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chess-rules

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chess-rules - npm Package Compare versions

Comparing version 0.10.2 to 0.11.0

src/chess/locator.js

4

dist/chess-rules.min.js

@@ -1,2 +0,2 @@

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d(a,k)&&d(a,l)&&c.push(l)}return c},j.Q=function(a,b){var c=[];return[new i(-1,0),new i(1,0),new i(0,-1),new i(0,1),new i(-1,-1),new i(-1,1),new i(1,-1),new i(1,1)].forEach(function(d){g(a,b,d,c)}),c},b.exports={computeAllMoves:h,pieceDestinationsEvaluator:j}},{"./coordinates":15}],18:[function(a,b,c){"use strict";function d(a,b,c){for(var d=null,e=0;64>e;e++){var f=a.board[e];if(null!=f&&f.type===b&&f.side===c){d=e;break}}return d}function e(a){var b=i.computeAllMoves(a),c=[],e=function(b,c,e){var f=h.applyMove(a,b),g=i.computeAllMoves(f),j=d(f,c,e),k=!1;return g.forEach(function(a){a.dst==j&&(k=!0)}),k};return b.forEach(function(b){var d=new j(b.src),f=new j(b.dst),g=f.sub(d),h=e(b,"K",a.turn);"K"==a.board[b.src].type&&2==g.x&&(h=h||e({src:b.src,dst:b.src+1},"K",a.turn)),"K"==a.board[b.src].type&&-2==g.x&&(h=h||e({src:b.src,dst:b.src-1},"K",a.turn)),h||c.push(b)}),c}function f(a){var b=!1,c=a.turn;a.turn="W"===c?"B":"W";for(var d=0;64>=d;d++){var e=a.board[d],f=new j(d);if(null!=e&&e.side===a.turn){var g=i.pieceDestinationsEvaluator[e.type](a,f);g.forEach(function(c){var d=a.board[c.offset];d&&"K"===d.type&&d.side!==a.turn&&(b=!0)})}}return a.turn=c,b}var g=a("./coordinates"),h=a("./updates"),i=a("./moves-pieces"),j=g.BoardCoordinates;b.exports={getAvailableMoves:e,isCurrentPlayerInCheck:f}},{"./coordinates":15,"./moves-pieces":17,"./updates":24}],19:[function(a,b,c){"use strict";function d(a){var b="";return b+=String.fromCharCode("a".charCodeAt(0)+a%8),b+=String.fromCharCode("1".charCodeAt(0)+Math.floor(a/8))}function e(a,b){var c=null,d=j[b];if(d)c=d[a.turn];else{var e=i.parsePgnMove(b);if(e){var f=g.getAvailableMoves(a);f.forEach(function(b){(null==e.srcCol||b.src%8==e.srcCol)&&(null==e.srcRow||Math.floor(b.src/8)==e.srcRow)&&b.dst==e.dst&&a.board[b.src].type==e.type&&(e.src=b.src)}),null!=e.src&&null!=e.dst&&(c={src:e.src,dst:e.dst})}}return c}function f(a,b){var c="",e=a.board[b.src];if("P"!=e.type&&(c+=e.type),"K"===e.type&&b.dst-b.src==2)return"O-O";if("K"===e.type&&b.dst-b.src==-2)return"O-O-O";var f=g.getAvailableMoves(a),i=[];f.forEach(function(c){c.dst==b.dst&&e.type==a.board[c.src].type&&i.push(c.src)});var j=d(b.src);if(i.length>1){var k=d(i[0]),l=d(i[1]);c+=k[0]==l[0]?j[1]:j[0]}null!