ckeditor dataDowncast - I can not use both markerToData and markerToHighlight at the same time

Question

I have a ckeditor5 custom plugin and I have to convert markers to data for saving into the database.

This is the model: X[Y]Z

The marker name is "my-highlight:1"

This is what I would like to have:

X<my-highlight-start name="1"></my-highlight-start><span class="my-highlight">Y</span><my-highlight-end name="1"></mű-highlight-end>Z

So I need both start/end tags at the beginning and at the end of the marker range and also spans around the text nodes.

What I can do:

X<my-highlight-start name="1"></my-highlight-start>Y<my-highlight-end name="1"></my-highlight-end>Z

or

X<span class="my-highlight">Y</span><Z

But not both at the same time.

I need spans because I have to highlight the text in browsers and I need start/end tags because highlights can be overlapped and user can add remarks for the highlights.

So my output after processing will be like this:

X⁽¹⁾Y⁽¹⁾Z

1. User remark for Y

For overlapping cases:

X⁽¹⁾⁽²⁾AB⁽²⁾C⁽³⁾D⁽¹⁾Z⁽³⁾

1. User remark for ABCD
2. User remark for AB
3. User remark for DZ

Here is a part of my plugin configuration:

editor.conversion.for('dataDowncast')
    .markerToHighlight(data_markerToHighlightConfig)
    .markerToData(data_markerToDataConfig);

Seems to me that both can not work like this. Here only markerToData works. If I add only one of them that works, so my configuration for markerToHighlight and markerToData can be OK. I debugged, and when I add both, only markerToData called.

Here are the configs:

const data_markerToDataConfig = {
    model: "my-highlight"
};

const data_markerToHighlightConfig = {
    model: "my-highlight",
    view: { classes: "my-highlight" }
};

In action on-line: https://peterborkuti.github.io/ckeditor-bphighlight/

In action, see the console for the getData():

When both converters are enabled, only star/end markers are there (BAD)

When only markerToHighlight is enabled, only spans are there (OK)

When only markerToData is enabled, only start/end markers are there (OK)

Thank you in advance

Answer 1

I got the answer from ckeditor support. I am not sure, if I can share the original answer publicly, but the cause is:

markerToData and markerToHighlight can not be used together by design. This information is missing from the documentation. To deal with the situation, a custom converter should be written.

When I am done with the custom converter, I will share it here.