Module:Category handler: Difference between revisions

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Module:Category handler (view source)

Revision as of 09:36, July 1, 2013

6,581 bytes added ,  10 years ago
add the rest of the features, improve the comments
(add blacklist check)
(add the rest of the features, improve the comments)
Line 1:
----------------------------------------------------------------------
-- Configuration data.
-- --
-- CATEGORY HANDLER --
-- --
-- This module implements the {{category handler}} template --
-- in Lua, with a few improvements: all namespaces and all --
-- namespace aliases are supported, and namespace names are --
-- detected automatically for the local wiki. This module --
-- requires [[Module:Namespace detect]] to be available on --
-- the local wiki. It can be configured for different wikis --
-- by altering the values in the "cfg" table. --
-- --
----------------------------------------------------------------------
 
----------------------------------------------------------------------
-- Configuration data --
-- Language-specific parameter names and values can be set --
-- here. --
----------------------------------------------------------------------
 
local cfg = {}
 
-- cfg.nocat is the parameter name to suppress categorisation.
-- cfg.nocatTrue is the value to suppress categorisation, and
-- cfg.nocatFalse is the value to both categorise and to skip the
-- blacklist check.
cfg.nocat = 'nocat'
cfg.nocatTrue = 'true'
cfg.nocatFalse = 'false'
 
-- The parameter name for the legacy "categories" parameter.
cfg.categories = 'categories'
cfg.subpagecategoriesYes = 'subpageyes'
 
cfg.page = 'page'
-- The parameter name for the legacy "category2" parameter. This
-- skips the blacklist if set to the cfg.category2Yes value, and
-- suppresses categorisation if present but equal to anything other
-- than cfg.category2Yes.
cfg.category2 = 'category2'
cfg.category2Yes = 'yes'
 
-- cfg.subpage is the parameter name to specify how to behave on
-- subpages. cfg.subpageNo is the value to specify to not
-- categorise on subpages; cfg.only is the value to specify to only
-- categorise on subpages.
cfg.subpage = 'subpage'
cfg.subpageNo = 'no'
cfg.subpageOnly = 'only'
 
-- The parameter for data to return in all namespaces.
cfg.all = 'all'
 
cfg.main = 'main'
-- The parameter name for data to return if no data is specified for
-- the namespace that is detected. This must be the same as the
-- cfg.other parameter in [[Module:Namespace detect]].
cfg.other = 'other'
 
-- The parameter name used to specify a page other than the current
-- page; used for testing and demonstration. This must be the same
-- as the cfg.page parameter in [[Module:Namespace detect]].
cfg.page = 'page'
 
-- The categorisation blacklist. Pages that match Lua patterns in this
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}
 
-- This is a table of namespaces to categorise by default.
-- Module start.
cfg.defaultNamespaces = {
0, -- Main
6, -- File
12, -- Help
14 -- Category
}
 
----------------------------------------------------------------------
-- End configuration data --
----------------------------------------------------------------------
 
-- Get dependent modules and declare the table of functions that we will
-- return.
local NamespaceDetect = require('Module:Namespace detect')
local p = {}
local args = {}
 
----------------------------------------------------------------------
-- Get the page object. This will return the page object for the page
-- Local functions --
-- specified, or nil if there are errors in the title or if the
-- The following are internal functions, which we do not want --
-- expensive function count has been exceeded.
-- to be accessible from other modules. --
local function getPageObject()
----------------------------------------------------------------------
-- Get the title object for args.page if it is specified. Otherwise
-- get the title object for the current page.
if args[cfg.page] then
-- Get the page object, passing the function through pcall
-- in case we are over the expensive function count limit.
local noError, pageObject = pcall(mw.title.new, args[cfg.page])
if not noError then
return nil
else
return pageObject
end
else
return mw.title.getCurrentTitle()
end
end
 
-- Find whether we need to return a category or not.
local function needsCategory( pageObject, args )
if-- notIf there is no pageObject available, then returnthat either means that we are endover
-- the expensive function limit or that the title specified was invalid. Invalid
if args[cfg.nocat] == 'true'
-- titles will probably only be a problem during testing, so choose the best
or ( args[cfg.category2] and args[cfg.category2] ~= 'yes' )
-- default for being over the expensive function limit, i.e. categorise the page.
or ( args[cfg.subpage] == 'no' and pageObject.isSubpage )
or ( args[cfg.subpage] == 'only' andif not pageObject.isSubpage )then then
return true
end
-- Only categorise if the relevant options are set.
if args[cfg.nocat] == cfg.nocatTrue
or ( args[cfg.category2] and args[cfg.category2] ~= cfg.category2Yes )
or ( args[cfg.subpage] == cfg.subpageNo and pageObject.isSubpage )
or ( args[cfg.subpage] == cfg.subpageOnly and not pageObject.isSubpage ) then
return false
else
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-- Find whether we need to check the blacklist or not.
local function needsBlacklistCheck( args )
if args[cfg.nocat] == 'false'cfg.nocatFalse
or args[cfg.categories] == 'yes'cfg.categoriesYes
or args[cfg.category2] == 'yes'cfg.category2Yes then
return false
else
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-- string searched is the namespace plus the title, including subpages.
-- Returns true if there is a match, otherwise returns false.
local function findBlacklistMatch( pageObject )
if not pageObject then return end
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end
 
