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File: jquery.nodesContainingText-1.1.0.js
/*! 
 * jQuery nodesContainingText plugin 
 * 
 * Version: 1.1.0
 * 
 * http://code.google.com/p/jquery-translate/
 * 
 * Copyright (c) 2009 Balazs Endresz (balazs.endresz@gmail.com)
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) 
 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
 * 
 */
 
;(function($){

function Nct(){}

Nct.prototype={
	init: function(jq, o){
		this.textArray = [];
		this.elements = [];
		this.options = o;
		this.jquery = jq;
		this.n = -1;
		if(o.async === true) o.async = 2;
		
		if(o.not){
			jq = jq.not(o.not);
			jq = jq.add( jq.find("*").not(o.not) ).not( $(o.not).find("*") );
		}else{
			jq = jq.add( jq.find("*") );
		}
		this.jq = jq;
		this.jql = this.jq.length;
		return this.process();

	},

	process: function(){
		this.n++;
		var that = this, o = this.options, text = "", hasTextNode = false,
			hasChildNode = false, el = this.jq[this.n], e, c, ret;
		
		if(this.n==this.jql){
			ret = this.jquery.pushStack(this.elements, "nodesContainingText");
			o.complete.call(ret, ret, this.textArray);
			
			if(o.returnAll === false && o.walk === false)
				return this.jquery;
			return ret;
		}
		
		if(!el)
			return this.process();
		e=$(el);

		var nodeName = el.nodeName.toUpperCase(),
			type = nodeName === "INPUT" && $.attr(el, "type").toLowerCase();
		
		if( ({SCRIPT:1, NOSCRIPT:1, STYLE:1, OBJECT:1, IFRAME:1})[ nodeName ] )
			return this.process();
		
		if(typeof o.subject === "string"){
			text=e.attr(o.subject);
		}else{	
			if(o.altAndVal && (nodeName === "IMG" || type === "image" ) )
				text = e.attr("alt");
			else if( o.altAndVal && ({text:1, button:1, submit:1})[ type ] )
				text = e.val();
			else if(nodeName === "TEXTAREA")
				text = e.val();
			else{
				//check childNodes:
				c=el.firstChild;
				if(o.walk !== true)
					hasChildNode = true;
				else{
					while(c){
						if(c.nodeType == 1){
							hasChildNode = true;
							break;
						}
						c=c.nextSibling;
					}
				}

				if(!hasChildNode)
					text = e.text();
				else{//check textNodes:
					if(o.walk !== true)
						hasTextNode = true;
					
					c=el.firstChild;
					while(c){
						if(c.nodeType==3 && c.nodeValue.match(/\S/) !== null){//textnodes with text
							if(c.nodeValue.match(/<![ \r\n\t]*(--([^\-]|[\r\n]|-[^\-])*--[ \r\n\t]*)>/) !== null){
								if(c.nodeValue.match(/(\S+(?=.*<))|(>(?=.*\S+))/) !== null){
									hasTextNode = true;
									break;
								}
							}else{
								hasTextNode = true;
								break;
							}
						}
						c = c.nextSibling;
					}

					if(hasTextNode){//remove child nodes from jq
						//remove scripts:
						text = e.html().replace(/<script[^>]*>([\s\S]*?)<\/script>/gi, "");
						this.jq = this.jq.not( e.find("*") );
					}
				}
			}
		}

		if(!text)
			return this.process();
		this.elements.push(el);
		if(o.comments === false)
			text = this.stripComments(text);
		this.textArray.push(text);

		o.each.call(el, this.elements.length - 1, el, text);
		
		if(o.async){
			setTimeout(function(){that.process();}, o.async);
			return this.jquery;
		}else
			return this.process();
		
	},

	stripComments: function(t){ return t.replace(/<![ \r\n\t]*(--([^\-]|[\r\n]|-[^\-])*--[ \r\n\t]*)>/g, ""); }

}

$.fn.nodesContainingText = function(o){
	o = $.extend({}, defaults, $.fn.nodesContainingText.defaults, o);
	return new Nct().init(this, o);
}

var defaults = {
	not: "",
	async: false,
	each: function(){},
	complete: function(){},
	comments: false,
	returnAll: true,
	walk: true,
	altAndVal: false,
	subject: true
}
	
$.fn.nodesContainingText.defaults = defaults;

})(jQuery);