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gecko/layout/style/nsStyleSet.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* the container for the style sheets that apply to a presentation, and
* the internal API that the style system exposes for creating (and
* potentially re-creating) style contexts
*/
#include "nsStyleSet.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/CSSStyleSheet.h"
#include "mozilla/EffectCompositor.h"
#include "mozilla/EnumeratedRange.h"
#include "mozilla/EventStates.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/RuleProcessorCache.h"
#include "nsIDocumentInlines.h"
#include "nsRuleWalker.h"
#include "nsStyleContext.h"
#include "mozilla/css/StyleRule.h"
#include "nsCSSAnonBoxes.h"
#include "nsCSSPseudoElements.h"
#include "nsCSSRuleProcessor.h"
#include "nsDataHashtable.h"
#include "nsIContent.h"
#include "nsRuleData.h"
#include "nsRuleProcessorData.h"
#include "nsAnimationManager.h"
#include "nsStyleSheetService.h"
#include "mozilla/dom/Element.h"
#include "GeckoProfiler.h"
#include "nsHTMLCSSStyleSheet.h"
#include "nsHTMLStyleSheet.h"
#include "SVGAttrAnimationRuleProcessor.h"
#include "nsCSSRules.h"
#include "nsPrintfCString.h"
#include "nsIFrame.h"
#include "RestyleManager.h"
#include "nsQueryObject.h"
#include <inttypes.h>
using namespace mozilla;
using namespace mozilla::dom;
NS_IMPL_ISUPPORTS(nsEmptyStyleRule, nsIStyleRule)
/* virtual */ void
nsEmptyStyleRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
}
/* virtual */ bool
nsEmptyStyleRule::MightMapInheritedStyleData()
{
return false;
}
#ifdef DEBUG
/* virtual */ void
nsEmptyStyleRule::List(FILE* out, int32_t aIndent) const
{
nsAutoCString indentStr;
for (int32_t index = aIndent; --index >= 0; ) {
indentStr.AppendLiteral(" ");
}
fprintf_stderr(out, "%s[empty style rule] {}\n", indentStr.get());
}
#endif
NS_IMPL_ISUPPORTS(nsInitialStyleRule, nsIStyleRule)
/* virtual */ void
nsInitialStyleRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
// Iterate over the property groups
for (nsStyleStructID sid = nsStyleStructID(0);
sid < nsStyleStructID_Length; sid = nsStyleStructID(sid + 1)) {
if (aRuleData->mSIDs & (1 << sid)) {
// Iterate over nsCSSValues within the property group
nsCSSValue * const value_start =
aRuleData->mValueStorage + aRuleData->mValueOffsets[sid];
for (nsCSSValue *value = value_start,
*value_end = value + nsCSSProps::PropertyCountInStruct(sid);
value != value_end; ++value) {
// If MathML is disabled take care not to set MathML properties (or we
// will trigger assertions in nsRuleNode)
if (sid == eStyleStruct_Font &&
!aRuleData->mPresContext->Document()->GetMathMLEnabled()) {
size_t index = value - value_start;
if (index == nsCSSProps::PropertyIndexInStruct(
eCSSProperty_script_level) ||
index == nsCSSProps::PropertyIndexInStruct(
eCSSProperty_script_size_multiplier) ||
index == nsCSSProps::PropertyIndexInStruct(
eCSSProperty_script_min_size) ||
index == nsCSSProps::PropertyIndexInStruct(
eCSSProperty_math_variant) ||
index == nsCSSProps::PropertyIndexInStruct(
eCSSProperty_math_display)) {
continue;
}
}
if (value->GetUnit() == eCSSUnit_Null) {
value->SetInitialValue();
}
}
}
}
}
/* virtual */ bool
nsInitialStyleRule::MightMapInheritedStyleData()
{
return true;
}
#ifdef DEBUG
/* virtual */ void
nsInitialStyleRule::List(FILE* out, int32_t aIndent) const
{
nsAutoCString indentStr;
for (int32_t index = aIndent; --index >= 0; ) {
indentStr.AppendLiteral(" ");
}
fprintf_stderr(out, "%s[initial style rule] {}\n", indentStr.get());
}
#endif
NS_IMPL_ISUPPORTS(nsDisableTextZoomStyleRule, nsIStyleRule)
/* virtual */ void
nsDisableTextZoomStyleRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
if (!(aRuleData->mSIDs & NS_STYLE_INHERIT_BIT(Font)))
return;
nsCSSValue* value = aRuleData->ValueForTextZoom();
if (value->GetUnit() == eCSSUnit_Null)
value->SetNoneValue();
}
/* virtual */ bool
nsDisableTextZoomStyleRule::MightMapInheritedStyleData()
{
return true;
}
#ifdef DEBUG
/* virtual */ void
nsDisableTextZoomStyleRule::List(FILE* out, int32_t aIndent) const
{
nsAutoCString indentStr;
for (int32_t index = aIndent; --index >= 0; ) {
indentStr.AppendLiteral(" ");
}
fprintf_stderr(out, "%s[disable text zoom style rule] {}\n", indentStr.get());
}
#endif
static const SheetType gCSSSheetTypes[] = {
// From lowest to highest in cascading order.
SheetType::Agent,
SheetType::User,
SheetType::Doc,
SheetType::ScopedDoc,
SheetType::Override
};
static bool IsCSSSheetType(SheetType aSheetType)
{
for (SheetType type : gCSSSheetTypes) {
if (type == aSheetType) {
return true;
}
}
return false;
}
nsStyleSet::nsStyleSet()
: mRuleTree(nullptr),
mBatching(0),
mInShutdown(false),
mAuthorStyleDisabled(false),
mInReconstruct(false),
mInitFontFeatureValuesLookup(true),
mNeedsRestyleAfterEnsureUniqueInner(false),
mDirty(0),
mUnusedRuleNodeCount(0)
{
}
nsStyleSet::~nsStyleSet()
{
for (SheetType type : gCSSSheetTypes) {
for (CSSStyleSheet* sheet : mSheets[type]) {
sheet->DropStyleSet(this);
}
}
// drop reference to cached rule processors
nsCSSRuleProcessor* rp;
rp = static_cast<nsCSSRuleProcessor*>(mRuleProcessors[SheetType::Agent].get());
if (rp) {
MOZ_ASSERT(rp->IsShared());
rp->ReleaseStyleSetRef();
}
rp = static_cast<nsCSSRuleProcessor*>(mRuleProcessors[SheetType::User].get());
if (rp) {
MOZ_ASSERT(rp->IsShared());
rp->ReleaseStyleSetRef();
}
}
size_t
nsStyleSet::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
size_t n = aMallocSizeOf(this);
for (SheetType type : MakeEnumeratedRange(SheetType::Count)) {
if (mRuleProcessors[type]) {
bool shared = false;
if (type == SheetType::Agent || type == SheetType::User) {
// The only two origins we consider caching rule processors for.
nsCSSRuleProcessor* rp =
static_cast<nsCSSRuleProcessor*>(mRuleProcessors[type].get());
shared = rp->IsShared();
}
if (!shared) {
n += mRuleProcessors[type]->SizeOfIncludingThis(aMallocSizeOf);
}
}
// We don't own the sheets (either the nsLayoutStyleSheetCache singleton
// or our document owns them).
n += mSheets[type].ShallowSizeOfExcludingThis(aMallocSizeOf);
}
for (uint32_t i = 0; i < mScopedDocSheetRuleProcessors.Length(); i++) {
n += mScopedDocSheetRuleProcessors[i]->SizeOfIncludingThis(aMallocSizeOf);
}
n += mScopedDocSheetRuleProcessors.ShallowSizeOfExcludingThis(aMallocSizeOf);
n += mRoots.ShallowSizeOfExcludingThis(aMallocSizeOf);
n += mOldRuleTrees.ShallowSizeOfExcludingThis(aMallocSizeOf);
return n;
}
void
nsStyleSet::Init(nsPresContext *aPresContext)
{
mFirstLineRule = new nsEmptyStyleRule;
mFirstLetterRule = new nsEmptyStyleRule;
mPlaceholderRule = new nsEmptyStyleRule;
mDisableTextZoomStyleRule = new nsDisableTextZoomStyleRule;
mRuleTree = nsRuleNode::CreateRootNode(aPresContext);
// Make an explicit GatherRuleProcessors call for the levels that
// don't have style sheets. The other levels will have their calls
// triggered by DirtyRuleProcessors.
GatherRuleProcessors(SheetType::PresHint);
GatherRuleProcessors(SheetType::SVGAttrAnimation);
GatherRuleProcessors(SheetType::StyleAttr);
GatherRuleProcessors(SheetType::Animation);
GatherRuleProcessors(SheetType::Transition);
}
nsresult
nsStyleSet::BeginReconstruct()
{
NS_ASSERTION(!mInReconstruct, "Unmatched begin/end?");
NS_ASSERTION(mRuleTree, "Reconstructing before first construction?");
// Clear any ArenaRefPtr-managed style contexts, as we don't want them
// held on to after the rule tree has been reconstructed.
PresContext()->PresShell()->ClearArenaRefPtrs(eArenaObjectID_nsStyleContext);
// Create a new rule tree root
nsRuleNode* newTree = nsRuleNode::CreateRootNode(mRuleTree->PresContext());
// Save the old rule tree so we can destroy it later
if (!mOldRuleTrees.AppendElement(mRuleTree)) {
newTree->Destroy();
return NS_ERROR_OUT_OF_MEMORY;
}
// We need to keep mRoots so that the rule tree GC will only free the
// rule trees that really aren't referenced anymore (which should be
// all of them, if there are no bugs in reresolution code).
mInReconstruct = true;
mRuleTree = newTree;
return NS_OK;
}
void
nsStyleSet::EndReconstruct()
{
NS_ASSERTION(mInReconstruct, "Unmatched begin/end?");
mInReconstruct = false;
#ifdef DEBUG
for (int32_t i = mRoots.Length() - 1; i >= 0; --i) {
// Since nsStyleContext's mParent and mRuleNode are immutable, and
// style contexts own their parents, and nsStyleContext asserts in
// its constructor that the style context and its parent are in the
// same rule tree, we don't need to check any of the children of
// mRoots; we only need to check the rule nodes of mRoots
// themselves.
NS_ASSERTION(mRoots[i]->RuleNode()->RuleTree() == mRuleTree,
"style context has old rule node");
}
#endif
// This *should* destroy the only element of mOldRuleTrees, but in
// case of some bugs (which would trigger the above assertions), it
// won't.
