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Comparing JSON-XS/XS.xs (file contents):
Revision 1.25 by root, Fri Apr 6 20:37:22 2007 UTC vs.
Revision 1.42 by root, Sat Jun 23 22:56:08 2007 UTC

… …
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
10#if defined(__BORLANDC__) || defined(_MSC_VER)
11# define snprintf _snprintf // C compilers have this in stdio.h
12#endif
13
14// some old perls do not have this, try to make it work, no
15// guarentees, though. if it breaks, you get to keep the pieces.
16#ifndef UTF8_MAXBYTES
17# define UTF8_MAXBYTES 13
18#endif
8 19
9#define F_ASCII 0x00000001UL 20#define F_ASCII 0x00000001UL
21#define F_LATIN1 0x00000002UL
10#define F_UTF8 0x00000002UL 22#define F_UTF8 0x00000004UL
11#define F_INDENT 0x00000004UL 23#define F_INDENT 0x00000008UL
12#define F_CANONICAL 0x00000008UL 24#define F_CANONICAL 0x00000010UL
13#define F_SPACE_BEFORE 0x00000010UL 25#define F_SPACE_BEFORE 0x00000020UL
14#define F_SPACE_AFTER 0x00000020UL 26#define F_SPACE_AFTER 0x00000040UL
15#define F_ALLOW_NONREF 0x00000080UL 27#define F_ALLOW_NONREF 0x00000100UL
16#define F_SHRINK 0x00000100UL 28#define F_SHRINK 0x00000200UL
17#define F_MAXDEPTH 0xf8000000UL 29#define F_MAXDEPTH 0xf8000000UL
18#define S_MAXDEPTH 27 30#define S_MAXDEPTH 27
19 31
20#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH)) 32#define DEC_DEPTH(flags) (1UL << ((flags & F_MAXDEPTH) >> S_MAXDEPTH))
21 33
… …
26#define F_DEFAULT (9UL << S_MAXDEPTH) 38#define F_DEFAULT (9UL << S_MAXDEPTH)
27 39
28#define INIT_SIZE 32 // initial scalar size to be allocated 40#define INIT_SIZE 32 // initial scalar size to be allocated
29#define INDENT_STEP 3 // spaces per indentation level 41#define INDENT_STEP 3 // spaces per indentation level
30 42
31#define UTF8_MAX_LEN 11 // for perls UTF-X: max. number of octets per character
32#define SHORT_STRING_LEN 512 // special-case strings of up to this size 43#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
33 44
34#define SB do { 45#define SB do {
35#define SE } while (0) 46#define SE } while (0)
47
48#if __GNUC__ >= 3
49# define expect(expr,value) __builtin_expect ((expr),(value))
50# define inline inline
51#else
52# define expect(expr,value) (expr)
53# define inline static
54#endif
55
56#define expect_false(expr) expect ((expr) != 0, 0)
57#define expect_true(expr) expect ((expr) != 0, 1)
36 58
37static HV *json_stash; // JSON::XS:: 59static HV *json_stash; // JSON::XS::
38 60
39///////////////////////////////////////////////////////////////////////////// 61/////////////////////////////////////////////////////////////////////////////
40// utility functions 62// utility functions
… …
65// decode an utf-8 character and return it, or (UV)-1 in 87// decode an utf-8 character and return it, or (UV)-1 in
66// case of an error. 88// case of an error.
67// we special-case "safe" characters from U+80 .. U+7FF, 89// we special-case "safe" characters from U+80 .. U+7FF,
68// but use the very good perl function to parse anything else. 90// but use the very good perl function to parse anything else.
