Lihat sumber Modul:If preview

local p = {}
local getArgs = require("Module:Arguments").getArgs
local yn = require("Module:Yesno")
local cfg = mw.loadData('Module:If preview/configuration')

--[[
main

This function returns either the first argument or second argument passed to
this module, depending on whether the page is being previewed.

]]
function p.main(frame)
	local args = getArgs(frame)
	if cfg.preview then
		return args[1] or ''
	else
		return args[2] or ''
	end
end

--[[
pmain

This function returns either the first argument or second argument passed to
this module's parent (i.e. template using this module), depending on whether it
is being previewed.

]]
function p.pmain(frame)
	return p.main(frame:getParent())
end


local function warning_text(warning)
	return mw.ustring.format(
		cfg.warning_infrastructure,
		cfg.templatestyles,
		warning
	)
end

function p._warning(args)
	
	local warning = args[1] and args[1]:match('^%s*(.-)%s*$') or ''
	if warning == '' then
		return warning_text(cfg.missing_warning)
	end
	
	if not cfg.preview then return '' end
	if yn(args['consolewarning']) then mw.addWarning(args[1] or cfg.missing_warning) end
	
	return warning_text(warning)
end

--[[
warning

This function returns a "preview warning", which is the first argument marked
up with HTML and some supporting text, depending on whether the page is being previewed.

disabled since we'll implement the template version in general

]]
--function p.warning(frame)
--	return p._warning(frame.args)
--end

--[[
warning, but for pass-through templates like {{preview warning}}
]]
function p.pwarning(frame)
	local args = getArgs(frame)
	return p._warning(args)
end

--[[
Does both mw.addWarning and preview warning
]]

function p.warn(text)
	if text == nil or text == "" then return "" end
	mw.addWarning(text)
	return p._warning({text})
end

--[[
Console warning
]]
function p.consoleWarning(frame)
	local args = getArgs(frame)
	mw.addWarning(args[1] or cfg.missing_warning)
	return ''
end

return p