GCRuleTrees();
}
typedef nsDataHashtable<nsPtrHashKey<nsINode>, uint32_t> ScopeDepthCache;
// Returns the depth of a style scope element, with 1 being the depth of
// a style scope element that has no ancestor style scope elements. The
// depth does not count intervening non-scope elements.
static uint32_t
GetScopeDepth(nsINode* aScopeElement, ScopeDepthCache& aCache)
{
nsINode* parent = aScopeElement->GetParent();
if (!parent || !parent->IsElementInStyleScope()) {
return 1;
}
uint32_t depth = aCache.Get(aScopeElement);
if (!depth) {
for (nsINode* n = parent; n; n = n->GetParent()) {
if (n->IsScopedStyleRoot()) {
depth = GetScopeDepth(n, aCache) + 1;
aCache.Put(aScopeElement, depth);
break;
}
}
}
return depth;
}
struct ScopedSheetOrder
{
CSSStyleSheet* mSheet;
uint32_t mDepth;
uint32_t mOrder;
bool operator==(const ScopedSheetOrder& aRHS) const
{
return mDepth == aRHS.mDepth &&
mOrder == aRHS.mOrder;
}
bool operator<(const ScopedSheetOrder& aRHS) const
{
if (mDepth != aRHS.mDepth) {
return mDepth < aRHS.mDepth;
}
return mOrder < aRHS.mOrder;
}
};
// Sorts aSheets such that style sheets for ancestor scopes come
// before those for descendant scopes, and with sheets for a single
// scope in document order.
static void
SortStyleSheetsByScope(nsTArray<CSSStyleSheet*>& aSheets)
{
uint32_t n = aSheets.Length();
if (n == 1) {
return;
}
ScopeDepthCache cache;
nsTArray<ScopedSheetOrder> sheets;
sheets.SetLength(n);
// For each sheet, record the depth of its scope element and its original
// document order.
for (uint32_t i = 0; i < n; i++) {
sheets[i].mSheet = aSheets[i];
sheets[i].mDepth = GetScopeDepth(aSheets[i]->GetScopeElement(), cache);
sheets[i].mOrder = i;
}
// Sort by depth first, then document order.
sheets.Sort();
for (uint32_t i = 0; i < n; i++) {
aSheets[i] = sheets[i].mSheet;
}
}
nsresult
nsStyleSet::GatherRuleProcessors(SheetType aType)
{
NS_ENSURE_FALSE(mInShutdown, NS_ERROR_FAILURE);
// We might be in GatherRuleProcessors because we are dropping a sheet,
// resulting in an nsCSSSelector being destroyed. Tell the
// RestyleManager for each document we're used in so that they can
// drop any nsCSSSelector pointers (used for eRestyle_SomeDescendants)
// in their mPendingRestyles.
if (IsCSSSheetType(aType)) {
ClearSelectors();
}
nsCOMPtr<nsIStyleRuleProcessor> oldRuleProcessor(mRuleProcessors[aType]);
nsTArray<nsCOMPtr<nsIStyleRuleProcessor>> oldScopedDocRuleProcessors;
if (aType == SheetType::Agent || aType == SheetType::User) {
// drop reference to cached rule processor
nsCSSRuleProcessor* rp =
static_cast<nsCSSRuleProcessor*>(mRuleProcessors[aType].get());
if (rp) {
MOZ_ASSERT(rp->IsShared());
rp->ReleaseStyleSetRef();
}
}
mRuleProcessors[aType] = nullptr;
if (aType == SheetType::ScopedDoc) {
for (uint32_t i = 0; i < mScopedDocSheetRuleProcessors.Length(); i++) {
nsIStyleRuleProcessor* processor = mScopedDocSheetRuleProcessors[i].get();
Element* scope =
static_cast<nsCSSRuleProcessor*>(processor)->GetScopeElement();
scope->ClearIsScopedStyleRoot();
}
// Clear mScopedDocSheetRuleProcessors, but save it.
oldScopedDocRuleProcessors.SwapElements(mScopedDocSheetRuleProcessors);
}
if (mAuthorStyleDisabled && (aType == SheetType::Doc ||
aType == SheetType::ScopedDoc ||
aType == SheetType::StyleAttr)) {
// Don't regather if this level is disabled. Note that we gather
// preshint sheets no matter what, but then skip them for some
// elements later if mAuthorStyleDisabled.
return NS_OK;
}
switch (aType) {
// levels that do not contain CSS style sheets
case SheetType::Animation:
MOZ_ASSERT(mSheets[aType].IsEmpty());
mRuleProcessors[aType] = PresContext()->EffectCompositor()->
RuleProcessor(EffectCompositor::CascadeLevel::Animations);
return NS_OK;
case SheetType::Transition:
MOZ_ASSERT(mSheets[aType].IsEmpty());
mRuleProcessors[aType] = PresContext()->EffectCompositor()->
RuleProcessor(EffectCompositor::CascadeLevel::Transitions);
return NS_OK;
case SheetType::StyleAttr:
MOZ_ASSERT(mSheets[aType].IsEmpty());
mRuleProcessors[aType] = PresContext()->Document()->GetInlineStyleSheet();
return NS_OK;
case SheetType::PresHint:
MOZ_ASSERT(mSheets[aType].IsEmpty());
mRuleProcessors[aType] =
PresContext()->Document()->GetAttributeStyleSheet();
return NS_OK;
case SheetType::SVGAttrAnimation:
MOZ_ASSERT(mSheets[aType].IsEmpty());
mRuleProcessors[aType] =
PresContext()->Document()->GetSVGAttrAnimationRuleProcessor();
return NS_OK;
default:
// keep going
break;
}
MOZ_ASSERT(IsCSSSheetType(aType));
if (aType == SheetType::ScopedDoc) {
// Create a rule processor for each scope.
uint32_t count = mSheets[SheetType::ScopedDoc].Length();
if (count) {
// Gather the scoped style sheets into an array as
// CSSStyleSheets, and mark all of their scope elements
// as scoped style roots.
nsTArray<CSSStyleSheet*> sheets(count);
for (CSSStyleSheet* sheet : mSheets[SheetType::ScopedDoc]) {
sheets.AppendElement(sheet);
Element* scope = sheet->GetScopeElement();
scope->SetIsScopedStyleRoot();
}
// Sort the scoped style sheets so that those for the same scope are
// adjacent and that ancestor scopes come before descendent scopes.
SortStyleSheetsByScope(sheets);
// Put the old scoped rule processors in a hashtable so that we
// can retrieve them efficiently, even in edge cases like the
// simultaneous removal and addition of a large number of elements
// with scoped sheets.
nsDataHashtable<nsPtrHashKey<Element>,
nsCSSRuleProcessor*> oldScopedRuleProcessorHash;
for (size_t i = oldScopedDocRuleProcessors.Length(); i-- != 0; ) {
nsCSSRuleProcessor* oldRP =
static_cast<nsCSSRuleProcessor*>(oldScopedDocRuleProcessors[i].get());
Element* scope = oldRP->GetScopeElement();
MOZ_ASSERT(!oldScopedRuleProcessorHash.Get(scope),
"duplicate rule processors for same scope element?");
oldScopedRuleProcessorHash.Put(scope, oldRP);
}
uint32_t start = 0, end;
do {
// Find the range of style sheets with the same scope.
Element* scope = sheets[start]->GetScopeElement();
end = start + 1;
while (end < count && sheets[end]->GetScopeElement() == scope) {
end++;
}
scope->SetIsScopedStyleRoot();
// Create a rule processor for the scope.
nsTArray<RefPtr<CSSStyleSheet>> sheetsForScope;
sheetsForScope.AppendElements(sheets.Elements() + start, end - start);
nsCSSRuleProcessor* oldRP = oldScopedRuleProcessorHash.Get(scope);
mScopedDocSheetRuleProcessors.AppendElement
(new nsCSSRuleProcessor(sheetsForScope, aType, scope, oldRP));
start = end;
} while (start < count);
}
return NS_OK;
}
if (!mSheets[aType].IsEmpty()) {
switch (aType) {
case SheetType::Agent:
case SheetType::User: {
// levels containing non-scoped CSS style sheets whose rule processors
// we want to re-use
nsTArray<CSSStyleSheet*> sheets(mSheets[aType].Length());
for (CSSStyleSheet* sheet : mSheets[aType]) {
sheets.AppendElement(sheet);
}
nsCSSRuleProcessor* rp =
RuleProcessorCache::GetRuleProcessor(sheets, PresContext());
if (!rp) {
rp = new nsCSSRuleProcessor(mSheets[aType], aType, nullptr,
static_cast<nsCSSRuleProcessor*>(
oldRuleProcessor.get()),
true /* aIsShared */);
nsTArray<css::DocumentRule*> documentRules;
nsDocumentRuleResultCacheKey cacheKey;
rp->TakeDocumentRulesAndCacheKey(PresContext(),
documentRules, cacheKey);
RuleProcessorCache::PutRuleProcessor(sheets,
Move(documentRules),
cacheKey, rp);
}
mRuleProcessors[aType] = rp;
rp->AddStyleSetRef();
break;
}
case SheetType::Doc:
case SheetType::Override: {
// levels containing non-scoped CSS stylesheets whose rule processors
// we don't want to re-use
mRuleProcessors[aType] =
new nsCSSRuleProcessor(mSheets[aType], aType, nullptr,
static_cast<nsCSSRuleProcessor*>(
oldRuleProcessor.get()));
} break;
default:
MOZ_ASSERT_UNREACHABLE("non-CSS sheet types should be handled above");
break;
}
}
return NS_OK;
}
nsresult
nsStyleSet::AppendStyleSheet(SheetType aType, CSSStyleSheet* aSheet)
{
NS_PRECONDITION(aSheet, "null arg");
NS_ASSERTION(aSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
bool present = mSheets[aType].RemoveElement(aSheet);
mSheets[aType].AppendElement(aSheet);
if (!present && IsCSSSheetType(aType)) {
aSheet->AddStyleSet(this);
}
return DirtyRuleProcessors(aType);
}
nsresult
nsStyleSet::PrependStyleSheet(SheetType aType, CSSStyleSheet* aSheet)
{
NS_PRECONDITION(aSheet, "null arg");
NS_ASSERTION(aSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
bool present = mSheets[aType].RemoveElement(aSheet);
mSheets[aType].InsertElementAt(0, aSheet);
if (!present && IsCSSSheetType(aType)) {
aSheet->AddStyleSet(this);
}
return DirtyRuleProcessors(aType);
}
nsresult
nsStyleSet::RemoveStyleSheet(SheetType aType, CSSStyleSheet* aSheet)
{
NS_PRECONDITION(aSheet, "null arg");
NS_ASSERTION(aSheet->IsComplete(),
"Incomplete sheet being removed from style set");
if (mSheets[aType].RemoveElement(aSheet)) {
if (IsCSSSheetType(aType)) {
aSheet->DropStyleSet(this);
}
}
return DirtyRuleProcessors(aType);
}
nsresult
nsStyleSet::ReplaceSheets(SheetType aType,
const nsTArray<RefPtr<CSSStyleSheet>>& aNewSheets)
{
bool cssSheetType = IsCSSSheetType(aType);
if (cssSheetType) {
for (CSSStyleSheet* sheet : mSheets[aType]) {
sheet->DropStyleSet(this);
}
}
mSheets[aType].Clear();
mSheets[aType].AppendElements(aNewSheets);
if (cssSheetType) {
for (CSSStyleSheet* sheet : mSheets[aType]) {
sheet->AddStyleSet(this);
}
}
return DirtyRuleProcessors(aType);
}
nsresult
nsStyleSet::InsertStyleSheetBefore(SheetType aType, CSSStyleSheet* aNewSheet,
CSSStyleSheet* aReferenceSheet)
{
NS_PRECONDITION(aNewSheet && aReferenceSheet, "null arg");
NS_ASSERTION(aNewSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
bool present = mSheets[aType].RemoveElement(aNewSheet);
int32_t idx = mSheets[aType].IndexOf(aReferenceSheet);
if (idx < 0)
return NS_ERROR_INVALID_ARG;
mSheets[aType].InsertElementAt(idx, aNewSheet);
if (!present && IsCSSSheetType(aType)) {
aNewSheet->AddStyleSet(this);
}
return DirtyRuleProcessors(aType);
}
static inline uint32_t
DirtyBit(SheetType aType)
{
return 1 << uint32_t(aType);
}
nsresult
nsStyleSet::DirtyRuleProcessors(SheetType aType)
{
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= DirtyBit(aType);
return NS_OK;
}
bool
nsStyleSet::GetAuthorStyleDisabled() const
{
return mAuthorStyleDisabled;
}
nsresult
nsStyleSet::SetAuthorStyleDisabled(bool aStyleDisabled)
{
if (aStyleDisabled == !mAuthorStyleDisabled) {
mAuthorStyleDisabled = aStyleDisabled;
BeginUpdate();
mDirty |= DirtyBit(SheetType::Doc) |
DirtyBit(SheetType::ScopedDoc) |
DirtyBit(SheetType::StyleAttr);
return EndUpdate();
}
return NS_OK;
}
// -------- Doc Sheets
nsresult
nsStyleSet::AddDocStyleSheet(CSSStyleSheet* aSheet, nsIDocument* aDocument)
{
NS_PRECONDITION(aSheet && aDocument, "null arg");
NS_ASSERTION(aSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
SheetType type = aSheet->GetScopeElement() ?
