Add ChangeToUpcast code fix

vsintegration/src/FSharp.Editor/CodeFix/ChangeToUpcast.fs

@@ -0,0 +1,55 @@
+// Copyright (c) Microsoft Corporation.  All Rights Reserved.  See License.txt in the project root for license information.
+
+namespace Microsoft.VisualStudio.FSharp.Editor
+
+open System.Composition
+open System.Threading.Tasks
+
+open Microsoft.CodeAnalysis.Text
+open Microsoft.CodeAnalysis.CodeFixes
+
+[<ExportCodeFixProvider(FSharpConstants.FSharpLanguageName, Name = "ChangeToUpcast"); Shared>]
+type internal FSharpChangeToUpcastCodeFixProvider() =
+    inherit CodeFixProvider()
+
+    let fixableDiagnosticIds = set ["FS3198"]
+
+    override __.FixableDiagnosticIds = Seq.toImmutableArray fixableDiagnosticIds
+
+    override this.RegisterCodeFixesAsync context : Task =
+        asyncMaybe {
+            let! sourceText = context.Document.GetTextAsync(context.CancellationToken)
+            let text = sourceText.GetSubText(context.Span).ToString()
+
+            // Only works if it's one or the other
+            let isDowncastOperator = text.Contains(":?>")
+            let isDowncastKeyword = text.Contains("downcast")
+            do! Option.guard ((isDowncastOperator || isDowncastKeyword) && not (isDowncastOperator && isDowncastKeyword))
+
+            let replacement =
+                if isDowncastOperator then
+                    text.Replace(":?>", ":>")
+                else
+                    text.Replace("downcast", "upcast")
+
+            let title =
+                if isDowncastOperator then
+                    SR.UseUpcastOperator()
+                else
+                    SR.UseUpcastKeyword()
+
+            let diagnostics =
+                context.Diagnostics
+                |> Seq.filter (fun x -> fixableDiagnosticIds |> Set.contains x.Id)
+                |> Seq.toImmutableArray
+
+            let codeFix =
+                CodeFixHelpers.createTextChangeCodeFix(
+                    title,
+                    context,
+                    (fun () -> asyncMaybe.Return [| TextChange(context.Span, replacement) |]))
+
+            context.RegisterCodeFix(codeFix, diagnostics)
+        }
+        |> Async.Ignore
+        |> RoslynHelpers.StartAsyncUnitAsTask(context.CancellationToken) 

vsintegration/src/FSharp.Editor/FSharp.Editor.fsproj

@@ -89,6 +89,7 @@
     <Compile Include="Commands\FsiCommandService.fs" />
     <Compile Include="Commands\XmlDocCommandService.fs" />
     <Compile Include="CodeFix\CodeFixHelpers.fs" />
+    <Compile Include="CodeFix\ChangeToUpcast.fs" />
     <Compile Include="CodeFix\AddMissingEqualsToTypeDefinition.fs" />
     <Compile Include="CodeFix\ConvertToSingleEqualsEqualityExpression.fs" />
     <Compile Include="CodeFix\ChangeRefCellDerefToNotExpression.fs" />

vsintegration/src/FSharp.Editor/FSharp.Editor.resx

@@ -219,6 +219,12 @@
   <data name="FSharpDisposableTopLevelValuesClassificationType" xml:space="preserve">
     <value>F# Dispostable Values (top-level)</value>
   </data>
+  <data name="UseUpcastKeyword" xml:space="preserve">
+    <value>Use 'upcast'</value>
+  </data>
+  <data name="UseUpcastOperator" xml:space="preserve">
+    <value>Use ':&gt;' operator</value>
+  </data>
   <data name="AddMissingEqualsToTypeDefinition" xml:space="preserve">
     <value>Add missing '=' to type definition</value>
   </data>

vsintegration/src/FSharp.Editor/xlf/FSharp.Editor.cs.xlf

@@ -187,6 +187,16 @@
         <target state="translated">Formátování</target>
         <note />
       </trans-unit>
+      <trans-unit id="UseUpcastKeyword">
+        <source>Use 'upcast'</source>
+        <target state="new">Use 'upcast'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UseUpcastOperator">
+        <source>Use ':&gt;' operator</source>
+        <target state="new">Use ':&gt;' operator</target>
+        <note />
+      </trans-unit>
       <trans-unit id="UseNotForNegation">
         <source>Use 'not' to negate expression</source>
         <target state="new">Use 'not' to negate expression</target>

