imported>Uzume: unnecessary

2025-06-25T00:20:44Z

unnecessary

New page

require('strict')
local p = {}

local function blank_to_nil(s)
if s and #s > 0 then return s end
end

local function pad(padlen, ...)
padlen = tonumber(padlen) or 0
if 1 > select('#', ...) then
return ("0"):rep(padlen)
end
local padsrc = tostring((...))
local srclen = mw.ustring.len(padsrc)
if 1 > padlen or 1 > srclen then
return ""
end
return mw.ustring.sub(mw.ustring.rep(padsrc, math.ceil(padlen / srclen)), 1, padlen)
end

local function padleft(str, ...)
str = tostring(str)
if 1 > select('#', ...) then
return str
end
local strlen = mw.ustring.len(str)
if 1 > strlen then
return pad((...), select(2, ...))
end
return pad((tonumber((...)) or 0) - strlen, select(2, ...)) .. str
end

local function padright(str, ...)
str = tostring(str)
if 1 > select('#', ...) then
return str
end
local strlen = mw.ustring.len(str)
if 1 > strlen then
return pad((...), select(2, ...))
end
return str .. pad((tonumber((...)) or 0) - strlen , select(2, ...))
end

local function expr(...)
return mw.ext.ParserFunctions.expr( ... )
end

function p.main(frame)
local args = frame:getParent().args
local id = blank_to_nil(args[1] or args.id)
if not id then
error("Template:LCCN: You must provide an ID.")
end
local title = blank_to_nil(args[2] or args.title or args.name)

local letter_width = (id:match("^%s*[0-9][0-9]") and id:len() < 10) and 0 or 2
local left_part = id:sub(1, letter_width + 2)
local right_part = expr(padright(id, letter_width + 8, '.00000'):sub(letter_width + 3, letter_width + 8))
local url = "https://www.loc.gov/item/" .. left_part .. padleft(right_part, 6, 0)

if args.long == "yes" then
return ("Bibliographic record for [%s %s] at the [[LCCN (identifier)|Library of Congress]]"):format(
url, title or mw.title.getCurrentTitle().text)
end

return ("[[LCCN (identifier)|LCCN]] [%s %s-%s]%s"):format(
url, left_part, right_part, title and (' – ' .. title) or '')
end

return p

Module:LCCN - Revision history

imported>Uzume: unnecessary