-- This module implements {{gallery}}  local p = {}  local HtmlBuilder = require('Module:HtmlBuilder')  function trim(s)  return (mw.ustring.gsub(s, "^%s*(.-)%s*$", "%1")) end  local function _gallery(args)  local tbl = HtmlBuilder.create('table')   if args.state then  tbl.css('width', '100%')  tbl.addClass('collapsible')  tbl.addClass(args.state)  end   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('th')  .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  local captionstyle = args.captionstyle   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|border|%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', '2px 6px 1px 6px')  .css('overflow-y', 'auto')  .css('margin', '0px')  .css('border', 'none')  .css('border-width', '0px')  .cssText(captionstyle)  .wikitext(caption .. '&nbsp;')  end  end   if args.footer then  tbl  .tag('tr')  .tag('td')  .css('text-align', 'right')  .css('font-size', '80%')  .css('line-height', '1em')  .wikitext(args.footer)  end  if args.perrow then  tbl.css('width', 8 + (cellWidth + 20 + 6)*tonumber(args.perrow) .. 'px')  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