David A. Windham
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chess.js

chess.js 17 KB
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  1. var Chess=function(ao){var p="b";var k="w";var E=-1;var X="p";var S="n";var s="b";var H="r";var j="q";var ad="k";var f="pnbrqkPNBRQK";var an="rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";var B=["1-0","0-1","1/2-1/2","*"];var u={b:[16,32,17,15],w:[-16,-32,-17,-15]};var J={n:[-18,-33,-31,-14,18,33,31,14],b:[-17,-15,17,15],r:[-16,1,16,-1],q:[-17,-16,-15,1,17,16,15,-1],k:[-17,-16,-15,1,17,16,15,-1]};var ac=[20,0,0,0,0,0,0,24,0,0,0,0,0,0,20,0,0,20,0,0,0,0,0,24,0,0,0,0,0,20,0,0,0,0,20,0,0,0,0,24,0,0,0,0,20,0,0,0,0,0,0,20,0,0,0,24,0,0,0,20,0,0,0,0,0,0,0,0,20,0,0,24,0,0,20,0,0,0,0,0,0,0,0,0,0,20,2,24,2,20,0,0,0,0,0,0,0,0,0,0,0,2,53,56,53,2,0,0,0,0,0,0,24,24,24,24,24,24,56,0,56,24,24,24,24,24,24,0,0,0,0,0,0,2,53,56,53,2,0,0,0,0,0,0,0,0,0,0,0,20,2,24,2,20,0,0,0,0,0,0,0,0,0,0,20,0,0,24,0,0,20,0,0,0,0,0,0,0,0,20,0,0,0,24,0,0,0,20,0,0,0,0,0,0,20,0,0,0,0,24,0,0,0,0,20,0,0,0,0,20,0,0,0,0,0,24,0,0,0,0,0,20,0,0,20,0,0,0,0,0,0,24,0,0,0,0,0,0,20];var o=[17,0,0,0,0,0,0,16,0,0,0,0,0,0,15,0,0,17,0,0,0,0,0,16,0,0,0,0,0,15,0,0,0,0,17,0,0,0,0,16,0,0,0,0,15,0,0,0,0,0,0,17,0,0,0,16,0,0,0,15,0,0,0,0,0,0,0,0,17,0,0,16,0,0,15,0,0,0,0,0,0,0,0,0,0,17,0,16,0,15,0,0,0,0,0,0,0,0,0,0,0,0,17,16,15,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,-1,-1,-1,-1,-1,-1,-1,0,0,0,0,0,0,0,-15,-16,-17,0,0,0,0,0,0,0,0,0,0,0,0,-15,0,-16,0,-17,0,0,0,0,0,0,0,0,0,0,-15,0,0,-16,0,0,-17,0,0,0,0,0,0,0,0,-15,0,0,0,-16,0,0,0,-17,0,0,0,0,0,0,-15,0,0,0,0,-16,0,0,0,0,-17,0,0,0,0,-15,0,0,0,0,0,-16,0,0,0,0,0,-17,0,0,-15,0,0,0,0,0,0,-16,0,0,0,0,0,0,-17];var av={p:0,n:1,b:2,r:3,q:4,k:5};var aj={NORMAL:"n",CAPTURE:"c",BIG_PAWN:"b",EP_CAPTURE:"e",PROMOTION:"p",KSIDE_CASTLE:"k",QSIDE_CASTLE:"q"};var D={NORMAL:1,CAPTURE:2,BIG_PAWN:4,EP_CAPTURE:8,PROMOTION:16,KSIDE_CASTLE:32,QSIDE_CASTLE:64};var W=7;var T=6;var Q=5;var P=4;var O=3;var N=2;var M=1;var K=0;var v={a8:0,b8:1,c8:2,d8:3,e8:4,f8:5,g8:6,h8:7,a7:16,b7:17,c7:18,d7:19,e7:20,f7:21,g7:22,h7:23,a6:32,b6:33,c6:34,d6:35,e6:36,f6:37,g6:38,h6:39,a5:48,b5:49,c5:50,d5:51,e5:52,f5:53,g5:54,h5:55,a4:64,b4:65,c4:66,d4:67,e4:68,f4:69,g4:70,h4:71,a3:80,b3:81,c3:82,d3:83,e3:84,f3:85,g3:86,h3:87,a2:96,b2:97,c2:98,d2:99,e2:100,f2:101,g2:102,h2:103,a1:112,b1:113,c1:114,d1:115,e1:116,f1:117,g1:118,h1:119};var V={w:[{square:v.a1,flag:D.QSIDE_CASTLE},{square:v.h1,flag:D.KSIDE_CASTLE}],b:[{square:v.a8,flag:D.QSIDE_CASTLE},{square:v.h8,flag:D.KSIDE_CASTLE}]};var