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Comparing JSON-XS/XS.xs (file contents):
Revision 1.29 by root, Wed May 9 15:34:04 2007 UTC vs.
Revision 1.70 by root, Wed Mar 19 00:44:54 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"	8	#include <stdio.h>
		9	#include <float.h>
9		10
10	#if defined(__BORLANDC__) || defined(_MSC_VER)	11	#if defined(__BORLANDC__) || defined(_MSC_VER)
11	# define snprintf _snprintf // C compilers have this in stdio.h	12	# define snprintf _snprintf // C compilers have this in stdio.h
12	#endif	13	#endif
13		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
14	#define F_ASCII 0x00000001UL	21	#define F_ASCII 0x00000001UL
		22	#define F_LATIN1 0x00000002UL
15	#define F_UTF8 0x00000002UL	23	#define F_UTF8 0x00000004UL
16	#define F_INDENT 0x00000004UL	24	#define F_INDENT 0x00000008UL
17	#define F_CANONICAL 0x00000008UL	25	#define F_CANONICAL 0x00000010UL
18	#define F_SPACE_BEFORE 0x00000010UL	26	#define F_SPACE_BEFORE 0x00000020UL
19	#define F_SPACE_AFTER 0x00000020UL	27	#define F_SPACE_AFTER 0x00000040UL
20	#define F_ALLOW_NONREF 0x00000080UL	28	#define F_ALLOW_NONREF 0x00000100UL
21	#define F_SHRINK 0x00000100UL	29	#define F_SHRINK 0x00000200UL
		30	#define F_ALLOW_BLESSED 0x00000400UL
		31	#define F_CONV_BLESSED 0x00000800UL
		32	#define F_RELAXED 0x00001000UL
		33
22	#define F_MAXDEPTH 0xf8000000UL	34	#define F_MAXDEPTH 0xf8000000UL
23	#define S_MAXDEPTH 27	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
24		39
25	#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))	40	#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
26		41	#define DEC_SIZE(flags) (1UL << ((flags & F_MAXSIZE ) >> S_MAXSIZE ))
27	// F_SELFCONVERT? <=> to_json/toJson
28	// F_BLESSED? <=> { $__class__$ => }
29		42
30	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER	43	#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
31	#define F_DEFAULT (9UL << S_MAXDEPTH)	44	#define F_DEFAULT (9UL << S_MAXDEPTH)
32		45
33	#define INIT_SIZE 32 // initial scalar size to be allocated	46	#define INIT_SIZE 32 // initial scalar size to be allocated
34	#define INDENT_STEP 3 // spaces per indentation level	47	#define INDENT_STEP 3 // spaces per indentation level
35		48
36	#define SHORT_STRING_LEN 512 // special-case strings of up to this size	49	#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
37		50
38	#define SB do {	51	#define SB do {
39	#define SE } while (0)	52	#define SE } while (0)
40		53
		54	#if __GNUC__ >= 3
		55	# define expect(expr,value) __builtin_expect ((expr),(value))
		56	# define inline inline
		57	#else
		58	# define expect(expr,value) (expr)
		59	# define inline static
		60	#endif
		61
		62	#define expect_false(expr) expect ((expr) != 0, 0)
		63	#define expect_true(expr) expect ((expr) != 0, 1)
		64
		65	#ifdef USE_ITHREADS
		66	# define JSON_SLOW 1
		67	# define JSON_STASH (json_stash ? json_stash : gv_stashpv ("JSON::XS", 1))
		68	#else
		69	# define JSON_SLOW 0
		70	# define JSON_STASH json_stash
		71	#endif
		72
41	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;
42		81
43	/////////////////////////////////////////////////////////////////////////////	82	/////////////////////////////////////////////////////////////////////////////
44	// utility functions	83	// utility functions
45		84
46	static UV *	85	inline void
47	SvJSON (SV *sv)
48	{
49	if (!(SvROK (sv) && SvOBJECT (SvRV (sv)) && SvSTASH (SvRV (sv)) == json_stash))
50	croak ("object is not of type JSON::XS");
51
52	return &SvUVX (SvRV (sv));
53	}
54
55	static void
56	shrink (SV *sv)	86	shrink (SV *sv)
57	{	87	{
58	sv_utf8_downgrade (sv, 1);	88	sv_utf8_downgrade (sv, 1);
59	if (SvLEN (sv) > SvCUR (sv) + 1)	89	if (SvLEN (sv) > SvCUR (sv) + 1)
60	{	90	{
…		…
69	// 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
70	// case of an error.	100	// case of an error.
71	// we special-case "safe" characters from U+80 .. U+7FF,	101	// we special-case "safe" characters from U+80 .. U+7FF,
72	// but use the very good perl function to parse anything else.	102	// but use the very good perl function to parse anything else.
73	// note that we never call this function for a ascii codepoints	103	// note that we never call this function for a ascii codepoints
74	static UV	104	inline UV
75	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)	105	decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
76	{	106	{
77	if (s[0] > 0xdf || s[0] < 0xc2)	107	if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
78	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);	108	return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
79	else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)	109	else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
80	{	110	{
81	*clen = 2;	111	*clen = 2;
82	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);	112	return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
…		…
95	typedef struct	125	typedef struct
96	{	126	{
97	char *cur; // SvPVX (sv) + current output position	127	char *cur; // SvPVX (sv) + current output position
98	char *end; // SvEND (sv)	128	char *end; // SvEND (sv)
99	SV *sv; // result scalar	129	SV *sv; // result scalar
100	U32 flags; // F_*	130	JSON json;
101	U32 indent; // indentation level	131	U32 indent; // indentation level
102	U32 maxdepth; // max. indentation/recursion level	132	U32 maxdepth; // max. indentation/recursion level
103	} enc_t;	133	} enc_t;
104		134
105	static void	135	inline void
106	need (enc_t *enc, STRLEN len)	136	need (enc_t *enc, STRLEN len)
107	{	137	{
108	if (enc->cur + len >= enc->end)	138	if (expect_false (enc->cur + len >= enc->end))
109	{	139	{
110	STRLEN cur = enc->cur - SvPVX (enc->sv);	140	STRLEN cur = enc->cur - SvPVX (enc->sv);
111	SvGROW (enc->sv, cur + len + 1);	141	SvGROW (enc->sv, cur + len + 1);
112	enc->cur = SvPVX (enc->sv) + cur;	142	enc->cur = SvPVX (enc->sv) + cur;
113	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;	143	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
114	}	144	}
115	}	145	}
116		146
117	static void	147	inline void
118	encode_ch (enc_t *enc, char ch)	148	encode_ch (enc_t *enc, char ch)
119	{	149	{
120	need (enc, 1);	150	need (enc, 1);
121	*enc->cur++ = ch;	151	*enc->cur++ = ch;
122	}	152	}
…		…
130		160
131	while (str < end)	161	while (str < end)
132	{	162	{
133	unsigned char ch = *(unsigned char *)str;	163	unsigned char ch = *(unsigned char *)str;
134		164
135	if (ch >= 0x20 && ch < 0x80) // most common case	165	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
136	{	166	{
137	if (ch == '"') // but with slow exceptions	167	if (expect_false (ch == '"')) // but with slow exceptions
138	{	168	{
139	need (enc, len += 1);	169	need (enc, len += 1);
140	*enc->cur++ = '\\';	170	*enc->cur++ = '\\';
141	*enc->cur++ = '"';	171	*enc->cur++ = '"';
142	}	172	}
143	else if (ch == '\\')	173	else if (expect_false (ch == '\\'))
144	{	174	{
145	need (enc, len += 1);	175	need (enc, len += 1);
146	*enc->cur++ = '\\';	176	*enc->cur++ = '\\';
147	*enc->cur++ = '\\';	177	*enc->cur++ = '\\';
148	}	178	}
…		…
166	STRLEN clen;	196	STRLEN clen;
167	UV uch;	197	UV uch;
168		198
169	if (is_utf8)	199	if (is_utf8)
170	{	200	{
171	//uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);
172	uch = decode_utf8 (str, end - str, &clen);	201	uch = decode_utf8 (str, end - str, &clen);
173	if (clen == (STRLEN)-1)	202	if (clen == (STRLEN)-1)
174	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);	203	croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
175	}	204	}
176	else	205	else
…		…
180	}	209	}
181		210
182	if (uch > 0x10FFFFUL)	211	if (uch > 0x10FFFFUL)
183	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);	212	croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
184		213
185	if (uch < 0x80 || enc->flags & F_ASCII)	214	if (uch < 0x80 || enc->json.flags & F_ASCII || (enc->json.flags & F_LATIN1 && uch > 0xFF))
186	{	215	{
187	if (uch > 0xFFFFUL)	216	if (uch > 0xFFFFUL)
188	{	217	{
189	need (enc, len += 11);	218	need (enc, len += 11);
190	sprintf (enc->cur, "\\u%04x\\u%04x",	219	sprintf (enc->cur, "\\u%04x\\u%04x",
…		…
204	*enc->cur++ = hexdigit [(uch >> 0) & 15];	233	*enc->cur++ = hexdigit [(uch >> 0) & 15];
205	}	234	}
206		235
207	str += clen;	236	str += clen;
208	}	237	}
		238	else if (enc->json.flags & F_LATIN1)
		239	{
		240	*enc->cur++ = uch;
		241	str += clen;
		242	}
209	else if (is_utf8)	243	else if (is_utf8)
210	{	244	{
211	need (enc, len += clen);	245	need (enc, len += clen);
212	do	246	do
213	{	247	{
…		…
227		261
228	--len;	262	--len;
229	}	263	}
230	}	264	}
231		265
232	static void	266	inline void
233	encode_indent (enc_t *enc)	267	encode_indent (enc_t *enc)
234	{	268	{
235	if (enc->flags & F_INDENT)	269	if (enc->json.flags & F_INDENT)
236	{	270	{
237	int spaces = enc->indent * INDENT_STEP;	271	int spaces = enc->indent * INDENT_STEP;
238		272
239	need (enc, spaces);	273	need (enc, spaces);
240	memset (enc->cur, ' ', spaces);	274	memset (enc->cur, ' ', spaces);
241	enc->cur += spaces;	275	enc->cur += spaces;
242	}	276	}
243	}	277	}
244		278
245	static void	279	inline void
246	encode_space (enc_t *enc)	280	encode_space (enc_t *enc)
247	{	281	{
248	need (enc, 1);	282	need (enc, 1);
249	encode_ch (enc, ' ');	283	encode_ch (enc, ' ');
250	}	284	}
251		285
252	static void	286	inline void
253	encode_nl (enc_t *enc)	287	encode_nl (enc_t *enc)
254	{	288	{
255	if (enc->flags & F_INDENT)	289	if (enc->json.flags & F_INDENT)
256	{	290	{
257	need (enc, 1);	291	need (enc, 1);
258	encode_ch (enc, '\n');	292	encode_ch (enc, '\n');
259	}	293	}
260	}	294	}
261		295
262	static void	296	inline void
263	encode_comma (enc_t *enc)	297	encode_comma (enc_t *enc)
264	{	298	{
265	encode_ch (enc, ',');	299	encode_ch (enc, ',');
266		300
267	if (enc->flags & F_INDENT)	301	if (enc->json.flags & F_INDENT)
268	encode_nl (enc);	302	encode_nl (enc);
269	else if (enc->flags & F_SPACE_AFTER)	303	else if (enc->json.flags & F_SPACE_AFTER)
270	encode_space (enc);	304	encode_space (enc);
271	}	305	}
272		306
273	static void encode_sv (enc_t *enc, SV *sv);	307	static void encode_sv (enc_t *enc, SV *sv);
274		308
…		…
278	int i, len = av_len (av);	312	int i, len = av_len (av);
279		313
280	if (enc->indent >= enc->maxdepth)	314	if (enc->indent >= enc->maxdepth)
281	croak ("data structure too deep (hit recursion limit)");	315	croak ("data structure too deep (hit recursion limit)");
282		316
283	encode_ch (enc, '['); encode_nl (enc);	317	encode_ch (enc, '[');
284	++enc->indent;	318
		319	if (len >= 0)
		320	{
		321	encode_nl (enc); ++enc->indent;
285		322
286	for (i = 0; i <= len; ++i)	323	for (i = 0; i <= len; ++i)
287	{	324	{
		325	SV **svp = av_fetch (av, i, 0);
		326
288	encode_indent (enc);	327	encode_indent (enc);
289	encode_sv (enc, *av_fetch (av, i, 0));
290		328
		329	if (svp)
		330	encode_sv (enc, *svp);
		331	else
		332	encode_str (enc, "null", 4, 0);
		333
291	if (i < len)	334	if (i < len)
292	encode_comma (enc);	335	encode_comma (enc);
293	}	336	}
294		337
		338	encode_nl (enc); --enc->indent; encode_indent (enc);
		339	}
		340
295	encode_nl (enc);	341	encode_ch (enc, ']');
296
297	--enc->indent;
298	encode_indent (enc); encode_ch (enc, ']');
299	}	342	}
300		343
301	static void	344	static void
302	encode_he (enc_t *enc, HE *he)	345	encode_hk (enc_t *enc, HE *he)
303	{	346	{
304	encode_ch (enc, '"');	347	encode_ch (enc, '"');
305		348
306	if (HeKLEN (he) == HEf_SVKEY)	349	if (HeKLEN (he) == HEf_SVKEY)
307	{	350	{
…		…
317	else	360	else
318	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	361	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
319		362
320	encode_ch (enc, '"');	363	encode_ch (enc, '"');
321		364
322	if (enc->flags & F_SPACE_BEFORE) encode_space (enc);	365	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
323	encode_ch (enc, ':');	366	encode_ch (enc, ':');
324	if (enc->flags & F_SPACE_AFTER ) encode_space (enc);	367	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
325	encode_sv (enc, HeVAL (he));
326	}	368	}
327		369
328	// compare hash entries, used when all keys are bytestrings	370	// compare hash entries, used when all keys are bytestrings
329	static int	371	static int
330	he_cmp_fast (const void *a_, const void *b_)	372	he_cmp_fast (const void *a_, const void *b_)
…		…
335	HE *b = *(HE **)b_;	377	HE *b = *(HE **)b_;
336		378
337	STRLEN la = HeKLEN (a);	379	STRLEN la = HeKLEN (a);
338	STRLEN lb = HeKLEN (b);	380	STRLEN lb = HeKLEN (b);
339		381
340	if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	382	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
341	cmp = la - lb;	383	cmp = lb - la;
342		384
343	return cmp;	385	return cmp;
344	}	386	}
345		387
346	// compare hash entries, used when some keys are sv's or utf-x	388	// compare hash entries, used when some keys are sv's or utf-x
347	static int	389	static int
348	he_cmp_slow (const void *a, const void *b)	390	he_cmp_slow (const void *a, const void *b)
349	{	391	{
350	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	392	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
351	}	393	}
352		394
353	static void	395	static void
354	encode_hv (enc_t *enc, HV *hv)	396	encode_hv (enc_t *enc, HV *hv)
355	{	397	{
		398	HE *he;
356	int count, i;	399	int count;
357		400
358	if (enc->indent >= enc->maxdepth)	401	if (enc->indent >= enc->maxdepth)
359	croak ("data structure too deep (hit recursion limit)");	402	croak ("data structure too deep (hit recursion limit)");
360		403
361	encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;	404	encode_ch (enc, '{');
362		405
363	if ((count = hv_iterinit (hv)))
364	{
365	// for canonical output we have to sort by keys first	406	// for canonical output we have to sort by keys first
366	// actually, this is mostly due to the stupid so-called	407	// actually, this is mostly due to the stupid so-called
367	// security workaround added somewhere in 5.8.x.	408	// security workaround added somewhere in 5.8.x.
