github.com/xrash/gopher-lua@v0.0.0-20160304065408-e5faab4db06a/_lua5.1-tests/strings.lua

print('testing strings and string library')

assert('alo' < 'alo1')
assert('' < 'a')
assert('alo\0alo' < 'alo\0b')
assert('alo\0alo\0\0' > 'alo\0alo\0')
assert('alo' < 'alo\0')
assert('alo\0' > 'alo')
assert('\0' < '\1')
assert('\0\0' < '\0\1')
assert('\1\0a\0a' <= '\1\0a\0a')
assert(not ('\1\0a\0b' <= '\1\0a\0a'))
assert('\0\0\0' < '\0\0\0\0')
assert(not('\0\0\0\0' < '\0\0\0'))
assert('\0\0\0' <= '\0\0\0\0')
assert(not('\0\0\0\0' <= '\0\0\0'))
assert('\0\0\0' <= '\0\0\0')
assert('\0\0\0' >= '\0\0\0')
assert(not ('\0\0b' < '\0\0a\0'))
print('+')
assert(string.sub("123456789",2,4) == "234")
assert(string.sub("123456789",7) == "789")
assert(string.sub("123456789",7,6) == "")
assert(string.sub("123456789",7,7) == "7")
assert(string.sub("123456789",0,0) == "")
assert(string.sub("123456789",-10,10) == "123456789")
assert(string.sub("123456789",1,9) == "123456789")
assert(string.sub("123456789",-10,-20) == "")
assert(string.sub("123456789",-1) == "9")
assert(string.sub("123456789",-4) == "6789")
assert(string.sub("123456789",-6, -4) == "456")
assert(string.sub("\000123456789",3,5) == "234")
assert(("\000123456789"):sub(8) == "789")
print('+')

assert(string.find("123456789", "345") == 3)
a,b = string.find("123456789", "345")
assert(string.sub("123456789", a, b) == "345")
assert(string.find("1234567890123456789", "345", 3) == 3)
assert(string.find("1234567890123456789", "345", 4) == 13)
assert(string.find("1234567890123456789", "346", 4) == nil)
assert(string.find("1234567890123456789", ".45", -9) == 13)
assert(string.find("abcdefg", "\0", 5, 1) == nil)
assert(string.find("", "") == 1)
assert(string.find('', 'aaa', 1) == nil)
assert(('alo(.)alo'):find('(.)', 1, 1) == 4)

assert(string.len("") == 0)
assert(string.len("\0\0\0") == 3)
assert(string.len("1234567890") == 10)

assert(#"" == 0)
assert(#"\0\0\0" == 3)
assert(#"1234567890" == 10)

assert(string.byte("a") == 97)
assert(string.byte("á") > 127)
assert(string.byte(string.char(255)) == 255)
assert(string.byte(string.char(0)) == 0)
assert(string.byte("\0") == 0)
assert(string.byte("\0\0alo\0x", -1) == string.byte('x'))
assert(string.byte("ba", 2) == 97)
assert(string.byte("\n\n", 2, -1) == 10)
assert(string.byte("\n\n", 2, 2) == 10)
assert(string.byte("") == nil)
assert(string.byte("hi", -3) == nil)
assert(string.byte("hi", 3) == nil)
assert(string.byte("hi", 9, 10) == nil)
assert(string.byte("hi", 2, 1) == nil)
assert(string.char() == "")
assert(string.char(0, 255, 0) == "\0\255\0")
assert(string.char(0, string.byte("á"), 0) == "\0á\0")
assert(string.char(string.byte("ál\0óu", 1, -1)) == "ál\0óu")
assert(string.char(string.byte("ál\0óu", 1, 0)) == "")
assert(string.char(string.byte("ál\0óu", -10, 100)) == "ál\0óu")
print('+')

assert(string.upper("ab\0c") == "AB\0C")
assert(string.lower("\0ABCc%$") == "\0abcc%$")
assert(string.rep('teste', 0) == '')
assert(string.rep('tés\00tê', 2) == 'tés\0têtés\000tê')
assert(string.rep('', 10) == '')