C=new Array(128);var ak={w:E,b:E};var t=k;var d={w:0,b:0};var x=E;var n=0;var g=1;var Z=[];var ab={};if(typeof ao=="undefined"){h(an)}else{h(ao)}function ae(){C=new Array(128);ak={w:E,b:E};t=k;d={w:"",b:""};x=E;n=0;g=1;Z=[];ab={};q(z())}function Y(){h(an)}function h(ay){var aD=ay.split(/\s+/);var aw=aD[0];var aC=0;var aB=f+"12345678/";if(!aa(ay).valid){return false}ae();for(var az=0;az<aw.length;az++){var aA=aw.charAt(az);if(aA=="/"){aC+=8}else{if(r(aA)){aC+=parseInt(aA,10)}else{var ax=(aA<"a")?k:p;aq({type:aA.toLowerCase(),color:ax},m(aC));aC++}}}t=aD[1];if(aD[2].indexOf("K")>-1){d.w|=D.KSIDE_CASTLE}if(aD[2].indexOf("Q")>-1){d.w|=D.QSIDE_CASTLE}if(aD[2].indexOf("k")>-1){d.b|=D.KSIDE_CASTLE}if(aD[2].indexOf("q")>-1){d.b|=D.QSIDE_CASTLE}x=(aD[3]=="-")?E:v[aD[3]];n=parseInt(aD[4],10);g=parseInt(aD[5],10);q(z());return true}function aa(ay){var aD={0:"No errors.",1:"FEN string must contain six space-delimited fields.",2:"6th field (move number) must be a positive integer.",3:"5th field (half move counter) must be a non-negative integer.",4:"4th field (en-passant square) is invalid.",5:"3rd field (castling availability) is invalid.",6:"2nd field (side to move) is invalid.",7:"1st field (piece positions) does not contain 8 '/'-delimited rows.",8:"1st field (piece positions) is invalid [consecutive numbers].",9:"1st field (piece positions) is invalid [invalid piece].",10:"1st field (piece positions) is invalid [row too large].",};var aC=ay.split(/\s+/);if(aC.length!=6){return{valid:false,error_number:1,error:aD[1]}}if(isNaN(aC[5])||(parseInt(aC[5],10)<=0)){return{valid:false,error_number:2,error:aD[2]}}if(isNaN(aC[4])||(parseInt(aC[4],10)<0)){return{valid:false,error_number:3,error:aD[3]}}if(!/^(-|[abcdefgh][36])$/.test(aC[3])){return{valid:false,error_number:4,error:aD[4]}}if(!/^(KQ?k?q?|Qk?q?|kq?|q|-)$/.test(aC[2])){return{valid:false,error_number:5,error:aD[5]}}if(!/^(w|b)$/.test(aC[1])){return{valid:false,error_number:6,error:aD[6]}}var aB=aC[0].split("/");if(aB.length!=8){return{valid:false,error_number:7,error:aD[7]}}for(var az=0;az<aB.length;az++){var aw=0;var aA=false;for(var ax=0;ax<aB[az].length;ax++){if(!isNaN(aB[az][ax])){if(aA){return{valid:false,error_number:8,error:aD[8]}}aw+=parseInt(aB[az][ax]);aA=true}else{if(!/^[prnbqkPRNBQK]$/.test(aB[az][ax])){return{valid:false,error_number:9,error:aD[9]}}aw+=1;aA=false}}if(aw!=8){return{valid:false,error_number:10,error:aD[10]}}}return{valid:true,error_number:0,error:aD[0]}}function z(){var aC=0;var ay="";for(var aA=v.a8;aA<=v.h1;aA++){if(C[aA]==null){aC++}else{if(aC>0){ay+=aC;aC=0}var ax=C[aA].color;var aB=C[aA].type;ay+=(ax==k)?aB.toUpperCase():aB.toLowerCase()}if((aA+1)&136){if(aC>0){ay+=aC}if(aA!