DUK_EXTERNAL void duk_dump_function(duk_context *ctx) {
duk_hthread *thr;
duk_hcompiledfunction *func;
duk_bufwriter_ctx bw_ctx_alloc;
duk_bufwriter_ctx *bw_ctx = &bw_ctx_alloc;
duk_uint8_t *p;
DUK_ASSERT(ctx != NULL);
thr = (duk_hthread *) ctx;
/* Bound functions don't have all properties so we'd either need to
* lookup the non-bound target function or reject bound functions.
* For now, bound functions are rejected.
*/
func = duk_require_hcompiledfunction(ctx, -1);
DUK_ASSERT(func != NULL);
DUK_ASSERT(!DUK_HOBJECT_HAS_BOUND(&func->obj));
/* Estimating the result size beforehand would be costly, so
* start with a reasonable size and extend as needed.
*/
DUK_BW_INIT_PUSHBUF(thr, bw_ctx, DUK__BYTECODE_INITIAL_ALLOC);
p = DUK_BW_GET_PTR(thr, bw_ctx);
*p++ = DUK__SER_MARKER;
*p++ = DUK__SER_VERSION;
p = duk__dump_func(ctx, func, bw_ctx, p);
DUK_BW_SET_PTR(thr, bw_ctx, p);
DUK_BW_COMPACT(thr, bw_ctx);
DUK_DD(DUK_DDPRINT("serialized result: %!T", duk_get_tval(ctx, -1)));
duk_remove(ctx, -2); /* [ ... func buf ] -> [ ... buf ] */
}
DUK_LOCAL duk_ret_t duk__construct_from_codepoints(duk_context *ctx, duk_bool_t nonbmp) {
duk_hthread *thr = (duk_hthread *) ctx;
duk_bufwriter_ctx bw_alloc;
duk_bufwriter_ctx *bw;
duk_idx_t i, n;
duk_ucodepoint_t cp;
/* XXX: It would be nice to build the string directly but ToUint16()
* coercion is needed so a generic helper would not be very
* helpful (perhaps coerce the value stack first here and then
* build a string from a duk_tval number sequence in one go?).
*/
n = duk_get_top(ctx);
bw = &bw_alloc;
DUK_BW_INIT_PUSHBUF(thr, bw, n); /* initial estimate for ASCII only codepoints */
for (i = 0; i < n; i++) {
/* XXX: could improve bufwriter handling to write multiple codepoints
* with one ensure call but the relative benefit would be quite small.
*/
if (nonbmp) {
/* ES6 requires that (1) SameValue(cp, ToInteger(cp)) and
* (2) cp >= 0 and cp <= 0x10ffff. This check does not
* implement the steps exactly but the outcome should be
* the same.
*/
duk_int32_t i32 = 0;
if (!duk_is_whole_get_int32(duk_to_number(ctx, i), &i32) ||
i32 < 0 || i32 > 0x10ffffL) {
DUK_DCERROR_RANGE_INVALID_ARGS((duk_hthread *) ctx);
}
cp = (duk_ucodepoint_t) i32;
DUK_ASSERT(cp >= 0 && cp <= 0x10ffffL);
DUK_BW_WRITE_ENSURE_CESU8(thr, bw, cp);
} else {
#if defined(DUK_USE_NONSTD_STRING_FROMCHARCODE_32BIT)
/* ToUint16() coercion is mandatory in the E5.1 specification, but
* this non-compliant behavior makes more sense because we support
* non-BMP codepoints. Don't use CESU-8 because that'd create
* surrogate pairs.
*/
cp = (duk_ucodepoint_t) duk_to_uint32(ctx, i);
DUK_BW_WRITE_ENSURE_XUTF8(thr, bw, cp);
#else
cp = (duk_ucodepoint_t) duk_to_uint16(ctx, i);
DUK_ASSERT(cp >= 0 && cp <= 0x10ffffL);
DUK_BW_WRITE_ENSURE_CESU8(thr, bw, cp);
#endif
}
}
DUK_BW_COMPACT(thr, bw);
(void) duk_buffer_to_string(ctx, -1);
return 1;
}
DUK_LOCAL void duk__create_escaped_source(duk_hthread *thr, int idx_pattern) {
duk_context *ctx = (duk_context *) thr;
duk_hstring *h;
const duk_uint8_t *p;
duk_bufwriter_ctx bw_alloc;
duk_bufwriter_ctx *bw;
duk_uint8_t *q;
duk_size_t i, n;
duk_uint_fast8_t c_prev, c;
h = duk_get_hstring(ctx, idx_pattern);
DUK_ASSERT(h != NULL);
p = (const duk_uint8_t *) DUK_HSTRING_GET_DATA(h);
n = (duk_size_t) DUK_HSTRING_GET_BYTELEN(h);
if (n == 0) {
/* return '(?:)' */
duk_push_hstring_stridx(ctx, DUK_STRIDX_ESCAPED_EMPTY_REGEXP);
return;
}
bw = &bw_alloc;
DUK_BW_INIT_PUSHBUF(thr, bw, n);
q = DUK_BW_GET_PTR(thr, bw);
c_prev = (duk_uint_fast8_t) 0;
for (i = 0; i < n; i++) {
c = p[i];
q = DUK_BW_ENSURE_RAW(thr, bw, 2, q);
if (c == (duk_uint_fast8_t) '/' && c_prev != (duk_uint_fast8_t) '\\') {
/* Unescaped '/' ANYWHERE in the regexp (in disjunction,
* inside a character class, ...) => same escape works.
