View source for Module:Citation/CS1

--require "mw.text"

local z = {
    wikitext = require "Module:Wikitext"
}

function hideinprint(content)
    return content
end

function onlyinprint(content)
    return ""
end

function nowiki(frame, content)
    return mw.text.tag({name="nowiki",contents=content,params={}}, frame)
end

function externallinkid(frame, args)
    local sep = args.separator or "&nbsp;"
    args.suffix = args.suffix or ""
    local t0 = onlyinprint(args.label .. sep .. args.id)
    local t1 = hideinprint("[[" .. args.link .. "|" .. args.label .. "]]" .. sep .. "[" .. args.prefix .. mw.url.encode(args.id) .. args.suffix .. " " .. nowiki(frame, args.id) .. "]")
    return t0 .. t1
end

function internallinkid(frame, args)
    local sep = args.separator or "&nbsp;"
    args.suffix = args.suffix or ""
    local t0 = onlyinprint(args.label .. sep .. args.id)
    local t1 = hideinprint("[[" .. args.link .. "|" .. args.label .. "]]" .. sep .. "[[" .. args.prefix .. args.id .. args.suffix .. "|" .. nowiki(frame, args.id) .. "]]")
    return t0 .. t1
end

function amazon(frame, id, domain)
    if ( nil == domain ) then 
        domain = "com"
    elseif ( "jp" == domain or "uk" == domain ) then
        domain = "co." .. domain
    end
    return externallinkid(frame, {link="Amazon Standard Identification Number",label="ASIN",prefix="//www.amazon."..domain.."/dp/",id=id})
end

function doi(frame, id, broken, inactive, nocat)
    local text = externallinkid(frame, {link="Digital object identifier",label="doi",prefix="http://dx.doi.org/",id=id,separator=":"})
    local cat = ""
    if ( inactive ~= nil ) then 
        inactive = " (inactive " .. inactive .. ")" 
        cat = cat .. "[[Category:Pages with DOIs inactive since " .. z.wikitext.canonicalcleanuptime(inactive) .. "]]"
    else 
        inactive = "" 
    end
    if ( string.sub(id,1,3) ~= "10." ) then
        cat = cat .. "[[Category:Pages with DOI errors]]"
    end
    if ( nocat and nocat ~= "" ) then cat = "" end
    return text .. inactive .. cat    
 end

function url(frame, id)
    local t0 = onlyinprint(id)
    local t1 = hideinprint("[" .. id .. " " .. nowiki(frame, id) .. "]")
    return t0 .. t1
end

function openlibrary(frame, id)
    local cat = ""
    local prefix = ""
    local code = id:sub(-1,-1)
    if ( code == "A" ) then
        prefix = "http://openlibrary.org/authors/OL"
    elseif ( code == "M" ) then
        prefix = "http://openlibrary.org/books/OL"
    elseif ( code == "W" ) then
        prefix = "http://openlibrary.org/works/OL"
    else
        prefix = "http://openlibrary.org/OL"
        cat = cat .. "[[Category:Pages with OL errors]]"
    end
    local text = externallinkid(frame, {link="Open Library",label="OL",prefix=prefix,id=id})
    return text .. cat
end

function reducetoinitials(first)
    local initials = {}
    for word in string.gmatch(first, "%S+") do
        table.insert(initials, string.sub(word,1,1)) -- Vancouver format does not include full stops.
    end
    return table.concat(initials) -- Vancouver format does not include spaces.
end

function listpeople(control, people)
    local sep = control.sep
    local namesep = control.namesep
    local format = control.format
    local maximum = control.maximum
    local text = {}
    for i,person in ipairs(people) do
        if (person.last ~= nil) then
            local mask = person.mask
            local one
            if ( maximum ~= nil and i == maximum + 1 ) then
                one = "et al."
            elseif ( maximum ~= nil and i > maximum + 1 ) then
                break
            elseif (mask ~= nil) then
                local n = tonumber(mask)
                if (n ~= nil) then
                    one = string.rep("&mdash;",n)
                else
                    one = mask
                end
            else
                one = person.last
                local first = person.first
                if (first ~= nil) then 
                    if ( "vanc" == format ) then first = reducetoinitials(first) end
                    one = one .. namesep .. first 
                end
                if (person.link ~= nil) then one = "[[" .. person.link .. "|" .. one .. "]]" end
            end
            table.insert(text, one)
        end
    end
    local result = table.concat(text, sep) -- construct list
    if ( "scap" == format ) then result= mw.text.tag({name="span", contents=result, params={class="smallcaps", style="font-variant:small-caps;"}}) end -- if necessary wrap result in <span> tag to format in Small Caps
    return result
end

function anchorid(args)
    local P1 = args[1] or ""
    local P2 = args[2] or ""
    local P3 = args[3] or ""
    local P4 = args[4] or ""
    local P5 = args[5] or ""
    return "CITEREF" .. P1 .. P2 .. P3 .. P4 .. P5
end

function refid(args)
    local p = args.p or ""
    local pp = args.pp or ""
    local loc = args.loc or ""
    return anchorid(args) .. p .. pp .. loc    
end

