Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System/compmod/system/componentmodel/SyntaxCheck.cs

@@ -0,0 +1,71 @@
+//------------------------------------------------------------------------------
+// <copyright file="SyntaxCheck.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.ComponentModel {
+    using System;
+    using System.Diagnostics;
+    using System.IO;
+    using System.Runtime.InteropServices;
+    using System.Security.Permissions;
+
+    /// <internalonly/>
+    /// <devdoc>
+    ///     SyntaxCheck
+    ///     Helper class to check for path and machine name syntax.
+    /// </devdoc>
+    [HostProtection(SharedState = true)]
+    public static class SyntaxCheck {
+        /// <devdoc>
+        ///     Checks the syntax of the machine name (no "\" anywhere in it).
+        /// </devdoc>
+        /// <internalonly/>
+        public static bool CheckMachineName(string value) {
+            if (value == null) 
+                return false;
+            
+            value = value.Trim();                
+            if (value.Equals(String.Empty))
+                return false;
+                
+            // Machine names shouldn't contain any "\"
+            return (value.IndexOf('\\') == -1);
+        }
+
+        /// <devdoc>
+        ///     Checks the syntax of the path (must start with "\\").
+        /// </devdoc>
+        /// <internalonly/>
+        public static bool CheckPath(string value) {
+            if (value == null) 
+                return false;
+            
+            value = value.Trim();                
+            if (value.Equals(String.Empty))
+                return false;
+
+            // Path names should start with "\\"
+            return value.StartsWith("\\\\");
+        }
+
+        /// <devdoc>
+        ///     Checks the syntax of the path (must start with "\" or drive letter "C:").
+        ///     NOTE:  These denote a file or directory path!!
+        ///     
+        /// </devdoc>
+        /// <internalonly/>
+        public static bool CheckRootedPath(string value) {
+            if (value == null) 
+                return false;
+            
+            value = value.Trim();                
+            if (value.Equals(String.Empty))
+                return false;
+
+            // Is it rooted?
+            return Path.IsPathRooted(value);
+        }
+    }
+}