4077 lines
141 KiB
C++
4077 lines
141 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:tabstop=2:expandtab:shiftwidth=2:
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* style rule processor for CSS style sheets, responsible for selector
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* matching and cascading
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*/
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#define PL_ARENA_CONST_ALIGN_MASK 7
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// We want page-sized arenas so there's no fragmentation involved.
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// Including plarena.h must come first to avoid it being included by some
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// header file thereby making PL_ARENA_CONST_ALIGN_MASK ineffective.
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#define NS_CASCADEENUMDATA_ARENA_BLOCK_SIZE (4096)
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#include "plarena.h"
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#include "nsAutoPtr.h"
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#include "nsCSSRuleProcessor.h"
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#include "nsRuleProcessorData.h"
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#include <algorithm>
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#include "nsIAtom.h"
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#include "PLDHashTable.h"
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#include "nsICSSPseudoComparator.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/css/StyleRule.h"
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#include "mozilla/css/GroupRule.h"
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#include "nsIDocument.h"
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#include "nsPresContext.h"
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#include "nsGkAtoms.h"
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#include "nsUnicharUtils.h"
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#include "nsError.h"
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#include "nsRuleWalker.h"
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#include "nsCSSPseudoClasses.h"
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#include "nsCSSPseudoElements.h"
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#include "nsIContent.h"
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#include "nsCOMPtr.h"
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#include "nsHashKeys.h"
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#include "nsStyleUtil.h"
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#include "nsQuickSort.h"
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#include "nsAttrValue.h"
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#include "nsAttrValueInlines.h"
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#include "nsAttrName.h"
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#include "nsTArray.h"
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#include "nsContentUtils.h"
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#include "nsIMediaList.h"
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#include "nsCSSRules.h"
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#include "nsStyleSet.h"
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#include "mozilla/dom/Element.h"
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#include "nsNthIndexCache.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/EventStates.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/LookAndFeel.h"
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#include "mozilla/Likely.h"
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#include "mozilla/OperatorNewExtensions.h"
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#include "mozilla/TypedEnumBits.h"
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#include "RuleProcessorCache.h"
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#include "nsIDOMMutationEvent.h"
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#include "nsIMozBrowserFrame.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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#define VISITED_PSEUDO_PREF "layout.css.visited_links_enabled"
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static bool gSupportVisitedPseudo = true;
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static nsTArray< nsCOMPtr<nsIAtom> >* sSystemMetrics = 0;
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#ifdef XP_WIN
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uint8_t nsCSSRuleProcessor::sWinThemeId = LookAndFeel::eWindowsTheme_Generic;
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#endif
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/**
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* A struct representing a given CSS rule and a particular selector
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* from that rule's selector list.
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*/
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struct RuleSelectorPair {
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RuleSelectorPair(css::StyleRule* aRule, nsCSSSelector* aSelector)
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: mRule(aRule), mSelector(aSelector) {}
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// If this class ever grows a destructor, deal with
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// PerWeightDataListItem appropriately.
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css::StyleRule* mRule;
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nsCSSSelector* mSelector; // which of |mRule|'s selectors
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};
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#define NS_IS_ANCESTOR_OPERATOR(ch) \
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((ch) == char16_t(' ') || (ch) == char16_t('>'))
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/**
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* A struct representing a particular rule in an ordered list of rules
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* (the ordering depending on the weight of mSelector and the order of
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* our rules to start with).
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*/
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struct RuleValue : RuleSelectorPair {
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enum {
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eMaxAncestorHashes = 4
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};
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RuleValue(const RuleSelectorPair& aRuleSelectorPair, int32_t aIndex,
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bool aQuirksMode) :
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RuleSelectorPair(aRuleSelectorPair),
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mIndex(aIndex)
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{
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CollectAncestorHashes(aQuirksMode);
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}
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int32_t mIndex; // High index means high weight/order.
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uint32_t mAncestorSelectorHashes[eMaxAncestorHashes];
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private:
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void CollectAncestorHashes(bool aQuirksMode) {
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// Collect up our mAncestorSelectorHashes. It's not clear whether it's
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// better to stop once we've found eMaxAncestorHashes of them or to keep
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// going and preferentially collect information from selectors higher up the
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// chain... Let's do the former for now.
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size_t hashIndex = 0;
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for (nsCSSSelector* sel = mSelector->mNext; sel; sel = sel->mNext) {
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if (!NS_IS_ANCESTOR_OPERATOR(sel->mOperator)) {
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// |sel| is going to select something that's not actually one of our
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// ancestors, so don't add it to mAncestorSelectorHashes. But keep
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// going, because it'll select a sibling of one of our ancestors, so its
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// ancestors would be our ancestors too.
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continue;
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}
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// Now sel is supposed to select one of our ancestors. Grab
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// whatever info we can from it into mAncestorSelectorHashes.
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// But in qurks mode, don't grab IDs and classes because those
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// need to be matched case-insensitively.
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if (!aQuirksMode) {
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nsAtomList* ids = sel->mIDList;
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while (ids) {
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mAncestorSelectorHashes[hashIndex++] = ids->mAtom->hash();
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if (hashIndex == eMaxAncestorHashes) {
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return;
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}
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ids = ids->mNext;
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}
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nsAtomList* classes = sel->mClassList;
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while (classes) {
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mAncestorSelectorHashes[hashIndex++] = classes->mAtom->hash();
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if (hashIndex == eMaxAncestorHashes) {
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return;
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}
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classes = classes->mNext;
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}
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}
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// Only put in the tag name if it's all-lowercase. Otherwise we run into
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// trouble because we may test the wrong one of mLowercaseTag and
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// mCasedTag against the filter.
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if (sel->mLowercaseTag && sel->mCasedTag == sel->mLowercaseTag) {
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mAncestorSelectorHashes[hashIndex++] = sel->mLowercaseTag->hash();
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if (hashIndex == eMaxAncestorHashes) {
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return;
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}
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}
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}
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while (hashIndex != eMaxAncestorHashes) {
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mAncestorSelectorHashes[hashIndex++] = 0;
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}
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}
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};
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// ------------------------------
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// Rule hash table
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//
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// Uses any of the sets of ops below.
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struct RuleHashTableEntry : public PLDHashEntryHdr {
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// If you add members that have heap allocated memory be sure to change the
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// logic in SizeOfRuleHashTable().
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// Auto length 1, because we always have at least one entry in mRules.
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AutoTArray<RuleValue, 1> mRules;
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};
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struct RuleHashTagTableEntry : public RuleHashTableEntry {
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// If you add members that have heap allocated memory be sure to change the
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// logic in RuleHash::SizeOf{In,Ex}cludingThis.
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nsCOMPtr<nsIAtom> mTag;
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};
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static PLDHashNumber
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RuleHash_CIHashKey(const void *key)
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{
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nsIAtom *atom = const_cast<nsIAtom*>(static_cast<const nsIAtom*>(key));
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nsAutoString str;
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atom->ToString(str);
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nsContentUtils::ASCIIToLower(str);
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return HashString(str);
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}
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static inline nsCSSSelector*
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SubjectSelectorForRuleHash(const PLDHashEntryHdr *hdr)
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{
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auto entry = static_cast<const RuleHashTableEntry*>(hdr);
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nsCSSSelector* selector = entry->mRules[0].mSelector;
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if (selector->IsPseudoElement()) {
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selector = selector->mNext;
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}
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return selector;
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}
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static inline bool
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CIMatchAtoms(const void* key, nsIAtom *entry_atom)
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{
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auto match_atom = const_cast<nsIAtom*>(static_cast<const nsIAtom*>(key));
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// Check for case-sensitive match first.
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if (match_atom == entry_atom) {
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return true;
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}
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// Use EqualsIgnoreASCIICase instead of full on unicode case conversion
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// in order to save on performance. This is only used in quirks mode
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// anyway.
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return
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nsContentUtils::EqualsIgnoreASCIICase(nsDependentAtomString(entry_atom),
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nsDependentAtomString(match_atom));
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}
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static inline bool
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CSMatchAtoms(const void* key, nsIAtom *entry_atom)
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{
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auto match_atom = const_cast<nsIAtom*>(static_cast<const nsIAtom*>(key));
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return match_atom == entry_atom;
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}
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static bool
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RuleHash_ClassCIMatchEntry(const PLDHashEntryHdr *hdr, const void *key)
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{
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return CIMatchAtoms(key, SubjectSelectorForRuleHash(hdr)->mClassList->mAtom);
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}
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static bool
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RuleHash_IdCIMatchEntry(const PLDHashEntryHdr *hdr, const void *key)
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{
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return CIMatchAtoms(key, SubjectSelectorForRuleHash(hdr)->mIDList->mAtom);
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}
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static bool
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RuleHash_ClassCSMatchEntry(const PLDHashEntryHdr *hdr, const void *key)
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{
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return CSMatchAtoms(key, SubjectSelectorForRuleHash(hdr)->mClassList->mAtom);
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}
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static bool
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RuleHash_IdCSMatchEntry(const PLDHashEntryHdr *hdr, const void *key)
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{
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return CSMatchAtoms(key, SubjectSelectorForRuleHash(hdr)->mIDList->mAtom);
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}
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static void
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RuleHash_InitEntry(PLDHashEntryHdr *hdr, const void *key)
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{
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RuleHashTableEntry* entry = static_cast<RuleHashTableEntry*>(hdr);
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new (KnownNotNull, entry) RuleHashTableEntry();
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}
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static void
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RuleHash_ClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
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{
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RuleHashTableEntry* entry = static_cast<RuleHashTableEntry*>(hdr);
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entry->~RuleHashTableEntry();
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}
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static void
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RuleHash_MoveEntry(PLDHashTable *table, const PLDHashEntryHdr *from,
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PLDHashEntryHdr *to)
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{
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NS_PRECONDITION(from != to, "This is not going to work!");
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RuleHashTableEntry *oldEntry =
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const_cast<RuleHashTableEntry*>(
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static_cast<const RuleHashTableEntry*>(from));
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auto* newEntry = new (KnownNotNull, to) RuleHashTableEntry();
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newEntry->mRules.SwapElements(oldEntry->mRules);
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oldEntry->~RuleHashTableEntry();
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}
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static bool
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RuleHash_TagTable_MatchEntry(const PLDHashEntryHdr *hdr, const void *key)
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{
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nsIAtom *match_atom = const_cast<nsIAtom*>(static_cast<const nsIAtom*>(key));
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nsIAtom *entry_atom = static_cast<const RuleHashTagTableEntry*>(hdr)->mTag;
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return match_atom == entry_atom;
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}
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static void
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RuleHash_TagTable_InitEntry(PLDHashEntryHdr *hdr, const void *key)
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{
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RuleHashTagTableEntry* entry = static_cast<RuleHashTagTableEntry*>(hdr);
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new (KnownNotNull, entry) RuleHashTagTableEntry();
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entry->mTag = const_cast<nsIAtom*>(static_cast<const nsIAtom*>(key));
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}
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static void
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RuleHash_TagTable_ClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
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{
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RuleHashTagTableEntry* entry = static_cast<RuleHashTagTableEntry*>(hdr);
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entry->~RuleHashTagTableEntry();
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}
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static void
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RuleHash_TagTable_MoveEntry(PLDHashTable *table, const PLDHashEntryHdr *from,
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PLDHashEntryHdr *to)
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{
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NS_PRECONDITION(from != to, "This is not going to work!");
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RuleHashTagTableEntry *oldEntry =
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const_cast<RuleHashTagTableEntry*>(
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static_cast<const RuleHashTagTableEntry*>(from));
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auto* newEntry = new (KnownNotNull, to) RuleHashTagTableEntry();
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newEntry->mTag.swap(oldEntry->mTag);
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newEntry->mRules.SwapElements(oldEntry->mRules);
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oldEntry->~RuleHashTagTableEntry();
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}
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static PLDHashNumber
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RuleHash_NameSpaceTable_HashKey(const void *key)
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{
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return NS_PTR_TO_INT32(key);
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}
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static bool
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RuleHash_NameSpaceTable_MatchEntry(const PLDHashEntryHdr *hdr, const void *key)
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{
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const RuleHashTableEntry *entry =
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static_cast<const RuleHashTableEntry*>(hdr);
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nsCSSSelector* selector = entry->mRules[0].mSelector;
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if (selector->IsPseudoElement()) {
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selector = selector->mNext;
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}
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return NS_PTR_TO_INT32(key) == selector->mNameSpace;
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}
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static const PLDHashTableOps RuleHash_TagTable_Ops = {
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PLDHashTable::HashVoidPtrKeyStub,
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RuleHash_TagTable_MatchEntry,
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RuleHash_TagTable_MoveEntry,
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RuleHash_TagTable_ClearEntry,
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RuleHash_TagTable_InitEntry
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};
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// Case-sensitive ops.
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static const PLDHashTableOps RuleHash_ClassTable_CSOps = {
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PLDHashTable::HashVoidPtrKeyStub,
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RuleHash_ClassCSMatchEntry,
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RuleHash_MoveEntry,
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RuleHash_ClearEntry,
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RuleHash_InitEntry
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};
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// Case-insensitive ops.
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static const PLDHashTableOps RuleHash_ClassTable_CIOps = {
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RuleHash_CIHashKey,
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RuleHash_ClassCIMatchEntry,
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RuleHash_MoveEntry,
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RuleHash_ClearEntry,
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RuleHash_InitEntry
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};
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// Case-sensitive ops.
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static const PLDHashTableOps RuleHash_IdTable_CSOps = {
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PLDHashTable::HashVoidPtrKeyStub,
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RuleHash_IdCSMatchEntry,
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RuleHash_MoveEntry,
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RuleHash_ClearEntry,
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RuleHash_InitEntry
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};
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// Case-insensitive ops.
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static const PLDHashTableOps RuleHash_IdTable_CIOps = {
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RuleHash_CIHashKey,
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RuleHash_IdCIMatchEntry,
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RuleHash_MoveEntry,
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RuleHash_ClearEntry,
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RuleHash_InitEntry
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};
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static const PLDHashTableOps RuleHash_NameSpaceTable_Ops = {
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RuleHash_NameSpaceTable_HashKey,
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RuleHash_NameSpaceTable_MatchEntry,
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RuleHash_MoveEntry,
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RuleHash_ClearEntry,
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RuleHash_InitEntry
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};
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#undef RULE_HASH_STATS
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#undef PRINT_UNIVERSAL_RULES
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#ifdef RULE_HASH_STATS
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#define RULE_HASH_STAT_INCREMENT(var_) PR_BEGIN_MACRO ++(var_); PR_END_MACRO
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#else
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#define RULE_HASH_STAT_INCREMENT(var_) PR_BEGIN_MACRO PR_END_MACRO
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#endif
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struct NodeMatchContext;
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class RuleHash {
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public:
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explicit RuleHash(bool aQuirksMode);
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~RuleHash();
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void AppendRule(const RuleSelectorPair &aRuleInfo);
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void EnumerateAllRules(Element* aElement, ElementDependentRuleProcessorData* aData,
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NodeMatchContext& aNodeMatchContext);
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size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const;
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size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
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protected:
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typedef nsTArray<RuleValue> RuleValueList;
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void AppendRuleToTable(PLDHashTable* aTable, const void* aKey,
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const RuleSelectorPair& aRuleInfo);
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void AppendUniversalRule(const RuleSelectorPair& aRuleInfo);
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int32_t mRuleCount;
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PLDHashTable mIdTable;
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PLDHashTable mClassTable;
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PLDHashTable mTagTable;
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PLDHashTable mNameSpaceTable;
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RuleValueList mUniversalRules;
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struct EnumData {
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const RuleValue* mCurValue;
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const RuleValue* mEnd;
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};
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EnumData* mEnumList;
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int32_t mEnumListSize;
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bool mQuirksMode;
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inline EnumData ToEnumData(const RuleValueList& arr) {
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EnumData data = { arr.Elements(), arr.Elements() + arr.Length() };
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return data;
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}
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#ifdef RULE_HASH_STATS
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uint32_t mUniversalSelectors;
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uint32_t mNameSpaceSelectors;
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uint32_t mTagSelectors;
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uint32_t mClassSelectors;
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uint32_t mIdSelectors;
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uint32_t mElementsMatched;
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uint32_t mElementUniversalCalls;
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uint32_t mElementNameSpaceCalls;
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uint32_t mElementTagCalls;
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uint32_t mElementClassCalls;
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uint32_t mElementIdCalls;
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#endif // RULE_HASH_STATS
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};
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RuleHash::RuleHash(bool aQuirksMode)
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: mRuleCount(0),
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mIdTable(aQuirksMode ? &RuleHash_IdTable_CIOps
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: &RuleHash_IdTable_CSOps,
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sizeof(RuleHashTableEntry)),
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mClassTable(aQuirksMode ? &RuleHash_ClassTable_CIOps
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: &RuleHash_ClassTable_CSOps,
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sizeof(RuleHashTableEntry)),
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mTagTable(&RuleHash_TagTable_Ops, sizeof(RuleHashTagTableEntry)),
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mNameSpaceTable(&RuleHash_NameSpaceTable_Ops, sizeof(RuleHashTableEntry)),
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mUniversalRules(0),
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mEnumList(nullptr), mEnumListSize(0),
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mQuirksMode(aQuirksMode)
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#ifdef RULE_HASH_STATS
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,
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mUniversalSelectors(0),
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mNameSpaceSelectors(0),
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mTagSelectors(0),
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mClassSelectors(0),
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mIdSelectors(0),
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mElementsMatched(0),
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mElementUniversalCalls(0),
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mElementNameSpaceCalls(0),
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mElementTagCalls(0),
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mElementClassCalls(0),
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mElementIdCalls(0)
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#endif
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{
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MOZ_COUNT_CTOR(RuleHash);
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}
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RuleHash::~RuleHash()
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{
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MOZ_COUNT_DTOR(RuleHash);
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#ifdef RULE_HASH_STATS
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printf(
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"RuleHash(%p):\n"
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" Selectors: Universal (%u) NameSpace(%u) Tag(%u) Class(%u) Id(%u)\n"
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|
" Content Nodes: Elements(%u)\n"
|
|
" Element Calls: Universal(%u) NameSpace(%u) Tag(%u) Class(%u) Id(%u)\n"
|
|
static_cast<void*>(this),
|
|
mUniversalSelectors, mNameSpaceSelectors, mTagSelectors,
|
|
mClassSelectors, mIdSelectors,
|
|
mElementsMatched,
|
|
mElementUniversalCalls, mElementNameSpaceCalls, mElementTagCalls,
|
|
mElementClassCalls, mElementIdCalls);
|
|
#ifdef PRINT_UNIVERSAL_RULES
|
|
{
|
|
if (mUniversalRules.Length() > 0) {
|
|
printf(" Universal rules:\n");
|
|
for (uint32_t i = 0; i < mUniversalRules.Length(); ++i) {
|
|
RuleValue* value = &(mUniversalRules[i]);
|
|
nsAutoString selectorText;
|
|
uint32_t lineNumber = value->mRule->GetLineNumber();
|
|
RefPtr<CSSStyleSheet> cssSheet = value->mRule->GetStyleSheet();
|
|
value->mSelector->ToString(selectorText, cssSheet);
|
|
|
|
printf(" line %d, %s\n",
|
|
lineNumber, NS_ConvertUTF16toUTF8(selectorText).get());
|
|
}
|
|
}
|
|
}
|
|
#endif // PRINT_UNIVERSAL_RULES
|
|
#endif // RULE_HASH_STATS
|
|
// Rule Values are arena allocated no need to delete them. Their destructor
|
|
// isn't doing any cleanup. So we dont even bother to enumerate through
|
|
// the hash tables and call their destructors.
|
|
if (nullptr != mEnumList) {
|
|
delete [] mEnumList;
|
|
}
|
|
}
|
|
|
|
void RuleHash::AppendRuleToTable(PLDHashTable* aTable, const void* aKey,
|
|
const RuleSelectorPair& aRuleInfo)
|
|
{
|
|
// Get a new or existing entry.
