"Vanilla" Lua doesn't have any mechanisms to do OOP-style programming.
With this library, I'm trying to add them using a couple of functions: class and extend.
These are pretty straightforward and I tried to write readable code.
- Simple class:
local class = require 'class'
local Foo = class {
init = function (self) print 'Foo.init' end
}
local obj = Foo() -- outputs Foo.init- Class with a field:
local class = require 'class'
local Foo = class {
bar = 0,
init = function (self) self.bar = 1 end
}
local obj = Foo()
print(obj.bar) -- outputs 1- Class with a method:
local class = require 'class'
local Foo = class {
bar = function (self) print 'Foo.bar' end
}
Foo():bar() -- outputs Foo.barFoo extends Bar:
local class = require 'class'
local Foo = class {
init = function (self) print 'Foo.init' end
}
local Bar = class.extend(Foo) {
init = function (self) print 'Bar.init' end
}
Bar() -- outputs Bar.init- Superclass constructor invocation:
local class = require 'class'
local class = require 'class'
local Foo = class {
init = function (self) print 'Foo.init' end
}
local Bar = class.extend(Foo) {
init = function (self) self.super.init() print 'Bar.init' end
}
Bar() -- outputs Foo.init<newline>Bar.init-
class(cls, parent?) creates a class based on
cls, optionally with superclassparent -
extend(parent) is a two-step
class(cls, parent):extend(Foo) {}is the same asclass({}, Foo) -
static(smth) marks a field as static:
{ static_field = static(nil) }