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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 "" )
	if string.find(s, "^%[%[[^|]+|[^%]]+%]%]") then
		-- this is a piped wikilink, so we capitalise the text, not the pipe
		local b, c = string.find(s, "|%A*%a") -- find the first letter after the pipe
		return string.sub(s, 1, c-1) .. string.upper(string.sub(s, c, c)) .. string.sub(s, c+1)
	end
	local letterpos = string.find(s, '%a')
	if letterpos then
		local first = string.sub(s, 1, letterpos - 1)
		local letter = string.sub(s, letterpos, letterpos)
		local rest = string.sub(s, letterpos + 1)
		return first .. string.upper(letter) .. string.lower(rest)
	else
		return s
	end
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

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