| local middleclass = { |
| _VERSION = 'middleclass v4.0.0', |
| _DESCRIPTION = 'Object Orientation for Lua', |
| _URL = 'https://github.com/kikito/middleclass', |
| _LICENSE = [[ |
| MIT LICENSE |
| |
| Copyright (c) 2011 Enrique GarcĂa 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 _createIndexWrapper(aClass, f) |
| if f == nil then |
| return aClass.__instanceDict |
| else |
| return function(self, name) |
| local value = aClass.__instanceDict[name] |
| |
| if value ~= nil then |
| return value |
| elseif type(f) == "function" then |
| return (f(self, name)) |
| else |
| return f[name] |
| end |
| end |
| end |
| end |
| |
| local function _propagateInstanceMethod(aClass, name, f) |
| f = name == "__index" and _createIndexWrapper(aClass, f) or f |
| aClass.__instanceDict[name] = f |
| |
| for subclass in pairs(aClass.subclasses) do |
| if rawget(subclass.__declaredMethods, name) == nil then |
| _propagateInstanceMethod(subclass, name, f) |
| end |
| end |
| end |
| |
| local function _declareInstanceMethod(aClass, name, f) |
| aClass.__declaredMethods[name] = f |
| |
| if f == nil and aClass.super then |
| f = aClass.super.__instanceDict[name] |
| end |
| |
| _propagateInstanceMethod(aClass, name, f) |
| end |
| |
| local function _tostring(self) return "class " .. self.name end |
| local function _call(self, ...) return self:new(...) end |
| |
| local function _createClass(name, super) |
| local dict = {} |
| dict.__index = dict |
| |
| local aClass = { name = name, super = super, static = {}, |
| __instanceDict = dict, __declaredMethods = {}, |
| subclasses = setmetatable({}, {__mode='k'}) } |
| |
| if super then |
| setmetatable(aClass.static, { __index = function(_,k) return rawget(dict,k) or super.static[k] end }) |
| else |
| setmetatable(aClass.static, { __index = function(_,k) return rawget(dict,k) end }) |
| end |
| |
| setmetatable(aClass, { __index = aClass.static, __tostring = _tostring, |
| __call = _call, __newindex = _declareInstanceMethod }) |
| |
| return aClass |
| 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 |
| |
| for name,method in pairs(mixin.static or {}) do |
| aClass.static[name] = method |
| end |
| |
| if type(mixin.included)=="function" then mixin:included(aClass) end |
| return aClass |
| end |
| |
| local DefaultMixin = { |
| __tostring = function(self) return "instance of " .. tostring(self.class) end, |
| |
| initialize = function(self, ...) end, |
| |
| isInstanceOf = function(self, 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, |
| |
| static = { |
| allocate = function(self) |
| assert(type(self) == 'table', "Make sure that you are using 'Class:allocate' instead of 'Class.allocate'") |
| return setmetatable({ class = self }, self.__instanceDict) |
| end, |
| |
| new = function(self, ...) |
| assert(type(self) == 'table', "Make sure that you are using 'Class:new' instead of 'Class.new'") |
| local instance = self:allocate() |
| instance:initialize(...) |
| return instance |
| end, |
| |
| subclass = function(self, 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) |
| |
| for methodName, f in pairs(self.__instanceDict) do |
| _propagateInstanceMethod(subclass, methodName, f) |
| end |
| subclass.initialize = function(instance, ...) return self.initialize(instance, ...) end |
| |
| self.subclasses[subclass] = true |
| self:subclassed(subclass) |
| |
| return subclass |
| end, |
| |
| subclassed = function(self, other) end, |
| |
| isSubclassOf = function(self, 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, |
| |
| include = function(self, ...) |
| 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 middleclass.class(name, super) |
| assert(type(name) == 'string', "A name (string) is needed for the new class") |
| return super and super:subclass(name) or _includeMixin(_createClass(name), DefaultMixin) |
| end |
| |
| setmetatable(middleclass, { __call = function(_, ...) return middleclass.class(...) end }) |
| |
| return middleclass |