*/
*q++ = DUK_ASC_BACKSLASH;
}
*q++ = (duk_uint8_t) c;
c_prev = c;
}
DUK_BW_SETPTR_AND_COMPACT(thr, bw, q);
duk_to_string(ctx, -1); /* -> [ ... escaped_source ] */
}
DUK_INTERNAL duk_ret_t duk_bi_string_constructor_from_char_code(duk_context *ctx) {
duk_hthread *thr = (duk_hthread *) ctx;
duk_bufwriter_ctx bw_alloc;
duk_bufwriter_ctx *bw;
duk_idx_t i, n;
duk_ucodepoint_t cp;
/* XXX: It would be nice to build the string directly but ToUint16()
* coercion is needed so a generic helper would not be very
* helpful (perhaps coerce the value stack first here and then
* build a string from a duk_tval number sequence in one go?).
*/
n = duk_get_top(ctx);
bw = &bw_alloc;
DUK_BW_INIT_PUSHBUF(thr, bw, n); /* initial estimate for ASCII only codepoints */
for (i = 0; i < n; i++) {
/* XXX: could improve bufwriter handling to write multiple codepoints
* with one ensure call but the relative benefit would be quite small.
*/
#if defined(DUK_USE_NONSTD_STRING_FROMCHARCODE_32BIT)
/* ToUint16() coercion is mandatory in the E5.1 specification, but
* this non-compliant behavior makes more sense because we support
* non-BMP codepoints. Don't use CESU-8 because that'd create
* surrogate pairs.
*/
cp = (duk_ucodepoint_t) duk_to_uint32(ctx, i);
DUK_BW_WRITE_ENSURE_XUTF8(thr, bw, cp);
#else
cp = (duk_ucodepoint_t) duk_to_uint32(ctx, i);
DUK_BW_WRITE_ENSURE_CESU8(thr, bw, cp);
#endif
}
DUK_BW_COMPACT(thr, bw);
duk_to_string(ctx, -1);
return 1;
}
DUK_INTERNAL void duk_regexp_compile(duk_hthread *thr) {
duk_context *ctx = (duk_context *) thr;
duk_re_compiler_ctx re_ctx;
duk_lexer_point lex_point;
duk_hstring *h_pattern;
duk_hstring *h_flags;
duk__re_disjunction_info ign_disj;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(ctx != NULL);
/*
* Args validation
*/
/* TypeError if fails */
h_pattern = duk_require_hstring(ctx, -2);
h_flags = duk_require_hstring(ctx, -1);
/*
* Create normalized 'source' property (E5 Section 15.10.3).
*/
/* [ ... pattern flags ] */
duk__create_escaped_source(thr, -2);
/* [ ... pattern flags escaped_source ] */
/*
* Init compilation context
*/
/* [ ... pattern flags escaped_source buffer ] */
DUK_MEMZERO(&re_ctx, sizeof(re_ctx));
DUK_LEXER_INITCTX(&re_ctx.lex); /* duplicate zeroing, expect for (possible) NULL inits */
re_ctx.thr = thr;
re_ctx.lex.thr = thr;
re_ctx.lex.input = DUK_HSTRING_GET_DATA(h_pattern);
re_ctx.lex.input_length = DUK_HSTRING_GET_BYTELEN(h_pattern);
re_ctx.lex.token_limit = DUK_RE_COMPILE_TOKEN_LIMIT;
re_ctx.recursion_limit = DUK_USE_REGEXP_COMPILER_RECLIMIT;
re_ctx.re_flags = duk__parse_regexp_flags(thr, h_flags);
DUK_BW_INIT_PUSHBUF(thr, &re_ctx.bw, DUK__RE_INITIAL_BUFSIZE);
DUK_DD(DUK_DDPRINT("regexp compiler ctx initialized, flags=0x%08lx, recursion_limit=%ld",
(unsigned long) re_ctx.re_flags, (long) re_ctx.recursion_limit));
/*
* Init lexer
*/
lex_point.offset = 0; /* expensive init, just want to fill window */
lex_point.line = 1;
DUK_LEXER_SETPOINT(&re_ctx.lex, &lex_point);
/*
* Compilation
*/
DUK_DD(DUK_DDPRINT("starting regexp compilation"));
duk__append_u32(&re_ctx, DUK_REOP_SAVE);
duk__append_u32(&re_ctx, 0);
duk__parse_disjunction(&re_ctx, 1 /*expect_eof*/, &ign_disj);
duk__append_u32(&re_ctx, DUK_REOP_SAVE);
duk__append_u32(&re_ctx, 1);
duk__append_u32(&re_ctx, DUK_REOP_MATCH);
/*
* Check for invalid backreferences; note that it is NOT an error
* to back-reference a capture group which has not yet been introduced
* in the pattern (as in /\1(foo)/); in fact, the backreference will
* always match! It IS an error to back-reference a capture group
* which will never be introduced in the pattern. Thus, we can check
* for such references only after parsing is complete.
