Module:Check bibcode

--[[--< B I B C O D E >

Validates (sort of) a bibcode id.

Format for bibcodes is specified here: http://adsabs.harvard.edu/abs_doc/help_pages/data.html#bibcodes

But, this: 2015arXiv151206696F is apparently valid so apparently, the only things that really matter are length, 19 characters and first four digits must be a year. This function makes these tests: length must be 19 characters characters in position 1–4 must be digits and must represent a year in the range of 1000 – next year 5 must be a letter 6–8 must be letter, digit, ampersand, or dot (ampersand cannot directly precede a dot; &. ) 9–18 must be letter, digit, or dot 19 must be a letter or dot

]]

local function bibcode (id) local err_type; local year;

if 19 ~= id:len then err_type = 'length'; else year = id:match ("^(%d%d%d%d)[%a][%w&%.][%w&%.][%w&%.][%w.]+[%a%.]$")	-- if not year then														-- if nil then no pattern match err_type = 'value';													-- so value error else local next_year = tonumber(os.date ('%Y'))+1;						-- get the current year as a number and add one for next year year = tonumber (year);												-- convert year portion of bibcode to a number if (1000 > year) or (year > next_year) then err_type = 'year';												-- year out of bounds end if id:find('&%.') then err_type = 'journal';											-- journal abbreviation must not have '&.' (if it does its missing a letter) end end end

return err_type; end

--[=[-< E N T R Y  P O I N T S >--

This module is mostly a copy of the bibcode validation used in Module:Citation/CS1

call this module with: where is the bibcode

]=]

local function check_bibcode (frame) local err_type = bibcode (mw.text.trim (frame.args[1]));					-- trim leading and trailing white space before evaluation if err_type then return ' Check bibcode: ' .. err_type .. ' (help) '; end return '';																	-- return empty string when bibcode appears to be valid end

----< E X P O R T E D  F U N C T I O N S >--

return { check_bibcode = check_bibcode, }