SheetType::ScopedDoc :
SheetType::Doc;
nsTArray<RefPtr<CSSStyleSheet>>& sheets = mSheets[type];
bool present = sheets.RemoveElement(aSheet);
nsStyleSheetService *sheetService = nsStyleSheetService::GetInstance();
// lowest index first
int32_t newDocIndex = aDocument->GetIndexOfStyleSheet(aSheet);
int32_t count = sheets.Length();
int32_t index;
for (index = 0; index < count; index++) {
CSSStyleSheet* sheet = sheets[index];
int32_t sheetDocIndex = aDocument->GetIndexOfStyleSheet(sheet);
if (sheetDocIndex > newDocIndex)
break;
// If the sheet is not owned by the document it can be an author
// sheet registered at nsStyleSheetService or an additional author
// sheet on the document, which means the new
// doc sheet should end up before it.
if (sheetDocIndex < 0) {
if (sheetService) {
auto& authorSheets = *sheetService->AuthorStyleSheets();
if (authorSheets.IndexOf(sheet) != authorSheets.NoIndex) {
break;
}
}
if (sheet == aDocument->FirstAdditionalAuthorSheet()) {
break;
}
}
}
sheets.InsertElementAt(index, aSheet);
if (!present) {
aSheet->AddStyleSet(this);
}
return DirtyRuleProcessors(type);
}
nsresult
nsStyleSet::RemoveDocStyleSheet(CSSStyleSheet* aSheet)
{
bool isScoped = aSheet->GetScopeElement();
return RemoveStyleSheet(isScoped ? SheetType::ScopedDoc : SheetType::Doc,
aSheet);
}
// Batching
void
nsStyleSet::BeginUpdate()
{
++mBatching;
}
nsresult
nsStyleSet::EndUpdate()
{
NS_ASSERTION(mBatching > 0, "Unbalanced EndUpdate");
if (--mBatching) {
// We're not completely done yet.
return NS_OK;
}
for (SheetType type : MakeEnumeratedRange(SheetType::Count)) {
if (mDirty & DirtyBit(type)) {
nsresult rv = GatherRuleProcessors(type);
NS_ENSURE_SUCCESS(rv, rv);
}
}
mDirty = 0;
return NS_OK;
}
template<class T>
static bool
EnumRulesMatching(nsIStyleRuleProcessor* aProcessor, void* aData)
{
T* data = static_cast<T*>(aData);
aProcessor->RulesMatching(data);
return true;
}
static inline bool
IsMoreSpecificThanAnimation(nsRuleNode *aRuleNode)
{
return !aRuleNode->IsRoot() &&
(aRuleNode->GetLevel() == SheetType::Transition ||
aRuleNode->IsImportantRule());
}
static nsIStyleRule*
GetAnimationRule(nsRuleNode *aRuleNode)
{
nsRuleNode *n = aRuleNode;
while (IsMoreSpecificThanAnimation(n)) {
n = n->GetParent();
}
if (n->IsRoot() || n->GetLevel() != SheetType::Animation) {
return nullptr;
}
return n->GetRule();
}
static nsRuleNode*
ReplaceAnimationRule(nsRuleNode *aOldRuleNode,
nsIStyleRule *aOldAnimRule,
nsIStyleRule *aNewAnimRule)
{
nsTArray<nsRuleNode*> moreSpecificNodes;
nsRuleNode *n = aOldRuleNode;
while (IsMoreSpecificThanAnimation(n)) {
moreSpecificNodes.AppendElement(n);
n = n->GetParent();
}
if (aOldAnimRule) {
MOZ_ASSERT(n->GetRule() == aOldAnimRule, "wrong rule");
MOZ_ASSERT(n->GetLevel() == SheetType::Animation,
"wrong level");
n = n->GetParent();
}
MOZ_ASSERT(!IsMoreSpecificThanAnimation(n) &&
(n->IsRoot() || n->GetLevel() != SheetType::Animation),
"wrong level");
if (aNewAnimRule) {
n = n->Transition(aNewAnimRule, SheetType::Animation, false);
n->SetIsAnimationRule();
}
for (uint32_t i = moreSpecificNodes.Length(); i-- != 0; ) {
nsRuleNode *oldNode = moreSpecificNodes[i];
n = n->Transition(oldNode->GetRule(), oldNode->GetLevel(),
oldNode->IsImportantRule());
}
return n;
}
/**
* |GetContext| implements sharing of style contexts (not just the data
* on the rule nodes) between siblings and cousins of the same
* generation. (It works for cousins of the same generation since
* |aParentContext| could itself be a shared context.)
*/
already_AddRefed<nsStyleContext>
nsStyleSet::GetContext(nsStyleContext* aParentContext,
nsRuleNode* aRuleNode,
// aVisitedRuleNode may be null; if it is null
// it means that we don't need to force creation
// of a StyleIfVisited. (But if we make one
// because aParentContext has one, then aRuleNode
// should be used.)
nsRuleNode* aVisitedRuleNode,
nsIAtom* aPseudoTag,
nsCSSPseudoElements::Type aPseudoType,
Element* aElementForAnimation,
uint32_t aFlags)
{
NS_PRECONDITION((!aPseudoTag &&
aPseudoType ==
nsCSSPseudoElements::ePseudo_NotPseudoElement) ||
(aPseudoTag &&
nsCSSPseudoElements::GetPseudoType(aPseudoTag) ==
aPseudoType),
"Pseudo mismatch");
if (aVisitedRuleNode == aRuleNode) {
// No need to force creation of a visited style in this case.
aVisitedRuleNode = nullptr;
}
// Ensure |aVisitedRuleNode != nullptr| corresponds to the need to
// create an if-visited style context, and that in that case, we have
// parentIfVisited set correctly.
nsStyleContext *parentIfVisited =
aParentContext ? aParentContext->GetStyleIfVisited() : nullptr;
if (parentIfVisited) {
if (!aVisitedRuleNode) {
aVisitedRuleNode = aRuleNode;
}
} else {
if (aVisitedRuleNode) {
parentIfVisited = aParentContext;
}
}
if (aFlags & eIsLink) {
// If this node is a link, we want its visited's style context's
// parent to be the regular style context of its parent, because
// only the visitedness of the relevant link should influence style.
parentIfVisited = aParentContext;
}
bool relevantLinkVisited = (aFlags & eIsLink) ?
(aFlags & eIsVisitedLink) :
(aParentContext && aParentContext->RelevantLinkVisited());
RefPtr<nsStyleContext> result;
if (aParentContext)
result = aParentContext->FindChildWithRules(aPseudoTag, aRuleNode,
aVisitedRuleNode,
relevantLinkVisited);
#ifdef NOISY_DEBUG
if (result)
fprintf(stdout, "--- SharedSC %d ---\n", ++gSharedCount);
else
fprintf(stdout, "+++ NewSC %d +++\n", ++gNewCount);
#endif
if (!result) {
result = NS_NewStyleContext(aParentContext, aPseudoTag, aPseudoType,
aRuleNode,
aFlags & eSkipParentDisplayBasedStyleFixup);
if (aVisitedRuleNode) {
RefPtr<nsStyleContext> resultIfVisited =
NS_NewStyleContext(parentIfVisited, aPseudoTag, aPseudoType,
aVisitedRuleNode,
aFlags & eSkipParentDisplayBasedStyleFixup);
if (!parentIfVisited) {
mRoots.AppendElement(resultIfVisited);
}
resultIfVisited->SetIsStyleIfVisited();
result->SetStyleIfVisited(resultIfVisited.forget());
if (relevantLinkVisited) {
result->AddStyleBit(NS_STYLE_RELEVANT_LINK_VISITED);
}
}
if (!aParentContext) {
mRoots.AppendElement(result);
}
}
else {
NS_ASSERTION(result->GetPseudoType() == aPseudoType, "Unexpected type");
NS_ASSERTION(result->GetPseudo() == aPseudoTag, "Unexpected pseudo");
}
if (aFlags & eDoAnimation) {
// Normally the animation manager has already added the correct
// style rule. However, if the animation-name just changed, it
// might have been wrong. So ask it to double-check based on the
// resulting style context.
nsIStyleRule *oldAnimRule = GetAnimationRule(aRuleNode);
nsIStyleRule *animRule = PresContext()->AnimationManager()->
CheckAnimationRule(result, aElementForAnimation);
MOZ_ASSERT(result->RuleNode() == aRuleNode,
"unexpected rule node");
MOZ_ASSERT(!result->GetStyleIfVisited() == !aVisitedRuleNode,
"unexpected visited rule node");
MOZ_ASSERT(!aVisitedRuleNode ||
result->GetStyleIfVisited()->RuleNode() == aVisitedRuleNode,
"unexpected visited rule node");
MOZ_ASSERT(!aVisitedRuleNode ||
oldAnimRule == GetAnimationRule(aVisitedRuleNode),
"animation rule mismatch between rule nodes");
if (oldAnimRule != animRule) {
nsRuleNode *ruleNode =
ReplaceAnimationRule(aRuleNode, oldAnimRule, animRule);
nsRuleNode *visitedRuleNode = aVisitedRuleNode
? ReplaceAnimationRule(aVisitedRuleNode, oldAnimRule, animRule)
: nullptr;
MOZ_ASSERT(!visitedRuleNode ||
GetAnimationRule(ruleNode) ==
GetAnimationRule(visitedRuleNode),
"animation rule mismatch between rule nodes");
result = GetContext(aParentContext, ruleNode, visitedRuleNode,
aPseudoTag, aPseudoType, nullptr,
aFlags & ~eDoAnimation);
}
}
if (aElementForAnimation &&
aElementForAnimation->IsHTMLElement(nsGkAtoms::body) &&
aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement &&
PresContext()->CompatibilityMode() == eCompatibility_NavQuirks) {
nsIDocument* doc = aElementForAnimation->GetCurrentDoc();
if (doc && doc->GetBodyElement() == aElementForAnimation) {
// Update the prescontext's body color
PresContext()->SetBodyTextColor(result->StyleColor()->mColor);
}
}
return result.forget();
}
void
nsStyleSet::AddImportantRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode,
nsRuleWalker* aRuleWalker)
{
NS_ASSERTION(aCurrLevelNode &&
aCurrLevelNode != aLastPrevLevelNode, "How did we get here?");
nsAutoTArray<nsIStyleRule*, 16> importantRules;
for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode;
node = node->GetParent()) {
// We guarantee that we never walk the root node here, so no need
// to null-check GetRule(). Furthermore, it must be a CSS rule.
