Fix JSONPath scanning with nested indexer (#2180)

Author: JamesNK

Src/Newtonsoft.Json.Tests/Issues/Issue2156.cs

@@ -0,0 +1,65 @@
+#region License
+// Copyright (c) 2007 James Newton-King
+//
+// Permission is hereby granted, free of charge, to any person
+// obtaining a copy of this software and associated documentation
+// files (the "Software"), to deal in the Software without
+// restriction, including without limitation the rights to use,
+// copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following
+// conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+#endregion
+
+using Newtonsoft.Json.Linq;
+using System.Linq;
+#if DNXCORE50
+using Xunit;
+using Test = Xunit.FactAttribute;
+using Assert = Newtonsoft.Json.Tests.XUnitAssert;
+#else
+using NUnit.Framework;
+#endif
+
+namespace Newtonsoft.Json.Tests.Issues
+{
+    [TestFixture]
+    public class Issue2156
+    {
+        [Test]
+        public void Test()
+        {
+            string json = @"
+            {
+                ""root"": {
+                    ""a"": {
+                        ""name"": ""John"",
+                        ""b"": {
+                            ""name"": ""Sarah""
+                        }
+                    }
+                }
+            }";
+
+            JToken t = JToken.Parse(json);
+
+            int count1 = t.SelectTokens("$..a.name").Count(); // result: 1, expected: 1
+            int count2 = t.SelectTokens("$..['a']['name']").Count(); // result: 2, expected: 1
+
+            Assert.AreEqual(1, count1);
+            Assert.AreEqual(1, count2);
+        }
+    }
+}

Src/Newtonsoft.Json/Linq/JsonPath/JPath.cs

@@ -118,6 +118,8 @@ private bool ParsePath(List<PathFilter> filters, int currentPartStartIndex, bool
                         }
 
                         filters.Add(ParseIndexer(currentChar, scan));
+                        scan = false;
+
                         _currentIndex++;
                         currentPartStartIndex = _currentIndex;
                         followingIndexer = true;