Module:Chessboard Explained

local p =

local cfg, nrows, ncols

local function innerboard(args, size, rev) pattern = cfg.pattern or '%w%w' local root = mw.html.create('div') root:addClass('chess-board notheme') :css('position', 'relative') :wikitext(cfg.image_board(size)) for trow = 1,nrows do local row = rev and trow or (1 + nrows - trow) for tcol = 1,ncols do local col = rev and (1 + ncols - tcol) or tcol local piece = args[ncols * (nrows - row) + col + 2] or if piece:match(pattern) then local img = cfg.image_square(piece:match(pattern), row, col, size) root:tag('div') :css('position', 'absolute') :css('z-index', '3') :css('top', tostring((trow - 1) * size) .. 'px') :css('left', tostring((tcol - 1) * size) .. 'px') :css('width', size .. 'px') :css('height', size .. 'px') :wikitext(img) end end end

return tostring(root)end

function chessboard(args, size, rev, letters, numbers, header, footer, align, clear) function letters_row(rev, num_lt, num_rt) local letters = cfg.letters local root = mw.html.create() if num_lt then root:tag('td') :css('vertical-align', 'inherit') :css('padding', '0') end for k = 1,ncols do root:tag('td') :css('padding', '0') :css('vertical-align', 'inherit') :css('text-align', 'center') :css('height', '18px') :css('width', size .. 'px') :wikitext(rev and letters[1+ncols-k] or letters[k]) end if num_rt then root:tag('td') :css('vertical-align', 'inherit') :css('padding', '0') end return tostring(root) end local letters_tp = letters:match('both') or letters:match('top') local letters_bt = letters:match('both') or letters:match('bottom') local numbers_lt = numbers:match('both') or numbers:match('left') local numbers_rt = numbers:match('both') or numbers:match('right') local width = ncols * size + 2 if (numbers_lt) then width = width + 18 end if (numbers_rt) then width = width + 18 end

local root = mw.html.create('div') :addClass('thumb') :addClass('noviewer') :addClass(align) if(header and header ~= ) then root:tag('div'):addClass('center'):css('line-height', '130%'):css('margin', '0 auto'):css('max-width', (width + ncols) .. 'px'):wikitext(header) end local div = root:tag('div') :addClass('thumbinner') :css('width', width .. 'px') local b = div:tag('table') :attr('cellpadding', '0') :attr('cellspacing', '0') :css('font-size', '88%') :css('border', '1px #c8ccd1 solid') :css('padding', '0') :css('margin', 'auto')

if (letters_tp) then b:tag('tr') :css('vertical-align', 'middle') :wikitext(letters_row(rev, numbers_lt, numbers_rt)) end local tablerow = b:tag('tr'):css('vertical-align','middle') if (numbers_lt) then tablerow:tag('td') :css('padding', '0') :css('vertical-align', 'inherit') :css('text-align', 'center') :css('width', '18px') :css('height', size .. 'px') :wikitext(rev and 1 or nrows) end local td = tablerow:tag('td') :attr('colspan', ncols) :attr('rowspan', nrows) :css('padding', '0') :css('vertical-align', 'inherit') :wikitext(innerboard(args, size, rev)) if (numbers_rt) then tablerow:tag('td') :css('padding', '0') :css('vertical-align', 'inherit') :css('text-align', 'center') :css('width', '18px') :css('height', size .. 'px') :wikitext(rev and 1 or nrows) end if (numbers_lt or numbers_rt) then for trow = 2, nrows do local idx = rev and trow or (1 + nrows - trow) tablerow = b:tag('tr') :css('vertical-align', 'middle') if (numbers_lt) then tablerow:tag('td') :css('padding', '0') :css('vertical-align', 'inherit') :css('text-align', 'center') :css('height', size .. 'px') :wikitext(idx) end if (numbers_rt) then tablerow:tag('td') :css('padding', '0') :css('vertical-align', 'inherit') :css('text-align', 'center') :css('height', size .. 'px') :wikitext(idx) end end end if (letters_bt) then b:tag('tr') :css('vertical-align', 'middle') :wikitext(letters_row(rev, numbers_lt, numbers_rt)) end

if (footer and footer ~= ) then div:tag('div') :addClass('thumbcaption') :wikitext(footer) end

return tostring(root)end

function convertFenToArgs(fen) -- converts FEN notation to 64 entry array of positions, offset by 2 local res = -- Loop over rows, which are delimited by / for srow in string.gmatch("/" .. fen, "/%w+") do -- Loop over all letters and numbers in the row for piece in srow:gmatch("%w") do if piece:match("%d") then -- if a digit for k=1,piece do table.insert(res,' ') end else -- not a digit local color = piece:match('%u') and 'l' or 'd' piece = piece:lower table.insert(res, piece .. color) end end end

return resend

function convertArgsToFen(args, offset) function nullOrWhitespace(s) return not s or s:match('^%s*(.-)%s*$')

end function piece(s) return nullOrWhitespace(s) and 1 or s:gsub('%s*(%a)(%a)%s*', function(a, b) return b

'l' and a:upper or a end) end local res = offset = offset or 0 for row = 1, 8 do for file = 1, 8 do res = res .. piece(args[8*(row - 1) + file + offset]) end if row < 8 then res = res .. '/' end end return mw.ustring.gsub(res, '1+', function(s) return #s end)end

function p.board(frame) local args = frame.args local pargs = frame:getParent.args local style = args.style or pargs.style or 'Chess' cfg = require('Module:Chessboard/' .. style) nrows, ncols = cfg.dims local size = args.size or pargs.size or '26' local reverse = (args.reverse or pargs.reverse or ):lower

"true" local letters = (args.letters or pargs.letters or 'both'):lower local numbers = (args.numbers or pargs.numbers or 'both'):lower local header = args[2] or pargs[2] or local footer = args[nrows*ncols + 3] or pargs[nrows*ncols + 3] or local align = (args[1] or pargs[1] or 'tright'):lower local clear = args.clear or pargs.clear or (align:match('tright') and 'right') or 'none' local fen = args.fen or pargs.fen local pgn = args.pgn or pargs.pgn

size = mw.ustring.match(size, '[%d]+') or '26' -- remove px from size if (pgn) then local pgnModule = require('Module:Pgn') metadata, moves = pgnModule.main(pgn) fen = moves[#moves] end if (fen) then align = args.align or pargs.align or 'tright' clear = args.clear or pargs.clear or (align:match('tright') and 'right') or 'none' header = args.header or pargs.header or footer = args.footer or pargs.footer or return chessboard(convertFenToArgs(fen), size, reverse, letters, numbers, header, footer, align, clear) end if args[3] then return chessboard(args, size, reverse, letters, numbers, header, footer, align, clear) else return chessboard(pargs, size, reverse, letters, numbers, header, footer, align, clear) endend

function p.fen2ascii(frame) -- local b = convertFenToArgs(frame.args.fen) local res = '|=\n' local offset = 2 for row = 1,8 do local n = (9 - row) res = res .. n .. ' |' .. table.concat(b, '|', 8*(row-1) + 1 + offset, 8*(row-1) + 8 + offset) .. '|=\n' end res = mw.ustring.gsub(res,'\| \|', '| |') res = mw.ustring.gsub(res,'\| \|', '| |') return res .. ' a b c d e f g h'end

function p.ascii2fen(frame) -- return convertArgsToFen(frame.args, frame.args.offset or 1)end

return p