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middleclass.lua
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182 lines (148 loc) · 5.97 KB
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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