|
|
auto entry = static_cast<RuleHashTableEntry*>(aTable->Add(aKey, fallible));
|
|
if (!entry)
|
|
return;
|
|
entry->mRules.AppendElement(RuleValue(aRuleInfo, mRuleCount++, mQuirksMode));
|
|
}
|
|
|
|
static void
|
|
AppendRuleToTagTable(PLDHashTable* aTable, nsIAtom* aKey,
|
|
const RuleValue& aRuleInfo)
|
|
{
|
|
// Get a new or exisiting entry
|
|
auto entry = static_cast<RuleHashTagTableEntry*>(aTable->Add(aKey, fallible));
|
|
if (!entry)
|
|
return;
|
|
|
|
entry->mRules.AppendElement(aRuleInfo);
|
|
}
|
|
|
|
void RuleHash::AppendUniversalRule(const RuleSelectorPair& aRuleInfo)
|
|
{
|
|
mUniversalRules.AppendElement(RuleValue(aRuleInfo, mRuleCount++, mQuirksMode));
|
|
}
|
|
|
|
void RuleHash::AppendRule(const RuleSelectorPair& aRuleInfo)
|
|
{
|
|
nsCSSSelector *selector = aRuleInfo.mSelector;
|
|
if (selector->IsPseudoElement()) {
|
|
selector = selector->mNext;
|
|
}
|
|
if (nullptr != selector->mIDList) {
|
|
AppendRuleToTable(&mIdTable, selector->mIDList->mAtom, aRuleInfo);
|
|
RULE_HASH_STAT_INCREMENT(mIdSelectors);
|
|
}
|
|
else if (nullptr != selector->mClassList) {
|
|
AppendRuleToTable(&mClassTable, selector->mClassList->mAtom, aRuleInfo);
|
|
RULE_HASH_STAT_INCREMENT(mClassSelectors);
|
|
}
|
|
else if (selector->mLowercaseTag) {
|
|
RuleValue ruleValue(aRuleInfo, mRuleCount++, mQuirksMode);
|
|
AppendRuleToTagTable(&mTagTable, selector->mLowercaseTag, ruleValue);
|
|
RULE_HASH_STAT_INCREMENT(mTagSelectors);
|
|
if (selector->mCasedTag &&
|
|
selector->mCasedTag != selector->mLowercaseTag) {
|
|
AppendRuleToTagTable(&mTagTable, selector->mCasedTag, ruleValue);
|
|
RULE_HASH_STAT_INCREMENT(mTagSelectors);
|
|
}
|
|
}
|
|
else if (kNameSpaceID_Unknown != selector->mNameSpace) {
|
|
AppendRuleToTable(&mNameSpaceTable,
|
|
NS_INT32_TO_PTR(selector->mNameSpace), aRuleInfo);
|
|
RULE_HASH_STAT_INCREMENT(mNameSpaceSelectors);
|
|
}
|
|
else { // universal tag selector
|
|
AppendUniversalRule(aRuleInfo);
|
|
RULE_HASH_STAT_INCREMENT(mUniversalSelectors);
|
|
}
|
|
}
|
|
|
|
// this should cover practically all cases so we don't need to reallocate
|
|
#define MIN_ENUM_LIST_SIZE 8
|
|
|
|
#ifdef RULE_HASH_STATS
|
|
#define RULE_HASH_STAT_INCREMENT_LIST_COUNT(list_, var_) \
|
|
(var_) += (list_).Length()
|
|
#else
|
|
#define RULE_HASH_STAT_INCREMENT_LIST_COUNT(list_, var_) \
|
|
PR_BEGIN_MACRO PR_END_MACRO
|
|
#endif
|
|
|
|
static inline
|
|
void ContentEnumFunc(const RuleValue &value, nsCSSSelector* selector,
|
|
ElementDependentRuleProcessorData* data, NodeMatchContext& nodeContext,
|
|
AncestorFilter *ancestorFilter);
|
|
|
|
void RuleHash::EnumerateAllRules(Element* aElement, ElementDependentRuleProcessorData* aData,
|
|
NodeMatchContext& aNodeContext)
|
|
{
|
|
int32_t nameSpace = aElement->GetNameSpaceID();
|
|
nsIAtom* tag = aElement->NodeInfo()->NameAtom();
|
|
nsIAtom* id = aElement->GetID();
|
|
const nsAttrValue* classList = aElement->GetClasses();
|
|
|
|
MOZ_ASSERT(tag, "How could we not have a tag?");
|
|
|
|
int32_t classCount = classList ? classList->GetAtomCount() : 0;
|
|
|
|
// assume 1 universal, tag, id, and namespace, rather than wasting
|
|
// time counting
|
|
int32_t testCount = classCount + 4;
|
|
|
|
if (mEnumListSize < testCount) {
|
|
delete [] mEnumList;
|
|
mEnumListSize = std::max(testCount, MIN_ENUM_LIST_SIZE);
|
|
mEnumList = new EnumData[mEnumListSize];
|
|
}
|
|
|
|
int32_t valueCount = 0;
|
|
RULE_HASH_STAT_INCREMENT(mElementsMatched);
|
|
|
|
if (mUniversalRules.Length() != 0) { // universal rules
|
|
mEnumList[valueCount++] = ToEnumData(mUniversalRules);
|
|
RULE_HASH_STAT_INCREMENT_LIST_COUNT(mUniversalRules, mElementUniversalCalls);
|
|
}
|
|
// universal rules within the namespace
|
|
if (kNameSpaceID_Unknown != nameSpace && mNameSpaceTable.EntryCount() > 0) {
|
|
auto entry = static_cast<RuleHashTableEntry*>
|
|
(mNameSpaceTable.Search(NS_INT32_TO_PTR(nameSpace)));
|
|
if (entry) {
|
|
mEnumList[valueCount++] = ToEnumData(entry->mRules);
|
|
RULE_HASH_STAT_INCREMENT_LIST_COUNT(entry->mRules, mElementNameSpaceCalls);
|
|
}
|
|
}
|
|
if (mTagTable.EntryCount() > 0) {
|
|
auto entry = static_cast<RuleHashTableEntry*>(mTagTable.Search(tag));
|
|
if (entry) {
|
|
mEnumList[valueCount++] = ToEnumData(entry->mRules);
|
|
RULE_HASH_STAT_INCREMENT_LIST_COUNT(entry->mRules, mElementTagCalls);
|
|
}
|
|
}
|
|
if (id && mIdTable.EntryCount() > 0) {
|
|
auto entry = static_cast<RuleHashTableEntry*>(mIdTable.Search(id));
|
|
if (entry) {
|
|
mEnumList[valueCount++] = ToEnumData(entry->mRules);
|
|
RULE_HASH_STAT_INCREMENT_LIST_COUNT(entry->mRules, mElementIdCalls);
|
|
}
|
|
}
|
|
if (mClassTable.EntryCount() > 0) {
|
|
for (int32_t index = 0; index < classCount; ++index) {
|
|
auto entry = static_cast<RuleHashTableEntry*>
|
|
(mClassTable.Search(classList->AtomAt(index)));
|
|
if (entry) {
|
|
mEnumList[valueCount++] = ToEnumData(entry->mRules);
|
|
RULE_HASH_STAT_INCREMENT_LIST_COUNT(entry->mRules, mElementClassCalls);
|
|
}
|
|
}
|
|
}
|
|
NS_ASSERTION(valueCount <= testCount, "values exceeded list size");
|
|
|
|
if (valueCount > 0) {
|
|
AncestorFilter *filter =
|
|
aData->mTreeMatchContext.mAncestorFilter.HasFilter() ?
|
|
&aData->mTreeMatchContext.mAncestorFilter : nullptr;
|
|
#ifdef DEBUG
|
|
if (filter) {
|
|
filter->AssertHasAllAncestors(aElement);
|
|
}
|
|
#endif
|
|
// Merge the lists while there are still multiple lists to merge.
|
|
while (valueCount > 1) {
|
|
int32_t valueIndex = 0;
|
|
int32_t lowestRuleIndex = mEnumList[valueIndex].mCurValue->mIndex;
|
|
for (int32_t index = 1; index < valueCount; ++index) {
|
|
int32_t ruleIndex = mEnumList[index].mCurValue->mIndex;
|
|
if (ruleIndex < lowestRuleIndex) {
|
|
valueIndex = index;
|
|
lowestRuleIndex = ruleIndex;
|
|
}
|
|
}
|
|
const RuleValue *cur = mEnumList[valueIndex].mCurValue;
|
|
ContentEnumFunc(*cur, cur->mSelector, aData, aNodeContext, filter);
|
|
cur++;
|
|
if (cur == mEnumList[valueIndex].mEnd) {
|
|
mEnumList[valueIndex] = mEnumList[--valueCount];
|
|
} else {
|
|
mEnumList[valueIndex].mCurValue = cur;
|
|
}
|
|
}
|
|
|
|
// Fast loop over single value.
|
|
for (const RuleValue *value = mEnumList[0].mCurValue,
|
|
*end = mEnumList[0].mEnd;
|
|
value != end; ++value) {
|
|
ContentEnumFunc(*value, value->mSelector, aData, aNodeContext, filter);
|
|
}
|
|
}
|
|
}
|
|
|
|
static size_t
|
|
SizeOfRuleHashTable(const PLDHashTable& aTable, MallocSizeOf aMallocSizeOf)
|
|
{
|
|
size_t n = aTable.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
for (auto iter = aTable.ConstIter(); !iter.Done(); iter.Next()) {
|
|
auto entry = static_cast<RuleHashTableEntry*>(iter.Get());
|
|
n += entry->mRules.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
}
|
|
return n;
|
|
}
|
|
|
|
size_t
|
|
RuleHash::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
|
|
{
|
|
size_t n = 0;
|
|
|
|
n += SizeOfRuleHashTable(mIdTable, aMallocSizeOf);
|
|
|
|
n += SizeOfRuleHashTable(mClassTable, aMallocSizeOf);
|
|
|
|
n += SizeOfRuleHashTable(mTagTable, aMallocSizeOf);
|
|
|
|
n += SizeOfRuleHashTable(mNameSpaceTable, aMallocSizeOf);
|
|
|
|
n += mUniversalRules.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
|
|
return n;
|
|
}
|
|
|
|
size_t
|
|
RuleHash::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
|
|
{
|
|
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
|
|
}
|
|
|
|
//--------------------------------
|
|
|
|
/**
|
|
* A struct that stores an nsCSSSelector pointer along side a pointer to
|
|
* the rightmost nsCSSSelector in the selector. For example, for
|
|
*
|
|
* .main p > span
|
|
*
|
|
* if mSelector points to the |p| nsCSSSelector, mRightmostSelector would
|
|
* point to the |span| nsCSSSelector.
|
|
*
|
|
* Both mSelector and mRightmostSelector are always top-level selectors,
|
|
* i.e. they aren't selectors within a :not() or :-moz-any().
|
|
*/
|
|
struct SelectorPair
|
|
{
|
|
SelectorPair(nsCSSSelector* aSelector, nsCSSSelector* aRightmostSelector)
|
|
: mSelector(aSelector), mRightmostSelector(aRightmostSelector)
|
|
{
|
|
MOZ_ASSERT(aSelector);
|
|
MOZ_ASSERT(mRightmostSelector);
|
|
}
|
|
SelectorPair(const SelectorPair& aOther) = default;
|
|
nsCSSSelector* const mSelector;
|
|
nsCSSSelector* const mRightmostSelector;
|
|
};
|
|
|
|
// A hash table mapping atoms to lists of selectors
|
|
struct AtomSelectorEntry : public PLDHashEntryHdr {
|
|
nsIAtom *mAtom;
|
|
// Auto length 2, because a decent fraction of these arrays ends up
|
|
// with 2 elements, and each entry is cheap.
|
|
AutoTArray<SelectorPair, 2> mSelectors;
|
|
};
|
|
|
|
static void
|
|
AtomSelector_ClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
|
|
{
|
|
(static_cast<AtomSelectorEntry*>(hdr))->~AtomSelectorEntry();
|
|
}
|
|
|
|
static void
|
|
AtomSelector_InitEntry(PLDHashEntryHdr *hdr, const void *key)
|
|
{
|
|
AtomSelectorEntry *entry = static_cast<AtomSelectorEntry*>(hdr);
|
|
new (KnownNotNull, entry) AtomSelectorEntry();
|
|
entry->mAtom = const_cast<nsIAtom*>(static_cast<const nsIAtom*>(key));
|
|
}
|
|
|
|
static void
|
|
AtomSelector_MoveEntry(PLDHashTable *table, const PLDHashEntryHdr *from,
|
|
PLDHashEntryHdr *to)
|
|
{
|
|
NS_PRECONDITION(from != to, "This is not going to work!");
|
|
AtomSelectorEntry *oldEntry =
|
|
const_cast<AtomSelectorEntry*>(static_cast<const AtomSelectorEntry*>(from));
|
|
auto* newEntry = new (KnownNotNull, to) AtomSelectorEntry();
|
|
newEntry->mAtom = oldEntry->mAtom;
|
|
newEntry->mSelectors.SwapElements(oldEntry->mSelectors);
|
|
oldEntry->~AtomSelectorEntry();
|
|
}
|
|
|
|
static bool
|
|
AtomSelector_CIMatchEntry(const PLDHashEntryHdr *hdr, const void *key)
|
|
{
|
|
const AtomSelectorEntry *entry = static_cast<const AtomSelectorEntry*>(hdr);
|
|
return CIMatchAtoms(key, entry->mAtom);
|
|
}
|
|
|
|
// Case-sensitive ops.
|
|
static const PLDHashTableOps AtomSelector_CSOps = {
|
|
PLDHashTable::HashVoidPtrKeyStub,
|
|
PLDHashTable::MatchEntryStub,
|
|
AtomSelector_MoveEntry,
|
|
AtomSelector_ClearEntry,
|
|
AtomSelector_InitEntry
|
|
};
|
|
|
|
// Case-insensitive ops.
|
|
static const PLDHashTableOps AtomSelector_CIOps = {
|
|
RuleHash_CIHashKey,
|
|
AtomSelector_CIMatchEntry,
|
|
AtomSelector_MoveEntry,
|
|
AtomSelector_ClearEntry,
|
|
AtomSelector_InitEntry
|
|
};
|
|
|
|
//--------------------------------
|
|
|
|
struct RuleCascadeData {
|
|
RuleCascadeData(nsIAtom *aMedium, bool aQuirksMode)
|
|
: mRuleHash(aQuirksMode),
|
|
mStateSelectors(),
|
|
mSelectorDocumentStates(0),
|
|
mClassSelectors(aQuirksMode ? &AtomSelector_CIOps
|
|
: &AtomSelector_CSOps,
|
|
sizeof(AtomSelectorEntry)),
|
|
mIdSelectors(aQuirksMode ? &AtomSelector_CIOps
|
|
: &AtomSelector_CSOps,
|
|
sizeof(AtomSelectorEntry)),
|
|
// mAttributeSelectors is matching on the attribute _name_, not the
|
|
// value, and we case-fold names at parse-time, so this is a
|
|
// case-sensitive match.
|
|
mAttributeSelectors(&AtomSelector_CSOps, sizeof(AtomSelectorEntry)),
|
|
mAnonBoxRules(&RuleHash_TagTable_Ops, sizeof(RuleHashTagTableEntry)),
|
|
#ifdef MOZ_XUL
|
|
mXULTreeRules(&RuleHash_TagTable_Ops, sizeof(RuleHashTagTableEntry)),
|
|
#endif
|
|
mKeyframesRuleTable(),
|
|
mCounterStyleRuleTable(),
|
|
mCacheKey(aMedium),
|
|
mNext(nullptr),
|
|
mQuirksMode(aQuirksMode)
|
|
{
|
|
memset(mPseudoElementRuleHashes, 0, sizeof(mPseudoElementRuleHashes));
|
|
}
|
|
|
|
~RuleCascadeData()
|
|
{
|
|
for (uint32_t i = 0; i < ArrayLength(mPseudoElementRuleHashes); ++i) {
|
|
delete mPseudoElementRuleHashes[i];
|
|
}
|
|
}
|
|
|
|
size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
|
|
|
|
RuleHash mRuleHash;
|
|
RuleHash* mPseudoElementRuleHashes[
|
|
static_cast<CSSPseudoElementTypeBase>(CSSPseudoElementType::Count)];
|
|
nsTArray<nsCSSRuleProcessor::StateSelector> mStateSelectors;
|
|
EventStates mSelectorDocumentStates;
|
|
PLDHashTable mClassSelectors;
|
|
PLDHashTable mIdSelectors;
|
|
nsTArray<nsCSSSelector*> mPossiblyNegatedClassSelectors;
|
|
nsTArray<nsCSSSelector*> mPossiblyNegatedIDSelectors;
|
|
PLDHashTable mAttributeSelectors;
|
|
PLDHashTable mAnonBoxRules;
|
|
#ifdef MOZ_XUL
|
|
PLDHashTable mXULTreeRules;
|
|
#endif
|
|
|
|
nsTArray<nsFontFaceRuleContainer> mFontFaceRules;
|
|
nsTArray<nsCSSKeyframesRule*> mKeyframesRules;
|
|
nsTArray<nsCSSFontFeatureValuesRule*> mFontFeatureValuesRules;
|
|
nsTArray<nsCSSPageRule*> mPageRules;
|
|
nsTArray<nsCSSCounterStyleRule*> mCounterStyleRules;
|
|
|
|
nsDataHashtable<nsStringHashKey, nsCSSKeyframesRule*> mKeyframesRuleTable;
|
|
nsDataHashtable<nsStringHashKey, nsCSSCounterStyleRule*> mCounterStyleRuleTable;
|
|
|
|
// Looks up or creates the appropriate list in |mAttributeSelectors|.
|
|
// Returns null only on allocation failure.
|
|
nsTArray<SelectorPair>* AttributeListFor(nsIAtom* aAttribute);
|
|
|
|
nsMediaQueryResultCacheKey mCacheKey;
|
|
RuleCascadeData* mNext; // for a different medium
|
|
|
|
const bool mQuirksMode;
|
|
};
|
|
|
|
static size_t
|
|
SizeOfSelectorsHashTable(const PLDHashTable& aTable, MallocSizeOf aMallocSizeOf)
|
|
{
|
|
size_t n = aTable.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
for (auto iter = aTable.ConstIter(); !iter.Done(); iter.Next()) {
|
|
auto entry = static_cast<AtomSelectorEntry*>(iter.Get());
|
|
n += entry->mSelectors.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
}
|
|
return n;
|
|
}
|
|
|
|
size_t
|
|
RuleCascadeData::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
|
|
{
|
|
size_t n = aMallocSizeOf(this);
|
|
|
|
n += mRuleHash.SizeOfExcludingThis(aMallocSizeOf);
|
|
for (uint32_t i = 0; i < ArrayLength(mPseudoElementRuleHashes); ++i) {
|
|
if (mPseudoElementRuleHashes[i])
|
|
n += mPseudoElementRuleHashes[i]->SizeOfIncludingThis(aMallocSizeOf);
|
|
}
|
|
|
|
n += mStateSelectors.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
|
|
n += SizeOfSelectorsHashTable(mIdSelectors, aMallocSizeOf);
|
|
n += SizeOfSelectorsHashTable(mClassSelectors, aMallocSizeOf);
|
|
|
|
n += mPossiblyNegatedClassSelectors.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
n += mPossiblyNegatedIDSelectors.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
|
|
n += SizeOfSelectorsHashTable(mAttributeSelectors, aMallocSizeOf);
|
|
n += SizeOfRuleHashTable(mAnonBoxRules, aMallocSizeOf);
|
|
#ifdef MOZ_XUL
|
|
n += SizeOfRuleHashTable(mXULTreeRules, aMallocSizeOf);
|
|
#endif
|
|
|
|
n += mFontFaceRules.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
n += mKeyframesRules.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
n += mFontFeatureValuesRules.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
n += mPageRules.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
n += mCounterStyleRules.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
|
|
n += mKeyframesRuleTable.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
for (auto iter = mKeyframesRuleTable.ConstIter(); !iter.Done(); iter.Next()) {
|
|
// We don't own the nsCSSKeyframesRule objects so we don't count them. We
|
|
// do care about the size of the keys' nsAString members' buffers though.
|
|
//
|
|
// Note that we depend on nsStringHashKey::GetKey() returning a reference,
|
|
// since otherwise aKey would be a copy of the string key and we would not
|
|
// be measuring the right object here.
