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#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <limits.h>
#include <float.h>
#include <inttypes.h>
#if defined(__BORLANDC__) || defined(_MSC_VER)
# define snprintf _snprintf // C compilers have this in stdio.h
#endif
// some old perls do not have this, try to make it work, no
// guarantees, though. if it breaks, you get to keep the pieces.
#ifndef UTF8_MAXBYTES
# define UTF8_MAXBYTES 13
#endif
// compatibility with perl <5.18
#ifndef HvNAMELEN_get
# define HvNAMELEN_get(hv) strlen (HvNAME (hv))
#endif
#ifndef HvNAMELEN
# define HvNAMELEN(hv) HvNAMELEN_get (hv)
#endif
#ifndef HvNAMEUTF8
# define HvNAMEUTF8(hv) 0
#endif
// three extra for rounding, sign, and end of string
#define IVUV_MAXCHARS (sizeof (UV) * CHAR_BIT * 28 / 93 + 3)
#define F_ASCII 0x00000001UL
#define F_LATIN1 0x00000002UL
#define F_UTF8 0x00000004UL
#define F_INDENT 0x00000008UL
#define F_CANONICAL 0x00000010UL
#define F_SPACE_BEFORE 0x00000020UL
#define F_SPACE_AFTER 0x00000040UL
#define F_ALLOW_NONREF 0x00000100UL
#define F_SHRINK 0x00000200UL
#define F_ALLOW_BLESSED 0x00000400UL
#define F_CONV_BLESSED 0x00000800UL
#define F_RELAXED 0x00001000UL
#define F_ALLOW_UNKNOWN 0x00002000UL
#define F_ALLOW_TAGS 0x00004000UL
#define F_HOOK 0x00080000UL // some hooks exist, so slow-path processing
#define F_PRETTY F_INDENT | F_SPACE_BEFORE | F_SPACE_AFTER
#define INIT_SIZE 64 // initial scalar size to be allocated
#define INDENT_STEP 3 // spaces per indentation level
#define SHORT_STRING_LEN 16384 // special-case strings of up to this size
#define DECODE_WANTS_OCTETS(json) ((json)->flags & F_UTF8)
#define SB do {
#define SE } while (0)
#if __GNUC__ >= 3
# define expect(expr,value) __builtin_expect ((expr), (value))
# define INLINE static inline
#else
# define expect(expr,value) (expr)
# define INLINE static
#endif
#define expect_false(expr) expect ((expr) != 0, 0)
#define expect_true(expr) expect ((expr) != 0, 1)
#define IN_RANGE_INC(type,val,beg,end) \
((unsigned type)((unsigned type)(val) - (unsigned type)(beg)) \
<= (unsigned type)((unsigned type)(end) - (unsigned type)(beg)))
#define ERR_NESTING_EXCEEDED "json text or perl structure exceeds maximum nesting level (max_depth set too low?)"
#ifdef USE_ITHREADS
# define JSON_STASH (expect_true (json_stash) ? json_stash : gv_stashpv ("JSON::XS", 1))
# define BOOL_STASH (expect_true (bool_stash) ? bool_stash : gv_stashpv ("Types::Serialiser::Boolean", 1))
# define GET_BOOL(value) (expect_true (bool_ ## value) ? bool_ ## value : get_bool ("Types::Serialiser::" # value))
#else
# define JSON_STASH json_stash
# define BOOL_STASH bool_stash
# define GET_BOOL(value) bool_ ## value
#endif
// the amount of HEs to allocate on the stack, when sorting keys
#define STACK_HES 64
static HV *json_stash, *bool_stash; // JSON::XS::, Types::Serialiser::Boolean::
static SV *bool_false, *bool_true;
static SV *sv_json;
enum {
INCR_M_WS = 0, // initial whitespace skipping, must be 0
INCR_M_TFN, // inside true/false/null
INCR_M_NUM, // inside number
INCR_M_STR, // inside string
INCR_M_BS, // inside backslash
INCR_M_C0, // inside comment in initial whitespace sequence
INCR_M_C1, // inside comment in other places
INCR_M_JSON // outside anything, count nesting
};
#define INCR_DONE(json) ((json)->incr_nest <= 0 && (json)->incr_mode == INCR_M_JSON)
typedef struct {
U32 flags;
U32 max_depth;
STRLEN max_size;
SV *cb_object;
HV *cb_sk_object;
// for the incremental parser
SV *incr_text; // the source text so far
STRLEN incr_pos; // the current offset into the text
int incr_nest; // {[]}-nesting level
unsigned char incr_mode;
SV *v_false, *v_true;
} JSON;
INLINE void
json_init (JSON *json)
{
static const JSON init = { F_ALLOW_NONREF, 512 };
*json = init;
}
/////////////////////////////////////////////////////////////////////////////
// utility functions
INLINE SV *
get_bool (const char *name)
{
SV *sv = get_sv (name, 1);
SvREADONLY_on (sv);
SvREADONLY_on (SvRV (sv));
return sv;
}
INLINE void
shrink (SV *sv)
{
sv_utf8_downgrade (sv, 1);
if (SvLEN (sv) > SvCUR (sv) + 1)
{
#ifdef SvPV_shrink_to_cur
SvPV_shrink_to_cur (sv);
#elif defined (SvPV_renew)
SvPV_renew (sv, SvCUR (sv) + 1);
#endif
}
}
/* adds two STRLENs together, slow, and with paranoia */
static STRLEN
strlen_sum (STRLEN l1, STRLEN l2)
{
size_t sum = l1 + l2;
if (sum < (size_t)l2 || sum != (size_t)(STRLEN)sum)
croak ("JSON::XS: string size overflow");
return sum;
}
/* similar to SvGROW, but somewhat safer and guarantees exponential realloc strategy */
static char *
json_sv_grow (SV *sv, size_t len1, size_t len2)
{
len1 = strlen_sum (len1, len2);
len1 = strlen_sum (len1, len1 >> 1);
if (len1 > 4096 - 24)
len1 = (len1 | 4095) - 24;
return SvGROW (sv, len1);
}
// decode a utf-8 character and return it, or (UV)-1 in
// case of an error.
// we special-case "safe" characters from U+80 .. U+7FF,
// but use the very good perl function to parse anything else.
