2010-09-19 13:37:55 +00:00
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--[[
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Copyright (c) 2010 Matthias Richter
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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Except as contained in this notice, the name(s) of the above copyright holders
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shall not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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]]--
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2011-01-18 16:44:38 +00:00
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local setmetatable, getmetatable = setmetatable, getmetatable
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2011-03-12 22:59:43 +00:00
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local type, assert, pairs, unpack = type, assert, pairs, unpack
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2011-01-18 16:44:38 +00:00
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local tostring, string_format = tostring, string.format
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module(...)
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2010-08-09 15:52:48 +00:00
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local function __NULL__() end
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2011-01-18 16:44:38 +00:00
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function new(constructor)
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2010-08-09 15:52:48 +00:00
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local name = '<unnamed class>'
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2011-03-12 22:59:43 +00:00
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local super = {}
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2010-08-09 15:52:48 +00:00
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if type(constructor) == "table" then
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2011-03-12 22:59:43 +00:00
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local args = constructor
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name = args.name or name
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if args.inherits then
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-- trick: if arg.inherits has a metatable, it is a class
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-- instead of a table (because of the function interface)
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if getmetatable(args.inherits) then
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super = {args.inherits}
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else
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super = args.inherits
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end
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end
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constructor = args[1]
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2010-08-09 15:52:48 +00:00
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end
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assert(not constructor or type(constructor) == "function",
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2011-01-18 16:44:38 +00:00
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string_format('%s: constructor has to be nil or a function', name))
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2010-08-09 15:52:48 +00:00
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-- build class
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local c = {}
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c.__index = c
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2011-01-18 16:44:38 +00:00
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c.__tostring = function() return string_format("<instance of %s>", name) end
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2010-08-09 15:52:48 +00:00
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c.construct = constructor or __NULL__
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2010-11-13 15:53:50 +00:00
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c.Construct = constructor or __NULL__
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2011-01-18 16:44:38 +00:00
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c.inherit = inherit
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c.Inherit = inherit
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2010-08-09 15:52:48 +00:00
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local meta = {
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__call = function(self, ...)
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local obj = {}
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self.construct(obj, ...)
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return setmetatable(obj, self)
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end,
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__tostring = function() return tostring(name) end
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}
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2011-03-12 22:59:43 +00:00
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inherit(c, unpack(super))
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2010-08-09 15:52:48 +00:00
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return setmetatable(c, meta)
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end
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2011-01-18 16:44:38 +00:00
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function inherit(class, interface, ...)
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2011-03-12 22:59:43 +00:00
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if not interface or type(interface) ~= "table" then return end
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2010-08-09 15:52:48 +00:00
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-- __index and construct are not overwritten as for them class[name] is defined
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for name, func in pairs(interface) do
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if not class[name] and type(func) == "function" then
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class[name] = func
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end
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end
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2011-01-18 16:44:38 +00:00
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inherit(class, ...)
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end
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-- class() as shortcut to class.new()
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do
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local m = {}
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m.__call = function(_, ...) return new(...) end
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setmetatable(_M, m)
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2010-08-09 15:52:48 +00:00
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end
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