=v.h1){ay+="/"}aC=0;aA+=8}}var az="";if(d[k]&D.KSIDE_CASTLE){az+="K"}if(d[k]&D.QSIDE_CASTLE){az+="Q"}if(d[p]&D.KSIDE_CASTLE){az+="k"}if(d[p]&D.QSIDE_CASTLE){az+="q"}az=az||"-";var aw=(x==E)?"-":m(x);return[ay,t,az,aw,n,g].join(" ")}function at(aw){for(var ax=0;ax<aw.length;ax+=2){if(typeof aw[ax]=="string"&&typeof aw[ax+1]=="string"){ab[aw[ax]]=aw[ax+1]}}return ab}function q(aw){if(Z.length>0){return}if(aw!=an){ab.SetUp=aw;ab.FEN="1"}else{delete ab.SetUp;delete ab.FEN}}function ag(ax){var aw=C[v[ax]];return(aw)?{type:aw.type,color:aw.color}:null}function aq(aw,ay){if(!("type" in aw&&"color" in aw)){return false}if(f.indexOf(aw.type.toLowerCase())==-1){return false}if(!(ay in v)){return false}var ax=v[ay];C[ax]={type:aw.type,color:aw.color};if(aw.type==ad){ak[aw.color]=ax}q(z());return true}function F(ax){var aw=ag(ax);C[v[ax]]=null;if(aw&&aw.type==ad){ak[aw.color]=E}q(z());return aw}function am(ay,aB,aA,ax,az){var aw={color:t,from:aB,to:aA,flags:ax,piece:ay[aB].type};if(az){aw.flags|=D.PROMOTION;aw.promotion=az}if(ay[aA]){aw.captured=ay[aA].type}else{if(ax&D.EP_CAPTURE){aw.captured=X}}return aw}function b(ay){function aM(aS,aQ,aV,aU,aP){if(aS[aV].type==X&&(U(aU)==K||U(aU)==W)){var aT=[j,H,s,S];for(var aR=0,aO=aT.length;aR<aO;aR++){aQ.push(am(aS,aV,aU,aP,aT[aR]))}}else{aQ.push(am(aS,aV,aU,aP))}}var aN=[];var aA=t;var aJ=au(aA);var aK={b:M,w:T};var aE=v.a8;var aC=v.h1;var aB=(typeof ay!="undefined"&&"legal" in ay)?ay.legal:true;if(typeof ay!="undefined"&&"square" in ay){if(ay.square in v){aE=aC=v[ay.square]}else{return[]}}for(var aG=aE;aG<=aC;aG++){if(aG&136){aG+=7;continue}var ax=C[aG];if(ax==null||ax.color!=aA){continue}if(ax.type==X){var aD=aG+u[aA][0];if(C[aD]==null){aM(C,aN,aG,aD,D.NORMAL);var aD=aG+u[aA][1];if(aK[aA]==U(aG)&&C[aD]==null){aM(C,aN,aG,aD,D.BIG_PAWN)}}for(aF=2;aF<4;aF++){var aD=aG+u[aA][aF];if(aD&136){continue}if(C[aD]!=null&&C[aD].color==aJ){aM(C,aN,aG,aD,D.CAPTURE)}else{if(aD==x){aM(C,aN,aG,x,D.EP_CAPTURE)}}}}else{for(var aF=0,aH=J[ax.type].length;aF<aH;aF++){var az=J[ax.type][aF];var aD=aG;while(true){aD+=az;if(aD&136){break}if(C[aD]==null){aM(C,aN,aG,aD,D.NORMAL)}else{if(C[aD].color==aA){break}aM(C,aN,aG,aD,D.CAPTURE);break}if(ax.type=="n"||ax.type=="k"){break}}}}}if(d[aA]&D.KSIDE_CASTLE){var aL=ak[aA];var aI=aL+2;if(C[aL+1]==null&&C[aI]==null&&!af(aJ,ak[aA])&&!af(aJ,aL+1)&&!af(aJ,aI)){aM(C,aN,ak[aA],aI,D.KSIDE_CASTLE)}}if(d[aA]&D.QSIDE_CASTLE){var