ViewVC Help

View File | Revision Log | Show Annotations | Download File

/cvs/JSON-XS/XS.xs

Comparing JSON-XS/XS.xs (file contents):
Revision 1.15 by root, Sun Mar 25 02:32:40 2007 UTC vs.
Revision 1.68 by root, Thu Nov 29 08:37:11 2007 UTC

1	#include "EXTERN.h"	1	#include "EXTERN.h"
2	#include "perl.h"	2	#include "perl.h"
3	#include "XSUB.h"	3	#include "XSUB.h"
4		4
5	#include "assert.h"	5	#include <assert.h>
6	#include "string.h"	6	#include <string.h>
7	#include "stdlib.h"	7	#include <stdlib.h>
		8	#include <stdio.h>
		9	#include <float.h>
8		10
		11	#if defined(__BORLANDC__) || defined(_MSC_VER)
		12	# define snprintf _snprintf // C compilers have this in stdio.h
		13	#endif
		14
		15	// some old perls do not have this, try to make it work, no
		16	// guarentees, though. if it breaks, you get to keep the pieces.
		17	#ifndef UTF8_MAXBYTES
		18	# define UTF8_MAXBYTES 13
		19	#endif
		20
9	#define F_ASCII 0x00000001	21	#define F_ASCII 0x00000001UL
		22	#define F_LATIN1 0x00000002UL
10	#define F_UTF8 0x00000002	23	#define F_UTF8 0x00000004UL
11	#define F_INDENT 0x00000004	24	#define F_INDENT 0x00000008UL
12	#define F_CANONICAL 0x00000008	25	#define F_CANONICAL 0x00000010UL
13	#define F_SPACE_BEFORE 0x00000010	26	#define F_SPACE_BEFORE 0x00000020UL
14	#define F_SPACE_AFTER 0x00000020	27	#define F_SPACE_AFTER 0x00000040UL
15	#define F_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 512 // 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 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
89	} enc_t;	133	} enc_t;
90		134
91	static void	135	inline void
92	need (enc_t *enc, STRLEN len)	136	need (enc_t *enc, STRLEN len)
93	{	137	{
94	if (enc->cur + len >= enc->end)	138	if (expect_false (enc->cur + len >= enc->end))
95	{	139	{
96	STRLEN cur = enc->cur - SvPVX (enc->sv);	140	STRLEN cur = enc->cur - SvPVX (enc->sv);
97	SvGROW (enc->sv, cur + len + 1);	141	SvGROW (enc->sv, cur + len + 1);
98	enc->cur = SvPVX (enc->sv) + cur;	142	enc->cur = SvPVX (enc->sv) + cur;
99	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv);	143	enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
100	}	144	}
101	}	145	}
102		146
103	static void	147	inline void
104	encode_ch (enc_t *enc, char ch)	148	encode_ch (enc_t *enc, char ch)
105	{	149	{
106	need (enc, 1);	150	need (enc, 1);
107	*enc->cur++ = ch;	151	*enc->cur++ = ch;
108	}	152	}
…		…
116		160
117	while (str < end)	161	while (str < end)
118	{	162	{
119	unsigned char ch = *(unsigned char *)str;	163	unsigned char ch = *(unsigned char *)str;
120		164
121	if (ch >= 0x20 && ch < 0x80) // most common case	165	if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
122	{	166	{
123	if (ch == '"') // but with slow exceptions	167	if (expect_false (ch == '"')) // but with slow exceptions
124	{	168	{
125	need (enc, len += 1);	169	need (enc, len += 1);
126	*enc->cur++ = '\\';	170	*enc->cur++ = '\\';
127	*enc->cur++ = '"';	171	*enc->cur++ = '"';
128	}	172	}
129	else if (ch == '\\')	173	else if (expect_false (ch == '\\'))
130	{	174	{
131	need (enc, len += 1);	175	need (enc, len += 1);
132	*enc->cur++ = '\\';	176	*enc->cur++ = '\\';
133	*enc->cur++ = '\\';	177	*enc->cur++ = '\\';
134	}	178	}
…		…
152	STRLEN clen;	196	STRLEN clen;
153	UV uch;	197	UV uch;
154		198
155	if (is_utf8)	199	if (is_utf8)
156	{	200	{
157	//uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);
158	uch = decode_utf8 (str, end - str, &clen);	201	uch = decode_utf8 (str, end - str, &clen);
159	if (clen == (STRLEN)-1)	202	if (clen == (STRLEN)-1)
160	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);
161	}	204	}
162	else	205	else
…		…
166	}	209	}
167		210
168	if (uch > 0x10FFFFUL)	211	if (uch > 0x10FFFFUL)
169	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);
170		213
171	if (uch < 0x80 || enc->flags & F_ASCII)	214	if (uch < 0x80 || enc->json.flags & F_ASCII || (enc->json.flags & F_LATIN1 && uch > 0xFF))
172	{	215	{
173	if (uch > 0xFFFFUL)	216	if (uch > 0xFFFFUL)
174	{	217	{
175	need (enc, len += 11);	218	need (enc, len += 11);
176	sprintf (enc->cur, "\\u%04x\\u%04x",	219	sprintf (enc->cur, "\\u%04x\\u%04x",
…		…
190	*enc->cur++ = hexdigit [(uch >> 0) & 15];	233	*enc->cur++ = hexdigit [(uch >> 0) & 15];
191	}	234	}
192		235
193	str += clen;	236	str += clen;
194	}	237	}
		238	else if (enc->json.flags & F_LATIN1)
		239	{
		240	*enc->cur++ = uch;
		241	str += clen;
		242	}
195	else if (is_utf8)	243	else if (is_utf8)
196	{	244	{
197	need (enc, len += clen);	245	need (enc, len += clen);
198	do	246	do
199	{	247	{
…		…
201	}	249	}
202	while (--clen);	250	while (--clen);
203	}	251	}
204	else	252	else
205	{	253	{
206	need (enc, len += UTF8_MAX_LEN - 1); // never more than 11 bytes needed	254	need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
207	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);	255	enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
208	++str;	256	++str;
209	}	257	}
210	}	258	}
211	}	259	}
…		…
213		261
214	--len;	262	--len;
215	}	263	}
216	}	264	}
217		265
218	static void	266	inline void
219	encode_indent (enc_t *enc)	267	encode_indent (enc_t *enc)
220	{	268	{