NS_ASSERTION(RefPtr<css::Declaration>(do_QueryObject(node->GetRule())),
"Unexpected non-CSS rule");
nsIStyleRule* impRule =
static_cast<css::Declaration*>(node->GetRule())->GetImportantStyleData();
if (impRule)
importantRules.AppendElement(impRule);
}
NS_ASSERTION(importantRules.Length() != 0,
"Why did we think there were important rules?");
for (uint32_t i = importantRules.Length(); i-- != 0; ) {
aRuleWalker->Forward(importantRules[i]);
}
}
#ifdef DEBUG
void
nsStyleSet::AssertNoImportantRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode)
{
if (!aCurrLevelNode)
return;
for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode;
node = node->GetParent()) {
RefPtr<css::Declaration> declaration(do_QueryObject(node->GetRule()));
NS_ASSERTION(declaration, "Unexpected non-CSS rule");
NS_ASSERTION(!declaration->GetImportantStyleData(),
"Unexpected important style source");
}
}
void
nsStyleSet::AssertNoCSSRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode)
{
if (!aCurrLevelNode)
return;
for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode;
node = node->GetParent()) {
nsIStyleRule *rule = node->GetRule();
RefPtr<css::Declaration> declaration(do_QueryObject(rule));
if (declaration) {
RefPtr<css::StyleRule> cssRule =
do_QueryObject(declaration->GetOwningRule());
NS_ASSERTION(!cssRule || !cssRule->Selector(),
"Unexpected CSS rule");
}
}
}
#endif
// Enumerate the rules in a way that cares about the order of the rules.
void
nsStyleSet::FileRules(nsIStyleRuleProcessor::EnumFunc aCollectorFunc,
RuleProcessorData* aData, Element* aElement,
nsRuleWalker* aRuleWalker)
{
PROFILER_LABEL("nsStyleSet", "FileRules",
js::ProfileEntry::Category::CSS);
NS_ASSERTION(mBatching == 0, "rule processors out of date");
// Cascading order:
// [least important]
// - UA normal rules = Agent normal
// - User normal rules = User normal
// - Presentation hints = PresHint normal
// - SVG Animation (highest pres hint) = SVGAttrAnimation normal
// - Author normal rules = Document normal
// - Override normal rules = Override normal
// - animation rules = Animation normal
// - Author !important rules = Document !important
// - Override !important rules = Override !important
// - User !important rules = User !important
// - UA !important rules = Agent !important
// - transition rules = Transition normal
// [most important]
// Save off the last rule before we start walking our agent sheets;
// this will be either the root or one of the restriction rules.
nsRuleNode* lastRestrictionRN = aRuleWalker->CurrentNode();
aRuleWalker->SetLevel(SheetType::Agent, false, true);
if (mRuleProcessors[SheetType::Agent])
(*aCollectorFunc)(mRuleProcessors[SheetType::Agent], aData);
nsRuleNode* lastAgentRN = aRuleWalker->CurrentNode();
bool haveImportantUARules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(SheetType::User, false, true);
bool skipUserStyles =
aElement && aElement->IsInNativeAnonymousSubtree();
if (!skipUserStyles && mRuleProcessors[SheetType::User]) // NOTE: different
(*aCollectorFunc)(mRuleProcessors[SheetType::User], aData);
nsRuleNode* lastUserRN = aRuleWalker->CurrentNode();
bool haveImportantUserRules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(SheetType::PresHint, false, false);
if (mRuleProcessors[SheetType::PresHint])
(*aCollectorFunc)(mRuleProcessors[SheetType::PresHint], aData);
aRuleWalker->SetLevel(SheetType::SVGAttrAnimation, false, false);
if (mRuleProcessors[SheetType::SVGAttrAnimation])
(*aCollectorFunc)(mRuleProcessors[SheetType::SVGAttrAnimation], aData);
nsRuleNode* lastSVGAttrAnimationRN = aRuleWalker->CurrentNode();
aRuleWalker->SetLevel(SheetType::Doc, false, true);
bool cutOffInheritance = false;
if (mBindingManager && aElement) {
// We can supply additional document-level sheets that should be walked.
mBindingManager->WalkRules(aCollectorFunc,
static_cast<ElementDependentRuleProcessorData*>(aData),
&cutOffInheritance);
}
if (!skipUserStyles && !cutOffInheritance && // NOTE: different
mRuleProcessors[SheetType::Doc])
(*aCollectorFunc)(mRuleProcessors[SheetType::Doc], aData);
nsRuleNode* lastDocRN = aRuleWalker->CurrentNode();
bool haveImportantDocRules = !aRuleWalker->GetCheckForImportantRules();
nsTArray<nsRuleNode*> lastScopedRNs;
nsTArray<bool> haveImportantScopedRules;
bool haveAnyImportantScopedRules = false;
if (!skipUserStyles && !cutOffInheritance &&
aElement && aElement->IsElementInStyleScope()) {
lastScopedRNs.SetLength(mScopedDocSheetRuleProcessors.Length());
haveImportantScopedRules.SetLength(mScopedDocSheetRuleProcessors.Length());
for (uint32_t i = 0; i < mScopedDocSheetRuleProcessors.Length(); i++) {
aRuleWalker->SetLevel(SheetType::ScopedDoc, false, true);
nsCSSRuleProcessor* processor =
static_cast<nsCSSRuleProcessor*>(mScopedDocSheetRuleProcessors[i].get());
aData->mScope = processor->GetScopeElement();
(*aCollectorFunc)(mScopedDocSheetRuleProcessors[i], aData);
lastScopedRNs[i] = aRuleWalker->CurrentNode();
haveImportantScopedRules[i] = !aRuleWalker->GetCheckForImportantRules();
haveAnyImportantScopedRules = haveAnyImportantScopedRules || haveImportantScopedRules[i];
}
aData->mScope = nullptr;
}
nsRuleNode* lastScopedRN = aRuleWalker->CurrentNode();
aRuleWalker->SetLevel(SheetType::StyleAttr, false, true);
if (mRuleProcessors[SheetType::StyleAttr])
(*aCollectorFunc)(mRuleProcessors[SheetType::StyleAttr], aData);
nsRuleNode* lastStyleAttrRN = aRuleWalker->CurrentNode();
bool haveImportantStyleAttrRules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(SheetType::Override, false, true);
if (mRuleProcessors[SheetType::Override])
(*aCollectorFunc)(mRuleProcessors[SheetType::Override], aData);
nsRuleNode* lastOvrRN = aRuleWalker->CurrentNode();
bool haveImportantOverrideRules = !aRuleWalker->GetCheckForImportantRules();
// This needs to match IsMoreSpecificThanAnimation() above.
aRuleWalker->SetLevel(SheetType::Animation, false, false);
(*aCollectorFunc)(mRuleProcessors[SheetType::Animation], aData);
if (haveAnyImportantScopedRules) {
for (uint32_t i = lastScopedRNs.Length(); i-- != 0; ) {
aRuleWalker->SetLevel(SheetType::ScopedDoc, true, false);
nsRuleNode* startRN = lastScopedRNs[i];
nsRuleNode* endRN = i == 0 ? lastDocRN : lastScopedRNs[i - 1];
if (haveImportantScopedRules[i]) {
AddImportantRules(startRN, endRN, aRuleWalker); // scoped
}
#ifdef DEBUG
else {
AssertNoImportantRules(startRN, endRN);
}
#endif
}
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastScopedRN, lastDocRN);
}
#endif
if (haveImportantDocRules) {
aRuleWalker->SetLevel(SheetType::Doc, true, false);
AddImportantRules(lastDocRN, lastSVGAttrAnimationRN, aRuleWalker); // doc
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastDocRN, lastSVGAttrAnimationRN);
}
#endif
if (haveImportantStyleAttrRules) {
aRuleWalker->SetLevel(SheetType::StyleAttr, true, false);
AddImportantRules(lastStyleAttrRN, lastScopedRN, aRuleWalker); // style attr
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastStyleAttrRN, lastScopedRN);
}
#endif
if (haveImportantOverrideRules) {
aRuleWalker->SetLevel(SheetType::Override, true, false);
AddImportantRules(lastOvrRN, lastStyleAttrRN, aRuleWalker); // override
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastOvrRN, lastStyleAttrRN);
}
#endif
#ifdef DEBUG
AssertNoCSSRules(lastSVGAttrAnimationRN, lastUserRN);
#endif
if (haveImportantUserRules) {
aRuleWalker->SetLevel(SheetType::User, true, false);
AddImportantRules(lastUserRN, lastAgentRN, aRuleWalker); //user
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastUserRN, lastAgentRN);
}
#endif
if (haveImportantUARules) {
aRuleWalker->SetLevel(SheetType::Agent, true, false);
AddImportantRules(lastAgentRN, lastRestrictionRN, aRuleWalker); //agent
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastAgentRN, lastRestrictionRN);
}
#endif
#ifdef DEBUG
AssertNoCSSRules(lastRestrictionRN, mRuleTree);
#endif
#ifdef DEBUG
nsRuleNode *lastImportantRN = aRuleWalker->CurrentNode();
#endif
aRuleWalker->SetLevel(SheetType::Transition, false, false);
(*aCollectorFunc)(mRuleProcessors[SheetType::Transition], aData);
#ifdef DEBUG
AssertNoCSSRules(aRuleWalker->CurrentNode(), lastImportantRN);
#endif
}
// Enumerate all the rules in a way that doesn't care about the order
// of the rules and doesn't walk !important-rules.
void
nsStyleSet::WalkRuleProcessors(nsIStyleRuleProcessor::EnumFunc aFunc,
ElementDependentRuleProcessorData* aData,
bool aWalkAllXBLStylesheets)
{
NS_ASSERTION(mBatching == 0, "rule processors out of date");
if (mRuleProcessors[SheetType::Agent])
(*aFunc)(mRuleProcessors[SheetType::Agent], aData);
bool skipUserStyles = aData->mElement->IsInNativeAnonymousSubtree();
if (!skipUserStyles && mRuleProcessors[SheetType::User]) // NOTE: different
(*aFunc)(mRuleProcessors[SheetType::User], aData);
if (mRuleProcessors[SheetType::PresHint])
(*aFunc)(mRuleProcessors[SheetType::PresHint], aData);
if (mRuleProcessors[SheetType::SVGAttrAnimation])
(*aFunc)(mRuleProcessors[SheetType::SVGAttrAnimation], aData);
bool cutOffInheritance = false;
if (mBindingManager) {
// We can supply additional document-level sheets that should be walked.
