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games/3D CHESS/js/libraries.js
hexahigh f738ccef4f e
2022-05-01 19:18:13 +02:00

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/*
* Photon
* http://photon.attasi.com
*
* Licensed under the MIT license.
* Copyright 2012 Tom Giannattasio
*/
var Photon={version:"0.0.3",degToRad:function(a){return a*Math.PI/180},radToDeg:function(a){return a*180/Math.PI},getRotationVector:function(b,a){var e=b.rotate(a.x,Line.create([0,0,0],[1,0,0]));var c=e.rotate(a.y,Line.create([0,0,0],[0,1,0]));var d=c.rotate(a.z,Line.create([0,0,0],[0,0,1]));return d},getTransformString:function(){if(Photon.transformString){return Photon.transformString}var c;var d=["transform","webkitTransform","MozTransform","msTransform","OTransform"];var b=document.createElement("div");for(var a=0;a<d.length;a++){if(b.style[d[a]]==""){c=d[a]}}Photon.transformString=c;return c},buildMatrix:function(b){var a=new FirminCSSMatrix(b);a.m11=a.m11*10000000000000000;a.m12=a.m12*10000000000000000;a.m13=a.m13*10000000000000000;a.m14=a.m14*10000000000000000;a.m21=a.m21*10000000000000000;a.m22=a.m22*10000000000000000;a.m23=a.m23*10000000000000000;a.m24=a.m24*10000000000000000;a.m31=a.m31*10000000000000000;a.m32=a.m32*10000000000000000;a.m33=a.m33*10000000000000000;a.m34=a.m34*10000000000000000;a.m41=a.m41*10000000000000000;a.m42=a.m42*10000000000000000;a.m43=a.m43*10000000000000000;a.m44=a.m44*10000000000000000;return a}};Photon.Light=function(c,b,a){this.moveTo(c||0,b||0,a||100);this.calculateVector()};Photon.Light.prototype={moveTo:function(a,c,b){this.x=a;this.y=c;this.z=b;this.calculateVector()},calculateVector:function(){this.magnitude=Math.sqrt((this.x*this.x)+(this.y*this.y)+(this.z*this.z));this.vector=$V([this.x/this.magnitude,this.y/this.magnitude,this.z/this.magnitude])}};Photon.Face=function(d,b,a,c){this.element=d;this.maxShade=b||0.5;this.maxTint=a||0;this.isBackfaced=c||false;this.shaderElement=new Photon.ShaderElement(this.element);this.element.insertBefore(this.shaderElement,this.element.firstChild);this.transformString=Photon.getTransformString();this.getRotations()};Photon.Face.prototype={getRotations:function(){var b=window.getComputedStyle(this.element)[this.transformString]||"matrix3d(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)";this.matrix=Photon.buildMatrix(b);var a=this.matrix.decompose();this.rotations={x:a.rotate.x,y:a.rotate.y,z:a.rotate.z};this.vector=Photon.getRotationVector($V([0,0,1]),this.rotations)},render:function(b,h,g){if(h){this.getRotations()}var e;if(g){e=Photon.getRotationVector(this.vector,g)}else{e=this.vector}this.angleFrom=Photon.radToDeg(b.vector.angleFrom(e));var f;var d=this.isBackfaced?this.angleFrom/180:this.angleFrom/90;if(this.isBackfaced&&d>0.5){d=1-d}var c=Math.abs(this.maxShade+this.maxTint);var a=c*d;this.rangedPercentage=a;if(a<=this.maxTint){f="rgba(255, 255, 255, "+Math.abs(this.maxTint-a)+")"}else{f="rgba(0, 0, 0, "+Math.abs(a-this.maxTint)+")"}this.shaderElement.style.background=f},setMaxShade:function(a){this.maxShade=a},setMaxTint:function(a){this.maxTint=a}};Photon.ShaderElement=function(a){var b=document.createElement("div");b.className="photon-shader";b.style.position="absolute";b.style.top="0";b.style.left="0";b.style.width=window.getComputedStyle(a).width;b.style.height=window.getComputedStyle(a).height;return b};Photon.FaceGroup=function(f,a,c,b,d){this.element=f;this.faces=[];this.transformString=Photon.getTransformString();var g=a;for(var e=0;e<g.length;e++){this.faces[e]=new Photon.Face(g[e],c,b,d)}};Photon.FaceGroup.prototype={getRotations:function(){var b=window.getComputedStyle(this.element)[this.transformString]||"matrix3d(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)";this.matrix=Photon.buildMatrix(b);var a=this.matrix.decompose();this.rotations={x:a.rotate.x,y:a.rotate.y,z:a.rotate.z};this.vector=Photon.getRotationVector($V([0,0,1]),this.rotations)},render:function(a,d,c){if(d){this.getRotations()}this.angleFrom=Photon.radToDeg(a.vector.angleFrom(this.vector));for(var b=0,e=this.faces.length;b<e;b++){this.faces[b].render(a,c,this.rotations)}},setMaxShade:function(b){for(var a=0;a<this.faces.length;a++){this.faces[a].setMaxShade(b)}},setMaxTint:function(b){for(var a=0;a<this.faces.length;a++){this.faces[a].setMaxTint(b)}}};var Sylvester={version:"0.1.3",precision:0.000001};function Vector(){}Vector.prototype={modulus:function(){return Math.sqrt(this.dot(this))},dup:function(){return Vector.create(this.elements)},each:function(c){var d=this.elements.length,a=d,b;do{b=a-d;c(this.elements[b],b+1)}while(--d)},angleFrom:function(d){var e=d.elements||d;var c=this.elements.length,f=c,g;if(c!=e.length){return null}var a=0,l=0,h=0;this.each(function(k,m){a+=k*e[m-1];l+=k*k;h+=e[m-1]*e[m-1]});l=Math.sqrt(l);h=Math.sqrt(h);if(l*h===0){return null}var b=a/(l*h);if(b<-1){b=-1}if(b>1){b=1}return Math.acos(b)},dot:function(b){var a=b.elements||b;var c,d=0,e=this.elements.length;if(e!=a.length){return null}do{d+=this.elements[e-1]*a[e-1]}while(--e);return d},rotate:function(c,e){var b,d,a,h,g;switch(this.elements.length){case 2:b=e.elements||e;if(b.length!