document syntax highlighting

src/SharpIDE.Application/Features/Analysis/RoslynAnalysis.cs

@@ -2,6 +2,7 @@
 using System.Diagnostics;
 using Ardalis.GuardClauses;
 using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Classification;
 using Microsoft.CodeAnalysis.CodeActions;
 using Microsoft.CodeAnalysis.CodeFixes;
 using Microsoft.CodeAnalysis.CodeRefactorings;
@@ -143,6 +144,23 @@ public static class RoslynAnalysis
 		return diagnostics;
 	}
 
+	public static async Task<IEnumerable<(FileLinePositionSpan fileSpan, ClassifiedSpan classifiedSpan)>> GetDocumentSyntaxHighlighting(SharpIdeFile fileModel)
+	{
+		await _solutionLoadedTcs.Task;
+		var cancellationToken = CancellationToken.None;
+		var project = _workspace!.CurrentSolution.Projects.Single(s => s.FilePath == ((IChildSharpIdeNode)fileModel).GetNearestProjectNode()!.FilePath);
+		var document = project.Documents.Single(s => s.FilePath == fileModel.Path);
+		Guard.Against.Null(document, nameof(document));
+
+		var syntaxTree = await document.GetSyntaxTreeAsync(cancellationToken);
+		var root = await syntaxTree!.GetRootAsync(cancellationToken);
+		var classifiedSpans = await Classifier.GetClassifiedSpansAsync(document, root.FullSpan, cancellationToken);
+
+		var result = classifiedSpans.Select(s => (syntaxTree.GetMappedLineSpan(s.TextSpan), s));
+
+		return result;
+	}
+
 	public static async Task<ImmutableArray<CodeAction>> GetCodeFixesAsync(Diagnostic diagnostic)
 	{
 		var cancellationToken = CancellationToken.None;

src/SharpIDE.Godot/CustomSyntaxHighlighter.cs

@@ -1,30 +1,87 @@
-using System.Linq;
+using System.Collections.Generic;
 using Godot;
 using Godot.Collections;
-using System.Text.RegularExpressions;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Classification;
 
 namespace SharpIDE.Godot;
 
 public partial class CustomHighlighter : SyntaxHighlighter
 {
+    public IEnumerable<(FileLinePositionSpan fileSpan, ClassifiedSpan classifiedSpan)> ClassifiedSpans = [];
     public override Dictionary _GetLineSyntaxHighlighting(int line)
+    {
+        var highlights = MapClassifiedSpansToHighlights(line);
+
+        return highlights;
+    }
+    
+    private static readonly StringName ColorStringName = "color";
+    private Dictionary MapClassifiedSpansToHighlights(int line)
     {
         var highlights = new Dictionary();
-        var text = GetTextEdit().GetLine(line);
 
-        var regex = new Regex(@"\bTODO\b");
-        var matches = regex.Matches(text);
-
-        foreach (Match match in matches)
+        foreach (var (fileSpan, classifiedSpan) in ClassifiedSpans)
         {
-            highlights[match.Index] = new Dictionary
+            // Only take spans on the requested line
+            if (fileSpan.StartLinePosition.Line != line)
+                continue;
+
+            if (classifiedSpan.TextSpan.Length == 0)
+                continue; // Skip empty spans
+
+            // Column index of the first character in this span
+            int columnIndex = fileSpan.StartLinePosition.Character;
+
+            // Build the highlight entry
+            var highlightInfo = new Dictionary
             {
-                { "color", new Color(1, 0, 0) }, // red
-                { "underline", true }, // not implemented
-                { "length", match.Length } // not implemented
+                { ColorStringName, GetColorForClassification(classifiedSpan.ClassificationType) }
             };
+
+            highlights[columnIndex] = highlightInfo;
         }
 
