Mô đun:Pagetype

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-- --
-- PAGETYPE --
-- --
-- This is a meta-module intended to replace and similar --
-- templates. It automatically detects namespaces, and allows for a --
-- great deal of customisation. It can easily be ported to other --
-- wikis by changing the values in the Module:Pagetype/config. --
-- --
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-- Load config.
local cfg = mw.loadData('Module:Pagetype/config')

-- Load required modules.
local getArgs = require('Module:Arguments').getArgs
local yesno = require('Module:Yesno')
local nsDetectModule = require('Module:Namespace detect')
local nsDetect = nsDetectModule._main
local getParamMappings = nsDetectModule.getParamMappings
local getPageObject = nsDetectModule.getPageObject

local p = {}

local function shallowCopy(t)
-- Makes a shallow copy of a table.
local ret = {}
for k, v in pairs(t) do
ret[k] = v
end
return ret
end

local function checkPagetypeInput(namespace, val)
-- Checks to see whether we need the default value for the given namespace,
-- and if so gets it from the pagetypes table.
-- The yesno function returns true/false for "yes", "no", etc., and returns
-- val for other input.
local ret = yesno(val, val)
if ret and type(ret) ~= 'string' then
ret = cfg.pagetypes[namespace]
end
return ret
end

local function getPagetypeFromClass(class, param, aliasTable, default)
-- Gets the pagetype from a class specified from the first positional
-- parameter.
param = yesno(param, param)
if param ~= false then -- No check if specifically disallowed.
for _, alias in ipairs(aliasTable) do
if class alias then
if type(param) 'string' then
return param
else
return default
end
end
end
end
end

local function getNsDetectValue(args)
-- Builds the arguments to pass to Module:Namespace detect and returns
-- the result.

-- Get the default values.
local ndArgs = {}
local defaultns = args[cfg.defaultns]
if defaultns == cfg.defaultnsAll then
ndArgs = shallowCopy(cfg.pagetypes)
else
local defaultnsArray
if defaultns == cfg.defaultnsExtended then
defaultnsArray = cfg.extendedNamespaces
elseif defaultns == cfg.defaultnsNone then
defaultnsArray = {}
else
defaultnsArray = cfg.defaultNamespaces
end
for _, namespace in ipairs(defaultnsArray) do
ndArgs[namespace] = cfg.pagetypes[namespace]
end
end

--
-- Add custom values passed in from the arguments. These overwrite the
-- defaults. The possible argument names are fetched from
-- Module:Namespace detect automatically in case new namespaces are
-- added. Although we accept namespace aliases as parameters, we only pass
-- the local namespace name as a parameter to Module:Namespace detect.
-- This means that the "image" parameter can overwrite defaults for the
-- File: namespace, which wouldn't work if we passed the parameters through
-- separately.
--
local mappings = getParamMappings()
for ns, paramAliases in pairs(mappings) do
-- Copy the aliases table, as doesn't work with tables returned from
-- mw.loadData.
paramAliases = shallowCopy(paramAliases)
local paramName = paramAliases[1]
-- Iterate backwards along the array so that any values for the local
-- namespace names overwrite those for namespace aliases.
for i = paramAliases, 1, -1 do
local paramAlias = paramAliases[i]
local ndArg = checkPagetypeInput(paramAlias, args[paramAlias])
if ndArg == false then
-- If any arguments are false, convert them to nil to protect
-- against breakage by future changes to
-- Module:Namespace detect.
ndArgs[paramName] = nil
elseif ndArg then
ndArgs[paramName] = ndArg
end
end
end
-- Check for disambiguation-class and N/A-class pages in mainspace.
if ndArgs.main then
local class = args[1]
if type(class) == 'string' then
-- Put in lower case so e.g. "Dab" and "dab" will both match.
class = mw.ustring.lower(class)
end
local dab = getPagetypeFromClass(
class,
args[cfg.dab],
cfg.dabAliases,
cfg.dabDefault
)
if dab then
ndArgs.main = dab
else
local na = getPagetypeFromClass(
class,
args[cfg.na],
cfg.naAliases,
cfg.naDefault
)
if na then
ndArgs.main = na
end
end
end
-- If there is no talk value specified, use the corresponding subject
-- namespace for talk pages.
if not ndArgs.talk then
ndArgs.subjectns = true
end
-- Add the fallback value. This can also be customised, but it cannot be
-- disabled.
local other = args[cfg.other]
-- We will ignore true/false/nil results from yesno here, but using it
-- anyway for consistency.
other = yesno(other, other)
if type(other) == 'string' then
ndArgs.other = other
else
ndArgs.other = cfg.otherDefault
end
-- Allow custom page values.
ndArgs.page = args.page
return nsDetect(ndArgs)
end

local function detectRedirects(args)
local redirect = args[cfg.redirect]
-- The yesno function returns true/false for "yes", "no", etc., and returns
-- redirect for other input.
redirect = yesno(redirect, redirect)
if redirect == false then
-- Detect redirects unless they have been explicitly disallowed with
-- "redirect=no" or similar.
return
end
local pageObject = getPageObject(args.page)
-- If we are using subject namespaces elsewhere, do so here as well.
if pageObject
and not yesno(args.talk, true)
and args[cfg.defaultns] ~= cfg.defaultnsAll
then
pageObject = getPageObject(
pageObject.subjectNsText .. ':' .. pageObject.text
)
end
-- Allow custom values for redirects.
if pageObject and pageObject.isRedirect then
if type(redirect) == 'string' then
return redirect
else
return cfg.redirectDefault
end
end
end

function p._main(args)
local redirect = detectRedirects(args)
if redirect then
return redirect
else
return getNsDetectValue(args)
end
end

function p.main(frame)
local args = getArgs(frame)
return p._main(args)
end

return p