Module:Gallery

-- This module implements {{gallery}}

local p = {}

local templatestyles = 'Template:Gallery/styles.css'

local function trim(s)
	return mw.ustring.gsub(mw.ustring.gsub(s, '%s', ' '), '^%s*(.-)%s*$', '%1')
end

local tracking, preview = '', ''

local function checkarg(k)
	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 == 'mode' or k == 'footer' or k == 'perrow' or
			k:match('^alt%d+$') or k:match('^%d+$') then
			-- valid
		elseif k == 'captionstyle' then
			tracking = tracking .. '[[Category:Pages using gallery with the captionstyle parameter]]'
		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\-_ ]', '?')
			tracking = tracking .. '[[Category:Pages using gallery with unknown parameters|' .. k .. ']]'
			preview = preview .. 'Unknown: "' .. k .. '"<br>'
		end
	end
	return t
end

function p.gallery(frame)
	-- 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(frame.getParent) == 'function') and frame:getParent().args or frame
    
    -- 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
    		checkarg(k)
    	end
	end

	local tbl = mw.html.create('div'):css('display', 'table')
	tbl:addClass('mw-module-gallery')
    
	if args.state then
		tbl
			:css('width', '100%')
			:addClass('collapsible')
			:addClass(args.state)
	end
	
	if args.style then
		tbl:cssText(args.style)
	else
		tbl
			:css('background', 'transparent')
			:css('margin-top', '0.5em')
	end
	
	if args.align then
		if args.align == 'center' then
			tbl
				:css('margin-left', 'auto')
				:css('margin-right', 'auto')
		else
			tbl:css('float', args.align)
		end
	end
	
	if args.title then
		tbl
			:tag('div'):css('display', 'table-row')
				:tag('div'):css('display', 'table-cell')
					:css('text-align', 'center')
					:css('font-weight', 'bold')
					:wikitext(args.title)
	end
	
	local gargs = {}
	gargs['class'] = 'nochecker bordered-images'
	gargs['widths'] = tonumber(args.width) or 180
	gargs['heights'] = tonumber(args.height) or 180
	gargs['style'] = 'line-height:130%;' .. (args['captionstyle'] or '')
	gargs['perrow'] = args.perrow
	gargs['mode'] = args.mode
	
	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')
		:css('display', 'table-row')
		:tag('div')
			:css('display', 'table-cell')
			:wikitext(
				frame:extensionTag{ name = 'gallery', content = '\n' .. table.concat(gallery,'\n'), args = gargs}
				)
    
	if args.footer then
		tbl
			:tag('div'):css('display', 'table-row')
				:tag('div'):css('display', 'table-cell')
					:css('text-align', 'right')
					:css('font-size', '80%')
					:css('line-height', '1em')
					:wikitext(args.footer)
	end

	if preview ~= '' then
		if frame:preprocess( "{{REVISIONID}}" ) == "" then
			tracking = preview
		end
	end
	
	return frame:extensionTag{ name = 'templatestyles', args = { src = templatestyles} } .. tostring(tbl) .. tracking
end

return p
Tracking categories
