public override bool Enter(IObjectDescriptor value, IEmitter context)
{
var typeConverter = typeConverters.FirstOrDefault(t => t.Accepts(value.Type));
if (typeConverter != null)
{
typeConverter.WriteYaml(context, value.Value, value.Type);
return false;
}
var convertible = value.Value as IYamlConvertible;
if (convertible != null)
{
convertible.Write(context, nestedObjectSerializer);
return false;
}
#pragma warning disable 0618 // IYamlSerializable is obsolete
var serializable = value.Value as IYamlSerializable;
if (serializable != null)
{
serializable.WriteYaml(context);
return false;
}
#pragma warning restore
return base.Enter(value, context);
}
protected override void TraverseProperties(IObjectDescriptor value, IObjectGraphVisitor visitor, int currentDepth)
{
if (!ReflectionUtility.HasDefaultConstructor(value.Type) && !serializer.Converters.Any(c => c.Accepts(value.Type)))
{
throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, "Type '{0}' cannot be deserialized because it does not have a default constructor or a type converter.", value.Type));
}
base.TraverseProperties(value, visitor, currentDepth);
}
public override bool EnterMapping(IPropertyDescriptor key, IObjectDescriptor value)
{
var defaultValueAttribute = key.GetCustomAttribute<DefaultValueAttribute>();
var defaultValue = defaultValueAttribute != null
? defaultValueAttribute.Value
: GetDefault(key.Type);
return !_objectComparer.Equals(value.Value, defaultValue)
&& base.EnterMapping(key, value);
}
public override bool Enter(IObjectDescriptor value)
{
var alias = aliasProvider.GetAlias(value.Value);
if (alias != null && !emittedAliases.Add(alias))
{
eventEmitter.Emit(new AliasEventInfo(value) { Alias = alias });
return false;
}
return base.Enter(value);
}
private void EmitDocument(IEmitter emitter, IObjectDescriptor graph)
{
var traversalStrategy = CreateTraversalStrategy();
var eventEmitter = CreateEventEmitter(emitter);
var emittingVisitor = CreateEmittingVisitor(emitter, traversalStrategy, eventEmitter, graph);
emitter.Emit(new StreamStart());
emitter.Emit(new DocumentStart());
traversalStrategy.Traverse(graph, emittingVisitor);
emitter.Emit(new DocumentEnd(true));
emitter.Emit(new StreamEnd());
}
protected override bool Enter(IObjectDescriptor value)
{
AnchorAssignment assignment;
if (value.Value != null && assignments.TryGetValue(value.Value, out assignment))
{
if (assignment.Anchor == null)
{
assignment.Anchor = "o" + nextId.ToString(CultureInfo.InvariantCulture);
++nextId;
}
return false;
}
return true;
}
public override bool Enter(IObjectDescriptor value)
{
var typeConverter = typeConverters.FirstOrDefault(t => t.Accepts(value.Type));
if (typeConverter != null)
{
typeConverter.WriteYaml(emitter, value.Value, value.Type);
return false;
}
var serializable = value as IYamlSerializable;
if (serializable != null)
{
serializable.WriteYaml(emitter);
return false;
}
return base.Enter(value);
}
private IObjectGraphVisitor CreateEmittingVisitor(IEmitter emitter, IObjectGraphTraversalStrategy traversalStrategy, IEventEmitter eventEmitter, IObjectDescriptor graph)
{
IObjectGraphVisitor emittingVisitor = new EmittingObjectGraphVisitor(eventEmitter);
emittingVisitor = new CustomSerializationObjectGraphVisitor(emitter, emittingVisitor, Converters);
if (!IsOptionSet(SerializationOptions.DisableAliases))
{
var anchorAssigner = new AnchorAssigner();
traversalStrategy.Traverse(graph, anchorAssigner);
emittingVisitor = new AnchorAssigningObjectGraphVisitor(emittingVisitor, eventEmitter, anchorAssigner);
}
if (!IsOptionSet(SerializationOptions.EmitDefaults))
{
emittingVisitor = new DefaultExclusiveObjectGraphVisitor(emittingVisitor);
}
return emittingVisitor;
}
bool IObjectGraphVisitor.Enter(IObjectDescriptor value)
{
// Do not assign anchors to basic types
if (value.Value == null || value.Type.GetTypeCode() != TypeCode.Object)
{
return false;
}
AnchorAssignment assignment;
