lua-resty-class

Python multiple inheritance class (mro) implementation.

install

    opm get xiangnanscu/lua-resty-class

Synopsis

    local class = require("resty.class")
    local object = require("resty.object")
    
    local function pmro(C)
      local res = {}
      for i, e in ipairs(C.__mro__) do
        table.insert(res, e.__name__)
      end
      print(table.concat(res, ' > '))
    end
    
    local A = class 'A' ()
    function A.init(self, n)
      self.n = n
    end
    
    function A.echo(self)
      print("echo A", self.n)
    end
    
    local B = class { A } ()
    B.__name__ = 'B'
    function B.init(self, n)
      self.n = n
    end
    
    function B.echo(self)
      self:super(B):echo()
      print("echo B", self.n)
    end
    
    local C = class 'C' { B, A } ()
    function C.init(self, n)
      self.n = n
    end
    
    function C.echo(self)
      self:super(C):echo()
      print("echo C", self.n)
    end
    
    local o = object()
    local a = A(1)
    local b = B(10)
    local c = C(100)
    print(tostring(o), tostring(object))
    print(tostring(a), tostring(A))
    print(tostring(b), tostring(B))
    print(tostring(c), tostring(C))
    c:echo()
    pmro(C)
    
    local A = class()
    local B = class 'B' {}
    local C = class 'C' {}
    local D = class 'D' {}
    local E = class 'E' {}
    local K1 = class 'K1' { A, B, C } {}
    local K2 = class 'K2' { D, B, E } {}
    local K3 = class 'K3' { D, A } {}
    local Z = class 'Z' { K1, K2, K3 } {}
    
    pmro(Z)
    

output:

    <instance object><class object>
    <instance A><class A>
    <instance B><class B>
    <instance C><class C>
    echo A100
    echo B100
    echo C100
    C > B > A > object
    Z > K1 > K2 > K3 > D > object > B > C > E > object