Module:Optional CSS attribute

Lua

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This module is rated as beta, and is ready for widespread use. It is still new and should be used with some caution to ensure the results are as expected.

Usage

{{#invoke:Optional CSS attribute|optional_CSS_attribute}}

local make_attribute_string = require('Module:Optional CSS attribute').make_attribute_string

Code

--[=[
Simple module to construct a CSS attribute with an undefined number (including zero) of CSS properties
]=]
require('strict')

local p = {} --p stands for package
local getArgs = require('Module:Arguments').getArgs

--[=[
Construct the string from the given table of property:values
]=]
function p.make_attribute_string(attribute, properties)
	if not attribute or not properties or mw.text.trim(attribute) == '' or properties == {} then
		return ''
	end
	attribute = mw.text.trim(attribute)
	
	local out  = ''
	for p, v in pairs(properties) do
		local property = mw.text.trim(p)
		local value = mw.text.trim(v)
		if property ~= attribute and property ~= '' and value ~= '' then
			out = out .. property .. ':' .. value .. ';'
		end
	end
	if properties[attribute] then
		out = out .. mw.text.trim(properties[attribute])
	end
	
	if out == '' then
		return ''
	end
	return attribute .. '="' .. out .. '"'
end

--[=[
The main entry function from templates

Arguments are taken from both frame and parent argument lists
]=]
function p.optional_CSS_attribute(frame)
	local args = getArgs(frame)
	local attribute = args[1] or args.attribute
	args[1] = nil
	args.attribute = nil
	return p.make_attribute_string(attribute, args)
end

return p