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gecko/layout/style/nsCSSRuleProcessor.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:tabstop=2:expandtab:shiftwidth=2:
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* style rule processor for CSS style sheets, responsible for selector
* matching and cascading
*/
#include "mozilla/Util.h"
#include "nsCSSRuleProcessor.h"
#include "nsRuleProcessorData.h"
#include <algorithm>
#define PL_ARENA_CONST_ALIGN_MASK 7
// We want page-sized arenas so there's no fragmentation involved.
#define NS_CASCADEENUMDATA_ARENA_BLOCK_SIZE (4096)
#include "plarena.h"
#include "nsCRT.h"
#include "nsIAtom.h"
#include "pldhash.h"
#include "nsICSSPseudoComparator.h"
#include "mozilla/css/StyleRule.h"
#include "mozilla/css/GroupRule.h"
#include "nsIDocument.h"
#include "nsPresContext.h"
#include "nsEventStateManager.h"
#include "nsGkAtoms.h"
#include "nsString.h"
#include "nsUnicharUtils.h"
#include "nsError.h"
#include "nsRuleWalker.h"
#include "nsCSSPseudoClasses.h"
#include "nsCSSPseudoElements.h"
#include "nsIContent.h"
#include "nsCOMPtr.h"
#include "nsHashKeys.h"
#include "nsStyleUtil.h"
#include "nsQuickSort.h"
#include "nsAttrValue.h"
#include "nsAttrValueInlines.h"
#include "nsAttrName.h"
#include "nsServiceManagerUtils.h"
#include "nsTArray.h"
#include "nsContentUtils.h"
#include "nsIMediaList.h"
#include "nsCSSRules.h"
#include "nsIPrincipal.h"
#include "nsStyleSet.h"
#include "prlog.h"
#include "nsIObserverService.h"
#include "nsNetCID.h"
#include "mozilla/Services.h"
#include "mozilla/dom/Element.h"
#include "nsNthIndexCache.h"
#include "mozilla/Preferences.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/Likely.h"
using namespace mozilla;
using namespace mozilla::dom;
#define VISITED_PSEUDO_PREF "layout.css.visited_links_enabled"
static bool gSupportVisitedPseudo = true;
static nsTArray< nsCOMPtr<nsIAtom> >* sSystemMetrics = 0;
#ifdef XP_WIN
uint8_t nsCSSRuleProcessor::sWinThemeId = LookAndFeel::eWindowsTheme_Generic;
#endif
/**
* A struct representing a given CSS rule and a particular selector
* from that rule's selector list.
*/
struct RuleSelectorPair {
RuleSelectorPair(css::StyleRule* aRule, nsCSSSelector* aSelector)
: mRule(aRule), mSelector(aSelector) {}
// If this class ever grows a destructor, deal with
// PerWeightDataListItem appropriately.
css::StyleRule* mRule;
nsCSSSelector* mSelector; // which of |mRule|'s selectors
};
#define NS_IS_ANCESTOR_OPERATOR(ch) \
((ch) == PRUnichar(' ') || (ch) == PRUnichar('>'))
/**
* A struct representing a particular rule in an ordered list of rules
* (the ordering depending on the weight of mSelector and the order of
* our rules to start with).
*/
struct RuleValue : RuleSelectorPair {
enum {
eMaxAncestorHashes = 4
};
RuleValue(const RuleSelectorPair& aRuleSelectorPair, int32_t aIndex,
bool aQuirksMode) :
RuleSelectorPair(aRuleSelectorPair),
mIndex(aIndex)
{
CollectAncestorHashes(aQuirksMode);
}
int32_t mIndex; // High index means high weight/order.
uint32_t mAncestorSelectorHashes[eMaxAncestorHashes];
private:
void CollectAncestorHashes(bool aQuirksMode) {
// Collect up our mAncestorSelectorHashes. It's not clear whether it's
// better to stop once we've found eMaxAncestorHashes of them or to keep
// going and preferentially collect information from selectors higher up the
// chain... Let's do the former for now.
