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local function standard(loaded, env)
local r = env or {}
for _, s in ipairs {
--'package',
'coroutine',
'table',
--'io',
'os',
'string',
'math',
'utf8',
'debug',
} do
r[s] = _G[s]
loaded[s] = _G[s]
end
for _, s in ipairs {
'assert',
'collectgarbage',
--'dofile',
'error',
'getmetatable',
'ipairs',
--'loadfile',
'load',
'next',
'pairs',
'pcall',
'print',
'rawequal',
'rawlen',
'rawget',
'rawset',
'select',
'setmetatable',
'tonumber',
'tostring',
'type',
'xpcall',
'_VERSION',
--'require',
} do
r[s] = _G[s]
end
return r
end
local function sandbox_env(loadlua, openfile, loaded, env)
local _LOADED = loaded or {}
local _E = standard(_LOADED, env)
local _PRELOAD = {}
_E.io = {
open = openfile,
}
local function searchpath(name, path)
local err = ''
name = string.gsub(name, '%.', '/')
for c in string.gmatch(path, '[^;]+') do
local filename = string.gsub(c, '%?', name)
local f = openfile(filename)
if f then
f:close()
return filename
end
err = err .. ("\n\tno file '%s'"):format(filename)
end
return nil, err
end
local function searcher_preload(name)
assert(type(_PRELOAD) == "table", "'package.preload' must be a table")
if _PRELOAD[name] == nil then
return ("\n\tno field package.preload['%s']"):format(name)
end
return _PRELOAD[name]
end
local function searcher_lua(name)
assert(type(_E.package.path) == "string", "'package.path' must be a string")
local filename, err = searchpath(name, _E.package.path)
if not filename then
return err
end
local f, err = loadlua(filename)
if not f then
error(("error loading module '%s' from file '%s':\n\t%s"):format(name, filename, err))
end
return f, filename
end
local function require_load(name)
local msg = ''
local _SEARCHERS = _E.package.searchers
assert(type(_SEARCHERS) == "table", "'package.searchers' must be a table")
for _, searcher in ipairs(_SEARCHERS) do
local f, extra = searcher(name)
if type(f) == 'function' then
return f, extra
elseif type(f) == 'string' then
msg = msg .. f
end
end
error(("module '%s' not found:%s"):format(name, msg))
end
_E.require = function(name)
assert(type(name) == "string", ("bad argument #1 to 'require' (string expected, got %s)"):format(type(name)))
local p = _LOADED[name]
if p ~= nil then
return p
end
local init, extra = require_load(name)
if debug.getupvalue(init, 1) == '_ENV' then
debug.setupvalue(init, 1, _E)
end
local res = init(name, extra)
if res ~= nil then
_LOADED[name] = res
end
if _LOADED[name] == nil then
_LOADED[name] = true
end
return _LOADED[name]
end
_E.package = {
config = [[
\
;
?
!
-
]],
loaded = _LOADED,
path = '?.lua',
preload = _PRELOAD,
searchers = { searcher_preload, searcher_lua },
searchpath = searchpath
}
return _E
end
return function(name, root, io_open, loaded, env)
if not root:sub(-1):find '[/\\]' then
root = root .. '/'
end
local function openfile(name, mode)
return io_open(root .. name, mode)
end
local function loadlua(name)
local f = openfile(name, 'r')
if f then
local str = f:read 'a'
f:close()
return load(str, '@' .. root .. name)
end
end
local init = loadlua(name)
if not init then
return
end
if debug.getupvalue(init, 1) == '_ENV' then
debug.setupvalue(init, 1, sandbox_env(loadlua, openfile, loaded, env))
end
return init()
end
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