path: root/test/test-suite/nextvar.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 prefix = `
    local function checkerror (msg, f, ...)
      local s, err = pcall(f, ...)
      assert(not s and string.find(err, msg))
    end
`;

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

    let luaCode = `
        local a = {}

        -- make sure table has lots of space in hash part
        for i=1,100 do a[i.."+"] = true end
        for i=1,100 do a[i.."+"] = nil end
        -- fill hash part with numeric indices testing size operator
        for i=1,100 do
          a[i] = true
          assert(#a == i)
        end
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


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

    let luaCode = `
        local x = 0
        for k,v in ipairs{10,20,30;x=12} do
          x = x + 1
          assert(k == x and v == x * 10)
        end

        for _ in ipairs{x=12, y=24} do assert(nil) end
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


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

    let luaCode = `
        x = false
        local i = 0
        for k,v in ipairs{true,false,true,false} do
          i = i + 1
          x = not x
          assert(x == v)
        end
        assert(i == 4)
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test("[test-suite] nextvar: iterator function is always the same", () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        assert(type(ipairs{}) == 'function' and ipairs{} == ipairs{})
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


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

    let luaCode = `
        -- testing table sizes

        local function log2 (x) return math.log(x, 2) end

        local function mp2 (n)   -- minimum power of 2 >= n
          local mp = 2^math.ceil(log2(n))
          assert(n == 0 or (mp/2 < n and n <= mp))
          return mp
        end

        local function fb (n)
          local r, nn = T.int2fb(n)
          assert(r < 256)
          return nn
        end

        -- test fb function
        for a = 1, 10000 do   -- all numbers up to 10^4
          local n = fb(a)
          assert(a <= n and n <= a*1.125)
        end
        local a = 1024   -- plus a few up to 2 ^30
        local lim = 2^30
        while a < lim do
          local n = fb(a)
          assert(a <= n and n <= a*1.125)
          a = math.ceil(a*1.3)
        end


        local function check (t, na, nh)
          local a, h = T.querytab(t)
          if a ~= na or h ~= nh then
            print(na, nh, a, h)
            assert(nil)
          end
        end


        -- testing C library sizes
        do
          local s = 0
          for _ in pairs(math) do s = s + 1 end
          check(math, 0, mp2(s))
        end


        -- testing constructor sizes
        local lim = 40
        local s = 'return {'
        for i=1,lim do
          s = s..i..','
          local s = s
          for k=0,lim do
            local t = load(s..'}', '')()
            assert(#t == i)
            check(t, fb(i), mp2(k))
            s = string.format('%sa%d=%d,', s, k, k)
          end
        end


        -- tests with unknown number of elements
        local a = {}
        for i=1,lim do a[i] = i end   -- build auxiliary table
        for k=0,lim do
          local a = {table.unpack(a,1,k)}
          assert(#a == k)
          check(a, k, 0)
          a = {1,2,3,table.unpack(a,1,k)}
          check(a, k+3, 0)
          assert(#a == k + 3)
        end


        -- testing tables dynamically built
        local lim = 130
        local a = {}; a[2] = 1; check(a, 0, 1)
        a = {}; a[0] = 1; check(a, 0, 1); a[2] = 1; check(a, 0, 2)
        a = {}; a[0] = 1; a[1] = 1; check(a, 1, 1)
        a = {}
        for i = 1,lim do
          a[i] = 1
          assert(#a == i)
          check(a, mp2(i), 0)
        end

        a = {}
        for i = 1,lim do
          a['a'..i] = 1
          assert(#a == 0)
          check(a, 0, mp2(i))
        end

        a = {}
        for i=1,16 do a[i] = i end
        check(a, 16, 0)
        do
          for i=1,11 do a[i] = nil end
          for i=30,50 do a[i] = nil end   -- force a rehash (?)
          check(a, 0, 8)   -- only 5 elements in the table
          a[10] = 1
          for i=30,50 do a[i] = nil end   -- force a rehash (?)
          check(a, 0, 8)   -- only 6 elements in the table
          for i=1,14 do a[i] = nil end
          for i=18,50 do a[i] = nil end   -- force a rehash (?)
          check(a, 0, 4)   -- only 2 elements ([15] and [16])
        end

        -- reverse filling
        for i=1,lim do
          local a = {}
          for i=i,1,-1 do a[i] = i end   -- fill in reverse
          check(a, mp2(i), 0)
        end

        -- size tests for vararg
        lim = 35
        function foo (n, ...)
          local arg = {...}
          check(arg, n, 0)
          assert(select('#', ...) == n)
          arg[n+1] = true
          check(arg, mp2(n+1), 0)
          arg.x = true
          check(arg, mp2(n+1), 1)
        end
        local a = {}
        for i=1,lim do a[i] = true; foo(i, table.unpack(a)) end
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test("[test-suite] nextvar: test size operation on empty tables", () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

