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Comparing JSON-XS/XS.xs (file contents):
Revision 1.11 by root, Sat Mar 24 19:42:14 2007 UTC vs.
Revision 1.105 by root, Tue Jan 19 01:07:27 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_ALLOW_NONREF 0x00000080	32	#define F_ALLOW_NONREF 0x00000100UL
16	#define F_SHRINK 0x00000100	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
17		39
18	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	40	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
19	#define F_DEFAULT 0
20		41
21	#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
22		46
23	#define SB do {	47	#define SB do {
24	#define SE } while (0)	48	#define SE } while (0)
25		49
26	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	// fp hell
		194
		195	// scan a group of digits, and a trailing exponent
		196	static void
		197	json_atof_scan1 (const char *s, NV *accum, int *expo, int postdp)
		198	{
		199	UV uaccum = 0;
		200	int eaccum = 0;
		201
		202	for (;;)
		203	{
		204	U8 dig = (U8)*s - '0';
		205
		206	if (expect_false (dig >= 10))
		207	{
		208	if (dig == (U8)((U8)'.' - (U8)'0'))
		209	{
		210	++s;
		211	json_atof_scan1 (s, accum, expo, 1);
		212	}
		213	else if ((dig | ' ') == 'e' - '0')
		214	{
		215	int exp2 = 0;
		216	int neg = 0;
		217
		218	++s;
		219
		220	if (*s == '-')
		221	{
		222	++s;
		223	neg = 1;
		224	}
		225	else if (*s == '+')
		226	++s;
		227
		228	while ((dig = (U8)*s - '0') < 10)
		229	exp2 = exp2 * 10 + *s++ - '0';
		230
		231	*expo += neg ? -exp2 : exp2;
		232	}
		233
		234	break;
		235	}
		236
		237	++s;
		238
		239	uaccum = uaccum * 10 + dig;
		240	++eaccum;
		241
		242	// if we have too many digits, then recurse for more
		243	// we actually do this for rather few digits
		244	if (uaccum >= (UV_MAX - 9) / 10)
		245	{
		246	if (postdp) *expo -= eaccum;
		247	json_atof_scan1 (s, accum, expo, postdp);
		248	if (postdp) *expo += eaccum;
		249
		250	break;
		251	}
		252	}
		253
		254	// this relies greatly on the quality of the pow ()
		255	// implementation of the platform, but a good
		256	// implementation is hard to beat.
		257	if (postdp) *expo -= eaccum;
		258	*accum += uaccum * Perl_pow (10., *expo);
		259	*expo += eaccum;
		260	}
		261
		262	static NV
		263	json_atof (const char *s)
		264	{
		265	NV accum = 0.;
		266	int expo = 0;
		267	int neg = 0;
		268
		269	if (*s == '-')
		270	{
		271	++s;
		272	neg = 1;
		273	}
		274
		275	json_atof_scan1 (s, &accum, &expo, 0);
		276
		277	return neg ? -accum : accum;
		278	}
		279	/////////////////////////////////////////////////////////////////////////////
		280	// encoder
27		281
28	// structure used for encoding JSON	282	// structure used for encoding JSON
29	typedef struct	283	typedef struct
30	{	284	{
31	char *cur;	285	char *cur; // SvPVX (sv) + current output position
32	STRLEN len; // SvLEN (sv)
33	char *end; // SvEND (sv)	286	char *end; // SvEND (sv)
34	SV *sv;	287	SV *sv; // result scalar
35	UV flags;	288	JSON json;
36	int max_recurse;	289	U32 indent; // indentation level
37	int indent;	290	UV limit; // escape character values >= this value when encoding
38	} enc_t;	291	} enc_t;
39		292
40	// structure used for decoding JSON	293	INLINE void
41	typedef struct
42	{
43	char *cur;
44	char *end;
45	const char *err;
46	UV flags;
47	} dec_t;
48
49	static UV *
50	SvJSON (SV *sv)
51	{
52	if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
53	croak ("object is not of type JSON::XS");
54
55	return &SvUVX (SvRV (sv));
56	}
57
58	static void
59	shrink (SV *sv)
60	{
61	sv_utf8_downgrade (sv, 1);
62	#ifdef SvPV_shrink_to_cur
63	SvPV_shrink_to_cur (sv);
64	#endif
65	}
66
67	/////////////////////////////////////////////////////////////////////////////
68
69	static void
70	need (enc_t *enc, STRLEN len)	294	need (enc_t *enc, STRLEN len)
71	{	295	{
72	if (enc->cur + len >= enc->end)	296	if (expect_false (enc->cur + len >= enc->end))
73	{	297	{
74	STRLEN cur = enc->cur - SvPVX (enc->sv);	298	STRLEN cur = enc->cur - (char *)SvPVX (enc->sv);
75	SvGROW (enc->sv, cur + len + 1);	299	SvGROW (enc->sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
76	enc->cur = SvPVX (enc->sv) + cur;	300	enc->cur = SvPVX (enc->sv) + cur;
77	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv);	301	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
78	}	302	}
79	}	303	}
80		304
81	static void	305	INLINE void
82	encode_ch (enc_t *enc, char ch)	306	encode_ch (enc_t *enc, char ch)
83	{	307	{
84	need (enc, 1);	308	need (enc, 1);
85	*enc->cur++ = ch;	309	*enc->cur++ = ch;
86	}	310	}
…		…
94		318
95	while (str < end)	319	while (str < end)
96	{	320	{
97	unsigned char ch = *(unsigned char *)str;	321	unsigned char ch = *(unsigned char *)str;
98		322
99	if (ch >= 0x20 && ch < 0x80) // most common case	323	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
100	{	324	{
101	if (ch == '"') // but with slow exceptions	325	if (expect_false (ch == '"')) // but with slow exceptions
102	{	326	{
103	need (enc, len += 1);	327	need (enc, len += 1);
104	*enc->cur++ = '\\';	328	*enc->cur++ = '\\';
105	*enc->cur++ = '"';	329	*enc->cur++ = '"';
106	}	330	}
107	else if (ch == '\\')	331	else if (expect_false (ch == '\\'))
108	{	332	{
109	need (enc, len += 1);	333	need (enc, len += 1);
110	*enc->cur++ = '\\';	334	*enc->cur++ = '\\';
111	*enc->cur++ = '\\';	335	*enc->cur++ = '\\';
112	}	336	}
…		…
130	STRLEN clen;	354	STRLEN clen;
131	UV uch;	355	UV uch;
132		356
133	if (is_utf8)	357	if (is_utf8)
134	{	358	{
135	uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);	359	uch = decode_utf8 (str, end - str, &clen);
136	if (clen == (STRLEN)-1)	360	if (clen == (STRLEN)-1)
137	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);	361	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
138	}	362	}
139	else	363	else
140	{	364	{
141	uch = ch;	365	uch = ch;
142	clen = 1;	366	clen = 1;
143	}	367	}
144		368
145	if (uch > 0x10FFFFUL)	369	if (uch < 0x80/*0x20*/ || uch >= enc->limit)
146	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
147
148	if (uch < 0x80 || enc->flags & F_ASCII)
149	{	370	{
150	if (uch > 0xFFFFUL)	371	if (uch >= 0x10000UL)
151	{	372	{
		373	if (uch >= 0x110000UL)
		374	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		375
152	need (enc, len += 11);	376	need (enc, len += 11);
153	sprintf (enc->cur, "\\u%04x\\u%04x",	377	sprintf (enc->cur, "\\u%04x\\u%04x",
154	(int)((uch - 0x10000) / 0x400 + 0xD800),	378	(int)((uch - 0x10000) / 0x400 + 0xD800),
155	(int)((uch - 0x10000) % 0x400 + 0xDC00));	379	(int)((uch - 0x10000) % 0x400 + 0xDC00));
156	enc->cur += 12;	380	enc->cur += 12;
157	}	381	}
158	else	382	else
159	{	383	{
160	static char hexdigit [16] = "0123456789abcdef";
161	need (enc, len += 5);	384	need (enc, len += 5);
162	*enc->cur++ = '\\';	385	*enc->cur++ = '\\';
163	*enc->cur++ = 'u';	386	*enc->cur++ = 'u';
164	*enc->cur++ = hexdigit [ uch >> 12 ];	387	*enc->cur++ = PL_hexdigit [ uch >> 12 ];
165	*enc->cur++ = hexdigit [(uch >> 8) & 15];	388	*enc->cur++ = PL_hexdigit [(uch >> 8) & 15];
166	*enc->cur++ = hexdigit [(uch >> 4) & 15];	389	*enc->cur++ = PL_hexdigit [(uch >> 4) & 15];
167	*enc->cur++ = hexdigit [(uch >> 0) & 15];	390	*enc->cur++ = PL_hexdigit [(uch >> 0) & 15];
168	}	391	}
169		392
		393	str += clen;
		394	}
		395	else if (enc->json.flags & F_LATIN1)
		396	{
		397	*enc->cur++ = uch;
170	str += clen;	398	str += clen;
171	}	399	}
172	else if (is_utf8)	400	else if (is_utf8)
173	{	401	{
174	need (enc, len += clen);	402	need (enc, len += clen);
…		…
178	}	406	}
179	while (--clen);	407	while (--clen);
180	}	408	}
181	else	409	else
