/// <summary> Function.prototype.apply and Function.prototype.call
///
/// See Ecma 15.3.4.[34]
/// </summary>
public static object applyOrCall(bool isApply, Context cx, IScriptable scope, IScriptable thisObj, object [] args)
{
int L = args.Length;
ICallable function;
if (thisObj is ICallable) {
function = (ICallable)thisObj;
}
else {
object value = thisObj.GetDefaultValue (typeof (IFunction));
if (!(value is ICallable)) {
throw ScriptRuntime.NotFunctionError (value, thisObj);
}
function = (ICallable)value;
}
IScriptable callThis = null;
if (L != 0) {
callThis = ScriptConvert.ToObjectOrNull (cx, args [0]);
}
if (callThis == null) {
// This covers the case of args[0] == (null|undefined) as well.
callThis = getTopCallScope (cx);
}
object [] callArgs;
if (isApply) {
// Follow Ecma 15.3.4.3
if (L <= 1) {
callArgs = ScriptRuntime.EmptyArgs;
}
else {
object arg1 = args [1];
if (arg1 == null || arg1 == Undefined.Value) {
callArgs = ScriptRuntime.EmptyArgs;
}
else if (arg1 is BuiltinArray || arg1 is Arguments) {
callArgs = cx.GetElements ((IScriptable)arg1);
}
else {
throw ScriptRuntime.TypeErrorById ("msg.arg.isnt.array");
}
}
}
else {
// Follow Ecma 15.3.4.4
if (L <= 1) {
callArgs = ScriptRuntime.EmptyArgs;
}
else {
callArgs = new object [L - 1];
Array.Copy (args, 1, callArgs, 0, L - 1);
}
}
return function.Call (cx, scope, callThis, callArgs);
}
