# Module:Chessboard

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')
: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('', 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', '')
:css('height', '')
: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( '' )
local numbers_rt = numbers:match( 'both' ) or numbers:match( '' )
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('')
:addClass('noviewer')
:addClass(align)
if( header and header ~= '' ) then
root:tag('div'):addClass(''):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('background', 'white')
:css('font-size', '88%')
:css('' , ' #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', '')
:css('width', '')
: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', '')
:css('width', '')
: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', '')
:css('height', size .. 'px')
:wikitext(idx)
end
if ( numbers_rt ) then
tablerow:tag('td')
:css('padding', '0')
:css('vertical-align', 'inherit')
:css('text-align', '')
: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 res
end  
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
local args = .args
local pargs = :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 * ) or *
local fen = args.fen or pargs.fen  
size = mw.ustring.match( size, '[%d]+' ) or '26' -- remove px from size
if (fen) then
align = args.align or pargs.align or 'tright'
clear = args.clear or pargs.clear or ( align:match('tright') and * ) or *
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)
end
end  
function p.fen2ascii
---
local b = convertFenToArgs( .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
---
return convertArgsToFen( .args, .args.offset or 1 )
end  
return p