69// note that we never call this function for a ascii codepoints 91// note that we never call this function for a ascii codepoints
70static UV 92inline UV
71decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen) 93decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
72{ 94{
73 if (s[0] > 0xdf || s[0] < 0xc2) 95 if (expect_false (s[0] > 0xdf || s[0] < 0xc2))
74 return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY); 96 return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
75 else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf) 97 else if (len > 1 && s[1] >= 0x80 && s[1] <= 0xbf)
76 { 98 {
77 *clen = 2; 99 *clen = 2;
78 return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f); 100 return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
… …
96 U32 flags; // F_* 118 U32 flags; // F_*
97 U32 indent; // indentation level 119 U32 indent; // indentation level
98 U32 maxdepth; // max. indentation/recursion level 120 U32 maxdepth; // max. indentation/recursion level
99} enc_t; 121} enc_t;
100 122
101static void 123inline void
102need (enc_t *enc, STRLEN len) 124need (enc_t *enc, STRLEN len)
103{ 125{
104 if (enc->cur + len >= enc->end) 126 if (expect_false (enc->cur + len >= enc->end))
105 { 127 {
106 STRLEN cur = enc->cur - SvPVX (enc->sv); 128 STRLEN cur = enc->cur - SvPVX (enc->sv);
107 SvGROW (enc->sv, cur + len + 1); 129 SvGROW (enc->sv, cur + len + 1);
108 enc->cur = SvPVX (enc->sv) + cur; 130 enc->cur = SvPVX (enc->sv) + cur;
109 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv); 131 enc->end = SvPVX (enc->sv) + SvLEN (enc->sv) - 1;
110 } 132 }
111} 133}
112 134
113static void 135inline void
114encode_ch (enc_t *enc, char ch) 136encode_ch (enc_t *enc, char ch)
115{ 137{
116 need (enc, 1); 138 need (enc, 1);
117 *enc->cur++ = ch; 139 *enc->cur++ = ch;
118} 140}
… …
126 148
127 while (str < end) 149 while (str < end)
128 { 150 {
129 unsigned char ch = *(unsigned char *)str; 151 unsigned char ch = *(unsigned char *)str;
130 152
131 if (ch >= 0x20 && ch < 0x80) // most common case 153 if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
132 { 154 {
133 if (ch == '"') // but with slow exceptions 155 if (expect_false (ch == '"')) // but with slow exceptions
134 { 156 {
135 need (enc, len += 1); 157 need (enc, len += 1);
136 *enc->cur++ = '\\'; 158 *enc->cur++ = '\\';
137 *enc->cur++ = '"'; 159 *enc->cur++ = '"';
138 } 160 }
139 else if (ch == '\\') 161 else if (expect_false (ch == '\\'))
140 { 162 {
141 need (enc, len += 1); 163 need (enc, len += 1);
142 *enc->cur++ = '\\'; 164 *enc->cur++ = '\\';
143 *enc->cur++ = '\\'; 165 *enc->cur++ = '\\';
144 } 166 }
… …
162 STRLEN clen; 184 STRLEN clen;
163 UV uch; 185 UV uch;
164 186
165 if (is_utf8) 187 if (is_utf8)
166 { 188 {
167 //uch = utf8n_to_uvuni (str, end - str, &clen, UTF8_CHECK_ONLY);
168 uch = decode_utf8 (str, end - str, &clen); 189 uch = decode_utf8 (str, end - str, &clen);
169 if (clen == (STRLEN)-1) 190 if (clen == (STRLEN)-1)
170 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str); 191 croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
171 } 192 }
172 else 193 else
… …
176 } 197 }
177 198
178 if (uch > 0x10FFFFUL) 199 if (uch > 0x10FFFFUL)
179 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch); 200 croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
180 201
181 if (uch < 0x80 || enc->flags & F_ASCII) 202 if (uch < 0x80 || enc->flags & F_ASCII || (enc->flags & F_LATIN1 && uch > 0xFF))