size_t hashIndex = 0;
for (nsCSSSelector* sel = mSelector->mNext; sel; sel = sel->mNext) {
if (!NS_IS_ANCESTOR_OPERATOR(sel->mOperator)) {
// |sel| is going to select something that's not actually one of our
// ancestors, so don't add it to mAncestorSelectorHashes. But keep
// going, because it'll select a sibling of one of our ancestors, so its
// ancestors would be our ancestors too.
continue;
}
// Now sel is supposed to select one of our ancestors. Grab
// whatever info we can from it into mAncestorSelectorHashes.
// But in qurks mode, don't grab IDs and classes because those
// need to be matched case-insensitively.
if (!aQuirksMode) {
nsAtomList* ids = sel->mIDList;
while (ids) {
mAncestorSelectorHashes[hashIndex++] = ids->mAtom->hash();
if (hashIndex == eMaxAncestorHashes) {
return;
}
ids = ids->mNext;
}
nsAtomList* classes = sel->mClassList;
while (classes) {
mAncestorSelectorHashes[hashIndex++] = classes->mAtom->hash();
if (hashIndex == eMaxAncestorHashes) {
return;
}
classes = classes->mNext;
}
}
// Only put in the tag name if it's all-lowercase. Otherwise we run into
// trouble because we may test the wrong one of mLowercaseTag and
// mCasedTag against the filter.
if (sel->mLowercaseTag && sel->mCasedTag == sel->mLowercaseTag) {
mAncestorSelectorHashes[hashIndex++] = sel->mLowercaseTag->hash();
if (hashIndex == eMaxAncestorHashes) {
return;
}
}
}
while (hashIndex != eMaxAncestorHashes) {
mAncestorSelectorHashes[hashIndex++] = 0;
}
}
};
// ------------------------------
// Rule hash table
//
// Uses any of the sets of ops below.
struct RuleHashTableEntry : public PLDHashEntryHdr {
// If you add members that have heap allocated memory be sure to change the
// logic in SizeOfRuleHashTableEntry().
// Auto length 1, because we always have at least one entry in mRules.
nsAutoTArray<RuleValue, 1> mRules;
};
struct RuleHashTagTableEntry : public RuleHashTableEntry {
// If you add members that have heap allocated memory be sure to change the
// logic in RuleHash::SizeOf{In,Ex}cludingThis.
nsCOMPtr<nsIAtom> mTag;
};
static PLDHashNumber
RuleHash_CIHashKey(PLDHashTable *table, const void *key)
{
nsIAtom *atom = const_cast<nsIAtom*>(static_cast<const nsIAtom*>(key));
nsAutoString str;
atom->ToString(str);
nsContentUtils::ASCIIToLower(str);
return HashString(str);
}
typedef nsIAtom*
(* RuleHashGetKey) (PLDHashTable *table, const PLDHashEntryHdr *entry);
struct RuleHashTableOps {
PLDHashTableOps ops;
// Extra callback to avoid duplicating the matchEntry callback for
// each table. (There used to be a getKey callback in
// PLDHashTableOps.)
RuleHashGetKey getKey;
};
inline const RuleHashTableOps*
ToLocalOps(const PLDHashTableOps *aOps)
{
return (const RuleHashTableOps*)
(((const char*) aOps) - offsetof(RuleHashTableOps, ops));
}
static bool
RuleHash_CIMatchEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
const void *key)
{
nsIAtom *match_atom = const_cast<nsIAtom*>(static_cast<const nsIAtom*>
(key));
// Use our extra |getKey| callback to avoid code duplication.
nsIAtom *entry_atom = ToLocalOps(table->ops)->getKey(table, hdr);
// Check for case-sensitive match first.
if (match_atom == entry_atom)
return true;
// Use EqualsIgnoreASCIICase instead of full on unicode case conversion
// in order to save on performance. This is only used in quirks mode
// anyway.