182	{	410	{
183	need (enc, len += 10); // never more than 11 bytes needed	411	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
184	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);	412	enc->cur = encode_utf8 (enc->cur, uch);
185	++str;	413	++str;
186	}	414	}
187	}	415	}
188	}	416	}
189	}	417	}
190		418
191	--len;	419	--len;
192	}	420	}
193	}	421	}
194		422
195	#define INDENT SB \	423	INLINE void
		424	encode_indent (enc_t *enc)
		425	{
196	if (enc->flags & F_INDENT) \	426	if (enc->json.flags & F_INDENT)
197	{ \	427	{
198	int i_; \	428	int spaces = enc->indent * INDENT_STEP;
199	need (enc, enc->indent); \	429
200	for (i_ = enc->indent * 3; i_--; )\	430	need (enc, spaces);
		431	memset (enc->cur, ' ', spaces);
		432	enc->cur += spaces;
		433	}
		434	}
		435
		436	INLINE void
		437	encode_space (enc_t *enc)
		438	{
		439	need (enc, 1);
		440	encode_ch (enc, ' ');
		441	}
		442
		443	INLINE void
		444	encode_nl (enc_t *enc)
		445	{
		446	if (enc->json.flags & F_INDENT)
		447	{
		448	need (enc, 1);
201	encode_ch (enc, ' '); \	449	encode_ch (enc, '\n');
202	} \	450	}
203	SE	451	}
204		452
205	#define SPACE SB need (enc, 1); encode_ch (enc, ' '); SE	453	INLINE void
206	#define NL SB if (enc->flags & F_INDENT) { need (enc, 1); encode_ch (enc, '\n'); } SE	454	encode_comma (enc_t *enc)
207	#define COMMA SB \	455	{
208	encode_ch (enc, ','); \	456	encode_ch (enc, ',');
		457
209	if (enc->flags & F_INDENT) \	458	if (enc->json.flags & F_INDENT)
210	NL; \	459	encode_nl (enc);
211	else if (enc->flags & F_SPACE_AFTER) \	460	else if (enc->json.flags & F_SPACE_AFTER)
212	SPACE; \	461	encode_space (enc);
213	SE	462	}
214		463
215	static void encode_sv (enc_t *enc, SV *sv);	464	static void encode_sv (enc_t *enc, SV *sv);
216		465
217	static void	466	static void
218	encode_av (enc_t *enc, AV *av)	467	encode_av (enc_t *enc, AV *av)
219	{	468	{
220	int i, len = av_len (av);	469	int i, len = av_len (av);
221		470
		471	if (enc->indent >= enc->json.max_depth)
		472	croak (ERR_NESTING_EXCEEDED);
		473
222	encode_ch (enc, '['); NL;	474	encode_ch (enc, '[');
223	++enc->indent;	475
		476	if (len >= 0)
		477	{
		478	encode_nl (enc); ++enc->indent;
224		479
225	for (i = 0; i <= len; ++i)	480	for (i = 0; i <= len; ++i)
226	{	481	{
227	INDENT;	482	SV **svp = av_fetch (av, i, 0);
228	encode_sv (enc, *av_fetch (av, i, 0));
229		483
		484	encode_indent (enc);
		485
		486	if (svp)
		487	encode_sv (enc, *svp);
		488	else
		489	encode_str (enc, "null", 4, 0);
		490
230	if (i < len)	491	if (i < len)
231	COMMA;	492	encode_comma (enc);
232	}	493	}
233		494
234	NL;	495	encode_nl (enc); --enc->indent; encode_indent (enc);
235		496	}
236	--enc->indent;	497
237	INDENT; encode_ch (enc, ']');	498	encode_ch (enc, ']');
238	}	499	}
239		500
240	static void	501	static void
241	encode_he (enc_t *enc, HE *he)	502	encode_hk (enc_t *enc, HE *he)
242	{	503	{
243	encode_ch (enc, '"');	504	encode_ch (enc, '"');
244		505
245	if (HeKLEN (he) == HEf_SVKEY)	506	if (HeKLEN (he) == HEf_SVKEY)
246	{	507	{
…		…
256	else	517	else
257	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	518	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
258		519
259	encode_ch (enc, '"');	520	encode_ch (enc, '"');
260		521
261	if (enc->flags & F_SPACE_BEFORE) SPACE;	522	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
262	encode_ch (enc, ':');	523	encode_ch (enc, ':');
263	if (enc->flags & F_SPACE_AFTER ) SPACE;	524	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
264	encode_sv (enc, HeVAL (he));
265	}	525	}
266		526
267	// compare hash entries, used when all keys are bytestrings	527	// compare hash entries, used when all keys are bytestrings
268	static int	528	static int
269	he_cmp_fast (const void *a_, const void *b_)	529	he_cmp_fast (const void *a_, const void *b_)
…		…
274	HE *b = *(HE **)b_;	534	HE *b = *(HE **)b_;
275		535
276	STRLEN la = HeKLEN (a);	536	STRLEN la = HeKLEN (a);
277	STRLEN lb = HeKLEN (b);	537	STRLEN lb = HeKLEN (b);
278		538
279	if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	539	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
280	cmp = la - lb;	540	cmp = lb - la;
281		541
282	return cmp;	542	return cmp;
283	}	543	}
284		544
285	// compare hash entries, used when some keys are sv's or utf-x	545	// compare hash entries, used when some keys are sv's or utf-x
286	static int	546	static int
287	he_cmp_slow (const void *a, const void *b)	547	he_cmp_slow (const void *a, const void *b)
288	{	548	{
289	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	549	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
290	}	550	}
291		551
292	static void	552	static void
293	encode_hv (enc_t *enc, HV *hv)	553	encode_hv (enc_t *enc, HV *hv)
294	{	554	{
295	int count, i;	555	HE *he;
296		556
297	encode_ch (enc, '{'); NL; ++enc->indent;	557	if (enc->indent >= enc->json.max_depth)
		558	croak (ERR_NESTING_EXCEEDED);
298		559
299	if ((count = hv_iterinit (hv)))	560	encode_ch (enc, '{');
300	{	561
301	// for canonical output we have to sort by keys first	562	// for canonical output we have to sort by keys first
302	// actually, this is mostly due to the stupid so-called	563	// actually, this is mostly due to the stupid so-called
303	// security workaround added somewhere in 5.8.x.	564	// security workaround added somewhere in 5.8.x
304	// that randomises hash orderings	565	// that randomises hash orderings
305	if (enc->flags & F_CANONICAL)	566	if (enc->json.flags & F_CANONICAL && !SvRMAGICAL (hv))
		567	{
		568	int count = hv_iterinit (hv);
		569
		570	if (SvMAGICAL (hv))
306	{	571	{
307	HE *he, *hes [count];	572	// need to count by iterating. could improve by dynamically building the vector below
		573	// but I don't care for the speed of this special case.
		574	// note also that we will run into undefined behaviour when the two iterations
		575	// do not result in the same count, something I might care for in some later release.
		576
		577	count = 0;
		578	while (hv_iternext (hv))
		579	++count;
		580
		581	hv_iterinit (hv);
		582	}
		583
		584	if (count)
		585	{
308	int fast = 1;	586	int i, fast = 1;
		587	#if defined(__BORLANDC__) || defined(_MSC_VER)
		588	HE **hes = _alloca (count * sizeof (HE));
		589	#else
		590	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
		591	#endif
309		592
310	i = 0;	593	i = 0;
311	while ((he = hv_iternext (hv)))	594	while ((he = hv_iternext (hv)))
312	{	595	{
313	hes [i++] = he;	596	hes [i++] = he;
…		…
335		618
336	FREETMPS;	619	FREETMPS;
337	LEAVE;	620	LEAVE;
338	}	621	}
339		622
340	for (i = 0; i < count; ++i)	623	encode_nl (enc); ++enc->indent;
		624
		625	while (count--)
341	{	626	{
342	INDENT;	627	encode_indent (enc);
		628	he = hes [count];
343	encode_he (enc, hes [i]);	629	encode_hk (enc, he);
		630	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
344		631
345	if (i < count - 1)	632	if (count)
346	COMMA;	633	encode_comma (enc);
347	}	634	}
348		635
		636	encode_nl (enc); --enc->indent; encode_indent (enc);
		637	}
		638	}
		639	else
		640	{
		641	if (hv_iterinit (hv) || SvMAGICAL (hv))
		642	if ((he = hv_iternext (hv)))
349	NL;	643	{
		644	encode_nl (enc); ++enc->indent;
		645
		646	for (;;)
		647	{
		648	encode_indent (enc);
		649	encode_hk (enc, he);
		650	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
		651
		652	if (!(he = hv_iternext (hv)))
		653	break;
		654
		655	encode_comma (enc);
		656	}
		657
		658	encode_nl (enc); --enc->indent; encode_indent (enc);
		659	}
		660	}
		661
		662	encode_ch (enc, '}');
		663	}
		664
		665	// encode objects, arrays and special \0=false and \1=true values.
