| /* |
| * 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. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library 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 |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #include "sky/engine/core/css/SelectorChecker.h" |
| |
| #include "sky/engine/core/css/CSSSelector.h" |
| #include "sky/engine/core/css/CSSSelectorList.h" |
| #include "sky/engine/core/dom/Document.h" |
| #include "sky/engine/core/frame/LocalFrame.h" |
| #include "sky/engine/core/html/parser/HTMLParserIdioms.h" |
| #include "sky/engine/core/rendering/style/RenderStyle.h" |
| |
| namespace blink { |
| |
| SelectorChecker::SelectorChecker(const Element& element) |
| : m_element(element) |
| , m_matchedAttributeSelector(false) |
| , m_matchedHoverSelector(false) |
| , m_matchedActiveSelector(false) |
| { |
| } |
| |
| bool SelectorChecker::match(const CSSSelector& selector) |
| { |
| const CSSSelector* current = &selector; |
| |
| do { |
| if (!checkOne(*current)) |
| return false; |
| current = current->tagHistory(); |
| } while (current); |
| |
| return true; |
| } |
| |
| static bool anyAttributeMatches(const Element& element, CSSSelector::Match match, const CSSSelector& selector) |
| { |
| const QualifiedName& selectorAttr = selector.attribute(); |
| ASSERT(selectorAttr.localName() != starAtom); // Should not be possible from the CSS grammar. |
| |
| if (match == CSSSelector::Set) |
| return element.hasAttribute(selectorAttr); |
| |
| ASSERT(match == CSSSelector::Exact); |
| |
| const AtomicString& selectorValue = selector.value(); |
| const AtomicString& value = element.getAttribute(selectorAttr); |
| |
| if (value.isNull()) |
| return false; |
| if (selector.attributeMatchType() == CSSSelector::CaseInsensitive) |
| return equalIgnoringCase(selectorValue, value); |
| return selectorValue == value; |
| } |
| |
| bool SelectorChecker::checkOne(const CSSSelector& selector) |
| { |
| switch (selector.match()) { |
| case CSSSelector::Tag: |
| { |
| const AtomicString& localName = selector.tagQName().localName(); |
| return localName == starAtom || localName == m_element.localName(); |
| } |
| case CSSSelector::Class: |
| return m_element.hasClass() && m_element.classNames().contains(selector.value()); |
| case CSSSelector::Id: |
| return m_element.hasID() && m_element.idForStyleResolution() == selector.value(); |
| case CSSSelector::Exact: |
| case CSSSelector::Set: |
| if (anyAttributeMatches(m_element, selector.match(), selector)) { |
| m_matchedAttributeSelector = true; |
| return true; |
| } |
| return false; |
| case CSSSelector::PseudoClass: |
| return checkPseudoClass(selector); |
| // FIXME(sky): Remove pseudo elements completely. |
| case CSSSelector::PseudoElement: |
| case CSSSelector::Unknown: |
| return false; |
| } |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| bool SelectorChecker::checkPseudoClass(const CSSSelector& selector) |
| { |
| switch (selector.pseudoType()) { |
| case CSSSelector::PseudoHover: |
| m_matchedHoverSelector = true; |
| return m_element.hovered(); |
| |
| case CSSSelector::PseudoActive: |
| m_matchedActiveSelector = true; |
| return m_element.active(); |
| |
| case CSSSelector::PseudoLang: |
| { |
| AtomicString value = m_element.computeInheritedLanguage(); |
| const AtomicString& argument = selector.argument(); |
| if (value.isEmpty() || !value.startsWith(argument, false)) |
| break; |
| if (value.length() != argument.length() && value[argument.length()] != '-') |
| break; |
| return true; |
| } |
| |
| case CSSSelector::PseudoHost: |
| { |
| // We can only get here if the selector was defined in the right |
| // scope so we don't need to check it. |
| |
| // For empty parameter case, i.e. just :host or :host(). |
| if (!selector.selectorList()) |
| return true; |
| for (const CSSSelector* current = selector.selectorList()->first(); current; current = CSSSelectorList::next(*current)) { |
| if (match(*current)) |
| return true; |
| } |
| return false; |
| } |
| |
| case CSSSelector::PseudoUnknown: |
| case CSSSelector::PseudoNotParsed: |
| return false; |
| } |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| } |