function name(args)
    local P1 = args[1] or ""
    if ( args[5] ~= nil) then
        return P1 .. " et al."
    else
        local P2 = args[2] or ""
        local P3 = args[3] or "" 
        local P4 = args[4] or ""
        if ( args[4] ~= nil ) then
            P4 = " " .. P4
            P3 = ", & " .. P3
            P2 = ", " .. P2
        elseif ( args[3] ~= nil ) then
            P3 = " " .. P3
            P2 = " & " .. P2
        elseif ( args[2] ~= nil ) then
            P2 = " " .. P2            
        end
        return P1 .. P2 .. P3 .. P4
    end 
end

function crossref(frame, args)
    local config = frame.args -- the arguments passed BY the template, in the wikitext of the template itself
    local LB = config.BracketLeft or ""
    local RB = config.BracketRight or ""
    local anchor = args.ref or args.Ref or anchorid(args)
    local text = name(args)
    local loc = args.loc
    local page = args.p or args.page
    local pages = args.pp or args.pages
    if nil == loc then loc = "" else loc = " " .. loc end
    if ( page ~= nil ) then
        local pagesep = config.PageSep or ", p. "
        loc = loc .. pagesep .. page
    end
    if ( pages ~= nil ) then
        local pagessep = config.PagesSep or ", pp. "
        loc = loc .. pagessep .. pages
    end        
    local pagename = args.pagename or ""
    local ps = args.Postscript or ""
    return LB .. "[[" .. pagename .. "#" .. anchor .. "|" .. text .. "]]" .. loc .. RB .. ps
end

function extractauthor(args, i)
    local last = args["author" .. i .. "-last"] or args["author-last" .. i] or args["last" .. i] or args["surname" .. i] or args["Author" .. i] or args["author" .. i]
    if ( nil == last ) then return nil end
    return {
        last = last,
        first = args["author" .. i .. "-first"] or args["author-first" .. i] or args["first" .. i] or args["given" .. i],
        link = args["author" .. i .. "-link"] or args["author-link" .. i] or args["author" .. i .. "link"] or args["authorlink" .. i],
        mask = args["author" .. i .. "-mask"] or args["author-mask" .. i] or args["author" .. i .. "mask"] or args["authormask" .. i]
    }
end

function extracteditor(args, i)
    local last = args["editor" .. i .. "-last"] or args["editor-last" .. i] or args["EditorSurname" .. i] or args["Editor" .. i] or args["editor" .. i]
    if ( nil == last ) then return nil end
    return {
        last = last,
        first = args["editor" .. i .. "-first"] or args["editor-first" .. i] or args["EditorGiven" .. i],
        link = args["editor" .. i .. "-link"] or args["editor-link" .. i] or args["editor" .. i .. "link"] or args["editorlink" .. i],
        mask = args["editor" .. i .. "-mask"] or args["editor-mask" .. i] or args["editor" .. i .. "mask"] or args["editormask" .. i]
    }
end

function citation0(frame, args)
    local config = frame.args -- the arguments passed BY the template, in the wikitext of the template itself
    
    local PPrefix = config.PPrefix or "p."
    local PPPrefix = config.PPPrefix or "pp."
    if ( nil ~= args.nopp ) then PPPrefix = "" PPrefix = "" end
    
    -- Transfer unnumbered arguments to numbered arguments if necessary.
    args["author1"] = args["author1"] or args["author"]
    args["author1-last"] = args["author1-last"] or args["author-last"] or args["last"]
    args["author1-first"] = args["author1-first"] or args["author-first"] or args ["first"]
    args["author1-link"] = args["author1-link"] or args["author-link"]
    args["author1-mask"] = args["author1-mask"] or args["author-mask"]
    args["author1link"] = args["author1link"] or args["authorlink"]    
    args["editor1"] = args["editor1"] or args["editor"]
    args["editor1-last"] = args["editor1-last"] or args["editor-last"]
    args["editor1-first"] = args["editor1-first"] or args["editor-first"]
    args["editor1-link"] = args["editor1-link"] or args["editor-link"]
    args["editor1-mask"] = args["editor1-mask"] or args["editor-mask"]
    args["editor1link"] = args["editor1link"] or args["editorlink"]    