|
|
n += iter.Key().SizeOfExcludingThisIfUnshared(aMallocSizeOf);
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
nsTArray<SelectorPair>*
|
|
RuleCascadeData::AttributeListFor(nsIAtom* aAttribute)
|
|
{
|
|
auto entry = static_cast<AtomSelectorEntry*>
|
|
(mAttributeSelectors.Add(aAttribute, fallible));
|
|
if (!entry)
|
|
return nullptr;
|
|
return &entry->mSelectors;
|
|
}
|
|
|
|
// -------------------------------
|
|
// CSS Style rule processor implementation
|
|
//
|
|
|
|
nsCSSRuleProcessor::nsCSSRuleProcessor(const sheet_array_type& aSheets,
|
|
SheetType aSheetType,
|
|
Element* aScopeElement,
|
|
nsCSSRuleProcessor*
|
|
aPreviousCSSRuleProcessor,
|
|
bool aIsShared)
|
|
: nsCSSRuleProcessor(sheet_array_type(aSheets), aSheetType, aScopeElement,
|
|
aPreviousCSSRuleProcessor, aIsShared)
|
|
{
|
|
}
|
|
|
|
nsCSSRuleProcessor::nsCSSRuleProcessor(sheet_array_type&& aSheets,
|
|
SheetType aSheetType,
|
|
Element* aScopeElement,
|
|
nsCSSRuleProcessor*
|
|
aPreviousCSSRuleProcessor,
|
|
bool aIsShared)
|
|
: mSheets(aSheets)
|
|
, mRuleCascades(nullptr)
|
|
, mPreviousCacheKey(aPreviousCSSRuleProcessor
|
|
? aPreviousCSSRuleProcessor->CloneMQCacheKey()
|
|
: UniquePtr<nsMediaQueryResultCacheKey>())
|
|
, mLastPresContext(nullptr)
|
|
, mScopeElement(aScopeElement)
|
|
, mStyleSetRefCnt(0)
|
|
, mSheetType(aSheetType)
|
|
, mIsShared(aIsShared)
|
|
, mMustGatherDocumentRules(aIsShared)
|
|
, mInRuleProcessorCache(false)
|
|
#ifdef DEBUG
|
|
, mDocumentRulesAndCacheKeyValid(false)
|
|
#endif
|
|
{
|
|
NS_ASSERTION(!!mScopeElement == (aSheetType == SheetType::ScopedDoc),
|
|
"aScopeElement must be specified iff aSheetType is "
|
|
"eScopedDocSheet");
|
|
for (sheet_array_type::size_type i = mSheets.Length(); i-- != 0; ) {
|
|
mSheets[i]->AddRuleProcessor(this);
|
|
}
|
|
}
|
|
|
|
nsCSSRuleProcessor::~nsCSSRuleProcessor()
|
|
{
|
|
if (mInRuleProcessorCache) {
|
|
RuleProcessorCache::RemoveRuleProcessor(this);
|
|
}
|
|
MOZ_ASSERT(!mExpirationState.IsTracked());
|
|
MOZ_ASSERT(mStyleSetRefCnt == 0);
|
|
ClearSheets();
|
|
ClearRuleCascades();
|
|
}
|
|
|
|
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsCSSRuleProcessor)
|
|
NS_INTERFACE_MAP_ENTRY(nsIStyleRuleProcessor)
|
|
NS_INTERFACE_MAP_END
|
|
|
|
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsCSSRuleProcessor)
|
|
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsCSSRuleProcessor)
|
|
|
|
NS_IMPL_CYCLE_COLLECTION_CLASS(nsCSSRuleProcessor)
|
|
|
|
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsCSSRuleProcessor)
|
|
tmp->ClearSheets();
|
|
NS_IMPL_CYCLE_COLLECTION_UNLINK(mScopeElement)
|
|
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
|
|
|
|
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsCSSRuleProcessor)
|
|
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSheets)
|
|
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mScopeElement)
|
|
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
|
|
|
|
void
|
|
nsCSSRuleProcessor::ClearSheets()
|
|
{
|
|
for (sheet_array_type::size_type i = mSheets.Length(); i-- != 0; ) {
|
|
mSheets[i]->DropRuleProcessor(this);
|
|
}
|
|
mSheets.Clear();
|
|
}
|
|
|
|
/* static */ void
|
|
nsCSSRuleProcessor::Startup()
|
|
{
|
|
Preferences::AddBoolVarCache(&gSupportVisitedPseudo, VISITED_PSEUDO_PREF,
|
|
true);
|
|
}
|
|
|
|
static bool
|
|
InitSystemMetrics()
|
|
{
|
|
NS_ASSERTION(!sSystemMetrics, "already initialized");
|
|
|
|
sSystemMetrics = new nsTArray< nsCOMPtr<nsIAtom> >;
|
|
NS_ENSURE_TRUE(sSystemMetrics, false);
|
|
|
|
/***************************************************************************
|
|
* ANY METRICS ADDED HERE SHOULD ALSO BE ADDED AS MEDIA QUERIES IN *
|
|
* nsMediaFeatures.cpp *
|
|
***************************************************************************/
|
|
|
|
int32_t metricResult =
|
|
LookAndFeel::GetInt(LookAndFeel::eIntID_ScrollArrowStyle);
|
|
if (metricResult & LookAndFeel::eScrollArrow_StartBackward) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::scrollbar_start_backward);
|
|
}
|
|
if (metricResult & LookAndFeel::eScrollArrow_StartForward) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::scrollbar_start_forward);
|
|
}
|
|
if (metricResult & LookAndFeel::eScrollArrow_EndBackward) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::scrollbar_end_backward);
|
|
}
|
|
if (metricResult & LookAndFeel::eScrollArrow_EndForward) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::scrollbar_end_forward);
|
|
}
|
|
|
|
metricResult =
|
|
LookAndFeel::GetInt(LookAndFeel::eIntID_ScrollSliderStyle);
|
|
if (metricResult != LookAndFeel::eScrollThumbStyle_Normal) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::scrollbar_thumb_proportional);
|
|
}
|
|
|
|
metricResult =
|
|
LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars);
|
|
if (metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::overlay_scrollbars);
|
|
}
|
|
|
|
metricResult =
|
|
LookAndFeel::GetInt(LookAndFeel::eIntID_MenuBarDrag);
|
|
if (metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::menubar_drag);
|
|
}
|
|
|
|
nsresult rv =
|
|
LookAndFeel::GetInt(LookAndFeel::eIntID_WindowsDefaultTheme, &metricResult);
|
|
if (NS_SUCCEEDED(rv) && metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::windows_default_theme);
|
|
}
|
|
|
|
rv = LookAndFeel::GetInt(LookAndFeel::eIntID_MacGraphiteTheme, &metricResult);
|
|
if (NS_SUCCEEDED(rv) && metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::mac_graphite_theme);
|
|
}
|
|
|
|
rv = LookAndFeel::GetInt(LookAndFeel::eIntID_MacLionTheme, &metricResult);
|
|
if (NS_SUCCEEDED(rv) && metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::mac_lion_theme);
|
|
}
|
|
|
|
rv = LookAndFeel::GetInt(LookAndFeel::eIntID_MacYosemiteTheme, &metricResult);
|
|
if (NS_SUCCEEDED(rv) && metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::mac_yosemite_theme);
|
|
}
|
|
|
|
rv = LookAndFeel::GetInt(LookAndFeel::eIntID_WindowsAccentColorApplies, &metricResult);
|
|
if (NS_SUCCEEDED(rv) && metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::windows_accent_color_applies);
|
|
}
|
|
|
|
rv = LookAndFeel::GetInt(LookAndFeel::eIntID_WindowsAccentColorIsDark, &metricResult);
|
|
if (NS_SUCCEEDED(rv) && metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::windows_accent_color_is_dark);
|
|
}
|
|
|
|
rv = LookAndFeel::GetInt(LookAndFeel::eIntID_DWMCompositor, &metricResult);
|
|
if (NS_SUCCEEDED(rv) && metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::windows_compositor);
|
|
}
|
|
|
|
rv = LookAndFeel::GetInt(LookAndFeel::eIntID_WindowsGlass, &metricResult);
|
|
if (NS_SUCCEEDED(rv) && metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::windows_glass);
|
|
}
|
|
|
|
rv = LookAndFeel::GetInt(LookAndFeel::eIntID_ColorPickerAvailable, &metricResult);
|
|
if (NS_SUCCEEDED(rv) && metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::color_picker_available);
|
|
}
|
|
|
|
rv = LookAndFeel::GetInt(LookAndFeel::eIntID_WindowsClassic, &metricResult);
|
|
if (NS_SUCCEEDED(rv) && metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::windows_classic);
|
|
}
|
|
|
|
rv = LookAndFeel::GetInt(LookAndFeel::eIntID_TouchEnabled, &metricResult);
|
|
if (NS_SUCCEEDED(rv) && metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::touch_enabled);
|
|
}
|
|
|
|
rv = LookAndFeel::GetInt(LookAndFeel::eIntID_SwipeAnimationEnabled,
|
|
&metricResult);
|
|
if (NS_SUCCEEDED(rv) && metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::swipe_animation_enabled);
|
|
}
|
|
|
|
rv = LookAndFeel::GetInt(LookAndFeel::eIntID_PhysicalHomeButton,
|
|
&metricResult);
|
|
if (NS_SUCCEEDED(rv) && metricResult) {
|
|
sSystemMetrics->AppendElement(nsGkAtoms::physical_home_button);
|
|
}
|
|
|
|
#ifdef XP_WIN
|
|
if (NS_SUCCEEDED(
|
|
LookAndFeel::GetInt(LookAndFeel::eIntID_WindowsThemeIdentifier,
|
|
&metricResult))) {
|
|
nsCSSRuleProcessor::SetWindowsThemeIdentifier(static_cast<uint8_t>(metricResult));
|
|
switch(metricResult) {
|
|
case LookAndFeel::eWindowsTheme_Aero:
|
|
sSystemMetrics->AppendElement(nsGkAtoms::windows_theme_aero);
|
|
break;
|
|
case LookAndFeel::eWindowsTheme_AeroLite:
|
|
sSystemMetrics->AppendElement(nsGkAtoms::windows_theme_aero_lite);
|
|
break;
|
|
case LookAndFeel::eWindowsTheme_LunaBlue:
|
|
sSystemMetrics->AppendElement(nsGkAtoms::windows_theme_luna_blue);
|
|
break;
|
|
case LookAndFeel::eWindowsTheme_LunaOlive:
|
|
sSystemMetrics->AppendElement(nsGkAtoms::windows_theme_luna_olive);
|
|
break;
|
|
case LookAndFeel::eWindowsTheme_LunaSilver:
|
|
sSystemMetrics->AppendElement(nsGkAtoms::windows_theme_luna_silver);
|
|
break;
|
|
case LookAndFeel::eWindowsTheme_Royale:
|
|
sSystemMetrics->AppendElement(nsGkAtoms::windows_theme_royale);
|
|
break;
|
|
case LookAndFeel::eWindowsTheme_Zune:
|
|
sSystemMetrics->AppendElement(nsGkAtoms::windows_theme_zune);
|
|
break;
|
|
case LookAndFeel::eWindowsTheme_Generic:
|
|
sSystemMetrics->AppendElement(nsGkAtoms::windows_theme_generic);
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return true;
|
|
}
|
|
|
|
/* static */ void
|
|
nsCSSRuleProcessor::FreeSystemMetrics()
|
|
{
|
|
delete sSystemMetrics;
|
|
sSystemMetrics = nullptr;
|
|
}
|
|
|
|
/* static */ void
|
|
nsCSSRuleProcessor::Shutdown()
|
|
{
|
|
FreeSystemMetrics();
|
|
}
|
|
|
|
/* static */ bool
|
|
nsCSSRuleProcessor::HasSystemMetric(nsIAtom* aMetric)
|
|
{
|
|
if (!sSystemMetrics && !InitSystemMetrics()) {
|
|
return false;
|
|
}
|
|
return sSystemMetrics->IndexOf(aMetric) != sSystemMetrics->NoIndex;
|
|
}
|
|
|
|
#ifdef XP_WIN
|
|
/* static */ uint8_t
|
|
nsCSSRuleProcessor::GetWindowsThemeIdentifier()
|
|
{
|
|
if (!sSystemMetrics)
|
|
InitSystemMetrics();
|
|
return sWinThemeId;
|
|
}
|
|
#endif
|
|
|
|
/* static */
|
|
EventStates
|
|
nsCSSRuleProcessor::GetContentState(Element* aElement, const TreeMatchContext& aTreeMatchContext)
|
|
{
|
|
EventStates state = aElement->StyleState();
|
|
|
|
// If we are not supposed to mark visited links as such, be sure to
|
|
// flip the bits appropriately. We want to do this here, rather
|
|
// than in GetContentStateForVisitedHandling, so that we don't
|
|
// expose that :visited support is disabled to the Web page.
|
|
if (state.HasState(NS_EVENT_STATE_VISITED) &&
|
|
(!gSupportVisitedPseudo ||
|
|
aElement->OwnerDoc()->IsBeingUsedAsImage() ||
|
|
aTreeMatchContext.mUsingPrivateBrowsing)) {
|
|
state &= ~NS_EVENT_STATE_VISITED;
|
|
state |= NS_EVENT_STATE_UNVISITED;
|
|
}
|
|
return state;
|
|
}
|
|
|
|
/* static */
|
|
bool
|
|
nsCSSRuleProcessor::IsLink(const Element* aElement)
|
|
{
|
|
EventStates state = aElement->StyleState();
|
|
return state.HasAtLeastOneOfStates(NS_EVENT_STATE_VISITED | NS_EVENT_STATE_UNVISITED);
|
|
}
|
|
|
|
/* static */
|
|
EventStates
|
|
nsCSSRuleProcessor::GetContentStateForVisitedHandling(
|
|
Element* aElement,
|
|
const TreeMatchContext& aTreeMatchContext,
|
|
nsRuleWalker::VisitedHandlingType aVisitedHandling,
|
|
bool aIsRelevantLink)
|
|
{
|
|
EventStates contentState = GetContentState(aElement, aTreeMatchContext);
|
|
if (contentState.HasAtLeastOneOfStates(NS_EVENT_STATE_VISITED | NS_EVENT_STATE_UNVISITED)) {
|
|
MOZ_ASSERT(IsLink(aElement), "IsLink() should match state");
|
|
contentState &= ~(NS_EVENT_STATE_VISITED | NS_EVENT_STATE_UNVISITED);
|
|
if (aIsRelevantLink) {
|
|
switch (aVisitedHandling) {
|
|
case nsRuleWalker::eRelevantLinkUnvisited:
|
|
contentState |= NS_EVENT_STATE_UNVISITED;
|
|
break;
|
|
case nsRuleWalker::eRelevantLinkVisited:
|
|
contentState |= NS_EVENT_STATE_VISITED;
|
|
break;
|
|
case nsRuleWalker::eLinksVisitedOrUnvisited:
|
|
contentState |= NS_EVENT_STATE_UNVISITED | NS_EVENT_STATE_VISITED;
|
|
break;
|
|
}
|
|
} else {
|
|
contentState |= NS_EVENT_STATE_UNVISITED;
|
|
}
|
|
}
|
|
return contentState;
|
|
}
|
|
|
|
/**
|
|
* A |NodeMatchContext| has data about matching a selector (without
|
|
* combinators) against a single node. It contains only input to the
|
|
* matching.
|
|
*
|
|
* Unlike |RuleProcessorData|, which is similar, a |NodeMatchContext|
|
|
* can vary depending on the selector matching process. In other words,
|
|
* there might be multiple NodeMatchContexts corresponding to a single
|
|
* node, but only one possible RuleProcessorData.
|
|
*/
|
|
struct NodeMatchContext {
|
|
// In order to implement nsCSSRuleProcessor::HasStateDependentStyle,
|
|
// we need to be able to see if a node might match an
|
|
// event-state-dependent selector for any value of that event state.
|
|
// So mStateMask contains the states that should NOT be tested.
|
|
//
|
|
// NOTE: For |mStateMask| to work correctly, it's important that any
|
|
// change that changes multiple state bits include all those state
|
|
// bits in the notification. Otherwise, if multiple states change but
|
|
// we do separate notifications then we might determine the style is
|
|
// not state-dependent when it really is (e.g., determining that a
|
|
// :hover:active rule no longer matches when both states are unset).
|
|
const EventStates mStateMask;
|
|
|
|
// Is this link the unique link whose visitedness can affect the style
|
|
// of the node being matched? (That link is the nearest link to the
|
|
// node being matched that is itself or an ancestor.)
|
|
//
|
|
// Always false when TreeMatchContext::mForStyling is false. (We
|
|
// could figure it out for SelectorListMatches, but we're starting
|
|
// from the middle of the selector list when doing
|
|
// Has{Attribute,State}DependentStyle, so we can't tell. So when
|
|
// mForStyling is false, we have to assume we don't know.)
|
|
const bool mIsRelevantLink;
|
|
|
|
NodeMatchContext(EventStates aStateMask, bool aIsRelevantLink)
|
|
: mStateMask(aStateMask)
|
|
, mIsRelevantLink(aIsRelevantLink)
|
|
{
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Additional information about a selector (without combinators) that is
|
|
* being matched.
|
|
*/
|
|
enum class SelectorMatchesFlags : uint8_t {
|
|
NONE = 0,
|
|
|
|
// The selector's flags are unknown. This happens when you don't know
|
|
// if you're starting from the top of a selector. Only used in cases
|
|
// where it's acceptable for matching to return a false positive.
|
|
// (It's not OK to return a false negative.)
|
|
UNKNOWN = 1 << 0,
|
|
|
|
// The selector is part of a compound selector which has been split in
|
|
// half, where the other half is a pseudo-element. The current
|
|
// selector is not a pseudo-element itself.
|
|
HAS_PSEUDO_ELEMENT = 1 << 1,
|
|
|
|
// The selector is part of an argument to a functional pseudo-class or
|
|
// pseudo-element.
|
|
IS_PSEUDO_CLASS_ARGUMENT = 1 << 2
|
|
};
|
|
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(SelectorMatchesFlags)
|
|
|
|
// Return whether the selector matches conditions for the :active and
|
|
// :hover quirk.
|
|
static inline bool ActiveHoverQuirkMatches(nsCSSSelector* aSelector,
|
|
SelectorMatchesFlags aSelectorFlags)
|
|
{
|
|
if (aSelector->HasTagSelector() || aSelector->mAttrList ||
|
|
aSelector->mIDList || aSelector->mClassList ||
|
|
aSelector->IsPseudoElement() ||
|
|
// Having this quirk means that some selectors will no longer match,
|
|
// so it's better to return false when we aren't sure (i.e., the
|
|
// flags are unknown).
|
|
aSelectorFlags & (SelectorMatchesFlags::UNKNOWN |
|
|
SelectorMatchesFlags::HAS_PSEUDO_ELEMENT |
|
|
SelectorMatchesFlags::IS_PSEUDO_CLASS_ARGUMENT)) {
|
|
return false;
|
|
}
|
|
|
|
// No pseudo-class other than :active and :hover.
|
|
for (nsPseudoClassList* pseudoClass = aSelector->mPseudoClassList;
|
|
pseudoClass; pseudoClass = pseudoClass->mNext) {
|
|
if (pseudoClass->mType != CSSPseudoClassType::hover &&
|
|
pseudoClass->mType != CSSPseudoClassType::active) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
static inline bool
|
|
IsSignificantChild(nsIContent* aChild, bool aTextIsSignificant,
|
|
bool aWhitespaceIsSignificant)
|
|
{
|
|
return nsStyleUtil::IsSignificantChild(aChild, aTextIsSignificant,
|
|
aWhitespaceIsSignificant);
|
|
}
|
|
|
|
// This function is to be called once we have fetched a value for an attribute
|
|
// whose namespace and name match those of aAttrSelector. This function
|
|
// performs comparisons on the value only, based on aAttrSelector->mFunction.
|
|
static bool AttrMatchesValue(const nsAttrSelector* aAttrSelector,
|
|
const nsString& aValue, bool isHTML)
|
|
{
|
|
NS_PRECONDITION(aAttrSelector, "Must have an attribute selector");
|
|
|
|
// http://lists.w3.org/Archives/Public/www-style/2008Apr/0038.html
|
|
// *= (CONTAINSMATCH) ~= (INCLUDES) ^= (BEGINSMATCH) $= (ENDSMATCH)
|
|
// all accept the empty string, but match nothing.
|
|
if (aAttrSelector->mValue.IsEmpty() &&
|
|
(aAttrSelector->mFunction == NS_ATTR_FUNC_INCLUDES ||
|
|
aAttrSelector->mFunction == NS_ATTR_FUNC_ENDSMATCH ||
|
|
aAttrSelector->mFunction == NS_ATTR_FUNC_BEGINSMATCH ||
|
|
aAttrSelector->mFunction == NS_ATTR_FUNC_CONTAINSMATCH))
|
|
return false;
|
|
|
|
const nsDefaultStringComparator defaultComparator;
|
|
const nsASCIICaseInsensitiveStringComparator ciComparator;
|
|
const nsStringComparator& comparator =
|
|
aAttrSelector->IsValueCaseSensitive(isHTML)
|
|
? static_cast<const nsStringComparator&>(defaultComparator)
|
|
: static_cast<const nsStringComparator&>(ciComparator);
|
|
|
|
switch (aAttrSelector->mFunction) {
|
|
case NS_ATTR_FUNC_EQUALS:
|
|
return aValue.Equals(aAttrSelector->mValue, comparator);
|
|
case NS_ATTR_FUNC_INCLUDES:
|
|
return nsStyleUtil::ValueIncludes(aValue, aAttrSelector->mValue, comparator);
|
|
case NS_ATTR_FUNC_DASHMATCH:
|
|
return nsStyleUtil::DashMatchCompare(aValue, aAttrSelector->mValue, comparator);
|
|
case NS_ATTR_FUNC_ENDSMATCH:
|
|
return StringEndsWith(aValue, aAttrSelector->mValue, comparator);
|
|
case NS_ATTR_FUNC_BEGINSMATCH:
|
|
return StringBeginsWith(aValue, aAttrSelector->mValue, comparator);
|
|
case NS_ATTR_FUNC_CONTAINSMATCH:
|
|
return FindInReadable(aAttrSelector->mValue, aValue, comparator);
|
|
default:
|
|
NS_NOTREACHED("Shouldn't be ending up here");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static inline bool
|
|
edgeChildMatches(Element* aElement, TreeMatchContext& aTreeMatchContext,
|
|
bool checkFirst, bool checkLast)
|
|
{
|
|
nsIContent* parent = aElement->GetParent();
|
|
if (parent && aTreeMatchContext.mForStyling)
|
|
parent->SetFlags(NODE_HAS_EDGE_CHILD_SELECTOR);
|
|
|
|
return (!checkFirst ||
|
|
aTreeMatchContext.mNthIndexCache.
|
|
GetNthIndex(aElement, false, false, true) == 1) &&
|
|
(!checkLast ||
|
|
aTreeMatchContext.mNthIndexCache.
|
|
GetNthIndex(aElement, false, true, true) == 1);
|
|
}
|
|
|
|
static inline bool
|
|
nthChildGenericMatches(Element* aElement,
|
|
TreeMatchContext& aTreeMatchContext,
|
|
nsPseudoClassList* pseudoClass,
|
|
bool isOfType, bool isFromEnd)
|
|
{
|
|
nsIContent* parent = aElement->GetParent();
|
|
if (parent && aTreeMatchContext.mForStyling) {
|
|
if (isFromEnd)
|
|
parent->SetFlags(NODE_HAS_SLOW_SELECTOR);
|
|
else
|
|
parent->SetFlags(NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS);
|
|
}
|
|
|
|
const int32_t index = aTreeMatchContext.mNthIndexCache.