182 { 203 {
183 if (uch > 0xFFFFUL) 204 if (uch > 0xFFFFUL)
184 { 205 {
185 need (enc, len += 11); 206 need (enc, len += 11);
186 sprintf (enc->cur, "\\u%04x\\u%04x", 207 sprintf (enc->cur, "\\u%04x\\u%04x",
… …
200 *enc->cur++ = hexdigit [(uch >> 0) & 15]; 221 *enc->cur++ = hexdigit [(uch >> 0) & 15];
201 } 222 }
202 223
203 str += clen; 224 str += clen;
204 } 225 }
226 else if (enc->flags & F_LATIN1)
227 {
228 *enc->cur++ = uch;
229 str += clen;
230 }
205 else if (is_utf8) 231 else if (is_utf8)
206 { 232 {
207 need (enc, len += clen); 233 need (enc, len += clen);
208 do 234 do
209 { 235 {
… …
211 } 237 }
212 while (--clen); 238 while (--clen);
213 } 239 }
214 else 240 else
215 { 241 {
216 need (enc, len += UTF8_MAX_LEN - 1); // never more than 11 bytes needed 242 need (enc, len += UTF8_MAXBYTES - 1); // never more than 11 bytes needed
217 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0); 243 enc->cur = uvuni_to_utf8_flags (enc->cur, uch, 0);
218 ++str; 244 ++str;
219 } 245 }
220 } 246 }
221 } 247 }
… …
223 249
224 --len; 250 --len;
225 } 251 }
226} 252}
227 253
228static void 254inline void
229encode_indent (enc_t *enc) 255encode_indent (enc_t *enc)
230{ 256{
231 if (enc->flags & F_INDENT) 257 if (enc->flags & F_INDENT)
232 { 258 {
233 int spaces = enc->indent * INDENT_STEP; 259 int spaces = enc->indent * INDENT_STEP;
… …
236 memset (enc->cur, ' ', spaces); 262 memset (enc->cur, ' ', spaces);
237 enc->cur += spaces; 263 enc->cur += spaces;
238 } 264 }
239} 265}
240 266
241static void 267inline void
242encode_space (enc_t *enc) 268encode_space (enc_t *enc)
243{ 269{
244 need (enc, 1); 270 need (enc, 1);
245 encode_ch (enc, ' '); 271 encode_ch (enc, ' ');
246} 272}
247 273
248static void 274inline void
249encode_nl (enc_t *enc) 275encode_nl (enc_t *enc)
250{ 276{
251 if (enc->flags & F_INDENT) 277 if (enc->flags & F_INDENT)
252 { 278 {
253 need (enc, 1); 279 need (enc, 1);
254 encode_ch (enc, '\n'); 280 encode_ch (enc, '\n');
255 } 281 }
256} 282}
257 283
258static void 284inline void
259encode_comma (enc_t *enc) 285encode_comma (enc_t *enc)
260{ 286{
261 encode_ch (enc, ','); 287 encode_ch (enc, ',');
262 288
263 if (enc->flags & F_INDENT) 289 if (enc->flags & F_INDENT)
… …
362 // actually, this is mostly due to the stupid so-called 388 // actually, this is mostly due to the stupid so-called
363 // security workaround added somewhere in 5.8.x. 389 // security workaround added somewhere in 5.8.x.
364 // that randomises hash orderings 390 // that randomises hash orderings
365 if (enc->flags & F_CANONICAL) 391 if (enc->flags & F_CANONICAL)
366 { 392 {
367 HE *he, *hes [count]; // if your compiler dies here, you need to enable C99 mode
368 int fast = 1; 393 int fast = 1;
394 HE *he;
395#if defined(__BORLANDC__) || defined(_MSC_VER)
396 HE **hes = _alloca (count * sizeof (HE));
397#else
398 HE *hes [count]; // if your compiler dies here, you need to enable C99 mode
399#endif
369 400
370 i = 0; 401 i = 0;
371 while ((he = hv_iternext (hv))) 402 while ((he = hv_iternext (hv)))
372 { 403 {
373 hes [i++] = he; 404 hes [i++] = he;
… …
471 encode_str (enc, str, len, SvUTF8 (sv)); 502 encode_str (enc, str, len, SvUTF8 (sv));
472 encode_ch (enc, '"'); 503 encode_ch (enc, '"');
473 } 504 }
474 else if (SvNOKp (sv)) 505 else if (SvNOKp (sv))
475 { 506 {
507 // trust that perl will do the right thing w.r.t. JSON syntax.
