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152 lines
3.3 KiB
152 lines
3.3 KiB
-- $Id: vararg.lua,v 1.25 2016/11/07 13:11:28 roberto Exp $
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-- See Copyright Notice in file all.lua
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print('testing vararg')
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function f(a, ...)
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local arg = {n = select('#', ...), ...}
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for i=1,arg.n do assert(a[i]==arg[i]) end
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return arg.n
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end
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function c12 (...)
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assert(arg == _G.arg) -- no local 'arg'
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local x = {...}; x.n = #x
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local res = (x.n==2 and x[1] == 1 and x[2] == 2)
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if res then res = 55 end
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return res, 2
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end
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function vararg (...) return {n = select('#', ...), ...} end
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local call = function (f, args) return f(table.unpack(args, 1, args.n)) end
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assert(f() == 0)
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assert(f({1,2,3}, 1, 2, 3) == 3)
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assert(f({"alo", nil, 45, f, nil}, "alo", nil, 45, f, nil) == 5)
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assert(vararg().n == 0)
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assert(vararg(nil, nil).n == 2)
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assert(c12(1,2)==55)
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a,b = assert(call(c12, {1,2}))
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assert(a == 55 and b == 2)
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a = call(c12, {1,2;n=2})
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assert(a == 55 and b == 2)
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a = call(c12, {1,2;n=1})
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assert(not a)
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assert(c12(1,2,3) == false)
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local a = vararg(call(next, {_G,nil;n=2}))
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local b,c = next(_G)
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assert(a[1] == b and a[2] == c and a.n == 2)
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a = vararg(call(call, {c12, {1,2}}))
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assert(a.n == 2 and a[1] == 55 and a[2] == 2)
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a = call(print, {'+'})
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assert(a == nil)
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local t = {1, 10}
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function t:f (...) local arg = {...}; return self[...]+#arg end
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assert(t:f(1,4) == 3 and t:f(2) == 11)
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print('+')
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lim = 20
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local i, a = 1, {}
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while i <= lim do a[i] = i+0.3; i=i+1 end
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function f(a, b, c, d, ...)
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local more = {...}
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assert(a == 1.3 and more[1] == 5.3 and
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more[lim-4] == lim+0.3 and not more[lim-3])
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end
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function g(a,b,c)
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assert(a == 1.3 and b == 2.3 and c == 3.3)
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end
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call(f, a)
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call(g, a)
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a = {}
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i = 1
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while i <= lim do a[i] = i; i=i+1 end
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assert(call(math.max, a) == lim)
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print("+")
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-- new-style varargs
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function oneless (a, ...) return ... end
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function f (n, a, ...)
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local b
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assert(arg == _G.arg) -- no local 'arg'
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if n == 0 then
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local b, c, d = ...
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return a, b, c, d, oneless(oneless(oneless(...)))
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else
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n, b, a = n-1, ..., a
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assert(b == ...)
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return f(n, a, ...)
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end
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end
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a,b,c,d,e = assert(f(10,5,4,3,2,1))
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assert(a==5 and b==4 and c==3 and d==2 and e==1)
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a,b,c,d,e = f(4)
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assert(a==nil and b==nil and c==nil and d==nil and e==nil)
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-- varargs for main chunks
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f = load[[ return {...} ]]
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x = f(2,3)
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assert(x[1] == 2 and x[2] == 3 and x[3] == nil)
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f = load[[
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local x = {...}
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for i=1,select('#', ...) do assert(x[i] == select(i, ...)) end
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assert(x[select('#', ...)+1] == nil)
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return true
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]]
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assert(f("a", "b", nil, {}, assert))
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assert(f())
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a = {select(3, table.unpack{10,20,30,40})}
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assert(#a == 2 and a[1] == 30 and a[2] == 40)
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a = {select(1)}
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assert(next(a) == nil)
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a = {select(-1, 3, 5, 7)}
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assert(a[1] == 7 and a[2] == nil)
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a = {select(-2, 3, 5, 7)}
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assert(a[1] == 5 and a[2] == 7 and a[3] == nil)
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pcall(select, 10000)
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pcall(select, -10000)
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-- bug in 5.2.2
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function f(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10,
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p11, p12, p13, p14, p15, p16, p17, p18, p19, p20,
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p21, p22, p23, p24, p25, p26, p27, p28, p29, p30,
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p31, p32, p33, p34, p35, p36, p37, p38, p39, p40,
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p41, p42, p43, p44, p45, p46, p48, p49, p50, ...)
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local a1,a2,a3,a4,a5,a6,a7
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local a8,a9,a10,a11,a12,a13,a14
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end
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-- assertion fail here
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f()
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-- missing arguments in tail call
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do
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local function f(a,b,c) return c, b end
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local function g() return f(1,2) end
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local a, b = g()
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assert(a == nil and b == 2)
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end
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print('OK')
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