js设计模式----Behavioral Patterns之Interpreter（3）

最新推荐文章于 2025-07-13 20:10:19 发布

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本文介绍了一种使用JavaScript实现的战斗解析器设计模式。通过构造Battle类和Parser类，可以解析战斗场景并创建战斗实例。例如，罗伯特·拜拉席恩与雷加·坦格利安在三叉戟河的战斗被解析为一个具体的战斗对象。

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This pattern is different from those we’ve seen to this point as there is no real class
structure that is defined by the pattern. You can design your language interpreter
however you wish.
用下面这种机构来描述战斗：

(aggressor -> battle ground <- defender) -> victor

A battle between Robert Baratheon and RhaegarTargaryen at the river Trident would look like the following:

(Robert Baratheon -> River Trident <- RhaegarTargaryen) -> Robert Baratheon

The first thing we establish is a JavaScript data model for the battle like so:

class Battle {
    constructor(battleGround, agressor, defender, victor){
        this.battleGround = battleGround;
        this.agressor = agressor;
        this.defender = defender;
        this.victor = victor;
    }
}

Next we need a parser:

class Parser {
    constructor(battleText){
        this.battleText = battleText;
        this.currentIndex = 0;
        this.battleList = battleText.split("\n");
    }
    nextBattle() {
        if (!this.battleList[0])
            return null;
        var segments = this.battleList[0].match(/\((.+?)\s?->\s?(.+?)\s?<-\s?(.+?)->\s?(.+)/);
        return new Battle(segments[2],segments[1],segments[3],segments[4]);
    }
}

var text = "(Robert Baratheon -> River Trident <- RhaegarTargaryen) -> Robert Baratheon)";
var p = new Parser(text);
p.nextBattle();

As I mentioned earlier there is no fixed way to implement this pattern, so the implementation done in the preceding code is provided simply as an example. Your implementation will very likely look very different and that is just fine.
Interpreter can be a useful pattern in JavaScript. It is, however, a pretty infrequently
used pattern in most situations. The best example of a language interpreted in
JavaScript is the less language that is compiled, by JavaScript, to CSS.