mediawiki-extensions-Scribunto/engines/LuaCommon/lualib/mwInit.lua
Jackmcbarn 1492ac3d68 Avoid running all of mw.lua twice
LuaStandalone only uses 2 functions from mw.lua, so move them to their own
file to avoid running the whole thing twice.

Change-Id: Ia4d58f44be17f7a71666dbe750e66d9d90cb5c2f
2014-05-15 14:15:08 -04:00

114 lines
3.3 KiB
Lua

-- This file is for anything that needs to be set up before a Lua engine can
-- start. Things in this file may run more than once, so avoid putting anything
-- other than function definitions in it. Also, because this can run before
-- PHP can do anything, mw_interface is unavailable here.
mw = mw or {}
--- Do a "deep copy" of a table or other value.
function mw.clone( val )
local tableRefs = {}
local function recursiveClone( val )
if type( val ) == 'table' then
-- Encode circular references correctly
if tableRefs[val] ~= nil then
return tableRefs[val]
end
local retVal
retVal = {}
tableRefs[val] = retVal
-- Copy metatable
if getmetatable( val ) then
setmetatable( retVal, recursiveClone( getmetatable( val ) ) )
end
for key, elt in pairs( val ) do
retVal[key] = recursiveClone( elt )
end
return retVal
else
return val
end
end
return recursiveClone( val )
end
--- Make isolation-safe setfenv and getfenv functions
--
-- @param protectedEnvironments A table where the keys are protected environment
-- tables. These environments cannot be accessed with getfenv(), and
-- functions with these environments cannot be modified or accessed using
-- integer indexes to setfenv(). However, functions with these environments
-- can have their environment set with setfenv() with a function value
-- argument.
--
-- @param protectedFunctions A table where the keys are protected functions,
-- which cannot have their environments set by setfenv() with a function
-- value argument.
--
-- @return setfenv
-- @return getfenv
function mw.makeProtectedEnvFuncs( protectedEnvironments, protectedFunctions )
local old_setfenv = setfenv
local old_getfenv = getfenv
local function my_setfenv( func, newEnv )
if type( func ) == 'number' then
local stackIndex = math.floor( func )
if stackIndex <= 0 then
error( "'setfenv' cannot set the global environment, it is protected", 2 )
end
if stackIndex > 10 then
error( "'setfenv' cannot set an environment at a level greater than 10", 2 )
end
-- Add one because we are still in Lua and 1 is right here
stackIndex = stackIndex + 1
local env = old_getfenv( stackIndex )
if env == nil or protectedEnvironments[ env ] then
error( "'setfenv' cannot set the requested environment, it is protected", 2 )
end
func = old_setfenv( stackIndex, newEnv )
elseif type( func ) == 'function' then
if protectedFunctions[func] then
error( "'setfenv' cannot be called on a protected function", 2 )
end
local env = old_getfenv( func )
if env == nil or protectedEnvironments[ env ] then
error( "'setfenv' cannot set the requested environment, it is protected", 2 )
end
old_setfenv( func, newEnv )
else
error( "'setfenv' can only be called with a function or integer as the first argument", 2 )
end
return func
end
local function my_getfenv( func )
local env
if type( func ) == 'number' then
if func <= 0 then
error( "'getfenv' cannot get the global environment" )
end
env = old_getfenv( func + 1 )
elseif type( func ) == 'function' then
env = old_getfenv( func )
else
error( "'getfenv' cannot get the global environment" )
end
if protectedEnvironments[env] then
return nil
else
return env
end
end
return my_setfenv, my_getfenv
end
return mw