-- Find whether any namespace parameters have been specified.
local function _main()
-- Mappings is the table of parameter mappings taken from
local pageObject = getPageObject()
-- [[Module:Namespace detect]].
if not needsCategory( pageObject ) then return end
local function nsParamsExist( mappings, args )
if needsBlacklistCheck() then
if args[cfg.all] or args[cfg.other] then
return findBlacklistMatch( pageObject )
return true
end
for ns, params in pairs( mappings ) do
for i, param in ipairs( params ) do
if args[param] then
return true
end
end
end
return false
end
 
-- The main structure of the module. Checks whether we need to categorise,
-- Process the arguments.
-- and then passes the relevant arguments to [[Module:Namespace detect]].
function p.main(frame)
local function _main( args )
-- Get the page object and argument mappings from
-- [[Module:Namespace detect]], to save us from having to rewrite the
-- code.
local pageObject = NamespaceDetect.getPageObject()
local mappings = NamespaceDetect.getParamMappings()
-- Check if we need a category or not, and return nothing if not.
if not needsCategory( pageObject, args ) then return end
local ret = '' -- The string to return.
if needsBlacklistCheck( args ) and not findBlacklistMatch( pageObject ) then
if not nsParamsExist( mappings, args ) then
-- No namespace parameters exist; basic usage.
local ndargs = {}
for _, nsid in ipairs( cfg.defaultNamespaces ) do
ndargs[ mw.ustring.lower( mw.site.namespaces[ nsid ].name ) ] = args[1]
end
ndargs.page = args.page
local ndresult = NamespaceDetect.main( ndargs )
if ndresult then
ret = ret .. ndresult
end
else
-- Namespace parameters exist; advanced usage.
-- If the all parameter is specified, return it.
if args.all then
ret = ret .. args.all
end
-- Get the arguments to pass to [[Module:Namespace detect]].
local ndargs = {}
for ns, params in pairs( mappings ) do
for _, param in ipairs( params ) do
ndargs[param] = args[param] or args[cfg.other] or nil
end
end
if args.other then
ndargs.other = args.other
end
if args.page then
ndargs.page = args.page
end
local data = NamespaceDetect.main( ndargs )
-- Work out what to return based on the result of the namespace
-- detect call.
local datanum = tonumber( data )
if type( datanum ) == 'number' then
-- "data" is a number, so return that positional parameter.
-- Remove non-positive integer values, as only positive integers
-- from 1-10 were used with the old template.
if datanum > 0
and math.floor( datanum ) == datanum
and args[datanum] then
ret = ret .. args[ datanum ]
end
else
-- "data" is not a number, so return it as it is.
if type(data) == 'string' then
ret = ret .. data
end
end
end
end
return ret
end
 
----------------------------------------------------------------------
-- Global functions --
-- The following functions are global, because we want them --
-- to be accessible from #invoke and from other Lua modules. --
-- At the moment only the main function is here. It processes --
-- the arguments and passes them to the _main function. --
----------------------------------------------------------------------
 
function p.main( frame )
-- If called via #invoke, use the args passed into the invoking
-- template, or the args passed to #invoke if any exist. Otherwise
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origArgs = frame
end
-- The following don't need blank values preserved:
-- nocat
-- categories
-- subpage
-- page
-- positional parameters (1-10)
-- The following *do* need blank values preserved
-- category2
-- all
-- other
-- main
-- all the namespace parameters
 
-- Trim whitespace and remove blank arguments for the following args:
-- 1, 2, 3 etc., "nocat", "categories", "subpage", and "page".
local args = {}
for k, v in pairs(origArgs) do
for k, v in pairs( origArgs ) do
v = mw.text.trim(v) -- Trim whitespace.
if type(k) == 'number'
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end
-- Lower-case "nocat", "categories", "category2", and "subpage". These
-- parameters are put in lower case whenever they appear in the old
-- template, so we can just do it once here and save ourselves some work.
local lowercase = { cfg.nocat, cfg.categories, cfg.category2, cfg.subpage }
for _, v in ipairs( lowercase ) do
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end
return _main( args )
end
 
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