public Node/*!*/ Represent(object data) {
Node node;
bool ignoreAlias = HasIdentity(data);
object dataKey = data ?? _NullKey;
if (!ignoreAlias) {
if (_representedObjects.TryGetValue(dataKey, out node)) {
if (node == null) {
LinkNode link = new LinkNode();
List<LinkNode> list;
if (!_links.TryGetValue(dataKey, out list)) {
_links.Add(dataKey, list = new List<LinkNode>());
}
list.Add(link);
return link;
}
return node;
}
_representedObjects.Add(dataKey, null);
}
node = CreateNode(data);
if (!ignoreAlias) {
_representedObjects[dataKey] = node;
List<LinkNode> list;
if (_links.TryGetValue(dataKey, out list)) {
_links.Remove(dataKey);
foreach (LinkNode n in list) {
n.Linked = node;
}
}
}
return node;
}
//TODO: remove Ruby-specific stuff from this layer
public Hash ConstructMapping(Node mappingNode)
{
MappingNode map = mappingNode as MappingNode;
if (map == null)
{
throw new ConstructorException("expected a mapping node, but found: " + mappingNode);
}
Hash mapping = new Hash(_globalScope.Context);
LinkedList <Hash> merge = null;
foreach (KeyValuePair <Node, Node> entry in map.Nodes)
{
Node key_v = entry.Key;
Node value_v = entry.Value;
if (key_v.Tag == "tag:yaml.org,2002:merge")
{
if (merge != null)
{
throw new ConstructorException("while constructing a mapping: found duplicate merge key");
}
SequenceNode sequence;
merge = new LinkedList <Hash>();
if (value_v is MappingNode)
{
merge.AddLast(ConstructMapping(value_v));
}
else if ((sequence = value_v as SequenceNode) != null)
{
foreach (Node subNode in sequence.Nodes)
{
if (!(subNode is MappingNode))
{
throw new ConstructorException("while constructing a mapping: expected a mapping for merging, but found: " + subNode);
}
merge.AddFirst(ConstructMapping(subNode));
}
}
else
{
throw new ConstructorException("while constructing a mapping: expected a mapping or list of mappings for merging, but found: " + value_v);
}
}
else if (key_v.Tag == "tag:yaml.org,2002:value")
{
if (mapping.ContainsKey("="))
{
throw new ConstructorException("while construction a mapping: found duplicate value key");
}
mapping.Add("=", ConstructObject(value_v));
}
else
{
object kk = ConstructObject(key_v);
object vv = ConstructObject(value_v);
LinkNode linkNode = vv as LinkNode;
if (linkNode != null)
{
AddFixer(linkNode.Linked, delegate(Node node, object real) {
IDictionaryOps.SetElement(_globalScope.Context, mapping, kk, real);
});
}
IDictionaryOps.SetElement(_globalScope.Context, mapping, kk, vv);
}
}
if (null != merge)
{
merge.AddLast(mapping);
mapping = new Hash(_globalScope.Context);
foreach (Hash m in merge)
{
foreach (KeyValuePair <object, object> e in m)
{
IDictionaryOps.SetElement(_globalScope.Context, mapping, e.Key, e.Value);
}
}
}
return(mapping);
}