1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
4 * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@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@webkit.org>
7 * Copyright (C) 2007, 2008 Eric Seidel <eric@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 "PageRuleCollector.h"
31
32#include "CSSDefaultStyleSheets.h"
33#include "StyleProperties.h"
34#include "StyleRule.h"
35
36namespace WebCore {
37
38static inline bool comparePageRules(const StyleRulePage* r1, const StyleRulePage* r2)
39{
40 return r1->selector()->specificityForPage() < r2->selector()->specificityForPage();
41}
42
43bool PageRuleCollector::isLeftPage(int pageIndex) const
44{
45 bool isFirstPageLeft = false;
46 if (!m_state.rootElementStyle()->isLeftToRightDirection())
47 isFirstPageLeft = true;
48
49 return (pageIndex + (isFirstPageLeft ? 1 : 0)) % 2;
50}
51
52bool PageRuleCollector::isFirstPage(int pageIndex) const
53{
54 // FIXME: In case of forced left/right page, page at index 1 (not 0) can be the first page.
55 return (!pageIndex);
56}
57
58String PageRuleCollector::pageName(int /* pageIndex */) const
59{
60 // FIXME: Implement page index to page name mapping.
61 return emptyString();
62}
63
64void PageRuleCollector::matchAllPageRules(int pageIndex)
65{
66 const bool isLeft = isLeftPage(pageIndex);
67 const bool isFirst = isFirstPage(pageIndex);
68 const String page = pageName(pageIndex);
69
70 matchPageRules(CSSDefaultStyleSheets::defaultPrintStyle, isLeft, isFirst, page);
71 matchPageRules(m_ruleSets.userStyle(), isLeft, isFirst, page);
72 // Only consider the global author RuleSet for @page rules, as per the HTML5 spec.
73 if (m_ruleSets.isAuthorStyleDefined())
74 matchPageRules(&m_ruleSets.authorStyle(), isLeft, isFirst, page);
75}
76
77void PageRuleCollector::matchPageRules(RuleSet* rules, bool isLeftPage, bool isFirstPage, const String& pageName)
78{
79 if (!rules)
80 return;
81
82 Vector<StyleRulePage*> matchedPageRules;
83 matchPageRulesForList(matchedPageRules, rules->pageRules(), isLeftPage, isFirstPage, pageName);
84 if (matchedPageRules.isEmpty())
85 return;
86
87 std::stable_sort(matchedPageRules.begin(), matchedPageRules.end(), comparePageRules);
88
89 for (unsigned i = 0; i < matchedPageRules.size(); i++)
90 m_result.addMatchedProperties(matchedPageRules[i]->properties());
91}
92
93static bool checkPageSelectorComponents(const CSSSelector* selector, bool isLeftPage, bool isFirstPage, const String& pageName)
94{
95 for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
96 if (component->match() == CSSSelector::Tag) {
97 const AtomicString& localName = component->tagQName().localName();
98 if (localName != starAtom() && localName != pageName)
99 return false;
100 } else if (component->match() == CSSSelector::PagePseudoClass) {
101 CSSSelector::PagePseudoClassType pseudoType = component->pagePseudoClassType();
102 if ((pseudoType == CSSSelector::PagePseudoClassLeft && !isLeftPage)
103 || (pseudoType == CSSSelector::PagePseudoClassRight && isLeftPage)
104 || (pseudoType == CSSSelector::PagePseudoClassFirst && !isFirstPage))
105 {
106 return false;
107 }
108 }
109 }
110 return true;
111}
112
113void PageRuleCollector::matchPageRulesForList(Vector<StyleRulePage*>& matchedRules, const Vector<StyleRulePage*>& rules, bool isLeftPage, bool isFirstPage, const String& pageName)
114{
115 for (unsigned i = 0; i < rules.size(); ++i) {
116 StyleRulePage* rule = rules[i];
117
118 if (!checkPageSelectorComponents(rule->selector(), isLeftPage, isFirstPage, pageName))
119 continue;
120
121 // If the rule has no properties to apply, then ignore it.
122 const StyleProperties& properties = rule->properties();
123 if (properties.isEmpty())
124 continue;
125
126 // Add this rule to our list of matched rules.
127 matchedRules.append(rule);
128 }
129}
130
131} // namespace WebCore
132