/// <summary>
/// Calls the native V8 proxy library to create a JavaScript array for use within the V8 JavaScript environment.
/// </summary>
public InternalHandle CreateArray(params InternalHandle[] items)
{
HandleProxy **nativeArrayMem = items.Length > 0 ? Utilities.MakeHandleProxyArray(items) : null;
InternalHandle handle = V8NetProxy.CreateArray(_NativeV8EngineProxy, nativeArrayMem, items.Length);
Utilities.FreeNativeMemory((IntPtr)nativeArrayMem);
return(handle);
}
/// <summary>
/// Allocates native memory to marshal an array of proxy handles.
/// Uses 'Utilities.AllocPointerArray()', so be sure to call 'Utilities.FreeNativeMemory()' when done.
/// </summary>
public static HandleProxy **MakeHandleProxyArray(InternalHandle[] items)
{
HandleProxy **nativeArrayMem = (HandleProxy **)Utilities.AllocPointerArray(items.Length);
for (var i = 0; i < items.Length; i++)
{
nativeArrayMem[i] = (HandleProxy *)items[i];
}
return(nativeArrayMem);
}
/// <summary>
/// Allocates native memory to marshal an array of proxy handles.
/// Uses 'Utilities.AllocPointerArray()', so be sure to call 'Utilities.FreeNativeMemory()' when done.
/// </summary>
public static HandleProxy **MakeHandleProxyArray(InternalHandle[] items)
{
// (Note: items may be NULL, which is equivalent to "undefined")
HandleProxy **nativeArrayMem = (HandleProxy **)Utilities.AllocPointerArray(items.Length);
for (var i = 0; i < items.Length; i++)
{
nativeArrayMem[i] = (HandleProxy *)items[i];
}
return(nativeArrayMem);
}
/// <summary>
/// Allocates native memory to marshal an array of proxy handles.
/// Uses 'Utilities.AllocPointerArray()', so be sure to call 'Utilities.FreeNativeMemory()' when done.
/// </summary>
public static HandleProxy **MakeHandleProxyArray <T>(T[] items) where T : INativeHandleBased
{
// (Note: items may be NULL, which is equivalent to "undefined")
HandleProxy **nativeArrayMem = (HandleProxy **)Utilities.AllocPointerArray(items.Length);
for (var i = 0; i < items.Length; i++)
{
nativeArrayMem[i] = items[i].GetNativeHandleProxy();
}
return(nativeArrayMem);
}
// --------------------------------------------------------------------------------------------------------------------
/// <summary>
/// Calls the underlying native function to create and return a new instance, which will be wrapped in the specified managed object type.
/// </summary>
/// <typeparam name="T">A managed object type to wrap the new native object handle.</typeparam>
/// <param name="args">Arguments to pass to the function to construct the new native instance.</param>
/// <returns>A new instance of 'T'.</returns>
public V8ManagedObject CreateInstance <T>(params InternalHandle[] args) // TODO: Parameter passing needs testing.
where T : V8ManagedObject, new()
{
HandleProxy **_args = null;
if (args.Length > 0)
{
_args = (HandleProxy **)Utilities.AllocPointerArray(args.Length);
for (var i = 0; i < args.Length; i++)
{
_args[i] = args[i];
}
}
// (note: the special case here is that the native function object will use its own template to create instances)
T obj = _Engine._CreateManagedObject <T>(this, null);
obj.Template = InstanceTemplate;
try
{
obj._Handle.Set(V8NetProxy.CreateInstanceFromFunctionTemplate(_NativeFunctionTemplateProxy, obj.ID, args.Length, _args));
// (note: setting '_NativeObject' also updates it's '_ManagedObject' field if necessary.
obj.Initialize(true, args);
}
catch (Exception ex)
{
// ... something went wrong, so remove the new managed object ...
_Engine._RemoveObjectWeakReference(obj.ID);
throw ex;
}
finally
{
Utilities.FreeNativeMemory((IntPtr)_args);
}
return(obj);
}
// --------------------------------------------------------------------------------------------------------------------
/// <summary>
/// Calls the underlying native function to create a new native object and return its handle.
/// Use this method if you only need the native object and not a managed wrapper.
/// </summary>
/// <param name="args">Arguments to pass to the function to construct the new native instance.</param>
/// <returns>A handle to the new object.</returns>
public InternalHandle CreateNativeInstance(params InternalHandle[] args) // TODO: Parameter passing needs testing.
{
HandleProxy **_args = null;
if (args.Length > 0)
{
_args = (HandleProxy **)Utilities.AllocPointerArray(args.Length);
for (var i = 0; i < args.Length; i++)
{
_args[i] = args[i];
}
}
try
{
return((InternalHandle)V8NetProxy.CreateInstanceFromFunctionTemplate(_NativeFunctionTemplateProxy, -1, args.Length, _args));
}
finally
{
Utilities.FreeNativeMemory((IntPtr)_args);
}
}
public static extern HandleProxy *CreateArray(NativeV8EngineProxy *engine, HandleProxy **items = null, Int32 length = 0);
public static unsafe extern HandleProxy *CreateFunctionInstance(NativeFunctionTemplateProxy *functionTemplateProxy, Int32 objID, Int32 argCount = 0, HandleProxy **args = null);
/// <summary> /// Calls a property with a given name on a specified object as a function and returns the result. /// If the function name is null, then the subject is assumed to be a function object. /// </summary> public static unsafe extern HandleProxy *Call(HandleProxy *subject, string functionName, HandleProxy *_this, Int32 argCount, HandleProxy **args);
// TODO: This is shared in both templates - consider putting elsewhere.
internal static HandleProxy *_CallBack(Int32 managedObjectID, bool isConstructCall, HandleProxy *_this, HandleProxy **args, Int32 argCount, params JSFunction[] functions)
{
// ... get a handle to the native "this" object ...
