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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* (C) 2006 Alexey Proskuryakov (ap@webkit.org)
* Copyright (C) 2004-2009, 2011-2012, 2015-2017 Apple Inc. All rights reserved.
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) Research In Motion Limited 2010-2011. 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 "config.h"
#include "StyleScope.h"
#include "CSSFontSelector.h"
#include "CSSStyleSheet.h"
#include "Element.h"
#include "ElementChildIterator.h"
#include "ExtensionStyleSheets.h"
#include "HTMLHeadElement.h"
#include "HTMLIFrameElement.h"
#include "HTMLLinkElement.h"
#include "HTMLSlotElement.h"
#include "HTMLStyleElement.h"
#include "InspectorInstrumentation.h"
#include "ProcessingInstruction.h"
#include "SVGStyleElement.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "StyleInvalidator.h"
#include "StyleResolver.h"
#include "StyleSheetContents.h"
#include "StyleSheetList.h"
#include "UserContentController.h"
#include "UserContentURLPattern.h"
#include "UserStyleSheet.h"
#include <wtf/SetForScope.h>
namespace WebCore {
using namespace HTMLNames;
namespace Style {
Scope::Scope(Document& document)
: m_document(document)
, m_pendingUpdateTimer(*this, &Scope::pendingUpdateTimerFired)
{
}
Scope::Scope(ShadowRoot& shadowRoot)
: m_document(shadowRoot.documentScope())
, m_shadowRoot(&shadowRoot)
, m_pendingUpdateTimer(*this, &Scope::pendingUpdateTimerFired)
{
}
Scope::~Scope()
{
ASSERT(!hasPendingSheets());
}
bool Scope::shouldUseSharedUserAgentShadowTreeStyleResolver() const
{
if (!m_shadowRoot)
return false;
if (m_shadowRoot->mode() != ShadowRootMode::UserAgent)
return false;
// If we have stylesheets in the user agent shadow tree use per-scope resolver.
if (!m_styleSheetCandidateNodes.isEmpty())
return false;
return true;
}
StyleResolver& Scope::resolver()
{
if (shouldUseSharedUserAgentShadowTreeStyleResolver())
return m_document.userAgentShadowTreeStyleResolver();
if (!m_resolver) {
SetForScope<bool> isUpdatingStyleResolver { m_isUpdatingStyleResolver, true };
m_resolver = std::make_unique<StyleResolver>(m_document);
if (!m_shadowRoot) {
m_document.fontSelector().buildStarted();
m_resolver->ruleSets().initializeUserStyle();
} else {
m_resolver->ruleSets().setIsForShadowScope();
m_resolver->ruleSets().setUsesSharedUserStyle(m_shadowRoot->mode() != ShadowRootMode::UserAgent);
}
m_resolver->addCurrentSVGFontFaceRules();
m_resolver->appendAuthorStyleSheets(m_activeStyleSheets);
if (!m_shadowRoot)
m_document.fontSelector().buildCompleted();
}
ASSERT(!m_shadowRoot || &m_document == &m_shadowRoot->document());
ASSERT(&m_resolver->document() == &m_document);
return *m_resolver;
}
StyleResolver* Scope::resolverIfExists()
{
if (shouldUseSharedUserAgentShadowTreeStyleResolver())
return &m_document.userAgentShadowTreeStyleResolver();
return m_resolver.get();
}
void Scope::clearResolver()
{
m_resolver = nullptr;
if (!m_shadowRoot)
m_document.didClearStyleResolver();
}
void Scope::releaseMemory()
{
if (!m_shadowRoot) {
for (auto* descendantShadowRoot : m_document.inDocumentShadowRoots())
descendantShadowRoot->styleScope().releaseMemory();
}
#if ENABLE(CSS_SELECTOR_JIT)
for (auto& sheet : m_activeStyleSheets) {
sheet->contents().traverseRules([] (const StyleRuleBase& rule) {
if (is<StyleRule>(rule))
downcast<StyleRule>(rule).releaseCompiledSelectors();
return false;
});
}
#endif
clearResolver();
}
