-- implements template:multiple image
local p = {}  
local autoscaledimages
local nonautoscaledimages  
local function isnotempty(s)
return s and s:match( '^%s*(.-)%s*$' ) ~= ''
end  
local function removepx(s)
return tostring(s or ''):match('^(.*)[Pp][Xx]%s*$') or s
end  
local function getdimensions(s, w, h)
if tonumber(w) and tonumber(h) then
nonautoscaledimages = true
return tonumber(w), tonumber(h)
end
local file = s and mw.title.new('File:' .. mw.uri.decode(mw.ustring.gsub(s,'%|.*$',''), 'WIKI'))
file = file and file.file or {width = 0, height = 0}
w = tonumber(file.width) or 0
h = tonumber(file.height) or 0
autoscaledimages = true
return w, h
end  
local function renderImageCell(image, width, height, link, alt, thumbtime, caption, textalign, istyle, )
local root = mw.html.create('')  
local altstr = '|alt=' .. (alt or '')
local linkstr = link and ('|link=' .. link) or ''
local widthstr = '|' .. tostring(width) .. 'px'
local thumbtimestr = ''  
if widthstr == '|-nanpx' then
widthstr = ''
end
if isnotempty( thumbtime ) then
thumbtimestr = '|thumbtime=' .. thumbtime
end  
local imagediv = root:tag('div')
imagediv:addClass(( ~= 'infobox') and 'thumbimage' or nil)
imagediv:cssText(istyle)
if( height ) then
imagediv:css('height', tostring(height) .. 'px')
imagediv:css('overflow', 'hidden')
end
imagediv:wikitext('')
if isnotempty(caption) then
local captiondiv = root:tag('div')
captiondiv:addClass(( ~= 'infobox') and 'thumbcaption' or nil)
if isnotempty(textalign) then
captiondiv:addClass('text-align-' .. textalign)
end
captiondiv:wikitext(caption)
end
return tostring(root)
end  
local function getWidth(w1, w2)
local w
if isnotempty(w1) then
w = tonumber(w1)
elseif isnotempty(w2) then
w = tonumber(w2)
end
return w or 200
end  
local function getPerRow(pstr, ic)
-- split string into array using any non-digit as a dilimiter
local pr = mw.text.split(pstr or '', '[^%d][^%d]*')
-- if split failed, assume a single row
if (#pr < 1) then
pr = {tostring(ic)}
end
-- convert the array of strings to an array of numbers,
-- adding any implied/missing numbers at the end of the array
local r = 1
local thisrow = tonumber(pr[1] or ic) or ic
local prownum = {}
while( ic > 0 ) do
prownum[r] = thisrow
ic = ic - thisrow
r = r + 1
-- use the previous if the next is missing and
-- make sure we don't overstep the number of images
thisrow = math.min(tonumber(pr[r] or thisrow) or ic, ic)
end
return prownum
end  
local function renderMultipleImages
local pargs = :getParent.args
local args = .args
local width = removepx(pargs['width'] or '')
local dir = pargs['direction'] or ''
local = pargs[*] or args[*] or ''
local align = pargs['align'] or args['align'] or ( == 'infobox' and * or *)
local capalign = pargs['caption_align'] or args['caption_align'] or ''
local totalwidth = removepx(pargs['total_width'] or args['total_width'] or '')
local imgstyle = pargs['image_style'] or args['image_style']
local header = pargs['header'] or pargs['title'] or ''
local footer = pargs['footer'] or ''
local imagegap = tonumber(pargs['image_gap'] or '1') or 1
local perrow = nil
local thumbclass = {
[""] = 'tleft',
[""] = 'tnone',
[""] = 'tnone',
["centre"] = 'tnone',
[""] = 'tright'
}  
-- find all the nonempty images
local imagenumbers = {}
local imagecount = 0
for k, v in pairs( pargs ) do
local i = tonumber(tostring(k):match( '^%s*image([%d]+)%s*$' ) or '0')
if( i > 0 and isnotempty(v) ) then
table.insert( imagenumbers, i)
imagecount = imagecount + 1
end
end  
-- sort the imagenumbers
table.sort(imagenumbers)  
-- create an array with the number of images per row
perrow = getPerRow(dir == 'vertical' and '1' or pargs['perrow'], imagecount)  
-- compute the number of rows
local rowcount = #perrow  
-- store the image widths and compute row widths and maximum row width
local heights = {}
local widths = {}
local widthmax = 0
local widthsum = {}
local k = 0
for r=1,rowcount do
widthsum[r] = 0
for c=1,perrow[r] do
k = k + 1
if( k <= imagecount ) then
local i = imagenumbers[k]
