Module:Middleclass

local middleclass = { _VERSION    = 'middleclass v3.0.1', _DESCRIPTION = 'Object Orientation for Lua', _URL        = 'https://github.com/kikito/middleclass', _LICENSE    = [[    MIT LICENSE

Copyright (c) 2011 Enrique García Cota

Permission is hereby granted, free of charge, to any person obtaining a   copy of this software and associated documentation files (the    "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to   permit persons to whom the Software is furnished to do so, subject to    the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ]] }

local function _setClassDictionariesMetatables(aClass) local dict = aClass.__instanceDict dict.__index = dict

local super = aClass.super if super then local superStatic = super.static setmetatable(dict, super.__instanceDict) setmetatable(aClass.static, { __index = function(_,k) return dict[k] or superStatic[k] end }) else setmetatable(aClass.static, { __index = function(_,k) return dict[k] end }) end end

local function _setClassMetatable(aClass) setmetatable(aClass, {   __tostring = function return "class " .. aClass.name end,    __index    = aClass.static,    __newindex = aClass.__instanceDict,    __call     = function(self, ...) return self:new(...) end  }) end

local function _createClass(name, super) local aClass = { name = name, super = super, static = {}, __mixins = {}, __instanceDict={} } aClass.subclasses = setmetatable({}, {__mode = "k"})

_setClassDictionariesMetatables(aClass) _setClassMetatable(aClass)

return aClass end

local function _createLookupMetamethod(aClass, name) return function(...) local method = aClass.super[name] assert( type(method)=='function', tostring(aClass) .. " doesn't implement metamethod '" .. name .. "'" ) return method(...) end end

local function _setClassMetamethods(aClass) for _,m in ipairs(aClass.__metamethods) do   aClass[m]= _createLookupMetamethod(aClass, m)  end end

local function _setDefaultInitializeMethod(aClass, super) aClass.initialize = function(instance, ...) return super.initialize(instance, ...) end end

local function _includeMixin(aClass, mixin) assert(type(mixin)=='table', "mixin must be a table") for name,method in pairs(mixin) do   if name ~= "included" and name ~= "static" then aClass[name] = method end end if mixin.static then for name,method in pairs(mixin.static) do     aClass.static[name] = method end end if type(mixin.included)=="function" then mixin:included(aClass) end aClass.__mixins[mixin] = true end

local Object = _createClass("Object", nil)

Object.static.__metamethods = { '__add', '__call', '__concat', '__div', '__ipairs', '__le', '__len', '__lt', '__mod', '__mul', '__pairs', '__pow', '__sub', '__tostring', '__unm'}

function Object.static:allocate assert(type(self) == 'table', "Make sure that you are using 'Class:allocate' instead of 'Class.allocate'") return setmetatable({ class = self }, self.__instanceDict) end

function Object.static:new(...) local instance = self:allocate instance:initialize(...) return instance end

function Object.static:subclass(name) assert(type(self) == 'table', "Make sure that you are using 'Class:subclass' instead of 'Class.subclass'") assert(type(name) == "string", "You must provide a name(string) for your class")

local subclass = _createClass(name, self) _setClassMetamethods(subclass) _setDefaultInitializeMethod(subclass, self) self.subclasses[subclass] = true self:subclassed(subclass)

return subclass end

function Object.static:subclassed(other) end

function Object.static:isSubclassOf(other) return type(other)                  == 'table' and type(self)                   == 'table' and type(self.super)             == 'table' and ( self.super == other or          type(self.super.isSubclassOf) == 'function' and           self.super:isSubclassOf(other)         ) end

function Object.static:include( ... ) assert(type(self) == 'table', "Make sure you that you are using 'Class:include' instead of 'Class.include'") for _,mixin in ipairs({...}) do _includeMixin(self, mixin) end return self end

function Object.static:includes(mixin) return type(mixin)         == 'table' and type(self)          == 'table' and type(self.__mixins) == 'table' and ( self.__mixins[mixin] or          type(self.super)           == 'table' and           type(self.super.includes)  == 'function' and           self.super:includes(mixin)         ) end

function Object:initialize end

function Object:__tostring return "instance of " .. tostring(self.class) end

function Object:isInstanceOf(aClass) return type(self)               == 'table' and type(self.class)         == 'table' and type(aClass)             == 'table' and ( aClass == self.class or          type(aClass.isSubclassOf) == 'function' and           self.class:isSubclassOf(aClass)         ) end

function middleclass.class(name, super, ...) super = super or Object return super:subclass(name, ...) end

middleclass.Object = Object

setmetatable(middleclass, { __call = function(_, ...) return middleclass.class(...) end })

return middleclass