return
nsContentUtils::EqualsIgnoreASCIICase(nsDependentAtomString(entry_atom),
nsDependentAtomString(match_atom));
}
static bool
RuleHash_CSMatchEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
const void *key)
{
nsIAtom *match_atom = const_cast<nsIAtom*>(static_cast<const nsIAtom*>
(key));
// Use our extra |getKey| callback to avoid code duplication.
nsIAtom *entry_atom = ToLocalOps(table->ops)->getKey(table, hdr);
return match_atom == entry_atom;
}
static bool
RuleHash_InitEntry(PLDHashTable *table, PLDHashEntryHdr *hdr,
const void *key)
{
RuleHashTableEntry* entry = static_cast<RuleHashTableEntry*>(hdr);
new (entry) RuleHashTableEntry();
return true;
}
static void
RuleHash_ClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
{
RuleHashTableEntry* entry = static_cast<RuleHashTableEntry*>(hdr);
entry->~RuleHashTableEntry();
}
static void
RuleHash_MoveEntry(PLDHashTable *table, const PLDHashEntryHdr *from,
PLDHashEntryHdr *to)
{
NS_PRECONDITION(from != to, "This is not going to work!");
RuleHashTableEntry *oldEntry =
const_cast<RuleHashTableEntry*>(
static_cast<const RuleHashTableEntry*>(from));
RuleHashTableEntry *newEntry = new (to) RuleHashTableEntry();
newEntry->mRules.SwapElements(oldEntry->mRules);
oldEntry->~RuleHashTableEntry();
}
static bool
RuleHash_TagTable_MatchEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
const void *key)
{
nsIAtom *match_atom = const_cast<nsIAtom*>(static_cast<const nsIAtom*>
(key));
nsIAtom *entry_atom = static_cast<const RuleHashTagTableEntry*>(hdr)->mTag;
return match_atom == entry_atom;
}
static bool
RuleHash_TagTable_InitEntry(PLDHashTable *table, PLDHashEntryHdr *hdr,
const void *key)
{
RuleHashTagTableEntry* entry = static_cast<RuleHashTagTableEntry*>(hdr);
new (entry) RuleHashTagTableEntry();
entry->mTag = const_cast<nsIAtom*>(static_cast<const nsIAtom*>(key));
return true;
}
static void
RuleHash_TagTable_ClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
{
RuleHashTagTableEntry* entry = static_cast<RuleHashTagTableEntry*>(hdr);
entry->~RuleHashTagTableEntry();
}
static void
RuleHash_TagTable_MoveEntry(PLDHashTable *table, const PLDHashEntryHdr *from,
PLDHashEntryHdr *to)
{
NS_PRECONDITION(from != to, "This is not going to work!");
RuleHashTagTableEntry *oldEntry =
const_cast<RuleHashTagTableEntry*>(
static_cast<const RuleHashTagTableEntry*>(from));
RuleHashTagTableEntry *newEntry = new (to) RuleHashTagTableEntry();
newEntry->mTag.swap(oldEntry->mTag);
newEntry->mRules.SwapElements(oldEntry->mRules);
oldEntry->~RuleHashTagTableEntry();
}
static nsIAtom*
RuleHash_ClassTable_GetKey(PLDHashTable *table, const PLDHashEntryHdr *hdr)
{
const RuleHashTableEntry *entry =
static_cast<const RuleHashTableEntry*>(hdr);
return entry->mRules[0].mSelector->mClassList->mAtom;
}
static nsIAtom*
RuleHash_IdTable_GetKey(PLDHashTable *table, const PLDHashEntryHdr *hdr)
{
const RuleHashTableEntry *entry =
static_cast<const RuleHashTableEntry*>(hdr);
return entry->mRules[0].mSelector->mIDList->mAtom;
}
static PLDHashNumber
RuleHash_NameSpaceTable_HashKey(PLDHashTable *table, const void *key)
{
return NS_PTR_TO_INT32(key);
}
static bool
RuleHash_NameSpaceTable_MatchEntry(PLDHashTable *table,
const PLDHashEntryHdr *hdr,
const void *key)
{
const RuleHashTableEntry *entry =
static_cast<const RuleHashTableEntry*>(hdr);
return NS_PTR_TO_INT32(key) ==
entry->mRules[0].mSelector->mNameSpace;
}
static const PLDHashTableOps RuleHash_TagTable_Ops = {
PL_DHashAllocTable,
PL_DHashFreeTable,
PL_DHashVoidPtrKeyStub,
RuleHash_TagTable_MatchEntry,
RuleHash_TagTable_MoveEntry,
RuleHash_TagTable_ClearEntry,
PL_DHashFinalizeStub,
RuleHash_TagTable_InitEntry
};
// Case-sensitive ops.
