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Comparing JSON-XS/XS.xs (file contents):
Revision 1.13 by root, Sat Mar 24 22:55:16 2007 UTC vs.
Revision 1.71 by root, Wed Mar 19 03:17:38 2008 UTC

1	#include "EXTERN.h"	1	#include "EXTERN.h"
2	#include "perl.h"	2	#include "perl.h"
3	#include "XSUB.h"	3	#include "XSUB.h"
4		4
5	#include "assert.h"	5	#include <assert.h>
6	#include "string.h"	6	#include <string.h>
7	#include "stdlib.h"	7	#include <stdlib.h>
		8	#include <stdio.h>
		9	#include <float.h>
8		10
		11	#if defined(__BORLANDC__) || defined(_MSC_VER)
		12	# define snprintf _snprintf // C compilers have this in stdio.h
		13	#endif
		14
		15	// some old perls do not have this, try to make it work, no
		16	// guarentees, though. if it breaks, you get to keep the pieces.
		17	#ifndef UTF8_MAXBYTES
		18	# define UTF8_MAXBYTES 13
		19	#endif
		20
9	#define F_ASCII 0x00000001	21	#define F_ASCII 0x00000001UL
		22	#define F_LATIN1 0x00000002UL
10	#define F_UTF8 0x00000002	23	#define F_UTF8 0x00000004UL
11	#define F_INDENT 0x00000004	24	#define F_INDENT 0x00000008UL
12	#define F_CANONICAL 0x00000008	25	#define F_CANONICAL 0x00000010UL
13	#define F_SPACE_BEFORE 0x00000010	26	#define F_SPACE_BEFORE 0x00000020UL
14	#define F_SPACE_AFTER 0x00000020	27	#define F_SPACE_AFTER 0x00000040UL
15	#define F_ALLOW_NONREF 0x00000080	28	#define F_ALLOW_NONREF 0x00000100UL
16	#define F_SHRINK 0x00000100	29	#define F_SHRINK 0x00000200UL
		30	#define F_ALLOW_BLESSED 0x00000400UL
		31	#define F_CONV_BLESSED 0x00000800UL
		32	#define F_RELAXED 0x00001000UL
		33
		34	#define F_MAXDEPTH 0xf8000000UL
		35	#define S_MAXDEPTH 27
		36	#define F_MAXSIZE 0x01f00000UL
		37	#define S_MAXSIZE 20
		38	#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
		39
		40	#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
		41	#define DEC_SIZE(flags) (1UL << ((flags & F_MAXSIZE ) >> S_MAXSIZE ))
17		42
18	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	43	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
19	#define F_DEFAULT 0	44	#define F_DEFAULT (9UL << S_MAXDEPTH)
20		45
21	#define INIT_SIZE 32 // initial scalar size to be allocated	46	#define INIT_SIZE 32 // initial scalar size to be allocated
22	#define INDENT_STEP 3 // spaces per indentation level	47	#define INDENT_STEP 3 // spaces per indentation level
23		48
24	#define UTF8_MAX_LEN 11 // for perls UTF-X: max. number of octets per character
25	#define SHORT_STRING_LEN 256 // special-case strings of up to this size	49	#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
26		50
27	#define SB do {	51	#define SB do {
28	#define SE } while (0)	52	#define SE } while (0)
29		53
		54	#if __GNUC__ >= 3
		55	# define expect(expr,value) __builtin_expect ((expr), (value))
		56	# define INLINE static inline
		57	#else
		58	# define expect(expr,value) (expr)
		59	# define INLINE static
		60	#endif
		61
		62	#define expect_false(expr) expect ((expr) != 0, 0)
		63	#define expect_true(expr) expect ((expr) != 0, 1)
		64
		65	#ifdef USE_ITHREADS
		66	# define JSON_SLOW 1
		67	# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
		68	#else
		69	# define JSON_SLOW 0
		70	# define JSON_STASH json_stash
		71	#endif
		72
30	static HV *json_stash; // JSON::XS::	73	static HV *json_stash, *json_boolean_stash; // JSON::XS::
		74	static SV *json_true, *json_false;
		75
		76	typedef struct {
		77	U32 flags;
		78	SV *cb_object;
		79	HV *cb_sk_object;
		80	} JSON;
31		81
32	/////////////////////////////////////////////////////////////////////////////	82	/////////////////////////////////////////////////////////////////////////////
33	// utility functions	83	// utility functions
34		84
35	static UV *	85	INLINE void
36	SvJSON (SV *sv)
37	{
38	if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
39	croak ("object is not of type JSON::XS");
40
41	return &SvUVX (SvRV (sv));
42	}
43
44	static void
45	shrink (SV *sv)	86	shrink (SV *sv)
46	{	87	{
47	sv_utf8_downgrade (sv, 1);	88	sv_utf8_downgrade (sv, 1);
48	if (SvLEN (sv) > SvCUR (sv) + 1)	89	if (SvLEN (sv) > SvCUR (sv) + 1)
49	{	90	{
…		…
58	// decode an utf-8 character and return it, or (UV)-1 in	99	// decode an utf-8 character and return it, or (UV)-1 in
59	// case of an error.	100	// case of an error.
60	// we special-case "safe" characters from U+80 .. U+7FF,	101	// we special-case "safe" characters from U+80 .. U+7FF,
61	// but use the very good perl function to parse anything else.	102	// but use the very good perl function to parse anything else.