368	// that randomises hash orderings	409	// that randomises hash orderings
369	if (enc->flags & F_CANONICAL)	410	if (enc->json.flags & F_CANONICAL)
		411	{
		412	int count = hv_iterinit (hv);
		413
		414	if (SvMAGICAL (hv))
370	{	415	{
		416	// need to count by iterating. could improve by dynamically building the vector below
		417	// but I don't care for the speed of this special case.
		418	// note also that we will run into undefined behaviour when the two iterations
		419	// do not result in the same count, something I might care for in some later release.
		420
		421	count = 0;
		422	while (hv_iternext (hv))
		423	++count;
		424
		425	hv_iterinit (hv);
		426	}
		427
		428	if (count)
		429	{
		430	int i, fast = 1;
		431	#if defined(__BORLANDC__) || defined(_MSC_VER)
		432	HE **hes = _alloca (count * sizeof (HE));
		433	#else
371	HE *he, *hes [count]; // if your compiler dies here, you need to enable C99 mode	434	HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
372	int fast = 1;	435	#endif
373		436
374	i = 0;	437	i = 0;
375	while ((he = hv_iternext (hv)))	438	while ((he = hv_iternext (hv)))
376	{	439	{
377	hes [i++] = he;	440	hes [i++] = he;
…		…
399		462
400	FREETMPS;	463	FREETMPS;
401	LEAVE;	464	LEAVE;
402	}	465	}
403		466
404	for (i = 0; i < count; ++i)	467	encode_nl (enc); ++enc->indent;
		468
		469	while (count--)
405	{	470	{
406	encode_indent (enc);	471	encode_indent (enc);
		472	he = hes [count];
407	encode_he (enc, hes [i]);	473	encode_hk (enc, he);
		474	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
408		475
409	if (i < count - 1)	476	if (count)
410	encode_comma (enc);	477	encode_comma (enc);
411	}	478	}
412		479
		480	encode_nl (enc); --enc->indent; encode_indent (enc);
		481	}
		482	}
		483	else
		484	{
		485	if (hv_iterinit (hv) || SvMAGICAL (hv))
		486	if ((he = hv_iternext (hv)))
		487	{
		488	encode_nl (enc); ++enc->indent;
		489
		490	for (;;)
		491	{
413	encode_nl (enc);	492	encode_indent (enc);
		493	encode_hk (enc, he);
		494	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
		495
		496	if (!(he = hv_iternext (hv)))
		497	break;
		498
		499	encode_comma (enc);
		500	}
		501
		502	encode_nl (enc); --enc->indent; encode_indent (enc);
		503	}
		504	}
		505
		506	encode_ch (enc, '}');
		507	}
		508
		509	// encode objects, arrays and special \0=false and \1=true values.
		510	static void
		511	encode_rv (enc_t *enc, SV *sv)
		512	{
		513	svtype svt;
		514
		515	SvGETMAGIC (sv);
		516	svt = SvTYPE (sv);
		517
		518	if (expect_false (SvOBJECT (sv)))
		519	{
		520	HV *stash = !JSON_SLOW || json_boolean_stash
		521	? json_boolean_stash
		522	: gv_stashpv ("JSON::XS::Boolean", 1);
		523
		524	if (SvSTASH (sv) == stash)
		525	{
		526	if (SvIV (sv))
		527	encode_str (enc, "true", 4, 0);
		528	else
		529	encode_str (enc, "false", 5, 0);
414	}	530	}
415	else	531	else
416	{	532	{
417	HE *he = hv_iternext (hv);	533	#if 0
418		534	if (0 && sv_derived_from (rv, "JSON::Literal"))
419	for (;;)
420	{	535	{
421	encode_indent (enc);	536	// not yet
422	encode_he (enc, he);
423
424	if (!(he = hv_iternext (hv)))
425	break;
426
427	encode_comma (enc);
428	}	537	}
		538	#endif
		539	if (enc->json.flags & F_CONV_BLESSED)
		540	{
		541	// we re-bless the reference to get overload and other niceties right
		542	GV *to_json = gv_fetchmethod_autoload (SvSTASH (sv), "TO_JSON", 0);
429		543
		544	if (to_json)
		545	{
		546	dSP;
		547
		548	ENTER; SAVETMPS; PUSHMARK (SP);
		549	XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), SvSTASH (sv)));
		550
		551	// calling with G_SCALAR ensures that we always get a 1 return value
		552	PUTBACK;
		553	call_sv ((SV *)GvCV (to_json), G_SCALAR);
		554	SPAGAIN;
		555
		556	// catch this surprisingly common error
		557	if (SvROK (TOPs) && SvRV (TOPs) == sv)
		558	croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
		559
		560	sv = POPs;
		561	PUTBACK;
		562
430	encode_nl (enc);	563	encode_sv (enc, sv);
		564
		565	FREETMPS; LEAVE;
		566	}
		567	else if (enc->json.flags & F_ALLOW_BLESSED)
		568	encode_str (enc, "null", 4, 0);
		569	else
		570	croak ("encountered object '%s', but neither allow_blessed enabled nor TO_JSON method available on it",
		571	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		572	}
		573	else if (enc->json.flags & F_ALLOW_BLESSED)
		574	encode_str (enc, "null", 4, 0);
		575	else
		576	croak ("encountered object '%s', but neither allow_blessed nor convert_blessed settings are enabled",
		577	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
431	}	578	}
432	}	579	}
433
434	--enc->indent; encode_indent (enc); encode_ch (enc, '}');
435	}
436
437	// encode objects, arrays and special \0=false and \1=true values.