static const RuleHashTableOps RuleHash_ClassTable_CSOps = {
{
PL_DHashAllocTable,
PL_DHashFreeTable,
PL_DHashVoidPtrKeyStub,
RuleHash_CSMatchEntry,
RuleHash_MoveEntry,
RuleHash_ClearEntry,
PL_DHashFinalizeStub,
RuleHash_InitEntry
},
RuleHash_ClassTable_GetKey
};
// Case-insensitive ops.
static const RuleHashTableOps RuleHash_ClassTable_CIOps = {
{
PL_DHashAllocTable,
PL_DHashFreeTable,
RuleHash_CIHashKey,
RuleHash_CIMatchEntry,
RuleHash_MoveEntry,
RuleHash_ClearEntry,
PL_DHashFinalizeStub,
RuleHash_InitEntry
},
RuleHash_ClassTable_GetKey
};
// Case-sensitive ops.
static const RuleHashTableOps RuleHash_IdTable_CSOps = {
{
PL_DHashAllocTable,
PL_DHashFreeTable,
PL_DHashVoidPtrKeyStub,
RuleHash_CSMatchEntry,
RuleHash_MoveEntry,
RuleHash_ClearEntry,
PL_DHashFinalizeStub,
RuleHash_InitEntry
},
RuleHash_IdTable_GetKey
};
// Case-insensitive ops.
static const RuleHashTableOps RuleHash_IdTable_CIOps = {
{
PL_DHashAllocTable,
PL_DHashFreeTable,
RuleHash_CIHashKey,
RuleHash_CIMatchEntry,
RuleHash_MoveEntry,
RuleHash_ClearEntry,
PL_DHashFinalizeStub,
RuleHash_InitEntry
},
RuleHash_IdTable_GetKey
};
static const PLDHashTableOps RuleHash_NameSpaceTable_Ops = {
PL_DHashAllocTable,
PL_DHashFreeTable,
RuleHash_NameSpaceTable_HashKey,
RuleHash_NameSpaceTable_MatchEntry,
RuleHash_MoveEntry,
RuleHash_ClearEntry,
PL_DHashFinalizeStub,
RuleHash_InitEntry
};
#undef RULE_HASH_STATS
#undef PRINT_UNIVERSAL_RULES
#ifdef RULE_HASH_STATS
#define RULE_HASH_STAT_INCREMENT(var_) PR_BEGIN_MACRO ++(var_); PR_END_MACRO
#else
#define RULE_HASH_STAT_INCREMENT(var_) PR_BEGIN_MACRO PR_END_MACRO
#endif
struct NodeMatchContext;
class RuleHash {
public:
RuleHash(bool aQuirksMode);
~RuleHash();
void AppendRule(const RuleSelectorPair &aRuleInfo);
void EnumerateAllRules(Element* aElement, ElementDependentRuleProcessorData* aData,
NodeMatchContext& aNodeMatchContext);
size_t SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const;
size_t SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const;
protected:
typedef nsTArray<RuleValue> RuleValueList;
void AppendRuleToTable(PLDHashTable* aTable, const void* aKey,
const RuleSelectorPair& aRuleInfo);
void AppendUniversalRule(const RuleSelectorPair& aRuleInfo);
int32_t mRuleCount;
// The hashtables are lazily initialized; we use a null .ops to
// indicate that they need initialization.
