From c2a6262807078eaac235c8d2202a71da79511e1a Mon Sep 17 00:00:00 2001
From: Ori Livneh <ori@wikimedia.org>
Date: Tue, 11 Aug 2015 12:33:43 -0700
Subject: [PATCH] Remove IE6 CSS hover support

The hover effect is not a basic usability requirement.
Having this ancient cruft in our HTML depresses me.

Change-Id: I0ca5b3b6a6037a9ec733283c656996969cc020e3
---
 SkinVector.php   |  12 +-
 csshover.htc     | 284 -----------------------------------------------
 csshover.min.htc |  12 --
 3 files changed, 1 insertion(+), 307 deletions(-)
 delete mode 100644 csshover.htc
 delete mode 100644 csshover.min.htc

diff --git a/SkinVector.php b/SkinVector.php
index 5d14628ae..f8cf6c3ba 100644
--- a/SkinVector.php
+++ b/SkinVector.php
@@ -51,17 +51,7 @@ class SkinVector extends SkinTemplate {
 			$out->addModuleStyles( 'skins.vector.styles.responsive' );
 		}
 
-		// Append CSS which includes IE only behavior fixes for hover support -
-		// this is better than including this in a CSS file since it doesn't
-		// wait for the CSS file to load before fetching the HTC file.
-		$min = $this->getRequest()->getFuzzyBool( 'debug' ) ? '' : '.min';
-		$out->addHeadItem( 'csshover',
-			'<!--[if lt IE 7]><style type="text/css">body{behavior:url("' .
-				htmlspecialchars( $this->getConfig()->get( 'LocalStylePath' ) ) .
-				"/{$this->stylename}/csshover{$min}.htc\")}</style><![endif]-->"
-		);
-
-		$out->addModules( array( 'skins.vector.js' ) );
+		$out->addModules( 'skins.vector.js' );
 	}
 
 	/**
diff --git a/csshover.htc b/csshover.htc
deleted file mode 100644
index a13ea68da..000000000
--- a/csshover.htc
+++ /dev/null
@@ -1,284 +0,0 @@
-<public:attach event="ondocumentready" onevent="CSSHover()" />
-<script>
-/**
- *	Whatever:hover - V3.11
- *	------------------------------------------------------------
- *	Author  - Peter Nederlof, http://www.xs4all.nl/~peterned
- *	License - http://creativecommons.org/licenses/LGPL/2.1
- *
- *	Special thanks to Sergiu Dumitriu, http://purl.org/net/sergiu,
- *	for fixing the expression loop.
- *
- *	Whatever:hover is free software; you can redistribute it and/or
- *	modify it under the terms of the GNU Lesser General Public
- *	License as published by the Free Software Foundation; either
- *	version 2.1 of the License, or (at your option) any later version.
- *
- *	Whatever:hover is distributed in the hope that it will be useful,
- *	but WITHOUT ANY WARRANTY; without even the implied warranty of
- *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- *	Lesser General Public License for more details.
- *
- *	howto: body { behavior:url("csshover3.htc"); }
- *	------------------------------------------------------------
- */
-
-window.CSSHover = (function(){
-
-	// regular expressions, used and explained later on.
-	var REG_INTERACTIVE = /(^|\s)((([^a]([^ ]+)?)|(a([^#.][^ ]+)+)):(hover|active|focus))/i;
-	var REG_AFFECTED = /(.*?)\:(hover|active|focus)/i;
-	var REG_PSEUDO = /[^:]+:([a-z\-]+).*/i;
-	var REG_SELECT = /(\.([a-z0-9_\-]+):[a-z]+)|(:[a-z]+)/gi;
-	var REG_CLASS = /\.([a-z0-9_\-]*on(hover|active|focus))/i;
-	var REG_MSIE = /msie (5|6|7)/i;
-	var REG_COMPAT = /backcompat/i;
-
-	// property mapping, real css properties must be used in order to clear expressions later on...
-	// Uses obscure css properties that no-one is likely to use. The properties are borrowed to
-	// set an expression, and are then restored to the most likely correct value.
