Module:Navseasoncats

local p = {}

local errors = '' local nexistingcats = 0 local currtitle = mw.title.getCurrentTitle local testcasecolon = '' local testcases = string.match(currtitle.subpageText, '^testcases') if   testcases then testcasecolon = ':' end local navborder = true local followRs = true local listall = false local listofalllinks = {} local skipgaps = false local misctrackingcats = { '', -- [1] placeholder for '', -- [2] placeholder for '', -- [3] placeholder for '', -- [4] placeholder for '', -- [5] placeholder for '', -- [6] placeholder for '', -- [7] placeholder for '', -- [8] placeholder for '', -- [9] placeholder for '', --[10] placeholder for '', --[11] placeholder for '', --[12] placeholder for '', --[13] placeholder for '', --[14] placeholder for '', --[15] placeholder for '', --[16] placeholder for '', --[17] placeholder for '', --[18] placeholder for '', --[19] placeholder for } local avoidself = (currtitle.text ~= 'Navseasoncats' and          --avoid self					currtitle.text ~= 'Navseasoncats/doc' and      --avoid self					currtitle.text ~= 'Navseasoncats/sandbox' and  --avoid self					(currtitle.nsText ~= 'Template' or testcases)) --avoid nested transclusion errors (i.e. )

--========================================================================== --                     Utility & category functions --==========================================================================

--Error message handling --Also used by. function p.errorclass( msg ) return mw.text.tag( 'span', {class='error mw-ext-cite-error'}, 'Error! '..string.gsub(msg, '&#', '&amp;#') ) end

--Failure handling --Also used by. function p.failedcat( errors, sortkey ) if avoidself then return (errors or '')..'&#42;&#42;&#42;Navseasoncats failed to generate navbox***'.. ..(sortkey or 'O').. end return '' end

--Check for nav_* navigational isolation (not necessarily an error). --Used by all nav_*. function isolatedcat if nexistingcats == 0 and avoidself then misctrackingcats[11] = ''..testcasecolon..'Category:Navseasoncats isolated' end end --Similar to : make a piped link to a category, if it exists; --if it doesn't exist, just display the greyed link title without linking. --Follows s. --Returns { <#R target navelement>,  } if followed; --returns {, nil } otherwise. --Used by all nav_*. function catlinkfollowr( catname, displaytext, displayend ) catname    = mw.text.trim(catname or '') displaytext = mw.text.trim(displaytext or '') displayend = displayend or false --bool flag to override displaytext IIF the cat/target is terminal (e.g. "2021–") local grey = '#888' local disp = catname if displaytext ~= '' then --use 'displaytext' parameter if present disp = mw.ustring.gsub(displaytext, '%s+%(.+$', ); --strip any trailing disambiguator	end	local link, nilorR	local exists = mw.title.new( catname, 'Category' ).exists	if exists then		nexistingcats = nexistingcats + 1		if followRs then			local R = rtarget(catname)			local y, hyph = mw.ustring.match(R, '(%d+)([–-])$')			if displayend and y and hyph then				disp = y..hyph..' '..y..' ' --hidden y to match spacing			end			if R ~= catname then --#R followed				nilorR = R			end			link = ..disp..		else			link = ..disp..		end	else		link = ' '..disp..' '		--return { ..disp..'', nil } --for debugging	end	if listall then		if nilorR then --#R followed			table.insert( listofalllinks, 'Category:'..catname..' → '..'Category:'..nilorR..' ('..link..')' )		else --no #R			table.insert( listofalllinks, 'Category:'..catname..' ('..link..')' ) end end return { link, nilorR } end

--Returns the target of, if it exists, else returns the original cat. --Used by catlinkfollowr, and so indirectly by all nav_*. function rtarget( cat ) local catcontent = mw.title.new( cat or '', 'Category' ):getContent if string.match( catcontent or '', '{{ *[Cc]at' ) then local regex = { --the following 11 pages (7 condensed) redirect to Template:Category redirect (as of 6/2019): { '1', '{{ *[Cc]ategory *[Rr]edirect' }, --most likely match 1st { '2', '{{ *[Cc]at *redirect' },        --444+240 transclusions { '3', '{{ *[Cc]at *redir' },           --8+3 { '4', '{{ *[Cc]ategory *move' },       --6 { '5', '{{ *[Cc]at *red' },             --6 { '6', '{{ *[Cc]atr' },                 --4 { '7', '{{ *[Cc]at *move' },            --0 }		for k, v in pairs (regex) do			local rtarget = mw.ustring.match( catcontent, v[2]..'%s*|%s*([^|}]+)' ) if rtarget then rtarget = mw.ustring.gsub(rtarget, '^1%s*=%s*', '') rtarget = string.gsub(rtarget, '^[Cc]ategory:', '') return rtarget end end end return cat end

--Returns a numbered list of all s followed by catlinkfollowr -> rtarget. --Used by all nav_*. function listalllinks local nl = '\n# ' local out = '' if currtitle.nsText == 'Category' then errors = p.errorclass('The   parameter/utility '..							'should not be saved in category space, only previewed.') out = p.failedcat(errors, 'Z') end if listofalllinks[1] then return out..nl..table.concat(listofalllinks, nl) else return out..nl..'No links found!?' end end

--Returns an unsigned string of the 1-4 digit decade ending in "0", else error. --Used by nav_decade only. function sterilizedec( decade ) if decade == nil or decade == '' then return nil end local dec = string.match(decade, '^[-%+]?(%d?%d?%d?0)$') or 				string.match(decade, '^[-%+]?(%d?%d?%d?0)%D') if dec then return dec else --fix 2-4 digit decade local decade_fixed234 = string.match(decade, '^[-%+]?(%d%d?%d?)%d$') or								string.match(decade, '^[-%+]?(%d%d?%d?)%d%D') if decade_fixed234 then return decade_fixed234..'0' end --fix 1-digit decade local decade_fixed1  = string.match(decade, '^[-%+]?(%d)$') or								string.match(decade, '^[-%+]?(%d)%D') if decade_fixed1 then return '0' end --unfixable errors = 'sterilizedec error' return nil end end

--Check for nav_hyphen default gap size + isolatedcat (not necessarily an error). --Used by nav_hyphen only. function defaultgapcat( bool ) if bool and nexistingcats == 0 and avoidself then --using "nexistingcats > 0" isn't as useful, since the default gap size obviously worked misctrackingcats[12] = ''..testcasecolon..'Category:Navseasoncats default season gap size' end end

--12 -> 12th, etc. --Used by nav_nordinal, nav_wordinal, and. function p.addord( i ) if tonumber(i) then local s = tostring(i) local tens = string.match(s, '1%d$') if   tens then return s..'th' end local ones = string.match(s, '%d$') if    ones == '1' then return s..'st' elseif ones == '2' then return s..'nd' elseif ones == '3' then return s..'rd' end return s..'th' end return i end

--========================================================================== --                 Formerly separated templates/modules --==========================================================================

