...

compiler/NubLang/Diagnostics/Diagnostic.cs

@@ -105,8 +105,8 @@ public class Diagnostic
             sb.AppendLine();
             var text = File.ReadAllText(Span.Value.FilePath);
 
-            var tokenizer = new Tokenizer(Span.Value.FilePath, text);
-            tokenizer.Tokenize();
+            var tokenizer = new Tokenizer();
+            tokenizer.Tokenize(Span.Value.FilePath, text);
 
             var lines = text.Split('\n');
 

compiler/NubLang/Modules/ModuleRepository.cs

@@ -161,6 +161,12 @@ public sealed class ModuleRepository
         return module;
     }
 
+    public bool TryGet(IdentifierToken ident, [NotNullWhen(true)] out Module? module)
+    {
+        module = _modules.GetValueOrDefault(ident.Value);
+        return module != null;
+    }
+
     public sealed class Module
     {
         public required string Name { get; init; }

compiler/NubLang/Syntax/Parser.cs

@@ -11,14 +11,15 @@ public sealed class Parser
     private Token? CurrentToken => _tokenIndex < _tokens.Count ? _tokens[_tokenIndex] : null;
     private bool HasToken => CurrentToken != null;
 
-    public List<Diagnostic> Diagnostics { get; } = [];
+    public List<Diagnostic> Diagnostics { get; set; } = [];
 
     public SyntaxTree Parse(List<Token> tokens)
     {
-        Diagnostics.Clear();
         _tokens = tokens;
         _tokenIndex = 0;
 
+        Diagnostics = [];
+
         var topLevelSyntaxNodes = new List<TopLevelSyntaxNode>();
 
         while (HasToken)

compiler/NubLang/Syntax/Tokenizer.cs

@@ -4,25 +4,23 @@ namespace NubLang.Syntax;
 
 public sealed class Tokenizer
 {
-    private readonly string _fileName;
-    private readonly string _content;
+    private string _fileName = null!;
+    private string _content = null!;
     private int _index;
     private int _line = 1;
     private int _column = 1;
 
-    public Tokenizer(string fileName, string content)
+    public List<Diagnostic> Diagnostics { get; set; } = new(16);
+    public List<Token> Tokens { get; set; } = new(256);
+
+    public void Tokenize(string fileName, string content)
     {
         _fileName = fileName;
         _content = content;
-    }
 
-    public List<Diagnostic> Diagnostics { get; } = new(16);
-    public List<Token> Tokens { get; } = new(256);
+        Diagnostics = [];
+        Tokens = [];
 
-    public void Tokenize()
-    {
-        Diagnostics.Clear();
-        Tokens.Clear();
         _index = 0;
         _line = 1;
         _column = 1;