[njs] Object.seal() method.

[Dmitry Volyntsev]

details:   http://hg.nginx.org/njs/rev/cc5ab912d455
branches:  
changeset: 370:cc5ab912d455
user:      Dmitry Volyntsev <xeioex at nginx.com>
date:      Mon Jun 19 14:46:39 2017 +0300
description:
Object.seal() method.

diffstat:

 njs/njs_object.c         |  45 +++++++++++++++++++++++++++++++++++++++++++++
 njs/test/njs_unit_test.c |  21 +++++++++++++++++++++
 2 files changed, 66 insertions(+), 0 deletions(-)

diffs (93 lines):

diff -r bd6c05f66ea9 -r cc5ab912d455 njs/njs_object.c
--- a/njs/njs_object.c	Mon Jun 19 14:46:34 2017 +0300
+++ b/njs/njs_object.c	Mon Jun 19 14:46:39 2017 +0300
@@ -803,6 +803,43 @@ done:
 
 
 static njs_ret_t
+njs_object_seal(njs_vm_t *vm, njs_value_t *args, nxt_uint_t nargs,
+    njs_index_t unused)
+{
+    nxt_lvlhsh_t       *hash;
+    njs_object_t       *object;
+    njs_object_prop_t  *prop;
+    nxt_lvlhsh_each_t  lhe;
+
+    if (nargs < 2 || !njs_is_object(&args[1])) {
+        vm->exception = &njs_exception_type_error;
+        return NXT_ERROR;
+    }
+
+    object = args[1].data.u.object;
+    object->extensible = 0;
+
+    nxt_lvlhsh_each_init(&lhe, &njs_object_hash_proto);
+
+    hash = &object->hash;
+
+    for ( ;; ) {
+        prop = nxt_lvlhsh_each(hash, &lhe);
+
+        if (prop == NULL) {
+            break;
+        }
+
+        prop->configurable = 0;
+    }
+
+    vm->retval = args[1];
+
+    return NXT_OK;
+}
+
+
+static njs_ret_t
 njs_object_prevent_extensions(njs_vm_t *vm, njs_value_t *args, nxt_uint_t nargs,
     njs_index_t unused)
 {
@@ -1033,6 +1070,14 @@ static const njs_object_prop_t  njs_obje
                                      NJS_SKIP_ARG, NJS_OBJECT_ARG),
     },
 
+    /* Object.seal(). */
+    {
+        .type = NJS_METHOD,
+        .name = njs_string("seal"),
+        .value = njs_native_function(njs_object_seal, 0,
+                                     NJS_SKIP_ARG, NJS_OBJECT_ARG),
+    },
+
     /* Object.preventExtensions(). */
     {
         .type = NJS_METHOD,
diff -r bd6c05f66ea9 -r cc5ab912d455 njs/test/njs_unit_test.c
--- a/njs/test/njs_unit_test.c	Mon Jun 19 14:46:34 2017 +0300
+++ b/njs/test/njs_unit_test.c	Mon Jun 19 14:46:39 2017 +0300
@@ -6215,6 +6215,27 @@ static njs_unit_test_t  njs_test[] =
     { nxt_string("var o = Object.freeze({a:1}); Object.isFrozen(o)"),
       nxt_string("true") },
 
+    { nxt_string("var o = Object.seal({a:1}); o.a = 2; o.a"),
+      nxt_string("2") },
+
+    { nxt_string("var o = Object.seal({a:1}); delete o.a; o.a"),
+      nxt_string("1") },
+
+    { nxt_string("var o = Object.seal({a:1}); o.b = 1; o.b"),
+      nxt_string("undefined") },
+
+    { nxt_string("var o = Object.seal(Object.create({a:1})); o.a = 2; o.a"),
+      nxt_string("1") },
+
+    { nxt_string("var o = Object.seal({a:{b:1}}); o.a.b = 2; o.a.b"),
+      nxt_string("2") },
+
+    { nxt_string("Object.seal(1)"),
+      nxt_string("TypeError") },
+
+    { nxt_string("Object.seal('')"),
+      nxt_string("TypeError") },
+
     { nxt_string("var o = Object.preventExtensions({a:1});"
                  "Object.defineProperty(o, 'b', {value:1})"),
       nxt_string("TypeError") },