/// <summary>
/// Creates or alters the named own property to
/// have the state described by a Property
/// Descriptor. The flag controls failure handling.
/// </summary>
/// <param name="propertyName"></param>
/// <param name="desc"></param>
/// <param name="throwOnError"></param>
/// <returns></returns>
public virtual bool DefineOwnProperty(string propertyName, PropertyDescriptor desc, bool throwOnError)
{
var current = GetOwnProperty(propertyName);
if (current == desc) {
return true;
}
if (current == PropertyDescriptor.Undefined)
{
if (!Extensible)
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return false;
}
else
{
if (desc.IsGenericDescriptor() || desc.IsDataDescriptor())
{
SetOwnProperty(propertyName, new PropertyDescriptor(desc)
{
Value = desc.Value.HasValue ? desc.Value : JsValue.Undefined,
Writable = desc.Writable.HasValue ? desc.Writable.Value : false,
Enumerable = desc.Enumerable.HasValue ? desc.Enumerable.Value : false,
Configurable = desc.Configurable.HasValue ? desc.Configurable.Value : false
});
}
else
{
SetOwnProperty(propertyName, new PropertyDescriptor(desc)
{
Get = desc.Get,
Set = desc.Set,
Enumerable = desc.Enumerable.HasValue ? desc.Enumerable : false,
Configurable = desc.Configurable.HasValue ? desc.Configurable : false,
});
}
}
return true;
}
// Step 5
if (!current.Configurable.HasValue &&
!current.Enumerable.HasValue &&
!current.Writable.HasValue &&
!current.Get.HasValue &&
!current.Set.HasValue &&
!current.Value.HasValue)
{
return true;
}
// Step 6
if (
current.Configurable == desc.Configurable &&
current.Writable == desc.Writable &&
current.Enumerable == desc.Enumerable &&
((!current.Get.HasValue && !desc.Get.HasValue) || (current.Get.HasValue && desc.Get.HasValue && ExpressionInterpreter.SameValue(current.Get.Value, desc.Get.Value))) &&
((!current.Set.HasValue && !desc.Set.HasValue) || (current.Set.HasValue && desc.Set.HasValue && ExpressionInterpreter.SameValue(current.Set.Value, desc.Set.Value))) &&
((!current.Value.HasValue && !desc.Value.HasValue) || (current.Value.HasValue && desc.Value.HasValue && ExpressionInterpreter.StrictlyEqual(current.Value.Value, desc.Value.Value)))
) {
return true;
}
if (!current.Configurable.HasValue || !current.Configurable.Value)
{
if (desc.Configurable.HasValue && desc.Configurable.Value)
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return false;
}
if (desc.Enumerable.HasValue && (!current.Enumerable.HasValue || desc.Enumerable.Value != current.Enumerable.Value))
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return false;
}
}
if (!desc.IsGenericDescriptor())
{
if (current.IsDataDescriptor() != desc.IsDataDescriptor())
{
if (!current.Configurable.HasValue || !current.Configurable.Value)
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return false;
}
if (current.IsDataDescriptor())
{
SetOwnProperty(propertyName, current = new PropertyDescriptor(
get: Undefined.Instance,
set: Undefined.Instance,
enumerable: current.Enumerable,
configurable: current.Configurable
));
}
else
{
SetOwnProperty(propertyName, current = new PropertyDescriptor(
value: Undefined.Instance,
writable: null,
enumerable: current.Enumerable,
configurable: current.Configurable
));
}
}
else if (current.IsDataDescriptor() && desc.IsDataDescriptor())
{
if (!current.Configurable.HasValue || current.Configurable.Value == false)
{
if (!current.Writable.HasValue || !current.Writable.Value && desc.Writable.HasValue && desc.Writable.Value)
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return false;
}
if (!current.Writable.Value)
{
if (desc.Value.HasValue && !ExpressionInterpreter.SameValue(desc.Value.Value, current.Value.Value))
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return false;
}
}
}
}
else if (current.IsAccessorDescriptor() && desc.IsAccessorDescriptor())
{
if (!current.Configurable.HasValue || !current.Configurable.Value)
{
if ((desc.Set.HasValue && !ExpressionInterpreter.SameValue(desc.Set.Value, current.Set.HasValue ? current.Set.Value : Undefined.Instance))
||
(desc.Get.HasValue && !ExpressionInterpreter.SameValue(desc.Get.Value, current.Get.HasValue ? current.Get.Value : Undefined.Instance)))
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return false;
}
}
}
}
if (desc.Value.HasValue)
{
current.Value = desc.Value;
}
if (desc.Writable.HasValue)
{
current.Writable = desc.Writable;
}
if (desc.Enumerable.HasValue)
{
current.Enumerable = desc.Enumerable;
}
if (desc.Configurable.HasValue)
{
current.Configurable = desc.Configurable;
}
if (desc.Get.HasValue)
{
current.Get = desc.Get;
}
if (desc.Set.HasValue)
{
current.Set = desc.Set;
}
return true;
}
/// <summary>
/// Creates or alters the named own property to
/// have the state described by a Property
/// Descriptor. The flag controls failure handling.
