Module:String2

Documentation for this module may be created at Module:String2/doc

local p = {}

p.upper = function( frame )
	local s = mw.text.trim( frame.args[1] or "" )
	return string.upper( s )
end

p.lower = function( frame )
	local s = mw.text.trim( frame.args[1] or "" )
	return string.lower( s )
end

p.sentence = function (frame )
	local s =  mw.text.trim( frame.args[1] or "" )
	local strFirst = string.sub( s, 1, 1 )
	local strRest = string.sub( s, 2 )
	return string.upper( strFirst ) .. string.lower( strRest )
end

p.title = function (frame )
	-- http://grammar.yourdictionary.com/capitalization/rules-for-capitalization-in-titles.html
	-- recommended by The U.S. Government Printing Office Style Manual:
	-- "Capitalize all words in titles of publications and documents,
	-- except a, an, the, at, by, for, in, of, on, to, up, and, as, but, or, and nor."
	local alwayslower = {['a'] = 1, ['an'] = 1, ['the'] = 1, 
		['and'] = 1, ['but'] = 1, ['or'] = 1, ['for'] = 1,
		['nor'] = 1, ['on'] = 1, ['in'] = 1, ['at'] = 1, ['to'] = 1,
		['from'] = 1, ['by'] = 1, ['of'] = 1, ['up'] = 1 }
	local res = ''
	local s =  mw.text.trim( frame.args[1] or "" )
	local words = mw.text.split( s, " ")
	for i, s in ipairs(words) do
		s = string.lower( s )
		if( i > 1 ) then
			if( alwayslower[s] ~= 1 ) then
				s = mw.getContentLanguage():ucfirst(s)
			end
		else
			s = mw.getContentLanguage():ucfirst(s)
		end
		words[i] = s
	end
	return table.concat(words, " ")
end

return p