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require('strict'); local getArgs = require ('Module:Arguments').getArgs;   --[[--------------------------< A R G S _ D E F A U L T >------------------------------------------------------  a table to specify initial values.  ]]  local args_default = { bracket_left = '', bracket_right = '', bracket_year_left = '', bracket_year_right = '', postscript = '', page = '', pages = '', location = '', page_sep = ", p.&nbsp;", pages_sep = ", pp.&nbsp;", ref = '', template = 'harv',-- if template name not provided in {{#invoke:}} use this };   --[[--------------------------< T A R G E T _ C H E C K >------------------------------------------------------  look for anchor_id (CITEREF name-list and year or text from |ref=) in anchor_id_list  the 'no target' error may be suppressed with |ignore-err=yes when target cannot be found because target is inside a template that wraps another template; 'multiple targets' error may not be suppressed  ]]  local function target_check (anchor_id, args) local namespace = mw.title.getCurrentTitle().namespace; local anchor_id_list_module = mw.loadData ('Module:Footnotes/anchor_id_list'); local anchor_id_list = anchor_id_list_module.anchor_id_list; local article_whitelist = anchor_id_list_module.article_whitelist; local template_list = anchor_id_list_module.template_list;  local whitelist_module = mw.loadData ('Module:Footnotes/whitelist'); local whitelist = whitelist_module.whitelist; local special_patterns = whitelist_module.special_patterns; local DNB_special_patterns = whitelist_module.DNB_special_patterns; local DNB_template_names = whitelist_module.DNB_template_names;  if 10 == namespace then return '';-- automatic form of |no-tracking=yes; TODO: is this too broad? end  local tally = anchor_id_list[anchor_id];-- nil when anchor_id not in list; else a tally local msg; local category;  if not tally then if args.ignore then return '';-- if ignore is true then no message, no category end  if article_whitelist and article_whitelist[anchor_id] then-- if an article-local whitelist and anchor ID is in it return '';-- done end  local wl_anchor_id = anchor_id;-- copy to be modified to index into the whitelist  if args.year then-- for anchor IDs created by this template (not in |ref=) that have a date if args.year:match ('%d%l$') or-- use the date value to determine if we should remove the disambiguator args.year:match ('n%.d%.%l$') or args.year:match ('nd%l$') then wl_anchor_id = wl_anchor_id:gsub ('%l$', '');-- remove the disambiguator end end  local t_tbl = whitelist[wl_anchor_id];-- get list of templates associated with this anchor ID  if t_tbl then-- when anchor ID not whitelisted t_tbl is nil for _, t in ipairs (t_tbl) do-- spin through the list of templates associated with this anchor ID if template_list[t] then-- if associated template is found in the list of templates in the article return '';-- anchor ID is whitlisted and article has matching template so no error end end end  for _, pattern in ipairs (special_patterns) do-- spin through the spcial patterns and try to match if anchor_id:match (pattern) then return ''; end end  for _, dnb_t in ipairs (DNB_template_names or {}) do-- getting desparate now, are there any DNB templates? DNB_template_names may be nil; empty table prevents script error if template_list[dnb_t] then-- if the article has this DNB template for _, pattern in ipairs (DNB_special_patterns) do-- spin through the DNB-specifiec wildcard patterns if anchor_id:match (pattern) then-- and attempt a match return '';-- found a match end end end end  msg = 'no target: ' .. anchor_id;-- anchor_id not found category = '[[Category:Harv and Sfn no-target errors]]';  elseif 1 < tally then msg = 'multiple targets (' .. tally .. '×): ' .. anchor_id;-- more than one anchor_id in this article category = 0 == namespace and '[[Category:Harv and Sfn multiple-target errors]]' or '';-- only categorize in article space return '<span class="error harv-error" style="display: inline; font-size:100%"> ' .. args.template .. ' error: ' .. msg .. ' ([[:Category:Harv and Sfn template errors|help]])</span>' .. category; end  --category = 0 == namespace and '[[Category:Harv and Sfn template errors]]' or '';-- only