Jump to semantic placeholders in vim

vim script

function! Generate_placeholder_pattern()
    return '<#\%(T##\)\?\%([^#]\+##\)\?\([^#]\+\)#>'
endfunction

function! Jump_to_placeholder()
    if &filetype !=# 'swift'
        return ''
    end

    if !Check_placeholder_existence()
        return ''
    endif

    :call Begin_replacing_placeholder()
endfunction


function! Begin_replacing_placeholder()
    echom "replace"
    "if mode() !=# 'n'
    "    return
    "endif

    let l:pattern = Generate_placeholder_pattern()

    let [l:line, l:column] = searchpos(l:pattern)
    if l:line == 0 && l:column == 0
        return
    end

    execute printf(':%d s/%s//', l:line, l:pattern)

    call cursor(l:line, l:column)
    "startinsert
endfunction

function! Check_placeholder_existence()
    return search(Generate_placeholder_pattern())
endfunction
:nmap <C-k> :call Jump_to_placeholder() <CR>