עריכת Module:Citation/CS1

local z = {
    error_categories = {};
}

-- Formats a hidden comment for error trapping not intended to be visible to readers
function hiddencomment( content )
    return '<span style="display: none;" class="citation-comment">' .. content .. '</span>';
end

-- This returns a string with HTML character entities for wikitext markup characters.
function wikiescape(text)
    text = text:gsub( '[&\'%[%]{|}]', {    
            ['&'] = '&#38;',    
            ["'"] = '&#39;',    
            ['['] = '&#91;',    
            [']'] = '&#93;',    
            ['{'] = '&#123;',    
            ['|'] = '&#124;',	
            ['}'] = '&#125;' } );
    return text;
end

-- Create an HTML tag
function createTag(t, frame)
    local name = t.name or "!-- --"
    local content = t.contents or ""
    local attrs = {}
    for n,v in pairs(t.params) do
        if (v) then
            table.insert(attrs, n .. "=\"" .. wikiescape(v) .. "\"")
        else
            table.insert(attrs, n)
        end
    end
    if ("" == content) then
        return "<" .. name .. " " .. table.concat(attrs, " ") .. "/>"
    else
        return "<" .. name .. " " .. table.concat(attrs, " ") .. ">" .. content .. "</" .. name .. ">"
    end
end

--[[
This is a clone of mw.text.nowiki.  When the mw.text library is installed,
this can be replaced by a call to that library. 
]]
function nowiki( s )
    -- string.gsub is safe here, because we're only caring about ASCII chars
    s = string.gsub( s, '["&\'<=>%[%]{|}]', {
        ['"'] = '&#34;',
        ['&'] = '&#38;',
        ["'"] = '&#39;',
        ['<'] = '&#60;',
        ['='] = '&#61;',
        ['>'] = '&#62;',
        ['['] = '&#91;',
        [']'] = '&#93;',
        ['{'] = '&#123;',
        ['|'] = '&#124;',
        ['}'] = '&#125;',
    } )
    s = string.sub( string.gsub( '\n' .. s, '\n[#*:;]', {
        ["\n#"] = "\n&#35;",
        ["\n*"] = "\n&#42;",
        ["\n:"] = "\n&#58;",
        ["\n;"] = "\n&#59;",
    } ), 2 )
    s = string.gsub( s, '://', '&#58;//' )
    s = string.gsub( s, 'ISBN ', 'ISBN&#32;' )
    s = string.gsub( s, 'RFC ', 'RFC&#32;' )

    return s
end

-- Formats a wiki style external link
function externallinkid(args)
    local sep = args.separator or "&nbsp;"
    args.suffix = args.suffix or ""
    local url_string = args.id
    if args.encode == true or args.encode == nil then
        url_string = mw.uri.encode( url_string );
    end
    
    return "[[" .. args.link .. "|" .. args.label .. "]]" .. sep .. "[" .. args.prefix .. url_string .. args.suffix .. " " .. nowiki(args.id) .. "]"
end

-- Formats a wiki style internal link
function internallinkid(args)
    local sep = args.separator or "&nbsp;"
    args.suffix = args.suffix or ""
    return "[[" .. args.link .. "|" .. args.label .. "]]" .. sep .. "[[" .. args.prefix .. args.id .. args.suffix .. "|" .. nowiki(args.id) .. "]]"
end

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

-- Formats a DOI and checks for DOI errors.
function doi(id, inactive)
    local cat = ""
    
    local text;
    if ( inactive ~= nil ) then 
        text = "[[Digital object identifier|doi]]:" .. id;
        table.insert( z.error_categories, "Pages with DOIs inactive since " .. selectyear(inactive) );        
        inactive = " (inactive " .. inactive .. ")" 
    else 
        text = externallinkid({link="Digital object identifier",label="doi",prefix="http://dx.doi.org/",id=id,separator=":"})
        inactive = "" 
    end
    if ( string.sub(id,1,3) ~= "10." ) then
        table.insert( z.error_categories, "Pages with DOI errors" );        
        cat = ' <span class="error">Bad DOI (expected "10." prefix) in code number</span>'
    end
    return text .. inactive .. cat 
 end

-- Escape sequences for content that will be used for URL descriptions
function safeforurl( str )
    return str:gsub( '[%[%]\n]', {    
        ['['] = '&#91;',	
        [']'] = '&#93;',	
        ['\n'] = ' ' } );
end

-- Converts a hyphen to a dash
function hyphentodash( str )
    if str == nil then
        return nil;
    end    
    if str:match( "[%[%]{}<>]" ) ~= nil then 
        return str;
    end    
    return str:gsub( '-', '–' );
end

-- Protects a string that will be wrapped in wiki italic markup '' ... ''
function safeforitalics( str )
    --[[ Note: We can not use <i> for italics, as the expected behavior for
    italics specified by ''...'' in the title is that they will be inverted
    (i.e. unitalicized) in the resulting references.  In addition, <i> and ''
    tend to interact poorly under Mediawiki's HTML tidy. ]]
    
    if str == nil or str == '' then
        return str;
    else
        if str:sub(1,1) == "'" then str = "<span />" .. str; end
        if str:sub(-1,-1) == "'" then str = str .. "<span />"; end
        return str;
    end
end

--[[
Joins a sequence of string together while checking for duplicate separation
characters.
]]
function safejoin( tbl, duplicate_char )
    --[[
    Note: we use string functions here, rather than ustring functions.
    