--==========================={{ nav_hyphen  }}=============================

function nav_hyphen( start, hyph, finish, firstpart, lastpart, minseas, maxseas, testgap ) --Expects a PAGENAME of the form "Some sequential 2015–16 example cat", where --	start    = 2015 --	hyph     = – --	finish   = 16 (sequential years can be abbreviated, but others should be full year, e.g. "2001–2005") --	firstpart = Some sequential --	lastpart = example cat --	minseas  = 1800 ('min' starting season shown; optional) --	maxseas  = 2000 ('max' starting season shown; optional; 2000 will show 2000-01) --	testgap  = 0 (testcasegap parameter for easier testing; optional) --sterilize start if string.match(start or '', '^%d%d?%d?%d?$') == nil then --1-4 digits, AD only local start_fixed = mw.ustring.match(start or '', '^%s*(%d%d?%d?%d?)%D') if start_fixed then start = start_fixed else errors = p.errorclass('Function nav_hyphen can\'t recognize the number "'..(start or '')..'" '..								 'in the first part of the "season" that was passed to it. '..								  'For e.g. "2015–16", "2015" is expected via "|2015|–|16|".') return p.failedcat(errors, 'H') end end local nstart = tonumber(start) --en dash check if hyph ~= '–' then misctrackingcats[3] = ''..testcasecolon..'Category:Navseasoncats range not using en dash' --nav still processable, but track end --sterilize finish local regularparent = true if finish == 0 then regularparent = false --"Members of the Scottish Parliament 2021–" if maxseas == nil or maxseas == '' then maxseas = start --hide subsequent ranges end end if string.match(finish or '', '^%d+$') == nil then local finish_fixed = mw.ustring.match(finish or '', '^%s*(%d%d?%d?%d?)%D') if finish_fixed then finish = finish_fixed else errors = p.errorclass('Function nav_hyphen can\'t recognize "'..(finish or '')..'" '..								 'in the second part of the "season" that was passed to it. '..								  'For e.g. "2015–16", "16" is expected via "|2015|–|16|".') return p.failedcat(errors, 'I') end else if string.len(finish) >= 5 then errors = p.errorclass('The second part of the season passed to function nav_hyphen should only be four or fewer digits, not "'..(finish or '')..'". '..								 'See MOS:DATERANGE for details.') return p.failedcat(errors, 'J') end end local nfinish = tonumber(finish) --sterilize min/max local nminseas = tonumber(minseas) or -9999 --same behavior as nav_year local nmaxseas = tonumber(maxseas) or 9999 --same behavior as nav_year if nminseas > nstart then nminseas = nstart end if nmaxseas < nstart then nmaxseas = nstart end local lspace = ' ' --assume a leading space (most common) local tspace = ' ' --assume a trailing space (most common) if string.match(firstpart, '%($') then lspace =  end --DNE for "Madrid city councillors (2007–2011)"-type cats	if string.match(lastpart, '^%)') then tspace =  end --DNE for "Madrid city councillors (2007–2011)"-type cats --calculate term length/intRAseason size & finishing year local t = 1 while t <= 10 and regularparent do		local nish = nstart + t --use switchADBC to flip this sign to work for years BC		if nish == nfinish or string.match(nish, '%d?%d$') == finish then break end if t == 10 then errors = p.errorclass('Function nav_hyphen can\'t determine a reasonable term length for "'..start..hyph..finish..'".') return p.failedcat(errors, 'K') end t = t + 1 end --apply MOS:DATERANGE to parent local lenstart = string.len(start) local lenfinish = string.len(finish) if lenstart == 4 and regularparent then --"2001–..." if t == 1 then --"2001–02" & "2001–2002" both allowed if lenfinish ~= 2 and lenfinish ~= 4 then errors = p.errorclass('The second part of the season passed to function nav_hyphen should be two or four digits, not "'..finish..'".') return p.failedcat(errors, 'L') end else --"2001–2005" is required for t > 1; track "2001–05"; anything else = error if lenfinish == 2 then if avoidself then misctrackingcats[4] = ''..testcasecolon..'Category:Navseasoncats range abbreviated' end elseif lenfinish ~= 4 then errors = p.errorclass('The second part of the season passed to function nav_hyphen should be four digits, not "'..finish..'".') return p.failedcat(errors, 'M') end end if finish == '00' and avoidself then --full year required regardless of term length misctrackingcats[4] = ''..testcasecolon..'Category:Navseasoncats range abbreviated' end end --calculate intERseason gap size local hgap_default = 0 --assume & start at the most common case: 2001–02 -> 2002–03, etc.	local hgap_limit = 5 local hgap_success = false local hgap = hgap_default while hgap <= hgap_limit and regularparent do --verify local prevseason2 = firstpart..lspace..(nstart-t-hgap)..hyph..string.match(nstart-hgap, '%d?%d$')   ..tspace..lastpart local nextseason2 = firstpart..lspace..(nstart+t+hgap)..hyph..string.match(nstart+2*t+hgap, '%d?%d$')..tspace..lastpart local prevseason4 = firstpart..lspace..(nstart-t-hgap)..hyph..(nstart-hgap)   ..tspace..lastpart local nextseason4 = firstpart..lspace..(nstart+t+hgap)..hyph..(nstart+2*t+hgap)..tspace..lastpart if t == 1 then --test abbreviated range first, then full range if mw.title.new(prevseason2, 'Category').exists or --use 'or', in case we're at the edge of the cat structure, mw.title.new(nextseason2, 'Category').exists or --or we hit a "–00"/"–2000" situation on one side mw.title.new(prevseason4, 'Category').exists or			  mw.title.new(nextseason4, 'Category').exists then hgap_success = true break end elseif t > 1 then --test full range first, then abbreviated range if mw.title.new(prevseason4, 'Category').exists or --use 'or', in case we're at the edge of the cat structure, mw.title.new(nextseason4, 'Category').exists or --or we hit a "–00"/"–2000" situation on one side mw.title.new(prevseason2, 'Category').exists or 			  mw.title.new(nextseason2, 'Category').exists then hgap_success = true break end end hgap = hgap + 1 end if hgap_success == false then hgap = tonumber(testgap) or hgap_default --tracked via defaultgapcat end --preliminary scan to determine ir/regular spacing of nearby hgap=0 cats --to limit expensive function usage, MOS:DATERANGE alternation is not used --an irregular-term-length series should follow "YYYY..hyph..YYYY" throughout local iregs = 0 local iirregs = 0 local tirregs = {} if hgap <= hgap_limit then --keep this now-unnecessary if-block to isolate temp vars --find # of nav-visible regular-term-length cats local i = -3 while i <= 3 do			local from = nstart + i*(t+hgap) local to  = tostring(from+t) local full = firstpart..lspace..from..hyph..to..tspace..lastpart if i ~= 0 and mw.title.new( full, 'Category' ).exists then iregs = iregs + 1 end i = i + 1 end --find # of nav-visible irregular-term-length cats local bwanchor = nstart      --backwards anchor/common year local fwanchor = bwanchor + t --forwards anchor/common year local endfound = false local j = -3 while j <= 3 do			if j < 0 then --search backwards local k = 1 while k <= 10 do					local from = bwanchor - k					local to  = bwanchor local full = firstpart..lspace..from..hyph..to..tspace..lastpart if mw.title.new( full, 'Category' ).exists then iirregs = iirregs + 1 tirregs['from-'..iirregs] = from tirregs['to-'..iirregs] = to						bwanchor = from --ratchet down break end k = k + 1 end end if j > 0 and endfound == false then --search forwards local k = 0 while k <= 10 do					local from = fwanchor local to  = fwanchor + k					if k == 0 then to = '' end --see if end-cat exists local full = firstpart..lspace..from..hyph..to..tspace..lastpart if mw.title.new( full, 'Category' ).exists then tirregs['from'..j] = from tirregs['to'..j] = to						iirregs = iirregs + 1 if k == 0 then endfound = true --tentative else endfound = false fwanchor = to --ratchet up							break --only break on k > 0; old end-cat #Rs still exist like "Members of the Scottish Parliament 2011–" end end k = k + 1 end end j = j + 1 end --rm irreg table if not useful if iregs >= iirregs then tirregs = {} elseif avoidself then misctrackingcats[7] = ''..testcasecolon..'Category:Navseasoncats range irregular, no gaps' end end --begin navhyphen local navh = '{| class="toccolours hlist" style="text-align: center; margin: auto;"\n'..'|\n' local terminalcat = false local i = -3 while i <= 3 do		local from = nstart + i*(t+hgap) if tirregs['from'..i] then from = tonumber(tirregs['from'..i]) end local from2 = string.match(from, '%d?%d$') local to = tostring(from+t) if tirregs['to'..i] then to = tirregs['to'..i]		elseif regularparent == false and tirregs and i > 0 then to = tirregs['to-1'] --special treatment for parent terminal cats, since they have no natural 'to' end local to2 = string.match(to, '%d?%d$') local tofinal = (to2 or '')   --assume t=1 and abbreviated 'to' (the most common case) if t > 1 or                   --per MOS:DATERANGE (e.g. 1999-2004) (from2 - (to2 or from2)) > 0 --century transition exception (e.g. 1999–2000) then tofinal = (to or '')      --default to the MOS-correct format, in case no fallbacks found end --check existance of 4-digit, MOS-correct range, with abbreviation fallback if t > 1 and string.len(from) == 4 then --e.g. 1999-2004 --determine which link exists (full or abbr) local full = firstpart..lspace..from..hyph..tofinal..tspace..lastpart if not mw.title.new( full, 'Category' ).exists then local abbr = firstpart..lspace..from..hyph..to2..tspace..lastpart if mw.title.new( abbr, 'Category' ).exists then tofinal = (to2 or '') --rv to MOS-incorrect format; if full AND abbr DNE, then tofinal is still in its MOS-correct format end end elseif t == 1 then --full-year consecutive ranges are also allowed local abbr = firstpart..lspace..from..hyph..tofinal..tspace..lastpart --assume tofinal is in abbr format if not mw.title.new( abbr, 'Category' ).exists and tofinal ~= to then local full = firstpart..lspace..from..hyph..to..tspace..lastpart if mw.title.new( full, 'Category' ).exists then tofinal = (to or '') --if abbr AND full DNE, then tofinal is still in its abbr format (unless it's a century transition) end end end --populate navh if i ~= 0 then --left/right navh local orig = firstpart..lspace..from..hyph..tofinal..tspace..lastpart local disp = from..hyph..tofinal local catlink = catlinkfollowr(orig, disp, true) --force terminal cat display if terminalcat == false then terminalcat = (mw.ustring.match(disp, '%d+[–-]$') or false) end if catlink[2] and avoidself then --a was followed, figure out why local origbase = mw.ustring.gsub(orig,      '%d+[–-]%d+', '') local rtarbase = mw.ustring.gsub(catlink[2], '%d+[–-]%d+', '') if mw.ustring.match(orig, '%d+[–-]$') then origbase = mw.ustring.gsub(orig,      '%d+[–-]$', '') end if mw.ustring.match(catlink[2], '%d+[–-]$') then --finagle/overload terminalcat type to set tracking on 1st occurence only if terminalcat == false then terminalcat = 1 end rtarbase = mw.ustring.gsub(catlink[2], '%d+[–-]$', '') end origbase = mw.text.trim(origbase) rtarbase = mw.text.trim(rtarbase) if avoidself then if origbase ~= rtarbase then misctrackingcats[5] = ''..testcasecolon..'Category:Navseasoncats range redirected (base change)' elseif terminalcat == 1 then misctrackingcats[8] = ''..testcasecolon..'Category:Navseasoncats range redirected (end)' else local all4s = (mw.ustring.match(orig, '%d%d%d%d[–-]%d%d%d%d') and									  mw.ustring.match(catlink[2], '%d%d%d%d[–-]%d%d%d%d')) if all4s then misctrackingcats[10] = ''..testcasecolon..'Category:Navseasoncats range redirected (other)' else misctrackingcats[6] = ''..testcasecolon..'Category:Navseasoncats range redirected (MOS)' end end end end if terminalcat then if type(terminalcat) ~= 'boolean' then nmaxseas = from end --only want to do this once if type(terminalcat) == 'string' and catlink[2] == nil and avoidself then misctrackingcats[9] = ''..testcasecolon..'Category:Navseasoncats range unredirected (end)' end terminalcat = true --done finagling/overloading end if from >= 0 and nminseas <= from and from <= nmaxseas then navh = navh..'*'..catlink[1]..'\n' --in case irreg froms outpace reg froms, and are visible/grey after terminalcat instead of hidden if terminalcat then nmaxseas = nmaxseas - 50 end else local hidden = ' '..disp..' ' navh = navh..'*'..hidden..'\n' if listall then listofalllinks[#listofalllinks] = listofalllinks[#listofalllinks]..' ('..hidden..')' end end else --center navh if finish == 0 then finish = ' '..start..' ' end navh = navh..'*'..start..hyph..finish..'\n' end i = i + 1 end isolatedcat defaultgapcat(not hgap_success) if listall then return listalllinks else return navh..'|}' end end

