public PropertyDescriptor(PropertyDescriptor descriptor)
{
Get = descriptor.Get;
Set = descriptor.Set;
Value = descriptor.Value;
Enumerable = descriptor.Enumerable;
Configurable = descriptor.Configurable;
Writable = descriptor.Writable;
}
public override bool DefineOwnProperty(string propertyName, PropertyDescriptor desc, bool throwOnError)
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError, "Can't define a property of a NamespaceReference");
}
return false;
}
/// <summary>
/// Optimized version of [[Put]] when the property is known to be already declared
/// </summary>
/// <param name="name"></param>
/// <param name="value"></param>
public void FastSetProperty(string name, PropertyDescriptor value)
{
Properties[name] = value;
}
/// <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;
}
/// <summary>
/// Sets the specified named property to the value
/// of the second parameter. The flag controls
/// failure handling.
/// </summary>
/// <param name="propertyName"></param>
/// <param name="value"></param>
/// <param name="throwOnError"></param>
public virtual void Put(string propertyName, JsValue value, bool throwOnError)
{
if (!CanPut(propertyName))
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
return;
}
var ownDesc = GetOwnProperty(propertyName);
if (ownDesc.IsDataDescriptor())
{
var valueDesc = new PropertyDescriptor(value: value, writable: null, enumerable:null, configurable:null);
DefineOwnProperty(propertyName, valueDesc, throwOnError);
return;
}
// property is an accessor or inherited
var desc = GetProperty(propertyName);
if (desc.IsAccessorDescriptor())
{
var setter = desc.Set.Value.TryCast<ICallable>();
setter.Call(new JsValue(this), new [] {value});
}
else
{
var newDesc = new PropertyDescriptor(value, true, true, true);
DefineOwnProperty(propertyName, newDesc, throwOnError);
}
}
public static JsValue FromPropertyDescriptor(Engine engine, PropertyDescriptor desc)
{
if (desc == Undefined)
{
return Native.Undefined.Instance;
}
var obj = engine.Object.Construct(Arguments.Empty);
if (desc.IsDataDescriptor())
{
obj.DefineOwnProperty("value", new PropertyDescriptor(value: desc.Value.HasValue ? desc.Value.Value : Native.Undefined.Instance, writable: true, enumerable: true, configurable: true ), false);
obj.DefineOwnProperty("writable", new PropertyDescriptor(value: desc.Writable.HasValue && desc.Writable.Value.AsBoolean(), writable: true, enumerable: true, configurable: true), false);
}
else
{
obj.DefineOwnProperty("get", new PropertyDescriptor(desc.Get ?? Native.Undefined.Instance, writable: true, enumerable: true, configurable: true ), false);
obj.DefineOwnProperty("set", new PropertyDescriptor(desc.Set ?? Native.Undefined.Instance, writable: true, enumerable: true, configurable: true), false);
}
obj.DefineOwnProperty("enumerable", new PropertyDescriptor(value: desc.Enumerable.HasValue && desc.Enumerable.Value.AsBoolean(), writable: true, enumerable: true, configurable: true), false);
obj.DefineOwnProperty("configurable", new PropertyDescriptor(value: desc.Configurable.HasValue && desc.Configurable.Value.AsBoolean(), writable: true, enumerable: true, configurable: true), false);
return obj;
}
public static PropertyDescriptor ToPropertyDescriptor(Engine engine, JsValue o)
{
var obj = o.TryCast<ObjectInstance>();
if (obj == null)
{
throw new JavaScriptException(engine.TypeError);
}
if ((obj.HasProperty("value") || obj.HasProperty("writable")) &&
(obj.HasProperty("get") || obj.HasProperty("set")))
{
throw new JavaScriptException(engine.TypeError);
}
var desc = new PropertyDescriptor();
if (obj.HasProperty("enumerable"))
{
desc.Enumerable = TypeConverter.ToBoolean(obj.Get("enumerable"));
}
if (obj.HasProperty("configurable"))
{
desc.Configurable = TypeConverter.ToBoolean(obj.Get("configurable"));
}
if (obj.HasProperty("value"))
{
var value = obj.Get("value");
desc.Value = value;
}
if (obj.HasProperty("writable"))
{
desc.Writable = TypeConverter.ToBoolean(obj.Get("writable"));
}
if (obj.HasProperty("get"))
{
