details: http://hg.nginx.org/njs/rev/2cc08001fc78
branches:
changeset: 227:2cc08001fc78
user: Valentin Bartenev <vbart@nginx.com>
date: Fri Oct 28 14:20:23 2016 +0300
description:
String.prototype.repeat() method.

diffstat:

njs/njs_string.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++
njs/test/njs_unit_test.c | 18 +++++++++++++++
2 files changed, 73 insertions(+), 0 deletions(-)

diffs (100 lines):

diff -r 5de122a4031a -r 2cc08001fc78 njs/njs_string.c
--- a/njs/njs_string.c Fri Oct 28 13:32:33 2016 +0300
+++ b/njs/njs_string.c Fri Oct 28 14:20:23 2016 +0300
@@ -1743,6 +1743,53 @@ done:
}


+static njs_ret_t
+njs_string_prototype_repeat(njs_vm_t *vm, njs_value_t *args, nxt_uint_t nargs,
+ njs_index_t unused)
+{
+ u_char *p, *start;
+ int32_t n, max;
+ uint32_t size, length;
+ njs_string_prop_t string;
+
+ n = 0;
+
+ (void) njs_string_prop(&string, &args[0]);
+
+ if (nargs > 1) {
+ max = NJS_STRING_MAX_LENGTH / string.size;
+ n = args[1].data.u.number;
+
+ if (nxt_slow_path(n < 0 || n > max)) {
+ vm->exception = &njs_exception_range_error;
+ return NXT_ERROR;
+ }
+ }
+
+ size = string.size * n;
+ length = string.length * n;
+
+ start = njs_string_alloc(vm, &vm->retval, size, length);
+ if (nxt_slow_path(start == NULL)) {
+ return NXT_ERROR;
+ }
+
+ p = start;
+
+ while (n != 0) {
+ p = memcpy(p, string.start, string.size);
+ p += string.size;
+ n--;
+ }
+
+ if (length >= NJS_STRING_MAP_OFFSET && size != length) {
+ njs_string_offset_map_init(start, size);
+ }
+
+ return NXT_OK;
+}
+
+
/*
* String.search([regexp])
*/
@@ -3042,6 +3089,14 @@ static const njs_object_prop_t njs_stri
NJS_STRING_OBJECT_ARG),
},

+ /* ES6. */
+ {
+ .type = NJS_METHOD,
+ .name = njs_string("repeat"),
+ .value = njs_native_function(njs_string_prototype_repeat, 0,
+ NJS_STRING_OBJECT_ARG, NJS_INTEGER_ARG),
+ },
+
{
.type = NJS_METHOD,
.name = njs_string("search"),
diff -r 5de122a4031a -r 2cc08001fc78 njs/test/njs_unit_test.c
--- a/njs/test/njs_unit_test.c Fri Oct 28 13:32:33 2016 +0300
+++ b/njs/test/njs_unit_test.c Fri Oct 28 14:20:23 2016 +0300
@@ -3611,6 +3611,24 @@ static njs_unit_test_t njs_test[] =
{ nxt_string("'0123456789'.split('').reverse().join('')"),
nxt_string("9876543210") },

+ { nxt_string("'abc'.repeat(3)"),
+ nxt_string("abcabcabc") },
+
+ { nxt_string("'абв'.repeat(3)"),
+ nxt_string("абвабвабв") },
+
+ { nxt_string("'abc'.repeat(0)"),
+ nxt_string("") },
+
+ { nxt_string("'abc'.repeat(NaN)"),
+ nxt_string("") },
+
+ { nxt_string("'abc'.repeat(Infinity)"),
+ nxt_string("RangeError") },
+
+ { nxt_string("'abc'.repeat(-1)"),
+ nxt_string("RangeError") },
+
{ nxt_string("encodeURI()"),
nxt_string("undefined")},

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