Reuh/classtoi
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0.1.3

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Reuh 2016-12-24 17:52:57 +01:00
parent bd9d989b4d
commit 0214c99cc4
2 changed files with 18 additions and 12 deletions
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3
changelog.txt
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@ -1,3 +1,6 @@
0.1.3:
- Added __name attribute in BaseClass for a more informative __tostring.
- Fixed instanciation error when no custom :new method is defined.
0.1.2:
- Calling class.new(table, ...) now call the class constructor on the table instead of creating a new object.
0.1.1:

27
classtoi.lua
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@ -1,4 +1,4 @@
--- Reuh's class library version 0.1.2. Lua 5.1-5.3 and LuaJit compatible.
--- Reuh's class library version 0.1.3. Lua 5.1-5.3 and LuaJit compatible.
-- Objects and classes behavior are identical, so you can consider this to be somewhat prototype-based.
-- Features:
-- * Multiple inheritance with class(parents...) or someclass(newstuff...)
@ -21,8 +21,9 @@
-- except __super and __index, but __index should call your __index and act like you expect. __super will however always be the default one
-- and doesn't proxy in any way yours.
--
-- Please also note that the last universal ancestor of the classes (defined here in BaseClass) sets the default __tostring method for nice
-- class-name-printing. Unlike previous text however, it is done in a normal inheritance-way and can be rewritten without any problem.
-- Please also note that the last universal ancestor of the classes (defined here in BaseClass) sets the default __tostring method
-- and __name attribute for nice class-name-printing. Unlike the previoulsy described attributes and methods however, it is done in a normal
-- inheritance-way and can be rewritten without any problem (rewritting __name is especially useful to easily identify your classes).
-- Lua versions compatibility
local unpack = table.unpack or unpack
@ -50,7 +51,7 @@ methods = {
-- In pratise, this only subclass the class and call the new method on it, so technically an object is a class.
-- Objects are exaclty like classes, but the __call metamethod will be replaced by one found in the parents,
-- or nil if doesn't exist (so an object is not directly subclassable).
-- (If no __call method is defined in a parent, you won't be able to call the object, but obj.__class will still
-- (If no __call method is defined in a parent, you won't be able to call the object, but obj.__call will still
-- returns the default (subclassing) method, from one of the parents classes.)
-- The same happens with :new and :is, but since they're not metamethods, if not defined in a parent you won't
-- notice any difference.
@ -67,7 +68,7 @@ methods = {
different = methods.__call rawset(obj, "__call", obj:__index("__call") or nil)
different = nil
-- Call constructor
if obj.new ~= methods.new and type(obj.new) == "function" then obj:new(...) end
if obj.new ~= methods["!new"] and type(obj.new) == "function" then obj:new(...) end
return obj
else
different = methods["!new"]
@ -100,8 +101,8 @@ methods = {
end,
--- Internal value getting; this follows a precise search order.
-- For example: class(Base1, Base2){stuff}
-- When getting a value from the class, it will be first searched in stuff, then in Base2, then in all Base2 parents,
-- then in Base1, then in Base1 parents.
-- When getting a value from the class, it will be first searched in stuff, then in Base1, then in all Base1 parents,
-- then in Base2, then in Base2 parents.
-- A way to describe this will be search in the latest added tables (from the farthest child to the first parents), from left-to-right.
__index = function(self, k)
local proxied = methods["!"..tostring(k)]
@ -147,10 +148,11 @@ end
--- The class which will be a parents for all the other classes.
-- We add some pretty-printing default in here. We temporarly remove the metatable in order to avoid a stack overflow.
BaseClass = makeclass {
__name = "class",
__tostring = function(self)
local mt = getmetatable(self)
local mt, name = getmetatable(self), self.__name
setmetatable(self, nil)
local str = ("class (%s)"):format(tostring(self))
local str = ("%s (%s)"):format(tostring(name), tostring(self))
setmetatable(self, mt)
return str
end
@ -162,11 +164,12 @@ if common_class and not common then
common = {}
-- class = common.class(name, table, parents...)
function common.class(name, table, ...)
table.new = table.init
return BaseClass(table, ...)
return BaseClass(table, ...){ __name = name, new = table.init }
end
-- instance = common.instance(class, ...)
function common.instance(class, ...) return class:new(...) end
function common.instance(class, ...)
return class:new(...)
end
end
return BaseClass