62	// note that we never call this function for a ascii codepoints	103	// note that we never call this function for a ascii codepoints
63	static UV	104	INLINE UV
64	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)	105	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
65	{	106	{
66	if (s[0] > 0xdf || s[0] < 0xc2)	107	if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
67	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);	108	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
68	else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)	109	else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
69	{	110	{
70	*clen = 2;	111	*clen = 2;
71	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);	112	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
72	}	113	}
73	else	114	else
		115	{
		116	*clen = (STRLEN)-1;
74	return (UV)-1;	117	return (UV)-1;
		118	}
75	}	119	}
76		120
77	/////////////////////////////////////////////////////////////////////////////	121	/////////////////////////////////////////////////////////////////////////////
78	// encoder	122	// encoder
79		123
…		…
81	typedef struct	125	typedef struct
82	{	126	{
83	char *cur; // SvPVX (sv) + current output position	127	char *cur; // SvPVX (sv) + current output position
84	char *end; // SvEND (sv)	128	char *end; // SvEND (sv)
85	SV *sv; // result scalar	129	SV *sv; // result scalar
86	UV flags; // F_*	130	JSON json;
87	int indent; // indentation level	131	U32 indent; // indentation level
88	int max_depth; // max. recursion level	132	U32 maxdepth; // max. indentation/recursion level
		133	UV limit; // escape character values >= this value when encoding
89	} enc_t;	134	} enc_t;
90		135
91	static void	136	INLINE void
92	need (enc_t *enc, STRLEN len)	137	need (enc_t *enc, STRLEN len)
93	{	138	{
94	if (enc->cur + len >= enc->end)	139	if (expect_false (enc->cur + len >= enc->end))
95	{	140	{
96	STRLEN cur = enc->cur - SvPVX (enc->sv);	141	STRLEN cur = enc->cur - SvPVX (enc->sv);
97	SvGROW (enc->sv, cur + len + 1);	142	SvGROW (enc->sv, cur + len + 1);
98	enc->cur = SvPVX (enc->sv) + cur;	143	enc->cur = SvPVX (enc->sv) + cur;
99	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv);	144	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
100	}	145	}
101	}	146	}
102		147
103	static void	148	INLINE void
104	encode_ch (enc_t *enc, char ch)	149	encode_ch (enc_t *enc, char ch)
105	{	150	{
106	need (enc, 1);	151	need (enc, 1);
107	*enc->cur++ = ch;	152	*enc->cur++ = ch;
108	}	153	}
…		…
116		161
117	while (str < end)	162	while (str < end)
118	{	163	{
119	unsigned char ch = *(unsigned char *)str;	164	unsigned char ch = *(unsigned char *)str;
120		165
121	if (ch >= 0x20 && ch < 0x80) // most common case	166	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
122	{	167	{
123	if (ch == '"') // but with slow exceptions	168	if (expect_false (ch == '"')) // but with slow exceptions
124	{	169	{
125	need (enc, len += 1);	170	need (enc, len += 1);
126	*enc->cur++ = '\\';	171	*enc->cur++ = '\\';
127	*enc->cur++ = '"';	172	*enc->cur++ = '"';
128	}	173	}
129	else if (ch == '\\')	174	else if (expect_false (ch == '\\'))
130	{	175	{
131	need (enc, len += 1);	176	need (enc, len += 1);
132	*enc->cur++ = '\\';	177	*enc->cur++ = '\\';
133	*enc->cur++ = '\\';	178	*enc->cur++ = '\\';
134	}	179	}
…		…
152	STRLEN clen;	197	STRLEN clen;
153	UV uch;	198	UV uch;
154		199
155	if (is_utf8)	200	if (is_utf8)
156	{	201	{
157	//uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);
158	uch = decode_utf8 (str, end - str, &clen);	202	uch = decode_utf8 (str, end - str, &clen);
159	if (clen == (STRLEN)-1)	203	if (clen == (STRLEN)-1)
160	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);	204	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
161	}	205	}
162	else	206	else
163	{	207	{
164	uch = ch;	208	uch = ch;
165	clen = 1;	209	clen = 1;
166	}	210	}
167		211
168	if (uch > 0x10FFFFUL)
169	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
170
171	if (uch < 0x80 || enc->flags & F_ASCII)	212	if (uch < 0x20 || uch >= enc->limit)
172	{	213	{
173	if (uch > 0xFFFFUL)	214	if (uch > 0xFFFFUL)
174	{	215	{
		216	if (uch > 0x10FFFFUL)
		217	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
		218
175	need (enc, len += 11);	219	need (enc, len += 11);
176	sprintf (enc->cur, "\\u%04x\\u%04x",	220	sprintf (enc->cur, "\\u%04x\\u%04x",
177	(int)((uch - 0x10000) / 0x400 + 0xD800),	221	(int)((uch - 0x10000) / 0x400 + 0xD800),
178	(int)((uch - 0x10000) % 0x400 + 0xDC00));	222	(int)((uch - 0x10000) % 0x400 + 0xDC00));
179	enc->cur += 12;	223	enc->cur += 12;
…		…
190	*enc->cur++ = hexdigit [(uch >> 0) & 15];	234	*enc->cur++ = hexdigit [(uch >> 0) & 15];
191	}	235	}
192		236
193	str += clen;	237	str += clen;
194	}	238	}
		239	else if (enc->json.flags & F_LATIN1)
		240	{
		241	*enc->cur++ = uch;
		242	str += clen;
		243	}
195	else if (is_utf8)	244	else if (is_utf8)
196	{	245	{
197	need (enc, len += clen);	246	need (enc, len += clen);
198	do	247	do
199	{	248	{
…		…
201	}	250	}
202	while (--clen);	251	while (--clen);
203	}	252	}
204	else	253	else
205	{	254	{
206	need (enc, len += UTF8_MAX_LEN - 1); // never more than 11 bytes needed	255	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
207	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);	256	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
208	++str;	257	++str;
209	}	258	}
210	}	259	}
211	}	260	}
…		…
213		262
214	--len;	263	--len;
215	}	264	}
216	}	265	}
217		266
218	static void	267	INLINE void
219	encode_indent (enc_t *enc)	268	encode_indent (enc_t *enc)
220	{	269	{
221	if (enc->flags & F_INDENT)	270	if (enc->json.flags & F_INDENT)
222	{	271	{
223	int spaces = enc->indent * INDENT_STEP;	272	int spaces = enc->indent * INDENT_STEP;
224		273
225	need (enc, spaces);	274	need (enc, spaces);
226	memset (enc->cur, ' ', spaces);	275	memset (enc->cur, ' ', spaces);
227	enc->cur += spaces;	276	enc->cur += spaces;
228	}	277	}
229	}	278	}
230		279
231	static void	280	INLINE void
232	encode_space (enc_t *enc)	281	encode_space (enc_t *enc)
233	{	282	{
234	need (enc, 1);	283	need (enc, 1);
235	encode_ch (enc, ' ');	284	encode_ch (enc, ' ');
236	}	285	}
237		286
238	static void	287	INLINE void
239	encode_nl (enc_t *enc)	288	encode_nl (enc_t *enc)
240	{	289	{
241	if (enc->flags & F_INDENT)	290	if (enc->json.flags & F_INDENT)
242	{	291	{
243	need (enc, 1);	292	need (enc, 1);
244	encode_ch (enc, '\n');	293	encode_ch (enc, '\n');
245	}	294	}
246	}	295	}
247		296
248	static void	297	INLINE void
249	encode_comma (enc_t *enc)	298	encode_comma (enc_t *enc)
250	{	299	{
251	encode_ch (enc, ',');	300	encode_ch (enc, ',');
252		301
253	if (enc->flags & F_INDENT)	302	if (enc->json.flags & F_INDENT)
254	encode_nl (enc);	303	encode_nl (enc);
255	else if (enc->flags & F_SPACE_AFTER)	304	else if (enc->json.flags & F_SPACE_AFTER)
256	encode_space (enc);	305	encode_space (enc);
257	}	306	}
258		307
259	static void encode_sv (enc_t *enc, SV *sv);	308	static void encode_sv (enc_t *enc, SV *sv);
260		309
261	static void	310	static void
262	encode_av (enc_t *enc, AV *av)	311	encode_av (enc_t *enc, AV *av)
263	{	312	{
264	int i, len = av_len (av);	313	int i, len = av_len (av);
265		314
266	encode_ch (enc, '['); encode_nl (enc);	315	if (enc->indent >= enc->maxdepth)
267	++enc->indent;	316	croak ("data structure too deep (hit recursion limit)");
268		317
		318	encode_ch (enc, '[');
		319
		320	if (len >= 0)
		321	{
		322	encode_nl (enc); ++enc->indent;
		323
269	for (i = 0; i <= len; ++i)	324	for (i = 0; i <= len; ++i)
270	{	325	{
		326	SV **svp = av_fetch (av, i, 0);
		327
271	encode_indent (enc);	328	encode_indent (enc);
272	encode_sv (enc, *av_fetch (av, i, 0));
273		329
		330	if (svp)
		331	encode_sv (enc, *svp);
		332	else
		333	encode_str (enc, "null", 4, 0);
		334
274	if (i < len)	335	if (i < len)
275	encode_comma (enc);	336	encode_comma (enc);
276	}	337	}
277		338
		339	encode_nl (enc); --enc->indent; encode_indent (enc);
		340	}
		341
278	encode_nl (enc);	342	encode_ch (enc, ']');
279
280	--enc->indent;
281	encode_indent (enc); encode_ch (enc, ']');
282	}	343	}
283		344
284	static void	345	static void
