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-- tkz_elements_class.lua
-- date 2024/07/16
-- version 3.00
-- from class.lua (Simple Lua Classes from Lua-users wiki)
-- Compatible with Lua 5.1 (not 5.0).
-- http://lua-users.org/wiki/SimpleLuaClasses DavidManura
function class(base, init)
local c = {} -- a new class instance
if not init and type(base) == 'function' then
init = base
base = nil
elseif type(base) == 'table' then
-- our new class is a shallow copy of the base class!
for i,v in pairs(base) do
c[i] = v
end
c._base = base
end
-- the class will be the metatable for all its objects,
-- and they will look up their methods in it.
c.__index = c
-- expose a constructor which can be called by <classname>(<args>)
local mt = {}
mt.__call = function(class_tbl, ...)
local obj = {}
setmetatable(obj,c)
if init then
init(obj,...)
else
-- make sure that any stuff from the base class is initialized!
if base and base.init then
base.init(obj, ...)
end
end
return obj
end
c.init = init
c.is_a = function(self, klass)
local m = getmetatable(self)
while m do
if m == klass then return true end
m = m._base
end
return false
end
setmetatable(c, mt)
return c
end
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