if (aWalkAllXBLStylesheets) {
mBindingManager->WalkAllRules(aFunc, aData);
} else {
mBindingManager->WalkRules(aFunc, aData, &cutOffInheritance);
}
}
if (!skipUserStyles && !cutOffInheritance) {
if (mRuleProcessors[SheetType::Doc]) // NOTE: different
(*aFunc)(mRuleProcessors[SheetType::Doc], aData);
if (aData->mElement->IsElementInStyleScope()) {
for (uint32_t i = 0; i < mScopedDocSheetRuleProcessors.Length(); i++)
(*aFunc)(mScopedDocSheetRuleProcessors[i], aData);
}
}
if (mRuleProcessors[SheetType::StyleAttr])
(*aFunc)(mRuleProcessors[SheetType::StyleAttr], aData);
if (mRuleProcessors[SheetType::Override])
(*aFunc)(mRuleProcessors[SheetType::Override], aData);
(*aFunc)(mRuleProcessors[SheetType::Animation], aData);
(*aFunc)(mRuleProcessors[SheetType::Transition], aData);
}
static void
InitStyleScopes(TreeMatchContext& aTreeContext, Element* aElement)
{
if (aElement->IsElementInStyleScope()) {
aTreeContext.InitStyleScopes(aElement->GetParentElementCrossingShadowRoot());
}
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleFor(Element* aElement,
nsStyleContext* aParentContext)
{
TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited,
aElement->OwnerDoc());
InitStyleScopes(treeContext, aElement);
return ResolveStyleFor(aElement, aParentContext, treeContext);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleFor(Element* aElement,
nsStyleContext* aParentContext,
TreeMatchContext& aTreeMatchContext)
{
NS_ENSURE_FALSE(mInShutdown, nullptr);
NS_ASSERTION(aElement, "aElement must not be null");
nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled);
aTreeMatchContext.ResetForUnvisitedMatching();
ElementRuleProcessorData data(PresContext(), aElement, &ruleWalker,
aTreeMatchContext);
WalkDisableTextZoomRule(aElement, &ruleWalker);
FileRules(EnumRulesMatching<ElementRuleProcessorData>, &data, aElement,
&ruleWalker);
nsRuleNode *ruleNode = ruleWalker.CurrentNode();
nsRuleNode *visitedRuleNode = nullptr;
if (aTreeMatchContext.HaveRelevantLink()) {
aTreeMatchContext.ResetForVisitedMatching();
ruleWalker.Reset();
FileRules(EnumRulesMatching<ElementRuleProcessorData>, &data, aElement,
&ruleWalker);
visitedRuleNode = ruleWalker.CurrentNode();
}
uint32_t flags = eDoAnimation;
if (nsCSSRuleProcessor::IsLink(aElement)) {
flags |= eIsLink;
}
if (nsCSSRuleProcessor::GetContentState(aElement, aTreeMatchContext).
HasState(NS_EVENT_STATE_VISITED)) {
flags |= eIsVisitedLink;
}
if (aTreeMatchContext.mSkippingParentDisplayBasedStyleFixup) {
flags |= eSkipParentDisplayBasedStyleFixup;
}
return GetContext(aParentContext, ruleNode, visitedRuleNode,
nullptr, nsCSSPseudoElements::ePseudo_NotPseudoElement,
aElement, flags);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleForRules(nsStyleContext* aParentContext,
const nsTArray< nsCOMPtr<nsIStyleRule> > &aRules)
{
NS_ENSURE_FALSE(mInShutdown, nullptr);
nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled);
// FIXME: Perhaps this should be passed in, but it probably doesn't
// matter.
ruleWalker.SetLevel(SheetType::Doc, false, false);
for (uint32_t i = 0; i < aRules.Length(); i++) {
ruleWalker.ForwardOnPossiblyCSSRule(aRules.ElementAt(i));
}
return GetContext(aParentContext, ruleWalker.CurrentNode(), nullptr,
nullptr, nsCSSPseudoElements::ePseudo_NotPseudoElement,
nullptr, eNoFlags);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleByAddingRules(nsStyleContext* aBaseContext,
const nsCOMArray<nsIStyleRule> &aRules)
{
NS_ENSURE_FALSE(mInShutdown, nullptr);
nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled);
ruleWalker.SetCurrentNode(aBaseContext->RuleNode());
// This needs to be the transition sheet because that is the highest
// level of the cascade, and thus the only thing that makes sense if
// we are ever going to call ResolveStyleWithReplacement on the
// resulting context. It's also the right thing for the one case (the
// transition manager's cover rule) where we put the result of this
// function in the style context tree.
ruleWalker.SetLevel(SheetType::Transition, false, false);
for (int32_t i = 0; i < aRules.Count(); i++) {
ruleWalker.ForwardOnPossiblyCSSRule(aRules.ObjectAt(i));
}
nsRuleNode *ruleNode = ruleWalker.CurrentNode();
nsRuleNode *visitedRuleNode = nullptr;
if (aBaseContext->GetStyleIfVisited()) {
ruleWalker.SetCurrentNode(aBaseContext->GetStyleIfVisited()->RuleNode());
for (int32_t i = 0; i < aRules.Count(); i++) {
ruleWalker.ForwardOnPossiblyCSSRule(aRules.ObjectAt(i));
}
visitedRuleNode = ruleWalker.CurrentNode();
}
uint32_t flags = eNoFlags;
if (aBaseContext->IsLinkContext()) {
flags |= eIsLink;
// GetContext handles propagating RelevantLinkVisited state from the
// parent in non-link cases; all we need to pass in is if this link
// is visited.
if (aBaseContext->RelevantLinkVisited()) {
flags |= eIsVisitedLink;
}
}
return GetContext(aBaseContext->GetParent(), ruleNode, visitedRuleNode,
aBaseContext->GetPseudo(),
aBaseContext->GetPseudoType(),
nullptr, flags);
}
struct RuleNodeInfo {
nsIStyleRule* mRule;
SheetType mLevel;
bool mIsImportant;
bool mIsAnimationRule;
};
struct CascadeLevel {
SheetType mLevel;
bool mIsImportant;
bool mCheckForImportantRules;
nsRestyleHint mLevelReplacementHint;
};
static const CascadeLevel gCascadeLevels[] = {
{ SheetType::Agent, false, false, nsRestyleHint(0) },
{ SheetType::User, false, false, nsRestyleHint(0) },
{ SheetType::PresHint, false, false, nsRestyleHint(0) },
{ SheetType::SVGAttrAnimation, false, false, eRestyle_SVGAttrAnimations },
{ SheetType::Doc, false, false, nsRestyleHint(0) },
{ SheetType::ScopedDoc, false, false, nsRestyleHint(0) },
{ SheetType::StyleAttr, false, true, eRestyle_StyleAttribute |
eRestyle_StyleAttribute_Animations },
{ SheetType::Override, false, false, nsRestyleHint(0) },
{ SheetType::Animation, false, false, eRestyle_CSSAnimations },
{ SheetType::ScopedDoc, true, false, nsRestyleHint(0) },
{ SheetType::Doc, true, false, nsRestyleHint(0) },
{ SheetType::StyleAttr, true, false, eRestyle_StyleAttribute |
eRestyle_StyleAttribute_Animations },
{ SheetType::Override, true, false, nsRestyleHint(0) },
{ SheetType::User, true, false, nsRestyleHint(0) },
{ SheetType::Agent, true, false, nsRestyleHint(0) },
{ SheetType::Transition, false, false, eRestyle_CSSTransitions },
};
nsRuleNode*
nsStyleSet::RuleNodeWithReplacement(Element* aElement,
Element* aPseudoElement,
nsRuleNode* aOldRuleNode,
nsCSSPseudoElements::Type aPseudoType,
nsRestyleHint aReplacements)
{
NS_ASSERTION(mBatching == 0, "rule processors out of date");
MOZ_ASSERT(!aPseudoElement ==
(aPseudoType >= nsCSSPseudoElements::ePseudo_PseudoElementCount ||
!(nsCSSPseudoElements::PseudoElementSupportsStyleAttribute(aPseudoType) ||
nsCSSPseudoElements::PseudoElementSupportsUserActionState(aPseudoType))),
"should have aPseudoElement only for certain pseudo elements");
MOZ_ASSERT(!(aReplacements & ~(eRestyle_CSSTransitions |
eRestyle_CSSAnimations |
eRestyle_SVGAttrAnimations |
eRestyle_StyleAttribute |
eRestyle_StyleAttribute_Animations |
eRestyle_Force |
eRestyle_ForceDescendants)),
"unexpected replacement bits");
// FIXME (perf): This should probably not rebuild the whole path, but
// only the path from the last change in the rule tree, like
// ReplaceAnimationRule in nsStyleSet.cpp does. (That could then
// perhaps share this code, too?)
// But if we do that, we'll need to pass whether we are rebuilding the
// rule tree from ElementRestyler::RestyleSelf to avoid taking that
// path when we're rebuilding the rule tree.
// This array can be hot and often grows to ~20 elements, so inline storage
// is best.
nsAutoTArray<RuleNodeInfo, 30> rules;
for (nsRuleNode* ruleNode = aOldRuleNode; !ruleNode->IsRoot();
ruleNode = ruleNode->GetParent()) {
RuleNodeInfo* curRule = rules.AppendElement();
curRule->mRule = ruleNode->GetRule();
curRule->mLevel = ruleNode->GetLevel();
curRule->mIsImportant = ruleNode->IsImportantRule();
curRule->mIsAnimationRule = ruleNode->IsAnimationRule();
}
nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled);
auto rulesIndex = rules.Length();
// We need to transfer this information between the non-!important and
// !important phases for the style attribute level.
nsRuleNode* lastScopedRN = nullptr;
nsRuleNode* lastStyleAttrRN = nullptr;
bool haveImportantStyleAttrRules = false;
for (const CascadeLevel *level = gCascadeLevels,
*levelEnd = ArrayEnd(gCascadeLevels);
level != levelEnd; ++level) {
bool doReplace = level->mLevelReplacementHint & aReplacements;
ruleWalker.SetLevel(level->mLevel, level->mIsImportant,
level->mCheckForImportantRules && doReplace);
if (doReplace) {
switch (level->mLevel) {
case SheetType::Animation: {
if (aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement ||
aPseudoType == nsCSSPseudoElements::ePseudo_before ||
aPseudoType == nsCSSPseudoElements::ePseudo_after) {
nsIStyleRule* rule = PresContext()->EffectCompositor()->
GetAnimationRule(aElement, aPseudoType,
EffectCompositor::CascadeLevel::Animations);
if (rule) {
ruleWalker.ForwardOnPossiblyCSSRule(rule);
ruleWalker.CurrentNode()->SetIsAnimationRule();
}
}
break;
}
case SheetType::Transition: {
if (aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement ||
aPseudoType == nsCSSPseudoElements::ePseudo_before ||
aPseudoType == nsCSSPseudoElements::ePseudo_after) {
nsIStyleRule* rule = PresContext()->EffectCompositor()->
GetAnimationRule(aElement, aPseudoType,
EffectCompositor::CascadeLevel::Transitions);
if (rule) {
ruleWalker.ForwardOnPossiblyCSSRule(rule);
ruleWalker.CurrentNode()->SetIsAnimationRule();
}
}
break;
}
case SheetType::SVGAttrAnimation: {
SVGAttrAnimationRuleProcessor* ruleProcessor =
static_cast<SVGAttrAnimationRuleProcessor*>(
mRuleProcessors[SheetType::SVGAttrAnimation].get());
if (ruleProcessor &&
aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement) {
ruleProcessor->ElementRulesMatching(aElement, &ruleWalker);
}
break;
}
case SheetType::StyleAttr: {
if (!level->mIsImportant) {
// First time through, we handle the non-!important rule.
