Make selectors accessors public

This commit modifies the access level of internal accessors on the
selector instance, making them public. This change allows for better
integration and utilization of the selector in LINQ queries when the
package is used within other applications.

Author: Gideon de Swardt

src/ExCSS.Tests/ExCSS.Tests.csproj

@@ -30,4 +30,8 @@
     <Folder Include="Properties\" />
   </ItemGroup>
 
+  <ItemGroup>
+    <EmbeddedResource Include="bootstrap.css" />
+  </ItemGroup>
+
 </Project>

src/ExCSS.Tests/Selectors.cs

@@ -0,0 +1,67 @@
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace ExCSS.Tests;
+
+public class SelectorsTests
+{
+    [Fact]
+    public async Task FindAllStyleRulesForAnElement()
+    {
+        // Arrange
+        var sheet = await ParseBootstrapAsync();
+
+        // Act
+        var list = sheet.StyleRules
+            .Where(r =>
+                r.Selector is SimpleSelector { Text: "input" }
+                || (r.Selector is CompoundSelector selector && selector.First() is SimpleSelector { Text: "input" })
+            );
+
+        // Assert
+        Assert.Equal(6, list.Count());
+    }
+
+    [Fact]
+    public async Task FindAllStyleRulesElementsWithMoreThanTwoCompoundSelectors()
+    {
+        // Arrange
+        var sheet = await ParseBootstrapAsync();
+
+        // Act
+        var list = sheet.StyleRules
+            .Where(r => (r.Selector as CompoundSelector)?.Length > 2);
+
+        // Assert
+        Assert.Equal(2, list.Count());
+    }
+
+    [Fact]
+    public async Task FindAllStyleRulesWithCompoundSelector()
+    {
+        // Arrange
+        var sheet = await ParseBootstrapAsync();
+
+        // Act
+        var list = sheet.StyleRules
+            .Where(r => r.Selector is CompoundSelector selector && selector.Last().Text.StartsWith("["));
+
+        // Assert
+        Assert.Equal(7, list.Count());
+    }
+
+    private async Task<Stylesheet> ParseBootstrapAsync()
+    {
+        await using var stream = GetStream("bootstrap.css");
+        var parser = new StylesheetParser();
+        return await parser.ParseAsync(stream);
+    }
+
+    private Stream GetStream(string fileName)
+    {
+        var fullyQualifiedName = $"{GetType().Namespace}.{fileName}";
+        return GetType().Assembly.GetManifestResourceStream(fullyQualifiedName);
+    }
+}

src/ExCSS/Model/Combinator.cs

@@ -1,6 +1,6 @@
 namespace ExCSS
 {
-    internal abstract class Combinator
+    public abstract class Combinator
     {
         public static readonly Combinator Child = new ChildCombinator();
         public static readonly Combinator Deep = new DeepCombinator();

src/ExCSS/Selectors/ChildSelector.cs

@@ -2,7 +2,7 @@
 
 namespace ExCSS
 {
-    internal abstract class ChildSelector : StylesheetNode, ISelector
+    public abstract class ChildSelector : StylesheetNode, ISelector
     {
         private readonly string _name;
         protected int Step;

src/ExCSS/Selectors/ComplexSelector.cs

@@ -3,7 +3,7 @@
 
 namespace ExCSS
 {
-    internal sealed class ComplexSelector : StylesheetNode, ISelector
+    public sealed class ComplexSelector : StylesheetNode, ISelector
     {
         private readonly List<CombinatorSelector> _selectors;
 
@@ -18,7 +18,6 @@ private struct CombinatorSelector
             public ISelector Selector;
         }
 
-
         public string Text => this.ToCss();
         public int Length => _selectors.Count;
         public bool IsReady { get; private set; }

src/ExCSS/Selectors/CompoundSelector.cs

@@ -2,7 +2,7 @@
 
 namespace ExCSS
 {
-    internal sealed class CompoundSelector : Selectors, ISelector
+    public sealed class CompoundSelector : Selectors, ISelector
     {
         public override void ToCss(TextWriter writer, IStyleFormatter formatter)
         {

src/ExCSS/Selectors/FirstChildSelector.cs

@@ -1,7 +1,7 @@
 namespace ExCSS
 
 {
-    internal sealed class FirstChildSelector : ChildSelector
+    public sealed class FirstChildSelector : ChildSelector
     {
         public FirstChildSelector()
             : base(PseudoClassNames.NthChild)

src/ExCSS/Selectors/FirstColumnSelector.cs

@@ -1,6 +1,6 @@
 namespace ExCSS
 {
-    internal sealed class FirstColumnSelector : ChildSelector
+    public sealed class FirstColumnSelector : ChildSelector
     {
         public FirstColumnSelector()
             : base(PseudoClassNames.NthColumn)

src/ExCSS/Selectors/FirstTypeSelector.cs

@@ -1,6 +1,6 @@
 namespace ExCSS
 {
-    internal sealed class FirstTypeSelector : ChildSelector
+    public sealed class FirstTypeSelector : ChildSelector
     {
         public FirstTypeSelector()
             : base(PseudoClassNames.NthOfType)

src/ExCSS/Selectors/LastChildSelector.cs

@@ -1,6 +1,6 @@
 namespace ExCSS
 {
-    internal sealed class LastChildSelector : ChildSelector
+    public sealed class LastChildSelector : ChildSelector
     {
         public LastChildSelector()
             : base(PseudoClassNames.NthLastChild)