// note that we never call this function for a ascii codepoints
INLINE UV
decode_utf8 (unsigned char *s, STRLEN len, STRLEN *clen)
{
if (expect_true (len >= 2
&& IN_RANGE_INC (char, s[0], 0xc2, 0xdf)
&& IN_RANGE_INC (char, s[1], 0x80, 0xbf)))
{
*clen = 2;
return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
}
else
return utf8n_to_uvuni (s, len, clen, UTF8_CHECK_ONLY);
}
// likewise for encoding, also never called for ascii codepoints
// this function takes advantage of this fact, although current gccs
// seem to optimise the check for >= 0x80 away anyways
INLINE unsigned char *
encode_utf8 (unsigned char *s, UV ch)
{
if (expect_false (ch < 0x000080))
*s++ = ch;
else if (expect_true (ch < 0x000800))
*s++ = 0xc0 | ( ch >> 6),
*s++ = 0x80 | ( ch & 0x3f);
else if ( ch < 0x010000)
*s++ = 0xe0 | ( ch >> 12),
*s++ = 0x80 | ((ch >> 6) & 0x3f),
*s++ = 0x80 | ( ch & 0x3f);
else if ( ch < 0x110000)
*s++ = 0xf0 | ( ch >> 18),
*s++ = 0x80 | ((ch >> 12) & 0x3f),
*s++ = 0x80 | ((ch >> 6) & 0x3f),
*s++ = 0x80 | ( ch & 0x3f);
return s;
}
// convert offset pointer to character index, sv must be string
static STRLEN
ptr_to_index (SV *sv, char *offset)
{
return SvUTF8 (sv)
? utf8_distance (offset, SvPVX (sv))
: offset - SvPVX (sv);
}
/////////////////////////////////////////////////////////////////////////////
// fp hell
// scan a group of digits, and a trailing exponent
static void
json_atof_scan1 (const char *s, NV *accum, int *expo, int postdp, int maxdepth)
{
UV uaccum = 0;
int eaccum = 0;
// if we recurse too deep, skip all remaining digits
// to avoid a stack overflow attack
if (expect_false (--maxdepth <= 0))
while (((U8)*s - '0') < 10)
++s;
for (;;)
{
U8 dig = (U8)*s - '0';
if (expect_false (dig >= 10))
{
if (dig == (U8)((U8)'.' - (U8)'0'))
{
++s;
json_atof_scan1 (s, accum, expo, 1, maxdepth);
}
else if ((dig | ' ') == 'e' - '0')
{
int exp2 = 0;
int neg = 0;
++s;
if (*s == '-')
{
++s;
neg = 1;
}
else if (*s == '+')
++s;
while ((dig = (U8)*s - '0') < 10)
exp2 = exp2 * 10 + *s++ - '0';
*expo += neg ? -exp2 : exp2;
}
break;
}
++s;
uaccum = uaccum * 10 + dig;
++eaccum;
// if we have too many digits, then recurse for more
// we actually do this for rather few digits
if (uaccum >= (UV_MAX - 9) / 10)
{
if (postdp) *expo -= eaccum;
json_atof_scan1 (s, accum, expo, postdp, maxdepth);
if (postdp) *expo += eaccum;
break;
}
}
// this relies greatly on the quality of the pow ()
// implementation of the platform, but a good
// implementation is hard to beat.
// (IEEE 754 conformant ones are required to be exact)
if (postdp) *expo -= eaccum;
*accum += uaccum * Perl_pow (10., *expo);
*expo += eaccum;
}
static NV
json_atof (const char *s)
{
NV accum = 0.;
int expo = 0;
int neg = 0;
if (*s == '-')
{
++s;
neg = 1;
}
// a recursion depth of ten gives us >>500 bits
json_atof_scan1 (s, &accum, &expo, 0, 10);
return neg ? -accum : accum;
}
// target of scalar reference is bool? -1 == nope, 0 == false, 1 == true
static int
ref_bool_type (SV *sv)
{
svtype svt = SvTYPE (sv);
if (svt < SVt_PVAV)
{
STRLEN len = 0;
char *pv = svt ? SvPV (sv, len) : 0;
if (len == 1)
if (*pv == '1')
return 1;
else if (*pv == '0')
return 0;
}
return -1;
}
// returns whether scalar is not a reference in the sense of allow_nonref
static int
json_nonref (SV *scalar)
{
if (!SvROK (scalar))
return 1;
scalar = SvRV (scalar);
if (SvTYPE (scalar) >= SVt_PVMG)
{
if (SvSTASH (scalar) == bool_stash)
return 1;
if (!SvOBJECT (scalar) && ref_bool_type (scalar) >= 0)
return 1;
}
return 0;
}
/////////////////////////////////////////////////////////////////////////////
// encoder
// structure used for encoding JSON
typedef struct
{
char *cur; // SvPVX (sv) + current output position
char *end; // SvEND (sv)
SV *sv; // result scalar
JSON json;
U32 indent; // indentation level
UV limit; // escape character values >= this value when encoding
} enc_t;
INLINE void
need (enc_t *enc, STRLEN len)
{
if (expect_false ((uintptr_t)(enc->end - enc->cur) < len))
{
STRLEN cur = enc->cur - (char *)SvPVX (enc->sv);
char *buf = json_sv_grow (enc->sv, cur, len);
enc->cur = buf + cur;
enc->end = buf + SvLEN (enc->sv) - 1;
}
}
INLINE void
encode_ch (enc_t *enc, char ch)
{
need (enc, 1);
*enc->cur++ = ch;
}
static void
encode_str (enc_t *enc, char *str, STRLEN len, int is_utf8)
{
char *end = str + len;
need (enc, len);
while (str < end)
{
unsigned char ch = *(unsigned char *)str;
if (expect_true (ch >= 0x20 && ch < 0x80)) // most common case
{
if (expect_false (ch == '"')) // but with slow exceptions
{
need (enc, len + 1);
*enc->cur++ = '\\';
*enc->cur++ = '"';
}
else if (expect_false (ch == '\\'))
{
need (enc, len + 1);
*enc->cur++ = '\\';
*enc->cur++ = '\\';
}
else
*enc->cur++ = ch;
++str;
}
else
{
switch (ch)
{
case '\010': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 'b'; ++str; break;
case '\011': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 't'; ++str; break;
case '\012': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 'n'; ++str; break;
case '\014': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 'f'; ++str; break;
case '\015': need (enc, len + 1); *enc->cur++ = '\\'; *enc->cur++ = 'r'; ++str; break;
default:
{
STRLEN clen;
UV uch;
if (is_utf8)
{
uch = decode_utf8 (str, end - str, &clen);
if (clen == (STRLEN)-1)
croak ("malformed or illegal unicode character in string [%.11s], cannot convert to JSON", str);
}
else
{
uch = ch;
clen = 1;
}
if (uch < 0x80/*0x20*/ || uch >= enc->limit)
{
if (uch >= 0x10000UL)
{
if (uch >= 0x110000UL)
croak ("out of range codepoint (0x%lx) encountered, unrepresentable in JSON", (unsigned long)uch);
need (enc, len + 11);
sprintf (enc->cur, "\\u%04x\\u%04x",
(int)((uch - 0x10000) / 0x400 + 0xD800),
(int)((uch - 0x10000) % 0x400 + 0xDC00));
enc->cur += 12;
}
else
{
need (enc, len + 5);
*enc->cur++ = '\\';
*enc->cur++ = 'u';
*enc->cur++ = PL_hexdigit [ uch >> 12 ];
*enc->cur++ = PL_hexdigit [(uch >> 8) & 15];
*enc->cur++ = PL_hexdigit [(uch >> 4) & 15];
*enc->cur++ = PL_hexdigit [(uch >> 0) & 15];
}
str += clen;
}
else if (enc->json.flags & F_LATIN1)
{
*enc->cur++ = uch;
str += clen;
}
else if (is_utf8)
{
need (enc, len + clen);
do
{
*enc->cur++ = *str++;
}
while (--clen);
}
else
{
need (enc, len + UTF8_MAXBYTES - 1); // never more than 11 bytes needed
enc->cur = encode_utf8 (enc->cur, uch);
++str;
}
}
}
}
--len;
}
}
INLINE void
encode_indent (enc_t *enc)
{
if (enc->json.flags & F_INDENT)
{
int spaces = enc->indent * INDENT_STEP;
need (enc, spaces);
memset (enc->cur, ' ', spaces);
enc->cur += spaces;
}
}
INLINE void
encode_space (enc_t *enc)
{
need (enc, 1);
encode_ch (enc, ' ');
}
INLINE void
encode_nl (enc_t *enc)
{
if (enc->json.flags & F_INDENT)
{
need (enc, 1);
encode_ch (enc, '\n');
}
}
INLINE void
encode_comma (enc_t *enc)
{
encode_ch (enc, ',');
if (enc->json.flags & F_INDENT)
encode_nl (enc);