=2){return null}d=Matrix.Rotation(c).elements;a=this.elements[0]-b[0];h=this.elements[1]-b[1];return Vector.create([b[0]+d[0][0]*a+d[0][1]*h,b[1]+d[1][0]*a+d[1][1]*h]);break;case 3:if(!e.direction){return null}var f=e.pointClosestTo(this).elements;d=Matrix.Rotation(c,e.direction).elements;a=this.elements[0]-f[0];h=this.elements[1]-f[1];g=this.elements[2]-f[2];return Vector.create([f[0]+d[0][0]*a+d[0][1]*h+d[0][2]*g,f[1]+d[1][0]*a+d[1][1]*h+d[1][2]*g,f[2]+d[2][0]*a+d[2][1]*h+d[2][2]*g]);break;default:return null}},setElements:function(a){this.elements=(a.elements||a).slice();return this}};Vector.create=function(b){var a=new Vector();return a.setElements(b)};var $V=Vector.create;function Line(){}Line.prototype={distanceFrom:function(e){if(e.normal){return e.distanceFrom(this)}if(e.direction){if(this.isParallelTo(e)){return this.distanceFrom(e.anchor)}var k=this.direction.cross(e.direction).toUnitVector().elements;var c=this.anchor.elements,b=e.anchor.elements;return Math.abs((c[0]-b[0])*k[0]+(c[1]-b[1])*k[1]+(c[2]-b[2])*k[2])}else{var f=e.elements||e;var c=this.anchor.elements,a=this.direction.elements;var n=f[0]-c[0],l=f[1]-c[1],g=(f[2]||0)-c[2];var m=Math.sqrt(n*n+l*l+g*g);if(m===0){return 0}var h=(n*a[0]+l*a[1]+g*a[2])/m;var d=1-h*h;return Math.abs(m*Math.sqrt(d<0?0:d))}},contains:function(a){var b=this.distanceFrom(a);return(b!==null&&b<=Sylvester.precision)},pointClosestTo:function(s){if(s.direction){if(this.intersects(s)){return this.intersectionWith(s)}if(this.isParallelTo(s)){return null}var u=this.direction.elements,t=s.direction.elements;var f=u[0],e=u[1],c=u[2],q=t[0],o=t[1],m=t[2];var r=(c*q-f*m),p=(f*o-e*q),n=(e*m-c*o);var l=Vector.create([r*m-p*o,p*q-n*m,n*o-r*q]);var h=Plane.create(s.anchor,l);return h.intersectionWith(this)}else{var h=s.elements||s;if(this.contains(h)){return Vector.create(h)}var v=this.anchor.elements,u=this.direction.elements;var f=u[0],e=u[1],c=u[2],d=v[0],b=v[1],a=v[2];var r=f*(h[1]-b)-e*(h[0]-d),p=e*((h[2]||0)-a)-c*(h[1]-b),n=c*(h[0]-d)-f*((h[2]||0)-a);var g=Vector.create([e*r-c*n,c*p-f*r,f*n-e*p]);var w=this.distanceFrom(h)/g.modulus();return Vector.create([h[0]+g.elements[0]*w,h[1]+g.elements[1]*w,(h[2]||0)+g.elements[2]*w])}},rotate:function(p,q){if(typeof(q.direction)=="undefined"){q=Line.create(q.to3D(),Vector.k)}var g=Matrix.Rotation(p,q.direction).elements;var b=q.pointClosestTo(this.anchor).elements;var d=this.anchor.elements,a=this.direction.elements;var l=b[0],k=b[1],h=b[2],f=d[0],e=d[1],c=d[2];var o=f-l,n=e-k,m=c-h;return Line.create([l+g[0][0]*o+g[0][1]*n+g[0][2]*m,k+g[1][0]*o+g[1][1]*n+g[1][2]*m,h+g[2][0]*o+g[2][1]*n+g[2][2]*m],[g[0][0]*a[0]+g[0][1]*a[1]+g[0][2]*a[2],g[1][0]*a[0]+g[1][1]*a[1]+g[1][2]*a[2],g[2][0]*a[0]+g[2][1]*a[1]+g[2][2]*a[2]])},setVectors:function(a,c){a=Vector.create(a);c=Vector.create(c);if(a.elements.length==2){a.elements.push(0)}if(c.elements.length==2){c.elements.push(0)}if(a.elements.length>3||c.elements.length>3){return null}var b=c.modulus();if(b===0){return null}this.anchor=a;this.direction=Vector.create([c.elements[0]/b,c.elements[1]/b,c.elements[2]/b]);return this}};Line.create=function(b,c){var a=new Line();return a.setVectors(b,c)};function Matrix(){}Matrix.prototype={setElements:function(h){var m,a=h.elements||h;if(typeof(a[0][0])!="undefined"){var d=a.length,f=d,b,c,l;this.elements=[];do{m=f-d;b=a[m].length;c=b;this.elements[m]=[];do{l=c-b;this.elements[m][l]=a[m][l]}while(--b)}while(--d);return this}var e=a.length,g=e;this.elements=[];do{m=g-e;this.elements.push([a[m]])}while(--e);return this}};Matrix.create=function(a){var b=new Matrix();return b.setElements(a)};Matrix.Rotation=function(b,k){if(!k){return Matrix.create([[Math.cos(b),-Math.sin(b)],[Math.sin(b),Math.cos(b)]])}var d=k.dup();if(d.elements.length!=3){return null}var h=d.modulus();var l=d.elements[0]/h,g=d.elements[1]/h,f=d.elements[2]/h;var n=Math.sin(b),e=Math.cos(b),m=1-e;return Matrix.create([[m*l*l+e,m*l*g-n*f,m*l*f+n*g],[m*l*g+n*f,m*g*g+e,m*g*f-n*l],[m*l*f-n*g,m*g*f+n*l,m*f*f+e]])};FirminCSSMatrix=function(a){this.m11=this.m22=this.m33=this.m44=1;this.m12=this.m13=this.m14=this.m21=this.m23=this.m24=this.m31=this.m32=this.m34=this.m41=this.m42=this.m43=0;if(typeof a=="string"){this.setMatrixValue(a)}};FirminCSSMatrix.displayName="FirminCSSMatrix";FirminCSSMatrix.degreesToRadians=function(a){return a*Math.PI/180};FirminCSSMatrix.prototype.isAffine=function(){return this.m13===0&&this.m14===0&&this.m23===0&&this.m24===0&&this.m31===0&&this.m32===0&&this.m33===1&&this.m34===0&&this.m43===0&&this.m44===1};FirminCSSMatrix.prototype.setMatrixValue=function(g){g=g.trim();var b=g.match(/^matrix(3d)?\(\s*(.+)\s*\)$/),f,h,a,e,d,c;if(!b){return}f=!!b[1];h=b[2].split(/\s*,\s*/);a=h.length;e=new Array(a);if((f&&a!==16)||!(f||a===6)){return}for(d=0;d<a;d++){c=h[d];if(c.match(/^-?\d+(\.\d+)?$/)){e[d]=parseFloat(c)}else{return}}for(d=0;d<a;d++){point=f?