Scope& Scope::forNode(Node& node)
{
ASSERT(node.isConnected());
auto* shadowRoot = node.containingShadowRoot();
if (shadowRoot)
return shadowRoot->styleScope();
return node.document().styleScope();
}
Scope* Scope::forOrdinal(Element& element, ScopeOrdinal ordinal)
{
switch (ordinal) {
case ScopeOrdinal::Element:
return &forNode(element);
case ScopeOrdinal::ContainingHost: {
auto* containingShadowRoot = element.containingShadowRoot();
if (!containingShadowRoot)
return nullptr;
return &forNode(*containingShadowRoot->host());
}
case ScopeOrdinal::Shadow: {
auto* shadowRoot = element.shadowRoot();
if (!shadowRoot)
return nullptr;
return &shadowRoot->styleScope();
}
default: {
ASSERT(ordinal >= ScopeOrdinal::FirstSlot);
auto slotIndex = ScopeOrdinal::FirstSlot;
for (auto* slot = element.assignedSlot(); slot; slot = slot->assignedSlot(), ++slotIndex) {
if (slotIndex == ordinal)
return &forNode(*slot);
}
return nullptr;
}
}
}
void Scope::setPreferredStylesheetSetName(const String& name)
{
if (m_preferredStylesheetSetName == name)
return;
m_preferredStylesheetSetName = name;
didChangeActiveStyleSheetCandidates();
}
void Scope::addPendingSheet(const Element& element)
{
ASSERT(!hasPendingSheet(element));
bool isInHead = ancestorsOfType<HTMLHeadElement>(element).first();
if (isInHead)
m_elementsInHeadWithPendingSheets.add(&element);
else
m_elementsInBodyWithPendingSheets.add(&element);
}
// This method is called whenever a top-level stylesheet has finished loading.
void Scope::removePendingSheet(const Element& element)
{
ASSERT(hasPendingSheet(element));
if (!m_elementsInHeadWithPendingSheets.remove(&element))
m_elementsInBodyWithPendingSheets.remove(&element);
didRemovePendingStylesheet();
}
void Scope::addPendingSheet(const ProcessingInstruction& processingInstruction)
{
ASSERT(!m_processingInstructionsWithPendingSheets.contains(&processingInstruction));
m_processingInstructionsWithPendingSheets.add(&processingInstruction);
}
void Scope::removePendingSheet(const ProcessingInstruction& processingInstruction)
{
ASSERT(m_processingInstructionsWithPendingSheets.contains(&processingInstruction));
m_processingInstructionsWithPendingSheets.remove(&processingInstruction);
didRemovePendingStylesheet();
}
void Scope::didRemovePendingStylesheet()
{
if (hasPendingSheets())
return;
didChangeActiveStyleSheetCandidates();
if (!m_shadowRoot)
m_document.didRemoveAllPendingStylesheet();
}
bool Scope::hasPendingSheet(const Element& element) const
{
return m_elementsInHeadWithPendingSheets.contains(&element) || hasPendingSheetInBody(element);
}
bool Scope::hasPendingSheetInBody(const Element& element) const
{
return m_elementsInBodyWithPendingSheets.contains(&element);
}
bool Scope::hasPendingSheet(const ProcessingInstruction& processingInstruction) const
{
return m_processingInstructionsWithPendingSheets.contains(&processingInstruction);
}
void Scope::addStyleSheetCandidateNode(Node& node, bool createdByParser)
{
if (!node.isConnected())
return;
// Until the <body> exists, we have no choice but to compare document positions,
// since styles outside of the body and head continue to be shunted into the head
// (and thus can shift to end up before dynamically added DOM content that is also
// outside the body).
if ((createdByParser && m_document.bodyOrFrameset()) || m_styleSheetCandidateNodes.isEmpty()) {
m_styleSheetCandidateNodes.add(&node);
return;
}
// Determine an appropriate insertion point.
