Module:Footnote

require('Module:No globals');

--[[--< 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. ", pages_sep = ", pp. ", ref = '', };

--[[--< 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)

return true when param has a recognized form; false else

]]

local function is_year (param) return param:match ('^%d%d%d%d?%l?$') or param:match ('^n%.d%.%l?$') or param:match ('^nd%l?$') or param:match ('^c%. %d%d%d%d?%l?$') or param:match ('^%d%d%d%d–%d%d%d%d%l?$'); 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;

if args.P5 ~= '' then if is_year (args.P5) 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) 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) 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) 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 if args.ref ~= '' then result = table.concat ({, result, }); else result = table.concat ({, 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; 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.location = pframe.args.loc or ''; args.ref = pframe.args.ref or pframe.args.Ref or ''; 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

return args; end

--[[--< H A R V A R D _ C I T A T I O N >--

common entry point for: aka aka aka

Distinguishing features (brackets and page separators) are specified in this module's 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 and

]]

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 and

Distinguishing features (brackets) are specified in this module's 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.location = pframe.args[table.concat ({n, 'loc'})] or '';

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

----< E X P O R T  T A B L E >--

return { harvard_citation = harvard_citation, sfn = sfn, sfnm = sfnm, };