("m"+(Math.floor(d/4)+1))+(d%4+1):String.fromCharCode(d+97);this[point]=e[d]}};FirminCSSMatrix.prototype.toString=function(){var a=this,b,c;if(this.isAffine()){c="matrix(";b=["a","b","c","d","e","f"]}else{c="matrix3d(";b=["m11","m12","m13","m14","m21","m22","m23","m24","m31","m32","m33","m34","m41","m42","m43","m44"]}return c+b.map(function(d){return a[d].toFixed(6)}).join(", ")+")"};var CSSMatrixDecomposed=function(c){c===undefined?c={}:null;var b={perspective:null,translate:null,skew:null,scale:null,rotate:null};for(var a in b){this[a]=c[a]?c[a]:new Vector4()}this.tween=function(d,f,k){if(k===undefined){k=function(e){return e}}if(!d){d=new CSSMatrixDecomposed(new FirminCSSMatrix().decompose())}var l=new CSSMatrixDecomposed(),h=index=null,g="";f=k(f);for(index in b){for(h in {x:"x",y:"y",z:"z",w:"w"}){l[index][h]=(this[index][h]+(d[index][h]-this[index][h])*f).toFixed(5)}}g="matrix3d(1,0,0,0, 0,1,0,0, 0,0,1,0, "+l.perspective.x+", "+l.perspective.y+", "+l.perspective.z+", "+l.perspective.w+") translate3d("+l.translate.x+"px, "+l.translate.y+"px, "+l.translate.y+"px) rotateX("+l.rotate.x+"rad) rotateY("+l.rotate.y+"rad) rotateZ("+l.rotate.z+"rad) matrix3d(1,0,0,0, 0,1,0,0, 0,"+l.skew.z+",1,0, 0,0,0,1) matrix3d(1,0,0,0, 0,1,0,0, "+l.skew.y+",0,1,0, 0,0,0,1) matrix3d(1,0,0,0, "+l.skew.x+",1,0,0, 0,0,1,0, 0,0,0,1) scale3d("+l.scale.x+", "+l.scale.y+", "+l.scale.z+")";try{l=new FirminCSSMatrix(g);return l}catch(m){console.error("Invalid matrix string: "+g);return""}}};var Vector4=function(a,d,c,b){this.x=a?a:0;this.y=d?d:0;this.z=c?c:0;this.w=b?b:0;this.checkValues=function(){this.x=this.x?this.x:0;this.y=this.y?this.y:0;this.z=this.z?this.z:0;this.w=this.w?this.w:0};this.length=function(){this.checkValues();return Math.sqrt(this.x*this.x+this.y*this.y+this.z*this.z)};this.normalise=function(){var e=this.length(),f=new Vector4(this.x/e,this.y/e,this.z/e);return f};this.dot=function(e){return this.x*e.x+this.y*e.y+this.z*e.z+this.w*e.w};this.cross=function(e){return new Vector4(this.y*e.z-this.z*e.y,this.z*e.x-this.x*e.z,this.x*e.y-this.y*e.x)};this.combine=function(g,f,e){return new Vector4((f*this.x)+(e*g.x),(f*this.y)+(e*g.y),(f*this.z)+(e*g.z))}};FirminCSSMatrix.prototype.determinant=function(){return this.m14*this.m23*this.m32*this.m41-this.m13*this.m24*this.m32*this.m41-this.m14*this.m22*this.m33*this.m41+this.m12*this.m24*this.m33*this.m41+this.m13*this.m22*this.m34*this.m41-this.m12*this.m23*this.m34*this.m41-this.m14*this.m23*this.m31*this.m42+this.m13*this.m24*this.m31*this.m42+this.m14*this.m21*this.m33*this.m42-this.m11*this.m24*this.m33*this.m42-this.m13*this.m21*this.m34*this.m42+this.m11*this.m23*this.m34*this.m42+this.m14*this.m22*this.m31*this.m43-this.m12*this.m24*this.m31*this.m43-this.m14*this.m21*this.m32*this.m43+this.m11*this.m24*this.m32*this.m43+this.m12*this.m21*this.m34*this.m43-this.m11*this.m22*this.m34*this.m43-this.m13*this.m22*this.m31*this.m44+this.m12*this.m23*this.m31*this.m44+this.m13*this.m21*this.m32*this.m44-this.m11*this.m23*this.m32*this.m44-this.m12*this.m21*this.m33*this.m44+this.m11*this.m22*this.m33*this.m44};FirminCSSMatrix.prototype.decompose=function(){var a=new FirminCSSMatrix(this.toString()),b=rightHandSide=inversePerspectiveMatrix=transposedInversePerspectiveMatrix=perspective=translate=row=i=scale=skew=pdum3=rotate=null;if(a.m33==0){return new CSSMatrixDecomposed(new FirminCSSMatrix().decompose())}for(i=1;i<=4;i++){for(j=1;j<=4;j++){a["m"+i+j]/=a.m44}}b=a;for(i=1;i<=3;i++){b["m"+i+"4"]=0}b.m44=1;if(b.determinant()==0){return new CSSMatrixDecomposed(new FirminCSSMatrix().decompose())}if(a.m14!=0||a.m24!=0||a.m34!=0){rightHandSide=new Vector4(a.m14,a.m24,a.m34,a.m44);inversePerspectiveMatrix=b.inverse();transposedInversePerspectiveMatrix=inversePerspectiveMatrix.transpose();perspective=transposedInversePerspectiveMatrix.transformVector(rightHandSide);a.m14=a.m24=a.m34=0;a.m44=1}else{perspective=new Vector4(0,0,0,1)}translate=new Vector4(a.m41,a.m42,a.m43);a.m41=0;a.m42=0;a.m43=0;row=[new Vector4(),new Vector4(),new Vector4()];for(i=1;i<=3;i++){row[i-1].x=a["m"+i+"1"];row[i-1].y=a["m"+i+"2"];row[i-1].z=a["m"+i+"3"]}scale=new Vector4();skew=new Vector4();scale.x=row[0].length();row[0]=row[0].normalise();skew.x=row[0].dot(row[1]);row[1]=row[1].combine(row[0],1,-skew.x);scale.y=row[1].length();row[1]=row[1].normalise();skew.x/=scale.y;skew.y=row[0].dot(row[2]);row[2]=row[2].combine(row[0],1,-skew.y);skew.z=row[1].dot(row[2]);row[2]=row[2].combine(row[1],1,-skew.z);scale.z=row[2].length();row[2]=row[2].normalise();skew.y/=scale.z;skew.y/=scale.z;pdum3=row[1].cross(row[2]);if(row[0].dot(pdum3)<0){for(i=0;i<3;i++){scale.x*=-1;row[i].x*=-1;row[i].y*=-1;row[i].z*=-1}}rotate=new Vector4();rotate.y=Math.asin(-row[0].z);if(Math.cos(rotate.y)!=0){rotate.x=Math.atan2(row[1].z,row[2].z);rotate.z=Math.atan2(row[0].y,row[0].x)}else{rotate.x=Math.atan2(-row[2].x,row[1].y);rotate.z=0}return new CSSMatrixDecomposed({perspective:perspective,translate:translate,skew:skew,scale:scale,rotate:rotate})};
/*
* Copyright (c) 2011, Jeff Hlywa (jhlywa@gmail.com)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*----------------------------------------------------------------------------*/
var Chess = function(fen) {
var BLACK = 'b';
var WHITE = 'w';
var EMPTY = -1;
var PAWN = 'p';
var KNIGHT = 'n';
var BISHOP = 'b';
var ROOK = 'r';
var QUEEN = 'q';
var KING = 'k';
var SYMBOLS = 'pnbrqkPNBRQK';
var DEFAULT_POSITION = 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1';
var POSSIBLE_RESULTS = ['1-0', '0-1', '1/2-1/2', '*'];
var PAWN_OFFSETS = {
b: [16, 32, 17, 15],
w: [-16, -32, -17, -15]
};
var 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]
};
var 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
];
var 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
];
var SHIFTS = { p: 0, n: 1, b: 2, r: 3, q: 4, k: 5 };
var FLAGS = {
NORMAL: 'n',
CAPTURE: 'c',
BIG_PAWN: 'b',
EP_CAPTURE: 'e',
PROMOTION: 'p',
KSIDE_CASTLE: 'k',
QSIDE_CASTLE: 'q'
};
