-- This module implements and its daughter templates such as
-- , and .  
-- Initialise necessary modules.
require('strict')
local makeFileLink = require('Module:File link')._main
local effectiveProtectionLevel = require('Module:Effective protection level')._main
local effectiveProtectionExpiry = require('Module:Effective protection expiry')._main
local yesno = require('Module:Yesno')  
-- Lazily initialise modules and objects we don't always need.
local getArgs, makeMessageBox, lang  
-- Set constants.
local CONFIG_MODULE = 'Module:Protection banner/config'  
---
-- Helper functions
---  
local function makeCategoryLink(cat, sort)
if cat then
return string.format(
'%s',
mw.site.namespaces[14].name,
cat,
sort
end
end  
-- Validation function for the expiry and the protection date
local function validateDate(dateString, dateType)
if not lang then
lang = mw.language.getContentLanguage
end
local success, result = pcall(lang.formatDate, lang, 'U', dateString)
if success then
result = tonumber(result)
if result then
return result
end
end
error(string.format(
'invalid %s: %s',
dateType,
tostring(dateString)
), 4)
end  
local function makeFullUrl(page, query, display)
return string.format(
'[%s %s]',
tostring(mw.uri.fullUrl(page, query)),
display
end  
-- Given a directed graph formatted as node -> table of direct successors,
-- get a table of all nodes reachable from a given node (though always
-- including the given node).
local function getReachableNodes(graph, start)
local toWalk, retval = {[start] = true}, {}
while true do
-- Can't use pairs since we're adding and removing things as we're iterating
local k = next(toWalk) -- This always gets the "first" key
if k == nil then
return retval
end
toWalk[k] = nil
retval[k] = true
for _,v in ipairs(graph[k]) do
if not retval[v] then
toWalk[v] = true
end
end
end
end  
---
-- Protection class
---  
local Protection = {}
Protection.__index = Protection  
Protection.supportedActions = {
edit = true,
move = true,
autoreview = true,
upload = true
}  
Protection.bannerConfigFields = {
'text',
'explanation',
'tooltip',
'alt',
'link',
'image'
}  
function Protection.new(args, cfg, title)
local obj = {}
obj._cfg = cfg
obj.title = title or mw.title.getCurrentTitle  
-- Set action
if not args.action then
obj.action = 'edit'
elseif Protection.supportedActions[args.action] then
obj.action = args.action
else
error(string.format(
'invalid action: %s',
tostring(args.action)
), 3)
end  
-- Set level
obj.level = args.demolevel or effectiveProtectionLevel(obj.action, obj.title)
if not obj.level or (obj.action == 'move' and obj.level == 'autoconfirmed') then
-- Users need to be autoconfirmed to move pages anyway, so treat
-- semi-move-protected pages as unprotected.
obj.level = '*'
end  
-- Set expiry
local effectiveExpiry = effectiveProtectionExpiry(obj.action, obj.title)
if effectiveExpiry == 'infinity' then
obj.expiry = 'indef'
elseif effectiveExpiry ~= 'unknown' then
obj.expiry = validateDate(effectiveExpiry, 'expiry date')
end  
-- Set reason
if args[1] then
obj.reason = mw.ustring.lower(args[1])
if obj.reason:find('|') then
error('reasons cannot contain the pipe character ("|")', 3)
end
end  
-- Set protection date
if args.date then
obj.protectionDate = validateDate(args.date, 'protection date')
end  
-- Set banner config
do
obj.bannerConfig = {}
local configTables = {}
if cfg.banners[obj.action] then
configTables[#configTables + 1] = cfg.banners[obj.action][obj.reason]
end
if cfg.defaultBanners[obj.action] then
configTables[#configTables + 1] = cfg.defaultBanners[obj.action][obj.level]
configTables[#configTables + 1] = cfg.defaultBanners[obj.action].default
end
configTables[#configTables + 1] = cfg.masterBanner
for i, field in ipairs(Protection.bannerConfigFields) do
for j, t in ipairs(configTables) do
if t[field] then
obj.bannerConfig[field] = t[field]
break
end
end
end
end
return setmetatable(obj, Protection)
end  
function Protection:isUserScript
-- Whether the page is a user JavaScript or CSS page.
local title = self.title
return title.namespace == 2 and (
title.contentModel == 'javascript' or title.contentModel == 'css'
end  
function Protection:isProtected
return self.level ~= '*'
end  
function Protection:shouldShowLock
-- Whether we should output a banner/padlock
return self:isProtected and not self:isUserScript
end  
-- Whether this page needs a protection category.
