public static Point ToPoint(this CSSValueList values)
{
if (values.Length == 1)
{
var value = values[0];
var calc = value.ToDistance();
if (calc != null)
{
return(new Point(calc));
}
else if (value.Is(Keywords.Left))
{
return(new Point(x: Percent.Zero));
}
else if (value.Is(Keywords.Right))
{
return(new Point(x: Percent.Hundred));
}
else if (value.Is(Keywords.Top))
{
return(new Point(y: Percent.Zero));
}
else if (value.Is(Keywords.Bottom))
{
return(new Point(y: Percent.Hundred));
}
else if (value.Is(Keywords.Center))
{
return(Point.Centered);
}
}
else if (values.Length == 2)
{
var left = values[0];
var right = values[1];
var horizontal = left.ToDistance();
var vertical = right.ToDistance();
if (horizontal == null)
{
if (left.Is(Keywords.Left))
{
horizontal = Percent.Zero;
}
else if (left.Is(Keywords.Right))
{
horizontal = Percent.Hundred;
}
else if (left.Is(Keywords.Center))
{
horizontal = Percent.Fifty;
}
else if (left.Is(Keywords.Top))
{
horizontal = vertical;
vertical = Percent.Zero;
}
else if (left.Is(Keywords.Bottom))
{
horizontal = vertical;
vertical = Percent.Hundred;
}
}
if (vertical == null)
{
if (right.Is(Keywords.Top))
{
vertical = Percent.Zero;
}
else if (right.Is(Keywords.Bottom))
{
vertical = Percent.Hundred;
}
else if (right.Is(Keywords.Center))
{
vertical = Percent.Fifty;
}
else if (right.Is(Keywords.Left))
{
vertical = horizontal;
horizontal = Percent.Zero;
}
else if (right.Is(Keywords.Right))
{
vertical = horizontal;
horizontal = Percent.Hundred;
}
}
if (horizontal != null && vertical != null)
{
return(new Point(horizontal, vertical));
}
}
else if (values.Length > 2)
{
IDistance shift = null;
IDistance horizontal = Percent.Fifty;
IDistance vertical = Percent.Fifty;
var index = 0;
var value = values[index];
if (value.Is(Keywords.Left))
{
horizontal = Percent.Zero;
shift = values[index + 1].ToDistance();
}
else if (value.Is(Keywords.Right))
{
horizontal = Percent.Hundred;
shift = values[index + 1].ToDistance();
}
else if (!value.Is(Keywords.Center))
{
return(null);
}
if (shift != null)
{
index++;
horizontal = horizontal.Add(shift);
shift = Percent.Zero;
}
value = values[++index];
if (value.Is(Keywords.Top))
{
vertical = Percent.Zero;
if (index + 1 < values.Length)
{
shift = values[index + 1].ToDistance();
}
}
else if (value.Is(Keywords.Bottom))
{
vertical = Percent.Hundred;
if (index + 1 < values.Length)
{
shift = values[index + 1].ToDistance();
}
}
else if (!value.Is(Keywords.Center))
{
return(null);
}
if (shift != null)
{
vertical = vertical.Add(shift);
return(new Point(horizontal, vertical));
}
}
return(null);
}
