/*

 * jQuery Highlight Regex Plugin

 *

 * Based on highlight v3 by Johann Burkard

 * http://johannburkard.de/blog/programming/javascript/highlight-javascript-text-higlighting-jquery-plugin.html

 *

 * (c) 2009-10 Jacob Rothstein

 * MIT license

 */



;(function($) {

    var normalize = function(node) {

        if (!( node && node.childNodes )) return;



        var children = $.makeArray(node.childNodes), prevTextNode = null;

        $.each (children, function(i, child) {

            if (child.nodeType === 3) {

                if (child.nodeValue === "") {

                    node.removeChild(child)

                } else if (prevTextNode !== null) {

                    prevTextNode.nodeValue += child.nodeValue;

                    node.removeChild(child);

                } else { prevTextNode = child; }

            } else {

                prevTextNode = null

                if (child.childNodes) normalize(child)

            }

        })



    }



    $.fn.highlightRegex = function(regex) {

        if (typeof regex === 'undefined' || regex.source === '') {

            $(this).find('span.highlight').each(function() {

                $(this).replaceWith($(this).text());

                normalize ($(this).parent().get(0));

            });

        } else {

            $(this).each(function() {

                var elt = $(this).get(0)



                normalize(elt)



                $.each($.makeArray(elt.childNodes), function(i, searchnode){

                    var spannode, middlebit, middleclone, pos, match, parent;

                    normalize(searchnode)



                    if(searchnode.nodeType == 3) {

                        while (searchnode.data && (pos = searchnode.data.search(regex)) >= 0) {



                            match = searchnode.data.slice(pos).match(regex)[0];



                            if (match.length > 0) {

                                spannode = document.createElement('span');

                                spannode.className = 'highlight';



                                parent      = searchnode.parentNode;

                                middlebit   = searchnode.splitText(pos);

                                searchnode  = middlebit.splitText(match.length);

                                middleclone = middlebit.cloneNode(true);



                                spannode.appendChild(middleclone);

                                parent.replaceChild(spannode, middlebit);



                            } else break;

                        }

                    } else {

                        $(searchnode).highlightRegex(regex);

                    }

                })

                    })

                }

        return $(this);

    }

})(jQuery);