|
|
GetNthIndex(aElement, isOfType, isFromEnd, false);
|
|
if (index <= 0) {
|
|
// Node is anonymous content (not really a child of its parent).
|
|
return false;
|
|
}
|
|
|
|
const int32_t a = pseudoClass->u.mNumbers[0];
|
|
const int32_t b = pseudoClass->u.mNumbers[1];
|
|
// result should be true if there exists n >= 0 such that
|
|
// a * n + b == index.
|
|
if (a == 0) {
|
|
return b == index;
|
|
}
|
|
|
|
// Integer division in C does truncation (towards 0). So
|
|
// check that the result is nonnegative, and that there was no
|
|
// truncation.
|
|
const CheckedInt<int32_t> indexMinusB = CheckedInt<int32_t>(index) - b;
|
|
const CheckedInt<int32_t> n = indexMinusB / a;
|
|
return n.isValid() &&
|
|
n.value() >= 0 &&
|
|
a * n == indexMinusB;
|
|
}
|
|
|
|
static inline bool
|
|
edgeOfTypeMatches(Element* aElement, TreeMatchContext& aTreeMatchContext,
|
|
bool checkFirst, bool checkLast)
|
|
{
|
|
nsIContent *parent = aElement->GetParent();
|
|
if (parent && aTreeMatchContext.mForStyling) {
|
|
if (checkLast)
|
|
parent->SetFlags(NODE_HAS_SLOW_SELECTOR);
|
|
else
|
|
parent->SetFlags(NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS);
|
|
}
|
|
|
|
return (!checkFirst ||
|
|
aTreeMatchContext.mNthIndexCache.
|
|
GetNthIndex(aElement, true, false, true) == 1) &&
|
|
(!checkLast ||
|
|
aTreeMatchContext.mNthIndexCache.
|
|
GetNthIndex(aElement, true, true, true) == 1);
|
|
}
|
|
|
|
static inline bool
|
|
checkGenericEmptyMatches(Element* aElement,
|
|
TreeMatchContext& aTreeMatchContext,
|
|
bool isWhitespaceSignificant)
|
|
{
|
|
nsIContent *child = nullptr;
|
|
int32_t index = -1;
|
|
|
|
if (aTreeMatchContext.mForStyling)
|
|
aElement->SetFlags(NODE_HAS_EMPTY_SELECTOR);
|
|
|
|
do {
|
|
child = aElement->GetChildAt(++index);
|
|
// stop at first non-comment (and non-whitespace for
|
|
// :-moz-only-whitespace) node
|
|
} while (child && !IsSignificantChild(child, true, isWhitespaceSignificant));
|
|
return (child == nullptr);
|
|
}
|
|
|
|
// Arrays of the states that are relevant for various pseudoclasses.
|
|
static const EventStates sPseudoClassStateDependences[] = {
|
|
#define CSS_PSEUDO_CLASS(_name, _value, _flags, _pref) \
|
|
EventStates(),
|
|
#define CSS_STATE_DEPENDENT_PSEUDO_CLASS(_name, _value, _flags, _pref, _states) \
|
|
_states,
|
|
#include "nsCSSPseudoClassList.h"
|
|
#undef CSS_STATE_DEPENDENT_PSEUDO_CLASS
|
|
#undef CSS_PSEUDO_CLASS
|
|
// Add more entries for our fake values to make sure we can't
|
|
// index out of bounds into this array no matter what.
|
|
EventStates(),
|
|
EventStates()
|
|
};
|
|
|
|
static const EventStates sPseudoClassStates[] = {
|
|
#define CSS_PSEUDO_CLASS(_name, _value, _flags, _pref) \
|
|
EventStates(),
|
|
#define CSS_STATE_PSEUDO_CLASS(_name, _value, _flags, _pref, _states) \
|
|
_states,
|
|
#include "nsCSSPseudoClassList.h"
|
|
#undef CSS_STATE_PSEUDO_CLASS
|
|
#undef CSS_PSEUDO_CLASS
|
|
// Add more entries for our fake values to make sure we can't
|
|
// index out of bounds into this array no matter what.
|
|
EventStates(),
|
|
EventStates()
|
|
};
|
|
static_assert(MOZ_ARRAY_LENGTH(sPseudoClassStates) ==
|
|
static_cast<size_t>(CSSPseudoClassType::MAX),
|
|
"CSSPseudoClassType::MAX is no longer equal to the length of "
|
|
"sPseudoClassStates");
|
|
|
|
static bool
|
|
StateSelectorMatches(Element* aElement,
|
|
nsCSSSelector* aSelector,
|
|
NodeMatchContext& aNodeMatchContext,
|
|
TreeMatchContext& aTreeMatchContext,
|
|
SelectorMatchesFlags aSelectorFlags,
|
|
bool* const aDependence,
|
|
EventStates aStatesToCheck)
|
|
{
|
|
NS_PRECONDITION(!aStatesToCheck.IsEmpty(),
|
|
"should only need to call StateSelectorMatches if "
|
|
"aStatesToCheck is not empty");
|
|
|
|
// Bit-based pseudo-classes
|
|
if (aStatesToCheck.HasAtLeastOneOfStates(NS_EVENT_STATE_ACTIVE |
|
|
NS_EVENT_STATE_HOVER) &&
|
|
aTreeMatchContext.mCompatMode == eCompatibility_NavQuirks &&
|
|
ActiveHoverQuirkMatches(aSelector, aSelectorFlags) &&
|
|
aElement->IsHTMLElement() && !nsCSSRuleProcessor::IsLink(aElement)) {
|
|
// In quirks mode, only make links sensitive to selectors ":active"
|
|
// and ":hover".
|
|
return false;
|
|
}
|
|
|
|
if (aTreeMatchContext.mForStyling &&
|
|
aStatesToCheck.HasAtLeastOneOfStates(NS_EVENT_STATE_HOVER)) {
|
|
// Mark the element as having :hover-dependent style
|
|
aElement->SetHasRelevantHoverRules();
|
|
}
|
|
|
|
if (aNodeMatchContext.mStateMask.HasAtLeastOneOfStates(aStatesToCheck)) {
|
|
if (aDependence) {
|
|
*aDependence = true;
|
|
}
|
|
} else {
|
|
EventStates contentState =
|
|
nsCSSRuleProcessor::GetContentStateForVisitedHandling(
|
|
aElement,
|
|
aTreeMatchContext,
|
|
aTreeMatchContext.VisitedHandling(),
|
|
aNodeMatchContext.mIsRelevantLink);
|
|
if (!contentState.HasAtLeastOneOfStates(aStatesToCheck)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
StateSelectorMatches(Element* aElement,
|
|
nsCSSSelector* aSelector,
|
|
NodeMatchContext& aNodeMatchContext,
|
|
TreeMatchContext& aTreeMatchContext,
|
|
SelectorMatchesFlags aSelectorFlags)
|
|
{
|
|
for (nsPseudoClassList* pseudoClass = aSelector->mPseudoClassList;
|
|
pseudoClass; pseudoClass = pseudoClass->mNext) {
|
|
auto idx = static_cast<CSSPseudoClassTypeBase>(pseudoClass->mType);
|
|
EventStates statesToCheck = sPseudoClassStates[idx];
|
|
if (!statesToCheck.IsEmpty() &&
|
|
!StateSelectorMatches(aElement, aSelector, aNodeMatchContext,
|
|
aTreeMatchContext, aSelectorFlags, nullptr,
|
|
statesToCheck)) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// |aDependence| has two functions:
|
|
// * when non-null, it indicates that we're processing a negation,
|
|
// which is done only when SelectorMatches calls itself recursively
|
|
// * what it points to should be set to true whenever a test is skipped
|
|
// because of aNodeMatchContent.mStateMask
|
|
static bool SelectorMatches(Element* aElement,
|
|
nsCSSSelector* aSelector,
|
|
NodeMatchContext& aNodeMatchContext,
|
|
TreeMatchContext& aTreeMatchContext,
|
|
SelectorMatchesFlags aSelectorFlags,
|
|
bool* const aDependence = nullptr)
|
|
{
|
|
NS_PRECONDITION(!aSelector->IsPseudoElement(),
|
|
"Pseudo-element snuck into SelectorMatches?");
|
|
MOZ_ASSERT(aTreeMatchContext.mForStyling ||
|
|
!aNodeMatchContext.mIsRelevantLink,
|
|
"mIsRelevantLink should be set to false when mForStyling "
|
|
"is false since we don't know how to set it correctly in "
|
|
"Has(Attribute|State)DependentStyle");
|
|
|
|
// namespace/tag match
|
|
// optimization : bail out early if we can
|
|
if ((kNameSpaceID_Unknown != aSelector->mNameSpace &&
|
|
aElement->GetNameSpaceID() != aSelector->mNameSpace))
|
|
return false;
|
|
|
|
if (aSelector->mLowercaseTag) {
|
|
nsIAtom* selectorTag =
|
|
(aTreeMatchContext.mIsHTMLDocument && aElement->IsHTMLElement()) ?
|
|
aSelector->mLowercaseTag : aSelector->mCasedTag;
|
|
if (selectorTag != aElement->NodeInfo()->NameAtom()) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
nsAtomList* IDList = aSelector->mIDList;
|
|
if (IDList) {
|
|
nsIAtom* id = aElement->GetID();
|
|
if (id) {
|
|
// case sensitivity: bug 93371
|
|
const bool isCaseSensitive =
|
|
aTreeMatchContext.mCompatMode != eCompatibility_NavQuirks;
|
|
|
|
if (isCaseSensitive) {
|
|
do {
|
|
if (IDList->mAtom != id) {
|
|
return false;
|
|
}
|
|
IDList = IDList->mNext;
|
|
} while (IDList);
|
|
} else {
|
|
// Use EqualsIgnoreASCIICase instead of full on unicode case conversion
|
|
// in order to save on performance. This is only used in quirks mode
|
|
// anyway.
|
|
nsDependentAtomString id1Str(id);
|
|
do {
|
|
if (!nsContentUtils::EqualsIgnoreASCIICase(id1Str,
|
|
nsDependentAtomString(IDList->mAtom))) {
|
|
return false;
|
|
}
|
|
IDList = IDList->mNext;
|
|
} while (IDList);
|
|
}
|
|
} else {
|
|
// Element has no id but we have an id selector
|
|
return false;
|
|
}
|
|
}
|
|
|
|
nsAtomList* classList = aSelector->mClassList;
|
|
if (classList) {
|
|
// test for class match
|
|
const nsAttrValue *elementClasses = aElement->GetClasses();
|
|
if (!elementClasses) {
|
|
// Element has no classes but we have a class selector
|
|
return false;
|
|
}
|
|
|
|
// case sensitivity: bug 93371
|
|
const bool isCaseSensitive =
|
|
aTreeMatchContext.mCompatMode != eCompatibility_NavQuirks;
|
|
|
|
while (classList) {
|
|
if (!elementClasses->Contains(classList->mAtom,
|
|
isCaseSensitive ?
|
|
eCaseMatters : eIgnoreCase)) {
|
|
return false;
|
|
}
|
|
classList = classList->mNext;
|
|
}
|
|
}
|
|
|
|
const bool isNegated = (aDependence != nullptr);
|
|
// The selectors for which we set node bits are, unfortunately, early
|
|
// in this function (because they're pseudo-classes, which are
|
|
// generally quick to test, and thus earlier). If they were later,
|
|
// we'd probably avoid setting those bits in more cases where setting
|
|
// them is unnecessary.
|
|
NS_ASSERTION(aNodeMatchContext.mStateMask.IsEmpty() ||
|
|
!aTreeMatchContext.mForStyling,
|
|
"mForStyling must be false if we're just testing for "
|
|
"state-dependence");
|
|
|
|
// test for pseudo class match
|
|
for (nsPseudoClassList* pseudoClass = aSelector->mPseudoClassList;
|
|
pseudoClass; pseudoClass = pseudoClass->mNext) {
|
|
auto idx = static_cast<CSSPseudoClassTypeBase>(pseudoClass->mType);
|
|
EventStates statesToCheck = sPseudoClassStates[idx];
|
|
if (statesToCheck.IsEmpty()) {
|
|
// keep the cases here in the same order as the list in
|
|
// nsCSSPseudoClassList.h
|
|
switch (pseudoClass->mType) {
|
|
case CSSPseudoClassType::empty:
|
|
if (!checkGenericEmptyMatches(aElement, aTreeMatchContext, true)) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::mozOnlyWhitespace:
|
|
if (!checkGenericEmptyMatches(aElement, aTreeMatchContext, false)) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::mozEmptyExceptChildrenWithLocalname:
|
|
{
|
|
NS_ASSERTION(pseudoClass->u.mString, "Must have string!");
|
|
nsIContent *child = nullptr;
|
|
int32_t index = -1;
|
|
|
|
if (aTreeMatchContext.mForStyling)
|
|
// FIXME: This isn't sufficient to handle:
|
|
// :-moz-empty-except-children-with-localname() + E
|
|
// :-moz-empty-except-children-with-localname() ~ E
|
|
// because we don't know to restyle the grandparent of the
|
|
// inserted/removed element (as in bug 534804 for :empty).
|
|
aElement->SetFlags(NODE_HAS_SLOW_SELECTOR);
|
|
do {
|
|
child = aElement->GetChildAt(++index);
|
|
} while (child &&
|
|
(!IsSignificantChild(child, true, false) ||
|
|
(child->GetNameSpaceID() == aElement->GetNameSpaceID() &&
|
|
child->NodeInfo()->NameAtom()->Equals(nsDependentString(pseudoClass->u.mString)))));
|
|
if (child != nullptr) {
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::lang:
|
|
{
|
|
NS_ASSERTION(nullptr != pseudoClass->u.mString, "null lang parameter");
|
|
if (!pseudoClass->u.mString || !*pseudoClass->u.mString) {
|
|
return false;
|
|
}
|
|
|
|
// We have to determine the language of the current element. Since
|
|
// this is currently no property and since the language is inherited
|
|
// from the parent we have to be prepared to look at all parent
|
|
// nodes. The language itself is encoded in the LANG attribute.
|
|
nsAutoString language;
|
|
if (aElement->GetLang(language)) {
|
|
if (!nsStyleUtil::DashMatchCompare(language,
|
|
nsDependentString(pseudoClass->u.mString),
|
|
nsASCIICaseInsensitiveStringComparator())) {
|
|
return false;
|
|
}
|
|
// This pseudo-class matched; move on to the next thing
|
|
break;
|
|
}
|
|
|
|
nsIDocument* doc = aTreeMatchContext.mDocument;
|
|
if (doc) {
|
|
// Try to get the language from the HTTP header or if this
|
|
// is missing as well from the preferences.
|
|
// The content language can be a comma-separated list of
|
|
// language codes.
|
|
doc->GetContentLanguage(language);
|
|
|
|
nsDependentString langString(pseudoClass->u.mString);
|
|
language.StripWhitespace();
|
|
int32_t begin = 0;
|
|
int32_t len = language.Length();
|
|
while (begin < len) {
|
|
int32_t end = language.FindChar(char16_t(','), begin);
|
|
if (end == kNotFound) {
|
|
end = len;
|
|
}
|
|
if (nsStyleUtil::DashMatchCompare(Substring(language, begin,
|
|
end-begin),
|
|
langString,
|
|
nsASCIICaseInsensitiveStringComparator())) {
|
|
break;
|
|
}
|
|
begin = end + 1;
|
|
}
|
|
if (begin < len) {
|
|
// This pseudo-class matched
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
|
|
case CSSPseudoClassType::mozBoundElement:
|
|
if (aTreeMatchContext.mScopedRoot != aElement) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::root:
|
|
if (aElement != aElement->OwnerDoc()->GetRootElement()) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::any:
|
|
{
|
|
nsCSSSelectorList *l;
|
|
for (l = pseudoClass->u.mSelectors; l; l = l->mNext) {
|
|
nsCSSSelector *s = l->mSelectors;
|
|
MOZ_ASSERT(!s->mNext && !s->IsPseudoElement(),
|
|
"parser failed");
|
|
if (SelectorMatches(
|
|
aElement, s, aNodeMatchContext, aTreeMatchContext,
|
|
SelectorMatchesFlags::IS_PSEUDO_CLASS_ARGUMENT)) {
|
|
break;
|
|
}
|
|
}
|
|
if (!l) {
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::firstChild:
|
|
if (!edgeChildMatches(aElement, aTreeMatchContext, true, false)) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::firstNode:
|
|
{
|
|
nsIContent *firstNode = nullptr;
|
|
nsIContent *parent = aElement->GetParent();
|
|
if (parent) {
|
|
if (aTreeMatchContext.mForStyling)
|
|
parent->SetFlags(NODE_HAS_EDGE_CHILD_SELECTOR);
|
|
|
|
int32_t index = -1;
|
|
do {
|
|
firstNode = parent->GetChildAt(++index);
|
|
// stop at first non-comment and non-whitespace node
|
|
} while (firstNode &&
|
|
!IsSignificantChild(firstNode, true, false));
|
|
}
|
|
if (aElement != firstNode) {
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::lastChild:
|
|
if (!edgeChildMatches(aElement, aTreeMatchContext, false, true)) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::lastNode:
|
|
{
|
|
nsIContent *lastNode = nullptr;
|
|
nsIContent *parent = aElement->GetParent();
|
|
if (parent) {
|
|
if (aTreeMatchContext.mForStyling)
|
|
parent->SetFlags(NODE_HAS_EDGE_CHILD_SELECTOR);
|
|
|
|
uint32_t index = parent->GetChildCount();
|
|
do {
|
|
lastNode = parent->GetChildAt(--index);
|
|
// stop at first non-comment and non-whitespace node
|
|
} while (lastNode &&
|
|
!IsSignificantChild(lastNode, true, false));
|
|
}
|
|
if (aElement != lastNode) {
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::onlyChild:
|
|
if (!edgeChildMatches(aElement, aTreeMatchContext, true, true)) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::firstOfType:
|
|
if (!edgeOfTypeMatches(aElement, aTreeMatchContext, true, false)) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::lastOfType:
|
|
if (!edgeOfTypeMatches(aElement, aTreeMatchContext, false, true)) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::onlyOfType:
|
|
if (!edgeOfTypeMatches(aElement, aTreeMatchContext, true, true)) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::nthChild:
|
|
if (!nthChildGenericMatches(aElement, aTreeMatchContext, pseudoClass,
|
|
false, false)) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::nthLastChild:
|
|
if (!nthChildGenericMatches(aElement, aTreeMatchContext, pseudoClass,
|
|
false, true)) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::nthOfType:
|
|
if (!nthChildGenericMatches(aElement, aTreeMatchContext, pseudoClass,
|
|
true, false)) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::nthLastOfType:
|
|
if (!nthChildGenericMatches(aElement, aTreeMatchContext, pseudoClass,
|
|
true, true)) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::mozIsHTML:
|
|
if (!aTreeMatchContext.mIsHTMLDocument || !aElement->IsHTMLElement()) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::mozNativeAnonymous:
|
|
if (!aElement->IsInNativeAnonymousSubtree()) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::mozSystemMetric:
|
|
{
|
|
nsCOMPtr<nsIAtom> metric = NS_Atomize(pseudoClass->u.mString);
|
|
if (!nsCSSRuleProcessor::HasSystemMetric(metric)) {
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::mozLocaleDir:
|
|
{
|
|
bool docIsRTL =
|
|
aTreeMatchContext.mDocument->GetDocumentState().
|
|
HasState(NS_DOCUMENT_STATE_RTL_LOCALE);
|
|
|
|
nsDependentString dirString(pseudoClass->u.mString);
|
|
|
|
if (dirString.EqualsLiteral("rtl")) {
|
|
if (!docIsRTL) {
|
|
return false;
|
|
}
|
|
} else if (dirString.EqualsLiteral("ltr")) {
|
|
if (docIsRTL) {
|
|
return false;
|
|
}
|
|
} else {
|
|
// Selectors specifying other directions never match.
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::mozLWTheme:
|
|
{
|
|
if (aTreeMatchContext.mDocument->GetDocumentLWTheme() <=
|
|
nsIDocument::Doc_Theme_None) {
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::mozLWThemeBrightText:
|
|
{
|
|
if (aTreeMatchContext.mDocument->GetDocumentLWTheme() !=
|
|
nsIDocument::Doc_Theme_Bright) {
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::mozLWThemeDarkText:
|
|
{
|
|
if (aTreeMatchContext.mDocument->GetDocumentLWTheme() !=
|
|
nsIDocument::Doc_Theme_Dark) {
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::mozWindowInactive:
|
|
if (!aTreeMatchContext.mDocument->GetDocumentState().
|
|
HasState(NS_DOCUMENT_STATE_WINDOW_INACTIVE)) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::mozTableBorderNonzero:
|
|
{
|
|
if (!aElement->IsHTMLElement(nsGkAtoms::table)) {
|
|
return false;
|
|
}
|
|
const nsAttrValue *val = aElement->GetParsedAttr(nsGkAtoms::border);
|
|
if (!val ||
|
|
(val->Type() == nsAttrValue::eInteger &&
|
|
val->GetIntegerValue() == 0)) {
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::mozBrowserFrame:
|
|
{
|
|
nsCOMPtr<nsIMozBrowserFrame>
|
|
browserFrame = do_QueryInterface(aElement);
|
|
if (!browserFrame ||
|
|
!browserFrame->GetReallyIsBrowserOrApp()) {
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::mozDir:
|
|
case CSSPseudoClassType::dir:
|
|
{
|
|
if (aDependence) {
|
|
EventStates states = sPseudoClassStateDependences[
|
|
static_cast<CSSPseudoClassTypeBase>(pseudoClass->mType)];
|
|
if (aNodeMatchContext.mStateMask.HasAtLeastOneOfStates(states)) {
|
|
*aDependence = true;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// If we only had to consider HTML, directionality would be
|
|
// exclusively LTR or RTL.
|
|
//
|
|
// However, in markup languages where there is no direction attribute
|
|
// we have to consider the possibility that neither dir(rtl) nor
|
|
// dir(ltr) matches.
|
|
EventStates state = aElement->StyleState();
|
|
nsDependentString dirString(pseudoClass->u.mString);
|
|
|
|
if (dirString.EqualsLiteral("rtl")) {
|
|
if (!state.HasState(NS_EVENT_STATE_RTL)) {
|
|
return false;
|
|
}
|
|
} else if (dirString.EqualsLiteral("ltr")) {
|
|
if (!state.HasState(NS_EVENT_STATE_LTR)) {
|
|
return false;
|
|
}
|
|
} else {
|
|
// Selectors specifying other directions never match.