PLDHashTable mIdTable;
PLDHashTable mClassTable;
PLDHashTable mTagTable;
PLDHashTable mNameSpaceTable;
RuleValueList mUniversalRules;
struct EnumData {
const RuleValue* mCurValue;
const RuleValue* mEnd;
};
EnumData* mEnumList;
int32_t mEnumListSize;
bool mQuirksMode;
inline EnumData ToEnumData(const RuleValueList& arr) {
EnumData data = { arr.Elements(), arr.Elements() + arr.Length() };
return data;
}
#ifdef RULE_HASH_STATS
uint32_t mUniversalSelectors;
uint32_t mNameSpaceSelectors;
uint32_t mTagSelectors;
uint32_t mClassSelectors;
uint32_t mIdSelectors;
uint32_t mElementsMatched;
uint32_t mElementUniversalCalls;
uint32_t mElementNameSpaceCalls;
uint32_t mElementTagCalls;
uint32_t mElementClassCalls;
uint32_t mElementIdCalls;
#endif // RULE_HASH_STATS
};
RuleHash::RuleHash(bool aQuirksMode)
: mRuleCount(0),
mUniversalRules(0),
mEnumList(nullptr), mEnumListSize(0),
mQuirksMode(aQuirksMode)
#ifdef RULE_HASH_STATS
,
mUniversalSelectors(0),
mNameSpaceSelectors(0),
mTagSelectors(0),
mClassSelectors(0),
mIdSelectors(0),
mElementsMatched(0),
mElementUniversalCalls(0),
mElementNameSpaceCalls(0),
mElementTagCalls(0),
mElementClassCalls(0),
mElementIdCalls(0)
#endif
{
MOZ_COUNT_CTOR(RuleHash);
mTagTable.ops = nullptr;
mIdTable.ops = nullptr;
mClassTable.ops = nullptr;
mNameSpaceTable.ops = nullptr;
}
RuleHash::~RuleHash()
{
MOZ_COUNT_DTOR(RuleHash);
#ifdef RULE_HASH_STATS
printf(
"RuleHash(%p):\n"
" Selectors: Universal (%u) NameSpace(%u) Tag(%u) Class(%u) Id(%u)\n"
" 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();
nsCOMPtr<nsIStyleSheet> sheet;
value->mRule->GetStyleSheet(*getter_AddRefs(sheet));
nsRefPtr<nsCSSStyleSheet> cssSheet = do_QueryObject(sheet);
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;
}
// delete arena for strings and small objects
if (mIdTable.ops) {
PL_DHashTableFinish(&mIdTable);
}
if (mClassTable.ops) {
PL_DHashTableFinish(&mClassTable);
}
if (mTagTable.ops) {
PL_DHashTableFinish(&mTagTable);
}
if (mNameSpaceTable.ops) {
PL_DHashTableFinish(&mNameSpaceTable);
}
}
void RuleHash::AppendRuleToTable(PLDHashTable* aTable, const void* aKey,
const RuleSelectorPair& aRuleInfo)
{
// Get a new or existing entry.
