public static EcmaValue Plus(EcmaState state, EcmaValue left, EcmaValue right)
{
if (left.ToPrimitiv(state) is String || right.ToPrimitiv(state) is String)
{
return(EcmaValue.String(left.ToString(state) + right.ToString(state)));
}
return(EcmaValue.Number(left.ToNumber(state) + right.ToNumber(state)));
}
public static bool IsEquel(EcmaState state, EcmaValue x, EcmaValue y)
{
if (x.Type() == y.Type())
{
if (x.IsUndefined() || x.IsNull())
{
return(true);
}
if (x.IsNumber())
{
double xn = x.ToNumber(state);
double yn = y.ToNumber(state);
if (Double.IsNaN(xn) || Double.IsNaN(yn))
{
return(false);
}
if (xn == +0 && yn == -0 || xn == -0 && yn == +0)
{
return(true);
}
return(xn == yn);
}
if (x.IsString())
{
return(x.ToString(state) == y.ToString(state));
}
if (x.IsBoolean())
{
return(x.ToBoolean(state) == y.ToBoolean(state));
}
return(y.ToObject(state) == x.ToObject(state));
}
if (x.IsNull() && y.IsUndefined() || x.IsUndefined() && y.IsUndefined())
{
return(true);
}
if (!(x.IsNumber() || x.IsString()) && y.IsObject() || x.IsObject() && !(y.IsNumber() || y.IsString()))
{
return(x.ToPrimitiv(state) == y.ToPrimitiv(state));
}
return(x.ToNumber(state) == y.ToNumber(state));
}
