Enable better cross-tree tracking of unmatched nodes and attributes

Author: egil

src/Core/AttributeComparisonSource.cs

@@ -1,6 +1,6 @@
 using System;
-using AngleSharp.Dom;
 using System.Diagnostics.CodeAnalysis;
+using AngleSharp.Dom;
 
 namespace Egil.AngleSharp.Diffing.Core
 {

src/Core/Comparison.cs

@@ -1,5 +1,4 @@
 using System;
-using AngleSharp.Dom;
 
 namespace Egil.AngleSharp.Diffing.Core
 {

src/Core/ComparisonSource.cs

@@ -1,7 +1,7 @@
 using System;
-using AngleSharp.Dom;
-using System.Diagnostics.CodeAnalysis;
 using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
+using AngleSharp.Dom;
 
 namespace Egil.AngleSharp.Diffing.Core
 {

src/Core/DiffContext.cs

@@ -13,12 +13,18 @@ public class DiffContext
 
         internal HashSet<ComparisonSource> UnexpectedSources { get; }
 
+        internal HashSet<AttributeComparisonSource> MissingAttributeSources { get; }
+
+        internal HashSet<AttributeComparisonSource> UnexpectedAttributeSources { get; }
+
         public DiffContext(IElement? controlRoot, IElement? testRoot)
         {
             _controlRoot = controlRoot;
             _testRoot = testRoot;
             MissingSources = new HashSet<ComparisonSource>();
             UnexpectedSources = new HashSet<ComparisonSource>();
+            MissingAttributeSources = new HashSet<AttributeComparisonSource>();
+            UnexpectedAttributeSources = new HashSet<AttributeComparisonSource>();
         }
 
         public IHtmlCollection<IElement> QueryControlRoot(string selector)
@@ -32,5 +38,13 @@ public IHtmlCollection<IElement> QueryTestRoot(string selector)
             if (_testRoot is null) return EmptyHtmlCollection<IElement>.Empty;
             return _testRoot.QuerySelectorAll(selector);
         }
+
+        internal IEnumerable<IDiff> GetDiffsFromUnmatched()
+        {
+            foreach (var source in MissingSources) yield return new MissingNodeDiff(source);
+            foreach (var source in UnexpectedSources) yield return new UnexpectedNodeDiff(source);
+            foreach (var source in MissingAttributeSources) yield return new MissingAttrDiff(source);
+            foreach (var source in UnexpectedAttributeSources) yield return new UnexpectedAttrDiff(source);
+        }
     }
 }

src/Core/Diffs/AttrDiff.cs

@@ -1,7 +1,4 @@
-using System;
-using System.Diagnostics;
-
-namespace Egil.AngleSharp.Diffing.Core
+namespace Egil.AngleSharp.Diffing.Core
 {
     public class AttrDiff : DiffBase<AttributeComparisonSource>
     {

src/Core/Diffs/Diff.cs

@@ -1,7 +1,7 @@
 namespace Egil.AngleSharp.Diffing.Core
 {
     public class Diff : DiffBase<ComparisonSource>
-    {        
+    {
         public Diff(in Comparison comparison) : base(comparison.Control, comparison.Test, comparison.Control.Node.NodeType.ToDiffTarget())
         {
         }

src/Core/Diffs/MissingAttrDiff.cs

@@ -4,7 +4,7 @@ namespace Egil.AngleSharp.Diffing.Core
 {
     [DebuggerDisplay("Diff={Target} {Result}]")]
     public class MissingAttrDiff : MissingDiffBase<AttributeComparisonSource>
-    {       
+    {
         internal MissingAttrDiff(in AttributeComparisonSource control) : base(control, DiffTarget.Attribute)
         {
         }

src/Core/Diffs/MissingNodeDiff.cs

@@ -1,6 +1,4 @@
-using System;
-using System.Diagnostics;
-using AngleSharp.Dom;
+using System.Diagnostics;
 
 namespace Egil.AngleSharp.Diffing.Core
 {

src/Core/Diffs/UnexpectedAttrDiff.cs

@@ -1,5 +1,4 @@
-using System;
-using System.Diagnostics;
+using System.Diagnostics;
 
 namespace Egil.AngleSharp.Diffing.Core
 {

src/Core/Diffs/UnexpectedNodeDiff.cs

@@ -1,6 +1,4 @@
-using System;
-using System.Diagnostics;
-using AngleSharp.Dom;
+using System.Diagnostics;
 
 namespace Egil.AngleSharp.Diffing.Core
 {