221	if (enc->flags & F_INDENT)	269	if (enc->json.flags & F_INDENT)
222	{	270	{
223	int spaces = enc->indent * INDENT_STEP;	271	int spaces = enc->indent * INDENT_STEP;
224		272
225	need (enc, spaces);	273	need (enc, spaces);
226	memset (enc->cur, ' ', spaces);	274	memset (enc->cur, ' ', spaces);
227	enc->cur += spaces;	275	enc->cur += spaces;
228	}	276	}
229	}	277	}
230		278
231	static void	279	inline void
232	encode_space (enc_t *enc)	280	encode_space (enc_t *enc)
233	{	281	{
234	need (enc, 1);	282	need (enc, 1);
235	encode_ch (enc, ' ');	283	encode_ch (enc, ' ');
236	}	284	}
237		285
238	static void	286	inline void
239	encode_nl (enc_t *enc)	287	encode_nl (enc_t *enc)
240	{	288	{
241	if (enc->flags & F_INDENT)	289	if (enc->json.flags & F_INDENT)
242	{	290	{
243	need (enc, 1);	291	need (enc, 1);
244	encode_ch (enc, '\n');	292	encode_ch (enc, '\n');
245	}	293	}
246	}	294	}
247		295
248	static void	296	inline void
249	encode_comma (enc_t *enc)	297	encode_comma (enc_t *enc)
250	{	298	{
251	encode_ch (enc, ',');	299	encode_ch (enc, ',');
252		300
253	if (enc->flags & F_INDENT)	301	if (enc->json.flags & F_INDENT)
254	encode_nl (enc);	302	encode_nl (enc);
255	else if (enc->flags & F_SPACE_AFTER)	303	else if (enc->json.flags & F_SPACE_AFTER)
256	encode_space (enc);	304	encode_space (enc);
257	}	305	}
258		306
259	static void encode_sv (enc_t *enc, SV *sv);	307	static void encode_sv (enc_t *enc, SV *sv);
260		308
261	static void	309	static void
262	encode_av (enc_t *enc, AV *av)	310	encode_av (enc_t *enc, AV *av)
263	{	311	{
264	int i, len = av_len (av);	312	int i, len = av_len (av);
265		313
266	encode_ch (enc, '['); encode_nl (enc);	314	if (enc->indent >= enc->maxdepth)
267	++enc->indent;	315	croak ("data structure too deep (hit recursion limit)");
268		316
		317	encode_ch (enc, '[');
		318
		319	if (len >= 0)
		320	{
		321	encode_nl (enc); ++enc->indent;
		322
269	for (i = 0; i <= len; ++i)	323	for (i = 0; i <= len; ++i)
270	{	324	{
		325	SV **svp = av_fetch (av, i, 0);
		326
271	encode_indent (enc);	327	encode_indent (enc);
272	encode_sv (enc, *av_fetch (av, i, 0));
273		328
		329	if (svp)
		330	encode_sv (enc, *svp);
		331	else
		332	encode_str (enc, "null", 4, 0);
		333
274	if (i < len)	334	if (i < len)
275	encode_comma (enc);	335	encode_comma (enc);
276	}	336	}
277		337
		338	encode_nl (enc); --enc->indent; encode_indent (enc);
		339	}
		340
278	encode_nl (enc);	341	encode_ch (enc, ']');
279
280	--enc->indent;
281	encode_indent (enc); encode_ch (enc, ']');
282	}	342	}
283		343
284	static void	344	static void
285	encode_he (enc_t *enc, HE *he)	345	encode_hk (enc_t *enc, HE *he)
286	{	346	{
287	encode_ch (enc, '"');	347	encode_ch (enc, '"');
288		348
289	if (HeKLEN (he) == HEf_SVKEY)	349	if (HeKLEN (he) == HEf_SVKEY)
290	{	350	{
…		…
300	else	360	else
301	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));	361	encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
302		362
303	encode_ch (enc, '"');	363	encode_ch (enc, '"');
304		364
305	if (enc->flags & F_SPACE_BEFORE) encode_space (enc);	365	if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
306	encode_ch (enc, ':');	366	encode_ch (enc, ':');
307	if (enc->flags & F_SPACE_AFTER ) encode_space (enc);	367	if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
308	encode_sv (enc, HeVAL (he));
309	}	368	}
310		369
311	// compare hash entries, used when all keys are bytestrings	370	// compare hash entries, used when all keys are bytestrings
312	static int	371	static int
313	he_cmp_fast (const void *a_, const void *b_)	372	he_cmp_fast (const void *a_, const void *b_)
…		…
318	HE *b = *(HE **)b_;	377	HE *b = *(HE **)b_;
319		378
320	STRLEN la = HeKLEN (a);	379	STRLEN la = HeKLEN (a);
321	STRLEN lb = HeKLEN (b);	380	STRLEN lb = HeKLEN (b);
322		381
323	if (!(cmp = memcmp (HeKEY (a), HeKEY (b), la < lb ? la : lb)))	382	if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
324	cmp = la - lb;	383	cmp = lb - la;
325		384
326	return cmp;	385	return cmp;
327	}	386	}
328		387
329	// 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
330	static int	389	static int
331	he_cmp_slow (const void *a, const void *b)	390	he_cmp_slow (const void *a, const void *b)
332	{	391	{
333	return sv_cmp (HeSVKEY_force (*(HE **)a), HeSVKEY_force (*(HE **)b));	392	return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
334	}	393	}
335		394
336	static void	395	static void
337	encode_hv (enc_t *enc, HV *hv)	396	encode_hv (enc_t *enc, HV *hv)
338	{	397	{
		398	HE *he;
339	int count, i;	399	int count;
340		400
341	encode_ch (enc, '{'); encode_nl (enc); ++enc->indent;	401	if (enc->indent >= enc->maxdepth)
		402	croak ("data structure too deep (hit recursion limit)");
342		403
343	if ((count = hv_iterinit (hv)))	404	encode_ch (enc, '{');
344	{	405
345	// for canonical output we have to sort by keys first	406	// for canonical output we have to sort by keys first
346	// actually, this is mostly due to the stupid so-called	407	// actually, this is mostly due to the stupid so-called
347	// security workaround added somewhere in 5.8.x.	408	// security workaround added somewhere in 5.8.x.
