Difference between revisions of "Module:Protection banner"

Revision as of 17:20, 11 March 2014

-- This module implements {{pp-meta}} and its daughter templates such as
-- {{pp-dispute}}, {{pp-vandalism}} and {{pp-sock}}.

local categories = {
	-- The key strings follow this format:
	-- type, level, ns, reason, expiry
	['edit-autoconfirmed-user-all-all'] = 'Wikipedia semi-protected user and user talk pages',
	['edit-autoconfirmed-project-all-all'] = 'Semi-protected project pages',
	['edit-autoconfirmed-file-all-all'] = 'Semi-protected images',
	['edit-autoconfirmed-template-all-all'] = 'Wikipedia semi-protected templates',
	['edit-autoconfirmed-portal-all-all'] = 'Semi-protected portals',
	['edit-autoconfirmed-talk-all-all'] = 'Semi-protected talk pages',
	['edit-autoconfirmed-all-vandalism-all'] = 'Wikipedia pages semi-protected against vandalism',
	['edit-sysop-user-all-all'] = 'Wikipedia protected user and user talk pages',
	['edit-sysop-file-all-all'] = 'Protected images',
	['edit-sysop-project-all-all'] = 'Protected project pages',
	['edit-sysop-template-all-all'] = 'Wikipedia protected templates',
	['edit-sysop-talk-all-all'] = 'Protected talk pages',
	['edit-sysop-all-vandalism-all'] = 'Wikipedia pages protected against vandalism',
	['edit-autoconfirmed-all-dispute-all'] = 'Wikipedia pages semi-protected due to dispute',
	['edit-sysop-all-dispute-all'] = 'Wikipedia pages protected due to dispute',
	['move-sysop-all-dispute-all'] = 'Wikipedia pages move-protected due to dispute',
	['move-sysop-user-all-all'] = 'Wikipedia move-protected user and user talk pages',
	['move-sysop-project-all-all'] = 'Wikipedia move-protected project pages',
	['move-sysop-portal-all-all'] = 'Wikipedia move-protected portals',
	['move-sysop-all-vandalism-all'] = 'Wikipedia pages move-protected due to vandalism',
	['edit-autoconfirmed-template-all-all'] = 'Wikipedia semi-protected templates',
	['move-sysop-template-all-all'] = 'Wikipedia move-protected templates',
	['edit-all-template-all-all'] = 'Wikipedia protected templates',
	['move-sysop-portal-all-all'] = 'Wikipedia move-protected portals',
	['edit-autoconfirmed-all-sock-all'] = 'Wikipedia pages semi-protected from banned users',
	['edit-sysop-all-sock-all'] = 'Wikipedia pages protected from banned users',
	['edit-autoconfirmed-all-blp-temp'] = 'Wikipedia temporarily semi-protected biographies of living people',
	['edit-sysop-all-blp-temp'] = 'Wikipedia temporarily protected biographies of living people',
	['edit-autoconfirmed-all-blp-all'] = 'Wikipedia indefinitely semi-protected biographies of living people',
	['edit-sysop-all-blp-all'] = 'Wikipedia indefinitely protected biographies of living people',
	['edit-autoconfirmed-all-all-indef'] = 'Wikipedia indefinitely semi-protected pages',
	['edit-autoconfirmed-category-all-all'] = 'Wikipedia semi-protected categories',
	['edit-sysop-category-all-all'] = 'Wikipedia protected categories',
	['move-sysop-talk-all-all'] = 'Wikipedia move-protected talk pages',
	['move-sysop-all-all-indef'] = 'Wikipedia indefinitely move-protected pages',
	['edit-autoconfirmed-all-all-all'] = 'Wikipedia semi-protected pages',
	['move-sysop-all-all-all'] = 'Wikipedia move-protected pages',
	['pc-autoconfirmed-all-all-all'] = 'Wikipedia pending changes protected pages (level 1)',
	['pc-reviewer-all-all-all'] = 'Wikipedia pending changes protected pages (level 2)',
	['all-all-all-office-all'] = 'Wikipedia Office-protected pages',
	['all-all-all-all-all'] = 'Wikipedia protected pages',
}

local nskeys = {
	[2] = 'user',
	[3] = 'user',
	[4] = 'project',
	[6] = 'file',
	[10] = 'template',
	[12] = 'project',
	[14] = 'category',
	[100] = 'portal',
}

local behaviors = {
	vandalism = 'namespaceFirst',
	dispute = 'reasonFirst',
	blp = 'reasonFirst',
	sock = 'reasonFirst',
	office = 'reasonFirst',
}