=a.board[b.dst]&&(""==c&&"P"==e.type&&(c+=j[0]),c+="x"),c+=d(b.dst);var m=h.applyMove(a,b);return"P"==e.type&&(b.dst<8||b.dst>56)&&(c+="=Q"),g.isCurrentPlayerInCheck(m)&&(c+="+"),c}var g=a("./moves"),h=a("./updates"),i=a("./pgnParser"),j={"O-O":{W:{src:4,dst:6},B:{src:60,dst:62}},"O-O-O":{W:{src:4,dst:2},B:{src:60,dst:58}}};b.exports={pgnToMove:e,moveToPgn:f}},{"./moves":18,"./pgnParser":20,"./updates":24}],20:[function(a,b,c){"use strict";function d(a,b){var c=null,d=a.charCodeAt(b)-f,e=a.charCodeAt(b+1)-g;return d>=0&&8>d&&e>=0&&8>e&&(c+=d,c+=8*e),c}function e(a){var b={type:null,srcCol:null,srcRow:null,dst:null,promotion:null,capture:!1,checking:!1,mate:!1},c=0,e=a.length;-1!=["P","R","N","B","K","Q"].indexOf(a[c])?(b.type=a[c],c++):b.type="P";var h=a.indexOf("+"),i=a.indexOf("#"),j=a.indexOf("=");h>=0&&(b.checking=!0,e=h),i>=0&&(b.mate=!0,e=i),j>=0&&(b.promotion=a.substring(j+1,j+2),e=j);var k=d(a,e-2);if(null==k)return null;b.dst=k,e-=2,"x"===a[e-1]&&(e-=1,b.capture=!0);for(var l=c;e>l;l++){var m=a.charCodeAt(c),n=m-g,o=m-f;n>=0&&8>n&&(b.srcRow=n),o>=0&&8>o&&(b.srcCol=o)}return b}var f="a".charCodeAt(0),g="1".charCodeAt(0);b.exports={parsePgnMove:e}},{}],21:[function(a,b,c){"use strict";function d(a,b){return{type:a,side:b}}function e(a){return f[a.type.concat(a.side)]}var f={PW:"♙",PB:"♟",NW:"♘",NB:"♞",BW:"♗",BB:"♝",RW:"♖",RB:"♜",QW:"♕",QB:"♛",KW:"♔",KB:"♚"};b.exports={pieceFactory:d,pieceToUTF8:e}},{}],22:[function(a,b,c){"use strict";function d(a){return j.deepClone(a)}function e(){return{turn:"W",castlingFlags:{W:{K:!0,Q:!0},B:{K:!0,Q:!0}},lastPawnMoveColumn:null,check:!1,board:[h.pieceFactory("R","W"),h.pieceFactory("N","W"),h.pieceFactory("B","W"),h.pieceFactory("Q","W"),h.pieceFactory("K","W"),h.pieceFactory("B","W"),h.pieceFactory("N","W"),h.pieceFactory("R","W"),h.pieceFactory("P","W"),h.pieceFactory("P","W"),h.pieceFactory("P","W"),h.pieceFactory("P","W"),h.pieceFactory("P","W"),h.pieceFactory("P","W"),h.pieceFactory("P","W"),h.pieceFactory("P","W"),null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,h.pieceFactory("P","B"),h.pieceFactory("P","B"),h.pieceFactory("P","B"),h.pieceFactory("P","B"),h.pieceFactory("P","B"),h.pieceFactory("P","B"),h.pieceFactory("P","B"),h.pieceFactory("P","B"),h.pieceFactory("R","B"),h.pieceFactory("N","B"),h.pieceFactory("B","B"),h.pieceFactory("Q","B"),h.pieceFactory("K","B"),h.pieceFactory("B","B"),h.pieceFactory("N","B"),h.pieceFactory("R","B")]}}function f(a,b,c,d){var e;return e=(a+b)%2==0?"W"===c?d.WB:d.BB:"W"===c?d.WW:d.BW}function g(a,b){var c=[];c.push("W"==a.turn?"WHITE":"BLACK"),c.push(" "),c.push(a.castlingFlags.W.K?"K":""),c.push(a.castlingFlags.W.Q?"Q":""),c.push(a.castlingFlags.B.K?"k":""),c.push(a.castlingFlags.B.Q?"q":"");var d,e;for(d=7;d>=0;d--)for(c.push("\n"),c.push(d+1),c.push(" "),e=0;8>e;e++){var g=a.board[8*d+e];b?null==g?c.push(f(d,e,"W"," ")):c.push(f(d,e,g.side,h.pieceToUTF8(g)+" ")):null==g?c.push(". "):"W"==g.side?c.push(g.type.toUpperCase()+" "):c.push(g.type.toLowerCase()+" ")}return c.push("\n a b c d e f g h "),c.join("")}var h=a("./piece"),i=a("colors");i.setTheme({BW:["black","bgWhite"],BB:["black","bgMagenta"],WW:["white","bgWhite"],WB:["white","bgMagenta"]});var