*/
if (re_ctx.highest_backref > re_ctx.captures) {
DUK_ERROR_SYNTAX(thr, DUK_STR_INVALID_BACKREFS);
}
/*
* Emit compiled regexp header: flags, ncaptures
* (insertion order inverted on purpose)
*/
duk__insert_u32(&re_ctx, 0, (re_ctx.captures + 1) * 2);
duk__insert_u32(&re_ctx, 0, re_ctx.re_flags);
/* [ ... pattern flags escaped_source buffer ] */
DUK_BW_COMPACT(thr, &re_ctx.bw);
duk_to_string(ctx, -1); /* coerce to string */
/* [ ... pattern flags escaped_source bytecode ] */
/*
* Finalize stack
*/
duk_remove(ctx, -4); /* -> [ ... flags escaped_source bytecode ] */
duk_remove(ctx, -3); /* -> [ ... escaped_source bytecode ] */
DUK_DD(DUK_DDPRINT("regexp compilation successful, bytecode: %!T, escaped source: %!T",
(duk_tval *) duk_get_tval(ctx, -1), (duk_tval *) duk_get_tval(ctx, -2)));
}
DUK_INTERNAL duk_ret_t duk_bi_string_prototype_replace(duk_context *ctx) {
duk_hthread *thr = (duk_hthread *) ctx;
duk_hstring *h_input;
duk_hstring *h_match;
duk_hstring *h_search;
duk_hobject *h_re;
duk_bufwriter_ctx bw_alloc;
duk_bufwriter_ctx *bw;
#ifdef DUK_USE_REGEXP_SUPPORT
duk_bool_t is_regexp;
duk_bool_t is_global;
#endif
duk_bool_t is_repl_func;
duk_uint32_t match_start_coff, match_start_boff;
#ifdef DUK_USE_REGEXP_SUPPORT
duk_int_t match_caps;
#endif
duk_uint32_t prev_match_end_boff;
const duk_uint8_t *r_start, *r_end, *r; /* repl string scan */
duk_size_t tmp_sz;
DUK_ASSERT_TOP(ctx, 2);
h_input = duk_push_this_coercible_to_string(ctx);
DUK_ASSERT(h_input != NULL);
bw = &bw_alloc;
DUK_BW_INIT_PUSHBUF(thr, bw, DUK_HSTRING_GET_BYTELEN(h_input)); /* input size is good output starting point */
DUK_ASSERT_TOP(ctx, 4);
/* stack[0] = search value
* stack[1] = replace value
* stack[2] = input string
* stack[3] = result buffer
*/
h_re = duk_get_hobject_with_class(ctx, 0, DUK_HOBJECT_CLASS_REGEXP);
if (h_re) {
#ifdef DUK_USE_REGEXP_SUPPORT
is_regexp = 1;
is_global = duk_get_prop_stridx_boolean(ctx, 0, DUK_STRIDX_GLOBAL, NULL);
if (is_global) {
/* start match from beginning */
duk_push_int(ctx, 0);
duk_put_prop_stridx(ctx, 0, DUK_STRIDX_LAST_INDEX);
}
#else /* DUK_USE_REGEXP_SUPPORT */
return DUK_RET_UNSUPPORTED_ERROR;
#endif /* DUK_USE_REGEXP_SUPPORT */
} else {
duk_to_string(ctx, 0);
#ifdef DUK_USE_REGEXP_SUPPORT
is_regexp = 0;
is_global = 0;
#endif
}
if (duk_is_function(ctx, 1)) {
is_repl_func = 1;
r_start = NULL;
r_end = NULL;
} else {
duk_hstring *h_repl;
is_repl_func = 0;
h_repl = duk_to_hstring(ctx, 1);
DUK_ASSERT(h_repl != NULL);
r_start = DUK_HSTRING_GET_DATA(h_repl);
r_end = r_start + DUK_HSTRING_GET_BYTELEN(h_repl);
}
prev_match_end_boff = 0;
for (;;) {
/*
* If matching with a regexp:
* - non-global RegExp: lastIndex not touched on a match, zeroed
* on a non-match
* - global RegExp: on match, lastIndex will be updated by regexp
* executor to point to next char after the matching part (so that
* characters in the matching part are not matched again)
*
* If matching with a string:
* - always non-global match, find first occurrence
*
* We need:
* - The character offset of start-of-match for the replacer function
* - The byte offsets for start-of-match and end-of-match to implement
* the replacement values $&, $`, and $', and to copy non-matching
* input string portions (including header and trailer) verbatim.
