private bool needMoreEvents()
{
if (_events.Count == 0) {
return true;
}
_event = _events.Peek();
if (_event is DocumentStartEvent) {
return needEvents(1);
} else if (_event is SequenceStartEvent) {
return needEvents(2);
} else if (_event is MappingStartEvent) {
return needEvents(3);
} else {
return false;
}
}
private Node ComposeNode(Node parent, object index)
{
Node result;
YamlEvent @event = _parser.PeekEvent();
NodeEvent nodeEvent = @event as NodeEvent;
string anchor = (nodeEvent != null) ? nodeEvent.Anchor : null;
if (nodeEvent is AliasEvent)
{
_parser.GetEvent();
if (!_anchors.TryGetValue(anchor, out result))
{
throw new ComposerException("found undefined alias: " + anchor);
}
return(result);
}
result = null;
//_resolver.descendResolver(parent, index);
if (@event is ScalarEvent)
{
ScalarEvent ev = (ScalarEvent)_parser.GetEvent();
string tag = ev.Tag;
if (tag == null || tag == "!")
{
tag = Resolver.Resolve(typeof(ScalarNode), ev.Value, ev.Implicit);
}
result = new ScalarNode(tag, ev.Value, ev.Style);
if (null != anchor)
{
AddAnchor(anchor, result);
}
}
else if (@event is SequenceStartEvent)
{
SequenceStartEvent start = (SequenceStartEvent)_parser.GetEvent();
string tag = start.Tag;
if (tag == null || tag == "!")
{
tag = Resolver.Resolve(typeof(SequenceNode), null, start.Implicit);
}
SequenceNode seqResult = new SequenceNode(tag, new List <Node>(), start.FlowStyle);
result = seqResult;
if (null != anchor)
{
AddAnchor(anchor, seqResult);
}
int ix = 0;
while (!(_parser.PeekEvent() is SequenceEndEvent))
{
seqResult.Nodes.Add(ComposeNode(seqResult, ix++));
}
_parser.GetEvent();
}
else if (@event is MappingStartEvent)
{
MappingStartEvent start = (MappingStartEvent)_parser.GetEvent();
string tag = start.Tag;
if (tag == null || tag == "!")
{
tag = Resolver.Resolve(typeof(MappingNode), null, start.Implicit);
}
MappingNode mapResult = new MappingNode(tag, new Dictionary <Node, Node>(), start.FlowStyle);
result = mapResult;
if (null != anchor)
{
AddAnchor(anchor, result);
}
while (!(_parser.PeekEvent() is MappingEndEvent))
{
YamlEvent key = _parser.PeekEvent();
Node itemKey = ComposeNode(mapResult, null);
Node composed = ComposeNode(mapResult, itemKey);
if (!mapResult.Nodes.ContainsKey(itemKey))
{
mapResult.Nodes.Add(itemKey, composed);
}
}
_parser.GetEvent();
}
//_resolver.ascendResolver();
return(result);
}
public void Emit(YamlEvent/*!*/ @event)
{
_events.Enqueue(@event);
while (!needMoreEvents()) {
_event = _events.Dequeue();
switch (_state) {
case EmitterState.STREAM_START:
EmitStreamStart();
break;
case EmitterState.FIRST_DOCUMENT_START:
EmitDocumentStart(true);
break;
case EmitterState.DOCUMENT_ROOT:
EmitDocumentRoot();
break;
case EmitterState.NOTHING:
EmitNothing();
break;
case EmitterState.DOCUMENT_START:
EmitDocumentStart(false);
break;
case EmitterState.DOCUMENT_END:
EmitDocumentEnd();
break;
case EmitterState.FIRST_FLOW_SEQUENCE_ITEM:
EmitFlowSequenceItem(true);
break;
case EmitterState.FLOW_SEQUENCE_ITEM:
EmitFlowSequenceItem(false);
break;
case EmitterState.FIRST_FLOW_MAPPING_KEY:
EmitFlowMappingKey(true);
break;
case EmitterState.FLOW_MAPPING_SIMPLE_VALUE:
EmitFlowMappingSimpleValue();
break;
case EmitterState.FLOW_MAPPING_VALUE:
EmitFlowMappingValue();
break;
case EmitterState.FLOW_MAPPING_KEY:
EmitFlowMappingKey(false);
break;
case EmitterState.BLOCK_SEQUENCE_ITEM:
if (_event is SequenceEndEvent) {
_indent = _indents.Pop();
_state = _states.Pop();
} else {
EmitBlockSequenceItem();
}
break;
case EmitterState.FIRST_BLOCK_SEQUENCE_ITEM:
EmitBlockSequenceItem();
break;
case EmitterState.BLOCK_MAPPING_KEY:
if (_event is MappingEndEvent) {
_indent = _indents.Pop();
_state = _states.Pop();
} else {
EmitBlockMappingKey();
}
break;
case EmitterState.FIRST_BLOCK_MAPPING_KEY:
EmitBlockMappingKey();
break;
case EmitterState.BLOCK_MAPPING_SIMPLE_VALUE:
EmitBlockMappingSimpleValue();
break;
case EmitterState.BLOCK_MAPPING_VALUE:
EmitBlockMappingValue();
break;
default:
Debug.Assert(false, "unreachable");
throw new InvalidOperationException("unreachable");
}
_event = null;
}
}