248 lines
8.4 KiB
C
248 lines
8.4 KiB
C
typedef struct {
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fustr out;
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UV depth;
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} fujson_fmt_ctx;
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static void fujson_fmt(pTHX_ fujson_fmt_ctx *, SV *);
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static void fujson_fmt_str(pTHX_ fujson_fmt_ctx *ctx, const char *stri, size_t len, int utf8) {
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size_t off = 0, loff;
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const unsigned char *str = (const unsigned char *)stri;
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unsigned char *buf;
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unsigned char x = 0;
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/* Validate entire string for conformance if this is flagged as a utf8
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* string, this lets us be lazy further on.
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* Commenting this out doubles the performance for formatting unicode
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* strings, I suspect there's room for optimizations in
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* is_c9strict_utf8_string(). */
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if (utf8 && !is_c9strict_utf8_string(str, len)) {
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croak("invalid codepoint encountered in string, cannot format to JSON");
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}
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fustr_write(&ctx->out, "\"", 1);
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fustr_reserve(&ctx->out, len);
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while (off < len) {
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/* Fast path: no escaping needed */
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loff = off;
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if (utf8) {
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/* we already validated everything >=0x80 */
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while (off < len) {
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x = str[off];
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if (x <= 0x1f || x == '"' || x == '\\' || x == 0x7f) break;
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off++;
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}
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} else {
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/* binary strings need special handling for >=0x80 */
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while (off < len) {
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x = str[off];
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if (x <= 0x1f || x == '"' || x == '\\' || x >= 0x7f) break;
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off++;
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}
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}
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fustr_write(&ctx->out, (char *)str+loff, off-loff);
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if (off < len) { /* early break, which means current byte needs special processing */
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switch (x) {
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case '"': fustr_write(&ctx->out, "\\\"", 2); break;
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case '\\': fustr_write(&ctx->out, "\\\\", 2); break;
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case 0x08: fustr_write(&ctx->out, "\\b", 2); break;
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case 0x09: fustr_write(&ctx->out, "\\t", 2); break;
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case 0x0a: fustr_write(&ctx->out, "\\n", 2); break;
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case 0x0c: fustr_write(&ctx->out, "\\f", 2); break;
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case 0x0d: fustr_write(&ctx->out, "\\r", 2); break;
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default:
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if (x < 0x80) {
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buf = (unsigned char *)fustr_write_buf(&ctx->out, 6);
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memcpy(buf, "\\u00", 4);
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buf[4] = PL_hexdigit[(x >> 4) & 0x0f];
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buf[5] = PL_hexdigit[x & 0x0f];
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} else { /* x >= 0x80, !utf8, so encode as 2-byte UTF-8 */
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buf = (unsigned char *)fustr_write_buf(&ctx->out, 2);
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buf[0] = 0xc0 | (x >> 6);
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buf[1] = 0x80 | (x & 0x3f);
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}
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}
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off++;
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}
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}
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fustr_write(&ctx->out, "\"", 1);
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}
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/* All digits between 0 and 100, a trick I borrowed from the Zig stdlib. */
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static const char fujson_digits[] =
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"00010203040506070809"
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"10111213141516171819"
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"20212223242526272829"
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"30313233343536373839"
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"40414243444546474849"
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"50515253545556575859"
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"60616263646566676869"
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"70717273747576777879"
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"80818283848586878889"
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"90919293949596979899";
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static void fujson_fmt_int(pTHX_ fujson_fmt_ctx *ctx, SV *val) {
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char buf[32];
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char *r = buf+31;
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int neg = 0;
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IV iv;
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UV uv;
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if (SvIsUV(val)) { /* Why is this macro not documented? */
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uv = SvUV_nomg(val);
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} else {
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iv = SvIV_nomg(val);
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neg = iv < 0;
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uv = neg ? -iv : iv;
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}
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if (uv == 0) {
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fustr_write(&ctx->out, "0", 1);
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return;
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}
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while (uv >= 10) {
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r -= 2;
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memcpy(r, fujson_digits + ((uv % 100)<<1), 2);
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uv /= 100;
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}
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if (uv > 0) *(--r) = '0' + (uv % 10);
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if (neg) *(--r) = '-';
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fustr_write(&ctx->out, r, 31 - (r - buf));
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}
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static void fujson_fmt_av(pTHX_ fujson_fmt_ctx *ctx, AV *av) {
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int i, len = av_count(av);
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fustr_write(&ctx->out, "[", 1);
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for (i=0; i<len; i++) {
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if (i) fustr_write(&ctx->out, ",", 1);
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SV **sv = av_fetch(av, i, 0);
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if (sv) fujson_fmt(aTHX_ ctx, *sv); /* sv will have magic if av is tied, but fujson_fmt() handles that. */
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else fustr_write(&ctx->out, "null", 4);
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}
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fustr_write(&ctx->out, "]", 1);
