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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 2004-2005 Allan Sandfeld Jensen (kde (at) carewolf.com)
      4  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit (at) nickshanks.com)
      5  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
      6  * Copyright (C) 2007 Alexey Proskuryakov <ap (at) webkit.org>
      7  * Copyright (C) 2007, 2008 Eric Seidel <eric (at) webkit.org>
      8  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
      9  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
     10  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
     11  * Copyright (C) 2012 Google Inc. All rights reserved.
     12  *
     13  * This library is free software; you can redistribute it and/or
     14  * modify it under the terms of the GNU Library General Public
     15  * License as published by the Free Software Foundation; either
     16  * version 2 of the License, or (at your option) any later version.
     17  *
     18  * This library is distributed in the hope that it will be useful,
     19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     21  * Library General Public License for more details.
     22  *
     23  * You should have received a copy of the GNU Library General Public License
     24  * along with this library; see the file COPYING.LIB.  If not, write to
     25  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     26  * Boston, MA 02110-1301, USA.
     27  */
     28 
     29 #include "config.h"
     30 #include "core/css/PageRuleCollector.h"
     31 
     32 #include "core/css/StylePropertySet.h"
     33 #include "core/css/StyleRule.h"
     34 #include "core/css/resolver/StyleResolverState.h"
     35 
     36 namespace WebCore {
     37 
     38 static inline bool comparePageRules(const StyleRulePage* r1, const StyleRulePage* r2)
     39 {
     40     return r1->selector()->specificity() < r2->selector()->specificity();
     41 }
     42 
     43 bool PageRuleCollector::isLeftPage(const RenderStyle* rootElementStyle, int pageIndex) const
     44 {
     45     bool isFirstPageLeft = false;
     46     ASSERT(rootElementStyle);
     47     if (!rootElementStyle->isLeftToRightDirection())
     48         isFirstPageLeft = true;
     49 
     50     return (pageIndex + (isFirstPageLeft ? 1 : 0)) % 2;
     51 }
     52 
     53 bool PageRuleCollector::isFirstPage(int pageIndex) const
     54 {
     55     // FIXME: In case of forced left/right page, page at index 1 (not 0) can be the first page.
     56     return (!pageIndex);
     57 }
     58 
     59 String PageRuleCollector::pageName(int /* pageIndex */) const
     60 {
     61     // FIXME: Implement page index to page name mapping.
     62     return "";
     63 }
     64 
     65 PageRuleCollector::PageRuleCollector(const RenderStyle* rootElementStyle, int pageIndex)
     66     : m_isLeftPage(isLeftPage(rootElementStyle, pageIndex))
     67     , m_isFirstPage(isFirstPage(pageIndex))
     68     , m_pageName(pageName(pageIndex)) { }
     69 
     70 void PageRuleCollector::matchPageRules(RuleSet* rules)
     71 {
     72     if (!rules)
     73         return;
     74 
     75     rules->compactRulesIfNeeded();
     76     Vector<StyleRulePage*> matchedPageRules;
     77     matchPageRulesForList(matchedPageRules, rules->pageRules(), m_isLeftPage, m_isFirstPage, m_pageName);
     78     if (matchedPageRules.isEmpty())
     79         return;
     80 
     81     std::stable_sort(matchedPageRules.begin(), matchedPageRules.end(), comparePageRules);
     82 
     83     for (unsigned i = 0; i < matchedPageRules.size(); i++)
     84         m_result.addMatchedProperties(matchedPageRules[i]->properties());
     85 }
     86 
     87 static bool checkPageSelectorComponents(const CSSSelector* selector, bool isLeftPage, bool isFirstPage, const String& pageName)
     88 {
     89     for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
     90         if (component->m_match == CSSSelector::Tag) {
     91             const AtomicString& localName = component->tagQName().localName();
     92             if (localName != starAtom && localName != pageName)
     93                 return false;
     94         }
     95 
     96         CSSSelector::PseudoType pseudoType = component->pseudoType();
     97         if ((pseudoType == CSSSelector::PseudoLeftPage && !isLeftPage)
     98             || (pseudoType == CSSSelector::PseudoRightPage && isLeftPage)
     99             || (pseudoType == CSSSelector::PseudoFirstPage && !isFirstPage))
    100         {
    101             return false;
    102         }
    103     }
    104     return true;
    105 }
    106 
    107 void PageRuleCollector::matchPageRulesForList(Vector<StyleRulePage*>& matchedRules, const Vector<StyleRulePage*>& rules, bool isLeftPage, bool isFirstPage, const String& pageName)
    108 {
    109     for (unsigned i = 0; i < rules.size(); ++i) {
    110         StyleRulePage* rule = rules[i];
    111 
    112         if (!checkPageSelectorComponents(rule->selector(), isLeftPage, isFirstPage, pageName))
    113             continue;
    114 
    115         // If the rule has no properties to apply, then ignore it.
    116         const StylePropertySet* properties = rule->properties();
    117         if (!properties || properties->isEmpty())
    118             continue;
    119 
    120         // Add this rule to our list of matched rules.
    121         matchedRules.append(rule);
    122     }
    123 }
    124 
    125 } // namespace WebCore
    126