encoding JSON
28	typedef struct	196	typedef struct
29	{	197	{
30	char *cur;	198	char *cur; // SvPVX (sv) + current output position
31	STRLEN len; // SvLEN (sv)
32	char *end; // SvEND (sv)	199	char *end; // SvEND (sv)
33	SV *sv;	200	SV *sv; // result scalar
34	UV flags;	201	JSON json;
35	int max_recurse;	202	U32 indent; // indentation level
36	int indent;	203	UV limit; // escape character values >= this value when encoding
37	} enc_t;	204	} enc_t;
38		205
39	// structure used for decoding JSON	206	INLINE void
40	typedef struct
41	{
42	char *cur;
43	char *end;
44	char *err;
45	UV flags;
46	} dec_t;
47
48	static UV *
49	SvJSON (SV *sv)
50	{
51	if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
52	croak ("object is not of type JSON::XS");
53
54	return &SvUVX (SvRV (sv));
55	}
56
57	/////////////////////////////////////////////////////////////////////////////
58
59	static void
60	need (enc_t *enc, STRLEN len)	207	need (enc_t *enc, STRLEN len)
61	{	208	{
62	if (enc->cur + len >= enc->end)	209	if (expect_false (enc->cur + len >= enc->end))
63	{	210	{
64	STRLEN cur = enc->cur - SvPVX (enc->sv);	211	STRLEN cur = enc->cur - (char *)SvPVX (enc->sv);
65	SvGROW (enc->sv, cur + len + 1);	212	SvGROW (enc->sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
66	enc->cur = SvPVX (enc->sv) + cur;	213	enc->cur = SvPVX (enc->sv) + cur;
67	enc->end = SvEND (enc->sv);	214	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
68	}	215	}
69	}	216	}
70		217
71	static void	218	INLINE void
72	encode_ch (enc_t *enc, char ch)	219	encode_ch (enc_t *enc, char ch)
73	{	220	{
74	need (enc, 1);	221	need (enc, 1);
75	*enc->cur++ = ch;	222	*enc->cur++ = ch;
76	}	223	}
…		…
78	static void	225	static void
79	encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8)	226	encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8)
80	{	227	{
81	char *end = str + len;	228	char *end = str + len;
82		229
		230	need (enc, len);
		231
83	while (str < end)	232	while (str < end)
84	{	233	{
85	unsigned char ch = *(unsigned char *)str;	234	unsigned char ch = *(unsigned char *)str;
		235
86	if (ch >= 0x20 && ch < 0x80) // most common case	236	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
87	{	237	{
		238	if (expect_false (ch == '"')) // but with slow exceptions
		239	{
		240	need (enc, len += 1);
		241	*enc->cur++ = '\\';
		242	*enc->cur++ = '"';
		243	}
		244	else if (expect_false (ch == '\\'))
		245	{
		246	need (enc, len += 1);
		247	*enc->cur++ = '\\';
		248	*enc->cur++ = '\\';
		249	}
		250	else
88	*enc->cur++ = ch;	251	*enc->cur++ = ch;
		252
89	str++;	253	++str;
90	}	254	}
91	else	255	else
92	{	256	{
93	STRLEN clen;	257	switch (ch)
94	UV uch;
95
96	if (is_utf8)
97	{	258	{
98	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);	259	case '\010': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
99	if (clen < 0)	260	case '\011': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
100	croak ("malformed UTF-8 character in string, cannot convert to JSON");	261	case '\012': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
101	}	262	case '\014': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
102	else	263	case '\015': need (enc, len += 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
103	{
104	uch = ch;
105	clen = 1;
106	}
107		264
108	need (enc, len += 6);	265	default:
109
110	if (uch < 0xa0 || enc->flags & F_ASCII)
111	{
112	if (uch > 0xFFFFUL)
113	{	266	{
		267	STRLEN clen;
		268	UV uch;
		269
		270	if (is_utf8)
		271	{
		272	uch = decode_utf8 (str, end - str, &clen);
		273	if (clen == (STRLEN)-1)
		274	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
		275	}
		276	else
		277	{
		278	uch = ch;
114	len += 6;	279	clen = 1;
		280	}
		281
		282	if (uch < 0x80/*0x20*/ || uch >= enc->limit)
		283	{
		284	if (uch >= 0x10000UL)
		285	{
		286	if (uch >= 0x110000UL)
		287	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		288
115	need (enc, len += 6);	289	need (enc, len += 11);
116	sprintf (enc->cur, "\\u%04x\\u%04x",	290	sprintf (enc->cur, "\\u%04x\\u%04x",
117	(uch - 0x10000) / 0x400 + 0xD800,	291	(int)((uch - 0x10000) / 0x400 + 0xD800),
118	(uch - 0x10000) % 0x400 + 0xDC00);	292	(int)((uch - 0x10000) % 0x400 + 0xDC00));
119	enc->cur += 12;	293	enc->cur += 12;
		294	}
		295	else
		296	{
		297	need (enc, len += 5);
		298	*enc->cur++ = '\\';
		299	*enc->cur++ = 'u';
		300	*enc->cur++ = PL_hexdigit [ uch >> 12 ];
		301	*enc->cur++ = PL_hexdigit [(uch >> 8) & 15];
		302	*enc->cur++ = PL_hexdigit [(uch >> 4) & 15];
		303	*enc->cur++ = PL_hexdigit [(uch >> 0) & 15];
		304	}
		305
		306	str += clen;
120	}	307	}
		308	else if (enc->json.flags & F_LATIN1)
		309	{
		310	*enc->cur++ = uch;
		311	str += clen;
		312	}
		313	else if (is_utf8)
		314	{
		315	need (enc, len += clen);
		316	do
		317	{
		318	*enc->cur++ = *str++;
		319	}
		320	while (--clen);
		321	}
121	else	322	else
122	{	323	{
123	sprintf (enc->cur, "\\u%04x", uch);	324	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
124	enc->cur += 6;	325	enc->cur = encode_utf8 (enc->cur, uch);
		326	++str;
		327	}
125	}	328	}
126	}	329	}
127	else if (is_utf8)
128	{
129	memcpy (enc->cur, str, clen);
130	enc->cur += clen;
131	}
132	else
133	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
134
135	str += clen;
136	}	330	}
137		331
138	--len;	332	--len;
139	}	333	}
140	}	334	}
141		335
142	#define INDENT SB \	336	INLINE void
		337	encode_indent (enc_t *enc)
		338	{
143	if (enc->flags & F_INDENT) \	339	if (enc->json.flags & F_INDENT)
144	{ \	340	{
145	int i_; \	341	int spaces = enc->indent * INDENT_STEP;
146	need (enc, enc->indent); \	342
147	for (i_ = enc->indent * 3; i_--; )\	343	need (enc, spaces);
		344	memset (enc->cur, ' ', spaces);
		345	enc->cur += spaces;
		346	}
		347	}
		348
		349	INLINE void
		350	encode_space (enc_t *enc)
		351	{
		352	need (enc, 1);
		353	encode_ch (enc, ' ');
		354	}
		355
		356	INLINE void
		357	encode_nl (enc_t *enc)
		358	{
		359	if (enc->json.flags & F_INDENT)
		360	{
		361	need (enc, 1);
148	encode_ch (enc, ' '); \	362	encode_ch (enc, '\n');
149	} \	363	}
150	SE	364	}
151		365
152	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	366	INLINE void
153	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	367	encode_comma (enc_t *enc)
154	#define COMMA SB \	368	{
155	encode_ch (enc, ','); \	369	encode_ch (enc, ',');
		370
156	if (enc->flags & F_INDENT) \	371	if (enc->json.flags & F_INDENT)
157	NL; \	372	encode_nl (enc);
158	else if (enc->flags & F_SPACE_AFTER) \	373	else if (enc->json.flags & F_SPACE_AFTER)
159	SPACE; \	374	encode_space (enc);
160	SE	375	}
161		376
162	static void encode_sv (enc_t *enc, SV *sv);	377	static void encode_sv (enc_t *enc, SV *sv);
163		378
164	static void	379	static void