438	static void
439	encode_rv (enc_t *enc, SV *sv)
440	{
441	svtype svt;
442
443	SvGETMAGIC (sv);
444	svt = SvTYPE (sv);
445
446	if (svt == SVt_PVHV)	580	else if (svt == SVt_PVHV)
447	encode_hv (enc, (HV *)sv);	581	encode_hv (enc, (HV *)sv);
448	else if (svt == SVt_PVAV)	582	else if (svt == SVt_PVAV)
449	encode_av (enc, (AV *)sv);	583	encode_av (enc, (AV *)sv);
450	else if (svt < SVt_PVAV)	584	else if (svt < SVt_PVAV)
451	{	585	{
452	if (SvNIOK (sv) && SvIV (sv) == 0)	586	STRLEN len = 0;
		587	char *pv = svt ? SvPV (sv, len) : 0;
		588
		589	if (len == 1 && *pv == '1')
		590	encode_str (enc, "true", 4, 0);
		591	else if (len == 1 && *pv == '0')
453	encode_str (enc, "false", 5, 0);	592	encode_str (enc, "false", 5, 0);
454	else if (SvNIOK (sv) && SvIV (sv) == 1)
455	encode_str (enc, "true", 4, 0);
456	else	593	else
457	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",	594	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
458	SvPV_nolen (sv_2mortal (newRV_inc (sv))));	595	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
459	}	596	}
460	else	597	else
…		…
475	encode_str (enc, str, len, SvUTF8 (sv));	612	encode_str (enc, str, len, SvUTF8 (sv));
476	encode_ch (enc, '"');	613	encode_ch (enc, '"');
477	}	614	}
478	else if (SvNOKp (sv))	615	else if (SvNOKp (sv))
479	{	616	{
		617	// trust that perl will do the right thing w.r.t. JSON syntax.
480	need (enc, NV_DIG + 32);	618	need (enc, NV_DIG + 32);
481	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	619	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
482	enc->cur += strlen (enc->cur);	620	enc->cur += strlen (enc->cur);
483	}	621	}
484	else if (SvIOKp (sv))	622	else if (SvIOKp (sv))
485	{	623	{
486	need (enc, 64);	624	// we assume we can always read an IV as a UV
		625	if (SvUV (sv) & ~(UV)0x7fff)
		626	{
		627	// large integer, use the (rather slow) snprintf way.
		628	need (enc, sizeof (UV) * 3);
487	enc->cur +=	629	enc->cur +=
488	SvIsUV(sv)	630	SvIsUV(sv)
489	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	631	? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
490	: snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv));	632	: snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
		633	}
		634	else
		635	{
		636	// optimise the "small number case"
		637	// code will likely be branchless and use only a single multiplication
		638	I32 i = SvIV (sv);
		639	U32 u;
		640	char digit, nz = 0;
		641
		642	need (enc, 6);
		643
		644	*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
		645	u = i < 0 ? -i : i;
		646
		647	// convert to 4.28 fixed-point representation
		648	u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
		649
		650	// now output digit by digit, each time masking out the integer part
		651	// and multiplying by 5 while moving the decimal point one to the right,
		652	// resulting in a net multiplication by 10.
		653	// we always write the digit to memory but conditionally increment
		654	// the pointer, to ease the usage of conditional move instructions.
		655	digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
		656	digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
		657	digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
		658	digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
		659	digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
		660	}
491	}	661	}
492	else if (SvROK (sv))	662	else if (SvROK (sv))
493	encode_rv (enc, SvRV (sv));	663	encode_rv (enc, SvRV (sv));
494	else if (!SvOK (sv))	664	else if (!SvOK (sv))
495	encode_str (enc, "null", 4, 0);	665	encode_str (enc, "null", 4, 0);
…		…
497	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",	667	croak ("encountered perl type (%s,0x%x) that JSON cannot handle, you might want to report this",
498	SvPV_nolen (sv), SvFLAGS (sv));	668	SvPV_nolen (sv), SvFLAGS (sv));
499	}	669	}
500		670
501	static SV *	671	static SV *
502	encode_json (SV *scalar, U32 flags)	672	encode_json (SV *scalar, JSON *json)
503	{	673	{
504	enc_t enc;	674	enc_t enc;
505		675
506	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))	676	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
507	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");	677	croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
508		678
509	enc.flags = flags;	679	enc.json = *json;
510	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	680	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
511	enc.cur = SvPVX (enc.sv);	681	enc.cur = SvPVX (enc.sv);
512	enc.end = SvEND (enc.sv);	682	enc.end = SvEND (enc.sv);
513	enc.indent = 0;	683	enc.indent = 0;
514	enc.maxdepth = DEC_DEPTH (flags);	684	enc.maxdepth = DEC_DEPTH (enc.json.flags);
515		685
516	SvPOK_only (enc.sv);	686	SvPOK_only (enc.sv);
517	encode_sv (&enc, scalar);	687	encode_sv (&enc, scalar);
518		688
519	if (!(flags & (F_ASCII | F_UTF8)))
520	SvUTF8_on (enc.sv);
521
522	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));	689	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
523	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings	690	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
524		691
		692	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
		693	SvUTF8_on (enc.sv);
		694
525	if (enc.flags & F_SHRINK)	695	if (enc.json.flags & F_SHRINK)
526	shrink (enc.sv);	696	shrink (enc.sv);
527		697
528	return enc.sv;	698	return enc.sv;
529	}	699	}
530		700
…		…
535	typedef struct	705	typedef struct
536	{	706	{
537	char *cur; // current parser pointer	707	char *cur; // current parser pointer
538	char *end; // end of input string	708	char *end; // end of input string
539	const char *err; // parse error, if != 0	709	const char *err; // parse error, if != 0
540	U32 flags; // F_*	710	JSON json;
541	U32 depth; // recursion depth	711	U32 depth; // recursion depth
542	U32 maxdepth; // recursion depth limit	712	U32 maxdepth; // recursion depth limit
543	} dec_t;	713	} dec_t;
544		714
545	static void	715	inline void
		716	decode_comment (dec_t *dec)
		717	{
		718	// only '#'-style comments allowed a.t.m.
