From de0f076ef9ff546c9a90513259ad6c42cd2224b3 Mon Sep 17 00:00:00 2001
From: TrueDoctor <d-kobert@web.de>
Date: Sat, 29 Sep 2018 16:51:26 +0200
Subject: added firebase api

---
 FireBase/Offline/Internals/MemberAccessVisitor.cs | 51 +++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 FireBase/Offline/Internals/MemberAccessVisitor.cs

(limited to 'FireBase/Offline/Internals/MemberAccessVisitor.cs')

diff --git a/FireBase/Offline/Internals/MemberAccessVisitor.cs b/FireBase/Offline/Internals/MemberAccessVisitor.cs
new file mode 100644
index 0000000..1f7cb11
--- /dev/null
+++ b/FireBase/Offline/Internals/MemberAccessVisitor.cs
@@ -0,0 +1,51 @@
+namespace Firebase.Database.Offline.Internals
+{
+    using System.Collections.Generic;
+    using System.Linq.Expressions;
+    using System.Reflection;
+
+    using Newtonsoft.Json;
+
+    public class MemberAccessVisitor : ExpressionVisitor
+    {
+        private readonly IList<string> propertyNames = new List<string>();
+
+        private bool wasDictionaryAccess;
+
+        public IEnumerable<string> PropertyNames => this.propertyNames;
+
+        public MemberAccessVisitor()
+        {
+        }
+
+        public override Expression Visit(Expression expr)
+        {
+            if (expr?.NodeType == ExpressionType.MemberAccess)
+            {
+                if (this.wasDictionaryAccess)
+                {
+                    this.wasDictionaryAccess = false;
+                }
+                else
+                {
+                    var memberExpr = (MemberExpression)expr;
+                    var jsonAttr = memberExpr.Member.GetCustomAttribute<JsonPropertyAttribute>();
+
+                    this.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();
+                    this.propertyNames.Add(e.DynamicInvoke().ToString());
+                    this.wasDictionaryAccess = callExpr.Arguments[0].NodeType == ExpressionType.MemberAccess;
+                }
+            }
+
+            return base.Visit(expr);
+        }
+    }
+}
-- 
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