1 files changed, 39 insertions, 0 deletions

diff --git a/src/WixToolset.BuildTasks/Common.cs b/src/WixToolset.BuildTasks/Common.cs
new file mode 100644
index 00000000..c5b709c2
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+++ b/src/WixToolset.BuildTasks/Common.cs
@@ -0,0 +1,39 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.BuildTasks
+{
+    using System;
+    using System.Text.RegularExpressions;
+
+    /// <summary>
+    /// Common WixTasks utility methods and types.
+    /// </summary>
+    public static class ToolsCommon
+    {
+        /// <summary>Metadata key name to turn off harvesting of project references.</summary>
+        public const string DoNotHarvest = "DoNotHarvest";
+
+        private static readonly Regex AddPrefix = new Regex(@"^[^a-zA-Z_]", RegexOptions.Compiled);
+        private static readonly Regex IllegalIdentifierCharacters = new Regex(@"[^A-Za-z0-9_\.]|\.{2,}", RegexOptions.Compiled); // non 'words' and assorted valid characters
+
+        /// <summary>
+        /// Return an identifier based on passed file/directory name
+        /// </summary>
+        /// <param name="name">File/directory name to generate identifer from</param>
+        /// <returns>A version of the name that is a legal identifier.</returns>
+        /// <remarks>This is duplicated from WiX's Common class.</remarks>
+        public static string GetIdentifierFromName(string name)
+        {
+            string result = IllegalIdentifierCharacters.Replace(name, "_"); // replace illegal characters with "_".
+
+            // MSI identifiers must begin with an alphabetic character or an
+            // underscore. Prefix all other values with an underscore.
+            if (AddPrefix.IsMatch(name))
+            {
+                result = String.Concat("_", result);
+            }
+
+            return result;
+        }
+    }
+}