OpenEuphoria

1. [OE] Suggestion for OpenEuphoria 'Next' | Module

• Posted by mitgedanken Feb 25, 2021
• 1013 views
• Last edited Nov 07, 2022

Forked from Alternative: Module -- Re: fake class in OE

An alternative to "class"

For short

1. a module is like a namespace and like a routine
   1. but module must be instanciated
   2. and needs a procedure "new"
   3. "Module.routine(..)" and "Module.var" if it's export/public or have a "get_var" or "set_var" (both or one of them)
2. only anything above "module" will be usable if only namespace is used

Accessing routines and public/exported variables and constants

Internal

1. routine => self.routinename() ( or routinename() / .routinename() )
2. var/const => self#varname / self#constname ( or #varname / #constname )
3. constants alternative => self##constname ( optional )

External

1. routine => modulename.routinename
2. var/const => modulename#varname / modulename#constname (or modulename##constname)

namespace module_animal -- still optional 
 
-- "export module" is equal to "export function/procedure" 
export module Animal is Class  -- or as above, but I think, that's better then Animal : Class (it seems like a namespace) 
-- a module does NOT inheritance from Class automaticly! 
-- Class is more like a struct/type 
 
-- anything like above 

-- "public module" is equal to "public function/procedure" 
public module Cow is Animal 
use mymods/Animal.em -- .em Euphoria Module -- a Module could be self executable but I think it must not. 
-- 'use' could be before 'module'  
-- […] 

The Horns Example (simple)

namespace module_cow 
 
public module Cow is Animal 
use mymods/Animal.em 
 
integer horns 
sequence name 
 
-- procedure new() is required for any (instancible) module! 
export procedure new(sequence name, integer horns = 2) 
  #name = name 
  #horns = horns 
export procedure 
 
export procedure rename(sequence name) 
  #name = name 
end procedure 
 
export function get_horns() 
  return #horns 
end function 
 
export procedure set_horns(integer amount) 
  #horns = amount 
end procedure 

use mymods/Cow.em 
 
my_cow = Cow() 
? my_cow#name  -- "Luisa" 
? my_cow#horns -- 2 
 
your_cow = Cow("Priceless", 3) 
? your_cow#name  -- "Priceless" 
? your_cow#horns -- 3 
 
your_cow#horns = 0 
your_cow.rename("Princess") 
? your_cow#horns -- 0 
? your:cow#name  -- "Princess" 

my_cow = Cow() 
your_cow = Cow() 
? equal(my_cow, your_cow) -- 0 

Comparing modules

Rules

Equality

1. It is the same class/module.
2. An .equal function is defined and it return 1 (true)

Example 1

instance classA = new ClassA() 
instance classB = new ClassB() 

Example 2

export module ClassC is class 
 
integer ii = 1 
 
export new() 
… 
end new 
 
export equal(instance q, instance p) 
   return equal(q.ii, p.ii) 
end equal 
 
… 

export module ClassD is class 
 
integer ii = 1 
 
export new() 
… 
end new 
 
export equal(instance q, instance p) 
   return equal(q.ii, p.ii) 
end equal 
 
…