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/*
* Copyright (C) 2012, 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "StyleInvalidationAnalysis.h"
#include "CSSSelectorList.h"
#include "Document.h"
#include "ElementIterator.h"
#include "ElementRuleCollector.h"
#include "SelectorFilter.h"
#include "ShadowRoot.h"
#include "StyleRuleImport.h"
#include "StyleSheetContents.h"
namespace WebCore {
static bool shouldDirtyAllStyle(const Vector<RefPtr<StyleRuleBase>>& rules)
{
for (auto& rule : rules) {
if (is<StyleRuleMedia>(*rule)) {
if (shouldDirtyAllStyle(downcast<StyleRuleMedia>(*rule).childRules()))
return true;
continue;
}
// FIXME: At least font faces don't need full recalc in all cases.
if (!is<StyleRule>(*rule))
return true;
}
return false;
}
static bool shouldDirtyAllStyle(const StyleSheetContents& sheet)
{
for (auto& import : sheet.importRules()) {
if (!import->styleSheet())
continue;
if (shouldDirtyAllStyle(*import->styleSheet()))
return true;
}
if (shouldDirtyAllStyle(sheet.childRules()))
return true;
return false;
}
static bool shouldDirtyAllStyle(const Vector<StyleSheetContents*>& sheets)
{
for (auto& sheet : sheets) {
if (shouldDirtyAllStyle(*sheet))
return true;
}
return false;
}
StyleInvalidationAnalysis::StyleInvalidationAnalysis(const Vector<StyleSheetContents*>& sheets, const MediaQueryEvaluator& mediaQueryEvaluator)
: m_ownedRuleSet(std::make_unique<RuleSet>())
, m_ruleSet(*m_ownedRuleSet)
, m_dirtiesAllStyle(shouldDirtyAllStyle(sheets))
{
if (m_dirtiesAllStyle)
return;
m_ownedRuleSet->disableAutoShrinkToFit();
for (auto& sheet : sheets)
m_ownedRuleSet->addRulesFromSheet(*sheet, mediaQueryEvaluator);
m_hasShadowPseudoElementRulesInAuthorSheet = m_ruleSet.hasShadowPseudoElementRules();
}
StyleInvalidationAnalysis::StyleInvalidationAnalysis(const RuleSet& ruleSet)
: m_ruleSet(ruleSet)
, m_hasShadowPseudoElementRulesInAuthorSheet(ruleSet.hasShadowPseudoElementRules())
{
}
StyleInvalidationAnalysis::CheckDescendants StyleInvalidationAnalysis::invalidateIfNeeded(Element& element, const SelectorFilter* filter)
{
if (m_hasShadowPseudoElementRulesInAuthorSheet) {
// FIXME: This could do actual rule matching too.
if (element.shadowRoot())
element.setNeedsStyleRecalc();
}
switch (element.styleChangeType()) {
case NoStyleChange: {
ElementRuleCollector ruleCollector(element, m_ruleSet, filter);
ruleCollector.setMode(SelectorChecker::Mode::CollectingRulesIgnoringVirtualPseudoElements);
ruleCollector.matchAuthorRules(false);
if (ruleCollector.hasMatchedRules())
element.setNeedsStyleRecalc(InlineStyleChange);
return CheckDescendants::Yes;
}
case InlineStyleChange:
return CheckDescendants::Yes;
case FullStyleChange:
case SyntheticStyleChange:
case ReconstructRenderTree:
return CheckDescendants::No;
}
ASSERT_NOT_REACHED();
return CheckDescendants::Yes;
}
void StyleInvalidationAnalysis::invalidateStyleForTree(Element& root, SelectorFilter* filter)
{
if (invalidateIfNeeded(root, filter) == CheckDescendants::No)
return;
Vector<Element*, 20> parentStack;
Element* previousElement = &root;
auto descendants = descendantsOfType<Element>(root);
for (auto it = descendants.begin(), end = descendants.end(); it != end;) {
auto& descendant = *it;
auto* parent = descendant.parentElement();
if (parentStack.isEmpty() || parentStack.last() != parent) {
if (parent == previousElement) {
parentStack.append(parent);
if (filter)
filter->pushParent(parent);
} else {
while (parentStack.last() != parent) {
parentStack.removeLast();
if (filter)
filter->popParent();
}
}
}
previousElement = &descendant;
if (invalidateIfNeeded(descendant, filter) == CheckDescendants::Yes)
it.traverseNext();
else
it.traverseNextSkippingChildren();
}
}
void StyleInvalidationAnalysis::invalidateStyle(Document& document)
{
ASSERT(!m_dirtiesAllStyle);
Element* documentElement = document.documentElement();
if (!documentElement)
return;
SelectorFilter filter;
invalidateStyleForTree(*documentElement, &filter);
}
void StyleInvalidationAnalysis::invalidateStyle(Element& element)
{
ASSERT(!m_dirtiesAllStyle);
// Don't use SelectorFilter as the rule sets here tend to be small and the filter would have setup cost deep in the tree.
invalidateStyleForTree(element, nullptr);
}
}
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