2 lines
28 KiB
JavaScript
2 lines
28 KiB
JavaScript
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export const WHITE="w";export const BLACK="b";export const PAWN="p";export const KNIGHT="n";export const BISHOP="b";export const ROOK="r";export const QUEEN="q";export const KING="k";export const PIECE_SYMBOLS=["p","n","b","r","q","k"];export const DEFAULT_POSITION="rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";const EMPTY=-1;const FLAGS={NORMAL:"n",CAPTURE:"c",BIG_PAWN:"b",EP_CAPTURE:"e",PROMOTION:"p",KSIDE_CASTLE:"k",QSIDE_CASTLE:"q"};export const SQUARES=["a8","b8","c8","d8","e8","f8","g8","h8","a7","b7","c7","d7","e7","f7","g7","h7","a6","b6","c6","d6","e6","f6","g6","h6","a5","b5","c5","d5","e5","f5","g5","h5","a4","b4","c4","d4","e4","f4","g4","h4","a3","b3","c3","d3","e3","f3","g3","h3","a2","b2","c2","d2","e2","f2","g2","h2","a1","b1","c1","d1","e1","f1","g1","h1"];const BITS={NORMAL:1,CAPTURE:2,BIG_PAWN:4,EP_CAPTURE:8,PROMOTION:16,KSIDE_CASTLE:32,QSIDE_CASTLE:64};export const Ox88={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};const PAWN_OFFSETS={b:[16,32,17,15],w:[-16,-32,-17,-15]};const PIECE_OFFSETS={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]};const ATTACKS=[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];const RAYS=[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];const PIECE_MASKS={p:1,n:2,b:4,r:8,q:16,k:32};const SYMBOLS="pnbrqkPNBRQK";const PROMOTIONS=[KNIGHT,BISHOP,ROOK,QUEEN];const RANK_1=7;const RANK_2=6;const RANK_7=1;const RANK_8=0;const ROOKS={w:[{square:Ox88.a1,flag:BITS.QSIDE_CASTLE},{square:Ox88.h1,flag:BITS.KSIDE_CASTLE}],b:[{square:Ox88.a8,flag:BITS.QSIDE_CASTLE},{square:Ox88.h8,flag:BITS.KSIDE_CASTLE}]};const SECOND_RANK={b:RANK_7,w:RANK_2};const TERMINATION_MARKERS=["1-0","0-1","1/2-1/2","*"];export function rank(square){return square>>4}export function file(square){return square&15}function isDigit(c){return"0123456789".indexOf(c)!==-1}function algebraic(square){const f=file(square);const r=rank(square);return"abcdefgh".substring(f,f+1)+"87654321".substring(r,r+1)}function swapColor(color){return color===WHITE?BLACK:WHITE}export function validateFen(fen){const tokens=fen.split(/\s+/);if(tokens.length!==6){return{ok:false,error:"Invalid FEN: must contain six space-delimited fields"}}const moveNumber=parseInt(tokens[5],10);if(isNaN(moveNumber)||moveNumber<=0){return{ok:false,error:"Invalid FEN: move number must be a positive integer"}}const halfMoves=parseInt(tokens[4],10);if(isNaN(halfMoves)||halfMoves<0){return{ok:false,error:"Invalid FEN: half move counter number must be a non-negative integer"}}if(!/^(-|[abcdefgh][36])$/.test(tokens[3])){return{ok:false,error:"Invalid FEN: en-passant square is invalid"}}if(/[^kKqQ-]/.test(tokens[2])){return{ok:false,error:"Invalid FEN: castling availability
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