Модуль ns_defaultkey для AOL Server

Описание модуля приведено в комментарии в коде.

#    Copyright 2009, Mobile Business Group
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see http://www.gnu.org/licenses/.

package require json

# простой интерфейс для управления значениями по умолчанию
# проверки аргументов убраны, т.к. это лишний оверхед, а функции вызываются очень часто
# позволяет установить дефолтовые значения сразу для всех пользователей и сессий
proc ns_defaultkey {action args} {
    if {$action eq {exists}} {
        return [nsv_exists defaultkeys_[lindex $args 0] [lindex $args 1]]
    } elseif {$action eq {names}} {
        return [nsv_array names defaultkeys_[lindex $args 0]]
    } elseif {$action eq {get}} {
        if {[nsv_exists defaultkeys_[lindex $args 0] [lindex $args 1]] == 1} {
            return [nsv_get defaultkeys_[lindex $args 0] [lindex $args 1]]
        }
        return
    } elseif {$action eq {get_escape}} {
        return [::json::string_escape [ns_defaultkey get {*}$args]]
    } elseif {$action eq {set}} {
        nsv_set defaultkeys_[lindex $args 0] [lindex $args 1] [lindex $args 2]
        return [lindex $args 2]
    } elseif {$action eq {add}} {
        nsv_set defaultkeys_[lindex $args 0] [lindex $args 1] [concat [nsv_set defaultkeys_[lindex $args 0] [lindex $args 1]] [lindex $args 2]]
        return [nsv_get defaultkeys_[lindex $args 0] [lindex $args 1]]
    } elseif {$action eq {aset}} {
        nsv_array set defaultkeys_[lindex $args 0] [lindex $args 1]
    } elseif {$action eq {aget}} {
        return [nsv_array get defaultkeys_[lindex $args 0]]
    }
}