auto begin = m_styleSheetCandidateNodes.begin();
auto end = m_styleSheetCandidateNodes.end();
auto it = end;
Node* followingNode = nullptr;
do {
--it;
Node* n = *it;
unsigned short position = n->compareDocumentPosition(node);
if (position == Node::DOCUMENT_POSITION_FOLLOWING) {
m_styleSheetCandidateNodes.insertBefore(followingNode, &node);
return;
}
followingNode = n;
} while (it != begin);
m_styleSheetCandidateNodes.insertBefore(followingNode, &node);
}
void Scope::removeStyleSheetCandidateNode(Node& node)
{
if (m_styleSheetCandidateNodes.remove(&node))
didChangeActiveStyleSheetCandidates();
}
#if ENABLE(XSLT)
// FIXME: <https://webkit.org/b/178830> Remove XSLT relaed code from Style::Scope.
Vector<Ref<ProcessingInstruction>> Scope::collectXSLTransforms()
{
Vector<Ref<ProcessingInstruction>> processingInstructions;
for (auto& node : m_styleSheetCandidateNodes) {
if (is<ProcessingInstruction>(*node) && downcast<ProcessingInstruction>(*node).isXSL())
processingInstructions.append(downcast<ProcessingInstruction>(*node));
}
return processingInstructions;
}
#endif
void Scope::collectActiveStyleSheets(Vector<RefPtr<StyleSheet>>& sheets)
{
if (!m_document.settings().authorAndUserStylesEnabled())
return;
for (auto& node : m_styleSheetCandidateNodes) {
RefPtr<StyleSheet> sheet;
if (is<ProcessingInstruction>(*node)) {
if (!downcast<ProcessingInstruction>(*node).isCSS())
continue;
// We don't support linking to embedded CSS stylesheets, see <https://bugs.webkit.org/show_bug.cgi?id=49281> for discussion.
sheet = downcast<ProcessingInstruction>(*node).sheet();
} else if (is<HTMLLinkElement>(*node) || is<HTMLStyleElement>(*node) || is<SVGStyleElement>(*node)) {
Element& element = downcast<Element>(*node);
AtomString title = element.isInShadowTree() ? nullAtom() : element.attributeWithoutSynchronization(titleAttr);
bool enabledViaScript = false;
if (is<HTMLLinkElement>(element)) {
// <LINK> element
HTMLLinkElement& linkElement = downcast<HTMLLinkElement>(element);
if (linkElement.isDisabled())
continue;
enabledViaScript = linkElement.isEnabledViaScript();
if (linkElement.styleSheetIsLoading()) {
// it is loading but we should still decide which style sheet set to use
if (!enabledViaScript && !title.isEmpty() && m_preferredStylesheetSetName.isEmpty()) {
if (!linkElement.attributeWithoutSynchronization(relAttr).contains("alternate"))
m_preferredStylesheetSetName = title;
}
continue;
}
if (!linkElement.sheet())
title = nullAtom();
}
// Get the current preferred styleset. This is the
// set of sheets that will be enabled.
if (is<SVGStyleElement>(element))
sheet = downcast<SVGStyleElement>(element).sheet();
else if (is<HTMLLinkElement>(element))
sheet = downcast<HTMLLinkElement>(element).sheet();
else
sheet = downcast<HTMLStyleElement>(element).sheet();
// Check to see if this sheet belongs to a styleset
// (thus making it PREFERRED or ALTERNATE rather than
// PERSISTENT).
auto& rel = element.attributeWithoutSynchronization(relAttr);
if (!enabledViaScript && !title.isEmpty()) {
// Yes, we have a title.
if (m_preferredStylesheetSetName.isEmpty()) {
// No preferred set has been established. If
// we are NOT an alternate sheet, then establish
// us as the preferred set. Otherwise, just ignore
// this sheet.
