public static IJsValue Add(IEnvironment environment, IJsValue lhs, IJsValue rhs)
{
if ((lhs.ToPrimitive() is string) || (rhs.ToPrimitive() is string))
{
return environment.CreateString(lhs.ToString() + rhs.ToString());
}
return ArithEval(environment, lhs, rhs, (l, r) => l + r);
}
public override IReference GetReference(IJsValue name)
{
var index = name.ToArrayIndex();
if (index.HasValue && (index >= 0))
{
return GetElementReference(index.Value);
}
return base.GetReference(name.ToString());
}
public static IJsValue RelationalEval(IEnvironment environment, IJsValue lhs, IJsValue rhs,
Func<double, double, bool> relationalOperator,
Func<string, string, bool> stringRelationalOperator)
{
if ((lhs.ToPrimitive() is string) || (rhs.ToPrimitive() is string))
{
return environment.CreateBool(stringRelationalOperator(lhs.ToString(), rhs.ToString()));
}
var ln = lhs.ToNumber();
if (double.IsNaN(ln))
{
return JsUndefined.Value;
}
var rn = rhs.ToNumber();
if (double.IsNaN(rn))
{
return JsUndefined.Value;
}
return environment.CreateBool(relationalOperator(ln, rn));
}
public virtual IReference GetReference(IJsValue name)
{
return GetReference(name.ToString());
}