nsHTMLCSSStyleSheet* ruleProcessor =
static_cast<nsHTMLCSSStyleSheet*>(
mRuleProcessors[SheetType::StyleAttr].get());
if (ruleProcessor) {
lastScopedRN = ruleWalker.CurrentNode();
if (aPseudoType ==
nsCSSPseudoElements::ePseudo_NotPseudoElement) {
ruleProcessor->ElementRulesMatching(PresContext(),
aElement,
&ruleWalker);
} else if (aPseudoType <
nsCSSPseudoElements::ePseudo_PseudoElementCount &&
nsCSSPseudoElements::
PseudoElementSupportsStyleAttribute(aPseudoType)) {
ruleProcessor->PseudoElementRulesMatching(aPseudoElement,
aPseudoType,
&ruleWalker);
}
lastStyleAttrRN = ruleWalker.CurrentNode();
haveImportantStyleAttrRules =
!ruleWalker.GetCheckForImportantRules();
}
} else {
// Second time through, we handle the !important rule(s).
if (haveImportantStyleAttrRules) {
AddImportantRules(lastStyleAttrRN, lastScopedRN, &ruleWalker);
}
}
break;
}
default:
MOZ_ASSERT(false, "unexpected result from gCascadeLevels lookup");
break;
}
}
while (rulesIndex != 0) {
--rulesIndex;
const RuleNodeInfo& ruleInfo = rules[rulesIndex];
if (ruleInfo.mLevel != level->mLevel ||
ruleInfo.mIsImportant != level->mIsImportant) {
++rulesIndex;
break;
}
if (!doReplace) {
ruleWalker.ForwardOnPossiblyCSSRule(ruleInfo.mRule);
if (ruleInfo.mIsAnimationRule) {
ruleWalker.CurrentNode()->SetIsAnimationRule();
}
}
}
}
NS_ASSERTION(rulesIndex == 0,
"rules are in incorrect cascading order, "
"which means we replaced them incorrectly");
return ruleWalker.CurrentNode();
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleWithReplacement(Element* aElement,
Element* aPseudoElement,
nsStyleContext* aNewParentContext,
nsStyleContext* aOldStyleContext,
nsRestyleHint aReplacements,
uint32_t aFlags)
{
nsRuleNode* ruleNode =
RuleNodeWithReplacement(aElement, aPseudoElement,
aOldStyleContext->RuleNode(),
aOldStyleContext->GetPseudoType(), aReplacements);
nsRuleNode* visitedRuleNode = nullptr;
nsStyleContext* oldStyleIfVisited = aOldStyleContext->GetStyleIfVisited();
if (oldStyleIfVisited) {
if (oldStyleIfVisited->RuleNode() == aOldStyleContext->RuleNode()) {
visitedRuleNode = ruleNode;
} else {
visitedRuleNode =
RuleNodeWithReplacement(aElement, aPseudoElement,
oldStyleIfVisited->RuleNode(),
oldStyleIfVisited->GetPseudoType(),
aReplacements);
}
}
uint32_t flags = eNoFlags;
if (aOldStyleContext->IsLinkContext()) {
flags |= eIsLink;
// GetContext handles propagating RelevantLinkVisited state from the
// parent in non-link cases; all we need to pass in is if this link
// is visited.
if (aOldStyleContext->RelevantLinkVisited()) {
flags |= eIsVisitedLink;
}
}
nsCSSPseudoElements::Type pseudoType = aOldStyleContext->GetPseudoType();
Element* elementForAnimation = nullptr;
if (!(aFlags & eSkipStartingAnimations) &&
(pseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement ||
pseudoType == nsCSSPseudoElements::ePseudo_before ||
pseudoType == nsCSSPseudoElements::ePseudo_after)) {
// We want to compute a correct elementForAnimation to pass in
// because at this point the parameter is more than just the element
// for animation; it's also used for the SetBodyTextColor call when
// it's the body element.
// However, we only want to set the flag to call CheckAnimationRule
// if we're dealing with a replacement (such as style attribute
// replacement) that could lead to the animation property changing,
// and we explicitly do NOT want to call CheckAnimationRule when
// we're trying to do an animation-only update.
if (aReplacements & ~(eRestyle_CSSTransitions | eRestyle_CSSAnimations)) {
flags |= eDoAnimation;
}
elementForAnimation = aElement;
NS_ASSERTION(pseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement ||
!elementForAnimation->GetPrimaryFrame() ||
elementForAnimation->GetPrimaryFrame()->StyleContext()->
GetPseudoType() ==
nsCSSPseudoElements::ePseudo_NotPseudoElement,
"aElement should be the element and not the pseudo-element");
}
if (aElement && aElement->IsRootOfAnonymousSubtree()) {
// For anonymous subtree roots, don't tweak "display" value based on whether
// or not the parent is styled as a flex/grid container. (If the parent
// has anonymous-subtree kids, then we know it's not actually going to get
// a flex/grid container frame, anyway.)
flags |= eSkipParentDisplayBasedStyleFixup;
}
return GetContext(aNewParentContext, ruleNode, visitedRuleNode,
aOldStyleContext->GetPseudo(), pseudoType,
elementForAnimation, flags);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleWithoutAnimation(dom::Element* aTarget,
nsStyleContext* aStyleContext,
nsRestyleHint aWhichToRemove)
{
#ifdef DEBUG
nsCSSPseudoElements::Type pseudoType = aStyleContext->GetPseudoType();
#endif
MOZ_ASSERT(pseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement ||
pseudoType == nsCSSPseudoElements::ePseudo_before ||
pseudoType == nsCSSPseudoElements::ePseudo_after,
"unexpected type for animations");
RestyleManager* restyleManager = PresContext()->RestyleManager();
bool oldSkipAnimationRules = restyleManager->SkipAnimationRules();
restyleManager->SetSkipAnimationRules(true);
RefPtr<nsStyleContext> result =
ResolveStyleWithReplacement(aTarget, nullptr, aStyleContext->GetParent(),
aStyleContext, aWhichToRemove,
eSkipStartingAnimations);
restyleManager->SetSkipAnimationRules(oldSkipAnimationRules);
return result.forget();
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleForNonElement(nsStyleContext* aParentContext)
{
return GetContext(aParentContext, mRuleTree, nullptr,
nsCSSAnonBoxes::mozNonElement,
nsCSSPseudoElements::ePseudo_AnonBox, nullptr,
eNoFlags);
}
void
nsStyleSet::WalkRestrictionRule(nsCSSPseudoElements::Type aPseudoType,
nsRuleWalker* aRuleWalker)
{
// This needs to match GetPseudoRestriction in nsRuleNode.cpp.
aRuleWalker->SetLevel(SheetType::Agent, false, false);
if (aPseudoType == nsCSSPseudoElements::ePseudo_firstLetter)
aRuleWalker->Forward(mFirstLetterRule);
else if (aPseudoType == nsCSSPseudoElements::ePseudo_firstLine)
aRuleWalker->Forward(mFirstLineRule);
else if (aPseudoType == nsCSSPseudoElements::ePseudo_mozPlaceholder)
aRuleWalker->Forward(mPlaceholderRule);
}
void
nsStyleSet::WalkDisableTextZoomRule(Element* aElement, nsRuleWalker* aRuleWalker)
{
aRuleWalker->SetLevel(SheetType::Agent, false, false);
if (aElement->IsSVGElement(nsGkAtoms::text))
aRuleWalker->Forward(mDisableTextZoomStyleRule);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolvePseudoElementStyle(Element* aParentElement,
nsCSSPseudoElements::Type aType,
nsStyleContext* aParentContext,
Element* aPseudoElement)
{
NS_ENSURE_FALSE(mInShutdown, nullptr);
NS_ASSERTION(aType < nsCSSPseudoElements::ePseudo_PseudoElementCount,
"must have pseudo element type");
NS_ASSERTION(aParentElement, "Must have parent element");
nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled);
TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited,
aParentElement->OwnerDoc());
InitStyleScopes(treeContext, aParentElement);
PseudoElementRuleProcessorData data(PresContext(), aParentElement,
&ruleWalker, aType, treeContext,
aPseudoElement);
WalkRestrictionRule(aType, &ruleWalker);
FileRules(EnumRulesMatching<PseudoElementRuleProcessorData>, &data,
aParentElement, &ruleWalker);
nsRuleNode *ruleNode = ruleWalker.CurrentNode();
nsRuleNode *visitedRuleNode = nullptr;
if (treeContext.HaveRelevantLink()) {
treeContext.ResetForVisitedMatching();
ruleWalker.Reset();
WalkRestrictionRule(aType, &ruleWalker);
FileRules(EnumRulesMatching<PseudoElementRuleProcessorData>, &data,
aParentElement, &ruleWalker);
visitedRuleNode = ruleWalker.CurrentNode();
}
// For pseudos, |data.IsLink()| being true means that
// our parent node is a link.
uint32_t flags = eNoFlags;
if (aType == nsCSSPseudoElements::ePseudo_before ||
aType == nsCSSPseudoElements::ePseudo_after) {
flags |= eDoAnimation;
} else {
// Flex and grid containers don't expect to have any pseudo-element children
// aside from ::before and ::after. So if we have such a child, we're not
// actually in a flex/grid container, and we should skip flex/grid item
// style fixup.
flags |= eSkipParentDisplayBasedStyleFixup;
}
return GetContext(aParentContext, ruleNode, visitedRuleNode,
nsCSSPseudoElements::GetPseudoAtom(aType), aType,
aParentElement, flags);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ProbePseudoElementStyle(Element* aParentElement,
nsCSSPseudoElements::Type aType,
nsStyleContext* aParentContext)
{
TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited,
aParentElement->OwnerDoc());
InitStyleScopes(treeContext, aParentElement);
return ProbePseudoElementStyle(aParentElement, aType, aParentContext,
treeContext);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ProbePseudoElementStyle(Element* aParentElement,
nsCSSPseudoElements::Type aType,
nsStyleContext* aParentContext,
TreeMatchContext& aTreeMatchContext,
Element* aPseudoElement)
{
NS_ENSURE_FALSE(mInShutdown, nullptr);
NS_ASSERTION(aType < nsCSSPseudoElements::ePseudo_PseudoElementCount,
"must have pseudo element type");
NS_ASSERTION(aParentElement, "aParentElement must not be null");
nsIAtom* pseudoTag = nsCSSPseudoElements::GetPseudoAtom(aType);
nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled);
aTreeMatchContext.ResetForUnvisitedMatching();
PseudoElementRuleProcessorData data(PresContext(), aParentElement,
&ruleWalker, aType, aTreeMatchContext,
aPseudoElement);
WalkRestrictionRule(aType, &ruleWalker);
// not the root if there was a restriction rule
nsRuleNode *adjustedRoot = ruleWalker.CurrentNode();
FileRules(EnumRulesMatching<PseudoElementRuleProcessorData>, &data,
aParentElement, &ruleWalker);
nsRuleNode *ruleNode = ruleWalker.CurrentNode();
if (ruleNode == adjustedRoot) {
return nullptr;
}
nsRuleNode *visitedRuleNode = nullptr;
if (aTreeMatchContext.HaveRelevantLink()) {
aTreeMatchContext.ResetForVisitedMatching();
ruleWalker.Reset();
WalkRestrictionRule(aType, &ruleWalker);
FileRules(EnumRulesMatching<PseudoElementRuleProcessorData>, &data,
aParentElement, &ruleWalker);
visitedRuleNode = ruleWalker.CurrentNode();
}
// For pseudos, |data.IsLink()| being true means that
// our parent node is a link.