		719
		720	while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
		721	++dec->cur;
		722	}
		723
		724	inline void
546	decode_ws (dec_t *dec)	725	decode_ws (dec_t *dec)
547	{	726	{
548	for (;;)	727	for (;;)
549	{	728	{
550	char ch = *dec->cur;	729	char ch = *dec->cur;
551		730
552	if (ch > 0x20	731	if (ch > 0x20)
		732	{
		733	if (expect_false (ch == '#'))
		734	{
		735	if (dec->json.flags & F_RELAXED)
		736	decode_comment (dec);
		737	else
		738	break;
		739	}
		740	else
		741	break;
		742	}
553	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))	743	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
554	break;	744	break; // parse error, but let higher level handle it, gives better error messages
555		745
556	++dec->cur;	746	++dec->cur;
557	}	747	}
558	}	748	}
559		749
…		…
576	decode_4hex (dec_t *dec)	766	decode_4hex (dec_t *dec)
577	{	767	{
578	signed char d1, d2, d3, d4;	768	signed char d1, d2, d3, d4;
579	unsigned char *cur = (unsigned char *)dec->cur;	769	unsigned char *cur = (unsigned char *)dec->cur;
580		770
581	d1 = decode_hexdigit [cur [0]]; if (d1 < 0) ERR ("four hexadecimal digits expected");	771	d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
582	d2 = decode_hexdigit [cur [1]]; if (d2 < 0) ERR ("four hexadecimal digits expected");	772	d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
583	d3 = decode_hexdigit [cur [2]]; if (d3 < 0) ERR ("four hexadecimal digits expected");	773	d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
584	d4 = decode_hexdigit [cur [3]]; if (d4 < 0) ERR ("four hexadecimal digits expected");	774	d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
585		775
586	dec->cur += 4;	776	dec->cur += 4;
587		777
588	return ((UV)d1) << 12	778	return ((UV)d1) << 12
589	| ((UV)d2) << 8	779	| ((UV)d2) << 8
…		…
597	static SV *	787	static SV *
598	decode_str (dec_t *dec)	788	decode_str (dec_t *dec)
599	{	789	{
600	SV *sv = 0;	790	SV *sv = 0;
601	int utf8 = 0;	791	int utf8 = 0;
		792	char *dec_cur = dec->cur;
602		793
603	do	794	do
604	{	795	{
605	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];	796	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
606	char *cur = buf;	797	char *cur = buf;
607		798
608	do	799	do
609	{	800	{
610	unsigned char ch = *(unsigned char *)dec->cur++;	801	unsigned char ch = *(unsigned char *)dec_cur++;
611		802
612	if (ch == '"')	803	if (expect_false (ch == '"'))
613	{	804	{
614	--dec->cur;	805	--dec_cur;
615	break;	806	break;
616	}	807	}
617	else if (ch == '\\')	808	else if (expect_false (ch == '\\'))
618	{	809	{
619	switch (*dec->cur)	810	switch (*dec_cur)
620	{	811	{
621	case '\\':	812	case '\\':
622	case '/':	813	case '/':
623	case '"': *cur++ = *dec->cur++; break;	814	case '"': *cur++ = *dec_cur++; break;
624		815
625	case 'b': ++dec->cur; *cur++ = '\010'; break;	816	case 'b': ++dec_cur; *cur++ = '\010'; break;
626	case 't': ++dec->cur; *cur++ = '\011'; break;	817	case 't': ++dec_cur; *cur++ = '\011'; break;
627	case 'n': ++dec->cur; *cur++ = '\012'; break;	818	case 'n': ++dec_cur; *cur++ = '\012'; break;
628	case 'f': ++dec->cur; *cur++ = '\014'; break;	819	case 'f': ++dec_cur; *cur++ = '\014'; break;
629	case 'r': ++dec->cur; *cur++ = '\015'; break;	820	case 'r': ++dec_cur; *cur++ = '\015'; break;
630		821
631	case 'u':	822	case 'u':
632	{	823	{
633	UV lo, hi;	824	UV lo, hi;
634	++dec->cur;	825	++dec_cur;
635		826
		827	dec->cur = dec_cur;
636	hi = decode_4hex (dec);	828	hi = decode_4hex (dec);
		829	dec_cur = dec->cur;
637	if (hi == (UV)-1)	830	if (hi == (UV)-1)
638	goto fail;	831	goto fail;
639		832
640	// possibly a surrogate pair	833	// possibly a surrogate pair
641	if (hi >= 0xd800)	834	if (hi >= 0xd800)
642	if (hi < 0xdc00)	835	if (hi < 0xdc00)
643	{	836	{
644	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	837	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
645	ERR ("missing low surrogate character in surrogate pair");	838	ERR ("missing low surrogate character in surrogate pair");
646		839
647	dec->cur += 2;	840	dec_cur += 2;
648		841
		842	dec->cur = dec_cur;
649	lo = decode_4hex (dec);	843	lo = decode_4hex (dec);
		844	dec_cur = dec->cur;
650	if (lo == (UV)-1)	845	if (lo == (UV)-1)
651	goto fail;	846	goto fail;
652		847
653	if (lo < 0xdc00 || lo >= 0xe000)	848	if (lo < 0xdc00 || lo >= 0xe000)
654	ERR ("surrogate pair expected");	849	ERR ("surrogate pair expected");
…		…
668	*cur++ = hi;	863	*cur++ = hi;
669	}	864	}
670	break;	865	break;
671		866
672	default:	867	default:
673	--dec->cur;	868	--dec_cur;
674	ERR ("illegal backslash escape sequence in string");	869	ERR ("illegal backslash escape sequence in string");
675	}	870	}
676	}	871	}
677	else if (ch >= 0x20 && ch <= 0x7f)	872	else if (expect_true (ch >= 0x20 && ch <= 0x7f))
678	*cur++ = ch;	873	*cur++ = ch;
679	else if (ch >= 0x80)	874	else if (ch >= 0x80)
680	{	875	{
681	STRLEN clen;	876	STRLEN clen;
682	UV uch;	877	UV uch;
683		878
684	--dec->cur;	879	--dec_cur;
685		880
686	uch = decode_utf8 (dec->cur, dec->end - dec->cur, &clen);	881	uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
687	if (clen == (STRLEN)-1)	882	if (clen == (STRLEN)-1)
688	ERR ("malformed UTF-8 character in JSON string");	883	ERR ("malformed UTF-8 character in JSON string");
689		884
690	do	885	do
691	*cur++ = *dec->cur++;	886	*cur++ = *dec_cur++;
692	while (--clen);	887	while (--clen);
693		888
694	utf8 = 1;	889	utf8 = 1;
695	}	890	}
696	else	891	else
697	{	892	{
698	--dec->cur;	893	--dec_cur;
699		894
700	if (!ch)	895	if (!ch)
701	ERR ("unexpected end of string while parsing JSON string");	896	ERR ("unexpected end of string while parsing JSON string");
702	else	897	else
703	ERR ("invalid character encountered while parsing JSON string");	898	ERR ("invalid character encountered while parsing JSON string");
…		…
716	}	911	}
717	else	912	else
718	sv = newSVpvn (buf, len);	913	sv = newSVpvn (buf, len);
719	}	914	}
720	}	915	}
721	while (*dec->cur != '"');	916	while (*dec_cur != '"');
722		917
723	++dec->cur;	918	++dec_cur;
724		919
725	if (sv)	920	if (sv)
726	{	921	{
727	SvPOK_only (sv);	922	SvPOK_only (sv);
728	*SvEND (sv) = 0;	923	*SvEND (sv) = 0;
…		…
731	SvUTF8_on (sv);	926	SvUTF8_on (sv);
732	}	927	}
733	else	928	else
734	sv = newSVpvn ("", 0);	929	sv = newSVpvn ("", 0);
735		930
		931	dec->cur = dec_cur;
736	return sv;	932	return sv;
737		933
738	fail:	934	fail:
		935	dec->cur = dec_cur;
739	return 0;	936	return 0;
740	}	937	}
741		938
742	static SV *	939	static SV *
743	decode_num (dec_t *dec)	940	decode_num (dec_t *dec)
…		…
801	is_nv = 1;	998	is_nv = 1;
802	}	999	}
803		1000
804	if (!is_nv)	1001	if (!is_nv)
805	{	1002	{
806	UV uv;	1003	int len = dec->cur - start;
807	int numtype = grok_number (start, dec->cur - start, &uv);	1004
808	if (numtype & IS_NUMBER_IN_UV)	1005	// special case the rather common 1..5-digit-int case