Protection.shouldHaveProtectionCategory = Protection.shouldShowLock  
function Protection:isTemporary
return type(self.expiry) == 'number'
end  
function Protection:makeProtectionCategory
if not self:shouldHaveProtectionCategory then
return ''
end  
local cfg = self._cfg
local title = self.title  
-- Get the expiry key fragment.
local expiryFragment
if self.expiry == 'indef' then
expiryFragment = self.expiry
elseif type(self.expiry) == 'number' then
expiryFragment = 'temp'
end  
-- Get the namespace key fragment.
local namespaceFragment = cfg.categoryNamespaceKeys[title.namespace]
if not namespaceFragment and title.namespace % 2 == 1 then
namespaceFragment = 'talk'
end  
-- Define the order that key fragments are tested in. This is done with an
-- array of tables containing the value to be tested, along with its
-- position in the cfg.protectionCategories table.
local order = {
{val = expiryFragment, keypos = 1},
{val = namespaceFragment, keypos = 2},
{val = self.reason, keypos = 3},
{val = self.level, keypos = 4},
{val = self.action, keypos = 5}
}  
---
-- The old protection templates used an ad-hoc protection category system,
-- with some templates prioritising namespaces in their categories, and
-- others prioritising the protection reason. To emulate this in this module
-- we use the config table cfg.reasonsWithNamespacePriority to set the
-- reasons for which namespaces have priority over protection reason.
-- If we are dealing with one of those reasons, move the namespace table to
-- the end of the order table, i.e. give it highest priority. If not, the
-- reason should have highest priority, so move that to the end of the table
-- instead.
---
table.insert(order, table.remove(order, self.reason and cfg.reasonsWithNamespacePriority[self.reason] and 2 or 3))  
---
-- Define the attempt order. Inactive subtables (subtables with nil "value"
-- fields) are moved to the end, where they will later be given the key
-- "all". This is to cut down on the number of table lookups in
-- cfg.protectionCategories, which grows exponentially with the number of
-- non-nil keys. We keep track of the number of active subtables with the
-- noActive parameter.
---
local noActive, attemptOrder
do
local active, inactive = {}, {}
for i, t in ipairs(order) do
if t.val then
active[#active + 1] = t
else
inactive[#inactive + 1] = t
end
end
noActive = #active
attemptOrder = active
for i, t in ipairs(inactive) do
attemptOrder[#attemptOrder + 1] = t
end
end  
---
-- Check increasingly generic key combinations until we find a match. If a
-- specific category exists for the combination of key fragments we are
-- given, that match will be found first. If not, we keep trying different
-- key fragment combinations until we match using the key
-- "all-all-all-all-all".
---
-- To generate the keys, we index the key subtables using a binary matrix
-- with indexes i and j. j is only calculated up to the number of active
-- subtables. For example, if there were three active subtables, the matrix
-- would look like this, with 0 corresponding to the key fragment "all", and
-- 1 corresponding to other key fragments.
---
-- j 1 2 3
-- i
-- 1 1 1 1
-- 2 0 1 1
-- 3 1 0 1
-- 4 0 0 1
-- 5 1 1 0
-- 6 0 1 0
-- 7 1 0 0
-- 8 0 0 0
---
-- Values of j higher than the number of active subtables are set
-- to the string "all".
---
-- A key for cfg.protectionCategories is constructed for each value of i.
-- The position of the value in the key is determined by the keypos field in
-- each subtable.
---
local cats = cfg.protectionCategories
for i = 1, 2^noActive do
local key = {}