uint32_t flags = eNoFlags;
if (aType == nsCSSPseudoElements::ePseudo_before ||
aType == nsCSSPseudoElements::ePseudo_after) {
flags |= eDoAnimation;
} else {
// Flex and grid containers don't expect to have any pseudo-element children
// aside from ::before and ::after. So if we have such a child, we're not
// actually in a flex/grid container, and we should skip flex/grid item
// style fixup.
flags |= eSkipParentDisplayBasedStyleFixup;
}
RefPtr<nsStyleContext> result =
GetContext(aParentContext, ruleNode, visitedRuleNode,
pseudoTag, aType,
aParentElement, flags);
// For :before and :after pseudo-elements, having display: none or no
// 'content' property is equivalent to not having the pseudo-element
// at all.
if (result &&
(pseudoTag == nsCSSPseudoElements::before ||
pseudoTag == nsCSSPseudoElements::after)) {
const nsStyleDisplay *display = result->StyleDisplay();
const nsStyleContent *content = result->StyleContent();
// XXXldb What is contentCount for |content: ""|?
if (display->mDisplay == NS_STYLE_DISPLAY_NONE ||
content->ContentCount() == 0) {
result = nullptr;
}
}
return result.forget();
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveAnonymousBoxStyle(nsIAtom* aPseudoTag,
nsStyleContext* aParentContext,
uint32_t aFlags)
{
NS_ENSURE_FALSE(mInShutdown, nullptr);
#ifdef DEBUG
bool isAnonBox = nsCSSAnonBoxes::IsAnonBox(aPseudoTag)
#ifdef MOZ_XUL
&& !nsCSSAnonBoxes::IsTreePseudoElement(aPseudoTag)
#endif
;
NS_PRECONDITION(isAnonBox, "Unexpected pseudo");
#endif
nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled);
AnonBoxRuleProcessorData data(PresContext(), aPseudoTag, &ruleWalker);
FileRules(EnumRulesMatching<AnonBoxRuleProcessorData>, &data, nullptr,
&ruleWalker);
if (aPseudoTag == nsCSSAnonBoxes::pageContent) {
// Add any @page rules that are specified.
nsTArray<nsCSSPageRule*> rules;
nsTArray<css::ImportantStyleData*> importantRules;
AppendPageRules(rules);
for (uint32_t i = 0, i_end = rules.Length(); i != i_end; ++i) {
css::Declaration* declaration = rules[i]->Declaration();
declaration->SetImmutable();
ruleWalker.Forward(declaration);
css::ImportantStyleData* importantRule =
declaration->GetImportantStyleData();
if (importantRule) {
importantRules.AppendElement(importantRule);
}
}
for (uint32_t i = 0, i_end = importantRules.Length(); i != i_end; ++i) {
ruleWalker.Forward(importantRules[i]);
}
}
return GetContext(aParentContext, ruleWalker.CurrentNode(), nullptr,
aPseudoTag, nsCSSPseudoElements::ePseudo_AnonBox,
nullptr, aFlags);
}
#ifdef MOZ_XUL
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveXULTreePseudoStyle(Element* aParentElement,
nsIAtom* aPseudoTag,
nsStyleContext* aParentContext,
nsICSSPseudoComparator* aComparator)
{
NS_ENSURE_FALSE(mInShutdown, nullptr);
NS_ASSERTION(aPseudoTag, "must have pseudo tag");
NS_ASSERTION(nsCSSAnonBoxes::IsTreePseudoElement(aPseudoTag),
"Unexpected pseudo");
nsRuleWalker ruleWalker(mRuleTree, mAuthorStyleDisabled);
TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited,
aParentElement->OwnerDoc());
InitStyleScopes(treeContext, aParentElement);
XULTreeRuleProcessorData data(PresContext(), aParentElement, &ruleWalker,
aPseudoTag, aComparator, treeContext);
FileRules(EnumRulesMatching<XULTreeRuleProcessorData>, &data, aParentElement,
&ruleWalker);
nsRuleNode *ruleNode = ruleWalker.CurrentNode();
nsRuleNode *visitedRuleNode = nullptr;
if (treeContext.HaveRelevantLink()) {
treeContext.ResetForVisitedMatching();
ruleWalker.Reset();
FileRules(EnumRulesMatching<XULTreeRuleProcessorData>, &data,
aParentElement, &ruleWalker);
visitedRuleNode = ruleWalker.CurrentNode();
}
return GetContext(aParentContext, ruleNode, visitedRuleNode,
// For pseudos, |data.IsLink()| being true means that
// our parent node is a link.
aPseudoTag, nsCSSPseudoElements::ePseudo_XULTree,
nullptr, eNoFlags);
}
#endif
bool
nsStyleSet::AppendFontFaceRules(nsTArray<nsFontFaceRuleContainer>& aArray)
{
NS_ENSURE_FALSE(mInShutdown, false);
NS_ASSERTION(mBatching == 0, "rule processors out of date");
nsPresContext* presContext = PresContext();
for (uint32_t i = 0; i < ArrayLength(gCSSSheetTypes); ++i) {
if (gCSSSheetTypes[i] == SheetType::ScopedDoc)
continue;
nsCSSRuleProcessor *ruleProc = static_cast<nsCSSRuleProcessor*>
(mRuleProcessors[gCSSSheetTypes[i]].get());
if (ruleProc && !ruleProc->AppendFontFaceRules(presContext, aArray))
return false;
}
return true;
}
nsCSSKeyframesRule*
nsStyleSet::KeyframesRuleForName(const nsString& aName)
{
NS_ENSURE_FALSE(mInShutdown, nullptr);
NS_ASSERTION(mBatching == 0, "rule processors out of date");
nsPresContext* presContext = PresContext();
for (uint32_t i = ArrayLength(gCSSSheetTypes); i-- != 0; ) {
if (gCSSSheetTypes[i] == SheetType::ScopedDoc)
continue;
nsCSSRuleProcessor *ruleProc = static_cast<nsCSSRuleProcessor*>
(mRuleProcessors[gCSSSheetTypes[i]].get());
if (!ruleProc)
continue;
nsCSSKeyframesRule* result =
ruleProc->KeyframesRuleForName(presContext, aName);
if (result)
return result;
}
return nullptr;
}
nsCSSCounterStyleRule*
nsStyleSet::CounterStyleRuleForName(const nsAString& aName)
{
NS_ENSURE_FALSE(mInShutdown, nullptr);
NS_ASSERTION(mBatching == 0, "rule processors out of date");
nsPresContext* presContext = PresContext();
for (uint32_t i = ArrayLength(gCSSSheetTypes); i-- != 0; ) {
if (gCSSSheetTypes[i] == SheetType::ScopedDoc)
continue;
nsCSSRuleProcessor *ruleProc = static_cast<nsCSSRuleProcessor*>
(mRuleProcessors[gCSSSheetTypes[i]].get());
if (!ruleProc)
continue;
nsCSSCounterStyleRule *result =
ruleProc->CounterStyleRuleForName(presContext, aName);
if (result)
return result;
}
return nullptr;
}
bool
nsStyleSet::AppendFontFeatureValuesRules(
nsTArray<nsCSSFontFeatureValuesRule*>& aArray)
{
NS_ENSURE_FALSE(mInShutdown, false);
NS_ASSERTION(mBatching == 0, "rule processors out of date");
nsPresContext* presContext = PresContext();
for (uint32_t i = 0; i < ArrayLength(gCSSSheetTypes); ++i) {
nsCSSRuleProcessor *ruleProc = static_cast<nsCSSRuleProcessor*>
(mRuleProcessors[gCSSSheetTypes[i]].get());
if (ruleProc &&
!ruleProc->AppendFontFeatureValuesRules(presContext, aArray))
{
return false;
}
}
return true;
}
already_AddRefed<gfxFontFeatureValueSet>
nsStyleSet::GetFontFeatureValuesLookup()
{
if (mInitFontFeatureValuesLookup) {
mInitFontFeatureValuesLookup = false;
nsTArray<nsCSSFontFeatureValuesRule*> rules;
AppendFontFeatureValuesRules(rules);
mFontFeatureValuesLookup = new gfxFontFeatureValueSet();
uint32_t i, numRules = rules.Length();
for (i = 0; i < numRules; i++) {
nsCSSFontFeatureValuesRule *rule = rules[i];
const nsTArray<FontFamilyName>& familyList = rule->GetFamilyList().GetFontlist();
const nsTArray<gfxFontFeatureValueSet::FeatureValues>&
featureValues = rule->GetFeatureValues();
// for each family
size_t f, numFam;
numFam = familyList.Length();
for (f = 0; f < numFam; f++) {
mFontFeatureValuesLookup->AddFontFeatureValues(familyList[f].mName,
featureValues);
}
}
}
RefPtr<gfxFontFeatureValueSet> lookup = mFontFeatureValuesLookup;
return lookup.forget();
}
bool
nsStyleSet::AppendPageRules(nsTArray<nsCSSPageRule*>& aArray)
{
NS_ENSURE_FALSE(mInShutdown, false);
NS_ASSERTION(mBatching == 0, "rule processors out of date");
nsPresContext* presContext = PresContext();
for (uint32_t i = 0; i < ArrayLength(gCSSSheetTypes); ++i) {
if (gCSSSheetTypes[i] == SheetType::ScopedDoc)
continue;
nsCSSRuleProcessor* ruleProc = static_cast<nsCSSRuleProcessor*>
(mRuleProcessors[gCSSSheetTypes[i]].get());
if (ruleProc && !ruleProc->AppendPageRules(presContext, aArray))
return false;
}
return true;
}
void
nsStyleSet::BeginShutdown()
{
mInShutdown = 1;
mRoots.Clear(); // no longer valid, since we won't keep it up to date
}
void
nsStyleSet::Shutdown()
{
mRuleTree->Destroy();
mRuleTree = nullptr;
// We can have old rule trees either because:
// (1) we failed the assertions in EndReconstruct, or
// (2) we're shutting down within a reconstruct (see bug 462392)
for (uint32_t i = mOldRuleTrees.Length(); i > 0; ) {
--i;
mOldRuleTrees[i]->Destroy();
}
mOldRuleTrees.Clear();
}
static const uint32_t kGCInterval = 300;
void
nsStyleSet::NotifyStyleContextDestroyed(nsStyleContext* aStyleContext)
{
if (mInShutdown)
return;
// Remove style contexts from mRoots even if mOldRuleTree is non-null. This
// could be a style context from the new ruletree!
if (!aStyleContext->GetParent()) {
mRoots.RemoveElement(aStyleContext);
}
if (mInReconstruct)
return;
if (mUnusedRuleNodeCount >= kGCInterval) {
GCRuleTrees();
}
}
void
nsStyleSet::GCRuleTrees()
{
mUnusedRuleNodeCount = 0;
// Mark the style context tree by marking all style contexts which
// have no parent, which will mark all descendants. This will reach
// style contexts in the undisplayed map and "additional style
// contexts" since they are descendants of the roots.
for (int32_t i = mRoots.Length() - 1; i >= 0; --i) {
mRoots[i]->Mark();
}
// Sweep the rule tree.
