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gecko-dev/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 "mozilla/Util.h"
#include "nsStyleSet.h"
#include "nsNetUtil.h"
#include "nsCSSStyleSheet.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 "nsTransitionManager.h"
#include "nsAnimationManager.h"
#include "nsEventStates.h"
#include "nsStyleSheetService.h"
#include "mozilla/dom/Element.h"
#include "sampler.h"
using namespace mozilla;
using namespace mozilla::dom;
NS_IMPL_ISUPPORTS1(nsEmptyStyleRule, nsIStyleRule)
/* virtual */ void
nsEmptyStyleRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
}
#ifdef DEBUG
/* virtual */ void
nsEmptyStyleRule::List(FILE* out, int32_t aIndent) const
{
for (int32_t index = aIndent; --index >= 0; ) fputs(" ", out);
fputs("[empty style rule] {}\n", out);
}
#endif
NS_IMPL_ISUPPORTS1(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)) {
continue;
}
}
if (value->GetUnit() == eCSSUnit_Null) {
value->SetInitialValue();
}
}
}
}
}
#ifdef DEBUG
/* virtual */ void
nsInitialStyleRule::List(FILE* out, int32_t aIndent) const
{
for (int32_t index = aIndent; --index >= 0; ) fputs(" ", out);
fputs("[initial style rule] {}\n", out);
}
#endif
static const nsStyleSet::sheetType gCSSSheetTypes[] = {
nsStyleSet::eAgentSheet,
nsStyleSet::eUserSheet,
nsStyleSet::eDocSheet,
nsStyleSet::eScopedDocSheet,
nsStyleSet::eOverrideSheet
};
nsStyleSet::nsStyleSet()
: mRuleTree(nullptr),
mBatching(0),
mInShutdown(false),
mAuthorStyleDisabled(false),
mInReconstruct(false),
mDirty(0),
mUnusedRuleNodeCount(0)
{
}
size_t
nsStyleSet::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
size_t n = aMallocSizeOf(this);
for (int i = 0; i < eSheetTypeCount; i++) {
if (mRuleProcessors[i]) {
n += mRuleProcessors[i]->SizeOfIncludingThis(aMallocSizeOf);
}
n += mSheets[i].SizeOfExcludingThis(nullptr, aMallocSizeOf);
}
for (uint32_t i = 0; i < mScopedDocSheetRuleProcessors.Length(); i++) {
n += mScopedDocSheetRuleProcessors[i]->SizeOfIncludingThis(aMallocSizeOf);
}
n += mScopedDocSheetRuleProcessors.SizeOfExcludingThis(aMallocSizeOf);
n += mRoots.SizeOfExcludingThis(aMallocSizeOf);
n += mOldRuleTrees.SizeOfExcludingThis(aMallocSizeOf);
return n;
}
nsresult
nsStyleSet::Init(nsPresContext *aPresContext)
{
mFirstLineRule = new nsEmptyStyleRule;
mFirstLetterRule = new nsEmptyStyleRule;
mPlaceholderRule = new nsEmptyStyleRule;
mRuleTree = nsRuleNode::CreateRootNode(aPresContext);
GatherRuleProcessors(eAnimationSheet);
GatherRuleProcessors(eTransitionSheet);
return NS_OK;
}
nsresult
nsStyleSet::BeginReconstruct()
{
NS_ASSERTION(!mInReconstruct, "Unmatched begin/end?");
NS_ASSERTION(mRuleTree, "Reconstructing before first construction?");
// Create a new rule tree root
nsRuleNode* newTree =
nsRuleNode::CreateRootNode(mRuleTree->PresContext());
if (!newTree)
return NS_ERROR_OUT_OF_MEMORY;
// 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) {
nsRuleNode *n = mRoots[i]->RuleNode();
while (n->GetParent()) {
n = n->GetParent();
}
// 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(n == 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();
}
void
nsStyleSet::SetQuirkStyleSheet(nsIStyleSheet* aQuirkStyleSheet)
{
NS_ASSERTION(aQuirkStyleSheet, "Must have quirk sheet if this is called");
NS_ASSERTION(!mQuirkStyleSheet, "Multiple calls to SetQuirkStyleSheet?");
NS_ASSERTION(mSheets[eAgentSheet].IndexOf(aQuirkStyleSheet) != -1,
"Quirk style sheet not one of our agent sheets?");
mQuirkStyleSheet = aQuirkStyleSheet;
}
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
{
nsCSSStyleSheet* 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<nsCSSStyleSheet*>& aSheets)
{
uint32_t n = aSheets.Length();
if (n == 1) {
return;
}
ScopeDepthCache cache;
cache.Init();
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)
{
mRuleProcessors[aType] = nullptr;
if (aType == eScopedDocSheet) {
for (uint32_t i = 0; i < mScopedDocSheetRuleProcessors.Length(); i++) {
nsIStyleRuleProcessor* processor = mScopedDocSheetRuleProcessors[i].get();
Element* scope =
static_cast<nsCSSRuleProcessor*>(processor)->GetScopeElement();
scope->ClearIsScopedStyleRoot();
}
mScopedDocSheetRuleProcessors.Clear();
}
if (mAuthorStyleDisabled && (aType == eDocSheet ||
aType == eScopedDocSheet ||
aType == ePresHintSheet ||
aType == eStyleAttrSheet)) {
//don't regather if this level is disabled
return NS_OK;
}
if (aType == eAnimationSheet) {
// We have no sheet for the animations level; just a rule
// processor. (XXX: We should probably do this for the other
// non-CSS levels too!)
