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helper.lua: set __metatable field to guard against external access to metatables

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Celtic Minstrel 2016-10-10 17:41:23 -04:00 • committed by GitHub
parent d7bb7dc560
commit 79647ff9d9
1 changed files with 9 additions and 4 deletions
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13
data/lua/helper.lua
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@ -157,7 +157,9 @@ function helper.move_unit_fake(filter, to_x, to_y)
wesnoth.set_variable("LUA_move_unit")
end
local variable_mt = {}
local variable_mt = {
__metatable = "WML variable proxy"
}
local function get_variable_proxy(k)
local v = wesnoth.get_variable(k, true)
@ -195,6 +197,7 @@ function variable_mt.__newindex(t, k, v)
end
local root_variable_mt = {
__metatable = "WML variables",
__index = function(t, k) return get_variable_proxy(k) end,
__newindex = function(t, k, v)
if type(v) == "function" then
@ -207,7 +210,7 @@ local root_variable_mt = {
end
}
--! Sets the metable of @a t so that it can be used to access WML variables.
--! Sets the metatable of @a t so that it can be used to access WML variables.
--! @return @a t.
--! @code
--! helper.set_wml_var_metatable(_G)
@ -218,12 +221,13 @@ function helper.set_wml_var_metatable(t)
end
local fire_action_mt = {
__metatable = "WML actions",
__index = function(t, n)
return function(cfg) wesnoth.fire(n, cfg) end
end
}
--! Sets the metable of @a t so that it can be used to fire WML actions.
--! Sets the metatable of @a t so that it can be used to fire WML actions.
--! @return @a t.
--! @code
--! W = helper.set_wml_action_metatable {}
@ -234,12 +238,13 @@ function helper.set_wml_action_metatable(t)
end
local create_tag_mt = {
__metatable = "WML tag builder",
__index = function(t, n)
return function(cfg) return { n, cfg } end
end
}
--! Sets the metable of @a t so that it can be used to create subtags with less brackets.
--! Sets the metatable of @a t so that it can be used to create subtags with less brackets.
--! @return @a t.
--! @code
--! T = helper.set_wml_tag_metatable {}