aL=ak[aA];var aI=aL-2;if(C[aL-1]==null&&C[aL-2]==null&&C[aL-3]==null&&!af(aJ,ak[aA])&&!af(aJ,aL-1)&&!af(aJ,aI)){aM(C,aN,ak[aA],aI,D.QSIDE_CASTLE)}}if(!aB){return aN}var aw=[];for(var aG=0,aH=aN.length;aG<aH;aG++){al(aN[aG]);if(!L(aA)){aw.push(aN[aG])}G()}return aw}function ar(ax){var ay="";if(ax.flags&D.KSIDE_CASTLE){ay="O-O"}else{if(ax.flags&D.QSIDE_CASTLE){ay="O-O-O"}else{var aw=c(ax);if(ax.piece!=X){ay+=ax.piece.toUpperCase()+aw}if(ax.flags&(D.CAPTURE|D.EP_CAPTURE)){if(ax.piece==X){ay+=m(ax.from)[0]}ay+="x"}ay+=m(ax.to);if(ax.flags&D.PROMOTION){ay+="="+ax.promotion.toUpperCase()}}}al(ax);if(R()){if(I()){ay+="#"}else{ay+="+"}}G();return ay}function af(ax,aD){for(var aA=v.a8;aA<=v.h1;aA++){if(aA&136){aA+=7;continue}if(C[aA]==null||C[aA].color!=ax){continue}var aE=C[aA];var aw=aA-aD;var aC=aw+119;if(ac[aC]&(1<<av[aE.type])){if(aE.type==X){if(aw>0){if(aE.color==k){return true}}else{if(aE.color==p){return true}}continue}if(aE.type=="n"||aE.type=="k"){return true}var ay=o[aC];var az=aA+ay;var aB=false;while(az!=aD){if(C[az]!=null){aB=true;break}az+=ay}if(!aB){return true}}}return false}function L(aw){return af(au(aw),ak[aw])}function R(){return L(t)}function I(){return R()&&b().length==0}function ah(){return !R()&&b().length==0}function A(){var aC={};var aB=[];var ax=0;var aD=0;for(var ay=v.a8;ay<=v.h1;ay++){aD=(aD+1)%2;if(ay&136){ay+=7;continue}var aA=C[ay];if(aA){aC[aA.type]=(aA.type in aC)?aC[aA.type]+1:1;if(aA.type==s){aB.push(aD)}ax++}}if(ax==2){return true}else{if(ax==3&&(aC[s]==1||aC[S]==1)){return true}else{if(ax==aC[s]+2){var az=0;var aw=aB.length;for(var ay=0;ay<aw;ay++){az+=aB[ay]}if(az==0||az==aw){return true}}}}return false}function i(){var ay=[];var ax={};var aA=false;while(true){var aw=G();if(!aw){break}ay.push(aw)}while(true){var az=z().split(" ").slice(0,4).join(" ");ax[az]=(az in ax)?ax[az]+1:1;if(ax[az]>=3){aA=true}if(!ay.length){break}al(ay.pop())}return aA}function e(aw){Z.push({move:aw,kings:{b:ak.b,w:ak.w},turn:t,castling:{b:d.b,w:d.w},ep_square:x,half_moves:n,move_number:g})}function al(ax){var aB=t;var aC=au(aB);e(ax);C[ax.to]=C[ax.from];C[ax.from]=null;if(ax.flags&D.EP_CAPTURE){if(t==p){C[ax.to-16]=null}else{C[ax.to+16]=null}}if(ax.flags&D.PROMOTION){C[ax.to]={type:ax.promotion,color:aB}}if(C[ax.to].type==ad){ak[C[ax.to].color]=ax.to;if(ax.flags&D.KSIDE_CASTLE){var az=ax.to-1;var aA=ax.to+1;C[az]=C[aA];C[aA]=null}else{if(ax.flags&D.QSIDE_CASTLE){var az=ax.to+1;var aA=ax.to-2;C[az]=C[aA];C[aA]=null}}d[t]=""}if(d[t]!