Difference between revisions of "Simple Educative Class Library"

m (Class keyword)
m (→‎See also: "SECS is now SECL")
 
(2 intermediate revisions by one other user not shown)
Line 1: Line 1:
−
Also known as SECS (pronounce as 'sex').
+
Also known as SECL.
 
This is a simple implementation of classes that works, it's not commented, so it's a nice test of your lua skills.
 
This is a simple implementation of classes that works, it's not commented, so it's a nice test of your lua skills.
  
−
Remember to check here once in a while, it might have updated.
+
The current version can always be found [https://github.com/bartbes/love-misc-libs in the love-misc-libs repository]
  
−
==Basic version==
+
==Basic version example==
−
<source lang="lua">
 
−
--[[
 
−
Copyright (c) 2009 Bart van Strien
 
−
 
 
−
Permission is hereby granted, free of charge, to any person
 
−
obtaining a copy of this software and associated documentation
 
−
files (the "Software"), to deal in the Software without
 
−
restriction, including without limitation the rights to use,
 
−
copy, modify, merge, publish, distribute, sublicense, and/or sell
 
−
copies of the Software, and to permit persons to whom the
 
−
Software is furnished to do so, subject to the following
 
−
conditions:
 
−
 
 
−
The above copyright notice and this permission notice shall be
 
−
included in all copies or substantial portions of the Software.
 
−
 
 
−
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 
−
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 
−
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 
−
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 
−
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 
−
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 
−
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 
−
OTHER DEALINGS IN THE SOFTWARE.
 
−
]]
 
−
 
 
−
__HAS_SECS_COMPATIBLE_CLASSES__ = true
 
−
 
 
−
local class_mt = {}
 
−
 
 
−
function class_mt:__index(key)
 
−
return self.__baseclass[key]
 
−
end
 
−
 
 
−
class = setmetatable({ __baseclass = {} }, class_mt)
 
−
 
 
−
function class:new(...)
 
−
local c = {}
 
−
c.__baseclass = self
 
−
setmetatable(c, getmetatable(self))
 
−
if c.init then
 
−
c:init(...)
 
−
end
 
−
return c
 
−
end
 
−
</source>
 
−
 
 
−
===Example===
 
 
<source lang="lua">
 
<source lang="lua">
 
require "class" --this assumes you've saved the code above in class.lua
 
require "class" --this assumes you've saved the code above in class.lua
Line 68: Line 20:
 
</source>
 
</source>
  
−
==Class Commons enabled basic version==
+
==Advanced version example==
−
<source lang="lua">
 
−
--[[
 
−
Copyright (c) 2009-2011 Bart van Strien
 
−
 
 
−
Permission is hereby granted, free of charge, to any person
 
−
obtaining a copy of this software and associated documentation
 
−
files (the "Software"), to deal in the Software without
 
−
restriction, including without limitation the rights to use,
 
−
copy, modify, merge, publish, distribute, sublicense, and/or sell
 
−
copies of the Software, and to permit persons to whom the
 
−
Software is furnished to do so, subject to the following
 
−
conditions:
 
−
 
 
−
The above copyright notice and this permission notice shall be
 
−
included in all copies or substantial portions of the Software.
 
−
 
 
−
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 
−
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 
−
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 
−
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 
−
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 
−
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 
−
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 
−
OTHER DEALINGS IN THE SOFTWARE.
 
−
]]
 
−
 
 
−
local class_mt = {}
 
−
 
 
−
function class_mt:__index(key)
 
−
    return self.__baseclass[key]
 
−
end
 
−
 
 
−
class = setmetatable({ __baseclass = {} }, class_mt)
 
−
 
 
−
function class:new(...)
 
−
    local c = {}
 
−
    c.__baseclass = self
 
−
    setmetatable(c, getmetatable(self))
 
−
    if c.init then
 
−
        c:init(...)
 
−
    end
 
−
    return c
 
−
end
 
−
 
 
−
if class_commons ~= false then --on by default
 
−
common = {}
 
−
 
 
−
function common.class(name, t, parent)
 
−
parent = parent or class
 
−
t.__baseclass = parent
 
−
return setmetatable(t, getmetatable(parent))
 
−
end
 
−
 
 
−
function common.instance(class, ...)
 
−
return class:new(...)
 
−
end
 
−
end
 
−
</source>
 
−
 
 
−
{{notice|It's likely versions below this are bugged. Sorry about that!}}
 
−
==Advanced version==
 
−
<source lang="lua">
 
−
--[[
 
−
Copyright (c) 2009 Bart van Strien
 
−
 
 
−
Permission is hereby granted, free of charge, to any person
 
−
obtaining a copy of this software and associated documentation
 
−
files (the "Software"), to deal in the Software without
 
−
restriction, including without limitation the rights to use,
 
−
copy, modify, merge, publish, distribute, sublicense, and/or sell
 
−
copies of the Software, and to permit persons to whom the
 
−
Software is furnished to do so, subject to the following
 
−
conditions:
 
−
 
 
−
The above copyright notice and this permission notice shall be
 
−
included in all copies or substantial portions of the Software.
 