/// </summary>
/// <param name="propertyName"></param>
/// <param name="desc"></param>
/// <param name="throwOnError"></param>
/// <returns></returns>
public virtual bool DefineOwnProperty(string propertyName, PropertyDescriptor desc, bool throwOnError)
{
var current = GetOwnProperty(propertyName);
if (current == PropertyDescriptor.Undefined)
{
if (!Extensible)
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return false;
}
else
{
if (desc.IsGenericDescriptor() || desc.IsDataDescriptor())
{
Properties[propertyName] = new PropertyDescriptor(desc)
{
Value = desc.Value.HasValue ? desc.Value : JsValue.Undefined,
Writable = desc.Writable.HasValue ? desc.Writable : false
};
}
else
{
Properties[propertyName] = new PropertyDescriptor(desc)
{
Enumerable = desc.Enumerable.HasValue ? desc.Enumerable : false,
Configurable = desc.Configurable.HasValue ? desc.Configurable : false,
};
}
}
return true;
}
// Step 5
if (!current.Configurable.HasValue &&
!current.Enumerable.HasValue &&
!current.Writable.HasValue &&
!current.Get.HasValue &&
!current.Set.HasValue &&
!current.Value.HasValue)
{
return true;
}
// Step 6
var configurableIsSame = current.Configurable.HasValue
? desc.Configurable.HasValue && (current.Configurable.Value == desc.Configurable.Value)
: !desc.Configurable.HasValue;
var enumerableIsSame = current.Enumerable.HasValue
? desc.Enumerable.HasValue && (current.Enumerable.Value == desc.Enumerable.Value)
: !desc.Enumerable.HasValue;
var writableIsSame = true;
var valueIsSame = true;
if (current.IsDataDescriptor() && desc.IsDataDescriptor())
{
var currentDataDescriptor = current;
var descDataDescriptor = desc;
writableIsSame = currentDataDescriptor.Writable.HasValue
? descDataDescriptor.Writable.HasValue && (currentDataDescriptor.Writable.Value == descDataDescriptor.Writable.Value)
: !descDataDescriptor.Writable.HasValue;
var valueA = currentDataDescriptor.Value.HasValue
? currentDataDescriptor.Value.Value
: Undefined.Instance;
var valueB = descDataDescriptor.Value.HasValue
? descDataDescriptor.Value.Value
: Undefined.Instance;
valueIsSame = ExpressionInterpreter.SameValue(valueA, valueB);
}
else if (current.IsAccessorDescriptor() && desc.IsAccessorDescriptor())
{
var currentAccessorDescriptor = current;
var descAccessorDescriptor = desc;
var getValueA = currentAccessorDescriptor.Get.HasValue
? currentAccessorDescriptor.Get.Value
: Undefined.Instance;
var getValueB = descAccessorDescriptor.Get.HasValue
? descAccessorDescriptor.Get.Value
: Undefined.Instance;
var setValueA = currentAccessorDescriptor.Set.HasValue
? currentAccessorDescriptor.Set.Value
: Undefined.Instance;
var setValueB = descAccessorDescriptor.Set.HasValue
? descAccessorDescriptor.Set.Value
: Undefined.Instance;
valueIsSame = ExpressionInterpreter.SameValue(getValueA, getValueB)
&& ExpressionInterpreter.SameValue(setValueA, setValueB);
}
else
{
valueIsSame = false;
}
if (configurableIsSame && enumerableIsSame && writableIsSame && valueIsSame)
{
return true;
}
if (!current.Configurable.HasValue || !current.Configurable.Value.AsBoolean())
{
if (desc.Configurable.HasValue && desc.Configurable.Value.AsBoolean())
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return false;
}
if (desc.Enumerable.HasValue && (!current.Enumerable.HasValue || desc.Enumerable.Value != current.Enumerable.Value))
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return false;
}
}
if (!desc.IsGenericDescriptor())
{
if (current.IsDataDescriptor() != desc.IsDataDescriptor())
{
if (!current.Configurable.HasValue || !current.Configurable.Value.AsBoolean())
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return false;
}
if (current.IsDataDescriptor())
{
Properties[propertyName] = current = new PropertyDescriptor(
get: Undefined.Instance,
set: Undefined.Instance,
enumerable: current.Enumerable.HasValue && current.Enumerable.Value.AsBoolean(),
configurable: current.Configurable.HasValue && current.Configurable.Value.AsBoolean()
);
}
else
{
Properties[propertyName] = current = new PropertyDescriptor(
value: Undefined.Instance,
writable: null,
enumerable: current.Enumerable.HasValue && current.Enumerable.Value.AsBoolean(),
configurable: current.Configurable.HasValue && current.Configurable.Value.AsBoolean()
);
}
}
else if (current.IsDataDescriptor() && desc.IsDataDescriptor())
{
if (!current.Configurable.HasValue || current.Configurable.Value.AsBoolean() == false)
{
if (!current.Writable.HasValue || !current.Writable.Value.AsBoolean() && desc.Writable.HasValue && desc.Writable.Value.AsBoolean())
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return false;
}
if (!current.Writable.Value.AsBoolean())
{
if (desc.Value.HasValue && !valueIsSame)
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return false;
}
}
}
}
else if (current.IsAccessorDescriptor() && desc.IsAccessorDescriptor())
{
if (!current.Configurable.HasValue || !current.Configurable.Value.AsBoolean())
{
if ((desc.Set.HasValue && !ExpressionInterpreter.SameValue(desc.Set.Value, current.Set.HasValue ? current.Set.Value : Undefined.Instance))
||
(desc.Get.HasValue && !ExpressionInterpreter.SameValue(desc.Get.Value, current.Get.HasValue ? current.Get.Value : Undefined.Instance)))
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return false;
}
}
}
}
if (desc.Value.HasValue)
{
current.Value = desc.Value;
}
if (desc.Writable.HasValue)
{
current.Writable = desc.Writable;
}
if (desc.Enumerable.HasValue)
{
current.Enumerable = desc.Enumerable;
}
if (desc.Configurable.HasValue)
{
current.Configurable = desc.Configurable;
}
if (desc.Get.HasValue)
{
current.Get = desc.Get;
}
if (desc.Set.HasValue)
{
current.Set = desc.Set;
}
return true;
}