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 "StylePropertySet.h"
34#include "StyleRule.h"
35
36namespace WebCore {
37
38static inline bool comparePageRules(const StyleRulePage* r1, const StyleRulePage* r2)
39{
40    return r1->selector()->specificity() < r2->selector()->specificity();
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 "";
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    matchPageRules(m_ruleSets.authorStyle(), isLeft, isFirst, page);
74}
75
76void PageRuleCollector::matchPageRules(RuleSet* rules, bool isLeftPage, bool isFirstPage, const String& pageName)
77{
78    if (!rules)
79        return;
80
81    Vector<StyleRulePage*> matchedPageRules;
82    matchPageRulesForList(matchedPageRules, rules->pageRules(), isLeftPage, isFirstPage, pageName);
83    if (matchedPageRules.isEmpty())
84        return;
85
86    std::stable_sort(matchedPageRules.begin(), matchedPageRules.end(), comparePageRules);
87
88    for (unsigned i = 0; i < matchedPageRules.size(); i++)
89        m_result.addMatchedProperties(matchedPageRules[i]->properties());
90}
91
92static bool checkPageSelectorComponents(const CSSSelector* selector, bool isLeftPage, bool isFirstPage, const String& pageName)
93{
94    for (const CSSSelector* component = selector; component; component = component->tagHistory()) {
95        if (component->m_match == CSSSelector::Tag) {
96            const AtomicString& localName = component->tagQName().localName();
97            if (localName != starAtom && localName != pageName)
98                return false;
99        }
100
101        CSSSelector::PseudoType pseudoType = component->pseudoType();
102        if ((pseudoType == CSSSelector::PseudoLeftPage && !isLeftPage)
103            || (pseudoType == CSSSelector::PseudoRightPage && isLeftPage)
104            || (pseudoType == CSSSelector::PseudoFirstPage && !isFirstPage))
105        {
106            return false;
107        }
108    }
109    return true;
110}
111
112void PageRuleCollector::matchPageRulesForList(Vector<StyleRulePage*>& matchedRules, const Vector<StyleRulePage*>& rules, bool isLeftPage, bool isFirstPage, const String& pageName)
113{
114    for (unsigned i = 0; i < rules.size(); ++i) {
115        StyleRulePage* rule = rules[i];
116
117        if (!checkPageSelectorComponents(rule->selector(), isLeftPage, isFirstPage, pageName))
118            continue;
119
120        // If the rule has no properties to apply, then ignore it.
121        const StylePropertySet* properties = rule->properties();
122        if (!properties || properties->isEmpty())
123            continue;
124
125        // Add this rule to our list of matched rules.
126        matchedRules.append(rule);
127    }
128}
129
130} // namespace WebCore
131