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#compdef -subscript-

local expl ind osuf=']' flags sep

if [[ "$1" = -q ]]; then
  compquote osuf
  osuf+=' '
  shift
fi

compset -P '\(([^\(\)]|\(*\))##\)' # remove subscript flags

# Look for a dynamic name expansion.  Completion only gives us
# the stuff inside the square brackets; we need to find out what's
# outside.  We ought to check for quoting, really, but given we've
# got to the subscript code " ~[" is pretty likely to be a dynamic
# name expansion.  Also expand in anything that looks like an assignment
# or colon list.
integer pos=$((CURSOR+1))
while [[ pos -gt 1 && $BUFFER[pos-1] != '[' ]]; do (( pos-- )); done
if [[ $BUFFER[1,pos-1] = *[[:space:]:=]##\~\[ ]]; then
  _dynamic_directory_name
elif [[ "$PREFIX" = :* ]]; then
  _wanted characters expl 'character class' \
      compadd -p: -S ':]' alnum alpha ascii blank cntrl digit graph \
                          lower print punct space upper xdigit
elif compset -P '\('; then
  local match
  compset -S '\)*'

  if [[ $PREFIX = (#b)*([bns])(?|)(*) ]]; then
    local f=$match[1] d=$match[2] e=$match[2] v=$match[3]
    [[ $f = s && ${(Pt)${compstate[parameter]}} != scalar* ]] && return 1
    if [[ -z $d ]]; then
      _message -e delimiters 'delimiter'
      return
    else
      case $d in
      (\() e=\);;
      (\[) e=\];;
      (\{) e=\};;
      esac
      if [[ $v != *$e* ]]; then
	case $f in
	(s) _message 'separator string';;
	(b|n) [[ $v = <-># ]] && _message 'number' || return 1;;
	esac
	[[ -n $v && $SUFFIX$ISUFFIX != *$e* ]] && _message 'delimiter'
	return 0
      fi
    fi
  fi

  case ${(Pt)${compstate[parameter]}} in
    assoc*) flags=(
      '(R k K i I)r[any one value matched by subscript as pattern]'
      '(r k K i I)R[all values matched by subscript as pattern]'
      '(r R K i I)k[any one value where subscript matched by key as pattern]'
      '(r R k i I)K[all values where subscript matched by key as pattern]'
      '(r R k K I)i[any one key matched by subscript as pattern]'
      '(r R k K i)I[all keys matched by subscript as pattern]'
      'e[interpret * or @ as a single key]'
    );;
    (|scalar*)) flags=(
      'w[make subscripting work on words of scalar]'
      's[specify word separator]'
      'p[recognise escape sequences in subsequent s flag]'
    );&
    array*) flags=($flags
      'e[interpret * or @ as a single key and use plain string matching]'
      'n[Nth lowest/highest index with i/I/r/R flag]'
      'b[begin with specified element]'
      '(r R k K i)I[highest index of value matched by subscript]'
      '(r R k K I)i[lowest index of value matched by subscript]'
      '(r k K i I)R[value matched by subscript at highest index]'
      '(R k K i I)r[value matched by subscript at lowest index]'
    );;
  esac

  _values -s '' 'subscript flags' $flags
elif [[ ${(Pt)${compstate[parameter]}} = assoc* ]]; then
  local suf MATCH MBEGIN MEND
  local -a keys
  keys=(${${(kP)compstate[parameter]}//(#m)[\$\\\[\]\(\)\[\{\}]/\\$MATCH})
  keys=(${keys//#%(#m)[*@]/(e)$MATCH})
  [[ "$RBUFFER" != (|\\)\]* ]] && suf="$osuf"

  _wanted association-keys expl 'association key' \
      compadd -Q -S "$suf" -a keys
elif [[ ${(Pt)${compstate[parameter]}} = array* ]]; then
  local list i j ret=1 disp

  _tags indexes parameters

  while _tags; do
    if _requested indexes; then
      ind=( {1..${#${(P)${compstate[parameter]}}}} )
      if zstyle -T ":completion:${curcontext}:indexes" verbose; then
        list=()
        for i in "$ind[@]"; do
          if [[ "$i" = ${PREFIX}*${SUFFIX} ]]; then
              list=( "$list[@]" 
	             "${i}:$(print -D ${(P)${compstate[parameter]}[$i]})" )
	  else
	      list=( "$list[@]" '' )
	  fi
        done
        zstyle -s ":completion:${curcontext}:indexes" list-separator sep || sep=--
        zformat -a list " $sep " "$list[@]"
	disp=( -d list)
      else
        disp=()
      fi

      if [[ "$RBUFFER" = (|\\)\]* ]]; then
        _all_labels -V indexes expl 'array index' \
            compadd -S '' "$disp[@]" -a ind && ret=0
      else
        _all_labels -V indexes expl 'array index' \
            compadd -S "$osuf" "$disp[@]" -a ind && ret=0
      fi
    fi
    _requested parameters && _parameters && ret=0

    (( ret )) || return 0
  done

  return 1
else
  _dispatch -math- -math-
fi

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