let s:ftplugins = {}
let s:default_plugin = {}

let s:vim_plugin = {}
function! s:vim_plugin.Before(file)
endfunction
function! s:vim_plugin.TagLine(linenr, line)
  return a:line =~ '\<\(if\|function\|return\|end\w*\|while\|for\|let\|else\|try\)\>'
endfunction

let s:java_plugin = {}

function! s:java_plugin.Before(file) dict
  let self.last_line = ''
endfunction

let s:WHITESPACE_OR_COMMENT='\(^\s*$\)\|\(^\s*//\)\|\(^\s*\*/\)'
function! s:java_plugin.TagLine(linenr, line) dict
  if self.last_line =~ s:WHITESPACE_OR_COMMENT
        \ && !(a:line =~ s:WHITESPACE_OR_COMMENT)
    let self.last_line = a:line
    return v:true
  endif
  let self.last_line = a:line

  return 
        \ a:line =~ '^\s*}$' ||
        \ a:line =~ '\<\(public\|private\|protected\|class\|static\|try\|while\|for\|if\|else\|catch\)\>'
endfunction

function! hints#plugins#registerFt(filetype, plugin) abort
  let s:ftplugins[a:filetype] = a:plugin
endfunction

function! hints#plugins#getPluginForFiletype(filetype) abort
  return get(s:ftplugins, a:filetype, s:default_plugin)
endfunction

function! hints#plugins#getDefaultPlugin() abort
  return s:default_plugin
endfunction

function! s:default_plugin.Before(file)
  let self.last_kind = 1
endfunction

let s:ISSPACE = '^\s*$'
let s:ISCOMMENT = '^\s*#'
function! s:default_plugin.TagLine(linenr, line)
  if a:line =~ s:ISSPACE
    let kind = 1
  elseif a:line =~ s:ISCOMMENT
    let kind = 2
  else
    let kind = 3
  endif

  if self.last_kind != kind && kind != 1
    let self.last_kind = kind
    return v:true
  endif

  let self.last_kind = kind
  return v:false
endfunction

call hints#plugins#registerFt("vim", s:vim_plugin)
call hints#plugins#registerFt("java", s:java_plugin)