    -- Pick out the relevant fields from the arguments.  Different citation templates define different field names for the same underlying things.    
    local Authors = args.authors
    local i 
    local a = {}
    i = 1
    while true do
        a[i] = extractauthor(args, i)
        if ( nil == a[i]) then break end
        i = i + 1
    end
    local Coauthors = args.coauthors or args.coauthor 
    local Others = args.others 
    local EditorMask = args.editormask or args["editor-mask"]
    local EditorFormat = args["editor-format"] or args.editorformat
    local Editors = args.editors
    local e = {} 
    i = 1
    while true do
        e[i] = extracteditor(args, i)
        if ( nil == e[i]) then break end
        i = i + 1
    end
    local Year = args.year 
    local PublicationDate = args.publicationdate
    local OrigYear = args.origyear
    local Date = args.date
    local LayDate = args.laydate
    local Title = args.title or args.encyclopaedia or args.encyclopedia or args.dictionary
    local BookTitle = args.booktitle
    local Conference = args.conference
    local TransTitle = args.trans_title
    local TitleNote = args.department
    local TitleLink = args.titlelink or args.episodelink
    local Chapter = args.chapter or args.article or args.entry
    local ChapterLink = args.chapterlink
    local TransChapter = args["trans-chapter"] or args.trans_chapter
    local TitleType = args.type
    local ArchiveURL = args["archive-url"] or args.archiveurl
    local URL = args.url
    local ChapterURL = args["chapter-url"] or args.chapterurl
    local ConferenceURL = args["conference-url"] or args.conferenceurl
    local Periodical = args.journal or args.newspaper or args.magazine or args.work or args.periodical or args.encyclopedia or args.encyclopaedia
    local Series = args.series or args.version
    local Volume = args.volume
    local Issue = args.issue or args.number
    local Position = nil
    local Page = args.page
    local Pages = args.pages
    local PP = args.pp
    local At = args.at
    local Edition = args.edition
    local PublicationPlace = args["publication-place"] or args.publicationplace or args.place or args.location
    local PublisherName = args.publisher
    local SubscriptionRequired = args.subscription
    local Via = args.via
    local AccessDate = args["access-date"] or args.accessdate
    local ArchiveDate = args["archive-date"] or args.archivedate
    local DeadURL = args.deadurl
    local Language = args.language or args["in"]
    local Format = args.format
    local Ref = args.ref or args.Ref
    local ARXIV = args.arxiv or args.ARXIV
    local ASIN = args.asin or args.ASIN 
    local ASINTLD = args["ASIN-TLD"]
    local BIBCODE = args.bibcode or args.BIBCODE
    local DOI = args.doi or args.DOI
    local DoiBroken = args.doi_inactivedate or args.doi_brokendate or args.DoiBroken
    local ID = args.id or args.ID
    local ISBN = args.isbn13 or args.isbn or args.ISBN
    local ISSN = args.issn or args.ISSN
    local JFM = args.jfm or args.JFM
    local JSTOR = args.jstor or args.JSTOR
    local LCCN = args.lccn or args.LCCN
    local MR = args.mr or args.MR
    local OCLC = args.oclc or args.OCLC
    local OL = args.ol or args.OL
    local OSTI = args.osti or args.OSTI
    local PMC = args.pmc or args.PMC
    local PMID = args.pmid or args.PMID
    local RFC = args.rfc or args.RFC
    local SSRN = args.ssrn or args.SSRN
    local ZBL = args.zbl or args.ZBL
    local Quote = args.quote or args.quotation
    local PostScript = args.postscript
    local LaySummary = args.laysummary
    local LaySource = args.laysource
    local Transcript = args.transcript
    local TranscriptURL = args["transcript-url"] or args.transcripturl

    -- At this point fields may be nil if they weren't specified in the template use.  We can use that fact.
    
    -- Account for the oddity that is {{cite conference}}, before generation of COinS data.
    if ( BookTitle ) then
        Chapter = Title
        ChapterLink = TitleLink
        TransChapter = TransTitle
        Title = BookTitle
        TitleLink = nil
        TransTitle = nil
    end
    -- Account for the oddity that is {{cite episode}}, before generation of COinS data.
    if config.CitationClass == "episode" then
        local AirDate = args.airdate
        local SeriesLink = args.serieslink
        local Season = args.season
        local SeriesNumber = args.seriesnumber or args.seriesno
        local Network = args.network
        local Station = args.station
        local s = {}
        if Issue ~= nil then table.insert(s, "episode " .. Issue) Issue = nil end
        if Season ~= nil then table.insert(s, "season " .. Season) end
        if SeriesNumber ~= nil then table.insert(s, "series " .. SeriesNumber) end
        local n = {}
        if Network ~= nil then table.insert(n, Network) end
        if Station ~= nil then table.insert(n, Station) end
        Date = Date or AirDate
        Chapter = Title
        ChapterLink = TitleLink
        TransChapter = TransTitle
        Title = Series
        TitleLink = SeriesLink
        TransTitle = nil
        local Sep = args["series-separator"] or args["separator"] or ". "
        Series = table.concat(s, Sep)
        ID = table.concat(n, Sep)
    end
    
    -- These data form a COinS tag (see <http://ocoins.info/>) which allows automated tools to parse the citation information.
    local OCinSdata = {}
    OCinSdata.ctx_ver = "Z39.88-2004" 
    OCinSdata.rft_val_fmt = "info:ofi/fmt:kev:mtx:"
    OCinSdata.rfr_id = "info:sid/en.wikipedia.org:" .. config.fullpagename    
    if ( nil ~= Periodical ) then
        OCinSdata["rft.genre"] = "article"
        OCinSdata["rft.jtitle"] = Periodical
	    if ( nil ~= Title ) then OCinSdata["rft.atitle"] = Title end
    elseif ( nil ~= Chapter ) then
        OCinSdata["rft.genre"] = "bookitem"
	    OCinSdata["rft.btitle"] = Chapter
	    if ( nil ~= Title ) then OCinSdata["rft.atitle"] = Title end
    else
        OCinSdata["rft.genre"] = "book"
	    if ( nil ~= Title ) then OCinSdata["rft.btitle"] = Title end
    end
    OCinSdata["rft.place"] = PublicationPlace
    OCinSdata["rft.date"] = Date or Year or PublicationDate
    OCinSdata["rft.series"] = Series
    OCinSdata["rft.volume"] = Volume
    OCinSdata["rft.issue"] = Issue
    OCinSdata["rft.pages"] = Page or Pages or At
    OCinSdata["rft.edition"] = Edition
    OCinSdata["rft.pub"] = PublisherName
    OCinSdata["rft.isbn"] = ISBN
    OCinSdata["rft.issn"] = ISSN
    OCinSdata["rft.jfm"] = JFM
    OCinSdata["rft.jstor"] = JSTOR
    OCinSdata["rft.lccn"] = LCCN
    OCinSdata["rft.mr"] = MR
    OCinSdata.rft_id = URL or ChapterURL
    if ( nil ~= a[1] and nil ~= a[1].last) then
    local last = a[1].last
	local first = a[1].first
	OCinSdata["rft.aulast"] = last
        if ( nil ~= first ) then 
	    OCinSdata["rft.aufirst"] = first
	    OCinSdata["rft.au"] = last .. (args.NameSep or ", ") .. first
	else
	    OCinSdata["rft.au"] = last
        end
    end
    local OCinSids = {}
    OCinSids["info:arxiv"] = ARXIV
    OCinSids["info:asin"] = ASIN
    OCinSids["info:bibcode"] = BIBCODE
    OCinSids["info:doi"] = DOI
    OCinSids["info:oclcnum"] = OCLC
    OCinSids["info:olnum"] = OL
    OCinSids["info:osti"] = OSTI
    OCinSids["info:pmc"] = PMC
    OCinSids["info:pmid"] = PMID
    OCinSids["info:rfc"] = RFC
    OCinSids["info:ssrn"] = SSRN
    OCinSids["info:zbl"] = ZBL
    local OCinStitle = ""
    for name,value in pairs(OCinSids) do
        OCinStitle = OCinStitle .. "rft_id=" .. mw.url.encode(name .. "/" .. value) .. "&"
    end
    for name,value in pairs(OCinSdata) do
        OCinStitle = OCinStitle .. mw.url.encode(name .. "=" .. value) .. "&"
    end