    This has considerably faster performance and should work correctly as 
    long as the duplicate_char is strict ASCII.  The strings
    in tbl may be ASCII or UTF8.
    ]]
    
    local str = '';
    local comp = '';
    local end_chr = '';
    for _, value in ipairs( tbl ) do
        if value == nil then value = ''; end
        
        if str == '' then
            str = value;
        elseif value ~= '' then
            if value:sub(1,1) == '<' then
                -- Special case of values enclosed in spans and other markup.
                comp = value:gsub( "%b<>", "" );
            else
                comp = value;
            end
            
            if comp:sub(1,1) == duplicate_char then
                end_chr = str:sub(-1,-1);
                if end_chr == duplicate_char then
                    str = str:sub(1,-2) .. value;
                elseif end_chr == "'" then
                    if str:sub(-3,-1) == duplicate_char .. "''" then                  
                        str = str:sub(1, -4) .. "''" .. value;
                    else
                        str = str .. value;
                    end
                elseif end_chr == " " then
                    if str:sub(-2,-1) == duplicate_char .. " " then
                        str = str:sub(1,-3) .. value;
                    else
                        str = str .. value;
                    end
                else
                    str = str .. value;
                end
            else
                str = str .. value;
            end
        end
    end
    return str;
end  

--[[
Return the year portion of a date string, if possible.  
Returns empty string if the argument can not be interpreted
as a year.
]]
function selectyear( str )
    -- Is the input a simple number?
    local num = tonumber( str ); 
    if num ~= nil and num > 0 and num < 2100 and num == math.abs(num) then
        return str;
    else
        -- Use formatDate to interpret more complicated formats
        local lang = mw.getContentLanguage();
        local good, result;
        good, result = pcall( lang.formatDate, lang, 'Y', str )
        if good then 
            return result;
        else
            -- Can't make sense of this input, return blank.
            return "";
        end
    end
end

-- Formats an OpenLibrary link, and checks for associated errors.
function openlibrary(id)
    local code = id:sub(-1,-1)
    if ( code == "A" ) then
        return externallinkid({link="Open Library",label="OL",prefix="http://openlibrary.org/authors/OL",id=id})
    elseif ( code == "M" ) then
        return externallinkid({link="Open Library",label="OL",prefix="http://openlibrary.org/books/OL",id=id})
    elseif ( code == "W" ) then
        return externallinkid({link="Open Library",label="OL",prefix= "http://openlibrary.org/works/OL",id=id})
    else
        table.insert( z.error_categories, "Pages with OL errors" );
        return externallinkid({link="Open Library",label="OL",prefix= "http://openlibrary.org/OL",id=id}) .. 
            ' <span class="error">Bad OL specified</span>';
    end
end

-- Attempts to convert names to initials.
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

-- Formats a list of people (e.g. authors / editors) 
function listpeople(control, people)
    local sep = control.sep;
    if sep:sub(-1,-1) ~= " " then sep = sep .. " " end
    local namesep = control.namesep
    local format = control.format
    local maximum = control.maximum
    local lastauthoramp = control.lastauthoramp;
    local text = {}
    local etal = false;
    for i,person in ipairs(people) do
        if (person.last ~= nil or person.last ~= "") then
            local mask = person.mask
            local one
            if ( maximum ~= nil and i == maximum + 1 ) then
                etal = true;
                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 and first ~= '') then 
                    if ( "vanc" == format ) then first = reducetoinitials(first) end
                    one = one .. namesep .. first 
                end
                if (person.link ~= nil and person.link ~= "") then one = "[[" .. person.link .. "|" .. one .. "]]" end
            end
            table.insert(text, one)
        end
    end
    local count = #text;
    if count > 1 and lastauthoramp ~= nil and lastauthoramp ~= "" and not etal then
        text[count-1] = text[count-1] .. " & " .. text[count];
        text[count] = nil;
    end    
    local result = table.concat(text, sep) -- construct list
    if etal then 
        local etal_text = "et al."
        if (sepc == ".") then etal_text = "et al" end
        result = result .. " " .. etal_text;
    end
    
    if ( "scap" == format ) then result= createTag({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, count
end

-- Generates a CITEREF anchor ID.
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 ""
    
    -- Bugzilla 46608
    local encoded = mw.uri.anchorEncode( P1 .. P2 .. P3 .. P4 .. P5 );
    if encoded == false then
        encoded = "";
    end
    
    return "CITEREF" .. encoded;
end

-- Gets author list from the input arguments
function extractauthors(args)
    local authors = {};
    local i = 1;
    local last;
    
    while true do
        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 ( last and "" < last ) then -- just in case someone passed in an empty parameter
            authors[i] = {
                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]
            }
        else
            break;
        end
        i = i + 1;
    end
    return authors;
end

-- Gets editor list from the input arguments
function extracteditors(args)
    local editors = {};
    local i = 1;
    local last;
    
    while true do
        last = args["editor" .. i .. "-last"] or args["editor-last" .. i] or args["EditorSurname" .. i] or args["Editor" .. i] or args["editor" .. i]
        if ( last and "" < last ) then -- just in case someone passed in an empty parameter
            editors[i] = {
                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]
            }
        else
            break;
        end
        i = i + 1;
    end
    return editors;
end

--[[
This is the main function foing the majority of the citation
formatting.
]]
function citation0( config, args)
    -- Load Input Parameters

    local PPrefix = config.PPrefix or "p.&nbsp;"
    local PPPrefix = config.PPPrefix or "pp.&nbsp;"
    if ( nil ~= args.nopp ) then PPPrefix = "" PPrefix = "" end
    
    -- Transfer unnumbered arguments to numbered arguments if necessary.
    args["author1"] = args.author1 or args.author or args.authors
    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 or args.first1 or args.given or args.given1
    args["author1-link"] = args["author1-link"] or args["author-link"]
    args["author1-mask"] = args["author1-mask"] or args["author-mask"] or args["authormask"]
    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"] or args["editormask"]
    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 = extractauthors( args );