476 need (enc, NV_DIG + 32); 508 need (enc, NV_DIG + 32);
477 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur); 509 Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
478 enc->cur += strlen (enc->cur); 510 enc->cur += strlen (enc->cur);
479 } 511 }
480 else if (SvIOKp (sv)) 512 else if (SvIOKp (sv))
481 { 513 {
482 need (enc, 64); 514 // we assume we can always read an IV as a UV
515 if (SvUV (sv) & ~(UV)0x7fff)
516 {
517 // large integer, use the (rather slow) snprintf way.
518 need (enc, sizeof (UV) * 3);
483 enc->cur += 519 enc->cur +=
484 SvIsUV(sv) 520 SvIsUV(sv)
485 ? snprintf (enc->cur, 64, "%"UVuf, (UV)SvUVX (sv)) 521 ? snprintf (enc->cur, sizeof (UV) * 3, "%"UVuf, (UV)SvUVX (sv))
486 : snprintf (enc->cur, 64, "%"IVdf, (IV)SvIVX (sv)); 522 : snprintf (enc->cur, sizeof (UV) * 3, "%"IVdf, (IV)SvIVX (sv));
523 }
524 else
525 {
526 // optimise the "small number case"
527 // code will likely be branchless and use only a single multiplication
528 I32 i = SvIV (sv);
529 U32 u;
530 char digit, nz = 0;
531
532 need (enc, 6);
533
534 *enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
535 u = i < 0 ? -i : i;
536
537 // convert to 4.28 fixed-point representation
538 u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
539
540 // now output digit by digit, each time masking out the integer part
541 // and multiplying by 5 while moving the decimal point one to the right,
542 // resulting in a net multiplication by 10.
543 // we always write the digit to memory but conditionally increment
544 // the pointer, to ease the usage of conditional move instructions.
545 digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffff) * 5;
546 digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffff) * 5;
547 digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffff) * 5;
548 digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffff) * 5;
549 digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
550 }
487 } 551 }
488 else if (SvROK (sv)) 552 else if (SvROK (sv))
489 encode_rv (enc, SvRV (sv)); 553 encode_rv (enc, SvRV (sv));
490 else if (!SvOK (sv)) 554 else if (!SvOK (sv))
491 encode_str (enc, "null", 4, 0); 555 encode_str (enc, "null", 4, 0);
… …
510 enc.maxdepth = DEC_DEPTH (flags); 574 enc.maxdepth = DEC_DEPTH (flags);
511 575
512 SvPOK_only (enc.sv); 576 SvPOK_only (enc.sv);
513 encode_sv (&enc, scalar); 577 encode_sv (&enc, scalar);
514 578
579 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
580 *SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
581
515 if (!(flags & (F_ASCII | F_UTF8))) 582 if (!(flags & (F_ASCII | F_LATIN1 | F_UTF8)))
516 SvUTF8_on (enc.sv); 583 SvUTF8_on (enc.sv);
517
518 SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
519 584
520 if (enc.flags & F_SHRINK) 585 if (enc.flags & F_SHRINK)
521 shrink (enc.sv); 586 shrink (enc.sv);
522 587
523 return enc.sv; 588 return enc.sv;
… …
535 U32 flags; // F_* 600 U32 flags; // F_*
536 U32 depth; // recursion depth 601 U32 depth; // recursion depth
