How to write vim script to continuously move to the next window until window has a specific filetype in vim?

for example I have multiple windows in a vim instance:

+---+---+---+|   |   |   || A |   |   ||   |   |   |+---+---+---+

Different window has different filetypes, some are plugins (NvimTree/undotree/vista), others are real editing buffer (c/c++/python/etc).

I want to define key mappings, that will run command after auto jump to the real editing buffer window. And don't run directly on plugins window(NvimTree/undotree/vista).

Currently my key mappings are:

nnoremap <silent> <expr> <Leader>1 (&filetype ==# "NvimTree" <Bar><Bar> &filetype ==# "undotree" ? "\<C-w>\<C-w>" : "").":\<C-u>BufferGoto 1\<CR>"

This key mapping could work if current window's filetype is "NvimTree" or "undotree". But it's only jump once.I want to make it a while/for loop, continue jump if the filetypes are in a blacklist (NvimTree/undotree/vista), until it's a real editing buffer window (filetypes are c/cpp/python/etc).

How could I write this vim script?