categorize in article space category = 0 == namespace and category or '';-- only categorize in article space  --use this version to show error messages --return msg and '<span class="error harv-error" style="display: inline; font-size:100%"> ' .. args.template .. ' error: ' .. msg .. ' ([[:Category:Harv and Sfn template errors|help]])</span>' .. category or ''; --use this version to hide error messages return msg and '<span class="error harv-error" style="display: none; font-size:100%"> ' .. args.template .. ' error: ' .. msg .. ' ([[:Category:Harv and Sfn template errors|help]])</span>' .. category or '';  end   --[[--------------------------< I S _ Y E A R >----------------------------------------------------------------  evaluates param to see if it is one of these forms with or without lowercase letter disambiguator: YYYY n.d. nd c. YYYY YYYY–YYYY(separator is endash) YYYY–YY(separator is endash)  return true when param has a recognized form; false else  ]]  local patterns_date= { '^%d%d%d%d?%l?$', '^n%.d%.%l?$', '^nd%l?$', '^c%. %d%d%d%d?%l?$', '^%d%d%d%d–%d%d%d%d%l?$', '^%d%d%d%d–%d%d%l?$', }  local function is_year (param, args) args.year = '';-- used for harv error;   for _, pattern in ipairs (patterns_date) do if mw.ustring.match (param, pattern) then args.year = param;-- used for harv error;  return true; end end end   --[[--------------------------< C O R E >----------------------------------------------------------------------  returns an anchor link (CITEREF) formed from one to four author names, year, and insource location (|p=, |pp=, loc=)  ]]  local function core( args ) local result; local err_msg = ''  if args.P5 ~= '' then if is_year (args.P5, args) then result = table.concat ({args.P1, ' et al. ', args.bracket_year_left, args.P5, args.bracket_year_right}); else args.P5 = '';-- when P5 not a year don't include in anchor result = table.concat ({args.P1, ' et al.'});-- and don't render it end  elseif args.P4 ~= '' then if is_year (args.P4, args) then result = table.concat ({args.P1, ', ', args.P2, ' &amp; ', args.P3, ' ', args.bracket_year_left, args.P4, args.bracket_year_right});-- three names and a year else result = table.concat ({args.P1, ' et al.'});-- four names end  elseif args.P3 ~= '' then if is_year (args.P3, args) then result = table.concat ({args.P1, ' &amp; ', args.P2, ' ', args.bracket_year_left, args.P3, args.bracket_year_right});-- two names and a year else result = table.concat ({args.P1, ', ', args.P2, ' ', ' &amp; ', args.P3});-- three names end  elseif args.P2 ~= '' then if is_year (args.P2, args) then result = table.concat ({args.P1, ' ', args.bracket_year_left, args.P2, args.bracket_year_right});-- one name and year else result = table.concat ({args.P1, ' &amp; ', args.P2});-- two names end  else result = args.P1;-- one name end -- when author-date result ends with a dot (typically when the last positional parameter holds 'n.d.') -- and when no in-source location (no |p=, |pp=, or |loc=) -- and when the first or only character in args.postscript is a dot -- remove the author-date result trailing dot -- the author-date result trailing dot will be replaced later with the content of args.postscript (usually a dot) if ('.' == result:sub(-1)) and ('.' == args.postscript:sub(1)) and ('' == args.page) and ('' == args.pages) and ('' == args.location) then result = result:gsub ('%.$', ''); end  if args.ref ~= 'none' then local anchor_id; if args.ref ~= '' then anchor_id = mw.uri.anchorEncode (args.ref); err_msg = target_check (anchor_id, args); result = table.concat ({'[[#', anchor_id, '|', result, ']]'}); else anchor_id = mw.uri.anchorEncode (table.concat ({'CITEREF', args.P1, args.P2, args.P3, args.P4, args.P5})); err_msg = target_check (anchor_id, args); result = table.concat ({'[[#', anchor_id, '|', result, ']]'}); end end  if args.page ~= '' then result = table.concat ({result, args.page_sep, args.page}); elseif args.pages ~= ''then result = table.concat ({result, args.pages_sep, args.pages}); end  if args.location ~= '' then result = table.concat ({result, ', ', args.location}); end  result = table.concat ({args.bracket_left, result, args.bracket_right, args.postscript}):gsub ('%s+', ' ');-- strip redundant spaces return result .. err_msg; end   --[[--------------------------< H Y P H E N _ T O _ D A S H >--------------------------------------------------  Converts a hyphen to a dash under certain conditions. The hyphen must separate like items; unlike items are returned unmodified. These forms are modified: letter - letter (A - B) digit - digit (4-5) digit separator digit - digit separator digit (4.1-4.5 or 4-1-4-5) letterdigit - letterdigit (A1-A5) (an optional separator between letter and digit is supported – a.1-a.5 or a-1-a-5) digitletter - digitletter (5a - 5d) (an optional separator between letter and digit is supported – 5.a-5.d or 5-a-5-d)  any other forms are returned unmodified.  str may be a comma- or semicolon-separated list  This code copied from Module:Citation/CS1. The only modification is to require Module:Citation/CS1/Utilities so that it has access to the functions is_set() and has_accept_as_written()  ]]  local function hyphen_to_dash( str ) local utilities = require ('Module:Citation/CS1/Utilities');-- only modification so that this function has access to is_set() and has_accept_as_written()  if not utilities.is_set (str) then return str; end  local accept; -- Boolean  str = str:gsub ('&[nm]dash;', {['&ndash;'] = '–', ['&mdash;'] = '—'});-- replace &mdash; and &ndash; entities with their characters; semicolon mucks up the text.split str = str:gsub ('&#45;', '-'); -- replace HTML numeric entity with hyphen character  str = str:gsub ('&nbsp;', ' '); -- replace &nbsp; entity with generic keyboard space character  local out = {}; local list = mw.text.split (str, '%s*[,;]%s*');-- split str at comma or semicolon separators if there are any  for _, item in ipairs (list) do-- for each item in the list item, accept = utilities.has_accept_as_written (item);-- remove accept-this-as-written markup when it wraps all of item if not accept and mw.ustring.match (item, '^%w*[%.%-]?%w+%s*[%-–—]%s*%w*[%.%-]?%w+$') then-- if a hyphenated range or has endash or emdash separators if item:match ('^%a+[%.%-]?%d+%s*%-%s*%a+[%.%-]?%d+$') or-- letterdigit hyphen letterdigit (optional separator between letter and digit) item:match ('^%d+[%.%-]?%a+%s*%-%s*%d+[%.%-]?%a+$') or-- digitletter hyphen digitletter (optional separator between digit and letter) item:match ('^%d+[%.%-]%d+%s*%-%s*%d+[%.%-]%d+$') or-- digit separator digit hyphen digit separator digit item:match ('^%d+%s*%-%s*%d+$') or-- digit hyphen digit item:match ('^%a+%s*%-%s*%a+$') then-- letter hyphen letter item = item:gsub ('(%w*[%.%-]?%w+)%s*%-%s*(%w*[%.%-]?%w+)', '%1–%2');-- replace hyphen, remove extraneous space characters else item = mw.ustring.gsub (item, '%s*[–—]%s*', '–');-- for endash or emdash separated ranges, replace em with en, remove extraneous whitespace end end table.insert (out, item);-- add the (possibly modified) item to the output table end  local temp_str = '';-- concatenate the output table into a comma separated string temp_str, accept = utilities.has_accept_as_written (table.concat (out, ', ')); -- remove accept-this-as-written markup when it wraps all of concatenated out if accept then temp_str = utilities.has_accept_as_written (str);-- when global markup removed, return original str; do it this way to suppress boolean second return value return temp_str; else return temp_str;-- else, return assembled temp_str end end   --[[--------------------------< A R G S _ F E T C H >---------------------------------------------------------  Because all of the templates share a common set of parameters, a single common function to fetch those parameters from frame and parent frame.  ]]  local function args_fetch (frame, ps) local args = args_default;-- create a copy of the default table local pframe = frame:getParent();-- point to the template's parameter table  for k, v in pairs (frame.args) do-- override defaults with values provided in the #invoke: if any args[k] = v; end  args.postscript = pframe.args.postscript or pframe.args.ps or ps; if 'none' == args.postscript then args.postscript = ''; end args.page = pframe.args.p or pframe.args.page or ''; args.pages = pframe.args.pp or pframe.args.pages or ''; args.pages = ('' ~= args.pages) and hyphen_to_dash (args.pages) or ''; args.location = pframe.args.loc or ''; args.ref = pframe.args.ref or