809	if (numtype & IS_NUMBER_NEG)	1006	if (*start == '-')
		1007	switch (len)
810	{	1008	{
811	if (uv < (UV)IV_MIN)	1009	case 2: return newSViv (-( start [1] - '0' * 1));
812	return newSViv (-(IV)uv);	1010	case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
		1011	case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
		1012	case 5: return newSViv (-( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
		1013	case 6: return newSViv (-(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
813	}	1014	}
		1015	else
		1016	switch (len)
		1017	{
		1018	case 1: return newSViv ( start [0] - '0' * 1);
		1019	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1020	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1021	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1022	case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
		1023	}
		1024
		1025	{
		1026	UV uv;
		1027	int numtype = grok_number (start, len, &uv);
		1028	if (numtype & IS_NUMBER_IN_UV)
		1029	if (numtype & IS_NUMBER_NEG)
		1030	{
		1031	if (uv < (UV)IV_MIN)
		1032	return newSViv (-(IV)uv);
		1033	}
814	else	1034	else
815	return newSVuv (uv);	1035	return newSVuv (uv);
816	}	1036	}
817		1037
		1038	len -= *start == '-' ? 1 : 0;
		1039
		1040	// does not fit into IV or UV, try NV
		1041	if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len)
		1042	#if defined (LDBL_DIG)
		1043	|| (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len)
		1044	#endif
		1045	)
		1046	// fits into NV without loss of precision
		1047	return newSVnv (Atof (start));
		1048
		1049	// everything else fails, convert it to a string
		1050	return newSVpvn (start, dec->cur - start);
		1051	}
		1052
		1053	// loss of precision here
818	return newSVnv (Atof (start));	1054	return newSVnv (Atof (start));
819		1055
820	fail:	1056	fail:
821	return 0;	1057	return 0;
822	}	1058	}
…		…
852		1088
853	if (*dec->cur != ',')	1089	if (*dec->cur != ',')
854	ERR (", or ] expected while parsing array");	1090	ERR (", or ] expected while parsing array");
855		1091
856	++dec->cur;	1092	++dec->cur;
		1093
		1094	decode_ws (dec);
		1095
		1096	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1097	{
		1098	++dec->cur;
		1099	break;
		1100	}
857	}	1101	}
858		1102
859	DEC_DEC_DEPTH;	1103	DEC_DEC_DEPTH;
860	return newRV_noinc ((SV *)av);	1104	return newRV_noinc ((SV *)av);
861		1105
…		…
866	}	1110	}
867		1111
868	static SV *	1112	static SV *
869	decode_hv (dec_t *dec)	1113	decode_hv (dec_t *dec)
870	{	1114	{
		1115	SV *sv;
871	HV *hv = newHV ();	1116	HV *hv = newHV ();
872		1117
873	DEC_INC_DEPTH;	1118	DEC_INC_DEPTH;
874	decode_ws (dec);	1119	decode_ws (dec);
875		1120
876	if (*dec->cur == '}')	1121	if (*dec->cur == '}')
877	++dec->cur;	1122	++dec->cur;
878	else	1123	else
879	for (;;)	1124	for (;;)
880	{	1125	{
		1126	EXPECT_CH ('"');
		1127
		1128	// heuristic: assume that
		1129	// a) decode_str + hv_store_ent are abysmally slow.
		1130	// b) most hash keys are short, simple ascii text.
		1131	// => try to "fast-match" such strings to avoid
		1132	// the overhead of decode_str + hv_store_ent.
		1133	{
881	SV *key, *value;	1134	SV *value;
		1135	char *p = dec->cur;
		1136	char *e = p + 24; // only try up to 24 bytes
882		1137
883	decode_ws (dec); EXPECT_CH ('"');	1138	for (;;)
884
885	key = decode_str (dec);
886	if (!key)
887	goto fail;
888
889	decode_ws (dec); EXPECT_CH (':');
890
891	value = decode_sv (dec);
892	if (!value)
893	{	1139	{
		1140	// the >= 0x80 is true on most architectures
		1141	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1142	{
		1143	// slow path, back up and use decode_str
		1144	SV *key = decode_str (dec);
		1145	if (!key)
		1146	goto fail;
		1147
		1148	decode_ws (dec); EXPECT_CH (':');
		1149
		1150	decode_ws (dec);
		1151	value = decode_sv (dec);
		1152	if (!value)
		1153	{
		1154	SvREFCNT_dec (key);
		1155	goto fail;
		1156	}
		1157
		1158	hv_store_ent (hv, key, value, 0);
894	SvREFCNT_dec (key);	1159	SvREFCNT_dec (key);
		1160
		1161	break;
		1162	}
		1163	else if (*p == '"')
		1164	{
		1165	// fast path, got a simple key
		1166	char *key = dec->cur;
		1167	int len = p - key;
		1168	dec->cur = p + 1;
		1169
		1170	decode_ws (dec); EXPECT_CH (':');
		1171
		1172	decode_ws (dec);
		1173	value = decode_sv (dec);
		1174	if (!value)
895	goto fail;	1175	goto fail;
		1176
		1177	hv_store (hv, key, len, value, 0);
		1178
		1179	break;
		1180	}
		1181
		1182	++p;
896	}	1183	}
897		1184	}
898	hv_store_ent (hv, key, value, 0);
899	SvREFCNT_dec (key);
900		1185
901	decode_ws (dec);	1186	decode_ws (dec);
902		1187
903	if (*dec->cur == '}')	1188	if (*dec->cur == '}')
904	{	1189	{
…		…
908		1193
909	if (*dec->cur != ',')	1194	if (*dec->cur != ',')
910	ERR (", or } expected while parsing object/hash");	1195	ERR (", or } expected while parsing object/hash");
911		1196
912	++dec->cur;	1197	++dec->cur;
		1198
		1199	decode_ws (dec);
		1200
		1201	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1202	{
		1203	++dec->cur;
		1204	break;
		1205	}
913	}	1206	}
914		1207
915	DEC_DEC_DEPTH;	1208	DEC_DEC_DEPTH;
916	return newRV_noinc ((SV *)hv);	1209	sv = newRV_noinc ((SV *)hv);
		1210
		1211	// check filter callbacks
		1212	if (dec->json.flags & F_HOOK)
		1213	{
		1214	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1215	{
		1216	HE *cb, *he;
		1217
		1218	hv_iterinit (hv);
		1219	he = hv_iternext (hv);
		1220	hv_iterinit (hv);
		1221
		1222	// the next line creates a mortal sv each time its called.
		1223	// might want to optimise this for common cases.
		1224	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1225
		1226	if (cb)
		1227	{
		1228	dSP;
		1229	int count;
		1230
		1231	ENTER; SAVETMPS; PUSHMARK (SP);
		1232	XPUSHs (HeVAL (he));
		1233
		1234	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1235
		1236	if (count == 1)
		1237	{
		1238	sv = newSVsv (POPs);
		1239	FREETMPS; LEAVE;
		1240	return sv;
		1241	}
		1242
		1243	FREETMPS; LEAVE;
		1244	}
		1245	}
		1246
		1247	if (dec->json.cb_object)
		1248	{
		1249	dSP;
		1250	int count;
		1251
		1252	ENTER; SAVETMPS; PUSHMARK (SP);
		1253	XPUSHs (sv_2mortal (sv));
		1254
		1255	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1256
		1257	if (count == 1)
		1258	{
		1259	sv = newSVsv (POPs);
		1260	FREETMPS; LEAVE;
		1261	return sv;
		1262	}
		1263
		1264	SvREFCNT_inc (sv);
		1265	FREETMPS; LEAVE;
		1266	}
		1267	}
		1268
		1269	return sv;
917		1270
918	fail:	1271	fail:
919	SvREFCNT_dec (hv);	1272	SvREFCNT_dec (hv);
920	DEC_DEC_DEPTH;	1273	DEC_DEC_DEPTH;
921	return 0;	1274	return 0;
922	}	1275	}
923		1276
924	static SV *	1277	static SV *
925	decode_sv (dec_t *dec)	1278	decode_sv (dec_t *dec)
926	{	1279	{
927	decode_ws (dec);	1280	// the beauty of JSON: you need exactly one character lookahead
		1281	// to parse anything.
