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)
print('+')

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("�") > 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("�"), 0) == "\0�\0")
assert(string.char(string.byte("�l\0�u", 1, -1)) == "�l\0�u")
assert(string.char(string.byte("�l\0�u", 1, 0)) == "")
assert(string.char(string.byte("�l\0�u", -10, 100)) == "�l\0�u")
print('+')

assert(string.upper("ab\0c") == "AB\0C")
assert(string.lower("\0ABCc%$") == "\0abcc%$")
assert(string.rep('teste', 0) == '')
assert(string.rep('t�s\00t�', 2) == 't�s\0t�t�s\000t�')
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 = '"�lo"\n\\'
assert(string.format('%q%s', x, x) == '"\\"�lo\\"\\\n\\\\""�lo"\n\\')
assert(string.format('%q', "\0") == [["\000"]])
assert(string.format("\0%c\0%c%x\0", string.byte("�"), string.byte("b"), 140) ==
  "\0�\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--coment�rio 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" < "�lo" and "�lo" < "amo")
end

if not trylocale("ctype") then
  print("locale not supported")
else
  assert(string.gsub("�����", "%a", "x") == "xxxxx")
  assert(string.gsub("����", "%l", "x") == "x�x�")
  assert(string.gsub("����", "%u", "x") == "�x�x")
  assert(string.upper "���{xuxu}��o" == "���{XUXU}��O")
end

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

print('OK')