		666	static void
		667	encode_rv (enc_t *enc, SV *sv)
		668	{
		669	svtype svt;
		670
		671	SvGETMAGIC (sv);
		672	svt = SvTYPE (sv);
		673
		674	if (expect_false (SvOBJECT (sv)))
		675	{
		676	HV *stash = !JSON_SLOW || json_boolean_stash
		677	? json_boolean_stash
		678	: gv_stashpv ("JSON::XS::Boolean", 1);
		679
		680	if (SvSTASH (sv) == stash)
		681	{
		682	if (SvIV (sv))
		683	encode_str (enc, "true", 4, 0);
		684	else
		685	encode_str (enc, "false", 5, 0);
350	}	686	}
351	else	687	else
352	{	688	{
353	SV *sv;	689	#if 0
354	HE *he = hv_iternext (hv);	690	if (0 && sv_derived_from (rv, "JSON::Literal"))
355
356	for (;;)
357	{	691	{
358	INDENT;	692	// not yet
359	encode_he (enc, he);
360
361	if (!(he = hv_iternext (hv)))
362	break;
363
364	COMMA;
365	}	693	}
366		694	#endif
		695	if (enc->json.flags & F_CONV_BLESSED)
367	NL;	696	{
		697	// we re-bless the reference to get overload and other niceties right
		698	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
		699
		700	if (to_json)
		701	{
		702	dSP;
		703
		704	ENTER; SAVETMPS; PUSHMARK (SP);
		705	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		706
		707	// calling with G_SCALAR ensures that we always get a 1 return value
		708	PUTBACK;
		709	call_sv ((SV *)GvCV (to_json), G_SCALAR);
		710	SPAGAIN;
		711
		712	// catch this surprisingly common error
		713	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		714	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		715
		716	sv = POPs;
		717	PUTBACK;
		718
		719	encode_sv (enc, sv);
		720
		721	FREETMPS; LEAVE;
		722	}
		723	else if (enc->json.flags & F_ALLOW_BLESSED)
		724	encode_str (enc, "null", 4, 0);
		725	else
		726	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		727	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		728	}
		729	else if (enc->json.flags & F_ALLOW_BLESSED)
		730	encode_str (enc, "null", 4, 0);
		731	else
		732	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		733	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
368	}	734	}
369	}	735	}
		736	else if (svt == SVt_PVHV)
		737	encode_hv (enc, (HV *)sv);
		738	else if (svt == SVt_PVAV)
		739	encode_av (enc, (AV *)sv);
		740	else if (svt < SVt_PVAV)
		741	{
		742	STRLEN len = 0;
		743	char *pv = svt ? SvPV (sv, len) : 0;
370		744
371	--enc->indent; INDENT; encode_ch (enc, '}');	745	if (len == 1 && *pv == '1')
		746	encode_str (enc, "true", 4, 0);
		747	else if (len == 1 && *pv == '0')
		748	encode_str (enc, "false", 5, 0);
		749	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		750	encode_str (enc, "null", 4, 0);
		751	else
		752	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		753	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		754	}
		755	else if (enc->json.flags & F_ALLOW_UNKNOWN)
		756	encode_str (enc, "null", 4, 0);
		757	else
		758	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		759	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
372	}	760	}
373		761
374	static void	762	static void
375	encode_sv (enc_t *enc, SV *sv)	763	encode_sv (enc_t *enc, SV *sv)
376	{	764	{
…		…
384	encode_str (enc, str, len, SvUTF8 (sv));	772	encode_str (enc, str, len, SvUTF8 (sv));
385	encode_ch (enc, '"');	773	encode_ch (enc, '"');
386	}	774	}
387	else if (SvNOKp (sv))	775	else if (SvNOKp (sv))
388	{	776	{
		777	// trust that perl will do the right thing w.r.t. JSON syntax.
389	need (enc, NV_DIG + 32);	778	need (enc, NV_DIG + 32);
390	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	779	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
391	enc->cur += strlen (enc->cur);	780	enc->cur += strlen (enc->cur);
392	}	781	}
393	else if (SvIOKp (sv))	782	else if (SvIOKp (sv))
394	{	783	{
		784	// we assume we can always read an IV as a UV and vice versa
		785	// we assume two's complement
		786	// we assume no aliasing issues in the union
		787	if (SvIsUV (sv) ? SvUVX (sv) <= 59000
		788	: SvIVX (sv) <= 59000 && SvIVX (sv) >= -59000)
		789	{
		790	// optimise the "small number case"
		791	// code will likely be branchless and use only a single multiplication
		792	// works for numbers up to 59074
		793	I32 i = SvIVX (sv);
		794	U32 u;
		795	char digit, nz = 0;
		796
395	need (enc, 64);	797	need (enc, 6);
		798
		799	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		800	u = i < 0 ? -i : i;
		801
		802	// convert to 4.28 fixed-point representation
		803	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		804
		805	// now output digit by digit, each time masking out the integer part
		806	// and multiplying by 5 while moving the decimal point one to the right,
		807	// resulting in a net multiplication by 10.
		808	// we always write the digit to memory but conditionally increment
		809	// the pointer, to enable the use of conditional move instructions.
		810	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffffUL) * 5;
		811	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffffUL) * 5;
		812	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffffUL) * 5;
		813	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffffUL) * 5;
		814	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		815	}
		816	else
		817	{
		818	// large integer, use the (rather slow) snprintf way.
		819	need (enc, IVUV_MAXCHARS);
396	enc->cur +=	820	enc->cur +=
397	SvIsUV(sv)	821	SvIsUV(sv)
398	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	822	? snprintf (enc->cur, IVUV_MAXCHARS, "%"UVuf, (UV)SvUVX (sv))
399	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	823	: snprintf (enc->cur, IVUV_MAXCHARS, "%"IVdf, (IV)SvIVX (sv));
		824	}
400	}	825	}
401	else if (SvROK (sv))	826	else if (SvROK (sv))
402	{	827	encode_rv (enc, SvRV (sv));
403	SV *rv = SvRV (sv);	828	else if (!SvOK (sv) || enc->json.flags & F_ALLOW_UNKNOWN)
404
405	if (!--enc->max_recurse)
406	croak ("data structure too deep (hit recursion limit)");
407
408	switch (SvTYPE (rv))
409	{
410	case SVt_PVAV: encode_av (enc, (AV *)rv); break;
411	case SVt_PVHV: encode_hv (enc, (HV *)rv); break;
412
413	default:
414	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
415	SvPV_nolen (sv));
416	}
417	}
418	else if (!SvOK (sv))
419	encode_str (enc, "null", 4, 0);	829	encode_str (enc, "null", 4, 0);
420	else	830	else
421	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",	831	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
422	SvPV_nolen (sv), SvFLAGS (sv));	832	SvPV_nolen (sv), SvFLAGS (sv));
423	}	833	}
424		834
425	static SV *	835	static SV *
426	encode_json (SV *scalar, UV flags)	836	encode_json (SV *scalar, JSON *json)
427	{	837	{
		838	enc_t enc;
		839
428	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))	840	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
429	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");	841	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
430		842
431	enc_t enc;	843	enc.json = *json;
432	enc.flags = flags;
433	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	844	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
434	enc.cur = SvPVX (enc.sv);	845	enc.cur = SvPVX (enc.sv);
435	enc.end = SvEND (enc.sv);	846	enc.end = SvEND (enc.sv);
436	enc.max_recurse = 0;
437	enc.indent = 0;	847	enc.indent = 0;
		848	enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
		849	: enc.json.flags & F_LATIN1 ? 0x000100UL
		850	: 0x110000UL;
438		851
439	SvPOK_only (enc.sv);	852	SvPOK_only (enc.sv);
440	encode_sv (&enc, scalar);	853	encode_sv (&enc, scalar);
		854	encode_nl (&enc);
441		855
		856	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		857	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		858
442	if (!(flags & (F_ASCII | F_UTF8)))	859	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
443	SvUTF8_on (enc.sv);	860	SvUTF8_on (enc.sv);
444		861
445	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
446
447	if (enc.flags & F_SHRINK)	862	if (enc.json.flags & F_SHRINK)
448	shrink (enc.sv);	863	shrink (enc.sv);
449		864
450	return enc.sv;	865	return enc.sv;
451	}	866	}
452		867
453	/////////////////////////////////////////////////////////////////////////////	868	/////////////////////////////////////////////////////////////////////////////
		869	// decoder
454		870
455	#define WS \	871	// structure used for decoding JSON
		872	typedef struct
		873	{
		874	char *cur; // current parser pointer
		875	char *end; // end of input string
		876	const char *err; // parse error, if != 0
		877	JSON json;
		878	U32 depth; // recursion depth
		879	U32 maxdepth; // recursion depth limit
		880	} dec_t;
		881
		882	INLINE void
		883	decode_comment (dec_t *dec)
		884	{
		885	// only '#'-style comments allowed a.t.m.