−
 
 
−
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 
−
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 
−
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 
−
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 
−
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 
−
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 
−
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 
−
OTHER DEALINGS IN THE SOFTWARE.
 
−
]]
 
−
 
 
−
__HAS_SECS_COMPATIBLE_CLASSES__ = true
 
−
 
 
−
local class_mt = {}
 
−
 
 
−
function class_mt:__index(key)
 
−
if rawget(self, "__baseclass") then
 
−
return self.__baseclass[key]
 
−
end
 
−
return nil
 
−
end
 
−
 
 
−
class = setmetatable({ __baseclass = {} }, class_mt)
 
−
 
 
−
function class:new(...)
 
−
local c = {}
 
−
c.__baseclass = self
 
−
setmetatable(c, getmetatable(self))
 
−
if c.init then
 
−
c:init(...)
 
−
end
 
−
return c
 
−
end
 
−
 
 
−
function class:convert(t)
 
−
t.__baseclass = self
 
−
setmetatable(t, getmetatable(self))
 
−
return t
 
−
end
 
−
 
 
−
function class:addparent(...)
 
−
if not rawget(self.__baseclass, "__isparenttable") then
 
−
local t = {__isparenttable = true, self.__baseclass, ...}
 
−
local mt = {}
 
−
function mt:__index(key)
 
−
for i, v in pairs(self) do
 
−
if i ~= "__isparenttable" and v[key] then
 
−
return v[key]
 
−
end
 
−
end
 
−
return nil
 
−
end
 
−
self.__baseclass = setmetatable(t, mt)
 
−
else
 
−
for i, v in ipairs{...} do
 
−
table.insert(self.__baseclass, v)
 
−
end
 
−
end
 
−
return self
 
−
end
 
−
 
 
−
function class:setmetamethod(name, value)
 
−
local mt = getmetatable(self)
 
−
local newmt = {}
 
−
for i, v in pairs(mt) do
 
−
newmt[i] = v
 
−
end
 
−
newmt[name] = value
 
−
setmetatable(self, newmt)
 
−
end
 
−
</source>
 
−
 
 
−
===Example===
 
 
<source lang="lua">
 
<source lang="lua">
 
--NOTE: this example only contains features the basic version doesn't, if you want to see those functions see the basic example
 
--NOTE: this example only contains features the basic version doesn't, if you want to see those functions see the basic example
Line 246: Line 49:
 
</source>
 
</source>
  
−
==Full version (AKA overcomplicated)==
+
==Full version example==
−
<source lang="lua">
 
−
--[[
 
−
Copyright (c) 2009 Bart van Strien
 
−
 
 
−
Permission is hereby granted, free of charge, to any person
 
−
obtaining a copy of this software and associated documentation
 
−
files (the "Software"), to deal in the Software without
 
−
restriction, including without limitation the rights to use,
 
−
copy, modify, merge, publish, distribute, sublicense, and/or sell
 
−
copies of the Software, and to permit persons to whom the
 
−
Software is furnished to do so, subject to the following
 
−
conditions:
 
−
 
 
−
The above copyright notice and this permission notice shall be
 
−
included in all copies or substantial portions of the Software.
 
−
 
 
−
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 
−
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 
−
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 
−
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 
−
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 
−
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 
−
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 
−
OTHER DEALINGS IN THE SOFTWARE.
 
−
]]
 
−
 
 
−
__HAS_SECS_COMPATIBLE_CLASSES__ = true
 
−
 
 
−
local class_mt = {}
 
−
 
 
−
function class_mt:__index(key)
 
−
if rawget(self, "__baseclass") then
 
−
return self.__baseclass[key]
 
−
end
 
−
return nil
 
−
end
 
−
 
 
−
function class_mt:__call(...)
 
−
return self:new(...)
 
−
end
 
−
 
 
−
function class_mt:__add(parent)
 
−
return self:addparent(parent)
 
−
end
 
−
 
 
−
function class_mt:__eq(other)
 
−
if not other.__baseclass or other.__baseclass ~= self.__baseclass then return false end
 
−
for i, v in pairs(self) do
 
−
if not other[i] then
 
−
return false
 
−
end
 
−
end
 
−
for i, v in pairs(other) do
 
−
if not self[i] then
 
−
return false
 
−
end
 
−
end
 
−
return true
 
−
end
 
−
 
 
−
function class_mt:__lt(other)
 