165	encode_av (enc_t *enc, AV *av)	380	encode_av (enc_t *enc, AV *av)
166	{	381	{
167	int i, len = av_len (av);	382	int i, len = av_len (av);
168		383
		384	if (enc->indent >= enc->json.max_depth)
		385	croak (ERR_NESTING_EXCEEDED);
		386
169	encode_ch (enc, '['); NL;	387	encode_ch (enc, '[');
170	++enc->indent;	388
		389	if (len >= 0)
		390	{
		391	encode_nl (enc); ++enc->indent;
171		392
172	for (i = 0; i <= len; ++i)	393	for (i = 0; i <= len; ++i)
173	{	394	{
174	INDENT;	395	SV **svp = av_fetch (av, i, 0);
175	encode_sv (enc, *av_fetch (av, i, 0));
176		396
		397	encode_indent (enc);
		398
		399	if (svp)
		400	encode_sv (enc, *svp);
		401	else
		402	encode_str (enc, "null", 4, 0);
		403
177	if (i < len)	404	if (i < len)
178	COMMA;	405	encode_comma (enc);
179	}	406	}
180		407
181	NL;	408	encode_nl (enc); --enc->indent; encode_indent (enc);
182		409	}
183	--enc->indent;	410
184	INDENT; encode_ch (enc, ']');	411	encode_ch (enc, ']');
185	}	412	}
186		413
187	static void	414	static void
188	encode_he (enc_t *enc, HE *he)	415	encode_hk (enc_t *enc, HE *he)
189	{	416	{
190	encode_ch (enc, '"');	417	encode_ch (enc, '"');
191		418
192	if (HeKLEN (he) == HEf_SVKEY)	419	if (HeKLEN (he) == HEf_SVKEY)
193	{	420	{
194	SV *sv = HeSVKEY (he);	421	SV *sv = HeSVKEY (he);
195	STRLEN len;	422	STRLEN len;
		423	char *str;
		424
		425	SvGETMAGIC (sv);
196	char *str = SvPV (sv, len);	426	str = SvPV (sv, len);
197		427
198	encode_str (enc, str, len, SvUTF8 (sv));	428	encode_str (enc, str, len, SvUTF8 (sv));
199	}	429	}
200	else	430	else
201	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	431	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
202		432
203	encode_ch (enc, '"');	433	encode_ch (enc, '"');
204		434
205	if (enc->flags & F_SPACE_BEFORE) SPACE;	435	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
206	encode_ch (enc, ':');	436	encode_ch (enc, ':');
207	if (enc->flags & F_SPACE_AFTER ) SPACE;	437	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
208	encode_sv (enc, HeVAL (he));
209	}	438	}
210		439
211	// compare hash entries, used when all keys are bytestrings	440	// compare hash entries, used when all keys are bytestrings
212	static int	441	static int
213	he_cmp_fast (const void *a_, const void *b_)	442	he_cmp_fast (const void *a_, const void *b_)
…		…
218	HE *b = *(HE **)b_;	447	HE *b = *(HE **)b_;
219		448
220	STRLEN la = HeKLEN (a);	449	STRLEN la = HeKLEN (a);
221	STRLEN lb = HeKLEN (b);	450	STRLEN lb = HeKLEN (b);
222		451
223	if (!(cmp == memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	452	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
224	cmp = la < lb ? -1 : la == lb ? 0 : 1;	453	cmp = lb - la;
225		454
226	return cmp;	455	return cmp;
227	}	456	}
228		457
229	// compare hash entries, used when some keys are sv's or utf-x	458	// compare hash entries, used when some keys are sv's or utf-x
230	static int	459	static int
231	he_cmp_slow (const void *a, const void *b)	460	he_cmp_slow (const void *a, const void *b)
232	{	461	{
233	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	462	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
234	}	463	}
235		464
236	static void	465	static void
237	encode_hv (enc_t *enc, HV *hv)	466	encode_hv (enc_t *enc, HV *hv)
238	{	467	{
239	int count, i;	468	HE *he;
240		469
241	encode_ch (enc, '{'); NL; ++enc->indent;	470	if (enc->indent >= enc->json.max_depth)
		471	croak (ERR_NESTING_EXCEEDED);
242		472
243	if ((count = hv_iterinit (hv)))	473	encode_ch (enc, '{');
244	{	474
245	// for canonical output we have to sort by keys first	475	// for canonical output we have to sort by keys first
246	// actually, this is mostly due to the stupid so-called	476	// actually, this is mostly due to the stupid so-called
247	// security workaround added somewhere in 5.8.x.	477	// security workaround added somewhere in 5.8.x
248	// that randomises hash orderings	478	// that randomises hash orderings
249	if (enc->flags & F_CANONICAL)	479	if (enc->json.flags & F_CANONICAL && !SvRMAGICAL (hv))
		480	{
		481	int count = hv_iterinit (hv);
		482
		483	if (SvMAGICAL (hv))
250	{	484	{
251	HE *he, *hes [count];	485	// need to count by iterating. could improve by dynamically building the vector below
		486	// but I don't care for the speed of this special case.
		487	// note also that we will run into undefined behaviour when the two iterations
		488	// do not result in the same count, something I might care for in some later release.
		489
		490	count = 0;
		491	while (hv_iternext (hv))
		492	++count;
		493
		494	hv_iterinit (hv);
		495	}
		496
		497	if (count)
		498	{
252	int fast = 1;	499	int i, fast = 1;
		500	#if defined(__BORLANDC__) || defined(_MSC_VER)
		501	HE **hes = _alloca (count * sizeof (HE));
		502	#else
		503	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
		504	#endif
253		505
254	i = 0;	506	i = 0;
255	while ((he = hv_iternext (hv)))	507	while ((he = hv_iternext (hv)))
256	{	508	{
257	hes [i++] = he;	509	hes [i++] = he;
…		…
263		515
264	if (fast)	516	if (fast)
265	qsort (hes, count, sizeof (HE *), he_cmp_fast);	517	qsort (hes, count, sizeof (HE *), he_cmp_fast);
266	else	518	else
267	{	519	{
268	// hack to disable "use bytes"	520	// hack to forcefully disable "use bytes"
269	COP *oldcop = PL_curcop, cop;	521	COP cop = *PL_curcop;
270	cop.op_private = 0;	522	cop.op_private = 0;
		523
		524	ENTER;
		525	SAVETMPS;
		526
		527	SAVEVPTR (PL_curcop);
271	PL_curcop = &cop;	528	PL_curcop = &cop;
272		529
273	SAVETMPS;
274	qsort (hes, count, sizeof (HE *), he_cmp_slow);	530	qsort (hes, count, sizeof (HE *), he_cmp_slow);
		531
275	FREETMPS;	532	FREETMPS;
276		533	LEAVE;
277	PL_curcop = oldcop;
278	}	534	}
279		535
280	for (i = 0; i < count; ++i)	536	encode_nl (enc); ++enc->indent;
		537
		538	while (count--)
281	{	539	{
282	INDENT;	540	encode_indent (enc);
		541	he = hes [count];
283	encode_he (enc, hes [i]);	542	encode_hk (enc, he);
		543	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
284		544
285	if (i < count - 1)	545	if (count)
286	COMMA;	546	encode_comma (enc);
287	}	547	}
288		548
		549	encode_nl (enc); --enc->indent; encode_indent (enc);
		550	}
		551	}
		552	else
		553	{
		554	if (hv_iterinit (hv) || SvMAGICAL (hv))
		555	if ((he = hv_iternext (hv)))
289	NL;	556	{
		557	encode_nl (enc); ++enc->indent;
		558
		559	for (;;)
		560	{
		561	encode_indent (enc);
		562	encode_hk (enc, he);
		563	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
		564
		565	if (!(he = hv_iternext (hv)))
		566	break;
		567
		568	encode_comma (enc);
		569	}
		570
		571	encode_nl (enc); --enc->indent; encode_indent (enc);
		572	}
		573	}
		574
		575	encode_ch (enc, '}');
		576	}
		577
		578	// encode objects, arrays and special \0=false and \1=true values.
