[njs] Array.prototype.fill() method.

[Andrey Zelenkov]

details:   http://hg.nginx.org/njs/rev/5c42125bd99c
branches:  
changeset: 314:5c42125bd99c
user:      Andrey Zelenkov <zelenkov at nginx.com>
date:      Fri Mar 17 18:18:01 2017 +0300
description:
Array.prototype.fill() method.

diffstat:

 njs/njs_array.c          |  72 ++++++++++++++++++++++++++++++++++++++++++++++++
 njs/test/njs_unit_test.c |  54 ++++++++++++++++++++++++++++++++++++
 2 files changed, 126 insertions(+), 0 deletions(-)

diffs (153 lines):

diff -r 243c9c96511a -r 5c42125bd99c njs/njs_array.c
--- a/njs/njs_array.c	Mon Mar 13 16:32:40 2017 +0300
+++ b/njs/njs_array.c	Fri Mar 17 18:18:01 2017 +0300
@@ -1292,6 +1292,69 @@ njs_array_prototype_every_continuation(n
 
 
 static njs_ret_t
+njs_array_prototype_fill(njs_vm_t *vm, njs_value_t *args, nxt_uint_t nargs,
+    njs_index_t unused)
+{
+    nxt_int_t    start, end, length;
+    njs_array_t  *array;
+
+    vm->retval = args[0];
+
+    if (nargs < 2 || !njs_is_array(&args[0])) {
+        return NXT_OK;
+    }
+
+    array = args[0].data.u.array;
+    length = array->length;
+
+    if (length == 0) {
+        return NXT_OK;
+    }
+
+    start = 0;
+    end = length;
+
+    if (nargs > 2) {
+        start = args[2].data.u.number;
+
+        if (start > length) {
+            start = length;
+        }
+
+        if (start < 0) {
+            start += length;
+
+            if (start < 0) {
+                start = 0;
+            }
+        }
+
+       if (nargs > 3) {
+           end = args[3].data.u.number;
+
+           if (end > length) {
+               end = length;
+           }
+
+           if (end < 0) {
+               end += length;
+
+               if (end < 0) {
+                   end = 0;
+               }
+           }
+       }
+    }
+
+    while (start < end) {
+        array->start[start++] = args[1];
+    }
+
+    return NXT_OK;
+}
+
+
+static njs_ret_t
 njs_array_prototype_filter(njs_vm_t *vm, njs_value_t *args, nxt_uint_t nargs,
     njs_index_t unused)
 {
@@ -1911,6 +1974,15 @@ static const njs_object_prop_t  njs_arra
                      njs_continuation_size(njs_array_iter_t), 0),
     },
 
+    /* ES6. */
+    {
+        .type = NJS_METHOD,
+        .name = njs_string("fill"),
+        .value = njs_native_function(njs_array_prototype_fill, 0,
+                     NJS_OBJECT_ARG, NJS_SKIP_ARG, NJS_NUMBER_ARG,
+                     NJS_NUMBER_ARG),
+    },
+
     {
         .type = NJS_METHOD,
         .name = njs_string("filter"),
diff -r 243c9c96511a -r 5c42125bd99c njs/test/njs_unit_test.c
--- a/njs/test/njs_unit_test.c	Mon Mar 13 16:32:40 2017 +0300
+++ b/njs/test/njs_unit_test.c	Fri Mar 17 18:18:01 2017 +0300
@@ -2728,6 +2728,60 @@ static njs_unit_test_t  njs_test[] =
                  "a.every(function(v, i, a) { return v > 0 })"),
       nxt_string("true") },
 
+    { nxt_string("[].fill(1);"),
+      nxt_string("") },
+
+    { nxt_string("[1,2,3].fill(5);"),
+      nxt_string("5,5,5") },
+
+    { nxt_string("[1,2,3].fill(5, 0);"),
+      nxt_string("5,5,5") },
+
+    { nxt_string("[1,2,3].fill(5, 1);"),
+      nxt_string("1,5,5") },
+
+    { nxt_string("[1,2,3].fill(5, 4);"),
+      nxt_string("1,2,3") },
+
+    { nxt_string("[1,2,3].fill(5, -2);"),
+      nxt_string("1,5,5") },
+
+    { nxt_string("[1,2,3].fill(5, -3);"),
+      nxt_string("5,5,5") },
+
+    { nxt_string("[1,2,3].fill(5, -4);"),
+      nxt_string("5,5,5") },
+
+    { nxt_string("[1,2,3].fill(5, 1, 0);"),
+      nxt_string("1,2,3") },
+
+    { nxt_string("[1,2,3].fill(5, 1, 1);"),
+      nxt_string("1,2,3") },
+
+    { nxt_string("[1,2,3].fill(5, 1, 2);"),
+      nxt_string("1,5,3") },
+
+    { nxt_string("[1,2,3].fill(5, 1, 3);"),
+      nxt_string("1,5,5") },
+
+    { nxt_string("[1,2,3].fill(5, 1, 4);"),
+      nxt_string("1,5,5") },
+
+    { nxt_string("[1,2,3].fill(5, 1, -1);"),
+      nxt_string("1,5,3") },
+
+    { nxt_string("[1,2,3].fill(5, 1, -3);"),
+      nxt_string("1,2,3") },
+
+    { nxt_string("[1,2,3].fill(5, 1, -4);"),
+      nxt_string("1,2,3") },
+
+    { nxt_string("[1,2,3].fill(\"a\", 1, 2);"),
+      nxt_string("1,a,3") },
+
+    { nxt_string("[1,2,3].fill({a:\"b\"}, 1, 2);"),
+      nxt_string("1,[object Object],3") },
+
     { nxt_string("var a = [];"
                  "a.filter(function(v, i, a) { return v > 1 })"),
       nxt_string("") },