         return highlights;
     }
+    
+    private Color GetColorForClassification(string classificationType)
+    {
+        return classificationType switch
+        {
+            // Keywords
+            "keyword" => new Color("569cd6"),
+            "keyword - control" => new Color("569cd6"),
+            "preprocessor keyword" => new Color("569cd6"),
+
+            // Literals & comments
+            "string" => new Color("d69d85"),
+            "comment" => new Color("57a64a"),
+            "number" => new Color("b5cea8"),
+
+            // Types (User Types)
+            "class name" => new Color("4ec9b0"),
+            "struct name" => new Color("4ec9b0"),
+            "interface name" => new Color("b8d7a3"),
+            "namespace name" => new Color("dcdcdc"),
+            
+            // Identifiers & members
+            "identifier" => new Color("dcdcdc"),
+            "method name" => new Color("dcdcaa"),
+            "extension method name" => new Color("dcdcaa"),
+            "property name" => new Color("dcdcdc"),
+            "static symbol" => new Color("dcdcdc"),
+            "parameter name" => new Color("9cdcfe"),
+            "local name" => new Color("9cdcfe"),
+
+            // Punctuation & operators
+            "operator" => new Color("dcdcdc"),
+            "punctuation" => new Color("dcdcdc"),
+
+            // Misc
+            "excluded code" => new Color("a9a9a9"),
+
+            _ => new Color("dcdcdc")
+        };
+    }
 }

src/SharpIDE.Godot/IdeRoot.cs

@@ -37,8 +37,11 @@ public partial class IdeRoot : Control
 			var diFile = infraProject.Files.Single(s => s.Name == "DependencyInjection.cs");
 			var fileContents = await File.ReadAllTextAsync(diFile.Path);
 			_sharpIdeCodeEdit.SetText(fileContents);
+			var syntaxHighlighting = await RoslynAnalysis.GetDocumentSyntaxHighlighting(diFile);
+			_sharpIdeCodeEdit.ProvideSyntaxHighlighting(syntaxHighlighting);
 			var diagnostics = await RoslynAnalysis.GetDocumentDiagnostics(diFile);
 			_sharpIdeCodeEdit.ProvideDiagnostics(diagnostics);
+			
 		}
 		catch (Exception e)
 		{

src/SharpIDE.Godot/IdeRoot.tscn

@@ -51,7 +51,10 @@ layout_mode = 2
 [node name="SharpIdeCodeEdit" type="CodeEdit" parent="VBoxContainer/HBoxContainer/HSplitContainer"]
 unique_name_in_owner = true
 layout_mode = 2
+theme_override_colors/current_line_color = Color(0.0588235, 0.0588235, 0.0588235, 1)
+theme_override_colors/background_color = Color(0.117647, 0.117647, 0.117647, 1)
 theme_override_fonts/font = ExtResource("2_rk34b")
+theme_override_font_sizes/font_size = 18
 highlight_current_line = true
 gutters_draw_line_numbers = true
 code_completion_enabled = true

src/SharpIDE.Godot/SharpIdeCodeEdit.cs

@@ -1,6 +1,8 @@
+using System.Collections.Generic;
 using System.Collections.Immutable;
 using Godot;
 using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Classification;
 
 namespace SharpIDE.Godot;
 
@@ -12,6 +14,8 @@ public partial class SharpIdeCodeEdit : CodeEdit
 	private int _currentLine;
 	private int _selectionStartCol;
 	private int _selectionEndCol;
+	
+	private CustomHighlighter _syntaxHighlighter = new();
 
 	private ImmutableArray<Diagnostic> _diagnostics = [];
 	
@@ -27,7 +31,7 @@ public partial class SharpIdeCodeEdit : CodeEdit
 			_currentLine = GetCaretLine();
 			GD.Print($"Selection changed to line {_currentLine}, start {_selectionStartCol}, end {_selectionEndCol}");
 		};
-		this.SyntaxHighlighter = new CustomHighlighter();
+		this.SyntaxHighlighter = _syntaxHighlighter;
 	}
 	
 	public void UnderlineRange(int line, int caretStartCol, int caretEndCol, Color color, float thickness = 1.5f)
@@ -85,6 +89,12 @@ public partial class SharpIdeCodeEdit : CodeEdit
 	{
 		_diagnostics = diagnostics;
 	}
+	public void ProvideSyntaxHighlighting(IEnumerable<(FileLinePositionSpan fileSpan, ClassifiedSpan classifiedSpan)> classifiedSpans)
+	{
+		_syntaxHighlighter.ClassifiedSpans = classifiedSpans;
+		_syntaxHighlighter.UpdateCache(); // not sure if correct
+		QueueRedraw(); // TODO: Not working
+	}
 
 	private void OnCodeFixesRequested()
 	{