*
* NOTE: the E5.1 specification is a bit vague how the RegExp should
* behave in the replacement process; e.g. is matching done first for
* all matches (in the global RegExp case) before any replacer calls
* are made? See: test-bi-string-proto-replace.js for discussion.
*/
DUK_ASSERT_TOP(ctx, 4);
#ifdef DUK_USE_REGEXP_SUPPORT
if (is_regexp) {
duk_dup(ctx, 0);
duk_dup(ctx, 2);
duk_regexp_match(thr); /* [ ... regexp input ] -> [ res_obj ] */
if (!duk_is_object(ctx, -1)) {
duk_pop(ctx);
break;
}
duk_get_prop_stridx(ctx, -1, DUK_STRIDX_INDEX);
DUK_ASSERT(duk_is_number(ctx, -1));
match_start_coff = duk_get_int(ctx, -1);
duk_pop(ctx);
duk_get_prop_index(ctx, -1, 0);
DUK_ASSERT(duk_is_string(ctx, -1));
h_match = duk_get_hstring(ctx, -1);
DUK_ASSERT(h_match != NULL);
duk_pop(ctx); /* h_match is borrowed, remains reachable through match_obj */
if (DUK_HSTRING_GET_BYTELEN(h_match) == 0) {
/* This should be equivalent to match() algorithm step 8.f.iii.2:
* detect an empty match and allow it, but don't allow it twice.
*/
duk_uint32_t last_index;
duk_get_prop_stridx(ctx, 0, DUK_STRIDX_LAST_INDEX);
last_index = (duk_uint32_t) duk_get_uint(ctx, -1);
DUK_DDD(DUK_DDDPRINT("empty match, bump lastIndex: %ld -> %ld",
(long) last_index, (long) (last_index + 1)));
duk_pop(ctx);
duk_push_int(ctx, last_index + 1);
duk_put_prop_stridx(ctx, 0, DUK_STRIDX_LAST_INDEX);
}
DUK_ASSERT(duk_get_length(ctx, -1) <= DUK_INT_MAX); /* string limits */
match_caps = (duk_int_t) duk_get_length(ctx, -1);
} else {
#else /* DUK_USE_REGEXP_SUPPORT */
{ /* unconditionally */
#endif /* DUK_USE_REGEXP_SUPPORT */
const duk_uint8_t *p_start, *p_end, *p; /* input string scan */
const duk_uint8_t *q_start; /* match string */
duk_size_t q_blen;
#ifdef DUK_USE_REGEXP_SUPPORT
DUK_ASSERT(!is_global); /* single match always */
#endif
p_start = DUK_HSTRING_GET_DATA(h_input);
p_end = p_start + DUK_HSTRING_GET_BYTELEN(h_input);
p = p_start;
h_search = duk_get_hstring(ctx, 0);
DUK_ASSERT(h_search != NULL);
q_start = DUK_HSTRING_GET_DATA(h_search);
q_blen = (duk_size_t) DUK_HSTRING_GET_BYTELEN(h_search);
p_end -= q_blen; /* ensure full memcmp() fits in while */
match_start_coff = 0;
while (p <= p_end) {
DUK_ASSERT(p + q_blen <= DUK_HSTRING_GET_DATA(h_input) + DUK_HSTRING_GET_BYTELEN(h_input));
if (DUK_MEMCMP((void *) p, (void *) q_start, (size_t) q_blen) == 0) {
duk_dup(ctx, 0);
h_match = duk_get_hstring(ctx, -1);
DUK_ASSERT(h_match != NULL);
#ifdef DUK_USE_REGEXP_SUPPORT
match_caps = 0;
#endif
goto found;
}
/* track utf-8 non-continuation bytes */
if ((p[0] & 0xc0) != 0x80) {
match_start_coff++;
}
p++;
}
/* not found */
