-- $Id: strings.lua,v 1.86 2016/11/07 13:11:28 roberto Exp roberto $
-- See Copyright Notice in file all.lua

print('testing strings and string library')

local maxi, mini = math.maxinteger, math.mininteger


local function checkerror (msg, f, ...)
  local s, err = pcall(f, ...)
  assert(not s and string.find(err, msg))
end


-- testing string comparisons
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'))

-- testing string.sub
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("123456789", mini, -4) == "123456")
assert(string.sub("123456789", mini, maxi) == "123456789")
assert(string.sub("123456789", mini, mini) == "")
assert(string.sub("\000123456789",3,5) == "234")
assert(("\000123456789"):sub(8) == "789")

-- testing string.find
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("", "", 1) == 1)
assert(not string.find("", "", 2))
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)

-- testing string.byte/string.char
assert(string.byte("a") == 97)
assert(string.byte("\xe4") > 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("\xe4"), 0) == "\0\xe4\0")
assert(string.char(string.byte("\xe4l\0óu", 1, -1)) == "\xe4l\0óu")
assert(string.char(string.byte("\xe4l\0óu", 1, 0)) == "")
assert(string.char(string.byte("\xe4l\0óu", -10, 100)) == "\xe4l\0óu")

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) == '')

if string.packsize("i") == 4 then
  -- result length would be 2^31 (int overflow)
  checkerror("too large", string.rep, 'aa', (1 << 30))
  checkerror("too large", string.rep, 'a', (1 << 30), ',')
end

-- repetitions with separator
assert(string.rep('teste', 0, 'xuxu') == '')
assert(string.rep('teste', 1, 'xuxu') == 'teste')
assert(string.rep('\1\0\1', 2, '\0\0') == '\1\0\1\0\0\1\0\1')
assert(string.rep('', 10, '.') == string.rep('.', 9))
assert(not pcall(string.rep, "aa", maxi // 2 + 10))
assert(not pcall(string.rep, "", maxi // 2 + 10, "aa"))

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(string.find(tostring{}, 'table:'))
assert(string.find(tostring(print), 'function:'))
assert(#tostring('\0') == 1)
assert(tostring(true) == "true")
assert(tostring(false) == "false")
assert(tostring(-1203) == "-1203")
assert(tostring(1203.125) == "1203.125")
assert(tostring(-0.5) == "-0.5")
assert(tostring(-32767) == "-32767")
if math.tointeger(2147483647) then   -- no overflow? (32 bits)
  assert(tostring(-2147483647) == "-2147483647")
end
if math.tointeger(4611686018427387904) then   -- no overflow? (64 bits)
  assert(tostring(4611686018427387904) == "4611686018427387904")
  assert(tostring(-4611686018427387904) == "-4611686018427387904")
end

if tostring(0.0) == "0.0" then   -- "standard" coercion float->string
  assert('' .. 12 == '12' and 12.0 .. '' == '12.0')
  assert(tostring(-1203 + 0.0) == "-1203.0")
else   -- compatible coercion
  assert(tostring(0.0) == "0")
  assert('' .. 12 == '12' and 12.0 .. '' == '12')
  assert(tostring(-1203 + 0.0) == "-1203")
end

x = '"ílo"\n\\'
assert(string.format('%q%s', x, x) == '"\\"ílo\\"\\\n\\\\""ílo"\n\\')
assert(string.format('%q', "\0") == [["\0"]])
assert(load(string.format('return %q', x))() == x)
x = "\0\1\0023\5\0009"
assert(load(string.format('return %q', x))() == x)
assert(string.format("\0%c\0%c%x\0", string.byte("\xe4"), string.byte("b"), 140) ==
              "\0\xe4\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"))

do
  local function checkQ (v)
    local s = string.format("%q", v)
    local nv = load("return " .. s)()
    assert(v == nv and math.type(v) == math.type(nv))
  end
  checkQ("\0\0\1\255\u{234}")
  checkQ(math.maxinteger)
  checkQ(math.mininteger)
  checkQ(math.pi)
  checkQ(0.1)
  checkQ(true)
  checkQ(nil)
  checkQ(false)
  checkerror("no literal", string.format, "%q", {})
end

assert(string.format("\0%s\0", "\0\0\1") == "\0\0\0\1\0")
checkerror("contains zeros", string.format, "%10s", "\0")