else if (enc->json.flags & F_SPACE_AFTER)
encode_space (enc);
}
static void encode_sv (enc_t *enc, SV *sv);
static void
encode_av (enc_t *enc, AV *av)
{
int i, len = av_len (av);
if (enc->indent >= enc->json.max_depth)
croak (ERR_NESTING_EXCEEDED);
encode_ch (enc, '[');
if (len >= 0)
{
encode_nl (enc); ++enc->indent;
for (i = 0; i <= len; ++i)
{
SV **svp = av_fetch (av, i, 0);
encode_indent (enc);
if (svp)
encode_sv (enc, *svp);
else
encode_str (enc, "null", 4, 0);
if (i < len)
encode_comma (enc);
}
encode_nl (enc); --enc->indent; encode_indent (enc);
}
encode_ch (enc, ']');
}
static void
encode_hk (enc_t *enc, HE *he)
{
encode_ch (enc, '"');
if (HeKLEN (he) == HEf_SVKEY)
{
SV *sv = HeSVKEY (he);
STRLEN len;
char *str;
SvGETMAGIC (sv);
str = SvPV (sv, len);
encode_str (enc, str, len, SvUTF8 (sv));
}
else
encode_str (enc, HeKEY (he), HeKLEN (he), HeKUTF8 (he));
encode_ch (enc, '"');
if (enc->json.flags & F_SPACE_BEFORE) encode_space (enc);
encode_ch (enc, ':');
if (enc->json.flags & F_SPACE_AFTER ) encode_space (enc);
}
// compare hash entries, used when all keys are bytestrings
static int
he_cmp_fast (const void *a_, const void *b_)
{
int cmp;
HE *a = *(HE **)a_;
HE *b = *(HE **)b_;
STRLEN la = HeKLEN (a);
STRLEN lb = HeKLEN (b);
if (!(cmp = memcmp (HeKEY (b), HeKEY (a), lb < la ? lb : la)))
cmp = lb - la;
return cmp;
}
// compare hash entries, used when some keys are sv's or utf-x
static int
he_cmp_slow (const void *a, const void *b)
{
return sv_cmp (HeSVKEY_force (*(HE **)b), HeSVKEY_force (*(HE **)a));
}
static void
encode_hv (enc_t *enc, HV *hv)
{
HE *he;
if (enc->indent >= enc->json.max_depth)
croak (ERR_NESTING_EXCEEDED);
encode_ch (enc, '{');
// for canonical output we have to sort by keys first
// actually, this is mostly due to the stupid so-called
// security workaround added somewhere in 5.8.x
// that randomises hash orderings
if (enc->json.flags & F_CANONICAL && !SvRMAGICAL (hv))
{
int count = hv_iterinit (hv);
if (SvMAGICAL (hv))
{
// need to count by iterating. could improve by dynamically building the vector below
// but I don't care for the speed of this special case.
// note also that we will run into undefined behaviour when the two iterations
// do not result in the same count, something I might care for in some later release.
count = 0;
while (hv_iternext (hv))
++count;
hv_iterinit (hv);
}
if (count)
{
int i, fast = 1;
HE *hes_stack [STACK_HES];
HE **hes = hes_stack;
// allocate larger arrays on the heap
if (count > STACK_HES)
{
SV *sv = sv_2mortal (NEWSV (0, count * sizeof (*hes)));
hes = (HE **)SvPVX (sv);
}
i = 0;
while ((he = hv_iternext (hv)))
{
hes [i++] = he;
if (HeKLEN (he) < 0 || HeKUTF8 (he))
fast = 0;
}
assert (i == count);
if (fast)
qsort (hes, count, sizeof (HE *), he_cmp_fast);
else
{
// hack to forcefully disable "use bytes"
COP cop = *PL_curcop;
cop.op_private = 0;
ENTER;
SAVETMPS;
SAVEVPTR (PL_curcop);
PL_curcop = &cop;
qsort (hes, count, sizeof (HE *), he_cmp_slow);
FREETMPS;
LEAVE;
}
encode_nl (enc); ++enc->indent;
while (count--)
{
encode_indent (enc);
he = hes [count];
encode_hk (enc, he);
encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
if (count)
encode_comma (enc);
}
encode_nl (enc); --enc->indent; encode_indent (enc);
}
}
else
{
if (hv_iterinit (hv) || SvMAGICAL (hv))
if ((he = hv_iternext (hv)))
{
encode_nl (enc); ++enc->indent;
for (;;)
{
encode_indent (enc);
encode_hk (enc, he);
encode_sv (enc, expect_false (SvMAGICAL (hv)) ? hv_iterval (hv, he) : HeVAL (he));
if (!(he = hv_iternext (hv)))
break;
encode_comma (enc);
}
encode_nl (enc); --enc->indent; encode_indent (enc);
}
}
encode_ch (enc, '}');
}
// encode objects, arrays and special \0=false and \1=true values.
static void
encode_rv (enc_t *enc, SV *sv)
{
svtype svt;
GV *method;
SvGETMAGIC (sv);
svt = SvTYPE (sv);
if (expect_false (SvOBJECT (sv)))
{
HV *stash = SvSTASH (sv);
if (stash == bool_stash)
{
if (SvIV (sv)) encode_str (enc, "true" , 4, 0);
else encode_str (enc, "false", 5, 0);
}
else if ((enc->json.flags & F_ALLOW_TAGS) && (method = gv_fetchmethod_autoload (stash, "FREEZE", 0)))
{
int count;
dSP;
ENTER; SAVETMPS;
PUSHMARK (SP);
EXTEND (SP, 2);
// we re-bless the reference to get overload and other niceties right
PUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), stash));
PUSHs (sv_json);
PUTBACK;
count = call_sv ((SV *)GvCV (method), G_ARRAY);
SPAGAIN;
// catch this surprisingly common error
if (SvROK (TOPs) && SvRV (TOPs) == sv)
croak ("%s::FREEZE method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
encode_ch (enc, '(');
encode_ch (enc, '"');
encode_str (enc, HvNAME (stash), HvNAMELEN (stash), HvNAMEUTF8 (stash));
encode_ch (enc, '"');
encode_ch (enc, ')');
encode_ch (enc, '[');
if (count)
{
int i;
for (i = 0; i < count - 1; ++i)
{
encode_sv (enc, SP[i + 1 - count]);
encode_ch (enc, ',');
}
encode_sv (enc, TOPs);
SP -= count;
}
PUTBACK;
encode_ch (enc, ']');
FREETMPS; LEAVE;
}
else if ((enc->json.flags & F_CONV_BLESSED) && (method = gv_fetchmethod_autoload (stash, "TO_JSON", 0)))
{
dSP;
ENTER; SAVETMPS;
PUSHMARK (SP);
// we re-bless the reference to get overload and other niceties right
XPUSHs (sv_bless (sv_2mortal (newRV_inc (sv)), stash));
// calling with G_SCALAR ensures that we always get a 1 return value
PUTBACK;
call_sv ((SV *)GvCV (method), G_SCALAR);
SPAGAIN;
// catch this surprisingly common error
if (SvROK (TOPs) && SvRV (TOPs) == sv)
croak ("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME (SvSTASH (sv)));
sv = POPs;
PUTBACK;
encode_sv (enc, sv);
FREETMPS; LEAVE;
}
else if (enc->json.flags & F_ALLOW_BLESSED)
encode_str (enc, "null", 4, 0);
else
croak ("encountered object '%s', but neither allow_blessed, convert_blessed nor allow_tags settings are enabled (or TO_JSON/FREEZE method missing)",
SvPV_nolen (sv_2mortal (newRV_inc (sv))));
}
else if (svt == SVt_PVHV)
encode_hv (enc, (HV *)sv);
else if (svt == SVt_PVAV)
encode_av (enc, (AV *)sv);
else if (svt < SVt_PVAV)
{
int bool_type = ref_bool_type (sv);
if (bool_type == 1)
encode_str (enc, "true", 4, 0);
else if (bool_type == 0)
encode_str (enc, "false", 5, 0);
else if (enc->json.flags & F_ALLOW_UNKNOWN)
encode_str (enc, "null", 4, 0);
else
croak ("cannot encode reference to scalar '%s' unless the scalar is 0 or 1",
SvPV_nolen (sv_2mortal (newRV_inc (sv))));
}
else if (enc->json.flags & F_ALLOW_UNKNOWN)
encode_str (enc, "null", 4, 0);
else
croak ("encountered %s, but JSON can only represent references to arrays or hashes",
SvPV_nolen (sv_2mortal (newRV_inc (sv))));
}
static void
encode_sv (enc_t *enc, SV *sv)
{
SvGETMAGIC (sv);
if (SvPOKp (sv))
{
STRLEN len;
char *str = SvPV (sv, len);
encode_ch (enc, '"');
encode_str (enc, str, len, SvUTF8 (sv));
encode_ch (enc, '"');
}
else if (SvNOKp (sv))
{
// trust that perl will do the right thing w.r.t. JSON syntax.
