Module:Paramtest

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-- Imported from https://oldschool.runescape.wiki/w/Module:Paramtest
--
-- Meta module to standardize common modifications to incoming parameters
-- Tests basic properties of parameters
--

local p = {}

--
-- Tests if the parameter is empty, all white space, or undefined
--

function p.is_empty(arg)
	return not string.find(arg or '', '%S')
end

--
-- Returns the parameter if it has any content, the default (2nd param)
--

function p.default_to(arg, default)
	if string.find(arg or '', '%S') then
		return arg
	else
		return default
	end
end

--
-- Returns a list of paramaters if it has any content, or the default
--
function p.defaults(...)
	local ret = {}
	for i, v in ipairs(...) do
		if string.find(v[1] or '', '%S') then
			table.insert(ret,v[1])
		else
			-- or false, because nil is removed
			table.insert(ret,v[2] or false)
		end
	end
	return unpack(ret)
end

--
-- Tests if the parameter has content
-- The same as !is_empty, but this is more readily clear
--

function p.has_content(arg)
	return string.find(arg or '', '%S')
end

--
-- uppercases first letter
--

function p.ucfirst(arg)
	if not arg or arg:len() == 0 then
		return nil
	elseif arg:len() == 1 then
		return arg:upper()
	else
		return arg:sub(1,1):upper() .. arg:sub(2)
	end
end

--
-- uppercases first letter, lowercases everything else
--

function p.ucflc(arg)
	if not arg or arg:len() == 0 then
		return nil
	elseif arg:len() == 1 then
		return arg:upper()
	else
		return arg:sub(1,1):upper() .. arg:sub(2):lower()
	end
end

return p