    -- Now perform various field substitutions.
    -- We also add leading spaces and surrounding markup and punctuation to the various parts of the citation, but only when they are non-nil.
    if ( Authors == nil ) then 
        local AuthorNameSep = args["author-name-separator"] or args["name-separator"] or "&#44; "
        local AuthorSep = args["author-separator"] or args["separator"] or "&#59; "
        local AuthorFormat = args["author-format"] or args.authorformat
        local AuthorMaximum = tonumber(args["display-authors"] or args.displayauthors) or 8
        local control = { sep = AuthorSep, namesep = AuthorNameSep, format = AuthorFormat, maximum = AuthorMaximum }
        Authors = listpeople(control, a) 
    end
    if ( Editors == nil ) then 
        local EditorNameSep = args["editor-name-separator"] or args["name-separator"] or "&#44; "
        local EditorSep = args["editor-separator"] or args["separator"] or "&#59; "
        local EditorFormat = args["editor-format"] or args.editorformat
        local EditorMaximum = tonumber(args["display-editors"] or args.displayeditors) or 3
        local control = { sep = EdithorSep, namesep = EditorNameSep, format = EditorFormat, maximum = EditorMaximum }
        Editors = listpeople(control, e) 
    end
    if ( Date == nil ) then
--   there's something hinky with how this adds dashes to perfectly-good free-standing years
--[[        Date = Year
        if ( Date ~= nil ) then
            local Month = args.month
            if ( Month == nil ) then 
                local Began = args.began
                local Ended = args.ended
                if Began ~= nil and Ended ~= nil then
                    Month = Began .. "&ndash;" .. Ended
                else
                    Month = "&ndash;"
                end
            end
            Date = Month .. " " .. Date
            local Day = args.day
            if ( Day ~= nil ) then Date = Day .. " " .. Date end
        end
]] -- so let's use the original version for now
        Date = Year
        if ( Date ~= nil ) then
            local Month = args.month
            if ( Month ~= nil ) then 
                Date = Month .. " " .. Date 
                local Day = args.day
                if ( Day ~= nil ) then Date = Day .. " " .. Date end
            end
        end
    end
    if ( PublicationDate == Date or PublicationDate == Year ) then PublicationDate = nil end
    if ( nil ~= ArchiveURL ) then
        local temp = URL
        URL = ArchiveURL
    end
    if ( TransTitle ~= nil ) then TransTitle = " [" .. TransTitle .. "]." else TransTitle = "" end
    if ( TransChapter ~= nil ) then TransChapter = " [" .. TransChapter .. "]." else TransChapter = "" end
    if ( Chapter ~= nil ) then
        if ( ChapterLink ~= nil ) then Chapter = "[[" .. ChapterLink .. "|" .. Chapter .. "]]" end
        if ( Periodical ~= nil ) then
            Chapter = "<i>" .. Chapter .. "</i>"
        else
            Chapter = "\"" .. Chapter .. "\""
        end
        Chapter = Chapter .. TransChapter
        if ( ChapterLink == nil ) then
            if ( ChapterURL ~= nil ) then
                Chapter = "[" .. ChapterURL .. " " .. Chapter .. "]"
            elseif ( URL ~= nil ) then 
                Chapter = "[" .. URL .. " " .. Chapter .. "]"
                URL = nil
            end
        end
        Chapter = " " .. Chapter .. "."
    else 
        Chapter = "" 
    end
    if ( Title ~= nil ) then
        if ( TitleLink ~= nil ) then Title = "[[" .. TitleLink .. "|" .. Title .. "]]" end
        if ( Periodical ~= nil ) then
            Title = "\"" .. Title .. "\""
        elseif ( config.CitationClass == "web"
              or config.CitationClass == "news" ) then
            Title = "\"" .. Title .. "\""
        else
            Title = "<i>" .. Title .. "</i>"
        end
        Title = Title .. TransTitle
        if ( TitleLink == nil and URL ~= nil ) then 
            Title = "[" .. URL .. " " .. Title .. "]"
            URL = nil
        end
        if (Authors ~= nil or Editors ~= nil or "" ~= Chapter)
        then Title = " " .. Title end
    else 
        Title = "" 
    end
    if ( Conference ~= nil ) then
        if ( ConferenceURL ~= nil ) then
            Conference = "[" .. ConferenceURL .. " " .. Conference .. "]"
        end
        Conference = " " .. Conference
    else 
        Conference = "" 
    end
    if ( nil ~= Position or nil ~= Page or nil ~= Pages ) then At = nil end
    if ( nil == Position ) then
        local Minutes = args.minutes
        if ( nil ~= Minutes ) then
            Position = " " .. Minutes .. " minutes in"
        else
            local Time = args.time
            if ( nil ~= Time ) then
                local TimeCaption = args.timecaption or "Event occurs at"
                Position = " " .. TimeCaption .. " " .. Time
            else
                Position = ""
            end
        end
    else
        Position = " " .. Position
    end
    if ( PP ~= nil) then 
        if ( tonumber(PP) ~= nil ) then
          Page = "lone " .. PP
        else Page = "stuff " .. PP
        end
    end
    if ( nil == Page ) then 
        Page = "" 
    elseif ( Periodical ~= nil ) then
        Page = ": " .. Page
    else
        Page = " " .. PPrefix .. Page
    end
    if ( nil == Pages ) then 
        Pages = "" 
    elseif ( Periodical ~= nil ) then
        Pages = ": " .. Pages
    else
        Pages = " " .. PPPrefix .. Pages
    end
    if ( At ~= nil ) then At = " " .. At else At = "" end
    if ( Coauthors ~= nil ) then Coauthors = " " .. Coauthors .. "." else Coauthors = "" end
    if ( Others ~= nil ) then Others = " " .. Others .. "." else Others = "" end
    if ( TitleType ~= nil ) then TitleType = " (" .. TitleType .. ")." else TitleType = "" end
    if ( TitleNote ~= nil ) then TitleNote = " (" .. TitleNote .. ")." else TitleNote = "" end
    if ( PublicationPlace ~= nil ) then PublicationPlace = PublicationPlace .. ": " else PublicationPlace = "" end
    if ( Language ~= nil ) then Language = " (in " .. Language .. ")" else Language = "" end
    if ( Edition ~= nil ) then Edition = " (" .. Edition .. " edition)" else Edition = "" end