need (enc, NV_DIG + 32);
Gconvert (SvNVX (sv), NV_DIG, 0, enc->cur);
enc->cur += strlen (enc->cur);
}
else if (SvIOKp (sv))
{
// we assume we can always read an IV as a UV and vice versa
// we assume two's complement
// we assume no aliasing issues in the union
if (SvIsUV (sv) ? SvUVX (sv) <= 59000
: SvIVX (sv) <= 59000 && SvIVX (sv) >= -59000)
{
// optimise the "small number case"
// code will likely be branchless and use only a single multiplication
// works for numbers up to 59074
I32 i = SvIVX (sv);
U32 u;
char digit, nz = 0;
need (enc, 6);
*enc->cur = '-'; enc->cur += i < 0 ? 1 : 0;
u = i < 0 ? -i : i;
// convert to 4.28 fixed-point representation
u = u * ((0xfffffff + 10000) / 10000); // 10**5, 5 fractional digits
// now output digit by digit, each time masking out the integer part
// and multiplying by 5 while moving the decimal point one to the right,
// resulting in a net multiplication by 10.
// we always write the digit to memory but conditionally increment
// the pointer, to enable the use of conditional move instructions.
digit = u >> 28; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0xfffffffUL) * 5;
digit = u >> 27; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x7ffffffUL) * 5;
digit = u >> 26; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x3ffffffUL) * 5;
digit = u >> 25; *enc->cur = digit + '0'; enc->cur += (nz = nz || digit); u = (u & 0x1ffffffUL) * 5;
digit = u >> 24; *enc->cur = digit + '0'; enc->cur += 1; // correctly generate '0'
}
else
{
// large integer, use the (rather slow) snprintf way.
need (enc, IVUV_MAXCHARS);
enc->cur +=
SvIsUV(sv)
? snprintf (enc->cur, IVUV_MAXCHARS, "%"UVuf, (UV)SvUVX (sv))
: snprintf (enc->cur, IVUV_MAXCHARS, "%"IVdf, (IV)SvIVX (sv));
}
}
else if (SvROK (sv))
encode_rv (enc, SvRV (sv));
else if (!SvOK (sv) || enc->json.flags & F_ALLOW_UNKNOWN)
encode_str (enc, "null", 4, 0);
else
croak ("encountered perl type (%s,0x%x) that JSON cannot handle, check your input data",
SvPV_nolen (sv), (unsigned int)SvFLAGS (sv));
}
static SV *
encode_json (SV *scalar, JSON *json)
{
enc_t enc;
if (!(json->flags & F_ALLOW_NONREF) && json_nonref (scalar))
croak ("hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)");
enc.json = *json;
enc.sv = sv_2mortal (NEWSV (0, INIT_SIZE));
enc.cur = SvPVX (enc.sv);
enc.end = SvEND (enc.sv);
enc.indent = 0;
enc.limit = enc.json.flags & F_ASCII ? 0x000080UL
: enc.json.flags & F_LATIN1 ? 0x000100UL
: 0x110000UL;
SvPOK_only (enc.sv);
encode_sv (&enc, scalar);
encode_nl (&enc);
SvCUR_set (enc.sv, enc.cur - SvPVX (enc.sv));
*SvEND (enc.sv) = 0; // many xs functions expect a trailing 0 for text strings
if (!(enc.json.flags & (F_ASCII | F_LATIN1 | F_UTF8)))
SvUTF8_on (enc.sv);
if (enc.json.flags & F_SHRINK)
shrink (enc.sv);
return enc.sv;
}
/////////////////////////////////////////////////////////////////////////////
// decoder
// structure used for decoding JSON
typedef struct
{
char *cur; // current parser pointer
char *end; // end of input string
const char *err; // parse error, if != 0
JSON json;
U32 depth; // recursion depth
U32 maxdepth; // recursion depth limit
} dec_t;
INLINE void
decode_comment (dec_t *dec)
{
// only '#'-style comments allowed a.t.m.
while (*dec->cur && *dec->cur != 0x0a && *dec->cur != 0x0d)
++dec->cur;
}
INLINE void
decode_ws (dec_t *dec)
{
for (;;)
{
char ch = *dec->cur;
if (ch > 0x20)
{
if (expect_false (ch == '#'))
{
if (dec->json.flags & F_RELAXED)
decode_comment (dec);
else
break;
}
else
break;
}
else if (ch != 0x20 && ch != 0x0a && ch != 0x0d && ch != 0x09)
break; // parse error, but let higher level handle it, gives better error messages
else
++dec->cur;
}
}
#define ERR(reason) SB dec->err = reason; goto fail; SE
#define EXPECT_CH(ch) SB \
if (*dec->cur != ch) \
ERR (# ch " expected"); \
++dec->cur; \
SE
#define DEC_INC_DEPTH if (++dec->depth > dec->json.max_depth) ERR (ERR_NESTING_EXCEEDED)
#define DEC_DEC_DEPTH --dec->depth
static SV *decode_sv (dec_t *dec);
static signed char decode_hexdigit[256];
static UV
decode_4hex (dec_t *dec)
{
signed char d1, d2, d3, d4;
unsigned char *cur = (unsigned char *)dec->cur;
d1 = decode_hexdigit [cur [0]]; if (expect_false (d1 < 0)) ERR ("exactly four hexadecimal digits expected");
d2 = decode_hexdigit [cur [1]]; if (expect_false (d2 < 0)) ERR ("exactly four hexadecimal digits expected");
d3 = decode_hexdigit [cur [2]]; if (expect_false (d3 < 0)) ERR ("exactly four hexadecimal digits expected");
d4 = decode_hexdigit [cur [3]]; if (expect_false (d4 < 0)) ERR ("exactly four hexadecimal digits expected");
dec->cur += 4;
return ((UV)d1) << 12
| ((UV)d2) << 8
| ((UV)d3) << 4
| ((UV)d4);
fail:
return (UV)-1;
}
static SV *
decode_str (dec_t *dec)
{
SV *sv = 0;
int utf8 = 0;
char *dec_cur = dec->cur;
do
{
char buf [SHORT_STRING_LEN + UTF8_MAXBYTES];
char *cur = buf;
do
{
unsigned char ch = *(unsigned char *)dec_cur++;
if (expect_false (ch == '"'))
{
--dec_cur;
break;
}
else if (expect_false (ch == '\\'))
{
switch (*dec_cur)
{
case '\\':
case '/':
case '"': *cur++ = *dec_cur++; break;
case 'b': ++dec_cur; *cur++ = '\010'; break;
case 't': ++dec_cur; *cur++ = '\011'; break;
case 'n': ++dec_cur; *cur++ = '\012'; break;
case 'f': ++dec_cur; *cur++ = '\014'; break;
case 'r': ++dec_cur; *cur++ = '\015'; break;