		579	static void
		580	encode_rv (enc_t *enc, SV *sv)
		581	{
		582	svtype svt;
		583
		584	SvGETMAGIC (sv);
		585	svt = SvTYPE (sv);
		586
		587	if (expect_false (SvOBJECT (sv)))
		588	{
		589	HV *stash = !JSON_SLOW || json_boolean_stash
		590	? json_boolean_stash
		591	: gv_stashpv ("JSON::XS::Boolean", 1);
		592
		593	if (SvSTASH (sv) == stash)
		594	{
		595	if (SvIV (sv))
		596	encode_str (enc, "true", 4, 0);
		597	else
		598	encode_str (enc, "false", 5, 0);
290	}	599	}
291	else	600	else
292	{	601	{
293	SV *sv;	602	#if 0
294	HE *he = hv_iternext (hv);	603	if (0 && sv_derived_from (rv, "JSON::Literal"))
295
296	for (;;)
297	{	604	{
298	INDENT;	605	// not yet
299	encode_he (enc, he);
300
301	if (!(he = hv_iternext (hv)))
302	break;
303
304	COMMA;
305	}	606	}
306		607	#endif
		608	if (enc->json.flags & F_CONV_BLESSED)
307	NL;	609	{
		610	// we re-bless the reference to get overload and other niceties right
		611	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
		612
		613	if (to_json)
		614	{
		615	dSP;
		616
		617	ENTER; SAVETMPS; PUSHMARK (SP);
		618	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		619
		620	// calling with G_SCALAR ensures that we always get a 1 return value
		621	PUTBACK;
		622	call_sv ((SV *)GvCV (to_json), G_SCALAR);
		623	SPAGAIN;
		624
		625	// catch this surprisingly common error
		626	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		627	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		628
		629	sv = POPs;
		630	PUTBACK;
		631
		632	encode_sv (enc, sv);
		633
		634	FREETMPS; LEAVE;
		635	}
		636	else if (enc->json.flags & F_ALLOW_BLESSED)
		637	encode_str (enc, "null", 4, 0);
		638	else
		639	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		640	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		641	}
		642	else if (enc->json.flags & F_ALLOW_BLESSED)
		643	encode_str (enc, "null", 4, 0);
		644	else
		645	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		646	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
308	}	647	}
309	}	648	}
		649	else if (svt == SVt_PVHV)
		650	encode_hv (enc, (HV *)sv);
		651	else if (svt == SVt_PVAV)
		652	encode_av (enc, (AV *)sv);
		653	else if (svt < SVt_PVAV)
		654	{
		655	STRLEN len = 0;
		656	char *pv = svt ? SvPV (sv, len) : 0;
310		657
311	--enc->indent; INDENT; encode_ch (enc, '}');	658	if (len == 1 && *pv == '1')
		659	encode_str (enc, "true", 4, 0);
		660	else if (len == 1 && *pv == '0')
		661	encode_str (enc, "false", 5, 0);
		662	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		663	encode_str (enc, "null", 4, 0);
		664	else
		665	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		666	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		667	}
		668	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		669	encode_str (enc, "null", 4, 0);
		670	else
		671	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		672	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
312	}	673	}
313		674
314	static void	675	static void
315	encode_sv (enc_t *enc, SV *sv)	676	encode_sv (enc_t *enc, SV *sv)
316	{	677	{
		678	SvGETMAGIC (sv);
		679
317	if (SvPOKp (sv))	680	if (SvPOKp (sv))
318	{	681	{
319	STRLEN len;	682	STRLEN len;
320	char *str = SvPV (sv, len);	683	char *str = SvPV (sv, len);
321	encode_ch (enc, '"');	684	encode_ch (enc, '"');
322	encode_str (enc, str, len, SvUTF8 (sv));	685	encode_str (enc, str, len, SvUTF8 (sv));
323	encode_ch (enc, '"');	686	encode_ch (enc, '"');
324	}	687	}
325	else if (SvNOKp (sv))	688	else if (SvNOKp (sv))
326	{	689	{
		690	// trust that perl will do the right thing w.r.t. JSON syntax.
327	need (enc, NV_DIG + 32);	691	need (enc, NV_DIG + 32);
328	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	692	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
329	enc->cur += strlen (enc->cur);	693	enc->cur += strlen (enc->cur);
330	}	694	}
331	else if (SvIOKp (sv))	695	else if (SvIOKp (sv))
332	{	696	{
		697	// we assume we can always read an IV as a UV and vice versa
		698	// we assume two's complement
		699	// we assume no aliasing issues in the union
		700	if (SvIsUV (sv) ? SvUVX (sv) <= 59000
		701	: SvIVX (sv) <= 59000 && SvIVX (sv) >= -59000)
		702	{
		703	// optimise the "small number case"
		704	// code will likely be branchless and use only a single multiplication
		705	// works for numbers up to 59074
		706	I32 i = SvIVX (sv);
		707	U32 u;
		708	char digit, nz = 0;
		709
333	need (enc, 64);	710	need (enc, 6);
		711
		712	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		713	u = i < 0 ? -i : i;
		714
		715	// convert to 4.28 fixed-point representation
		716	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		717
		718	// now output digit by digit, each time masking out the integer part
		719	// and multiplying by 5 while moving the decimal point one to the right,
		720	// resulting in a net multiplication by 10.
		721	// we always write the digit to memory but conditionally increment
		722	// the pointer, to enable the use of conditional move instructions.
		723	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffffUL) * 5;
		724	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffffUL) * 5;
		725	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffffUL) * 5;
		726	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffffUL) * 5;
		727	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		728	}
		729	else
		730	{
		731	// large integer, use the (rather slow) snprintf way.
		732	need (enc, IVUV_MAXCHARS);
334	enc->cur +=	733	enc->cur +=
335	SvIsUV(sv)	734	SvIsUV(sv)
336	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	735	? snprintf (enc->cur, IVUV_MAXCHARS, "%"UVuf, (UV)SvUVX (sv))
337	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	736	: snprintf (enc->cur, IVUV_MAXCHARS, "%"IVdf, (IV)SvIVX (sv));
		737	}
338	}	738	}
339	else if (SvROK (sv))	739	else if (SvROK (sv))
340	{	740	encode_rv (enc, SvRV (sv));
341	if (!--enc->max_recurse)	741	else if (!SvOK (sv) || enc->json.flags & F_ALLOW_UNKNOWN)
342	croak ("data structure too deep (hit recursion limit)");
343
344	sv = SvRV (sv);
345
346	switch (SvTYPE (sv))
347	{
348	case SVt_PVAV: encode_av (enc, (AV *)sv); break;
349	case SVt_PVHV: encode_hv (enc, (HV *)sv); break;
350
351	default:
352	croak ("JSON can only represent references to arrays or hashes");
353	}
354	}
355	else if (!SvOK (sv))
356	encode_str (enc, "null", 4, 0);	742	encode_str (enc, "null", 4, 0);
357	else	743	else
358	croak ("encountered perl type that JSON cannot handle");	744	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
		745	SvPV_nolen (sv), SvFLAGS (sv));
359	}	746	}
360		747
361	static SV *	748	static SV *
362	encode_json (SV *scalar, UV flags)	749	encode_json (SV *scalar, JSON *json)
363	{	750	{
364	enc_t enc;	751	enc_t enc;
365	enc.flags = flags;	752
		753	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
		754	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
		755
		756	enc.json = *json;
366	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	757	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
367	enc.cur = SvPVX (enc.sv);	758	enc.cur = SvPVX (enc.sv);
368	enc.end = SvEND (enc.sv);	759	enc.end = SvEND (enc.sv);
369	enc.max_recurse = 0;
370	enc.indent = 0;	760	enc.indent = 0;
		761	enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
		762	: enc.json.flags & F_LATIN1 ? 0x000100UL
		763	: 0x110000UL;
371		764
372	SvPOK_only (enc.sv);	765	SvPOK_only (enc.sv);
373	encode_sv (&enc, scalar);	766	encode_sv (&enc, scalar);
		767	encode_nl (&enc);
374		768
		769	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		770	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		771
375	if (!(flags & (F_ASCII | F_UTF8)))	772	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
376	SvUTF8_on (enc.sv);	773	SvUTF8_on (enc.sv);
377		774
378	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));	775	if (enc.json.flags & F_SHRINK)
		776	shrink (enc.sv);
		777
379	return enc.sv;	778	return enc.sv;
380	}	779	}
381		780
382	/////////////////////////////////////////////////////////////////////////////	781	/////////////////////////////////////////////////////////////////////////////
		782	// decoder
383		783
384	#define WS \	784	// structure used for decoding JSON
		785	typedef struct
		786	{
		787	char *cur; // current parser pointer
		788	char *end; // end of input string
		789	const char *err; // parse error, if != 0
		790	JSON json;
		791	U32 depth; // recursion depth
		792	U32 maxdepth; // recursion depth limit
		793	} dec_t;
		794
		795	INLINE void
		796	decode_comment (dec_t *dec)
		797	{
		798	// only '#'-style comments allowed a.t.m.