    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 = extracteditors( args );

    local Year = args.year 
    local PublicationDate = args.publicationdate or args["publication-date"]
    local OrigYear = args.origyear
    local Date = args.date
    local LayDate = args.laydate
    ------------------------------------------------- Get title data
    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.contribution 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 or 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
    if ( config.CitationClass == "encyclopaedia" ) then
        if ( args.article and args.article ~= "") then
            if ( Title and Title ~= "") then Periodical = Title end
            Chapter = args.article
            TransChapter = TransTitle
            Title = nil          
            TransTitle = nil
        elseif ( Chapter == nil or Chapter == '' ) then
            if Title ~= args.encyclopedia then 
                Chapter = Title
                TransChapter = TransTitle
                Title = nil 
                TransTitle = nil
            end
        end
        if ( Periodical and Periodical ~= "") then
            if Periodical == Title or Periodical == Chapter then Periodical = nil end
        end
    end
    local Series = args.series or args.version
    local Volume = args.volume
    local Issue = args.issue or args.number
    local Position = nil
    local Page = args.p or args.page
    local Pages = hyphentodash( args.pp or args.pages )
    local At = args.at
    local page_error = false;
    
    if Page ~= nil and Page ~= '' then
        if (Pages ~= nil and Pages ~= '') or (At ~= nil and At ~= '') then
            Pages = nil;
            At = nil;
            page_error = true;
        end
    elseif Pages ~= nil and Pages ~= '' then
        if At ~= nil and At ~= '' then
            At = nil;
            page_error = true;
        end
    end
    
    local Edition = args.edition
    local PublicationPlace = args["publication-place"] or args.publicationplace or args.place or args.location
    local Location = PublicationPlace
    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 Agency = args.agency
    local DeadURL = args.deadurl or "yes"           -- Only used is ArchiveURL is present.
    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"] or 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 or "."
    local LaySummary = args.laysummary
    local LaySource = args.laysource
    local Transcript = args.transcript
    local TranscriptURL = args["transcript-url"] or args.transcripturl
    local sepc = args.separator or "."
    local LastAuthorAmp = args.lastauthoramp
    local no_tracking_cats = args["template doc demo"] or args.nocat or args.notracking or args["no-tracking"] or "";
    local MessageTail = {};

    if ( config.CitationClass == "journal" ) then
        if (URL == nil or URL == "") then
          if (PMC ~= nil and PMC ~="")
            then URL="http://www.ncbi.nlm.nih.gov/pmc/articles/PMC" .. PMC
            else URL=nil
          end
        end
    elseif ( config.CitationClass == "citation" ) then
        sepc = ","
        if ( Ref == nil ) then Ref = "harv" end
    end

    -- 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 = {} -- COinS metadata excluding id, bibcode, doi, etc.
    local ctx_ver = "Z39.88-2004" 
    OCinSdata.rft_val_fmt = "info:ofi/fmt:kev:mtx:book"
    if ( nil ~= Periodical ) then
        OCinSdata.rft_val_fmt = "info:ofi/fmt:kev:mtx:journal"
        OCinSdata["rft.genre"] = "article"
        OCinSdata["rft.jtitle"] = Periodical
        if ( nil ~= Title ) then OCinSdata["rft.atitle"] = Title end
    end
    if ( nil ~= Chapter and "" ~= Chapter) then
        OCinSdata.rft_val_fmt = "info:ofi/fmt:kev:mtx:book"
        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 = {} -- COinS data only for id, bibcode, doi, pmid, etc.
    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 = "ctx_ver=" .. ctx_ver  -- such as "Z39.88-2004"
    for name,value in pairs(OCinSids) do
        OCinStitle = OCinStitle .. "&rft_id=" .. mw.uri.encode(name .. "/" .. value)
    end
    for name,value in pairs(OCinSdata) do
        OCinStitle = OCinStitle .. "&" .. name .. "=" .. mw.uri.encode(value)
    end
    
    local this_page = mw.title.getCurrentTitle();
    OCinStitle = OCinStitle .. "&rfr_id=info:sid/en.wikipedia.org:"
       .. this_page.prefixedText  -- end COinS data by page's non-encoded pagename

    if (Periodical ~= nil and Periodical ~= "") and
        (Chapter == nil or Chapter == '') and
        (Title ~= nil and Title ~= "") then
            Chapter = Title
            ChapterLink = TitleLink
            TransChapter = TransTitle
            Title = nil
            TitleLink = nil
            TransTitle = nil            
    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 Maximum = tonumber(args["display-authors"] or args.displayauthors);
        
        -- Preserve old-style implicit et al.
        if Maximum == nil and #a == 9 then 
            Maximum = 8;
            table.insert( z.error_categories, 'Pages using citations with old-style implicit et al.' );
            table.insert( MessageTail, 'Citation uses old-style implicit et al. for authors' );
        elseif Maximum == nil then
            Maximum = #a + 1;
        end
            
        local control = { 
            sep = (args["author-separator"] or ";") .. " ",
            namesep = (args["author-name-separator"] or args["name-separator"] or ",") .. " ",
            format = args["author-format"] or args.authorformat,
            maximum = Maximum,
            lastauthoramp = LastAuthorAmp
        }
        
        -- If the coauthor field is also used, prevent ampersand and et al. formatting.
        if Coauthors ~= nil and Coauthors ~= "" then
            control.lastauthoramp = nil;
            control.maximum = #a + 1;
        end
                
        Authors = listpeople(control, a) 
    end
    local EditorCount
    if ( Editors == nil ) then 
        local Maximum = tonumber(args["display-editors"] or args.displayeditors);

        -- Preserve old-style implicit et al.
        if Maximum == nil and #e == 4 then 
            Maximum = 3;
            table.insert( z.error_categories, 'Pages using citations with old-style implicit et al.' );
            table.insert( MessageTail, 'Citation uses old-style implicit et al. for editors' );
        elseif Maximum == nil then
            Maximum = #e + 1;
        end

        local control = { 
            sep = (args["editor-separator"] or ";") .. " ",
            namesep = (args["editor-name-separator"] or args["name-separator"] or ",") .. " ",
            format = args["editor-format"] or args.editorformat,
            maximum = Maximum,
            lastauthoramp = LastAuthorAmp
            }

        Editors, EditorCount = listpeople(control, e) 
    else
        EditorCount = 1;
    end
    if ( Date == nil or Date == "") 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 and Date ~="") then
            local Month = args.month
            if ( Month ~= nil and Month ~= "") then 
                Date = Month .. " " .. Date 
                local Day = args.day
                if ( Day ~= nil ) then Date = Day .. " " .. Date end
                else Month = ""
            end
            else Date = ""
        end
    end
    if ( PublicationDate == Date or PublicationDate == Year ) then PublicationDate = nil end
    if( (Date == nil or Date == "") and PublicationDate ~= nil ) then 
        Date = PublicationDate;
        PublicationDate = nil;
    end    

