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/*
* 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.
* Copyright (C) 2012 Google Inc. 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 "third_party/blink/renderer/core/css/page_rule_collector.h"
#include <algorithm>
#include "third_party/blink/renderer/core/css/css_property_value_set.h"
#include "third_party/blink/renderer/core/css/style_rule.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
namespace blink {
static inline bool ComparePageRules(const StyleRulePage* r1,
const StyleRulePage* r2) {
return r1->Selector()->Specificity() < r2->Selector()->Specificity();
}
bool PageRuleCollector::IsLeftPage(const ComputedStyle* root_element_style,
int page_index) const {
bool is_first_page_left = false;
DCHECK(root_element_style);
if (!root_element_style->IsLeftToRightDirection())
is_first_page_left = true;
return (page_index + (is_first_page_left ? 1 : 0)) % 2;
}
bool PageRuleCollector::IsFirstPage(int page_index) const {
// FIXME: In case of forced left/right page, page at index 1 (not 0) can be
// the first page.
return (!page_index);
}
String PageRuleCollector::PageName(int /* pageIndex */) const {
// FIXME: Implement page index to page name mapping.
return "";
}
PageRuleCollector::PageRuleCollector(const ComputedStyle* root_element_style,
int page_index,
MatchResult& match_result)
: is_left_page_(IsLeftPage(root_element_style, page_index)),
is_first_page_(IsFirstPage(page_index)),
page_name_(PageName(page_index)),
result_(match_result) {}
void PageRuleCollector::MatchPageRules(RuleSet* rules) {
if (!rules)
return;
rules->CompactRulesIfNeeded();
HeapVector<Member<StyleRulePage>> matched_page_rules;
MatchPageRulesForList(matched_page_rules, rules->PageRules(), is_left_page_,
is_first_page_, page_name_);
if (matched_page_rules.IsEmpty())
return;
std::stable_sort(matched_page_rules.begin(), matched_page_rules.end(),
ComparePageRules);
for (unsigned i = 0; i < matched_page_rules.size(); i++)
result_.AddMatchedProperties(&matched_page_rules[i]->Properties());
}
static bool CheckPageSelectorComponents(const CSSSelector* selector,
bool is_left_page,
bool is_first_page,
const String& page_name) {
for (const CSSSelector* component = selector; component;
component = component->TagHistory()) {
if (component->Match() == CSSSelector::kTag) {
const AtomicString& local_name = component->TagQName().LocalName();
DCHECK_NE(local_name, CSSSelector::UniversalSelectorAtom());
if (local_name != page_name)
return false;
}
CSSSelector::PseudoType pseudo_type = component->GetPseudoType();
if ((pseudo_type == CSSSelector::kPseudoLeftPage && !is_left_page) ||
(pseudo_type == CSSSelector::kPseudoRightPage && is_left_page) ||
(pseudo_type == CSSSelector::kPseudoFirstPage && !is_first_page)) {
return false;
}
}
return true;
}
void PageRuleCollector::MatchPageRulesForList(
HeapVector<Member<StyleRulePage>>& matched_rules,
const HeapVector<Member<StyleRulePage>>& rules,
bool is_left_page,
bool is_first_page,
const String& page_name) {
for (unsigned i = 0; i < rules.size(); ++i) {
StyleRulePage* rule = rules[i];
if (!CheckPageSelectorComponents(rule->Selector(), is_left_page,
is_first_page, page_name))
continue;
// If the rule has no properties to apply, then ignore it.
const CSSPropertyValueSet& properties = rule->Properties();
if (properties.IsEmpty())
continue;
// Add this rule to our list of matched rules.
matched_rules.push_back(rule);
}
}
} // namespace blink
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