--=========================={{ nav_tvseason  }}============================

function nav_tvseason( firstpart, tv, lastpart, maximumtv ) --Expects a PAGENAME of the form "Futurama (season 1) episodes", where --	firstpart = Futurama (season 	--	tv       = 1	--	lastpart  = ) episodes --	maximumtv = 7 ('max' tv season parameter; optional) tv = tonumber(tv) if tv == nil then errors = p.errorclass('Function nav_tvseason can\'t recognize the TV season number sent to its 2nd parameter.') return p.failedcat(errors, 'T') end local maxtv = tonumber(maximumtv) or 9999 --allow +/- qualifier if maxtv < tv then maxtv = tv end --input error; maxtv should be >= parent local loffset = 0 --left-offset --if tv <= 5 then loffset = 6 - tv end --commented to behave similarly to the other nav_* functions --begin navtvseason local navt = '{| class="toccolours hlist" style="text-align: center; margin: auto;"\n'..'|\n' local i = (-5 + loffset) while i <= (5 + loffset) do		local t = tv + i		if i ~= 0 then --left/right navt local catlink = catlinkfollowr( firstpart..' '..t..lastpart, t ) if (t >= 1 and t <= maxtv) then --hardcode mintv if catlink[2] and avoidself then --a was followed misctrackingcats[18] = ''..testcasecolon..'Category:Navseasoncats TV season redirected' end navt = navt..'*'..catlink[1]..'\n' else local hidden = ' '..'0'..' ' --'0' to maintain dot spacing navt = navt..'*'..hidden..'\n' if listall then listofalllinks[#listofalllinks] = listofalllinks[#listofalllinks]..' ('..hidden..')' end end else --center navt navt = navt..'*'..tv..'\n' end i = i + 1 end isolatedcat if listall then return listalllinks else return navt..'|}' end end