285	encode_he (enc_t *enc, HE *he)	346	encode_hk (enc_t *enc, HE *he)
286	{	347	{
287	encode_ch (enc, '"');	348	encode_ch (enc, '"');
288		349
289	if (HeKLEN (he) == HEf_SVKEY)	350	if (HeKLEN (he) == HEf_SVKEY)
290	{	351	{
…		…
300	else	361	else
301	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	362	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
302		363
303	encode_ch (enc, '"');	364	encode_ch (enc, '"');
304		365
305	if (enc->flags & F_SPACE_BEFORE) encode_space (enc);	366	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
306	encode_ch (enc, ':');	367	encode_ch (enc, ':');
307	if (enc->flags & F_SPACE_AFTER ) encode_space (enc);	368	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
308	encode_sv (enc, HeVAL (he));
309	}	369	}
310		370
311	// compare hash entries, used when all keys are bytestrings	371	// compare hash entries, used when all keys are bytestrings
312	static int	372	static int
313	he_cmp_fast (const void *a_, const void *b_)	373	he_cmp_fast (const void *a_, const void *b_)
…		…
318	HE *b = *(HE **)b_;	378	HE *b = *(HE **)b_;
319		379
320	STRLEN la = HeKLEN (a);	380	STRLEN la = HeKLEN (a);
321	STRLEN lb = HeKLEN (b);	381	STRLEN lb = HeKLEN (b);
322		382
323	if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	383	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
324	cmp = la - lb;	384	cmp = lb - la;
325		385
326	return cmp;	386	return cmp;
327	}	387	}
328		388
329	// compare hash entries, used when some keys are sv's or utf-x	389	// compare hash entries, used when some keys are sv's or utf-x
330	static int	390	static int
331	he_cmp_slow (const void *a, const void *b)	391	he_cmp_slow (const void *a, const void *b)
332	{	392	{
333	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	393	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
334	}	394	}
335		395
336	static void	396	static void
337	encode_hv (enc_t *enc, HV *hv)	397	encode_hv (enc_t *enc, HV *hv)
338	{	398	{
		399	HE *he;
339	int count, i;	400	int count;
340		401
341	encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;	402	if (enc->indent >= enc->maxdepth)
		403	croak ("data structure too deep (hit recursion limit)");
342		404
343	if ((count = hv_iterinit (hv)))	405	encode_ch (enc, '{');
344	{	406
345	// for canonical output we have to sort by keys first	407	// for canonical output we have to sort by keys first
346	// actually, this is mostly due to the stupid so-called	408	// actually, this is mostly due to the stupid so-called
347	// security workaround added somewhere in 5.8.x.	409	// security workaround added somewhere in 5.8.x.
348	// that randomises hash orderings	410	// that randomises hash orderings
349	if (enc->flags & F_CANONICAL)	411	if (enc->json.flags & F_CANONICAL)
		412	{
		413	int count = hv_iterinit (hv);
		414
		415	if (SvMAGICAL (hv))
350	{	416	{
		417	// need to count by iterating. could improve by dynamically building the vector below
		418	// but I don't care for the speed of this special case.
		419	// note also that we will run into undefined behaviour when the two iterations
		420	// do not result in the same count, something I might care for in some later release.
		421
		422	count = 0;
		423	while (hv_iternext (hv))
		424	++count;
		425
		426	hv_iterinit (hv);
		427	}
		428
		429	if (count)
		430	{
		431	int i, fast = 1;
		432	#if defined(__BORLANDC__) || defined(_MSC_VER)
		433	HE **hes = _alloca (count * sizeof (HE));
		434	#else
351	HE *he, *hes [count]; // if your compiler dies here, you need to enable C99 mode	435	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
352	int fast = 1;	436	#endif
353		437
354	i = 0;	438	i = 0;
355	while ((he = hv_iternext (hv)))	439	while ((he = hv_iternext (hv)))
356	{	440	{
357	hes [i++] = he;	441	hes [i++] = he;
…		…
379		463
380	FREETMPS;	464	FREETMPS;
381	LEAVE;	465	LEAVE;
382	}	466	}
383		467
384	for (i = 0; i < count; ++i)	468	encode_nl (enc); ++enc->indent;
		469
		470	while (count--)
385	{	471	{
386	encode_indent (enc);	472	encode_indent (enc);
		473	he = hes [count];
387	encode_he (enc, hes [i]);	474	encode_hk (enc, he);
		475	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
388		476
389	if (i < count - 1)	477	if (count)
390	encode_comma (enc);	478	encode_comma (enc);
391	}	479	}
392		480
		481	encode_nl (enc); --enc->indent; encode_indent (enc);
		482	}
		483	}
		484	else
		485	{
		486	if (hv_iterinit (hv) || SvMAGICAL (hv))
		487	if ((he = hv_iternext (hv)))
		488	{
		489	encode_nl (enc); ++enc->indent;
		490
		491	for (;;)
		492	{
393	encode_nl (enc);	493	encode_indent (enc);
		494	encode_hk (enc, he);
		495	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
		496
		497	if (!(he = hv_iternext (hv)))
		498	break;
		499
		500	encode_comma (enc);
		501	}
		502
		503	encode_nl (enc); --enc->indent; encode_indent (enc);
		504	}
		505	}
		506
		507	encode_ch (enc, '}');
		508	}
		509
		510	// encode objects, arrays and special \0=false and \1=true values.
		511	static void
		512	encode_rv (enc_t *enc, SV *sv)
		513	{
		514	svtype svt;
		515
		516	SvGETMAGIC (sv);
		517	svt = SvTYPE (sv);
		518
		519	if (expect_false (SvOBJECT (sv)))
		520	{
		521	HV *stash = !JSON_SLOW || json_boolean_stash
		522	? json_boolean_stash
		523	: gv_stashpv ("JSON::XS::Boolean", 1);
		524
		525	if (SvSTASH (sv) == stash)
		526	{
		527	if (SvIV (sv))
		528	encode_str (enc, "true", 4, 0);
		529	else
		530	encode_str (enc, "false", 5, 0);
394	}	531	}
395	else	532	else
396	{	533	{
397	SV *sv;	534	#if 0
398	HE *he = hv_iternext (hv);	535	if (0 && sv_derived_from (rv, "JSON::Literal"))
399
400	for (;;)
401	{	536	{
402	encode_indent (enc);	537	// not yet
403	encode_he (enc, he);
404
405	if (!(he = hv_iternext (hv)))
406	break;
407
408	encode_comma (enc);
409	}	538	}
		539	#endif
		540	if (enc->json.flags & F_CONV_BLESSED)
		541	{
		542	// we re-bless the reference to get overload and other niceties right
		543	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
410		544
		545	if (to_json)
		546	{
		547	dSP;
		548
		549	ENTER; SAVETMPS; PUSHMARK (SP);
		550	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		551
		552	// calling with G_SCALAR ensures that we always get a 1 return value
		553	PUTBACK;
		554	call_sv ((SV *)GvCV (to_json), G_SCALAR);
		555	SPAGAIN;
		556
		557	// catch this surprisingly common error
		558	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		559	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		560
		561	sv = POPs;
		562	PUTBACK;
		563
411	encode_nl (enc);	564	encode_sv (enc, sv);
		565
		566	FREETMPS; LEAVE;
		567	}
		568	else if (enc->json.flags & F_ALLOW_BLESSED)
		569	encode_str (enc, "null", 4, 0);
		570	else
		571	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		572	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		573	}
		574	else if (enc->json.flags & F_ALLOW_BLESSED)
		575	encode_str (enc, "null", 4, 0);
		576	else
		577	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		578	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
412	}	579	}
413	}	580	}
		581	else if (svt == SVt_PVHV)
		582	encode_hv (enc, (HV *)sv);
		583	else if (svt == SVt_PVAV)
		584	encode_av (enc, (AV *)sv);
		585	else if (svt < SVt_PVAV)
		586	{
		587	STRLEN len = 0;
		588	char *pv = svt ? SvPV (sv, len) : 0;
414		589
415	--enc->indent; encode_indent (enc); encode_ch (enc, '}');	590	if (len == 1 && *pv == '1')
		591	encode_str (enc, "true", 4, 0);
		592	else if (len == 1 && *pv == '0')
		593	encode_str (enc, "false", 5, 0);
		594	else
		595	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		596	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		597	}
		598	else
		599	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		600	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
416	}	601	}
417		602
418	static void	603	static void
419	encode_sv (enc_t *enc, SV *sv)	604	encode_sv (enc_t *enc, SV *sv)
420	{	605	{
…		…
428	encode_str (enc, str, len, SvUTF8 (sv));	613	encode_str (enc, str, len, SvUTF8 (sv));
429	encode_ch (enc, '"');	614	encode_ch (enc, '"');
430	}	615	}
431	else if (SvNOKp (sv))	616	else if (SvNOKp (sv))
432	{	617	{
		618	// trust that perl will do the right thing w.r.t. JSON syntax.