var BITS = {
NORMAL: 1,
CAPTURE: 2,
BIG_PAWN: 4,
EP_CAPTURE: 8,
PROMOTION: 16,
KSIDE_CASTLE: 32,
QSIDE_CASTLE: 64
};
var RANK_1 = 7;
var RANK_2 = 6;
var RANK_3 = 5;
var RANK_4 = 4;
var RANK_5 = 3;
var RANK_6 = 2;
var RANK_7 = 1;
var RANK_8 = 0;
var SQUARES = {
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 ROOKS = {
w: [{square: SQUARES.a1, flag: BITS.QSIDE_CASTLE},
{square: SQUARES.h1, flag: BITS.KSIDE_CASTLE}],
b: [{square: SQUARES.a8, flag: BITS.QSIDE_CASTLE},
{square: SQUARES.h8, flag: BITS.KSIDE_CASTLE}]
};
var board = new Array(128);
var kings = {w: EMPTY, b: EMPTY};
var turn = WHITE;
var castling = {w: 0, b: 0};
var ep_square = EMPTY;
var half_moves = 0;
var move_number = 1;
var history = [];
var header = {};
/* if the user passes in a fen string, load it, else default to
* starting position
*/
if (typeof fen == 'undefined') {
load(DEFAULT_POSITION);
} else {
load(fen);
}
function clear() {
board = new Array(128);
kings = {w: EMPTY, b: EMPTY};
turn = WHITE;
castling = {w: '', b: ''};
ep_square = EMPTY;
half_moves = 0;
move_number = 1;
history = [];
header = {};
update_setup(generate_fen());
}
function reset() {
load(DEFAULT_POSITION);
}
function load(fen) {
var tokens = fen.split(/\s+/);
var position = tokens[0];
var square = 0;
var valid = SYMBOLS + '12345678/';
if (!validate_fen(fen).valid) {
return false;
}
clear();
for (var i = 0; i < position.length; i++) {
var piece = position.charAt(i);
if (piece == '/') {
square += 8;
} else if (is_digit(piece)) {
square += parseInt(piece, 10);
} else {
var color = (piece < 'a') ? WHITE : BLACK;
put({type: piece.toLowerCase(), color: color}, algebraic(square));
square++;
}
}
turn = tokens[1];
if (tokens[2].indexOf('K') > -1) {
castling.w |= BITS.KSIDE_CASTLE;
}
if (tokens[2].indexOf('Q') > -1) {
castling.w |= BITS.QSIDE_CASTLE;
}
if (tokens[2].indexOf('k') > -1) {
castling.b |= BITS.KSIDE_CASTLE;
}
if (tokens[2].indexOf('q') > -1) {
castling.b |= BITS.QSIDE_CASTLE;
}
ep_square = (tokens[3] == '-') ? EMPTY : SQUARES[tokens[3]];
half_moves = parseInt(tokens[4], 10);
move_number = parseInt(tokens[5], 10);
update_setup(generate_fen());
return true;
}
function validate_fen(fen) {
var errors = {
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].',
};
/* 1st criterion: 6 space-seperated fields? */
var tokens = fen.split(/\s+/);
if (tokens.length != 6) {
return {valid: false, error_number: 1, error: errors[1]};
}
/* 2nd criterion: move number field is a integer value > 0? */
if (isNaN(tokens[5]) || (parseInt(tokens[5], 10) <= 0)) {
return {valid: false, error_number: 2, error: errors[2]};
}
/* 3rd criterion: half move counter is an integer >= 0? */
if (isNaN(tokens[4]) || (parseInt(tokens[4], 10) < 0)) {
return {valid: false, error_number: 3, error: errors[3]};
}
/* 4th criterion: 4th field is a valid e.p.-string? */
if (!/^(-|[abcdefgh][36])$/.test(tokens[3])) {
return {valid: false, error_number: 4, error: errors[4]};
}
/* 5th criterion: 3th field is a valid castle-string? */
if( !/^(KQ?k?q?|Qk?q?|kq?|q|-)$/.test(tokens[2])) {
return {valid: false, error_number: 5, error: errors[5]};
}
/* 6th criterion: 2nd field is "w" (white) or "b" (black)? */
if (!/^(w|b)$/.test(tokens[1])) {
return {valid: false, error_number: 6, error: errors[6]};
}
/* 7th criterion: 1st field contains 8 rows? */
var rows = tokens[0].split("/");
if (rows.length != 8) {
return {valid: false, error_number: 7, error: errors[7]};
}
/* 8th criterion: every row is valid? */
for (var i = 0; i < rows.length; i++) {
/* check for right sum of fields AND not two numbers in succession */
var sum_fields = 0;
var previous_was_number = false;
for (var k = 0; k < rows[i].length; k++) {
if (!isNaN(rows[i][k])) {
if (previous_was_number) {
return {valid: false, error_number: 8, error: errors[8]};
}
sum_fields += parseInt(rows[i][k]);
previous_was_number = true;
} else {
if (!/^[prnbqkPRNBQK]$/.test(rows[i][k])) {
return {valid: false, error_number: 9, error: errors[9]};
}
sum_fields += 1;
previous_was_number = false;
}
}
if (sum_fields != 8) {
return {valid: false, error_number: 10, error: errors[10]};
}
}
/* everything's okay! */
return {valid: true, error_number: 0, error: errors[0]};
}
function generate_fen() {
var empty = 0;
var fen = '';
for (var i = SQUARES.a8; i <= SQUARES.h1; i++) {
if (board[i] == null) {
empty++;
} else {
if (empty > 0) {
fen += empty;
empty = 0;
}
var color = board[i].color;
var piece = board[i].type;
fen += (color == WHITE) ?
piece.toUpperCase() : piece.toLowerCase();
}
if ((i + 1) & 0x88) {
if (empty > 0) {
fen += empty;
}
if (i != SQUARES.h1) {
fen += '/';
}
empty = 0;
i += 8;
}
}
var cflags = '';
if (castling[WHITE] & BITS.KSIDE_CASTLE) { cflags += 'K'; }
if (castling[WHITE] & BITS.QSIDE_CASTLE) { cflags += 'Q'; }
if (castling[BLACK] & BITS.KSIDE_CASTLE) { cflags += 'k'; }
if (castling[BLACK] & BITS.QSIDE_CASTLE) { cflags += 'q'; }
/* do we have an empty castling flag? */
cflags = cflags || '-';
var epflags = (ep_square == EMPTY) ? '-' : algebraic(ep_square);
return [fen, turn, cflags, epflags, half_moves, move_number].join(' ')
}
function set_header(args) {
for (var i = 0; i < args.length; i += 2) {
if (typeof args[i] == "string" &&
typeof args[i + 1] == "string") {
header[args[i]] = args[i + 1];
}
}
return header;
}
/* called when the initial board setup is changed with put() or remove().
