Question

我正在尝试为文本冒险游戏编写命令行解析器。我将命令写入数组：Look，Talk，Get等......

如何编写在命令行开头查找这些命令的正则表达式，忽略单词“at，with，on等...”然后在命令行中选取其余单词作为一个字符串。例如，如果用户键入： “与孤独的树谈话”，我希望正则表达式找到“谈话”作为命令，忽略“与”，然后将“孤独的树”变成一个字符串。任何代码建议吗？

这就是我想出来的，当我把它放到HTML中时页面是空白的：

//Iterate through the array to see if a command was used
var myStringArray = ["Look","Talk","Take"];
var arrayLength = myStringArray.length;
for (var i = 0; i < arrayLength; i++) {
   //When it picks a particular word up it will save it.
   var str = "Talk with Lonely Tree";
  var textcmd = +str.split(' ')[0];

//replace the command word and unnecessary other words in the text
if (i == textcmd){

var objecttxt = str;
objecttxt = str.replace(textcmd, "")

var myUselessWords = ["on","with","at","to"];
var uselessLength = myUselessWords.length;
for (var t = 0; t < uselessLength; t++) {

var uselessCollection = [];
uselessCollection.push = t;

objecttxt = str.replace(t, "");

}
}
alert(objecttxt + " " + textcmd);
 }

Answer 1

对于你的例子，这样的事情应该有效：

 /(\blook|look|talk|get)\b.*\b(lonely\Wtree|something\Welse)\b/g

这会捕获您指定的任何“孤独树”对象的任何命令。如果您想使用RegExes，请尝试http://regexr.com/

在你的情况下，如果你有很多游戏命令和对象，我想你的正则表达式会变得非常大。如果首先检查命令，然后在第二步检查可能的对象，那么性能会更好。

Answer 2

我会尝试不同的方法：

var input = userinput; //however you get it
var commands = [/look/i, /take/i, /talk/i];
var gameObjects = []; //push objects here as they're created

var command = commands.filter(function(r) { return input.match(r); });
var object = gameObjects.filter(function(obj) {
    return input.match(new RegExp(obj.name, 'i');
});

if (command.length and object.length) {
    //do stuff, remember that String.prototype.match returns an array even
    //if there's only one match, so be sure to unbox
}

Javascript Regex为Text Adventure Game制作命令行解析器

2 个答案: