" Private Functions {{{1
function! s:SetBufferOptDefault(opt, val) "{{{2
  if !exists('b:' . a:opt)
    let b:{a:opt} = a:val
  endif
endfunction

function! s:Map(map, to, mode) "{{{2
  if !empty(a:to) && !hasmapto(a:map, a:mode)
    for l:mode in split(a:mode, '.\zs')
      execute l:mode . 'map <buffer>' a:to a:map
    endfor
  endif
endfunction

function! s:UnMap(map, mode) "{{{2
  if !empty(maparg(a:map, a:mode))
    for mode in split(a:mode, '.\zs')
      execute l:mode . 'unmap <buffer>' a:map
    endfor
  endif
endfunction

function! s:ToggleMapping() "{{{2
  let separator_map = g:table_mode_separator
  " '|' is a special character, we need to map <Bar> instead
  if g:table_mode_separator ==# '|' | let separator_map = '<Bar>' | endif

  if !g:table_mode_disable_mappings
    if tablemode#IsActive()
      call s:Map('<Plug>(table-mode-tableize)', separator_map, 'i')
      call s:Map('<Plug>(table-mode-motion-up)', g:table_mode_motion_up_map, 'n')
      call s:Map('<Plug>(table-mode-motion-down)', g:table_mode_motion_down_map, 'n')
      call s:Map('<Plug>(table-mode-motion-left)', g:table_mode_motion_left_map, 'n')
      call s:Map('<Plug>(table-mode-motion-right)', g:table_mode_motion_right_map, 'n')

      call s:Map('<Plug>(table-mode-cell-text-object-a)', g:table_mode_cell_text_object_a_map, 'ox')
      call s:Map('<Plug>(table-mode-cell-text-object-i)', g:table_mode_cell_text_object_i_map, 'ox')

      call s:Map('<Plug>(table-mode-realign)', g:table_mode_realign_map, 'n')
      call s:Map('<Plug>(table-mode-delete-row)', g:table_mode_delete_row_map, 'n')
      call s:Map('<Plug>(table-mode-delete-column)', g:table_mode_delete_column_map, 'n')
      call s:Map('<Plug>(table-mode-add-formula)', g:table_mode_add_formula_map, 'n')
      call s:Map('<Plug>(table-mode-eval-formula)', g:table_mode_eval_formula_map, 'n')
      call s:Map('<Plug>(table-mode-echo-cell)', g:table_mode_echo_cell_map, 'n')
      call s:Map('<Plug>(table-mode-sort)', g:table_mode_sort_map, 'n')
    else
      call s:UnMap(separator_map, 'i')
      call s:UnMap(g:table_mode_motion_up_map, 'n')
      call s:UnMap(g:table_mode_motion_down_map, 'n')
      call s:UnMap(g:table_mode_motion_left_map, 'n')
      call s:UnMap(g:table_mode_motion_right_map, 'n')

      call s:UnMap(g:table_mode_cell_text_object_a_map, 'ox')
      call s:UnMap(g:table_mode_cell_text_object_i_map, 'ox')

      call s:UnMap(g:table_mode_realign_map, 'n')
      call s:UnMap(g:table_mode_delete_row_map, 'n')
      call s:UnMap(g:table_mode_delete_column_map, 'n')
      call s:UnMap(g:table_mode_add_formula_map, 'n')
      call s:UnMap(g:table_mode_eval_formula_map, 'n')
      call s:UnMap(g:table_mode_echo_cell_map, 'n')
      call s:UnMap(g:table_mode_sort_map, 'n')
    endif
  endif
endfunction

function! tablemode#SyntaxEnable()
  exec 'syntax match Table'
        \ '/' . tablemode#table#StartExpr() . '\zs|.\+|\ze' . tablemode#table#EndExpr() . '/'
        \ 'contains=TableBorder,TableSeparator,TableColumnAlign containedin=ALL'
  syntax match TableSeparator /|/ contained
  syntax match TableColumnAlign /:/ contained
  syntax match TableBorder /[\-+]\+/ contained

  hi! link TableBorder Delimiter
  hi! link TableSeparator Delimiter
  hi! link TableColumnAlign Type
endfunction

function! s:ToggleSyntax()
  if tablemode#IsActive()
    call tablemode#SyntaxEnable()
  else
    syntax clear Table
    syntax clear TableBorder
    syntax clear TableSeparator
    syntax clear TableColumnAlign