if (assignments.TryGetValue(value.Value, out assignment))
{
if (assignment.Anchor == null)
{
assignment.Anchor = "o" + nextId.ToString(CultureInfo.InvariantCulture);
++nextId;
}
return false;
}
else
{
assignments.Add(value.Value, new AnchorAssignment());
return true;
}
}
public ScalarEventInfo(IObjectDescriptor source)
: base(source)
{
}
protected ObjectEventInfo(IObjectDescriptor source)
: base(source)
{
}
public virtual void VisitMappingStart(IObjectDescriptor mapping, Type keyType, Type valueType)
{
nextVisitor.VisitMappingStart(mapping, keyType, valueType);
}
public virtual void VisitSequenceStart(IObjectDescriptor sequence, Type elementType)
{
nextVisitor.VisitSequenceStart(sequence, elementType);
}
void IObjectGraphVisitor.VisitMappingStart(IObjectDescriptor mapping, Type keyType, Type valueType)
{
eventEmitter.Emit(new MappingStartEventInfo(mapping));
}
protected abstract bool EnterMapping(IObjectDescriptor key, IObjectDescriptor value);
protected abstract bool Enter(IObjectDescriptor value);
private IObjectGraphVisitor <IEmitter> CreateEmittingVisitor(IEmitter emitter, IObjectGraphTraversalStrategy traversalStrategy, IEventEmitter eventEmitter, IObjectDescriptor graph)
{
IObjectGraphVisitor <IEmitter> emittingVisitor = new EmittingObjectGraphVisitor(eventEmitter);
ObjectSerializer nestedObjectSerializer = (v, t) => SerializeValue(emitter, v, t);
emittingVisitor = new CustomSerializationObjectGraphVisitor(emittingVisitor, Converters, nestedObjectSerializer);
if (!IsOptionSet(SerializationOptions.DisableAliases))
{
var anchorAssigner = new AnchorAssigner(Converters);
traversalStrategy.Traverse <Nothing>(graph, anchorAssigner, null);
emittingVisitor = new AnchorAssigningObjectGraphVisitor(emittingVisitor, eventEmitter, anchorAssigner);
}
if (!IsOptionSet(SerializationOptions.EmitDefaults))
{
emittingVisitor = new DefaultExclusiveObjectGraphVisitor(emittingVisitor);
}
return(emittingVisitor);
}
protected virtual void Traverse <TContext>(object name, IObjectDescriptor value, IObjectGraphVisitor <TContext> visitor, TContext context, Stack <ObjectPathSegment> path)
{
if (path.Count >= maxRecursion)
{
var message = new StringBuilder();
message.AppendLine("Too much recursion when traversing the object graph.");
message.AppendLine("The path to reach this recursion was:");
var lines = new Stack <KeyValuePair <string, string> >(path.Count);
var maxNameLength = 0;
foreach (var segment in path)
{
var segmentName = TypeConverter.ChangeType <string>(segment.name);
maxNameLength = Math.Max(maxNameLength, segmentName.Length);
lines.Push(new KeyValuePair <string, string>(segmentName, segment.value.Type.FullName));
}
foreach (var line in lines)
{
message
.Append(" -> ")
.Append(line.Key.PadRight(maxNameLength))
.Append(" [")
.Append(line.Value)
.AppendLine("]");
}
throw new MaximumRecursionLevelReachedException(message.ToString());
}
if (!visitor.Enter(value, context))
{
return;
}
path.Push(new ObjectPathSegment(name, value));
try
{
var typeCode = value.Type.GetTypeCode();
switch (typeCode)
{
case TypeCode.Boolean:
case TypeCode.Byte:
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
case TypeCode.SByte:
case TypeCode.UInt16:
case TypeCode.UInt32:
case TypeCode.UInt64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
case TypeCode.String:
case TypeCode.Char:
case TypeCode.DateTime:
visitor.VisitScalar(value, context);
break;
case TypeCode.Empty:
throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "TypeCode.{0} is not supported.", typeCode));
default:
if (value.IsDbNull())
{
visitor.VisitScalar(new ObjectDescriptor(null, typeof(object), typeof(object)), context);
}
if (value.Value == null || value.Type == typeof(TimeSpan))
{
visitor.VisitScalar(value, context);
break;
}
var underlyingType = Nullable.GetUnderlyingType(value.Type);
if (underlyingType != null)
{
// This is a nullable type, recursively handle it with its underlying type.