    -- Captures the value for Date prior to adding parens or other textual transformations
    local DateIn = Date
    
    if ( URL == nil or URL == '' ) and
            ( ChapterURL == nil or ChapterURL == '' ) and
            ( ArchiveURL == nil or ArchiveURL == '' ) and                
            ( ConferenceURL == nil or ConferenceURL == '' ) and                
            ( TranscriptURL == nil or TranscriptURL == '' ) then

        -- Test if cite web is called without giving a URL
        if ( config.CitationClass == "web" ) then
            table.insert( z.error_categories, 'Pages using web citations with no URL' );
            table.insert( MessageTail, 'No URL on cite web' );
        end

        -- Test if accessdate is given without giving a URL
        if ( AccessDate ~= nil and AccessDate ~= '' ) then
            table.insert( z.error_categories, 'Pages using citations with accessdate and no URL' );
            table.insert( MessageTail, 'Accessdate used without URL' );
            AccessDate = nil;
        end      
    
        -- Test if format is given without giving a URL
        if ( Format ~= nil and Format ~= '' ) then
            table.insert( z.error_categories, 'Pages using citations with format and no URL' );
            Format = Format .. hiddencomment( "File format specified without giving a URL" );
        end        
    end    

    -- Test if citation has no title
    if ( Chapter == nil or Chapter == "" ) and 
            ( Title == nil or Title == "" ) and
            ( Periodical == nil or Periodical == "" ) and
            ( Conference == nil or Conference == "" ) and 
            ( TransTitle == nil or TransTitle == "" ) and
            ( TransChapter == nil or TransChapter == "" ) then
        table.insert( z.error_categories, 'Pages with citations lacking titles' );
        table.insert( MessageTail, 'Citation has no title' );
    end

    if ( Format ~= nil and Format ~="" ) then
        Format = " (" .. Format .. ")" else Format = "" end
    
    local OriginalURL = URL
    DeadURL = DeadURL:lower();
    if ( ArchiveURL and "" < ArchiveURL ) then
        if ( DeadURL ~= "no" ) then
            URL = ArchiveURL
        end
    end

    if ( TransTitle and "" < TransTitle ) then TransTitle = " [" .. TransTitle .. "&#93;" else TransTitle = "" end
    if ( TransChapter and "" < TransChapter ) then TransChapter = " [" .. TransChapter .. "&#93;" else TransChapter = "" end
        
    -- Format chapter / article title
    if ( Chapter ~= nil and Chapter ~= "" ) then
        if ( ChapterLink and "" < ChapterLink ) then Chapter = "[[" .. ChapterLink .. "|" .. Chapter .. "]]" end
        if ( Periodical and "" < Periodical ) and (Title ~= nil and Title ~= "" )
        then
            Chapter = "''" .. safeforitalics(Chapter) .. "''"
        else
            Chapter = "\"" .. Chapter .. "\""
        end
    else
        Chapter = "";
    end
    if TransChapter ~= "" and Chapter == "" then
        table.insert( z.error_categories, 'Pages with citations using translated terms without the original' );
        TransChapter = TransChapter .. hiddencomment( "Translated title included without the original" );
    end
    Chapter = Chapter .. TransChapter
    if Chapter ~= "" then
        if ( ChapterLink == nil ) then
            if ( ChapterURL and "" < ChapterURL ) then
                Chapter = "[" .. ChapterURL .. " " .. safeforurl( Chapter )  .. "]"
            elseif ( URL and "" < URL ) then 
                Chapter = "[" .. URL .. " " .. safeforurl( Chapter ) .. "]" .. Format
                URL = nil
                Format = ""
            end
        end
        Chapter = Chapter .. sepc .. " " -- with end-space
    end
    
    -- Format main title.
    if ( Title and "" < Title ) then
        if ( TitleLink and "" < TitleLink ) then
            Title = "[[" .. TitleLink .. "|" .. Title .. "]]" end
        if ( Periodical and "" < Periodical ) then
            Title = "\"" .. Title .. "\""
        elseif ( config.CitationClass == "web"
                or config.CitationClass == "news" ) and 
                Chapter == "" then
            Title = "\"" .. Title .. "\""
        else
            Title = "''" .. safeforitalics(Title) .. "''"
        end
    else
        Title = "";
    end    
    if TransTitle ~= "" and Title == "" then
        table.insert( z.error_categories, 'Pages with citations using translated terms without the original' );
        TransTitle = TransTitle .. hiddencomment( "Translated title included without the original" );
    end
    Title = Title .. TransTitle
    if Title ~= "" then
        if ( TitleLink == nil and URL and "" < URL ) then 
            Title = "[" .. URL .. " " .. safeforurl( Title ) .. "]" .. Format
            URL = nil
            Format = ''
        end
    end