-- format x tostring
assert(string.format("%s %s", nil, true) == "nil true")
assert(string.format("%s %.4s", false, true) == "false true")
assert(string.format("%.3s %.3s", false, true) == "fal tru")
local m = setmetatable({}, {__tostring = function () return "hello" end,
                            __name = "hi"})
assert(string.format("%s %.10s", m, m) == "hello hello")
getmetatable(m).__tostring = nil   -- will use '__name' from now on
assert(string.format("%.4s", m) == "hi: ")

getmetatable(m).__tostring = function () return {} end
checkerror("'__tostring' must return a string", tostring, m)

assert(string.format("%x", 0.0) == "0")
assert(string.format("%02x", 0.0) == "00")
assert(string.format("%08X", 0xFFFFFFFF) == "FFFFFFFF")
assert(string.format("%+08d", 31501) == "+0031501")
assert(string.format("%+08d", -30927) == "-0030927")


-- TODO: when figured out number limit stuff

-- do    -- longest number that can be formatted
--   local i = 1
--   local j = 10000
--   while i + 1 < j do   -- binary search for maximum finite float
--     local m = (i + j) // 2
--     if 10^m < math.huge then i = m else j = m end
--   end
--   assert(10^i < math.huge and 10^j == math.huge)
--   local s = string.format('%.99f', -(10^i))
--   assert(string.len(s) >= i + 101)
--   assert(tonumber(s) == -(10^i))
-- end


-- -- testing large numbers for format
-- do   -- assume at least 32 bits
--   local max, min = 0x7fffffff, -0x80000000    -- "large" for 32 bits
--   assert(string.sub(string.format("%8x", -1), -8) == "ffffffff")
--   assert(string.format("%x", max) == "7fffffff")
--   assert(string.sub(string.format("%x", min), -8) == "80000000")
--   assert(string.format("%d", max) ==  "2147483647")
--   assert(string.format("%d", min) == "-2147483648")
--   assert(string.format("%u", 0xffffffff) == "4294967295")
--   assert(string.format("%o", 0xABCD) == "125715")

--   max, min = 0x7fffffffffffffff, -0x8000000000000000
--   if max > 2.0^53 then  -- only for 64 bits
--     assert(string.format("%x", (2^52 | 0) - 1) == "fffffffffffff")
--     assert(string.format("0x%8X", 0x8f000003) == "0x8F000003")
--     assert(string.format("%d", 2^53) == "9007199254740992")
--     assert(string.format("%i", -2^53) == "-9007199254740992")
--     assert(string.format("%x", max) == "7fffffffffffffff")
--     assert(string.format("%x", min) == "8000000000000000")
--     assert(string.format("%d", max) ==  "9223372036854775807")
--     assert(string.format("%d", min) == "-9223372036854775808")
--     assert(string.format("%u", ~(-1 << 64)) == "18446744073709551615")
--     assert(tostring(1234567890123) == '1234567890123')
--   end
-- end

do print("testing 'format %a %A'")
  local function matchhexa (n)
    local s = string.format("%a", n)
    -- result matches ISO C requirements
    assert(string.find(s, "^%-?0x[1-9a-f]%.?[0-9a-f]*p[-+]?%d+$"))
    assert(tonumber(s) == n)  -- and has full precision
    s = string.format("%A", n)
    assert(string.find(s, "^%-?0X[1-9A-F]%.?[0-9A-F]*P[-+]?%d+$"))
    assert(tonumber(s) == n)
  end
  for _, n in ipairs{0.1, -0.1, 1/3, -1/3, 1e30, -1e30,
                     -45/247, 1, -1, 2, -2, 3e-20, -3e-20} do
    matchhexa(n)
  end

  assert(string.find(string.format("%A", 0.0), "^0X0%.?0?P%+?0$"))
  -- print(string.format("%a", -0.0))
  -- assert(string.find(string.format("%a", -0.0), "^%-0x0%.?0?p%+?0$"))

  -- if not _port then   -- test inf, -inf, NaN, and -0.0
  --   assert(string.find(string.format("%a", 1/0), "^inf"))
  --   assert(string.find(string.format("%A", -1/0), "^%-INF"))
  --   assert(string.find(string.format("%a", 0/0), "^%-?nan"))
  --   assert(string.find(string.format("%a", -0.0), "^%-0x0"))
  -- end
  
  -- if not pcall(string.format, "%.3a", 0) then
  --   (Message or print)("\n >>> modifiers for format '%a' not available <<<\n")
  -- else
  --   assert(string.find(string.format("%+.2A", 12), "^%+0X%x%.%x0P%+?%d$"))
  --   assert(string.find(string.format("%.4A", -12), "^%-0X%x%.%x000P%+?%d$"))
  -- end
end