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-- $Id: testes/vararg.lua $
-- See Copyright Notice in file lua.h
print('testing vararg')
local function f (a, ...)
local x = {n = select('#', ...), ...}
for i = 1, x.n do assert(a[i] == x[i]) end
return x.n
end
local function c12 (...)
assert(arg == _G.arg) -- no local 'arg'
local x = {...}; x.n = #x
local res = (x.n==2 and x[1] == 1 and x[2] == 2)
if res then res = 55 end
return res, 2
end
local function vararg (...) return {n = select('#', ...), ...} end
local call = function (f, args) return f(table.unpack(args, 1, args.n)) end
assert(f() == 0)
assert(f({1,2,3}, 1, 2, 3) == 3)
assert(f({"alo", nil, 45, f, nil}, "alo", nil, 45, f, nil) == 5)
assert(vararg().n == 0)
assert(vararg(nil, nil).n == 2)
assert(c12(1,2)==55)
local a,b = assert(call(c12, {1,2}))
assert(a == 55 and b == 2)
a = call(c12, {1,2;n=2})
assert(a == 55 and b == 2)
a = call(c12, {1,2;n=1})
assert(not a)
assert(c12(1,2,3) == false)
local a = vararg(call(next, {_G,nil;n=2}))
local b,c = next(_G)
assert(a[1] == b and a[2] == c and a.n == 2)
a = vararg(call(call, {c12, {1,2}}))
assert(a.n == 2 and a[1] == 55 and a[2] == 2)
a = call(print, {'+'})
assert(a == nil)
local t = {1, 10}
function t:f (...) local arg = {...}; return self[...]+#arg end
assert(t:f(1,4) == 3 and t:f(2) == 11)
print('+')
local lim = 20
local i, a = 1, {}
while i <= lim do a[i] = i+0.3; i=i+1 end
function f(a, b, c, d, ...)
local more = {...}
assert(a == 1.3 and more[1] == 5.3 and
more[lim-4] == lim+0.3 and not more[lim-3])
end
local function g (a,b,c)
assert(a == 1.3 and b == 2.3 and c == 3.3)
end
call(f, a)
call(g, a)
a = {}
i = 1
while i <= lim do a[i] = i; i=i+1 end
assert(call(math.max, a) == lim)
print("+")
-- new-style varargs
local function oneless (a, ...) return ... end
function f (n, a, ...)
local b
assert(arg == _G.arg) -- no local 'arg'
if n == 0 then
local b, c, d = ...
return a, b, c, d, oneless(oneless(oneless(...)))
else
n, b, a = n-1, ..., a
assert(b == ...)
return f(n, a, ...)
end
end
a,b,c,d,e = assert(f(10,5,4,3,2,1))
assert(a==5 and b==4 and c==3 and d==2 and e==1)
a,b,c,d,e = f(4)
assert(a==nil and b==nil and c==nil and d==nil and e==nil)
-- varargs for main chunks
local f = load[[ return {...} ]]
local x = f(2,3)
assert(x[1] == 2 and x[2] == 3 and x[3] == undef)
f = load[[
local x = {...}
for i=1,select('#', ...) do assert(x[i] == select(i, ...)) end
assert(x[select('#', ...)+1] == undef)
return true
]]
assert(f("a", "b", nil, {}, assert))
assert(f())
a = {select(3, table.unpack{10,20,30,40})}
assert(#a == 2 and a[1] == 30 and a[2] == 40)
a = {select(1)}
assert(next(a) == nil)
a = {select(-1, 3, 5, 7)}
assert(a[1] == 7 and a[2] == undef)
a = {select(-2, 3, 5, 7)}
assert(a[1] == 5 and a[2] == 7 and a[3] == undef)
pcall(select, 10000)
pcall(select, -10000)
-- bug in 5.2.2
function f(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10,
p11, p12, p13, p14, p15, p16, p17, p18, p19, p20,
p21, p22, p23, p24, p25, p26, p27, p28, p29, p30,
p31, p32, p33, p34, p35, p36, p37, p38, p39, p40,
p41, p42, p43, p44, p45, p46, p48, p49, p50, ...)
local a1,a2,a3,a4,a5,a6,a7
local a8,a9,a10,a11,a12,a13,a14
end
-- assertion fail here
f()
-- missing arguments in tail call
do
local function f(a,b,c) return c, b end
local function g() return f(1,2) end
local a, b = g()
assert(a == nil and b == 2)
end
print('OK')
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