public static bool UpCastCompare(object l, object r, string opName)
{
if (!(l is IComparable) || !(r is IComparable))
{
return(false);
}
var lv = l;
var rv = r;
if (lv.GetType() != rv.GetType())
{
if (!UpCastEx.UpCast(ref lv, ref rv))
{
return(false);
}
}
switch (opName)
{
case ">":
return(((IComparable)lv).CompareTo(rv) > 0);
case ">=":
return(((IComparable)lv).CompareTo(rv) >= 0);
case "<":
return(((IComparable)lv).CompareTo(rv) < 0);
case "<=":
return(((IComparable)lv).CompareTo(rv) <= 0);
}
return(false);
}
private T EvaluateBetween(object l, object v)
{
if (l is IComparable left && v is IList list && list.Count == 2)
{
if (list[0] is T f && list[1] is T s)
{
return(Monad.Bind(f, s, EvaluateBetweenItems));
T EvaluateBetweenItems(object first, object second)
{
int frCmp = -1;
int toCmp = 1;
if (first?.GetType() == l?.GetType() || UpCastEx.UpCast(ref first, ref l))
{
frCmp = left.CompareTo(first);
}
if (second?.GetType() == l?.GetType() || UpCastEx.UpCast(ref second, ref l))
{
toCmp = left.CompareTo(second);
}
return(Monad.Lift(frCmp >= 0 && toCmp <= 0));
}
}
}
return(Monad.Lift(false));
}
public override T Evaluate(object l, object r)
{
if (l is IComparable cl && r?.GetType() == l?.GetType())
{
return(Monad.Lift(cl.CompareTo(r) > 0));
}
if (l == null || r == null)
{
return(Monad.Unit);
}
if (UpCastEx.UpCast(ref l, ref r) && l is IComparable lc)
{
return(Monad.Lift(lc.CompareTo(r) > 0));
}
return(Monad.Unit);
}
public override T Evaluate(object lv, object rv)
{
var l = lv;
var r = rv;
if (lv?.GetType() != rv?.GetType() &&
!UpCastEx.UpCast(ref l, ref r))
{
return(Monad.Unit);
}
switch (l)
{
case double d:
return(Monad.Lift(d / (double)r));
case int i:
return(Monad.Lift(i / (int)r));
case long lo:
return(Monad.Lift(lo / (long)r));
case decimal de:
return(Monad.Lift(de / (decimal)r));
case float de:
return(Monad.Lift(de / (float)r));
case short de:
return(Monad.Lift(de / (short)r));
case byte de:
return(Monad.Lift(de / (byte)r));
}
return(Monad.Unit);
}
public override T Evaluate(object lv, object rv)
{
var l = lv;
var r = rv;
if (lv?.GetType() != rv?.GetType() &&
!UpCastEx.UpCast(ref l, ref r))
{
return(Monad.Unit);
}
switch (l)
{
case double d:
return(Monad.Lift(Math.Pow(d, (double)r)));
case int i:
return(Monad.Lift(Math.Pow(i, (int)r)));
case long lo:
return(Monad.Lift(Math.Pow(lo, (long)r)));
case decimal de:
return(Monad.Lift(Math.Pow((double)de, (double)(decimal)r)));
case float f:
return(Monad.Lift(Math.Pow(f, (float)r)));
case short s:
return(Monad.Lift(Math.Pow(s, (short)r)));
case byte b:
return(Monad.Lift(Math.Pow(b, (byte)r)));
}
return(Monad.Unit);
}
public override T Evaluate(object lv, object rv)
{
var l = lv;
var r = rv;
if (lv is DateTime dt)
{
switch (rv)
{
case TimeSpan rts:
return(Monad.Lift(dt.Add(rts)));
case int days:
return(Monad.Lift(dt.AddDays(days)));
case double days:
return(Monad.Lift(dt.AddDays(days)));
}
}
if (lv is DateTimeOffset dto)
{
switch (rv)
{
case TimeSpan rts:
return(Monad.Lift(dto.Add(rts)));
case int days:
return(Monad.Lift(dto.AddDays(days)));
case double days:
return(Monad.Lift(dto.AddDays(days)));
}
}
if (l is string || r is string)
{
return(Monad.Lift("" + l + r));
}
if (lv?.GetType() != rv?.GetType() &&
!UpCastEx.UpCast(ref l, ref r))
{
return(Monad.Unit);
}
switch (l)
{
case double d:
return(Monad.Lift(d + (double)r));
case int i:
return(Monad.Lift(i + (int)r));
case long lo:
return(Monad.Lift(lo + (long)r));
case decimal de:
return(Monad.Lift(de + (decimal)r));
case TimeSpan ts:
return(Monad.Lift(ts + (TimeSpan)r));
case float de:
return(Monad.Lift(de + (float)r));
case short de:
return(Monad.Lift(de + (short)r));
case byte de:
return(Monad.Lift(de + (byte)r));
}
return(Monad.Unit);
}
public override T Evaluate(object lv, object rv)
{
var l = lv;
var r = rv;
if (lv is DateTime dt)
{
switch (rv)
{
case DateTime rdt:
return(Monad.Lift(dt.Subtract(rdt)));
case TimeSpan rts:
return(Monad.Lift(dt.Subtract(rts)));
case DateTimeOffset rdto:
return(Monad.Lift(dt.Subtract(rdto.DateTime)));
}
}
if (lv is DateTimeOffset dto)
{
switch (rv)
{
case DateTimeOffset rdto:
return(Monad.Lift(dto.Subtract(rdto)));
case DateTime rdt:
return(Monad.Lift(dto.Subtract(rdt)));
case TimeSpan rts:
return(Monad.Lift(dto.Subtract(rts)));
}
}
if (lv?.GetType() != rv?.GetType() &&
!UpCastEx.UpCast(ref l, ref r))
{
return(Monad.Unit);
}
switch (l)
{
case double d:
return(Monad.Lift(d - (double)r));
case int i:
return(Monad.Lift(i - (int)r));
case long lo:
return(Monad.Lift(lo - (long)r));
case decimal de:
return(Monad.Lift(de - (decimal)r));
case TimeSpan ts:
return(Monad.Lift(ts - (TimeSpan)r));
case float de:
return(Monad.Lift(de - (float)r));
case short de:
return(Monad.Lift(de - (short)r));
case byte de:
return(Monad.Lift(de - (byte)r));
}
return(Monad.Unit);
}