* modifies the SetUp and FEN properties of the header object. if the FEN is
* equal to the default position, the SetUp and FEN are deleted
* the setup is only updated if history.length is zero, ie moves haven't been
* made.
*/
function update_setup(fen) {
if (history.length > 0) return;
if (fen != DEFAULT_POSITION) {
header["SetUp"] = fen;
header["FEN"] = '1';
} else {
delete header["SetUp"];
delete header["FEN"];
}
}
function get(square) {
var piece = board[SQUARES[square]];
return (piece) ? {type: piece.type, color: piece.color} : null;
}
function put(piece, square) {
/* check for valid piece object */
if (!('type' in piece && 'color' in piece)) {
return false;
}
/* check for piece */
if (SYMBOLS.indexOf(piece.type.toLowerCase()) == -1) {
return false;
}
/* check for valid square */
if (!(square in SQUARES)) {
return false;
}
var sq = SQUARES[square];
board[sq] = {type: piece.type, color: piece.color};
if (piece.type == KING) {
kings[piece.color] = sq;
}
update_setup(generate_fen());
return true;
}
function remove(square) {
var piece = get(square);
board[SQUARES[square]] = null;
if (piece && piece.type == KING) {
kings[piece.color] = EMPTY;
}
update_setup(generate_fen());
return piece;
}
function generate_moves(settings) {
function add_move(board, moves, from, to, flags) {
/* if pawn promotion */
if (board[from].type == PAWN &&
(rank(to) == RANK_8 || rank(to) == RANK_1)) {
var pieces = [QUEEN, ROOK, BISHOP, KNIGHT];
for (var i = 0, len = pieces.length; i < len; i++) {
var promotion = {
color: turn,
from: from,
to: to,
flags: flags | BITS.PROMOTION,
promotion: pieces[i],
piece: board[from].type
};
/* add the captured piece */
if (board[to]) {
promotion.captured = board[to].type;
}
moves.push(promotion);
}
} else {
var move = {
color: turn,
from: from,
to: to,
flags: flags,
piece: board[from].type
};
if (board[to]) {
move.captured = board[to].type;
}
moves.push(move);
}
}
var moves = [];
var us = turn;
var them = swap_color(us);
var second_rank = {b: RANK_7, w: RANK_2};
var squares_to_test={};
if(typeof settings !=="undefined" && typeof settings.target !=="undefined"){
squares_to_test[settings.target]=SQUARES[settings.target];
}else{
squares_to_test=SQUARES;
settings={};
settings.target="";
}
for (var j in squares_to_test) {
/* did we run off the end of the board */
var i=squares_to_test[j];
if (i & 0x88) { i += 7; continue; }
var piece = board[i];
if (piece == null || piece.color != us) {
continue;
}
if (piece.type == PAWN) {
/* single square, non-capturing */
var square = i + PAWN_OFFSETS[us][0];
if (board[square] == null) {
add_move(board, moves, i, square, BITS.NORMAL);
/* double square */
var square = i + PAWN_OFFSETS[us][1];
if (second_rank[us] == rank(i) && board[square] == null) {
add_move(board, moves, i, square, BITS.BIG_PAWN);
}
}
/* pawn captures */
for (j = 2; j < 4; j++) {
var square = i + PAWN_OFFSETS[us][j];
if (square & 0x88) continue;
if (board[square] != null &&
board[square].color == them) {
add_move(board, moves, i, square, BITS.CAPTURE);
} else if (square == ep_square) {
add_move(board, moves, i, ep_square, BITS.EP_CAPTURE);
}
}
} else {
for (var j = 0, len = PIECE_OFFSETS[piece.type].length; j < len; j++) {
var offset = PIECE_OFFSETS[piece.type][j];
var square = i;
while (true) {
square += offset;
if (square & 0x88) break;
if (board[square] == null) {
add_move(board, moves, i, square, BITS.NORMAL);
} else {
if (board[square].color == us) break;
add_move(board, moves, i, square, BITS.CAPTURE);
break;
}
/* break, if knight or king */
if (piece.type == 'n' || piece.type == 'k') break;
}
}
}
}
/* king-side castling */
if (((castling[us] & BITS.KSIDE_CASTLE)&&(settings.target===""))||(kings[us]===squares_to_test[settings.target])) {
var castling_from = kings[us];
var castling_to = castling_from + 2;
if (board[castling_from + 1] == null &&
board[castling_to] == null &&
!attacked(them, kings[us]) &&
!attacked(them, castling_from + 1) &&
!attacked(them, castling_to)) {
add_move(board, moves, kings[us] , castling_to,
BITS.KSIDE_CASTLE);
}
}
/* queen-side castling */
if (((castling[us] & BITS.QSIDE_CASTLE)&&(settings.target===""))||(kings[us]===squares_to_test[settings.target])) {
var castling_from = kings[us];
var castling_to = castling_from - 2;
if (board[castling_from - 1] == null &&
board[castling_from - 2] == null &&
board[castling_from - 3] == null &&
!attacked(them, kings[us]) &&
!attacked(them, castling_from - 1) &&
!attacked(them, castling_to)) {
add_move(board, moves, kings[us], castling_to,
BITS.QSIDE_CASTLE);
}
}
/* if no parameters passed in, assume legal w/ algebraic moves */
if (typeof settings == 'undefined') {
settings = {legal: true};
}
/* return all pseudo-legal moves (this includes moves that allow the king
* to be captured
*/
if (settings.legal != null && settings.legal == false) {
return moves;
}
/* filter out illegal moves */
var legal_moves = [];
for (var i = 0, len = moves.length; i < len; i++) {
make_move(moves[i]);
if (!king_attacked(us)) {
legal_moves.push(moves[i]);
}
undo_move();
}
return legal_moves;
}
/* convert a move from 0x88 coordinates to Standard Algebraic Notation
* (SAN)
*/
function move_to_san(move) {
var output = '';
if (move.flags & BITS.KSIDE_CASTLE) {
output = 'O-O';
} else if (move.flags & BITS.QSIDE_CASTLE) {
output = 'O-O-O';
} else {
var disambiguator = get_disambiguator(move);
if (move.piece != PAWN) {
output += move.piece.toUpperCase() + disambiguator;
}
if (move.flags & (BITS.CAPTURE | BITS.EP_CAPTURE)) {
if (move.piece == PAWN) {
output += algebraic(move.from)[0];
}
output += 'x';
}
output += algebraic(move.to);
if (move.flags & BITS.PROMOTION) {
output += '=' + move.promotion.toUpperCase();
}
}
make_move(move);
if (in_check()) {
if (in_checkmate()) {
output += '#';
} else {
output += '+';
}
}
undo_move();
return output;
}
function attacked(color, square) {
for (var i = SQUARES.a8; i <= SQUARES.h1; i++) {
/* did we run off the end of the board */
if (i & 0x88) { i += 7; continue; }
/* if empty square or wrong color */
if (board[i] == null || board[i].color != color) continue;
var piece = board[i];
var difference = i - square;
var index = difference + 119;
if (ATTACKS[index] & (1 << SHIFTS[piece.type])) {
if (piece.type == PAWN) {
if (difference > 0) {
if (piece.color == WHITE) return true;
} else {
if (piece.color == BLACK) return true;
}
continue;
}
/* if the piece is a knight or a king */
if (piece.type == 'n' || piece.type == 'k') return true;
var offset = RAYS[index];
var j = i + offset;
var blocked = false;
while (j != square) {
if (board[j] != null) { blocked = true; break; }
j += offset;
}
if (!blocked) return true;
}
}
return false;
}
function king_attacked(color) {
return attacked(swap_color(color), kings[color]);
}
function in_check() {
return king_attacked(turn);
}
function in_checkmate() {
return in_check() && generate_moves().length == 0
}
function in_stalemate() {
return !in_check() && generate_moves().length == 0
}
function insufficient_material() {
var pieces = {};
var num_pieces = 0;
for (var i = SQUARES.a8; i<= SQUARES.h1; i++) {
if (i & 0x88) { i += 7; continue; }
var piece = board[i];
if (piece) {
pieces[piece.type] = (piece.type in pieces) ?
