Handle closed mode shadow for /deep/ and ::shadow selectors

Source/core/css/SelectorChecker.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 291 matching lines @@
 
 SelectorChecker::Match SelectorChecker::matchForPseudoShadow(const SelectorCheckingContext& context, const ContainerNode* node, MatchResult& result) const
 {
     if (!isOpenShadowRoot(node))
         return SelectorFailsCompletely;
     if (!context.previousElement)
         return SelectorFailsCompletely;
     return matchSelector(context, result);
 }
 
+static inline Element* parentOrOpenShadowHostElement(const Element* element)

[hayato, 2015/08/20 07:09:59]

This might be confusing name because shadow host's open-ness is irrelevant here.
Could it have better name?

[hayato, 2015/08/20 07:09:59]

const Element&

[kochi, 2015/08/20 07:32:50]

How about parentOrShadowHostElementWithoutExceedingClosedBoundary()?

[kochi, 2015/08/20 07:32:50]

Done.

[hayato, 2015/08/20 10:16:29]

I would prefer parentOrShadowHostButDisallowEscapingClosedShadowTree, which was
the former name. :)

I'd like to avoid using a term of *boundary* in general becase the spec doesn'
define it.

+{
+    if (element->parentNode() && element->parentNode()->isShadowRoot()) {
+        if (!toShadowRoot(element->parentNode())->isOpen())
+            return nullptr;
+    }
+    return element->parentOrShadowHostElement();
+}
+
 SelectorChecker::Match SelectorChecker::matchForRelation(const SelectorCheckingContext& context, MatchResult& result) const
 {
     SelectorCheckingContext nextContext = prepareNextContextForRelation(context);
     nextContext.previousElement = context.element;
 
     CSSSelector::Relation relation = context.selector->relation();
 
     // Disable :visited matching when we see the first link or try to match anything else than an ancestors.
     if (!context.isSubSelector && (context.element->isLink() || (relation != CSSSelector::Descendant && relation != CSSSelector::Child)))
         nextContext.visitedMatchType = VisitedMatchDisabled;
@@ skipping 94 matching lines @@
     case CSSSelector::ShadowDeep:
         {
             if (!context.isUARule)
                 UseCounter::countDeprecation(context.element->document(), UseCounter::CSSDeepCombinator);
             if (ShadowRoot* root = context.element->containingShadowRoot()) {
                 if (root->type() == ShadowRootType::UserAgent)
                     return SelectorFailsCompletely;
             }
 
             if (context.selector->relationIsAffectedByPseudoContent()) {
+                // TODO(kochi): closed mode tree should be handled as well for ::content.

[kochi, 2015/08/20 06:04:26]

Added TODO for fixing this later.

                 for (Element* element = context.element; element; element = element->parentOrShadowHostElement()) {
                     if (matchForShadowDistributed(nextContext, *element, result) == SelectorMatches)
                         return SelectorMatches;
                 }
                 return SelectorFailsCompletely;
             }
 
             nextContext.isSubSelector = false;
             nextContext.inRightmostCompound = false;
-            for (nextContext.element = context.element->parentOrShadowHostElement(); nextContext.element; nextContext.element = nextContext.element->parentOrShadowHostElement()) {
+
+            for (nextContext.element = parentOrOpenShadowHostElement(context.element); nextContext.element; nextContext.element = parentOrOpenShadowHostElement(nextContext.element)) {
                 Match match = matchSelector(nextContext, result);
                 if (match == SelectorMatches || match == SelectorFailsCompletely)
                     return match;
                 if (nextSelectorExceedsScope(nextContext))
                     return SelectorFailsCompletely;
             }
             return SelectorFailsCompletely;
         }
 
     case CSSSelector::SubSelector:
@@ skipping 731 matching lines @@
 }
 
 bool SelectorChecker::matchesFocusPseudoClass(const Element& element)
 {
     if (InspectorInstrumentation::forcePseudoState(const_cast<Element*>(&element), CSSSelector::PseudoFocus))
         return true;
     return element.focused() && isFrameFocused(element);
 }
 
 }