Add: bit32.replace

src/Lua/Standard/Bitwise/ReplaceFunction.cs

@@ -0,0 +1,36 @@
+namespace Lua.Standard.Bitwise;
+
+public sealed class ReplaceFunction : LuaFunction
+{
+    public override string Name => "replace";
+    public static readonly ReplaceFunction Instance = new();
+
+    protected override ValueTask<int> InvokeAsyncCore(LuaFunctionExecutionContext context, Memory<LuaValue> buffer, CancellationToken cancellationToken)
+    {
+        var arg0 = context.GetArgument<double>(0);
+        var arg1 = context.GetArgument<double>(1);
+        var arg2 = context.GetArgument<double>(2);
+        var arg3 = context.HasArgument(3)
+            ? context.GetArgument<double>(3)
+            : 1;
+
+        LuaRuntimeException.ThrowBadArgumentIfNumberIsNotInteger(context.State, this, 1, arg0);
+        LuaRuntimeException.ThrowBadArgumentIfNumberIsNotInteger(context.State, this, 2, arg1);
+        LuaRuntimeException.ThrowBadArgumentIfNumberIsNotInteger(context.State, this, 3, arg2);
+        LuaRuntimeException.ThrowBadArgumentIfNumberIsNotInteger(context.State, this, 4, arg3);
+
+        var n = (uint)arg0;
+        var v = (uint)arg1;
+        var field = (int)arg2;
+        var width = (int)arg3;
+
+        Bit32Helper.ValidateFieldAndWidth(context.State, this, 2, field, width);
+
+        var mask = Bit32Helper.GetNBitMask(width) << field;
+        n &= ~mask;
+        v &= mask;
+        n |= v;
+        buffer.Span[0] = n;
+        return new(1);
+    }
+}

src/Lua/Standard/OpenLibExtensions.cs

@@ -107,6 +107,7 @@ public static class OpenLibExtensions
         BtestFunction.Instance,
         BxorFunction.Instance,
         ExtractFunction.Instance,
+        ReplaceFunction.Instance,
     ];
 
     public static void OpenBasicLibrary(this LuaState state)