// Note that if it contains null, the condition above already took care of it
Traverse("Value", new ObjectDescriptor(value.Value, underlyingType, value.Type, value.ScalarStyle), visitor, context, path);
}
else
{
TraverseObject(value, visitor, context, path);
}
break;
}
}
finally
{
path.Pop();
}
}
public ObjectPathSegment(object name, IObjectDescriptor value)
{
this.name = name;
this.value = value;
}
void IObjectGraphTraversalStrategy.Traverse <TContext>(IObjectDescriptor graph, IObjectGraphVisitor <TContext> visitor, TContext context)
{
Traverse("<root>", graph, visitor, context, new Stack <ObjectPathSegment>(maxRecursion));
}
public virtual void VisitSequenceEnd(IObjectDescriptor sequence)
{
nextVisitor.VisitSequenceEnd(sequence);
}
public SequenceStartEventInfo(IObjectDescriptor source)
: base(source)
{
}
bool IObjectGraphVisitor.EnterMapping(IPropertyDescriptor key, IObjectDescriptor value)
{
return true;
}
protected abstract void VisitMappingEnd(IObjectDescriptor mapping);
void IObjectGraphVisitor.VisitSequenceStart(IObjectDescriptor sequence, Type elementType)
{
eventEmitter.Emit(new SequenceStartEventInfo(sequence));
}
protected abstract void VisitMappingStart(IObjectDescriptor mapping, Type keyType, Type valueType);
protected abstract void VisitScalar(IObjectDescriptor scalar);
protected abstract void VisitSequenceEnd(IObjectDescriptor sequence);
public virtual void VisitSequenceEnd(IObjectDescriptor sequence)
{
nextVisitor.VisitSequenceEnd(sequence);
}
protected abstract void VisitSequenceStart(IObjectDescriptor sequence, Type elementType);
public AliasEventInfo(IObjectDescriptor source, string alias)
: base(source)
{
Alias = alias ?? throw new ArgumentNullException(nameof(alias));
}
bool IObjectGraphVisitor <Nothing> .EnterMapping(IObjectDescriptor key, IObjectDescriptor value, Nothing context)
{
return(EnterMapping(key, value));
}
public ScalarEventInfo(IObjectDescriptor source)
: base(source)
{
Style = source.ScalarStyle;
RenderedValue = string.Empty;
}
void IObjectGraphVisitor <Nothing> .VisitMappingEnd(IObjectDescriptor mapping, Nothing context)
{
VisitMappingEnd(mapping);
}
public virtual void VisitScalar(IObjectDescriptor scalar)
{
nextVisitor.VisitScalar(scalar);
}
void IObjectGraphVisitor <Nothing> .VisitMappingStart(IObjectDescriptor mapping, Type keyType, Type valueType, Nothing context)
{
VisitMappingStart(mapping, keyType, valueType);
}
public MappingEndEventInfo(IObjectDescriptor source)
: base(source)
{
}
void IObjectGraphVisitor <Nothing> .VisitScalar(IObjectDescriptor scalar, Nothing context)
{
VisitScalar(scalar);
}
bool IObjectGraphVisitor.Enter(IObjectDescriptor value)
{
return true;
}
void IObjectGraphVisitor <Nothing> .VisitSequenceEnd(IObjectDescriptor sequence, Nothing context)
{
VisitSequenceEnd(sequence);
}
void IObjectGraphVisitor.VisitScalar(IObjectDescriptor scalar)
{
eventEmitter.Emit(new ScalarEventInfo(scalar));
}
public override void VisitMappingStart(IObjectDescriptor mapping, Type keyType, Type valueType)
{
eventEmitter.Emit(new MappingStartEventInfo(mapping) { Anchor = aliasProvider.GetAlias(mapping.Value) });
}
void IObjectGraphVisitor.VisitMappingEnd(IObjectDescriptor mapping)
{
eventEmitter.Emit(new MappingEndEventInfo(mapping));
}
public override void VisitScalar(IObjectDescriptor scalar)
{
eventEmitter.Emit(new ScalarEventInfo(scalar) { Anchor = aliasProvider.GetAlias(scalar.Value) });
}
void IObjectGraphVisitor.VisitSequenceEnd(IObjectDescriptor sequence)