		799
		800	while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
		801	++dec->cur;
		802	}
		803
		804	INLINE void
		805	decode_ws (dec_t *dec)
		806	{
385	for (;;) \	807	for (;;)
386	{ \	808	{
387	char ch = *dec->cur; \	809	char ch = *dec->cur;
		810
388	if (ch > 0x20 \	811	if (ch > 0x20)
		812	{
		813	if (expect_false (ch == '#'))
		814	{
		815	if (dec->json.flags & F_RELAXED)
		816	decode_comment (dec);
		817	else
		818	break;
		819	}
		820	else
		821	break;
		822	}
389	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	823	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
390	break; \	824	break; // parse error, but let higher level handle it, gives better error messages
		825
391	++dec->cur; \	826	++dec->cur;
392	}	827	}
		828	}
393		829
394	#define ERR(reason) SB dec->err = reason; goto fail; SE	830	#define ERR(reason) SB dec->err = reason; goto fail; SE
		831
395	#define EXPECT_CH(ch) SB \	832	#define EXPECT_CH(ch) SB \
396	if (*dec->cur != ch) \	833	if (*dec->cur != ch) \
397	ERR (# ch " expected"); \	834	ERR (# ch " expected"); \
398	++dec->cur; \	835	++dec->cur; \
399	SE	836	SE
400		837
		838	#define DEC_INC_DEPTH if (++dec->depth > dec->json.max_depth) ERR (ERR_NESTING_EXCEEDED)
		839	#define DEC_DEC_DEPTH --dec->depth
		840
401	static SV *decode_sv (dec_t *dec);	841	static SV *decode_sv (dec_t *dec);
402
403	#define APPEND_CH(ch) SB \
404	SvGROW (sv, cur + 1 + 1); \
405	SvPVX (sv)[cur++] = (ch); \
406	SE
407		842
408	static signed char decode_hexdigit[256];	843	static signed char decode_hexdigit[256];
409		844
410	static UV	845	static UV
411	decode_4hex (dec_t *dec)	846	decode_4hex (dec_t *dec)
412	{	847	{
413	signed char d1, d2, d3, d4;	848	signed char d1, d2, d3, d4;
		849	unsigned char *cur = (unsigned char *)dec->cur;
414		850
415	d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]];	851	d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
416	if (d1 < 0) ERR ("four hexadecimal digits expected");	852	d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
417	d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]];	853	d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
418	if (d2 < 0) ERR ("four hexadecimal digits expected");	854	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
419	d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
420	if (d3 < 0) ERR ("four hexadecimal digits expected");
421	d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
422	if (d4 < 0) ERR ("four hexadecimal digits expected");
423		855
424	dec->cur += 4;	856	dec->cur += 4;
425		857
426	return ((UV)d1) << 12	858	return ((UV)d1) << 12
427	| ((UV)d2) << 8	859	| ((UV)d2) << 8
…		…
433	}	865	}
434		866
435	static SV *	867	static SV *
436	decode_str (dec_t *dec)	868	decode_str (dec_t *dec)
437	{	869	{
438	SV *sv = NEWSV (0,2);	870	SV *sv = 0;
439	STRLEN cur = 0;
440	int utf8 = 0;	871	int utf8 = 0;
		872	char *dec_cur = dec->cur;
441		873
442	for (;;)	874	do
443	{	875	{
444	unsigned char ch = *(unsigned char *)dec->cur;	876	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		877	char *cur = buf;
445		878
446	if (ch == '"')	879	do
447	break;
448	else if (ch == '\\')
449	{	880	{
450	switch (*++dec->cur)	881	unsigned char ch = *(unsigned char *)dec_cur++;
		882
		883	if (expect_false (ch == '"'))
451	{	884	{
452	case '\\':	885	--dec_cur;
453	case '/':	886	break;
454	case '"': APPEND_CH (*dec->cur++); break;	887	}
455		888	else if (expect_false (ch == '\\'))
456	case 'b': APPEND_CH ('\010'); ++dec->cur; break;	889	{
457	case 't': APPEND_CH ('\011'); ++dec->cur; break;	890	switch (*dec_cur)
458	case 'n': APPEND_CH ('\012'); ++dec->cur; break;
459	case 'f': APPEND_CH ('\014'); ++dec->cur; break;
460	case 'r': APPEND_CH ('\015'); ++dec->cur; break;
461
462	case 'u':
463	{	891	{
464	UV lo, hi;	892	case '\\':
465	++dec->cur;	893	case '/':
		894	case '"': *cur++ = *dec_cur++; break;
466		895
467	hi = decode_4hex (dec);	896	case 'b': ++dec_cur; *cur++ = '\010'; break;
468	if (hi == (UV)-1)	897	case 't': ++dec_cur; *cur++ = '\011'; break;
469	goto fail;	898	case 'n': ++dec_cur; *cur++ = '\012'; break;
		899	case 'f': ++dec_cur; *cur++ = '\014'; break;
		900	case 'r': ++dec_cur; *cur++ = '\015'; break;
470		901
471	// possibly a surrogate pair	902	case 'u':
472	if (hi >= 0xd800 && hi < 0xdc00)
473	{	903	{
474	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	904	UV lo, hi;
475	ERR ("illegal surrogate character");	905	++dec_cur;
476		906
477	dec->cur += 2;	907	dec->cur = dec_cur;
478
479	lo = decode_4hex (dec);	908	hi = decode_4hex (dec);
		909	dec_cur = dec->cur;
480	if (lo == (UV)-1)	910	if (hi == (UV)-1)
481	goto fail;	911	goto fail;
482		912
		913	// possibly a surrogate pair
		914	if (hi >= 0xd800)
		915	if (hi < 0xdc00)
		916	{
		917	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
		918	ERR ("missing low surrogate character in surrogate pair");
		919
		920	dec_cur += 2;
		921
		922	dec->cur = dec_cur;
		923	lo = decode_4hex (dec);
		924	dec_cur = dec->cur;
		925	if (lo == (UV)-1)
		926	goto fail;
		927
483	if (lo < 0xdc00 || lo >= 0xe000)	928	if (lo < 0xdc00 || lo >= 0xe000)
484	ERR ("surrogate pair expected");	929	ERR ("surrogate pair expected");
485		930
486	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;	931	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
		932	}
		933	else if (hi < 0xe000)
		934	ERR ("missing high surrogate character in surrogate pair");
		935
		936	if (hi >= 0x80)
		937	{
		938	utf8 = 1;
		939
		940	cur = encode_utf8 (cur, hi);
		941	}
		942	else
		943	*cur++ = hi;
487	}	944	}
488	else if (lo >= 0xdc00 && lo < 0xe000)
489	ERR ("illegal surrogate character");
490
491	if (hi >= 0x80)
492	{	945	break;
493	utf8 = 1;
494		946
495	SvGROW (sv, cur + 4 + 1); // at most 4 bytes for 21 bits
496	cur = (char *)uvuni_to_utf8_flags (SvPVX (sv) + cur, hi, 0) - SvPVX (sv);
497	}
498	else	947	default:
499	APPEND_CH (hi);	948	--dec_cur;
		949	ERR ("illegal backslash escape sequence in string");
500	}	950	}
		951	}
		952	else if (expect_true (ch >= 0x20 && ch < 0x80))
		953	*cur++ = ch;
		954	else if (ch >= 0x80)
		955	{
		956	STRLEN clen;
		957
		958	--dec_cur;
		959
		960	decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		961	if (clen == (STRLEN)-1)
		962	ERR ("malformed UTF-8 character in JSON string");
		963
		964	do
		965	*cur++ = *dec_cur++;
		966	while (--clen);
		967
		968	utf8 = 1;
		969	}
		970	else
		971	{
		972	--dec_cur;
		973
		974	if (!ch)
		975	ERR ("unexpected end of string while parsing JSON string");
501	break;	976	else
		977	ERR ("invalid character encountered while parsing JSON string");
502	}	978	}
503	}	979	}
504	else if (ch >= 0x20 && ch <= 0x7f)	980	while (cur < buf + SHORT_STRING_LEN);
505	APPEND_CH (*dec->cur++);	981
506	else if (ch >= 0x80)	982	{
		983	STRLEN len = cur - buf;
		984
		985	if (sv)
507	{	986	{
508	STRLEN clen;	987	STRLEN cur = SvCUR (sv);
509	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
510	if (clen < 0)
511	ERR ("malformed UTF-8 character in string, cannot convert to JSON");
512		988
513	SvGROW (sv, cur + clen + 1); // at most 4 bytes for 21 bits	989	if (SvLEN (sv) <= cur + len)
514	memcpy (SvPVX (sv) + cur, dec->cur, clen);	990	SvGROW (sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
515	dec->cur += clen;	991
		992	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
		993	SvCUR_set (sv, SvCUR (sv) + len);
516	}	994	}
517	else	995	else
518	ERR ("invalid character encountered");	996	sv = newSVpvn (buf, len);
519	}	997	}
		998	}
		999	while (*dec_cur != '"');
520		1000
521	++dec->cur;	1001	++dec_cur;
522		1002
		1003	if (sv)
		1004	{
523	SvPOK_only (sv);	1005	SvPOK_only (sv);
524
525	SvCUR_set (sv, cur);
526	*SvEND (sv) = 0;	1006	*SvEND (sv) = 0;
527		1007
528	if (utf8)	1008	if (utf8)
529	SvUTF8_on (sv);	1009	SvUTF8_on (sv);
		1010	}
		1011	else
		1012	sv = newSVpvn ("", 0);
530		1013
		1014	dec->cur = dec_cur;
531	return sv;	1015	return sv;
532		1016
533	fail:	1017	fail:
534	SvREFCNT_dec (sv);	1018	dec->cur = dec_cur;
535	return 0;	1019	return 0;
536	}	1020	}
537		1021
538	static SV *	1022	static SV *
539	decode_num (dec_t *dec)	1023	decode_num (dec_t *dec)
…		…
549	{	1033	{
550	++dec->cur;	1034	++dec->cur;
551	if (*dec->cur >= '0' && *dec->cur <= '9')	1035	if (*dec->cur >= '0' && *dec->cur <= '9')
552	ERR ("malformed number (leading zero must not be followed by another digit)");	1036	ERR ("malformed number (leading zero must not be followed by another digit)");
553	}	1037	}
554		1038	else if (*dec->cur < '0' || *dec->cur > '9')
555	// int	1039	ERR ("malformed number (no digits after initial minus)");
		1040	else
		1041	do
		1042	{
		1043	++dec->cur;
		1044	}
556	while (*dec->cur >= '0' && *dec->cur <= '9')	1045	while (*dec->cur >= '0' && *dec->cur <= '9');
557	++dec->cur;
558		1046
559	// [frac]	1047	// [frac]
560	if (*dec->cur == '.')	1048	if (*dec->cur == '.')