var getter = obj.Get("get");
if (getter != JsValue.Undefined && getter.TryCast<ICallable>() == null)
{
throw new JavaScriptException(engine.TypeError);
}
desc.Get = getter;
}
if (obj.HasProperty("set"))
{
var setter = obj.Get("set");
if (setter != Native.Undefined.Instance && setter.TryCast<ICallable>() == null)
{
throw new JavaScriptException(engine.TypeError);
}
desc.Set = setter;
}
if (desc.Get.HasValue || desc.Get.HasValue)
{
if (desc.Value.HasValue || desc.Writable.HasValue)
{
throw new JavaScriptException(engine.TypeError);
}
}
return desc;
}
public JsValue EvaluateObjectExpression(ObjectExpression objectExpression)
{
// http://www.ecma-international.org/ecma-262/5.1/#sec-11.1.5
var obj = _engine.Object.Construct(Arguments.Empty);
foreach (var property in objectExpression.Properties)
{
var propName = property.Key.GetKey();
var previous = obj.GetOwnProperty(propName);
PropertyDescriptor propDesc;
switch (property.Kind)
{
case PropertyKind.Data:
var exprValue = _engine.EvaluateExpression(property.Value);
var propValue = _engine.GetValue(exprValue);
propDesc = new PropertyDescriptor(propValue, true, true, true);
break;
case PropertyKind.Get:
var getter = property.Value as FunctionExpression;
if (getter == null)
{
throw new JavaScriptException(_engine.SyntaxError);
}
ScriptFunctionInstance get;
using (new StrictModeScope(getter.Strict))
{
get = new ScriptFunctionInstance(
_engine,
getter,
_engine.ExecutionContext.LexicalEnvironment,
StrictModeScope.IsStrictModeCode
);
}
propDesc = new PropertyDescriptor(get: get, set: null, enumerable: true, configurable:true);
break;
case PropertyKind.Set:
var setter = property.Value as FunctionExpression;
if (setter == null)
{
throw new JavaScriptException(_engine.SyntaxError);
}
ScriptFunctionInstance set;
using (new StrictModeScope(setter.Strict))
{
set = new ScriptFunctionInstance(
_engine,
setter,
_engine.ExecutionContext.LexicalEnvironment,
StrictModeScope.IsStrictModeCode
);
}
propDesc = new PropertyDescriptor(get:null, set: set, enumerable: true, configurable: true);
break;
default:
throw new ArgumentOutOfRangeException();
}
if (previous != PropertyDescriptor.Undefined)
{
if (StrictModeScope.IsStrictModeCode && previous.IsDataDescriptor() && propDesc.IsDataDescriptor())
{
throw new JavaScriptException(_engine.SyntaxError);
}
if (previous.IsDataDescriptor() && propDesc.IsAccessorDescriptor())
{
throw new JavaScriptException(_engine.SyntaxError);
}
if (previous.IsAccessorDescriptor() && propDesc.IsDataDescriptor())
{
throw new JavaScriptException(_engine.SyntaxError);
}
if (previous.IsAccessorDescriptor() && propDesc.IsAccessorDescriptor())
{
if (propDesc.Set.HasValue && previous.Set.HasValue)
{
throw new JavaScriptException(_engine.SyntaxError);
}
if (propDesc.Get.HasValue && previous.Get.HasValue)
{
throw new JavaScriptException(_engine.SyntaxError);
}
}
}
obj.DefineOwnProperty(propName, propDesc, false);
}
return obj;
}
public static PropertyDescriptor ToPropertyDescriptor(Engine engine, JsValue o)
{
var obj = o.TryCast <ObjectInstance>();
if (obj == null)
{
throw new JavaScriptException(engine.TypeError);
}
if ((obj.HasProperty("value") || obj.HasProperty("writable")) &&
(obj.HasProperty("get") || obj.HasProperty("set")))
{
throw new JavaScriptException(engine.TypeError);
}
var desc = new PropertyDescriptor();
if (obj.HasProperty("enumerable"))
{
desc.Enumerable = TypeConverter.ToBoolean(obj.Get("enumerable"));
}
if (obj.HasProperty("configurable"))
{
desc.Configurable = TypeConverter.ToBoolean(obj.Get("configurable"));
}
if (obj.HasProperty("value"))
{
var value = obj.Get("value");
desc.Value = value;
}
if (obj.HasProperty("writable"))
{
desc.Writable = TypeConverter.ToBoolean(obj.Get("writable"));
}
if (obj.HasProperty("get"))
{
var getter = obj.Get("get");
if (getter != JsValue.Undefined && getter.TryCast <ICallable>() == null)
{
throw new JavaScriptException(engine.TypeError);
}
desc.Get = getter;
}
if (obj.HasProperty("set"))
{
var setter = obj.Get("set");
