zsh/Completion/Core/_complete

#autoload

# Generate all possible completions. Note that this is not intended as
# a normal completion function, but as one possible value for the
# completer style.

local comp name oldcontext ret=1
typeset -T curcontext="$curcontext" ccarray

oldcontext="$curcontext"

# If we have a user-supplied context name, use only that.

if [[ -n "$compcontext" ]]; then

  if [[ "${(t)compcontext}" = *(array|assoc)* ]]; then
    local expl

    _wanted values expl value compadd -a - compcontext

  elif [[ "$compcontext" = *:*:* ]]; then
    local tag="${${compcontext%%:*}:-values}"
    local descr="${${${compcontext#${tag}:}%%:*}:-value}"
    local action="${compcontext#${tag}:${descr}:}" expl ws ret=1

    case "$action" in
    \ #)
      _message "$descr";;

    \(\(*\)\))
      eval ws\=\( "${action[3,-3]}" \)

      _describe -t "$tag" "$descr" ws;;

    \(*\))
      eval ws\=\( "${action[2,-2]}" \)

      _wanted "$tag" expl "$descr" compadd -a - ws;;

    \{*\})
      _tags "$tag"
      while _tags; do
        while _next_label "$tag" expl "$descr"; do
          eval "$action[2,-2]" && ret=0
	done
	(( ret )) || break
      done;;

    \ *)
      eval ws\=\( "$action" \)

      _tags "$tag"
      while _tags; do
        while _next_label "$tag" expl "$descr"; do
          "$ws[@]"
	done
	(( ret )) || break
      done;;

    *)
      eval ws\=\( "$action" \)

      _tags "$tag"
      while _tags; do
        while _next_label "$tag" expl "$descr"; do
          "$ws[1]" "$expl[@]" "${(@)ws[2,-1]}"
	done
	(( ret )) || break
      done;;

    esac

  else
    ccarray[3]="$compcontext"

    comp="$_comps[$compcontext]"
    [[ -z "$comp" ]] || "$comp"
  fi

  return
fi

# An entry for `-first-' is the replacement for `compctl -T'

comp="$_comps[-first-]"
if [[ ! -z "$comp" ]]; then
  ccarray[3]=-first-
  "$comp" && ret=0
  if [[ "$_compskip" = all ]]; then
    _compskip=
    return ret
  fi
fi

# If we are inside `vared' and we don't have a $compcontext, we treat
# this like a parameter assignment. Which it is.

[[ -n $compstate[vared] ]] && compstate[context]=vared

# For arguments and command names we use the `_normal' function.

ret=1
if [[ "$compstate[context]" = command ]]; then
  curcontext="$oldcontext"
  _normal -s && ret=0
else
  # Let's see if we have a special completion definition for the other
  # possible contexts.

  local cname="-${compstate[context]:s/_/-/}-"

  ccarray[3]="$cname"

  comp="$_comps[$cname]"

  # If not, we use default completion, if any.

  if [[ -z "$comp" ]]; then
    if [[ "$_compskip" = *default* ]]; then
      _compskip=
      return 1
    fi
    comp="$_comps[-default-]"
  fi
  [[ -z "$comp" ]] || "$comp" && ret=0
fi

_compskip=

return ret