/// <summary> Convert the value to an object.
///
/// See ECMA 9.9.
/// </summary>
public static IScriptable ToObject(Context cx, IScriptable scope, object val)
{
if (val is IScriptable)
{
return((IScriptable)val);
}
if (val == null)
{
throw ScriptRuntime.TypeErrorById("msg.null.to.object");
}
if (val == Undefined.Value)
{
throw ScriptRuntime.TypeErrorById("msg.undef.to.object");
}
string className = val is string? "String" : (CliHelper.IsNumber(val) ? "Number" : (val is bool? "Boolean" : null));
if (className != null)
{
object [] args = new object [] { val };
scope = ScriptableObject.GetTopLevelScope(scope);
return(ScriptRuntime.NewObject(cx == null ? Context.CurrentContext : cx, scope, className, args));
}
// Extension: Wrap as a LiveConnect object.
object wrapped = cx.Wrap(scope, val, null);
if (wrapped is IScriptable)
{
return((IScriptable)wrapped);
}
throw ScriptRuntime.errorWithClassName("msg.invalid.type", val);
}
/// <summary> Convert the value to a number.
///
/// See ECMA 9.3.
/// </summary>
public static double ToNumber (object val)
{
for (; ; ) {
if (val is double)
return (double)val;
if (CliHelper.IsNumber (val))
return Convert.ToDouble (val);
if (val == null)
return +0.0;
if (val == Undefined.Value)
return double.NaN;
if (val is string)
return ToNumber ((string)val);
if (val is bool)
return ((bool)val) ? 1 : +0.0;
if (val is IScriptable) {
val = ((IScriptable)val).GetDefaultValue (typeof (long));
if (val is IScriptable)
throw ScriptRuntime.errorWithClassName ("msg.primitive.expected", val);
continue;
}
ScriptRuntime.WarnAboutNonJSObject (val);
return double.NaN;
}
}
/// <summary> Convert the value to a string.
///
/// See ECMA 9.8.
/// </summary>
public static string ToString (object val)
{
for (; ; ) {
if (val == null) {
return "null";
}
if (val == Undefined.Value) {
return "undefined";
}
if (val is string) {
return (string)val;
}
if (val is Boolean)
return ((bool)val) ? "true" : "false";
if (CliHelper.IsNumber (val)) {
// TODO: should we just teach NativeNumber.stringValue()
// TODO: about Numbers?
return ToString (Convert.ToDouble (val), 10);
}
if (val is IScriptable) {
val = ((IScriptable)val).GetDefaultValue (typeof (string));
if (val is IScriptable) {
throw ScriptRuntime.errorWithClassName ("msg.primitive.expected", val);
}
continue;
}
return val.ToString ();
}
}
/// <summary> Convert the value to a boolean.
///
/// See ECMA 9.2.
/// </summary>
public static bool ToBoolean (object val)
{
for (; ; ) {
if (val is bool)
return ((bool)val);
if (val == null || val == Undefined.Value)
return false;
if (val is string)
return ((string)val).Length != 0;
if (CliHelper.IsNumber (val)) {
double d = Convert.ToDouble (val);
return (!double.IsNaN (d) && d != 0.0);
}
if (val is IScriptable) {
if (Context.CurrentContext.VersionECMA1) {
// pure ECMA
return true;
}
// ECMA extension
val = ((IScriptable)val).GetDefaultValue (typeof (bool));
if (val is IScriptable)
throw ScriptRuntime.errorWithClassName ("msg.primitive.expected", val);
continue;
}
ScriptRuntime.WarnAboutNonJSObject (val);
return true;
}
}