# Module:Collapsible list

local p = {}  
local function gettitlestyletracking( ts )
if not ts then return '' end
ts = mw.ustring.gsub(mw.ustring.lower(ts), '%s', '')
local tsvals = mw.text.split(ts, ';')
table.sort(tsvals)
local skey = table.concat(tsvals,';')
skey = mw.ustring.gsub(skey, '^;', '')
skey = mw.text.encode(mw.text.encode(skey),'%c%[%]=')
if (mw.ustring.match(';' .. ts, ';background:') or mw.ustring.match(';' .. ts, ';background%-color:'))
and mw.ustring.match(';' .. ts, ';text%-align:') then
return ''
end
return ''
end  
local function getListItem( data )
if not type( data ) == 'string' then
return ''
end
return mw.ustring.format( '<li>%s</li>', data )
end  
-- Returns an array containing the keys of all positional arguments
-- that contain data (i.e. non-whitespace values).
local function getArgNums( args )
local nums = {}
for k, v in pairs( args ) do
if type( k ) == 'number' and
k >= 1 and
math.floor( k ) == k and
type( v ) == 'string' and
mw.ustring.match( v, '%S' ) then
table.insert( nums, k )
end
end
table.sort( nums )
return nums
end  
-- Formats a list of classes, styles or other attributes.
local function formatAttributes( attrType, ... )
local attributes = { ... }
local nums = getArgNums( attributes )
local t = {}
for i, num in ipairs( nums ) do
table.insert( t, attributes[ num ] )
end
if #t == 0 then
return '' -- Return the blank string so concatenation will work.
end
return mw.ustring.format( ' %s="%s"', attrType, table.concat( t, ' ' ) )
end  
-- TODO: use Module:List. Since the update for this comment is routine,
-- this is blocked without a consensus discussion by
-- MediaWiki_talk:Common.css/Archive_15#plainlist_+_hlist_indentation
-- if we decide hlist in plainlist in this template isn't an issue, we can use
-- module:list directly
---
-- is an implementation (that will code rot slightly I expect)
local function buildList( args )
-- Get the list items.
local listItems = {}
local argNums = getArgNums( args )
for i, num in ipairs( argNums ) do
table.insert( listItems, getListItem( args[ num ] ) )
end
if #listItems == 0 then
return ''
end
listItems = table.concat( listItems )  
-- hack around mw-collapsible show/hide jumpiness by looking for text-alignment
-- by setting a margin if centered
local textAlignmentCentered = 'text%-align%s*:%s*'
local centeredTitle = (args.title_style and args.title_style:lower:match(textAlignmentCentered)
or args.titlestyle and args.titlestyle:lower:match(textAlignmentCentered))
local centeredTitleSpacing
if centeredTitle then
centeredTitleSpacing = 'margin: 0 4em'
else
centeredTitleSpacing = ''
end  
-- Get class, style and title data.
local collapsibleContainerClass = formatAttributes(
'class',
'collapsible-list',
'mw-collapsible',
not args.expand and 'mw-collapsed'
local collapsibleContainerStyle = formatAttributes(
'style',
-- mostly work around .infobox-full-data defaulting to centered
'text-align: ;',
args.frame_style,
args.framestyle
local collapsibleTitleStyle = formatAttributes(
'style',
'line-height: 1.6em; font-weight: bold;',
args.title_style,
args.titlestyle
local jumpyTitleStyle = formatAttributes(
'style',
centeredTitleSpacing
local title = args.title or 'பட்டியல்'
local ulclass = formatAttributes( 'class', 'mw-collapsible-content', args.hlist and 'hlist' )
local ulstyle = formatAttributes(
'style',
'margin-top: 0; margin-bottom: 0; line-height: inherit;',
not args.bullets and 'list-style: ; margin-: 0;',
args.list_style,
args.liststyle  
local hlist_templatestyles = ''
if args.hlist then
hlist_templatestyles = mw.getCurrentFrame:extensionTag{
name = 'templatestyles', args = { src = 'Hlist/styles.css' }
}
end  
-- Build the list.
return mw.ustring.format(
'%s<div%s%s>\n<div%s><div%s>%s</div></div>\n<ul%s%s>%s</ul>\n</div>',
hlist_templatestyles, collapsibleContainerClass, collapsibleContainerStyle,
collapsibleTitleStyle, jumpyTitleStyle, title, ulclass, ulstyle, listItems
) .. gettitlestyletracking(args.title_style or args.titlestyle)
end  
function p.main
local origArgs
if == mw.getCurrentFrame then
origArgs = :getParent.args
for k, v in pairs( .args ) do
origArgs = .args
break
end
else
origArgs =
end  
local args = {}
for k, v in pairs( origArgs ) do
if type( k ) == 'number' or v ~= '' then
args[ k ] = v
end
end
return buildList( args )
end  
return p