// ==UserScript==
// @name YenTxt 4Chan
// @description adds purple text to yen signs(¥). Alt code 0165 on EN US keyboards
// @author tested and developed by /qa/
// @namespace /qa/
// @version 2016.10.17.1
// @match *://boards.4chan.org/*
// @grant none
// @downloadURL none
// ==/UserScript==

function makePurple(root){
    if(root.nodeType !== Node.ELEMENT_NODE){
        return;
    }

    var nodes = Array.from(root.getElementsByClassName('postMessage'));
    if(root.classList.contains('postmessage')){
        nodes.unshift(root);
    }

    nodes.forEach(function(node){
        if(node.textContent.indexOf('\xa5') <= -1){
            return;
        }
        var txtItterator = document.createNodeIterator(node, NodeFilter.SHOW_TEXT);
        var txtNode;
        while((txtNode = txtItterator.nextNode())){
            var hashIndex = txtNode.textContent.indexOf('\xa5');
            if(hashIndex > -1){
                var splitNode = txtNode.splitText(hashIndex);

                var span = document.createElement('span');
                span.style.color = "#9370DB";
                span.className = "the_m_Word";

                span.appendChild(splitNode);
                txtNode.parentNode.insertBefore(span, txtNode.nextSibling);

                txtItterator.nextNode();
            }
        }
    });
}

makePurple(document.body);

new MutationObserver(function(mutations){
    mutations.forEach(function(mutation){
        mutation.addedNodes.forEach(makePurple);
    });
}).observe(document.body, {childList: true, subtree: true});