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-- $Id: testes/closure.lua $

-- See Copyright Notice in file lua.h

global <const> *

print "testing closures"

do -- bug in 5.4.7

_ENV[true] = 10

local function aux () return _ENV[1 < 2] end

assert(aux() == 10)

_ENV[true] = nil

end

local A,B = 0,{g=10}

local function f(x)

local a = {}

for i=1,1000 do

local y = 0

do

a[i] = function () B.g = B.g+1; y = y+x; return y+A end

end

end

local dummy = function () return a[A] end

collectgarbage()

A = 1; assert(dummy() == a[1]); A = 0;

assert(a[1]() == x)

assert(a[3]() == x)

collectgarbage()

assert(B.g == 12)

return a

end

local a = f(10)

-- force a GC in this level

local x = {[1] = {}} -- to detect a GC

setmetatable(x, {__mode = 'kv'})

while x[1] do -- repeat until GC

local a = A..A..A..A -- create garbage

A = A+1

end

assert(a[1]() == 20+A)

assert(a[1]() == 30+A)

assert(a[2]() == 10+A)

collectgarbage()

assert(a[2]() == 20+A)

assert(a[2]() == 30+A)

assert(a[3]() == 20+A)

assert(a[8]() == 10+A)

assert(getmetatable(x).__mode == 'kv')

assert(B.g == 19)

-- testing equality

a = {}

for i = 1, 5 do a[i] = function (x) return i + a + _ENV end end

assert(a[3] ~= a[4] and a[4] ~= a[5])

do

local a = function (x) return math.sin(_ENV[x]) end

local function f()

return a

end

assert(f() == f())

end

-- testing closures with 'for' control variable

a = {}

for i=1,10 do

a[i] = function () return i end

if i == 3 then break end

end

assert(a[4] == undef)

assert(a[2]() == 2)

assert(a[3]() == 3)

a = {}

local t = {"a", "b"}

for i = 1, #t do

local k = t[i]

a[i] = {set = function(x) k=x end,

get = function () return i, k end}

if i == 2 then break end

end

a[1].set(10)

local r,s = a[2].get()

assert(r == 2 and s == 'b')

r,s = a[1].get()

assert(r == 1 and s == 10)

a[2].set('a')

r,s = a[2].get()

assert(r == 2 and s == "a")

-- testing closures with 'for' control variable x break

local f

for i=1,3 do

f = function () return i end

break

end

assert(f() == 1)

for k = 1, #t do

local v = t[k]

f = function () return k, v end

break

end

assert(({f()})[1] == 1)

assert(({f()})[2] == "a")

-- testing closure x break x return x errors

local b

function f(x)

local first = 1

while 1 do

if x == 3 and not first then return end

local a = 'xuxu'

b = function (op, y)

if op == 'set' then

a = x+y

else

return a

end

end

if x == 1 then do break end

elseif x == 2 then return

else if x ~= 3 then error() end

end

first = nil

end

end

for i=1,3 do

f(i)

assert(b('get') == 'xuxu')

b('set', 10); assert(b('get') == 10+i)

b = nil

end

pcall(f, 4);

assert(b('get') == 'xuxu')

b('set', 10); assert(b('get') == 14)

local y, w

-- testing multi-level closure

function f(x)

return function (y)

return function (z) return w+x+y+z end

end

end

y = f(10)

w = 1.345

assert(y(20)(30) == 60+w)

-- testing closures x break

do

local X, Y

local a = math.sin(0)

while a do

local b = 10

X = function () return b end -- closure with upvalue

if a then break end

end

do

local b = 20

Y = function () return b end -- closure with upvalue

end

-- upvalues must be different

assert(X() == 10 and Y() == 20)

end

-- testing closures x repeat-until

local a = {}

local i = 1

repeat

local x = i

a[i] = function () i = x+1; return x end

until i > 10 or a[i]() ~= x

assert(i == 11 and a[1]() == 1 and a[3]() == 3 and i == 4)

-- testing closures created in 'then' and 'else' parts of 'if's

a = {}

for i = 1, 10 do

if i % 3 == 0 then

local y = 0

a[i] = function (x) local t = y; y = x; return t end

elseif i % 3 == 1 then

goto L1

error'not here'

::L1::

local y = 1

a[i] = function (x) local t = y; y = x; return t end

elseif i % 3 == 2 then

local t

goto l4

::l4a:: a[i] = t; goto l4b

error("should never be here!")

::l4::

local y = 2

t = function (x) local t = y; y = x; return t end

goto l4a

error("should never be here!")

::l4b::

end

end

for i = 1, 10 do

assert(a[i](i * 10) == i % 3 and a[i]() == i * 10)

end

print'+'

-- test for correctly closing upvalues in tail calls of vararg functions

local function t ()

local function c(a,b) assert(a=="test" and b=="OK") end

local function v(f, ...) c("test", f() ~= 1 and "FAILED" or "OK") end

local x = 1

return v(function() return x end)

end

t()

-- test for debug manipulation of upvalues

local debug = require'debug'

local foo1, foo2, foo3

do

local a , b, c = 3, 5, 7

foo1 = function () return a+b end;

foo2 = function () return b+a end;

do

local a = 10

foo3 = function () return a+b end;

end

end

assert(debug.upvalueid(foo1, 1))

assert(debug.upvalueid(foo1, 2))

assert(not debug.upvalueid(foo1, 3))

assert(debug.upvalueid(foo1, 1) == debug.upvalueid(foo2, 2))

assert(debug.upvalueid(foo1, 2) == debug.upvalueid(foo2, 1))

assert(debug.upvalueid(foo3, 1))

assert(debug.upvalueid(foo1, 1) ~= debug.upvalueid(foo3, 1))

assert(debug.upvalueid(foo1, 2) == debug.upvalueid(foo3, 2))

assert(debug.upvalueid(string.gmatch("x", "x"), 1) ~= nil)

assert(foo1() == 3 + 5 and foo2() == 5 + 3)

debug.upvaluejoin(foo1, 2, foo2, 2)

assert(foo1() == 3 + 3 and foo2() == 5 + 3)

assert(foo3() == 10 + 5)

debug.upvaluejoin(foo3, 2, foo2, 1)

assert(foo3() == 10 + 5)

debug.upvaluejoin(foo3, 2, foo2, 2)

assert(foo3() == 10 + 3)

assert(not pcall(debug.upvaluejoin, foo1, 3, foo2, 1))

assert(not pcall(debug.upvaluejoin, foo1, 1, foo2, 3))

assert(not pcall(debug.upvaluejoin, foo1, 0, foo2, 1))

assert(not pcall(debug.upvaluejoin, print, 1, foo2, 1))

assert(not pcall(debug.upvaluejoin, {}, 1, foo2, 1))

assert(not pcall(debug.upvaluejoin, foo1, 1, print, 1))

print'OK'