    if ( Volume ~= nil ) then Volume = " '''" .. Volume .. "'''" else Volume = "" end
    if ( Issue ~= nil ) then Issue = " (" .. Issue .. ")" else Issue = "" end
    if ( Series ~= nil ) then Series = " " .. Series .. "." else Series = "" end
    if ( Format ~= nil ) then Format = " (" .. Format .. ")" else Format = "" end
    if ( OrigYear ~= nil ) then OrigYear = " " .. OrigYear else OrigYear = "" end
    if ( Date ~= nil ) then Date = Date else Date = "" end
    if ( Via ~= nil ) then Via = " &mdash; via " .. Via else Via = "" end
    if ( AccessDate ~= nil ) then AccessDate = " Retrieved " .. AccessDate .. "." else AccessDate = "" end
    if ( SubscriptionRequired ~= nil ) then
        SubscriptionRequired = " " .. mw.text.tag({name="span", contents="(subscription required)", params={style="font-size:0.95em; font-size: 90%; color: #555"}})
    else
        SubscriptionRequired = ""
    end
    if ( ARXIV ~= nil ) then ARXIV = " " .. externallinkid(frame, {label="arXiv",link="arXiv",prefix="http://arxiv.org/abs/",id=ARXIV,separator=":"}) else ARXIV = "" end
    if ( ASIN ~= nil ) then ASIN = " " .. amazon(frame, ASIN, ASINTLD) else ASIN = "" end
    if ( BIBCODE ~= nil ) then BIBCODE = " " .. externallinkid(frame, {label="Bibcode",link="Bibcode",prefix="http://adsabs.harvard.edu/abs/",id=BIBCODE,separator=":"}) else BIBCODE = "" end
    if ( DOI ~= nil ) then DOI = " " .. doi(frame, DOI, DoiBroken) else DOI = "" end
    if ( ID ~= nil ) then ID = " " .. ID else ID = "" end
    if ( ISBN ~= nil ) then ISBN = " " .. internallinkid(frame, {label="ISBN",link="International Standard Book Number",prefix="Special:BookSources/",id=ISBN}) else ISBN = "" end
    if ( ISSN ~= nil ) then ISSN = " " .. externallinkid(frame, {label="ISSN",link="International Standard Serial Number",prefix="//www.worldcat.org/issn/",id=ISSN}) else ISSN = "" end
    if ( JFM ~= nil ) then JFM = " " .. externallinkid(frame, {label="JFM",link="Jahrbuch über die Fortschritte der Mathematik",prefix="http://www.zentralblatt-math.org/zmath/en/search/?format=complete&q=an:",id=JFM}) else JFM = "" end
    if ( JSTOR ~= nil ) then JSTOR = " " .. externallinkid(frame, {label="JSTOR",link="JSTOR",prefix="http://www.jstor.org/stable/",id=JSTOR}) else JSTOR = "" end
    if ( LCCN ~= nil ) then LCCN = " " .. externallinkid(frame, {label="LCCN",link="Library of Congress Control Number",prefix="http://lccn.loc.gov/",id=LCCN}) else LCCN = "" end
    if ( MR ~= nil ) then MR = " " .. externallinkid(frame, {label="MR",link="Mathematical Reviews",prefix="http://www.ams.org/mathscinet-getitem?mr=",id=MR}) else MR = "" end
    if ( OCLC ~= nil ) then OCLC = " " .. externallinkid(frame, {label="OCLC",link="Online Computer Library Center",prefix="//www.worldcat.org/oclc/",id=OCLC}) else OCLC = "" end
    if ( OL ~= nil ) then OL = " " .. openlibrary(frame, id) else OL = "" end
    if ( OSTI ~= nil ) then OSTI = " " .. externallinkid(frame, {label="OSTI",link="Office of Scientific and Technical Information",prefix="http://www.osti.gov/energycitations/product.biblio.jsp?osti_id=",id=OSTI}) else OSTI = "" end
    if ( PMC ~= nil ) then PMC = " " .. externallinkid(frame, {label="PMC",link="PubMed Central",prefix="//www.ncbi.nlm.nih.gov/pmc/articles/PMC",suffix="/?tool=pmcentrez",id=PMC}) else PMC = "" end
    if ( PMID ~= nil ) then PMID = " " .. externallinkid(frame, {label="PMID",link="PubMed Identifier",prefix="//www.ncbi.nlm.nih.gov/pubmed/",id=PMID}) else PMID = "" end
    if ( RFC ~= nil ) then RFC = " " .. externallinkid(frame, {label="RFC",link="Request for Comments",prefix="//tools.ietf.org/html/rfc",id=RFC}) else RFC = "" end
    if ( SSRN ~= nil ) then SSRN = " " .. externallinkid(frame, {label="SSRN",link="Social Science Research Network",prefix="http://ssrn.com/abstract=",id=SSRN}) else SSRN = "" end
    if ( URL ~= nil ) then URL = " " .. url(frame, URL) else URL = "" end
    if ( ZBL ~= nil ) then ZBL = " " .. externallinkid(frame, {label="ZBL",link="Zentralblatt MATH",prefix="http://www.zentralblatt-math.org/zmath/en/search/?format=complete&q=an:",id=ZBL}) else ZBL = "" end
    if ( Quote ~= nil ) then 
        Quote = " \"" .. Quote .. "\"" 
        PostScript = ""
    else 
        if ( PostScript ~= nil ) then PostScript = " " .. PostScript else PostScript = "" end
        Quote = "" 
    end
    local Archived
    if ( nil ~= ArchiveURL ) then
        if ( ArchiveDate ~= nil ) then ArchiveDate = " " .. ArchiveDate
        else ArchiveDate = "" end
        if ( "no" == DeadURL ) then
            Archived = " [" .. ArchiveURL .. "Archived] from the original on" .. ArchiveDate .. "."
        else
            Archived = " Archived from [" .. args.url .. " the original] on" .. ArchiveDate .. "."
        end
    else
        Archived = ""
    end
    local Lay
    if ( nil ~= LaySummary ) then
        if ( LayDate ~= nil ) then LayDate = " (" .. LayDate .. ")" else LayDate = "" end
        if ( LaySource ~= nil ) then LaySource = " &ndash; ''" .. LaySource .. "''" else LaySource = "" end
        Lay = " [" .. LaySummary .. " lay summary]" .. LaySource .. LayDate
    else
        Lay = ""
    end
    if ( nil ~= Transcript ) then
        if ( TranscriptURL ~= nil ) then Transcript = "[" .. TranscriptURL .. Transcript .. "]" end
    else
        Transcript = ""
    end
    local Publisher
    if ( Periodical ~= nil ) then
        if ( PublicationDate ~= nil ) then PublicationDate = " " .. PublicationDate else PublicationDate = "" end
        if ( PublisherName ~= nil ) then Publisher = " (" .. PublicationPlace .. PublisherName .. PublicationDate .. ")." else Publisher = "" end
        Edition = ""
    else
        if ( PublicationDate ~= nil ) then PublicationDate = " (published " .. PublicationDate .. ")" else PublicationDate = "" end
        if ( PublisherName ~= nil ) then Publisher = " " .. PublicationPlace .. PublisherName .. PublicationDate .. "." else Publisher = "" end
    end
    -- Several of the above rely upon detecting this as nil, so do it last.
    if ( Periodical ~= nil ) then Periodical = " <i>" .. Periodical .. "</i>"
    else Periodical = "" end
    