case 'u':
{
UV lo, hi;
++dec_cur;
dec->cur = dec_cur;
hi = decode_4hex (dec);
dec_cur = dec->cur;
if (hi == (UV)-1)
goto fail;
// possibly a surrogate pair
if (hi >= 0xd800)
if (hi < 0xdc00)
{
if (dec_cur [0] != '\\' || dec_cur [1] != 'u')
ERR ("missing low surrogate character in surrogate pair");
dec_cur += 2;
dec->cur = dec_cur;
lo = decode_4hex (dec);
dec_cur = dec->cur;
if (lo == (UV)-1)
goto fail;
if (lo < 0xdc00 || lo >= 0xe000)
ERR ("surrogate pair expected");
hi = (hi - 0xD800) * 0x400 + (lo - 0xDC00) + 0x10000;
}
else if (hi < 0xe000)
ERR ("missing high surrogate character in surrogate pair");
if (hi >= 0x80)
{
utf8 = 1;
cur = encode_utf8 (cur, hi);
}
else
*cur++ = hi;
}
break;
default:
--dec_cur;
ERR ("illegal backslash escape sequence in string");
}
}
else if (expect_true (ch >= 0x20 && ch < 0x80))
*cur++ = ch;
else if (ch >= 0x80)
{
STRLEN clen;
--dec_cur;
decode_utf8 (dec_cur, dec->end - dec_cur, &clen);
if (clen == (STRLEN)-1)
ERR ("malformed UTF-8 character in JSON string");
do
*cur++ = *dec_cur++;
while (--clen);
utf8 = 1;
}
else if (ch == '\t' && dec->json.flags & F_RELAXED)
*cur++ = ch;
else
{
--dec_cur;
if (!ch)
ERR ("unexpected end of string while parsing JSON string");
else
ERR ("invalid character encountered while parsing JSON string");
}
}
while (cur < buf + SHORT_STRING_LEN);
{
STRLEN len = cur - buf;
if (sv)
{
STRLEN cur = SvCUR (sv);
if (SvLEN (sv) - cur <= len)
json_sv_grow (sv, cur, len);
memcpy (SvPVX (sv) + SvCUR (sv), buf, len);
SvCUR_set (sv, SvCUR (sv) + len);
}
else
sv = newSVpvn (buf, len);
}
}
while (*dec_cur != '"');
++dec_cur;
if (sv)
{
SvPOK_only (sv);
*SvEND (sv) = 0;
if (utf8)
SvUTF8_on (sv);
}
else
sv = newSVpvn ("", 0);
dec->cur = dec_cur;
return sv;
fail:
dec->cur = dec_cur;
return 0;
}
static SV *
decode_num (dec_t *dec)
{
int is_nv = 0;
char *start = dec->cur;
// [minus]
if (*dec->cur == '-')
++dec->cur;
if (*dec->cur == '0')
{
++dec->cur;
if (*dec->cur >= '0' && *dec->cur <= '9')
ERR ("malformed number (leading zero must not be followed by another digit)");
}
else if (*dec->cur < '0' || *dec->cur > '9')
ERR ("malformed number (no digits after initial minus)");
else
do
{
++dec->cur;
}
while (*dec->cur >= '0' && *dec->cur <= '9');
// [frac]
if (*dec->cur == '.')
{
++dec->cur;
if (*dec->cur < '0' || *dec->cur > '9')
ERR ("malformed number (no digits after decimal point)");
do
{
++dec->cur;
}
while (*dec->cur >= '0' && *dec->cur <= '9');
is_nv = 1;
}
// [exp]
if (*dec->cur == 'e' || *dec->cur == 'E')
{
++dec->cur;
if (*dec->cur == '-' || *dec->cur == '+')
++dec->cur;
if (*dec->cur < '0' || *dec->cur > '9')
ERR ("malformed number (no digits after exp sign)");
do
{
++dec->cur;
}
while (*dec->cur >= '0' && *dec->cur <= '9');
is_nv = 1;
}
if (!is_nv)
{
int len = dec->cur - start;
// special case the rather common 1..5-digit-int case
if (*start == '-')
switch (len)
{
case 2: return newSViv (-(IV)( start [1] - '0' * 1));
case 3: return newSViv (-(IV)( start [1] * 10 + start [2] - '0' * 11));
case 4: return newSViv (-(IV)( start [1] * 100 + start [2] * 10 + start [3] - '0' * 111));
case 5: return newSViv (-(IV)( start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 1111));
case 6: return newSViv (-(IV)(start [1] * 10000 + start [2] * 1000 + start [3] * 100 + start [4] * 10 + start [5] - '0' * 11111));
}
else
switch (len)
{
case 1: return newSViv ( start [0] - '0' * 1);
case 2: return newSViv ( start [0] * 10 + start [1] - '0' * 11);
case 3: return newSViv ( start [0] * 100 + start [1] * 10 + start [2] - '0' * 111);
case 4: return newSViv ( start [0] * 1000 + start [1] * 100 + start [2] * 10 + start [3] - '0' * 1111);
case 5: return newSViv ( start [0] * 10000 + start [1] * 1000 + start [2] * 100 + start [3] * 10 + start [4] - '0' * 11111);
}
{
UV uv;
int numtype = grok_number (start, len, &uv);
if (numtype & IS_NUMBER_IN_UV)
if (numtype & IS_NUMBER_NEG)
{
if (uv < (UV)IV_MIN)
return newSViv (-(IV)uv);
}
else
return newSVuv (uv);
}
len -= *start == '-' ? 1 : 0;
// does not fit into IV or UV, try NV
if (len <= NV_DIG)
// fits into NV without loss of precision
return newSVnv (json_atof (start));
// everything else fails, convert it to a string
return newSVpvn (start, dec->cur - start);
}
// loss of precision here
return newSVnv (json_atof (start));
fail:
return 0;
}
static SV *
decode_av (dec_t *dec)
{
AV *av = newAV ();
DEC_INC_DEPTH;
decode_ws (dec);
if (*dec->cur == ']')
++dec->cur;
else
for (;;)
{
SV *value;
value = decode_sv (dec);
if (!value)
goto fail;
av_push (av, value);
decode_ws (dec);
if (*dec->cur == ']')
{
++dec->cur;
break;
}
if (*dec->cur != ',')
ERR (", or ] expected while parsing array");
++dec->cur;
decode_ws (dec);
if (*dec->cur == ']' && dec->json.flags & F_RELAXED)
{
++dec->cur;
break;
}
}
DEC_DEC_DEPTH;
return newRV_noinc ((SV *)av);
fail:
SvREFCNT_dec (av);
DEC_DEC_DEPTH;
return 0;
}
static SV *
decode_hv (dec_t *dec)
{
SV *sv;
HV *hv = newHV ();
DEC_INC_DEPTH;
decode_ws (dec);
if (*dec->cur == '}')
++dec->cur;
else
for (;;)
{
EXPECT_CH ('"');
// heuristic: assume that
// a) decode_str + hv_store_ent are abysmally slow.
// b) most hash keys are short, simple ascii text.
// => try to "fast-match" such strings to avoid
// the overhead of decode_str + hv_store_ent.