pieces[piece.type] + 1 : 1;
num_pieces++;
}
}
/* k vs. k */
if (num_pieces == 2) { return true; }
/* k vs. kn .... or .... k vs. kb */
else if (num_pieces == 3 && (pieces[BISHOP] == 1 ||
pieces[KNIGHT] == 1)) { return true; }
/* TODO: kb vs. kb where both bishops are on the same color */
return false;
}
function in_threefold_repetition() {
/* TODO: while this function is fine for casual use, a better
* implementation would use a Zobrist key (instead of FEN). the
* Zobrist key would be maintained in the make_move/undo_move functions,
* avoiding the costly that we do below.
*/
var moves = [];
var positions = {};
var repetition = false;
while (true) {
var move = undo_move();
if (!move) break;
moves.push(move);
}
while (true) {
/* remove the last two fields in the FEN string, they're not needed
* when checking for draw by rep */
var fen = generate_fen().split(' ').slice(0,4).join(' ');
/* has the position occurred three or move times */
positions[fen] = (fen in positions) ? positions[fen] + 1 : 1;
if (positions[fen] >= 3) {
repetition = true;
}
if (!moves.length) {
break;
}
make_move(moves.pop());
}
return repetition;
}
function push(move) {
history.push({
move: move,
kings: {b: kings.b, w: kings.w},
turn: turn,
castling: {b: castling.b, w: castling.w},
ep_square: ep_square,
half_moves: half_moves,
move_number: move_number
});
}
function make_move(move) {
var us = turn;
var them = swap_color(us);
push(move);
board[move.to] = board[move.from];
board[move.from] = null;
/* if ep capture, remove the captured pawn */
if (move.flags & BITS.EP_CAPTURE) {
if (turn == BLACK) {
board[move.to - 16] = null;
} else {
board[move.to + 16] = null;
}
}
/* if pawn promotion, replace with new piece */
if (move.flags & BITS.PROMOTION) {
board[move.to] = {type: move.promotion, color: us};
}
/* if we moved the king */
if (board[move.to].type == KING) {
kings[board[move.to].color] = move.to;
/* if we castled, move the rook next to the king */
if (move.flags & BITS.KSIDE_CASTLE) {
var castling_to = move.to - 1;
var castling_from = move.to + 1;
board[castling_to] = board[castling_from];
board[castling_from] = null;
} else if (move.flags & BITS.QSIDE_CASTLE) {
var castling_to = move.to + 1;
var castling_from = move.to - 2;
board[castling_to] = board[castling_from];
board[castling_from] = null;
}
/* turn off castling */
castling[turn] = '';
}
/* turn off castling if we move a rook */
if (castling[turn] != '') {
for (var i = 0, len = ROOKS[turn].length; i < len; i++) {
if (move.from == ROOKS[turn][i].square) {
castling[turn] =
castling[turn] ^= ROOKS[turn][i].flag;
break;
}
}
}
/* turn off castling if we capture a rook */
if (castling[them] != '') {
for (var i = 0, len = ROOKS[them].length; i < len; i++) {
if (move.to == ROOKS[them][i].square) {
castling[them] =
castling[them] ^= ROOKS[them][i].flag;
break;
}
}
}
/* if big pawn move, update the en passant square */
if (move.flags & BITS.BIG_PAWN) {
if (turn == 'b') {
ep_square = move.to - 16;
} else {
ep_square = move.to + 16;
}
} else {
ep_square = EMPTY;
}
/* reset the 50 move counter if a pawn is moved or a piece is captured */
if (move.piece == PAWN) {
half_moves = 0;
} else if (move.flags & (BITS.CAPTURE | BITS.EP_CAPTURE)) {
half_moves = 0;
} else {
half_moves++;
}
if (turn == BLACK) {
move_number++;
}
turn = swap_color(turn);
}
function undo_move() {
var old = history.pop();
if (old == null) { return null; }
var move = old.move;
kings = old.kings;
turn = old.turn;
castling = old.castling;
ep_square = old.ep_square;
half_moves = old.half_moves;
move_number = old.move_number;
var us = turn;
var them = swap_color(turn);
board[move.from] = board[move.to];
board[move.from].type = move.piece // to undo any promotions
board[move.to] = null;
if (move.flags & BITS.CAPTURE) {
board[move.to] = {type: move.captured, color: them};
} else if (move.flags & BITS.EP_CAPTURE) {
var index;
if (us == BLACK) {
index = move.to - 16;
} else {
index = move.to + 16;
}
board[index] = {type: PAWN, color: them};
}
if (move.flags & (BITS.KSIDE_CASTLE | BITS.QSIDE_CASTLE)) {
var castling_to, castling_from;
if (move.flags & BITS.KSIDE_CASTLE) {
castling_to = move.to + 1;
castling_from = move.to - 1;
} else if (move.flags & BITS.QSIDE_CASTLE) {
castling_to = move.to - 2;
castling_from = move.to + 1;
}
board[castling_to] = board[castling_from];
board[castling_from] = null;
}
return move;
}
/* this function is used to uniquely identify ambiguous moves */
function get_disambiguator(move) {
var moves = generate_moves();
var from = move.from;
var to = move.to;
var piece = move.piece;
var ambiguities = 0;
var same_rank = 0;
var same_file = 0;
for (var i = 0, len = moves.length; i < len; i++) {
var ambig_from = moves[i].from;
var ambig_to = moves[i].to;
var ambig_piece = moves[i].piece;
/* if a move of the same piece type ends on the same to square, we'll
* need to add a disambiguator to the algebraic notation
*/
if (piece == ambig_piece && from != ambig_from && to == ambig_to) {
ambiguities++;
if (rank(from) == rank(ambig_from)) {
same_rank++;
}
if (file(from) == file(ambig_from)) {
same_file++;
}
}
}
if (ambiguities > 0) {
/* if there exists a similar moving piece on the same rank and file as
* the move in question, use the square as the disambiguator
*/
if (same_rank > 0 && same_file > 0) {
return algebraic(from);
}
/* if the moving piece rests on the same file, use the rank symbol as the
* disambiguator
*/
else if (same_file > 0) {
return algebraic(from).charAt(1);
}
/* else use the file symbol */
else {
return algebraic(from).charAt(0);
}
}
return '';
}
function ascii() {
var s = ' +------------------------+\n';
for (var i = SQUARES.a8; i <= SQUARES.h1; i++) {
/* display the rank */
if (file(i) == 0) {
s += ' ' + '87654321'[rank(i)] + ' |';
}
/* empty piece */
if (board[i] == null) {
s += ' . ';
} else {
var piece = board[i].type;
var color = board[i].color;
var symbol = (color == WHITE) ?