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CSSPseudoClassType::scope:
|
|
if (aTreeMatchContext.mForScopedStyle) {
|
|
if (aTreeMatchContext.mCurrentStyleScope) {
|
|
// If mCurrentStyleScope is null, aElement must be the style
|
|
// scope root. This is because the PopStyleScopeForSelectorMatching
|
|
// call in SelectorMatchesTree sets mCurrentStyleScope to null
|
|
// as soon as we visit the style scope element, and we won't
|
|
// progress further up the tree after this call to
|
|
// SelectorMatches. Thus if mCurrentStyleScope is still set,
|
|
// we know the selector does not match.
|
|
return false;
|
|
}
|
|
} else if (aTreeMatchContext.HasSpecifiedScope()) {
|
|
if (!aTreeMatchContext.IsScopeElement(aElement)) {
|
|
return false;
|
|
}
|
|
} else {
|
|
if (aElement != aElement->OwnerDoc()->GetRootElement()) {
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
MOZ_ASSERT(false, "How did that happen?");
|
|
}
|
|
} else {
|
|
if (!StateSelectorMatches(aElement, aSelector, aNodeMatchContext,
|
|
aTreeMatchContext, aSelectorFlags, aDependence,
|
|
statesToCheck)) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
bool result = true;
|
|
if (aSelector->mAttrList) {
|
|
// test for attribute match
|
|
if (!aElement->HasAttrs()) {
|
|
// if no attributes on the content, no match
|
|
return false;
|
|
} else {
|
|
result = true;
|
|
nsAttrSelector* attr = aSelector->mAttrList;
|
|
nsIAtom* matchAttribute;
|
|
|
|
do {
|
|
bool isHTML =
|
|
(aTreeMatchContext.mIsHTMLDocument && aElement->IsHTMLElement());
|
|
matchAttribute = isHTML ? attr->mLowercaseAttr : attr->mCasedAttr;
|
|
if (attr->mNameSpace == kNameSpaceID_Unknown) {
|
|
// Attr selector with a wildcard namespace. We have to examine all
|
|
// the attributes on our content node.... This sort of selector is
|
|
// essentially a boolean OR, over all namespaces, of equivalent attr
|
|
// selectors with those namespaces. So to evaluate whether it
|
|
// matches, evaluate for each namespace (the only namespaces that
|
|
// have a chance at matching, of course, are ones that the element
|
|
// actually has attributes in), short-circuiting if we ever match.
|
|
result = false;
|
|
const nsAttrName* attrName;
|
|
for (uint32_t i = 0; (attrName = aElement->GetAttrNameAt(i)); ++i) {
|
|
if (attrName->LocalName() != matchAttribute) {
|
|
continue;
|
|
}
|
|
if (attr->mFunction == NS_ATTR_FUNC_SET) {
|
|
result = true;
|
|
} else {
|
|
nsAutoString value;
|
|
#ifdef DEBUG
|
|
bool hasAttr =
|
|
#endif
|
|
aElement->GetAttr(attrName->NamespaceID(),
|
|
attrName->LocalName(), value);
|
|
NS_ASSERTION(hasAttr, "GetAttrNameAt lied");
|
|
result = AttrMatchesValue(attr, value, isHTML);
|
|
}
|
|
|
|
// At this point |result| has been set by us
|
|
// explicitly in this loop. If it's false, we may still match
|
|
// -- the content may have another attribute with the same name but
|
|
// in a different namespace. But if it's true, we are done (we
|
|
// can short-circuit the boolean OR described above).
|
|
if (result) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
else if (attr->mFunction == NS_ATTR_FUNC_EQUALS) {
|
|
result =
|
|
aElement->
|
|
AttrValueIs(attr->mNameSpace, matchAttribute, attr->mValue,
|
|
attr->IsValueCaseSensitive(isHTML) ? eCaseMatters
|
|
: eIgnoreCase);
|
|
}
|
|
else if (!aElement->HasAttr(attr->mNameSpace, matchAttribute)) {
|
|
result = false;
|
|
}
|
|
else if (attr->mFunction != NS_ATTR_FUNC_SET) {
|
|
nsAutoString value;
|
|
#ifdef DEBUG
|
|
bool hasAttr =
|
|
#endif
|
|
aElement->GetAttr(attr->mNameSpace, matchAttribute, value);
|
|
NS_ASSERTION(hasAttr, "HasAttr lied");
|
|
result = AttrMatchesValue(attr, value, isHTML);
|
|
}
|
|
|
|
attr = attr->mNext;
|
|
} while (attr && result);
|
|
}
|
|
}
|
|
|
|
// apply SelectorMatches to the negated selectors in the chain
|
|
if (!isNegated) {
|
|
for (nsCSSSelector *negation = aSelector->mNegations;
|
|
result && negation; negation = negation->mNegations) {
|
|
bool dependence = false;
|
|
result = !SelectorMatches(aElement, negation, aNodeMatchContext,
|
|
aTreeMatchContext,
|
|
SelectorMatchesFlags::IS_PSEUDO_CLASS_ARGUMENT,
|
|
&dependence);
|
|
// If the selector does match due to the dependence on
|
|
// aNodeMatchContext.mStateMask, then we want to keep result true
|
|
// so that the final result of SelectorMatches is true. Doing so
|
|
// tells StateEnumFunc that there is a dependence on the state.
|
|
result = result || dependence;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
#undef STATE_CHECK
|
|
|
|
#ifdef DEBUG
|
|
static bool
|
|
HasPseudoClassSelectorArgsWithCombinators(nsCSSSelector* aSelector)
|
|
{
|
|
for (nsPseudoClassList* p = aSelector->mPseudoClassList; p; p = p->mNext) {
|
|
if (nsCSSPseudoClasses::HasSelectorListArg(p->mType)) {
|
|
for (nsCSSSelectorList* l = p->u.mSelectors; l; l = l->mNext) {
|
|
if (l->mSelectors->mNext) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
for (nsCSSSelector* n = aSelector->mNegations; n; n = n->mNegations) {
|
|
if (n->mNext) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
/* static */ bool
|
|
nsCSSRuleProcessor::RestrictedSelectorMatches(
|
|
Element* aElement,
|
|
nsCSSSelector* aSelector,
|
|
TreeMatchContext& aTreeMatchContext)
|
|
{
|
|
MOZ_ASSERT(aSelector->IsRestrictedSelector(),
|
|
"aSelector must not have a pseudo-element");
|
|
|
|
NS_WARNING_ASSERTION(
|
|
!HasPseudoClassSelectorArgsWithCombinators(aSelector),
|
|
"processing eRestyle_SomeDescendants can be slow if pseudo-classes with "
|
|
"selector arguments can now have combinators in them");
|
|
|
|
// We match aSelector as if :visited and :link both match visited and
|
|
// unvisited links.
|
|
|
|
NodeMatchContext nodeContext(EventStates(),
|
|
nsCSSRuleProcessor::IsLink(aElement));
|
|
if (nodeContext.mIsRelevantLink) {
|
|
aTreeMatchContext.SetHaveRelevantLink();
|
|
}
|
|
aTreeMatchContext.ResetForUnvisitedMatching();
|
|
bool matches = SelectorMatches(aElement, aSelector, nodeContext,
|
|
aTreeMatchContext, SelectorMatchesFlags::NONE);
|
|
if (nodeContext.mIsRelevantLink) {
|
|
aTreeMatchContext.ResetForVisitedMatching();
|
|
if (SelectorMatches(aElement, aSelector, nodeContext, aTreeMatchContext,
|
|
SelectorMatchesFlags::NONE)) {
|
|
matches = true;
|
|
}
|
|
}
|
|
return matches;
|
|
}
|
|
|
|
// Right now, there are four operators:
|
|
// ' ', the descendant combinator, is greedy
|
|
// '~', the indirect adjacent sibling combinator, is greedy
|
|
// '+' and '>', the direct adjacent sibling and child combinators, are not
|
|
#define NS_IS_GREEDY_OPERATOR(ch) \
|
|
((ch) == char16_t(' ') || (ch) == char16_t('~'))
|
|
|
|
/**
|
|
* Flags for SelectorMatchesTree.
|
|
*/
|
|
enum SelectorMatchesTreeFlags {
|
|
// Whether we still have not found the closest ancestor link element and
|
|
// thus have to check the current element for it.
|
|
eLookForRelevantLink = 0x1,
|
|
|
|
// Whether SelectorMatchesTree should check for, and return true upon
|
|
// finding, an ancestor element that has an eRestyle_SomeDescendants
|
|
// restyle hint pending.
|
|
eMatchOnConditionalRestyleAncestor = 0x2,
|
|
};
|
|
|
|
static bool
|
|
SelectorMatchesTree(Element* aPrevElement,
|
|
nsCSSSelector* aSelector,
|
|
TreeMatchContext& aTreeMatchContext,
|
|
SelectorMatchesTreeFlags aFlags)
|
|
{
|
|
MOZ_ASSERT(!aSelector || !aSelector->IsPseudoElement());
|
|
nsCSSSelector* selector = aSelector;
|
|
Element* prevElement = aPrevElement;
|
|
while (selector) { // check compound selectors
|
|
NS_ASSERTION(!selector->mNext ||
|
|
selector->mNext->mOperator != char16_t(0),
|
|
"compound selector without combinator");
|
|
|
|
// If after the previous selector match we are now outside the
|
|
// current style scope, we don't need to match any further.
|
|
if (aTreeMatchContext.mForScopedStyle &&
|
|
!aTreeMatchContext.IsWithinStyleScopeForSelectorMatching()) {
|
|
return false;
|
|
}
|
|
|
|
// for adjacent sibling combinators, the content to test against the
|
|
// selector is the previous sibling *element*
|
|
Element* element = nullptr;
|
|
if (char16_t('+') == selector->mOperator ||
|
|
char16_t('~') == selector->mOperator) {
|
|
// The relevant link must be an ancestor of the node being matched.
|
|
aFlags = SelectorMatchesTreeFlags(aFlags & ~eLookForRelevantLink);
|
|
nsIContent* parent = prevElement->GetParent();
|
|
if (parent) {
|
|
if (aTreeMatchContext.mForStyling)
|
|
parent->SetFlags(NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS);
|
|
|
|
element = prevElement->GetPreviousElementSibling();
|
|
}
|
|
}
|
|
// for descendant combinators and child combinators, the element
|
|
// to test against is the parent
|
|
else {
|
|
nsIContent *content = prevElement->GetParent();
|
|
// GetParent could return a document fragment; we only want
|
|
// element parents.
|
|
if (content && content->IsElement()) {
|
|
element = content->AsElement();
|
|
if (aTreeMatchContext.mForScopedStyle) {
|
|
// We are moving up to the parent element; tell the
|
|
// TreeMatchContext, so that in case this element is the
|
|
// style scope element, selector matching stops before we
|
|
// traverse further up the tree.
|
|
aTreeMatchContext.PopStyleScopeForSelectorMatching(element);
|
|
}
|
|
|
|
// Compatibility hack: First try matching this selector as though the
|
|
// <xbl:children> element wasn't in the tree to allow old selectors
|
|
// were written before <xbl:children> participated in CSS selector
|
|
// matching to work.
|
|
if (selector->mOperator == '>' && element->IsActiveChildrenElement()) {
|
|
Element* styleScope = aTreeMatchContext.mCurrentStyleScope;
|
|
if (SelectorMatchesTree(element, selector, aTreeMatchContext,
|
|
aFlags)) {
|
|
// It matched, don't try matching on the <xbl:children> element at
|
|
// all.
|
|
return true;
|
|
}
|
|
// We want to reset mCurrentStyleScope on aTreeMatchContext
|
|
// back to its state before the SelectorMatchesTree call, in
|
|
// case that call happens to traverse past the style scope element
|
|
// and sets it to null.
|
|
aTreeMatchContext.mCurrentStyleScope = styleScope;
|
|
}
|
|
}
|
|
}
|
|
if (!element) {
|
|
return false;
|
|
}
|
|
if ((aFlags & eMatchOnConditionalRestyleAncestor) &&
|
|
element->HasFlag(ELEMENT_IS_CONDITIONAL_RESTYLE_ANCESTOR)) {
|
|
// If we're looking at an element that we already generated an
|
|
// eRestyle_SomeDescendants restyle hint for, then we should pretend
|
|
// that we matched here, because we don't know what the values of
|
|
// attributes on |element| were at the time we generated the
|
|
// eRestyle_SomeDescendants. This causes AttributeEnumFunc and
|
|
// HasStateDependentStyle below to generate a restyle hint for the
|
|
// change we're currently looking at, as we don't know whether the LHS
|
|
// of the selector we looked up matches or not. (We only pass in aFlags
|
|
// to cause us to look for eRestyle_SomeDescendants here under
|
|
// AttributeEnumFunc and HasStateDependentStyle.)
|
|
return true;
|
|
}
|
|
const bool isRelevantLink = (aFlags & eLookForRelevantLink) &&
|
|
nsCSSRuleProcessor::IsLink(element);
|
|
NodeMatchContext nodeContext(EventStates(), isRelevantLink);
|
|
if (isRelevantLink) {
|
|
// If we find an ancestor of the matched node that is a link
|
|
// during the matching process, then it's the relevant link (see
|
|
// constructor call above).
|
|
// Since we are still matching against selectors that contain
|
|
// :visited (they'll just fail), we will always find such a node
|
|
// during the selector matching process if there is a relevant
|
|
// link that can influence selector matching.
|
|
aFlags = SelectorMatchesTreeFlags(aFlags & ~eLookForRelevantLink);
|
|
aTreeMatchContext.SetHaveRelevantLink();
|
|
}
|
|
if (SelectorMatches(element, selector, nodeContext, aTreeMatchContext,
|
|
SelectorMatchesFlags::NONE)) {
|
|
// to avoid greedy matching, we need to recur if this is a
|
|
// descendant or general sibling combinator and the next
|
|
// combinator is different, but we can make an exception for
|
|
// sibling, then parent, since a sibling's parent is always the
|
|
// same.
|
|
if (NS_IS_GREEDY_OPERATOR(selector->mOperator) &&
|
|
selector->mNext &&
|
|
selector->mNext->mOperator != selector->mOperator &&
|
|
!(selector->mOperator == '~' &&
|
|
NS_IS_ANCESTOR_OPERATOR(selector->mNext->mOperator))) {
|
|
|
|
// pretend the selector didn't match, and step through content
|
|
// while testing the same selector
|
|
|
|
// This approach is slightly strange in that when it recurs
|
|
// it tests from the top of the content tree, down. This
|
|
// doesn't matter much for performance since most selectors
|
|
// don't match. (If most did, it might be faster...)
|
|
Element* styleScope = aTreeMatchContext.mCurrentStyleScope;
|
|
if (SelectorMatchesTree(element, selector, aTreeMatchContext, aFlags)) {
|
|
return true;
|
|
}
|
|
// We want to reset mCurrentStyleScope on aTreeMatchContext
|
|
// back to its state before the SelectorMatchesTree call, in
|
|
// case that call happens to traverse past the style scope element
|
|
// and sets it to null.
|
|
aTreeMatchContext.mCurrentStyleScope = styleScope;
|
|
}
|
|
selector = selector->mNext;
|
|
}
|
|
else {
|
|
// for adjacent sibling and child combinators, if we didn't find
|
|
// a match, we're done
|
|
if (!NS_IS_GREEDY_OPERATOR(selector->mOperator)) {
|
|
return false; // parent was required to match
|
|
}
|
|
}
|
|
prevElement = element;
|
|
}
|
|
return true; // all the selectors matched.
|
|
}
|
|
|
|
static inline
|
|
void ContentEnumFunc(const RuleValue& value, nsCSSSelector* aSelector,
|
|
ElementDependentRuleProcessorData* data, NodeMatchContext& nodeContext,
|
|
AncestorFilter *ancestorFilter)
|
|
{
|
|
if (nodeContext.mIsRelevantLink) {
|
|
data->mTreeMatchContext.SetHaveRelevantLink();
|
|
}
|
|
if (ancestorFilter &&
|
|
!ancestorFilter->MightHaveMatchingAncestor<RuleValue::eMaxAncestorHashes>(
|
|
value.mAncestorSelectorHashes)) {
|
|
// We won't match; nothing else to do here
|
|
return;
|
|
}
|
|
if (!data->mTreeMatchContext.SetStyleScopeForSelectorMatching(data->mElement,
|
|
data->mScope)) {
|
|
// The selector is for a rule in a scoped style sheet, and the subject
|
|
// of the selector matching is not in its scope.
|
|
return;
|
|
}
|
|
nsCSSSelector* selector = aSelector;
|
|
if (selector->IsPseudoElement()) {
|
|
PseudoElementRuleProcessorData* pdata =
|
|
static_cast<PseudoElementRuleProcessorData*>(data);
|
|
if (!pdata->mPseudoElement && selector->mPseudoClassList) {
|
|
// We can get here when calling getComputedStyle(aElt, aPseudo) if:
|
|
//
|
|
// * aPseudo is a pseudo-element that supports a user action
|
|
// pseudo-class, like "::placeholder";
|
|
// * there is a style rule that uses a pseudo-class on this
|
|
// pseudo-element in the document, like ::placeholder:hover; and
|
|
// * aElt does not have such a pseudo-element.
|
|
//
|
|
// We know that the selector can't match, since there is no element for
|
|
// the user action pseudo-class to match against.
|
|
return;
|
|
}
|
|
if (!StateSelectorMatches(pdata->mPseudoElement, aSelector, nodeContext,
|
|
data->mTreeMatchContext,
|
|
SelectorMatchesFlags::NONE)) {
|
|
return;
|
|
}
|
|
selector = selector->mNext;
|
|
}
|
|
|
|
SelectorMatchesFlags selectorFlags = SelectorMatchesFlags::NONE;
|
|
if (aSelector->IsPseudoElement()) {
|
|
selectorFlags |= SelectorMatchesFlags::HAS_PSEUDO_ELEMENT;
|
|
}
|
|
if (SelectorMatches(data->mElement, selector, nodeContext,
|
|
data->mTreeMatchContext, selectorFlags)) {
|
|
nsCSSSelector *next = selector->mNext;
|
|
if (!next ||
|
|
SelectorMatchesTree(data->mElement, next,
|
|
data->mTreeMatchContext,
|
|
nodeContext.mIsRelevantLink ?
