最近つけたタグ強調Greasemonkey(キャッシュする版)

「最近つけたタグ強調JavaScript」は毎回RSSを取得していて、負荷的によくないかと思い、 30分キャッシュするようにしてみました。

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// ==UserScript==
 // @name        Hanena Bookmark Tag Filter
 // @namespace   http://fuktommy.com/js/
 // @description Accent recent userd tag at add entry page.
 // @include     http://b.hatena.ne.jp/add?mode=confirm&*
 // ==/UserScript==
 
 // Copyright (c) 2008 Satoshi Fukutomi <info@fuktommy.com>.
 // http://fuktommy.com/js/hatebu_tagfilter.user.js
 // Distributed under new BSD license
 // http://fuktommy.com/bsdl
 
 (function() {
     function resizeTags(cloud) {
         var tags = document.getElementById('tags_list').getElementsByTagName('span');
         for (var i=tags.length-1; i>=0; i--) {
             var tag = tags[i].innerHTML;
             if (cloud[tag]) {
                 tags[i].style.fontSize = '20pt';
             }
         }
     }
 
     function loadTagsFromCache() {
         var cloud = {};
         var now = (new Date()).getTime() / 1000;
         if (GM_getValue('cache_time', 0) + 1800*1000 < now) {
             return false;
         } else {
             var cached = GM_getValue('tags', '');
             var tags = cached.split('[]');
             for (var i=tags.length-1; i>=0; i--) {
                 cloud[decodeURIComponent(tags[i])] = true;
             }
             resizeTags(cloud);
             return true;
         }
     }
 
     function loadTagsFromXML(xml) {
         var cloud = {};
         var cached = '';
         var subjects = xml.getElementsByTagName('dc:subject');
         if (subjects.length == 0) {
             subjects = xml.getElementsByTagName('subject');
         }
         for (var i=subjects.length-1; i>0; i--) {
            cloud[subjects[i].firstChild.nodeValue] = true;
            cached += encodeURIComponent(subjects[i].firstChild.nodeValue) + '[]';
         }
         if (subjects.length > 0) {
             cloud[subjects[0].firstChild.nodeValue] = true;
             cached += encodeURIComponent(subjects[i].firstChild.nodeValue);
         }
         var now = Math.floor((new Date()).getTime() / 1000);
         GM_setValue('cache_time', now);
         GM_setValue('tags', cached);
 
         var tags = document.getElementById('tags_list').getElementsByTagName('span');
         for (var i=tags.length-1; i>=0; i--) {
             var tag = tags[i].innerHTML;
             if (cloud[tag]) {
                 tags[i].style.fontSize = '20pt';
             }
         }
     }
 
     function getUsername() {
         var anchor = document.getElementsByTagName('a');
         for (var i=anchor.length-1; i>=0; i--) {
             if (anchor[i].className == 'username') {
                 return anchor[i].firstChild.nodeValue;
             }
         }
         return null;
     }
 
     function readFeed() {
         if (loadTagsFromCache()) {
             return;
         }
 
         var username = getUsername();
         if (! username) {
             return;
         }
         var request = new XMLHttpRequest();
         request.onreadystatechange = function () {
             if ((request.readyState == 4) && (request.status == 200)) {
                 loadTagsFromXML(request.responseXML);
             }
         }
         request.open('GET', 'http://b.hatena.ne.jp/' + username + '/rss', true);
         request.send(null);
     }
 
     window.addEventListener('load', readFeed, false);
 })();

Original Article: http://blog.fuktommy.com/1206024560