How can I get Position from Document before the change?

v6
1

I want to get change’s range by Position (row & column) like v5 to integrate tree-sitter.
Migration guide and similar topic asked before says I can easily calculate Position value with doc.lineAt, but that doesn’t works when I try to get Position from document before the change.

I get error like: Invalid position 12 in document of length 11 every time when I delete some texts.

Are there any way to get last document’s change range?

2

If you have the transaction, its changes property gives you precisely this. If you don’t, then no, there’s no concept of a ‘last document’.

3

Thank you for your fast help, that worked.
Now what I’m curious is: are there cases when transaction is empty?
Is accessing ViewUpdate.transactions[0].startState.doc on EditorView.updateListener.of() stable enough than simply migrating to v5?

4

Yes, ViewUpdate.transactions may be empty. It may also hold more than one transaction. So loop over them or use ViewUpdate.changes, which combines them into a single changeset.