433	need (enc, NV_DIG + 32);	619	need (enc, NV_DIG + 32);
434	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	620	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
435	enc->cur += strlen (enc->cur);	621	enc->cur += strlen (enc->cur);
436	}	622	}
437	else if (SvIOKp (sv))	623	else if (SvIOKp (sv))
438	{	624	{
439	need (enc, 64);	625	// we assume we can always read an IV as a UV
		626	if (SvUV (sv) & ~(UV)0x7fff)
		627	{
		628	// large integer, use the (rather slow) snprintf way.
		629	need (enc, sizeof (UV) * 3);
440	enc->cur +=	630	enc->cur +=
441	SvIsUV(sv)	631	SvIsUV(sv)
442	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	632	? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
443	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	633	: snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
		634	}
		635	else
		636	{
		637	// optimise the "small number case"
		638	// code will likely be branchless and use only a single multiplication
		639	I32 i = SvIV (sv);
		640	U32 u;
		641	char digit, nz = 0;
		642
		643	need (enc, 6);
		644
		645	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		646	u = i < 0 ? -i : i;
		647
		648	// convert to 4.28 fixed-point representation
		649	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		650
		651	// now output digit by digit, each time masking out the integer part
		652	// and multiplying by 5 while moving the decimal point one to the right,
		653	// resulting in a net multiplication by 10.
		654	// we always write the digit to memory but conditionally increment
		655	// the pointer, to ease the usage of conditional move instructions.
		656	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
		657	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
		658	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
		659	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
		660	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		661	}
444	}	662	}
445	else if (SvROK (sv))	663	else if (SvROK (sv))
446	{	664	encode_rv (enc, SvRV (sv));
447	SV *rv = SvRV (sv);
448
449	if (enc->indent >= enc->max_depth)
450	croak ("data structure too deep (hit recursion limit)");
451
452	switch (SvTYPE (rv))
453	{
454	case SVt_PVAV: encode_av (enc, (AV *)rv); break;
455	case SVt_PVHV: encode_hv (enc, (HV *)rv); break;
456
457	default:
458	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
459	SvPV_nolen (sv));
460	}
461	}
462	else if (!SvOK (sv))	665	else if (!SvOK (sv))
463	encode_str (enc, "null", 4, 0);	666	encode_str (enc, "null", 4, 0);
464	else	667	else
465	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",	668	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
466	SvPV_nolen (sv), SvFLAGS (sv));	669	SvPV_nolen (sv), SvFLAGS (sv));
467	}	670	}
468		671
469	static SV *	672	static SV *
470	encode_json (SV *scalar, UV flags)	673	encode_json (SV *scalar, JSON *json)
471	{	674	{
		675	enc_t enc;
		676
472	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))	677	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
473	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");	678	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
474		679
475	enc_t enc;	680	enc.json = *json;
476	enc.flags = flags;
477	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	681	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
478	enc.cur = SvPVX (enc.sv);	682	enc.cur = SvPVX (enc.sv);
479	enc.end = SvEND (enc.sv);	683	enc.end = SvEND (enc.sv);
480	enc.indent = 0;	684	enc.indent = 0;
481	enc.max_depth = 0x7fffffffUL;	685	enc.maxdepth = DEC_DEPTH (enc.json.flags);
		686	enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
		687	: enc.json.flags & F_LATIN1 ? 0x000100UL
		688	: 0x10FFFFUL;
482		689
483	SvPOK_only (enc.sv);	690	SvPOK_only (enc.sv);
484	encode_sv (&enc, scalar);	691	encode_sv (&enc, scalar);
485		692
		693	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		694	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		695
486	if (!(flags & (F_ASCII | F_UTF8)))	696	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
487	SvUTF8_on (enc.sv);	697	SvUTF8_on (enc.sv);
488		698
489	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
490
491	if (enc.flags & F_SHRINK)	699	if (enc.json.flags & F_SHRINK)
492	shrink (enc.sv);	700	shrink (enc.sv);
493		701
494	return enc.sv;	702	return enc.sv;
495	}	703	}
496		704
…		…
501	typedef struct	709	typedef struct
502	{	710	{
503	char *cur; // current parser pointer	711	char *cur; // current parser pointer
504	char *end; // end of input string	712	char *end; // end of input string
505	const char *err; // parse error, if != 0	713	const char *err; // parse error, if != 0
506	UV flags; // F_*	714	JSON json;
		715	U32 depth; // recursion depth
		716	U32 maxdepth; // recursion depth limit
507	} dec_t;	717	} dec_t;
508		718
509	static void	719	INLINE void
		720	decode_comment (dec_t *dec)
		721	{
		722	// only '#'-style comments allowed a.t.m.
