/*
 * 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 (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.
 * url : http://bartaz.github.io/sandbox.js/jquery.highlight.html
 */

function addHighlightFunction() {
	jQuery.extend({
	    highlight: function (node, re, nodeName, className) {
	        if (node.nodeType === 3) {
	            var match = node.data.match(re);
	            if (match) {
	                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;
	    }
	});
}

addHighlightFunction();

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];
    }
    words = jQuery.grep(words, function(word, i){
      return word != '';
    });
    words = jQuery.map(words, function(word, i) {
      return word.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
    });
    if (words.length == 0) { return this; };

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