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


test("[test-suite] nextvar: test size operation on empty tables", () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

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


test("[test-suite] nextvar: next uses always the same iteration function", () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        local nofind = {}

        a,b,c = 1,2,3
        a,b,c = nil


        -- next uses always the same iteraction function
        assert(next{} == next{})

        local function find (name)
          local n,v
          while 1 do
            n,v = next(_G, n)
            if not n then return nofind end
            assert(v ~= nil)
            if n == name then return v end
          end
        end

        local function find1 (name)
          for n,v in pairs(_G) do
            if n==name then return v end
          end
          return nil  -- not found
        end


        assert(print==find("print") and print == find1("print"))
        assert(_G["print"]==find("print"))
        assert(assert==find1("assert"))
        assert(nofind==find("return"))
        assert(not find1("return"))
        _G["ret" .. "urn"] = nil
        assert(nofind==find("return"))
        _G["xxx"] = 1
        assert(xxx==find("xxx"))
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


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

    let luaCode = `
        checkerror("invalid key", next, {10,20}, 3)
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test("[test-suite] nextvar: both 'pairs' and 'ipairs' need an argument", () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

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


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

    let luaCode = `
        a = {}
        for i=0,10000 do
          if math.fmod(i,10) ~= 0 then
            a['x'..i] = i
          end
        end

        n = {n=0}
        for i,v in pairs(a) do
          n.n = n.n+1
          assert(i and v and a[i] == v)
        end
        assert(n.n == 9000)
        a = nil
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


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

    let luaCode = `
        local function checknext (a)
          local b = {}
          do local k,v = next(a); while k do b[k] = v; k,v = next(a,k) end end
          for k,v in pairs(b) do assert(a[k] == v) end
          for k,v in pairs(a) do assert(b[k] == v) end
        end

        checknext{1,x=1,y=2,z=3}
        checknext{1,2,x=1,y=2,z=3}
        checknext{1,2,3,x=1,y=2,z=3}
        checknext{1,2,3,4,x=1,y=2,z=3}
        checknext{1,2,3,4,5,x=1,y=2,z=3}
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


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

    let luaCode = `
        assert(#{} == 0)
        assert(#{[-1] = 2} == 0)
        assert(#{1,2,3,nil,nil} == 3)
        for i=0,40 do
          local a = {}
          for j=1,i do a[j]=j end
          assert(#a == i)
        end
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


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

    let luaCode = `
        -- 'maxn' is now deprecated, but it is easily defined in Lua
        function table.maxn (t)
          local max = 0
          for k in pairs(t) do
            max = (type(k) == 'number') and math.max(max, k) or max
          end
          return max
        end

        assert(table.maxn{} == 0)
        assert(table.maxn{["1000"] = true} == 0)
        assert(table.maxn{["1000"] = true, [24.5] = 3} == 24.5)
        assert(table.maxn{[1000] = true} == 1000)
        assert(table.maxn{[10] = true, [100*math.pi] = print} == 100*math.pi)

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


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

    let luaCode = `
        a = {}
        for i=0,50 do a[2^i] = true end
        assert(a[#a])
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


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

    let luaCode = `
        local t = {[{1}] = 1, [{2}] = 2, [string.rep("x ", 4)] = 3,
                   [100.3] = 4, [4] = 5}

        local n = 0
        for k, v in pairs( t ) do
          n = n+1
          assert(t[k] == v)
          t[k] = nil
          --collectgarbage()
          assert(t[k] == nil)
        end
        assert(n == 5)


        local function test (a)
          assert(not pcall(table.insert, a, 2, 20));
          table.insert(a, 10); table.insert(a, 2, 20);
          table.insert(a, 1, -1); table.insert(a, 40);
          table.insert(a, #a+1, 50)
          table.insert(a, 2, -2)
          assert(not pcall(table.insert, a, 0, 20));
          assert(not pcall(table.insert, a, #a + 2, 20));
          assert(table.remove(a,1) == -1)
          assert(table.remove(a,1) == -2)
          assert(table.remove(a,1) == 10)
          assert(table.remove(a,1) == 20)
          assert(table.remove(a,1) == 40)
          assert(table.remove(a,1) == 50)
          assert(table.remove(a,1) == nil)
          assert(table.remove(a) == nil)
          assert(table.remove(a, #a) == nil)
        end

        a = {n=0, [-7] = "ban"}
        test(a)
        assert(a.n == 0 and a[-7] == "ban")

        a = {[-7] = "ban"};
        test(a)
        assert(a.n == nil and #a == 0 and a[-7] == "ban")