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}
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static void fujson_fmt_hv(pTHX_ fujson_fmt_ctx *ctx, HV *hv) {
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HE *he;
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STRLEN helen;
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char *hestr = NULL;
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hv_iterinit(hv);
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fustr_write(&ctx->out, "{", 1);
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while ((he = hv_iternext(hv))) {
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if (hestr) fustr_write(&ctx->out, ",", 1);
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hestr = HePV(he, helen);
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fujson_fmt_str(aTHX_ ctx, hestr, helen, HeUTF8(he));
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fustr_write(&ctx->out, ":", 1);
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fujson_fmt(aTHX_ ctx, UNLIKELY(SvMAGICAL(hv)) ? hv_iterval(hv, he) : HeVAL(he));
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}
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fustr_write(&ctx->out, "}", 1);
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}
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static void fujson_fmt_obj(pTHX_ fujson_fmt_ctx *ctx, SV *rv, SV *obj) {
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dSP;
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GV *method = gv_fetchmethod_autoload(SvSTASH(obj), "TO_JSON", 0);
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if (!method) croak("unable to format '%s' object as JSON", HvNAME(SvSTASH(obj)));
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ENTER;
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SAVETMPS;
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PUSHMARK(SP);
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XPUSHs(rv);
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PUTBACK;
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call_sv((SV *)GvCV(method), G_SCALAR);
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SPAGAIN;
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/* JSON::XS describes this error as "surprisingly common"... I'd be
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* surprised indeed if it happens at all, but I suppose it can't hurt to
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* copy their check; this sounds like be a pain to debug otherwise. */
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if (SvROK(TOPs) && SvRV(TOPs) == obj)
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croak("%s::TO_JSON method returned same object as was passed instead of a new one", HvNAME(SvSTASH(obj)));
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obj = POPs;
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PUTBACK;
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fujson_fmt(aTHX_ ctx, obj);
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FREETMPS;
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LEAVE;
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}
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static void fujson_fmt(pTHX_ fujson_fmt_ctx *ctx, SV *val) {
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SvGETMAGIC(val);
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/* XXX: &PL_sv_yes and &PL_sv_no are proper booleans under 5.40, so no need
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* to explicitly check for those; does this work in 5.36 as well? */
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if (SvIsBOOL(val)) { /* Must check before IOKp & POKp, because bool implies both flags */
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if (BOOL_INTERNALS_sv_isbool_true(val)) fustr_write(&ctx->out, "true", 4);
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else fustr_write(&ctx->out, "false", 5);
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} else if (SvPOKp(val)) {
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fujson_fmt_str(aTHX_ ctx, SvPVX(val), SvCUR(val), SvUTF8(val));
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} else if (SvNOKp(val)) { /* Must check before IOKp, because integer conversion might have been lossy */
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NV nv = SvNV_nomg(val);
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if (isinfnan(nv)) croak("unable to format floating point NaN or Inf as JSON");
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/* XXX: Cpanel::JSON::XS appears to always append a ".0" for round numbers, other modules do not. */
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/* XXX#2: This doesn't support quadmath. Makefile.PL checks for that */
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fustr_reserve(&ctx->out, NV_DIG+1);
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Gconvert(nv, NV_DIG, 0, ctx->out.cur);
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ctx->out.cur += strlen(ctx->out.cur);
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} else if (SvIOKp(val)) {
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fujson_fmt_int(aTHX_ ctx, val);
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} else if (SvROK(val)) {
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/* Simply consider every reference a form of nesting. TO_JSON may
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* return a scalar, but it may also return another TO_JSON object and
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* cause a stack overflow that way. */
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if (--ctx->depth == 0) croak("max_depth exceeded while formatting JSON");
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SV *rv = SvRV(val);
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SvGETMAGIC(rv);
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if (UNLIKELY(SvOBJECT(rv))) fujson_fmt_obj(aTHX_ ctx, val, rv);
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else if (SvTYPE(rv) == SVt_PVHV) fujson_fmt_hv(aTHX_ ctx, (HV *)rv);
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else if (SvTYPE(rv) == SVt_PVAV) fujson_fmt_av(aTHX_ ctx, (AV *)rv);
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else croak("unable to format reference '%s' as JSON", SvPV_nolen(val));
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ctx->depth++;
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} else if (!SvOK(val)) {
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fustr_write(&ctx->out, "null", 4);
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} else {
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croak("unable to format unknown value '%s' as JSON", SvPV_nolen(val));
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}
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}
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static SV *fujson_fmt_xs(pTHX_ I32 ax, I32 argc, SV *val) {
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I32 i = 1;
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int encutf8 = 0;
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char *arg;
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SV *r;
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fujson_fmt_ctx ctx;
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ctx.out.maxlen = 0;
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ctx.depth = 0;
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while (i < argc) {
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arg = SvPV_nolen(ST(i));
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i++;
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if (i == argc) croak("Odd name/value argument for json_format()");
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r = ST(i);
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i++;
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if (strcmp(arg, "utf8") == 0) encutf8 = SvPVXtrue(r);
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else if (strcmp(arg, "max_size") == 0) ctx.out.maxlen = SvUV(r);
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else if (strcmp(arg, "max_depth") == 0) ctx.depth = SvUV(r);
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else croak("Unknown flag: '%s'", arg);
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}
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if (ctx.out.maxlen == 0) ctx.out.maxlen = 1<<30;
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if (ctx.depth == 0) ctx.depth = 512;
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fustr_init(&ctx.out, 128, ctx.out.maxlen);
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fujson_fmt(aTHX_ &ctx, val);
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r = fustr_done(&ctx.out);
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if (!encutf8) SvUTF8_on(r);
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return r;
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}
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/* TODO: canonical */
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/* TODO: pretty */
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