--==========================={{ nav_decade  }}=============================

function nav_decade( firstpart, decade, lastpart, mindecade, maxdecade ) --Expects a PAGENAME of the form "Some sequential 2000 example cat", where --	firstpart = Some sequential --	decade   = 2000 --	lastpart = example cat --	mindecade = 1800 ('min' decade parameter; optional) --	maxdecade = 2020 ('max' decade parameter; optional; defaults to next decade) --sterilize dec local dec = sterilizedec(decade) if errors ~= '' then errors = p.errorclass('Function nav_decade was sent "'..(decade or '')..'" as its 2nd parameter, '..							'but expects a 1 to 4-digit year ending in "0".') return p.failedcat(errors, 'D') end local ndec = tonumber(dec) --sterilize mindecade & determine AD/BC local mindefault = '-9999' local mindec = sterilizedec(mindecade) --returns a tostring(unsigned int), or nil + errors if mindec then if string.match(mindecade, '-%d') or 		  string.match(mindecade, 'BC') then mindec = '-'..mindec --better +/-0 behavior with strings (0-initialized int == "-0" string...) end elseif errors ~= '' then errors = p.errorclass('Function nav_decade was sent "'..(mindecade or '')..'" as its 4th parameter, '..							'but expects a 1 to 4-digit year ending in "0", the earliest decade to be shown.') return p.failedcat(errors, 'E') else mindec = mindefault --tonumber later, after error checks end --sterilize maxdecade & determine AD/BC local maxdefault = '9999' local maxdec = sterilizedec(maxdecade) --returns a tostring(unsigned int), or nil + error if maxdec then if string.match(maxdecade, '-%d') or 		  string.match(maxdecade, 'BC') then                    --better +/-0 behavior with strings (0-initialized int == "-0" string...), maxdec = '-'..maxdec --but a "-0" string -> tonumber -> tostring = "-0", end                     --and a  "0" string -> tonumber -> tostring =  "0" elseif errors ~= '' then errors = p.errorclass('Function nav_decade was sent "'..(maxdecade or '')..'" as its 5th parameter, '..							'but expects a 1 to 4-digit year ending in "0", the highest decade to be shown.') return p.failedcat(errors, 'F') else maxdec = maxdefault end local tspace = ' ' --assume trailing space for "1950s in X"-type cats if string.match(lastpart, '^-') then tspace = '' end --DNE for "1970s-related"-type cats --AD/BC switches & vars local parentBC = string.match(lastpart, '^BC') --following the "0s BC" convention for all years BC	lastpart = mw.ustring.gsub(lastpart, '^BC%s*', '') --handle BC separately; AD never used --TODO?: handle BCE, but only if it exists in the wild local dec0to40AD = (ndec >= 0 and ndec <= 40 and not parentBC) --special behavior in this range local switchADBC = 1                --  1=AD parent if parentBC then switchADBC = -1 end -- -1=BC parent; possibly adjusted later local BCdisp = '' local D = -math.huge --secondary switch & iterator for AD/BC transition --check non-default min/max more carefully; determine right-offset local roffset = 0 if mindec ~= mindefault then if tonumber(mindec) > ndec*switchADBC then mindec = tostring(ndec*switchADBC) --input error; mindec should be <= parent end end if maxdec ~= maxdefault then --a non-default max will override offsetting behavior if tonumber(maxdec) < ndec*switchADBC then maxdec = tostring(ndec*switchADBC) --input error; maxdec should be >= parent end else                           --offset only if 1) max == maxdefault, -- ** BHG commented out default offsets unless and until there is an expicit consensus for this     ** perverse behaviour, which disrupts navigation by making the poistion of the page's decade	 ** jump around erratically as we approcha and then pass the current decade		local thisyear = mw.getContentLanguage:formatDate( 'Y' )		local nthisdecade = tonumber(string.match(thisyear, '^%d%d%d')..'0')		if ndec <= nthisdecade then --and 2) we're not on a future-decade cat (e.g. Works set in the 2100s)			local diff = nthisdecade - ndec*switchADBC --in 2019: diff=30 for 1980, 0 for 2010, -20 for 2030			if diff < 0 then diff = 0 end  --always show at least 1 decade ahead for present-decade+ cats			if diff >= 0 and diff <= 30 then				roffset = 40 - diff --in 2019: roffset=10 for 1980, 40 for 2010, 40 for 2030			end		end    ** End section commented by BHG -- end local nmindec = tonumber(mindec) --similar behavior to nav_year & nav_nordinal local nmaxdec = tonumber(maxdec) --similar behavior to nav_nordinal --begin navdecade local bnb = '' --border/no border if navborder == false then --for embedding in {{Navseasoncats with decades below year}} bnb = ' border-style: none; background-color: transparent;' end local navd = '{| class="toccolours hlist" style="text-align: center; margin: auto;'..bnb..'"\n'..'|\n' local i = (-50 - roffset) while i <= (50 - roffset) do		local d = ndec + i*switchADBC if true then --left/right navd -- Hack by BHG to ensure that decade is linked. -- if i ~= 0 then --left/right navd local BC = '' BCdisp = '' if dec0to40AD then if D < -10 then d = math.abs(d + 10) --b/c 2 "0s" decades exist: "0s BC" & "0s" (AD) BC = 'BC ' if d == 0 then D = -10 --track 1st d = 0 use (BC) end elseif D >= -10 then D = D + 10 --now iterate from 0s AD					d = D     --2nd d = 0 use end elseif parentBC then if switchADBC == -1 then --parentBC looking at the BC side (the common case) BC = 'BC ' if d == 0 then    --prepare to switch to the AD side on the next iteration switchADBC = 1 --1st d = 0 use (BC) D = -10       --prep end elseif switchADBC == 1 then --switched to the AD side D = D + 10 --now iterate from 0s AD					d = D     --2nd d = 0 use (on first use) end end if BC ~= '' and ndec <= 50 then BCdisp = ' BC' --show BC for all BC decades whenever a "0s" is displayed on the nav end --determine target cat local disp = d..'s'..BCdisp local catlink = catlinkfollowr( firstpart..' '..d..'s'..tspace..BC..lastpart, disp ) if catlink[2] and avoidself then --a {{Category redirect}} was followed misctrackingcats[13] = ''..testcasecolon..'Category:Navseasoncats decade redirected' end --populate left/right navd local shown = '*'..catlink[1]..'\n' local hidden = ' '..disp..' ' local dsign = d --use d for display & dsign for logic if BC ~= '' then dsign = -dsign end if (nmindec <= dsign) and (dsign <= nmaxdec) then if dsign == 0 and (nmindec == 0 or nmaxdec == 0) then --distinguish b/w -0 (BC) & 0 (AD) --"zoom in" on +/- 0 and turn dsign/min/max temporarily into +/- 1 for easier processing local zsign, zmin, zmax = 1, nmindec, nmaxdec if BC ~= '' then zsign = -1 end if    mindec == '-0' then zmin = -1 elseif mindec == '0' then zmin =  1 end if    maxdec == '-0' then zmax = -1 elseif maxdec == '0' then zmax =  1 end if (zmin <= zsign) and (zsign <= zmax) then navd = navd..shown hidden = nil else navd = navd..'*'..hidden..'\n' end else navd = navd..shown --the common case hidden = nil end else navd = navd..'*'..hidden..'\n' end if listall and hidden then listofalllinks[#listofalllinks] = listofalllinks[#listofalllinks]..' ('..hidden..')' end else --center navd if D >= -10 then D = D + 10 --housekeeping b/w left/right sides end if parentBC then BCdisp = ' BC' if ndec == 0 then switchADBC = 1 --next element will be 0s AD					D = -10 --for this special case, D is still -inf end else BCdisp = '' end navd = navd..'*'..dec..'s'..BCdisp..'\n' end i = i + 10 end isolatedcat if listall then return listalllinks else return navd..'|}' end end

