Get all subclasses?

Questions
1

I’m back fiddling with Codea after a long time plowing other fields. Thought I would again try to build a little unit testing framework. I was planning to emulate the java and c# ones, where you subclass e.g. TestCase, and the the framework runs all the test methods in your class.

So one question is, how can I get all the classes that are subclasses of TestCase?

Another question, as always, is whether I’m on the wrong track and should approach it another way.

Thanks,

Ron

2

Let me write up a quick example.

3

I just finished writing the code, when I noticed I might have misunderstood your question. Anyways, here’s some code to find all the functions in a class:

--# Main
function setup()
    local subclasses = {}
    for i,v in pairs(TestCase) do
        if type(v) == "function" then
            table.insert(subclasses,{i,v})
        end
    end
    for i,v in ipairs(subclasses) do
        print("Function "..i..": "..v[1])
    end
end

--# TestCase
TestCase = class()

function TestCase:init()
end

function TestCase:draw()
end

function TestCase:func1()
end

function TestCase:func2()
end

function TestCase:func3()
end

If you meant something else, please let me know.
Thanks!
Edit: I did misunderstand your question. Let me see if I can find a way.

4 
function setup()
   class = TestCase()
end

function draw()
  class:init()
  class:draw()
  class:function1()
end

TestCase = class()

function TestCase:init()
    
end
function TestCase:draw()
 
end 

function TestCase:function1()
    
end
5

I do not know if you mean that

6

@Luismi - What he means is he wants to find all the classes the inherit a specific class. You might try giving the parent class a unique identifier that the children inherit, then you go through each class and see if it has that unique identifier. Other than that, I can’t find a clear way.
Thanks!

7

Ops @Zoyt . My apologies , really is that I did not understand the question very well

8

@Luismi - No worries. I didn’t either at first (I had to Google it).

9

@RonJeffries is this what you are looking for?

-- SubClasses

-- Use this function to perform your initial setup
function setup()
    s = subclasses(Animal)
    print("subclasses of class Animal:\
")
    for k, v in pairs(s) do print(k .. " says " .. v:say()) end
end

-- This function gets called once every frame
function draw()
    
end

function subclasses(c)
    local t = {}
    for k, v in pairs(_G) do
        if type(v) == "table" and v._base and v._base == c then
            t[k] = v
        end
    end
    return t
end

Animal = class()

function Animal:say()
    return self.sound
end

Dog = class(Animal)

Dog.sound = "Woof"

Cat = class(Animal)

Cat.sound = "Meow"

Fox = class(Animal)

Fox.sound = "???"
10

All, thanks!

Zoyt, your example shows me that what I’m doing to find the test methods may not be far off.

Jordan, the v._base thing looks to be just what I’m looking for. It seems to find immediate subclasses, which is fine, prob forever. Otherwise I guess I could search recursively, but I see no real need to go there.

Luismi, I apologize that I wasn’t clear. Thanks, all.

R

11

Ok, that nearly worked. I think it’s “base”, not “_base”, and I have some other issues, but am an inch further along. Thanks again…

R

12

@Jordan - =)) I see what you did there.

13

Am I missing something with the base / _base thing? The tables for classes sure seem to me to say base, but the docs all say _base.

Thanks,

R

14

@Zoyt, @Jordan, What does the Fox say? That’s a classic :))

15

@RonJeffries - http://www.youtube.com/watch?v=jofNR_WkoCE
Here is most likely your reaction when you see it:
No sign of life

16

@Zoyt Yet again, I can only apologise on behalf of the Norwegians for releasing that to the world …

17

I Love That Song!!!

18

Foxes yip or bark or something, don’t they?

If they don’t yip or bark or something, I really wanna know, what does the fox say?

19

@SkyTheCoder We should probably get back on topic, but foxes make a variety of sounds, excluding yipping and barking.