break;
}
found:
/* stack[0] = search value
* stack[1] = replace value
* stack[2] = input string
* stack[3] = result buffer
* stack[4] = regexp match OR match string
*/
match_start_boff = duk_heap_strcache_offset_char2byte(thr, h_input, match_start_coff);
tmp_sz = (duk_size_t) (match_start_boff - prev_match_end_boff);
DUK_BW_WRITE_ENSURE_BYTES(thr, bw, DUK_HSTRING_GET_DATA(h_input) + prev_match_end_boff, tmp_sz);
prev_match_end_boff = match_start_boff + DUK_HSTRING_GET_BYTELEN(h_match);
if (is_repl_func) {
duk_idx_t idx_args;
duk_hstring *h_repl;
/* regexp res_obj is at index 4 */
duk_dup(ctx, 1);
idx_args = duk_get_top(ctx);
#ifdef DUK_USE_REGEXP_SUPPORT
if (is_regexp) {
duk_int_t idx;
duk_require_stack(ctx, match_caps + 2);
for (idx = 0; idx < match_caps; idx++) {
/* match followed by capture(s) */
duk_get_prop_index(ctx, 4, idx);
}
} else {
#else /* DUK_USE_REGEXP_SUPPORT */
{ /* unconditionally */
#endif /* DUK_USE_REGEXP_SUPPORT */
/* match == search string, by definition */
duk_dup(ctx, 0);
}
duk_push_int(ctx, match_start_coff);
duk_dup(ctx, 2);
/* [ ... replacer match [captures] match_char_offset input ] */
duk_call(ctx, duk_get_top(ctx) - idx_args);
h_repl = duk_to_hstring(ctx, -1); /* -> [ ... repl_value ] */
DUK_ASSERT(h_repl != NULL);
DUK_BW_WRITE_ENSURE_HSTRING(thr, bw, h_repl);
duk_pop(ctx); /* repl_value */
} else {
r = r_start;
while (r < r_end) {
duk_int_t ch1;
duk_int_t ch2;
#ifdef DUK_USE_REGEXP_SUPPORT
duk_int_t ch3;
#endif
duk_size_t left;
ch1 = *r++;
if (ch1 != DUK_ASC_DOLLAR) {
goto repl_write;
}
left = r_end - r;
if (left <= 0) {
goto repl_write;
}
ch2 = r[0];
switch ((int) ch2) {
case DUK_ASC_DOLLAR: {
ch1 = (1 << 8) + DUK_ASC_DOLLAR;
goto repl_write;
}
case DUK_ASC_AMP: {
DUK_BW_WRITE_ENSURE_HSTRING(thr, bw, h_match);
r++;
continue;
}
case DUK_ASC_GRAVE: {
tmp_sz = (duk_size_t) match_start_boff;
DUK_BW_WRITE_ENSURE_BYTES(thr, bw, DUK_HSTRING_GET_DATA(h_input), tmp_sz);
r++;
continue;
}
case DUK_ASC_SINGLEQUOTE: {
duk_uint32_t match_end_boff;
/* Use match charlen instead of bytelen, just in case the input and
* match codepoint encodings would have different lengths.
*/
match_end_boff = duk_heap_strcache_offset_char2byte(thr,
h_input,
match_start_coff + DUK_HSTRING_GET_CHARLEN(h_match));
tmp_sz = (duk_size_t) (DUK_HSTRING_GET_BYTELEN(h_input) - match_end_boff);
DUK_BW_WRITE_ENSURE_BYTES(thr, bw, DUK_HSTRING_GET_DATA(h_input) + match_end_boff, tmp_sz);
r++;
continue;
}
default: {
#ifdef DUK_USE_REGEXP_SUPPORT
duk_int_t capnum, captmp, capadv;
/* XXX: optional check, match_caps is zero if no regexp,
* so dollar will be interpreted literally anyway.