mRuleProcessors[aType] = PresContext()->AnimationManager();
return NS_OK;
}
if (aType == eTransitionSheet) {
// We have no sheet for the transitions level; just a rule
// processor. (XXX: We should probably do this for the other
// non-CSS levels too!)
mRuleProcessors[aType] = PresContext()->TransitionManager();
return NS_OK;
}
if (aType == eScopedDocSheet) {
// Create a rule processor for each scope.
uint32_t count = mSheets[eScopedDocSheet].Count();
if (count) {
// Gather the scoped style sheets into an array as
// nsCSSStyleSheets, and mark all of their scope elements
// as scoped style roots.
nsTArray<nsCSSStyleSheet*> sheets(count);
for (uint32_t i = 0; i < count; i++) {
nsRefPtr<nsCSSStyleSheet> sheet =
do_QueryObject(mSheets[eScopedDocSheet].ObjectAt(i));
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);
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< nsRefPtr<nsCSSStyleSheet> > sheetsForScope;
sheetsForScope.AppendElements(sheets.Elements() + start, end - start);
mScopedDocSheetRuleProcessors.AppendElement
(new nsCSSRuleProcessor(sheetsForScope, uint8_t(aType), scope));
start = end;
} while (start < count);
}
return NS_OK;
}
if (mSheets[aType].Count()) {
switch (aType) {
case eAgentSheet:
case eUserSheet:
case eDocSheet:
case eOverrideSheet: {
// levels containing CSS stylesheets (apart from eScopedDocSheet)
nsCOMArray<nsIStyleSheet>& sheets = mSheets[aType];
nsTArray<nsRefPtr<nsCSSStyleSheet> > cssSheets(sheets.Count());
for (int32_t i = 0, i_end = sheets.Count(); i < i_end; ++i) {
nsRefPtr<nsCSSStyleSheet> cssSheet = do_QueryObject(sheets[i]);
NS_ASSERTION(cssSheet, "not a CSS sheet");
cssSheets.AppendElement(cssSheet);
}
mRuleProcessors[aType] =
new nsCSSRuleProcessor(cssSheets, uint8_t(aType), nullptr);
} break;
default:
// levels containing non-CSS stylesheets
NS_ASSERTION(mSheets[aType].Count() == 1, "only one sheet per level");
mRuleProcessors[aType] = do_QueryInterface(mSheets[aType][0]);
break;
}
}
return NS_OK;
}
static bool
IsScopedStyleSheet(nsIStyleSheet* aSheet)
{
nsRefPtr<nsCSSStyleSheet> cssSheet = do_QueryObject(aSheet);
NS_ASSERTION(cssSheet, "expected aSheet to be an nsCSSStyleSheet");
return cssSheet->GetScopeElement();
}
nsresult
nsStyleSet::AppendStyleSheet(sheetType aType, nsIStyleSheet *aSheet)
{
NS_PRECONDITION(aSheet, "null arg");
NS_ASSERTION(aSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
mSheets[aType].RemoveObject(aSheet);
if (!mSheets[aType].AppendObject(aSheet))
return NS_ERROR_OUT_OF_MEMORY;
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= 1 << aType;
return NS_OK;
}
nsresult
nsStyleSet::PrependStyleSheet(sheetType aType, nsIStyleSheet *aSheet)
{
NS_PRECONDITION(aSheet, "null arg");
NS_ASSERTION(aSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
mSheets[aType].RemoveObject(aSheet);
if (!mSheets[aType].InsertObjectAt(aSheet, 0))
return NS_ERROR_OUT_OF_MEMORY;
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= 1 << aType;
return NS_OK;
}
nsresult
nsStyleSet::RemoveStyleSheet(sheetType aType, nsIStyleSheet *aSheet)
{
NS_PRECONDITION(aSheet, "null arg");
NS_ASSERTION(aSheet->IsComplete(),
"Incomplete sheet being removed from style set");
mSheets[aType].RemoveObject(aSheet);