537 U32 maxdepth; // recursion depth limit 602 U32 maxdepth; // recursion depth limit
538} dec_t; 603} dec_t;
539 604
540static void 605inline void
541decode_ws (dec_t *dec) 606decode_ws (dec_t *dec)
542{ 607{
543 for (;;) 608 for (;;)
544 { 609 {
545 char ch = *dec->cur; 610 char ch = *dec->cur;
… …
571decode_4hex (dec_t *dec) 636decode_4hex (dec_t *dec)
572{ 637{
573 signed char d1, d2, d3, d4; 638 signed char d1, d2, d3, d4;
574 unsigned char *cur = (unsigned char *)dec->cur; 639 unsigned char *cur = (unsigned char *)dec->cur;
575 640
576 d1 = decode_hexdigit [cur [0]]; if (d1 < 0) ERR ("four hexadecimal digits expected"); 641 d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
577 d2 = decode_hexdigit [cur [1]]; if (d2 < 0) ERR ("four hexadecimal digits expected"); 642 d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
578 d3 = decode_hexdigit [cur [2]]; if (d3 < 0) ERR ("four hexadecimal digits expected"); 643 d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
579 d4 = decode_hexdigit [cur [3]]; if (d4 < 0) ERR ("four hexadecimal digits expected"); 644 d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
580 645
581 dec->cur += 4; 646 dec->cur += 4;
582 647
583 return ((UV)d1) << 12 648 return ((UV)d1) << 12
584 | ((UV)d2) << 8 649 | ((UV)d2) << 8
… …
592static SV * 657static SV *
593decode_str (dec_t *dec) 658decode_str (dec_t *dec)
594{ 659{
595 SV *sv = 0; 660 SV *sv = 0;
596 int utf8 = 0; 661 int utf8 = 0;
662 char *dec_cur = dec->cur;
597 663
598 do 664 do
599 { 665 {
600 char buf [SHORT_STRING_LEN + UTF8_MAX_LEN]; 666 char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
601 char *cur = buf; 667 char *cur = buf;
602 668
603 do 669 do
604 { 670 {
605 unsigned char ch = *(unsigned char *)dec->cur++; 671 unsigned char ch = *(unsigned char *)dec_cur++;
606 672
607 if (ch == '"') 673 if (expect_false (ch == '"'))
608 { 674 {
609 --dec->cur; 675 --dec_cur;
610 break; 676 break;
611 } 677 }
612 else if (ch == '\\') 678 else if (expect_false (ch == '\\'))
613 { 679 {
614 switch (*dec->cur) 680 switch (*dec_cur)
615 { 681 {
616 case '\\': 682 case '\\':
617 case '/': 683 case '/':
618 case '"': *cur++ = *dec->cur++; break; 684 case '"': *cur++ = *dec_cur++; break;
619 685
620 case 'b': ++dec->cur; *cur++ = '\010'; break; 686 case 'b': ++dec_cur; *cur++ = '\010'; break;
621 case 't': ++dec->cur; *cur++ = '\011'; break; 687 case 't': ++dec_cur; *cur++ = '\011'; break;
622 case 'n': ++dec->cur; *cur++ = '\012'; break; 688 case 'n': ++dec_cur; *cur++ = '\012'; break;
623 case 'f': ++dec->cur; *cur++ = '\014'; break; 689 case 'f': ++dec_cur; *cur++ = '\014'; break;
624 case 'r': ++dec->cur; *cur++ = '\015'; break; 690 case 'r': ++dec_cur; *cur++ = '\015'; break;
625 691
626 case 'u': 692 case 'u':
627 { 693 {
628 UV lo, hi; 694 UV lo, hi;
629 ++dec->cur; 695 ++dec_cur;
630 696
697 dec->cur = dec_cur;
631 hi = decode_4hex (dec); 698 hi = decode_4hex (dec);
699 dec_cur = dec->cur;
632 if (hi == (UV)-1) 700 if (hi == (UV)-1)
633 goto fail; 701 goto fail;
634 702
635 // possibly a surrogate pair 703 // possibly a surrogate pair
