/// <summary>
/// Expect DOCUMENT-START or STREAM-END.
/// </summary>
private void EmitDocumentStart(Event evt, bool isFirst)
{
DocumentStart documentStart = evt as DocumentStart;
if (documentStart != null)
{
bool isImplicit = documentStart.IsImplicit && isFirst && !isCanonical;
if (documentStart.Version != null && isOpenEnded)
{
WriteIndicator("...", true, false, false);
WriteIndent();
}
if (documentStart.Version != null)
{
AnalyzeVersionDirective(documentStart.Version);
isImplicit = false;
WriteIndicator("%YAML", true, false, false);
WriteIndicator(string.Format(CultureInfo.InvariantCulture, "{0}.{1}", Constants.MajorVersion, Constants.MinorVersion), true, false, false);
WriteIndent();
}
if (documentStart.Tags != null)
{
foreach (var tagDirective in documentStart.Tags)
{
AppendTagDirective(tagDirective, false);
}
}
foreach (var tagDirective in Constants.DefaultTagDirectives)
{
AppendTagDirective(tagDirective, true);
}
if (documentStart.Tags != null && documentStart.Tags.Count != 0)
{
isImplicit = false;
foreach (var tagDirective in documentStart.Tags)
{
WriteIndicator("%TAG", true, false, false);
WriteTagHandle(tagDirective.Handle);
WriteTagContent(tagDirective.Prefix, true);
WriteIndent();
}
}
if (CheckEmptyDocument())
{
isImplicit = false;
}
if (!isImplicit)
{
WriteIndent();
WriteIndicator("---", true, false, false);
if (isCanonical)
{
WriteIndent();
}
}
state = EmitterState.YAML_EMIT_DOCUMENT_CONTENT_STATE;
}
else if (evt is IStreamEnd)
{
if (isOpenEnded)
{
WriteIndicator("...", true, false, false);
WriteIndent();
}
state = EmitterState.YAML_EMIT_END_STATE;
}
else
{
throw new YamlException("Expected DOCUMENT-START or STREAM-END");
}
}
/// <summary>
/// Expect a flow key node.
/// </summary>
private void EmitFlowMappingKey(Event evt, bool isFirst)
{
if (isFirst)
{
WriteIndicator("{", true, true, false);
IncreaseIndent(true, false);
++flowLevel;
}
if (evt is IMappingEnd)
{
--flowLevel;
indent = indents.Pop();
if (isCanonical && !isFirst)
{
WriteIndicator(",", false, false, false);
WriteIndent();
}
WriteIndicator("}", false, false, false);
state = states.Pop();
return;
}
if (!isFirst)
{
WriteIndicator(",", false, false, false);
}
if (isCanonical || column > bestWidth)
{
WriteIndent();
}
if (!isCanonical && CheckSimpleKey())
{
states.Push(EmitterState.YAML_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE);
EmitNode(evt, false, true, true);
}
else
{
WriteIndicator("?", true, false, false);
states.Push(EmitterState.YAML_EMIT_FLOW_MAPPING_VALUE_STATE);
EmitNode(evt, false, true, false);
}
}
/// <summary>
/// Expect the root node.
/// </summary>
private void EmitDocumentContent(Event evt)
{
states.Push(EmitterState.YAML_EMIT_DOCUMENT_END_STATE);
EmitNode(evt, true, false, false);
}
/// <summary>
/// Expect DOCUMENT-END.
/// </summary>
private void EmitDocumentEnd(Event evt)
{
DocumentEnd documentEnd = evt as DocumentEnd;
if (documentEnd != null)
{
WriteIndent();
if (!documentEnd.IsImplicit)
{
WriteIndicator("...", true, false, false);
WriteIndent();
}
state = EmitterState.YAML_EMIT_DOCUMENT_START_STATE;
tagDirectives.Clear();
}
else
{
throw new YamlException("Expected DOCUMENT-END.");
}
}
/// <summary>
/// Expect a block value node.
/// </summary>
private void EmitBlockMappingValue(Event evt, bool isSimple)
{
if (isSimple)
{
WriteIndicator(":", false, false, false);
}
else
{
WriteIndent();
WriteIndicator(":", true, false, true);
}
states.Push(EmitterState.YAML_EMIT_BLOCK_MAPPING_KEY_STATE);
EmitNode(evt, false, true, false);
}
/// <summary>
/// Expect a block item node.
/// </summary>
private void EmitBlockSequenceItem(Event evt, bool isFirst)
{
if (isFirst)
{
IncreaseIndent(false, (isMappingContext && !isIndentation));
}
if (evt is ISequenceEnd)
{
indent = indents.Pop();
state = states.Pop();
return;
}
WriteIndent();
WriteIndicator("-", true, false, true);
states.Push(EmitterState.YAML_EMIT_BLOCK_SEQUENCE_ITEM_STATE);
EmitNode(evt, false, false, false);
}
/// <summary>
/// Check if the evt data is valid.
