--- /dev/null
+-- middleclass.lua - v2.0 (2011-09)
+-- 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.
+-- Based on YaciCode, from Julien Patte and LuaObject, from Sebastien Rocca-Serra
+
+local _classes = setmetatable({}, { __mode = "k" })
+
+local function _setClassDictionariesMetatables(klass)
+ local dict = klass.__instanceDict
+ dict.__index = dict
+
+ local super = klass.super
+ if super then
+ local superStatic = super.static
+ setmetatable(dict, super.__instanceDict)
+ setmetatable(klass.static, { __index = function(_, k) return dict[k] or superStatic[k] end })
+ else
+ setmetatable(klass.static, { __index = function(_, k) return dict[k] end })
+ end
+end
+
+local function _setClassMetatable(klass)
+ setmetatable(klass, {
+ __tostring = function() return "class " .. klass.name end,
+ __index = klass.static,
+ __newindex = klass.__instanceDict,
+ __call = function(self, ...) return self:new(...) end
+ })
+end
+
+local function _createClass(name, super)
+ local klass = { name = name, super = super, static = {}, __mixins = {}, __instanceDict = {} }
+ klass.subclasses = setmetatable({}, { __mode = "k" })
+
+ _setClassDictionariesMetatables(klass)
+ _setClassMetatable(klass)
+ _classes[klass] = true
+
+ return klass
+end
+
+local function _createLookupMetamethod(klass, name)
+ return function(...)
+ local method = klass.super[name]
+ assert(type(method) == 'function', tostring(klass) .. " doesn't implement metamethod '" .. name .. "'")
+ return method(...)
+ end
+end
+
+local function _setClassMetamethods(klass)
+ for _, m in ipairs(klass.__metamethods) do
+ klass[m] = _createLookupMetamethod(klass, m)
+ end
+end
+
+local function _setDefaultInitializeMethod(klass, super)
+ klass.initialize = function(instance, ...)
+ return super.initialize(instance, ...)
+ end
+end
+
+local function _includeMixin(klass, mixin)
+ assert(type(mixin) == 'table', "mixin must be a table")
+ for name, method in pairs(mixin) do
+ if name ~= "included" and name ~= "static" then klass[name] = method end
+ end
+ if mixin.static then
+ for name, method in pairs(mixin.static) do
+ klass.static[name] = method
+ end
+ end
+ if type(mixin.included) == "function" then mixin:included(klass) end
+ klass.__mixins[mixin] = true
+end
+
+Object = _createClass("Object", nil)
+
+Object.static.__metamethods = {
+ '__add', '__call', '__concat', '__div', '__le', '__lt',
+ '__mod', '__mul', '__pow', '__sub', '__tostring', '__unm'
+}
+
+function Object.static:allocate()
+ assert(_classes[self], "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(_classes[self], "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:include(...)
+ assert(_classes[self], "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:initialize() end
+
+function Object:__tostring() return "instance of " .. tostring(self.class) end
+
+function class(name, super, ...)
+ super = super or Object
+ return super:subclass(name, ...)
+end
+
+function instanceOf(aClass, obj)
+ if not _classes[aClass] or type(obj) ~= 'table' or not _classes[obj.class] then return false end
+ if obj.class == aClass then return true end
+ return subclassOf(aClass, obj.class)
+end
+
+function subclassOf(other, aClass)
+ if not _classes[aClass] or not _classes[other] or aClass.super == nil then return false end
+ return aClass.super == other or subclassOf(other, aClass.super)
+end
+
+function includes(mixin, aClass)
+ if not _classes[aClass] then return false end
+ if aClass.__mixins[mixin] then return true end
+ return includes(mixin, aClass.super)
+end
\ No newline at end of file
projects / platform / upstream / ejdb.git / commitdiff