		723
		724	while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
		725	++dec->cur;
		726	}
		727
		728	INLINE void
510	decode_ws (dec_t *dec)	729	decode_ws (dec_t *dec)
511	{	730	{
512	for (;;)	731	for (;;)
513	{	732	{
514	char ch = *dec->cur;	733	char ch = *dec->cur;
515		734
516	if (ch > 0x20	735	if (ch > 0x20)
		736	{
		737	if (expect_false (ch == '#'))
		738	{
		739	if (dec->json.flags & F_RELAXED)
		740	decode_comment (dec);
		741	else
		742	break;
		743	}
		744	else
		745	break;
		746	}
517	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))	747	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
518	break;	748	break; // parse error, but let higher level handle it, gives better error messages
519		749
520	++dec->cur;	750	++dec->cur;
521	}	751	}
522	}	752	}
523		753
524	#define ERR(reason) SB dec->err = reason; goto fail; SE	754	#define ERR(reason) SB dec->err = reason; goto fail; SE
		755
525	#define EXPECT_CH(ch) SB \	756	#define EXPECT_CH(ch) SB \
526	if (*dec->cur != ch) \	757	if (*dec->cur != ch) \
527	ERR (# ch " expected"); \	758	ERR (# ch " expected"); \
528	++dec->cur; \	759	++dec->cur; \
529	SE	760	SE
530		761
		762	#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
		763	#define DEC_DEC_DEPTH --dec->depth
		764
531	static SV *decode_sv (dec_t *dec);	765	static SV *decode_sv (dec_t *dec);
532		766
533	static signed char decode_hexdigit[256];	767	static signed char decode_hexdigit[256];
534		768
535	static UV	769	static UV
536	decode_4hex (dec_t *dec)	770	decode_4hex (dec_t *dec)
537	{	771	{
538	signed char d1, d2, d3, d4;	772	signed char d1, d2, d3, d4;
539	unsigned char *cur = (unsigned char *)dec->cur;	773	unsigned char *cur = (unsigned char *)dec->cur;
540		774
541	d1 = decode_hexdigit [cur [0]]; if (d1 < 0) ERR ("four hexadecimal digits expected");	775	d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
542	d2 = decode_hexdigit [cur [1]]; if (d2 < 0) ERR ("four hexadecimal digits expected");	776	d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
543	d3 = decode_hexdigit [cur [2]]; if (d3 < 0) ERR ("four hexadecimal digits expected");	777	d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
544	d4 = decode_hexdigit [cur [3]]; if (d4 < 0) ERR ("four hexadecimal digits expected");	778	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
545		779
546	dec->cur += 4;	780	dec->cur += 4;
547		781
548	return ((UV)d1) << 12	782	return ((UV)d1) << 12
549	| ((UV)d2) << 8	783	| ((UV)d2) << 8
…		…
557	static SV *	791	static SV *
558	decode_str (dec_t *dec)	792	decode_str (dec_t *dec)
559	{	793	{
560	SV *sv = 0;	794	SV *sv = 0;
561	int utf8 = 0;	795	int utf8 = 0;
		796	char *dec_cur = dec->cur;
562		797
563	do	798	do
564	{	799	{
565	char buf [SHORT_STRING_LEN + UTF8_MAX_LEN];	800	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
566	char *cur = buf;	801	char *cur = buf;
567		802
568	do	803	do
569	{	804	{
570	unsigned char ch = *(unsigned char *)dec->cur++;	805	unsigned char ch = *(unsigned char *)dec_cur++;
571		806
572	if (ch == '"')	807	if (expect_false (ch == '"'))
573	{	808	{
574	--dec->cur;	809	--dec_cur;
575	break;	810	break;
576	}	811	}
577	else if (ch == '\\')	812	else if (expect_false (ch == '\\'))
578	{	813	{
579	switch (*dec->cur)	814	switch (*dec_cur)
580	{	815	{
581	case '\\':	816	case '\\':
582	case '/':	817	case '/':
583	case '"': *cur++ = *dec->cur++; break;	818	case '"': *cur++ = *dec_cur++; break;
584		819
585	case 'b': ++dec->cur; *cur++ = '\010'; break;	820	case 'b': ++dec_cur; *cur++ = '\010'; break;
586	case 't': ++dec->cur; *cur++ = '\011'; break;	821	case 't': ++dec_cur; *cur++ = '\011'; break;
587	case 'n': ++dec->cur; *cur++ = '\012'; break;	822	case 'n': ++dec_cur; *cur++ = '\012'; break;
588	case 'f': ++dec->cur; *cur++ = '\014'; break;	823	case 'f': ++dec_cur; *cur++ = '\014'; break;
589	case 'r': ++dec->cur; *cur++ = '\015'; break;	824	case 'r': ++dec_cur; *cur++ = '\015'; break;
590		825
591	case 'u':	826	case 'u':
592	{	827	{
593	UV lo, hi;	828	UV lo, hi;
594	++dec->cur;	829	++dec_cur;
595		830
		831	dec->cur = dec_cur;
596	hi = decode_4hex (dec);	832	hi = decode_4hex (dec);
		833	dec_cur = dec->cur;
597	if (hi == (UV)-1)	834	if (hi == (UV)-1)
598	goto fail;	835	goto fail;
599		836
600	// possibly a surrogate pair	837	// possibly a surrogate pair
601	if (hi >= 0xd800)	838	if (hi >= 0xd800)
602	if (hi < 0xdc00)	839	if (hi < 0xdc00)
603	{	840	{
604	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	841	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
605	ERR ("missing low surrogate character in surrogate pair");	842	ERR ("missing low surrogate character in surrogate pair");
606		843
607	dec->cur += 2;	844	dec_cur += 2;
608		845
		846	dec->cur = dec_cur;
609	lo = decode_4hex (dec);	847	lo = decode_4hex (dec);
		848	dec_cur = dec->cur;
610	if (lo == (UV)-1)	849	if (lo == (UV)-1)
611	goto fail;	850	goto fail;
612		851
613	if (lo < 0xdc00 || lo >= 0xe000)	852	if (lo < 0xdc00 || lo >= 0xe000)
614	ERR ("surrogate pair expected");	853	ERR ("surrogate pair expected");
…		…
628	*cur++ = hi;	867	*cur++ = hi;
629	}	868	}
630	break;	869	break;
631		870
632	default:	871	default:
633	--dec->cur;	872	--dec_cur;
634	ERR ("illegal backslash escape sequence in string");	873	ERR ("illegal backslash escape sequence in string");
635	}	874	}
636	}	875	}
637	else if (ch >= 0x20 && ch <= 0x7f)	876	else if (expect_true (ch >= 0x20 && ch <= 0x7f))
638	*cur++ = ch;	877	*cur++ = ch;
639	else if (ch >= 0x80)	878	else if (ch >= 0x80)
640	{	879	{
641	--dec->cur;
642
643	STRLEN clen;	880	STRLEN clen;
		881	UV uch;
		882
		883	--dec_cur;
		884
644	UV uch = decode_utf8 (dec->cur, dec->end - dec->cur, &clen);	885	uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
645	if (clen == (STRLEN)-1)	886	if (clen == (STRLEN)-1)
646	ERR ("malformed UTF-8 character in JSON string");	887	ERR ("malformed UTF-8 character in JSON string");
647		888
648	do	889	do
649	{
650	*cur++ = *dec->cur++;	890	*cur++ = *dec_cur++;
651	}
652	while (--clen);	891	while (--clen);
653		892
654	utf8 = 1;	893	utf8 = 1;
655	}	894	}
656	else if (!ch)
657	ERR ("unexpected end of string while parsing json string");
658	else	895	else
		896	{
		897	--dec_cur;
		898
		899	if (!ch)
		900	ERR ("unexpected end of string while parsing JSON string");
		901	else
659	ERR ("invalid character encountered");	902	ERR ("invalid character encountered while parsing JSON string");
660		903	}
661	}	904	}
662	while (cur < buf + SHORT_STRING_LEN);	905	while (cur < buf + SHORT_STRING_LEN);
663		906
		907	{
664	STRLEN len = cur - buf;	908	STRLEN len = cur - buf;
665		909
666	if (sv)	910	if (sv)
667	{	911	{
668	SvGROW (sv, SvCUR (sv) + len + 1);	912	SvGROW (sv, SvCUR (sv) + len + 1);
669	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);	913	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
670	SvCUR_set (sv, SvCUR (sv) + len);	914	SvCUR_set (sv, SvCUR (sv) + len);
671	}	915	}
672	else	916	else