if (is<HTMLStyleElement>(element) || !rel.contains("alternate"))
m_preferredStylesheetSetName = title;
}
if (title != m_preferredStylesheetSetName)
sheet = nullptr;
}
if (rel.contains("alternate") && title.isEmpty())
sheet = nullptr;
}
if (sheet)
sheets.append(WTFMove(sheet));
}
}
Scope::StyleResolverUpdateType Scope::analyzeStyleSheetChange(const Vector<RefPtr<CSSStyleSheet>>& newStylesheets, bool& requiresFullStyleRecalc)
{
requiresFullStyleRecalc = true;
unsigned newStylesheetCount = newStylesheets.size();
if (!resolverIfExists())
return Reconstruct;
auto& styleResolver = *resolverIfExists();
// Find out which stylesheets are new.
unsigned oldStylesheetCount = m_activeStyleSheets.size();
if (newStylesheetCount < oldStylesheetCount)
return Reconstruct;
Vector<StyleSheetContents*> addedSheets;
unsigned newIndex = 0;
for (unsigned oldIndex = 0; oldIndex < oldStylesheetCount; ++oldIndex) {
if (newIndex >= newStylesheetCount)
return Reconstruct;
while (m_activeStyleSheets[oldIndex] != newStylesheets[newIndex]) {
addedSheets.append(&newStylesheets[newIndex]->contents());
++newIndex;
if (newIndex == newStylesheetCount)
return Reconstruct;
}
++newIndex;
}
bool hasInsertions = !addedSheets.isEmpty();
while (newIndex < newStylesheetCount) {
addedSheets.append(&newStylesheets[newIndex]->contents());
++newIndex;
}
// If all new sheets were added at the end of the list we can just add them to existing StyleResolver.
// If there were insertions we need to re-add all the stylesheets so rules are ordered correctly.
auto styleResolverUpdateType = hasInsertions ? Reset : Additive;
// If we are already parsing the body and so may have significant amount of elements, put some effort into trying to avoid style recalcs.
if (!m_document.bodyOrFrameset() || m_document.hasNodesWithNonFinalStyle() || m_document.hasNodesWithMissingStyle())
return styleResolverUpdateType;
Invalidator invalidator(addedSheets, styleResolver.mediaQueryEvaluator());
if (invalidator.dirtiesAllStyle())
return styleResolverUpdateType;
if (m_shadowRoot)
invalidator.invalidateStyle(*m_shadowRoot);
else
invalidator.invalidateStyle(m_document);
requiresFullStyleRecalc = false;
return styleResolverUpdateType;
}
static void filterEnabledNonemptyCSSStyleSheets(Vector<RefPtr<CSSStyleSheet>>& result, const Vector<RefPtr<StyleSheet>>& sheets)
{
for (auto& sheet : sheets) {
if (!is<CSSStyleSheet>(*sheet))
continue;
CSSStyleSheet& styleSheet = downcast<CSSStyleSheet>(*sheet);
if (styleSheet.isLoading())
continue;
if (styleSheet.disabled())
continue;
if (!styleSheet.length())
continue;
result.append(&styleSheet);
}
}
static void invalidateHostAndSlottedStyleIfNeeded(ShadowRoot& shadowRoot, StyleResolver& resolver)
{
auto& host = *shadowRoot.host();
if (!resolver.ruleSets().authorStyle().hostPseudoClassRules().isEmpty())
host.invalidateStyle();
if (!resolver.ruleSets().authorStyle().slottedPseudoElementRules().isEmpty()) {
for (auto& shadowChild : childrenOfType<Element>(host))
shadowChild.invalidateStyle();
}
}
void Scope::updateActiveStyleSheets(UpdateType updateType)
{
ASSERT(!m_pendingUpdate);
if (!m_document.hasLivingRenderTree())
return;
if (m_document.inStyleRecalc() || m_document.inRenderTreeUpdate()) {
// Protect against deleting style resolver in the middle of a style resolution.
// Crash stacks indicate we can get here when a resource load fails synchronously (for example due to content blocking).