j=a("underscore-plus");b.exports={getInitialPosition:e,positionToString:g,clone:d}},{"./piece":21,colors:5,"underscore-plus":13}],23:[function(a,b,c){"use strict";function d(a){var b=e.getAvailableMoves(a),c="OPEN";return 0==b.length&&(c=a.check?"W"==a.turn?"BLACKWON":"WHITEWON":"PAT"),c}var e=a("./moves");b.exports={getGameStatus:d}},{"./moves":18}],24:[function(a,b,c){"use strict";function d(a,b){var c=[],d=new j(b.src),f=new j(b.dst),g=f.sub(d),h=a.board[b.dst];if(null!=h&&c.push({action:"remove",src:b.dst}),c.push({action:"move",src:b.src,dst:b.dst}),null==h&&"P"==a.board[b.src].type&&Math.abs(g.x)){var k=d.add(new j(g.x,0));c.push({action:"remove",src:k.offset})}"P"==a.board[b.src].type&&2==Math.abs(g.y)?c.push({action:"pawnColumn",col:b.src%8}):c.push({action:"pawnColumn",col:null}),"P"!=a.board[b.src].type||0!=f.y&&7!=f.y||c.push({action:"promote",src:b.dst}),"K"==a.board[b.src].type&&(c.push({action:"resetCastling",sides:["K","Q"]}),4==d.x&&6==f.x&&c.push({action:"move",src:f.add(new j(1,0)).offset,dst:f.add(new j(-1,0)).offset}),4==d.x&&2==f.x&&c.push({action:"move",src:f.add(new j(-2,0)).offset,dst:f.add(new j(1,0)).offset})),"R"==a.board[b.src].type&&0==d.x&&c.push({action:"resetCastling",sides:["Q"]}),"R"==a.board[b.src].type&&7==d.x&&c.push({action:"resetCastling",sides:["K"]});var l=e(a,c);l.turn=a.turn;var m=!1;return i.computeAllMoves(l).forEach(function(b){var c=a.board[b.dst];c&&"K"==c.type&&c.side!=a.turn&&(m=!0)}),c.push({action:"updateCheckFlag",value:m}),c}function e(a,b){var c=g.clone(a);return b.forEach(function(b){if("remove"===b.action){var d=b.src;c.board[d]=null}else"move"===b.action?(c.board[b.dst]=c.board[b.src],c.board[b.src]=null):"pawnColumn"===b.action?c.lastPawnMoveColumn=b.col:"resetCastling"===b.action?b.sides.forEach(function(b){c.castlingFlags[a.turn][b]=!1}):"updateCheckFlag"===b.action?c.check=b.value:"promote"===b.action&&(c.board[b.src].type="Q")}),c.turn="W"===a.turn?"B":"W",c}function f(a,b){var c=d(a,b);return e(a,c)}var g=a("./position"),h=a("./coordinates"),i=a("./moves-pieces"),j=h.BoardCoordinates;b.exports={computeDiffs:d,applyDiffs:e,applyMove:f}},{"./coordinates":15,"./moves-pieces":17,"./position":22}],25:[function(a,b,c){"use strict";var d=a("./chess/position"),e=a("./chess/moves"),f=a("./chess/updates"),g=a("./chess/pgn"),h=a("./chess/status"),i=a("./chess/locator"),j={getInitialPosition:d.getInitialPosition,positionToString:d.positionToString,getAvailableMoves:e.getAvailableMoves,applyMove:f.applyMove,computeDiffs:f.computeDiffs,applyDiffs:f.applyDiffs,pgnToMove:g.pgnToMove,moveToPgn:g.moveToPgn,getGameStatus:h.getGameStatus,findPiece:i.findPiece};b.exports=j},{"./chess/locator":16,"./chess/moves":18,"./chess/pgn":19,"./chess/position":22,"./chess/status":23,"./chess/updates":24}]},{},[25])(25)});