RuleHashTableEntry *entry = static_cast<RuleHashTableEntry*>
(PL_DHashTableOperate(aTable, aKey, PL_DHASH_ADD));
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
RuleHashTagTableEntry *entry = static_cast<RuleHashTagTableEntry*>
(PL_DHashTableOperate(aTable, aKey, PL_DHASH_ADD));
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 (nullptr != selector->mIDList) {
if (!mIdTable.ops) {
PL_DHashTableInit(&mIdTable,
mQuirksMode ? &RuleHash_IdTable_CIOps.ops
: &RuleHash_IdTable_CSOps.ops,
nullptr, sizeof(RuleHashTableEntry), 16);
}
AppendRuleToTable(&mIdTable, selector->mIDList->mAtom, aRuleInfo);
RULE_HASH_STAT_INCREMENT(mIdSelectors);
}
else if (nullptr != selector->mClassList) {
if (!mClassTable.ops) {
PL_DHashTableInit(&mClassTable,
mQuirksMode ? &RuleHash_ClassTable_CIOps.ops
: &RuleHash_ClassTable_CSOps.ops,
nullptr, sizeof(RuleHashTableEntry), 16);
}
AppendRuleToTable(&mClassTable, selector->mClassList->mAtom, aRuleInfo);
RULE_HASH_STAT_INCREMENT(mClassSelectors);
}
else if (selector->mLowercaseTag) {
RuleValue ruleValue(aRuleInfo, mRuleCount++, mQuirksMode);
if (!mTagTable.ops) {
PL_DHashTableInit(&mTagTable, &RuleHash_TagTable_Ops, nullptr,
sizeof(RuleHashTagTableEntry), 16);
}
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) {
if (!mNameSpaceTable.ops) {
PL_DHashTableInit(&mNameSpaceTable, &RuleHash_NameSpaceTable_Ops, nullptr,
sizeof(RuleHashTableEntry), 16);
}
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->Tag();
nsIAtom* id = aElement->GetID();
const nsAttrValue* classList = aElement->GetClasses();
NS_ABORT_IF_FALSE(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.ops) {
RuleHashTableEntry *entry = static_cast<RuleHashTableEntry*>
(PL_DHashTableOperate(&mNameSpaceTable, NS_INT32_TO_PTR(nameSpace),
PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_BUSY(entry)) {
mEnumList[valueCount++] = ToEnumData(entry->mRules);
RULE_HASH_STAT_INCREMENT_LIST_COUNT(entry->mRules, mElementNameSpaceCalls);
}
}
if (mTagTable.ops) {
RuleHashTableEntry *entry = static_cast<RuleHashTableEntry*>
(PL_DHashTableOperate(&mTagTable, tag, PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_BUSY(entry)) {
mEnumList[valueCount++] = ToEnumData(entry->mRules);
RULE_HASH_STAT_INCREMENT_LIST_COUNT(entry->mRules, mElementTagCalls);
}
}
if (id && mIdTable.ops) {
RuleHashTableEntry *entry = static_cast<RuleHashTableEntry*>
(PL_DHashTableOperate(&mIdTable, id, PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_BUSY(entry)) {
mEnumList[valueCount++] = ToEnumData(entry->mRules);
RULE_HASH_STAT_INCREMENT_LIST_COUNT(entry->mRules, mElementIdCalls);
}
}
if (mClassTable.ops) {
for (int32_t index = 0; index < classCount; ++index) {
RuleHashTableEntry *entry = static_cast<RuleHashTableEntry*>
(PL_DHashTableOperate(&mClassTable, classList->AtomAt(index),
PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_BUSY(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
SizeOfRuleHashTableEntry(PLDHashEntryHdr* aHdr, nsMallocSizeOfFun aMallocSizeOf, void *)
{
RuleHashTableEntry* entry = static_cast<RuleHashTableEntry*>(aHdr);
return entry->mRules.SizeOfExcludingThis(aMallocSizeOf);
}
size_t
RuleHash::SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
size_t n = 0;
if (mIdTable.ops) {
n += PL_DHashTableSizeOfExcludingThis(&mIdTable,
SizeOfRuleHashTableEntry,
aMallocSizeOf);
}
if (mClassTable.ops) {
n += PL_DHashTableSizeOfExcludingThis(&mClassTable,
SizeOfRuleHashTableEntry,
aMallocSizeOf);
}
if (mTagTable.ops) {
n += PL_DHashTableSizeOfExcludingThis(&mTagTable,
SizeOfRuleHashTableEntry,
aMallocSizeOf);
}
if (mNameSpaceTable.ops) {
n += PL_DHashTableSizeOfExcludingThis(&mNameSpaceTable,
SizeOfRuleHashTableEntry,
aMallocSizeOf);
}
n += mUniversalRules.SizeOfExcludingThis(aMallocSizeOf);
return n;
}
size_t
RuleHash::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
//--------------------------------
// 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.
