# Module:Gallery

-- This module implements  
local p = {}  
local templatestyles = 'Module:Gallery/styles.css'
local yesno = require('Module:Yesno')  
local function trim(s)
return mw.ustring.gsub(mw.ustring.gsub(s, '%s', ' '), '^%s*(.-)%s*$', '%1')
end  
local tracking, preview  
local function checkarg(k,v)
if k and type(k) == 'string' then
if k == 'align' or k == 'state' or k == 'style' or k == 'title' or
k == 'width' or k == 'height' or k == 'lines' or k == 'whitebg' or
k == 'mode' or k == 'footer' or k == 'perrow' or k == 'noborder' or
k:match('^alt%d+$') or k:match('^%d+$') then
-- valid
elseif k == 'captionstyle' then
if not v:match('^text%-align%s*:%s*[;%s]*$') then
table.insert(tracking, '')
end
else
-- invalid
local vlen = mw.ustring.len(k)
k = mw.ustring.sub(k, 1, (vlen < 25) and vlen or 25)
k = mw.ustring.gsub(k, '[^%w\-_ ]', '?')
table.insert(tracking, '')
table.insert(preview, '"' .. k .. '"')
end
end
end  
function p.gallery
-- If called via #invoke, use the args passed into the invoking template.
-- Otherwise, for testing purposes, assume args are being passed directly in.
local origArgs = (type(.getParent) == 'function') and :getParent.args or  
-- ParserFunctions considers the empty string to be false, so to preserve the previous
-- behavior of , change any empty arguments to nil, so Lua will consider
-- them false too.
local args = {}
tracking, preview = {}, {}
for k, v in pairs(origArgs) do
if v ~= '' then
args[k] = v
checkarg(k,v)
end
end  
if (args.mode or *) == 'packed' and (args.align or *) == '' then
args.
end  
local tbl = mw.html.create('div')
tbl:addClass('mod-gallery')  
if args.state then
tbl
:addClass('mod-gallery-collapsible')
:addClass('collapsible')
:addClass(args.state)
end  
if args.style then
tbl:cssText(args.style)
else
tbl:addClass('mod-gallery-default')
end  
if args.align then
tbl:addClass('mod-gallery-' .. args.align:lower)
end  
if args.title then
tbl:tag('div')
:addClass('title')
:tag('div')
:wikitext(args.title)
end  
local gargs = {}
gargs['class'] = 'nochecker' .. (args.noborder and '' or ' bordered-images')
gargs['widths'] = tonumber(args.width) or 180
gargs['heights'] = tonumber(args.height) or 180
gargs['style'] = args.captionstyle
gargs['perrow'] = args.perrow
gargs['mode'] = args.mode
if yesno(args.whitebg or 'yes') then
gargs['class'] = gargs['class'] .. ' whitebg'
end  
local gallery = {}  
local imageCount = math.ceil(#args / 2)  
for i = 1, imageCount do
local img = trim(args[i*2 - 1] or '')
local caption = trim(args[i*2] or '')
local alt = trim(args['alt' .. i] or '')
if img ~= '' then
table.insert(gallery, img .. (alt ~= * and ('|alt=' .. alt) or *) .. '|' .. caption )
end
end  
tbl:tag('div')
:addClass('main')
:tag('div')
:wikitext(
:extensionTag{ name = 'gallery', content = '\n' .. table.concat(gallery,'\n'), args = gargs}  
if args.footer then
tbl:tag('div')
:addClass('footer')
:tag('div')
:wikitext(args.footer)
end  
local trackstr = (#tracking > 0) and table.concat(tracking, *) or *
if #preview > 0 then
trackstr = require('Module:If preview')._warning({
'Unknown parameters ' .. table.concat(preview, '; ') .. '.'
}) .. trackstr
end  
return :extensionTag{ name = 'templatestyles', args = { src = templatestyles} } .. tostring(tbl) .. trackstr
end  
return p