Make sure we escape constants XML comments

This ensures we get valid XML doc comments, rather than potentially nested (invalid) XML if the property happens to contain XML.

Author: kzu

src/ThisAssembly.Constants/CSharp.sbntxt

@@ -13,7 +13,7 @@
         {{~ if $0.Comment ~}}
         {{ $0.Comment }}
         {{~ else ~}}
-	    /// => @"{{ $0.Value }}"
+	    /// => @"{{ $0.EscapedValue }}"
         {{~ end ~}}
 	    /// </summary>
 {{- end -}}

src/ThisAssembly.Constants/ConstantsGenerator.cs

@@ -3,6 +3,7 @@
 using System.IO;
 using System.Linq;
 using System.Text;
+using System.Xml.Linq;
 using Devlooped.Sponsors;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
@@ -93,9 +94,9 @@ void GenerateConstant(SourceProductionContext spc,
         }
 
         if (comment != null)
-            comment = "/// " + string.Join(Environment.NewLine + "/// ", comment.Trim().Replace("\\n", Environment.NewLine).Trim(['\r', '\n']).Split([Environment.NewLine], StringSplitOptions.None));
+            comment = "/// " + string.Join(Environment.NewLine + "/// ", new XText(comment).ToString().Trim().Replace("\\n", Environment.NewLine).Trim(['\r', '\n']).Split([Environment.NewLine], StringSplitOptions.None));
         else
-            comment = "/// " + string.Join(Environment.NewLine + "/// ", value.Replace("\\n", Environment.NewLine).Trim(['\r', '\n']).Split([Environment.NewLine], StringSplitOptions.None));
+            comment = "/// " + string.Join(Environment.NewLine + "/// ", new XText(value).ToString().Replace("\\n", Environment.NewLine).Trim(['\r', '\n']).Split([Environment.NewLine], StringSplitOptions.None));
 
         // Revert normalization of newlines performed in MSBuild to workaround the limitation in editorconfig.
         var rootArea = Area.Load([new(name, value.Replace("\\n", Environment.NewLine).Trim(['\r', '\n']), comment, type ?? "string"),], root, rootComment);

src/ThisAssembly.Constants/Model.cs

@@ -4,6 +4,7 @@
 using System.Linq;
 using System.Reflection;
 using System.Text.RegularExpressions;
+using System.Xml.Linq;
 using Microsoft.CodeAnalysis.CSharp;
 
 namespace ThisAssembly;
@@ -110,5 +111,6 @@ static Area GetArea(Area area, IEnumerable<string> areaPath)
 [DebuggerDisplay("{Name} = {Value}")]
 record Constant(string Name, string? Value, string? Comment, string Type = "string")
 {
+    public string? EscapedValue => Value == null ? null : new XText(Value).ToString();
     public bool IsText => Type.Equals("string", StringComparison.OrdinalIgnoreCase);
 }

src/ThisAssembly.Tests/ThisAssembly.Tests.csproj

@@ -19,10 +19,11 @@
       // Some comments too.</Description>
     <TargetFramework Condition="'$(BuildingInsideVisualStudio)' == 'true'">net472</TargetFramework>
     <RootNamespace>ThisAssemblyTests</RootNamespace>
-    <!--<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>-->
+    <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
     <NoWarn>CS0618;CS8981;TA100;$(NoWarn)</NoWarn>
     <PackageScribanIncludeSource>false</PackageScribanIncludeSource>
     <ProjectFile>$([System.IO.File]::ReadAllText($(MSBuildProjectFullPath)))</ProjectFile>
+    <ProjectFileComment>$(ProjectFile)</ProjectFileComment>
   </PropertyGroup>
 
   <Import Project="..\*\ThisAssembly*.props" />
@@ -69,7 +70,8 @@
     <ProjectProperty Include="Foo" />
     <ProjectProperty Include="Description" />
     <ProjectProperty Include="Multiline" />
-    <ProjectProperty Include="ProjectFile" Comment="Full project contents" />
+    <ProjectProperty Include="ProjectFileComment" Comment="Full project contents" />
+    <ProjectProperty Include="ProjectFile" />
     <Constant Include="Foo.Raw" Value="$(Multiline)" Comment="$(Multiline)" />
     <Constant Include="Foo.Bar" Value="Baz" Comment="Yay!" />
     <Constant Include="Foo.Hello" Value="World" Comment="Comments make everything better 😍" />