クッキーを使った疑似GM_setValue/getValue

gmsetvalueandgmgetvalueongreasekitsample.user.js

// ==UserScript==
// @name        GM_setValue and GM_getValue on GreaseKit Sample
// @namespace   http://codefairy.org/ns/userscripts
// @include     *
// @version     0.1
// @license     MIT License
// ==/UserScript==

new function() {
	registerGM_value('Foo', 1);

	alert('document.cookie:\n' + document.cookie);
	alert('typeof GM_setValue:\n' + typeof GM_setValue);
	alert('typeof GM_getValue:\n' + typeof GM_getValue);

	alert('foo:\n' + GM_getValue('foo') || 'no data yet');
	alert('bar:\n' + GM_getValue('bar') || 'no data yet');

	GM_setValue('foo', 'GM_setValue test');
	GM_setValue('bar', { obj: 'is ok too!' });


	function registerGM_value(prefix, expireDay) {
		if (!(typeof GM_setValue == 'undefined' && typeof GM_getValue == 'undefined')) return;
		var w = (typeof unsafeWindow != 'undefined') ? unsafeWindow : window;

		// http://svn.coderepos.org/share/lang/javascript/clone/trunk/uneval.js
		/*
		 * $Id: uneval.js,v 0.2 2008/06/13 17:47:18 dankogai Exp dankogai $
		 */
		try{ 
		    eval('uneval'); 
		}catch(e){
		    var protos = [];
		    var char2esc = {'\t':'t','\n':'n','\v':'v','\f':'f','\r':'\r',    
		                    '\'':'\'','\"':'\"','\\':'\\'};
		    var escapeChar = function(c){
		        if (c in char2esc) return '\\' + char2esc[c];
		        var ord = c.charCodeAt(0);
		        return ord < 0x20   ? '\\x0' + ord.toString(16)
		            :  ord < 0x7F   ? '\\'   + c
		            :  ord < 0x100  ? '\\x'  + ord.toString(16)
		            :  ord < 0x1000 ? '\\u0' + ord.toString(16)
		                            : '\\u'  + ord.toString(16)
		    };
		    var uneval_asis = function(o){ return o.toString() };
		    /* predefine objects where typeof(o) != 'object' */
		    var name2uneval = {
			'boolean':uneval_asis,
			'number': uneval_asis,
			'string': function(o){
			    return '\''
			       + o.toString().replace(/[\x00-\x1F\'\"\\\u007F-\uFFFF]/g, escapeChar)
			       + '\''
			},
			'undefined': function(o){ return 'undefined' },
			'function':uneval_asis
		    };

		    var uneval_default = function(o, np){
			var src = []; // a-ha!
			for (var p in o){
			    if (!o.hasOwnProperty(p)) continue;
			    src[src.length] = uneval(p)  + ':' + uneval(o[p], 1);
			}
		        // parens needed to make eval() happy
			return np ? '{' + src.toString() + '}' : '({' + src.toString() + '})';
		    };

		    uneval_set = function(proto, name, func){
			protos[protos.length] = [ proto, name ];
			name2uneval[name] = func || uneval_default;
		    };

		    uneval_set(Array, 'array', function(o){
			var src = [];
			for (var i = 0, l = o.length; i < l; i++)
			    src[i] = uneval(o[i]);
			return '[' + src.toString() + ']';
		    });
		    uneval_set(RegExp, 'regexp', uneval_asis);
		    uneval_set(Date, 'date', function(o){
			return '(new Date(' + o.valueOf() + '))';
		    });

		    var typeName = function(o){
			// if (o === null) return 'null';
			var t = typeof o;
			if (t != 'object') return t;
			// we have to lenear-search. sigh.
			for (var i = 0, l = protos.length; i < l; i++){
			    if (o instanceof  protos[i][0]) return protos[i][1];
			}
			return 'object';
		    };

		    w.uneval = function(o, np){
			// if (o.toSource) return o.toSource();
			if (o === null) return 'null';
			var func = name2uneval[typeName(o)] || uneval_default;
			return func(o, np);
		    }
		}

		w.GM_setValue = function(key, value) {
			var expire, date;
			if (value == '') // clear
				expire = -1;
			else {
				value = uneval(value);
				date = new Date;
				date.setTime(date.getTime() + 1000 * 60 * 60 * 24 * expireDay);
				expire = date.toUTCString();
			}

			document.cookie = [
				prefix+key+'='+encodeURIComponent(value),
				'expires='+expire,
				'path=/'
			].join(';');
		};

		w.GM_getValue = function(key) {
			var find = new RegExp('^'+prefix+key+'=(.+)$');
			var trim = /^\s+|\s+$/g;
			var cookies = document.cookie.split(';');

			for (var i = 0, length = cookies.length; i < length; i++) {
				var cookie = cookies[i].replace(trim, '');
				var c = find.exec(cookie);
				if (c) return decodeURIComponent(c[1]);
			}
		};
	}
}