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Joker a Card Game Programming Language. Jeffrey Eng Jonathan Tse Howard Chu Timothy SooHoo. Motivation. Structure & rule-driven nature of card games Succinctly describe the rules of a card game Create a runtime card game engine Framework for creating standard games. Feature Overview.

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joker a card game programming language

Jokera Card Game Programming Language

Jeffrey Eng

Jonathan Tse

Howard Chu

Timothy SooHoo

motivation
Motivation
  • Structure & rule-driven nature of card games
  • Succinctly describe the rules of a card game
  • Create a runtime card game engine
  • Framework for creating standard games
feature overview
Feature Overview
  • Special Pack datatype and operators
  • Hierarchy declaration
  • Program structure
  • Java-like syntax
compiler architecture
Compiler Architecture

*.jkr

Lexer

Parser

Tree Walker

Java Backend Classes

DEALR

pack of cards
Pack of Cards
  • Deck of cards is embedded in the language
  • known as the "pack" type.
  • essentially a super data structure with many list-like operations
  • In general, this is a grouping of cards. Can be used for the deck, player's hands, discard piles, etc.
pack operators
Pack Operators
  • The value of these expressions is a reference to a new pack containing the removed cards or the newly combined cards.
  • theDeck >> 2 // pop (or, deal)
  • theDeck << myHand // push
  • theDeck += disCards // enqueue
  • theDeck -= 5 // back-pop (dequeue)
  • theDeck@ // shuffle
  • myHand[0] // indexed access
war example
War Example

game War {

init {

pack theDeck;

hierarchy : { 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) } by

{ spades(1).hearts.clubs.diamonds } into theDeck;

// shuffle the deck

theDeck@;

// give half the deck

pack player1Hand = (theDeck >> theDeck.size/2);

// give the other ones

pack player2Hand = (theDeck >> theDeck.size);

}

war example cont
War Example (cont)

main {

for(int turn=0; true; turn++) {

boolean isDone = false;

card oneCard, twoCard;

pack prize;

int winner;

while(isDone != true) {

// IF they turn out of cards, other player is winner

if( player1Hand.size < 1 ) {

winner = 2;

break;

}

else if ( player2Hand.size < 1 ) {

winner = 1;

break;

}

war example cont9
War Example (cont)

oneCard = (player1Hand >> 1)[0];

twoCard = (player2Hand >> 1)[0];

if(oneCard lt twoCard) {

player1Hand += oneCard;

player1Hand += twoCard;

player1Hand += prize;

isDone = true;

}

else if(oneCard gt twoCard) {

player2Hand += oneCard;

player2Hand += twoCard;

player2Hand += prize;

isDone = true;

}

war example cont10
War Example (cont)

else {

// IF they turn out of cards, other player is winner

if( player1Hand.size < 4 ) {

winner = 2;

break;

}

else if ( player2Hand.size < 4 ) {

winner = 1;

break;

}

// I declare war

prize += oneCard;

prize += twoCard;

prize += player1Hand >> 3;

prize += player2Hand >> 3;

}

}

}

print "The winner is ";

print winner;

}

}

blackjack example
Blackjack Example

game Blackjack {

init {

int numPlayers = 4;

pack DECK;

pack [ numPlayers ] playerHands;

}

main {

boolean flipMe = true;

for (int n = 1; n < = 2; n++) {

foreach playerHands as hand{

hand += (DECK >> 1);

hand<bottom>.private = flipMe;

}

flipMe = false;

blackjack example cont
Blackjack Example (cont)

foreach playerHands as hand {

while(true) {

int sum = 0;

foreach hand as card {

sum += card.value;

}

option (hand)

hit (sum <= 21) {…}

stand (sum <= 21) {…}

bust (sum > 21) {…}

}

}

lessons learned
Lessons Learned
  • Communication
  • Divide and conquer
  • Project schedule / milestones
  • Set realistic goals
  • Start early
  • Stay focused on the core objectives