*/
if (!is_regexp) {
goto repl_write;
}
if (!(ch2 >= DUK_ASC_0 && ch2 <= DUK_ASC_9)) {
goto repl_write;
}
capnum = ch2 - DUK_ASC_0;
capadv = 1;
if (left >= 2) {
ch3 = r[1];
if (ch3 >= DUK_ASC_0 && ch3 <= DUK_ASC_9) {
captmp = capnum * 10 + (ch3 - DUK_ASC_0);
if (captmp < match_caps) {
capnum = captmp;
capadv = 2;
}
}
}
if (capnum > 0 && capnum < match_caps) {
DUK_ASSERT(is_regexp != 0); /* match_caps == 0 without regexps */
/* regexp res_obj is at offset 4 */
duk_get_prop_index(ctx, 4, (duk_uarridx_t) capnum);
if (duk_is_string(ctx, -1)) {
duk_hstring *h_tmp_str;
h_tmp_str = duk_get_hstring(ctx, -1);
DUK_ASSERT(h_tmp_str != NULL);
DUK_BW_WRITE_ENSURE_HSTRING(thr, bw, h_tmp_str);
} else {
/* undefined -> skip (replaced with empty) */
}
duk_pop(ctx);
r += capadv;
continue;
} else {
goto repl_write;
}
#else /* DUK_USE_REGEXP_SUPPORT */
goto repl_write; /* unconditionally */
#endif /* DUK_USE_REGEXP_SUPPORT */
} /* default case */
} /* switch (ch2) */
repl_write:
/* ch1 = (r_increment << 8) + byte */
DUK_BW_WRITE_ENSURE_U8(thr, bw, (duk_uint8_t) (ch1 & 0xff));
r += ch1 >> 8;
} /* while repl */
} /* if (is_repl_func) */
duk_pop(ctx); /* pop regexp res_obj or match string */
#ifdef DUK_USE_REGEXP_SUPPORT
if (!is_global) {
#else
{ /* unconditionally; is_global==0 */
#endif
break;
}
}
/* trailer */
tmp_sz = (duk_size_t) (DUK_HSTRING_GET_BYTELEN(h_input) - prev_match_end_boff);
DUK_BW_WRITE_ENSURE_BYTES(thr, bw, DUK_HSTRING_GET_DATA(h_input) + prev_match_end_boff, tmp_sz);
DUK_ASSERT_TOP(ctx, 4);
DUK_BW_COMPACT(thr, bw);
duk_to_string(ctx, -1);
return 1;
}
/*
* split()
*/
/* XXX: very messy now, but works; clean up, remove unused variables (nomimally
* used so compiler doesn't complain).
*/
DUK_INTERNAL duk_ret_t duk_bi_string_prototype_split(duk_context *ctx) {
duk_hthread *thr = (duk_hthread *) ctx;
duk_hstring *h_input;
duk_hstring *h_sep;
duk_uint32_t limit;
duk_uint32_t arr_idx;
#ifdef DUK_USE_REGEXP_SUPPORT
duk_bool_t is_regexp;
#endif
duk_bool_t matched; /* set to 1 if any match exists (needed for empty input special case) */
duk_uint32_t prev_match_end_coff, prev_match_end_boff;
duk_uint32_t match_start_boff, match_start_coff;
duk_uint32_t match_end_boff, match_end_coff;
DUK_UNREF(thr);
h_input = duk_push_this_coercible_to_string(ctx);
DUK_ASSERT(h_input != NULL);
duk_push_array(ctx);
if (duk_is_undefined(ctx, 1)) {
limit = 0xffffffffUL;
} else {
limit = duk_to_uint32(ctx, 1);
}
if (limit == 0) {
return 1;
}
/* If the separator is a RegExp, make a "clone" of it. The specification
* algorithm calls [[Match]] directly for specific indices; we emulate this
* by tweaking lastIndex and using a "force global" variant of duk_regexp_match()
* which will use global-style matching even when the RegExp itself is non-global.
*/
if (duk_is_undefined(ctx, 0)) {
/* The spec algorithm first does "R = ToString(separator)" before checking
* whether separator is undefined. Since this is side effect free, we can
* skip the ToString() here.
*/
duk_dup(ctx, 2);
duk_put_prop_index(ctx, 3, 0);
return 1;
} else if (duk_get_hobject_with_class(ctx, 0, DUK_HOBJECT_CLASS_REGEXP) != NULL) {
#ifdef DUK_USE_REGEXP_SUPPORT
duk_push_hobject_bidx(ctx, DUK_BIDX_REGEXP_CONSTRUCTOR);
duk_dup(ctx, 0);
duk_new(ctx, 1); /* [ ... RegExp val ] -> [ ... res ] */
duk_replace(ctx, 0);
/* lastIndex is initialized to zero by new RegExp() */
is_regexp = 1;
#else
return DUK_RET_UNSUPPORTED_ERROR;
#endif
} else {
duk_to_string(ctx, 0);
#ifdef DUK_USE_REGEXP_SUPPORT
is_regexp = 0;
#endif
}
/* stack[0] = separator (string or regexp)
* stack[1] = limit
* stack[2] = input string
* stack[3] = result array
*/
prev_match_end_boff = 0;
prev_match_end_coff = 0;
arr_idx = 0;
matched = 0;
for (;;) {
/*
* The specification uses RegExp [[Match]] to attempt match at specific
* offsets. We don't have such a primitive, so we use an actual RegExp
* and tweak lastIndex. Since the RegExp may be non-global, we use a
* special variant which forces global-like behavior for matching.