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= 1 << aType;
return NS_OK;
}
nsresult
nsStyleSet::ReplaceSheets(sheetType aType,
const nsCOMArray<nsIStyleSheet> &aNewSheets)
{
mSheets[aType].Clear();
if (!mSheets[aType].AppendObjects(aNewSheets))
return NS_ERROR_OUT_OF_MEMORY;
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= 1 << aType;
return NS_OK;
}
nsresult
nsStyleSet::InsertStyleSheetBefore(sheetType aType, nsIStyleSheet *aNewSheet,
nsIStyleSheet *aReferenceSheet)
{
NS_PRECONDITION(aNewSheet && aReferenceSheet, "null arg");
NS_ASSERTION(aNewSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
mSheets[aType].RemoveObject(aNewSheet);
int32_t idx = mSheets[aType].IndexOf(aReferenceSheet);
if (idx < 0)
return NS_ERROR_INVALID_ARG;
if (!mSheets[aType].InsertObjectAt(aNewSheet, idx))
return NS_ERROR_OUT_OF_MEMORY;
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= 1 << aType;
return NS_OK;
}
bool
nsStyleSet::GetAuthorStyleDisabled()
{
return mAuthorStyleDisabled;
}
nsresult
nsStyleSet::SetAuthorStyleDisabled(bool aStyleDisabled)
{
if (aStyleDisabled == !mAuthorStyleDisabled) {
mAuthorStyleDisabled = aStyleDisabled;
BeginUpdate();
mDirty |= 1 << eDocSheet |
1 << ePresHintSheet |
1 << eStyleAttrSheet;
return EndUpdate();
}
return NS_OK;
}
// -------- Doc Sheets
nsresult
nsStyleSet::AddDocStyleSheet(nsIStyleSheet* aSheet, nsIDocument* aDocument)
{
NS_PRECONDITION(aSheet && aDocument, "null arg");
NS_ASSERTION(aSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
sheetType type = IsScopedStyleSheet(aSheet) ?
eScopedDocSheet :
eDocSheet;
nsCOMArray<nsIStyleSheet>& sheets = mSheets[type];
sheets.RemoveObject(aSheet);
nsStyleSheetService *sheetService = nsStyleSheetService::GetInstance();
// lowest index first
int32_t newDocIndex = aDocument->GetIndexOfStyleSheet(aSheet);
int32_t count = sheets.Count();
int32_t index;
for (index = 0; index < count; index++) {
nsIStyleSheet* sheet = sheets.ObjectAt(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 &&
((sheetService &&
sheetService->AuthorStyleSheets()->IndexOf(sheet) >= 0) ||
sheet == aDocument->FirstAdditionalAuthorSheet()))
break;
}
if (!sheets.InsertObjectAt(aSheet, index))
return NS_ERROR_OUT_OF_MEMORY;
if (!mBatching)
return GatherRuleProcessors(type);
mDirty |= 1 << type;
return NS_OK;
}
nsresult
nsStyleSet::RemoveDocStyleSheet(nsIStyleSheet *aSheet)
{
nsRefPtr<nsCSSStyleSheet> cssSheet = do_QueryObject(aSheet);
bool isScoped = cssSheet && cssSheet->GetScopeElement();
return RemoveStyleSheet(isScoped ? eScopedDocSheet : eDocSheet, 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 (int i = 0; i < eSheetTypeCount; ++i) {
if (mDirty & (1 << i)) {
nsresult rv = GatherRuleProcessors(sheetType(i));
NS_ENSURE_SUCCESS(rv, rv);
}
}
mDirty = 0;
return NS_OK;
}
void
nsStyleSet::EnableQuirkStyleSheet(bool aEnable)
{
#ifdef DEBUG
bool oldEnabled;
{
nsCOMPtr<nsIDOMCSSStyleSheet> domSheet =
do_QueryInterface(mQuirkStyleSheet);
domSheet->GetDisabled(&oldEnabled);
oldEnabled = !oldEnabled;
}
#endif
mQuirkStyleSheet->SetEnabled(aEnable);
#ifdef DEBUG
// This should always be OK, since SetEnabled should call
// ClearRuleCascades.
// Note that we can hit this codepath multiple times when document.open()
// (potentially implied) happens multiple times.