        a = {[-1] = "ban"}
        test(a)
        assert(#a == 0 and table.remove(a) == nil and a[-1] == "ban")

        a = {[0] = "ban"}
        assert(#a == 0 and table.remove(a) == "ban" and a[0] == nil)

        table.insert(a, 1, 10); table.insert(a, 1, 20); table.insert(a, 1, -1)
        assert(table.remove(a) == 10)
        assert(table.remove(a) == 20)
        assert(table.remove(a) == -1)
        assert(table.remove(a) == nil)

        a = {'c', 'd'}
        table.insert(a, 3, 'a')
        table.insert(a, 'b')
        assert(table.remove(a, 1) == 'c')
        assert(table.remove(a, 1) == 'd')
        assert(table.remove(a, 1) == 'a')
        assert(table.remove(a, 1) == 'b')
        assert(table.remove(a, 1) == nil)
        assert(#a == 0 and a.n == nil)

        a = {10,20,30,40}
        assert(table.remove(a, #a + 1) == nil)
        assert(not pcall(table.remove, a, 0))
        assert(a[#a] == 40)
        assert(table.remove(a, #a) == 40)
        assert(a[#a] == 30)
        assert(table.remove(a, 2) == 20)
        assert(a[#a] == 30 and #a == 2)
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


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

    let luaCode = `
        do
          local function test (proxy, t)
            for i = 1, 10 do
              table.insert(proxy, 1, i)
            end
            assert(#proxy == 10 and #t == 10)
            for i = 1, 10 do
              assert(t[i] == 11 - i)
            end
            table.sort(proxy)
            for i = 1, 10 do
              assert(t[i] == i and proxy[i] == i)
            end
            assert(table.concat(proxy, ",") == "1,2,3,4,5,6,7,8,9,10")
            for i = 1, 8 do
              assert(table.remove(proxy, 1) == i)
            end
            assert(#proxy == 2 and #t == 2)
            local a, b, c = table.unpack(proxy)
            assert(a == 9 and b == 10 and c == nil)
          end

          -- all virtual
          local t = {}
          local proxy = setmetatable({}, {
            __len = function () return #t end,
            __index = t,
            __newindex = t,
          })
          test(proxy, t)

          -- only __newindex
          local count = 0
          t = setmetatable({}, {
            __newindex = function (t,k,v) count = count + 1; rawset(t,k,v) end})
          test(t, t)
          assert(count == 10)   -- after first 10, all other sets are not new

          -- no __newindex
          t = setmetatable({}, {
            __index = function (_,k) return k + 1 end,
            __len = function (_) return 5 end})
          assert(table.concat(t, ";") == "2;3;4;5;6")

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


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

    let luaCode = `
        local tab = {10, 20, 30}
        local mt = {}
        local u = T.newuserdata(0)
        checkerror("table expected", table.insert, u, 40)
        checkerror("table expected", table.remove, u)
        debug.setmetatable(u, mt)
        checkerror("table expected", table.insert, u, 40)
        checkerror("table expected", table.remove, u)
        mt.__index = tab
        checkerror("table expected", table.insert, u, 40)
        checkerror("table expected", table.remove, u)
        mt.__newindex = tab
        checkerror("table expected", table.insert, u, 40)
        checkerror("table expected", table.remove, u)
        mt.__len = function () return #tab end
        table.insert(u, 40)
        assert(#u == 4 and #tab == 4 and u[4] == 40 and tab[4] == 40)
        assert(table.remove(u) == 40)
        table.insert(u, 1, 50)
        assert(#u == 4 and #tab == 4 and u[4] == 30 and tab[1] == 50)

        mt.__newindex = nil
        mt.__len = nil
        local tab2 = {}
        local u2 = T.newuserdata(0)
        debug.setmetatable(u2, {__newindex = function (_, k, v) tab2[k] = v end})
        table.move(u, 1, 4, 1, u2)
        assert(#tab2 == 4 and tab2[1] == tab[1] and tab2[4] == tab[4])
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


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

    let luaCode = `
        a = {}
        for i=1,1000 do
          a[i] = i; a[i-1] = nil
        end
        assert(next(a,nil) == 1000 and next(a,1000) == nil)

        assert(next({}) == nil)
        assert(next({}, nil) == nil)

        for a,b in pairs{} do error"not here" end
        for i=1,0 do error'not here' end
        for i=0,1,-1 do error'not here' end
        a = nil; for i=1,1 do assert(not a); a=1 end; assert(a)
        a = nil; for i=1,1,-1 do assert(not a); a=1 end; assert(a)
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test("[test-suite] nextvar: testing floats in numeric for", () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        do
          local a
          -- integer count
          a = 0; for i=1, 1, 1 do a=a+1 end; assert(a==1)
          a = 0; for i=10000, 1e4, -1 do a=a+1 end; assert(a==1)
          a = 0; for i=1, 0.99999, 1 do a=a+1 end; assert(a==0)
          a = 0; for i=9999, 1e4, -1 do a=a+1 end; assert(a==0)
          a = 0; for i=1, 0.99999, -1 do a=a+1 end; assert(a==1)