*/
DUK_ASSERT_TOP(ctx, 4);
#ifdef DUK_USE_REGEXP_SUPPORT
if (is_regexp) {
duk_dup(ctx, 0);
duk_dup(ctx, 2);
duk_regexp_match_force_global(thr); /* [ ... regexp input ] -> [ res_obj ] */
if (!duk_is_object(ctx, -1)) {
duk_pop(ctx);
break;
}
matched = 1;
duk_get_prop_stridx(ctx, -1, DUK_STRIDX_INDEX);
DUK_ASSERT(duk_is_number(ctx, -1));
match_start_coff = duk_get_int(ctx, -1);
match_start_boff = duk_heap_strcache_offset_char2byte(thr, h_input, match_start_coff);
duk_pop(ctx);
if (match_start_coff == DUK_HSTRING_GET_CHARLEN(h_input)) {
/* don't allow an empty match at the end of the string */
duk_pop(ctx);
break;
}
duk_get_prop_stridx(ctx, 0, DUK_STRIDX_LAST_INDEX);
DUK_ASSERT(duk_is_number(ctx, -1));
match_end_coff = duk_get_int(ctx, -1);
match_end_boff = duk_heap_strcache_offset_char2byte(thr, h_input, match_end_coff);
duk_pop(ctx);
/* empty match -> bump and continue */
if (prev_match_end_boff == match_end_boff) {
duk_push_int(ctx, match_end_coff + 1);
duk_put_prop_stridx(ctx, 0, DUK_STRIDX_LAST_INDEX);
duk_pop(ctx);
continue;
}
} else {
#else /* DUK_USE_REGEXP_SUPPORT */
{ /* unconditionally */
#endif /* DUK_USE_REGEXP_SUPPORT */
const duk_uint8_t *p_start, *p_end, *p; /* input string scan */
const duk_uint8_t *q_start; /* match string */
duk_size_t q_blen, q_clen;
p_start = DUK_HSTRING_GET_DATA(h_input);
p_end = p_start + DUK_HSTRING_GET_BYTELEN(h_input);
p = p_start + prev_match_end_boff;
h_sep = duk_get_hstring(ctx, 0);
DUK_ASSERT(h_sep != NULL);
q_start = DUK_HSTRING_GET_DATA(h_sep);
q_blen = (duk_size_t) DUK_HSTRING_GET_BYTELEN(h_sep);
q_clen = (duk_size_t) DUK_HSTRING_GET_CHARLEN(h_sep);
p_end -= q_blen; /* ensure full memcmp() fits in while */
match_start_coff = prev_match_end_coff;
if (q_blen == 0) {
/* Handle empty separator case: it will always match, and always
* triggers the check in step 13.c.iii initially. Note that we
* must skip to either end of string or start of first codepoint,
* skipping over any continuation bytes!
*
* Don't allow an empty string to match at the end of the input.
*/
matched = 1; /* empty separator can always match */
match_start_coff++;
p++;
while (p < p_end) {
if ((p[0] & 0xc0) != 0x80) {
goto found;
}
p++;
}
goto not_found;
}
DUK_ASSERT(q_blen > 0 && q_clen > 0);
while (p <= p_end) {
DUK_ASSERT(p + q_blen <= DUK_HSTRING_GET_DATA(h_input) + DUK_HSTRING_GET_BYTELEN(h_input));
DUK_ASSERT(q_blen > 0); /* no issues with empty memcmp() */
if (DUK_MEMCMP((void *) p, (void *) q_start, (duk_size_t) q_blen) == 0) {
/* never an empty match, so step 13.c.iii can't be triggered */
goto found;
}
/* track utf-8 non-continuation bytes */
if ((p[0] & 0xc0) != 0x80) {
match_start_coff++;
}
p++;
}
not_found:
/* not found */
break;
found:
matched = 1;
match_start_boff = (duk_uint32_t) (p - p_start);
match_end_coff = (duk_uint32_t) (match_start_coff + q_clen); /* constrained by string length */
match_end_boff = (duk_uint32_t) (match_start_boff + q_blen); /* ditto */
/* empty match (may happen with empty separator) -> bump and continue */
if (prev_match_end_boff == match_end_boff) {
prev_match_end_boff++;
prev_match_end_coff++;
continue;
}
} /* if (is_regexp) */
/* stack[0] = separator (string or regexp)
* stack[1] = limit
* stack[2] = input string
* stack[3] = result array
* stack[4] = regexp res_obj (if is_regexp)
*/
DUK_DDD(DUK_DDDPRINT("split; match_start b=%ld,c=%ld, match_end b=%ld,c=%ld, prev_end b=%ld,c=%ld",
(long) match_start_boff, (long) match_start_coff,