piece.toUpperCase() : piece.toLowerCase();
s += ' ' + symbol + ' ';
}
if ((i + 1) & 0x88) {
s += '|\n';
i += 8;
}
}
s += ' +------------------------+\n';
s += ' a b c d e f g h\n';
return s;
}
/*****************************************************************************
* UTILITY FUNCTIONS
****************************************************************************/
function rank(i) {
return i >> 4;
}
function file(i) {
return i & 15;
}
function algebraic(i){
var f = file(i), r = rank(i);
return 'abcdefgh'.substring(f,f+1) + '87654321'.substring(r,r+1);
}
function swap_color(c) {
return c == WHITE ? BLACK : WHITE;
}
function is_digit(c) {
return '0123456789'.indexOf(c) != -1
}
/* pretty = external move object */
function make_pretty(ugly_move) {
var move = clone(ugly_move);
move.san = move_to_san(move);
move.to = algebraic(move.to);
move.from = algebraic(move.from);
var flags = '';
for (var flag in BITS) {
if (BITS[flag] & move.flags) {
flags += FLAGS[flag];
}
}
move.flags = flags;
return move;
}
function clone(obj) {
var dupe = (obj instanceof Array) ? [] : {};
for (var property in obj) {
if (typeof property == 'object') {
dupe[property] = clone(obj[property]);
} else {
dupe[property] = obj[property];
}
}
return dupe;
}
function trim(str) {
return str.replace(/^\s+|\s+$/g, '');
}
/*****************************************************************************
* DEBUGGING UTILITIES
****************************************************************************/
function perft(depth) {
var moves = generate_moves({legal: false})
var nodes = 0;
var color = turn;
for (var i = 0, len = moves.length; i < len; i++) {
make_move(moves[i]);
if (!king_attacked(color)) {
if (depth - 1 > 0) {
var child_nodes = perft(depth - 1);
nodes += child_nodes;
} else {
nodes++;
}
}
undo_move();
}
return nodes;
}
return {
/***************************************************************************
* PUBLIC CONSTANTS (is there a better way to do this?)
**************************************************************************/
WHITE: WHITE,
BLACK: BLACK,
PAWN: PAWN,
KNIGHT: KNIGHT,
BISHOP: BISHOP,
ROOK: ROOK,
QUEEN: QUEEN,
KING: KING,
SQUARES: (function() {
/* from the ECMA-262 spec (section 12.6.4):
* "The mechanics of enumerating the properties ... is
* implementation dependent"
* so: for (var sq in SQUARES) { keys.push(sq); } might not be
* ordered correctly
*/
var keys = [];
for (var i = SQUARES.a8; i <= SQUARES.h1; i++) {
if (i & 0x88) { i += 7; continue; }
keys.push(algebraic(i));
}
return keys;
})(),
FLAGS: FLAGS,
/***************************************************************************
* PUBLIC API
**************************************************************************/
load: function(fen) {
return load(fen);
},
reset: function() {
return reset();
},
moves: function(options) {
/* The internal representation of a chess move is in 0x88 format, and
* not meant to be human-readable. The code below converts the 0x88
* square coordinates to algebraic coordinates. It also prunes an
* unnecessary move keys resulting from a verbose call.
*/
var ugly_moves;
if((typeof options === 'undefined')||(typeof options.target==="undefined")){
ugly_moves = generate_moves();
}else{
ugly_moves = generate_moves({target:options.target});
}
var moves = [];
for (var i = 0, len = ugly_moves.length; i < len; i++) {
/* does the user want a full move object (most likely not), or just
* SAN
*/
if (typeof options != 'undefined' && 'verbose' in options &&
options.verbose) {
moves.push(make_pretty(ugly_moves[i]));
} else {
moves.push(move_to_san(ugly_moves[i]));
}
}
return moves;
},
in_check: function() {
return in_check();
},
in_checkmate: function() {
return in_checkmate();
},
in_stalemate: function() {
return in_stalemate();
},
in_draw: function() {
return half_moves >= 100 ||
in_stalemate() ||
insufficient_material() ||
in_threefold_repetition();
},
insufficient_material: function() {
return insufficient_material();
},
in_threefold_repetition: function() {
return in_threefold_repetition();
},
game_over: function() {
return half_moves >= 100 ||
in_checkmate() ||
in_stalemate() ||
insufficient_material() ||
in_threefold_repetition();
},
validate_fen: function(fen) {
return validate_fen(fen);
},
fen: function() {
return generate_fen();
},
pgn: function(options) {
/* using the specification from http://www.chessclub.com/help/PGN-spec
* example for html usage: .pgn({ max_width: 72, newline_char: "<br />" })
*/
var newline = (typeof options == "object" &&
typeof options.newline_char == "string") ?
options.newline_char : "\n";
var max_width = (typeof options == "object" &&
typeof options.max_width == "number") ?