// FIXME: These kind of cases should be eliminated and this path replaced by an assert.
m_pendingUpdate = UpdateType::ContentsOrInterpretation;
m_document.scheduleFullStyleRebuild();
return;
}
Vector<RefPtr<StyleSheet>> activeStyleSheets;
collectActiveStyleSheets(activeStyleSheets);
Vector<RefPtr<CSSStyleSheet>> activeCSSStyleSheets;
activeCSSStyleSheets.appendVector(m_document.extensionStyleSheets().injectedAuthorStyleSheets());
activeCSSStyleSheets.appendVector(m_document.extensionStyleSheets().authorStyleSheetsForTesting());
filterEnabledNonemptyCSSStyleSheets(activeCSSStyleSheets, activeStyleSheets);
bool requiresFullStyleRecalc = true;
StyleResolverUpdateType styleResolverUpdateType = Reconstruct;
if (updateType == UpdateType::ActiveSet)
styleResolverUpdateType = analyzeStyleSheetChange(activeCSSStyleSheets, requiresFullStyleRecalc);
updateStyleResolver(activeCSSStyleSheets, styleResolverUpdateType);
m_weakCopyOfActiveStyleSheetListForFastLookup = nullptr;
m_activeStyleSheets.swap(activeCSSStyleSheets);
m_styleSheetsForStyleSheetList.swap(activeStyleSheets);
InspectorInstrumentation::activeStyleSheetsUpdated(m_document);
for (const auto& sheet : m_activeStyleSheets) {
if (sheet->contents().usesStyleBasedEditability())
m_usesStyleBasedEditability = true;
}
// FIXME: Move this code somewhere else.
if (requiresFullStyleRecalc) {
if (m_shadowRoot) {
for (auto& shadowChild : childrenOfType<Element>(*m_shadowRoot))
shadowChild.invalidateStyleForSubtree();
invalidateHostAndSlottedStyleIfNeeded(*m_shadowRoot, resolver());
} else
m_document.scheduleFullStyleRebuild();
}
}
void Scope::updateStyleResolver(Vector<RefPtr<CSSStyleSheet>>& activeStyleSheets, StyleResolverUpdateType updateType)
{
if (updateType == Reconstruct) {
clearResolver();
return;
}
auto& styleResolver = resolver();
SetForScope<bool> isUpdatingStyleResolver { m_isUpdatingStyleResolver, true };
if (updateType == Reset) {
styleResolver.ruleSets().resetAuthorStyle();
styleResolver.appendAuthorStyleSheets(activeStyleSheets);
} else {
ASSERT(updateType == Additive);
unsigned firstNewIndex = m_activeStyleSheets.size();
Vector<RefPtr<CSSStyleSheet>> newStyleSheets;
newStyleSheets.appendRange(activeStyleSheets.begin() + firstNewIndex, activeStyleSheets.end());
styleResolver.appendAuthorStyleSheets(newStyleSheets);
}
}
const Vector<RefPtr<CSSStyleSheet>> Scope::activeStyleSheetsForInspector()
{
Vector<RefPtr<CSSStyleSheet>> result;
result.appendVector(m_document.extensionStyleSheets().injectedAuthorStyleSheets());
result.appendVector(m_document.extensionStyleSheets().authorStyleSheetsForTesting());
for (auto& styleSheet : m_styleSheetsForStyleSheetList) {
if (!is<CSSStyleSheet>(*styleSheet))
continue;
CSSStyleSheet& sheet = downcast<CSSStyleSheet>(*styleSheet);
if (sheet.disabled())
continue;
result.append(&sheet);
}
return result;
}
bool Scope::activeStyleSheetsContains(const CSSStyleSheet* sheet) const
{
if (!m_weakCopyOfActiveStyleSheetListForFastLookup) {
m_weakCopyOfActiveStyleSheetListForFastLookup = std::make_unique<HashSet<const CSSStyleSheet*>>();
for (auto& activeStyleSheet : m_activeStyleSheets)
m_weakCopyOfActiveStyleSheetListForFastLookup->add(activeStyleSheet.get());
}
return m_weakCopyOfActiveStyleSheetListForFastLookup->contains(sheet);
}
void Scope::flushPendingSelfUpdate()
{
ASSERT(m_pendingUpdate);
auto updateType = *m_pendingUpdate;
clearPendingUpdate();
updateActiveStyleSheets(updateType);
}
void Scope::flushPendingDescendantUpdates()
{
ASSERT(m_hasDescendantWithPendingUpdate);
ASSERT(!m_shadowRoot);
for (auto* descendantShadowRoot : m_document.inDocumentShadowRoots())
descendantShadowRoot->styleScope().flushPendingUpdate();
m_hasDescendantWithPendingUpdate = false;
}
void Scope::clearPendingUpdate()
{
m_pendingUpdateTimer.stop();
m_pendingUpdate = { };
}
void Scope::scheduleUpdate(UpdateType update)
{
if (update == UpdateType::ContentsOrInterpretation) {
// :host and ::slotted rules might go away.