928	switch (*dec->cur)	1282	switch (*dec->cur)
929	{	1283	{
930	case '"': ++dec->cur; return decode_str (dec);	1284	case '"': ++dec->cur; return decode_str (dec);
931	case '[': ++dec->cur; return decode_av (dec);	1285	case '[': ++dec->cur; return decode_av (dec);
932	case '{': ++dec->cur; return decode_hv (dec);	1286	case '{': ++dec->cur; return decode_hv (dec);
…		…
938		1292
939	case 't':	1293	case 't':
940	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1294	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
941	{	1295	{
942	dec->cur += 4;	1296	dec->cur += 4;
943	return newSViv (1);	1297	#if JSON_SLOW
		1298	json_true = get_sv ("JSON::XS::true", 1); SvREADONLY_on (json_true);
		1299	#endif
		1300	return SvREFCNT_inc (json_true);
944	}	1301	}
945	else	1302	else
946	ERR ("'true' expected");	1303	ERR ("'true' expected");
947		1304
948	break;	1305	break;
949		1306
950	case 'f':	1307	case 'f':
951	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1308	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
952	{	1309	{
953	dec->cur += 5;	1310	dec->cur += 5;
954	return newSViv (0);	1311	#if JSON_SLOW
		1312	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1313	#endif
		1314	return SvREFCNT_inc (json_false);
955	}	1315	}
956	else	1316	else
957	ERR ("'false' expected");	1317	ERR ("'false' expected");
958		1318
959	break;	1319	break;
…		…
977	fail:	1337	fail:
978	return 0;	1338	return 0;
979	}	1339	}
980		1340
981	static SV *	1341	static SV *
982	decode_json (SV *string, U32 flags)	1342	decode_json (SV *string, JSON *json, UV *offset_return)
983	{	1343	{
984	dec_t dec;	1344	dec_t dec;
		1345	UV offset;
985	SV *sv;	1346	SV *sv;
986		1347
987	SvGETMAGIC (string);	1348	SvGETMAGIC (string);
988	SvUPGRADE (string, SVt_PV);	1349	SvUPGRADE (string, SVt_PV);
989		1350
		1351	if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
		1352	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1353	(unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
		1354
990	if (flags & F_UTF8)	1355	if (json->flags & F_UTF8)
991	sv_utf8_downgrade (string, 0);	1356	sv_utf8_downgrade (string, 0);
992	else	1357	else
993	sv_utf8_upgrade (string);	1358	sv_utf8_upgrade (string);
994		1359
995	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1360	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
996		1361
997	dec.flags = flags;	1362	dec.json = *json;
998	dec.cur = SvPVX (string);	1363	dec.cur = SvPVX (string);
999	dec.end = SvEND (string);	1364	dec.end = SvEND (string);
1000	dec.err = 0;	1365	dec.err = 0;
1001	dec.depth = 0;	1366	dec.depth = 0;
1002	dec.maxdepth = DEC_DEPTH (dec.flags);	1367	dec.maxdepth = DEC_DEPTH (dec.json.flags);
1003		1368
		1369	if (dec.json.cb_object || dec.json.cb_sk_object)
		1370	dec.json.flags |= F_HOOK;
		1371
1004	*dec.end = 0; // this should basically be a nop, too, but make sure its there	1372	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1373
		1374	decode_ws (&dec);
1005	sv = decode_sv (&dec);	1375	sv = decode_sv (&dec);
1006		1376
		1377	if (!(offset_return || !sv))
		1378	{
		1379	// check for trailing garbage
		1380	decode_ws (&dec);
		1381
		1382	if (*dec.cur)
		1383	{
		1384	dec.err = "garbage after JSON object";
		1385	SvREFCNT_dec (sv);
		1386	sv = 0;
		1387	}
		1388	}
		1389
		1390	if (offset_return || !sv)
		1391	{
		1392	offset = dec.json.flags & F_UTF8
		1393	? dec.cur - SvPVX (string)
		1394	: utf8_distance (dec.cur, SvPVX (string));
		1395
		1396	if (offset_return)
		1397	*offset_return = offset;
		1398	}
		1399
1007	if (!sv)	1400	if (!sv)
1008	{	1401	{
1009	IV offset = dec.flags & F_UTF8
1010	? dec.cur - SvPVX (string)
1011	: utf8_distance (dec.cur, SvPVX (string));
1012	SV *uni = sv_newmortal ();	1402	SV *uni = sv_newmortal ();
1013		1403
1014	// horrible hack to silence warning inside pv_uni_display	1404	// horrible hack to silence warning inside pv_uni_display
1015	COP cop = *PL_curcop;	1405	COP cop = *PL_curcop;
1016	cop.cop_warnings = pWARN_NONE;	1406	cop.cop_warnings = pWARN_NONE;
…		…
1026	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1416	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
1027	}	1417	}
1028		1418
1029	sv = sv_2mortal (sv);	1419	sv = sv_2mortal (sv);
1030		1420
1031	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1421	if (!(dec.json.flags & F_ALLOW_NONREF) && !SvROK (sv))
1032	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");	1422	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
1033		1423
1034	return sv;	1424	return sv;
1035	}	1425	}
1036		1426
…		…
1040	MODULE = JSON::XS PACKAGE = JSON::XS	1430	MODULE = JSON::XS PACKAGE = JSON::XS
1041		1431
1042	BOOT:	1432	BOOT:
1043	{	1433	{
1044	int i;	1434	int i;
1045
1046	memset (decode_hexdigit, 0xff, 256);
1047		1435
1048	for (i = 0; i < 256; ++i)	1436	for (i = 0; i < 256; ++i)
1049	decode_hexdigit [i] =	1437	decode_hexdigit [i] =
1050	i >= '0' && i <= '9' ? i - '0'	1438	i >= '0' && i <= '9' ? i - '0'
1051	: i >= 'a' && i <= 'f' ? i - 'a' + 10	1439	: i >= 'a' && i <= 'f' ? i - 'a' + 10
1052	: i >= 'A' && i <= 'F' ? i - 'A' + 10	1440	: i >= 'A' && i <= 'F' ? i - 'A' + 10
1053	: -1;	1441	: -1;
1054		1442
1055	json_stash = gv_stashpv ("JSON::XS", 1);	1443	json_stash = gv_stashpv ("JSON::XS" , 1);