pframe.args.Ref or ''; args.ignore = ('yes' == pframe.args['ignore-false-positive']) or ('yes' == pframe.args['ignore-err']);  for i, v in ipairs ({'P1', 'P2', 'P3', 'P4', 'P5'}) do-- loop through the five positional parameters and trim if set else empty string args[v] = (pframe.args[i] and mw.text.trim (pframe.args[i])) or ''; end  if args.P5 and not is_year (args.P5, args) then local i = 6;-- initialize the indexer to the sixth positional parameter while pframe.args[i] do-- in case there are too many authors loop through the authors looking for a year local v = mw.text.trim (pframe.args[i]);-- trim if is_year (v, args) then-- if a year args.P5 = v;-- overwrite whatever was in args.P5 with year break;-- and abandon the search end i = i + 1;-- bump the indexer end end return args; end   --[[--------------------------< H A R V A R D _ C I T A T I O N >----------------------------------------------  common entry point for: {{harvard citation}} aka {{harv}} {{Harvard citation no brackets}} aka {{harvnb}} {{harvcol}} {{harvcolnb}} {{harvcoltxt}} {{Harvard citation text}} aka {{harvtxt}} {{Harvp}}  Distinguishing features (brackets and page separators) are specified in this module's {{#invoke}} in the respective templates.  ]]  local function harvard_citation (frame) local args = args_fetch (frame, '');-- get the template and invoke parameters; default postscript is empty string  return core (args); end   --[[--------------------------< S T R I P _ U R L >------------------------------------------------------------  used by sfn() and sfnm(). This function fixes an issue with reference tooltip gadget where the tooltip is not displayed when an insource locator (|p=, |pp=, |loc=) has an external wikilink that contains a # character  strip uri-reserved characters from urls in |p=, |pp-, and |loc= parameters The researved characters are: !#$&'()*+,/:;=?@[]  ]]  local function strip_url (pages) local escaped_uri; if not pages or ('' == pages) then return pages; end  for uri in pages:gmatch ('%[(%a[%w%+%.%-]*://%S+)') do-- for each external link get the uri escaped_uri = uri:gsub ("([%(%)%.%%%+%-%*%?%[%^%$%]])", "%%%1" );-- save a copy with lua pattern characters escaped uri = uri:gsub ("[!#%$&'%(%)%*%+,/:;=%?@%[%]%.%%]", '');-- remove reserved characters and '%' because '%20' (space character) is a lua 'invalid capture index' pages = pages:gsub (escaped_uri, uri, 1);-- replace original uri with the stripped version end  return pages; end   --[[--------------------------< S F N >------------------------------------------------------------------------  entry point for {{sfn}} and {{sfnp}}  ]]  local function sfn (frame) local args = args_fetch (frame, '.');-- get the template and invoke parameters; default postscript is a dot  local result = core (args);-- go make a CITEREF anchor -- put it all together and then strip redundant spaces local name = table.concat ({'FOOTNOTE', args.P1, args.P2, args.P3, args.P4, args.P5, strip_url (args.page), strip_url (args.pages), strip_url (args.location)}):gsub ('%s+', ' ');  return frame:extensionTag ({name='ref', args={name=name}, content=result});   end   --[[--------------------------< S F N M >----------------------------------------------------------------------  common entry point for {{sfnm}} and {{sfnmp}}  Distinguishing features (brackets) are specified in this module's {{#invoke}} in the respective templates.  ]]  local function sfnm (frame) local args = args_default;-- create a copy of the default table local pframe = frame:getParent();-- point to the template's parameter table  local n = 1;-- index of source; this is the 'n' in na1, ny, etc local first_pnum = 1;-- first of a pair of positional parameters local second_pnum = 2;-- second of a pair of positional parameters  local last_ps = 0;-- index of the last source with |nps= set local last_index = 0;-- index of the last source; these used to determine which of |ps= or |nps= will terminate the whole rendering  local out = {};-- table to hold rendered sources local footnote = {'FOOTNOTE'};-- all author, date, insource location stuff becomes part of the reference's footnote id; added as we go  for k, v in pairs (frame.args) do-- override defaults with values provided in the #invoke: if any