=""){for(var ay=0,aw=V[t].length;ay<aw;ay++){if(ax.from==V[t][ay].square){d[t]=d[t]^=V[t][ay].flag;break}}}if(d[aC]!=""){for(var ay=0,aw=V[aC].length;ay<aw;ay++){if(ax.to==V[aC][ay].square){d[aC]=d[aC]^=V[aC][ay].flag;break}}}if(ax.flags&D.BIG_PAWN){if(t=="b"){x=ax.to-16}else{x=ax.to+16}}else{x=E}if(ax.piece==X){n=0}else{if(ax.flags&(D.CAPTURE|D.EP_CAPTURE)){n=0}else{n++}}if(t==p){g++}t=au(t)}function G(){var ax=Z.pop();if(ax==null){return null}var aw=ax.move;ak=ax.kings;t=ax.turn;d=ax.castling;x=ax.ep_square;n=ax.half_moves;g=ax.move_number;var aB=t;var aC=au(t);C[aw.from]=C[aw.to];C[aw.from].type=aw.piece;C[aw.to]=null;if(aw.flags&D.CAPTURE){C[aw.to]={type:aw.captured,color:aC}}else{if(aw.flags&D.EP_CAPTURE){var ay;if(aB==p){ay=aw.to-16}else{ay=aw.to+16}C[ay]={type:X,color:aC}}}if(aw.flags&(D.KSIDE_CASTLE|D.QSIDE_CASTLE)){var az,aA;if(aw.flags&D.KSIDE_CASTLE){az=aw.to+1;aA=aw.to-1}else{if(aw.flags&D.QSIDE_CASTLE){az=aw.to-2;aA=aw.to+1}}C[az]=C[aA];C[aA]=null}return aw}function c(ax){var aw=b();var aE=ax.from;var aF=ax.to;var aI=ax.piece;var aH=0;var aD=0;var aB=0;for(var az=0,aC=aw.length;az<aC;az++){var aA=aw[az].from;var ay=aw[az].to;var aG=aw[az].piece;if(aI==aG&&aE!=aA&&aF==ay){aH++;if(U(aE)==U(aA)){aD++}if(y(aE)==y(aA)){aB++}}}if(aH>0){if(aD>0&&aB>0){return m(aE)}else{if(aB>0){return m(aE).charAt(1)}else{return m(aE).charAt(0)}}}return""}function a(){var az="   +------------------------+\n";for(var ax=v.a8;ax<=v.h1;ax++){if(y(ax)==0){az+=" 87654321"[U(ax)]+" |"}if(C[ax]==null){az+=" . "}else{var ay=C[ax].type;var aw=C[ax].color;var aA=(aw==k)?ay.toUpperCase():ay.toLowerCase();az+=" "+aA+" "}if((ax+1)&136){az+="|\n";ax+=8}}az+="   +------------------------+\n";az+="     a  b  c  d  e  f  g  h\n";return az}function U(aw){return aw>>4}function y(aw){return aw&15}function m(aw){var ay=y(aw),ax=U(aw);return"abcdefgh".substring(ay,ay+1)+"87654321".substring(ax,ax+1)}function au(aw){return aw==k?p:k}function r(aw){return"0123456789".indexOf(aw)!=-1}function l(az){var ay=w(az);ay.san=ar(ay);ay.to=m(ay.to);ay.from=m(ay.from);var ax="";for(var aw in D){if(D[aw]&ay.flags){ax+=aj[aw]}}ay.flags=ax;return ay}function w(ay){var aw=(ay instanceof Array)?[]:{};for(var ax in ay){if(typeof ax=="object"){aw[ax]=w(ay[ax])}else{aw[ax]=ay[ax]}}return aw}function ap(aw){return aw.replace(/^\s+|\s+$/g,"")}function ai(aC){var ax=b({legal:false});var az=0;var ay=t;for(var aA=0,aw=ax.length;aA<aw;aA++){al(ax[aA]);if(!L(ay)){if(aC-1>0){var aB=ai(aC-1);az+=aB}else{az++}}G()}return 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