/// </summary>
private void AnalyzeEvent(Event evt)
{
anchorData.anchor = null;
tagData.handle = null;
tagData.suffix = null;
AnchorAlias alias = evt as AnchorAlias;
if (alias != null)
{
AnalyzeAnchor(alias.Value, true);
return;
}
NodeEvent nodeEvent = evt as NodeEvent;
if (nodeEvent != null)
{
Scalar scalar = evt as Scalar;
if (scalar != null)
{
AnalyzeScalar(scalar.Value);
}
AnalyzeAnchor(nodeEvent.Anchor, false);
if (!string.IsNullOrEmpty(nodeEvent.Tag) && (isCanonical || nodeEvent.IsCanonical))
{
AnalyzeTag(nodeEvent.Tag);
}
return;
}
}
/// <summary>
/// Expect SCALAR.
/// </summary>
private void EmitScalar(Event evt)
{
SelectScalarStyle(evt);
ProcessAnchor();
ProcessTag();
IncreaseIndent(true, false);
ProcessScalar();
indent = indents.Pop();
state = states.Pop();
}
/// <summary>
/// State dispatcher.
/// </summary>
private void StateMachine(Event evt)
{
switch (state)
{
case EmitterState.YAML_EMIT_STREAM_START_STATE:
EmitStreamStart(evt);
break;
case EmitterState.YAML_EMIT_FIRST_DOCUMENT_START_STATE:
EmitDocumentStart(evt, true);
break;
case EmitterState.YAML_EMIT_DOCUMENT_START_STATE:
EmitDocumentStart(evt, false);
break;
case EmitterState.YAML_EMIT_DOCUMENT_CONTENT_STATE:
EmitDocumentContent(evt);
break;
case EmitterState.YAML_EMIT_DOCUMENT_END_STATE:
EmitDocumentEnd(evt);
break;
case EmitterState.YAML_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE:
EmitFlowSequenceItem(evt, true);
break;
case EmitterState.YAML_EMIT_FLOW_SEQUENCE_ITEM_STATE:
EmitFlowSequenceItem(evt, false);
break;
case EmitterState.YAML_EMIT_FLOW_MAPPING_FIRST_KEY_STATE:
EmitFlowMappingKey(evt, true);
break;
case EmitterState.YAML_EMIT_FLOW_MAPPING_KEY_STATE:
EmitFlowMappingKey(evt, false);
break;
case EmitterState.YAML_EMIT_FLOW_MAPPING_SIMPLE_VALUE_STATE:
EmitFlowMappingValue(evt, true);
break;
case EmitterState.YAML_EMIT_FLOW_MAPPING_VALUE_STATE:
EmitFlowMappingValue(evt, false);
break;
case EmitterState.YAML_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE:
EmitBlockSequenceItem(evt, true);
break;
case EmitterState.YAML_EMIT_BLOCK_SEQUENCE_ITEM_STATE:
EmitBlockSequenceItem(evt, false);
break;
case EmitterState.YAML_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE:
EmitBlockMappingKey(evt, true);
break;
case EmitterState.YAML_EMIT_BLOCK_MAPPING_KEY_STATE:
EmitBlockMappingKey(evt, false);
break;
case EmitterState.YAML_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE:
EmitBlockMappingValue(evt, true);
break;
case EmitterState.YAML_EMIT_BLOCK_MAPPING_VALUE_STATE:
EmitBlockMappingValue(evt, false);
break;
case EmitterState.YAML_EMIT_END_STATE:
throw new YamlException("Expected nothing after STREAM-END");
default:
Debug.Assert(false, "Invalid state.");
throw new InvalidOperationException("Invalid state");
}
}
/// <summary>
/// Emit an evt.
/// </summary>
public void Emit(Event @event)
{
events.Enqueue(@event);
while (!NeedMoreEvents())
{
Event current = events.Peek();
AnalyzeEvent(current);
StateMachine(current);
// Only dequeue after calling state_machine because it checks how many events are in the queue.
events.Dequeue();
}
}
/// <summary>
/// Determine an acceptable scalar style.
