Module:Logoform

Lua

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This module is rated as ready for general use. It has reached a mature form and is thought to be bug-free and ready for use wherever appropriate. To reduce server load and bad output, it should be improved by sandbox testing rather than repeated trial-and-error editing.

global function "format"

is invoked from e.g. Created with/layout when

• either the name of the logo starts with U+ or &#
• and/or an iconsize is specified.

1. analize logo: when it contains a dot, it cannot be a codepoint
   no further checks are performed whether is is a valid file name, e.g. "U+2861.svg";
   without a dot it is assumed to be a codepoint, as e.g. ⡡
   no further checks are performed whether is is a valid codepoint,
   but the notation U+ is converted to &#x... and the display becomes tooltipped
2. analize iconsize: when it is missing, useful defaults are set: 33px for Unicode, 36x22px for files
   when it is specified, the absence/presence of the px dimension is verified
3. either the file, or the codepoint is displayed

With other file names and no iconsize, no invocation occurs

Code

--  Module for: Formatting Logo
local p = {}

local concat = table.concat
local split = mw.text.split
local trim = mw.text.trim
local upper = mw.ustring.upper
local sub = mw.ustring.sub

local function ucfirst(s)
	return upper(sub(s, 1, 1)) .. sub(s, 2)
end

function p.format(frame)
	local gpar = frame.args -- global

	local fname = ucfirst(trim(gpar[1] or ''))
	if fname == '' then return '' end -- if file name is "unspecified"

	local size = trim(gpar[2] or '') -- or '0' for "unspecified"
	if size:sub(-2) == 'px' then size = size:sub(1, -3) end -- discard 'px' unit if present
	size = split(size, 'x') -- {width, height} or {height}
	size = size[2] and size[2] or size[1] -- keep only the specified height (in px)

	local style = trim(gpar[3] or '') -- or '-' for "unspecified"
	if	style == '-' then style = '' end

	local title = trim(gpar[4] or '') -- or '' for "unspecified"
	local what = split(fname, '.', true--[[plain, not regexp]]) --[[detect a filename extension]]
	--[[if there's a non-empty part before a supported extension, with 1 to 4 characters: 'jpg', 'jpeg', 'gif', 'png', 'svg', 'webp', 'djvu', 'tif', 'tiff'...]]
	if #what > 1 and #(what[#what]) > 0 and #(what[#what]) < 5 then
		if title == '' then
			title = concat(what, '.', 1, -2):gsub('_', ' ') --[[default title from fname without this extension, underscores replaced by spaces]]
		end
		what = 'F' -- displaying a file
		if size == '' or size == '0' then
			size = '36' --	default file size (in px)
		end
	elseif fname:sub(1, 2) == 'U+' or fname:sub(1, 2) == '&#' then
		what = 'U' -- displaying an Unicode code point instead of a file
		if	size == '' or size == '0' then
			size = '15' -- Unicode default font-size (in px)
		end
		if title == '' then
			title = fname--[[default title]]
		end
		title = trim(title
			:gsub('U%+([0-9A-Fa-f]+) ?', function(x) return 'U+' .. upper(x) .. ' ' end)
			:gsub('&#([0-9A-Fa-f]+);?', function(x) return 'U+' .. upper(x) .. ' ' end))
		fname = fname
			:gsub('&#([0-9A-Fa-f]+);?', function(x) return '&#x' .. upper(x) .. ';' end)
			:gsub('U%+([0-9A-Fa-f]+) ?', function(x) return '&#x' .. upper(x) .. ';' end) .. '&#xFE0F;'--[[Emoji-style variation selector 16]]
	end

	if what == 'F' then -- displaying a file
		if style ~= '' then
			style = '|' .. style
		end
		if title ~= '' then
			title = '|' .. title
				:gsub('%[', '&#91;')
				:gsub('%]', '&#93;')
				:gsub('%|', '&#123;')
		end
		return concat{ '[[File:', fname, '|', size, 'x22px', style--[[allow linking]], title, ']]' }
	else -- displaying an Unicode code point
		if title ~= '' then
			title = concat{ ' title="', title:gsub('"', '&#34;'), '"' }
		end
		return concat{ '<div style="display:inline-block;position:relative;font-size:', size, 'px;line-height:22px;vertical-align:middle;top:-1px', style, '"', title, '>', fname, '</div>' }
	end	
end -- function format

return p