Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/Configuration/CapabilitiesState.cs

@@ -0,0 +1,135 @@
+//------------------------------------------------------------------------------
+// <copyright file="CapabilitiesState.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.Configuration {
+    
+    using System.Collections;
+    using System.Collections.Specialized;
+    using System.Diagnostics;
+    using System.Globalization;
+    using System.Reflection;
+    using System.Security;
+    using System.Text;
+    using System.Text.RegularExpressions;
+    using System.Threading;
+    using System.Web.Caching;
+    using System.Web.Compilation;
+    using System.Web.Hosting;
+    using System.Security.Permissions;
+
+    //
+    // Encapsulates the evaluation state used in computing capabilities
+    //
+    internal class CapabilitiesState {
+        internal HttpRequest _request;
+        internal IDictionary _values;
+        internal ArrayList _matchlist;
+        internal ArrayList _regexlist;
+        internal bool _exit;
+        internal bool _evaluateOnlyUserAgent;
+
+        internal CapabilitiesState(HttpRequest request, IDictionary values) {
+            _request = request;
+            _values = values;
+            _matchlist = new ArrayList();
+            _regexlist = new ArrayList();
+        }
+
+        internal bool EvaluateOnlyUserAgent {
+            get {
+                return _evaluateOnlyUserAgent;
+            }
+            set {
+                _evaluateOnlyUserAgent = value;
+            }
+        }
+
+        internal virtual void ClearMatch() {
+            if (_matchlist == null) {
+                _regexlist = new ArrayList();
+                _matchlist = new ArrayList();
+            }
+            else {
+                _regexlist.Clear();
+                _matchlist.Clear();
+            }
+        }
+
+        internal virtual void AddMatch(DelayedRegex regex, Match match) {
+            _regexlist.Add(regex);
+            _matchlist.Add(match);
+        }
+
+        internal virtual void PopMatch() {
+            _regexlist.RemoveAt(_regexlist.Count - 1);
+            _matchlist.RemoveAt(_matchlist.Count - 1);
+        }
+
+        internal virtual String ResolveReference(String refname) {
+            if (_matchlist == null)
+                return String.Empty;
+
+            int i = _matchlist.Count;
+
+            while (i > 0) {
+                i--;
+                int groupnum = ((DelayedRegex)_regexlist[i]).GroupNumberFromName(refname);
+
+                if (groupnum >= 0) {
+                    Group group = ((Match)_matchlist[i]).Groups[groupnum];
+                    if (group.Success) {
+                        return group.ToString();
+                    }
+                }
+            }
+
+            return String.Empty;
+        }
+
+        [AspNetHostingPermission(SecurityAction.Assert, Level=AspNetHostingPermissionLevel.Low)]
+        string ResolveServerVariableWithAssert(string varname) {
+            string result = _request.ServerVariables[varname];
+            if (result == null)
+                return string.Empty;
+
+            return result;
+        }
+
+        internal virtual String ResolveServerVariable(String varname) {
+            if (varname.Length == 0 || varname == "HTTP_USER_AGENT")
+                return HttpCapabilitiesDefaultProvider.GetUserAgent(_request);
+
+            if (EvaluateOnlyUserAgent)
+                return string.Empty;
+            
+            return ResolveServerVariableWithAssert(varname);
+        }
+
+        internal virtual String ResolveVariable(String varname) {
+            String result;
+
+            result = (String)_values[varname];
+
+            if (result == null)
+                return String.Empty;
+
+            return result;
+        }
+
+        internal virtual void SetVariable(String varname, String value) {
+            _values[varname] = value;
+        }
+
+        internal virtual bool Exit {
+            get {
+                return _exit;
+            }
+            set {
+                _exit = value;
+            }
+        }
+    }
+}