636 if (hi >= 0xd800) 704 if (hi >= 0xd800)
637 if (hi < 0xdc00) 705 if (hi < 0xdc00)
638 { 706 {
639 if (dec->cur [0] != '\\' || dec->cur [1] != 'u') 707 if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
640 ERR ("missing low surrogate character in surrogate pair"); 708 ERR ("missing low surrogate character in surrogate pair");
641 709
642 dec->cur += 2; 710 dec_cur += 2;
643 711
712 dec->cur = dec_cur;
644 lo = decode_4hex (dec); 713 lo = decode_4hex (dec);
714 dec_cur = dec->cur;
645 if (lo == (UV)-1) 715 if (lo == (UV)-1)
646 goto fail; 716 goto fail;
647 717
648 if (lo < 0xdc00 || lo >= 0xe000) 718 if (lo < 0xdc00 || lo >= 0xe000)
649 ERR ("surrogate pair expected"); 719 ERR ("surrogate pair expected");
… …
663 *cur++ = hi; 733 *cur++ = hi;
664 } 734 }
665 break; 735 break;
666 736
667 default: 737 default:
668 --dec->cur; 738 --dec_cur;
669 ERR ("illegal backslash escape sequence in string"); 739 ERR ("illegal backslash escape sequence in string");
670 } 740 }
671 } 741 }
672 else if (ch >= 0x20 && ch <= 0x7f) 742 else if (expect_true (ch >= 0x20 && ch <= 0x7f))
673 *cur++ = ch; 743 *cur++ = ch;
674 else if (ch >= 0x80) 744 else if (ch >= 0x80)
675 { 745 {
676 STRLEN clen; 746 STRLEN clen;
677 UV uch; 747 UV uch;
678 748
679 --dec->cur; 749 --dec_cur;
680 750
681 uch = decode_utf8 (dec->cur, dec->end - dec->cur, &clen); 751 uch = decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
682 if (clen == (STRLEN)-1) 752 if (clen == (STRLEN)-1)
683 ERR ("malformed UTF-8 character in JSON string"); 753 ERR ("malformed UTF-8 character in JSON string");
684 754
685 do 755 do
686 *cur++ = *dec->cur++; 756 *cur++ = *dec_cur++;
687 while (--clen); 757 while (--clen);
688 758
689 utf8 = 1; 759 utf8 = 1;
690 } 760 }
691 else 761 else
692 { 762 {
693 --dec->cur; 763 --dec_cur;
694 764
695 if (!ch) 765 if (!ch)
696 ERR ("unexpected end of string while parsing JSON string"); 766 ERR ("unexpected end of string while parsing JSON string");
697 else 767 else
698 ERR ("invalid character encountered while parsing JSON string"); 768 ERR ("invalid character encountered while parsing JSON string");
… …
711 } 781 }
712 else 782 else
713 sv = newSVpvn (buf, len); 783 sv = newSVpvn (buf, len);
714 } 784 }
715 } 785 }
716 while (*dec->cur != '"'); 786 while (*dec_cur != '"');
717 787
718 ++dec->cur; 788 ++dec_cur;
719 789
720 if (sv) 790 if (sv)
721 { 791 {
722 SvPOK_only (sv); 792 SvPOK_only (sv);
723 *SvEND (sv) = 0; 793 *SvEND (sv) = 0;
… …
726 SvUTF8_on (sv); 796 SvUTF8_on (sv);
727 } 797 }
728 else 798 else
729 sv = newSVpvn ("", 0); 799 sv = newSVpvn ("", 0);
730 800
801 dec->cur = dec_cur;
731 return sv; 802 return sv;
732 803
733fail: 804fail:
805 dec->cur = dec_cur;
734 return 0; 806 return 0;
735} 807}
736 808
737static SV * 809static SV *
738decode_num (dec_t *dec) 810decode_num (dec_t *dec)
… …
796 is_nv = 1; 868 is_nv = 1;
797 } 869 }
798 870
799 if (!is_nv) 871 if (!is_nv)
800 { 872 {
801 UV uv; 873 // special case the rather common 1..4-digit-int case, assumes 32 bit ints or so
