classlib/multiple.lua at master · LuaDist/classlib · GitHub

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-- shared_meters = true

keep_ambiguous = true

require 'unclasslib'

function say(msg) print(msg and "> " .. msg or "") end

print [[
> meter = class()
> function meter:__init(value)
>	print("meter init " .. (value or 'nil'))
>	self.value = value or 0
> end
> function meter:set(value)
>	self.value = value
> end
> function meter:read()
> 	print("meter read " .. self.value)
> 	return self.value
> end
> function meter:which()
> 	print("meter = " .. tostring(self) ..  " { value = " .. self.value .. " }")
> end
> meter.value = -1
]]

meter = class()
function meter:__init(value)
	print("meter init " .. (value or 'nil'))
	self.value = value or 0
end
function meter:set(value)
	self.value = value
end
function meter:read()
	print("meter read " .. self.value)
	return self.value
end
function meter:which()
	print("meter = " .. tostring(self) ..  " { value = " .. self.value .. " }")
end
meter.value = -1

m = shared_meters and shared(meter) or meter
mm = shared_meters and "shared(meter)" or "meter"

say("hygro = class(" .. mm .. ")")
hygro = class(m)

print [[
> function hygro:read()
> 	print("humidity " .. self[meter].value)
> end
]]

function hygro:read()
	print("humidity " .. self[meter].value)
end

say("therm = class(" .. mm .. ")")
therm = class(m)

print [[
> function therm:read()
> 	print("temperature " .. self[meter].value)
> end
]]

function therm:read()
	print("temperature " .. self[meter].value)
end

print [[
> hygrotherm = class(hygro, therm)
> function hygrotherm:read()
> 	self[hygro]:read()
> 	self[therm]:read()
> end
]]

hygrotherm = class(hygro, therm)
function hygrotherm:read()
	self[hygro]:read()
	self[therm]:read()
end

say('ht = hygrotherm(0)')
ht = hygrotherm(0)

say()
say("ht[therm]:set(11)")

ht[therm]:set(11)

say("ht[therm]:read()")

ht[therm]:read()

say()
say("ht[hygro]:set(22)")

ht[hygro]:set(22)

say("ht[hygro]:read()")

ht[hygro]:read()

say()
say("ht[therm]:read()")

ht[therm]:read()

say()
say("ht:read()")

ht:read()

say()
say("ht:which()")

status, msg = pcall(ht.which, ht)
if not status then print(msg) end

function show(t)
	if not t or not t.__type then print("Sorry, cannot show " .. tostring(t)) return end
	print('__type', t.__type)
	for i, v in pairs(t) do
		if type(i) ~= 'string' or i:sub(1, 2) ~= '__' then print(i, v) end
	end
end

print()
print("Class attributes:")
print()
print('meter:') show(meter)
print()
print('therm:') show(therm)
print()
print('hygro:') show(hygro)
print()
print('hygrotherm:') show(hygrotherm)
print()
print("ht is a meter = ", ht:is_a(meter))
print("ht is a therm = ", ht:is_a(therm))
print("ht is a hygro = ", ht:is_a(hygro))
print("ht is a hygrotherm = ", ht:is_a(hygrotherm))


print()
print("Object attributes:")
print()
print("ht:") show(ht)
print()
print("ht[hygro]:") show(ht[hygro])
print()
print("ht[therm]:") show(ht[therm])
print()
print("ht[hygro][meter]:") show(ht[hygro][meter])
print()
print("ht[therm][meter]:") show(ht[therm][meter])
print()
print("ht[meter]:")

status, msg = pcall(show, ht[meter])
if not status then print(msg)end