348	// that randomises hash orderings	409	// that randomises hash orderings
349	if (enc->flags & F_CANONICAL)	410	if (enc->json.flags & F_CANONICAL)
		411	{
		412	int count = hv_iterinit (hv);
		413
		414	if (SvMAGICAL (hv))
350	{	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
351	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
352	int fast = 1;	435	#endif
353		436
354	i = 0;	437	i = 0;
355	while ((he = hv_iternext (hv)))	438	while ((he = hv_iternext (hv)))
356	{	439	{
357	hes [i++] = he;	440	hes [i++] = he;
…		…
379		462
380	FREETMPS;	463	FREETMPS;
381	LEAVE;	464	LEAVE;
382	}	465	}
383		466
384	for (i = 0; i < count; ++i)	467	encode_nl (enc); ++enc->indent;
		468
		469	while (count--)
385	{	470	{
386	encode_indent (enc);	471	encode_indent (enc);
		472	he = hes [count];
387	encode_he (enc, hes [i]);	473	encode_hk (enc, he);
		474	encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
388		475
389	if (i < count - 1)	476	if (count)
390	encode_comma (enc);	477	encode_comma (enc);
391	}	478	}
392		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	{
393	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);
394	}	530	}
395	else	531	else
396	{	532	{
397	SV *sv;	533	#if 0
398	HE *he = hv_iternext (hv);	534	if (0 && sv_derived_from (rv, "JSON::Literal"))
399
400	for (;;)
401	{	535	{
402	encode_indent (enc);	536	// not yet
403	encode_he (enc, he);
404
405	if (!(he = hv_iternext (hv)))
406	break;
407
408	encode_comma (enc);
409	}	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);
410		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
411	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))));
412	}	578	}
413	}	579	}
		580	else if (svt == SVt_PVHV)
		581	encode_hv (enc, (HV *)sv);
		582	else if (svt == SVt_PVAV)
		583	encode_av (enc, (AV *)sv);
		584	else if (svt < SVt_PVAV)
		585	{
		586	STRLEN len = 0;
		587	char *pv = svt ? SvPV (sv, len) : 0;
414		588
415	--enc->indent; encode_indent (enc); encode_ch (enc, '}');	589	if (len == 1 && *pv == '1')
		590	encode_str (enc, "true", 4, 0);
		591	else if (len == 1 && *pv == '0')
		592	encode_str (enc, "false", 5, 0);
		593	else
		594	croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
		595	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
		596	}
		597	else
		598	croak ("encountered %s, but JSON can only represent references to arrays or hashes",
		599	SvPV_nolen (sv_2mortal (newRV_inc (sv))));
416	}	600	}
417		601
418	static void	602	static void
419	encode_sv (enc_t *enc, SV *sv)	603	encode_sv (enc_t *enc, SV *sv)
420	{	604	{
…		…
428	encode_str (enc, str, len, SvUTF8 (sv));	612	encode_str (enc, str, len, SvUTF8 (sv));
429	encode_ch (enc, '"');	613	encode_ch (enc, '"');
430	}	614	}
431	else if (SvNOKp (sv))	615	else if (SvNOKp (sv))
432	{	616	{
		617	// trust that perl will do the right thing w.r.t. JSON syntax.
433	need (enc, NV_DIG + 32);	618	need (enc, NV_DIG + 32);
434	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);	619	Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
435	enc->cur += strlen (enc->cur);	620	enc->cur += strlen (enc->cur);
436	}	621	}
437	else if (SvIOKp (sv))	622	else if (SvIOKp (sv))
438	{	623	{
439	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);
440	enc->cur +=	629	enc->cur +=
441	SvIsUV(sv)	630	SvIsUV(sv)
442	? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv))	631	? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
443	: 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	}
444	}	661	}
445	else if (SvROK (sv))	662	else if (SvROK (sv))
446	{	663	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))	664	else if (!SvOK (sv))
463	encode_str (enc, "null", 4, 0);	665	encode_str (enc, "null", 4, 0);
464	else	666	else
465	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",
466	SvPV_nolen (sv), SvFLAGS (sv));	668	SvPV_nolen (sv), SvFLAGS (sv));
467	}	669	}
468		670
469	static SV *	671	static SV *
470	encode_json (SV *scalar, UV flags)	672	encode_json (SV *scalar, JSON *json)
471	{	673	{
		674	enc_t enc;
		675
472	if (!(flags & F_ALLOW_NONREF) && !SvROK (scalar))	676	if (!(json->flags & F_ALLOW_NONREF) && !SvROK (scalar))
473	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)");
474		678
475	enc_t enc;	679	enc.json = *json;
476	enc.flags = flags;
477	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));	680	enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
478	enc.cur = SvPVX (enc.sv);	681	enc.cur = SvPVX (enc.sv);
479	enc.end = SvEND (enc.sv);	682	enc.end = SvEND (enc.sv);
480	enc.indent = 0;	683	enc.indent = 0;
481	enc.max_depth = 0x7fffffffUL;	684	enc.maxdepth = DEC_DEPTH (enc.json.flags);
482		685
483	SvPOK_only (enc.sv);	686	SvPOK_only (enc.sv);
484	encode_sv (&enc, scalar);	687	encode_sv (&enc, scalar);
485		688
		689	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
		690	*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
		691
486	if (!(flags & (F_ASCII | F_UTF8)))	692	if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
487	SvUTF8_on (enc.sv);	693	SvUTF8_on (enc.sv);
488		694
489	SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
490
491	if (enc.flags & F_SHRINK)	695	if (enc.json.flags & F_SHRINK)
492	shrink (enc.sv);	696	shrink (enc.sv);
493		697
494	return enc.sv;	698	return enc.sv;
495	}	699	}
496		700
…		…
501	typedef struct	705	typedef struct
502	{	706	{
503	char *cur; // current parser pointer	707	char *cur; // current parser pointer
