How to storage tokens and their line in object?

1

My file format like this:
[header1]
…
[header2]
…
I’ve made a mode to highlight headers, and give them class “cm-header”. I want to storage headers and their lines to object like this: {'header1": 10, “header2”: 20}, and I hope this object update when the text changed, the text file may very big. Is there an efficient way to deal with this problem?

2

You could write code that listens to "change" events and updates your data structure by re-scanning only the changed lines. CodeMirror itself doesn’t provide a framework for doing this (though it does expose the events and methods you need for it).

3

Thanks for your help, which is very useful. I did not notice this event parameters in the document, just though it like the normal “change” event of DOM.