		886
		887	while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
		888	++dec->cur;
		889	}
		890
		891	INLINE void
		892	decode_ws (dec_t *dec)
		893	{
456	for (;;) \	894	for (;;)
457	{ \	895	{
458	char ch = *dec->cur; \	896	char ch = *dec->cur;
		897
459	if (ch > 0x20 \	898	if (ch > 0x20)
		899	{
		900	if (expect_false (ch == '#'))
		901	{
		902	if (dec->json.flags & F_RELAXED)
		903	decode_comment (dec);
		904	else
		905	break;
		906	}
		907	else
		908	break;
		909	}
460	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)) \	910	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
461	break; \	911	break; // parse error, but let higher level handle it, gives better error messages
		912
462	++dec->cur; \	913	++dec->cur;
463	}	914	}
		915	}
464		916
465	#define ERR(reason) SB dec->err = reason; goto fail; SE	917	#define ERR(reason) SB dec->err = reason; goto fail; SE
		918
466	#define EXPECT_CH(ch) SB \	919	#define EXPECT_CH(ch) SB \
467	if (*dec->cur != ch) \	920	if (*dec->cur != ch) \
468	ERR (# ch " expected"); \	921	ERR (# ch " expected"); \
469	++dec->cur; \	922	++dec->cur; \
470	SE	923	SE
471		924
		925	#define DEC_INC_DEPTH if (++dec->depth > dec->json.max_depth) ERR (ERR_NESTING_EXCEEDED)
		926	#define DEC_DEC_DEPTH --dec->depth
		927
472	static SV *decode_sv (dec_t *dec);	928	static SV *decode_sv (dec_t *dec);
473		929
474	static signed char decode_hexdigit[256];	930	static signed char decode_hexdigit[256];
475		931
476	static UV	932	static UV
477	decode_4hex (dec_t *dec)	933	decode_4hex (dec_t *dec)
478	{	934	{
479	signed char d1, d2, d3, d4;	935	signed char d1, d2, d3, d4;
		936	unsigned char *cur = (unsigned char *)dec->cur;
480		937
481	d1 = decode_hexdigit [((unsigned char *)dec->cur) [0]];	938	d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
482	if (d1 < 0) ERR ("four hexadecimal digits expected");	939	d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
483	d2 = decode_hexdigit [((unsigned char *)dec->cur) [1]];	940	d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
484	if (d2 < 0) ERR ("four hexadecimal digits expected");	941	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
485	d3 = decode_hexdigit [((unsigned char *)dec->cur) [2]];
486	if (d3 < 0) ERR ("four hexadecimal digits expected");
487	d4 = decode_hexdigit [((unsigned char *)dec->cur) [3]];
488	if (d4 < 0) ERR ("four hexadecimal digits expected");
489		942
490	dec->cur += 4;	943	dec->cur += 4;
491		944
492	return ((UV)d1) << 12	945	return ((UV)d1) << 12
493	| ((UV)d2) << 8	946	| ((UV)d2) << 8
…		…
496		949
497	fail:	950	fail:
498	return (UV)-1;	951	return (UV)-1;
499	}	952	}
500		953
501	#define APPEND_GROW(n) SB \
502	if (cur + (n) >= end) \
503	{ \
504	STRLEN ofs = cur - SvPVX (sv); \
505	SvGROW (sv, ofs + (n) + 1); \
506	cur = SvPVX (sv) + ofs; \
507	end = SvEND (sv); \
508	} \
509	SE
510
511	#define APPEND_CH(ch) SB \
512	APPEND_GROW (1); \
513	*cur++ = (ch); \
514	SE
515
516	static SV *	954	static SV *
517	decode_str (dec_t *dec)	955	decode_str (dec_t *dec)
518	{	956	{
519	SV *sv = NEWSV (0,2);	957	SV *sv = 0;
520	int utf8 = 0;	958	int utf8 = 0;
521	char *cur = SvPVX (sv);	959	char *dec_cur = dec->cur;
522	char *end = SvEND (sv);
523		960
524	for (;;)	961	do
525	{	962	{
526	unsigned char ch = *(unsigned char *)dec->cur;	963	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
		964	char *cur = buf;
527		965
528	if (ch == '"')	966	do
529	break;
530	else if (ch == '\\')
531	{	967	{
532	switch (*++dec->cur)	968	unsigned char ch = *(unsigned char *)dec_cur++;
		969
		970	if (expect_false (ch == '"'))
533	{	971	{
534	case '\\':	972	--dec_cur;
535	case '/':	973	break;
536	case '"': APPEND_CH (*dec->cur++); break;	974	}
537		975	else if (expect_false (ch == '\\'))
538	case 'b': APPEND_CH ('\010'); ++dec->cur; break;	976	{
539	case 't': APPEND_CH ('\011'); ++dec->cur; break;	977	switch (*dec_cur)
540	case 'n': APPEND_CH ('\012'); ++dec->cur; break;
541	case 'f': APPEND_CH ('\014'); ++dec->cur; break;
542	case 'r': APPEND_CH ('\015'); ++dec->cur; break;
543
544	case 'u':
545	{	978	{
546	UV lo, hi;	979	case '\\':
547	++dec->cur;	980	case '/':
		981	case '"': *cur++ = *dec_cur++; break;
548		982
549	hi = decode_4hex (dec);	983	case 'b': ++dec_cur; *cur++ = '\010'; break;
550	if (hi == (UV)-1)	984	case 't': ++dec_cur; *cur++ = '\011'; break;
551	goto fail;	985	case 'n': ++dec_cur; *cur++ = '\012'; break;
		986	case 'f': ++dec_cur; *cur++ = '\014'; break;
		987	case 'r': ++dec_cur; *cur++ = '\015'; break;
552		988
553	// possibly a surrogate pair	989	case 'u':
554	if (hi >= 0xd800 && hi < 0xdc00)
555	{	990	{
556	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	991	UV lo, hi;
557	ERR ("missing low surrogate character in surrogate pair");	992	++dec_cur;
558		993
559	dec->cur += 2;	994	dec->cur = dec_cur;
560
561	lo = decode_4hex (dec);	995	hi = decode_4hex (dec);
		996	dec_cur = dec->cur;
562	if (lo == (UV)-1)	997	if (hi == (UV)-1)
563	goto fail;	998	goto fail;
564		999
		1000	// possibly a surrogate pair
		1001	if (hi >= 0xd800)
		1002	if (hi < 0xdc00)
		1003	{
		1004	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
		1005	ERR ("missing low surrogate character in surrogate pair");
		1006
		1007	dec_cur += 2;
		1008
		1009	dec->cur = dec_cur;
		1010	lo = decode_4hex (dec);
		1011	dec_cur = dec->cur;
		1012	if (lo == (UV)-1)
		1013	goto fail;
		1014
565	if (lo < 0xdc00 || lo >= 0xe000)	1015	if (lo < 0xdc00 || lo >= 0xe000)
566	ERR ("surrogate pair expected");	1016	ERR ("surrogate pair expected");
567		1017
568	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;	1018	hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
		1019	}
		1020	else if (hi < 0xe000)
		1021	ERR ("missing high surrogate character in surrogate pair");
		1022
		1023	if (hi >= 0x80)
		1024	{
		1025	utf8 = 1;
		1026
		1027	cur = encode_utf8 (cur, hi);
		1028	}
		1029	else
		1030	*cur++ = hi;
569	}	1031	}
570	else if (hi >= 0xdc00 && hi < 0xe000)
571	ERR ("missing high surrogate character in surrogate pair");
572
573	if (hi >= 0x80)
574	{	1032	break;
575	utf8 = 1;
576		1033
577	APPEND_GROW (4); // at most 4 bytes for 21 bits
578	cur = (char *)uvuni_to_utf8_flags (cur, hi, 0);
579	}
580	else	1034	default:
581	APPEND_CH (hi);	1035	--dec_cur;
		1036	ERR ("illegal backslash escape sequence in string");
582	}	1037	}
583	break;	1038	}
		1039	else if (expect_true (ch >= 0x20 && ch < 0x80))
		1040	*cur++ = ch;
		1041	else if (ch >= 0x80)
		1042	{