    if ( Conference ~= nil and Conference ~="" ) then
        if ( ConferenceURL ~= nil ) then
            Conference = "[" .. ConferenceURL .. " " .. safeforurl( Conference ) .. "]"
        end
        Conference = " " .. Conference
    else 
        Conference = "" 
    end
    if ( nil ~= Position or nil ~= Page or nil ~= Pages ) then At = nil end
    if ( nil == Position and "" ~= 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 ( nil == Page or "" == Page ) then 
        Page = "" 
        if ( nil == Pages or "" == Pages) then 
            Pages = ""
        elseif ( Periodical ~= nil and Periodical ~= "" and
                 config.CitationClass ~= "encyclopaedia" and
                 config.CitationClass ~= "web" and
                 config.CitationClass ~= "book" and
                 config.CitationClass ~= "news") then
            Pages = ": " .. Pages
        else
            if ( tonumber(Pages) ~= nil ) then
              Pages = sepc .." " .. PPrefix .. Pages
            else Pages = sepc .." " .. PPPrefix .. Pages
            end
        end
    else
        Pages = ""
        if ( Periodical ~= nil and Periodical ~= "" and
             config.CitationClass ~= "encyclopaedia" and
             config.CitationClass ~= "web" and
             config.CitationClass ~= "book" and
             config.CitationClass ~= "news") then
            Page = ": " .. Page
        else
            Page = sepc .." " .. PPrefix .. Page
        end
    end
    if ( At ~= nil and At ~="") then At = sepc .. " " .. At
    else At = "" end
    if ( Coauthors == nil ) then Coauthors = "" end
    if ( Others ~= nil and Others ~="" ) then
        Others = sepc .. " " .. Others else Others = "" end
    if ( TitleType ~= nil and TitleType ~="" ) then
        TitleType = " (" .. TitleType .. ")" else TitleType = "" end
    if ( TitleNote ~= nil and TitleNote ~="" ) then
        TitleNote = sepc .. " " .. TitleNote else TitleNote = "" end
    if ( PublicationPlace ~= nil and PublicationPlace ~="" ) then
        PublicationPlace = PublicationPlace .. ": "
        else PublicationPlace = "" end
    if ( Language ~= nil and Language ~="" ) then
        Language = " (in " .. Language .. ")" else Language = "" end
    if ( Edition ~= nil and Edition ~="" ) then
        Edition = " (" .. Edition .. " ed.)" else Edition = "" end
    if ( Volume ~= nil and Volume ~="" )
    then
        if ( mw.ustring.len(Volume) > 4 )
          then Volume = sepc .." " .. Volume
          else Volume = " <b>" .. hyphentodash(Volume) .. "</b>"
        end
    else Volume = "" end
    if ( Issue ~= nil and Issue ~="" ) then
        Issue = " (" .. Issue .. ")" else Issue = "" end
    if ( Series ~= nil and Series ~="" ) then
        Series = sepc .. " " .. Series else Series = "" end
    if ( OrigYear ~= nil and OrigYear ~="" ) then
        OrigYear = " [" .. OrigYear .. "]" else OrigYear = "" end
    if ( Agency ~= nil and Agency ~="" ) then
        Agency = sepc .. " " .. Agency else Agency = "" end
    ------------------------------------ totally unrelated data
    if ( Date ~= nil ) then Date = Date else Date = "" end
    if ( Via ~= nil and Via ~="" ) then
        Via = " &mdash; via " .. Via else Via = "" end
    if ( AccessDate ~= nil and AccessDate ~="" )
    then local retrv_text = " retrieved "
         if (sepc == ".") then retrv_text = " Retrieved " end
         AccessDate = '<span class="reference-accessdate">'
         .. sepc .. retrv_text .. AccessDate .. '</span>'
    else AccessDate = "" end
    if ( SubscriptionRequired ~= nil and
         SubscriptionRequired ~= "" ) then
        SubscriptionRequired = sepc .. " " .. createTag({name="span", contents="(subscription required)", params={style="font-size:0.95em; font-size: 90%; color: #555"}})
    else
        SubscriptionRequired = ""
    end
    if ( ARXIV ~= nil and ARXIV ~= "" ) then
        ARXIV = sepc .. " " .. externallinkid({label="arXiv",link="arXiv",prefix="http://arxiv.org/abs/",id=ARXIV,separator=":",encode=false}) else ARXIV = "" end
    if ( ASIN ~= nil and ASIN ~= "" ) then 
        ASIN = sepc .. " " .. amazon(ASIN, ASINTLD) else ASIN = "" end
    if ( BIBCODE ~= nil and BIBCODE ~= "" ) then
        BIBCODE = sepc .. " " .. externallinkid({label="Bibcode",link="Bibcode",prefix="http://adsabs.harvard.edu/abs/",id=BIBCODE,separator=":"}) else BIBCODE = "" end
    if ( DOI ~= nil and DOI ~= "" ) then
        DOI = sepc .. " " .. doi(DOI, DoiBroken) else DOI = "" end
    if ( ID ~= nil and ID ~="") then ID = sepc .." ".. ID else ID="" end
    if ( ISBN ~= nil and ISBN ~= "") then
        ISBN = sepc .. " " .. internallinkid({label="ISBN",link="International Standard Book Number",prefix="Special:BookSources/",id=ISBN}) else ISBN = "" end
    if ( ISSN ~= nil and ISSN ~="" ) then
        ISSN = sepc .. " " .. externallinkid({label="ISSN",link="International Standard Serial Number",prefix="//www.worldcat.org/issn/",id=ISSN,encode=false}) else ISSN = "" end
    if ( JFM ~= nil and JFM ~="" ) then
        JFM = sepc .." " .. externallinkid({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 and JSTOR ~="") then
        JSTOR = sepc .." " .. externallinkid({label="JSTOR",link="JSTOR",prefix="http://www.jstor.org/stable/",id=JSTOR}) else JSTOR = "" end
    if ( LCCN ~= nil and LCCN ~="" ) then
        LCCN = sepc .." " .. externallinkid({label="LCCN",link="Library of Congress Control Number",prefix="http://lccn.loc.gov/",id=LCCN,encode=false}) else LCCN = "" end
    if ( MR ~= nil and MR ~="" ) then
        MR = sepc .." " .. externallinkid({label="MR",link="Mathematical Reviews",prefix="http://www.ams.org/mathscinet-getitem?mr=",id=MR}) else MR = "" end
    if ( OCLC ~= nil and OCLC ~="") then 
        OCLC = sepc .." " .. externallinkid({label="OCLC",link="OCLC",prefix="//www.worldcat.org/oclc/",id=OCLC}) else OCLC = "" end
    if ( OL ~= nil and OL ~="") then
        OL = sepc .. " " .. openlibrary(OL) else OL = "" end    
    if ( OSTI ~= nil and OSTI ~="") then
        OSTI = sepc .." " .. externallinkid({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 and PMC ~="") then
        PMC = sepc .." " .. externallinkid({label="PMC",link="PubMed Central",prefix="//www.ncbi.nlm.nih.gov/pmc/articles/PMC",suffix=" ",id=PMC}) else PMC = "" end
    if ( PMID ~= nil and PMID ~="") then
        PMID = sepc .." " .. externallinkid({label="PMID",link="PubMed Identifier",prefix="//www.ncbi.nlm.nih.gov/pubmed/",id=PMID,encode=false}) else PMID = "" end
    if ( RFC ~= nil and RFC ~="") then
        RFC = sepc .." " .. externallinkid({label="RFC",link="Request for Comments",prefix="//tools.ietf.org/html/rfc",id=RFC,encode=false}) else RFC = "" end
    if ( SSRN ~= nil and SSRN ~="") then
        SSRN = sepc .." " .. externallinkid({label="SSRN",link="Social Science Research Network",prefix="http://ssrn.com/abstract=",id=SSRN}) else SSRN = "" end
    if ( ZBL ~= nil and ZBL ~="") then
        ZBL = sepc .." " .. externallinkid({label="Zbl",link="Zentralblatt MATH",prefix="http://www.zentralblatt-math.org/zmath/en/search/?format=complete&q=an:",id=ZBL}) else ZBL = "" end

