public bool MoveNext()
{
if (_currentIndex < 0)
{
while (_innerParser.MoveNext())
{
_allEvents.Add(_innerParser.Current);
}
for (int i = _allEvents.Count - 2; i >= 0; --i)
{
var merge = _allEvents[i] as Scalar;
if (merge != null && merge.Value == "<<")
{
var anchorAlias = _allEvents[i + 1] as AnchorAlias;
if (anchorAlias != null)
{
var mergedEvents = GetMappingEvents(anchorAlias.Value);
_allEvents.RemoveRange(i, 2);
_allEvents.InsertRange(i, mergedEvents);
continue;
}
var sequence = _allEvents[i + 1] as SequenceStart;
if (sequence != null)
{
var mergedEvents = new List<IEnumerable<ParsingEvent>>();
var sequenceEndFound = false;
for (var itemIndex = i + 2; itemIndex < _allEvents.Count; ++itemIndex)
{
anchorAlias = _allEvents[itemIndex] as AnchorAlias;
if (anchorAlias != null)
{
mergedEvents.Add(GetMappingEvents(anchorAlias.Value));
continue;
}
if (_allEvents[itemIndex] is SequenceEnd)
{
_allEvents.RemoveRange(i, itemIndex - i + 1);
_allEvents.InsertRange(i, mergedEvents.SelectMany(e => e));
sequenceEndFound = true;
break;
}
}
if (sequenceEndFound)
{
continue;
}
}
throw new SemanticErrorException(merge.Start, merge.End, "Unrecognized merge key pattern");
}
}
}
var nextIndex = _currentIndex + 1;
if (nextIndex < _allEvents.Count)
{
Current = _allEvents[nextIndex];
_currentIndex = nextIndex;
return true;
}
return false;
}
void IParsingEventVisitor.Visit(MappingStart e)
{
clonedEvent = new MappingStart(null, e.Tag, e.IsImplicit, e.Style, e.Start, e.End);
}
void IParsingEventVisitor.Visit(MappingEnd e)
{
clonedEvent = new MappingEnd(e.Start, e.End);
}
void IParsingEventVisitor.Visit(SequenceEnd e)
{
clonedEvent = new SequenceEnd(e.Start, e.End);
}
void IParsingEventVisitor.Visit(SequenceStart e)
{
clonedEvent = new SequenceStart(null, e.Tag, e.IsImplicit, e.Style, e.Start, e.End);
}
void IParsingEventVisitor.Visit(Scalar e)
{
clonedEvent = new Scalar(null, e.Tag, e.Value, e.Style, e.IsPlainImplicit, e.IsQuotedImplicit, e.Start, e.End);
}
void IParsingEventVisitor.Visit(AnchorAlias e)
{
clonedEvent = new AnchorAlias(e.Value, e.Start, e.End);
}
public ParsingEvent Clone(ParsingEvent e)
{
e.Accept(this);
return clonedEvent;
}