504	char *end; // end of input string	708	char *end; // end of input string
505	const char *err; // parse error, if != 0	709	const char *err; // parse error, if != 0
506	UV flags; // F_*	710	JSON json;
		711	U32 depth; // recursion depth
		712	U32 maxdepth; // recursion depth limit
507	} dec_t;	713	} dec_t;
508		714
509	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
510	decode_ws (dec_t *dec)	725	decode_ws (dec_t *dec)
511	{	726	{
512	for (;;)	727	for (;;)
513	{	728	{
514	char ch = *dec->cur;	729	char ch = *dec->cur;
515		730
516	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	}
517	|| (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09))	743	else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
518	break;	744	break; // parse error, but let higher level handle it, gives better error messages
519		745
520	++dec->cur;	746	++dec->cur;
521	}	747	}
522	}	748	}
523		749
524	#define ERR(reason) SB dec->err = reason; goto fail; SE	750	#define ERR(reason) SB dec->err = reason; goto fail; SE
		751
525	#define EXPECT_CH(ch) SB \	752	#define EXPECT_CH(ch) SB \
526	if (*dec->cur != ch) \	753	if (*dec->cur != ch) \
527	ERR (# ch " expected"); \	754	ERR (# ch " expected"); \
528	++dec->cur; \	755	++dec->cur; \
529	SE	756	SE
530		757
		758	#define DEC_INC_DEPTH if (++dec->depth > dec->maxdepth) ERR ("json datastructure exceeds maximum nesting level (set a higher max_depth)")
		759	#define DEC_DEC_DEPTH --dec->depth
		760
531	static SV *decode_sv (dec_t *dec);	761	static SV *decode_sv (dec_t *dec);
532		762
533	static signed char decode_hexdigit[256];	763	static signed char decode_hexdigit[256];
534		764
535	static UV	765	static UV
536	decode_4hex (dec_t *dec)	766	decode_4hex (dec_t *dec)
537	{	767	{
538	signed char d1, d2, d3, d4;	768	signed char d1, d2, d3, d4;
539	unsigned char *cur = (unsigned char *)dec->cur;	769	unsigned char *cur = (unsigned char *)dec->cur;
540		770
541	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");
542	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");
543	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");
544	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");
545		775
546	dec->cur += 4;	776	dec->cur += 4;
547		777
548	return ((UV)d1) << 12	778	return ((UV)d1) << 12
549	| ((UV)d2) << 8	779	| ((UV)d2) << 8
…		…
557	static SV *	787	static SV *
558	decode_str (dec_t *dec)	788	decode_str (dec_t *dec)
559	{	789	{
560	SV *sv = 0;	790	SV *sv = 0;
561	int utf8 = 0;	791	int utf8 = 0;
		792	char *dec_cur = dec->cur;
562		793
563	do	794	do
564	{	795	{
565	char buf [SHORT_STRING_LEN + UTF8_MAX_LEN];	796	char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
566	char *cur = buf;	797	char *cur = buf;
567		798
568	do	799	do
569	{	800	{
570	unsigned char ch = *(unsigned char *)dec->cur++;	801	unsigned char ch = *(unsigned char *)dec_cur++;
571		802
572	if (ch == '"')	803	if (expect_false (ch == '"'))
573	{	804	{
574	--dec->cur;	805	--dec_cur;
575	break;	806	break;
576	}	807	}
577	else if (ch == '\\')	808	else if (expect_false (ch == '\\'))
578	{	809	{
579	switch (*dec->cur)	810	switch (*dec_cur)
580	{	811	{
581	case '\\':	812	case '\\':
582	case '/':	813	case '/':
583	case '"': *cur++ = *dec->cur++; break;	814	case '"': *cur++ = *dec_cur++; break;
584		815
585	case 'b': ++dec->cur; *cur++ = '\010'; break;	816	case 'b': ++dec_cur; *cur++ = '\010'; break;
586	case 't': ++dec->cur; *cur++ = '\011'; break;	817	case 't': ++dec_cur; *cur++ = '\011'; break;
587	case 'n': ++dec->cur; *cur++ = '\012'; break;	818	case 'n': ++dec_cur; *cur++ = '\012'; break;
588	case 'f': ++dec->cur; *cur++ = '\014'; break;	819	case 'f': ++dec_cur; *cur++ = '\014'; break;
589	case 'r': ++dec->cur; *cur++ = '\015'; break;	820	case 'r': ++dec_cur; *cur++ = '\015'; break;
590		821
591	case 'u':	822	case 'u':
592	{	823	{
593	UV lo, hi;	824	UV lo, hi;
594	++dec->cur;	825	++dec_cur;
595		826
		827	dec->cur = dec_cur;
596	hi = decode_4hex (dec);	828	hi = decode_4hex (dec);
		829	dec_cur = dec->cur;
597	if (hi == (UV)-1)	830	if (hi == (UV)-1)
598	goto fail;	831	goto fail;
599		832
600	// possibly a surrogate pair	833	// possibly a surrogate pair
601	if (hi >= 0xd800)	834	if (hi >= 0xd800)
602	if (hi < 0xdc00)	835	if (hi < 0xdc00)
603	{	836	{
604	if (dec->cur [0] != '\\' || dec->cur [1] != 'u')	837	if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
605	ERR ("missing low surrogate character in surrogate pair");	838	ERR ("missing low surrogate character in surrogate pair");
606		839
607	dec->cur += 2;	840	dec_cur += 2;
608		841
		842	dec->cur = dec_cur;
609	lo = decode_4hex (dec);	843	lo = decode_4hex (dec);
		844	dec_cur = dec->cur;
610	if (lo == (UV)-1)	845	if (lo == (UV)-1)
611	goto fail;	846	goto fail;
612		847
613	if (lo < 0xdc00 || lo >= 0xe000)	848	if (lo < 0xdc00 || lo >= 0xe000)
614	ERR ("surrogate pair expected");	849	ERR ("surrogate pair expected");
…		…
628	*cur++ = hi;	863	*cur++ = hi;
629	}	864	}
630	break;	865	break;
631		866
632	default:	867	default:
633	--dec->cur;	868	--dec_cur;
634	ERR ("illegal backslash escape sequence in string");	869	ERR ("illegal backslash escape sequence in string");
635	}	870	}
636	}	871	}
637	else if (ch >= 0x20 && ch <= 0x7f)	872	else if (expect_true (ch >= 0x20 && ch <= 0x7f))
638	*cur++ = ch;	873	*cur++ = ch;
639	else if (ch >= 0x80)	874	else if (ch >= 0x80)
640	{	875	{
641	--dec->cur;
642
643	STRLEN clen;	876	STRLEN clen;
		877	UV uch;
		878
		879	--dec_cur;