--[[
-- Not currently used
local error_categories = {
	incorrect = 'Wikipedia pages with incorrect protection templates',
	no_expiry = 'Wikipedia protected pages without expiry',
	create = 'Wikipedia pages tagged as create-protected',
	template = 'Wikipedia template-protected pages other than templates and modules'
}
--]]

--------------------------------------------------------------------------------
-- Main functions
--------------------------------------------------------------------------------

-- Define often-used functions as local variables.
local tconcat = table.concat
local tinsert = table.insert
local tremove = table.remove
local ceil = math.ceil

local function toTableEnd(t, pos)
	-- Sends the value at position pos to the end of array t, and shifts the
	-- other items down accordingly.
	return tinsert(t, tremove(t, pos))
end

local p = {}

function p.matchNamespace(ns)
	-- Matches a namespace number to a string that can be passed to the
	-- namespace parameter of p.getCategoryName.
	if not ns or type(ns) ~= 'number' then
		return nil
	end
	local nskey = nskeys[ns]
	if not nskey and ns % 2 == 1 then
			nskey = 'talk'
	end
	return nskey
end

function p.getCategoryName(cats, protType, protLevel, namespace, reason, expiry)
	--[[
	-- Gets a category name from the category table, given a combination of
	-- the protection type, the protection level, the namespace number, the
	-- reason for protection, and the expiry date.
	--]]
	cats = cats or categories

	--[[
	-- Define the initial order to test properties in. The subtable position
	-- is the order the properties will be tested in, and the pos value in
	-- each subtable is the position of the value in the category key.
	--]]
	local properties = {
		{pos = 5, val = expiry},
		{pos = 3, val = p.matchNamespace(namespace)},
		{pos = 4, val = reason},
		{pos = 2, val = protLevel},
		{pos = 1, val = protType}
	}

	--[[
	-- Validate reason, and if it is specified as a "namespaceFirst" reason,
	-- move the namespace subtable to the end of the properties table.
	-- This is necessary to accommodate reasons like "vandalism", as the old
	-- {{pp-vandalism}} template used namespace categories rather than
	-- vandalism categories if they were available.
	--]]
	local behavior
	if not reason then
		behavior = 'reasonFirst'
	else
		behavior = behaviors[reason]
	end
	if behavior == 'namespaceFirst' then
		toTableEnd(properties, 2) -- move namespace to end
	elseif behavior == 'reasonFirst' then
		toTableEnd(properties, 3) -- move reason to end
	else
		error(reason .. ' is not a valid reason')
	end

	--[[
	-- Define the attempt order. Properties with no value defined are moved
	-- to the end, where they will later be given the value "all". This is
	-- to cut down on the number of table lookups in the cats table, which
	-- grows exponentially with the number of properties with valid values.
	-- We keep track of the number of active properties with the noActive
	-- parameter.
	--]]
	local active, inactive = {}, {}
	for i, t in ipairs(properties) do
		if t.val then
			active[#active + 1] = t
		else
			inactive[#inactive + 1] = t
		end
	end
	local noActive = #active
	local attemptOrder = active
	for i, t in ipairs(inactive) do
		attemptOrder[#attemptOrder + 1] = t
	end

	--[[
	-- Check increasingly generic key combinations until we find a match.
	-- If a specific category exists for the combination of properties
	-- we are given, that match will be found first. If not, we keep
	-- trying different key combinations until we match using the key
	-- "all-all-all-all-all".
	--
	-- To generate the keys, we index the property subtables using a
	-- binary matrix with indexes i and j. j is only calculated up to
	-- the number of active properties. For example, if there were three
	-- active properties, the matrix would look like this, with 0
	-- corresponding to the string "all", and 1 corresponding to the
	-- val field in the property table:
	-- 
	--   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 properties are set
	-- to the string "all".
	--
	-- A key for the category table is constructed for each value of i.
	-- The correct position of the value in the key is determined by the
	-- pos field in the property table.
	--]]
	for i = 1, 2^noActive do
		local key = {}
		for j, t in ipairs(attemptOrder) do
			local pos = t.pos
			local val = t.val
			if j > noActive then
				key[pos] = 'all'
			else
				local quotient = i / 2 ^ (j - 1)
				quotient = ceil(quotient)
				if quotient % 2 == 1 then
					key[pos] = val
				else
					key[pos] = 'all'
				end
			end
		end
		key = tconcat(key, '-')
		mw.log(key) -- for debugging
		local attempt = cats[key]
		if attempt then
			return attempt
		end
	end
	error('No category match found; please define the category for key "all-all-all-all-all"')
end

return p