-- This module implements {{gallery}}  local p = {}  function trim(s)     return (mw.ustring.gsub(s, "^%s*(.-)%s*$", "%1")) end  local function _gallery(args)     local tbl = mw.html.create('table')          if args.style then         tbl:cssText(args.style)     else         tbl             :css('background', 'transparent')             :css('border', '1px solid #f0f0f0')             :css('margin-top', '0.5em')     end          if args.align then         tbl:attr('align', args.align)     end          if args.title then         tbl             :tag('tr')                 :tag('td')                     :attr('colspan', 10)                     :css('text-align', 'center')                     :css('font-weight', 'bold')                     :wikitext(args.title)     end          local mainCell = tbl:tag('tr'):tag('td')          local imageCount = math.ceil(#args / 2)     local cellWidth = tonumber(args.cellwidth) or tonumber(args.width) or 180     local imgHeight = tonumber(args.height) or 180     local lines = tonumber(args.lines) or 2          for i = 1, imageCount do         local img = trim(args[i*2 - 1] or '')         local caption = trim(args[i*2] or '')         local imgWidth = tonumber(args['width' .. i]) or tonumber(args.width) or 180         local alt = args['alt' .. i] or ''                  local textWidth         if cellWidth < 30 then             textWidth = imgHeight + 27         else             textWidth = cellWidth + 7         end          if img ~= '' then             local imgTbl = mainCell:tag('table')                          imgTbl                 :css('width', (cellWidth + 20) .. 'px')                 :css('float', 'left')                 :css('border-collapse', 'collapse')                 :css('margin', '3px')                 :tag('tr')                     :tag('td')                         :css('height', (imgHeight + 20) .. 'px')                         :css('border', '1px solid #CCCCCC')                         :css('background-color', '#F8F8F8')                         :css('padding', '0px')                         :css('text-align', 'center')                         :wikitext(mw.ustring.format('[[%s|center|%dx%dpx|alt=%s|%s]]', img, imgWidth, imgHeight, alt, caption))                         :done()                     :done()                 :tag('tr')                     :css('vertical-align', 'top')                     :tag('td')                         :css('display', 'block')                         :css('font-size', '1em')                         :css('height', (0.2 + 1.5*lines) .. 'em')                         :css('padding', '0px')                         :tag('div')                             :addClass('gallerytext')                             :css('height', (0.1 + 1.5*lines) .. 'em')                             :css('width', textWidth .. 'px')                             :css('line-height', '1.3em')                             :css('padding', '9px 6px 1px 6px')                             :css('overflow-y', 'auto')                             :css('margin', '0px')                             :css('border', 'none')                             :css('border-width', '0px')                             :wikitext(caption .. '&nbsp;')         end     end          if args.footer then         tbl             :tag('tr')                 :tag('td')                     :attr('colspan', 10)                     :css('text-align', 'right')                     :css('font-size', '80%')                     :css('line-height', '1em')                     :wikitext(args.footer)     end          return tostring(tbl) end  function p.gallery(frame)     local origArgs     -- If called via #invoke, use the args passed into the invoking template.     -- Otherwise, for testing purposes, assume args are being passed directly in.     if frame == mw.getCurrentFrame() then         origArgs = frame:getParent().args     else         origArgs = frame     end          -- ParserFunctions considers the empty string to be false, so to preserve the previous      -- behavior of {{gallery}}, change any empty arguments to nil, so Lua will consider     -- them false too.     local args = {}     for k, v in pairs(origArgs) do         if v ~= '' then             args[k] = v         end     end      return _gallery(args) end  return p