Lua OO Library - bmclass

[bmzz]

i have no idea about naming =p...
so i called it bmclass

download

bmclass.lua

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Example1 - basic

Code: Select all

 
class = require("bmclass")
 
a = class("a")
 
function a:init(attrs)
    self.x = attrs.x
    self.y = attrs.y
    
    print("for init")
end
 
function a:info()
    print(tostring(self) .. " : Hello!!!")
    print(self.x)
    print(self.y)
end
 
b = a("b", {x = 100, y = 200}) -- output "for init"
b:info()
-- output
-- b : Hello!!!
-- 100
-- 200

print(b.x) -- output "100"

Example2 - Multiple inheritance

Code: Select all

 
class = require("bmclass")
 
a = class("a")
b = class("b")
c = class("c", a, b) -- superclass a and b
 
function a:init() print("a init") end
function b:init() print("b init") end
function c:init()
    c:next(self, "init") -- next to the superclass
    print("c init")
end
 
function a:hello1() print("Hello1") end
function b:hello2() print("Hello2") end
function c:hello3() print("Hello3") end
 
d = c("d")
-- output
-- a init
-- b init
-- c init
 
d:hello1() -- output "Hello1"
d:hello2() -- output "Hello2"
d:hello3() -- output "Hello3"

any idea?

thanks

[ishkabible]

dose it support data member inheritance? that's the things that always gets me about inheritance in Lua.

[Kadoba]

dose it support data member inheritance? that's the things that always gets me about inheritance in Lua.

Can't you just copy all of the members in a for loop?

Code: Select all

for k,v in pairs(parent)
   if type(v) == "number" or type(v) == "string" then
      child[k] = v
   end
end

or maybe I'm missing something.

[Robin]

Can't you just copy all of the members in a for loop?

Metatables are better suited for that. (Besides, you are missing booleans. )

[ishkabible]

also, i don't want to have to do that, i want the OO mechanism to do that for me.

Mod edit: There's a delete button, you know.

[bmzz]

also, i don't want to have to do that, i want the OO mechanism to do that for me.

Mod edit: There's a delete button, you know.

Hi, look at the Example1 that i modified it.
It support data member inheritance.

[Ensayia]

Oh look, another OO library.

We have like what, 5 now?

[ishkabible]

lol, i guess. i typically just role my own classes in Lua. i have a working template that i use

Code: Select all

--includes go here
Widget = require "widget"

--declare type and metatable, both as local so they don't interfer with other things
local Lable = {}
local mt = {__index = Lable}

--inhertance goes here
setmetatable(Lable, {__index = Widget})

--cache any namespaces
local getColor = love.graphics.getColor
local setColor = love.graphics.setColor
local setFont = love.graphics.setFont
local drawRect = love.graphics.rectangle
local drawPrintf = love.graphics.printf
local getFont = love.graphics.getFont

--create the constructor here, organize the data members neatly somehow
function Lable:new(x,y,w,h,stext)
	return setmetatable( {x, y, w, h,
						 Handle = nil,
						 text = stext,
						 algin = "left",
						 font = getFont(),
						 color = {getColor()},
						 
	},mt)
end

--functions go here

function Lable:Draw()
	setColor(self.color)
	setFont(self.font)
	drawPrintf(self.text, self:GetX(), self:GetY(), self:GetW(), self.algin)
end

function Lable:__tostring()
	return self.text
end

function Lable:Type()
	return "Lable"
end

function Lable:SetText(text)
	self.text = text
end 

function Lable:SetColor(r, b, g, a)
	if type(r) == "table" then
		self.color = {unpack(r)}
	else
		self.color = {r, b, g, a}
	end
end

function Lable:GetFont()
	return self.font
end

function Lable:SetFont(font)
	self.font = font
end

function Lable:SetAlign(a)
	self.algin = a
end

function Lable:GetColor()
	return unpack(self.color)
end

function Lable:GetText()
	return self.text
end

--return the type that was created
return Lable

the downside is that i have to re-declare members from inherited types. i could create a something to do it for me but im lazy i guess.

edit:
im gonna make another and call it "YAOOL", Yet Another OO Lib

[BlackBulletIV]

Oh look, another OO library.

Is that a bad thing? It's all good messing around with Lua.

[Ensayia]

Oh look, another OO library.

Is that a bad thing? It's all good messing around with Lua.

It's not necessarily a bad thing at all, it's just that this community is far more interested in reinventing the wheel than making any actual games with this game framework.

I've already gotten my karma dinged for pointing out the obvious, so I'll drop the issue now.