question: is incremental parsing possible?

I have the use case where I need to parse a text line by line. At the first line, the parser can start at its start position. At the end of the line, the parser should store its state (e.g. in which context is is) in a hashable object. When parsing any line that is not the first line, the state of the end of the previous line is restored and the current line is parsed.

(This is how QSyntaxHighlighter (from Qt) is organized. When the user types in a certain line, that line is re-highlighted. And when its state at the end is different than it was beforehand, the next line is also re-highlighted, and so on.)

Would this be possible using the lark parser? From my own experimentation and docs reading I can only parse a full text (or file) in one go.

Start by reviewing how the Lark parser currently handles the start position and full-text or full-file parsing. Compare that behavior with the requested line-by-line state restoration used by QSyntaxHighlighter. Done means establishing whether incremental parsing is feasible and documenting the required scope or limitations.