// ==UserScript==
// @name        Essai
// @namespace   sebsauvage.net
// @include     http://sebsauvage.net/links/*
// ==/UserScript==


(function () {
    // Removes all occurences of elements whose XPath is provided from the document.
    //
    // Example: Remove all tables which use the CSS class 'toto':
    //          removeElement("//table[@class='toto']");
    function removeElement(ElementXpath)
    {
        var alltags = document.evaluate(ElementXpath,document,null,XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,null);
        for (i=0; i<alltags.snapshotLength; i++)
        {
            element = alltags.snapshotItem(i);
            element.parentNode.removeChild(element);  // Remove this element from its parent.
        }
    }  
    
    // Removes an attribute from all occurences of elements whose XPath is provided.
    // (All occurences of this elements are processed.)
    //
    // Example: Remove the bgcolor of all <table>:
    //          removeAttributeOfElement('bgcolor',"//table[@bgcolor]")
    //          Remove the fixed with of all tables or cells::
    //          removeAttributeOfElement('width',"//table[@width]|//td[@width]")
    function removeAttributeOfElement(attributeName,ElementXpath)
    {
        var alltags = document.evaluate(ElementXpath,document,null,XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,null);
        for (i=0; i<alltags.snapshotLength; i++)
            alltags.snapshotItem(i).removeAttribute(attributeName);    
    }
    
    // Set an attribute from all occurences of elements to a specified value.
    // The previous value of this attribute is discarded.
    // (All occurences of this elements are processed.)
    //
    // Example: Set with to 80 columns on all texteareas:
    //          setAttributeOfElement('cols',80,"//textarea")
    function setAttributeOfElement(attributeName,attributeValue,ElementXpath)
    {
        var alltags = document.evaluate(ElementXpath,document,null,XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,null);
        for (i=0; i<alltags.snapshotLength; i++)
            alltags.snapshotItem(i).setAttribute(attributeName, attributeValue)
    }    
      
    // Inject your own CSS in the page.
    // Example: Do not underline link:
    //          injectCSS("a{text-decoration: none;}")
    function injectCSS(cssdata)
    {
        head = document.getElementsByTagName("head")[0];
        style = document.createElement("style");
        style.setAttribute("type", 'text/css');
        style.innerHTML = cssdata;
        head.appendChild(style);
    }

    // Converts an image to text.
    // Attributes, links and javascript actions are preserved.
    //
    // Examples: imageToText("//img[@src='/forum/images/editer-bleu.png']","[Editer]")
    //           imageToText("//img[@src='/images/g.gif' or @src='../images/g.gif']","[Gras] "),
    function imageToText(ElementXpath,text)
    {
        var alltags = document.evaluate(ElementXpath,document,null,XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,null);
        for (i=0; i<alltags.snapshotLength; i++)
        {
            tag = alltags.snapshotItem(i)
            lien = document.createTextNode(text)
            tag.parentNode.replaceChild(lien, tag);
        }    
    }
    
    try
    {
        // Mettez votre code ici. EXEMPLES:
        
        // Supprimer des actions Javascript sur certains éléments d'un formulaire.
        removeAttributeOfElement('onfocus',"//input[@name='titre']");
        removeAttributeOfElement('onblur',"//input[@name='titre']");
        
        // Supprimer toutes les couleurs de fond:
        injectCSS('* { color: None !important; background: None !important; background-color: None !important; }');
        
        // supprimer les couleurs des tableaux:
        removeAttributeOfElement('bgcolor',"//td");
        removeAttributeOfElement('bgcolor',"//table");
        
        // forcer la largeur d'un textarea:
        setAttributeOfElement('cols','120',"//textarea[@name='message']");  
        
        // Convertir une image en texte:
        imageToText("//img[@src='/images/btn_gras.gif']","[Gras]");
        
        // et divers autres exemples en vrac, histoire de montrer quelques possibilité de XPath:
        removeElement("//div/p/b[starts-with(.,'tous les utilisateurs du site se doivent de respecter les autres')]/../../*[position()>=6 and position()<=9]");
        removeElement("//th[text()='Nombre de discussions']/ancestor::table[1]");
        setAttributeOfElement('style','font-weight:bold; background-color:#FFFFE8',"//tr/td[position()=last() and text()='0']/../descendant::*");
        setAttributeOfElement('style','font-size:8pt;','//tr[@class=\"fb\"]/td')
        removeElement("//span[@class='Datered' or @class='Dategris' or @class='Date']/following-sibling::br");
        removeElement("//div[@id='colonneDroite']/div/div/h2[text()='Extraits de la charte']/ancestor::div[1]"); 
    }
    catch (e)
    {
        alert("UserScript exception:\n" + e);
    }

})();