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--
-- Tests basic properties of parameters
--
 
local p = {}
 
--
-- Tests if the parameter is empty, all white space, or undefined
--
 
function p.is_empty( arg )
	if not arg or not arg:find('%S') then
		return true
	end
 
	return false
end
 
--
-- Returns the parameter if it has any content, the default (2nd param)
--
 
function p.default_to(param, default)
	if param and param:find('%S') then
		return param
	else
		return default
	end
end
 
--
-- Tests if the parameter has content
-- The same as !is_empty, but this is more readily clear
--
 
function p.has_content( arg )
	if not arg or not arg:find('%S') then
		return false
	end
 
	return true
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

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