vsintegration/src/FSharp.Editor/xlf/FSharp.Editor.de.xlf

@@ -187,6 +187,16 @@
         <target state="translated">Formatierung</target>
         <note />
       </trans-unit>
+      <trans-unit id="UseUpcastKeyword">
+        <source>Use 'upcast'</source>
+        <target state="new">Use 'upcast'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UseUpcastOperator">
+        <source>Use ':&gt;' operator</source>
+        <target state="new">Use ':&gt;' operator</target>
+        <note />
+      </trans-unit>
       <trans-unit id="UseNotForNegation">
         <source>Use 'not' to negate expression</source>
         <target state="new">Use 'not' to negate expression</target>

vsintegration/src/FSharp.Editor/xlf/FSharp.Editor.es.xlf

@@ -187,6 +187,16 @@
         <target state="translated">Formato</target>
         <note />
       </trans-unit>
+      <trans-unit id="UseUpcastKeyword">
+        <source>Use 'upcast'</source>
+        <target state="new">Use 'upcast'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UseUpcastOperator">
+        <source>Use ':&gt;' operator</source>
+        <target state="new">Use ':&gt;' operator</target>
+        <note />
+      </trans-unit>
       <trans-unit id="UseNotForNegation">
         <source>Use 'not' to negate expression</source>
         <target state="new">Use 'not' to negate expression</target>

vsintegration/src/FSharp.Editor/xlf/FSharp.Editor.fr.xlf

@@ -187,6 +187,16 @@
         <target state="translated">Mise en forme</target>
         <note />
       </trans-unit>
+      <trans-unit id="UseUpcastKeyword">
+        <source>Use 'upcast'</source>
+        <target state="new">Use 'upcast'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UseUpcastOperator">
+        <source>Use ':&gt;' operator</source>
+        <target state="new">Use ':&gt;' operator</target>
+        <note />
+      </trans-unit>
       <trans-unit id="UseNotForNegation">
         <source>Use 'not' to negate expression</source>
         <target state="new">Use 'not' to negate expression</target>

vsintegration/src/FSharp.Editor/xlf/FSharp.Editor.it.xlf

@@ -187,6 +187,16 @@
         <target state="translated">Formattazione</target>
         <note />
       </trans-unit>
+      <trans-unit id="UseUpcastKeyword">
+        <source>Use 'upcast'</source>
+        <target state="new">Use 'upcast'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UseUpcastOperator">
+        <source>Use ':&gt;' operator</source>
+        <target state="new">Use ':&gt;' operator</target>
+        <note />
+      </trans-unit>
       <trans-unit id="UseNotForNegation">
         <source>Use 'not' to negate expression</source>
         <target state="new">Use 'not' to negate expression</target>

vsintegration/src/FSharp.Editor/xlf/FSharp.Editor.ja.xlf

@@ -187,6 +187,16 @@
         <target state="translated">書式設定</target>
         <note />
       </trans-unit>
+      <trans-unit id="UseUpcastKeyword">
+        <source>Use 'upcast'</source>
+        <target state="new">Use 'upcast'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UseUpcastOperator">
+        <source>Use ':&gt;' operator</source>
+        <target state="new">Use ':&gt;' operator</target>
+        <note />
+      </trans-unit>
       <trans-unit id="UseNotForNegation">
         <source>Use 'not' to negate expression</source>
         <target state="new">Use 'not' to negate expression</target>

vsintegration/src/FSharp.Editor/xlf/FSharp.Editor.ko.xlf

@@ -187,6 +187,16 @@
         <target state="translated">서식</target>
         <note />
       </trans-unit>
+      <trans-unit id="UseUpcastKeyword">
+        <source>Use 'upcast'</source>
+        <target state="new">Use 'upcast'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UseUpcastOperator">
+        <source>Use ':&gt;' operator</source>
+        <target state="new">Use ':&gt;' operator</target>
+        <note />
+      </trans-unit>
       <trans-unit id="UseNotForNegation">
         <source>Use 'not' to negate expression</source>
         <target state="new">Use 'not' to negate expression</target>