if (setter != Native.Undefined.Instance && setter.TryCast <ICallable>() == null)
{
throw new JavaScriptException(engine.TypeError);
}
desc.Set = setter;
}
if (desc.Get.HasValue || desc.Get.HasValue)
{
if (desc.Value.HasValue || desc.Writable.HasValue)
{
throw new JavaScriptException(engine.TypeError);
}
}
return(desc);
}
public override bool DefineOwnProperty(string propertyName, PropertyDescriptor desc, bool throwOnError)
{
var oldLenDesc = GetOwnProperty("length");
var oldLen = TypeConverter.ToNumber(oldLenDesc.Value.Value);
if (propertyName == "length")
{
if (!desc.Value.HasValue)
{
return base.DefineOwnProperty("length", desc, throwOnError);
}
var newLenDesc = new PropertyDescriptor(desc);
uint newLen = TypeConverter.ToUint32(desc.Value.Value);
if (newLen != TypeConverter.ToNumber(desc.Value.Value))
{
throw new JavaScriptException(_engine.RangeError);
}
newLenDesc.Value = newLen;
if (newLen >= oldLen)
{
return base.DefineOwnProperty("length", newLenDesc, throwOnError);
}
if (!oldLenDesc.Writable.Value.AsBoolean())
{
if (throwOnError)
{
throw new JavaScriptException(_engine.TypeError);
}
return false;
}
bool newWritable;
if (!newLenDesc.Writable.HasValue || newLenDesc.Writable.Value.AsBoolean())
{
newWritable = true;
}
else
{
newWritable = false;
newLenDesc.Writable = true;
}
var succeeded = base.DefineOwnProperty("length", newLenDesc, throwOnError);
if (!succeeded)
{
return false;
}
// in the case of sparse arrays, treat each concrete element instead of
// iterating over all indexes
if (Properties.Count < oldLen - newLen)
{
var keys = Properties.Keys.ToArray();
foreach (var key in keys)
{
uint index;
// is it the index of the array
if (uint.TryParse(key, out index) && index >= newLen && index < oldLen)
{
var deleteSucceeded = Delete(key, false);
if (!deleteSucceeded)
{
newLenDesc.Value = new JsValue(index + 1);
if (!newWritable)
{
newLenDesc.Writable = JsValue.False;
}
base.DefineOwnProperty("length", newLenDesc, false);
if (throwOnError)
{
throw new JavaScriptException(_engine.TypeError);
}
return false;
}
}
}
}
else
{
while (newLen < oldLen)
{
// algorithm as per the spec
oldLen--;
var deleteSucceeded = Delete(TypeConverter.ToString(oldLen), false);
if (!deleteSucceeded)
{
newLenDesc.Value = oldLen + 1;
if (!newWritable)
{
newLenDesc.Writable = false;
}
base.DefineOwnProperty("length", newLenDesc, false);
if (throwOnError)
{
throw new JavaScriptException(_engine.TypeError);
}
return false;
}
}
}
if (!newWritable)
{
DefineOwnProperty("length", new PropertyDescriptor(value: null, writable: false, enumerable: null, configurable: null), false);
}
return true;
}
else if (IsArrayIndex(propertyName))
{
var index = TypeConverter.ToUint32(propertyName);
if (index >= oldLen && !oldLenDesc.Writable.Value.AsBoolean())
{
if (throwOnError)
{
throw new JavaScriptException(_engine.TypeError);
}
return false;
}
var succeeded = base.DefineOwnProperty(propertyName, desc, false);
if (!succeeded)
{
if (throwOnError)
{
throw new JavaScriptException(_engine.TypeError);
}
return false;
}
if (index >= oldLen)
{
oldLenDesc.Value = index + 1;
base.DefineOwnProperty("length", oldLenDesc, false);
}
return true;
}
return base.DefineOwnProperty(propertyName, desc, throwOnError);
}
public override bool DefineOwnProperty(string propertyName, PropertyDescriptor desc, bool throwOnError)
{
if (!Strict && ParameterMap != null)
{
var map = ParameterMap;
var isMapped = map.GetOwnProperty(propertyName);
var allowed = base.DefineOwnProperty(propertyName, desc, false);
if (!allowed)
{
if (throwOnError)
{
throw new JavaScriptException(Engine.TypeError);
}
}
if (isMapped != PropertyDescriptor.Undefined)
{
if (desc.IsAccessorDescriptor())
{
map.Delete(propertyName, false);
}
else
{
if (desc.Value.HasValue && desc.Value.Value != Undefined.Instance)
{
map.Put(propertyName, desc.Value.Value, throwOnError);
}
if (desc.Writable.HasValue && desc.Writable.Value == false)
{
map.Delete(propertyName, false);
}
}
}
return true;
}
return base.DefineOwnProperty(propertyName, desc, throwOnError);
}