673	sv = newSVpvn (buf, len);	917	sv = newSVpvn (buf, len);
674	}	918	}
		919	}
675	while (*dec->cur != '"');	920	while (*dec_cur != '"');
676		921
677	++dec->cur;	922	++dec_cur;
678		923
679	if (sv)	924	if (sv)
680	{	925	{
681	SvPOK_only (sv);	926	SvPOK_only (sv);
682	*SvEND (sv) = 0;	927	*SvEND (sv) = 0;
…		…
685	SvUTF8_on (sv);	930	SvUTF8_on (sv);
686	}	931	}
687	else	932	else
688	sv = newSVpvn ("", 0);	933	sv = newSVpvn ("", 0);
689		934
		935	dec->cur = dec_cur;
690	return sv;	936	return sv;
691		937
692	fail:	938	fail:
		939	dec->cur = dec_cur;
693	return 0;	940	return 0;
694	}	941	}
695		942
696	static SV *	943	static SV *
697	decode_num (dec_t *dec)	944	decode_num (dec_t *dec)
…		…
755	is_nv = 1;	1002	is_nv = 1;
756	}	1003	}
757		1004
758	if (!is_nv)	1005	if (!is_nv)
759	{	1006	{
760	UV uv;	1007	int len = dec->cur - start;
761	int numtype = grok_number (start, dec->cur - start, &uv);	1008
762	if (numtype & IS_NUMBER_IN_UV)	1009	// special case the rather common 1..5-digit-int case
763	if (numtype & IS_NUMBER_NEG)	1010	if (*start == '-')
		1011	switch (len)
764	{	1012	{
765	if (uv < (UV)IV_MIN)	1013	case 2: return newSViv (-( start [1] - '0' * 1));
766	return newSViv (-(IV)uv);	1014	case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
		1015	case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		1016	case 5: return newSViv (-( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
		1017	case 6: return newSViv (-(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
767	}	1018	}
		1019	else
		1020	switch (len)
		1021	{
		1022	case 1: return newSViv ( start [0] - '0' * 1);
		1023	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1024	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1025	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1026	case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
		1027	}
		1028
		1029	{
		1030	UV uv;
		1031	int numtype = grok_number (start, len, &uv);
		1032	if (numtype & IS_NUMBER_IN_UV)
		1033	if (numtype & IS_NUMBER_NEG)
		1034	{
		1035	if (uv < (UV)IV_MIN)
		1036	return newSViv (-(IV)uv);
		1037	}
768	else	1038	else
769	return newSVuv (uv);	1039	return newSVuv (uv);
770	}	1040	}
771		1041
		1042	len -= *start == '-' ? 1 : 0;
		1043
		1044	// does not fit into IV or UV, try NV
		1045	if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len)
		1046	#if defined (LDBL_DIG)
		1047	|| (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len)
		1048	#endif
		1049	)
		1050	// fits into NV without loss of precision
		1051	return newSVnv (Atof (start));
		1052
		1053	// everything else fails, convert it to a string
		1054	return newSVpvn (start, dec->cur - start);
		1055	}
		1056
		1057	// loss of precision here
772	return newSVnv (Atof (start));	1058	return newSVnv (Atof (start));
773		1059
774	fail:	1060	fail:
775	return 0;	1061	return 0;
776	}	1062	}
…		…
778	static SV *	1064	static SV *
779	decode_av (dec_t *dec)	1065	decode_av (dec_t *dec)
780	{	1066	{
781	AV *av = newAV ();	1067	AV *av = newAV ();
782		1068
		1069	DEC_INC_DEPTH;
783	decode_ws (dec);	1070	decode_ws (dec);
		1071
784	if (*dec->cur == ']')	1072	if (*dec->cur == ']')
785	++dec->cur;	1073	++dec->cur;
786	else	1074	else
787	for (;;)	1075	for (;;)
788	{	1076	{
…		…
804		1092
805	if (*dec->cur != ',')	1093	if (*dec->cur != ',')
806	ERR (", or ] expected while parsing array");	1094	ERR (", or ] expected while parsing array");
807		1095
808	++dec->cur;	1096	++dec->cur;
		1097
		1098	decode_ws (dec);
		1099
		1100	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1101	{
		1102	++dec->cur;
		1103	break;
		1104	}
809	}	1105	}
810		1106
		1107	DEC_DEC_DEPTH;
811	return newRV_noinc ((SV *)av);	1108	return newRV_noinc ((SV *)av);
812		1109
813	fail:	1110	fail:
814	SvREFCNT_dec (av);	1111	SvREFCNT_dec (av);
		1112	DEC_DEC_DEPTH;
815	return 0;	1113	return 0;
816	}	1114	}
817		1115
818	static SV *	1116	static SV *
819	decode_hv (dec_t *dec)	1117	decode_hv (dec_t *dec)
820	{	1118	{
		1119	SV *sv;
821	HV *hv = newHV ();	1120	HV *hv = newHV ();
822		1121
		1122	DEC_INC_DEPTH;
823	decode_ws (dec);	1123	decode_ws (dec);
		1124
824	if (*dec->cur == '}')	1125	if (*dec->cur == '}')
825	++dec->cur;	1126	++dec->cur;
826	else	1127	else
827	for (;;)	1128	for (;;)
828	{	1129	{
		1130	EXPECT_CH ('"');
		1131
		1132	// heuristic: assume that
		1133	// a) decode_str + hv_store_ent are abysmally slow.
		1134	// b) most hash keys are short, simple ascii text.
		1135	// => try to "fast-match" such strings to avoid
		1136	// the overhead of decode_str + hv_store_ent.
		1137	{
829	SV *key, *value;	1138	SV *value;
		1139	char *p = dec->cur;
		1140	char *e = p + 24; // only try up to 24 bytes
830		1141
831	decode_ws (dec); EXPECT_CH ('"');	1142	for (;;)
832
833	key = decode_str (dec);
834	if (!key)
835	goto fail;
836
837	decode_ws (dec); EXPECT_CH (':');
838
839	value = decode_sv (dec);
840	if (!value)
841	{	1143	{
		1144	// the >= 0x80 is true on most architectures
		1145	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1146	{
		1147	// slow path, back up and use decode_str
		1148	SV *key = decode_str (dec);
		1149	if (!key)
		1150	goto fail;
		1151
		1152	decode_ws (dec); EXPECT_CH (':');
		1153
		1154	decode_ws (dec);
		1155	value = decode_sv (dec);
		1156	if (!value)
		1157	{
		1158	SvREFCNT_dec (key);
		1159	goto fail;
		1160	}
		1161
		1162	hv_store_ent (hv, key, value, 0);
842	SvREFCNT_dec (key);	1163	SvREFCNT_dec (key);
		1164
		1165	break;
		1166	}
		1167	else if (*p == '"')
		1168	{
		1169	// fast path, got a simple key
		1170	char *key = dec->cur;
		1171	int len = p - key;
		1172	dec->cur = p + 1;
		1173
		1174	decode_ws (dec); EXPECT_CH (':');
		1175
		1176	decode_ws (dec);
		1177	value = decode_sv (dec);
		1178	if (!value)
843	goto fail;	1179	goto fail;
		1180
		1181	hv_store (hv, key, len, value, 0);
		1182
		1183	break;
		1184	}
		1185
		1186	++p;
844	}	1187	}
845		1188	}
846	//TODO: optimise
847	hv_store_ent (hv, key, value, 0);
848		1189
849	decode_ws (dec);	1190	decode_ws (dec);
850		1191
851	if (*dec->cur == '}')	1192	if (*dec->cur == '}')
852	{	1193	{
…		…
856		1197
857	if (*dec->cur != ',')	1198	if (*dec->cur != ',')
858	ERR (", or } expected while parsing object/hash");	1199	ERR (", or } expected while parsing object/hash");
859		1200
860	++dec->cur;	1201	++dec->cur;
		1202
		1203	decode_ws (dec);
		1204
		1205	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1206	{
		1207	++dec->cur;
		1208	break;
		1209	}
861	}	1210	}
862		1211
		1212	DEC_DEC_DEPTH;
863	return newRV_noinc ((SV *)hv);	1213	sv = newRV_noinc ((SV *)hv);
		1214
		1215	// check filter callbacks
		1216	if (dec->json.flags & F_HOOK)
		1217	{
		1218	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1219	{
		1220	HE *cb, *he;
		1221
		1222	hv_iterinit (hv);
		1223	he = hv_iternext (hv);
		1224	hv_iterinit (hv);
		1225
		1226	// the next line creates a mortal sv each time its called.
		1227	// might want to optimise this for common cases.
