path: root/test/test-suite/strings.test.js

"use strict";

const lua = require('../../src/lua.js');
const lauxlib = require('../../src/lauxlib.js');
const lualib = require('../../src/lualib.js');
const {to_luastring} = require("../../src/fengaricore.js");

const checkerror = `
    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
`;

test('[test-suite] strings: string comparisons', () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        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'))
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test('[test-suite] strings: string.sub', () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        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'))
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test('[test-suite] strings: string.find', () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        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)
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test('[test-suite] strings: string.len and #', () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        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)
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test('[test-suite] strings: string.byte/string.char', () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        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
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test('[test-suite] strings: repetitions with separator', () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        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
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test('[test-suite] strings: tostring', () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        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
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test('[test-suite] strings: string.format', () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        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"))
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test('[test-suite] strings: %q', () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        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
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test('[test-suite] strings: embedded zeros error', () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        assert(string.format("\\0%s\\0", "\\0\\0\\1") == "\\0\\0\\0\\1\\0")
        checkerror("contains zeros", string.format, "%10s", "\\0")
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test('[test-suite] strings: format x tostring', () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        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")
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test('[test-suite] strings: longest number that can be formatted', () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        do
          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('%.20f', -(10^i)) -- TODO: %.99f not possible with sprintf.js
          -- assert(string.len(s) >= i + 101)
          assert(tonumber(s) == -(10^i))
        end
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test('[test-suite] strings: large numbers for format', () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        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
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test("[test-suite] strings: 'format %a %A'", () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        do
          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$"))
          assert(string.find(string.format("%a", -0.0), "^%-0x0%.?0?p%+?0$"))

          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
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test("[test-suite] strings: errors in format", () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        local function check (fmt, msg)
          checkerror(msg, string.format, fmt, 10)
        end

        local aux = string.rep('0', 600)
        check("%100.3d", "too long")
        check("%1"..aux..".3d", "too long")
        check("%1.100d", "too long")
        check("%10.1"..aux.."004d", "too long")
        check("%t", "invalid option")
        check("%"..aux.."d", "repeated flags")
        check("%d %d", "no value")


        assert(load("return 1\\n--comment without ending EOL")() == 1)
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test("[test-suite] strings: table.concat", () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        checkerror("table expected", table.concat, 3)
        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=1,300 do a[i] = "xuxu" end
        assert(table.concat(a, "123").."123" == string.rep("xuxu123", 300))
        assert(table.concat(a, "b", 20, 20) == "xuxu")
        assert(table.concat(a, "", 20, 21) == "xuxuxuxu")
        assert(table.concat(a, "x", 22, 21) == "")
        assert(table.concat(a, "3", 299) == "xuxu3xuxu")
        assert(table.concat({}, "x", maxi, maxi - 1) == "")
        assert(table.concat({}, "x", mini + 1, mini) == "")
        assert(table.concat({}, "x", maxi, mini) == "")
        assert(table.concat({[maxi] = "alo"}, "x", maxi, maxi) == "alo")
        assert(table.concat({[maxi] = "alo", [maxi - 1] = "y"}, "-", maxi - 1, maxi)
               == "y-alo")

        assert(not pcall(table.concat, {"a", "b", {}}))

        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) == "")
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


// TODO: os.setlocale NYI
test.skip("[test-suite] strings: locale", () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        if not _port then

          local locales = { "ptb", "pt_BR.iso88591", "ISO-8859-1" }
          local function trylocale (w)
            for i = 1, #locales do
              if os.setlocale(locales[i], w) then
                print(string.format("'%s' locale set to '%s'", w, locales[i]))
                return locales[i]
              end
            end
            print(string.format("'%s' locale not found", w))
            return false
          end

          if trylocale("collate")  then
            assert("alo" < "álo" and "álo" < "amo")
          end

          if trylocale("ctype") then
            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')

        end
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test("[test-suite] strings: bug in Lua 5.3.2: 'gmatch' iterator does not work across coroutines", () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        do
          local f = string.gmatch("1 2 3 4 5", "%d+")
          assert(f() == "1")
          co = coroutine.wrap(f)
          assert(co() == "2")
        end
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(checkerror + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});