--============================{{ nav_year  }}==============================

function nav_year( firstpart, year, lastpart, minimumyear, maximumyear ) --Expects a PAGENAME of the form "Some sequential 1760 example cat", where --	firstpart  = Some sequential --	year       = 1760 --	lastpart   = example cat --	minimumyear = 1758 ('min' year parameter; optional) --	maximumyear = 1800 ('max' year parameter; optional) year = tonumber(year) or tonumber(mw.ustring.match(year or '', '^%s*(%d*)')) local minyear = tonumber(string.match(minimumyear or '', '-?%d+')) or -9999   --allow +/- qualifier local maxyear = tonumber(string.match(maximumyear or '', '-?%d+')) or 9999    --allow +/- qualifier if string.match(minimumyear or '', 'BC') then minyear = -math.abs(minyear) end --allow BC qualifier (AD otherwise assumed) if string.match(maximumyear or '', 'BC') then maxyear = -math.abs(maxyear) end --allow BC qualifier (AD otherwise assumed) if year == nil then errors = p.errorclass('Function nav_year can\'t recognize the year sent to its 2nd parameter.') return p.failedcat(errors, 'Y') end --AD/BC switches & vars local yearBCElastparts = { --needed for parent = AD 1-5, when the BC/E format is unknown --"BCE" removed to match both AD & BCE cats; easier & faster than multiple string.matchs ['example_Hebrew people_example'] = 'BCE', --example entry format; add to & adjust as needed }	local parentAD = string.match(firstpart, 'AD$') --following the "AD 1" convention from AD 1 to AD 10 local parentBC = string.match(lastpart, '^BCE?') --following the "1 BC" convention for all years BC	firstpart = mw.ustring.gsub(firstpart, '%s*AD$', '') --handle AD/BC separately for easier & faster accounting lastpart = mw.ustring.gsub(lastpart,  '^BCE?%s*', '') local BCe = parentBC or yearBCElastparts[lastpart] or 'BC' --"BC" default local year1to15AD = (year >= 1 and year <= 15 and not parentBC) --special behavior in this range local switchADBC = 1                --  1=AD parent if parentBC then switchADBC = -1 end -- -1=BC parent; possibly adjusted later local Y = 0 --secondary iterator for AD-on-a-BC-parent if minyear > year*switchADBC then minyear = year*switchADBC end --input error; minyear should be <= parent if maxyear < year*switchADBC then maxyear = year*switchADBC end --input error; maxyear should be >= parent local tspace = ' ' --trailing space after year, before lastpart if string.match(lastpart, '^-') then tspace = '' --e.g. "2018-related timelines" end --determine interyear gap size to condense special category types, if possible local ygapdefault = 1 --assume/start at the most common case: 2001, 2002, etc.	local ygap = ygapdefault if string.match(lastpart, 'presidential') then local ygap1, ygap2 = ygapdefault, ygapdefault --need to determine previous & next year gaps indepedently local ygap1_success, ygap2_success = false, false local prevseason = nil while ygap1 <= 5 do --Czech Republic, Poland, Sri Lanka, etc. have 5-year terms prevseason = firstpart..' '..(year-ygap1)..tspace..lastpart if mw.title.new(prevseason, 'Category').exists then ygap1_success = true break end ygap1 = ygap1 + 1 end local nextseason = nil while ygap2 <= 5 do --Czech Republic, Poland, Sri Lanka, etc. have 5-year terms nextseason = firstpart..' '..(year+ygap2)..tspace..lastpart if mw.title.new(nextseason, 'Category').exists then ygap2_success = true break end ygap2 = ygap2 + 1 end if ygap1_success and ygap2_success then if ygap1 == ygap2 then ygap = ygap1 end elseif ygap1_success then ygap = ygap1 elseif ygap2_success then ygap = ygap2 end end --skip non-existing years, if requested local ynogaps = {} --populate with existing years in the range, at most, [year-60, year+60] if skipgaps then if year > 70 then --add support for AD/BC (<= AD 10) if/when needed local yskipped = {} --track skipped y's to avoid double-checking local cat, found, Yeary --populate nav element queue outwards positively from the parent local Year = year --to save/ratchet progression local i = 1 while i <= 5 do				local y = 1 while y <= (15 - i) do --'15' in case we get to i=5 and find nothing 10 y out found = false Yeary = Year + y					if yskipped[Yeary] == nil then yskipped[Yeary] = Yeary cat = firstpart..' '..Yeary..tspace..lastpart found = mw.title.new( cat, 'Category' ).exists if found then break end end y = y + 1 end if found then Year = Yeary else         Year = Year + 1 end ynogaps[i] = Year i = i + 1 end ynogaps[0] = year --the parent --populate nav element queue outwards negatively from the parent Year = year --reset ratchet i = -1 while i >= -5 do				local y = -1 while y >= (-15 - i) do --'-15' in case we get to i=-5 and find nothing -10 y out found = false Yeary = Year + y					if yskipped[Yeary] == nil then yskipped[Yeary] = Yeary cat = firstpart..' '..Yeary..tspace..lastpart found = mw.title.new( cat, 'Category' ).exists if found then break end end y = y - 1 end if found then Year = Yeary else         Year = Year - 1 end ynogaps[i] = Year i = i - 1 end else skipgaps = false --AD/BC not supported end end --begin navyears local navy = '{| class="toccolours hlist" style="text-align: center; margin: auto;"\n'..'|\n' local y	local i = -5 while i <= 5 do		if skipgaps then y = ynogaps[i] else y = year + i*ygap*switchADBC end local BCdisp = '' if i ~= 0 then --left/right navy local AD = '' local BC = '' if year1to15AD then if year >= 11 then --parent = AD 11-15 if y <= 10 then --prepend AD on y = 1-10 cats only, per existing cats AD = 'AD ' end elseif year >= 1 then --parent = AD 1-10 if y <= 0 then BC = BCe..' ' y = math.abs(y - 1) --skip y = 0 (DNE) elseif y >= 1 and y <= 10 then --prepend AD on y = 1-10 cats only, per existing cats AD = 'AD ' end end elseif parentBC then if switchADBC == -1 then --displayed y is in the BC regime if y >= 1 then    --the common case BC = BCe..' ' elseif y == 0 then --switch from BC to AD regime switchADBC = 1 end end if switchADBC == 1 then --displayed y is now in the AD regime Y = Y + 1 --skip y = 0 (DNE) y = Y    --easiest solution: start another iterator for these AD y's displayed on a BC year parent AD = 'AD ' end end if BC ~= '' and year <= 5 then --only show 'BC' for parent years <= 5: saves room, easier to read, BCdisp = ' '..BCe         --and 6 is the first/last nav year that doesn't need a disambiguator; end                           --the center/parent year will always show BC, so no need to show it another 10x --populate left/right navy local ysign = y --use y for display & ysign for logic local disp = y..BCdisp if BC ~= '' then ysign = -ysign end local catlink = catlinkfollowr( firstpart..' '..AD..y..tspace..BC..lastpart, disp ) if (minyear <= ysign) and (ysign <= maxyear) then --ex: 1758, 1759, 1761, 1762, 1763, 1764, 1765 if catlink[2] and avoidself then --a {{Category redirect}} was followed misctrackingcats[14] = ''..testcasecolon..'Category:Navseasoncats year redirected' end navy = navy..'*'..catlink[1]..'\n' else --ex: 1755, 1756, 1757 local hidden = ' '..disp..' ' navy = navy..'*'..hidden..'\n' if listall then listofalllinks[#listofalllinks] = listofalllinks[#listofalllinks]..' ('..hidden..')' end end else --center navy; ex: 1760 if parentBC then BCdisp = ' '..BCe end navy = navy..'*'..year..BCdisp..'\n' end i = i + 1 end isolatedcat if listall then return listalllinks else return navy..'|}' end end