if (m_shadowRoot && m_resolver)
invalidateHostAndSlottedStyleIfNeeded(*m_shadowRoot, *m_resolver);
// FIXME: Animation code may trigger resource load in middle of style recalc and that can add a rule to a content extension stylesheet.
// Fix and remove isResolvingTreeStyle() test below, see https://bugs.webkit.org/show_bug.cgi?id=194335
// FIXME: The m_isUpdatingStyleResolver test is here because extension stylesheets can get us here from StyleResolver::appendAuthorStyleSheets.
if (!m_isUpdatingStyleResolver && !m_document.isResolvingTreeStyle())
clearResolver();
}
if (!m_pendingUpdate || *m_pendingUpdate < update) {
m_pendingUpdate = update;
if (m_shadowRoot)
m_document.styleScope().m_hasDescendantWithPendingUpdate = true;
}
if (m_pendingUpdateTimer.isActive())
return;
m_pendingUpdateTimer.startOneShot(0_s);
}
void Scope::evaluateMediaQueriesForViewportChange()
{
evaluateMediaQueries([] (StyleResolver& resolver) {
return resolver.hasMediaQueriesAffectedByViewportChange();
});
}
void Scope::evaluateMediaQueriesForAccessibilitySettingsChange()
{
evaluateMediaQueries([] (StyleResolver& resolver) {
return resolver.hasMediaQueriesAffectedByAccessibilitySettingsChange();
});
}
void Scope::evaluateMediaQueriesForAppearanceChange()
{
evaluateMediaQueries([] (StyleResolver& resolver) {
return resolver.hasMediaQueriesAffectedByAppearanceChange();
});
}
template <typename TestFunction>
void Scope::evaluateMediaQueries(TestFunction&& testFunction)
{
if (!m_shadowRoot) {
for (auto* descendantShadowRoot : m_document.inDocumentShadowRoots())
descendantShadowRoot->styleScope().evaluateMediaQueries(testFunction);
}
auto* resolver = resolverIfExists();
if (!resolver)
return;
if (!testFunction(*resolver))
return;
scheduleUpdate(UpdateType::ContentsOrInterpretation);
InspectorInstrumentation::mediaQueryResultChanged(m_document);
}
void Scope::didChangeActiveStyleSheetCandidates()
{
scheduleUpdate(UpdateType::ActiveSet);
}
void Scope::didChangeStyleSheetContents()
{
scheduleUpdate(UpdateType::ContentsOrInterpretation);
}
void Scope::didChangeStyleSheetEnvironment()
{
if (!m_shadowRoot) {
for (auto* descendantShadowRoot : m_document.inDocumentShadowRoots()) {
// Stylesheets is author shadow roots are potentially affected.
if (descendantShadowRoot->mode() != ShadowRootMode::UserAgent)
descendantShadowRoot->styleScope().scheduleUpdate(UpdateType::ContentsOrInterpretation);
}
}
scheduleUpdate(UpdateType::ContentsOrInterpretation);
}
void Scope::pendingUpdateTimerFired()
{
flushPendingUpdate();
}
const Vector<RefPtr<StyleSheet>>& Scope::styleSheetsForStyleSheetList()
{
// FIXME: StyleSheetList content should be updated separately from style resolver updates.
flushPendingUpdate();
return m_styleSheetsForStyleSheetList;
}
}
}