মডিউল:R:en:DAFN

এই মডিউলের জন্য মডিউল:R:en:DAFN/নথি-এ নথিপত্র তৈরি করা হয়ে থাকতে পারে

p = {}

function p.normalize(term)
	term = mw.ustring.lower(term)
	local length = mw.ustring.len(term)
	local i = 1
	local normalized = ""
	a = mw.ustring.codepoint("az", 1)
	z = mw.ustring.codepoint("az", 2)
	while i <= length do
		local x = mw.ustring.codepoint(term, i)
		if a <= x and x <= z then
			normalized = normalized .. mw.ustring.sub(term, i, i)
		end
		i = i + 1
	end
	return normalized
end


function p.page_number(frame)
	local value = p.normalize(frame.args[1])

	first = mw.ustring.sub(value, 1, 1)
	if first < "g" then
		list = require("Module:R:en:DAFN/data1")
	elseif "g" <= first and first <= "n" then
		list = require("Module:R:en:DAFN/data2")
	else
		return ""
	end

    local low = 1
    local high = #list
    local mid = 0
    while high - low > 1 do
        mid = math.floor((low+high)/2)
        local midval = p.normalize(list[mid])
        if midval == value then return mid
        elseif midval < value then low = mid
        elseif midval > value then high = mid - 1
        end
    end

    if p.normalize(list[high]) <= value then return high
    else return low
    end
end

return p