args[k] = v; end  while true do if not pframe.args[table.concat ({n, 'a1'})] and not pframe.args[first_pnum] then break;-- no na1 or matching positional parameter so done end  if pframe.args[table.concat ({n, 'a1'})] then-- does this source use named parameters? for _, v in ipairs ({'P1', 'P2', 'P3', 'P4', 'P5'}) do-- initialize for this source args[v] = ''; end  for i, v in ipairs ({'P1', 'P2', 'P3', 'P4', 'P5'}) do-- extract author and year parameters for this source args[v] = pframe.args[table.concat ({n, 'a', i})] or '';-- attempt to assign author name if '' == args[v] then-- when there wasn't an author name args[v] = pframe.args[table.concat ({n, 'y'})] or '';-- attempt to assign year break;-- done with author/date for this source end end  else-- this source uses positional parameters args.P1 = mw.text.trim (pframe.args[first_pnum]);-- yes, only one author supported args.P2 = (pframe.args[second_pnum] and mw.text.trim (pframe.args[second_pnum])) or '';-- when positional author, year must also be positional  for _, v in ipairs ({'P3', 'P4', 'P5'}) do-- blank the rest of these for this source args[v] = ''; end  first_pnum = first_pnum + 2;-- source must use positional author and positional year second_pnum = first_pnum + 1;-- bump these for possible next positional source end  args.postscript = pframe.args[table.concat ({n, 'ps'})] or ''; if 'none' == args.postscript then-- this for compatibility with other footnote templates; does nothing args.postscript = ''; end  args.ref = pframe.args[table.concat ({n, 'ref'})] or '';-- alternate reference for this source  args.page = pframe.args[table.concat ({n, 'p'})] or '';-- insource locations for this source args.pages = pframe.args[table.concat ({n, 'pp'})] or ''; args.pages = ('' ~= args.pages) and hyphen_to_dash (args.pages) or ''; args.location = pframe.args[table.concat ({n, 'loc'})] or ''; args.ignore = ('yes' == pframe.args[table.concat ({n, 'ignore-false-positive'})]) or ('yes' == pframe.args[table.concat ({n, 'ignore-err'})]);  table.insert (out, core (args));-- save the rendering of this source  for k, v in ipairs ({'P1', 'P2', 'P3', 'P4', 'P5'}) do-- create the FOOTNOTE id if '' ~= args[v] then table.insert (footnote, args[v]); end end for k, v in ipairs ({'page', 'pages', 'location'}) do-- these done separately so that we can strip uri-reserved characters from extlinked page numbers  if '' ~= args[v] then table.insert (footnote, strip_url (args[v])) end end  last_index = n;-- flags used to select terminal postscript from nps or from end_ps if '' ~= args.postscript then last_ps = n; end  n = n+1;-- bump for the next one end  local name = table.concat (footnote):gsub ('%s+', ' ');-- put the footnote together and strip redundant space  args.end_ps = pframe.args.postscript or pframe.args.ps or '.';-- this is the postscript for the whole not for the individual sources if 'none' == args.end_ps then-- not an original sfnm parameter value; added for compatibility with other footnote templates args.end_ps = ''; end  local result = table.concat ({table.concat (out, '; '), (last_index == last_ps) and '' or args.end_ps}); return frame:extensionTag ({name='ref', args={name=name}, content=result}); end   --[[--------------------------< S F N R E F >------------------------------------------------------------------  implements {{sfnref}}  ]]  local function sfnref (frame) local args = getArgs (frame); local out = {};  for i=1, 5 do-- get the first five args if there are five args if args[i] then out[i] = args[i]; else break;-- less than 5 args break out end end  if 5 == #out then-- when we have seen five args there may bemore local i = 6;-- initialize the indexer to the sixth positional parameter while args[i] do-- in case there are too many authors loop through the authors looking for a year if is_year (args[i], args) then-- if a year out[5] = args[i];-- overwrite whatever was in args[5] with year break;-- and abandon the search end i = i + 1;-- bump the indexer end end  return mw.uri.anchorEncode ('CITEREF' .. table.concat (out)); end   --[[--------------------------< E X P O R T E D F U N C T I O N S >------------------------------------------ ]]  return { harvard_citation = harvard_citation, sfn = sfn, sfnm = sfnm, sfnref = sfnref, };