          -- float count
          a = 0; for i=0, 0.999999999, 0.1 do a=a+1 end; assert(a==10)
          a = 0; for i=1.0, 1, 1 do a=a+1 end; assert(a==1)
          a = 0; for i=-1.5, -1.5, 1 do a=a+1 end; assert(a==1)
          a = 0; for i=1e6, 1e6, -1 do a=a+1 end; assert(a==1)
          a = 0; for i=1.0, 0.99999, 1 do a=a+1 end; assert(a==0)
          a = 0; for i=99999, 1e5, -1.0 do a=a+1 end; assert(a==0)
          a = 0; for i=1.0, 0.99999, -1 do a=a+1 end; assert(a==1)
        end
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


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

    let luaCode = `
        a = 0; for i="10","1","-2" do a=a+1 end; assert(a==5)
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


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

    let luaCode = `
        do
          local c
          local function checkfloat (i)
            assert(math.type(i) == "float")
            c = c + 1
          end

          c = 0; for i = 1.0, 10 do checkfloat(i) end
          assert(c == 10)

          c = 0; for i = -1, -10, -1.0 do checkfloat(i) end
          assert(c == 10)

          local function checkint (i)
            assert(math.type(i) == "integer")
            c = c + 1
          end

          local m = math.maxinteger
          c = 0; for i = m, m - 10, -1 do checkint(i) end
          assert(c == 11)

          c = 0; for i = 1, 10.9 do checkint(i) end
          assert(c == 10)

          c = 0; for i = 10, 0.001, -1 do checkint(i) end
          assert(c == 10)

          c = 0; for i = 1, "10.8" do checkint(i) end
          assert(c == 10)

          c = 0; for i = 9, "3.4", -1 do checkint(i) end
          assert(c == 6)

          c = 0; for i = 0, " -3.4  ", -1 do checkint(i) end
          assert(c == 4)

          c = 0; for i = 100, "96.3", -2 do checkint(i) end
          assert(c == 2)

          c = 0; for i = 1, math.huge do if i > 10 then break end; checkint(i) end
          assert(c == 10)

          c = 0; for i = -1, -math.huge, -1 do
                   if i < -10 then break end; checkint(i)
                  end
          assert(c == 10)


          for i = math.mininteger, -10e100 do assert(false) end
          for i = math.maxinteger, 10e100, -1 do assert(false) end

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


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

    let luaCode = `
        local function f (n, p)
          local t = {}; for i=1,p do t[i] = i*10 end
          return function (_,n)
                   if n > 0 then
                     n = n-1
                     return n, table.unpack(t)
                   end
                 end, nil, n
        end

        local x = 0
        for n,a,b,c,d in f(5,3) do
          x = x+1
          assert(a == 10 and b == 20 and c == 30 and d == nil)
        end
        assert(x == 5)
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test("[test-suite] nextvar: testing __pairs and __ipairs metamethod", () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        a = {}
        do
          local x,y,z = pairs(a)
          assert(type(x) == 'function' and y == a and z == nil)
        end

        local function foo (e,i)
          assert(e == a)
          if i <= 10 then return i+1, i+2 end
        end

        local function foo1 (e,i)
          i = i + 1
          assert(e == a)
          if i <= e.n then return i,a[i] end
        end

        setmetatable(a, {__pairs = function (x) return foo, x, 0 end})

        local i = 0
        for k,v in pairs(a) do
          i = i + 1
          assert(k == i and v == k+1)
        end

        a.n = 5
        a[3] = 30
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});


test("[test-suite] nextvar: testing ipairs with metamethods", () => {
    let L = lauxlib.luaL_newstate();
    if (!L) throw Error("failed to create lua state");

    let luaCode = `
        a = {n=10}
        setmetatable(a, { __index = function (t,k)
                             if k <= t.n then return k * 10 end
                          end})
        i = 0
        for k,v in ipairs(a) do
          i = i + 1
          assert(k == i and v == i * 10)
        end
        assert(i == a.n)
    `;
    lualib.luaL_openlibs(L);
    if (lauxlib.luaL_loadstring(L, to_luastring(prefix + luaCode)) === lua.LUA_ERRSYNTAX)
        throw new SyntaxError(lua.lua_tojsstring(L, -1));
    lua.lua_call(L, 0, 0);
});