-	var Properties = {
-		index: 0,
-		list: ['text-kashida', 'text-kashida-space', 'text-justify'],
-		get: function() {
-			return this.list[(this.index++)%this.list.length];
-		}
-	};
-
-	// camelize is used to convert css properties from (eg) text-kashida to textKashida
-	var camelize = function(str) {
-		return str.replace(/-(.)/mg, function(result, match){
-			return match.toUpperCase();
-		});
-	};
-	
-	/**
-	 *	Local CSSHover object
-	 *	--------------------------
-	 */
-	
-	var CSSHover = {
-		
-		// array of CSSHoverElements, used to unload created events
-		elements: [], 
-		
-		// buffer used for checking on duplicate expressions
-		callbacks: {}, 
-		
-		// init, called once ondomcontentready via the exposed window.CSSHover function
-		init:function() {
-			// don't run in IE8 standards; expressions don't work in standards mode anyway, 
-			// and the stuff we're trying to fix should already work properly
-			if(!REG_MSIE.test(navigator.userAgent) && !REG_COMPAT.test(window.document.compatMode)) {
-				return;
-			}
-
-			// start parsing the existing stylesheets
-			var sheets = window.document.styleSheets, l = sheets.length;
-			for(var i=0; i<l; i++) {
-				this.parseStylesheet(sheets[i]);
-			}
-		},
-
-		// called from init, parses individual stylesheets
-		parseStylesheet:function(sheet) {
-			// check sheet imports and parse those recursively
-			if(sheet.imports) {
-				try {
-					var imports = sheet.imports;
-					var l = imports.length;
-					for(var i=0; i<l; i++) {
-						this.parseStylesheet(sheet.imports[i]);
-					}
-				} catch(securityException){
-					// trycatch for various possible errors
-				}
-			}
-			
-			// interate the sheet's rules and send them to the parser
-			try {
-				var rules = sheet.rules;
-				var r = rules.length;
-				for(var j=0; j<r; j++) {
-					this.parseCSSRule(rules[j], sheet);
-				}
-			} catch(someException){
-				// trycatch for various errors, most likely accessing the sheet's rules.
-			}
-		},
-
-		// magic starts here ...
-		parseCSSRule:function(rule, sheet) {
-			
-			// The sheet is used to insert new rules into, this must be the same sheet the rule 
-			// came from, to ensure that relative paths keep pointing to the right location.
-
-			// only parse a rule if it contains an interactive pseudo.
-			var select = rule.selectorText;
-			if(REG_INTERACTIVE.test(select)) {
-				var style = rule.style.cssText;
-					
-				// affected elements are found by truncating the selector after the interactive pseudo,
-				// eg: "div li:hover" >>  "div li"
-				var affected = REG_AFFECTED.exec(select)[1];
-					
-				// that pseudo is needed for a classname, and defines the type of interaction (focus, hover, active)
-				// eg: "li:hover" >> "onhover"
-				var pseudo = select.replace(REG_PSEUDO, 'on$1');
-					
-				// the new selector is going to use that classname in a new css rule,
-				// since IE6 doesn't support multiple classnames, this is merged into one classname
-				// eg: "li:hover" >> "li.onhover",  "li.folder:hover" >> "li.folderonhover"
-				var newSelect = select.replace(REG_SELECT, '.$2' + pseudo);
-					
-				// the classname is needed for the events that are going to be set on affected nodes
-				// eg: "li.folder:hover" >> "folderonhover"
-				var className = REG_CLASS.exec(newSelect)[1];
-
-				// no need to set the same callback more than once when the same selector uses the same classname
-				var hash = affected + className;
-				if(!this.callbacks[hash]) {
-					
-					// affected elements are given an expression under a borrowed css property, because fake properties
-					// can't have their expressions cleared. Different properties are used per pseudo, to avoid
-					// expressions from overwriting eachother. The expression does a callback to CSSHover.patch, 
-					// rerouted via the exposed window.CSSHover function.
-					var property = Properties.get();
-					var atRuntime = camelize(property);
-
-					// because the expression is added to the stylesheet, and styles are always applied to html that is
-					// dynamically added to the dom, the expression will also trigger for those new elements (provided
-					// they are selected by the affected selector). 