assert(string.reverse"" == "")
assert(string.reverse"\0\1\2\3" == "\3\2\1\0")
assert(string.reverse"\0001234" == "4321\0")

for i=0,30 do assert(string.len(string.rep('a', i)) == i) end

assert(type(tostring(nil)) == 'string')
assert(type(tostring(12)) == 'string')
assert(''..12 == '12' and type(12 .. '') == 'string')
assert(string.find(tostring{}, 'table:'))
assert(string.find(tostring(print), 'function:'))
assert(tostring(1234567890123) == '1234567890123')
assert(#tostring('\0') == 1)
assert(tostring(true) == "true")
assert(tostring(false) == "false")
print('+')

x = '"ílo"\n\\'
-- assert(string.format('%q%s', x, x) == '"\\"ílo\\"\\\n\\\\""ílo"\n\\')
-- assert(string.format('%q', "\0") == [["\000"]])
--assert(string.format("\0%c\0%c%x\0", string.byte("á"), string.byte("b"), 140) ==
--              "\0á\0b8c\0")
assert(string.format('') == "")
assert(string.format("%c",34)..string.format("%c",48)..string.format("%c",90)..string.format("%c",100) ==
       string.format("%c%c%c%c", 34, 48, 90, 100))
assert(string.format("%s\0 is not \0%s", 'not be', 'be') == 'not be\0 is not \0be')
assert(string.format("%%%d %010d", 10, 23) == "%10 0000000023")
assert(tonumber(string.format("%f", 10.3)) == 10.3)
x = string.format('"%-50s"', 'a')
assert(#x == 52)
assert(string.sub(x, 1, 4) == '"a  ')

assert(string.format("-%.20s.20s", string.rep("%", 2000)) == "-"..string.rep("%", 20)..".20s")
assert(string.format('"-%20s.20s"', string.rep("%", 2000)) ==
       string.format("%q", "-"..string.rep("%", 2000)..".20s"))


-- longest number that can be formated
assert(string.len(string.format('%99.99f', -1e308)) >= 100)

-- assert(loadstring("return 1\n--comentário sem EOL no final")() == 1)

assert(table.concat{} == "")
assert(table.concat({}, 'x') == "")
assert(table.concat({'\0', '\0\1', '\0\1\2'}, '.\0.') == "\0.\0.\0\1.\0.\0\1\2")
local a = {}; for i=1,3000 do a[i] = "xuxu" end
assert(table.concat(a, "123").."123" == string.rep("xuxu123", 3000))
assert(table.concat(a, "b", 20, 20) == "xuxu")
assert(table.concat(a, "", 20, 21) == "xuxuxuxu")
assert(table.concat(a, "", 22, 21) == "")
assert(table.concat(a, "3", 2999) == "xuxu3xuxu")

a = {"a","b","c"}
assert(table.concat(a, ",", 1, 0) == "")
assert(table.concat(a, ",", 1, 1) == "a")
assert(table.concat(a, ",", 1, 2) == "a,b")
assert(table.concat(a, ",", 2) == "b,c")
assert(table.concat(a, ",", 3) == "c")
assert(table.concat(a, ",", 4) == "")

local locales = { "ptb", "ISO-8859-1", "pt_BR" }
local function trylocale (w)
  for _, l in ipairs(locales) do
    if os.setlocale(l, w) then return true end
  end
  return false
end

if not trylocale("collate")  then
  print("locale not supported")
else
  assert("alo" < "álo" and "álo" < "amo")
end

if not trylocale("ctype") then
  print("locale not supported")
else
  assert(string.gsub("áéíóú", "%a", "x") == "xxxxx")
  assert(string.gsub("áÁéÉ", "%l", "x") == "xÁxÉ")
  assert(string.gsub("áÁéÉ", "%u", "x") == "áxéx")
  assert(string.upper"áÁé{xuxu}ção" == "ÁÁÉ{XUXU}ÇÃO")
end

-- os.setlocale("C")
-- assert(os.setlocale() == 'C')
-- assert(os.setlocale(nil, "numeric") == 'C')

print('OK')