nsAutoTArray<nsCSSSelector*, 2> mSelectors;
};
static void
AtomSelector_ClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
{
(static_cast<AtomSelectorEntry*>(hdr))->~AtomSelectorEntry();
}
static bool
AtomSelector_InitEntry(PLDHashTable *table, PLDHashEntryHdr *hdr,
const void *key)
{
AtomSelectorEntry *entry = static_cast<AtomSelectorEntry*>(hdr);
new (entry) AtomSelectorEntry();
entry->mAtom = const_cast<nsIAtom*>(static_cast<const nsIAtom*>(key));
return true;
}
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));
AtomSelectorEntry *newEntry = new (to) AtomSelectorEntry();
newEntry->mAtom = oldEntry->mAtom;
newEntry->mSelectors.SwapElements(oldEntry->mSelectors);
oldEntry->~AtomSelectorEntry();
}
static nsIAtom*
AtomSelector_GetKey(PLDHashTable *table, const PLDHashEntryHdr *hdr)
{
const AtomSelectorEntry *entry = static_cast<const AtomSelectorEntry*>(hdr);
return entry->mAtom;
}
// Case-sensitive ops.
static const PLDHashTableOps AtomSelector_CSOps = {
PL_DHashAllocTable,
PL_DHashFreeTable,
PL_DHashVoidPtrKeyStub,
PL_DHashMatchEntryStub,
AtomSelector_MoveEntry,
AtomSelector_ClearEntry,
PL_DHashFinalizeStub,
AtomSelector_InitEntry
};
// Case-insensitive ops.
static const RuleHashTableOps AtomSelector_CIOps = {
{
PL_DHashAllocTable,
PL_DHashFreeTable,
RuleHash_CIHashKey,
RuleHash_CIMatchEntry,
AtomSelector_MoveEntry,
AtomSelector_ClearEntry,
PL_DHashFinalizeStub,
AtomSelector_InitEntry
},
AtomSelector_GetKey
};
//--------------------------------
struct RuleCascadeData {
RuleCascadeData(nsIAtom *aMedium, bool aQuirksMode)
: mRuleHash(aQuirksMode),
mStateSelectors(),
mSelectorDocumentStates(0),
mCacheKey(aMedium),
mNext(nullptr),
mQuirksMode(aQuirksMode)
{
// 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.
PL_DHashTableInit(&mAttributeSelectors, &AtomSelector_CSOps, nullptr,
sizeof(AtomSelectorEntry), 16);
PL_DHashTableInit(&mAnonBoxRules, &RuleHash_TagTable_Ops, nullptr,
sizeof(RuleHashTagTableEntry), 16);
PL_DHashTableInit(&mIdSelectors,
aQuirksMode ? &AtomSelector_CIOps.ops :
&AtomSelector_CSOps,
nullptr, sizeof(AtomSelectorEntry), 16);
PL_DHashTableInit(&mClassSelectors,
aQuirksMode ? &AtomSelector_CIOps.ops :
&AtomSelector_CSOps,
nullptr, sizeof(AtomSelectorEntry), 16);
memset(mPseudoElementRuleHashes, 0, sizeof(mPseudoElementRuleHashes));
#ifdef MOZ_XUL
PL_DHashTableInit(&mXULTreeRules, &RuleHash_TagTable_Ops, nullptr,
sizeof(RuleHashTagTableEntry), 16);
#endif
}
~RuleCascadeData()
{
PL_DHashTableFinish(&mAttributeSelectors);
PL_DHashTableFinish(&mAnonBoxRules);
PL_DHashTableFinish(&mIdSelectors);
PL_DHashTableFinish(&mClassSelectors);
#ifdef MOZ_XUL
PL_DHashTableFinish(&mXULTreeRules);
#endif
for (uint32_t i = 0; i < ArrayLength(mPseudoElementRuleHashes); ++i) {
delete mPseudoElementRuleHashes[i];
}
}
size_t SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const;
RuleHash mRuleHash;
RuleHash*
mPseudoElementRuleHashes[nsCSSPseudoElements::ePseudo_PseudoElementCount];
nsTArray<nsCSSRuleProcessor::StateSelector> mStateSelectors;
nsEventStates 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<nsCSSPageRule*> mPageRules;
// Looks up or creates the appropriate list in |mAttributeSelectors|.
