private int CompareImpl(Type l, Type r)
{
int value;
if (!CompareUtil.PreCompare(l, r, out value))
{
return(value);
}
// Use default compare if any argument is not type of ValueDrawer.
var root = ValueDrawerTypes.Root;
if (!root.IsAssignableFrom(l) || !root.IsAssignableFrom(r))
{
return(Comparer <Type> .Default.Compare(l, r));
}
var priorities = ValueDrawerPrioritiesForType.Get(ValueType ?? typeof(object));
if (priorities != null)
{
var lg = l.IsGenericType ? l.GetGenericTypeDefinition() : l;
var rg = r.IsGenericType ? r.GetGenericTypeDefinition() : r;
int lp = priorities.GetPriority(lg), rp = priorities.GetPriority(rg);
return(lp.CompareTo(rp));
}
ValueDrawerTypeInfo lInfo = ValueDrawerTypeInfo.Get(l), rInfo = ValueDrawerTypeInfo.Get(r);
if (lInfo != null && rInfo != null)
{
// Interface drawer is more appropriate for interface type.
if (lInfo.IsInterfaceDrawer && !rInfo.IsInterfaceDrawer)
{
return(ValueType.IsInterface ? 1 : -1);
}
if (!lInfo.IsInterfaceDrawer && rInfo.IsInterfaceDrawer)
{
return(ValueType.IsInterface ? -1 : 1);
}
GenericParameterConstraints lcov = lInfo.ConstraintsOnValue, rcov = rInfo.ConstraintsOnValue;
if (lcov != null && rcov != null)
{
if (lcov.TypeCount == 1 && rcov.TypeCount == 1)
{
Type lIf = rcov.GetType(0), rIf = rcov.GetType(0);
if (lIf != rIf)
{
if (lIf.IsAssignableFrom(rIf))
{
return(-1);
}
if (rIf.IsAssignableFrom(lIf))
{
return(1);
}
}
}
}
// The more the drawer type derived, the higher priority it owned.
return(lInfo.DeriveDepth.CompareTo(rInfo.DeriveDepth));
}
return(0);
}
private static void InitDefaultPriorities()
{
var forString = new ValueDrawerPrioritiesForType(typeof(string));
forString.SetPriority(typeof(StringDrawer <>), 1);
}