2

package.json
{
"name": "chess-rules",
"version": "0.10.2",
"version": "0.11.0",
"description": "Chess Rules implementation as a standalone module.",

@@ -5,0 +5,0 @@ "homepage": "https://github.com/chesscorp/chess-rules",

204

README.md

@@ -5,12 +5,14 @@ [![NPM version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Dependency Status][daviddm-image]][daviddm-url] [![Coverage Status](https://coveralls.io/repos/ChessCorp/chess-rules/badge.svg?branch=master&service=github)](https://coveralls.io/github/ChessCorp/chess-rules?branch=master)

# Install
## Install as node bundle
## As a Node module
```sh
$ npm install --save chess-rules
$ npm install chess-rules
```
This will install rules module in the node_modules folder and update your package.json.
This will install rules module in the node_modules folder.
## Install using bower
## Using Bower

@@ -31,11 +33,23 @@ ```sh

## Usage
# Usage
### Import the main rules object
## Import the main rules object
```js
var chessRules = require('chess-rules');
> var chessRules = require('chess-rules');
> chessRules
{ getInitialPosition: [Function: getInitialPosition],
positionToString: [Function: positionToString],
getAvailableMoves: [Function: getAvailableMoves],
applyMove: [Function: applyMove],
computeDiffs: [Function: computeDiffs],
applyDiffs: [Function: applyDiffs],
pgnToMove: [Function: pgnToMove],
moveToPgn: [Function: moveToPgn],
getGameStatus: [Function: getGameStatus]
}
```
### Instantiate an initial position model
## Instantiate an initial position model

