Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data.Entity/System/Data/SqlClient/SqlGen/SqlWriter.cs

@@ -0,0 +1,87 @@
+//---------------------------------------------------------------------
+// <copyright file="SqlWriter.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner  [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Text;
+using System.Data.SqlClient;
+using System.Data.Metadata.Edm;
+using System.Data.Common.CommandTrees;
+
+namespace System.Data.SqlClient.SqlGen
+{
+    /// <summary>
+    /// This extends StringWriter primarily to add the ability to add an indent
+    /// to each line that is written out.
+    /// </summary>
+    class SqlWriter : StringWriter
+    {
+        // We start at -1, since the first select statement will increment it to 0.
+        int indent = -1;
+        /// <summary>
+        /// The number of tabs to be added at the beginning of each new line.
+        /// </summary>
+        internal int Indent
+        {
+            get { return indent; }
+            set { indent = value; }
+        }
+
+        bool atBeginningOfLine = true;
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="b"></param>
+        public SqlWriter(StringBuilder b)
+            : base(b, System.Globalization.CultureInfo.InvariantCulture)
+            // I don't think the culture matters, but FxCop wants something
+        {
+        }
+
+        /// <summary>
+        /// Reset atBeginningofLine if we detect the newline string.
+        /// <see cref="SqlBuilder.AppendLine"/>
+        /// Add as many tabs as the value of indent if we are at the 
+        /// beginning of a line.
+        /// </summary>
+        /// <param name="value"></param>
+        public override void Write(string value)
+        {
+            if (value == "\r\n")
+            {
+                base.WriteLine();
+                atBeginningOfLine = true;
+            }
+            else
+            {
+                if (atBeginningOfLine)
+                {
+                    if (indent > 0)
+                    {
+                        base.Write(new string('\t', indent));
+                    }
+                    atBeginningOfLine = false;
+                }
+                base.Write(value);
+            }
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        public override void WriteLine()
+        {
+            base.WriteLine();
+            atBeginningOfLine = true;
+        }
+    }
+}