Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/XamlBuildTask/Microsoft/Build/Tasks/Xaml/NamespaceTable.cs

@@ -0,0 +1,96 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Xaml;
+
+namespace Microsoft.Build.Tasks.Xaml
+{
+    internal class NamespaceTable : IXamlNamespaceResolver
+    {
+        Dictionary<string, NamespaceDeclaration> tempNamespaceList = new Dictionary<string, NamespaceDeclaration>();
+        Stack<Dictionary<string, NamespaceDeclaration>> namespaceStack = new Stack<Dictionary<string, NamespaceDeclaration>>();
+        string localAssemblyName;
+
+        public NamespaceTable(string localAssemblyName)
+        {
+            this.localAssemblyName = localAssemblyName;
+        }
+
+        public IEnumerable<NamespaceDeclaration> GetNamespacePrefixes()
+        {
+            List<NamespaceDeclaration> list = new List<NamespaceDeclaration>();
+            HashSet<string> prefixSet = new HashSet<string>();
+            if (tempNamespaceList != null && tempNamespaceList.Count > 0)
+            {
+                foreach (NamespaceDeclaration ns in tempNamespaceList.Values)
+                {
+                    if (!prefixSet.Contains(ns.Prefix))
+                    {
+                        prefixSet.Add(ns.Prefix);
+                        list.Add(ns);
+                    }
+                }
+            }
+            foreach (Dictionary<string, NamespaceDeclaration> currentNamespaces in this.namespaceStack)
+            {
+                foreach (NamespaceDeclaration ns in currentNamespaces.Values)
+                {
+                    if (!prefixSet.Contains(ns.Prefix))
+                    {
+                        prefixSet.Add(ns.Prefix);
+                        list.Add(ns);
+                    }
+                }
+            }
+            return list;
+        }
+
+        public string GetNamespace(string prefix)
+        {
+            NamespaceDeclaration @namespace = null;
+            foreach (Dictionary<string, NamespaceDeclaration> currentNamespaces in this.namespaceStack)
+            {
+                if (null != currentNamespaces && currentNamespaces.TryGetValue(prefix, out @namespace))
+                {
+                    return @namespace.Namespace;
+                }
+            }
+
+            if (tempNamespaceList != null && tempNamespaceList.TryGetValue(prefix, out @namespace))
+            {
+                return @namespace.Namespace;
+            }
+
+            return @namespace.Namespace;
+        }
+
+        public void ManageNamespace(XamlReader reader)
+        {
+            switch (reader.NodeType)
+            {
+                case XamlNodeType.NamespaceDeclaration:
+                    tempNamespaceList.Add(reader.Namespace.Prefix,
+                        new NamespaceDeclaration(
+                        XamlBuildTaskServices.UpdateClrNamespaceUriWithLocalAssembly(reader.Namespace.Namespace, this.localAssemblyName),
+                        reader.Namespace.Prefix));
+                    break;
+                case XamlNodeType.StartObject:
+                case XamlNodeType.StartMember:
+                case XamlNodeType.GetObject:
+                    if (tempNamespaceList != null)
+                    {
+                        namespaceStack.Push(tempNamespaceList);
+                        tempNamespaceList = new Dictionary<string, NamespaceDeclaration>();
+                    }
+                    break;
+                case XamlNodeType.EndMember:
+                case XamlNodeType.EndObject:
+                    namespaceStack.Pop();
+                    break;
+                default:
+                    break;
+            }
+        }
+    }
+}