require('Module:No globals')  local citeq = {}  --[[--------------------------< I S _ S E T >------------------------------------------------------------------  Returns true if argument is set; false otherwise. Argument is 'set' when it exists (not nil) or when it is not an empty string.  ]] local function is_set( var )  return not (var == nil or var == ''); end   --[=[-------------------------< G E T _ N A M E _ L I S T >----------------------------------------------------  get_name_list -- adapted from getAuthors code taken from [[Module:RexxS]] arguments:  nl_type - type of name list to fetch: nl_type = 'author' for authors; 'editor' for editors  args - pointer to the parameter arguments table from the template call  qid - value from |qid= parameter; the Q-id of the source (book, etc.) in qid  wdl - value from the |wdlinks= parameter; a boolean passed to enable links to Wikidata when no article exists  returns nothing; modifies the args table  ]=]  local function get_name_list (nl_type, args, qid, wdl)  local propertyID = "P50"  local fallbackID = "P2093" -- author name string   if 'author' == nl_type then  propertyID = 'P50'; -- for authors  fallbackID = 'P2093';  elseif 'editor' == nl_type then  propertyID = 'P98'; -- for editors  fallbackID = nil;  else  return; -- not specified so return  end   -- wdlinks is a boolean passed to enable links to Wikidata when no article exists  -- if "false" or "no" or "0" is passed set it false  -- if nothing or an empty string is passed set it false  if wdl and (#wdl > 0) then  wdl = wdl:lower()  wdl = (wdl == "false") or (wdl == "no") or (wdl == "0")  else  -- wdl is empty, so  wdl = false  end   local entity = mw.wikibase.getEntity(qid)  local props = nil  local fallback = nil  if entity and entity.claims then  props = entity.claims[propertyID]  if fallbackID then  fallback = entity.claims[fallbackID]  end  end   -- Make sure it actually has at least one of the properties requested  if not (props and props[1]) and not (fallback and fallback[1]) then  return nil  end   -- So now we have something to return:  -- table 'out' is going to store the names(s):  -- and table 'link' will store any links to the name's article  local out = {}  local link = {}  local maxpos = 0  if props and props[1] then  for k, v in pairs(props) do  local qnumber = "Q" .. v.mainsnak.datavalue.value["numeric-id"]  local sitelink = mw.wikibase.sitelink(qnumber)  local label = mw.wikibase.label(qnumber)  if label then  label = mw.text.nowiki(label)  else  label = qnumber  end  local position = maxpos + 1 -- Default to 'next' author.  -- use P1545 (series ordinal) instead of default position.  if v["qualifiers"] and v.qualifiers["P1545"] and v.qualifiers["P1545"][1] then  position = tonumber(v.qualifiers["P1545"][1].datavalue.value)  end  maxpos = math.max(maxpos, position)  if sitelink then  -- just the plain name,  -- but keep a record of the links, using the same index  out[position] = label  link[position] = sitelink  else  -- no sitelink, so check first for a redirect with that label  -- this code works, but causes the article to appear in WhatLinksHere for the possible destination, so remove  -- local artitle = mw.title.new(label, 0)  -- if artitle.id > 0 then  -- if artitle.isRedirect then  -- no sitelink,  -- but there's a redirect with the same title as the label;  -- so store the link to that  -- out[position] = label  -- link[position] = label  -- else  -- no sitelink and not a redirect but an article exists with the same title as the label  -- that's probably a dab page, so output the plain label  -- out[position] = label  -- end  --else  -- no article or redirect with the same title as the label  if wdl then  -- show that there's a Wikidata entry available  out[position] = "[[:d:Q" .. v.mainsnak.datavalue.value["numeric-id"] .. "|" .. label .. "]]&nbsp;<span title='" .. i18n["errors"]["local-article-not-found"] .. "'>[[File:Wikidata-logo.svg|16px|alt=|link=]]</span>"  else  -- no wikidata links wanted, so just give the plain label  out[position] = label  end  -- end  end  end  end  if fallback and fallback[1] then  -- Fallback to name-only authors / editors  for k, v in pairs(fallback) do  local label = v.mainsnak.datavalue["value"]  local position = maxpos + 1 -- Default to 'next' author.  -- use P1545 (series ordinal) instead of default position.  if v["qualifiers"] and v.qualifiers["P1545"] and v.qualifiers["P1545"][1] then  position = tonumber(v.qualifiers["P1545"][1].datavalue.value)  end  maxpos = math.max(maxpos, position)  out[position] = label  end  end   -- if there's anything to return, then insert the additions in the template arguments table  -- in the form |author1=firstname secondname |author2= ...  -- Renumber, in case we have inconsistent numbering  local keys = {}  for k,v in pairs(out) do  keys[#keys+1] = k  end  table.sort(keys) -- as they might be out of order  for i, k in ipairs(keys) do  mw.log(i.." "..k.." "..out[k])  args[nl_type .. i] = out[k] -- author-n or editor-n  if link[k] then  args[nl_type .. '-link' .. i] = link[k] -- author-linkn or editor-linkn  end  end end   --[[-------------------------< C I T E _ Q >------------------------------------------------------------------  Takes standard cs1|2 template parameters and passes all to {{citation}}. If neither of |author= and |author1= are set, calls get_authors() to try to get an author name-list from wikidata. The result is passed to  {{citation}} for rendering.  ]]  function citeq.cite_q (frame) local citeq_args = {}; local qid; local wdl;  local pframe = frame:getParent() local args = pframe.args; -- first get parent frame arguments - these from the template call   for k, v in pairs (args) do -- copy named parameters and their values into citeq_args  if type( k ) == 'string' then -- numbered parameters ignored  citeq_args[k] = v;  end  end   args = frame.args; -- now get frame arguments (from the template wikisource)    for k, v in pairs (args) do -- copy args into citeq_args  if 'qid' == k then -- don't copy qid  qid = v; -- save its value  elseif 'wdlinks' == k then -- don't copy wdlinks  wdl = v; -- save its value  else  citeq_args[k] = v -- but copy everything else  end  end   if is_set (qid) then  if not is_set (citeq_args.author) and not is_set (citeq_args.author1) then -- if neither are set, try to get authors from wikidata  get_name_list ('author', citeq_args, qid, wdl); -- modify citeq_args table with authors from wikidata  end   if not is_set (citeq_args.editor) and not is_set (citeq_args.editor1) then -- if neither are set, try to get editors from wikidata  get_name_list ('editor', citeq_args, qid, wdl); -- modify citeq_args table with editors from wikidata  end  end   return frame:expandTemplate{title = 'citation', args = citeq_args}; -- render the citation end  return citeq