Emit error when parsing fails

Author: reakaleek

src/Elastic.Markdown/Myst/Roles/Kbd/Kbd.cs

@@ -14,6 +14,8 @@ public class KeyboardShortcut(IReadOnlyList<IKeyNode> keys)
 {
 	private IReadOnlyList<IKeyNode> Keys { get; } = keys;
 
+	public static KeyboardShortcut Empty { get; } = new([]);
+
 	public static KeyboardShortcut Parse(string input)
 	{
 		if (string.IsNullOrWhiteSpace(input))

src/Elastic.Markdown/Myst/Roles/Kbd/KbdParser.cs

@@ -3,15 +3,16 @@
 // See the LICENSE file in the project root for more information
 
 using System;
+using Elastic.Markdown.Diagnostics;
 using Markdig.Parsers;
 
 namespace Elastic.Markdown.Myst.Roles.Kbd;
 
 public class KbdParser : RoleParser<KbdRole>
 {
 
-	protected override KbdRole CreateRole(string role, string content, InlineProcessor parserContext) =>
-		new(role, content);
+	protected override KbdRole CreateRole(string role, string content, InlineProcessor parserContext)
+		=> new(role, content, parserContext);
 
 	protected override bool Matches(ReadOnlySpan<char> role) => role is "{kbd}";
 }

src/Elastic.Markdown/Myst/Roles/Kbd/KbdRole.cs

@@ -3,11 +3,25 @@
 // See the LICENSE file in the project root for more information
 
 using System.Diagnostics;
+using Elastic.Markdown.Diagnostics;
+using Markdig.Parsers;
 
 namespace Elastic.Markdown.Myst.Roles.Kbd;
 
 [DebuggerDisplay("{GetType().Name} Line: {Line}, Role: {Role}, Content: {Content}")]
-public class KbdRole(string role, string content) : RoleLeaf(role, content)
+public class KbdRole : RoleLeaf
 {
-	public KeyboardShortcut KeyboardShortcut { get; } = KeyboardShortcut.Parse(content);
+	public KbdRole(string role, string content, InlineProcessor parserContext) : base(role, content)
+	{
+		try
+		{
+			KeyboardShortcut = KeyboardShortcut.Parse(content);
+		}
+		catch (Exception ex)
+		{
+			parserContext.EmitError(this, Role.Length + content.Length, $"Failed to parse keyboard shortcut: \"{content}\"", ex);
+			KeyboardShortcut = KeyboardShortcut.Empty;
+		}
+	}
+	public KeyboardShortcut KeyboardShortcut { get; }
 }