561	{	1049	{
562	is_nv = 1;	1050	++dec->cur;
		1051
		1052	if (*dec->cur < '0' || *dec->cur > '9')
		1053	ERR ("malformed number (no digits after decimal point)");
563		1054
564	do	1055	do
565	{	1056	{
566	++dec->cur;	1057	++dec->cur;
567	}	1058	}
568	while (*dec->cur >= '0' && *dec->cur <= '9');	1059	while (*dec->cur >= '0' && *dec->cur <= '9');
		1060
		1061	is_nv = 1;
569	}	1062	}
570		1063
571	// [exp]	1064	// [exp]
572	if (*dec->cur == 'e' || *dec->cur == 'E')	1065	if (*dec->cur == 'e' || *dec->cur == 'E')
573	{	1066	{
574	is_nv = 1;
575
576	++dec->cur;	1067	++dec->cur;
		1068
577	if (*dec->cur == '-' || *dec->cur == '+')	1069	if (*dec->cur == '-' || *dec->cur == '+')
578	++dec->cur;	1070	++dec->cur;
579		1071
		1072	if (*dec->cur < '0' || *dec->cur > '9')
		1073	ERR ("malformed number (no digits after exp sign)");
		1074
		1075	do
		1076	{
		1077	++dec->cur;
		1078	}
580	while (*dec->cur >= '0' && *dec->cur <= '9')	1079	while (*dec->cur >= '0' && *dec->cur <= '9');
581	++dec->cur;	1080
		1081	is_nv = 1;
582	}	1082	}
583		1083
584	if (!is_nv)	1084	if (!is_nv)
585	{	1085	{
586	UV uv;	1086	int len = dec->cur - start;
587	int numtype = grok_number (start, dec->cur - start, &uv);	1087
588	if (numtype & IS_NUMBER_IN_UV)	1088	// special case the rather common 1..5-digit-int case
589	if (numtype & IS_NUMBER_NEG)	1089	if (*start == '-')
		1090	switch (len)
590	{	1091	{
591	if (uv < (UV)IV_MIN)	1092	case 2: return newSViv (-(IV)( start [1] - '0' * 1));
592	return newSViv (-(IV)uv);	1093	case 3: return newSViv (-(IV)( start [1] * 10 + start [2] - '0' * 11));
		1094	case 4: return newSViv (-(IV)( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		1095	case 5: return newSViv (-(IV)( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
		1096	case 6: return newSViv (-(IV)(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
593	}	1097	}
		1098	else
		1099	switch (len)
		1100	{
		1101	case 1: return newSViv ( start [0] - '0' * 1);
		1102	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1103	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1104	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1105	case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
		1106	}
		1107
		1108	{
		1109	UV uv;
		1110	int numtype = grok_number (start, len, &uv);
		1111	if (numtype & IS_NUMBER_IN_UV)
		1112	if (numtype & IS_NUMBER_NEG)
		1113	{
		1114	if (uv < (UV)IV_MIN)
		1115	return newSViv (-(IV)uv);
		1116	}
594	else	1117	else
595	return newSVuv (uv);	1118	return newSVuv (uv);
596	}	1119	}
597		1120
		1121	len -= *start == '-' ? 1 : 0;
		1122
		1123	// does not fit into IV or UV, try NV
		1124	if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len)
		1125	#if defined (LDBL_DIG)
		1126	|| (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len)
		1127	#endif
		1128	)
		1129	// fits into NV without loss of precision
		1130	return newSVnv (Atof (start));
		1131
		1132	// everything else fails, convert it to a string
		1133	return newSVpvn (start, dec->cur - start);
		1134	}
		1135
		1136	// loss of precision here
598	return newSVnv (Atof (start));	1137	return newSVnv (Atof (start));
599		1138
600	fail:	1139	fail:
601	return 0;	1140	return 0;
602	}	1141	}
…		…
604	static SV *	1143	static SV *
605	decode_av (dec_t *dec)	1144	decode_av (dec_t *dec)
606	{	1145	{
607	AV *av = newAV ();	1146	AV *av = newAV ();
608		1147
		1148	DEC_INC_DEPTH;
		1149	decode_ws (dec);
		1150
		1151	if (*dec->cur == ']')
		1152	++dec->cur;
		1153	else
609	for (;;)	1154	for (;;)
610	{	1155	{
611	SV *value;	1156	SV *value;
612		1157
613	value = decode_sv (dec);	1158	value = decode_sv (dec);
614	if (!value)	1159	if (!value)
615	goto fail;	1160	goto fail;
616		1161
617	av_push (av, value);	1162	av_push (av, value);
618		1163
619	WS;	1164	decode_ws (dec);
620		1165
621	if (*dec->cur == ']')	1166	if (*dec->cur == ']')
622	{	1167	{
623	++dec->cur;	1168	++dec->cur;
624	break;	1169	break;
		1170	}
625	}	1171
626
627	if (*dec->cur != ',')	1172	if (*dec->cur != ',')
628	ERR (", or ] expected while parsing array");	1173	ERR (", or ] expected while parsing array");
629		1174
630	++dec->cur;	1175	++dec->cur;
		1176
		1177	decode_ws (dec);
		1178
		1179	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1180	{
		1181	++dec->cur;
		1182	break;
		1183	}
631	}	1184	}
632		1185
		1186	DEC_DEC_DEPTH;
633	return newRV_noinc ((SV *)av);	1187	return newRV_noinc ((SV *)av);
634		1188
635	fail:	1189	fail:
636	SvREFCNT_dec (av);	1190	SvREFCNT_dec (av);
		1191	DEC_DEC_DEPTH;
637	return 0;	1192	return 0;
638	}	1193	}
639		1194
640	static SV *	1195	static SV *
641	decode_hv (dec_t *dec)	1196	decode_hv (dec_t *dec)
642	{	1197	{
		1198	SV *sv;
643	HV *hv = newHV ();	1199	HV *hv = newHV ();
644		1200
		1201	DEC_INC_DEPTH;
		1202	decode_ws (dec);
		1203
		1204	if (*dec->cur == '}')
		1205	++dec->cur;
		1206	else
645	for (;;)	1207	for (;;)
646	{	1208	{
647	SV *key, *value;
648
649	WS; EXPECT_CH ('"');	1209	EXPECT_CH ('"');
650		1210
651	key = decode_str (dec);	1211	// heuristic: assume that
652	if (!key)	1212	// a) decode_str + hv_store_ent are abysmally slow.
653	goto fail;	1213	// b) most hash keys are short, simple ascii text.