		880
644	UV uch = decode_utf8 (dec->cur, dec->end - dec->cur, &clen);	881	uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
645	if (clen == (STRLEN)-1)	882	if (clen == (STRLEN)-1)
646	ERR ("malformed UTF-8 character in JSON string");	883	ERR ("malformed UTF-8 character in JSON string");
647		884
648	do	885	do
649	{
650	*cur++ = *dec->cur++;	886	*cur++ = *dec_cur++;
651	}
652	while (--clen);	887	while (--clen);
653		888
654	utf8 = 1;	889	utf8 = 1;
655	}	890	}
656	else if (!ch)
657	ERR ("unexpected end of string while parsing json string");
658	else	891	else
		892	{
		893	--dec_cur;
		894
		895	if (!ch)
		896	ERR ("unexpected end of string while parsing JSON string");
		897	else
659	ERR ("invalid character encountered");	898	ERR ("invalid character encountered while parsing JSON string");
660		899	}
661	}	900	}
662	while (cur < buf + SHORT_STRING_LEN);	901	while (cur < buf + SHORT_STRING_LEN);
663		902
		903	{
664	STRLEN len = cur - buf;	904	STRLEN len = cur - buf;
665		905
666	if (sv)	906	if (sv)
667	{	907	{
668	SvGROW (sv, SvCUR (sv) + len + 1);	908	SvGROW (sv, SvCUR (sv) + len + 1);
669	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);	909	memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
670	SvCUR_set (sv, SvCUR (sv) + len);	910	SvCUR_set (sv, SvCUR (sv) + len);
671	}	911	}
672	else	912	else
673	sv = newSVpvn (buf, len);	913	sv = newSVpvn (buf, len);
674	}	914	}
		915	}
675	while (*dec->cur != '"');	916	while (*dec_cur != '"');
676		917
677	++dec->cur;	918	++dec_cur;
678		919
679	if (sv)	920	if (sv)
680	{	921	{
681	SvPOK_only (sv);	922	SvPOK_only (sv);
682	*SvEND (sv) = 0;	923	*SvEND (sv) = 0;
…		…
685	SvUTF8_on (sv);	926	SvUTF8_on (sv);
686	}	927	}
687	else	928	else
688	sv = newSVpvn ("", 0);	929	sv = newSVpvn ("", 0);
689		930
		931	dec->cur = dec_cur;
690	return sv;	932	return sv;
691		933
692	fail:	934	fail:
		935	dec->cur = dec_cur;
693	return 0;	936	return 0;
694	}	937	}
695		938
696	static SV *	939	static SV *
697	decode_num (dec_t *dec)	940	decode_num (dec_t *dec)
…		…
755	is_nv = 1;	998	is_nv = 1;
756	}	999	}
757		1000
758	if (!is_nv)	1001	if (!is_nv)
759	{	1002	{
760	UV uv;	1003	int len = dec->cur - start;
761	int numtype = grok_number (start, dec->cur - start, &uv);	1004
762	if (numtype & IS_NUMBER_IN_UV)	1005	// special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
763	if (numtype & IS_NUMBER_NEG)	1006	if (*start == '-')
		1007	switch (len)
764	{	1008	{
765	if (uv < (UV)IV_MIN)	1009	case 2: return newSViv (-( start [1] - '0' * 1));
766	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));
767	}	1013	}
		1014	else
		1015	switch (len)
		1016	{
		1017	case 1: return newSViv ( start [0] - '0' * 1);
		1018	case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
		1019	case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
		1020	case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
		1021	}
		1022
		1023	{
		1024	UV uv;
		1025	int numtype = grok_number (start, len, &uv);
		1026	if (numtype & IS_NUMBER_IN_UV)
		1027	if (numtype & IS_NUMBER_NEG)
		1028	{
		1029	if (uv < (UV)IV_MIN)
		1030	return newSViv (-(IV)uv);
		1031	}
768	else	1032	else
769	return newSVuv (uv);	1033	return newSVuv (uv);
770	}	1034	}
771		1035
		1036	len -= *start == '-' ? 1 : 0;
		1037
		1038	// does not fit into IV or UV, try NV
		1039	if ((sizeof (NV) == sizeof (double) && DBL_DIG >= len)
		1040	#if defined (LDBL_DIG)
		1041	|| (sizeof (NV) == sizeof (long double) && LDBL_DIG >= len)
		1042	#endif
		1043	)
		1044	// fits into NV without loss of precision
		1045	return newSVnv (Atof (start));
		1046
		1047	// everything else fails, convert it to a string
		1048	return newSVpvn (start, dec->cur - start);
		1049	}
		1050
		1051	// loss of precision here
772	return newSVnv (Atof (start));	1052	return newSVnv (Atof (start));
773		1053
774	fail:	1054	fail:
775	return 0;	1055	return 0;
776	}	1056	}
…		…
778	static SV *	1058	static SV *
779	decode_av (dec_t *dec)	1059	decode_av (dec_t *dec)
780	{	1060	{
781	AV *av = newAV ();	1061	AV *av = newAV ();
782		1062
		1063	DEC_INC_DEPTH;
783	decode_ws (dec);	1064	decode_ws (dec);
		1065
784	if (*dec->cur == ']')	1066	if (*dec->cur == ']')
785	++dec->cur;	1067	++dec->cur;
786	else	1068	else
787	for (;;)	1069	for (;;)
788	{	1070	{
…		…
804		1086
805	if (*dec->cur != ',')	1087	if (*dec->cur != ',')
806	ERR (", or ] expected while parsing array");	1088	ERR (", or ] expected while parsing array");
807		1089
808	++dec->cur;	1090	++dec->cur;
		1091
		1092	decode_ws (dec);
		1093
		1094	if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
		1095	{
		1096	++dec->cur;
		1097	break;
		1098	}
809	}	1099	}
810		1100
		1101	DEC_DEC_DEPTH;
811	return newRV_noinc ((SV *)av);	1102	return newRV_noinc ((SV *)av);
812		1103
813	fail:	1104	fail:
814	SvREFCNT_dec (av);	1105	SvREFCNT_dec (av);
		1106	DEC_DEC_DEPTH;
815	return 0;	1107	return 0;
816	}	1108	}
817		1109
818	static SV *	1110	static SV *
819	decode_hv (dec_t *dec)	1111	decode_hv (dec_t *dec)
820	{	1112	{
		1113	SV *sv;
821	HV *hv = newHV ();	1114	HV *hv = newHV ();
822		1115
		1116	DEC_INC_DEPTH;
823	decode_ws (dec);	1117	decode_ws (dec);
		1118
824	if (*dec->cur == '}')	1119	if (*dec->cur == '}')
825	++dec->cur;	1120	++dec->cur;
826	else	1121	else
827	for (;;)	1122	for (;;)
828	{	1123	{
		1124	EXPECT_CH ('"');
		1125
		1126	// heuristic: assume that
		1127	// a) decode_str + hv_store_ent are abysmally slow.