if (mRuleProcessors[eAgentSheet] && aEnable != oldEnabled) {
static_cast<nsCSSRuleProcessor*>(static_cast<nsIStyleRuleProcessor*>(
mRuleProcessors[eAgentSheet]))->AssertQuirksChangeOK();
}
#endif
}
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() == nsStyleSet::eTransitionSheet ||
aRuleNode->IsImportantRule());
}
static nsIStyleRule*
GetAnimationRule(nsRuleNode *aRuleNode)
{
nsRuleNode *n = aRuleNode;
while (IsMoreSpecificThanAnimation(n)) {
n = n->GetParent();
}
if (n->IsRoot() || n->GetLevel() != nsStyleSet::eAnimationSheet) {
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) {
NS_ABORT_IF_FALSE(n->GetRule() == aOldAnimRule, "wrong rule");
NS_ABORT_IF_FALSE(n->GetLevel() == nsStyleSet::eAnimationSheet,
"wrong level");
n = n->GetParent();
}
NS_ABORT_IF_FALSE(!IsMoreSpecificThanAnimation(n) &&
(n->IsRoot() ||
n->GetLevel() != nsStyleSet::eAnimationSheet),
"wrong level");
if (aNewAnimRule) {
n = n->Transition(aNewAnimRule, nsStyleSet::eAnimationSheet, false);
}
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;
}
nsRefPtr<nsStyleContext> result;
if (aParentContext)
result = aParentContext->FindChildWithRules(aPseudoTag, aRuleNode,
aVisitedRuleNode,
aFlags & eIsVisitedLink);
#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 & eSkipFlexItemStyleFixup);
if (!result)
return nullptr;
if (aVisitedRuleNode) {
nsRefPtr<nsStyleContext> resultIfVisited =
NS_NewStyleContext(parentIfVisited, aPseudoTag, aPseudoType,
aVisitedRuleNode,
aFlags & eSkipFlexItemStyleFixup);
if (!resultIfVisited) {
return nullptr;
}
if (!parentIfVisited) {
mRoots.AppendElement(resultIfVisited);
}
resultIfVisited->SetIsStyleIfVisited();
result->SetStyleIfVisited(resultIfVisited.forget());
bool relevantLinkVisited = (aFlags & eIsLink) ?
(aFlags & eIsVisitedLink) :
(aParentContext && aParentContext->RelevantLinkVisited());
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);
NS_ABORT_IF_FALSE(result->RuleNode() == aRuleNode,
"unexpected rule node");
NS_ABORT_IF_FALSE(!result->GetStyleIfVisited() == !aVisitedRuleNode,
"unexpected visited rule node");
NS_ABORT_IF_FALSE(!aVisitedRuleNode ||
result->GetStyleIfVisited()->RuleNode() ==
aVisitedRuleNode,
"unexpected visited rule node");
if (oldAnimRule != animRule) {
nsRuleNode *ruleNode =
ReplaceAnimationRule(aRuleNode, oldAnimRule, animRule);
nsRuleNode *visitedRuleNode = aVisitedRuleNode
? ReplaceAnimationRule(aVisitedRuleNode, oldAnimRule, animRule)
: nullptr;
result = GetContext(aParentContext, ruleNode, visitedRuleNode,
aPseudoTag, aPseudoType, nullptr,
aFlags & ~eDoAnimation);
}
}
if (aElementForAnimation && aElementForAnimation->IsHTML(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(nsRefPtr<css::StyleRule>(do_QueryObject(node->GetRule())),
"Unexpected non-CSS rule");
nsIStyleRule* impRule =
static_cast<css::StyleRule*>(node->GetRule())->GetImportantRule();
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()) {
nsRefPtr<css::StyleRule> rule(do_QueryObject(node->GetRule()));
NS_ASSERTION(rule, "Unexpected non-CSS rule");
NS_ASSERTION(!rule->GetImportantRule(), "Unexpected important rule");
}
}
void
nsStyleSet::AssertNoCSSRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode)
{
if (!aCurrLevelNode)
return;
for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode;
node = node->GetParent()) {
nsIStyleRule *rule = node->GetRule();
nsRefPtr<css::StyleRule> cssRule(do_QueryObject(rule));
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)
{
SAMPLE_LABEL("nsStyleSet", "FileRules");
// Cascading order:
// [least important]
// - UA normal rules = Agent normal
// - User normal rules = User normal
// - Presentation hints = PresHint 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(eAgentSheet, false, true);
if (mRuleProcessors[eAgentSheet])
(*aCollectorFunc)(mRuleProcessors[eAgentSheet], aData);
nsRuleNode* lastAgentRN = aRuleWalker->CurrentNode();
bool haveImportantUARules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(eUserSheet, false, true);
bool skipUserStyles =
aElement && aElement->IsInNativeAnonymousSubtree();
if (!skipUserStyles && mRuleProcessors[eUserSheet]) // NOTE: different
(*aCollectorFunc)(mRuleProcessors[eUserSheet], aData);
nsRuleNode* lastUserRN = aRuleWalker->CurrentNode();
bool haveImportantUserRules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(ePresHintSheet, false, false);
if (mRuleProcessors[ePresHintSheet])
(*aCollectorFunc)(mRuleProcessors[ePresHintSheet], aData);
nsRuleNode* lastPresHintRN = aRuleWalker->CurrentNode();
aRuleWalker->SetLevel(eDocSheet, 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[eDocSheet])
(*aCollectorFunc)(mRuleProcessors[eDocSheet], 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(eScopedDocSheet, 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(eStyleAttrSheet, false, true);
if (mRuleProcessors[eStyleAttrSheet])
(*aCollectorFunc)(mRuleProcessors[eStyleAttrSheet], aData);
nsRuleNode* lastStyleAttrRN = aRuleWalker->CurrentNode();
bool haveImportantStyleAttrRules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(eOverrideSheet, false, true);
if (mRuleProcessors[eOverrideSheet])
(*aCollectorFunc)(mRuleProcessors[eOverrideSheet], aData);
nsRuleNode* lastOvrRN = aRuleWalker->CurrentNode();
bool haveImportantOverrideRules = !aRuleWalker->GetCheckForImportantRules();
// This needs to match IsMoreSpecificThanAnimation() above.