|
|
SelectorMatchesTreeFlags(0) :
|
|
eLookForRelevantLink)) {
|
|
css::Declaration* declaration = value.mRule->GetDeclaration();
|
|
declaration->SetImmutable();
|
|
data->mRuleWalker->Forward(declaration);
|
|
// nsStyleSet will deal with the !important rule
|
|
}
|
|
}
|
|
}
|
|
|
|
/* virtual */ void
|
|
nsCSSRuleProcessor::RulesMatching(ElementRuleProcessorData *aData)
|
|
{
|
|
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
|
|
|
|
if (cascade) {
|
|
NodeMatchContext nodeContext(EventStates(),
|
|
nsCSSRuleProcessor::IsLink(aData->mElement));
|
|
cascade->mRuleHash.EnumerateAllRules(aData->mElement, aData, nodeContext);
|
|
}
|
|
}
|
|
|
|
/* virtual */ void
|
|
nsCSSRuleProcessor::RulesMatching(PseudoElementRuleProcessorData* aData)
|
|
{
|
|
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
|
|
|
|
if (cascade) {
|
|
RuleHash* ruleHash = cascade->mPseudoElementRuleHashes[
|
|
static_cast<CSSPseudoElementTypeBase>(aData->mPseudoType)];
|
|
if (ruleHash) {
|
|
NodeMatchContext nodeContext(EventStates(),
|
|
nsCSSRuleProcessor::IsLink(aData->mElement));
|
|
ruleHash->EnumerateAllRules(aData->mElement, aData, nodeContext);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* virtual */ void
|
|
nsCSSRuleProcessor::RulesMatching(AnonBoxRuleProcessorData* aData)
|
|
{
|
|
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
|
|
|
|
if (cascade && cascade->mAnonBoxRules.EntryCount()) {
|
|
auto entry = static_cast<RuleHashTagTableEntry*>
|
|
(cascade->mAnonBoxRules.Search(aData->mPseudoTag));
|
|
if (entry) {
|
|
nsTArray<RuleValue>& rules = entry->mRules;
|
|
for (RuleValue *value = rules.Elements(), *end = value + rules.Length();
|
|
value != end; ++value) {
|
|
css::Declaration* declaration = value->mRule->GetDeclaration();
|
|
declaration->SetImmutable();
|
|
aData->mRuleWalker->Forward(declaration);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef MOZ_XUL
|
|
/* virtual */ void
|
|
nsCSSRuleProcessor::RulesMatching(XULTreeRuleProcessorData* aData)
|
|
{
|
|
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
|
|
|
|
if (cascade && cascade->mXULTreeRules.EntryCount()) {
|
|
auto entry = static_cast<RuleHashTagTableEntry*>
|
|
(cascade->mXULTreeRules.Search(aData->mPseudoTag));
|
|
if (entry) {
|
|
NodeMatchContext nodeContext(EventStates(),
|
|
nsCSSRuleProcessor::IsLink(aData->mElement));
|
|
nsTArray<RuleValue>& rules = entry->mRules;
|
|
for (RuleValue *value = rules.Elements(), *end = value + rules.Length();
|
|
value != end; ++value) {
|
|
if (aData->mComparator->PseudoMatches(value->mSelector)) {
|
|
ContentEnumFunc(*value, value->mSelector->mNext, aData, nodeContext,
|
|
nullptr);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static inline nsRestyleHint RestyleHintForOp(char16_t oper)
|
|
{
|
|
if (oper == char16_t('+') || oper == char16_t('~')) {
|
|
return eRestyle_LaterSiblings;
|
|
}
|
|
|
|
if (oper != char16_t(0)) {
|
|
return eRestyle_Subtree;
|
|
}
|
|
|
|
return eRestyle_Self;
|
|
}
|
|
|
|
nsRestyleHint
|
|
nsCSSRuleProcessor::HasStateDependentStyle(ElementDependentRuleProcessorData* aData,
|
|
Element* aStatefulElement,
|
|
CSSPseudoElementType aPseudoType,
|
|
EventStates aStateMask)
|
|
{
|
|
MOZ_ASSERT(!aData->mTreeMatchContext.mForScopedStyle,
|
|
"mCurrentStyleScope will need to be saved and restored after the "
|
|
"SelectorMatchesTree call");
|
|
|
|
bool isPseudoElement =
|
|
aPseudoType != CSSPseudoElementType::NotPseudo;
|
|
|
|
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
|
|
|
|
// Look up the content node in the state rule list, which points to
|
|
// any (CSS2 definition) simple selector (whether or not it is the
|
|
// subject) that has a state pseudo-class on it. This means that this
|
|
// code will be matching selectors that aren't real selectors in any
|
|
// stylesheet (e.g., if there is a selector "body > p:hover > a", then
|
|
// "body > p:hover" will be in |cascade->mStateSelectors|). Note that
|
|
// |ComputeSelectorStateDependence| below determines which selectors are in
|
|
// |cascade->mStateSelectors|.
|
|
nsRestyleHint hint = nsRestyleHint(0);
|
|
if (cascade) {
|
|
StateSelector *iter = cascade->mStateSelectors.Elements(),
|
|
*end = iter + cascade->mStateSelectors.Length();
|
|
NodeMatchContext nodeContext(aStateMask, false);
|
|
for(; iter != end; ++iter) {
|
|
nsCSSSelector* selector = iter->mSelector;
|
|
EventStates states = iter->mStates;
|
|
|
|
if (selector->IsPseudoElement() != isPseudoElement) {
|
|
continue;
|
|
}
|
|
|
|
nsCSSSelector* selectorForPseudo;
|
|
if (isPseudoElement) {
|
|
if (selector->PseudoType() != aPseudoType) {
|
|
continue;
|
|
}
|
|
selectorForPseudo = selector;
|
|
selector = selector->mNext;
|
|
}
|
|
|
|
nsRestyleHint possibleChange = RestyleHintForOp(selector->mOperator);
|
|
SelectorMatchesFlags selectorFlags = SelectorMatchesFlags::UNKNOWN;
|
|
|
|
// If hint already includes all the bits of possibleChange,
|
|
// don't bother calling SelectorMatches, since even if it returns false
|
|
// hint won't change.
|
|
// Also don't bother calling SelectorMatches if none of the
|
|
// states passed in are relevant here.
|
|
if ((possibleChange & ~hint) &&
|
|
states.HasAtLeastOneOfStates(aStateMask) &&
|
|
// We can optimize away testing selectors that only involve :hover, a
|
|
// namespace, and a tag name against nodes that don't have the
|
|
// NodeHasRelevantHoverRules flag: such a selector didn't match
|
|
// the tag name or namespace the first time around (since the :hover
|
|
// didn't set the NodeHasRelevantHoverRules flag), so it won't
|
|
// match it now. Check for our selector only having :hover states, or
|
|
// the element having the hover rules flag, or the selector having
|
|
// some sort of non-namespace, non-tagname data in it.
|
|
(states != NS_EVENT_STATE_HOVER ||
|
|
aStatefulElement->HasRelevantHoverRules() ||
|
|
selector->mIDList || selector->mClassList ||
|
|
// We generally expect an mPseudoClassList, since we have a :hover.
|
|
// The question is whether we have anything else in there.
|
|
(selector->mPseudoClassList &&
|
|
(selector->mPseudoClassList->mNext ||
|
|
selector->mPseudoClassList->mType !=
|
|
CSSPseudoClassType::hover)) ||
|
|
selector->mAttrList || selector->mNegations) &&
|
|
(!isPseudoElement ||
|
|
StateSelectorMatches(aStatefulElement, selectorForPseudo,
|
|
nodeContext, aData->mTreeMatchContext,
|
|
selectorFlags, nullptr, aStateMask)) &&
|
|
SelectorMatches(aData->mElement, selector, nodeContext,
|
|
aData->mTreeMatchContext, selectorFlags) &&
|
|
SelectorMatchesTree(aData->mElement, selector->mNext,
|
|
aData->mTreeMatchContext,
|
|
eMatchOnConditionalRestyleAncestor))
|
|
{
|
|
hint = nsRestyleHint(hint | possibleChange);
|
|
}
|
|
}
|
|
}
|
|
return hint;
|
|
}
|
|
|
|
nsRestyleHint
|
|
nsCSSRuleProcessor::HasStateDependentStyle(StateRuleProcessorData* aData)
|
|
{
|
|
return HasStateDependentStyle(aData,
|
|
aData->mElement,
|
|
CSSPseudoElementType::NotPseudo,
|
|
aData->mStateMask);
|
|
}
|
|
|
|
nsRestyleHint
|
|
nsCSSRuleProcessor::HasStateDependentStyle(PseudoElementStateRuleProcessorData* aData)
|
|
{
|
|
return HasStateDependentStyle(aData,
|
|
aData->mPseudoElement,
|
|
aData->mPseudoType,
|
|
aData->mStateMask);
|
|
}
|
|
|
|
bool
|
|
nsCSSRuleProcessor::HasDocumentStateDependentStyle(StateRuleProcessorData* aData)
|
|
{
|
|
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
|
|
|
|
return cascade && cascade->mSelectorDocumentStates.HasAtLeastOneOfStates(aData->mStateMask);
|
|
}
|
|
|
|
struct AttributeEnumData {
|
|
AttributeEnumData(AttributeRuleProcessorData *aData,
|
|
RestyleHintData& aRestyleHintData)
|
|
: data(aData), change(nsRestyleHint(0)), hintData(aRestyleHintData) {}
|
|
|
|
AttributeRuleProcessorData *data;
|
|
nsRestyleHint change;
|
|
RestyleHintData& hintData;
|
|
};
|
|
|
|
|
|
static inline nsRestyleHint
|
|
RestyleHintForSelectorWithAttributeChange(nsRestyleHint aCurrentHint,
|
|
nsCSSSelector* aSelector,
|
|
nsCSSSelector* aRightmostSelector)
|
|
{
|
|
MOZ_ASSERT(aSelector);
|
|
|
|
char16_t oper = aSelector->mOperator;
|
|
|
|
if (oper == char16_t('+') || oper == char16_t('~')) {
|
|
return eRestyle_LaterSiblings;
|
|
}
|
|
|
|
if (oper == char16_t(':')) {
|
|
return eRestyle_Subtree;
|
|
}
|
|
|
|
if (oper != char16_t(0)) {
|
|
// Check whether the selector is in a form that supports
|
|
// eRestyle_SomeDescendants. If it isn't, return eRestyle_Subtree.
|
|
|
|
if (aCurrentHint & eRestyle_Subtree) {
|
|
// No point checking, since we'll end up restyling the whole
|
|
// subtree anyway.
|
|
return eRestyle_Subtree;
|
|
}
|
|
|
|
if (!aRightmostSelector) {
|
|
// aSelector wasn't a top-level selector, which means we were inside
|
|
// a :not() or :-moz-any(). We don't support that.
|
|
return eRestyle_Subtree;
|
|
}
|
|
|
|
MOZ_ASSERT(aSelector != aRightmostSelector,
|
|
"if aSelector == aRightmostSelector then we should have "
|
|
"no operator");
|
|
|
|
// Check that aRightmostSelector can be passed to RestrictedSelectorMatches.
|
|
if (!aRightmostSelector->IsRestrictedSelector()) {
|
|
return eRestyle_Subtree;
|
|
}
|
|
|
|
// We also don't support pseudo-elements on any of the selectors
|
|
// between aRightmostSelector and aSelector.
|
|
// XXX Can we lift this restriction, so that we don't have to loop
|
|
// over all the selectors?
|
|
for (nsCSSSelector* sel = aRightmostSelector->mNext;
|
|
sel != aSelector;
|
|
sel = sel->mNext) {
|
|
MOZ_ASSERT(sel, "aSelector must be reachable from aRightmostSelector");
|
|
if (sel->PseudoType() != CSSPseudoElementType::NotPseudo) {
|
|
return eRestyle_Subtree;
|
|
}
|
|
}
|
|
|
|
return eRestyle_SomeDescendants;
|
|
}
|
|
|
|
return eRestyle_Self;
|
|
}
|
|
|
|
static void
|
|
AttributeEnumFunc(nsCSSSelector* aSelector,
|
|
nsCSSSelector* aRightmostSelector,
|
|
AttributeEnumData* aData)
|
|
{
|
|
AttributeRuleProcessorData *data = aData->data;
|
|
|
|
if (!data->mTreeMatchContext.SetStyleScopeForSelectorMatching(data->mElement,
|
|
data->mScope)) {
|
|
// The selector is for a rule in a scoped style sheet, and the subject
|
|
// of the selector matching is not in its scope.
|
|
return;
|
|
}
|
|
|
|
nsRestyleHint possibleChange =
|
|
RestyleHintForSelectorWithAttributeChange(aData->change,
|
|
aSelector, aRightmostSelector);
|
|
|
|
// If, ignoring eRestyle_SomeDescendants, enumData->change already includes
|
|
// all the bits of possibleChange, don't bother calling SelectorMatches, since
|
|
// even if it returns false enumData->change won't change. If possibleChange
|
|
// has eRestyle_SomeDescendants, we need to call SelectorMatches(Tree)
|
|
// regardless as it might give us new selectors to append to
|
|
// mSelectorsForDescendants.
|
|
NodeMatchContext nodeContext(EventStates(), false);
|
|
if (((possibleChange & (~(aData->change) | eRestyle_SomeDescendants))) &&
|
|
SelectorMatches(data->mElement, aSelector, nodeContext,
|
|
data->mTreeMatchContext, SelectorMatchesFlags::UNKNOWN) &&
|
|
SelectorMatchesTree(data->mElement, aSelector->mNext,
|
|
data->mTreeMatchContext,
|
|
eMatchOnConditionalRestyleAncestor)) {
|
|
aData->change = nsRestyleHint(aData->change | possibleChange);
|
|
if (possibleChange & eRestyle_SomeDescendants) {
|
|
aData->hintData.mSelectorsForDescendants.AppendElement(aRightmostSelector);
|
|
}
|
|
}
|
|
}
|
|
|
|
static MOZ_ALWAYS_INLINE void
|
|
EnumerateSelectors(nsTArray<SelectorPair>& aSelectors, AttributeEnumData* aData)
|
|
{
|
|
SelectorPair *iter = aSelectors.Elements(),
|
|
*end = iter + aSelectors.Length();
|
|
for (; iter != end; ++iter) {
|
|
AttributeEnumFunc(iter->mSelector, iter->mRightmostSelector, aData);
|
|
}
|
|
}
|
|
|
|
static MOZ_ALWAYS_INLINE void
|
|
EnumerateSelectors(nsTArray<nsCSSSelector*>& aSelectors, AttributeEnumData* aData)
|
|
{
|
|
nsCSSSelector **iter = aSelectors.Elements(),
|
|
**end = iter + aSelectors.Length();
|
|
for (; iter != end; ++iter) {
|
|
AttributeEnumFunc(*iter, nullptr, aData);
|
|
}
|
|
}
|
|
|
|
nsRestyleHint
|
|
nsCSSRuleProcessor::HasAttributeDependentStyle(
|
|
AttributeRuleProcessorData* aData,
|
|
RestyleHintData& aRestyleHintDataResult)
|
|
{
|
|
// We could try making use of aData->mModType, but :not rules make it a bit
|
|
// of a pain to do so... So just ignore it for now.
|
|
|
|
AttributeEnumData data(aData, aRestyleHintDataResult);
|
|
|
|
// Don't do our special handling of certain attributes if the attr
|
|
// hasn't changed yet.
|
|
if (aData->mAttrHasChanged) {
|
|
// check for the lwtheme and lwthemetextcolor attribute on root XUL elements
|
|
if ((aData->mAttribute == nsGkAtoms::lwtheme ||
|
|
aData->mAttribute == nsGkAtoms::lwthemetextcolor) &&
|
|
aData->mElement->GetNameSpaceID() == kNameSpaceID_XUL &&
|
|
aData->mElement == aData->mElement->OwnerDoc()->GetRootElement())
|
|
{
|
|
data.change = nsRestyleHint(data.change | eRestyle_Subtree);
|
|
}
|
|
|
|
// We don't know the namespace of the attribute, and xml:lang applies to
|
|
// all elements. If the lang attribute changes, we need to restyle our
|
|
// whole subtree, since the :lang selector on our descendants can examine
|
|
// our lang attribute.
|
|
if (aData->mAttribute == nsGkAtoms::lang) {
|
|
data.change = nsRestyleHint(data.change | eRestyle_Subtree);
|
|
}
|
|
}
|
|
|
|
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
|
|
|
|
// Since we get both before and after notifications for attributes, we
|
|
// don't have to ignore aData->mAttribute while matching. Just check
|
|
// whether we have selectors relevant to aData->mAttribute that we
|
|
// match. If this is the before change notification, that will catch
|
|
// rules we might stop matching; if the after change notification, the
|
|
// ones we might have started matching.
|
|
if (cascade) {
|
|
if (aData->mAttribute == nsGkAtoms::id) {
|
|
nsIAtom* id = aData->mElement->GetID();
|
|
if (id) {
|
|
auto entry =
|
|
static_cast<AtomSelectorEntry*>(cascade->mIdSelectors.Search(id));
|
|
if (entry) {
|
|
EnumerateSelectors(entry->mSelectors, &data);
|
|
}
|
|
}
|
|
|
|
EnumerateSelectors(cascade->mPossiblyNegatedIDSelectors, &data);
|
|
}
|
|
|
|
if (aData->mAttribute == nsGkAtoms::_class &&
|
|
aData->mNameSpaceID == kNameSpaceID_None) {
|
|
const nsAttrValue* otherClasses = aData->mOtherValue;
|
|
NS_ASSERTION(otherClasses ||
|
|
aData->mModType == nsIDOMMutationEvent::REMOVAL,
|
|
"All class values should be StoresOwnData and parsed"
|
|
"via Element::BeforeSetAttr, so available here");
|
|
// For WillChange, enumerate classes that will be removed to see which
|
|
// rules apply before the change.
|
|
// For Changed, enumerate classes that have been added to see which rules
|
|
// apply after the change.
|
|
// In both cases we're interested in the classes that are currently on
|
|
// the element but not in mOtherValue.
|
|
const nsAttrValue* elementClasses = aData->mElement->GetClasses();
|
|
if (elementClasses) {
|
|
int32_t atomCount = elementClasses->GetAtomCount();
|
|
if (atomCount > 0) {
|
|
nsTHashtable<nsPtrHashKey<nsIAtom>> otherClassesTable;
|
|
if (otherClasses) {
|
|
int32_t otherClassesCount = otherClasses->GetAtomCount();
|
|
for (int32_t i = 0; i < otherClassesCount; ++i) {
|
|
otherClassesTable.PutEntry(otherClasses->AtomAt(i));
|
|
}
|
|
}
|
|
for (int32_t i = 0; i < atomCount; ++i) {
|
|
nsIAtom* curClass = elementClasses->AtomAt(i);
|
|
if (!otherClassesTable.Contains(curClass)) {
|
|
auto entry =
|
|
static_cast<AtomSelectorEntry*>
|
|
(cascade->mClassSelectors.Search(curClass));
|
|
if (entry) {
|
|
EnumerateSelectors(entry->mSelectors, &data);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
EnumerateSelectors(cascade->mPossiblyNegatedClassSelectors, &data);
|
|
}
|
|
|
|
auto entry =
|
|
static_cast<AtomSelectorEntry*>
|
|
(cascade->mAttributeSelectors.Search(aData->mAttribute));
|
|
if (entry) {
|
|
EnumerateSelectors(entry->mSelectors, &data);
|
|
}
|
|
}
|
|
|
|
return data.change;
|
|
}
|
|
|
|
/* virtual */ bool
|
|
nsCSSRuleProcessor::MediumFeaturesChanged(nsPresContext* aPresContext)
|
|
{
|
|
// We don't want to do anything if there aren't any sets of rules
|
|
// cached yet, since we should not build the rule cascade too early
|
|
// (e.g., before we know whether the quirk style sheet should be
|
|
// enabled). And if there's nothing cached, it doesn't matter if
|
|
// anything changed. But in the cases where it does matter, we've
|
|
// cached a previous cache key to test against, instead of our current
|
|
// rule cascades. See bug 448281 and bug 1089417.
|
|
MOZ_ASSERT(!(mRuleCascades && mPreviousCacheKey));
|
|
RuleCascadeData *old = mRuleCascades;
|
|
if (old) {
|
|
RefreshRuleCascade(aPresContext);
|
|
return (old != mRuleCascades);
|
|
}
|
|
|
|
if (mPreviousCacheKey) {
|
|
// RefreshRuleCascade will get rid of mPreviousCacheKey anyway to
|
|
// maintain the invariant that we can't have both an mRuleCascades
|
|
// and an mPreviousCacheKey. But we need to hold it a little
|
|
// longer.
|
|
UniquePtr<nsMediaQueryResultCacheKey> previousCacheKey(
|
|
Move(mPreviousCacheKey));
|
|
RefreshRuleCascade(aPresContext);
|
|
|
|
// This test is a bit pessimistic since the cache key's operator==
|
|
// just does list comparison rather than set comparison, but it
|
|
// should catch all the cases we care about (i.e., where the cascade
|
|
// order hasn't changed). Other cases will do a restyle anyway, so
|
|
// we shouldn't need to worry about posting a second.
|
|
return !mRuleCascades || // all sheets gone, but we had sheets before
|
|
mRuleCascades->mCacheKey != *previousCacheKey;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
UniquePtr<nsMediaQueryResultCacheKey>
|
|
nsCSSRuleProcessor::CloneMQCacheKey()
|
|
{
|
|
MOZ_ASSERT(!(mRuleCascades && mPreviousCacheKey));
|
|
|
|
RuleCascadeData* c = mRuleCascades;
|
|
if (!c) {
|
|
// We might have an mPreviousCacheKey. It already comes from a call
|
|
// to CloneMQCacheKey, so don't bother checking
|
|
// HasFeatureConditions().
|
|
if (mPreviousCacheKey) {
|
|
NS_ASSERTION(mPreviousCacheKey->HasFeatureConditions(),
|
|
"we shouldn't have a previous cache key unless it has "
|
|
"feature conditions");
|
|
return MakeUnique<nsMediaQueryResultCacheKey>(*mPreviousCacheKey);
|
|
}
|
|
|
|
return UniquePtr<nsMediaQueryResultCacheKey>();
|
|
}
|
|
|
|
if (!c->mCacheKey.HasFeatureConditions()) {
|
|
return UniquePtr<nsMediaQueryResultCacheKey>();
|
|
}
|
|
|
|
return MakeUnique<nsMediaQueryResultCacheKey>(c->mCacheKey);
|
|
}
|
|
|
|
/* virtual */ size_t
|
|
nsCSSRuleProcessor::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
|
|
{
|
|
size_t n = 0;
|
|
n += mSheets.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
for (RuleCascadeData* cascade = mRuleCascades; cascade;
|
|
cascade = cascade->mNext) {
|
|
n += cascade->SizeOfIncludingThis(aMallocSizeOf);
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
/* virtual */ size_t
|
|
nsCSSRuleProcessor::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
|
|
{
|
|
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
|
|
}
|
|
|
|
// Append all the currently-active font face rules to aArray. Return
|
|
// true for success and false for failure.
