Completions

compiler/NubLang.LSP/AstExtensions.cs

@@ -4,6 +4,43 @@ namespace NubLang.LSP;
 
 public static class AstExtensions
 {
+    public static bool ContainsPosition(this Node node, int line, int character)
+    {
+        if (node.Tokens.Count == 0)
+        {
+            return false;
+        }
+
+        var start = node.Tokens.First().Span.Start;
+        var end = node.Tokens.Last().Span.End;
+
+        var startLine = start.Line - 1;
+        var startChar = start.Column - 1;
+        var endLine = end.Line - 1;
+        var endChar = end.Column - 1;
+
+        if (line < startLine || line > endLine) return false;
+
+        if (line > startLine && line < endLine) return true;
+
+        if (startLine == endLine)
+        {
+            return character >= startChar && character <= endChar;
+        }
+
+        if (line == startLine)
+        {
+            return character >= startChar;
+        }
+
+        if (line == endLine)
+        {
+            return character <= endChar;
+        }
+
+        return false;
+    }
+
     public static IEnumerable<Node> EnumerateDescendantsAndSelf(this Node node)
     {
         yield return node;