private static EastAsianWidthRange Marge(EastAsianWidthRange first, EastAsianWidthRange second)
{
return
(new EastAsianWidthRange(
first.Start,
second.End,
second.Kind));
}
internal static IEnumerable <EastAsianWidthRange> Normalize(this IList <EastAsianWidthRange> ranges)
{
var previous = ranges.First();
foreach (var current in ranges.Skip(1))
{
if (1 < current.Start - previous.End)
{
// If there is a gap between previous and current, fill the gap with Neutral.
if (previous.Kind == EastAsianWidthKind.Neutral)
{
previous =
Marge(
previous,
new EastAsianWidthRange(
previous.End + 1,
current.Start - 1,
EastAsianWidthKind.Neutral));
}
else
{
yield return(previous);
previous =
new EastAsianWidthRange(
previous.End + 1,
current.Start - 1,
EastAsianWidthKind.Neutral);
}
}
if (previous.Kind == current.Kind)
{
previous = Marge(previous, current);
}
else
{
yield return(previous);
previous = current;
}
}
if (previous.Kind == EastAsianWidthKind.Neutral)
{
yield return(new EastAsianWidthRange(previous.Start, int.MaxValue, previous.Kind));
}
else
{
yield return(previous);
yield return(new EastAsianWidthRange(previous.End + 1, int.MaxValue, EastAsianWidthKind.Neutral));
}
}