    -- Piece all bits together at last.  At this point, all should be non-nil.
    -- We build things this way because it is more efficient in LUA not to keep reassigning to the same string variable over and over.
    local idcommon = ARXIV .. ASIN .. BIBCODE .. DOI .. ID .. ISBN .. JFM .. JSTOR .. LCCN .. MR .. OCLC .. OL .. OSTI .. PMC .. PMID .. RFC .. SSRN .. URL .. ZBL .. Archived .. AccessDate .. Via .. SubscriptionRequired .. Lay .. Quote .. PostScript
    local tcommon = Title .. TitleType .. TitleNote .. Format .. Edition .. Language .. Conference .. Periodical .. Series .. Volume .. Issue .. Position .. Page .. Pages .. At .. "."
    Date = Date .. OrigYear
    local text
    if ( "" ~= Authors ) then
        if ( "" ~= Date ) then Date = " ("..Date..")."
        else Authors = Authors .. "." end
        if ( "" ~= Editors ) then Editors = " in " .. Editors .. "." end
        text = Authors .. Coauthors .. " "..Date .. Chapter .. Others .. Editors .. tcommon .. Publisher .. idcommon
    elseif ( "" ~= Editors) then
        Editors = Editors .. " (eds.)"
        if ( "" ~= Date ) then Date = " (" .. Date .. ")."
        else Editors = Editors .. "." end
        text = Editors .. Date .. Chapter .. tcommon .. Publisher .. idcommon
    else
        if ( "" ~= Date ) then Date = " " .. Date .. "." end
        text = Chapter .. tcommon .. Publisher .. Date .. idcommon
    end
    