    if ( URL ~= nil and URL ~="") then
        URL = " " .. "[" .. URL .. " " .. nowiki(URL) .. "]";
        table.insert( z.error_categories, "Pages with citations having bare URLs" );
        if config.CitationClass == "web" then
            table.insert( z.error_categories, "Pages using web citations with no title" );
            URL = URL .. " <span class='error'>No <code>title=</code> specified</span>"
        else
            URL = URL .. hiddencomment("Bare URL needs a title");
        end       
    else
        URL = ""
    end

    if ( Quote and Quote ~="" ) then 
        if Quote:sub(1,1) == '"' and Quote:sub(-1,-1) == '"' then
            Quote = Quote:sub(2,-2);
        end
        
        Quote = sepc .." \"" .. Quote .. "\"" 
        PostScript = ""
    else 
        if ( PostScript == nil) then PostScript = "" end
        Quote = "" 
    end
    
    local Archived
    if ( nil ~= ArchiveURL and "" ~= ArchiveURL ) then
        if ( ArchiveDate ~= nil and ArchiveDate ~="" ) then
            ArchiveDate = " " .. ArchiveDate
        else 
            ArchiveDate = " <span class='error'>If you specify <code>archiveurl=</code>, you must also specify <code>archivedate=</code></span> "
            table.insert( z.error_categories, 'Pages with archiveurl citation errors' );
        end
        local arch_text = " archived"
        if (sepc == ".") then arch_text = " Archived" end
        if ( "no" == DeadURL ) then
            Archived = sepc .. " [" .. ArchiveURL .. arch_text .. "] from the original on" .. ArchiveDate
            if OriginalURL == nil or OriginalUrl == '' then
                table.insert( z.error_categories, 'Pages with archiveurl citation errors' );
                Archived = Archived .. " <span class='error'>If you specify <code>archiveurl=</code>" ..
                    " and <code>deadurl=no</code>, then you must also specify <code>url=</code></span>";                               
            end
        else
            if OriginalURL ~= nil and OriginalURL ~= '' then
                Archived = sepc .. arch_text .. " from [" .. OriginalURL .. " the original] on" .. ArchiveDate
            else
                if config.CitationClass ~= 'web' then 
                    Archived = sepc .. arch_text .. " from <span class='error'>If you specify <code>archiveurl=</code>" ..
                        ", you must also specify <code>url=</code></span> on" .. ArchiveDate
                    table.insert( z.error_categories, 'Pages with archiveurl citation errors' );
                else
                    Archived = sepc .. arch_text .. " from the original on" .. ArchiveDate
                end
            end                
        end
    else
        Archived = ""
    end
    local Lay
    if ( nil ~= LaySummary and "" ~= LaySummary ) then
        if ( LayDate ~= nil ) then LayDate = " (" .. LayDate .. ")" else LayDate = "" end
        if ( LaySource ~= nil ) then 
            LaySource = " &ndash; ''" .. safeforitalics(LaySource) .. "''" 
        else 
            LaySource = "" 
        end
        Lay = sepc .. " [" .. LaySummary .. " Lay summary]" .. LaySource .. LayDate
    else
        Lay = ""
    end
    if ( nil ~= Transcript and "" ~= Transcript ) then
        if ( TranscriptURL ~= nil ) then Transcript = "[" .. TranscriptURL .. Transcript .. "]" end
    else
        Transcript = ""
    end
    local Publisher = ""
    if ( Periodical and Periodical ~= "" and
         config.CitationClass ~= "encyclopaedia" and
         config.CitationClass ~= "web" ) then
        if ( PublicationDate and PublicationDate ~="" )
            then PublicationDate = " " .. PublicationDate
            else PublicationDate = "" end
        if ( PublisherName and PublisherName ~="" ) then
            Publisher = " (" .. PublicationPlace .. PublisherName .. PublicationDate .. ")"
        else
            if (Location ~= nil and Location ~= '') then Publisher= " (" .. Location .. ")"
            else Publisher = "" end
        end
    else
        if ( PublicationDate and PublicationDate ~="" ) then
            PublicationDate = " (published " .. PublicationDate .. ")"
            else PublicationDate = "" end
        if ( PublisherName and PublisherName ~="" ) then
            Publisher = sepc .. " " .. PublicationPlace .. PublisherName .. PublicationDate
        else
            if (Location ~= nil and Location ~= '') then Publisher= sepc .. " " .. Location
            else Publisher = "" end
        end
    end
    -- Several of the above rely upon detecting this as nil, so do it last.
    if ( Periodical ~= nil and Periodical ~="" ) then 
        if ( Title and Title ~= "" ) or ( TitleNote and TitleNote ~= "" ) then 
            Periodical = sepc .. " ''" .. safeforitalics(Periodical) .. "''"
        else 
            Periodical = "''" .. safeforitalics(Periodical) .. "''"
        end
    else Periodical = "" end

