1 files changed, 46 insertions, 0 deletions
diff --git a/dsa/FireBase/Offline/Internals/MemberAccessVisitor.cs b/dsa/FireBase/Offline/Internals/MemberAccessVisitor.cs
new file mode 100644
index 0000000..89a77da
--- /dev/null
+++ b/dsa/FireBase/Offline/Internals/MemberAccessVisitor.cs
@@ -0,0 +1,46 @@
+using System.Collections.Generic;
+using System.Linq.Expressions;
+using System.Reflection;
+using Newtonsoft.Json;
+
+namespace Firebase.Database.Offline.Internals
+{
+    public class MemberAccessVisitor : ExpressionVisitor
+    {
+        private readonly IList<string> propertyNames = new List<string>();
+
+        private bool wasDictionaryAccess;
+
+        public IEnumerable<string> PropertyNames => propertyNames;
+
+        public override Expression Visit(Expression expr)
+        {
+            if (expr?.NodeType == ExpressionType.MemberAccess)
+            {
+                if (wasDictionaryAccess)
+                {
+                    wasDictionaryAccess = false;
+                }
+                else
+                {
+                    var memberExpr = (MemberExpression) expr;
+                    var jsonAttr = memberExpr.Member.GetCustomAttribute<JsonPropertyAttribute>();
+
+                    propertyNames.Add(jsonAttr?.PropertyName ?? memberExpr.Member.Name);
+                }
+            }
+            else if (expr?.NodeType == ExpressionType.Call)
+            {
+                var callExpr = (MethodCallExpression) expr;
+                if (callExpr.Method.Name == "get_Item" && callExpr.Arguments.Count == 1)
+                {
+                    var e = Expression.Lambda(callExpr.Arguments[0]).Compile();
+                    propertyNames.Add(e.DynamicInvoke().ToString());
+                    wasDictionaryAccess = callExpr.Arguments[0].NodeType == ExpressionType.MemberAccess;
+                }
+            }
+
+            return base.Visit(expr);
+        }
+    }
+}
+\ No newline at end of file