		1043	STRLEN clen;
584		1044
585	default:
586	--dec->cur;	1045	--dec_cur;
587	ERR ("illegal backslash escape sequence in string");	1046
		1047	decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
		1048	if (clen == (STRLEN)-1)
		1049	ERR ("malformed UTF-8 character in JSON string");
		1050
		1051	do
		1052	*cur++ = *dec_cur++;
		1053	while (--clen);
		1054
		1055	utf8 = 1;
		1056	}
		1057	else
		1058	{
		1059	--dec_cur;
		1060
		1061	if (!ch)
		1062	ERR ("unexpected end of string while parsing JSON string");
		1063	else
		1064	ERR ("invalid character encountered while parsing JSON string");
588	}	1065	}
589	}	1066	}
590	else if (ch >= 0x20 && ch <= 0x7f)	1067	while (cur < buf + SHORT_STRING_LEN);
591	APPEND_CH (*dec->cur++);	1068
592	else if (ch >= 0x80)
593	{	1069	{
594	STRLEN clen;	1070	STRLEN len = cur - buf;
595	UV uch = utf8n_to_uvuni (dec->cur, dec->end - dec->cur, &clen, UTF8_CHECK_ONLY);
596	if (clen == (STRLEN)-1)
597	ERR ("malformed UTF-8 character in JSON string");
598		1071
599	APPEND_GROW (clen);	1072	if (sv)
600	do
601	{	1073	{
602	*cur++ = *dec->cur++;	1074	STRLEN cur = SvCUR (sv);
		1075
		1076	if (SvLEN (sv) <= cur + len)
		1077	SvGROW (sv, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
		1078
		1079	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
		1080	SvCUR_set (sv, SvCUR (sv) + len);
603	}	1081	}
604	while (--clen);
605
606	utf8 = 1;
607	}
608	else if (dec->cur == dec->end)
609	ERR ("unexpected end of string while parsing json string");
610	else	1082	else
611	ERR ("invalid character encountered");	1083	sv = newSVpvn (buf, len);
612	}	1084	}
		1085	}
		1086	while (*dec_cur != '"');
613		1087
614	++dec->cur;	1088	++dec_cur;
615		1089
616	SvCUR_set (sv, cur - SvPVX (sv));	1090	if (sv)
617		1091	{
618	SvPOK_only (sv);	1092	SvPOK_only (sv);
619	*SvEND (sv) = 0;	1093	*SvEND (sv) = 0;
620		1094
621	if (utf8)	1095	if (utf8)
622	SvUTF8_on (sv);	1096	SvUTF8_on (sv);
		1097	}
		1098	else
		1099	sv = newSVpvn ("", 0);
623		1100
624	if (dec->flags & F_SHRINK)	1101	dec->cur = dec_cur;
625	shrink (sv);
626
627	return sv;	1102	return sv;
628		1103
629	fail:	1104	fail:
630	SvREFCNT_dec (sv);	1105	dec->cur = dec_cur;
631	return 0;	1106	return 0;
632	}	1107	}
633		1108
634	static SV *	1109	static SV *
635	decode_num (dec_t *dec)	1110	decode_num (dec_t *dec)
…		…
693	is_nv = 1;	1168	is_nv = 1;
694	}	1169	}
695		1170
696	if (!is_nv)	1171	if (!is_nv)
697	{	1172	{
698	UV uv;	1173	int len = dec->cur - start;
699	int numtype = grok_number (start, dec->cur - start, &uv);	1174
700	if (numtype & IS_NUMBER_IN_UV)	1175	// special case the rather common 1..5-digit-int case
701	if (numtype & IS_NUMBER_NEG)	1176	if (*start == '-')
		1177	switch (len)
702	{	1178	{
703	if (uv < (UV)IV_MIN)	1179	case 2: return newSViv (-(IV)( start [1] - '0' * 1));
704	return newSViv (-(IV)uv);	1180	case 3: return newSViv (-(IV)( start [1] * 10 + start [2] - '0' * 11));
		1181	case 4: return newSViv (-(IV)( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		1182	case 5: return newSViv (-(IV)( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
		1183	case 6: return newSViv (-(IV)(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
705	}	1184	}
		1185	else
		1186	switch (len)
		1187	{
		1188	case 1: return newSViv ( start [0] - '0' * 1);
		1189	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1190	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1191	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1192	case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
		1193	}
		1194
		1195	{
		1196	UV uv;
		1197	int numtype = grok_number (start, len, &uv);
		1198	if (numtype & IS_NUMBER_IN_UV)
		1199	if (numtype & IS_NUMBER_NEG)
		1200	{
		1201	if (uv < (UV)IV_MIN)
		1202	return newSViv (-(IV)uv);
		1203	}
706	else	1204	else
707	return newSVuv (uv);	1205	return newSVuv (uv);
708	}	1206	}
709		1207
		1208	len -= *start == '-' ? 1 : 0;
		1209
		1210	// does not fit into IV or UV, try NV
		1211	if (len <= NV_DIG)
		1212	// fits into NV without loss of precision
		1213	return newSVnv (json_atof (start));
		1214
		1215	// everything else fails, convert it to a string
		1216	return newSVpvn (start, dec->cur - start);
		1217	}
		1218
		1219	// loss of precision here
710	return newSVnv (Atof (start));	1220	return newSVnv (json_atof (start));
711		1221
712	fail:	1222	fail:
713	return 0;	1223	return 0;
714	}	1224	}
715		1225
716	static SV *	1226	static SV *
717	decode_av (dec_t *dec)	1227	decode_av (dec_t *dec)
718	{	1228	{
719	AV *av = newAV ();	1229	AV *av = newAV ();
720		1230
721	WS;	1231	DEC_INC_DEPTH;
		1232	decode_ws (dec);
		1233
722	if (*dec->cur == ']')	1234	if (*dec->cur == ']')
723	++dec->cur;	1235	++dec->cur;
724	else	1236	else
725	for (;;)	1237	for (;;)
726	{	1238	{
…		…
730	if (!value)	1242	if (!value)
731	goto fail;	1243	goto fail;
732		1244
733	av_push (av, value);	1245	av_push (av, value);
734		1246
735	WS;	1247	decode_ws (dec);
736		1248
737	if (*dec->cur == ']')	1249	if (*dec->cur == ']')
738	{	1250	{
739	++dec->cur;	1251	++dec->cur;
740	break;	1252	break;
…		…
742		1254
743	if (*dec->cur != ',')	1255	if (*dec->cur != ',')
744	ERR (", or ] expected while parsing array");	1256	ERR (", or ] expected while parsing array");
745		1257
746	++dec->cur;	1258	++dec->cur;
		1259
		1260	decode_ws (dec);
		1261
		1262	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1263	{
		1264	++dec->cur;
		1265	break;
		1266	}
747	}	1267	}
748		1268
		1269	DEC_DEC_DEPTH;
749	return newRV_noinc ((SV *)av);	1270	return newRV_noinc ((SV *)av);
750		1271
751	fail:	1272	fail:
752	SvREFCNT_dec (av);	1273	SvREFCNT_dec (av);
		1274	DEC_DEC_DEPTH;
753	return 0;	1275	return 0;
754	}	1276	}
755		1277
756	static SV *	1278	static SV *
757	decode_hv (dec_t *dec)	1279	decode_hv (dec_t *dec)
758	{	1280	{
		1281	SV *sv;
759	HV *hv = newHV ();	1282	HV *hv = newHV ();
760		1283
761	WS;	1284	DEC_INC_DEPTH;
		1285	decode_ws (dec);
		1286
762	if (*dec->cur == '}')	1287	if (*dec->cur == '}')
763	++dec->cur;	1288	++dec->cur;
764	else	1289	else
765	for (;;)	1290	for (;;)
766	{	1291	{
767	SV *key, *value;
768
769	WS; EXPECT_CH ('"');	1292	EXPECT_CH ('"');
770		1293
771	key = decode_str (dec);	1294	// heuristic: assume that
772	if (!key)	1295	// a) decode_str + hv_store_ent are abysmally slow.
773	goto fail;	1296	// b) most hash keys are short, simple ascii text.
		1297	// => try to "fast-match" such strings to avoid
		1298	// the overhead of decode_str + hv_store_ent.
