Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Activities/System/Activities/Debugger/DocumentRange.cs

@@ -0,0 +1,55 @@
+// <copyright>
+//   Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+
+namespace System.Activities.Debugger
+{
+    using System.Diagnostics;
+
+    // Immutable, start and end always non-null.
+    [DebuggerDisplay("({Start.LineNumber.Value}:{Start.LinePosition.Value}) - ({End.LineNumber.Value}:{End.LinePosition.Value})")]
+    internal class DocumentRange : IEquatable<DocumentRange>
+    {
+        private DocumentLocation start;
+        private DocumentLocation end;
+
+        internal DocumentRange(DocumentLocation start, DocumentLocation end)
+        {
+            UnitTestUtility.Assert(start != null, "DocumentRange.Start cannot be null");
+            UnitTestUtility.Assert(end != null, "DocumentRange.End cannot be null");
+            UnitTestUtility.Assert((start.LineNumber.Value < end.LineNumber.Value) || ((start.LineNumber.Value == end.LineNumber.Value) && (start.LinePosition.Value <= end.LinePosition.Value)), "Start cannot before go after End.");
+            this.start = start;
+            this.end = end;
+        }
+
+        internal DocumentRange(int startLineNumber, int startLinePosition, int endLineNumber, int endLinePosition)
+            : this(new DocumentLocation(startLineNumber, startLinePosition), new DocumentLocation(endLineNumber, endLinePosition))
+        {
+        }
+
+        internal DocumentLocation Start
+        {
+            get { return this.start; }
+        }
+
+        internal DocumentLocation End
+        {
+            get { return this.end; }
+        }
+
+        public bool Equals(DocumentRange other)
+        {
+            if (other == null)
+            {
+                return false;
+            }
+
+            return this.Start.Equals(other.Start) && this.End.Equals(other.End);
+        }
+
+        public override int GetHashCode()
+        {
+            return this.Start.GetHashCode() ^ this.End.GetHashCode();
+        }
+    }
+}