		1444	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1445
		1446	json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
		1447	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
1056	}	1448	}
1057		1449
1058	PROTOTYPES: DISABLE	1450	PROTOTYPES: DISABLE
1059		1451
1060	SV *new (char *dummy)	1452	void CLONE (...)
1061	CODE:	1453	CODE:
1062	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1454	json_stash = 0;
		1455	json_boolean_stash = 0;
		1456
		1457	void new (char *klass)
		1458	PPCODE:
		1459	{
		1460	SV *pv = NEWSV (0, sizeof (JSON));
		1461	SvPOK_only (pv);
		1462	Zero (SvPVX (pv), 1, JSON);
		1463	((JSON *)SvPVX (pv))->flags = F_DEFAULT;
		1464	XPUSHs (sv_2mortal (sv_bless (
		1465	newRV_noinc (pv),
		1466	strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
		1467	)));
		1468	}
		1469
		1470	void ascii (JSON *self, int enable = 1)
		1471	ALIAS:
		1472	ascii = F_ASCII
		1473	latin1 = F_LATIN1
		1474	utf8 = F_UTF8
		1475	indent = F_INDENT
		1476	canonical = F_CANONICAL
		1477	space_before = F_SPACE_BEFORE
		1478	space_after = F_SPACE_AFTER
		1479	pretty = F_PRETTY
		1480	allow_nonref = F_ALLOW_NONREF
		1481	shrink = F_SHRINK
		1482	allow_blessed = F_ALLOW_BLESSED
		1483	convert_blessed = F_CONV_BLESSED
		1484	relaxed = F_RELAXED
		1485	PPCODE:
		1486	{
		1487	if (enable)
		1488	self->flags |= ix;
		1489	else
		1490	self->flags &= ~ix;
		1491
		1492	XPUSHs (ST (0));
		1493	}
		1494
		1495	void get_ascii (JSON *self)
		1496	ALIAS:
		1497	get_ascii = F_ASCII
		1498	get_latin1 = F_LATIN1
		1499	get_utf8 = F_UTF8
		1500	get_indent = F_INDENT
		1501	get_canonical = F_CANONICAL
		1502	get_space_before = F_SPACE_BEFORE
		1503	get_space_after = F_SPACE_AFTER
		1504	get_allow_nonref = F_ALLOW_NONREF
		1505	get_shrink = F_SHRINK
		1506	get_allow_blessed = F_ALLOW_BLESSED
		1507	get_convert_blessed = F_CONV_BLESSED
		1508	get_relaxed = F_RELAXED
		1509	PPCODE:
		1510	XPUSHs (boolSV (self->flags & ix));
		1511
		1512	void max_depth (JSON *self, UV max_depth = 0x80000000UL)
		1513	PPCODE:
		1514	{
		1515	UV log2 = 0;
		1516
		1517	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
		1518
		1519	while ((1UL << log2) < max_depth)
		1520	++log2;
		1521
		1522	self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
		1523
		1524	XPUSHs (ST (0));
		1525	}
		1526
		1527	U32 get_max_depth (JSON *self)
		1528	CODE:
		1529	RETVAL = DEC_DEPTH (self->flags);
1063	OUTPUT:	1530	OUTPUT:
1064	RETVAL	1531	RETVAL
1065		1532
1066	SV *ascii (SV *self, int enable = 1)	1533	void max_size (JSON *self, UV max_size = 0)
1067	ALIAS:	1534	PPCODE:
1068	ascii = F_ASCII	1535	{
1069	utf8 = F_UTF8	1536	UV log2 = 0;
1070	indent = F_INDENT	1537
1071	canonical = F_CANONICAL	1538	if (max_size > 0x80000000UL) max_size = 0x80000000UL;
1072	space_before = F_SPACE_BEFORE	1539	if (max_size == 1) max_size = 2;
1073	space_after = F_SPACE_AFTER	1540
1074	pretty = F_PRETTY	1541	while ((1UL << log2) < max_size)
1075	allow_nonref = F_ALLOW_NONREF	1542	++log2;
1076	shrink = F_SHRINK	1543
		1544	self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
		1545
		1546	XPUSHs (ST (0));
		1547	}
		1548
		1549	int get_max_size (JSON *self)
1077	CODE:	1550	CODE:
1078	{	1551	RETVAL = DEC_SIZE (self->flags);
1079	UV *uv = SvJSON (self);
1080	if (enable)
1081	*uv |= ix;
1082	else
1083	*uv &= ~ix;
1084
1085	RETVAL = newSVsv (self);
1086	}
1087	OUTPUT:	1552	OUTPUT:
1088	RETVAL	1553	RETVAL
1089		1554
1090	SV *max_depth (SV *self, UV max_depth = 0x80000000UL)	1555	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
		1556	PPCODE:
		1557	{
		1558	SvREFCNT_dec (self->cb_object);
		1559	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
		1560
		1561	XPUSHs (ST (0));
		1562	}
		1563
		1564	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
		1565	PPCODE:
		1566	{
		1567	if (!self->cb_sk_object)
		1568	self->cb_sk_object = newHV ();
		1569
		1570	if (SvOK (cb))
		1571	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1572	else
		1573	{
		1574	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
		1575
		1576	if (!HvKEYS (self->cb_sk_object))
		1577	{
		1578	SvREFCNT_dec (self->cb_sk_object);
		1579	self->cb_sk_object = 0;
		1580	}
		1581	}
		1582
		1583	XPUSHs (ST (0));
		1584	}
		1585
		1586	void encode (JSON *self, SV *scalar)
		1587	PPCODE:
		1588	XPUSHs (encode_json (scalar, self));
		1589
		1590	void decode (JSON *self, SV *jsonstr)
		1591	PPCODE:
		1592	XPUSHs (decode_json (jsonstr, self, 0));
		1593
		1594	void decode_prefix (JSON *self, SV *jsonstr)
		1595	PPCODE:
		1596	{
		1597	UV offset;
		1598	EXTEND (SP, 2);
		1599	PUSHs (decode_json (jsonstr, self, &offset));
		1600	PUSHs (sv_2mortal (newSVuv (offset)));
		1601	}
		1602
		1603	void DESTROY (JSON *self)
1091	CODE:	1604	CODE:
1092	{	1605	SvREFCNT_dec (self->cb_sk_object);
1093	UV *uv = SvJSON (self);	1606	SvREFCNT_dec (self->cb_object);
1094	UV log2 = 0;
1095		1607
1096	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;	1608	PROTOTYPES: ENABLE
1097		1609
1098	while ((1UL << log2) < max_depth)
1099	++log2;
1100
1101	*uv = *uv & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
1102
1103	RETVAL = newSVsv (self);
1104	}
1105	OUTPUT:
1106	RETVAL
1107
1108	void encode (SV *self, SV *scalar)	1610	void encode_json (SV *scalar)
1109	PPCODE:	1611	PPCODE:
		1612	{
		1613	JSON json = { F_DEFAULT | F_UTF8 };
1110	XPUSHs (encode_json (scalar, *SvJSON (self)));	1614	XPUSHs (encode_json (scalar, &json));
		1615	}
1111		1616
1112	void decode (SV *self, SV *jsonstr)	1617	void decode_json (SV *jsonstr)
1113	PPCODE:	1618	PPCODE:
		1619	{
		1620	JSON json = { F_DEFAULT | F_UTF8 };
1114	XPUSHs (decode_json (jsonstr, *SvJSON (self)));	1621	XPUSHs (decode_json (jsonstr, &json, 0));
		1622	}
1115		1623
1116	PROTOTYPES: ENABLE
1117
1118	void to_json (SV *scalar)
1119	ALIAS:
1120	objToJson = 0
1121	PPCODE:
1122	XPUSHs (encode_json (scalar, F_DEFAULT | F_UTF8));
1123
1124	void from_json (SV *jsonstr)
1125	ALIAS:
1126	jsonToObj = 0
1127	PPCODE:
1128	XPUSHs (decode_json (jsonstr, F_DEFAULT | F_UTF8));
1129

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