aRuleWalker->SetLevel(eAnimationSheet, false, false);
(*aCollectorFunc)(mRuleProcessors[eAnimationSheet], aData);
if (haveAnyImportantScopedRules) {
for (uint32_t i = lastScopedRNs.Length(); i-- != 0; ) {
aRuleWalker->SetLevel(eScopedDocSheet, 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(eDocSheet, true, false);
AddImportantRules(lastDocRN, lastPresHintRN, aRuleWalker); // doc
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastDocRN, lastPresHintRN);
}
#endif
if (haveImportantStyleAttrRules) {
aRuleWalker->SetLevel(eStyleAttrSheet, true, false);
AddImportantRules(lastStyleAttrRN, lastScopedRN, aRuleWalker); // style attr
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastStyleAttrRN, lastScopedRN);
}
#endif
if (haveImportantOverrideRules) {
aRuleWalker->SetLevel(eOverrideSheet, true, false);
AddImportantRules(lastOvrRN, lastStyleAttrRN, aRuleWalker); // override
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastOvrRN, lastStyleAttrRN);
}
#endif
#ifdef DEBUG
AssertNoCSSRules(lastPresHintRN, lastUserRN);
#endif
if (haveImportantUserRules) {
aRuleWalker->SetLevel(eUserSheet, true, false);
AddImportantRules(lastUserRN, lastAgentRN, aRuleWalker); //user
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastUserRN, lastAgentRN);
}
#endif
if (haveImportantUARules) {
aRuleWalker->SetLevel(eAgentSheet, 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(eTransitionSheet, false, false);
(*aCollectorFunc)(mRuleProcessors[eTransitionSheet], 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)
{
if (mRuleProcessors[eAgentSheet])
(*aFunc)(mRuleProcessors[eAgentSheet], aData);
bool skipUserStyles = aData->mElement->IsInNativeAnonymousSubtree();
if (!skipUserStyles && mRuleProcessors[eUserSheet]) // NOTE: different
(*aFunc)(mRuleProcessors[eUserSheet], aData);
if (mRuleProcessors[ePresHintSheet])
(*aFunc)(mRuleProcessors[ePresHintSheet], 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[eDocSheet]) // NOTE: different
(*aFunc)(mRuleProcessors[eDocSheet], aData);
if (aData->mElement->IsElementInStyleScope()) {
for (uint32_t i = 0; i < mScopedDocSheetRuleProcessors.Length(); i++)
(*aFunc)(mScopedDocSheetRuleProcessors[i], aData);
}
}
if (mRuleProcessors[eStyleAttrSheet])
(*aFunc)(mRuleProcessors[eStyleAttrSheet], aData);
if (mRuleProcessors[eOverrideSheet])
(*aFunc)(mRuleProcessors[eOverrideSheet], aData);
(*aFunc)(mRuleProcessors[eAnimationSheet], aData);
(*aFunc)(mRuleProcessors[eTransitionSheet], aData);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleFor(Element* aElement,
nsStyleContext* aParentContext)
{
TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited,
aElement->OwnerDoc());
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);
aTreeMatchContext.ResetForUnvisitedMatching();
ElementRuleProcessorData data(PresContext(), aElement, &ruleWalker,
aTreeMatchContext);
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.mSkippingFlexItemStyleFixup) {
flags |= eSkipFlexItemStyleFixup;
}
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);
// FIXME: Perhaps this should be passed in, but it probably doesn't
// matter.