vsintegration/src/FSharp.Editor/xlf/FSharp.Editor.pl.xlf

@@ -187,6 +187,16 @@
         <target state="translated">Formatowanie</target>
         <note />
       </trans-unit>
+      <trans-unit id="UseUpcastKeyword">
+        <source>Use 'upcast'</source>
+        <target state="new">Use 'upcast'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UseUpcastOperator">
+        <source>Use ':&gt;' operator</source>
+        <target state="new">Use ':&gt;' operator</target>
+        <note />
+      </trans-unit>
       <trans-unit id="UseNotForNegation">
         <source>Use 'not' to negate expression</source>
         <target state="new">Use 'not' to negate expression</target>

vsintegration/src/FSharp.Editor/xlf/FSharp.Editor.pt-BR.xlf

@@ -187,6 +187,16 @@
         <target state="translated">Formatação</target>
         <note />
       </trans-unit>
+      <trans-unit id="UseUpcastKeyword">
+        <source>Use 'upcast'</source>
+        <target state="new">Use 'upcast'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UseUpcastOperator">
+        <source>Use ':&gt;' operator</source>
+        <target state="new">Use ':&gt;' operator</target>
+        <note />
+      </trans-unit>
       <trans-unit id="UseNotForNegation">
         <source>Use 'not' to negate expression</source>
         <target state="new">Use 'not' to negate expression</target>

vsintegration/src/FSharp.Editor/xlf/FSharp.Editor.ru.xlf

@@ -187,6 +187,16 @@
         <target state="translated">Форматирование</target>
         <note />
       </trans-unit>
+      <trans-unit id="UseUpcastKeyword">
+        <source>Use 'upcast'</source>
+        <target state="new">Use 'upcast'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UseUpcastOperator">
+        <source>Use ':&gt;' operator</source>
+        <target state="new">Use ':&gt;' operator</target>
+        <note />
+      </trans-unit>
       <trans-unit id="UseNotForNegation">
         <source>Use 'not' to negate expression</source>
         <target state="new">Use 'not' to negate expression</target>

vsintegration/src/FSharp.Editor/xlf/FSharp.Editor.tr.xlf

@@ -187,6 +187,16 @@
         <target state="translated">Biçimlendirme</target>
         <note />
       </trans-unit>
+      <trans-unit id="UseUpcastKeyword">
+        <source>Use 'upcast'</source>
+        <target state="new">Use 'upcast'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UseUpcastOperator">
+        <source>Use ':&gt;' operator</source>
+        <target state="new">Use ':&gt;' operator</target>
+        <note />
+      </trans-unit>
       <trans-unit id="UseNotForNegation">
         <source>Use 'not' to negate expression</source>
         <target state="new">Use 'not' to negate expression</target>

vsintegration/src/FSharp.Editor/xlf/FSharp.Editor.zh-Hans.xlf

@@ -187,6 +187,16 @@
         <target state="translated">正在格式化</target>
         <note />
       </trans-unit>
+      <trans-unit id="UseUpcastKeyword">
+        <source>Use 'upcast'</source>
+        <target state="new">Use 'upcast'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UseUpcastOperator">
+        <source>Use ':&gt;' operator</source>
+        <target state="new">Use ':&gt;' operator</target>
+        <note />
+      </trans-unit>
       <trans-unit id="UseNotForNegation">
         <source>Use 'not' to negate expression</source>
         <target state="new">Use 'not' to negate expression</target>

vsintegration/src/FSharp.Editor/xlf/FSharp.Editor.zh-Hant.xlf

@@ -187,6 +187,16 @@
         <target state="translated">格式化</target>
         <note />
       </trans-unit>
+      <trans-unit id="UseUpcastKeyword">
+        <source>Use 'upcast'</source>
+        <target state="new">Use 'upcast'</target>
+        <note />
+      </trans-unit>
+      <trans-unit id="UseUpcastOperator">
+        <source>Use ':&gt;' operator</source>
+        <target state="new">Use ':&gt;' operator</target>
+        <note />
+      </trans-unit>
       <trans-unit id="UseNotForNegation">
         <source>Use 'not' to negate expression</source>
         <target state="new">Use 'not' to negate expression</target>