    hi! link TableBorder NONE
    hi! link TableSeparator NONE
    hi! link TableColumnAlign NONE
  endif
endfunction

function! s:SetActive(bool) "{{{2
  let b:table_mode_active = a:bool
  call s:ToggleSyntax()
  call s:ToggleMapping()
  if tablemode#IsActive()
    doautocmd User TableModeEnabled
  else
    doautocmd User TableModeDisabled
  endif
endfunction

function! s:ConvertDelimiterToSeparator(line, ...) "{{{2
  let old_gdefault = &gdefault
  set nogdefault

  let delim = g:table_mode_delimiter
  if a:0 | let delim = a:1 | endif
  if delim ==# ','
    silent! execute a:line . 's/' . "[\'\"][^\'\"]*\\zs,\\ze[^\'\"]*[\'\"]/__COMMA__/g"
  endif

  let [cstart, cend] = [tablemode#table#GetCommentStart(), tablemode#table#GetCommentEnd()]
  let [match_char_start, match_char_end] = ['.', '.']
  if tablemode#utils#strlen(cend) > 0 | let match_char_end = '[^' . cend . ']' | endif
  if tablemode#utils#strlen(cstart) > 0 | let match_char_start = '[^' . cstart . ']' | endif

  silent! execute a:line . 's/' . tablemode#table#StartExpr() . '\zs\ze' . match_char_start .
        \ '\|' . delim .  '\|' . match_char_end . '\zs\ze' . tablemode#table#EndExpr() . '/' .
        \ g:table_mode_separator . '/g'

  if delim ==# ','
    silent! execute a:line . 's/' . "[\'\"][^\'\"]*\\zs__COMMA__\\ze[^\'\"]*[\'\"]/,/g"
  endif

  let &gdefault=old_gdefault
endfunction

function! s:Tableizeline(line, ...) "{{{2
  let delim = g:table_mode_delimiter
  if a:0 && type(a:1) == type('') && !empty(a:1) | let delim = a:1[1:-1] | endif
  call s:ConvertDelimiterToSeparator(a:line, delim)
endfunction

" Public API {{{1
function! tablemode#IsActive() "{{{2
  if g:table_mode_always_active | return 1 | endif

  call s:SetBufferOptDefault('table_mode_active', 0)
  return b:table_mode_active
endfunction

function! tablemode#TableizeInsertMode() "{{{2
  if tablemode#IsActive() && getline('.') =~# (tablemode#table#StartExpr() . g:table_mode_separator . g:table_mode_separator)
    call tablemode#table#AddBorder('.')
    normal! A
  elseif tablemode#IsActive() && getline('.') =~# (tablemode#table#StartExpr() . g:table_mode_separator)
    let column = tablemode#utils#strlen(substitute(getline('.')[0:col('.')], '[^' . g:table_mode_separator . ']', '', 'g'))
    let position = tablemode#utils#strlen(matchstr(getline('.')[0:col('.')], '.*' . g:table_mode_separator . '\s*\zs.*'))
    call tablemode#table#Realign('.')
    normal! 0
    call search(repeat('[^' . g:table_mode_separator . ']*' . g:table_mode_separator, column) . '\s\{-\}' . repeat('.', position), 'ce', line('.'))
  endif
endfunction

function! tablemode#Enable() "{{{2
  call s:SetActive(1)
endfunction

function! tablemode#Disable() "{{{2
  call s:SetActive(0)
endfunction

function! tablemode#Toggle() "{{{2
  if g:table_mode_always_active
    return 1
  endif

  call s:SetBufferOptDefault('table_mode_active', 0)
  call s:SetActive(!b:table_mode_active)
endfunction

function! tablemode#TableizeRange(...) range "{{{2
  let lnum = a:firstline
  while lnum < (a:firstline + (a:lastline - a:firstline + 1))
    call s:Tableizeline(lnum, a:1)
    undojoin
    let lnum += 1
  endwhile

  call tablemode#table#Realign(lnum - 1)
endfunction

function! tablemode#TableizeByDelimiter() "{{{2
  let delim = input('/')
  if delim =~# "\<Esc>" || delim =~# "\<C-C>" | return | endif
  let vm = visualmode()
  if vm ==? 'line' || vm ==? 'V'
    exec line("'<") . ',' . line("'>") . "call tablemode#TableizeRange('/' . delim)"
  endif
endfunction