802 int numtype = grok_number (start, dec->cur - start, &uv); 874 if (*start == '-')
803 if (numtype & IS_NUMBER_IN_UV) 875 switch (dec->cur - start)
804 if (numtype & IS_NUMBER_NEG)
805 { 876 {
806 if (uv < (UV)IV_MIN) 877 case 2: return newSViv (-( start [1] - '0' * 1));
807 return newSViv (-(IV)uv); 878 case 3: return newSViv (-( start [1] * 10 + start [2] - '0' * 11));
879 case 4: return newSViv (-( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
880 case 5: return newSViv (-(start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
808 } 881 }
882 else
883 switch (dec->cur - start)
884 {
885 case 1: return newSViv ( start [0] - '0' * 1);
886 case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
887 case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
888 case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
889 }
890
891 {
892 UV uv;
893 int numtype = grok_number (start, dec->cur - start, &uv);
894 if (numtype & IS_NUMBER_IN_UV)
895 if (numtype & IS_NUMBER_NEG)
896 {
897 if (uv < (UV)IV_MIN)
898 return newSViv (-(IV)uv);
899 }
809 else 900 else
810 return newSVuv (uv); 901 return newSVuv (uv);
902
903 // here would likely be the place for bigint support
811 } 904 }
905 }
812 906
907 // if we ever support bigint or bigfloat, this is the place for bigfloat
813 return newSVnv (Atof (start)); 908 return newSVnv (Atof (start));
814 909
815fail: 910fail:
816 return 0; 911 return 0;
817} 912}
… …
918 1013
919static SV * 1014static SV *
920decode_sv (dec_t *dec) 1015decode_sv (dec_t *dec)
921{ 1016{
922 decode_ws (dec); 1017 decode_ws (dec);
1018
1019 // the beauty of JSON: you need exactly one character lookahead
1020 // to parse anything.
923 switch (*dec->cur) 1021 switch (*dec->cur)
924 { 1022 {
925 case '"': ++dec->cur; return decode_str (dec); 1023 case '"': ++dec->cur; return decode_str (dec);
926 case '[': ++dec->cur; return decode_av (dec); 1024 case '[': ++dec->cur; return decode_av (dec);
927 case '{': ++dec->cur; return decode_hv (dec); 1025 case '{': ++dec->cur; return decode_hv (dec);
… …
972fail: 1070fail:
973 return 0; 1071 return 0;
974} 1072}
975 1073
976static SV * 1074static SV *
977decode_json (SV *string, U32 flags) 1075decode_json (SV *string, U32 flags, UV *offset_return)
978{ 1076{
979 dec_t dec; 1077 dec_t dec;
1078 UV offset;
980 SV *sv; 1079 SV *sv;
981 1080
1081 SvGETMAGIC (string);
982 SvUPGRADE (string, SVt_PV); 1082 SvUPGRADE (string, SVt_PV);
983 1083
984 if (flags & F_UTF8) 1084 if (flags & F_UTF8)
985 sv_utf8_downgrade (string, 0); 1085 sv_utf8_downgrade (string, 0);
986 else 1086 else
… …
993 dec.end = SvEND (string); 1093 dec.end = SvEND (string);
994 dec.err = 0; 1094 dec.err = 0;
995 dec.depth = 0; 1095 dec.depth = 0;
996 dec.maxdepth = DEC_DEPTH (dec.flags); 1096 dec.maxdepth = DEC_DEPTH (dec.flags);
997 1097
998 *dec.end = 0; // this should basically be a nop, too, but make sure its there 1098 *dec.end = 0; // this should basically be a nop, too, but make sure it's there
