public static object DeepCopy(RubyContext /*!*/ context, object obj)
{
using (IDisposable handle = _infiniteCopyTracker.TrackObject(obj)) {
if (handle == null)
{
return(RubyExceptions.CreateArgumentError("unable to deep copy recursive structure"));
}
else
{
RubyContext ec = RubyUtils.GetExecutionContext(context);
if (RubyUtils.IsRubyValueType(obj))
{
return(obj);
}
object copy;
// TODO: special case class objects:
RubyClass classObject = obj as RubyClass;
if (classObject != null)
{
copy = classObject.Duplicate();
}
else
{
copy = RubySites.Allocate(context, ec.GetClassOf(obj));
}
SymbolId[] names = ec.GetInstanceVariableNames(obj);
RubyInstanceData newVars = (names.Length > 0) ? ec.GetInstanceData(copy) : null;
foreach (SymbolId name in names)
{
object value;
if (!ec.TryGetInstanceVariable(obj, name, out value))
{
value = null;
}
else
{
value = DeepCopy(context, value);
}
newVars.SetInstanceVariable(name, value);
}
if (classObject == null)
{
// do any special copying needed for library types
// TODO: we still need to implement copy semantics for .NET types in general
IDuplicable duplicable = copy as IDuplicable;
if (duplicable != null)
{
duplicable.InitializeFrom(obj);
}
}
return(copy);
}
}
}
private void WriteAnObject(object obj)
{
if (_recursionLimit == 0)
{
throw RubyExceptions.CreateArgumentError("exceed depth limit");
}
if (_recursionLimit > 0)
{
_recursionLimit--;
}
if (obj is int)
{
int value = (int)obj;
if (value < -(1 << 30) || value >= (1 << 30))
{
obj = (BigInteger)value;
}
}
// TODO: use RubyUtils.IsRubyValueType?
RubySymbol sym;
if (obj == null)
{
_writer.Write((byte)'0');
}
else if (obj is bool)
{
_writer.Write((byte)((bool)obj ? 'T' : 'F'));
}
else if (obj is int)
{
WriteFixnum((int)obj);
}
else if ((sym = obj as RubySymbol) != null)
{
// TODO (encoding):
WriteSymbol(sym.ToString(), sym.Encoding);
}
else
{
int objectRef;
if (_objects.TryGetValue(obj, out objectRef))
{
_writer.Write((byte)'@');
WriteInt32(objectRef);
}
else
{
objectRef = _objects.Count;
_objects[obj] = objectRef;
// TODO: replace with a table-driven implementation
// TODO: visibility?
bool implementsDump = _context.ResolveMethod(obj, "_dump", VisibilityContext.AllVisible).Found;
bool implementsMarshalDump = _context.ResolveMethod(obj, "marshal_dump", VisibilityContext.AllVisible).Found;
bool writeInstanceData = false;
string[] instanceNames = null;
if (!implementsDump && !implementsMarshalDump)
{
// Neither "_dump" nor "marshal_dump" writes instance vars separately
instanceNames = _context.GetInstanceVariableNames(obj);
if (instanceNames.Length > 0)
{
_writer.Write((byte)'I');
writeInstanceData = true;
}
}
if (!implementsDump || implementsMarshalDump)
{
// "_dump" doesn't write "extend" info but "marshal_dump" does
RubyClass theClass = _context.GetImmediateClassOf(obj);
if (theClass.IsSingletonClass)
{
foreach (var mixin in theClass.GetMixins())
{
_writer.Write((byte)'e');
WriteModuleName(mixin);
}
}
}
if (obj is double)
{
WriteFloat((double)obj);
}
else if (obj is float)
{
WriteFloat((double)(float)obj);
}
else if (obj is BigInteger)
{
WriteBignum((BigInteger)obj);
}
else if (implementsMarshalDump)
{
WriteUsingMarshalDump(obj);
}
else if (implementsDump)
{
WriteUsingDump(obj);
}
else if (obj is MutableString)
{
WriteString((MutableString)obj);
}
else if (obj is RubyArray)
{
WriteArray((RubyArray)obj);
}
else if (obj is Hash)
{
WriteHash((Hash)obj);
}
else if (obj is RubyRegex)
{
WriteRegex((RubyRegex)obj);
}
else if (obj is RubyClass)
{
WriteClass((RubyClass)obj);
}
else if (obj is RubyModule)
{
WriteModule((RubyModule)obj);
}
else if (obj is RubyStruct)
{
WriteStruct((RubyStruct)obj);
}
else if (obj is Range)
{
WriteRange((Range)obj);
}
else
{
if (writeInstanceData)
{
// Overwrite the "I"; we always have instance data
_writer.BaseStream.Seek(-1, SeekOrigin.Current);
}
else
{
writeInstanceData = true;
}
WriteObject(obj);
}
if (writeInstanceData)
{
WriteInt32(instanceNames.Length);
var encoding = _context.GetIdentifierEncoding();
foreach (string name in instanceNames)
{
object value;
if (!_context.TryGetInstanceVariable(obj, name, out value))
{
value = null;
}
// TODO (encoding):
WriteSymbol(name, encoding);
WriteAnObject(value);
}
}
}
}
if (_recursionLimit >= 0)
{
_recursionLimit++;
}
}
public static RubyArray/*!*/ InstanceVariables(RubyContext/*!*/ context, object self) {
string[] names = context.GetInstanceVariableNames(self);
RubyArray result = new RubyArray(names.Length);
foreach (string name in names) {
result.Add(MutableString.Create(name));
}
return result;
}
public static RubyArray /*!*/ ToYamlProperties(RubyContext /*!*/ context, object self)
{
string[] names = context.GetInstanceVariableNames(self);
Array.Sort(names);
return(context.StringifyIdentifiers(names));
}
public static RubyArray/*!*/ GetInstanceVariableNames(RubyContext/*!*/ context, object self) {
return context.StringifyIdentifiers(context.GetInstanceVariableNames(self));
}
public static RubyArray ToYamlProperties(RubyContext/*!*/ context, object self)
{
string[] names = context.GetInstanceVariableNames(self);
Array.Sort(names);
return context.StringifyIdentifiers(names);
}