From 1a2e9bfab52c8e0d602a3a6135f478b20a8e3367 Mon Sep 17 00:00:00 2001
From: Igor Sysoev <igor@sysoev.ru>
Date: Mon, 23 Nov 2015 15:35:49 +0300
Subject: [PATCH] Empty array elements support.

---
 njs/njs_parser.c         |  5 +++++
 njs/test/njs_unit_test.c | 25 +++++++++++++++++++++++--
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/njs/njs_parser.c b/njs/njs_parser.c
index 68c14c23..9136e5c7 100644
--- a/njs/njs_parser.c
+++ b/njs/njs_parser.c
@@ -1579,6 +1579,11 @@ njs_parser_array(njs_vm_t *vm, njs_parser_t *parser,
             break;
         }
 
+        if (token == NJS_TOKEN_COMMA) {
+            index++;
+            continue;
+        }
+
         node = njs_parser_node_alloc(vm);
         if (nxt_slow_path(node == NULL)) {
             return NJS_TOKEN_ERROR;
diff --git a/njs/test/njs_unit_test.c b/njs/test/njs_unit_test.c
index d41099b0..397ba19b 100644
--- a/njs/test/njs_unit_test.c
+++ b/njs/test/njs_unit_test.c
@@ -1644,6 +1644,29 @@ static njs_unit_test_t  njs_test[] =
 
     /**/
 
+    { nxt_string("[,,]"),
+      nxt_string(",") },
+
+    { nxt_string("[,,,]"),
+      nxt_string(",,") },
+
+    { nxt_string("[1,2,]"),
+      nxt_string("1,2") },
+
+    { nxt_string("[1,2,,3]"),
+      nxt_string("1,2,,3") },
+
+    { nxt_string("[,,].length"),
+      nxt_string("2") },
+
+    { nxt_string("[,,,].length"),
+      nxt_string("3") },
+
+    { nxt_string("[1,2,,3].length"),
+      nxt_string("4") },
+
+    /**/
+
     { nxt_string("var n = { toString: function() { return 1 } };   [1,2][n]"),
       nxt_string("2") },
 
@@ -1718,11 +1741,9 @@ static njs_unit_test_t  njs_test[] =
                  "a.forEach(function(v, i, a) { this.sum += v }, s); s.sum"),
       nxt_string("0") },
 
-#if 0
     { nxt_string("var a = [,,,]; var s = { sum: 0 };"
                  "a.forEach(function(v, i, a) { this.sum += v }, s); s.sum"),
       nxt_string("0") },
-#endif
 
     { nxt_string("var a = [1,2,3]; var s = { sum: 0 };"
                  "a.forEach(function(v, i, a) { this.sum += v }, s); s.sum"),
-- 
2.47.3