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[njs] Accessing "lastIndex" property according to the spec.

Dmitry Volyntsev
June 07, 2021 03:18PM
details: https://hg.nginx.org/njs/rev/45b9af3f911f
branches:
changeset: 1652:45b9af3f911f
user: Dmitry Volyntsev <xeioex@nginx.com>
date: Sat Jun 05 11:55:08 2021 +0000
description:
Accessing "lastIndex" property according to the spec.

diffstat:

src/njs_regexp.c | 47 ++++++++++++++++++++++++++++++++++-------------
src/test/njs_unit_test.c | 6 ++++++
2 files changed, 40 insertions(+), 13 deletions(-)

diffs (164 lines):

diff -r de64420d0f2b -r 45b9af3f911f src/njs_regexp.c
--- a/src/njs_regexp.c Sat Jun 05 11:55:08 2021 +0000
+++ b/src/njs_regexp.c Sat Jun 05 11:55:08 2021 +0000
@@ -25,13 +25,16 @@ static u_char *njs_regexp_compile_trace_
njs_trace_data_t *td, u_char *start);
static u_char *njs_regexp_match_trace_handler(njs_trace_t *trace,
njs_trace_data_t *td, u_char *start);
-static njs_array_t *njs_regexp_exec_result(njs_vm_t *vm, njs_regexp_t *regexp,
+static njs_array_t *njs_regexp_exec_result(njs_vm_t *vm, njs_value_t *r,
njs_regexp_utf8_t type, njs_string_prop_t *string,
njs_regex_match_data_t *data);
static njs_int_t njs_regexp_string_create(njs_vm_t *vm, njs_value_t *value,
u_char *start, uint32_t size, int32_t length);


+const njs_value_t njs_string_lindex = njs_string("lastIndex");
+
+
njs_int_t
njs_regexp_init(njs_vm_t *vm)
{
@@ -911,6 +914,7 @@ njs_regexp_builtin_exec(njs_vm_t *vm, nj
size_t length, offset;
int64_t last_index;
njs_int_t ret;
+ njs_value_t value;
njs_array_t *result;
njs_regexp_t *regexp;
njs_string_prop_t string;
@@ -922,7 +926,13 @@ njs_regexp_builtin_exec(njs_vm_t *vm, nj
regexp->string = *s;
pattern = regexp->pattern;

- ret = njs_value_to_length(vm, &regexp->last_index, &last_index);
+ ret = njs_value_property(vm, r, njs_value_arg(&njs_string_lindex),
+ &value);
+ if (njs_slow_path(ret == NJS_ERROR)) {
+ return NJS_ERROR;
+ }
+
+ ret = njs_value_to_length(vm, &value, &last_index);
if (njs_slow_path(ret != NJS_OK)) {
return NJS_ERROR;
}
@@ -968,7 +978,7 @@ njs_regexp_builtin_exec(njs_vm_t *vm, nj
ret = njs_regexp_match(vm, &pattern->regex[type], string.start, offset,
string.size, match_data);
if (ret >= 0) {
- result = njs_regexp_exec_result(vm, regexp, type, &string, match_data);
+ result = njs_regexp_exec_result(vm, r, type, &string, match_data);
if (njs_slow_path(result == NULL)) {
return NJS_ERROR;
}
@@ -986,7 +996,12 @@ njs_regexp_builtin_exec(njs_vm_t *vm, nj
not_found:

if (pattern->global) {
- njs_set_number(&regexp->last_index, 0);
+ njs_set_number(&value, 0);
+ ret = njs_value_property_set(vm, r, njs_value_arg(&njs_string_lindex),
+ &value);
+ if (njs_slow_path(ret != NJS_OK)) {
+ return NJS_ERROR;
+ }
}

njs_set_null(retval);
@@ -996,9 +1011,8 @@ not_found:


