|
static private CreateRawObject ( |
||
| prototype | The next object in the prototype chain. | |
| return | ||
/// <summary>
/// Creates the array iterator prototype object.
/// </summary>
/// <param name="engine"> The script environment. </param>
internal static ObjectInstance CreatePrototype(ScriptEngine engine)
{
var result = ObjectInstance.CreateRawObject(engine.BaseIteratorPrototype);
var properties = GetDeclarativeProperties(engine);
result.FastSetProperties(properties);
return(result);
}
/// <summary>
/// Creates an object, using this function as the constructor.
/// </summary>
/// <param name="argumentValues"> An array of argument values. </param>
/// <returns> The object that was created. </returns>
public virtual ObjectInstance ConstructLateBound(params object[] argumentValues)
{
// Create a new object and set the prototype to the instance prototype of the function.
var newObject = ObjectInstance.CreateRawObject(this.InstancePrototype);
// Run the function, with the new object as the "this" keyword.
var result = CallLateBound(newObject, argumentValues);
// Return the result of the function if it is an object.
if (result is ObjectInstance)
{
return((ObjectInstance)result);
}
// Otherwise, return the new object.
return(newObject);
}
public static ObjectInstance Create(ScriptEngine engine, object prototype, [DefaultParameterValue(null)] ObjectInstance properties = null)
{
if ((prototype is ObjectInstance) == false && prototype != Null.Value)
{
throw new JavaScriptException(engine, "TypeError", "object prototype must be an object or null");
}
ObjectInstance result;
if (prototype == Null.Value)
{
result = ObjectInstance.CreateRootObject(engine);
}
else
{
result = ObjectInstance.CreateRawObject((ObjectInstance)prototype);
}
if (properties != null)
{
DefineProperties(result, properties);
}
return(result);
}
/// <summary>
/// Creates an object, using this function as the constructor.
/// </summary>
/// <param name="newTarget"> The value of 'new.target'. </param>
/// <param name="argumentValues"> An array of argument values. </param>
/// <returns> The object that was created. </returns>
public override ObjectInstance ConstructLateBound(FunctionInstance newTarget, params object[] argumentValues)
{
// Create a new object and set the prototype to the instance prototype of the function.
var newObject = ObjectInstance.CreateRawObject(newTarget.InstancePrototype);
// Run the function, with the new object as the "this" keyword.
var context = ExecutionContext.CreateConstructContext(
engine: this.Engine,
parentScope: this.ParentScope,
thisValue: newObject,
executingFunction: this,
newTarget: newTarget,
functionContainer: null);
var result = this.body(context, argumentValues);
// Return the result of the function if it is an object.
if (result is ObjectInstance)
{
return((ObjectInstance)result);
}
// Otherwise, return the new object.
return(newObject);
}
public ObjectInstance Construct()
{
return(ObjectInstance.CreateRawObject(this.InstancePrototype));
}
/// <summary>
/// Creates an object, using this function as the constructor.
/// </summary>
/// <param name="newTarget"> The value of 'new.target'. </param>
/// <param name="argumentValues"> An array of argument values. </param>
/// <returns> The object that was created. </returns>
public override ObjectInstance ConstructLateBound(FunctionInstance newTarget, params object[] argumentValues)
{
if (this.constructor != null)
{
// This class has a constructor.
ExecutionContext context;
if (Prototype != null && Prototype != Engine.Function.InstancePrototype)
{
// This class extends another. In that case 'this' is unavailable.
context = ExecutionContext.CreateDerivedContext(
engine: this.Engine,
parentScope: this.constructor.ParentScope,
executingFunction: this.constructor,
newTarget: newTarget,
functionContainer: this);
}
else
{
// This class doesn't extend from another class. Create a new object and set
// 'this' equal to the newly created object.
context = ExecutionContext.CreateConstructContext(
engine: this.Engine,
parentScope: this.constructor.ParentScope,
thisValue: ObjectInstance.CreateRawObject(newTarget.InstancePrototype),
executingFunction: this.constructor,
newTarget: newTarget,
functionContainer: this);
}
// Call the function.
var result = this.constructor.Body(context, argumentValues);
// If the constructor returned an object, use that, otherwise use the 'this' value.
if (result is ObjectInstance resultObject)
{
return(resultObject);
}
// Make sure super() was called in derived classes.
if (context.ThisBindingStatus == ExecutionContext.BindingStatus.Uninitialized)
{
throw new JavaScriptException(ErrorType.ReferenceError, "Must call super constructor in derived class before returning.");
}
return((ObjectInstance)context.ThisValue); // Must be ObjectInstance since it is only set in ExecutionContext.CallSuperClass().
}
else if (Prototype != Engine.Function.InstancePrototype)
{
// Call the base class constructor.
if (Prototype is FunctionInstance super)
{
return(super.ConstructLateBound(newTarget, argumentValues));
}
else
{
throw new JavaScriptException(ErrorType.TypeError, $"Super constructor {Prototype} of {Name} is not a constructor.");
}
}
else
{
// There's no constructor and no base class.
return(ObjectInstance.CreateRawObject(newTarget.InstancePrototype));
}
}