    -- Piece all bits together at last.  Here, 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 tcommon
    if ( config.CitationClass == "journal" and
         Periodical ~= "" ) then
        if (Others ~= "") then Others = Others .. sepc .. " " end
        tcommon = safejoin( {Others, Title, TitleNote, Conference, Periodical, Format, TitleType, Series, Language, Edition, Publisher, Agency, Volume, Issue, Position}, sepc );
    elseif ( config.CitationClass == "citation" ) or (config.CitationClass == "encyclopaedia" ) then
        tcommon = safejoin( {Title, TitleNote, Conference, Periodical, Format, TitleType, Series, Language, Volume, Issue, Edition, Publisher, Agency, Others, Position}, sepc );
    else 
        tcommon = safejoin( {Title, TitleNote, Conference, Periodical, Format, TitleType, Series, Language, Volume, Issue, Others, Edition, Publisher, Agency, Position}, sepc );
    end
    
    local idcommon = safejoin( { ARXIV, ASIN, BIBCODE, DOI, ISBN, ISSN, JFM, JSTOR, LCCN, MR, OCLC, OL, OSTI, PMC, PMID, RFC, SSRN, URL, ZBL, ID, Archived, AccessDate, Via, SubscriptionRequired, Lay, Quote }, sepc );

    local text
    local pgtext = Page .. Pages .. At
    if page_error then
        table.insert( z.error_categories, 'Pages with citations using conflicting page specifications' );
        pgtext = pgtext .. hiddencomment('Bad page specification here');
    end
    
    if ( "" ~= Authors ) then
        if (Coauthors ~= "") 
          then Authors = Authors .. "; " .. Coauthors
        end
        if ( "" ~= Date )
          then Date = " ("..Date..")" .. OrigYear .. sepc .. " "
          else
            if ( string.sub(Authors,-1,-1) == sepc) --check end character
              then Authors = Authors .. " "
              else Authors = Authors .. sepc .. " "
            end
        end
        if ( "" ~= Editors) then
            local in_text = " in "
            if (sepc == '.') then in_text = " In " end
            if (string.sub(Editors,-1,-1) == sepc)
                then Editors = in_text .. Editors .. " "
                else Editors = in_text .. Editors .. sepc .. " "
            end
        end
        text = safejoin( {Authors, Date, Chapter, Editors, tcommon }, sepc );
        text = safejoin( {text, pgtext, idcommon}, sepc );
    elseif ( "" ~= Editors) then
        if ( "" ~= Date ) then
            if EditorCount <= 1 then
                Editors = Editors .. ", ed."
            else
                Editors = Editors .. ", eds."
            end
            Date = " (" .. Date ..")" .. OrigYear .. sepc .. " "
        else
            if EditorCount <= 1 then
                Editors = Editors .. " (ed.)" .. sepc .. " "
            else
                Editors = Editors .. " (eds.)" .. sepc .. " "
            end
        end
        text = safejoin( {Editors, Date, Chapter, tcommon}, sepc );
        text = safejoin( {text, pgtext, idcommon}, sepc );
    else
        if ( "" ~= Date ) then
            if ( string.sub(tcommon,-1,-1) ~= sepc )
              then Date = sepc .." " .. Date .. OrigYear
              else Date = " " .. Date .. OrigYear
            end
        end -- endif ""~=Date
        if ( config.CitationClass=="journal" and Periodical ) then
          text = safejoin( {Chapter, tcommon}, sepc );
          text = safejoin( {text, pgtext, Date, idcommon}, sepc );
        else
          text = safejoin( {Chapter, tcommon, Date}, sepc );
          text = safejoin( {text, pgtext, idcommon}, sepc );
        end
    end
    
    if ( config.CitationClass == "citation") then PostScript = "" end
    if PostScript ~= '' and PostScript ~= nil and PostScript ~= sepc then
        text = safejoin( {text, sepc}, sepc );  --Deals with italics, spaces, etc.
        text = text:sub(1,-2); --Remove final seperator    
    end    
    
    text = safejoin( {text, PostScript}, sepc );

    -- Now enclose the whole thing in a <span/> element
    if ( Year == nil ) then
        if ( DateIn ~= nil and DateIn ~= "" ) then 
            Year = selectyear( DateIn )
        elseif( PublicationDate ~= nil and PublicationDate ~= "" ) then
            Year = selectyear( PublicationDate )
        else
            Year = ""
        end
    end
    local classname = "citation"
    if ( config.CitationClass ~= "citation" )
       then classname = "citation " .. (config.CitationClass or "") end
    local args = { class=classname }
    if ( Ref ~= nil ) then 
        local id = Ref
        if ( "harv" == Ref ) then
            local names = {} --table of last names & year
            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
        args.id = id;
    end
    
    if string.len(text:gsub("<span[^>/]*>.-</span>", ""):gsub("%b<>","")) <= 2 then
        z.error_categories = { 'Pages with empty citations' };
        text = '<span class="error">Citation is empty</span>';
        MessageTail = {};
    end
    
    text = createTag({name="span", contents=text, params=args})

    local empty_span = createTag( {name="span", contents="&nbsp;", params={style="display: none;"}} );
    
    -- Note: Using display: none on then COinS span breaks some clients.
    local OCinS = createTag({name="span", contents=empty_span, params={class="Z3988",title=OCinStitle }}) 
    text = text .. OCinS;
    
    if #MessageTail ~= 0 then
        text = text .. hiddencomment( table.concat( MessageTail, "; " ) );
    end
    
    if no_tracking_cats == '' then
        for _, v in ipairs( z.error_categories ) do
            text = text .. '[[Category:' .. v ..']]';
        end
    end
    
    return text
end

-- This is used by templates such as {{cite book}} to create the actual citation text.
function z.citation(frame)
    local pframe = frame:getParent()
    
    local args = {};
    for k, v in pairs( pframe.args ) do
        if v ~= '' then
            args[k] = v;
        elseif k == 'postscript' then
            args[k] = v;
        end        
    end    

    local config = {};
    for k, v in pairs( frame.args ) do
        config[k] = v;
    end    
    