−
if not other.__baseclass then return false end
 
−
if rawget(other.__baseclass, "__isparenttable") then
 
−
for i, v in pairs(other.__baseclass) do
 
−
if self == v or getmetatable(self).__lt(self, v) then return true end
 
−
end
 
−
else
 
−
if self == other.__baseclass or getmetatable(self).__lt(self, other.__baseclass) then return true end
 
−
end
 
−
return false
 
−
end
 
−
 
 
−
function class_mt:__le(other)
 
−
return (self < other or self == other)
 
−
end
 
−
 
 
−
local pt_mt = {}
 
−
function pt_mt:__index(key)
 
−
for i, v in pairs(self) do
 
−
if i ~= "__isparenttable" and v[key] then
 
−
return v[key]
 
−
end
 
−
end
 
−
return nil
 
−
end
 
−
 
 
−
class = setmetatable({ __baseclass = {} }, class_mt)
 
−
 
 
−
function class:new(...)
 
−
local c = {}
 
−
c.__baseclass = self
 
−
setmetatable(c, getmetatable(self))
 
−
if c.init then
 
−
c:init(...)
 
−
end
 
−
return c
 
−
end
 
−
 
 
−
function class:convert(t)
 
−
t.__baseclass = self
 
−
setmetatable(t, getmetatable(self))
 
−
return t
 
−
end
 
−
 
 
−
function class:addparent(...)
 
−
if not rawget(self.__baseclass, "__isparenttable") then
 
−
local t = {__isparenttable = true, self.__baseclass, ...}
 
−
self.__baseclass = setmetatable(t, pt_mt)
 
−
else
 
−
for i, v in ipairs{...} do
 
−
table.insert(self.__baseclass, v)
 
−
end
 
−
end
 
−
return self
 
−
end
 
−
 
 
−
function class:setmetamethod(name, value)
 
−
local mt = getmetatable(self)
 
−
local newmt = {}
 
−
for i, v in pairs(mt) do
 
−
newmt[i] = v
 
−
end
 
−
newmt[name] = value
 
−
setmetatable(self, newmt)
 
−
end
 
−
</source>
 
−
 
 
−
 
 
−
===Example===
 
 
<source lang="lua">
 
<source lang="lua">
 
--NOTE: This example only contains features the advanced version doesn't have
 
--NOTE: This example only contains features the advanced version doesn't have
Line 404: Line 78:
 
</source>
 
</source>
  
−
==Revised version==
+
==Revised version example ==
−
Warning, this might update more than the others.
 
−
<source lang="lua">
 
−
--[[
 
−
Copyright (c) 2010 Bart van Strien
 
−
 
 
−
Permission is hereby granted, free of charge, to any person
 
−
obtaining a copy of this software and associated documentation
 
−
files (the "Software"), to deal in the Software without
 
−
restriction, including without limitation the rights to use,
 
−
copy, modify, merge, publish, distribute, sublicense, and/or sell
 
−
copies of the Software, and to permit persons to whom the
 
−
Software is furnished to do so, subject to the following
 
−
conditions:
 
−
 
 
−
The above copyright notice and this permission notice shall be
 
−
included in all copies or substantial portions of the Software.
 
−
 
 
−
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 
−
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 
−
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 
−
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 
−
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 
−
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 
−
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 
−
OTHER DEALINGS IN THE SOFTWARE.
 
−
]]
 
−
 
 
−
__HAS_SECS_COMPATIBLE_CLASSES__ = true
 
−
 
 
−
local class_mt = {}
 
−
 
 
−
function class_mt:__index(key)
 
−
if key == "__private" or (rawget(self, "__private") and self.__private[key]) then
 
−
return nil
 
−
end
 
−
if rawget(self, "__baseclass") then
 
−
return self.__baseclass[key]
 
−
end
 
−
return nil
 
−
end
 
−
 
 
−
function class_mt:__call(...)
 
−
return self:new(...)
 
−
end
 
−
 
 
−
function class_mt:__add(parent)
 
−
return self:addparent(parent)
 
−
end
 
−
 
 
−
function class_mt:__eq(other)
 
−
if not other.__baseclass or other.__baseclass ~= self.__baseclass then return false end
 
−
for i, v in pairs(self) do
 
−
if not other[i] then
 
−
return false
 
−
end
 
−
end
 
−
for i, v in pairs(other) do
 
−
if not self[i] then
 
−
return false
 
−
end
 
−
end
 
−
return true
 
−
end
 
−
 
 
−
function class_mt:__lt(other)
 
−
if not other.__baseclass then return false end
 
−
if rawget(other.__baseclass, "__isparenttable") then
 
−
for i, v in pairs(other.__baseclass) do
 
−
if self == v or getmetatable(self).__lt(self, v) then return true end
 
−
end
 
−
else
 
−
if self == other.__baseclass or getmetatable(self).__lt(self, other.__baseclass) then return true end
 
−
end
 
−
return false
 
−
end
 
−
 
 
−
function class_mt:__le(other)
 
−
return (self < other or self == other)
 
−
end
 
−
 
 
−
local pt_mt = {}
 
−
function pt_mt:__index(key)
 
−
for i, v in pairs(self) do
 
−
if i ~= "__isparenttable" and v[key] then
 
−
return v[key]
 
−
end
 
−
end
 
−
return nil
 
−
end
 
−
 
 
−
class = setmetatable({ __baseclass = {} }, class_mt)
 
−
 
 
−
function class:new(...)
 