(long) match_end_boff, (long) match_end_coff,
(long) prev_match_end_boff, (long) prev_match_end_coff));
duk_push_lstring(ctx,
(const char *) (DUK_HSTRING_GET_DATA(h_input) + prev_match_end_boff),
(duk_size_t) (match_start_boff - prev_match_end_boff));
duk_put_prop_index(ctx, 3, arr_idx);
arr_idx++;
if (arr_idx >= limit) {
goto hit_limit;
}
#ifdef DUK_USE_REGEXP_SUPPORT
if (is_regexp) {
duk_size_t i, len;
len = duk_get_length(ctx, 4);
for (i = 1; i < len; i++) {
DUK_ASSERT(i <= DUK_UARRIDX_MAX); /* cannot have >4G captures */
duk_get_prop_index(ctx, 4, (duk_uarridx_t) i);
duk_put_prop_index(ctx, 3, arr_idx);
arr_idx++;
if (arr_idx >= limit) {
goto hit_limit;
}
}
duk_pop(ctx);
/* lastIndex already set up for next match */
} else {
#else /* DUK_USE_REGEXP_SUPPORT */
{ /* unconditionally */
#endif /* DUK_USE_REGEXP_SUPPORT */
/* no action */
}
prev_match_end_boff = match_end_boff;
prev_match_end_coff = match_end_coff;
continue;
} /* for */
/* Combined step 11 (empty string special case) and 14-15. */
DUK_DDD(DUK_DDDPRINT("split trailer; prev_end b=%ld,c=%ld",
(long) prev_match_end_boff, (long) prev_match_end_coff));
if (DUK_HSTRING_GET_CHARLEN(h_input) > 0 || !matched) {
/* Add trailer if:
* a) non-empty input
* b) empty input and no (zero size) match found (step 11)
*/
duk_push_lstring(ctx,
(const char *) DUK_HSTRING_GET_DATA(h_input) + prev_match_end_boff,
(duk_size_t) (DUK_HSTRING_GET_BYTELEN(h_input) - prev_match_end_boff));
duk_put_prop_index(ctx, 3, arr_idx);
/* No arr_idx update or limit check */
}
return 1;
hit_limit:
#ifdef DUK_USE_REGEXP_SUPPORT
if (is_regexp) {
duk_pop(ctx);
}
#endif
return 1;
}
/*
* Various
*/
#ifdef DUK_USE_REGEXP_SUPPORT
DUK_LOCAL void duk__to_regexp_helper(duk_context *ctx, duk_idx_t index, duk_bool_t force_new) {
duk_hobject *h;
/* Shared helper for match() steps 3-4, search() steps 3-4. */
DUK_ASSERT(index >= 0);
if (force_new) {
goto do_new;
}
h = duk_get_hobject_with_class(ctx, index, DUK_HOBJECT_CLASS_REGEXP);
if (!h) {
goto do_new;
}
return;
do_new:
duk_push_hobject_bidx(ctx, DUK_BIDX_REGEXP_CONSTRUCTOR);
duk_dup(ctx, index);
duk_new(ctx, 1); /* [ ... RegExp val ] -> [ ... res ] */
duk_replace(ctx, index);
}
#endif /* DUK_USE_REGEXP_SUPPORT */
#ifdef DUK_USE_REGEXP_SUPPORT
DUK_INTERNAL duk_ret_t duk_bi_string_prototype_search(duk_context *ctx) {
duk_hthread *thr = (duk_hthread *) ctx;
/* Easiest way to implement the search required by the specification
* is to do a RegExp test() with lastIndex forced to zero. To avoid
* side effects on the argument, "clone" the RegExp if a RegExp was
* given as input.
*
* The global flag of the RegExp should be ignored; setting lastIndex
* to zero (which happens when "cloning" the RegExp) should have an
* equivalent effect.
*/
DUK_ASSERT_TOP(ctx, 1);
(void) duk_push_this_coercible_to_string(ctx); /* at index 1 */
duk__to_regexp_helper(ctx, 0 /*index*/, 1 /*force_new*/);
/* stack[0] = regexp
* stack[1] = string
*/
/* Avoid using RegExp.prototype methods, as they're writable and
* configurable and may have been changed.
*/
duk_dup(ctx, 0);
duk_dup(ctx, 1); /* [ ... re_obj input ] */
duk_regexp_match(thr); /* -> [ ... res_obj ] */
if (!duk_is_object(ctx, -1)) {
duk_push_int(ctx, -1);
return 1;
}
duk_get_prop_stridx(ctx, -1, DUK_STRIDX_INDEX);
DUK_ASSERT(duk_is_number(ctx, -1));
return 1;
}
#else /* DUK_USE_REGEXP_SUPPORT */
DUK_INTERNAL duk_ret_t duk_bi_string_prototype_search(duk_context *ctx) {
DUK_UNREF(ctx);
return DUK_RET_UNSUPPORTED_ERROR;
}