654		1214	// => try to "fast-match" such strings to avoid
655	WS; EXPECT_CH (':');	1215	// the overhead of decode_str + hv_store_ent.
656
657	value = decode_sv (dec);
658	if (!value)
659	{	1216	{
		1217	SV *value;
		1218	char *p = dec->cur;
		1219	char *e = p + 24; // only try up to 24 bytes
		1220
		1221	for (;;)
		1222	{
		1223	// the >= 0x80 is false on most architectures
		1224	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1225	{
		1226	// slow path, back up and use decode_str
		1227	SV *key = decode_str (dec);
		1228	if (!key)
		1229	goto fail;
		1230
		1231	decode_ws (dec); EXPECT_CH (':');
		1232
		1233	decode_ws (dec);
		1234	value = decode_sv (dec);
		1235	if (!value)
		1236	{
		1237	SvREFCNT_dec (key);
		1238	goto fail;
		1239	}
		1240
		1241	hv_store_ent (hv, key, value, 0);
660	SvREFCNT_dec (key);	1242	SvREFCNT_dec (key);
		1243
		1244	break;
		1245	}
		1246	else if (*p == '"')
		1247	{
		1248	// fast path, got a simple key
		1249	char *key = dec->cur;
		1250	int len = p - key;
		1251	dec->cur = p + 1;
		1252
		1253	decode_ws (dec); EXPECT_CH (':');
		1254
		1255	decode_ws (dec);
		1256	value = decode_sv (dec);
		1257	if (!value)
661	goto fail;	1258	goto fail;
		1259
		1260	hv_store (hv, key, len, value, 0);
		1261
		1262	break;
		1263	}
		1264
		1265	++p;
		1266	}
662	}	1267	}
663		1268
664	//TODO: optimise	1269	decode_ws (dec);
665	hv_store_ent (hv, key, value, 0);
666		1270
667	WS;
668
669	if (*dec->cur == '}')	1271	if (*dec->cur == '}')
		1272	{
		1273	++dec->cur;
		1274	break;
		1275	}
		1276
		1277	if (*dec->cur != ',')
		1278	ERR (", or } expected while parsing object/hash");
		1279
		1280	++dec->cur;
		1281
		1282	decode_ws (dec);
		1283
		1284	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1285	{
		1286	++dec->cur;
		1287	break;
		1288	}
		1289	}
		1290
		1291	DEC_DEC_DEPTH;
		1292	sv = newRV_noinc ((SV *)hv);
		1293
		1294	// check filter callbacks
		1295	if (dec->json.flags & F_HOOK)
		1296	{
		1297	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
670	{	1298	{
671	++dec->cur;	1299	HE *cb, *he;
672	break;	1300
		1301	hv_iterinit (hv);
		1302	he = hv_iternext (hv);
		1303	hv_iterinit (hv);
		1304
		1305	// the next line creates a mortal sv each time its called.
		1306	// might want to optimise this for common cases.
		1307	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1308
		1309	if (cb)
		1310	{
		1311	dSP;
		1312	int count;
		1313
		1314	ENTER; SAVETMPS; PUSHMARK (SP);
		1315	XPUSHs (HeVAL (he));
		1316
		1317	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1318
		1319	if (count == 1)
		1320	{
		1321	sv = newSVsv (POPs);
		1322	FREETMPS; LEAVE;
		1323	return sv;
		1324	}
		1325
		1326	FREETMPS; LEAVE;
		1327	}
673	}	1328	}
674		1329
675	if (*dec->cur != ',')	1330	if (dec->json.cb_object)
676	ERR (", or } expected while parsing object/hash");	1331	{
		1332	dSP;
		1333	int count;
677		1334
678	++dec->cur;	1335	ENTER; SAVETMPS; PUSHMARK (SP);
679	}	1336	XPUSHs (sv_2mortal (sv));
680		1337
681	return newRV_noinc ((SV *)hv);	1338	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1339
		1340	if (count == 1)
		1341	{
		1342	sv = newSVsv (POPs);
		1343	FREETMPS; LEAVE;
		1344	return sv;
		1345	}
		1346
		1347	SvREFCNT_inc (sv);
		1348	FREETMPS; LEAVE;
		1349	}
		1350	}
		1351
		1352	return sv;
682		1353
683	fail:	1354	fail:
684	SvREFCNT_dec (hv);	1355	SvREFCNT_dec (hv);
		1356	DEC_DEC_DEPTH;
685	return 0;	1357	return 0;
686	}	1358	}
687		1359
688	static SV *	1360	static SV *
689	decode_sv (dec_t *dec)	1361	decode_sv (dec_t *dec)
690	{	1362	{
691	WS;	1363	// the beauty of JSON: you need exactly one character lookahead
		1364	// to parse everything.
692	switch (*dec->cur)	1365	switch (*dec->cur)
693	{	1366	{
694	case '"': ++dec->cur; return decode_str (dec);	1367	case '"': ++dec->cur; return decode_str (dec);
695	case '[': ++dec->cur; return decode_av (dec);	1368	case '[': ++dec->cur; return decode_av (dec);
696	case '{': ++dec->cur; return decode_hv (dec);	1369	case '{': ++dec->cur; return decode_hv (dec);
697		1370
698	case '-':	1371	case '-':
699	case '0': case '1': case '2': case '3': case '4':	1372	case '0': case '1': case '2': case '3': case '4':
700	case '5': case '6': case '7': case '8': case '9':	1373	case '5': case '6': case '7': case '8': case '9':
701	return decode_num (dec);	1374	return decode_num (dec);
702		1375
703	case 't':	1376	case 't':
704	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1377	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
705	{	1378	{
706	dec->cur += 4;	1379	dec->cur += 4;
		1380	#if JSON_SLOW
		1381	json_true = get_bool ("JSON::XS::true");
		1382	#endif
707	return newSViv (1);	1383	return newSVsv (json_true);
708	}	1384	}
709	else	1385	else
710	ERR ("'true' expected");	1386	ERR ("'true' expected");
711		1387
712	break;	1388	break;
713		1389
714	case 'f':	1390	case 'f':
715	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1391	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
716	{	1392	{
717	dec->cur += 5;	1393	dec->cur += 5;
		1394	#if JSON_SLOW
		1395	json_false = get_bool ("JSON::XS::false");
		1396	#endif
718	return newSViv (0);	1397	return newSVsv (json_false);
719	}	1398	}
720	else	1399	else
721	ERR ("'false' expected");	1400	ERR ("'false' expected");
722		1401
723	break;	1402	break;
724		1403
725	case 'n':	1404	case 'n':
726	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))	1405	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))
727	{	1406	{
728	dec->cur += 4;	1407	dec->cur += 4;
729	return newSViv (1);	1408	return newSVsv (&PL_sv_undef);
730	}	1409	}
731	else	1410	else
732	ERR ("'null' expected");	1411	ERR ("'null' expected");
733		1412
734	break;	1413	break;
735		1414
736	default:	1415	default:
737	ERR ("malformed json string");	1416	ERR ("malformed JSON string, neither array, object, number, string or atom");
738	break;	1417	break;
739	}	1418	}
740		1419
741	fail:	1420	fail:
742	return 0;	1421	return 0;
743	}	1422	}
744		1423
745	static SV *	1424	static SV *
746	decode_json (SV *string, UV flags)	1425	decode_json (SV *string, JSON *json, char **offset_return)
747	{	1426	{
		1427	dec_t dec;
748	SV *sv;	1428	SV *sv;
749		1429
		1430	/* work around bugs in 5.10 where manipulating magic values
		1431	* will perl ignore the magic in subsequent accesses
		1432	*/
		1433	/*SvGETMAGIC (string);*/
		1434	if (SvMAGICAL (string))
		1435	string = sv_2mortal (newSVsv (string));
		1436
		1437	SvUPGRADE (string, SVt_PV);
		1438
		1439	/* work around a bug in perl 5.10, which causes SvCUR to fail an
		1440	* assertion with -DDEBUGGING, although SvCUR is documented to
		1441	* return the xpv_cur field which certainly exists after upgrading.
		1442	* according to nicholas clark, calling SvPOK fixes this.
		1443	* But it doesn't fix it, so try another workaround, call SvPV_nolen
		1444	* and hope for the best.
		1445	* Damnit, SvPV_nolen still trips over yet another assertion. This
		1446	* assertion business is seriously broken, try yet another workaround
		1447	* for the broken -DDEBUGGING.
		1448	*/
		1449	{
		1450	#ifdef DEBUGGING
		1451	STRLEN offset = SvOK (string) ? sv_len (string) : 0;
		1452	#else
		1453	STRLEN offset = SvCUR (string);
		1454	#endif
		1455
		1456	if (offset > json->max_size && json->max_size)
		1457	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1458	(unsigned long)SvCUR (string), (unsigned long)json->max_size);
		1459	}
		1460
750	if (!(flags & F_UTF8))	1461	if (json->flags & F_UTF8)
		1462	sv_utf8_downgrade (string, 0);
		1463	else
751	sv_utf8_upgrade (string);	1464	sv_utf8_upgrade (string);
752		1465
753	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1466	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
754		1467
755	dec_t dec;	1468	dec.json = *json;
756	dec.flags = flags;
757	dec.cur = SvPVX (string);	1469	dec.cur = SvPVX (string);
758	dec.end = SvEND (string);	1470	dec.end = SvEND (string);
759	dec.err = 0;	1471	dec.err = 0;
		1472	dec.depth = 0;
760		1473
761	*dec.end = 1; // invalid anywhere	1474	if (dec.json.cb_object || dec.json.cb_sk_object)
		1475	dec.json.flags |= F_HOOK;
		1476
		1477	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1478
		1479	decode_ws (&dec);
762	sv = decode_sv (&dec);	1480	sv = decode_sv (&dec);
763	*dec.end = 0;	1481
		1482	if (offset_return)
		1483	*offset_return = dec.cur;
		1484
		1485	if (!(offset_return || !sv))
		1486	{
		1487	// check for trailing garbage
		1488	decode_ws (&dec);
		1489
		1490	if (*dec.cur)
		1491	{
		1492	dec.err = "garbage after JSON object";
		1493	SvREFCNT_dec (sv);
		1494	sv = 0;
		1495	}
		1496	}
764		1497
765	if (!sv)	1498	if (!sv)
766	{	1499	{
767	IV offset = utf8_distance (dec.cur, SvPVX (string));
768	SV *uni = sv_newmortal ();	1500	SV *uni = sv_newmortal ();
769		1501
		1502	// horrible hack to silence warning inside pv_uni_display
		1503	COP cop = *PL_curcop;
		1504	cop.cop_warnings = pWARN_NONE;
		1505	ENTER;
		1506	SAVEVPTR (PL_curcop);
		1507	PL_curcop = &cop;
770	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1508	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
		1509	LEAVE;
		1510
771	croak ("%s, at character %d (%s)",	1511	croak ("%s, at character offset %d (before \"%s\")",
772	dec.err,	1512	dec.err,
773	(int)offset,	1513	ptr_to_index (string, dec.cur),
774	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1514	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
775	}	1515	}
776		1516
777	sv_dump (sv);//D
778	return sv_2mortal (sv);	1517	sv = sv_2mortal (sv);
		1518
		1519	if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
		1520	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
		1521
		1522	return sv;
779	}	1523	}
		1524
		1525	/////////////////////////////////////////////////////////////////////////////
		1526	// incremental parser
		1527
		1528	static void
		1529	incr_parse (JSON *self)
		1530	{
		1531	const char *p = SvPVX (self->incr_text) + self->incr_pos;
		1532
		1533	// the state machine here is a bit convoluted and could be simplified a lot
		1534	// but this would make it slower, so...
