mirror of
https://github.com/vrld/HC.git
synced 2024-12-08 15:04:23 +00:00
100 lines
3.4 KiB
Lua
100 lines
3.4 KiB
Lua
--[[
|
|
Copyright (c) 2010-2011 Matthias Richter
|
|
|
|
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.
|
|
|
|
Except as contained in this notice, the name(s) of the above copyright holders
|
|
shall not be used in advertising or otherwise to promote the sale, use or
|
|
other dealings in this Software without prior written authorization.
|
|
|
|
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 __NULL__() end
|
|
|
|
-- class "inheritance" by copying functions
|
|
local function inherit(class, interface, ...)
|
|
if not interface then return end
|
|
assert(type(interface) == "table", "Can only inherit from other classes.")
|
|
|
|
-- __index and construct are not overwritten as for them class[name] is defined
|
|
for name, func in pairs(interface) do
|
|
if not class[name] then
|
|
class[name] = func
|
|
end
|
|
end
|
|
for super in pairs(interface.__is_a or {}) do
|
|
class.__is_a[super] = true
|
|
end
|
|
|
|
return inherit(class, ...)
|
|
end
|
|
|
|
-- class builder
|
|
local function new(args)
|
|
local super = {}
|
|
local name = '<unnamed class>'
|
|
local constructor = args or __NULL__
|
|
if type(args) == "table" then
|
|
-- nasty hack to check if args.inherits is a table of classes or a class or nil
|
|
super = (args.inherits or {}).__is_a and {args.inherits} or args.inherits or {}
|
|
name = args.name or name
|
|
constructor = args[1] or __NULL__
|
|
end
|
|
assert(type(constructor) == "function", 'constructor has to be nil or a function')
|
|
|
|
-- build class
|
|
local class = {}
|
|
class.__index = class
|
|
class.__tostring = function() return ("<instance of %s>"):format(tostring(class)) end
|
|
class.construct = constructor or __NULL__
|
|
class.inherit = inherit
|
|
class.__is_a = {[class] = true}
|
|
class.is_a = function(self, other) return not not self.__is_a[other] end
|
|
|
|
-- inherit superclasses (see above)
|
|
inherit(class, unpack(super))
|
|
|
|
-- syntactic sugar
|
|
local meta = {
|
|
__call = function(self, ...)
|
|
local obj = {}
|
|
setmetatable(obj, self)
|
|
self.construct(obj, ...)
|
|
return obj
|
|
end,
|
|
__tostring = function() return name end
|
|
}
|
|
return setmetatable(class, meta)
|
|
end
|
|
|
|
-- interface for cross class-system compatibility (see https://github.com/bartbes/Class-Commons).
|
|
if common_class ~= false and not common then
|
|
common = {}
|
|
function common.class(name, prototype, parent)
|
|
local init = prototype.init or (parent or {}).init
|
|
return new{name = name, inherits = {prototype, parent}, init}
|
|
end
|
|
function common.instance(class, ...)
|
|
return class(...)
|
|
end
|
|
end
|
|
|
|
-- the module
|
|
return setmetatable({new = new, inherit = inherit},
|
|
{__call = function(_,...) return new(...) end})
|