zsh/Completion/Builtins/_zstyle

#compdef zstyle

local curcontext="$curcontext" state context ostate line expl ctop
local nm=$compstate[nmatches] mesg
typeset -A opt_args

typeset -A styles
# Assoc array of styles; the values give the possible top-level
# contexts (currently c for completion, z for zftp or cz for both),
# followed by a colon, followed by a state to enter, empty if none.
styles=(
  accept-exact		 c:bool
  add-space		 c:bool
  ambiguous              c:bool
  assign-list            c:
  auto-description	 c:
  break-keys             c:
  command                c:command
  completer		 c:completer
  completions		 c:
  condition		 c:
  cursor		 c:cursor
  disable-stat		 c:bool
  domains                c:
  expand		 c:
  file-patterns		 c:filepat
  file-sort              c:fsort
  force-list             c
  format		 c:
  glob			 c:
  group-name		 c:
  group-order		 c:tag
  groups		 c:_groups
  guarded-completer      c:completer
  hidden		 c:bool
  hosts			 c:_hosts
  hosts-ports		 c:host-port
  users-hosts-ports	 c:user-host-port
  ignore-line            c:bool
  ignore-parents         c:ignorepar
  ignored-patterns	 c:
  insert-ids             c:insert-ids
  insert-tab             c:bool
  insert-unambiguous	 c:bool
  last-prompt		 c:bool
  list			 c:listwhen
  list-colors		 c:
  list-packed		 c:bool
  list-prompt            c:
  list-rows-first	 c:bool
  local			 c:
  matcher-list		 c:
  max-errors		 c:
  menu			 c:boolauto
  numbers		 c:bool
  original		 c:bool
  packageset		 c:packageset
  path			 'c:_wanted directories expl directory _path_files -/'
  ports			 c:_ports
  prefix-hidden		 c:bool
  prefix-needed		 c:bool
  prompt		 c:
  remove-all-dups	 c:bool
  select-prompt          c:
  select-scroll          c:
  single-ignored         c:single-ignored
  sort			 c:bool
  special-dirs		 c:sdirs
  squeeze-slashes	 c:bool
  stop			 c:stop
  stop-keys		 c:
  subst-globs-only       c:
  substitute		 c:
  tag-order		 c:tag
  users			 c:_users
  users-hosts		 c:user-host
  verbose		 c:bool
  word			 c:bool

  chpwd			 z:bool
  progress		 z:progress
  remote_glob		 z:bool
  titlebar		 z:bool
  update		 z:
)

local taglist
taglist=(accounts all-files all-expansions arguments arrays
association-keys bookmarks builtins characters colors commands corrections
cursors cvs default descriptions devices directories directory-stack
displays expansions extensions files fonts functions globbed-files groups
history-words hosts indexes jobs keymaps keysyms local-directories
libraries limits manuals maps messages modifiers modules my-accounts
named-directories names nicknames options original other-accounts packages
parameters path-directories paths pods ports prefixes processes ps regex
sequences sessions signals strings tags targets types urls users values
warnings widgets windows zsh-options)

_arguments -C ':context:->contexts' ':style:->styles' '*:argument:->style-arg'

while [[ -n $state ]]; do
  ostate=$state
  state=

  case "$ostate" in
    contexts)
      if [[ $PREFIX != :*: ]]; then
	_wanted contexts expl context compadd -P : -S : completion zftp
      elif [[ $PREFIX = :completion:* ]] && _tags contexts; then
        mesg=''
        case "$PREFIX" in
        :completion:[^:]#) mesg=function ;;
        :completion:[^:]#:[^:]#) mesg=completer ;;
        :completion:[^:]#:[^:]#:[^:]#) mesg='command or context' ;;
        :completion:[^:]#:[^:]#:[^:]#:[^:]#) mesg=argument ;;
        :completion:[^:]#:[^:]#:[^:]#:[^:]#:[^:]#) mesg=tag ;;
	esac
	[[ -n "$mesg" ]] && _message "$mesg"
      fi
      ;;

    styles)
      # Get the top-level context we're completing for, if any.
      if [[ $words[2] = :(completion|zftp):* ]]; then
	ctop=${words[2][2]}
      else
        ctop=cz
      fi
      _wanted styles expl style \
         compadd -M 'r:|-=* r:|=*' - ${(k)styles[(R)[^:]#[$ctop][^:]#:*]}
      ;;
      
    style-arg)
      state="${styles[$words[3]]#*:}"
      ;;

    bool) 
      _wanted values expl boolean compadd true false
      ;;

    boolauto) 
      _wanted values expl boolean compadd true false auto select
      ;;

    cursor)
      _wanted values expl 'cursor positioning' compadd complete key default
      ;;

    completer)
      _wanted values expl completer \
	compadd _complete _approximate _correct _match \
                _expand _list _menu _oldlist _next_tags
      ;;

    fsort)
      _wanted values expl 'how to sort files' \
	compadd name size links time date modification access inode change reverse
      ;;

    user-host-port)
      if [[ $PREFIX != *[@:]* ]]; then
	_users -S @
      elif [[ $PREFIX = *[@:]*[[@:]* ]]; then
	compset -P 2 '*[:@]'
	_ports
      else
	compset -P 1 '*[:@]'
	_hosts -S :
      fi
      ;;

    host-port)
      if [[ $PREFIX != *:* ]]; then
	_hosts -S :
      else
	compset -P 1 '*:'
	_ports
      fi
      ;;

    listwhen)
      _wanted values expl 'when to list completions' \
	compadd always never sometimes
      ;;

    packageset)
      _wanted values expl 'default package set' \
        compadd available installed uninstalled
      ;;

    progress)
      _wanted values expl 'progress meter style' \
        compadd none bar percent
      ;;

    sdirs)
      _wanted values expl 'whether to complete . or ..' \
        compadd true false ..
      ;;

    stop)
      _wanted values expl 'when to insert matches' \
	compadd true false verbose
      ;;

    tag)
      compset -q
      if compset -P '*:*:'; then
        _message description
      elif compset -P '*:'; then
        _message 'tag alias'
      else
        _wanted tags expl tag compadd - $taglist
      fi
      ;;

    filepat)
      if compset -P '*:*:'; then
        _message description
      elif compset -P '*:'; then
        _message tag
      else
        _message 'glob patterns'
      fi
      ;;

    user-host)
      if [[ $PREFIX = *[@:]* ]]; then
	compset -P '*[@:]'
	_hosts
      else
	_users -S @
      fi
      ;;

    ignorepar)
      _wanted values expl 'which parents to ignore' \
        compadd parent pwd .. directory
      ;;

    single-ignored)
      _wanted values expl 'how to handle a single ignored match' \
          compadd - show menu
      ;;

    command)
      shift 3 words
      (( CURRENT -= 3 ))
      _normal
      ;;

    insert-ids)
      _wanted values expl 'when to insert process IDs' \
          compadd - menu single longer
      ;;

    _*)
      ${=ostate}
      ;;

    *)
      ;;
  esac
done

[[ $compstate[nmatches] != $nm ]]