/// </summary>
private void SelectScalarStyle(Event evt)
{
Scalar scalar = (Scalar)evt;
ScalarStyle style = scalar.Style;
bool noTag = tagData.handle == null && tagData.suffix == null;
if (noTag && !scalar.IsPlainImplicit && !scalar.IsQuotedImplicit)
{
throw new YamlException("Neither tag nor isImplicit flags are specified.");
}
if (style == ScalarStyle.Any)
{
style = scalarData.isMultiline ? ScalarStyle.Folded : ScalarStyle.Plain;
}
if (isCanonical)
{
style = ScalarStyle.DoubleQuoted;
}
if (isSimpleKeyContext && scalarData.isMultiline)
{
style = ScalarStyle.DoubleQuoted;
}
if (style == ScalarStyle.Plain)
{
if ((flowLevel != 0 && !scalarData.isFlowPlainAllowed) || (flowLevel == 0 && !scalarData.isBlockPlainAllowed))
{
style = ScalarStyle.SingleQuoted;
}
if (string.IsNullOrEmpty(scalarData.value) && (flowLevel != 0 || isSimpleKeyContext))
{
style = ScalarStyle.SingleQuoted;
}
if (noTag && !scalar.IsPlainImplicit)
{
style = ScalarStyle.SingleQuoted;
}
}
if (style == ScalarStyle.SingleQuoted)
{
if (!scalarData.isSingleQuotedAllowed)
{
style = ScalarStyle.DoubleQuoted;
}
}
if (style == ScalarStyle.Literal || style == ScalarStyle.Folded)
{
if (!scalarData.isBlockAllowed || flowLevel != 0 || isSimpleKeyContext)
{
style = ScalarStyle.DoubleQuoted;
}
}
// TODO: What is this code supposed to mean?
//if (noTag && !scalar.IsQuotedImplicit && style != ScalarStyle.Plain)
//{
// tagData.handle = "!";
//}
scalarData.style = style;
}
/// <summary>
/// Expect STREAM-START.
/// </summary>
private void EmitStreamStart(Event evt)
{
if (!(evt is IStreamStart))
{
throw new ArgumentException("Expected STREAM-START.", "evt");
}
indent = -1;
line = 0;
column = 0;
isWhitespace = true;
isIndentation = true;
state = EmitterState.YAML_EMIT_FIRST_DOCUMENT_START_STATE;
}
/// <summary>
/// Expect SEQUENCE-START.
/// </summary>
private void EmitSequenceStart(Event evt)
{
ProcessAnchor();
ProcessTag();
SequenceStart sequenceStart = (SequenceStart)evt;
if (flowLevel != 0 || isCanonical || sequenceStart.Style == SequenceStyle.Flow || CheckEmptySequence())
{
state = EmitterState.YAML_EMIT_FLOW_SEQUENCE_FIRST_ITEM_STATE;
}
else
{
state = EmitterState.YAML_EMIT_BLOCK_SEQUENCE_FIRST_ITEM_STATE;
}
}
/// <summary>
/// Expect a flow value node.
/// </summary>
private void EmitFlowMappingValue(Event evt, bool isSimple)
{
if (isSimple)
{
WriteIndicator(":", false, false, false);
}
else
{
if (isCanonical || column > bestWidth)
{
WriteIndent();
}
WriteIndicator(":", true, false, false);
}
states.Push(EmitterState.YAML_EMIT_FLOW_MAPPING_KEY_STATE);
EmitNode(evt, false, true, false);
}
/// <summary>
/// Expect a block key node.
/// </summary>
private void EmitBlockMappingKey(Event evt, bool isFirst)
{
if (isFirst)
{
IncreaseIndent(false, false);
}
if (evt is IMappingEnd)
{
indent = indents.Pop();
state = states.Pop();
return;
}
WriteIndent();
if (CheckSimpleKey())
{
states.Push(EmitterState.YAML_EMIT_BLOCK_MAPPING_SIMPLE_VALUE_STATE);
EmitNode(evt, false, true, true);
}
else
{
WriteIndicator("?", true, false, true);
states.Push(EmitterState.YAML_EMIT_BLOCK_MAPPING_VALUE_STATE);
EmitNode(evt, false, true, false);
}
}
/// <summary>
///
/// Expect a flow item node.
/// </summary>
private void EmitFlowSequenceItem(Event evt, bool isFirst)
{
if (isFirst)
{
WriteIndicator("[", true, true, false);
IncreaseIndent(true, false);
++flowLevel;
}
if (evt is ISequenceEnd)
{
--flowLevel;
indent = indents.Pop();
if (isCanonical && !isFirst)
{
WriteIndicator(",", false, false, false);
WriteIndent();
}
WriteIndicator("]", false, false, false);
state = states.Pop();
return;
}
if (!isFirst)
{
WriteIndicator(",", false, false, false);
}
if (isCanonical || column > bestWidth)
{
WriteIndent();
}
states.Push(EmitterState.YAML_EMIT_FLOW_SEQUENCE_ITEM_STATE);
EmitNode(evt, false, false, false);
}
/// <summary>
/// Expect MAPPING-START.
/// </summary>
private void EmitMappingStart(Event evt)
{
ProcessAnchor();
ProcessTag();
MappingStart mappingStart = (MappingStart)evt;
if (flowLevel != 0 || isCanonical || mappingStart.Style == MappingStyle.Flow || CheckEmptyMapping())
{
state = EmitterState.YAML_EMIT_FLOW_MAPPING_FIRST_KEY_STATE;
}
else
{
state = EmitterState.YAML_EMIT_BLOCK_MAPPING_FIRST_KEY_STATE;
}
}