    -- Now enclose the whole thing in a <span/> element if it is cross-linked from elsewhere.
    if ( Year == nil ) then Year = "" end
    if ( Ref ~= nil ) then 
        local id = Ref
        if ( "harv" == Ref ) then
            local names = {}
            if ( "" ~= Authors ) then
                for i,v in ipairs(a) do names[i] = v.last end
            elseif ( "" ~= Editors ) then
                for i,v in ipairs(e) do names[i] = v.last end
            end
            if ( names[1] == nil ) then 
                names[1] = Year 
            elseif ( names[2] == nil ) then 
                names[2] = Year 
            elseif ( names[3] == nil ) then
                names[3] = Year
            elseif ( names[4] == nil ) then
                names[4] = Year
            else
                names[5] = Year
            end
            id = anchorid(names)
        end
        local args = { class="citation " .. (config.CitationClass or ""), id=id }
        text = mw.text.tag({name="span", contents=text, params=args})
    end
    local OCinS = mw.text.tag({name="span", contents="&nbsp;", params={class="Z3988",title=OCinStitle,style="display: none;"}}) 
        
    return text .. OCinS
end

function r0(frame, name, group, page)
    if ( name == nil ) then return "" end
    if ( group == nil ) then group = "" end
    local p = ""
    if ( page ~= nil ) then 
        local contents = ":" .. page
        p = mw.text.tag({name="sup",contents=contents,params={class="reference",style="white-space:nowrap;"}}) 
    end
    return mw.text.tag({name="ref",contents="",params={name=name,group=group}}, frame) .. p
end

function reflist0(frame, config, args)
    local contents = args.refs or ""
    local liststyle = args.liststyle
    local count = args[1]
    local width = args.colwidth
    local group = args.group or config.default_group
    if ( nil == tonumber(count) and nil == width ) then 
        width = count
        count = nil
    end
    if ( nil == liststyle ) then
        if ( "upper-alpha" == group or "lower-alpha" == group or "upper-roman" == group or "lower-roman" == group or "upper-greek" == group or "lower-greek" == group ) then
            liststyle = group
        else
            liststyle = config.default_liststyle
        end
    end
    local params = {}
    params.class = "reflist"    
    params.style = z.wikitext.liststyle(liststyle)
    if ( nil ~= count ) then        
        params.class = params.class .. " references-column-count references-column-count-" .. count
        params.style = params.style .. " " .. z.wikitext.columncountstyle(count)
    end    
    if ( nil ~= width ) then
        params.class = params.class .. " references-column-width"
        params.style = params.style .. " " .. z.wikitext.columnwidthstyle(width)
    end
    local references = mw.text.tag({name="references",contents=contents,params={group=group}}, frame)
    return mw.text.tag({name="div",contents=references,params=params})
end

function refbegin0(frame, config, args)
    local liststyle = args.liststyle
    local indent = args.indent
    local indentsize = args.indentsize
    local count = args[1]
    local width = args.colwidth
    if ( nil == tonumber(count) and nil == width ) then 
        width = count
        count = nil
    end
    if ( nil == liststyle ) then
        if ( "upper-alpha" == group or "lower-alpha" == group or "upper-roman" == group or "lower-roman" == group or "upper-greek" == group or "lower-greek" == group ) then
            liststyle = group
        else
            liststyle = config.default_liststyle
        end
    end
    local params = {}
    params.class = "refbegin"
    params.style = z.wikitext.liststyle(liststyle)
    if ( nil ~= count ) then        
        params.class = params.class .. " references-column-count references-column-count-" .. count
        params.style = params.style .. " " .. z.wikitext.columncountstyle(count)
    end    
    if ( nil ~= width ) then
        params.class = params.class .. " references-column-width"
        params.style = params.style .. " " .. z.wikitext.columnwidthstyle(width)
    end
    local dlopen
    if ( nil ~= indent ) then
        dlopen = z.wikitext.OpenHTMLTag({name="dl",params={style="text-indent: -" .. (indentsize or "3.2") .. "em;"}})
    else
        dlopen = ""
    end
    return z.wikitext.OpenHTMLTag({name="div",params=params}) .. dlopen
end

function refend0(frame, config, args)
    local indent = args.indent
    local dlclose
    if ( nil ~= indent ) then
        dlclose = "</dl>"
    else
        dlclose = ""
    end
    return dlclose .. "</div>"
end

-- This is used by {{doi}} to create DOI links in the style used in citations.
function z.doi(frame)
    local pframe = frame:getParent()
    local id = pframe.args.id or pframe.args[1] or ""
    return doi(frame, id)
end