if( isnotempty(totalwidth) ) then
widths[k], heights[k] = getdimensions(pargs['image' .. i], pargs['width' .. i], pargs['height' .. i])
else
widths[k] = getWidth(width, pargs['width' .. i])
end
widthsum[r] = widthsum[r] + widths[k]
end
end
widthmax = math.max(widthmax, widthsum[r])
end  
-- make sure the gap is non-negative
if imagegap < 0 then imagegap = 0 end  
-- if total_width has been specified, rescale the image widths
if( isnotempty(totalwidth) ) then
totalwidth = tonumber(totalwidth)
widthmax = 0
local k = 0
for r=1,rowcount do
local koffset = k
local tw = totalwidth - (3 + imagegap) * (perrow[r] - 1) - 12
local ar = {}
local arsum = 0
for j=1,perrow[r] do
k = k + 1
if( k<= imagecount ) then
local i = imagenumbers[k]
local h = heights[k] or 0
if (h > 0) then
ar[j] = widths[k]/h
heights[k] = h
else
ar[j] = widths[k]/100
end
arsum = arsum + ar[j]
end
end
local ht = tw/arsum
local ws = 0
k = koffset
for j=1,perrow[r] do
k = k + 1
if( k<= imagecount ) then
local i = imagenumbers[k]
widths[k] = math.floor(ar[j]*ht + 0.5)
ws = ws + widths[k]
if heights[k] then
heights[k] = math.floor(ht)
end
end
end
widthsum[r] = ws
widthmax = math.max(widthmax, widthsum[r])
end
end  
-- start building the array of images, if there are images
if( imagecount > 0 ) then
-- compute width of outer div
local bodywidth = 0
for r=1,rowcount do
if( widthmax == widthsum[r] ) then
bodywidth = widthmax + (3 + imagegap) * (perrow[r] - 1) + 12
end
end
-- The body has a min-width of 100, which needs to be taken into account on specific widths
bodywidth = math.max( 100, bodywidth - 8);  
local bg = pargs['background color'] or ''
-- create the array of images
local root = mw.html.create('div')
root:addClass('')
root:addClass('tmulti')
-- root:addClass('tmulti-sandbox')
root:addClass(thumbclass[align] or 'tright')  
if( align == '' or align == 'centre' ) then
root:addClass('')
end
if( bg ~= '' ) then
root:css('background-color', bg)
end  
local div = root:tag('div')
div:addClass(( ~= 'infobox') and 'thumbinner multiimageinner' or 'multiimageinner')
div:css('width', tostring(bodywidth) .. 'px')
:css('max-width', tostring(bodywidth) .. 'px')
if( bg ~= '' ) then
div:css('background-color', bg)
end
if( == 'infobox' or == '') then
div:css(*, *)
end
-- add the header
if( isnotempty(header) ) then
div:tag('div')
:addClass('trow')
:tag('div')
:addClass('theader')
:css('text-align', pargs['header_align'])
:css('background-color',
(pargs['header_background'] ~= '') and pargs['header_background'] or nil)
:wikitext(header)
end
-- loop through the images
local k = 0
for r=1,rowcount do
local rowdiv = div:tag('div'):addClass('trow');
for j=1,perrow[r] do
k = k + 1
if( k <= imagecount ) then
local imagediv = rowdiv:tag('div')
imagediv:addClass('tsingle')
if bg ~= '' then
imagediv:css('background-color', bg);
end
if imagegap > 1 and k < imagecount then
if dir == 'vertical' then
imagediv:css('margin-bottom', tostring(imagegap) .. 'px')
elseif j < perrow[r] then
imagediv:css('margin-', tostring(imagegap) .. 'px')
end
end
local i = imagenumbers[k]
local img = pargs['image' .. i]
local w = widths[k]
imagediv:css('width', tostring(2 + w) .. 'px')
:css('max-width', tostring(2 + w) .. 'px')
imagediv:wikitext(renderImageCell(img, w, heights[k],
pargs['link' .. i], pargs['alt' .. i],
pargs['thumbtime' .. i], pargs['caption' .. i], capalign, imgstyle, ))
end
end
end
-- add the footer
if( isnotempty(footer) ) then
local falign = string.lower(pargs['footer_align'] or args['footer_align'] or '')
falign = (falign == 'centre') and '' or falign
div:tag('div')
:addClass('trow')
:css('display', (falign ~= '') and 'flow-root' or 'flex')
:tag('div')
:addClass(( ~= 'infobox') and 'thumbcaption' or nil)
:css('text-align', (falign ~= '') and falign or nil)
:css('background-color',
(pargs['footer_background'] ~= '') and pargs['footer_background'] or nil)
:wikitext(footer)
end
return tostring(root)
end
return ''
end  
function p.render
autoscaledimages = false
nonautoscaledimages = false