// ==UserScript==
// @name AdBlock+
// @author Lex1
// @version 1.1.6
// @run-at document-start
// @include *
// @description Css AdBlock for Chrome. Press Alt+A for blocking ads and Alt+U for unblocking. Press Alt+E for editing styles.
// @namespace http://ruzanow.ru/index/0-4
// ==/UserScript==

// Released under the GPL license
// http://www.gnu.org/copyleft/gpl.html


(function(){
	var style, enabled = false, prefix = 'ujs_adblock';
	var none = '{display: none !important;}', highlight = '{background-color: #FF5555 !important; border: 1px solid #FF1111 !important; opacity: 0.7 !important;}', padding = 'iframe, embed, object{padding-left: 16px !important; background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAPCAQAAABHeoekAAAAc0lEQVQY02P4z4AfMlBPAQMzAzNWNlwIRPEygAA7mM3JgGYCL5gSgUrrMCgwsKEqYABKwjg6DGog09AVMDCIgZmmEGlMBexwjiREPaoCmN3GULegKoD6AmI3xC0C6CZwMijD7AZKamLzBRsQwgCYTZ24AAD8Zqzk4ASGSwAAAABJRU5ErkJggg==") no-repeat scroll 0 0 !important;}';

	var getValue = function(name){
		if(window.localStorage){
			return window.localStorage.getItem(name) || '';
		}
		else{
			var eq = name+'=', ca = document.cookie.split(';');
			for(var i = ca.length; i--;){
				var c = ca[i];
				while(c.charAt(0) == ' ')c = c.slice(1);
				if(c.indexOf(eq) == 0)return unescape(c.slice(eq.length));
			};
			return '';
		}
	};
	var setValue = function(name, value, del){
		if(window.localStorage){
			if(del){window.localStorage.removeItem(name)}else{window.localStorage.setItem(name, value)};
		}
		else{
			if(document.cookie.split(';').length < 30 && document.cookie.length-escape(getValue(name)).length+escape(value).length < 4000){
				var date = new Date();
				date.setTime(date.getTime()+((del ? -1 : 10*365)*24*60*60*1000));
				document.cookie = name+'='+escape(value)+'; expires='+date.toGMTString()+'; path=/';
			}
			else{
				alert('Cookies are full!');
			}
		}
	};
	var delEle = function(ele){
		if(ele && ele.parentNode)ele.parentNode.removeChild(ele);
	};
	var addStyle = function(css){
		var s = document.createElement('style');
		s.setAttribute('type', 'text/css');
		s.setAttribute('style', 'display: none !important;');
		s.appendChild(document.createTextNode(css));
		return (document.getElementsByTagName('head')[0] || document.documentElement).appendChild(s);
	};
	var replaceStyle = function(ele, css){
		if(ele){
			while(ele.firstChild)ele.removeChild(ele.firstChild);
			ele.appendChild(document.createTextNode(css));
		}
	};
	var splitCss = function(css){
		var rez = [];
		css.replace(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/g, function(s, m){rez.push(m.replace(/^\s+|\s+$/g, ''))});
		return rez;
	};
	var clearCss = function(css){
		var a = splitCss(css);
		for(var i = a.length; i--;){
			var rule = a[i]+'>';
			for(var j = a.length; j--;){
				if(a[j].indexOf(rule) == 0)a.splice(j, 1);
			}
		};
		return a.join(',');
	};
	var delCss = function(css, del){
		var a = splitCss(css);
		if(del){
			for(var i = a.length; i--;){
				if(del.indexOf(a[i]) == 0)a.splice(i, 1);
			}
		}
		else{
			a.pop();
		};
		return a.join(',');
	};
	var getAtt = function(el, tags){
		var rez = '';
		if(el.attributes){
			var r = new RegExp('^('+tags+')$');
			for(var i = 0, a; a = el.attributes[i]; i++){
				var n = a.nodeName.toLowerCase();
				if(r.test(n))rez += '['+n+'=\x22'+a.nodeValue.replace(/[\x22\x5C]/g, '\\$&')+'\x22]';
			}
		};
		return rez;
	};
	var getNth = function(el){
		var nth, n = 0, p = el.parentNode;
		for(var i = 0, c; c = p.childNodes[i]; i++){if(c.nodeType == 1){n++; if(c == el)nth = n}};
		return (!nth || n < 2) ? '' : ':nth-child('+nth+')';
	};
	var getCssRule = function(el, wide){
		var att, tag, rez = [];
		while(el){
			if(el.nodeType == 1){
				tag = el.nodeName;
				att = getAtt(el, 'src') || getAtt(el, 'href');
				if(att){
					rez.unshift(tag+(wide ? att.replace(/^(\[\w+)(=\x22https?:\/\/)([^?#]+\/[^?#]+\/|[^?#]+).*(\x22\])$/i, '$1^$2$3$4') : att));
					break;
				}
				else{
					att = getAtt(el, 'id|class|height|width|color|bgcolor|align|valign|type');
					rez.unshift(tag+att+((wide != false || /^(html|body)$/i.test(tag)) ? '' : getNth(el)));
					if(wide && att && (document.querySelectorAll ? document.querySelectorAll(tag+att).length == 1 : /\[id=\x22.*?\x22\]|\[class=\x22.*?\x22\]\[|\]\[class=\x22.*?\x22\]/.test(att)))break;
				}
			};
			el = el.parentNode;
		};
		return rez.join('>');
	};
	var setBlockStyle = function(){
		if(document.documentElement instanceof HTMLHtmlElement){
			var css = getValue(prefix);
			if(css)style = addStyle(css+none);
			return true;
		}
	};