|
|
bool
|
|
nsCSSRuleProcessor::AppendFontFaceRules(
|
|
nsPresContext *aPresContext,
|
|
nsTArray<nsFontFaceRuleContainer>& aArray)
|
|
{
|
|
RuleCascadeData* cascade = GetRuleCascade(aPresContext);
|
|
|
|
if (cascade) {
|
|
if (!aArray.AppendElements(cascade->mFontFaceRules))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
nsCSSKeyframesRule*
|
|
nsCSSRuleProcessor::KeyframesRuleForName(nsPresContext* aPresContext,
|
|
const nsString& aName)
|
|
{
|
|
RuleCascadeData* cascade = GetRuleCascade(aPresContext);
|
|
|
|
if (cascade) {
|
|
return cascade->mKeyframesRuleTable.Get(aName);
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
nsCSSCounterStyleRule*
|
|
nsCSSRuleProcessor::CounterStyleRuleForName(nsPresContext* aPresContext,
|
|
const nsAString& aName)
|
|
{
|
|
RuleCascadeData* cascade = GetRuleCascade(aPresContext);
|
|
|
|
if (cascade) {
|
|
return cascade->mCounterStyleRuleTable.Get(aName);
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
// Append all the currently-active page rules to aArray. Return
|
|
// true for success and false for failure.
|
|
bool
|
|
nsCSSRuleProcessor::AppendPageRules(
|
|
nsPresContext* aPresContext,
|
|
nsTArray<nsCSSPageRule*>& aArray)
|
|
{
|
|
RuleCascadeData* cascade = GetRuleCascade(aPresContext);
|
|
|
|
if (cascade) {
|
|
if (!aArray.AppendElements(cascade->mPageRules)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
nsCSSRuleProcessor::AppendFontFeatureValuesRules(
|
|
nsPresContext *aPresContext,
|
|
nsTArray<nsCSSFontFeatureValuesRule*>& aArray)
|
|
{
|
|
RuleCascadeData* cascade = GetRuleCascade(aPresContext);
|
|
|
|
if (cascade) {
|
|
if (!aArray.AppendElements(cascade->mFontFeatureValuesRules))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
nsresult
|
|
nsCSSRuleProcessor::ClearRuleCascades()
|
|
{
|
|
if (!mPreviousCacheKey) {
|
|
mPreviousCacheKey = CloneMQCacheKey();
|
|
}
|
|
|
|
// No need to remove the rule processor from the RuleProcessorCache here,
|
|
// since CSSStyleSheet::ClearRuleCascades will have called
|
|
// RuleProcessorCache::RemoveSheet() passing itself, which will catch
|
|
// this rule processor (and any others for different @-moz-document
|
|
// cache key results).
|
|
MOZ_ASSERT(!RuleProcessorCache::HasRuleProcessor(this));
|
|
|
|
#ifdef DEBUG
|
|
// For shared rule processors, if we've already gathered document
|
|
// rules, then they will now be out of date. We don't actually need
|
|
// them to be up-to-date (see the comment in RefreshRuleCascade), so
|
|
// record their invalidity so we can assert if we try to use them.
|
|
if (!mMustGatherDocumentRules) {
|
|
mDocumentRulesAndCacheKeyValid = false;
|
|
}
|
|
#endif
|
|
|
|
// We rely on our caller (perhaps indirectly) to do something that
|
|
// will rebuild style data and the user font set (either
|
|
// nsIPresShell::RestyleForCSSRuleChanges or
|
|
// nsPresContext::RebuildAllStyleData).
|
|
RuleCascadeData *data = mRuleCascades;
|
|
mRuleCascades = nullptr;
|
|
while (data) {
|
|
RuleCascadeData *next = data->mNext;
|
|
delete data;
|
|
data = next;
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
// This function should return the set of states that this selector
|
|
// depends on; this is used to implement HasStateDependentStyle. It
|
|
// does NOT recur down into things like :not and :-moz-any.
|
|
inline
|
|
EventStates ComputeSelectorStateDependence(nsCSSSelector& aSelector)
|
|
{
|
|
EventStates states;
|
|
for (nsPseudoClassList* pseudoClass = aSelector.mPseudoClassList;
|
|
pseudoClass; pseudoClass = pseudoClass->mNext) {
|
|
// Tree pseudo-elements overload mPseudoClassList for things that
|
|
// aren't pseudo-classes.
|
|
if (pseudoClass->mType >= CSSPseudoClassType::Count) {
|
|
continue;
|
|
}
|
|
|
|
auto idx = static_cast<CSSPseudoClassTypeBase>(pseudoClass->mType);
|
|
states |= sPseudoClassStateDependences[idx];
|
|
}
|
|
return states;
|
|
}
|
|
|
|
static bool
|
|
AddSelector(RuleCascadeData* aCascade,
|
|
// The part between combinators at the top level of the selector
|
|
nsCSSSelector* aSelectorInTopLevel,
|
|
// The part we should look through (might be in :not or :-moz-any())
|
|
nsCSSSelector* aSelectorPart,
|
|
// The right-most selector at the top level
|
|
nsCSSSelector* aRightmostSelector)
|
|
{
|
|
// It's worth noting that this loop over negations isn't quite
|
|
// optimal for two reasons. One, we could add something to one of
|
|
// these lists twice, which means we'll check it twice, but I don't
|
|
// think that's worth worrying about. (We do the same for multiple
|
|
// attribute selectors on the same attribute.) Two, we don't really
|
|
// need to check negations past the first in the current
|
|
// implementation (and they're rare as well), but that might change
|
|
// in the future if :not() is extended.
|
|
for (nsCSSSelector* negation = aSelectorPart; negation;
|
|
negation = negation->mNegations) {
|
|
// Track both document states and attribute dependence in pseudo-classes.
|
|
for (nsPseudoClassList* pseudoClass = negation->mPseudoClassList;
|
|
pseudoClass; pseudoClass = pseudoClass->mNext) {
|
|
switch (pseudoClass->mType) {
|
|
case CSSPseudoClassType::mozLocaleDir: {
|
|
aCascade->mSelectorDocumentStates |= NS_DOCUMENT_STATE_RTL_LOCALE;
|
|
break;
|
|
}
|
|
case CSSPseudoClassType::mozWindowInactive: {
|
|
aCascade->mSelectorDocumentStates |= NS_DOCUMENT_STATE_WINDOW_INACTIVE;
|
|
break;
|
|
}
|
|
case CSSPseudoClassType::mozTableBorderNonzero: {
|
|
nsTArray<SelectorPair> *array =
|
|
aCascade->AttributeListFor(nsGkAtoms::border);
|
|
if (!array) {
|
|
return false;
|
|
}
|
|
array->AppendElement(SelectorPair(aSelectorInTopLevel,
|
|
aRightmostSelector));
|
|
break;
|
|
}
|
|
default: {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Build mStateSelectors.
|
|
EventStates dependentStates = ComputeSelectorStateDependence(*negation);
|
|
if (!dependentStates.IsEmpty()) {
|
|
aCascade->mStateSelectors.AppendElement(
|
|
nsCSSRuleProcessor::StateSelector(dependentStates,
|
|
aSelectorInTopLevel));
|
|
}
|
|
|
|
// Build mIDSelectors
|
|
if (negation == aSelectorInTopLevel) {
|
|
for (nsAtomList* curID = negation->mIDList; curID;
|
|
curID = curID->mNext) {
|
|
auto entry = static_cast<AtomSelectorEntry*>
|
|
(aCascade->mIdSelectors.Add(curID->mAtom, fallible));
|
|
if (entry) {
|
|
entry->mSelectors.AppendElement(SelectorPair(aSelectorInTopLevel,
|
|
aRightmostSelector));
|
|
}
|
|
}
|
|
} else if (negation->mIDList) {
|
|
aCascade->mPossiblyNegatedIDSelectors.AppendElement(aSelectorInTopLevel);
|
|
}
|
|
|
|
// Build mClassSelectors
|
|
if (negation == aSelectorInTopLevel) {
|
|
for (nsAtomList* curClass = negation->mClassList; curClass;
|
|
curClass = curClass->mNext) {
|
|
auto entry = static_cast<AtomSelectorEntry*>
|
|
(aCascade->mClassSelectors.Add(curClass->mAtom, fallible));
|
|
if (entry) {
|
|
entry->mSelectors.AppendElement(SelectorPair(aSelectorInTopLevel,
|
|
aRightmostSelector));
|
|
}
|
|
}
|
|
} else if (negation->mClassList) {
|
|
aCascade->mPossiblyNegatedClassSelectors.AppendElement(aSelectorInTopLevel);
|
|
}
|
|
|
|
// Build mAttributeSelectors.
|
|
for (nsAttrSelector *attr = negation->mAttrList; attr;
|
|
attr = attr->mNext) {
|
|
nsTArray<SelectorPair> *array =
|
|
aCascade->AttributeListFor(attr->mCasedAttr);
|
|
if (!array) {
|
|
return false;
|
|
}
|
|
array->AppendElement(SelectorPair(aSelectorInTopLevel,
|
|
aRightmostSelector));
|
|
if (attr->mLowercaseAttr != attr->mCasedAttr) {
|
|
array = aCascade->AttributeListFor(attr->mLowercaseAttr);
|
|
if (!array) {
|
|
return false;
|
|
}
|
|
array->AppendElement(SelectorPair(aSelectorInTopLevel,
|
|
aRightmostSelector));
|
|
}
|
|
}
|
|
|
|
// Recur through any :-moz-any selectors
|
|
for (nsPseudoClassList* pseudoClass = negation->mPseudoClassList;
|
|
pseudoClass; pseudoClass = pseudoClass->mNext) {
|
|
if (pseudoClass->mType == CSSPseudoClassType::any) {
|
|
for (nsCSSSelectorList *l = pseudoClass->u.mSelectors; l; l = l->mNext) {
|
|
nsCSSSelector *s = l->mSelectors;
|
|
if (!AddSelector(aCascade, aSelectorInTopLevel, s,
|
|
aRightmostSelector)) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
AddRule(RuleSelectorPair* aRuleInfo, RuleCascadeData* aCascade)
|
|
{
|
|
RuleCascadeData * const cascade = aCascade;
|
|
|
|
// Build the rule hash.
|
|
CSSPseudoElementType pseudoType = aRuleInfo->mSelector->PseudoType();
|
|
if (MOZ_LIKELY(pseudoType == CSSPseudoElementType::NotPseudo)) {
|
|
cascade->mRuleHash.AppendRule(*aRuleInfo);
|
|
} else if (pseudoType < CSSPseudoElementType::Count) {
|
|
RuleHash*& ruleHash = cascade->mPseudoElementRuleHashes[
|
|
static_cast<CSSPseudoElementTypeBase>(pseudoType)];
|
|
if (!ruleHash) {
|
|
ruleHash = new RuleHash(cascade->mQuirksMode);
|
|
if (!ruleHash) {
|
|
// Out of memory; give up
|
|
return false;
|
|
}
|
|
}
|
|
NS_ASSERTION(aRuleInfo->mSelector->mNext,
|
|
"Must have mNext; parser screwed up");
|
|
NS_ASSERTION(aRuleInfo->mSelector->mNext->mOperator == ':',
|
|
"Unexpected mNext combinator");
|
|
ruleHash->AppendRule(*aRuleInfo);
|
|
} else if (pseudoType == CSSPseudoElementType::AnonBox) {
|
|
NS_ASSERTION(!aRuleInfo->mSelector->mCasedTag &&
|
|
!aRuleInfo->mSelector->mIDList &&
|
|
!aRuleInfo->mSelector->mClassList &&
|
|
!aRuleInfo->mSelector->mPseudoClassList &&
|
|
!aRuleInfo->mSelector->mAttrList &&
|
|
!aRuleInfo->mSelector->mNegations &&
|
|
!aRuleInfo->mSelector->mNext &&
|
|
aRuleInfo->mSelector->mNameSpace == kNameSpaceID_Unknown,
|
|
"Parser messed up with anon box selector");
|
|
|
|
// Index doesn't matter here, since we'll just be walking these
|
|
// rules in order; just pass 0.
|
|
AppendRuleToTagTable(&cascade->mAnonBoxRules,
|
|
aRuleInfo->mSelector->mLowercaseTag,
|
|
RuleValue(*aRuleInfo, 0, aCascade->mQuirksMode));
|
|
} else {
|
|
#ifdef MOZ_XUL
|
|
NS_ASSERTION(pseudoType == CSSPseudoElementType::XULTree,
|
|
"Unexpected pseudo type");
|
|
// Index doesn't matter here, since we'll just be walking these
|
|
// rules in order; just pass 0.
|
|
AppendRuleToTagTable(&cascade->mXULTreeRules,
|
|
aRuleInfo->mSelector->mLowercaseTag,
|
|
RuleValue(*aRuleInfo, 0, aCascade->mQuirksMode));
|
|
#else
|
|
NS_NOTREACHED("Unexpected pseudo type");
|
|
#endif
|
|
}
|
|
|
|
for (nsCSSSelector* selector = aRuleInfo->mSelector;
|
|
selector; selector = selector->mNext) {
|
|
if (selector->IsPseudoElement()) {
|
|
CSSPseudoElementType pseudo = selector->PseudoType();
|
|
if (pseudo >= CSSPseudoElementType::Count ||
|
|
!nsCSSPseudoElements::PseudoElementSupportsUserActionState(pseudo)) {
|
|
NS_ASSERTION(!selector->mNegations, "Shouldn't have negations");
|
|
// We do store selectors ending with pseudo-elements that allow :hover
|
|
// and :active after them in the hashtables corresponding to that
|
|
// selector's mNext (i.e. the thing that matches against the element),
|
|
// but we want to make sure that selectors for any other kinds of
|
|
// pseudo-elements don't end up in the hashtables. In particular, tree
|
|
// pseudos store strange things in mPseudoClassList that we don't want
|
|
// to try to match elements against.
|
|
continue;
|
|
}
|
|
}
|
|
if (!AddSelector(cascade, selector, selector, aRuleInfo->mSelector)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
struct PerWeightDataListItem : public RuleSelectorPair {
|
|
PerWeightDataListItem(css::StyleRule* aRule, nsCSSSelector* aSelector)
|
|
: RuleSelectorPair(aRule, aSelector)
|
|
, mNext(nullptr)
|
|
{}
|
|
// No destructor; these are arena-allocated
|
|
|
|
|
|
// Placement new to arena allocate the PerWeightDataListItem
|
|
void *operator new(size_t aSize, PLArenaPool &aArena) CPP_THROW_NEW {
|
|
void *mem;
|
|
PL_ARENA_ALLOCATE(mem, &aArena, aSize);
|
|
return mem;
|
|
}
|
|
|
|
PerWeightDataListItem *mNext;
|
|
};
|
|
|
|
struct PerWeightData {
|
|
PerWeightData()
|
|
: mRuleSelectorPairs(nullptr)
|
|
, mTail(&mRuleSelectorPairs)
|
|
{}
|
|
|
|
int32_t mWeight;
|
|
PerWeightDataListItem *mRuleSelectorPairs;
|
|
PerWeightDataListItem **mTail;
|
|
};
|
|
|
|
struct RuleByWeightEntry : public PLDHashEntryHdr {
|
|
PerWeightData data; // mWeight is key, mRuleSelectorPairs are value
|
|
};
|
|
|
|
static PLDHashNumber
|
|
HashIntKey(const void *key)
|
|
{
|
|
return PLDHashNumber(NS_PTR_TO_INT32(key));
|
|
}
|
|
|
|
static bool
|
|
MatchWeightEntry(const PLDHashEntryHdr *hdr, const void *key)
|
|
{
|
|
const RuleByWeightEntry *entry = (const RuleByWeightEntry *)hdr;
|
|
return entry->data.mWeight == NS_PTR_TO_INT32(key);
|
|
}
|
|
|
|
static void
|
|
InitWeightEntry(PLDHashEntryHdr *hdr, const void *key)
|
|
{
|
|
RuleByWeightEntry* entry = static_cast<RuleByWeightEntry*>(hdr);
|
|
new (KnownNotNull, entry) RuleByWeightEntry();
|
|
}
|
|
|
|
static const PLDHashTableOps gRulesByWeightOps = {
|
|
HashIntKey,
|
|
MatchWeightEntry,
|
|
PLDHashTable::MoveEntryStub,
|
|
PLDHashTable::ClearEntryStub,
|
|
InitWeightEntry
|
|
};
|
|
|
|
struct CascadeEnumData {
|
|
CascadeEnumData(nsPresContext* aPresContext,
|
|
nsTArray<nsFontFaceRuleContainer>& aFontFaceRules,
|
|
nsTArray<nsCSSKeyframesRule*>& aKeyframesRules,
|
|
nsTArray<nsCSSFontFeatureValuesRule*>& aFontFeatureValuesRules,
|
|
nsTArray<nsCSSPageRule*>& aPageRules,
|
|
nsTArray<nsCSSCounterStyleRule*>& aCounterStyleRules,
|
|
nsTArray<css::DocumentRule*>& aDocumentRules,
|
|
nsMediaQueryResultCacheKey& aKey,
|
|
nsDocumentRuleResultCacheKey& aDocumentKey,
|
|
SheetType aSheetType,
|
|
bool aMustGatherDocumentRules)
|
|
: mPresContext(aPresContext),
|
|
mFontFaceRules(aFontFaceRules),
|
|
mKeyframesRules(aKeyframesRules),
|
|
mFontFeatureValuesRules(aFontFeatureValuesRules),
|
|
mPageRules(aPageRules),
|
|
mCounterStyleRules(aCounterStyleRules),
|
|
mDocumentRules(aDocumentRules),
|
|
mCacheKey(aKey),
|
|
mDocumentCacheKey(aDocumentKey),
|
|
mRulesByWeight(&gRulesByWeightOps, sizeof(RuleByWeightEntry), 32),
|
|
mSheetType(aSheetType),
|
|
mMustGatherDocumentRules(aMustGatherDocumentRules)
|
|
{
|
|
// Initialize our arena
|
|
PL_INIT_ARENA_POOL(&mArena, "CascadeEnumDataArena",
|
|
NS_CASCADEENUMDATA_ARENA_BLOCK_SIZE);
|
|
}
|
|
|
|
~CascadeEnumData()
|
|
{
|
|
PL_FinishArenaPool(&mArena);
|
|
}
|
|
|
|
nsPresContext* mPresContext;
|
|
nsTArray<nsFontFaceRuleContainer>& mFontFaceRules;
|
|
nsTArray<nsCSSKeyframesRule*>& mKeyframesRules;
|
|
nsTArray<nsCSSFontFeatureValuesRule*>& mFontFeatureValuesRules;
|
|
nsTArray<nsCSSPageRule*>& mPageRules;
|
|
nsTArray<nsCSSCounterStyleRule*>& mCounterStyleRules;
|
|
nsTArray<css::DocumentRule*>& mDocumentRules;
|
|
nsMediaQueryResultCacheKey& mCacheKey;
|
|
nsDocumentRuleResultCacheKey& mDocumentCacheKey;
|
|
PLArenaPool mArena;
|
|
// Hooray, a manual PLDHashTable since nsClassHashtable doesn't
|
|
// provide a getter that gives me a *reference* to the value.
|
|
PLDHashTable mRulesByWeight; // of PerWeightDataListItem linked lists
|
|
SheetType mSheetType;
|
|
bool mMustGatherDocumentRules;
|
|
};
|
|
|
|
/**
|
|
* Recursively traverses rules in order to:
|
|
* (1) add any @-moz-document rules into data->mDocumentRules.
|
|
* (2) record any @-moz-document rules whose conditions evaluate to true
|
|
* on data->mDocumentCacheKey.
|
|
*
|
|
* See also CascadeRuleEnumFunc below, which calls us via
|
|
* EnumerateRulesForwards. If modifying this function you may need to
|
|
* update CascadeRuleEnumFunc too.
|
|
*/
|
|
static bool
|
|
GatherDocRuleEnumFunc(css::Rule* aRule, void* aData)
|
|
{
|
|
CascadeEnumData* data = (CascadeEnumData*)aData;
|
|
int32_t type = aRule->GetType();
|
|
|
|
MOZ_ASSERT(data->mMustGatherDocumentRules,
|
|
"should only call GatherDocRuleEnumFunc if "
|
|
"mMustGatherDocumentRules is true");
|
|
|
|
if (css::Rule::MEDIA_RULE == type ||
|
|
css::Rule::SUPPORTS_RULE == type) {
|
|
css::GroupRule* groupRule = static_cast<css::GroupRule*>(aRule);
|
|
if (!groupRule->EnumerateRulesForwards(GatherDocRuleEnumFunc, aData)) {
|
|
return false;
|
|
}
|
|
}
|
|
else if (css::Rule::DOCUMENT_RULE == type) {
|
|
css::DocumentRule* docRule = static_cast<css::DocumentRule*>(aRule);
|
|
if (!data->mDocumentRules.AppendElement(docRule)) {
|
|
return false;
|
|
}
|
|
if (docRule->UseForPresentation(data->mPresContext)) {
|
|
if (!data->mDocumentCacheKey.AddMatchingRule(docRule)) {
|
|
return false;
|
|
}
|
|
}
|
|
if (!docRule->EnumerateRulesForwards(GatherDocRuleEnumFunc, aData)) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* This enumerates style rules in a sheet (and recursively into any
|
|
* grouping rules) in order to:
|
|
* (1) add any style rules, in order, into data->mRulesByWeight (for
|
|
* the primary CSS cascade), where they are separated by weight
|
|
* but kept in order per-weight, and
|
|
* (2) add any @font-face rules, in order, into data->mFontFaceRules.
|
|
* (3) add any @keyframes rules, in order, into data->mKeyframesRules.
|
|
* (4) add any @font-feature-value rules, in order,
|
|
* into data->mFontFeatureValuesRules.