{
SV *value;
char *p = dec->cur;
char *e = p + 24; // only try up to 24 bytes
for (;;)
{
// the >= 0x80 is false on most architectures
if (p == e || *p < 0x20 || *p >= 0x80 || *p == '\\')
{
// slow path, back up and use decode_str
SV *key = decode_str (dec);
if (!key)
goto fail;
decode_ws (dec); EXPECT_CH (':');
decode_ws (dec);
value = decode_sv (dec);
if (!value)
{
SvREFCNT_dec (key);
goto fail;
}
hv_store_ent (hv, key, value, 0);
SvREFCNT_dec (key);
break;
}
else if (*p == '"')
{
// fast path, got a simple key
char *key = dec->cur;
int len = p - key;
dec->cur = p + 1;
decode_ws (dec); EXPECT_CH (':');
decode_ws (dec);
value = decode_sv (dec);
if (!value)
goto fail;
hv_store (hv, key, len, value, 0);
break;
}
++p;
}
}
decode_ws (dec);
if (*dec->cur == '}')
{
++dec->cur;
break;
}
if (*dec->cur != ',')
ERR (", or } expected while parsing object/hash");
++dec->cur;
decode_ws (dec);
if (*dec->cur == '}' && dec->json.flags & F_RELAXED)
{
++dec->cur;
break;
}
}
DEC_DEC_DEPTH;
sv = newRV_noinc ((SV *)hv);
// check filter callbacks
if (expect_false (dec->json.flags & F_HOOK))
{
if (dec->json.cb_sk_object && HvKEYS (hv) == 1)
{
HE *cb, *he;
hv_iterinit (hv);
he = hv_iternext (hv);
hv_iterinit (hv);
// the next line creates a mortal sv each time it's called.
// might want to optimise this for common cases.
cb = hv_fetch_ent (dec->json.cb_sk_object, hv_iterkeysv (he), 0, 0);
if (cb)
{
dSP;
int count;
ENTER; SAVETMPS;
PUSHMARK (SP);
XPUSHs (HeVAL (he));
sv_2mortal (sv);
PUTBACK; count = call_sv (HeVAL (cb), G_ARRAY); SPAGAIN;
if (count == 1)
{
sv = newSVsv (POPs);
PUTBACK;
FREETMPS; LEAVE;
return sv;
}
else if (count)
croak ("filter_json_single_key_object callbacks must not return more than one scalar");
PUTBACK;
SvREFCNT_inc (sv);
FREETMPS; LEAVE;
}
}
if (dec->json.cb_object)
{
dSP;
int count;
ENTER; SAVETMPS;
PUSHMARK (SP);
XPUSHs (sv_2mortal (sv));
PUTBACK; count = call_sv (dec->json.cb_object, G_ARRAY); SPAGAIN;
if (count == 1)
sv = newSVsv (POPs);
else if (count == 0)
SvREFCNT_inc (sv);
else
croak ("filter_json_object callbacks must not return more than one scalar");
PUTBACK;
FREETMPS; LEAVE;
}
}
return sv;
fail:
SvREFCNT_dec (hv);
DEC_DEC_DEPTH;
return 0;
}
static SV *
decode_tag (dec_t *dec)
{
SV *tag = 0;
SV *val = 0;
if (!(dec->json.flags & F_ALLOW_TAGS))
ERR ("malformed JSON string, neither array, object, number, string or atom");
++dec->cur;
decode_ws (dec);
tag = decode_sv (dec);
if (!tag)
goto fail;
if (!SvPOK (tag))
ERR ("malformed JSON string, (tag) must be a string");
decode_ws (dec);
if (*dec->cur != ')')
ERR (") expected after tag");
++dec->cur;
decode_ws (dec);
val = decode_sv (dec);
if (!val)
goto fail;
if (!SvROK (val) || SvTYPE (SvRV (val)) != SVt_PVAV)
ERR ("malformed JSON string, tag value must be an array");
{
AV *av = (AV *)SvRV (val);
int i, len = av_len (av) + 1;
HV *stash = gv_stashsv (tag, 0);
SV *sv;
if (!stash)
ERR ("cannot decode perl-object (package does not exist)");
GV *method = gv_fetchmethod_autoload (stash, "THAW", 0);
if (!method)
ERR ("cannot decode perl-object (package does not have a THAW method)");
dSP;
ENTER; SAVETMPS;
PUSHMARK (SP);
EXTEND (SP, len + 2);
// we re-bless the reference to get overload and other niceties right
PUSHs (tag);
PUSHs (sv_json);
for (i = 0; i < len; ++i)
PUSHs (*av_fetch (av, i, 1));
PUTBACK;
call_sv ((SV *)GvCV (method), G_SCALAR);
SPAGAIN;
SvREFCNT_dec (tag);
SvREFCNT_dec (val);
sv = SvREFCNT_inc (POPs);
PUTBACK;
FREETMPS; LEAVE;
return sv;
}
fail:
SvREFCNT_dec (tag);
SvREFCNT_dec (val);
return 0;
}
static SV *
decode_sv (dec_t *dec)
{
// the beauty of JSON: you need exactly one character lookahead
// to parse everything.
switch (*dec->cur)
{
case '"': ++dec->cur; return decode_str (dec);
case '[': ++dec->cur; return decode_av (dec);
case '{': ++dec->cur; return decode_hv (dec);
case '(': return decode_tag (dec);
case '-':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return decode_num (dec);
case 'f':
if (dec->end - dec->cur >= 5 && !memcmp (dec->cur, "false", 5))
{
dec->cur += 5;
if (expect_false (!dec->json.v_false))
dec->json.v_false = GET_BOOL (false);
return newSVsv (dec->json.v_false);
}
else
ERR ("'false' expected");
break;
case 't':
if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "true", 4))
{
dec->cur += 4;
if (expect_false (!dec->json.v_true))
dec->json.v_true = GET_BOOL (true);
return newSVsv (dec->json.v_true);
}
else
ERR ("'true' expected");
break;
case 'n':
if (dec->end - dec->cur >= 4 && !memcmp (dec->cur, "null", 4))
{
dec->cur += 4;
return newSVsv (&PL_sv_undef);
}
else
ERR ("'null' expected");
break;
default:
ERR ("malformed JSON string, neither tag, array, object, number, string or atom");
break;
}
fail:
return 0;
}
static SV *
decode_json (SV *string, JSON *json, STRLEN *offset_return)
{
dec_t dec;
SV *sv;
/* work around bugs in 5.10 where manipulating magic values
* makes perl ignore the magic in subsequent accesses.
* also make a copy of non-PV values, to get them into a clean
* state (SvPV should do that, but it's buggy, see below).
*
* SvIsCOW_shared_hash works around a bug in perl (possibly 5.16),
* as reported by Reini Urban.
*/
/*SvGETMAGIC (string);*/
if (SvMAGICAL (string) || !SvPOK (string) || SvIsCOW_shared_hash (string))
string = sv_2mortal (newSVsv (string));
SvUPGRADE (string, SVt_PV);
/* work around a bug in perl 5.10, which causes SvCUR to fail an
* assertion with -DDEBUGGING, although SvCUR is documented to
* return the xpv_cur field which certainly exists after upgrading.
* according to nicholas clark, calling SvPOK fixes this.
* But it doesn't fix it, so try another workaround, call SvPV_nolen
* and hope for the best.
* Damnit, SvPV_nolen still trips over yet another assertion. This
* assertion business is seriously broken, try yet another workaround
* for the broken -DDEBUGGING.
