Is there a way to handle multi-lines instead of processing them line by line when pasting mult-lines?

[lvjinyu]

For example, when I type or pasteselect host() \n, I hope to handle it directly when encounter\n, but when I directly paste the text select\nhost()\n, I hope to not handle it directly when encounter the first \n and wait for the input of host() before processing.
In summary, it is to determine whether there is any unread content after \n. If not, it will be processed directly. Otherwise, continue reading

something like the following

[aep]

i tried to fix this but its pretty hard. i think the way this usually works is via timing. i.e. if there's a \n , you'd check if the next character came in too fast to be a human typing. this is weird and i hate it