		1228	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1229
		1230	if (cb)
		1231	{
		1232	dSP;
		1233	int count;
		1234
		1235	ENTER; SAVETMPS; PUSHMARK (SP);
		1236	XPUSHs (HeVAL (he));
		1237
		1238	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1239
		1240	if (count == 1)
		1241	{
		1242	sv = newSVsv (POPs);
		1243	FREETMPS; LEAVE;
		1244	return sv;
		1245	}
		1246
		1247	FREETMPS; LEAVE;
		1248	}
		1249	}
		1250
		1251	if (dec->json.cb_object)
		1252	{
		1253	dSP;
		1254	int count;
		1255
		1256	ENTER; SAVETMPS; PUSHMARK (SP);
		1257	XPUSHs (sv_2mortal (sv));
		1258
		1259	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1260
		1261	if (count == 1)
		1262	{
		1263	sv = newSVsv (POPs);
		1264	FREETMPS; LEAVE;
		1265	return sv;
		1266	}
		1267
		1268	SvREFCNT_inc (sv);
		1269	FREETMPS; LEAVE;
		1270	}
		1271	}
		1272
		1273	return sv;
864		1274
865	fail:	1275	fail:
866	SvREFCNT_dec (hv);	1276	SvREFCNT_dec (hv);
		1277	DEC_DEC_DEPTH;
867	return 0;	1278	return 0;
868	}	1279	}
869		1280
870	static SV *	1281	static SV *
871	decode_sv (dec_t *dec)	1282	decode_sv (dec_t *dec)
872	{	1283	{
873	decode_ws (dec);	1284	// the beauty of JSON: you need exactly one character lookahead
		1285	// to parse anything.
874	switch (*dec->cur)	1286	switch (*dec->cur)
875	{	1287	{
876	case '"': ++dec->cur; return decode_str (dec);	1288	case '"': ++dec->cur; return decode_str (dec);
877	case '[': ++dec->cur; return decode_av (dec);	1289	case '[': ++dec->cur; return decode_av (dec);
878	case '{': ++dec->cur; return decode_hv (dec);	1290	case '{': ++dec->cur; return decode_hv (dec);
…		…
884		1296
885	case 't':	1297	case 't':
886	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1298	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
887	{	1299	{
888	dec->cur += 4;	1300	dec->cur += 4;
889	return newSViv (1);	1301	#if JSON_SLOW
		1302	json_true = get_sv ("JSON::XS::true", 1); SvREADONLY_on (json_true);
		1303	#endif
		1304	return SvREFCNT_inc (json_true);
890	}	1305	}
891	else	1306	else
892	ERR ("'true' expected");	1307	ERR ("'true' expected");
893		1308
894	break;	1309	break;
895		1310
896	case 'f':	1311	case 'f':
897	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1312	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
898	{	1313	{
899	dec->cur += 5;	1314	dec->cur += 5;
900	return newSViv (0);	1315	#if JSON_SLOW
		1316	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1317	#endif
		1318	return SvREFCNT_inc (json_false);
901	}	1319	}
902	else	1320	else
903	ERR ("'false' expected");	1321	ERR ("'false' expected");
904		1322
905	break;	1323	break;
…		…
914	ERR ("'null' expected");	1332	ERR ("'null' expected");
915		1333
916	break;	1334	break;
917		1335
918	default:	1336	default:
919	ERR ("malformed json string, neither array, object, number, string or atom");	1337	ERR ("malformed JSON string, neither array, object, number, string or atom");
920	break;	1338	break;
921	}	1339	}
922		1340
923	fail:	1341	fail:
924	return 0;	1342	return 0;
925	}	1343	}
926		1344
927	static SV *	1345	static SV *
928	decode_json (SV *string, UV flags)	1346	decode_json (SV *string, JSON *json, UV *offset_return)
929	{	1347	{
		1348	dec_t dec;
		1349	UV offset;
930	SV *sv;	1350	SV *sv;
931		1351
		1352	SvGETMAGIC (string);
		1353	SvUPGRADE (string, SVt_PV);
		1354
		1355	if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
		1356	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1357	(unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
		1358
932	if (flags & F_UTF8)	1359	if (json->flags & F_UTF8)
933	sv_utf8_downgrade (string, 0);	1360	sv_utf8_downgrade (string, 0);
934	else	1361	else
935	sv_utf8_upgrade (string);	1362	sv_utf8_upgrade (string);
936		1363
937	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1364	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
938		1365
939	dec_t dec;	1366	dec.json = *json;
940	dec.flags = flags;
941	dec.cur = SvPVX (string);	1367	dec.cur = SvPVX (string);
942	dec.end = SvEND (string);	1368	dec.end = SvEND (string);
943	dec.err = 0;	1369	dec.err = 0;
		1370	dec.depth = 0;
		1371	dec.maxdepth = DEC_DEPTH (dec.json.flags);
944		1372
		1373	if (dec.json.cb_object || dec.json.cb_sk_object)
		1374	dec.json.flags |= F_HOOK;
		1375
		1376	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1377
		1378	decode_ws (&dec);
945	sv = decode_sv (&dec);	1379	sv = decode_sv (&dec);
946		1380
		1381	if (!(offset_return || !sv))
		1382	{
		1383	// check for trailing garbage
		1384	decode_ws (&dec);
		1385
		1386	if (*dec.cur)
		1387	{
		1388	dec.err = "garbage after JSON object";
		1389	SvREFCNT_dec (sv);
		1390	sv = 0;
		1391	}
		1392	}
		1393
		1394	if (offset_return || !sv)
		1395	{
		1396	offset = dec.json.flags & F_UTF8
		1397	? dec.cur - SvPVX (string)
		1398	: utf8_distance (dec.cur, SvPVX (string));
		1399
		1400	if (offset_return)
		1401	*offset_return = offset;
		1402	}
		1403
947	if (!sv)	1404	if (!sv)
948	{	1405	{
949	IV offset = dec.flags & F_UTF8
950	? dec.cur - SvPVX (string)
951	: utf8_distance (dec.cur, SvPVX (string));
952	SV *uni = sv_newmortal ();	1406	SV *uni = sv_newmortal ();
953		1407
954	// horrible hack to silence warning inside pv_uni_display	1408	// horrible hack to silence warning inside pv_uni_display
955	COP cop = *PL_curcop;	1409	COP cop = *PL_curcop;
956	cop.cop_warnings = pWARN_NONE;	1410	cop.cop_warnings = pWARN_NONE;
…		…
958	SAVEVPTR (PL_curcop);	1412	SAVEVPTR (PL_curcop);
959	PL_curcop = &cop;	1413	PL_curcop = &cop;
960	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1414	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
961	LEAVE;	1415	LEAVE;
962		1416
963	croak ("%s, at character offset %d (%s)",	1417	croak ("%s, at character offset %d [\"%s\"]",
964	dec.err,	1418	dec.err,
965	(int)offset,	1419	(int)offset,
966	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1420	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
967	}	1421	}
968		1422
969	sv = sv_2mortal (sv);	1423	sv = sv_2mortal (sv);
970		1424
971	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1425	if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
972	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");	1426	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
973		1427
974	return sv;	1428	return sv;
975	}	1429	}
976		1430
…		…
981		1435
982	BOOT:	1436	BOOT:
983	{	1437	{
984	int i;	1438	int i;
985		1439
986	memset (decode_hexdigit, 0xff, 256);
987	for (i = 10; i--; )	1440	for (i = 0; i < 256; ++i)
988	decode_hexdigit ['0' + i] = i;	1441	decode_hexdigit [i] =
		1442	i >= '0' && i <= '9' ? i - '0'
		1443	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1444	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1445	: -1;
989		1446
990	for (i = 7; i--; )
991	{
992	decode_hexdigit ['a' + i] = 10 + i;
993	decode_hexdigit ['A' + i] = 10 + i;
994	}
995
996	json_stash = gv_stashpv ("JSON::XS", 1);	1447	json_stash = gv_stashpv ("JSON::XS" , 1);