--==========================={{ nav_roman  }}==============================

function nav_roman( firstpart, roman, lastpart, minimumrom, maximumrom ) local toarabic = require('Module:ConvertNumeric').roman_to_numeral local toroman = require('Module:Roman').main --sterilize/convert rom/num local num = tonumber(toarabic(roman)) local rom = toroman({ [1] = num }) if num == nil or rom == nil then --out of range or some other error errors = p.errorclass('Function nav_roman can\'t recognize one or more of "'..(num or 'nil')..'" & "'..							(rom or 'nil')..'" in category "'..firstpart..' '..roman..' '..lastpart..'".') return p.failedcat(errors, 'R') end --sterilize min/max local minrom = tonumber(minimumrom or ) or tonumber(toarabic(minimumrom or )) local maxrom = tonumber(maximumrom or ) or tonumber(toarabic(maximumrom or )) if minrom < 1 then minrom = 1 end   --toarabic returns -1 on error if maxrom < 1 then maxrom = 9999 end --toarabic returns -1 on error if minrom > num then minrom = num end if maxrom < num then maxrom = num end --begin navroman local navr = '{| class="toccolours hlist" style="text-align: center; margin: auto;"\n'..'|\n' local i = -5 while i <= 5 do		local n = num + i		if n >= 1 then local r = toroman({ [1] = n }) if i ~= 0 then --left/right navr local catlink = catlinkfollowr( firstpart..' '..r..' '..lastpart, r ) if minrom <= n and n <= maxrom then if catlink[2] and avoidself then --a {{Category redirect}} was followed misctrackingcats[15] = ''..testcasecolon..'Category:Navseasoncats roman numeral redirected' end navr = navr..'*'..catlink[1]..'\n' else local hidden = ' '..r..' ' navr = navr..'*'..hidden..'\n' if listall then listofalllinks[#listofalllinks] = listofalllinks[#listofalllinks]..' ('..hidden..')' end end else --center navr navr = navr..'*'..r..'\n' end else navr = navr..'* '..'I'..' \n' end i = i + 1 end isolatedcat if listall then return listalllinks else return navr..'|}' end end

