[Rgen] Allow the transformer to use the tabbed string builder. (#22020)

src/rgen/Microsoft.Macios.Generator/TabbedStringBuilder.Generator.cs

@@ -0,0 +1,22 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+using System;
+using Microsoft.Macios.Generator.Attributes;
+using ObjCRuntime;
+
+namespace Microsoft.Macios.Generator;
+
+partial class TabbedStringBuilder {
+
+	public TabbedStringBuilder AppendExportData<T> (in ExportData<T> exportData) where T : Enum
+	{
+		// Try to write the smaller amount of data. We are using the old ExportAttribute until we make the final move
+		if (exportData.ArgumentSemantic != ArgumentSemantic.None) {
+			AppendLine ($"[Export (\"{exportData.Selector}\", ArgumentSemantic.{exportData.ArgumentSemantic})]");
+		} else {
+			AppendLine ($"[Export (\"{exportData.Selector}\")]");
+		}
+		return this;
+	}
+}

src/rgen/Microsoft.Macios.Generator/TabbedStringBuilder.cs

@@ -2,16 +2,9 @@
 // Licensed under the MIT License.
 using System;
 using System.ComponentModel;
-using System.Linq;
-using System.Net.Http;
-using System.Net.Mail;
 using System.Runtime.CompilerServices;
-using System.Security.Cryptography;
 using System.Text;
-using Microsoft.Macios.Generator.Attributes;
 using Microsoft.Macios.Generator.Availability;
-using Microsoft.Macios.Generator.DataModel;
-using ObjCRuntime;
 using Xamarin.Utils;
 
 namespace Microsoft.Macios.Generator;
@@ -29,7 +22,7 @@ namespace Microsoft.Macios.Generator;
 /// }
 /// </example>
 /// </summary>
-class TabbedStringBuilder : IDisposable {
+partial class TabbedStringBuilder : IDisposable {
 	readonly StringBuilder sb;
 	readonly uint tabCount;
 	readonly bool isBlock;
@@ -229,17 +222,6 @@ public TabbedStringBuilder AppendMemberAvailability (in SymbolAvailability allPl
 		return this;
 	}
 
-	public TabbedStringBuilder AppendExportData<T> (in ExportData<T> exportData) where T : Enum
-	{
-		// Try to write the smaller amount of data. We are using the old ExportAttribute until we make the final move
-		if (exportData.ArgumentSemantic != ArgumentSemantic.None) {
-			AppendLine ($"[Export (\"{exportData.Selector}\", ArgumentSemantic.{exportData.ArgumentSemantic})]");
-		} else {
-			AppendLine ($"[Export (\"{exportData.Selector}\")]");
-		}
-		return this;
-	}
-
 	public TabbedStringBuilder AppendNotificationAdvice (in string className, in string notification)
 	{
 		string attr =

src/rgen/Microsoft.Macios.Transformer/Microsoft.Macios.Transformer.csproj

@@ -33,6 +33,9 @@
         <Compile Include="../Microsoft.Macios.Generator/CollectionComparer.cs" >
             <Link>CollectionComparer.cs</Link>
         </Compile>
+        <Compile Include="../Microsoft.Macios.Generator/TabbedStringBuilder.cs" >
+            <Link>TabbedStringBuilder.cs</Link>
+        </Compile>
         <Compile Include="../Microsoft.Macios.Generator/Attributes/ObsoletedOSPlatformData.cs" >
             <Link>Attributes/ObsoletedOSPlatformData.cs</Link>
         </Compile>