javascript版 trim と path 処理関連

Date: 2006-08-17 (Thu)
Category: javascript

よく使う trim は String を prototype で拡張しました。ので、同名で違うことをしている人は、注意。path 関連は php に強く影響を受けています。というかもっときれいに書き直したいので、obsolete になる可能性大ですが、とりあえず挙げておきます。

使い方としては、

p = Path("http://umbra.nascom.nasa.gov/eit/images/eclipse/williams/Williams_College_wl.jpg")

alert(p["domain"])    // umbra.nascom.nasa.gov と表示される。
alert(p["dirname"])   // /eit/images/eclipse/williams と表示される。
alert(p["basename"])  // Williams_College_wl.jpg と表示される。
alert(p["extension"]) // jpg と表示される。

こんな感じ。Path() の戻り値は Object ではなくて Array です。Associated Array というか Hash なので、prototype.js でほにゃほにゃしたい時は例えば、

p = $H(Path("http://umbra.nascom.nasa.gov/eit/images/eclipse/williams/Williams_College_wl.jpg"));
p.each(function(el){
   alert(el)
});

とかすると

domain, umbra.nascom.nasa.gov
dirname, /eit/images/eclipse/williams
basename, Williams_College_wl.jpg
extension, jpg

みたいになります。

Source は以下。

String.prototype.trim = function() {
   return this.replace(/^\s+|\s+$/g, '');
}

function Path(str) {
   str = str.trim();

   var path;
   var array;
   var result = new Array();
   var absolute = true;

   _i = str.indexOf(':/');
   if ((_i > 0) && (_i < 6 )) {
      path = str.substring( (_i+2), str.length );
      array = path.split('/');
      array.shift();
      result["domain"] = array.shift();
   } else {
      path = str;
      array = path.split('/');
      if (str.indexOf('/') == 0) {
         array.shift();
      } else {
         absolute = false;
      }
   }

   _len = array.length;

   temp = array.slice(0, (_len - 1));
   if (absolute) {
      result["dirname"] = '/' + temp.join('/');
   } else {
      result["dirname"] = temp.join('/');
   }

   result["basename"] = array[(_len - 1)];

   _index = result["basename"].lastIndexOf('.');
   if (_index != -1) {
      result['extension'] = result['basename'].substring((_index + 1));
   }

   return result;
}

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