Add validation to image/figure directives

src/Elastic.Markdown/Myst/Directives/DirectiveBlock.cs

@@ -94,5 +94,8 @@ protected bool PropBool(params string[] keys)
 	protected void EmitError(ParserContext context, string message) =>
 		context.EmitError(Line + 1, 1, Directive.Length + 4 , message);
 
+	protected void EmitWarning(ParserContext context, string message) =>
+		context.EmitWarning(Line + 1, 1, Directive.Length + 4 , message);
+
 
 }

src/Elastic.Markdown/Myst/Directives/DirectiveHtmlRenderer.cs

@@ -79,13 +79,14 @@ protected override void Write(HtmlRenderer renderer, DirectiveBlock directiveBlo
 
 	private void WriteImage(HtmlRenderer renderer, ImageBlock block)
 	{
-		var imageUrl = block.ImageUrl.StartsWith("/_static") || block.ImageUrl.StartsWith("_static")
+		var imageUrl =
+			block.ImageUrl != null &&
+		               (block.ImageUrl.StartsWith("/_static") || block.ImageUrl.StartsWith("_static"))
 			? $"{block.Build.UrlPathPrefix}/{block.ImageUrl.TrimStart('/')}"
 			: block.ImageUrl;
 		var slice = Image.Create(new ImageViewModel
 		{
-			Classes = block.Classes,
-			CrossReferenceName = block.CrossReferenceName,
+			Label = block.Label,
 			Align = block.Align,
 			Alt = block.Alt,
 			Height = block.Height,
@@ -99,13 +100,12 @@ private void WriteImage(HtmlRenderer renderer, ImageBlock block)
 
 	private void WriteFigure(HtmlRenderer renderer, ImageBlock block)
 	{
-		var imageUrl = block.ImageUrl.StartsWith("/_static") || block.ImageUrl.StartsWith("_static")
+		var imageUrl = block.ImageUrl != null && (block.ImageUrl.StartsWith("/_static") || block.ImageUrl.StartsWith("_static"))
 			? $"{block.Build.UrlPathPrefix}/{block.ImageUrl.TrimStart('/')}"
 			: block.ImageUrl;
 		var slice = Slices.Directives.Figure.Create(new ImageViewModel
 		{
-			Classes = block.Classes,
-			CrossReferenceName = block.CrossReferenceName,
+			Label = block.Label,
 			Align = block.Align,
 			Alt = block.Alt,
 			Height = block.Height,

src/Elastic.Markdown/Myst/Directives/ImageBlock.cs

@@ -46,29 +46,59 @@ public class ImageBlock(DirectiveBlockParser parser, Dictionary<string, string>
 	/// </summary>
 	public string? Target { get; set; }
 
-	/// <summary>
-	/// A space-separated list of CSS classes to add to the image.
-	/// </summary>
-	public string? Classes { get; protected set; }
-
 	/// <summary>
 	/// A reference target for the admonition (see cross-referencing).
 	/// </summary>
-	public string? CrossReferenceName  { get; private set; }
+	public string? Label  { get; private set; }
+
+	public string? ImageUrl { get; private set; }
+
+	public bool Found { get; private set; }
 
-	public string ImageUrl { get; private set; } = default!;
 
 	public override void FinalizeAndValidate(ParserContext context)
 	{
-		ImageUrl = Arguments ?? string.Empty; //todo validate
-		Classes = Properties.GetValueOrDefault("class");
-		CrossReferenceName = Properties.GetValueOrDefault("name");
-		Alt = Properties.GetValueOrDefault("alt");
-		Height = Properties.GetValueOrDefault("height");
-		Width = Properties.GetValueOrDefault("width");
-		Scale = Properties.GetValueOrDefault("scale");
-		Align = Properties.GetValueOrDefault("align");
-		Target = Properties.GetValueOrDefault("target");
+		Label = Prop("label", "name");
+		Alt = Prop("alt");
+		Align = Prop("align");
+
+		Height = Prop("height", "h");
+		Width = Prop("width", "w");
+
+		Scale = Prop("scale");
+		Target = Prop("target");
+
+		ExtractImageUrl(context);
+
+	}
+
+	private void ExtractImageUrl(ParserContext context)
+	{
+		var imageUrl = Arguments;
+		if (string.IsNullOrWhiteSpace(imageUrl))
+		{
+			EmitError(context , $"{Directive} requires an argument.");
+			return;
+		}
+
+		if (Uri.TryCreate(imageUrl, UriKind.Absolute, out var uri) && uri.Scheme.StartsWith("http"))
+		{
+			EmitWarning(context, $"{Directive} is using an external URI: {uri} ");
+			Found = true;
+			ImageUrl = imageUrl;
+			return;
+		}
+
+		var includeFrom = context.Path.Directory!.FullName;
+		if (imageUrl.StartsWith('/'))
+			includeFrom = context.Parser.SourcePath.FullName;
+
+		ImageUrl = imageUrl;
+		var imagePath = Path.Combine(includeFrom, imageUrl.TrimStart('/'));
+		if (context.Build.ReadFileSystem.File.Exists(imageUrl))
+			Found = true;
+		else
+			EmitError(context, $"`{imageUrl}` does not exist. resolved to `{imagePath}");
 	}
 }
 

src/Elastic.Markdown/Myst/Directives/IncludeBlock.cs

@@ -33,13 +33,17 @@ public class IncludeBlock(DirectiveBlockParser parser, Dictionary<string, string
 	//https://mystmd.org/guide/directives#directive-include
 	public override void FinalizeAndValidate(ParserContext context)
 	{
-		var includePath = Arguments; //todo validate
-
 		Literal |= PropBool("literal");
 		Language = Prop("lang", "language", "code");
 		Caption = Prop("caption");
 		Label = Prop("label");
 
+		ExtractInclusionPath(context);
+	}
+
+	private void ExtractInclusionPath(ParserContext context)
+	{
+		var includePath = Arguments;
 		if (string.IsNullOrWhiteSpace(includePath))
 		{
 			context.EmitError(Line, Column, $"```{{{Directive}}}".Length , "include requires an argument.");
@@ -55,8 +59,6 @@ public override void FinalizeAndValidate(ParserContext context)
 			Found = true;
 		else
 			EmitError(context, $"`{IncludePath}` does not exist.");
-
-
 	}
 }
 

src/Elastic.Markdown/Slices/Directives/Figure.cshtml

@@ -1,8 +1,8 @@
 @inherits RazorSlice<ImageViewModel>
-<figure class="align-default" id="@Model.CrossReferenceName">
+<figure class="align-default" id="@Model.Label">
 	<a class="reference internal image-reference" href="@Model.ImageUrl"><img alt="@Model.Alt" class="align-center" src="@Model.ImageUrl" style="@Model.Style">
 	</a>
 	<figcaption>
-		<p>[CONTENT]<a class="headerlink" href="@Model.CrossReferenceName" title="Link to this image">¶</a></p>
+		<p>[CONTENT]<a class="headerlink" href="@Model.Label" title="Link to this image">¶</a></p>
 	</figcaption>
 </figure>

src/Elastic.Markdown/Slices/Directives/_ViewModels.cs

@@ -2,7 +2,6 @@
 // Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
 // See the LICENSE file in the project root for more information
 using System.Text;
-using Elastic.Markdown.Myst.Directives;
 
 namespace Elastic.Markdown.Slices.Directives;
 
@@ -45,8 +44,7 @@ public class IncludeViewModel
 
 public class ImageViewModel
 {
-	public required string? CrossReferenceName { get; init; }
-	public required string? Classes { get; init; }
+	public required string? Label { get; init; }
 	public required string? Align { get; init; }
 	public required string? Alt { get; init; }
 	public required string? Height { get; init; }

tests/Elastic.Markdown.Tests/Directives/DirectiveBaseTests.cs

@@ -64,7 +64,7 @@ protected DirectiveTest(ITestOutputHelper output, [LanguageInjection("markdown")
 		});
 
 		var file = FileSystem.FileInfo.New("docs/source/index.md");
-		var root = FileSystem.DirectoryInfo.New(Paths.Root.FullName);
+		var root = file.Directory!;
 		Collector = new TestDiagnosticsCollector(logger);
 		var context = new BuildContext
 		{

tests/Elastic.Markdown.Tests/Directives/ImageTests.cs

@@ -1,22 +1,29 @@
 // Licensed to Elasticsearch B.V under one or more agreements.
 // Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
 // See the LICENSE file in the project root for more information
+
+using Elastic.Markdown.Diagnostics;
 using Elastic.Markdown.Myst.Directives;
 using FluentAssertions;
-using Xunit;
 using Xunit.Abstractions;
 
 namespace Elastic.Markdown.Tests.Directives;
 
 public class ImageBlockTests(ITestOutputHelper output) : DirectiveTest<ImageBlock>(output,
 """
-```{image} /_static/img/observability.png
+```{image} img/observability.png
 :alt: Elasticsearch
 :width: 250px
 ```
 """
 )
 {
+	public override Task InitializeAsync()
+	{
+		FileSystem.AddFile(@"img/observability.png", "");
+		return base.InitializeAsync();
+	}
+
 	[Fact]
 	public void ParsesBlock() => Block.Should().NotBeNull();
 
@@ -25,7 +32,14 @@ public void ParsesBreakPoint()
 	{
 		Block!.Alt.Should().Be("Elasticsearch");
 		Block!.Width.Should().Be("250px");
-		Block!.ImageUrl.Should().Be("/_static/img/observability.png");
+		Block!.ImageUrl.Should().Be("img/observability.png");
+	}
+
+	[Fact]
+	public void ImageIsFoundSoNoErrorIsEmitted()
+	{
+		Block!.Found.Should().BeTrue();
+		Collector.Diagnostics.Count.Should().Be(0);
 	}
 }
 
@@ -45,7 +59,11 @@ Relaxing at the beach 🏝 🌊 😎
 	public void ParsesBlock() => Block.Should().NotBeNull();
 
 	[Fact]
-	public void ParsesBreakPoint()
+	public void WarnsOnExternalUri()
 	{
+		Block!.Found.Should().BeTrue();
+
+		Collector.Diagnostics.Should().HaveCount(1)
+			.And.OnlyContain(d => d.Severity == Severity.Warning);
 	}
 }