ruleWalker.SetLevel(eDocSheet, 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::ResolveStyleForRules(nsStyleContext* aParentContext,
nsStyleContext* aOldStyle,
const nsTArray<RuleAndLevel>& aRules)
{
nsRuleWalker ruleWalker(mRuleTree);
for (int32_t i = aRules.Length() - 1; i >= 0; --i) {
ruleWalker.SetLevel(aRules[i].mLevel, false, false);
ruleWalker.ForwardOnPossiblyCSSRule(aRules[i].mRule);
}
uint32_t flags = eNoFlags;
if (aOldStyle->IsLinkContext()) {
flags |= eIsLink;
}
if (aOldStyle->RelevantLinkVisited()) {
flags |= eIsVisitedLink;
}
return GetContext(aParentContext, ruleWalker.CurrentNode(), nullptr,
nullptr, nsCSSPseudoElements::ePseudo_NotPseudoElement,
nullptr, flags);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleByAddingRules(nsStyleContext* aBaseContext,
const nsCOMArray<nsIStyleRule> &aRules)
{
NS_ENSURE_FALSE(mInShutdown, nullptr);
nsRuleWalker ruleWalker(mRuleTree);
ruleWalker.SetCurrentNode(aBaseContext->RuleNode());
// FIXME: Perhaps this should be passed in, but it probably doesn't
// matter.
ruleWalker.SetLevel(eDocSheet, 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;
}
if (aBaseContext->RelevantLinkVisited()) {
flags |= eIsVisitedLink;
}
return GetContext(aBaseContext->GetParent(), ruleNode, visitedRuleNode,
aBaseContext->GetPseudo(),
aBaseContext->GetPseudoType(),
nullptr, flags);
}
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(eAgentSheet, 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);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolvePseudoElementStyle(Element* aParentElement,
nsCSSPseudoElements::Type aType,
nsStyleContext* aParentContext)
{
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);
TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited,
aParentElement->OwnerDoc());
PseudoElementRuleProcessorData data(PresContext(), aParentElement,
&ruleWalker, aType, treeContext);
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.
// Also: Flex containers shouldn't have pseudo-elements, so given that we're
// looking up pseudo-element style, make sure we're not treating our node as
// a flex item.
uint32_t flags = eSkipFlexItemStyleFixup;
if (aType == nsCSSPseudoElements::ePseudo_before ||
aType == nsCSSPseudoElements::ePseudo_after) {
flags |= eDoAnimation;
}
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());
return ProbePseudoElementStyle(aParentElement, aType, aParentContext,
treeContext);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ProbePseudoElementStyle(Element* aParentElement,
nsCSSPseudoElements::Type aType,
nsStyleContext* aParentContext,
TreeMatchContext& aTreeMatchContext)
{
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);
aTreeMatchContext.ResetForUnvisitedMatching();
PseudoElementRuleProcessorData data(PresContext(), aParentElement,
&ruleWalker, aType, aTreeMatchContext);
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.
// Also: Flex containers shouldn't have pseudo-elements, so given that we're
// looking up pseudo-element style, make sure we're not treating our node as
// a flex item.
uint32_t flags = eSkipFlexItemStyleFixup;
if (aType == nsCSSPseudoElements::ePseudo_before ||
aType == nsCSSPseudoElements::ePseudo_after) {
flags |= eDoAnimation;
}
nsRefPtr<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)
{
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);
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::ImportantRule*> importantRules;
nsPresContext* presContext = PresContext();
presContext->StyleSet()->AppendPageRules(presContext, rules);
for (uint32_t i = 0, i_end = rules.Length(); i != i_end; ++i) {
ruleWalker.Forward(rules[i]);
css::ImportantRule* importantRule = rules[i]->GetImportantRule();
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, eNoFlags);
}
#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);
TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited,
aParentElement->OwnerDoc());
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(nsPresContext* aPresContext,
nsTArray<nsFontFaceRuleContainer>& aArray)
