public bool MoveNext()
{
if (_source.IsEmpty)
{
_current = default;
return(false);
}
var state = State.Start;
var savedRune = default(RuneCategory);
var savedIndex = 0;
var handleFormatExtend = true;
const State BreakMask = State.BreakConsumeLast | State.BreakConsumeNone;
const State StateMask = ~BreakMask;
var previousZwt = _currentRune.Category == RuneWordCategory.Zwj;
var currentRune = _currentRune;
var currentIndex = 0;
while (currentIndex < _source.Length)
{
if (currentRune.Category == RuneWordCategory.None)
{
currentRune = DecodeRune(_source, currentIndex);
}
_currentRune = default;
if (state != State.Start)
{
if (currentRune.Category == RuneWordCategory.Extend ||
currentRune.Category == RuneWordCategory.Format ||
currentRune.Category == RuneWordCategory.Zwj)
{
handleFormatExtend = false;
goto Continue;
}
}
if (previousZwt && RuneInfo.IsEmoji(currentRune.Rune))
{
state = State.Emoji;
goto Continue;
}
state = state switch
{
State.Start => currentRune.Category switch
{
RuneWordCategory.ALetter => State.AHLetter,
RuneWordCategory.HLetter => State.HLetter,
RuneWordCategory.Numeric => State.Numeric,
RuneWordCategory.Katakana => State.Katakana,
RuneWordCategory.ExtendNumLet => State.ExtendNumLet,
RuneWordCategory.RegionalIndicator => State.RegionalIndicatorHalf,
RuneWordCategory.Zwj => State.Zwj,
RuneWordCategory.WSegSpace => State.WSegSpace,
RuneWordCategory.Cr => HandleStartCr(ref this),
RuneWordCategory.Lf => State.BreakConsumeLast,
RuneWordCategory.Newline => State.BreakConsumeLast,
_ => HandleStart(ref this)
},
internal WordBoundaryEnumerator(ReadOnlySpan <char> source)
{
_source = source;
_current = default;
_currentRune = default;
}