@@ -46,3 +60,177 @@ ```js

The position model used by the internal engine has the following structure:
```js
{ turn: 'W',
castlingFlags: { W: { K: true, Q: true }, B: { K: true, Q: true } },
lastPawnMoveColumn: null,
check: false,
board:
[ { type: 'R', side: 'W' },
{ type: 'N', side: 'W' },
{ type: 'B', side: 'W' },
{ type: 'Q', side: 'W' },
{ type: 'K', side: 'W' },
{ type: 'B', side: 'W' },
{ type: 'N', side: 'W' },
{ type: 'R', side: 'W' },
{ type: 'P', side: 'W' },
{ type: 'P', side: 'W' },
{ type: 'P', side: 'W' },
{ type: 'P', side: 'W' },
{ type: 'P', side: 'W' },
{ type: 'P', side: 'W' },
{ type: 'P', side: 'W' },
{ type: 'P', side: 'W' },
null,
null,
null,
...
]
}
```
The position can be logged more conveniently using the provided function positionToString:
```js
> console.log(chessRules.positionToString(position))
WHITE KQkq
8 r n b q k b n r
7 p p p p p p p p
6 . . . . . . . .
5 . . . . . . . .
4 . . . . . . . .
3 . . . . . . . .
2 P P P P P P P P
1 R N B Q K B N R
a b c d e f g h
```
An extra parameter can be provided to use extended charsets but may not be supported by all terminals:
```js
> console.log(chessRules.positionToString(position, true))
WHITE KQkq
8 ♜ ♞ ♝ ♛ ♚ ♝ ♞ ♜
7 ♟ ♟ ♟ ♟ ♟ ♟ ♟ ♟
6
5
4
3
2 ♙ ♙ ♙ ♙ ♙ ♙ ♙ ♙
1 ♖ ♘ ♗ ♕ ♔ ♗ ♘ ♖
a b c d e f g h
```
## Get available moves for a given position
Moves are expressed as a pair of coordinates on the board. The offset value is computed row by row starting at A1.
```js
> var availableMoves = chessRules.getAvailableMoves(position);
undefined
> availableMoves
[ { src: 1, dst: 16 },
{ src: 1, dst: 18 },
{ src: 6, dst: 21 },
{ src: 6, dst: 23 },
{ src: 8, dst: 16 },
{ src: 8, dst: 24 },
{ src: 9, dst: 17 },
{ src: 9, dst: 25 },
{ src: 10, dst: 18 },
{ src: 10, dst: 26 },
{ src: 11, dst: 19 },
{ src: 11, dst: 27 },
{ src: 12, dst: 20 },
{ src: 12, dst: 28 },
{ src: 13, dst: 21 },
{ src: 13, dst: 29 },
{ src: 14, dst: 22 },
{ src: 14, dst: 30 },
{ src: 15, dst: 23 },
{ src: 15, dst: 31 } ]
>
```
## Converting a move from / to PGN movetext notation
PGN move text is described here [https://en.wikipedia.org/wiki/Portable_Game_Notation](https://en.wikipedia.org/wiki/Portable_Game_Notation)
Converting move text to move vector:
```js
> chessRules.pgnToMove(position, 'e4')
{ src: 12, dst: 28 }
> chessRules.pgnToMove(position, 'Pe2e4')
{ src: 12, dst: 28 }
> chessRules.pgnToMove(position, 'Nf3')
{ src: 6, dst: 21 }
```
Converting move vector to PGN move text:
```js
> chessRules.moveToPgn(position, { src: 6, dst: 23 });
'Nh3'
```
Note: the position must always be provided because the way that the moves are shortened requires access to the current piece positions to make these transforms.
## Update the position by playing moves
The **applyMove** will apply a move vector to create a new updated position structure. The original position object remains unchanged.
```js
> var moveE4 = chessRules.pgnToMove(position,'e4');
undefined
> var updatedPosition = chessRules.applyMove(position, moveE4);
undefined
> console.log(chessRules.positionToString(position))
WHITE KQkq
8 r n b q k b n r
7 p p p p p p p p
6 . . . . . . . .
5 . . . . . . . .
4 . . . . . . . .
3 . . . . . . . .
2 P P P P P P P P
1 R N B Q K B N R
a b c d e f g h
undefined
> console.log(chessRules.positionToString(updatedPosition))
BLACK KQkq
8 r n b q k b n r
7 p p p p p p p p
6 . . . . . . . .
5 . . . . . . . .
4 . . . . P . . .
3 . . . . . . . .
2 P P P P . P P P
1 R N B Q K B N R
a b c d e f g h
undefined
>
```
## Determine game status
A game status can be either:
* OPEN - The game is still in progress
* PAT - The game has ended as one of the players couldn't move anymore while not being checkmate
* WHITEWON - The white player won
* BLACKWON - The black player won
```js
> chessRules.getGameStatus(position)
'OPEN'
```
## License

@@ -49,0 +237,0 @@

4

src/index.js

@@ -8,2 +8,3 @@ 'use strict';

var status = require('./chess/status');
var locator = require('./chess/locator');

@@ -19,5 +20,6 @@ var chessRules = {

moveToPgn: pgn.moveToPgn,
getGameStatus: status.getGameStatus
getGameStatus: status.getGameStatus,
findPiece: locator.findPiece
};
module.exports = chessRules;
dist/chess-rules.js

Sorry, the diff of this file is too big to display

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