/*
* jQuery Highlight plugin
*
* Based on highlight v3 by Johann Burkard
* http://johannburkard.de/blog/programming/javascript/highlight-javascript-text-higlighting-jquery-plugin.html
*
* Code a little bit refactored and cleaned (in my humble opinion).
* Most important changes:
*  - has an option to highlight only entire words only (wordsOnly - false by default),
*  - has an option to be case sensitive (caseSensitive - false by default)
*  - highlight element tag and class names can be specified in options
*
* Usage:
*   // wrap every occurrance of text 'lorem' in content
*   // with <span class='highlight'> (default options)
*   $('#content').highlight('lorem');
*
*   // search for and highlight more terms at once
*   // so you can save some time on traversing DOM
*   $('#content').highlight(['lorem', 'ipsum']);
*   $('#content').highlight('lorem ipsum');
*
*   // search only for entire word 'lorem'
*   $('#content').highlight('lorem', { wordsOnly: true });
*
*   // don't ignore case during search of term 'lorem'
*   $('#content').highlight('lorem', { caseSensitive: true });
*
*   // wrap every occurrance of term 'ipsum' in content
*   // with <em class='important'>
*   $('#content').highlight('ipsum', { element: 'em', className: 'important' });
*
*   // remove default highlight
*   $('#content').unhighlight();
*
*   // remove custom highlight
*   $('#content').unhighlight({ element: 'em', className: 'important' });
*
*
* Copyright (c) 2009 Bartek Szopka
*
* Licensed under MIT license.
*
*/
function indexOfArray(array, value) {
    var m = array.length;
    for (var i = 0; i < m; i++) {
        if (array[i] == value)
            return i;
    }
    return -1;

}
var wordsFound = new Array();
jQuery.extend({
    highlight: function(node, re, nodeName, className) {
        
        if (node.nodeType === 3) {
            var match = node.data.match(re);
            if (match) {
                if(indexOfArray(wordsFound,match[0])>-1)
                    return 0;
                
                wordsFound.push(match[0]);
                
                var highlight = document.createElement(nodeName || 'span');
                highlight.className = className || 'highlight';
                var wordNode = node.splitText(match.index);
                wordNode.splitText(match[0].length);
                var wordClone = wordNode.cloneNode(true);
                highlight.appendChild(wordClone);
                wordNode.parentNode.replaceChild(highlight, wordNode);
                return 1; //skip added node in parent
            }
        } else if ((node.nodeType === 1 && node.childNodes) && // only element nodes that have children
                !/(script|style)/i.test(node.tagName) && // ignore script and style nodes
                !(node.tagName === nodeName.toUpperCase() && node.className === className)) { // skip if already highlighted
            for (var i = 0; i < node.childNodes.length; i++) {
                i += jQuery.highlight(node.childNodes[i], re, nodeName, className);
            }
        }
        return 0;
    }
});

jQuery.fn.unhighlight = function(options) {
    var settings = { className: 'highlight', element: 'span' };
    jQuery.extend(settings, options);

    return this.find(settings.element + "." + settings.className).each(function() {
        var parent = this.parentNode;
        parent.replaceChild(this.firstChild, this);
        parent.normalize();
    }).end();
};

jQuery.fn.highlight = function(words, options) {
    var settings = { className: 'highlight', element: 'span', caseSensitive: false, wordsOnly: false };
    jQuery.extend(settings, options);

    if (words.constructor === String) {
        words = [words];
    }

    var flag = settings.caseSensitive ? "" : "i";
    var pattern = "(" + words.join("|") + ")";
    if (settings.wordsOnly) {
        pattern = "\\b" + pattern + "\\b";
    }
    var re = new RegExp(pattern, flag);
    
    return this.each(function() {
        jQuery.highlight(this, re, settings.element, settings.className);
    });
};