		1535
		1536	for (;;)
		1537	{
		1538	//printf ("loop pod %d *p<%c><%s>, mode %d nest %d\n", p - SvPVX (self->incr_text), *p, p, self->incr_mode, self->incr_nest);//D
		1539	switch (self->incr_mode)
		1540	{
		1541	// only used for initial whitespace skipping
		1542	case INCR_M_WS:
		1543	for (;;)
		1544	{
		1545	if (*p > 0x20)
		1546	{
		1547	if (*p == '#')
		1548	{
		1549	self->incr_mode = INCR_M_C0;
		1550	goto incr_m_c;
		1551	}
		1552	else
		1553	{
		1554	self->incr_mode = INCR_M_JSON;
		1555	goto incr_m_json;
		1556	}
		1557	}
		1558	else if (!*p)
		1559	goto interrupt;
		1560
		1561	++p;
		1562	}
		1563
		1564	// skip a single char inside a string (for \\-processing)
		1565	case INCR_M_BS:
		1566	if (!*p)
		1567	goto interrupt;
		1568
		1569	++p;
		1570	self->incr_mode = INCR_M_STR;
		1571	goto incr_m_str;
		1572
		1573	// inside #-style comments
		1574	case INCR_M_C0:
		1575	case INCR_M_C1:
		1576	incr_m_c:
		1577	for (;;)
		1578	{
		1579	if (*p == '\n')
		1580	{
		1581	self->incr_mode = self->incr_mode == INCR_M_C0 ? INCR_M_WS : INCR_M_JSON;
		1582	break;
		1583	}
		1584	else if (!*p)
		1585	goto interrupt;
		1586
		1587	++p;
		1588	}
		1589
		1590	break;
		1591
		1592	// inside a string
		1593	case INCR_M_STR:
		1594	incr_m_str:
		1595	for (;;)
		1596	{
		1597	if (*p == '"')
		1598	{
		1599	++p;
		1600	self->incr_mode = INCR_M_JSON;
		1601
		1602	if (!self->incr_nest)
		1603	goto interrupt;
		1604
		1605	goto incr_m_json;
		1606	}
		1607	else if (*p == '\\')
		1608	{
		1609	++p; // "virtually" consumes character after \
		1610
		1611	if (!*p) // if at end of string we have to switch modes
		1612	{
		1613	self->incr_mode = INCR_M_BS;
		1614	goto interrupt;
		1615	}
		1616	}
		1617	else if (!*p)
		1618	goto interrupt;
		1619
		1620	++p;
		1621	}
		1622
		1623	// after initial ws, outside string
		1624	case INCR_M_JSON:
		1625	incr_m_json:
		1626	for (;;)
		1627	{
		1628	switch (*p++)
		1629	{
		1630	case 0:
		1631	--p;
		1632	goto interrupt;
		1633
		1634	case 0x09:
		1635	case 0x0a:
		1636	case 0x0d:
		1637	case 0x20:
		1638	if (!self->incr_nest)
		1639	{
		1640	--p; // do not eat the whitespace, let the next round do it
		1641	goto interrupt;
		1642	}
		1643	break;
		1644
		1645	case '"':
		1646	self->incr_mode = INCR_M_STR;
		1647	goto incr_m_str;
		1648
		1649	case '[':
		1650	case '{':
		1651	if (++self->incr_nest > self->max_depth)
		1652	croak (ERR_NESTING_EXCEEDED);
		1653	break;
		1654
		1655	case ']':
		1656	case '}':
		1657	if (--self->incr_nest <= 0)
		1658	goto interrupt;
		1659	break;
		1660
		1661	case '#':
		1662	self->incr_mode = INCR_M_C1;
		1663	goto incr_m_c;
		1664	}
		1665	}
		1666	}
		1667
		1668	modechange:
		1669	;
		1670	}
		1671
		1672	interrupt:
		1673	self->incr_pos = p - SvPVX (self->incr_text);
		1674	//printf ("interrupt<%.*s>\n", self->incr_pos, SvPVX(self->incr_text));//D
		1675	//printf ("return pos %d mode %d nest %d\n", self->incr_pos, self->incr_mode, self->incr_nest);//D
		1676	}
		1677
		1678	/////////////////////////////////////////////////////////////////////////////
		1679	// XS interface functions
780		1680
781	MODULE = JSON::XS PACKAGE = JSON::XS	1681	MODULE = JSON::XS PACKAGE = JSON::XS
782		1682
783	BOOT:	1683	BOOT:
784	{	1684	{
785	int i;	1685	int i;
786		1686
787	memset (decode_hexdigit, 0xff, 256);
788	for (i = 10; i--; )	1687	for (i = 0; i < 256; ++i)
789	decode_hexdigit ['0' + i] = i;	1688	decode_hexdigit [i] =
		1689	i >= '0' && i <= '9' ? i - '0'
		1690	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1691	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1692	: -1;
790		1693
791	for (i = 6; --i; )
792	{
793	decode_hexdigit ['a' + i] = 10 + i;
794	decode_hexdigit ['A' + i] = 10 + i;
795	}
796
797	json_stash = gv_stashpv ("JSON::XS", 1);	1694	json_stash = gv_stashpv ("JSON::XS" , 1);
798	}	1695	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
799		1696
800	SV *new (char *dummy)	1697	json_true = get_bool ("JSON::XS::true");
		1698	json_false = get_bool ("JSON::XS::false");
		1699
		1700	CvNODEBUG_on (get_cv ("JSON::XS::incr_text", 0)); /* the debugger completely breaks lvalue subs */
		1701	}
		1702
		1703	PROTOTYPES: DISABLE
		1704
		1705	void CLONE (...)
