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#compdef zparseopts

local ret=1
local -a context line state state_descr alts opts
local -A opt_args

_arguments -A '-*' : \
  '-a+[specify array in which to store parsed options]:array:_parameters -g "*array*~*readonly*"' \
  '-A+[specify association in which to store parsed options]:association:_parameters -g "*association*~*readonly*"' \
  '-D[remove parsed options from positional parameters]' \
  "-E[don't stop parsing at first parameter not described by specs]" \
  '-F[abort parsing and print error at first option-like parameter not described by specs]' \
  '-K[preserve contents of arrays/associations when specs are not matched]' \
  '-M[enable mapping among equivalent options with opt1=opt2 spec form]' \
  '(-)-[end zparseopts options; specs follow]' \
  '*: :->spec' \
&& ret=0

[[ $state == spec ]] &&
if compset -P '*='; then
  alts=()
  (( $+opt_args[-M] )) && {
    opts=( $line )
    [[ $opts[1] == (-|--) ]] && shift opts
    opts=( ${(@)opts%%(+|)(:|:-|::|)(=*|)} )
    opts=( ${(@)opts:#${words[CURRENT]%%=*}} )
    alts+=( "spec-opt-names:spec option name:(${(j< >)${(@q+)opts}})" )
  }
  alts+=( 'parameters:array:_parameters -g "*array*~*readonly*"' )
  _alternative $alts && ret=0
else
  # Not great, but close enough for now
  compset -S '=*'
  _message -e spec-opts 'spec option (name[+][:|:-|::])' && ret=0
fi

return ret