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XPath

xpath Function

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greasyfork.org/scripts/29174/189853/XPath.js 

// ==UserScript==
// @name           XPath
// @namespace      http://gm.wesley.eti.br/includes
// @description    xpath Function
// @author         w35l3y
// @email          w35l3y@brasnet.org
// @copyright      2009+, w35l3y (http://gm.wesley.eti.br)
// @license        GNU GPL
// @homepage       http://gm.wesley.eti.br
// @version        1.0.0.5
// @language       en
// @include        nowhere
// ==/UserScript==

/**************************************************************************

	Author 's NOTE

    Original http://lowreal.net/blog/2007/11/17/1

***************************************************************************

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

**************************************************************************/

XPath = Xpath = xpath = function()
{
    var a = Array.prototype.slice.call(arguments),	// args
        e = a[0],	// expression
        c = a[1],	// context
        t = a[2];	// type

    if (typeof c == "function")
    {
        t = c;
        c = null;
    }
    if (!c)
        c = document.documentElement||document;
    var d = c.ownerDocument || c;
    e = d.createExpression(e, function(p)
                           {
        var o = d.createNSResolver(c).lookupNamespaceURI(p);

        if (o)
            return o;
        else switch (c.contentType)
        {
            case "text/xhtml":
            case "application/xhtml+xml":
                return "http://www.w3.org/1999/xhtml";
            default:
                return "";
        }
    });

    switch (t)
    {
        case String:
            return e.evaluate(c, XPathResult.STRING_TYPE, null).stringValue;
        case Number:
            return e.evaluate(c, XPathResult.NUMBER_TYPE, null).numberValue;
        case Boolean:
            return e.evaluate(c, XPathResult.BOOLEAN_TYPE, null).booleanValue;
        case Array:
            var r = e.evaluate(c, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null),
                o = [];

            for ( var ai = 0 , at = r.snapshotLength ; ai < at ; ++ai )
                o.push(r.snapshotItem(ai));

            return o;
        case undefined:
            r = e.evaluate(c, XPathResult.ANY_TYPE, null);
            switch (r.resultType)
            {
                case XPathResult.STRING_TYPE:
                    return r.stringValue;
                case XPathResult.NUMBER_TYPE:
                    return r.numberValue;
                case XPathResult.BOOLEAN_TYPE:
                    return r.booleanValue;
                case XPathResult.UNORDERED_NODE_ITERATOR_TYPE:
                    var o = [], i;
                    while (i == r.iterateNext())
                        o.push(i);

                    return o;
            }
            return null;
        default:
            throw(TypeError("xpath: specified type is not valid type."));
    }
};