		1299	{
		1300	SV *value;
		1301	char *p = dec->cur;
		1302	char *e = p + 24; // only try up to 24 bytes
774		1303
775	WS; EXPECT_CH (':');	1304	for (;;)
776
777	value = decode_sv (dec);
778	if (!value)
779	{	1305	{
		1306	// the >= 0x80 is false on most architectures
		1307	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1308	{
		1309	// slow path, back up and use decode_str
		1310	SV *key = decode_str (dec);
		1311	if (!key)
		1312	goto fail;
		1313
		1314	decode_ws (dec); EXPECT_CH (':');
		1315
		1316	decode_ws (dec);
		1317	value = decode_sv (dec);
		1318	if (!value)
		1319	{
		1320	SvREFCNT_dec (key);
		1321	goto fail;
		1322	}
		1323
		1324	hv_store_ent (hv, key, value, 0);
780	SvREFCNT_dec (key);	1325	SvREFCNT_dec (key);
		1326
		1327	break;
		1328	}
		1329	else if (*p == '"')
		1330	{
		1331	// fast path, got a simple key
		1332	char *key = dec->cur;
		1333	int len = p - key;
		1334	dec->cur = p + 1;
		1335
		1336	decode_ws (dec); EXPECT_CH (':');
		1337
		1338	decode_ws (dec);
		1339	value = decode_sv (dec);
		1340	if (!value)
781	goto fail;	1341	goto fail;
		1342
		1343	hv_store (hv, key, len, value, 0);
		1344
		1345	break;
		1346	}
		1347
		1348	++p;
782	}	1349	}
783
784	//TODO: optimise
785	hv_store_ent (hv, key, value, 0);
786
787	WS;	1350	}
		1351
		1352	decode_ws (dec);
788		1353
789	if (*dec->cur == '}')	1354	if (*dec->cur == '}')
790	{	1355	{
791	++dec->cur;	1356	++dec->cur;
792	break;	1357	break;
…		…
794		1359
795	if (*dec->cur != ',')	1360	if (*dec->cur != ',')
796	ERR (", or } expected while parsing object/hash");	1361	ERR (", or } expected while parsing object/hash");
797		1362
798	++dec->cur;	1363	++dec->cur;
		1364
		1365	decode_ws (dec);
		1366
		1367	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1368	{
		1369	++dec->cur;
		1370	break;
		1371	}
799	}	1372	}
800		1373
		1374	DEC_DEC_DEPTH;
801	return newRV_noinc ((SV *)hv);	1375	sv = newRV_noinc ((SV *)hv);
		1376
		1377	// check filter callbacks
		1378	if (dec->json.flags & F_HOOK)
		1379	{
		1380	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1381	{
		1382	HE *cb, *he;
		1383
		1384	hv_iterinit (hv);
		1385	he = hv_iternext (hv);
		1386	hv_iterinit (hv);
		1387
		1388	// the next line creates a mortal sv each time its called.
		1389	// might want to optimise this for common cases.
		1390	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1391
		1392	if (cb)
		1393	{
		1394	dSP;
		1395	int count;
		1396
		1397	ENTER; SAVETMPS; PUSHMARK (SP);
		1398	XPUSHs (HeVAL (he));
		1399
		1400	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1401
		1402	if (count == 1)
		1403	{
		1404	sv = newSVsv (POPs);
		1405	FREETMPS; LEAVE;
		1406	return sv;
		1407	}
		1408
		1409	FREETMPS; LEAVE;
		1410	}
		1411	}
		1412
		1413	if (dec->json.cb_object)
		1414	{
		1415	dSP;
		1416	int count;
		1417
		1418	ENTER; SAVETMPS; PUSHMARK (SP);
		1419	XPUSHs (sv_2mortal (sv));
		1420
		1421	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1422
		1423	if (count == 1)
		1424	{
		1425	sv = newSVsv (POPs);
		1426	FREETMPS; LEAVE;
		1427	return sv;
		1428	}
		1429
		1430	SvREFCNT_inc (sv);
		1431	FREETMPS; LEAVE;
		1432	}
		1433	}
		1434
		1435	return sv;
802		1436
803	fail:	1437	fail:
804	SvREFCNT_dec (hv);	1438	SvREFCNT_dec (hv);
		1439	DEC_DEC_DEPTH;
805	return 0;	1440	return 0;
806	}	1441	}
807		1442
808	static SV *	1443	static SV *
809	decode_sv (dec_t *dec)	1444	decode_sv (dec_t *dec)
810	{	1445	{
811	WS;	1446	// the beauty of JSON: you need exactly one character lookahead
		1447	// to parse everything.
812	switch (*dec->cur)	1448	switch (*dec->cur)
813	{	1449	{
814	case '"': ++dec->cur; return decode_str (dec);	1450	case '"': ++dec->cur; return decode_str (dec);
815	case '[': ++dec->cur; return decode_av (dec);	1451	case '[': ++dec->cur; return decode_av (dec);
816	case '{': ++dec->cur; return decode_hv (dec);	1452	case '{': ++dec->cur; return decode_hv (dec);
817		1453
818	case '-':	1454	case '-':
819	case '0': case '1': case '2': case '3': case '4':	1455	case '0': case '1': case '2': case '3': case '4':
820	case '5': case '6': case '7': case '8': case '9':	1456	case '5': case '6': case '7': case '8': case '9':
821	return decode_num (dec);	1457	return decode_num (dec);
822		1458
823	case 't':	1459	case 't':
824	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1460	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
825	{	1461	{
826	dec->cur += 4;	1462	dec->cur += 4;
		1463	#if JSON_SLOW
		1464	json_true = get_bool ("JSON::XS::true");
		1465	#endif
827	return newSViv (1);	1466	return newSVsv (json_true);
828	}	1467	}
829	else	1468	else
830	ERR ("'true' expected");	1469	ERR ("'true' expected");
831		1470
832	break;	1471	break;
833		1472
834	case 'f':	1473	case 'f':
835	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1474	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
836	{	1475	{
837	dec->cur += 5;	1476	dec->cur += 5;
		1477	#if JSON_SLOW
		1478	json_false = get_bool ("JSON::XS::false");
		1479	#endif
838	return newSViv (0);	1480	return newSVsv (json_false);
839	}	1481	}
840	else	1482	else
841	ERR ("'false' expected");	1483	ERR ("'false' expected");
842		1484
843	break;	1485	break;
…		…
852	ERR ("'null' expected");	1494	ERR ("'null' expected");
853		1495
854	break;	1496	break;
855		1497
856	default:	1498	default:
857	ERR ("malformed json string, neither array, object, number, string or atom");	1499	ERR ("malformed JSON string, neither array, object, number, string or atom");
858	break;	1500	break;
859	}	1501	}
860		1502
861	fail:	1503	fail:
862	return 0;	1504	return 0;
863	}	1505	}
864		1506
865	static SV *	1507	static SV *
866	decode_json (SV *string, UV flags)	1508	decode_json (SV *string, JSON *json, char **offset_return)
867	{	1509	{
		1510	dec_t dec;
868	SV *sv;	1511	SV *sv;
869		1512
		1513	/* work around bugs in 5.10 where manipulating magic values
		1514	* will perl ignore the magic in subsequent accesses
		1515	*/
		1516	/*SvGETMAGIC (string);*/
		1517	if (SvMAGICAL (string))
		1518	string = sv_2mortal (newSVsv (string));
		1519
		1520	SvUPGRADE (string, SVt_PV);
		1521
		1522	/* work around a bug in perl 5.10, which causes SvCUR to fail an
		1523	* assertion with -DDEBUGGING, although SvCUR is documented to
		1524	* return the xpv_cur field which certainly exists after upgrading.
		1525	* according to nicholas clark, calling SvPOK fixes this.
		1526	* But it doesn't fix it, so try another workaround, call SvPV_nolen
		1527	* and hope for the best.
		1528	* Damnit, SvPV_nolen still trips over yet another assertion. This
		1529	* assertion business is seriously broken, try yet another workaround
		1530	* for the broken -DDEBUGGING.
		1531	*/
		1532	{
		1533	#ifdef DEBUGGING
		1534	STRLEN offset = SvOK (string) ? sv_len (string) : 0;
		1535	#else
		1536	STRLEN offset = SvCUR (string);
		1537	#endif
		1538
		1539	if (offset > json->max_size && json->max_size)
		1540	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1541	(unsigned long)SvCUR (string), (unsigned long)json->max_size);
		1542	}
		1543
870	if (flags & F_UTF8)	1544	if (json->flags & F_UTF8)
871	sv_utf8_downgrade (string, 0);	1545	sv_utf8_downgrade (string, 0);
872	else	1546	else
873	sv_utf8_upgrade (string);	1547	sv_utf8_upgrade (string);
874		1548
875	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1549	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
876		1550
877	dec_t dec;	1551	dec.json = *json;
878	dec.flags = flags;
879	dec.cur = SvPVX (string);	1552	dec.cur = SvPVX (string);
880	dec.end = SvEND (string);	1553	dec.end = SvEND (string);
881	dec.err = 0;	1554	dec.err = 0;
		1555	dec.depth = 0;
882		1556
		1557	if (dec.json.cb_object || dec.json.cb_sk_object)
		1558	dec.json.flags |= F_HOOK;
		1559
		1560	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1561
		1562	decode_ws (&dec);
883	sv = decode_sv (&dec);	1563	sv = decode_sv (&dec);
884		1564
		1565	if (offset_return)
		1566	*offset_return = dec.cur;
		1567
		1568	if (!(offset_return || !sv))
		1569	{
		1570	// check for trailing garbage
		1571	decode_ws (&dec);
		1572
		1573	if (*dec.cur)
		1574	{
		1575	dec.err = "garbage after JSON object";
		1576	SvREFCNT_dec (sv);
		1577	sv = 0;
		1578	}
		1579	}
		1580
885	if (!sv)	1581	if (!sv)
886	{	1582	{
887	IV offset = dec.flags & F_UTF8
888	? dec.cur - SvPVX (string)
889	: utf8_distance (dec.cur, SvPVX (string));
890	SV *uni = sv_newmortal ();	1583	SV *uni = sv_newmortal ();
891		1584
892	// horrible hack to silence warning inside pv_uni_display	1585	// horrible hack to silence warning inside pv_uni_display
893	COP cop = *PL_curcop;	1586	COP cop = *PL_curcop;
894	cop.cop_warnings = pWARN_NONE;	1587	cop.cop_warnings = pWARN_NONE;
…		…
896	SAVEVPTR (PL_curcop);	1589	SAVEVPTR (PL_curcop);
897	PL_curcop = &cop;	1590	PL_curcop = &cop;
898	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1591	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
899	LEAVE;	1592	LEAVE;
900		1593
901	croak ("%s, at character offset %d (%s)",	1594	croak ("%s, at character offset %d (before \"%s\")",
902	dec.err,	1595	dec.err,
903	(int)offset,	1596	ptr_to_index (string, dec.cur),
904	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1597	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
905	}	1598	}
906		1599
907	sv = sv_2mortal (sv);	1600	sv = sv_2mortal (sv);
908		1601
909	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1602	if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
910	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");	1603	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
911		1604
912	return sv;	1605	return sv;
913	}	1606	}
914		1607
		1608	/////////////////////////////////////////////////////////////////////////////
		1609	// incremental parser
		1610
		1611	static void
		1612	incr_parse (JSON *self)
		1613	{
		1614	const char *p = SvPVX (self->incr_text) + self->incr_pos;
		1615
		1616	// the state machine here is a bit convoluted and could be simplified a lot
		1617	// but this would make it slower, so...
