/// <summary>
/// Walks the object graph rooted in this node.
/// </summary>
/// <param name="callback">The callback method.</param>
/// <param name="context">Current <see cref="ScriptContext"/>.</param>
public void Walk(PhpWalkCallback callback, ScriptContext context)
{
IPhpObjectGraphNode node = value as IPhpObjectGraphNode;
if (node != null)
{
value = callback(node, context);
node = value as IPhpObjectGraphNode;
if (node != null)
{
node.Walk(callback, context);
}
}
}
/// <summary>
/// Converts instances of user-defined PHP classes to <see cref="stdClass"/>es. Also converts all
/// strings to the <see cref="System.String"/> representation.
/// </summary>
/// <param name="node"></param>
/// <param name="context">Current <see cref="ScriptContext"/>.</param>
/// <returns></returns>
internal static object PreCallObjectTransform(IPhpObjectGraphNode node, ScriptContext context)
{
DObject obj = node as DObject;
if (obj != null && !obj.GetType().FullName.StartsWith(Namespaces.Library))
{
// simulate "marshal-by-ref" semantics for user-defined classes
stdClass std = new stdClass(context);
string id = Guid.NewGuid().ToString();
std.SetProperty(ObjectIdentityFieldName, id, null);
(objectIdentities ?? (objectIdentities = new Dictionary<string, DObject>()))[id] = obj;
return std;
}
if (node is PhpString)
return ((IPhpConvertible)node).ToString();
return node;
}
/// <summary>
/// Converts <see cref="stdClass"/>es with identity field present into their corresponding user-defined
/// class instances.
/// </summary>
/// <param name="node"></param>
/// <param name="context">Current <see cref="ScriptContext"/>.</param>
/// <returns></returns>
internal static object PostCallObjectTransform(IPhpObjectGraphNode node, ScriptContext context)
{
stdClass std = node as stdClass;
if (std != null && objectIdentities != null)
{
string id = PhpVariable.AsString(std.GetProperty(ObjectIdentityFieldName, null));
if (id != null)
{
DObject obj;
if (objectIdentities.TryGetValue(id, out obj)) return obj;
}
}
return node;
}
/// <summary>
/// Walks the object graph using specified callback function.
/// </summary>
/// <param name="context"></param>
/// <param name="callback"></param>
/// <param name="node">Object graph, can be null.</param>
public static void TransformParameterGraph(ScriptContext context, PhpWalkCallback callback, IPhpObjectGraphNode node)
{
if (node != null) node.Walk(callback, context);
}
