4 files changed, 139 insertions, 0 deletions

diff --git a/src/WixToolset.Core/Preprocess/IfDefEventHandler.cs b/src/WixToolset.Core/Preprocess/IfDefEventHandler.cs
new file mode 100644
index 00000000..ff181d61
--- /dev/null
+++ b/src/WixToolset.Core/Preprocess/IfDefEventHandler.cs
@@ -0,0 +1,28 @@
+// 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.Core.Preprocess
+{
+    using System;
+    using WixToolset.Data;
+
+    public delegate void IfDefEventHandler(object sender, IfDefEventArgs e);
+
+    public class IfDefEventArgs : EventArgs
+    {
+        public IfDefEventArgs(SourceLineNumber sourceLineNumbers, bool isIfDef, bool isDefined, string variableName)
+        {
+            this.SourceLineNumbers = sourceLineNumbers;
+            this.IsIfDef = isIfDef;
+            this.IsDefined = isDefined;
+            this.VariableName = variableName;
+        }
+
+        public SourceLineNumber SourceLineNumbers { get; }
+
+        public bool IsDefined { get; }
+
+        public bool IsIfDef { get; }
+
+        public string VariableName { get; }
+    }
+}
diff --git a/src/WixToolset.Core/Preprocess/IncludedFileEventHandler.cs b/src/WixToolset.Core/Preprocess/IncludedFileEventHandler.cs
new file mode 100644
index 00000000..beba216d
--- /dev/null
+++ b/src/WixToolset.Core/Preprocess/IncludedFileEventHandler.cs
@@ -0,0 +1,43 @@
+// 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.Core.Preprocess
+{
+    using System;
+    using WixToolset.Data;
+
+    /// <summary>
+    /// Included file event handler delegate.
+    /// </summary>
+    /// <param name="sender">Sender of the message.</param>
+    /// <param name="ea">Arguments for the included file event.</param>
+    public delegate void IncludedFileEventHandler(object sender, IncludedFileEventArgs e);
+
+    /// <summary>
+    /// Event args for included file event.
+    /// </summary>
+    public class IncludedFileEventArgs : EventArgs
+    {
+        /// <summary>
+        /// Creates a new IncludedFileEventArgs.
+        /// </summary>
+        /// <param name="sourceLineNumbers">Source line numbers for the included file.</param>
+        /// <param name="fullName">The full path of the included file.</param>
+        public IncludedFileEventArgs(SourceLineNumber sourceLineNumbers, string fullName)
+        {
+            this.SourceLineNumbers = sourceLineNumbers;
+            this.FullName = fullName;
+        }
+
+        /// <summary>
+        /// Gets the full path of the included file.
+        /// </summary>
+        /// <value>The full path of the included file.</value>
+        public string FullName { get; }
+
+        /// <summary>
+        /// Gets the source line numbers.
+        /// </summary>
+        /// <value>The source line numbers.</value>
+        public SourceLineNumber SourceLineNumbers { get; }
+    }
+}
diff --git a/src/WixToolset.Core/Preprocess/ProcessedStreamEventHandler.cs b/src/WixToolset.Core/Preprocess/ProcessedStreamEventHandler.cs
new file mode 100644
index 00000000..434590d2
--- /dev/null
+++ b/src/WixToolset.Core/Preprocess/ProcessedStreamEventHandler.cs
@@ -0,0 +1,43 @@
+// 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.Core.Preprocess
+{
+    using System;
+    using System.Xml.Linq;
+
+    /// <summary>
+    /// Preprocessed output stream event handler delegate.
+    /// </summary>
+    /// <param name="sender">Sender of the message.</param>
+    /// <param name="ea">Arguments for the preprocessed stream event.</param>
+    public delegate void ProcessedStreamEventHandler(object sender, ProcessedStreamEventArgs e);
+
+    /// <summary>
+    /// Event args for preprocessed stream event.
+    /// </summary>
+    public class ProcessedStreamEventArgs : EventArgs
+    {
+        /// <summary>
+        /// Creates a new ProcessedStreamEventArgs.
+        /// </summary>
+        /// <param name="sourceFile">Source file that is preprocessed.</param>
+        /// <param name="document">Preprocessed output document.</param>
+        public ProcessedStreamEventArgs(string sourceFile, XDocument document)
+        {
+            this.SourceFile = sourceFile;
+            this.Document = document;
+        }
+
+        /// <summary>
+        /// Gets the full path of the source file.
+        /// </summary>
+        /// <value>The full path of the source file.</value>
+        public string SourceFile { get; private set; }
+
+        /// <summary>
+        /// Gets the preprocessed output stream.
+        /// </summary>
+        /// <value>The the preprocessed output stream.</value>
+        public XDocument Document { get; private set; }
+    }
+}
diff --git a/src/WixToolset.Core/Preprocess/ResolvedVariableEventHandler.cs b/src/WixToolset.Core/Preprocess/ResolvedVariableEventHandler.cs
new file mode 100644
index 00000000..df3a7e6a
--- /dev/null
+++ b/src/WixToolset.Core/Preprocess/ResolvedVariableEventHandler.cs
@@ -0,0 +1,25 @@
+// 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.Core.Preprocess
+{
+    using System;
+    using WixToolset.Data;
+
+    public delegate void ResolvedVariableEventHandler(object sender, ResolvedVariableEventArgs e);
+
+    public class ResolvedVariableEventArgs : EventArgs
+    {
+        public ResolvedVariableEventArgs(SourceLineNumber sourceLineNumbers, string variableName, string variableValue)
+        {
+            this.SourceLineNumbers = sourceLineNumbers;
+            this.VariableName = variableName;
+            this.VariableValue = variableValue;
+        }
+
+        public SourceLineNumber SourceLineNumbers { get; }
+
+        public string VariableName { get; }
+
+        public string VariableValue { get; }
+    }
+}