*/
{
#ifdef DEBUGGING
STRLEN offset = SvOK (string) ? sv_len (string) : 0;
#else
STRLEN offset = SvCUR (string);
#endif
if (offset > json->max_size && json->max_size)
croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
(unsigned long)SvCUR (string), (unsigned long)json->max_size);
}
if (DECODE_WANTS_OCTETS (json))
sv_utf8_downgrade (string, 0);
else
sv_utf8_upgrade (string);
SvGROW (string, SvCUR (string) + 1); // should basically be a NOP
dec.json = *json;
dec.cur = SvPVX (string);
dec.end = SvEND (string);
dec.err = 0;
dec.depth = 0;
if (dec.json.cb_object || dec.json.cb_sk_object)
dec.json.flags |= F_HOOK;
*dec.end = 0; // this should basically be a nop, too, but make sure it's there
decode_ws (&dec);
sv = decode_sv (&dec);
if (offset_return)
*offset_return = dec.cur - SvPVX (string);
else if (sv)
{
// check for trailing garbage
decode_ws (&dec);
if (dec.cur != dec.end)
{
dec.err = "garbage after JSON object";
SvREFCNT_dec (sv);
sv = 0;
}
}
if (!sv)
{
SV *uni = sv_newmortal ();
// horrible hack to silence warning inside pv_uni_display
COP cop = *PL_curcop;
cop.cop_warnings = pWARN_NONE;
ENTER;
SAVEVPTR (PL_curcop);
PL_curcop = &cop;
pv_uni_display (uni, dec.cur, dec.end - dec.cur, 20, UNI_DISPLAY_QQ);
LEAVE;
croak ("%s, at character offset %d (before \"%s\")",
dec.err,
(int)ptr_to_index (string, dec.cur),
dec.cur != dec.end ? SvPV_nolen (uni) : "(end of string)");
}
sv = sv_2mortal (sv);
if (!(dec.json.flags & F_ALLOW_NONREF) && json_nonref (sv))
croak ("JSON text must be an object or array (but found number, string, true, false or null, use allow_nonref to allow this)");
return sv;
}
/////////////////////////////////////////////////////////////////////////////
// incremental parser
static void
incr_parse (JSON *self)
{
const char *p = SvPVX (self->incr_text) + self->incr_pos;
// the state machine here is a bit convoluted and could be simplified a lot
// but this would make it slower, so...
for (;;)
{
switch (self->incr_mode)
{
// reached end of a scalar, see if we are inside a nested structure or not
end_of_scalar:
self->incr_mode = INCR_M_JSON;
if (self->incr_nest) // end of a scalar inside array, object or tag
goto incr_m_json;
else // end of scalar outside structure, json text ends here
goto interrupt;
// only used for initial whitespace skipping
case INCR_M_WS:
for (;;)
{
if (*p > 0x20)
{
if (*p == '#')
{
self->incr_mode = INCR_M_C0;
goto incr_m_c;
}
else
{
self->incr_mode = INCR_M_JSON;
goto incr_m_json;
}
}
else if (!*p)
goto interrupt;
++p;
}
// skip a single char inside a string (for \\-processing)
case INCR_M_BS:
if (!*p)
goto interrupt;
++p;
self->incr_mode = INCR_M_STR;
goto incr_m_str;
// inside #-style comments
case INCR_M_C0:
case INCR_M_C1:
incr_m_c:
for (;;)
{
if (*p == '\n')
{
self->incr_mode = self->incr_mode == INCR_M_C0 ? INCR_M_WS : INCR_M_JSON;
break;
}
else if (!*p)
goto interrupt;
++p;
}
break;
// inside true/false/null
case INCR_M_TFN:
incr_m_tfn:
for (;;)
switch (*p++)
{
case 'r': case 'u': case 'e': // tRUE, falsE, nUll
case 'a': case 'l': case 's': // fALSe, nuLL
// allowed
break;
default:
--p;
goto end_of_scalar;
}
// inside a number
case INCR_M_NUM:
incr_m_num:
for (;;)
switch (*p++)
{
case 'e': case 'E': case '.': case '+':
case '-':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
// allowed
break;
default:
--p;
goto end_of_scalar;
}
// inside a string
case INCR_M_STR:
incr_m_str:
for (;;)
{
if (*p == '"')
{
++p;
goto end_of_scalar;
}
else if (*p == '\\')
{
++p; // "virtually" consumes character after \
if (!*p) // if at end of string we have to switch modes
{
self->incr_mode = INCR_M_BS;
goto interrupt;
}
}
else if (!*p)
goto interrupt;
++p;
}
// after initial ws, outside string
case INCR_M_JSON:
incr_m_json:
for (;;)
{
switch (*p++)
{
case 0:
--p;
goto interrupt;
case 0x09:
case 0x0a:
case 0x0d:
case 0x20:
if (!self->incr_nest)
{
--p; // do not eat the whitespace, let the next round do it
goto interrupt;
}
break;
// the following three blocks handle scalars. this makes the parser
// more strict than required inside arrays or objects, and could
// be moved to a special case on the toplevel (except strings)
case 't':
case 'f':
case 'n':
self->incr_mode = INCR_M_TFN;
goto incr_m_tfn;
case '-':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
self->incr_mode = INCR_M_NUM;
goto incr_m_num;
case '"':
self->incr_mode = INCR_M_STR;
goto incr_m_str;
case '[':
case '{':
case '(':
if (++self->incr_nest > self->max_depth)
croak (ERR_NESTING_EXCEEDED);
break;
case ']':
case '}':
if (--self->incr_nest <= 0)
goto interrupt;
break;
case ')':
--self->incr_nest;
break;
case '#':
self->incr_mode = INCR_M_C1;
goto incr_m_c;
}
}
}
modechange:
;
}
interrupt:
self->incr_pos = p - SvPVX (self->incr_text);
//printf ("interrupt<%.*s>\n", self->incr_pos, SvPVX(self->incr_text));//D
//printf ("return pos %d mode %d nest %d\n", self->incr_pos, self->incr_mode, self->incr_nest);//D
}
/////////////////////////////////////////////////////////////////////////////
// XS interface functions
MODULE = JSON::XS PACKAGE = JSON::XS
BOOT:
{
int i;
for (i = 0; i < 256; ++i)
decode_hexdigit [i] =
i >= '0' && i <= '9' ? i - '0'
: i >= 'a' && i <= 'f' ? i - 'a' + 10
: i >= 'A' && i <= 'F' ? i - 'A' + 10
: -1;
json_stash = gv_stashpv ("JSON::XS" , 1);
bool_stash = gv_stashpv ("Types::Serialiser::Boolean", 1);
bool_false = get_bool ("Types::Serialiser::false");
bool_true = get_bool ("Types::Serialiser::true");
sv_json = newSVpv ("JSON", 0);
SvREADONLY_on (sv_json);
CvNODEBUG_on (get_cv ("JSON::XS::incr_text", 0)); /* the debugger completely breaks lvalue subs */
}
PROTOTYPES: DISABLE
void CLONE (...)
CODE:
// as long as these writes are atomic, the race should not matter
// as existing threads either already use 0, or use the old value,
// which is sitll correct for the initial thread.