801	CODE:	1706	CODE:
802	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1707	json_stash = 0;
		1708	json_boolean_stash = 0;
		1709
		1710	void new (char *klass)
		1711	PPCODE:
		1712	{
		1713	SV *pv = NEWSV (0, sizeof (JSON));
		1714	SvPOK_only (pv);
		1715	json_init ((JSON *)SvPVX (pv));
		1716	XPUSHs (sv_2mortal (sv_bless (
		1717	newRV_noinc (pv),
		1718	strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
		1719	)));
		1720	}
		1721
		1722	void ascii (JSON *self, int enable = 1)
		1723	ALIAS:
		1724	ascii = F_ASCII
		1725	latin1 = F_LATIN1
		1726	utf8 = F_UTF8
		1727	indent = F_INDENT
		1728	canonical = F_CANONICAL
		1729	space_before = F_SPACE_BEFORE
		1730	space_after = F_SPACE_AFTER
		1731	pretty = F_PRETTY
		1732	allow_nonref = F_ALLOW_NONREF
		1733	shrink = F_SHRINK
		1734	allow_blessed = F_ALLOW_BLESSED
		1735	convert_blessed = F_CONV_BLESSED
		1736	relaxed = F_RELAXED
		1737	allow_unknown = F_ALLOW_UNKNOWN
		1738	PPCODE:
		1739	{
		1740	if (enable)
		1741	self->flags |= ix;
		1742	else
		1743	self->flags &= ~ix;
		1744
		1745	XPUSHs (ST (0));
		1746	}
		1747
		1748	void get_ascii (JSON *self)
		1749	ALIAS:
		1750	get_ascii = F_ASCII
		1751	get_latin1 = F_LATIN1
		1752	get_utf8 = F_UTF8
		1753	get_indent = F_INDENT
		1754	get_canonical = F_CANONICAL
		1755	get_space_before = F_SPACE_BEFORE
		1756	get_space_after = F_SPACE_AFTER
		1757	get_allow_nonref = F_ALLOW_NONREF
		1758	get_shrink = F_SHRINK
		1759	get_allow_blessed = F_ALLOW_BLESSED
		1760	get_convert_blessed = F_CONV_BLESSED
		1761	get_relaxed = F_RELAXED
		1762	get_allow_unknown = F_ALLOW_UNKNOWN
		1763	PPCODE:
		1764	XPUSHs (boolSV (self->flags & ix));
		1765
		1766	void max_depth (JSON *self, U32 max_depth = 0x80000000UL)
		1767	PPCODE:
		1768	self->max_depth = max_depth;
		1769	XPUSHs (ST (0));
		1770
		1771	U32 get_max_depth (JSON *self)
		1772	CODE:
		1773	RETVAL = self->max_depth;
803	OUTPUT:	1774	OUTPUT:
804	RETVAL	1775	RETVAL
805		1776
806	SV *ascii (SV *self, int enable)	1777	void max_size (JSON *self, U32 max_size = 0)
807	ALIAS:	1778	PPCODE:
808	ascii = F_ASCII	1779	self->max_size = max_size;
809	utf8 = F_UTF8	1780	XPUSHs (ST (0));
810	indent = F_INDENT	1781
811	canonical = F_CANONICAL	1782	int get_max_size (JSON *self)
812	space_before = F_SPACE_BEFORE
813	space_after = F_SPACE_AFTER
814	json_rpc = F_JSON_RPC
815	pretty = F_PRETTY
816	CODE:	1783	CODE:
817	{	1784	RETVAL = self->max_size;
818	UV *uv = SvJSON (self);
819	if (enable)
820	*uv |= ix;
821	else
822	*uv &= ~ix;
823
824	RETVAL = newSVsv (self);
825	}
826	OUTPUT:	1785	OUTPUT:
827	RETVAL	1786	RETVAL
828		1787
829	void encode (SV *self, SV *scalar)	1788	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
830	PPCODE:	1789	PPCODE:
831	XPUSHs (encode_json (scalar, *SvJSON (self)));	1790	{
		1791	SvREFCNT_dec (self->cb_object);
		1792	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
832		1793
833	void decode (SV *self, SV *jsonstr)	1794	XPUSHs (ST (0));
		1795	}
		1796
		1797	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
834	PPCODE:	1798	PPCODE:
835	XPUSHs (decode_json (jsonstr, *SvJSON (self)));	1799	{
		1800	if (!self->cb_sk_object)
		1801	self->cb_sk_object = newHV ();
836		1802
837	void to_json (SV *scalar)	1803	if (SvOK (cb))
		1804	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1805	else
		1806	{
		1807	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
		1808
		1809	if (!HvKEYS (self->cb_sk_object))
		1810	{
		1811	SvREFCNT_dec (self->cb_sk_object);
		1812	self->cb_sk_object = 0;
		1813	}
		1814	}
		1815
		1816	XPUSHs (ST (0));
		1817	}
		1818
		1819	void encode (JSON *self, SV *scalar)
838	PPCODE:	1820	PPCODE:
839	XPUSHs (encode_json (scalar, F_UTF8));	1821	XPUSHs (encode_json (scalar, self));
840		1822
841	void from_json (SV *jsonstr)	1823	void decode (JSON *self, SV *jsonstr)
842	PPCODE:	1824	PPCODE:
843	XPUSHs (decode_json (jsonstr, F_UTF8));	1825	XPUSHs (decode_json (jsonstr, self, 0));
844		1826
		1827	void decode_prefix (JSON *self, SV *jsonstr)
		1828	PPCODE:
		1829	{
		1830	char *offset;
		1831	EXTEND (SP, 2);
		1832	PUSHs (decode_json (jsonstr, self, &offset));
		1833	PUSHs (sv_2mortal (newSVuv (ptr_to_index (jsonstr, offset))));
		1834	}
		1835
		1836	void incr_parse (JSON *self, SV *jsonstr = 0)
		1837	PPCODE:
		1838	{
		1839	if (!self->incr_text)
		1840	self->incr_text = newSVpvn ("", 0);
		1841
		1842	// append data, if any
		1843	if (jsonstr)
		1844	{
		1845	if (SvUTF8 (jsonstr))
		1846	{
		1847	if (!SvUTF8 (self->incr_text))
		1848	{
		1849	/* utf-8-ness differs, need to upgrade */
		1850	sv_utf8_upgrade (self->incr_text);
		1851
		1852	if (self->incr_pos)
		1853	self->incr_pos = utf8_hop ((U8 *)SvPVX (self->incr_text), self->incr_pos)
		1854	- (U8 *)SvPVX (self->incr_text);
		1855	}
		1856	}
		1857	else if (SvUTF8 (self->incr_text))
		1858	sv_utf8_upgrade (jsonstr);
		1859
		1860	{
		1861	STRLEN len;
		1862	const char *str = SvPV (jsonstr, len);
		1863	STRLEN cur = SvCUR (self->incr_text);
		1864
		1865	if (SvLEN (self->incr_text) <= cur + len)
		1866	SvGROW (self->incr_text, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
		1867
		1868	Move (str, SvEND (self->incr_text), len, char);
		1869	SvCUR_set (self->incr_text, SvCUR (self->incr_text) + len);
		1870	*SvEND (self->incr_text) = 0; // this should basically be a nop, too, but make sure it's there
		1871	}
		1872	}
		1873
		1874	if (GIMME_V != G_VOID)
		1875	do
		1876	{
		1877	char *offset;
		1878
		1879	if (!INCR_DONE (self))
		1880	{
		1881	incr_parse (self);
		1882
		1883	if (self->incr_pos > self->max_size && self->max_size)
		1884	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1885	(unsigned long)self->incr_pos, (unsigned long)self->max_size);
		1886
		1887	if (!INCR_DONE (self))
		1888	break;
		1889	}
		1890
		1891	XPUSHs (decode_json (self->incr_text, self, &offset));
		1892
		1893	self->incr_pos -= offset - SvPVX (self->incr_text);
		1894	self->incr_nest = 0;
		1895	self->incr_mode = 0;
		1896
		1897	sv_chop (self->incr_text, offset);
		1898	}
		1899	while (GIMME_V == G_ARRAY);
		1900	}
		1901
		1902	SV *incr_text (JSON *self)
		1903	ATTRS: lvalue
		1904	CODE:
		1905	{
		1906	if (self->incr_pos)
		1907	croak ("incr_text can not be called when the incremental parser already started parsing");
		1908
		1909	RETVAL = self->incr_text ? SvREFCNT_inc (self->incr_text) : &PL_sv_undef;
		1910	}
		1911	OUTPUT:
		1912	RETVAL
		1913
		1914	void incr_skip (JSON *self)
		1915	CODE:
		1916	{
		1917	if (self->incr_pos)
		1918	{
		1919	sv_chop (self->incr_text, SvPV_nolen (self->incr_text) + self->incr_pos);
		1920	self->incr_pos = 0;
		1921	self->incr_nest = 0;
		1922	self->incr_mode = 0;
		1923	}
		1924	}
		1925
		1926	void incr_reset (JSON *self)
		1927	CODE:
		1928	{
		1929	SvREFCNT_dec (self->incr_text);
		1930	self->incr_text = 0;
		1931	self->incr_pos = 0;
		1932	self->incr_nest = 0;
		1933	self->incr_mode = 0;
		1934	}
		1935
		1936	void DESTROY (JSON *self)
		1937	CODE:
		1938	SvREFCNT_dec (self->cb_sk_object);
		1939	SvREFCNT_dec (self->cb_object);
		1940	SvREFCNT_dec (self->incr_text);
		1941
		1942	PROTOTYPES: ENABLE
		1943
		1944	void encode_json (SV *scalar)
		1945	ALIAS:
		1946	to_json_ = 0
		1947	encode_json = F_UTF8
		1948	PPCODE:
		1949	{
		1950	JSON json;
		1951	json_init (&json);
		1952	json.flags |= ix;
		1953	XPUSHs (encode_json (scalar, &json));
		1954	}
		1955
		1956	void decode_json (SV *jsonstr)
		1957	ALIAS:
		1958	from_json_ = 0
		1959	decode_json = F_UTF8
		1960	PPCODE:
		1961	{
		1962	JSON json;
		1963	json_init (&json);
		1964	json.flags |= ix;
		1965	XPUSHs (decode_json (jsonstr, &json, 0));
		1966	}
		1967
		1968

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