{
eventEmitter.Emit(new SequenceEndEventInfo(sequence));
}
public virtual bool EnterMapping(IPropertyDescriptor key, IObjectDescriptor value)
{
return nextVisitor.EnterMapping(key, value);
}
public override bool EnterMapping(IObjectDescriptor key, IObjectDescriptor value)
{
return !_objectComparer.Equals(value, GetDefault(value.Type))
&& base.EnterMapping(key, value);
}
public virtual void VisitMappingStart(IObjectDescriptor mapping, Type keyType, Type valueType)
{
nextVisitor.VisitMappingStart(mapping, keyType, valueType);
}
void IObjectGraphVisitor <Nothing> .VisitSequenceStart(IObjectDescriptor sequence, Type elementType, Nothing context)
{
VisitSequenceStart(sequence, elementType);
}
public virtual void VisitMappingEnd(IObjectDescriptor mapping)
{
nextVisitor.VisitMappingEnd(mapping);
}
public override void VisitSequenceStart(IObjectDescriptor sequence, Type elementType)
{
eventEmitter.Emit(new SequenceStartEventInfo(sequence) { Anchor = aliasProvider.GetAlias(sequence.Value) });
}
void IObjectGraphTraversalStrategy.Traverse<TContext>(IObjectDescriptor graph, IObjectGraphVisitor<TContext> visitor, TContext context)
{
Traverse(graph, visitor, 0, context);
}
public virtual bool Enter(IObjectDescriptor value)
{
return nextVisitor.Enter(value);
}
protected virtual void Traverse<TContext>(IObjectDescriptor value, IObjectGraphVisitor<TContext> visitor, int currentDepth, TContext context)
{
if (++currentDepth > maxRecursion)
{
throw new InvalidOperationException("Too much recursion when traversing the object graph");
}
if (!visitor.Enter(value, context))
{
return;
}
var typeCode = value.Type.GetTypeCode();
switch (typeCode)
{
case TypeCode.Boolean:
case TypeCode.Byte:
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
case TypeCode.SByte:
case TypeCode.UInt16:
case TypeCode.UInt32:
case TypeCode.UInt64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
case TypeCode.String:
case TypeCode.Char:
case TypeCode.DateTime:
visitor.VisitScalar(value, context);
break;
case TypeCode.Empty:
throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "TypeCode.{0} is not supported.", typeCode));
default:
if (value.IsDbNull())
{
visitor.VisitScalar(new ObjectDescriptor(null, typeof(object), typeof(object)), context);
}
if (value.Value == null || value.Type == typeof(TimeSpan))
{
visitor.VisitScalar(value, context);
break;
}
var underlyingType = Nullable.GetUnderlyingType(value.Type);
if (underlyingType != null)
{
// This is a nullable type, recursively handle it with its underlying type.
// Note that if it contains null, the condition above already took care of it
Traverse(new ObjectDescriptor(value.Value, underlyingType, value.Type, value.ScalarStyle), visitor, currentDepth, context);
}
else
{
TraverseObject(value, visitor, currentDepth, context);
}
break;
}
}
public virtual void VisitMappingEnd(IObjectDescriptor mapping)
{
nextVisitor.VisitMappingEnd(mapping);
}
public MappingEndEventInfo(IObjectDescriptor source)
: base(source)
{
}
public virtual void VisitScalar(IObjectDescriptor scalar)
{
nextVisitor.VisitScalar(scalar);
}
public SequenceEndEventInfo(IObjectDescriptor source)
: base(source)
{
}
public virtual void VisitSequenceStart(IObjectDescriptor sequence, Type elementType)
{
nextVisitor.VisitSequenceStart(sequence, elementType);
}
protected EventInfo(IObjectDescriptor source)
{
Source = source ?? throw new ArgumentNullException(nameof(source));
}