		1128	// b) most hash keys are short, simple ascii text.
		1129	// => try to "fast-match" such strings to avoid
		1130	// the overhead of decode_str + hv_store_ent.
		1131	{
829	SV *key, *value;	1132	SV *value;
		1133	char *p = dec->cur;
		1134	char *e = p + 24; // only try up to 24 bytes
830		1135
831	decode_ws (dec); EXPECT_CH ('"');	1136	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	{	1137	{
		1138	// the >= 0x80 is true on most architectures
		1139	if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
		1140	{
		1141	// slow path, back up and use decode_str
		1142	SV *key = decode_str (dec);
		1143	if (!key)
		1144	goto fail;
		1145
		1146	decode_ws (dec); EXPECT_CH (':');
		1147
		1148	decode_ws (dec);
		1149	value = decode_sv (dec);
		1150	if (!value)
		1151	{
		1152	SvREFCNT_dec (key);
		1153	goto fail;
		1154	}
		1155
		1156	hv_store_ent (hv, key, value, 0);
842	SvREFCNT_dec (key);	1157	SvREFCNT_dec (key);
		1158
		1159	break;
		1160	}
		1161	else if (*p == '"')
		1162	{
		1163	// fast path, got a simple key
		1164	char *key = dec->cur;
		1165	int len = p - key;
		1166	dec->cur = p + 1;
		1167
		1168	decode_ws (dec); EXPECT_CH (':');
		1169
		1170	decode_ws (dec);
		1171	value = decode_sv (dec);
		1172	if (!value)
843	goto fail;	1173	goto fail;
		1174
		1175	hv_store (hv, key, len, value, 0);
		1176
		1177	break;
		1178	}
		1179
		1180	++p;
844	}	1181	}
845		1182	}
846	//TODO: optimise
847	hv_store_ent (hv, key, value, 0);
848		1183
849	decode_ws (dec);	1184	decode_ws (dec);
850		1185
851	if (*dec->cur == '}')	1186	if (*dec->cur == '}')
852	{	1187	{
…		…
856		1191
857	if (*dec->cur != ',')	1192	if (*dec->cur != ',')
858	ERR (", or } expected while parsing object/hash");	1193	ERR (", or } expected while parsing object/hash");
859		1194
860	++dec->cur;	1195	++dec->cur;
		1196
		1197	decode_ws (dec);
		1198
		1199	if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
		1200	{
		1201	++dec->cur;
		1202	break;
		1203	}
861	}	1204	}
862		1205
		1206	DEC_DEC_DEPTH;
863	return newRV_noinc ((SV *)hv);	1207	sv = newRV_noinc ((SV *)hv);
		1208
		1209	// check filter callbacks
		1210	if (dec->json.flags & F_HOOK)
		1211	{
		1212	if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
		1213	{
		1214	HE *cb, *he;
		1215
		1216	hv_iterinit (hv);
		1217	he = hv_iternext (hv);
		1218	hv_iterinit (hv);
		1219
		1220	// the next line creates a mortal sv each time its called.
		1221	// might want to optimise this for common cases.
		1222	cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
		1223
		1224	if (cb)
		1225	{
		1226	dSP;
		1227	int count;
		1228
		1229	ENTER; SAVETMPS; PUSHMARK (SP);
		1230	XPUSHs (HeVAL (he));
		1231
		1232	PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
		1233
		1234	if (count == 1)
		1235	{
		1236	sv = newSVsv (POPs);
		1237	FREETMPS; LEAVE;
		1238	return sv;
		1239	}
		1240
		1241	FREETMPS; LEAVE;
		1242	}
		1243	}
		1244
		1245	if (dec->json.cb_object)
		1246	{
		1247	dSP;
		1248	int count;
		1249
		1250	ENTER; SAVETMPS; PUSHMARK (SP);
		1251	XPUSHs (sv_2mortal (sv));
		1252
		1253	PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
		1254
		1255	if (count == 1)
		1256	{
		1257	sv = newSVsv (POPs);
		1258	FREETMPS; LEAVE;
		1259	return sv;
		1260	}
		1261
		1262	SvREFCNT_inc (sv);
		1263	FREETMPS; LEAVE;
		1264	}
		1265	}
		1266
		1267	return sv;
864		1268
865	fail:	1269	fail:
866	SvREFCNT_dec (hv);	1270	SvREFCNT_dec (hv);
		1271	DEC_DEC_DEPTH;
867	return 0;	1272	return 0;
868	}	1273	}
869		1274
870	static SV *	1275	static SV *
871	decode_sv (dec_t *dec)	1276	decode_sv (dec_t *dec)
872	{	1277	{
873	decode_ws (dec);	1278	// the beauty of JSON: you need exactly one character lookahead
		1279	// to parse anything.