--=========================={{ nav_nordinal  }}============================

function nav_nordinal( firstpart, ord, lastpart, minimumord, maximumord ) local nord = tonumber(ord) local minord = tonumber(string.match(minimumord or '', '(-?%d+)[snrt]?[tdh]?')) or -9999 --allow full ord & +/- qualifier local maxord = tonumber(string.match(maximumord or '', '(-?%d+)[snrt]?[tdh]?')) or 9999 --allow full ord & +/- qualifier if string.match(minimumord or '', 'BC') then minord = -math.abs(minord) end --allow BC qualifier (AD otherwise assumed) if string.match(maximumord or '', 'BC') then maxord = -math.abs(maxord) end --allow BC qualifier (AD otherwise assumed) local temporal = string.match(lastpart, 'century') or					 string.match(lastpart, 'millennium') local tspace = ' ' --assume a trailing space after ordinal if string.match(lastpart, '^-') then tspace = '' end --DNE for "19th-century"-type cats --AD/BC switches & vars local ordBCElastparts = { --needed for parent = AD 1-5, when the BC/E format is unknown --lists the lastpart of valid BCE cats --"BCE" removed to match both AD & BCE cats; easier & faster than multiple string.matchs ['-century Hebrew people'] = 'BCE', --WP:CFD/Log/2016 June 21#Category:11th-century BC Hebrew people ['-century Jews']         = 'BCE', --co-nominated ['-century Judaism']      = 'BCE', --co-nominated ['-century rabbis']       = 'BCE', --co-nominated }	local parentBC = mw.ustring.match(lastpart, '%s(BCE?)')      --"1st-century BC" format local lastpartNoBC = mw.ustring.gsub(lastpart, '%sBCE?', '') --easier than splitting lastpart up in 2; AD never used local BCe = parentBC or ordBCElastparts[lastpartNoBC] or 'BC' --"BC" default local switchADBC = 1                --  1=AD parent if parentBC then switchADBC = -1 end -- -1=BC parent; possibly adjusted later local O = 0 --secondary iterator for AD-on-a-BC-parent if not temporal and minord < 1 then minord = 1 end --nothing before "1st parliament", etc.	if minord > nord*switchADBC then minord = nord*switchADBC end --input error; minord should be <= parent if maxord < nord*switchADBC then maxord = nord*switchADBC end --input error; maxord should be >= parent --determine right-offset, to not show unnecessary future millenia local roffset = 0 if temporal and nord <= 3 then if string.match(lastpartNoBC, 'millennium ') and --only offset "1st millennium BC in Egypt" to "3rd-millennium people"-type cats string.match(lastpartNoBC, 'millennium in fiction') == nil and --except these, which extend > 4th millennium maxord == 9999 --only apply if max unspecified then if not parentBC and nord <= 3 then --1st, 2nd, & 3rd millennium parents roffset = nord + 1 elseif parentBC and nord == 1 then --1st millennium BC only roffset = 1 end end end --begin navnordinal local bnb = '' --border/no border if navborder == false then --for embedding in 		bnb = ' border-style: none; background-color: transparent;' end local navo = '{| class="toccolours hlist" style="text-align: center; margin: auto;'..bnb..'"\n'..'|\n' local i = (-5 - roffset) while i <= (5 - roffset) do		local o = nord + i*switchADBC local BC = '' local BCdisp = '' if true then --left/right navo -- hack by BHG to ensure that century is linked -- if i ~= 0 then --left/right navo if parentBC then if switchADBC == -1 then --parentBC looking at the BC side if o >= 1 then    --the common case BC = ' '..BCe elseif o == 0 then --switch to the AD side BC = '' switchADBC = 1 end end if switchADBC == 1 then --displayed o is now in the AD regime O = O + 1 --skip o = 0 (DNE) o = O    --easiest solution: start another iterator for these AD o's displayed on a BC year parent end elseif o <= 0 then --parentAD looking at BC side BC = ' '..BCe o = math.abs(o - 1) --skip o = 0 (DNE) end if BC ~= '' and nord <= 5 then --only show 'BC' for parent ords <= 5: saves room, easier to read, BCdisp = ' '..BCe         --and 6 is the first/last nav ord that doesn't need a disambiguator; end                           --the center/parent ord will always show BC, so no need to show it another 10x --populate left/right navo local oth = p.addord(o) local osign = o --use o for display & osign for logic if BC ~= '' then osign = -osign end local hidden = ' '..oth..' ' if temporal then --e.g. "3rd-century BC" local lastpart = lastpartNoBC --lest we recursively add multiple "BC"s if BC ~= '' then lastpart = string.gsub(lastpart, temporal, temporal..BC) --replace BC if needed end local catlink = catlinkfollowr( firstpart..' '..oth..tspace..lastpart, oth..BCdisp ) if (minord <= osign) and (osign <= maxord) then if catlink[2] and avoidself then --a {{Category redirect}} was followed misctrackingcats[16] = ''..testcasecolon..'Category:Navseasoncats nordinal redirected' end navo = navo..'*'..catlink[1]..'\n' else navo = navo..'*'..hidden..'\n' if listall then listofalllinks[#listofalllinks] = listofalllinks[#listofalllinks]..' ('..hidden..')' end end elseif BC == '' and minord <= osign and osign <= maxord then --e.g. >= "1st parliament" local catlink = catlinkfollowr( firstpart..' '..oth..tspace..lastpart, oth ) if catlink[2] and avoidself then --a {{Category redirect}} was followed misctrackingcats[16] = ''..testcasecolon..'Category:Navseasoncats nordinal redirected' end navo = navo..'*'..catlink[1]..'\n' else --either out-of-range (hide), or non-temporal + BC = something might be wrong (2nd X parliament BC?); handle exceptions if/as they arise navo = navo..'*'..hidden..'\n' end else --center navo if parentBC then BC = ' '..BCe end navo = navo..'*'..p.addord(o)..BC..'\n' end i = i + 1 end isolatedcat if listall then return listalllinks else return navo..'|}' end end

--========================={{ nav_wordinal  }}=============================

function nav_wordinal( firstpart, word, lastpart, minimumword, maximumword, frame ) local eng2ord = require('Module:ConvertNumeric').english_to_ordinal local ord2eng = require('Module:ConvertNumeric').numeral_to_english local sc = string.match(word, '^%u') --sentence-case check local lc = string.lower(word) --operate on/with lc, and restore any sc later local nword = eng2ord(lc) local case = nil if sc then case = 'U' end --sterilize min/max local minword = 1 local maxword = 99 if minimumword then local num = tonumber(minimumword) if num and 0 < num and num < maxword then minword = num else local ord = eng2ord(minimumword) if 0 < ord and ord < maxword then minword = ord end end end if maximumword then local num = tonumber(maximumword) if num and 0 < num and num < maxword then maxword = num else local ord = eng2ord(maximumword) if 0 < ord and ord < maxword then maxword = ord end end end if minword > nword then minword = nword end if maxword < nword then maxword = nword end --begin navwordinal local navw = '{| class="toccolours hlist" style="text-align: center; margin: auto;"\n'..'|\n' local i = -5 while i <= 5 do		local n = nword + i		if n >= 1 then local nth = p.addord(n) if i ~= 0 then --left/right navw local frame_args = frame:newChild{ args = { n, ord = 'on', case = case } } --easier to do this than modify Module:ConvertNumeric local w = ord2eng( frame_args ) local catlink = catlinkfollowr( firstpart..' '..w..' '..lastpart, nth ) if minword <= n and n <= maxword then if catlink[2] and avoidself then --a {{Category redirect}} was followed misctrackingcats[17] = ''..testcasecolon..'Category:Navseasoncats wordinal redirected' end navw = navw..'*'..catlink[1]..'\n' else local hidden = ' '..nth..' ' navw = navw..'*'..hidden..'\n' if listall then listofalllinks[#listofalllinks] = listofalllinks[#listofalllinks]..' ('..hidden..')' end end else --center navw navw = navw..'*'..nth..'\n' end else navw = navw..'* '..'0th'..' \n' end i = i + 1 end isolatedcat if listall then return listalllinks else return navw..'|}' end end