    return citation0( config, args)
end

return z
---------------------------------------------------------------------
--NOTES
--
-- NOTE A1: This Lua module was originally designed to handle a mix
--      of citation styles, crossing Vancouver style with Wikipedia's
--      local Citation Style 1 (CS1) from {Template:Citation/core}.
--      However, the conflicting positions of parameters, scattered
--      in twisted locations across this module, led to a separate
--      variation just to untangle the CS1 format of citations.
--
-- NOTE D2: The placement of dots and other separators between the
--      displayed parameters has been a continual headache, to keep
--      coordinated with the data in parentheses "(data)". There
--      has been a need to pre-check for the existence of related
--      options, to keep from putting double-dots ".." in some cases.
--      In particular, the omission of the "title=" parameter has led
--      to several cases of a spurious dot ". ." because the original
--      design had treated the title as a mandatory parameter.
--
------------------------------------------------------------------------
--HISTORY:
--18Oct2012 Fixed lead-space in Chapter by omitting " ".
--18Oct2012 Fixed lead-space in Chapter/Title as end " " of Authors/Date/...
--19Oct2012 Put HISTORY comments to log major changes (not typos).
--19Oct2012 Fixed extra dot ".." in Title by omitting at end of "tcommon=...".
--19Oct2012 For pages, put &nbsp in "p.&nbsp;" etc.
--19Oct2012 Enhanced "pages=" to detect lone page as "p." else "pp." prefix.
--19Oct2012 Fixed to show "." after Periodical name (work, newspaper...).
--19Oct2012 Fixed web-link to have spaces "[...  Archived] from the original".
--19Oct2012 Fixed to show ";" between authors & coauthors.
--19Oct2012 Fixed to omit extra "." after coauthors.
--20Oct2012 Fixed COinS data to not urlencode all, as "ctx_ver=Z39.88-2004"
--20Oct2012 Fixed COinS to not end as "&" but use lead "&rft...=" form.
--20Oct2012 Fixed COinS to not url.encode page's "rfr_id=..." pagename.
--20Oct2012 Fixed COinS data when "web" to default to rft.genre "book".
--05Nov2012 Add a span wrapper even when there is no Ref parameter
--15Feb2013 Added Agency for "agency=xx".
--19Feb2013 Put NOTES comments to explain module operation.
--19Feb2013 Copied as Module:Citation/CS1 to alter to match wp:CS1 form.
--19Feb2013 Changed OrigYear to use [__] for CS1 style.
--19Feb2013 Fixed to not show duplicate Publisher/Agency.
--19Feb2013 Moved page-number parameters to after final date.
--19Feb2013 Fixed to not put double-dots after title again.
--20Feb2013 Changed to omit dot "." if already ends with dot.
--20Feb2013 If class "journal" shows Publisher after Periodical/Series.
--20Feb2013 Shifted Format to after Language, and Others after Volume.
--20Feb2013 Set AccessDate + <span class="reference-accessdate">
--20Feb2013 Fixed url when deadurl=no.
--20Feb2013 Added sepc for separator character between parameters.
--20Feb2013 Put "OCLC" for "Online Computer Library Center".
--20Feb2013 Fix empty "authorlink=" as person.link ~= "".
--20Feb2013 Added space after AuthorSep & AuthorNameSep.
--21Feb2013 Added args.contributor (was missing parameter).
--21Feb2013 Fixed EditorSep (was misspelled "EdithorSep").
--21Feb2013 Set OCinSdata.rft_val_fmt = "info:ofi/fmt:kev:mtx:book"
--21Feb2013 Checked to omit blank codes (asin= | doi= etc.).
--21Feb2013 Set enddot to end line if not config.CitationClass "citation".
--21Feb2013 Fixed to show "issn=x" as the ISSN code.
--21Feb2013 Fixed to show "id=x" after Zbl code.
--21Feb2013 Changed to omit double-dot before date when already dot.
--21Feb2013 Order config.CitationClass "citation": Volume, Issue, Publisher.
--21Feb2013 Put warning "Bad DOI (expected "10."..)" in DOI result.
--21Feb2013 Automatically unbolded volume+comma when > 4 long.
--21Feb2013 Changed to allow lowercase "asin-tld".
--22Feb2013 Fixed ref=harv to extract Year from Date.
--22Feb2013 Set Harvard refer. span id if config.CitationClass "citation".
--22Feb2013 Fixed config.CitationClass "citation" as span class="citation".
--22Feb2013 Capitalized "Archived/Retrieved" only when sepc is dot ".".
--23Feb2013 Fixed author editor for "in" or "In" and put space after sepc.
--23Feb2013 Changed to omit dot in "et al." when sepc is "." separator.
--23Feb2013 Fixed "author1-first" to also get args.given or args.given1.
--23Feb2013 Fixed args.article to set Title, after Periodical is Title.
--23Feb2013 Fixed to allow blank Title (such as "contribution=mytitle").
--23Feb2013 Fixed double-dot ".." at end of Editors list
--26Feb2013 Moved "issue=" data to show before "page=".
--26Feb2013 Moved "type=" data to show after "format=".
--26Feb2013 For "pmc=" link, omitted suffix "/?tool=pmcentrez".
--27Feb2013 For coauthors, omitted extra separator after authors.
--27Feb2013 For date, allowed empty date to use month/day/year.
--27Feb2013 Fixed double-dot ".." at end of authors/coauthors list.
--27Feb2013 Reset editor suffix as ", ed." when date exists.
--27Feb2013 Removed duplicate display of "others=" data.
--27Feb2013 Removed parentheses "( )" around "department" TitleNote.
--05Mar2013 Moved Language to follow Periodical or Series.
--05Mar2013 Fixed Edition to follow Series or Volume.
--05Mar2013 Fixed class encyclopaedia to show article as quoted Chapter.
--05Mar2013 Fixed class encyclopaedia to show page as "pp." or "p.".
--07Mar2013 Changed class encyclopaedia to omit "( )" around publisher.
--07Mar2013 Fixed end double-dot by string.sub(idcommon,-1,-1) was "-1,1".
--13Mar2013 Removed enddot "." after "quote=" parameter.
--13Mar2013 Changed config.CitationClass "news" to use "p." page format.
--13Mar2013 Fixed missing "location=" when "web" or "encyclopaedia".
--14Mar2013 Fixed end double-dot after book/work title.
--14Mar2013 Fixed double-dot before "p." or "pp." page number.
--14Mar2013 Fixed config.CitationClass "book" to use p./pp. page.
--18Mar2013 Fixed "page=" to override "pages=" as in markup-based cites.
--19Mar2013 Fixed date of class=journal Periodical to show after page.
--19Mar2013 Changed null "postscript=" to suppress end-dot of citation.
--20Mar2013 If CitationClass is journal, show "others=" before title.
--20Mar2013 If CitationClass is book, show "others=" before edition.
--20Mar2013 If CitationClass is journal, adjust "others=" to have sepc.
--20Mar2013 For class "journal", use book format unless Periodical set.
--
--End