static njs_array_t *
-njs_regexp_exec_result(njs_vm_t *vm, njs_regexp_t *regexp,
- njs_regexp_utf8_t type, njs_string_prop_t *string,
- njs_regex_match_data_t *match_data)
+njs_regexp_exec_result(njs_vm_t *vm, njs_value_t *r, njs_regexp_utf8_t type,
+ njs_string_prop_t *string, njs_regex_match_data_t *match_data)
{
int *captures;
u_char *start;
@@ -1007,8 +1021,9 @@ njs_regexp_exec_result(njs_vm_t *vm, njs
njs_int_t ret;
njs_uint_t i, n;
njs_array_t *array;
- njs_value_t name;
+ njs_value_t name, value;
njs_object_t *groups;
+ njs_regexp_t *regexp;
njs_object_prop_t *prop;
njs_regexp_group_t *group;
njs_lvlhsh_query_t lhq;
@@ -1018,6 +1033,7 @@ njs_regexp_exec_result(njs_vm_t *vm, njs
static const njs_value_t string_input = njs_string("input");
static const njs_value_t string_groups = njs_string("groups");

+ regexp = njs_regexp(r);
pattern = regexp->pattern;
array = njs_array_alloc(vm, 0, pattern->ncaptures, 0);
if (njs_slow_path(array == NULL)) {
@@ -1074,7 +1090,12 @@ njs_regexp_exec_result(njs_vm_t *vm, njs
index = captures[1];
}

- njs_set_number(&regexp->last_index, index);
+ njs_set_number(&value, index);
+ ret = njs_value_property_set(vm, r, njs_value_arg(&njs_string_lindex),
+ &value);
+ if (njs_slow_path(ret != NJS_OK)) {
+ goto fail;
+ }
}

lhq.key_hash = NJS_INDEX_HASH;
@@ -1270,7 +1291,6 @@ njs_regexp_prototype_symbol_replace(njs_
static const njs_value_t string_global = njs_string("global");
static const njs_value_t string_groups = njs_string("groups");
static const njs_value_t string_index = njs_string("index");
- static const njs_value_t string_lindex = njs_string("lastIndex");

rx = njs_argument(args, 0);

@@ -1310,7 +1330,7 @@ njs_regexp_prototype_symbol_replace(njs_

if (global) {
njs_set_number(&value, 0);
- ret = njs_value_property_set(vm, rx, njs_value_arg(&string_lindex),
+ ret = njs_value_property_set(vm, rx, njs_value_arg(&njs_string_lindex),
&value);
if (njs_slow_path(ret != NJS_OK)) {
return NJS_ERROR;
@@ -1362,7 +1382,8 @@ njs_regexp_prototype_symbol_replace(njs_
continue;
}

- ret = njs_value_property(vm, rx, njs_value_arg(&string_lindex), &value);
+ ret = njs_value_property(vm, rx, njs_value_arg(&njs_string_lindex),
+ &value);
if (njs_slow_path(ret == NJS_ERROR)) {
goto exception;
}
@@ -1373,7 +1394,7 @@ njs_regexp_prototype_symbol_replace(njs_
}

njs_set_number(&value, last_index + 1);
- ret = njs_value_property_set(vm, rx, njs_value_arg(&string_lindex),
+ ret = njs_value_property_set(vm, rx, njs_value_arg(&njs_string_lindex),
&value);
if (njs_slow_path(ret != NJS_OK)) {
goto exception;
diff -r de64420d0f2b -r 45b9af3f911f src/test/njs_unit_test.c
--- a/src/test/njs_unit_test.c Sat Jun 05 11:55:08 2021 +0000
+++ b/src/test/njs_unit_test.c Sat Jun 05 11:55:08 2021 +0000
@@ -10797,6 +10797,12 @@ static njs_unit_test_t njs_test[] =
{ njs_str("var re = /(?:ab|cd)\\d?/g; re.lastIndex=-1; re.test('@@'); re.lastIndex"),
njs_str("0") },

+ { njs_str("var r = /a/; var gets = 0;"
+ "var counter = { valueOf: function() { gets++; return 0; } };"
+ "r.lastIndex = counter;"
+ "njs.dump([r.exec('nbc'), r.lastIndex === counter, gets])"),
+ njs_str("[null,true,1]") },
+
/*
* It seems that "/стоп/ig" fails on early PCRE versions.
* It fails at least in 8.1 and works at least in 8.31.
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[njs] Accessing "lastIndex" property according to the spec.

Dmitry Volyntsev 144 June 07, 2021 03:18PM



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