public override object CallLateBound(object thisObject, params object[] argumentValues)
{
var target = argumentValues.Length >= 1 ? argumentValues[0] : this.Engine.Object.Construct();
var source = argumentValues.Length >= 2 ? argumentValues[1] : null;
var deep = argumentValues.Length >= 3 && TypeConverter.ToBoolean(argumentValues[2]);
var resolve = argumentValues.Length >= 4 ? argumentValues[3] : true;
if (target == null || target == Null.Value || target == Undefined.Value)
{
target = this.Engine.Object.Construct();
}
if (TypeConverter.ToBoolean(target) && TypeUtilities.IsString(source) == false && source != null && source != Null.Value && source != Undefined.Value)
{
var sourceObj = TypeConverter.ToObject(this.Engine, source);
var targetObj = TypeConverter.ToObject(this.Engine, target);
foreach (var kvp in sourceObj.Properties)
{
if (!ObjectInstance.HasOwnProperty(this.Engine, source, kvp.Name) || !TypeConverter.ToBoolean(target))
{
continue;
}
var val = kvp.Value;
var goDeep = deep && JurassicHelper.IsObjectType(val);
//Conflict!
if (targetObj.HasProperty(kvp.Name) && targetObj[kvp.Name] != Undefined.Value && (target is ArrayInstance) == false)
{
//Do not merge.
if (TypeConverter.ToBoolean(resolve) == false && !goDeep)
{
continue;
}
//if the source value is null, and the target is null, don't set the value
//if this isn't here string properties will get set to string 'null'
var targetValue = targetObj[kvp.Name];
if ((targetValue == null || targetValue == Null.Value) && (val == null || val == Null.Value))
{
continue;
}
// Use the result of the callback as the result.
if (resolve is FunctionInstance)
{
val = (resolve as FunctionInstance).Call(source, kvp.Name, targetObj[kvp.Name], sourceObj[kvp.Name]);
//Hack to fix issue with a resolve function returning a double, when the source type is an int.
if (sourceObj[kvp.Name].GetType() != val.GetType())
{
val = TypeConverter.ConvertTo(this.Engine, val, sourceObj[kvp.Name].GetType());
}
}
else if (TypeConverter.ToBoolean(resolve))
{
val = kvp.Value;
}
}
// Deep merging.
if (goDeep)
{
if (val is DateInstance)
{
val = this.Engine.Date.Construct((val as DateInstance).GetTime());
}
else if (val is RegExpInstance)
{
val = this.Engine.RegExp.Construct((val as RegExpInstance).Source, (val as RegExpInstance).Flags);
}
else
{
if (!TypeConverter.ToBoolean(targetObj[kvp.Name]))
{
if (val is ArrayInstance)
{
targetObj[kvp.Name] = this.Engine.Array.Construct();
}
else
{
targetObj[kvp.Name] = this.Engine.Object.Construct();
}
}
CallLateBound(thisObject, targetObj[kvp.Name], sourceObj[kvp.Name], deep, resolve);
continue;
}
}
if (target is ArrayInstance && kvp.Name == "length")
{
continue;
}
targetObj.SetPropertyValue(kvp.Name, val, false);
}
target = targetObj;
}
return(target);
}