		1448	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1449
		1450	json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
		1451	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
997	}	1452	}
998		1453
999	PROTOTYPES: DISABLE	1454	PROTOTYPES: DISABLE
1000		1455
1001	SV *new (char *dummy)	1456	void CLONE (...)
1002	CODE:	1457	CODE:
1003	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1458	json_stash = 0;
		1459	json_boolean_stash = 0;
		1460
		1461	void new (char *klass)
		1462	PPCODE:
		1463	{
		1464	SV *pv = NEWSV (0, sizeof (JSON));
		1465	SvPOK_only (pv);
		1466	Zero (SvPVX (pv), 1, JSON);
		1467	((JSON *)SvPVX (pv))->flags = F_DEFAULT;
		1468	XPUSHs (sv_2mortal (sv_bless (
		1469	newRV_noinc (pv),
		1470	strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
		1471	)));
		1472	}
		1473
		1474	void ascii (JSON *self, int enable = 1)
		1475	ALIAS:
		1476	ascii = F_ASCII
		1477	latin1 = F_LATIN1
		1478	utf8 = F_UTF8
		1479	indent = F_INDENT
		1480	canonical = F_CANONICAL
		1481	space_before = F_SPACE_BEFORE
		1482	space_after = F_SPACE_AFTER
		1483	pretty = F_PRETTY
		1484	allow_nonref = F_ALLOW_NONREF
		1485	shrink = F_SHRINK
		1486	allow_blessed = F_ALLOW_BLESSED
		1487	convert_blessed = F_CONV_BLESSED
		1488	relaxed = F_RELAXED
		1489	PPCODE:
		1490	{
		1491	if (enable)
		1492	self->flags |= ix;
		1493	else
		1494	self->flags &= ~ix;
		1495
		1496	XPUSHs (ST (0));
		1497	}
		1498
		1499	void get_ascii (JSON *self)
		1500	ALIAS:
		1501	get_ascii = F_ASCII
		1502	get_latin1 = F_LATIN1
		1503	get_utf8 = F_UTF8
		1504	get_indent = F_INDENT
		1505	get_canonical = F_CANONICAL
		1506	get_space_before = F_SPACE_BEFORE
		1507	get_space_after = F_SPACE_AFTER
		1508	get_allow_nonref = F_ALLOW_NONREF
		1509	get_shrink = F_SHRINK
		1510	get_allow_blessed = F_ALLOW_BLESSED
		1511	get_convert_blessed = F_CONV_BLESSED
		1512	get_relaxed = F_RELAXED
		1513	PPCODE:
		1514	XPUSHs (boolSV (self->flags & ix));
		1515
		1516	void max_depth (JSON *self, UV max_depth = 0x80000000UL)
		1517	PPCODE:
		1518	{
		1519	UV log2 = 0;
		1520
		1521	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
		1522
		1523	while ((1UL << log2) < max_depth)
		1524	++log2;
		1525
		1526	self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
		1527
		1528	XPUSHs (ST (0));
		1529	}
		1530
		1531	U32 get_max_depth (JSON *self)
		1532	CODE:
		1533	RETVAL = DEC_DEPTH (self->flags);
1004	OUTPUT:	1534	OUTPUT:
1005	RETVAL	1535	RETVAL
1006		1536
1007	SV *ascii (SV *self, int enable = 1)	1537	void max_size (JSON *self, UV max_size = 0)
1008	ALIAS:	1538	PPCODE:
1009	ascii = F_ASCII	1539	{
1010	utf8 = F_UTF8	1540	UV log2 = 0;
1011	indent = F_INDENT	1541
1012	canonical = F_CANONICAL	1542	if (max_size > 0x80000000UL) max_size = 0x80000000UL;
1013	space_before = F_SPACE_BEFORE	1543	if (max_size == 1) max_size = 2;
1014	space_after = F_SPACE_AFTER	1544
1015	pretty = F_PRETTY	1545	while ((1UL << log2) < max_size)
1016	allow_nonref = F_ALLOW_NONREF	1546	++log2;
1017	shrink = F_SHRINK	1547
		1548	self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
		1549
		1550	XPUSHs (ST (0));
		1551	}
		1552
		1553	int get_max_size (JSON *self)
1018	CODE:	1554	CODE:
1019	{	1555	RETVAL = DEC_SIZE (self->flags);
1020	UV *uv = SvJSON (self);
1021	if (enable)
1022	*uv |= ix;
1023	else
1024	*uv &= ~ix;
1025
1026	RETVAL = newSVsv (self);
1027	}
1028	OUTPUT:	1556	OUTPUT:
1029	RETVAL	1557	RETVAL
1030		1558
1031	void encode (SV *self, SV *scalar)	1559	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
1032	PPCODE:	1560	PPCODE:
1033	XPUSHs (encode_json (scalar, *SvJSON (self)));	1561	{
		1562	SvREFCNT_dec (self->cb_object);
		1563	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
1034		1564
1035	void decode (SV *self, SV *jsonstr)	1565	XPUSHs (ST (0));
		1566	}
		1567
		1568	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
1036	PPCODE:	1569	PPCODE:
		1570	{
		1571	if (!self->cb_sk_object)
		1572	self->cb_sk_object = newHV ();
		1573
		1574	if (SvOK (cb))
		1575	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1576	else
		1577	{
		1578	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
		1579
		1580	if (!HvKEYS (self->cb_sk_object))
		1581	{
		1582	SvREFCNT_dec (self->cb_sk_object);
		1583	self->cb_sk_object = 0;
		1584	}
		1585	}
		1586
		1587	XPUSHs (ST (0));
		1588	}
		1589
		1590	void encode (JSON *self, SV *scalar)
		1591	PPCODE:
		1592	XPUSHs (encode_json (scalar, self));
		1593
		1594	void decode (JSON *self, SV *jsonstr)
		1595	PPCODE:
1037	XPUSHs (decode_json (jsonstr, *SvJSON (self)));	1596	XPUSHs (decode_json (jsonstr, self, 0));
		1597
		1598	void decode_prefix (JSON *self, SV *jsonstr)
		1599	PPCODE:
		1600	{
		1601	UV offset;
		1602	EXTEND (SP, 2);
		1603	PUSHs (decode_json (jsonstr, self, &offset));
		1604	PUSHs (sv_2mortal (newSVuv (offset)));
		1605	}
		1606
		1607	void DESTROY (JSON *self)
		1608	CODE:
		1609	SvREFCNT_dec (self->cb_sk_object);
		1610	SvREFCNT_dec (self->cb_object);
1038		1611
1039	PROTOTYPES: ENABLE	1612	PROTOTYPES: ENABLE
1040		1613
1041	void to_json (SV *scalar)	1614	void encode_json (SV *scalar)
1042	PPCODE:	1615	PPCODE:
		1616	{
		1617	JSON json = { F_DEFAULT | F_UTF8 };
1043	XPUSHs (encode_json (scalar, F_UTF8));	1618	XPUSHs (encode_json (scalar, &json));
		1619	}
1044		1620
1045	void from_json (SV *jsonstr)	1621	void decode_json (SV *jsonstr)
1046	PPCODE:	1622	PPCODE:
		1623	{
		1624	JSON json = { F_DEFAULT | F_UTF8 };
1047	XPUSHs (decode_json (jsonstr, F_UTF8));	1625	XPUSHs (decode_json (jsonstr, &json, 0));
		1626	}
1048		1627

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