#ifdef DEBUG
bool deleted =
#endif
mRuleTree->Sweep();
NS_ASSERTION(!deleted, "Root node must not be gc'd");
// Sweep the old rule trees.
for (uint32_t i = mOldRuleTrees.Length(); i > 0; ) {
--i;
if (mOldRuleTrees[i]->Sweep()) {
// It was deleted, as it should be.
mOldRuleTrees.RemoveElementAt(i);
} else {
NS_NOTREACHED("old rule tree still referenced");
}
}
}
already_AddRefed<nsStyleContext>
nsStyleSet::ReparentStyleContext(nsStyleContext* aStyleContext,
nsStyleContext* aNewParentContext,
Element* aElement)
{
MOZ_ASSERT(aStyleContext, "aStyleContext must not be null");
// This short-circuit is OK because we don't call TryStartingTransition
// during style reresolution if the style context pointer hasn't changed.
if (aStyleContext->GetParent() == aNewParentContext) {
RefPtr<nsStyleContext> ret = aStyleContext;
return ret.forget();
}
nsIAtom* pseudoTag = aStyleContext->GetPseudo();
nsCSSPseudoElements::Type pseudoType = aStyleContext->GetPseudoType();
nsRuleNode* ruleNode = aStyleContext->RuleNode();
NS_ASSERTION(!PresContext()->RestyleManager()->SkipAnimationRules(),
"we no longer handle SkipAnimationRules()");
nsRuleNode* visitedRuleNode = nullptr;
nsStyleContext* visitedContext = aStyleContext->GetStyleIfVisited();
// Reparenting a style context just changes where we inherit from,
// not what rules we match or what our DOM looks like. In
// particular, it doesn't change whether this is a style context for
// a link.
if (visitedContext) {
visitedRuleNode = visitedContext->RuleNode();
}
uint32_t flags = eNoFlags;
if (aStyleContext->IsLinkContext()) {
flags |= eIsLink;
// GetContext handles propagating RelevantLinkVisited state from the
// parent in non-link cases; all we need to pass in is if this link
// is visited.
if (aStyleContext->RelevantLinkVisited()) {
flags |= eIsVisitedLink;
}
}
if (pseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement ||
pseudoType == nsCSSPseudoElements::ePseudo_before ||
pseudoType == nsCSSPseudoElements::ePseudo_after) {
flags |= eDoAnimation;
}
if (aElement && aElement->IsRootOfAnonymousSubtree()) {
// For anonymous subtree roots, don't tweak "display" value based on whether
// or not the parent is styled as a flex/grid container. (If the parent
// has anonymous-subtree kids, then we know it's not actually going to get
// a flex/grid container frame, anyway.)
flags |= eSkipParentDisplayBasedStyleFixup;
}
return GetContext(aNewParentContext, ruleNode, visitedRuleNode,
pseudoTag, pseudoType,
aElement, flags);
}
struct MOZ_STACK_CLASS StatefulData : public StateRuleProcessorData {
StatefulData(nsPresContext* aPresContext, Element* aElement,
EventStates aStateMask, TreeMatchContext& aTreeMatchContext)
: StateRuleProcessorData(aPresContext, aElement, aStateMask,
aTreeMatchContext),
mHint(nsRestyleHint(0))
{}
nsRestyleHint mHint;
};
struct MOZ_STACK_CLASS StatefulPseudoElementData : public PseudoElementStateRuleProcessorData {
StatefulPseudoElementData(nsPresContext* aPresContext, Element* aElement,
EventStates aStateMask, nsCSSPseudoElements::Type aPseudoType,
TreeMatchContext& aTreeMatchContext, Element* aPseudoElement)
: PseudoElementStateRuleProcessorData(aPresContext, aElement, aStateMask,
aPseudoType, aTreeMatchContext,
aPseudoElement),
mHint(nsRestyleHint(0))
{}
nsRestyleHint mHint;
};
static bool SheetHasDocumentStateStyle(nsIStyleRuleProcessor* aProcessor,
void *aData)
{
StatefulData* data = (StatefulData*)aData;
if (aProcessor->HasDocumentStateDependentStyle(data)) {
data->mHint = eRestyle_Self;
return false; // don't continue
}
return true; // continue
}
// Test if style is dependent on a document state.
bool
nsStyleSet::HasDocumentStateDependentStyle(nsIContent* aContent,
EventStates aStateMask)
{
if (!aContent || !aContent->IsElement())
return false;
TreeMatchContext treeContext(false, nsRuleWalker::eLinksVisitedOrUnvisited,
aContent->OwnerDoc());
InitStyleScopes(treeContext, aContent->AsElement());
StatefulData data(PresContext(), aContent->AsElement(), aStateMask,
treeContext);
WalkRuleProcessors(SheetHasDocumentStateStyle, &data, true);
return data.mHint != 0;
}
static bool SheetHasStatefulStyle(nsIStyleRuleProcessor* aProcessor,
void *aData)
{
StatefulData* data = (StatefulData*)aData;
nsRestyleHint hint = aProcessor->HasStateDependentStyle(data);
data->mHint = nsRestyleHint(data->mHint | hint);
return true; // continue
}
static bool SheetHasStatefulPseudoElementStyle(nsIStyleRuleProcessor* aProcessor,
void *aData)
{
StatefulPseudoElementData* data = (StatefulPseudoElementData*)aData;
nsRestyleHint hint = aProcessor->HasStateDependentStyle(data);
data->mHint = nsRestyleHint(data->mHint | hint);
return true; // continue
}
// Test if style is dependent on content state
nsRestyleHint
nsStyleSet::HasStateDependentStyle(Element* aElement,
EventStates aStateMask)
{
TreeMatchContext treeContext(false, nsRuleWalker::eLinksVisitedOrUnvisited,
aElement->OwnerDoc());
InitStyleScopes(treeContext, aElement);
StatefulData data(PresContext(), aElement, aStateMask, treeContext);
WalkRuleProcessors(SheetHasStatefulStyle, &data, false);
return data.mHint;
}
nsRestyleHint
nsStyleSet::HasStateDependentStyle(Element* aElement,
nsCSSPseudoElements::Type aPseudoType,
Element* aPseudoElement,
EventStates aStateMask)
{
TreeMatchContext treeContext(false, nsRuleWalker::eLinksVisitedOrUnvisited,
aElement->OwnerDoc());
InitStyleScopes(treeContext, aElement);
StatefulPseudoElementData data(PresContext(), aElement, aStateMask,
aPseudoType, treeContext, aPseudoElement);
WalkRuleProcessors(SheetHasStatefulPseudoElementStyle, &data, false);
return data.mHint;
}
struct MOZ_STACK_CLASS AttributeData : public AttributeRuleProcessorData {
AttributeData(nsPresContext* aPresContext, Element* aElement,
int32_t aNameSpaceID, nsIAtom* aAttribute, int32_t aModType,
bool aAttrHasChanged, const nsAttrValue* aOtherValue,
TreeMatchContext& aTreeMatchContext)
: AttributeRuleProcessorData(aPresContext, aElement, aNameSpaceID,
aAttribute, aModType, aAttrHasChanged,
aOtherValue, aTreeMatchContext),
mHint(nsRestyleHint(0))
{}
nsRestyleHint mHint;
RestyleHintData mHintData;
};
static bool
SheetHasAttributeStyle(nsIStyleRuleProcessor* aProcessor, void *aData)
{
AttributeData* data = (AttributeData*)aData;
nsRestyleHint hint =
aProcessor->HasAttributeDependentStyle(data, data->mHintData);
data->mHint = nsRestyleHint(data->mHint | hint);
return true; // continue
}
// Test if style is dependent on content state
nsRestyleHint
nsStyleSet::HasAttributeDependentStyle(Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
bool aAttrHasChanged,
const nsAttrValue* aOtherValue,
mozilla::RestyleHintData&
aRestyleHintDataResult)
{
TreeMatchContext treeContext(false, nsRuleWalker::eLinksVisitedOrUnvisited,
aElement->OwnerDoc());
InitStyleScopes(treeContext, aElement);
AttributeData data(PresContext(), aElement, aNameSpaceID, aAttribute,
aModType, aAttrHasChanged, aOtherValue, treeContext);
WalkRuleProcessors(SheetHasAttributeStyle, &data, false);
if (!(data.mHint & eRestyle_Subtree)) {
// No point keeping the list of selectors around if we are going to
// restyle the whole subtree unconditionally.
aRestyleHintDataResult = Move(data.mHintData);
}
return data.mHint;
}
bool
nsStyleSet::MediumFeaturesChanged()
{
NS_ASSERTION(mBatching == 0, "rule processors out of date");
// We can't use WalkRuleProcessors without a content node.
nsPresContext* presContext = PresContext();
bool stylesChanged = false;
for (nsIStyleRuleProcessor* processor : mRuleProcessors) {
if (!processor) {
continue;
}
bool thisChanged = processor->MediumFeaturesChanged(presContext);
stylesChanged = stylesChanged || thisChanged;
}
for (nsIStyleRuleProcessor* processor : mScopedDocSheetRuleProcessors) {
bool thisChanged = processor->MediumFeaturesChanged(presContext);
stylesChanged = stylesChanged || thisChanged;
}
if (mBindingManager) {
bool thisChanged = false;
mBindingManager->MediumFeaturesChanged(presContext, &thisChanged);
stylesChanged = stylesChanged || thisChanged;
}
return stylesChanged;
}
bool
nsStyleSet::EnsureUniqueInnerOnCSSSheets()
{
nsAutoTArray<CSSStyleSheet*, 32> queue;
for (SheetType type : gCSSSheetTypes) {
for (CSSStyleSheet* sheet : mSheets[type]) {
queue.AppendElement(sheet);
}
}
if (mBindingManager) {
mBindingManager->AppendAllSheets(queue);
}
while (!queue.IsEmpty()) {
uint32_t idx = queue.Length() - 1;
CSSStyleSheet* sheet = queue[idx];
queue.RemoveElementAt(idx);
sheet->EnsureUniqueInner();
// Enqueue all the sheet's children.
sheet->AppendAllChildSheets(queue);
}
bool res = mNeedsRestyleAfterEnsureUniqueInner;
mNeedsRestyleAfterEnsureUniqueInner = false;
return res;
}
nsIStyleRule*
nsStyleSet::InitialStyleRule()
{
if (!mInitialStyleRule) {
mInitialStyleRule = new nsInitialStyleRule;
}
return mInitialStyleRule;
}
bool
nsStyleSet::HasRuleProcessorUsedByMultipleStyleSets(SheetType aSheetType)
{
MOZ_ASSERT(size_t(aSheetType) < ArrayLength(mRuleProcessors));
if (!IsCSSSheetType(aSheetType) || !mRuleProcessors[aSheetType]) {
return false;
}
nsCSSRuleProcessor* rp =
static_cast<nsCSSRuleProcessor*>(mRuleProcessors[aSheetType].get());
return rp->IsUsedByMultipleStyleSets();
}
void
nsStyleSet::ClearSelectors()
{
// We might be called before we've done our first rule tree construction.
if (!mRuleTree) {
return;
}
PresContext()->RestyleManager()->ClearSelectors();
}
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