casino-server/lib/poker.js

An multi-rule scalable online poker game server powered by redis, node.js and socket.io

var POKER_COLORS = {
	4: '♠', 		// spade
	3: '♥', 	// heart
	2: '♣', 	// club
	1: '♦' 		// diamond
};

var POKER_NUMBERS = {
	14 : 'A',
	13 : 'K',
	12 : 'Q',
	11 : 'J',
	10 : '10',
	9 : '9',
	8 : '8',
	7 : '7',
	6 : '6',
	5 : '5',
	4 : '4',
	3 : '3',
	2 : '2',
	0 : '?'
};

var POKER_NUMBER_RANK = {
	'A': 14,
	'K': 13,
	'Q': 12,
	'J': 11,
	'10': 10,
	'9': 9,
	'8': 8,
	'7': 7,
	'6': 6,
	'5': 5,
	'4': 4,
	'3': 3,
	'2': 2,
	'?': 0,
	'': 0
};

var POKER_COLOR_RANK = {
	'S': 4,
	'H': 3,
	'C': 2,
	'D': 1,
	'': 0
};

var RED_JOKER = (6 << 4) | 15;
var BLACK_JOKER = (5 << 4) | 15;

var POKER_CARDS = {};
for(var color=1; color<=4; color++) {
	for(var number=2; number<=14; number++) {
		var card = (color << 4) | number;
		POKER_CARDS[ card ] = POKER_NUMBERS[ number ] + '' + POKER_COLORS[ color ];
	}
}
POKER_CARDS[ RED_JOKER ] = '@';
POKER_CARDS[ BLACK_JOKER ] = '*';
POKER_CARDS[ 0 ] = '?';

exports = module.exports = Poker;

function Poker(str){
	if(typeof str === 'string') {
		var c = POKER_COLOR_RANK[ str.charAt(0) ];
		var n = POKER_NUMBER_RANK[ str.substring(1) ];
		if(c && n) {
			return (c << 4) | n;
		} else {
			return 0;
		}
	} else if(typeof str === 'object') {
		var cards = [];
		for(var i=0; i<str.length; i++) {
			cards.push( Poker(str[i]) );
		}
		return cards;
	} else {
		return 0;
	}
}

Poker.RED_JOKER = RED_JOKER;
Poker.BLACK_JOKER = BLACK_JOKER;
	
Poker.SPADE = 4;
Poker.HEART = 3;
Poker.CLUB	= 2;
Poker.DIAMOND = 1;
	
Poker.COLORS = POKER_COLORS;
Poker.NUMBERS = POKER_NUMBERS;
Poker.CARDS = POKER_CARDS;
Poker.NUMBER_RANK = POKER_NUMBER_RANK;

Poker.visualize = function( cards ) {
	if(typeof cards === 'number') return POKER_CARDS[ cards ];
	
	var v_cards = [];
	for(var i=0, len=cards.length; i<len; i++) {
		v_cards.push( POKER_CARDS[ cards[i] ] );
	}
	return v_cards;
};

Poker.newSet = function( options ) {
	var no_joker = true, no_color = [], no_number = [], no_card = [];
	if(options) {
		if(typeof options.no_joker === 'boolean') no_joker = options.no_joker;
		if(typeof options.no_color === 'object') no_color = options.no_color;
		if(typeof options.no_number === 'object') no_number = options.no_number;
		if(typeof options.no_card === 'object') no_card = options.no_card;
	}
	
	var cards = [];
	for(var color=1; color<=4; color++) {
		if(no_color.indexOf(color) >= 0) continue;
		
		for(var number=2; number<=14; number++) {
			if(no_number.indexOf(number) >= 0) continue;
			
			var card = (color << 4) | number;
			if(no_card.indexOf(card) >= 0) continue;
			
			cards.push( card );
		}
	}
	
	if(! no_joker) {
		cards.push( RED_JOKER );
		cards.push( BLACK_JOKER );
	}
	
	return cards;
};

Poker.clone = function(cards) {
	var cloned = [];
	for(var i=0; i<cards.length; i++) {
		cloned[i] = cards[i];
	}
	return cloned;
};

Poker.draw = function(cards, n) {
	var len = cards.length;
	if(len < n) return [];
	
	var subset = [];
	while(n -- > 0) {
		var i = Math.floor( Math.random() * len );
		subset.push( cards[i] );
		cards.splice(i,1); // NOTICE: splice will return an array
		len --;
	}
	return subset;
};

Poker.randomize = function( cards ) {
	var randomized = this.draw(cards, cards.length);
	while(randomized.length > 0) {
		cards.push( randomized.shift() );
	}
	return cards;
};

Poker.compareColorNumber = function(a, b) {
	if(a == b) return 0;
	else {
		var aColor = a >> 4, aNumber = a & 0x0f;
		var bColor = b >> 4, bNumber = b & 0x0f;
		if(aColor == bColor) return aNumber - bNumber;
		else return aColor - bColor;
	}
};

Poker.compareNumberColor = function(a, b) {
	if(a == b) return 0;
	else {
		var aColor = a >> 4, aNumber = a & 0x0f;
		var bColor = b >> 4, bNumber = b & 0x0f;
		if(aNumber == bNumber) return aColor - bColor;
		else return aNumber - bNumber;
	}
};

Poker.compare = function(a, b) {
	return (a & 0xff) - (b & 0xff);
};

Poker.sort =
Poker.sortByColor = function( cards ) {
	return cards.sort( Poker.compareColorNumber ).reverse();
};

Poker.sortByNumber = function( cards ) {
	return cards.sort( Poker.compareNumberColor ).reverse();
};

Poker.merge = function( a, b ) {
	return a.concat(b);
};

Poker.print = function( cards ) {
	var str = cards.join(',');
	console.log( str );
};

Poker.view = function( cards ) {
	var str = Poker.visualize(cards).join(',');
	console.log( str );
};