−
local c = {}
 
−
c.__baseclass = self
 
−
setmetatable(c, getmetatable(self))
 
−
c:__init(...)
 
−
return c
 
−
end
 
−
 
 
−
function class:__init(...)
 
−
local args = {...}
 
−
if rawget(self, "init") then
 
−
args = {self:init(...) or ...}
 
−
end
 
−
if self.__baseclass.__init then
 
−
self.__baseclass:__init(unpack(args))
 
−
end
 
−
end
 
−
 
 
−
function class:convert(t)
 
−
t.__baseclass = self
 
−
setmetatable(t, getmetatable(self))
 
−
return t
 
−
end
 
−
 
 
−
function class:addparent(...)
 
−
if not rawget(self.__baseclass, "__isparenttable") then
 
−
local t = {__isparenttable = true, self.__baseclass, ...}
 
−
self.__baseclass = setmetatable(t, pt_mt)
 
−
else
 
−
for i, v in ipairs{...} do
 
−
table.insert(self.__baseclass, v)
 
−
end
 
−
end
 
−
return self
 
−
end
 
−
 
 
−
function class:setmetamethod(name, value)
 
−
local mt = getmetatable(self)
 
−
local newmt = {}
 
−
for i, v in pairs(mt) do
 
−
newmt[i] = v
 
−
end
 
−
newmt[name] = value
 
−
setmetatable(self, newmt)
 
−
end
 
−
</source>
 
−
 
 
−
===Example===
 
 
Same as full.
 
Same as full.
  
 
==See also==
 
==See also==
−
[[User:Bartbes|Bartbes]], creator and maintainer of SECS.
+
[[User:Bartbes|Bartbes]], creator and maintainer of SECL.
  
 
{{#set:LOVE Version=Any}}
 
{{#set:LOVE Version=Any}}

Latest revision as of 12:04, 16 August 2015

Also known as SECL. This is a simple implementation of classes that works, it's not commented, so it's a nice test of your lua skills.

The current version can always be found in the love-misc-libs repository

Basic version example

require "class" --this assumes you've saved the code above in class.lua

myclass = class:new()
myclass.value = 13
function myclass:setvalue(v)
    self.value = v
end
object = myclass:new()
object:setvalue(128)
--myclass.value is still 13 and object.value is now 128
anotherObject = object:new()
--anotherObject.value is 128

Advanced version example

--NOTE: this example only contains features the basic version doesn't, if you want to see those functions see the basic example
--require it here

--create the tables/classes
cl1 = class:new()
cl2 = class:new()
cl3 = {}

--fill the tables/classes
cl1.val1 = 12
cl2.val2 = 24
cl3.val3 = 48

--create the new merged class
merged = cl1:new()
print(merged.val1, merged.val2, merged.val3) --> 12  nil  nil
merged:addparent(cl2)
print(merged.val1, merged.val2, merged.val3) --> 12  24  nil
--remember cl3 is a normal table, not a class?
class:convert(cl3) --converts the table in place and returns it, so you can use it in expressions
merged:addparent(cl3) --could also be merged:addparent(class:convert(cl3))
print(merged.val1, merged.val2, merged.val3) --> 12  24  48

--convert is part of any class, the parent of the converted class is the class where convert is called from
--NOTE: addparent supports multiple parents at once, the way that it's done here is to serve as an example

Full version example

--NOTE: This example only contains features the advanced version doesn't have
--require it here

cl1 = class() --new is implied
cl2 = class()

cl1.val1 = 12
cl2.val2 = 24

merged = cl1() + cl2 --yes, we can just add cl2 as if we were doing math
print(merged.val1, merged.val2) --> 12  24

if merged > cl1 then
    print("Merged is a derivative of cl1") --which it is, so this is printed
end
if merged > cl2 then
    print("Merged is a derivative of cl2") --it's that as well, so print
end

merged2 = cl1() + cl2  --create another derivative with the same parents
merged2.val1 = 36  --we change one value

if merged == merged2 then
    print("Merged2 is of the same type as merged") --they are the same type, note this only works when changing, when you add or remove values it is considered as a new class
end

Revised version example

Same as full.

See also

Bartbes, creator and maintainer of SECL.

Retrieved from "https://love2d.org./w/index.php?title=Simple_Educative_Class_Library&oldid=15223"