{
NS_ENSURE_FALSE(mInShutdown, false);
for (uint32_t i = 0; i < ArrayLength(gCSSSheetTypes); ++i) {
if (gCSSSheetTypes[i] == eScopedDocSheet)
continue;
nsCSSRuleProcessor *ruleProc = static_cast<nsCSSRuleProcessor*>
(mRuleProcessors[gCSSSheetTypes[i]].get());
if (ruleProc && !ruleProc->AppendFontFaceRules(aPresContext, aArray))
return false;
}
return true;
}
bool
nsStyleSet::AppendKeyframesRules(nsPresContext* aPresContext,
nsTArray<nsCSSKeyframesRule*>& aArray)
{
NS_ENSURE_FALSE(mInShutdown, false);
for (uint32_t i = 0; i < ArrayLength(gCSSSheetTypes); ++i) {
if (gCSSSheetTypes[i] == eScopedDocSheet)
continue;
nsCSSRuleProcessor *ruleProc = static_cast<nsCSSRuleProcessor*>
(mRuleProcessors[gCSSSheetTypes[i]].get());
if (ruleProc && !ruleProc->AppendKeyframesRules(aPresContext, aArray))
return false;
}
return true;
}
bool
nsStyleSet::AppendPageRules(nsPresContext* aPresContext,
nsTArray<nsCSSPageRule*>& aArray)
{
NS_ENSURE_FALSE(mInShutdown, false);
for (uint32_t i = 0; i < NS_ARRAY_LENGTH(gCSSSheetTypes); ++i) {
if (gCSSSheetTypes[i] == eScopedDocSheet)
continue;
nsCSSRuleProcessor* ruleProc = static_cast<nsCSSRuleProcessor*>
(mRuleProcessors[gCSSSheetTypes[i]].get());
if (ruleProc && !ruleProc->AppendPageRules(aPresContext, aArray))
return false;
}
return true;
}
void
nsStyleSet::BeginShutdown(nsPresContext* aPresContext)
{
mInShutdown = 1;
mRoots.Clear(); // no longer valid, since we won't keep it up to date
}
void
nsStyleSet::Shutdown(nsPresContext* aPresContext)
{
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(nsPresContext* aPresContext,
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");
}
}
}
static inline nsRuleNode*
SkipAnimationRules(nsRuleNode* aRuleNode, Element* aElement, bool isPseudo)
{
nsRuleNode* ruleNode = aRuleNode;
while (!ruleNode->IsRoot() &&
(ruleNode->GetLevel() == nsStyleSet::eTransitionSheet ||
ruleNode->GetLevel() == nsStyleSet::eAnimationSheet)) {
ruleNode = ruleNode->GetParent();
}
if (ruleNode != aRuleNode) {
NS_ASSERTION(aElement, "How can we have transition rules but no element?");
// Need to do an animation restyle, just like
// nsTransitionManager::WalkTransitionRule and
// nsAnimationManager::GetAnimationRule would.
nsRestyleHint hint = isPseudo ? eRestyle_Subtree : eRestyle_Self;
aRuleNode->PresContext()->PresShell()->RestyleForAnimation(aElement, hint);
}
return ruleNode;
}
already_AddRefed<nsStyleContext>
nsStyleSet::ReparentStyleContext(nsStyleContext* aStyleContext,
nsStyleContext* aNewParentContext,
Element* aElement)
{
if (!aStyleContext) {
NS_NOTREACHED("must have style context");
return nullptr;
}
// 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) {
aStyleContext->AddRef();
return aStyleContext;
}
nsIAtom* pseudoTag = aStyleContext->GetPseudo();
nsCSSPseudoElements::Type pseudoType = aStyleContext->GetPseudoType();
nsRuleNode* ruleNode = aStyleContext->RuleNode();
// Skip transition rules as needed just like
// nsTransitionManager::WalkTransitionRule would.
bool skipAnimationRules = PresContext()->IsProcessingRestyles() &&
!PresContext()->IsProcessingAnimationStyleChange();
if (skipAnimationRules) {
// Make sure that we're not using transition rules or animation rules for
// our new style context. If we need them, an animation restyle will
// provide.
ruleNode =
SkipAnimationRules(ruleNode, aElement,
pseudoType !=
nsCSSPseudoElements::ePseudo_NotPseudoElement);
}
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();
// Again, skip transition rules as needed
if (skipAnimationRules) {
// FIXME do something here for animations?
visitedRuleNode =
SkipAnimationRules(visitedRuleNode, aElement,
pseudoType !=
nsCSSPseudoElements::ePseudo_NotPseudoElement);
}
}
uint32_t flags = eNoFlags;
if (aStyleContext->IsLinkContext()) {
flags |= eIsLink;
}
// If we're a style context for a link, then we already know whether
// our relevant link is visited, since that does not depend on our
// parent. Otherwise, we need to match aNewParentContext.
bool relevantLinkVisited = aStyleContext->IsLinkContext() ?