options.max_width : 0;
var result = [];
var header_exists = false;
/* add the PGN header headerrmation */
for (var i in header) {
/* TODO: order of enumerated properties in header object is not
* guaranteed, see ECMA-262 spec (section 12.6.4)
*/
result.push("[" + i + " \"" + header[i] + "\"]" + newline);
header_exists = true;
}
if (header_exists && history.length) {
result.push(newline);
}
/* pop all of history onto reversed_history */
var reversed_history = [];
while (history.length > 0) {
reversed_history.push(undo_move());
}
var moves = [];
var move_string = "";
var pgn_move_number = 1;
/* build the list of moves. a move_string looks like: "3. e3 e6" */
while (reversed_history.length > 0) {
var move = reversed_history.pop();
/* if the position started with black to move, start PGN with 1. ... */
if (pgn_move_number == 1 && move.color == 'b') {
move_string = '1. ...';
pgn_move_number++;
} else if (move.color == 'w') {
/* store the previous generated move_string if we have one */
if (move_string.length) {
moves.push(move_string);
}
move_string = pgn_move_number + '.';
pgn_move_number++;
}
move_string = move_string + " " + move_to_san(move);
make_move(move);
}
/* are there any other leftover moves? */
if (move_string.length) {
moves.push(move_string);
}
/* is there a result? */
if (typeof header.Result != 'undefined') {
moves.push(header.Result);
}
/* history should be back to what is was before we started generating PGN,
* so join together moves
*/
if (max_width == 0) {
return result.join("") + moves.join(" ");
}
/* wrap the PGN output at max_width */
var current_width = 0;
for (var i = 0; i < moves.length; i++) {
/* if the current move will push past max_width */
if (current_width + moves[i].length > max_width && i != 0) {
/* don't end the line with whitespace */
if (result[result.length - 1] == " ") {
result.pop();
}
result.push(newline);
current_width = 0;
} else if (i != 0) {
result.push(" ");
current_width++;
}
result.push(moves[i]);
current_width += moves[i].length;
}
return result.join("");
},
load_pgn: function(pgn, options) {
function mask(str) {
return str.replace(/\n/g, '\\n');
}
/* convert a move from Standard Algebraic Notation (SAN) to 0x88
* coordinates
*/
function move_from_san(move) {
var moves = generate_moves();
for (var i = 0, len = moves.length; i < len; i++) {
if (move == move_to_san(moves[i])) {
return moves[i];
}
}
return null;
}
function get_move_obj(move) {
return move_from_san(trim(move));
}
function has_keys(object) {
var has_keys = false;
for (var key in object) {
has_keys = true;
}
return has_keys;
}
function parse_pgn_header(header, options) {
var newline_char = (typeof options == 'object' &&
typeof options.newline_char == 'string') ?
options.newline_char : '\n';
var header_obj = {};
var headers = header.split(newline_char);
var key = '';
var value = '';
for (var i = 0; i < headers.length; i++) {
key = headers[i].replace(/^\[([A-Z][A-Za-z]*)\s.*\]$/, '$1');
value = headers[i].replace(/^\[[A-Za-z]+\s"(.*)"\]$/, '$1');
if (trim(key).length > 0) {
header_obj[key] = value;
}
}
return header_obj;
}
var newline_char = (typeof options == 'object' &&
typeof options.newline_char == 'string') ?
options.newline_char : '\n';
var regex = new RegExp('^(\\[(.|' + mask(newline_char) + ')*\\])' +
'(' + mask(newline_char) + ')*' +
'1\.(' + mask(newline_char) + '|.)*$', 'g');
/* get header part of the PGN file */
var header_string = pgn.replace(regex, '$1');
/* no info part given, begins with moves */
if (header_string[0] != '[') {
header_string = '';
}
reset();
/* parse PGN header */
var headers = parse_pgn_header(header_string, options);
for (var key in headers) {
set_header([key, headers[key]]);
}
/* delete header to get the moves */
var ms = pgn.replace(header_string, '').replace(new RegExp(mask(newline_char), 'g'), ' ');
/* delete comments */
ms = ms.replace(/(\{[^}]+\})+?/g, '');
/* delete move numbers */
ms = ms.replace(/\d+\./g, '');
/* trim and get array of moves */
var moves = trim(ms).split(new RegExp(/\s+/));
/* delete empty entries */
moves = moves.join(",").replace(/,,+/g, ',').split(",");
var move = '';
for (var half_move = 0; half_move < moves.length - 1; half_move++) {
move = get_move_obj(moves[half_move]);
/* move not possible! (don't clear the board to examine to show the
* latest valid position)
*/
if (move == null) {
return false;
} else {
make_move(move);
}
}
/* examine last move */
move = moves[moves.length - 1];
if (POSSIBLE_RESULTS.indexOf(move) > -1) {
if (has_keys(header) && typeof header.Result == 'undefined') {
set_header(['Result', move]);
}
}
else {
move = get_move_obj(move);
if (move == null) {
return false;
} else {
make_move(move);
}
}
return true;
},
header: function() {
return set_header(arguments);
},
ascii: function() {
return ascii();
},
turn: function() {
return turn;
},
move: function(move) {
/* The move function can be called with in the following parameters:
*
* .move('Nxb7') <- where 'move' is a case-sensitive SAN string
*
* .move({ from: 'h7', <- where the 'move' is a move object (additional
* to :'h8', fields are ignored)
* promotion: 'q',
* })
*/
var move_obj = null;
var moves = generate_moves();
if (typeof move == 'string') {
/* convert the move string to a move object */
for (var i = 0, len = moves.length; i < len; i++) {
if (move == move_to_san(moves[i])) {
move_obj = moves[i];
break;
}
}
} else if (typeof move == 'object') {
/* convert the pretty move object to an ugly move object */
for (var i = 0, len = moves.length; i < len; i++) {
if (move.from == algebraic(moves[i].from) &&
move.to == algebraic(moves[i].to) &&
(!('promotion' in moves[i]) ||
move.promotion == moves[i].promotion)) {
move_obj = moves[i];
break;
}
}
}
/* failed to find move */
if (!move_obj) {
return null;
}
/* need to make a copy of move because we can't generate SAN after the
* move is made
*/
var pretty_move = make_pretty(move_obj);
make_move(move_obj);
return pretty_move;
},
undo: function() {
var move = undo_move();
return (move) ? make_pretty(move) : null;
},
clear: function() {
return clear();
},
put: function(piece, square) {
return put(piece, square);
},
get: function(square) {
return get(square);
},
remove: function(square) {
return remove(square);
},
perft: function(depth) {
return perft(depth);
},
square_color: function(square) {
if (square in SQUARES) {
var sq_0x88 = SQUARES[square];
return ((rank(sq_0x88) + file(sq_0x88)) % 2 == 0) ? 'light' : 'dark';
}
return null;
},
history: function(options) {
var reversed_history = [];
var move_history = [];
var verbose = (typeof options != 'undefined' && 'verbose' in options &&
options.verbose);
while (history.length > 0) {
reversed_history.push(undo_move());
}
while (reversed_history.length > 0) {
var move = reversed_history.pop();
if (verbose) {
move_history.push(make_pretty(move));
} else {
move_history.push(move_to_san(move));
}
make_move(move);
}
return move_history;
}
}
}
/* export Chess object if using node or any other CommonJS compatible
* environment */
if (typeof exports != 'undefined') exports.Chess = Chess;
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