--==========================={{ find_var  }}===============================

--Also used by {{Navseasoncats with centuries below decade}}. function p.find_var( pn ) --Extracts the variable text (e.g. 2015–16, 3rd, 2000s, III, etc.) from a string local pagename = currtitle.text if pn and pn ~= '' then pagename = pn	end local cpagename = 'Category:'..pagename --limited-Lua-regex workaround local d_season = mw.ustring.match(cpagename, ':(%d+s).+%(%d+[–-]%d+%)') --i.e. "1760s in the Province of Quebec (1763–1791)" local y_season = mw.ustring.match(cpagename, ':(%d+) .+%(%d+[–-]%d+%)') --i.e. "1763 establishments in the Province of Quebec (1763–1791)" local e_season = mw.ustring.match(cpagename, '%s(%d+[–-])$') --irreg; ending unknown, e.g. "Members of the Scottish Parliament 2021–" local season  = mw.ustring.match(cpagename, '[:%s%(](%d+[–-]%d+)[%)%s]') or --split in 2 b/c you can't frontier '$'/eos? mw.ustring.match(cpagename, '[:%s](%d+[–-]%d+)$') local tvseason = mw.ustring.match(cpagename, 'season (%d+)') or					 mw.ustring.match(cpagename, 'series (%d+)') local nordinal = mw.ustring.match(cpagename, '[:%s](%d+[snrt][tdh])[-%s]') or					 mw.ustring.match(cpagename, '[:%s](%d+[snrt][tdh])$') local decade  = mw.ustring.match(cpagename, '[:%s](%d+s)[%s-]') or					 mw.ustring.match(cpagename, '[:%s](%d+s)$') local year    = mw.ustring.match(cpagename, '[:%s](%d%d%d%d)%s') or --prioritize 4-digit years first mw.ustring.match(cpagename, '[:%s](%d%d%d%d)$') or					 mw.ustring.match(cpagename, '[:%s](%d+)%s') or					 mw.ustring.match(cpagename, '[:%s](%d+)$') or					 mw.ustring.match(cpagename, '[:%s](%d+)-related') --expand as needed local roman   = mw.ustring.match(cpagename, '%s([IVXLCDM]+)%s') local found   = d_season or y_season or e_season or season or tvseason or 					 nordinal or decade or year or roman if found then if string.match(found, '%d%d%d%d%d') == nil then --return in order of decreasing complexity/least chance for duplication if nordinal and season --i.e. "18th-century establishments in the Province of Quebec (1763–1791)" then return { 'nordinal', nordinal } end if d_season then return { 'decade',  d_season } end if y_season then return { 'year',    y_season } end if e_season then return { 'ending',  e_season } end if season  then return { 'season',   season   } end if tvseason then return { 'tvseason', tvseason } end if nordinal then return { 'nordinal', nordinal } end if decade  then return { 'decade',   decade   } end if year    then return { 'year',     year     } end if roman   then return { 'roman',    roman    } end end else --try word ('zeroth' to 'ninety-ninth' only) local eng2ord = require('Module:ConvertNumeric').english_to_ordinal local split = mw.text.split(pagename, ' ') for i=1, #split do			if eng2ord(split[i]) > -1 then return { 'wordinal', split[i] } end end end errors = p.errorclass('Function find_var can\'t find the variable text in category "'..pagename..'".') return { 'error', p.failedcat(errors, 'V') } end

--========================================================================== --                                 Main --==========================================================================

function p.navseasoncats( frame ) local args = frame:getParent.args local dby = args['decade-below-year']    --used by {{Navseasoncats with decades below year}} local cbd = args['century-below-decade'] --used by {{Navseasoncats with centuries below decade}} local cat = args['cat']                  --'testcase' alias for mainspace local list = args['list-all-links']      --utility to output all links & followed #Rs instead of a navbar local follow = args['follow-redirects']  --default 'yes' local testcase   = args['testcase'] local testcasegap = args['testcasegap'] local minimum = args['min'] local maximum = args['max'] local skip_gaps = args['skip-gaps'] if dby then navborder = false dby = string.gsub(dby, '&#32;', ' ') --unicodify forced whitespace end if cbd then navborder = false cbd = string.gsub(cbd, '&#32;', ' ') --unicodify forced whitespace end if follow and follow == 'no' then followRs = false end if list and list == 'yes' then listall = true end if skip_gaps and skip_gaps == 'yes' then skipgaps = true if avoidself then misctrackingcats[19] = ''..testcasecolon..'Category:Navseasoncats using skip-gaps parameter' end end if currtitle.nsText == 'Category' then if cat and cat ~= '' then misctrackingcats[1] = ''..testcasecolon..'Category:Navseasoncats using cat parameter' end if testcase and testcase ~= '' then misctrackingcats[2] = ''..testcasecolon..'Category:Navseasoncats using testcase parameter' end end local pagename = testcase or cat or dby or cbd or currtitle.text --find the variable parts of pagename local findvar = p.find_var(pagename) if findvar[1] == 'error' then return findvar[2]..table.concat(misctrackingcats) end --basic format error checking in find_var local start = string.match(findvar[2], '^%d+') --the rest is static local findvar_escaped = string.gsub( findvar[2], '%-', '%%%-') local firstpart, lastpart = string.match(pagename, '^(.-)'..findvar_escaped..'(.*)$') if findvar[1] == 'tvseason' then --double check for cases like '30 Rock (season 3) episodes' firstpart, lastpart = string.match(pagename, '^(.-season )'..findvar_escaped..'(.*)$') if firstpart == nil then firstpart, lastpart = string.match(pagename, '^(.-series )'..findvar_escaped..'(.*)$') end end firstpart = mw.text.trim(firstpart or '') lastpart = mw.text.trim(lastpart or '') --call the appropriate nav function if findvar[1] == 'season' then      --e.g. "1–4", "1999–2000", "2001–02", "2001–2002", "2005–2010", etc.		local hyphen, finish = mw.ustring.match(findvar[2], '%d([–-])(%d+)') --ascii 150 & 45 (ndash & keyboard hyphen); mw req'd		return nav_hyphen( start, hyphen, finish, firstpart, lastpart, minimum, maximum, testcasegap )..table.concat(misctrackingcats) elseif findvar[1] == 'ending' then  --e.g. "2021–" (irregular; ending unknown) local hyphen, finish = mw.ustring.match(findvar[2], '%d([–-])$'), 0 --ascii 150 & 45 (ndash & keyboard hyphen); mw req'd		return nav_hyphen( start, hyphen, finish, firstpart, lastpart, minimum, maximum, testcasegap )..table.concat(misctrackingcats) elseif findvar[1] == 'tvseason' then --e.g. "1", "15" but preceded with "season" or "series" return nav_tvseason( firstpart, start, lastpart, maximum )..table.concat(misctrackingcats) --"minimum" defaults to 1 elseif findvar[1] == 'decade' then  --e.g. "0s", "2010s" return nav_decade( firstpart, start, lastpart, minimum, maximum )..table.concat(misctrackingcats) elseif findvar[1] == 'year' then    --e.g. "500", "2001" return nav_year( firstpart, start, lastpart, minimum, maximum )..table.concat(misctrackingcats) elseif findvar[1] == 'roman' then   --e.g. "I", "XXVIII" return nav_roman( firstpart, findvar[2], lastpart, minimum, maximum )..table.concat(misctrackingcats) elseif findvar[1] == 'nordinal' then --e.g. "4th" return nav_nordinal( firstpart, start, lastpart, minimum, maximum )..table.concat(misctrackingcats) elseif findvar[1] == 'wordinal' then --e.g. "first", "ninety-ninth" return nav_wordinal( firstpart, findvar[2], lastpart, minimum, maximum, frame )..table.concat(misctrackingcats) else                                --malformed errors = p.errorclass('Failed to determine the appropriate nav function from malformed season "'..findvar[2]..'". ') return p.failedcat(errors, 'N')..table.concat(misctrackingcats) end end

return p