	var editStyles = function(){
		var rez = prompt('Please, edit styles:', getValue(prefix));
		if(rez != null){
			setValue(prefix, rez);
			if(rez)rez += none;
			if(style){replaceStyle(style, rez)}else{style = addStyle(rez)};
		}
	};
	var unblockEle = function(latest){
		var padCss, css = getValue(prefix);
		if(enabled || !style || !css)return;

		var remove = function(){
			document.removeEventListener('click', click, false);
			document.removeEventListener('keyup', press, false);
			delEle(padCss);
			enabled = false;
		};
		var click = function(ev){
			ev.preventDefault();
			var oldCss = getValue(prefix);
			var css = delCss(oldCss, getCssRule(ev.target, false));
			if(css == oldCss)css = delCss(oldCss, getCssRule(ev.target, null));
			if(css == oldCss)css = delCss(oldCss, getCssRule(ev.target, true));
			if(css != oldCss)setValue(prefix, css);
			replaceStyle(style, css ? css+(ev.shiftKey ? highlight : none) : '');
			if(!ev.shiftKey)remove();
		};
		var press = function(ev){
			if(ev.keyCode == 27){
				var css = getValue(prefix);
				replaceStyle(style, css ? css+none : '');
				remove();
			}
		};

		if(latest){
			css = delCss(css);
			setValue(prefix, css);
			replaceStyle(style, css ? css+none : '');
		}
		else{
			enabled = true;
			padCss = addStyle(padding);
			replaceStyle(style, css+highlight);
			document.addEventListener('click', click, false);
			document.addEventListener('keyup', press, false);
		}
	};
	var blockEle = function(wide){
		if(enabled)return;
		var css, tmpCss, padCss, ele = '', outline = '', bgColor = '', title = '';

		var remove = function(){
			document.removeEventListener('mouseover', over, false);
			document.removeEventListener('mouseout', out, false);
			document.removeEventListener('click', click, false);
			document.removeEventListener('keyup', press, false);
			delEle(tmpCss);
			delEle(padCss);
			enabled = false;
		};
		var over = function(ev){
			ele = ev.target;
			title = ele.title;
			ele.title = 'Tag: '+ele.nodeName+(ele.id ? ', ID: '+ele.id : '')+(ele.className ? ', Class: '+ele.className : '');
			outline = ele.style.outline;
			ele.style.outline = '1px solid #306EFF';
			bgColor = ele.style.backgroundColor;
			ele.style.backgroundColor = '#C6DEFF';
		};
		var out = function(){
			if(ele){
				ele.title = title;
				ele.style.outline = outline;
				ele.style.backgroundColor = bgColor;
			}
		};
		var click = function(ev){
			if(ele){
				ev.preventDefault();
				out();
				var rules, rule = getCssRule(ele, !wide != !ev.altKey);
				css = css ? (css != (rules = delCss(css, rule)) ? (ev.shiftKey ? rules : css) : css+','+rule) : rule;
				if(tmpCss){replaceStyle(tmpCss, css+highlight)}else{tmpCss = addStyle(css+highlight)};
				if(!ev.shiftKey){
					css = prompt('Block this element(s)?', css);
					if(css){
						rules = getValue(prefix);
						if(rules)css = clearCss(rules+','+css);
						setValue(prefix, css);
						if(style){replaceStyle(style, css+none)}else{style = addStyle(css+none)};
					};
					remove();
				}
			}
		};
		var press = function(ev){
			if(ev.keyCode == 27){
				out();
				remove();
			}
		};

		enabled = true;
		padCss = addStyle(padding);
		document.addEventListener('mouseover', over, false);
		document.addEventListener('mouseout', out, false);
		document.addEventListener('click', click, false);
		document.addEventListener('keyup', press, false);
	};


	// Set style at loading a page
	window.setTimeout(setBlockStyle, 1);

	// Hotkeys
	document.addEventListener('keydown', function(e){
		if(!e.shiftKey && !e.ctrlKey && e.altKey){
			switch(e.keyCode){
				// Edit styles with Alt+E
				case 69: editStyles(); break;
				// Unblock elements with Alt+U
				case 85: unblockEle(); break;
				 // Block element with Alt+B
				case 66: blockEle(); break;
				// Unblock latest element with Alt+L
				case 76: unblockEle(true); break;
				 // Block elements (don't use nth-child) with Alt+A
				case 65: blockEle(true); break;
			}
		}
	}, false);

	// For buttons
	// unsafeWindow.navigator[prefix] = {block: blockEle, edit: editStyles, unblock: unblockEle};
})();