private ResolvedTagPropertyInfo ResolvePropertyInfo(TagIndexEntry tagInfo, string propertyPath)
{
var topTagType = TagFactory.GetTypeForTag(tagInfo.Tag);
var steps = PropertyAccessorParser.ExtractProperties(propertyPath);
var offset = 0;
var stepType = topTagType;
foreach (var step in steps)
{
var prop = stepType.GetProperty(step.PropertyName);
if (prop == null)
{
throw new Exception($"Couldn't find property '{step.PropertyName}' on type '{stepType}'");
}
if (step.AccessType == PropertyAccessorParser.PropertyAccessType.Normal)
{
offset += BlamSerializer.StartsAt(stepType, step.PropertyName);
stepType = prop.PropertyType;
}
else if (step.AccessType == PropertyAccessorParser.PropertyAccessType.ElementAccess)
{
if (prop.PropertyType.IsArray == false || step.ElementArgument is not int)
{
throw new NotSupportedException("Only arrays are currently supported for element access");
}
var elementSize = BlamSerializer.SizeOf(prop.PropertyType.GetElementType());
var elementOffset = (elementSize * ((int)step.ElementArgument));
if (prop.GetCustomAttribute <ReferenceArrayAttribute>() != null)
{
var startsAt = BlamSerializer.StartsAt(stepType, step.PropertyName);
// Read element array base offset
var baseOffset = new SecondaryOffset(this.originalMap, this.mapToPatch.ReadInt32At(tagInfo.Offset.Value + offset + startsAt + 4));
// baseOffset is the absolute offset, need to subtract tag offset and prior property offsets to get relative
offset += baseOffset.Value - tagInfo.Offset.Value - offset + elementOffset;
}
else if (prop.GetCustomAttribute <PrimitiveArrayAttribute>() != null)
{
offset += elementOffset;
}
else
{
throw new Exception("Only primitive and reference arrays are supported");
}
stepType = prop.PropertyType.GetElementType();
}
}
return(new ResolvedTagPropertyInfo()
{
RelativeOffset = offset,
PropertyType = stepType
});
}