-					sheet.addRule(affected, property + ':expression(CSSHover(this, "'+pseudo+'", "'+className+'", "'+atRuntime+'"))');
-					
-					// hash it, so an identical selector/class combo does not duplicate the expression
-					this.callbacks[hash] = true;
-				}
-				
-				// duplicate expressions need not be set, but the style could differ
-				sheet.addRule(newSelect, style);
-			}
-		},
-
-		// called via the expression, patches individual nodes
-		patch:function(node, type, className, property) {
-
-			// restores the borrowed css property to the value of its immediate parent, clearing
-			// the expression so that it's not repeatedly called. 
-			try {
-				var value = node.parentNode.currentStyle[property];
-				node.style[property] = value;	
-			} catch(e) {
-				// the above reset should never fail, but just in case, clear the runtimeStyle if it does.
-				// this will also stop the expression.
-				node.runtimeStyle[property] = '';
-			}			
-		
-			// just to make sure, also keep track of patched classnames locally on the node
-			if(!node.csshover) {
-				node.csshover = [];
-			}
-
-			// and check for it to prevent duplicate events with the same classname from being set
-			if(!node.csshover[className]) {
-				node.csshover[className] = true;
-
-				// create an instance for the given type and class
-				var element = new CSSHoverElement(node, type, className);
-				
-				// and store that instance for unloading later on
-				this.elements.push(element);
-			}
-
-			// returns a dummy value to the expression
-			return type;
-		},
-
-		// unload stuff onbeforeunload
-		unload:function() {
-			try {
-				
-				// remove events
-				var l = this.elements.length;
-				for(var i=0; i<l; i++) {
-					this.elements[i].unload();
-				}
-
-				// and set properties to null 
-				this.elements = [];
-				this.callbacks = {};
-
-			} catch (e) {
-			}
-		}
-	};
-
-	/**
-	 *	CSSHoverElement
-	 *	--------------------------
-	 */
-
-	// the event types associated with the interactive pseudos
-	var CSSEvents = {
-		onhover:  { activator: 'onmouseenter', deactivator: 'onmouseleave' },
-		onactive: { activator: 'onmousedown',  deactivator: 'onmouseup' },
-		onfocus:  { activator: 'onfocus',      deactivator: 'onblur' }
-	};
-	
-	// CSSHoverElement constructor, called via CSSHover.patch
-	function CSSHoverElement(node, type, className) {
-
-		// the CSSHoverElement patches individual nodes by manually applying the events that should 
-		// have fired by the css pseudoclasses, eg mouseenter and mouseleave for :hover. 
-
-		this.node = node;
-		this.type = type;
-		var replacer = new RegExp('(^|\\s)'+className+'(\\s|$)', 'g');
-
-		// store event handlers for removal onunload
-		this.activator =   function(){ node.className += ' ' + className; };
-		this.deactivator = function(){ node.className = node.className.replace(replacer, ' '); };
-		
-		// add the events
-		node.attachEvent(CSSEvents[type].activator, this.activator);
-		node.attachEvent(CSSEvents[type].deactivator, this.deactivator);
-	}
-	
-	CSSHoverElement.prototype = {
-		// onbeforeunload, called via CSSHover.unload
-		unload:function() {
-
-			// remove events 
-			this.node.detachEvent(CSSEvents[this.type].activator, this.activator);
-			this.node.detachEvent(CSSEvents[this.type].deactivator, this.deactivator);
-
-			// and set properties to null 
-			this.activator = null;
-			this.deactivator = null;
-			this.node = null;
-			this.type = null;
-		}
-	};
-
-	// add the unload to the onbeforeunload event