999 sv = decode_sv (&dec); 1099 sv = decode_sv (&dec);
1000 1100
1101 if (!(offset_return || !sv))
1102 {
1103 // check for trailing garbage
1104 decode_ws (&dec);
1105
1106 if (*dec.cur)
1107 {
1108 dec.err = "garbage after JSON object";
1109 SvREFCNT_dec (sv);
1110 sv = 0;
1111 }
1112 }
1113
1114 if (offset_return || !sv)
1115 {
1116 offset = dec.flags & F_UTF8
1117 ? dec.cur - SvPVX (string)
1118 : utf8_distance (dec.cur, SvPVX (string));
1119
1120 if (offset_return)
1121 *offset_return = offset;
1122 }
1123
1001 if (!sv) 1124 if (!sv)
1002 { 1125 {
1003 IV offset = dec.flags & F_UTF8
1004 ? dec.cur - SvPVX (string)
1005 : utf8_distance (dec.cur, SvPVX (string));
1006 SV *uni = sv_newmortal (); 1126 SV *uni = sv_newmortal ();
1007 1127
1008 // horrible hack to silence warning inside pv_uni_display 1128 // horrible hack to silence warning inside pv_uni_display
1009 COP cop = *PL_curcop; 1129 COP cop = *PL_curcop;
1010 cop.cop_warnings = pWARN_NONE; 1130 cop.cop_warnings = pWARN_NONE;
… …
1035 1155
1036BOOT: 1156BOOT:
1037{ 1157{
1038 int i; 1158 int i;
1039 1159
1040 memset (decode_hexdigit, 0xff, 256);
1041
1042 for (i = 0; i < 256; ++i) 1160 for (i = 0; i < 256; ++i)
1043 decode_hexdigit [i] = 1161 decode_hexdigit [i] =
1044 i >= '0' && i <= '9' ? i - '0' 1162 i >= '0' && i <= '9' ? i - '0'
1045 : i >= 'a' && i <= 'f' ? i - 'a' + 10 1163 : i >= 'a' && i <= 'f' ? i - 'a' + 10
1046 : i >= 'A' && i <= 'F' ? i - 'A' + 10 1164 : i >= 'A' && i <= 'F' ? i - 'A' + 10
… …
1058 RETVAL 1176 RETVAL
1059 1177
1060SV *ascii (SV *self, int enable = 1) 1178SV *ascii (SV *self, int enable = 1)
1061 ALIAS: 1179 ALIAS:
1062 ascii = F_ASCII 1180 ascii = F_ASCII
1181 latin1 = F_LATIN1
1063 utf8 = F_UTF8 1182 utf8 = F_UTF8
1064 indent = F_INDENT 1183 indent = F_INDENT
1065 canonical = F_CANONICAL 1184 canonical = F_CANONICAL
1066 space_before = F_SPACE_BEFORE 1185 space_before = F_SPACE_BEFORE
1067 space_after = F_SPACE_AFTER 1186 space_after = F_SPACE_AFTER
… …
1103 PPCODE: 1222 PPCODE:
1104 XPUSHs (encode_json (scalar, *SvJSON (self))); 1223 XPUSHs (encode_json (scalar, *SvJSON (self)));
1105 1224
1106void decode (SV *self, SV *jsonstr) 1225void decode (SV *self, SV *jsonstr)
1107 PPCODE: 1226 PPCODE:
1108 XPUSHs (decode_json (jsonstr, *SvJSON (self))); 1227 XPUSHs (decode_json (jsonstr, *SvJSON (self), 0));
1228
1229void decode_prefix (SV *self, SV *jsonstr)
1230 PPCODE:
1231{
1232 UV offset;
1233 EXTEND (SP, 2);
1234 PUSHs (decode_json (jsonstr, *SvJSON (self), &offset));
1235 PUSHs (sv_2mortal (newSVuv (offset)));
1236}
1109 1237
1110PROTOTYPES: ENABLE 1238PROTOTYPES: ENABLE
1111 1239
1112void to_json (SV *scalar) 1240void to_json (SV *scalar)
1113 ALIAS: 1241 ALIAS:
… …
1117 1245
1118void from_json (SV *jsonstr) 1246void from_json (SV *jsonstr)
1119 ALIAS: 1247 ALIAS:
1120 jsonToObj = 0 1248 jsonToObj = 0
1121 PPCODE: 1249 PPCODE:
1122 XPUSHs (decode_json (jsonstr, F_DEFAULT | F_UTF8)); 1250 XPUSHs (decode_json (jsonstr, F_DEFAULT | F_UTF8, 0));
1123 1251

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