1 files changed, 94 insertions, 0 deletions
diff --git a/tools/Sandcastle/Source/CommandLine/Option.cs b/tools/Sandcastle/Source/CommandLine/Option.cs
new file mode 100644
index 0000000..fb9ed00
--- /dev/null
+++ b/tools/Sandcastle/Source/CommandLine/Option.cs
@@ -0,0 +1,94 @@
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//
+
+using System;
+using System.IO;
+using System.Collections.Generic;
+
+namespace Microsoft.Ddue.Tools.CommandLine {
+
+    public abstract class Option {
+
+        internal bool processed;
+
+        protected bool present;
+        protected object value;
+        private string description;
+
+        // Data Members
+
+        private string name;
+        private bool required;
+
+        // Constructors
+
+        protected Option(string name) {
+            foreach (char character in name) {
+                if (!(Char.IsLetter(character) || (character == '?'))) throw new ArgumentException("Names must consist of letters.", "name");
+            }
+            this.name = name;
+        }
+
+        protected Option(string name, string description) : this(name) {
+            this.description = description;
+        }
+
+        protected Option(string name, string description, bool required) : this(name, description) {
+            this.required = required;
+        }
+
+        public string Description {
+            get {
+                return (description);
+            }
+            set {
+                if (processed) throw new InvalidOperationException();
+                description = value;
+            }
+        }
+
+        public virtual bool IsPresent {
+            get {
+                if (!processed) throw new InvalidOperationException();
+                return (present);
+            }
+        }
+
+        public bool IsRequired {
+            get {
+                return (required);
+            }
+            set {
+                if (processed) throw new InvalidOperationException();
+                required = value;
+            }
+        }
+
+        // Accessors
+
+        public string Name {
+            get {
+                return (name);
+            }
+            set {
+                if (processed) throw new InvalidOperationException();
+                name = value;
+            }
+        }
+
+        public virtual Object Value {
+            get {
+                if (!processed) throw new InvalidOperationException();
+                return (value);
+            }
+        }
+
+        // To be implemented by children
+
+        internal abstract ParseResult ParseArgument(string args);
+
+        internal abstract void WriteTemplate(TextWriter writer);
+
+    }
+
+}