874	switch (*dec->cur)	1280	switch (*dec->cur)
875	{	1281	{
876	case '"': ++dec->cur; return decode_str (dec);	1282	case '"': ++dec->cur; return decode_str (dec);
877	case '[': ++dec->cur; return decode_av (dec);	1283	case '[': ++dec->cur; return decode_av (dec);
878	case '{': ++dec->cur; return decode_hv (dec);	1284	case '{': ++dec->cur; return decode_hv (dec);
…		…
884		1290
885	case 't':	1291	case 't':
886	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))	1292	if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
887	{	1293	{
888	dec->cur += 4;	1294	dec->cur += 4;
889	return newSViv (1);	1295	#if JSON_SLOW
		1296	json_true = get_sv ("JSON::XS::true", 1); SvREADONLY_on (json_true);
		1297	#endif
		1298	return SvREFCNT_inc (json_true);
890	}	1299	}
891	else	1300	else
892	ERR ("'true' expected");	1301	ERR ("'true' expected");
893		1302
894	break;	1303	break;
895		1304
896	case 'f':	1305	case 'f':
897	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))	1306	if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
898	{	1307	{
899	dec->cur += 5;	1308	dec->cur += 5;
900	return newSViv (0);	1309	#if JSON_SLOW
		1310	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
		1311	#endif
		1312	return SvREFCNT_inc (json_false);
901	}	1313	}
902	else	1314	else
903	ERR ("'false' expected");	1315	ERR ("'false' expected");
904		1316
905	break;	1317	break;
…		…
914	ERR ("'null' expected");	1326	ERR ("'null' expected");
915		1327
916	break;	1328	break;
917		1329
918	default:	1330	default:
919	ERR ("malformed json string, neither array, object, number, string or atom");	1331	ERR ("malformed JSON string, neither array, object, number, string or atom");
920	break;	1332	break;
921	}	1333	}
922		1334
923	fail:	1335	fail:
924	return 0;	1336	return 0;
925	}	1337	}
926		1338
927	static SV *	1339	static SV *
928	decode_json (SV *string, UV flags)	1340	decode_json (SV *string, JSON *json, UV *offset_return)
929	{	1341	{
		1342	dec_t dec;
		1343	UV offset;
930	SV *sv;	1344	SV *sv;
931		1345
		1346	SvGETMAGIC (string);
		1347	SvUPGRADE (string, SVt_PV);
		1348
		1349	if (json->flags & F_MAXSIZE && SvCUR (string) > DEC_SIZE (json->flags))
		1350	croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
		1351	(unsigned long)SvCUR (string), (unsigned long)DEC_SIZE (json->flags));
		1352
932	if (flags & F_UTF8)	1353	if (json->flags & F_UTF8)
933	sv_utf8_downgrade (string, 0);	1354	sv_utf8_downgrade (string, 0);
934	else	1355	else
935	sv_utf8_upgrade (string);	1356	sv_utf8_upgrade (string);
936		1357
937	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP	1358	SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
938		1359
939	dec_t dec;	1360	dec.json = *json;
940	dec.flags = flags;
941	dec.cur = SvPVX (string);	1361	dec.cur = SvPVX (string);
942	dec.end = SvEND (string);	1362	dec.end = SvEND (string);
943	dec.err = 0;	1363	dec.err = 0;
		1364	dec.depth = 0;
		1365	dec.maxdepth = DEC_DEPTH (dec.json.flags);
944		1366
		1367	if (dec.json.cb_object || dec.json.cb_sk_object)
		1368	dec.json.flags |= F_HOOK;
		1369
		1370	*dec.end = 0; // this should basically be a nop, too, but make sure it's there
		1371
		1372	decode_ws (&dec);
945	sv = decode_sv (&dec);	1373	sv = decode_sv (&dec);
946		1374
		1375	if (!(offset_return || !sv))
		1376	{
		1377	// check for trailing garbage
		1378	decode_ws (&dec);
		1379
		1380	if (*dec.cur)
		1381	{
		1382	dec.err = "garbage after JSON object";
		1383	SvREFCNT_dec (sv);
		1384	sv = 0;
		1385	}
		1386	}
		1387
		1388	if (offset_return || !sv)
		1389	{
		1390	offset = dec.json.flags & F_UTF8
		1391	? dec.cur - SvPVX (string)
		1392	: utf8_distance (dec.cur, SvPVX (string));
		1393
		1394	if (offset_return)
		1395	*offset_return = offset;
		1396	}
		1397
947	if (!sv)	1398	if (!sv)
948	{	1399	{
949	IV offset = dec.flags & F_UTF8
950	? dec.cur - SvPVX (string)
951	: utf8_distance (dec.cur, SvPVX (string));
952	SV *uni = sv_newmortal ();	1400	SV *uni = sv_newmortal ();
953		1401
954	// horrible hack to silence warning inside pv_uni_display	1402	// horrible hack to silence warning inside pv_uni_display
955	COP cop = *PL_curcop;	1403	COP cop = *PL_curcop;
956	cop.cop_warnings = pWARN_NONE;	1404	cop.cop_warnings = pWARN_NONE;
…		…
958	SAVEVPTR (PL_curcop);	1406	SAVEVPTR (PL_curcop);
959	PL_curcop = &cop;	1407	PL_curcop = &cop;
960	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);	1408	pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
961	LEAVE;	1409	LEAVE;
962		1410
963	croak ("%s, at character offset %d (%s)",	1411	croak ("%s, at character offset %d [\"%s\"]",
964	dec.err,	1412	dec.err,
965	(int)offset,	1413	(int)offset,
966	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");	1414	dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
967	}	1415	}
968		1416
969	sv = sv_2mortal (sv);	1417	sv = sv_2mortal (sv);
970		1418
971	if (!(dec.flags & F_ALLOW_NONREF) && !SvROK (sv))	1419	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)");	1420	croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
973		1421
974	return sv;	1422	return sv;
975	}	1423	}
976		1424
…		…
981		1429
982	BOOT:	1430	BOOT:
983	{	1431	{
984	int i;	1432	int i;
985		1433
986	memset (decode_hexdigit, 0xff, 256);
987	for (i = 10; i--; )	1434	for (i = 0; i < 256; ++i)
988	decode_hexdigit ['0' + i] = i;	1435	decode_hexdigit [i] =
		1436	i >= '0' && i <= '9' ? i - '0'
		1437	: i >= 'a' && i <= 'f' ? i - 'a' + 10
		1438	: i >= 'A' && i <= 'F' ? i - 'A' + 10
		1439	: -1;
989		1440
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);	1441	json_stash = gv_stashpv ("JSON::XS" , 1);
		1442	json_boolean_stash = gv_stashpv ("JSON::XS::Boolean", 1);
		1443
		1444	json_true = get_sv ("JSON::XS::true" , 1); SvREADONLY_on (json_true );
		1445	json_false = get_sv ("JSON::XS::false", 1); SvREADONLY_on (json_false);