json_stash = 0;
bool_stash = 0;
bool_false = 0;
bool_true = 0;
void new (char *klass)
PPCODE:
{
SV *pv = NEWSV (0, sizeof (JSON));
SvPOK_only (pv);
json_init ((JSON *)SvPVX (pv));
XPUSHs (sv_2mortal (sv_bless (
newRV_noinc (pv),
strEQ (klass, "JSON::XS") ? JSON_STASH : gv_stashpv (klass, 1)
)));
}
void boolean_values (JSON *self, SV *v_false = 0, SV *v_true = 0)
PPCODE:
self->v_false = newSVsv (v_false);
self->v_true = newSVsv (v_true);
XPUSHs (ST (0));
void get_boolean_values (JSON *self)
PPCODE:
if (self->v_false && self->v_true)
{
EXTEND (SP, 2);
PUSHs (self->v_false);
PUSHs (self->v_true);
}
void ascii (JSON *self, int enable = 1)
ALIAS:
ascii = F_ASCII
latin1 = F_LATIN1
utf8 = F_UTF8
indent = F_INDENT
canonical = F_CANONICAL
space_before = F_SPACE_BEFORE
space_after = F_SPACE_AFTER
pretty = F_PRETTY
allow_nonref = F_ALLOW_NONREF
shrink = F_SHRINK
allow_blessed = F_ALLOW_BLESSED
convert_blessed = F_CONV_BLESSED
relaxed = F_RELAXED
allow_unknown = F_ALLOW_UNKNOWN
allow_tags = F_ALLOW_TAGS
PPCODE:
{
if (enable)
self->flags |= ix;
else
self->flags &= ~ix;
XPUSHs (ST (0));
}
void get_ascii (JSON *self)
ALIAS:
get_ascii = F_ASCII
get_latin1 = F_LATIN1
get_utf8 = F_UTF8
get_indent = F_INDENT
get_canonical = F_CANONICAL
get_space_before = F_SPACE_BEFORE
get_space_after = F_SPACE_AFTER
get_allow_nonref = F_ALLOW_NONREF
get_shrink = F_SHRINK
get_allow_blessed = F_ALLOW_BLESSED
get_convert_blessed = F_CONV_BLESSED
get_relaxed = F_RELAXED
get_allow_unknown = F_ALLOW_UNKNOWN
get_allow_tags = F_ALLOW_TAGS
PPCODE:
XPUSHs (boolSV (self->flags & ix));
void max_depth (JSON *self, U32 max_depth = 0x80000000UL)
PPCODE:
self->max_depth = max_depth;
XPUSHs (ST (0));
U32 get_max_depth (JSON *self)
CODE:
RETVAL = self->max_depth;
OUTPUT:
RETVAL
void max_size (JSON *self, U32 max_size = 0)
PPCODE:
self->max_size = max_size;
XPUSHs (ST (0));
int get_max_size (JSON *self)
CODE:
RETVAL = self->max_size;
OUTPUT:
RETVAL
void filter_json_object (JSON *self, SV *cb = &PL_sv_undef)
PPCODE:
{
SvREFCNT_dec (self->cb_object);
self->cb_object = SvOK (cb) ? newSVsv (cb) : 0;
XPUSHs (ST (0));
}
void filter_json_single_key_object (JSON *self, SV *key, SV *cb = &PL_sv_undef)
PPCODE:
{
if (!self->cb_sk_object)
self->cb_sk_object = newHV ();
if (SvOK (cb))
hv_store_ent (self->cb_sk_object, key, newSVsv (cb), 0);
else
{
hv_delete_ent (self->cb_sk_object, key, G_DISCARD, 0);
if (!HvKEYS (self->cb_sk_object))
{
SvREFCNT_dec (self->cb_sk_object);
self->cb_sk_object = 0;
}
}
XPUSHs (ST (0));
}
void encode (JSON *self, SV *scalar)
PPCODE:
PUTBACK; scalar = encode_json (scalar, self); SPAGAIN;
XPUSHs (scalar);
void decode (JSON *self, SV *jsonstr)
PPCODE:
PUTBACK; jsonstr = decode_json (jsonstr, self, 0); SPAGAIN;
XPUSHs (jsonstr);
void decode_prefix (JSON *self, SV *jsonstr)
PPCODE:
{
SV *sv;
STRLEN offset;
PUTBACK; sv = decode_json (jsonstr, self, &offset); SPAGAIN;
EXTEND (SP, 2);
PUSHs (sv);
PUSHs (sv_2mortal (newSVuv (ptr_to_index (jsonstr, SvPV_nolen (jsonstr) + offset))));
}
void incr_parse (JSON *self, SV *jsonstr = 0)
PPCODE:
{
if (!self->incr_text)
self->incr_text = newSVpvn ("", 0);
/* if utf8-ness doesn't match the decoder, need to upgrade/downgrade */
if (!DECODE_WANTS_OCTETS (self) == !SvUTF8 (self->incr_text))
if (DECODE_WANTS_OCTETS (self))
{
if (self->incr_pos)
self->incr_pos = utf8_length ((U8 *)SvPVX (self->incr_text),
(U8 *)SvPVX (self->incr_text) + self->incr_pos);
sv_utf8_downgrade (self->incr_text, 0);
}
else
{
sv_utf8_upgrade (self->incr_text);
if (self->incr_pos)
self->incr_pos = utf8_hop ((U8 *)SvPVX (self->incr_text), self->incr_pos)
- (U8 *)SvPVX (self->incr_text);
}
// append data, if any
if (jsonstr)
{
/* make sure both strings have same encoding */
if (SvUTF8 (jsonstr) != SvUTF8 (self->incr_text))
if (SvUTF8 (jsonstr))
sv_utf8_downgrade (jsonstr, 0);
else
sv_utf8_upgrade (jsonstr);
/* and then just blindly append */
{
STRLEN len;
const char *str = SvPV (jsonstr, len);
STRLEN cur = SvCUR (self->incr_text);
if (SvLEN (self->incr_text) - cur <= len)
json_sv_grow (self->incr_text, cur, len);
Move (str, SvEND (self->incr_text), len, char);
SvCUR_set (self->incr_text, SvCUR (self->incr_text) + len);
*SvEND (self->incr_text) = 0; // this should basically be a nop, too, but make sure it's there
}
}
if (GIMME_V != G_VOID)
do
{
SV *sv;
STRLEN offset;
if (!INCR_DONE (self))
{
incr_parse (self);
if (self->incr_pos > self->max_size && self->max_size)
croak ("attempted decode of JSON text of %lu bytes size, but max_size is set to %lu",
(unsigned long)self->incr_pos, (unsigned long)self->max_size);
if (!INCR_DONE (self))
{
// as an optimisation, do not accumulate white space in the incr buffer
if (self->incr_mode == INCR_M_WS && self->incr_pos)
{
self->incr_pos = 0;
SvCUR_set (self->incr_text, 0);
}
break;
}
}
PUTBACK; sv = decode_json (self->incr_text, self, &offset); SPAGAIN;
XPUSHs (sv);
self->incr_pos -= offset;
self->incr_nest = 0;
self->incr_mode = 0;
sv_chop (self->incr_text, SvPVX (self->incr_text) + offset);
}
while (GIMME_V == G_ARRAY);
}
SV *incr_text (JSON *self)
ATTRS: lvalue
CODE:
{
if (self->incr_pos)
croak ("incr_text can not be called when the incremental parser already started parsing");
RETVAL = self->incr_text ? SvREFCNT_inc (self->incr_text) : &PL_sv_undef;
}
OUTPUT:
RETVAL
void incr_skip (JSON *self)
CODE:
{
if (self->incr_pos)
{
sv_chop (self->incr_text, SvPV_nolen (self->incr_text) + self->incr_pos);
self->incr_pos = 0;
self->incr_nest = 0;
self->incr_mode = 0;
}
}
void incr_reset (JSON *self)
CODE:
{
SvREFCNT_dec (self->incr_text);
self->incr_text = 0;
self->incr_pos = 0;
self->incr_nest = 0;
self->incr_mode = 0;
}
void DESTROY (JSON *self)
CODE:
SvREFCNT_dec (self->v_false);
SvREFCNT_dec (self->v_true);
SvREFCNT_dec (self->cb_sk_object);
SvREFCNT_dec (self->cb_object);
SvREFCNT_dec (self->incr_text);
PROTOTYPES: ENABLE
void encode_json (SV *scalar)
PPCODE:
{
JSON json;
json_init (&json);
json.flags |= F_UTF8;
PUTBACK; scalar = encode_json (scalar, &json); SPAGAIN;
XPUSHs (scalar);
}
void decode_json (SV *jsonstr)
PPCODE:
{
JSON json;
json_init (&json);
json.flags |= F_UTF8;
PUTBACK; jsonstr = decode_json (jsonstr, &json, 0); SPAGAIN;
XPUSHs (jsonstr);
}
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