Improve rendering in non-async context

Directory.Build.props

@@ -12,6 +12,6 @@
     <RepositoryUrl>https://github.com/SebastianStehle/mjml-net.git</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
-    <Version>4.0.0</Version>
+    <Version>4.1.0</Version>
   </PropertyGroup>
 </Project>

Mjml.Net.PostProcessors/Components/AttributeSelectorComponent.cs

@@ -18,7 +18,7 @@ public partial class SelectorComponent : Component
 
     public override void Render(IHtmlRenderer renderer, GlobalContext context)
     {
-        if (!context.Options.HasProcessor<AttributesPostProcessor>())
+        if (!context.Async || !context.Options.HasProcessor<AttributesPostProcessor>())
         {
             return;
         }

Mjml.Net.PostProcessors/Components/HtmlAttributeComponent.cs

@@ -21,7 +21,7 @@ public partial class HtmlAttributeComponent : Component
 
     public override void Render(IHtmlRenderer renderer, GlobalContext context)
     {
-        if (!context.Options.HasProcessor<AttributesPostProcessor>())
+        if (!context.Async || !context.Options.HasProcessor<AttributesPostProcessor>())
         {
             return;
         }

Mjml.Net.PostProcessors/Components/HtmlAttributesComponent.cs

@@ -15,7 +15,7 @@ public partial class HtmlAttributesComponent : Component
 
     public override void Render(IHtmlRenderer renderer, GlobalContext context)
     {
-        if (!context.Options.HasProcessor<AttributesPostProcessor>())
+        if (!context.Async || !context.Options.HasProcessor<AttributesPostProcessor>())
         {
             return;
         }

Mjml.Net/GlobalContext.cs

@@ -14,18 +14,15 @@ public sealed class GlobalContext
 
     public Dictionary<string, Dictionary<string, string>> AttributesByName => attributesByName;
 
-    public MjmlOptions Options { get; private set; }
+    public MjmlOptions Options { get; set; }
+
+    public bool Async { get; set; }
 
     public IFileLoader? FileLoader
     {
         get => fileLoader ??= Options?.FileLoader?.Invoke();
     }
 
-    public void SetOptions(MjmlOptions options)
-    {
-        Options = options;
-    }
-
     public void Clear()
     {
         GlobalData.Clear();

Mjml.Net/MjmlRenderContext.cs

@@ -19,13 +19,14 @@ public ValidationErrors Validate()
         return new ValidationErrors(errors);
     }
 
-    public void Setup(MjmlRenderer mjmlRenderer, MjmlOptions? mjmlOptions)
+    public void Setup(MjmlRenderer mjmlRenderer, bool isAsync, MjmlOptions? mjmlOptions)
     {
         this.mjmlRenderer = mjmlRenderer;
         this.mjmlOptions = mjmlOptions ??= new MjmlOptions();
 
         // Reuse the context and therefore do not set them over the constructor.
-        context.SetOptions(mjmlOptions);
+        context.Options = mjmlOptions;
+        context.Async = isAsync;
 
         validationContext.Options = mjmlOptions;
     }

Mjml.Net/MjmlRenderer.cs

@@ -106,7 +106,7 @@ public IMjmlRenderer ClearHelpers()
     /// <inheritdoc />
     public RenderResult Render(string mjml, MjmlOptions? options = null)
     {
-        return RenderCore(mjml, options).Result;
+        return RenderCore(mjml, false, options).Result;
     }
 
     /// <inheritdoc />
@@ -118,7 +118,7 @@ public RenderResult Render(Stream mjml, MjmlOptions? options = null)
     /// <inheritdoc />
     public RenderResult Render(TextReader mjml, MjmlOptions? options = null)
     {
-        return RenderCore(mjml.ReadToEnd(), options).Result;
+        return RenderCore(mjml.ReadToEnd(), false, options).Result;
     }
 
     public async ValueTask<RenderResult> RenderAsync(string mjml, MjmlOptions? options = null,
@@ -147,7 +147,7 @@ private async ValueTask<RenderResult> RenderCoreAsync(string mjml, MjmlOptions?
         CancellationToken ct)
     {
 #pragma warning disable MA0042 // Do not use blocking calls in an async method
-        var (result, actualOptions) = RenderCore(mjml, options);
+        var (result, actualOptions) = RenderCore(mjml, true, options);
 #pragma warning restore MA0042 // Do not use blocking calls in an async method
 
         if (actualOptions?.PostProcessors?.Length > 0 && !string.IsNullOrWhiteSpace(result.Html))
@@ -165,7 +165,7 @@ private async ValueTask<RenderResult> RenderCoreAsync(string mjml, MjmlOptions?
         return result;
     }
 
-    private (RenderResult Result, MjmlOptions Options) RenderCore(string mjml, MjmlOptions? options)
+    private (RenderResult Result, MjmlOptions Options) RenderCore(string mjml, bool isAsync, MjmlOptions? options)
     {
         options ??= new MjmlOptions();
 
@@ -174,7 +174,7 @@ private async ValueTask<RenderResult> RenderCoreAsync(string mjml, MjmlOptions?
         var context = DefaultPools.RenderContexts.Get();
         try
         {
-            context.Setup(this, options);
+            context.Setup(this, isAsync, options);
             context.StartBuffer();
             context.Read(reader, null, null);
 

Tests/Components/HtmlAttributesTests.cs

@@ -34,6 +34,35 @@ public async Task Should_render_attributes()
 
         AssertHelpers.HtmlFileAssert("Components.Outputs.HtmlAttributes.html", result);
     }
+    [Fact]
+    public void Should_not_render_attributes_in_sync_context()
+    {
+        var source = @"
+<mjml-test>
+  <mj-head>
+    <mj-html-attributes>
+      <mj-selector path="".custom div"">
+        <mj-html-attribute name=""data-id"">42</mj-html-attribute>
+      </mj-selector>
+    </mj-html-attributes>
+  </mj-head>
+  <mj-body>
+    <mj-raw>
+      <div class=""custom"">
+        <div></div>
+      </div>
+    </mj-raw>
+  </mj-body>
+</mjml-test>
+";
+
+        var (result, _) = TestHelper.Render(source, new MjmlOptions
+        {
+            PostProcessors = [AngleSharpPostProcessor.Default]
+        }, helpers: []);
+
+        AssertHelpers.HtmlFileAssert("Components.Outputs.HtmlAttributeInvalid.html", result);
+    }
 
     [Fact]
     public async Task Should_render_selector_only()

Tests/HtmlExtensionsTests.cs

@@ -15,7 +15,7 @@ public HtmlExtensionsTests()
             Beautify = true
         };
 
-        sut.Setup(new MjmlRenderer(), options);
+        sut.Setup(new MjmlRenderer(), false, options);
         sut.StartBuffer();
     }
 

Tests/HtmlRenderTests.cs

@@ -16,7 +16,7 @@ public HtmlRenderTests()
             Beautify = true
         };
 
-        sut.Setup(new MjmlRenderer(), options);
+        sut.Setup(new MjmlRenderer(), false, options);
         sut.StartBuffer();
     }