Add: string.rep

src/Lua/Standard/OpenLibExtensions.cs

@@ -79,6 +79,7 @@ public static class OpenLibExtensions
     static readonly LuaFunction[] stringFunctions = [
         LenFunction.Instance,
         LowerFunction.Instance,
+        RepFunction.Instance,
         ReverseFunction.Instance,
         UpperFunction.Instance,
     ];

src/Lua/Standard/Text/RepFunction.cs

@@ -0,0 +1,29 @@
+
+using System.Text;
+
+namespace Lua.Standard.Text;
+
+public sealed class RepFunction : LuaFunction
+{
+    public override string Name => "rep";
+    public static readonly RepFunction Instance = new();
+
+    protected override ValueTask<int> InvokeAsyncCore(LuaFunctionExecutionContext context, Memory<LuaValue> buffer, CancellationToken cancellationToken)
+    {
+        var s = context.GetArgument<string>(0);
+        var n_arg = context.GetArgument<double>(1);
+
+        LuaRuntimeException.ThrowBadArgumentIfNumberIsNotInteger(context.State, this, 2, n_arg);
+
+        var n = (int)n_arg;
+
+        var builder = new ValueStringBuilder(s.Length * n);
+        for (int i = 0; i < n; i++)
+        {
+            builder.Append(s);
+        }
+
+        buffer.Span[0] = builder.ToString();
+        return new(1);
+    }
+}