		1618
		1619	for (;;)
		1620	{
		1621	//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
		1622	switch (self->incr_mode)
		1623	{
		1624	// only used for initial whitespace skipping
		1625	case INCR_M_WS:
		1626	for (;;)
		1627	{
		1628	if (*p > 0x20)
		1629	{
		1630	if (*p == '#')
		1631	{
		1632	self->incr_mode = INCR_M_C0;
		1633	goto incr_m_c;
		1634	}
		1635	else
		1636	{
		1637	self->incr_mode = INCR_M_JSON;
		1638	goto incr_m_json;
		1639	}
		1640	}
		1641	else if (!*p)
		1642	goto interrupt;
		1643
		1644	++p;
		1645	}
		1646
		1647	// skip a single char inside a string (for \\-processing)
		1648	case INCR_M_BS:
		1649	if (!*p)
		1650	goto interrupt;
		1651
		1652	++p;
		1653	self->incr_mode = INCR_M_STR;
		1654	goto incr_m_str;
		1655
		1656	// inside #-style comments
		1657	case INCR_M_C0:
		1658	case INCR_M_C1:
		1659	incr_m_c:
		1660	for (;;)
		1661	{
		1662	if (*p == '\n')
		1663	{
		1664	self->incr_mode = self->incr_mode == INCR_M_C0 ? INCR_M_WS : INCR_M_JSON;
		1665	break;
		1666	}
		1667	else if (!*p)
		1668	goto interrupt;
		1669
		1670	++p;
		1671	}
		1672
		1673	break;
		1674
		1675	// inside a string
		1676	case INCR_M_STR:
		1677	incr_m_str:
		1678	for (;;)
		1679	{
		1680	if (*p == '"')
		1681	{
		1682	++p;
		1683	self->incr_mode = INCR_M_JSON;
		1684
		1685	if (!self->incr_nest)
		1686	goto interrupt;
		1687
		1688	goto incr_m_json;
		1689	}
		1690	else if (*p == '\\')
		1691	{
		1692	++p; // "virtually" consumes character after \
		1693
		1694	if (!*p) // if at end of string we have to switch modes
		1695	{
		1696	self->incr_mode = INCR_M_BS;
		1697	goto interrupt;
		1698	}
		1699	}
		1700	else if (!*p)
		1701	goto interrupt;
		1702
		1703	++p;
		1704	}
		1705
		1706	// after initial ws, outside string
		1707	case INCR_M_JSON:
		1708	incr_m_json:
		1709	for (;;)
		1710	{
		1711	switch (*p++)
		1712	{
		1713	case 0:
		1714	--p;
		1715	goto interrupt;
		1716
		1717	case 0x09:
		1718	case 0x0a:
		1719	case 0x0d:
		1720	case 0x20:
		1721	if (!self->incr_nest)
		1722	{
		1723	--p; // do not eat the whitespace, let the next round do it
		1724	goto interrupt;
		1725	}
		1726	break;
		1727
		1728	case '"':
		1729	self->incr_mode = INCR_M_STR;
		1730	goto incr_m_str;
		1731
		1732	case '[':
		1733	case '{':
		1734	if (++self->incr_nest > self->max_depth)
		1735	croak (ERR_NESTING_EXCEEDED);
		1736	break;
		1737
		1738	case ']':
		1739	case '}':
		1740	if (--self->incr_nest <= 0)
		1741	goto interrupt;
		1742	break;
		1743
		1744	case '#':
		1745	self->incr_mode = INCR_M_C1;
		1746	goto incr_m_c;
		1747	}
		1748	}
		1749	}
		1750
		1751	modechange:
		1752	;
		1753	}
		1754
		1755	interrupt:
		1756	self->incr_pos = p - SvPVX (self->incr_text);
		1757	//printf ("interrupt<%.*s>\n", self->incr_pos, SvPVX(self->incr_text));//D
		1758	//printf ("return pos %d mode %d nest %d\n", self->incr_pos, self->incr_mode, self->incr_nest);//D
		1759	}
		1760
		1761	/////////////////////////////////////////////////////////////////////////////
		1762	// XS interface functions
		1763
915	MODULE = JSON::XS PACKAGE = JSON::XS	1764	MODULE = JSON::XS PACKAGE = JSON::XS
916		1765
917	BOOT:	1766	BOOT:
918	{	1767	{
919	int i;	1768	int i;
920		1769
921	memset (decode_hexdigit, 0xff, 256);
922	for (i = 10; i--; )	1770	for (i = 0; i < 256; ++i)
923	decode_hexdigit ['0' + i] = i;	1771	decode_hexdigit [i] =
		1772	i >= '0' && i <= '9' ? i - '0'
		1773	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1774	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1775	: -1;
924		1776
925	for (i = 7; i--; )
926	{
927	decode_hexdigit ['a' + i] = 10 + i;
928	decode_hexdigit ['A' + i] = 10 + i;
929	}
930
931	json_stash = gv_stashpv ("JSON::XS", 1);	1777	json_stash = gv_stashpv ("JSON::XS" , 1);
		1778	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1779
		1780	json_true = get_bool ("JSON::XS::true");
		1781	json_false = get_bool ("JSON::XS::false");