|
|
* (5) add any @page rules, in order, into data->mPageRules.
|
|
* (6) add any @counter-style rules, in order, into data->mCounterStyleRules.
|
|
* (7) add any @-moz-document rules into data->mDocumentRules.
|
|
* (8) record any @-moz-document rules whose conditions evaluate to true
|
|
* on data->mDocumentCacheKey.
|
|
*
|
|
* See also GatherDocRuleEnumFunc above, which we call to traverse into
|
|
* @-moz-document rules even if their (or an ancestor's) condition
|
|
* fails. This means we might look at the result of some @-moz-document
|
|
* rules that don't actually affect whether a RuleProcessorCache lookup
|
|
* is a hit or a miss. The presence of @-moz-document rules inside
|
|
* @media etc. rules should be rare, and looking at all of them in the
|
|
* sheets lets us avoid the complication of having different document
|
|
* cache key results for different media.
|
|
*
|
|
* If modifying this function you may need to update
|
|
* GatherDocRuleEnumFunc too.
|
|
*/
|
|
static bool
|
|
CascadeRuleEnumFunc(css::Rule* aRule, void* aData)
|
|
{
|
|
CascadeEnumData* data = (CascadeEnumData*)aData;
|
|
int32_t type = aRule->GetType();
|
|
|
|
if (css::Rule::STYLE_RULE == type) {
|
|
css::StyleRule* styleRule = static_cast<css::StyleRule*>(aRule);
|
|
|
|
for (nsCSSSelectorList *sel = styleRule->Selector();
|
|
sel; sel = sel->mNext) {
|
|
int32_t weight = sel->mWeight;
|
|
auto entry = static_cast<RuleByWeightEntry*>
|
|
(data->mRulesByWeight.Add(NS_INT32_TO_PTR(weight), fallible));
|
|
if (!entry)
|
|
return false;
|
|
entry->data.mWeight = weight;
|
|
// entry->data.mRuleSelectorPairs should be linked in forward order;
|
|
// entry->data.mTail is the slot to write to.
|
|
auto* newItem =
|
|
new (data->mArena) PerWeightDataListItem(styleRule, sel->mSelectors);
|
|
if (newItem) {
|
|
*(entry->data.mTail) = newItem;
|
|
entry->data.mTail = &newItem->mNext;
|
|
}
|
|
}
|
|
}
|
|
else if (css::Rule::MEDIA_RULE == type ||
|
|
css::Rule::SUPPORTS_RULE == type) {
|
|
css::GroupRule* groupRule = static_cast<css::GroupRule*>(aRule);
|
|
const bool use =
|
|
groupRule->UseForPresentation(data->mPresContext, data->mCacheKey);
|
|
if (use || data->mMustGatherDocumentRules) {
|
|
if (!groupRule->EnumerateRulesForwards(use ? CascadeRuleEnumFunc :
|
|
GatherDocRuleEnumFunc,
|
|
aData)) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
else if (css::Rule::DOCUMENT_RULE == type) {
|
|
css::DocumentRule* docRule = static_cast<css::DocumentRule*>(aRule);
|
|
if (data->mMustGatherDocumentRules) {
|
|
if (!data->mDocumentRules.AppendElement(docRule)) {
|
|
return false;
|
|
}
|
|
}
|
|
const bool use = docRule->UseForPresentation(data->mPresContext);
|
|
if (use && data->mMustGatherDocumentRules) {
|
|
if (!data->mDocumentCacheKey.AddMatchingRule(docRule)) {
|
|
return false;
|
|
}
|
|
}
|
|
if (use || data->mMustGatherDocumentRules) {
|
|
if (!docRule->EnumerateRulesForwards(use ? CascadeRuleEnumFunc
|
|
: GatherDocRuleEnumFunc,
|
|
aData)) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
else if (css::Rule::FONT_FACE_RULE == type) {
|
|
nsCSSFontFaceRule *fontFaceRule = static_cast<nsCSSFontFaceRule*>(aRule);
|
|
nsFontFaceRuleContainer *ptr = data->mFontFaceRules.AppendElement();
|
|
if (!ptr)
|
|
return false;
|
|
ptr->mRule = fontFaceRule;
|
|
ptr->mSheetType = data->mSheetType;
|
|
}
|
|
else if (css::Rule::KEYFRAMES_RULE == type) {
|
|
nsCSSKeyframesRule *keyframesRule =
|
|
static_cast<nsCSSKeyframesRule*>(aRule);
|
|
if (!data->mKeyframesRules.AppendElement(keyframesRule)) {
|
|
return false;
|
|
}
|
|
}
|
|
else if (css::Rule::FONT_FEATURE_VALUES_RULE == type) {
|
|
nsCSSFontFeatureValuesRule *fontFeatureValuesRule =
|
|
static_cast<nsCSSFontFeatureValuesRule*>(aRule);
|
|
if (!data->mFontFeatureValuesRules.AppendElement(fontFeatureValuesRule)) {
|
|
return false;
|
|
}
|
|
}
|
|
else if (css::Rule::PAGE_RULE == type) {
|
|
nsCSSPageRule* pageRule = static_cast<nsCSSPageRule*>(aRule);
|
|
if (!data->mPageRules.AppendElement(pageRule)) {
|
|
return false;
|
|
}
|
|
}
|
|
else if (css::Rule::COUNTER_STYLE_RULE == type) {
|
|
nsCSSCounterStyleRule* counterStyleRule =
|
|
static_cast<nsCSSCounterStyleRule*>(aRule);
|
|
if (!data->mCounterStyleRules.AppendElement(counterStyleRule)) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* static */ bool
|
|
nsCSSRuleProcessor::CascadeSheet(CSSStyleSheet* aSheet, CascadeEnumData* aData)
|
|
{
|
|
if (aSheet->IsApplicable() &&
|
|
aSheet->UseForPresentation(aData->mPresContext, aData->mCacheKey) &&
|
|
aSheet->mInner) {
|
|
CSSStyleSheet* child = aSheet->mInner->mFirstChild;
|
|
while (child) {
|
|
CascadeSheet(child, aData);
|
|
child = child->mNext;
|
|
}
|
|
|
|
if (!aSheet->mInner->mOrderedRules.EnumerateForwards(CascadeRuleEnumFunc,
|
|
aData))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static int CompareWeightData(const void* aArg1, const void* aArg2,
|
|
void* closure)
|
|
{
|
|
const PerWeightData* arg1 = static_cast<const PerWeightData*>(aArg1);
|
|
const PerWeightData* arg2 = static_cast<const PerWeightData*>(aArg2);
|
|
return arg1->mWeight - arg2->mWeight; // put lower weight first
|
|
}
|
|
|
|
RuleCascadeData*
|
|
nsCSSRuleProcessor::GetRuleCascade(nsPresContext* aPresContext)
|
|
{
|
|
// FIXME: Make this infallible!
|
|
|
|
// If anything changes about the presentation context, we will be
|
|
// notified. Otherwise, our cache is valid if mLastPresContext
|
|
// matches aPresContext. (The only rule processors used for multiple
|
|
// pres contexts are for XBL. These rule processors are probably less
|
|
// likely to have @media rules, and thus the cache is pretty likely to
|
|
// hit instantly even when we're switching between pres contexts.)
|
|
|
|
if (!mRuleCascades || aPresContext != mLastPresContext) {
|
|
RefreshRuleCascade(aPresContext);
|
|
}
|
|
mLastPresContext = aPresContext;
|
|
|
|
return mRuleCascades;
|
|
}
|
|
|
|
void
|
|
nsCSSRuleProcessor::RefreshRuleCascade(nsPresContext* aPresContext)
|
|
{
|
|
// Having RuleCascadeData objects be per-medium (over all variation
|
|
// caused by media queries, handled through mCacheKey) works for now
|
|
// since nsCSSRuleProcessor objects are per-document. (For a given
|
|
// set of stylesheets they can vary based on medium (@media) or
|
|
// document (@-moz-document).)
|
|
|
|
for (RuleCascadeData **cascadep = &mRuleCascades, *cascade;
|
|
(cascade = *cascadep); cascadep = &cascade->mNext) {
|
|
if (cascade->mCacheKey.Matches(aPresContext)) {
|
|
// Ensure that the current one is always mRuleCascades.
|
|
*cascadep = cascade->mNext;
|
|
cascade->mNext = mRuleCascades;
|
|
mRuleCascades = cascade;
|
|
|
|
return;
|
|
}
|
|
}
|
|
|
|
// We're going to make a new rule cascade; this means that we should
|
|
// now stop using the previous cache key that we're holding on to from
|
|
// the last time we had rule cascades.
|
|
mPreviousCacheKey = nullptr;
|
|
|
|
if (mSheets.Length() != 0) {
|
|
nsAutoPtr<RuleCascadeData> newCascade(
|
|
new RuleCascadeData(aPresContext->Medium(),
|
|
eCompatibility_NavQuirks == aPresContext->CompatibilityMode()));
|
|
if (newCascade) {
|
|
CascadeEnumData data(aPresContext, newCascade->mFontFaceRules,
|
|
newCascade->mKeyframesRules,
|
|
newCascade->mFontFeatureValuesRules,
|
|
newCascade->mPageRules,
|
|
newCascade->mCounterStyleRules,
|
|
mDocumentRules,
|
|
newCascade->mCacheKey,
|
|
mDocumentCacheKey,
|
|
mSheetType,
|
|
mMustGatherDocumentRules);
|
|
|
|
for (uint32_t i = 0; i < mSheets.Length(); ++i) {
|
|
if (!CascadeSheet(mSheets.ElementAt(i), &data))
|
|
return; /* out of memory */
|
|
}
|
|
|
|
// Sort the hash table of per-weight linked lists by weight.
|
|
uint32_t weightCount = data.mRulesByWeight.EntryCount();
|
|
auto weightArray = MakeUnique<PerWeightData[]>(weightCount);
|
|
int32_t j = 0;
|
|
for (auto iter = data.mRulesByWeight.Iter(); !iter.Done(); iter.Next()) {
|
|
auto entry = static_cast<const RuleByWeightEntry*>(iter.Get());
|
|
weightArray[j++] = entry->data;
|
|
}
|
|
NS_QuickSort(weightArray.get(), weightCount, sizeof(PerWeightData),
|
|
CompareWeightData, nullptr);
|
|
|
|
// Put things into the rule hash.
|
|
// The primary sort is by weight...
|
|
for (uint32_t i = 0; i < weightCount; ++i) {
|
|
// and the secondary sort is by order. mRuleSelectorPairs is already in
|
|
// the right order..
|
|
for (PerWeightDataListItem *cur = weightArray[i].mRuleSelectorPairs;
|
|
cur;
|
|
cur = cur->mNext) {
|
|
if (!AddRule(cur, newCascade))
|
|
return; /* out of memory */
|
|
}
|
|
}
|
|
|
|
// Build mKeyframesRuleTable.
|
|
for (nsTArray<nsCSSKeyframesRule*>::size_type i = 0,
|
|
iEnd = newCascade->mKeyframesRules.Length(); i < iEnd; ++i) {
|
|
nsCSSKeyframesRule* rule = newCascade->mKeyframesRules[i];
|
|
newCascade->mKeyframesRuleTable.Put(rule->GetName(), rule);
|
|
}
|
|
|
|
// Build mCounterStyleRuleTable
|
|
for (nsTArray<nsCSSCounterStyleRule*>::size_type i = 0,
|
|
iEnd = newCascade->mCounterStyleRules.Length(); i < iEnd; ++i) {
|
|
nsCSSCounterStyleRule* rule = newCascade->mCounterStyleRules[i];
|
|
newCascade->mCounterStyleRuleTable.Put(rule->GetName(), rule);
|
|
}
|
|
|
|
// mMustGatherDocumentRules controls whether we build mDocumentRules
|
|
// and mDocumentCacheKey so that they can be used as keys by the
|
|
// RuleProcessorCache, as obtained by TakeDocumentRulesAndCacheKey
|
|
// later. We set it to false just below so that we only do this
|
|
// the first time we build a RuleProcessorCache for a shared rule
|
|
// processor.
|
|
//
|
|
// An up-to-date mDocumentCacheKey is only needed if we
|
|
// are still in the RuleProcessorCache (as we store a copy of the
|
|
// cache key in the RuleProcessorCache), and an up-to-date
|
|
// mDocumentRules is only needed at the time TakeDocumentRulesAndCacheKey
|
|
// is called, which is immediately after the rule processor is created
|
|
// (by nsStyleSet).
|
|
//
|
|
// Note that when nsCSSRuleProcessor::ClearRuleCascades is called,
|
|
// by CSSStyleSheet::ClearRuleCascades, we will have called
|
|
// RuleProcessorCache::RemoveSheet, which will remove the rule
|
|
// processor from the cache. (This is because the list of document
|
|
// rules now may not match the one used as they key in the
|
|
// RuleProcessorCache.)
|
|
//
|
|
// Thus, as we'll no longer be in the RuleProcessorCache, and we won't
|
|
// have TakeDocumentRulesAndCacheKey called on us, we don't need to ensure
|
|
// mDocumentCacheKey and mDocumentRules are up-to-date after the
|
|
// first time GetRuleCascade is called.
|
|
if (mMustGatherDocumentRules) {
|
|
mDocumentRules.Sort();
|
|
mDocumentCacheKey.Finalize();
|
|
mMustGatherDocumentRules = false;
|
|
#ifdef DEBUG
|
|
mDocumentRulesAndCacheKeyValid = true;
|
|
#endif
|
|
}
|
|
|
|
// Ensure that the current one is always mRuleCascades.
|
|
newCascade->mNext = mRuleCascades;
|
|
mRuleCascades = newCascade.forget();
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
/* static */ bool
|
|
nsCSSRuleProcessor::SelectorListMatches(Element* aElement,
|
|
TreeMatchContext& aTreeMatchContext,
|
|
nsCSSSelectorList* aSelectorList)
|
|
{
|
|
MOZ_ASSERT(!aTreeMatchContext.mForScopedStyle,
|
|
"mCurrentStyleScope will need to be saved and restored after the "
|
|
"SelectorMatchesTree call");
|
|
|
|
while (aSelectorList) {
|
|
nsCSSSelector* sel = aSelectorList->mSelectors;
|
|
NS_ASSERTION(sel, "Should have *some* selectors");
|
|
NS_ASSERTION(!sel->IsPseudoElement(), "Shouldn't have been called");
|
|
NodeMatchContext nodeContext(EventStates(), false);
|
|
if (SelectorMatches(aElement, sel, nodeContext, aTreeMatchContext,
|
|
SelectorMatchesFlags::NONE)) {
|
|
nsCSSSelector* next = sel->mNext;
|
|
if (!next ||
|
|
SelectorMatchesTree(aElement, next, aTreeMatchContext,
|
|
SelectorMatchesTreeFlags(0))) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
aSelectorList = aSelectorList->mNext;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void
|
|
nsCSSRuleProcessor::TakeDocumentRulesAndCacheKey(
|
|
nsPresContext* aPresContext,
|
|
nsTArray<css::DocumentRule*>& aDocumentRules,
|
|
nsDocumentRuleResultCacheKey& aCacheKey)
|
|
{
|
|
MOZ_ASSERT(mIsShared);
|
|
|
|
GetRuleCascade(aPresContext);
|
|
MOZ_ASSERT(mDocumentRulesAndCacheKeyValid);
|
|
|
|
aDocumentRules.Clear();
|
|
aDocumentRules.SwapElements(mDocumentRules);
|
|
aCacheKey.Swap(mDocumentCacheKey);
|
|
|
|
#ifdef DEBUG
|
|
mDocumentRulesAndCacheKeyValid = false;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
nsCSSRuleProcessor::AddStyleSetRef()
|
|
{
|
|
MOZ_ASSERT(mIsShared);
|
|
if (++mStyleSetRefCnt == 1) {
|
|
RuleProcessorCache::StopTracking(this);
|
|
}
|
|
}
|
|
|
|
void
|
|
nsCSSRuleProcessor::ReleaseStyleSetRef()
|
|
{
|
|
MOZ_ASSERT(mIsShared);
|
|
MOZ_ASSERT(mStyleSetRefCnt > 0);
|
|
if (--mStyleSetRefCnt == 0 && mInRuleProcessorCache) {
|
|
RuleProcessorCache::StartTracking(this);
|
|
}
|
|
}
|
|
|
|
// TreeMatchContext and AncestorFilter out of line methods
|
|
void
|
|
TreeMatchContext::InitAncestors(Element *aElement)
|
|
{
|
|
MOZ_ASSERT(!mAncestorFilter.mFilter);
|
|
MOZ_ASSERT(mAncestorFilter.mHashes.IsEmpty());
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|
MOZ_ASSERT(mStyleScopes.IsEmpty());
|
|
|
|
mAncestorFilter.mFilter = new AncestorFilter::Filter();
|
|
|
|
if (MOZ_LIKELY(aElement)) {
|
|
MOZ_ASSERT(aElement->GetUncomposedDoc() ||
|
|
aElement->HasFlag(NODE_IS_IN_SHADOW_TREE),
|
|
"aElement must be in the document or in shadow tree "
|
|
"for the assumption that GetParentNode() is non-null "
|
|
"on all element ancestors of aElement to be true");
|
|
// Collect up the ancestors
|
|
AutoTArray<Element*, 50> ancestors;
|
|
Element* cur = aElement;
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|
do {
|
|
ancestors.AppendElement(cur);
|
|
cur = cur->GetParentElementCrossingShadowRoot();
|
|
} while (cur);
|
|
|
|
// Now push them in reverse order.
|
|
for (uint32_t i = ancestors.Length(); i-- != 0; ) {
|
|
mAncestorFilter.PushAncestor(ancestors[i]);
|
|
PushStyleScope(ancestors[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
TreeMatchContext::InitStyleScopes(Element* aElement)
|
|
{
|
|
MOZ_ASSERT(mStyleScopes.IsEmpty());
|
|
|
|
if (MOZ_LIKELY(aElement)) {
|
|
// Collect up the ancestors
|
|
AutoTArray<Element*, 50> ancestors;
|
|
Element* cur = aElement;
|
|
do {
|
|
ancestors.AppendElement(cur);
|
|
cur = cur->GetParentElementCrossingShadowRoot();
|
|
} while (cur);
|
|
|
|
// Now push them in reverse order.
|
|
for (uint32_t i = ancestors.Length(); i-- != 0; ) {
|
|
PushStyleScope(ancestors[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
AncestorFilter::PushAncestor(Element *aElement)
|
|
{
|
|
MOZ_ASSERT(mFilter);
|
|
|
|
uint32_t oldLength = mHashes.Length();
|
|
|
|
mPopTargets.AppendElement(oldLength);
|
|
#ifdef DEBUG
|
|
mElements.AppendElement(aElement);
|
|
#endif
|
|
mHashes.AppendElement(aElement->NodeInfo()->NameAtom()->hash());
|
|
nsIAtom *id = aElement->GetID();
|
|
if (id) {
|
|
mHashes.AppendElement(id->hash());
|
|
}
|
|
const nsAttrValue *classes = aElement->GetClasses();
|
|
if (classes) {
|
|
uint32_t classCount = classes->GetAtomCount();
|
|
for (uint32_t i = 0; i < classCount; ++i) {
|
|
mHashes.AppendElement(classes->AtomAt(i)->hash());
|
|
}
|
|
}
|
|
|
|
uint32_t newLength = mHashes.Length();
|
|
for (uint32_t i = oldLength; i < newLength; ++i) {
|
|
mFilter->add(mHashes[i]);
|
|
}
|
|
}
|
|
|
|
void
|
|
AncestorFilter::PopAncestor()
|
|
{
|
|
MOZ_ASSERT(!mPopTargets.IsEmpty());
|
|
MOZ_ASSERT(mPopTargets.Length() == mElements.Length());
|
|
|
|
uint32_t popTargetLength = mPopTargets.Length();
|
|
uint32_t newLength = mPopTargets[popTargetLength-1];
|
|
|
|
mPopTargets.TruncateLength(popTargetLength-1);
|
|
#ifdef DEBUG
|
|
mElements.TruncateLength(popTargetLength-1);
|
|
#endif
|
|
|
|
uint32_t oldLength = mHashes.Length();
|
|
for (uint32_t i = newLength; i < oldLength; ++i) {
|
|
mFilter->remove(mHashes[i]);
|
|
}
|
|
mHashes.TruncateLength(newLength);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
void
|
|
AncestorFilter::AssertHasAllAncestors(Element *aElement) const
|
|
{
|
|
Element* cur = aElement->GetParentElementCrossingShadowRoot();
|
|
while (cur) {
|
|
MOZ_ASSERT(mElements.Contains(cur));
|
|
cur = cur->GetParentElementCrossingShadowRoot();
|
|
}
|
|
}
|
|
|
|
void
|
|
TreeMatchContext::AssertHasAllStyleScopes(Element* aElement) const
|
|
{
|
|
if (aElement->IsInNativeAnonymousSubtree()) {
|
|
// Document style sheets are never applied to native anonymous content,
|
|
// so it's not possible for them to be in a <style scoped> scope.
|
|
return;
|
|
}
|
|
Element* cur = aElement->GetParentElementCrossingShadowRoot();
|
|
while (cur) {
|
|
if (cur->IsScopedStyleRoot()) {
|
|
MOZ_ASSERT(mStyleScopes.Contains(cur));
|
|
}
|
|
cur = cur->GetParentElementCrossingShadowRoot();
|
|
}
|
|
}
|
|
#endif
|