public override DynamicMetaObject BindUnaryOperation(UnaryOperationBinder binder)
{
if (binder.Operation != ExprType.Negate)
{
throw new Exception(); // TODO
}
var expression = MetamethodFallbacks.UnaryMinus(null, this);
return(new DynamicMetaObject(expression, RuntimeHelpers.MergeTypeRestrictions(this)));
}
public override DynamicMetaObject BindBinaryOperation(BinaryOperationBinder binder, DynamicMetaObject arg)
{
if (!LuaBinaryOperationBinder.BinaryExprTypes.ContainsKey(binder.Operation))
{
throw new Exception(); // TODO
}
var expression = MetamethodFallbacks.BinaryOp(null, binder.Operation, this, arg);
return(new DynamicMetaObject(expression, RuntimeHelpers.MergeTypeRestrictions(this)));
}
public override DynamicMetaObject BindGetIndex(GetIndexBinder binder, DynamicMetaObject[] indexes)
{
var valueVar = Expr.Variable(typeof(object));
var getValue = Expr.Call(
Expr.Convert(Expression, typeof(LuaTable)),
MemberInfos.LuaTableGetValue,
Expr.Convert(indexes[0].Expression, typeof(object)));
var valueAssign = Expr.Assign(valueVar, getValue);
var expression = Expr.Block(
valueVar,
Expr.Condition(
Expr.Equal(valueVar, Expr.Constant(null)),
MetamethodFallbacks.Index(null, this, indexes),
valueVar));
return(new DynamicMetaObject(expression, RuntimeHelpers.MergeTypeRestrictions(this)));
}
public override DynamicMetaObject BindSetIndex(SetIndexBinder binder, DynamicMetaObject[] indexes, DynamicMetaObject value)
{
var getValue = Expr.Call(
Expr.Convert(Expression, typeof(LuaTable)),
MemberInfos.LuaTableGetValue,
Expr.Convert(indexes[0].Expression, typeof(object)));
var setValue = Expr.Call(
Expr.Convert(Expression, typeof(LuaTable)),
MemberInfos.LuaTableSetValue,
Expr.Convert(indexes[0].Expression, typeof(object)),
Expr.Convert(value.Expression, typeof(object)));
var expression = Expr.Condition(
Expr.Equal(getValue, Expr.Constant(null)),
MetamethodFallbacks.NewIndex(null, this, indexes, value),
setValue);
return(new DynamicMetaObject(expression, RuntimeHelpers.MergeTypeRestrictions(this)));
}
public override DynamicMetaObject BindInvoke(InvokeBinder binder, DynamicMetaObject[] args)
{
var expression = MetamethodFallbacks.Call(null, this, args);
return(new DynamicMetaObject(expression, RuntimeHelpers.MergeTypeRestrictions(this)));
}