-- This is used by {{ISSN}} to create ISSN links in the style used in citations.
function z.ISSN(frame)
    local pframe = frame:getParent()
    local Name = pframe.args[1] or ""
    return hideinprint(frame, "[[International Standard Serial Number|ISSN]]&nbsp;[http://www.worldcat.org/search?fq=x0:jrnl&q=n2:" .. Name .. " " .. Name .. "]")
end

-- This is used by templates such as {{SfnRef}} to create the (encoded) anchor name for a Harvard cross-reference hyperlink.
function z.SFNID(frame)
    local pframe = frame:getParent()
    return anchorid(pframe.args)
end

-- This is used by templates such as {{Harvard citation}} to create the Harvard cross-reference text.
function z.Harvard(frame)
    local pframe = frame:getParent()
    return crossref(frame, pframe.args)
end

-- This is used by templates such as {{cite book}} to create the actual citation text.
function z.citation(frame)
    local pframe = frame:getParent()
    return citation0(frame, pframe.args)
end

-- This is used by templates such as {{sfn}} to create the entire cross-reference.
function z.sfn(frame)
    local pframe = frame:getParent()
    local content = crossref(frame, pframe.args)
    local args = { name = refid(pframe.args) }
    return mw.text.tag({name = "ref", contents = content, params = args}, frame)
end

-- This is used by template {{r}}.
function z.r(frame)
    local pframe = frame:getParent()
    local config = frame.args -- the arguments passed BY the template, in the wikitext of the template itself
    local args = pframe.args -- the arguments passed TO the template, in the wikitext that instantiates the template
    args.page1 = args.page1 or args.page
    local text = ""
    -- This would be shorter using ipairs(), but that doesn't work on an arguments table supplied to a template.
    local index = 1
    while args[index] ~= nil do
        local arg = args[index]
        local t = r0(frame, arg, args.group, args["page" .. index])
        text = text .. t
        index = index + 1
    end
    return text
end

-- This is used by template {{ref label}}.
function z.reflabel(frame)
    local pframe = frame:getParent()
    local config = frame.args -- the arguments passed BY the template, in the wikitext of the template itself
    local args = pframe.args -- the arguments passed TO the template, in the wikitext that instantiates the template
    local P1 = args[1] or ""
    local P2 = args[2] or ""
    local P3 = args[3] or ""
    local id = nil
    local contents = "[[#endnote_" .. P1 .. P3 .. "|&#91;" .. P2 .. "&#93;]]"
    local params = {}
    params.class="reference"
    if ( args.noid == nil or args.noid == "" ) then params.id = "ref_" .. P1 .. P3 end
    return mw.text.tag({name="sup",contents=contents,params=params})
end

-- This is used by template {{note label}}.
function z.notelabel(frame)
    local pframe = frame:getParent()
    local config = frame.args -- the arguments passed BY the template, in the wikitext of the template itself
    local args = pframe.args -- the arguments passed TO the template, in the wikitext that instantiates the template
    local id = args[1] or ""
    local arrow = args[3] or ""
    local postscript = args[4] or ""
    local contents 
    if arrow ~= "" then
        local sup_arrow = mw.text.tag({name="sup",contents=arrow,params={}})
        contents = "[[#ref_" .. id .. arrow .. "|'''" .. sup_arrow .. "''']]" .. postscript
        if "none" == arrow then arrow = "^" end -- Change this AFTER using it in the ID parameter and the contents.
    else
        contents = (args[2] or "") .. postscript
    end
    local params = { class="citation wikicite" }
    if id ~= "" and ( args.noid == nil or args.noid == "" ) then 
        params.id = mw.url.encodeAnchor("endnote_" .. id .. arrow)
    end
    return mw.text.tag({name="span",contents=contents,params=params})
end

-- This is used by templates {{reflist}} and {{notelist}}.
function z.reflist(frame)
    local pframe = frame:getParent()
    local config = frame.args -- the arguments passed BY the template, in the wikitext of the template itself
    local args = pframe.args -- the arguments passed TO the template, in the wikitext that instantiates the template
    return reflist0(frame, config, args)
end

-- This is used by template {{refbegin}}.
function z.refbegin(frame)
    local pframe = frame:getParent()
    local config = frame.args -- the arguments passed BY the template, in the wikitext of the template itself
    local args = pframe.args -- the arguments passed TO the template, in the wikitext that instantiates the template
    return refbegin0(frame, config, args)
end

-- This is used by template {{refend}}.
function z.refend(frame)
    local pframe = frame:getParent()
    local config = frame.args -- the arguments passed BY the template, in the wikitext of the template itself
    local args = pframe.args -- the arguments passed TO the template, in the wikitext that instantiates the template
    return refend0(frame, config, args)
end

-- This is used by template {{efn}}.
function z.efn(frame)
    local pframe = frame:getParent()
    local config = frame.args -- the arguments passed BY the template, in the wikitext of the template itself
    local args = pframe.args -- the arguments passed TO the template, in the wikitext that instantiates the template
    return mw.text.tag({name="ref",contents=(args[1] or ""),params={name=args.name,group=config.default_group}}, frame)
end

return z
Description	What you type	What you get
Italic	''Italic text''	Italic text
Bold	'''Bold text'''	Bold text
Bold & italic	'''''Bold & italic text'''''	*Bold & italic text*