		1782
		1783	CvNODEBUG_on (get_cv ("JSON::XS::incr_text", 0)); /* the debugger completely breaks lvalue subs */
932	}	1784	}
933		1785
934	PROTOTYPES: DISABLE	1786	PROTOTYPES: DISABLE
935		1787
936	SV *new (char *dummy)	1788	void CLONE (...)
937	CODE:	1789	CODE:
938	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1790	json_stash = 0;
		1791	json_boolean_stash = 0;
		1792
		1793	void new (char *klass)
		1794	PPCODE:
		1795	{
		1796	SV *pv = NEWSV (0, sizeof (JSON));
		1797	SvPOK_only (pv);
		1798	json_init ((JSON *)SvPVX (pv));
		1799	XPUSHs (sv_2mortal (sv_bless (
		1800	newRV_noinc (pv),
		1801	strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
		1802	)));
		1803	}
		1804
		1805	void ascii (JSON *self, int enable = 1)
		1806	ALIAS:
		1807	ascii = F_ASCII
		1808	latin1 = F_LATIN1
		1809	utf8 = F_UTF8
		1810	indent = F_INDENT
		1811	canonical = F_CANONICAL
		1812	space_before = F_SPACE_BEFORE
		1813	space_after = F_SPACE_AFTER
		1814	pretty = F_PRETTY
		1815	allow_nonref = F_ALLOW_NONREF
		1816	shrink = F_SHRINK
		1817	allow_blessed = F_ALLOW_BLESSED
		1818	convert_blessed = F_CONV_BLESSED
		1819	relaxed = F_RELAXED
		1820	allow_unknown = F_ALLOW_UNKNOWN
		1821	PPCODE:
		1822	{
		1823	if (enable)
		1824	self->flags |= ix;
		1825	else
		1826	self->flags &= ~ix;
		1827
		1828	XPUSHs (ST (0));
		1829	}
		1830
		1831	void get_ascii (JSON *self)
		1832	ALIAS:
		1833	get_ascii = F_ASCII
		1834	get_latin1 = F_LATIN1
		1835	get_utf8 = F_UTF8
		1836	get_indent = F_INDENT
		1837	get_canonical = F_CANONICAL
		1838	get_space_before = F_SPACE_BEFORE
		1839	get_space_after = F_SPACE_AFTER
		1840	get_allow_nonref = F_ALLOW_NONREF
		1841	get_shrink = F_SHRINK
		1842	get_allow_blessed = F_ALLOW_BLESSED
		1843	get_convert_blessed = F_CONV_BLESSED
		1844	get_relaxed = F_RELAXED
		1845	get_allow_unknown = F_ALLOW_UNKNOWN
		1846	PPCODE:
		1847	XPUSHs (boolSV (self->flags & ix));
		1848
		1849	void max_depth (JSON *self, U32 max_depth = 0x80000000UL)
		1850	PPCODE:
		1851	self->max_depth = max_depth;
		1852	XPUSHs (ST (0));
		1853
		1854	U32 get_max_depth (JSON *self)
		1855	CODE:
		1856	RETVAL = self->max_depth;
939	OUTPUT:	1857	OUTPUT:
940	RETVAL	1858	RETVAL
941		1859
942	SV *ascii (SV *self, int enable = 1)	1860	void max_size (JSON *self, U32 max_size = 0)
943	ALIAS:	1861	PPCODE:
944	ascii = F_ASCII	1862	self->max_size = max_size;
945	utf8 = F_UTF8	1863	XPUSHs (ST (0));
946	indent = F_INDENT	1864
947	canonical = F_CANONICAL	1865	int get_max_size (JSON *self)
948	space_before = F_SPACE_BEFORE
949	space_after = F_SPACE_AFTER
950	pretty = F_PRETTY
951	allow_nonref = F_ALLOW_NONREF
952	shrink = F_SHRINK
953	CODE:	1866	CODE:
954	{	1867	RETVAL = self->max_size;
955	UV *uv = SvJSON (self);
956	if (enable)
957	*uv |= ix;
958	else
959	*uv &= ~ix;
960
961	RETVAL = newSVsv (self);
962	}
963	OUTPUT:	1868	OUTPUT:
964	RETVAL	1869	RETVAL
965		1870
966	void encode (SV *self, SV *scalar)	1871	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
967	PPCODE:	1872	PPCODE:
968	XPUSHs (encode_json (scalar, *SvJSON (self)));	1873	{
		1874	SvREFCNT_dec (self->cb_object);
		1875	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
969		1876
970	void decode (SV *self, SV *jsonstr)	1877	XPUSHs (ST (0));
		1878	}
		1879
		1880	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
971	PPCODE:	1881	PPCODE:
		1882	{
		1883	if (!self->cb_sk_object)
		1884	self->cb_sk_object = newHV ();
		1885
		1886	if (SvOK (cb))
		1887	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1888	else
		1889	{
		1890	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
		1891
		1892	if (!HvKEYS (self->cb_sk_object))
		1893	{
		1894	SvREFCNT_dec (self->cb_sk_object);
		1895	self->cb_sk_object = 0;
		1896	}
		1897	}
		1898
		1899	XPUSHs (ST (0));
		1900	}
		1901
		1902	void encode (JSON *self, SV *scalar)
		1903	PPCODE:
		1904	XPUSHs (encode_json (scalar, self));
		1905
		1906	void decode (JSON *self, SV *jsonstr)
		1907	PPCODE:
972	XPUSHs (decode_json (jsonstr, *SvJSON (self)));	1908	XPUSHs (decode_json (jsonstr, self, 0));
		1909
		1910	void decode_prefix (JSON *self, SV *jsonstr)
		1911	PPCODE:
		1912	{
		1913	char *offset;
		1914	EXTEND (SP, 2);
		1915	PUSHs (decode_json (jsonstr, self, &offset));
		1916	PUSHs (sv_2mortal (newSVuv (ptr_to_index (jsonstr, offset))));
		1917	}
		1918
		1919	void incr_parse (JSON *self, SV *jsonstr = 0)
		1920	PPCODE:
		1921	{
		1922	if (!self->incr_text)
		1923	self->incr_text = newSVpvn ("", 0);
		1924
		1925	// append data, if any
		1926	if (jsonstr)
		1927	{
		1928	if (SvUTF8 (jsonstr))
		1929	{
		1930	if (!SvUTF8 (self->incr_text))
		1931	{
		1932	/* utf-8-ness differs, need to upgrade */
		1933	sv_utf8_upgrade (self->incr_text);
		1934
		1935	if (self->incr_pos)
		1936	self->incr_pos = utf8_hop ((U8 *)SvPVX (self->incr_text), self->incr_pos)
		1937	- (U8 *)SvPVX (self->incr_text);
		1938	}
		1939	}
		1940	else if (SvUTF8 (self->incr_text))
		1941	sv_utf8_upgrade (jsonstr);
		1942
		1943	{
		1944	STRLEN len;
		1945	const char *str = SvPV (jsonstr, len);
		1946	STRLEN cur = SvCUR (self->incr_text);
		1947
		1948	if (SvLEN (self->incr_text) <= cur + len)
		1949	SvGROW (self->incr_text, cur + (len < (cur >> 2) ? cur >> 2 : len) + 1);
		1950
		1951	Move (str, SvEND (self->incr_text), len, char);
		1952	SvCUR_set (self->incr_text, SvCUR (self->incr_text) + len);
		1953	*SvEND (self->incr_text) = 0; // this should basically be a nop, too, but make sure it's there
		1954	}
		1955	}
		1956
		1957	if (GIMME_V != G_VOID)
		1958	do
		1959	{
		1960	char *offset;
		1961
		1962	if (!INCR_DONE (self))
		1963	{
		1964	incr_parse (self);
		1965
		1966	if (self->incr_pos > self->max_size && self->max_size)
		1967	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1968	(unsigned long)self->incr_pos, (unsigned long)self->max_size);
		1969
		1970	if (!INCR_DONE (self))
		1971	break;
		1972	}
		1973
		1974	XPUSHs (decode_json (self->incr_text, self, &offset));
		1975
		1976	self->incr_pos -= offset - SvPVX (self->incr_text);
		1977	self->incr_nest = 0;
		1978	self->incr_mode = 0;
		1979
		1980	sv_chop (self->incr_text, offset);
		1981	}
		1982	while (GIMME_V == G_ARRAY);
		1983	}
		1984
		1985	SV *incr_text (JSON *self)
		1986	ATTRS: lvalue
		1987	CODE:
		1988	{
		1989	if (self->incr_pos)
		1990	croak ("incr_text can not be called when the incremental parser already started parsing");
		1991
		1992	RETVAL = self->incr_text ? SvREFCNT_inc (self->incr_text) : &PL_sv_undef;
		1993	}
		1994	OUTPUT:
		1995	RETVAL
		1996
		1997	void incr_skip (JSON *self)
		1998	CODE:
		1999	{
		2000	if (self->incr_pos)
		2001	{
		2002	sv_chop (self->incr_text, SvPV_nolen (self->incr_text) + self->incr_pos);
		2003	self->incr_pos = 0;
		2004	self->incr_nest = 0;
		2005	self->incr_mode = 0;
		2006	}
		2007	}
		2008
		2009	void incr_reset (JSON *self)
		2010	CODE:
		2011	{
		2012	SvREFCNT_dec (self->incr_text);
		2013	self->incr_text = 0;
		2014	self->incr_pos = 0;
		2015	self->incr_nest = 0;
		2016	self->incr_mode = 0;
		2017	}
		2018
		2019	void DESTROY (JSON *self)
		2020	CODE:
		2021	SvREFCNT_dec (self->cb_sk_object);
		2022	SvREFCNT_dec (self->cb_object);
		2023	SvREFCNT_dec (self->incr_text);
973		2024
974	PROTOTYPES: ENABLE	2025	PROTOTYPES: ENABLE
975		2026
976	void to_json (SV *scalar)	2027	void encode_json (SV *scalar)
		2028	ALIAS:
		2029	to_json_ = 0
		2030	encode_json = F_UTF8
977	PPCODE:	2031	PPCODE:
		2032	{
		2033	JSON json;
		2034	json_init (&json);
		2035	json.flags |= ix;
978	XPUSHs (encode_json (scalar, F_UTF8));	2036	XPUSHs (encode_json (scalar, &json));
		2037	}
979		2038
980	void from_json (SV *jsonstr)	2039	void decode_json (SV *jsonstr)
		2040	ALIAS:
		2041	from_json_ = 0
		2042	decode_json = F_UTF8
981	PPCODE:	2043	PPCODE:
		2044	{
		2045	JSON json;
		2046	json_init (&json);
		2047	json.flags |= ix;
982	XPUSHs (decode_json (jsonstr, F_UTF8));	2048	XPUSHs (decode_json (jsonstr, &json, 0));
		2049	}
983		2050

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