本文系 Creating JVM language 翻譯的第 20 篇。
原文中的代碼和原文有不一致的地方均在新的代碼倉庫中更正過，建議參考新的代碼倉庫幌羞。

源碼

Github

撲克牌洗牌模擬器

在之前的 19 篇博客中属桦，我把實現(xiàn)編程語言的每一步都詳細的記錄下來了聂宾。如果不拿這門語言，練練手纪他，做個東西玩茶袒，那就沒什么意思了，對不向叉？

我準(zhǔn)備實現(xiàn)一個撲克牌的洗牌模擬器母谎。思路是提供一定數(shù)量的玩家供璧，指定每個玩家的撲克牌的數(shù)量。作為輸出隅居，每個玩家都能獲得一定數(shù)量的隨機撲克牌。

Card 類

Card {

    string color
    string pattern

    Card(string cardColor,string cardPattern) {
        color = cardColor
        pattern = cardPattern
    }

    string getColor() {
        color
    }

    string getPattern() {
        pattern
    }

    string toString() {
        return "{" + color + "," + pattern + "}"
    }
}

沒有黑科技万栅，就是一個對象扰她，并且是不可變的廉涕。

CardDrawer 類

CardDrawer {
    start {
        var cards = new List() //creates java.util.ArrayList 
        addNumberedCards(cards) //calling method with 3 arguments (last 2 are default)
        addCardWithAllColors("Ace",cards) 
        addCardWithAllColors("Queen",cards)
        addCardWithAllColors("King",cards)
        addCardWithAllColors("Jack",cards)
        //Calling with named arguments (and in differnet order)
        //The last parameter (cardsPerPlayer) is ommited (it's default value is 5)
        drawCardsForPlayers(playersAmount -> 5,cardsList -> cards) 
    }

    addNumberedCards(List cardsList,int first=2, int last=10) {
        for i from first to last {  //loop from first to last (inclusive)
            var numberString = new java.lang.Integer(i).toString()
            addCardWithAllColors(numberString,cardsList)
        }
    }

    addCardWithAllColors(string pattern,List cardsList) {
        cardsList.add(new Card("Clubs",pattern))
        cardsList.add(new Card("Diamonds",pattern))
        cardsList.add(new Card("Hearts",pattern))
        cardsList.add(new Card("Spades",pattern))
    }

    drawCardsForPlayers(List cardsList,int playersAmount = 3,int cardsPerPlayer = 5) {
        if(cardsList.size() < (playersAmount * cardsPerPlayer)) {
            print "ERROR - Not enough cards" //No exceptions yet :)
            return
        }
        var random = new java.util.Random()
        for i from 1 to playersAmount {
            var playernumberString = new java.lang.Integer(i).toString()
            print "player " + playernumberString  + " is drawing:"
            for j from 1 to cardsPerPlayer {
                var dawnCardIndex = random.nextInt(cardsList.size() - 1)
                var drawedCard = cardsList.remove(dawnCardIndex)
                print "    drawed:" + drawedCard
            }
        }
    }
} 

運行

首先我們需要編譯 Card 類廉白。然后編譯 CardDrawer 類。

java -classpath compiler/target/compiler-1.0-SNAPSHOT-jar-with-dependencies.jar: com.kubadziworski.compiler.Compiler EnkelExamples/RealApp/Card.enk
java -classpath compiler/target/compiler-1.0-SNAPSHOT-jar-with-dependencies.jar:. com.kubadziworski.compiler.Compiler EnkelExamples/RealApp/CardDrawer.enk

kuba@kuba-laptop:~/repos/Enkel-JVM-language$ java CardDrawer 
player 1 is drawing:
    drawed:{Diamonds,Queen}
    drawed:{Spades,7}
    drawed:{Hearts,Jack}
    drawed:{Spades,4}
    drawed:{Hearts,2}
player 2 is drawing:
    drawed:{Diamonds,4}
    drawed:{Hearts,Ace}
    drawed:{Diamonds,Jack}
    drawed:{Spades,Queen}
    drawed:{Spades,King}
player 3 is drawing:
    drawed:{Diamonds,Ace}
    drawed:{Clubs,2}
    drawed:{Clubs,3}
    drawed:{Spades,8}
    drawed:{Clubs,7}
player 4 is drawing:
    drawed:{Spades,Ace}
    drawed:{Diamonds,3}
    drawed:{Clubs,4}
    drawed:{Clubs,6}
    drawed:{Diamonds,2}
player 5 is drawing:
    drawed:{Hearts,4}
    drawed:{Hearts,Queen}
    drawed:{Hearts,10}
    drawed:{Clubs,Jack}
    drawed:{Diamonds,8}

完美聋溜！

再見，Enkel

為了實現(xiàn) Enkel 和分享整個過程我花費了大量的精力叭爱。寫代碼是一回事撮躁，能夠表達和分享是另一回事（能夠讓讀者通俗易懂本身就是一個很大的挑戰(zhàn)）。

在這個過程中我學(xué)習(xí)到了很多买雾，也希望屏幕前面的你也能有所收獲把曼。

很不幸的是，這是系列中的最后一篇了漓穿，這個項目將繼續(xù)下去祝迂，所以，保持關(guān)注吧器净！