InternalHandle hThis = _this;
V8Engine engine = hThis.Engine;
// ... wrap the arguments ...
InternalHandle[] _args = new InternalHandle[argCount];
int i;
for (i = 0; i < argCount; i++)
{
_args[i] = args[i]; // (since these will be disposed immediately after, the "first" flag is not required [this also prevents it from getting passed on])
}
// (note: the underlying native handles for '_this' and any arguments will be disposed automatically upon return, unless the user calls 'KeepAlive()' on them)
InternalHandle result = null;
// ... call all function types (multiple custom derived function types are allowed, but only one of each type) ...
foreach (var callback in functions)
{
result = callback(engine, isConstructCall, hThis, _args);
if (!result.IsEmpty)
{
break;
}
}
var obj = result.Object;
// ... make sure the user is not returning a 'V8ManagedObject' instance associated with the new object (the property interceptors will never work) ...
if (isConstructCall && obj != null && obj is V8ManagedObject && obj.InternalHandle == hThis)
{
throw new InvalidOperationException("You've attempted to return the type '" + obj.GetType().Name
+ "' which is of type V8ManagedObject in a construction call (using 'new' in JavaScript) to wrap the new native object given to the constructor. The native V8 engine"
+ " only supports interceptor hooks for objects generated from ObjectTemplate instances. You will need to first derive/implement from V8NativeObject/IV8NativeObject"
+ " for your custom object(s), or rewrite your object to use V8NativeObject directly instead and use the 'SetAccessor()' handle method.");
}
return(result);
}
// --------------------------------------------------------------------------------------------------------------------
/// <summary>
/// This is the main entry point from the native side for all calls to functions created from function templates.
/// This method exists to give an instance based delegate reference for each function template instance.
/// </summary>
/// <param name="managedObjectID">The object ID of a managed object for this call.</param>
/// <param name="isConstructCall">'true' if this is called because of the 'new' operator in JS.</param>
/// <param name="_this">The instance context, if any.</param>
/// <param name="args">Any arguments from the JS call.</param>
/// <param name="argCount">Number of arguments given in the JS call.</param>
/// <returns></returns>
HandleProxy *_CallBack(Int32 managedObjectID, bool isConstructCall, HandleProxy *_this, HandleProxy **args, Int32 argCount)
{
lock (_FunctionsByType)
{
// ... get a list of callback functions to execute for this callback ...
var functions = from f in
(from t in _FunctionsByType.Keys.ToArray() // (need to convert this to an array in case the callbacks modify the dictionary!)
select _Engine._GetExistingObject(_FunctionsByType[t]))
where f != null && ((V8Function)f.Object).Callback != null
select((V8Function)f.Object).Callback;
return(_CallBack(managedObjectID, isConstructCall, _this, args, argCount, functions.ToArray()));
}
}
public static unsafe extern HandleProxy *CreateInstanceFromFunctionTemplate(NativeFunctionTemplateProxy *functionTemplateProxy, Int32 objID, Int32 argCount, HandleProxy **args);
internal static HandleProxy *_CallBack(Int32 managedObjectID, bool isConstructCall, HandleProxy *_this, HandleProxy **args, Int32 argCount, params JSFunction[] functions)
{
// ... get a handle to the native "this" object ...
using (InternalHandle hThis = new InternalHandle(_this, false))
{
V8Engine engine = hThis.Engine;
// ... wrap the arguments ...
InternalHandle[] _args = new InternalHandle[argCount];
int i;
for (i = 0; i < argCount; i++)
{
_args[i]._Set(args[i], false); // (since these will be disposed immediately after, the "first" flag is not required [this also prevents it from getting passed on])
}
InternalHandle result = null;
try
{
// ... call all function types (multiple custom derived function types are allowed, but only one of each type) ...
foreach (var callback in functions)
{
result = callback(engine, isConstructCall, hThis, _args);
if (!result.IsEmpty)
{
break;
}
}
}
finally
{
for (i = 0; i < _args.Length; i++)
{
if (_args[i] != result)
{
_args[i].Dispose();
}
}
}
if (isConstructCall && result.HasObject && result.Object is V8ManagedObject && result.Object.Handle._Handle == hThis)
{
throw new InvalidOperationException("You've attempted to return the type '" + result.Object.GetType().Name
+ "' which implements/extends IV8ManagedObject/V8ManagedObject in a construction call (using 'new' in JavaScript) to wrap the new native object."
+ " The native V8 engine only supports interceptor hooks for objects generated from ObjectTemplate instances. You will need to first derive/implement from V8NativeObject/IV8NativeObject"
+ " for construction calls, then wrap it around your object (or rewrite your object to use V8NativeObject directly instead and use the 'SetAccessor()' handle method).");
}
return(result);
}
}
// --------------------------------------------------------------------------------------------------------------------
HandleProxy *_CallBack(Int32 managedObjectID, bool isConstructCall, HandleProxy *_this, HandleProxy **args, Int32 argCount)
{
var functions = from f in
(from t in _FunctionsByType.Keys.ToArray() // (need to convert this to an array in case the callbacks modify the dictionary!)
select _Engine._GetObjectWeakReference(_FunctionsByType[t]))
where f != null && f.Object != null && ((V8Function)f.Object).Callback != null
select((V8Function)f.Object).Callback;
return(_CallBack(managedObjectID, isConstructCall, _this, args, argCount, functions.ToArray()));
}