-	window.attachEvent('onbeforeunload', function(){
-		CSSHover.unload();
-	});
-
-	/**
-	 *	Public hook
-	 *	--------------------------
-	 */
-	
-	return function(node, type, className, property) {
-		if(node) {
-			// called via the css expression; patches individual nodes
-			return CSSHover.patch(node, type, className, property);
-		} else {
-			// called ondomcontentready via the public:attach node
-			CSSHover.init();
-		}
-	};
-
-})();
-</script>
\ No newline at end of file
diff --git a/csshover.min.htc b/csshover.min.htc
deleted file mode 100644
index 7e5c57b33..000000000
--- a/csshover.min.htc
+++ /dev/null
@@ -1,12 +0,0 @@
-<public:attach event="ondocumentready" onevent="CSSHover()" />
-<script>
-/**
- * Whatever:hover - V3.11
- * http://www.xs4all.nl/~peterned/
- *	
- * Copyright (c) 2009 Peter Nederlof
- * Licensed under the LGPL license
- * http://creativecommons.org/licenses/LGPL/2.1
- */
-window.CSSHover=(function(){var m=/(^|\s)((([^a]([^ ]+)?)|(a([^#.][^ ]+)+)):(hover|active|focus))/i;var n=/(.*?)\:(hover|active|focus)/i;var o=/[^:]+:([a-z\-]+).*/i;var p=/(\.([a-z0-9_\-]+):[a-z]+)|(:[a-z]+)/gi;var q=/\.([a-z0-9_\-]*on(hover|active|focus))/i;var s=/msie (5|6|7)/i;var t=/backcompat/i;var u={index:0,list:['text-kashida','text-kashida-space','text-justify'],get:function(){return this.list[(this.index++)%this.list.length]}};var v=function(c){return c.replace(/-(.)/mg,function(a,b){return b.toUpperCase()})};var w={elements:[],callbacks:{},init:function(){if(!s.test(navigator.userAgent)&&!t.test(window.document.compatMode)){return}var a=window.document.styleSheets,l=a.length;for(var i=0;i<l;i++){this.parseStylesheet(a[i])}},parseStylesheet:function(a){if(a.imports){try{var b=a.imports;var l=b.length;for(var i=0;i<l;i++){this.parseStylesheet(a.imports[i])}}catch(securityException){}}try{var c=a.rules;var r=c.length;for(var j=0;j<r;j++){this.parseCSSRule(c[j],a)}}catch(someException){}},parseCSSRule:function(a,b){var c=a.selectorText;if(m.test(c)){var d=a.style.cssText;var e=n.exec(c)[1];var f=c.replace(o,'on$1');var g=c.replace(p,'.$2'+f);var h=q.exec(g)[1];var i=e+h;if(!this.callbacks[i]){var j=u.get();var k=v(j);b.addRule(e,j+':expression(CSSHover(this, "'+f+'", "'+h+'", "'+k+'"))');this.callbacks[i]=true}b.addRule(g,d)}},patch:function(a,b,c,d){try{var f=a.parentNode.currentStyle[d];a.style[d]=f}catch(e){a.runtimeStyle[d]=''}if(!a.csshover){a.csshover=[]}if(!a.csshover[c]){a.csshover[c]=true;var g=new CSSHoverElement(a,b,c);this.elements.push(g)}return b},unload:function(){try{var l=this.elements.length;for(var i=0;i<l;i++){this.elements[i].unload()}this.elements=[];this.callbacks={}}catch(e){}}};var x={onhover:{activator:'onmouseenter',deactivator:'onmouseleave'},onactive:{activator:'onmousedown',deactivator:'onmouseup'},onfocus:{activator:'onfocus',deactivator:'onblur'}};function CSSHoverElement(a,b,c){this.node=a;this.type=b;var d=new RegExp('(^|\\s)'+c+'(\\s|$)','g');this.activator=function(){a.className+=' '+c};this.deactivator=function(){a.className=a.className.replace(d,' ')};a.attachEvent(x[b].activator,this.activator);a.attachEvent(x[b].deactivator,this.deactivator)}CSSHoverElement.prototype={unload:function(){this.node.detachEvent(x[this.type].activator,this.activator);this.node.detachEvent(x[this.type].deactivator,this.deactivator);this.activator=null;this.deactivator=null;this.node=null;this.type=null}};window.attachEvent('onbeforeunload',function(){w.unload()});return function(a,b,c,d){if(a){return w.patch(a,b,c,d)}else{w.init()}}})();
-</script>