997	}	1446	}
998		1447
999	PROTOTYPES: DISABLE	1448	PROTOTYPES: DISABLE
1000		1449
1001	SV *new (char *dummy)	1450	void CLONE (...)
1002	CODE:	1451	CODE:
1003	RETVAL = sv_bless (newRV_noinc (newSVuv (F_DEFAULT)), json_stash);	1452	json_stash = 0;
		1453	json_boolean_stash = 0;
		1454
		1455	void new (char *klass)
		1456	PPCODE:
		1457	{
		1458	SV *pv = NEWSV (0, sizeof (JSON));
		1459	SvPOK_only (pv);
		1460	Zero (SvPVX (pv), 1, JSON);
		1461	((JSON *)SvPVX (pv))->flags = F_DEFAULT;
		1462	XPUSHs (sv_2mortal (sv_bless (
		1463	newRV_noinc (pv),
		1464	strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
		1465	)));
		1466	}
		1467
		1468	void ascii (JSON *self, int enable = 1)
		1469	ALIAS:
		1470	ascii = F_ASCII
		1471	latin1 = F_LATIN1
		1472	utf8 = F_UTF8
		1473	indent = F_INDENT
		1474	canonical = F_CANONICAL
		1475	space_before = F_SPACE_BEFORE
		1476	space_after = F_SPACE_AFTER
		1477	pretty = F_PRETTY
		1478	allow_nonref = F_ALLOW_NONREF
		1479	shrink = F_SHRINK
		1480	allow_blessed = F_ALLOW_BLESSED
		1481	convert_blessed = F_CONV_BLESSED
		1482	relaxed = F_RELAXED
		1483	PPCODE:
		1484	{
		1485	if (enable)
		1486	self->flags |= ix;
		1487	else
		1488	self->flags &= ~ix;
		1489
		1490	XPUSHs (ST (0));
		1491	}
		1492
		1493	void get_ascii (JSON *self)
		1494	ALIAS:
		1495	get_ascii = F_ASCII
		1496	get_latin1 = F_LATIN1
		1497	get_utf8 = F_UTF8
		1498	get_indent = F_INDENT
		1499	get_canonical = F_CANONICAL
		1500	get_space_before = F_SPACE_BEFORE
		1501	get_space_after = F_SPACE_AFTER
		1502	get_allow_nonref = F_ALLOW_NONREF
		1503	get_shrink = F_SHRINK
		1504	get_allow_blessed = F_ALLOW_BLESSED
		1505	get_convert_blessed = F_CONV_BLESSED
		1506	get_relaxed = F_RELAXED
		1507	PPCODE:
		1508	XPUSHs (boolSV (self->flags & ix));
		1509
		1510	void max_depth (JSON *self, UV max_depth = 0x80000000UL)
		1511	PPCODE:
		1512	{
		1513	UV log2 = 0;
		1514
		1515	if (max_depth > 0x80000000UL) max_depth = 0x80000000UL;
		1516
		1517	while ((1UL << log2) < max_depth)
		1518	++log2;
		1519
		1520	self->flags = self->flags & ~F_MAXDEPTH | (log2 << S_MAXDEPTH);
		1521
		1522	XPUSHs (ST (0));
		1523	}
		1524
		1525	U32 get_max_depth (JSON *self)
		1526	CODE:
		1527	RETVAL = DEC_DEPTH (self->flags);
1004	OUTPUT:	1528	OUTPUT:
1005	RETVAL	1529	RETVAL
1006		1530
1007	SV *ascii (SV *self, int enable = 1)	1531	void max_size (JSON *self, UV max_size = 0)
1008	ALIAS:	1532	PPCODE:
1009	ascii = F_ASCII	1533	{
1010	utf8 = F_UTF8	1534	UV log2 = 0;
1011	indent = F_INDENT	1535
1012	canonical = F_CANONICAL	1536	if (max_size > 0x80000000UL) max_size = 0x80000000UL;
1013	space_before = F_SPACE_BEFORE	1537	if (max_size == 1) max_size = 2;
1014	space_after = F_SPACE_AFTER	1538
1015	pretty = F_PRETTY	1539	while ((1UL << log2) < max_size)
1016	allow_nonref = F_ALLOW_NONREF	1540	++log2;
1017	shrink = F_SHRINK	1541
		1542	self->flags = self->flags & ~F_MAXSIZE | (log2 << S_MAXSIZE);
		1543
		1544	XPUSHs (ST (0));
		1545	}
		1546
		1547	int get_max_size (JSON *self)
1018	CODE:	1548	CODE:
1019	{	1549	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:	1550	OUTPUT:
1029	RETVAL	1551	RETVAL
1030		1552
1031	void encode (SV *self, SV *scalar)	1553	void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
1032	PPCODE:	1554	PPCODE:
1033	XPUSHs (encode_json (scalar, *SvJSON (self)));	1555	{
		1556	SvREFCNT_dec (self->cb_object);
		1557	self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
1034		1558
1035	void decode (SV *self, SV *jsonstr)	1559	XPUSHs (ST (0));
		1560	}
		1561
		1562	void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
1036	PPCODE:	1563	PPCODE:
		1564	{
		1565	if (!self->cb_sk_object)
		1566	self->cb_sk_object = newHV ();
		1567
		1568	if (SvOK (cb))
		1569	hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
		1570	else
		1571	{
		1572	hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
		1573
		1574	if (!HvKEYS (self->cb_sk_object))
		1575	{
		1576	SvREFCNT_dec (self->cb_sk_object);
		1577	self->cb_sk_object = 0;
		1578	}
		1579	}
		1580
		1581	XPUSHs (ST (0));
		1582	}
		1583
		1584	void encode (JSON *self, SV *scalar)
		1585	PPCODE:
		1586	XPUSHs (encode_json (scalar, self));
		1587
		1588	void decode (JSON *self, SV *jsonstr)
		1589	PPCODE:
1037	XPUSHs (decode_json (jsonstr, *SvJSON (self)));	1590	XPUSHs (decode_json (jsonstr, self, 0));
		1591
		1592	void decode_prefix (JSON *self, SV *jsonstr)
		1593	PPCODE:
		1594	{
		1595	UV offset;
		1596	EXTEND (SP, 2);
		1597	PUSHs (decode_json (jsonstr, self, &offset));
		1598	PUSHs (sv_2mortal (newSVuv (offset)));
		1599	}
		1600
		1601	void DESTROY (JSON *self)
		1602	CODE:
		1603	SvREFCNT_dec (self->cb_sk_object);
		1604	SvREFCNT_dec (self->cb_object);
1038		1605
1039	PROTOTYPES: ENABLE	1606	PROTOTYPES: ENABLE
1040		1607
1041	void to_json (SV *scalar)	1608	void to_json (SV *scalar)
1042	ALIAS:
1043	objToJson = 0
1044	PPCODE:	1609	PPCODE:
		1610	{
		1611	JSON json = { F_DEFAULT | F_UTF8 };
1045	XPUSHs (encode_json (scalar, F_UTF8));	1612	XPUSHs (encode_json (scalar, &json));
		1613	}
1046		1614
1047	void from_json (SV *jsonstr)	1615	void from_json (SV *jsonstr)
1048	ALIAS:
1049	jsonToObj = 0
1050	PPCODE:	1616	PPCODE:
		1617	{
		1618	JSON json = { F_DEFAULT | F_UTF8 };
1051	XPUSHs (decode_json (jsonstr, F_UTF8));	1619	XPUSHs (decode_json (jsonstr, &json, 0));
		1620	}
1052		1621

Diff Legend

–	Removed lines
+	Added lines
<	Changed lines
>	Changed lines