aStyleContext->RelevantLinkVisited() :
aNewParentContext->RelevantLinkVisited();
if (relevantLinkVisited) {
flags |= eIsVisitedLink;
}
if (pseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement ||
pseudoType == nsCSSPseudoElements::ePseudo_before ||
pseudoType == nsCSSPseudoElements::ePseudo_after) {
flags |= eDoAnimation;
}
return GetContext(aNewParentContext, ruleNode, visitedRuleNode,
pseudoTag, pseudoType,
aElement, flags);
}
struct StatefulData : public StateRuleProcessorData {
StatefulData(nsPresContext* aPresContext, Element* aElement,
nsEventStates aStateMask, TreeMatchContext& aTreeMatchContext)
: StateRuleProcessorData(aPresContext, aElement, aStateMask,
aTreeMatchContext),
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(nsPresContext* aPresContext,
nsIContent* aContent,
nsEventStates aStateMask)
{
if (!aContent || !aContent->IsElement())
return false;
TreeMatchContext treeContext(false, nsRuleWalker::eLinksVisitedOrUnvisited,
aContent->OwnerDoc());
StatefulData data(aPresContext, 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
}
// Test if style is dependent on content state
nsRestyleHint
nsStyleSet::HasStateDependentStyle(nsPresContext* aPresContext,
Element* aElement,
nsEventStates aStateMask)
{
TreeMatchContext treeContext(false, nsRuleWalker::eLinksVisitedOrUnvisited,
aElement->OwnerDoc());
StatefulData data(aPresContext, aElement, aStateMask, treeContext);
WalkRuleProcessors(SheetHasStatefulStyle, &data, false);
return data.mHint;
}
struct AttributeData : public AttributeRuleProcessorData {
AttributeData(nsPresContext* aPresContext,
Element* aElement, nsIAtom* aAttribute, int32_t aModType,
bool aAttrHasChanged, TreeMatchContext& aTreeMatchContext)
: AttributeRuleProcessorData(aPresContext, aElement, aAttribute, aModType,
aAttrHasChanged, aTreeMatchContext),
mHint(nsRestyleHint(0))
{}
nsRestyleHint mHint;
};
static bool
SheetHasAttributeStyle(nsIStyleRuleProcessor* aProcessor, void *aData)
{
AttributeData* data = (AttributeData*)aData;
nsRestyleHint hint = aProcessor->HasAttributeDependentStyle(data);
data->mHint = nsRestyleHint(data->mHint | hint);
return true; // continue
}
// Test if style is dependent on content state
nsRestyleHint
nsStyleSet::HasAttributeDependentStyle(nsPresContext* aPresContext,
Element* aElement,
nsIAtom* aAttribute,
int32_t aModType,
bool aAttrHasChanged)
{
TreeMatchContext treeContext(false, nsRuleWalker::eLinksVisitedOrUnvisited,
aElement->OwnerDoc());
AttributeData data(aPresContext, aElement, aAttribute,
aModType, aAttrHasChanged, treeContext);
WalkRuleProcessors(SheetHasAttributeStyle, &data, false);
return data.mHint;
}
bool
nsStyleSet::MediumFeaturesChanged(nsPresContext* aPresContext)
{
// We can't use WalkRuleProcessors without a content node.
bool stylesChanged = false;
for (uint32_t i = 0; i < ArrayLength(mRuleProcessors); ++i) {
nsIStyleRuleProcessor *processor = mRuleProcessors[i];
if (!processor) {
continue;
}
bool thisChanged = processor->MediumFeaturesChanged(aPresContext);
stylesChanged = stylesChanged || thisChanged;
}
for (uint32_t i = 0; i < mScopedDocSheetRuleProcessors.Length(); ++i) {
nsIStyleRuleProcessor *processor = mScopedDocSheetRuleProcessors[i];
bool thisChanged = processor->MediumFeaturesChanged(aPresContext);
stylesChanged = stylesChanged || thisChanged;
}
if (mBindingManager) {
bool thisChanged = false;
mBindingManager->MediumFeaturesChanged(aPresContext, &thisChanged);
stylesChanged = stylesChanged || thisChanged;
}
return stylesChanged;
}
nsCSSStyleSheet::EnsureUniqueInnerResult
nsStyleSet::EnsureUniqueInnerOnCSSSheets()
{
nsAutoTArray<nsCSSStyleSheet*, 32> queue;
for (uint32_t i = 0; i < ArrayLength(gCSSSheetTypes); ++i) {
nsCOMArray<nsIStyleSheet> &sheets = mSheets[gCSSSheetTypes[i]];
for (uint32_t j = 0, j_end = sheets.Count(); j < j_end; ++j) {
nsCSSStyleSheet *sheet = static_cast<nsCSSStyleSheet*>(sheets[j]);
if (!queue.AppendElement(sheet)) {
return nsCSSStyleSheet::eUniqueInner_CloneFailed;
}
}
}
if (mBindingManager) {
mBindingManager->AppendAllSheets(queue);
}
nsCSSStyleSheet::EnsureUniqueInnerResult res =
nsCSSStyleSheet::eUniqueInner_AlreadyUnique;
while (!queue.IsEmpty()) {
uint32_t idx = queue.Length() - 1;
nsCSSStyleSheet *sheet = queue[idx];
queue.RemoveElementAt(idx);
nsCSSStyleSheet::EnsureUniqueInnerResult sheetRes =
sheet->EnsureUniqueInner();
if (sheetRes == nsCSSStyleSheet::eUniqueInner_CloneFailed) {
return sheetRes;
}
if (sheetRes == nsCSSStyleSheet::eUniqueInner_ClonedInner) {
res = sheetRes;
}
// Enqueue all the sheet's children.
if (!sheet->AppendAllChildSheets(queue)) {
return nsCSSStyleSheet::eUniqueInner_CloneFailed;
}
}
return res;
}
nsIStyleRule*
nsStyleSet::InitialStyleRule()
{
if (!mInitialStyleRule) {
mInitialStyleRule = new nsInitialStyleRule;
}
return mInitialStyleRule;
}
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