mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Scribunto
synced 2024-11-27 09:40:12 +00:00
40b8bd2caa
Clean up trailing whitespace from all of our code, and add comments indicating that apparently unused variables are ScopedCallbacks. Change-Id: I8e5997797cc7b1c64c5351ec112a18f30edc8fef
114 lines
3.3 KiB
Lua
114 lines
3.3 KiB
Lua
-- This file is for anything that needs to be set up before a Lua engine can
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-- start. Things in this file may run more than once, so avoid putting anything
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-- other than function definitions in it. Also, because this can run before
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-- PHP can do anything, mw_interface is unavailable here.
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mw = mw or {}
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--- Do a "deep copy" of a table or other value.
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function mw.clone( val )
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local tableRefs = {}
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local function recursiveClone( val )
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if type( val ) == 'table' then
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-- Encode circular references correctly
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if tableRefs[val] ~= nil then
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return tableRefs[val]
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end
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local retVal
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retVal = {}
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tableRefs[val] = retVal
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-- Copy metatable
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if getmetatable( val ) then
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setmetatable( retVal, recursiveClone( getmetatable( val ) ) )
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end
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for key, elt in pairs( val ) do
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retVal[key] = recursiveClone( elt )
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end
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return retVal
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else
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return val
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end
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end
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return recursiveClone( val )
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end
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--- Make isolation-safe setfenv and getfenv functions
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--
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-- @param protectedEnvironments A table where the keys are protected environment
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-- tables. These environments cannot be accessed with getfenv(), and
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-- functions with these environments cannot be modified or accessed using
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-- integer indexes to setfenv(). However, functions with these environments
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-- can have their environment set with setfenv() with a function value
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-- argument.
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--
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-- @param protectedFunctions A table where the keys are protected functions,
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-- which cannot have their environments set by setfenv() with a function
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-- value argument.
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--
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-- @return setfenv
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-- @return getfenv
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function mw.makeProtectedEnvFuncs( protectedEnvironments, protectedFunctions )
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local old_setfenv = setfenv
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local old_getfenv = getfenv
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local function my_setfenv( func, newEnv )
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if type( func ) == 'number' then
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local stackIndex = math.floor( func )
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if stackIndex <= 0 then
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error( "'setfenv' cannot set the global environment, it is protected", 2 )
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end
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if stackIndex > 10 then
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error( "'setfenv' cannot set an environment at a level greater than 10", 2 )
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end
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-- Add one because we are still in Lua and 1 is right here
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stackIndex = stackIndex + 1
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local env = old_getfenv( stackIndex )
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if env == nil or protectedEnvironments[ env ] then
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error( "'setfenv' cannot set the requested environment, it is protected", 2 )
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end
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func = old_setfenv( stackIndex, newEnv )
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elseif type( func ) == 'function' then
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if protectedFunctions[func] then
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error( "'setfenv' cannot be called on a protected function", 2 )
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end
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local env = old_getfenv( func )
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if env == nil or protectedEnvironments[ env ] then
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error( "'setfenv' cannot set the requested environment, it is protected", 2 )
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end
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old_setfenv( func, newEnv )
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else
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error( "'setfenv' can only be called with a function or integer as the first argument", 2 )
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end
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return func
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end
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local function my_getfenv( func )
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local env
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if type( func ) == 'number' then
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if func <= 0 then
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error( "'getfenv' cannot get the global environment" )
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end
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env = old_getfenv( func + 1 )
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elseif type( func ) == 'function' then
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env = old_getfenv( func )
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else
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error( "'getfenv' cannot get the global environment" )
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end
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if protectedEnvironments[env] then
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return nil
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else
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return env
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end
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end
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return my_setfenv, my_getfenv
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end
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return mw
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