// Returns null only on allocation failure.
nsTArray<nsCSSSelector*>* AttributeListFor(nsIAtom* aAttribute);
nsMediaQueryResultCacheKey mCacheKey;
RuleCascadeData* mNext; // for a different medium
const bool mQuirksMode;
};
static size_t
SizeOfSelectorsEntry(PLDHashEntryHdr* aHdr, nsMallocSizeOfFun aMallocSizeOf, void *)
{
AtomSelectorEntry* entry = static_cast<AtomSelectorEntry*>(aHdr);
return entry->mSelectors.SizeOfExcludingThis(aMallocSizeOf);
}
size_t
RuleCascadeData::SizeOfIncludingThis(nsMallocSizeOfFun 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.SizeOfExcludingThis(aMallocSizeOf);
n += PL_DHashTableSizeOfExcludingThis(&mIdSelectors,
SizeOfSelectorsEntry, aMallocSizeOf);
n += PL_DHashTableSizeOfExcludingThis(&mClassSelectors,
SizeOfSelectorsEntry, aMallocSizeOf);
n += mPossiblyNegatedClassSelectors.SizeOfExcludingThis(aMallocSizeOf);
n += mPossiblyNegatedIDSelectors.SizeOfExcludingThis(aMallocSizeOf);
n += PL_DHashTableSizeOfExcludingThis(&mAttributeSelectors,
SizeOfSelectorsEntry, aMallocSizeOf);
n += PL_DHashTableSizeOfExcludingThis(&mAnonBoxRules,
SizeOfRuleHashTableEntry, aMallocSizeOf);
#ifdef MOZ_XUL
n += PL_DHashTableSizeOfExcludingThis(&mXULTreeRules,
SizeOfRuleHashTableEntry, aMallocSizeOf);
#endif
n += mFontFaceRules.SizeOfExcludingThis(aMallocSizeOf);
n += mKeyframesRules.SizeOfExcludingThis(aMallocSizeOf);
n += mPageRules.SizeOfExcludingThis(aMallocSizeOf);
return n;
}
nsTArray<nsCSSSelector*>*
RuleCascadeData::AttributeListFor(nsIAtom* aAttribute)
{
AtomSelectorEntry *entry =
static_cast<AtomSelectorEntry*>
(PL_DHashTableOperate(&mAttributeSelectors, aAttribute,
PL_DHASH_ADD));
if (!entry)
return nullptr;
return &entry->mSelectors;
}
// -------------------------------
// CSS Style rule processor implementation
//
nsCSSRuleProcessor::nsCSSRuleProcessor(const sheet_array_type& aSheets,
uint8_t aSheetType,
Element* aScopeElement)
: mSheets(aSheets)
, mRuleCascades(nullptr)
, mLastPresContext(nullptr)
, mScopeElement(aScopeElement)
, mSheetType(aSheetType)
{
NS_ASSERTION(!!mScopeElement == (aSheetType == nsStyleSet::eScopedDocSheet),
"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()
{
for (sheet_array_type::size_type i = mSheets.Length(); i-- != 0; ) {
mSheets[i]->DropRuleProcessor(this);
}
mSheets.Clear();
ClearRuleCascades();
}
NS_IMPL_ISUPPORTS1(nsCSSRuleProcessor, nsIStyleRuleProcessor)
/* static */ nsresult
nsCSSRuleProcessor::Startup()
{
Preferences::AddBoolVarCache(&gSupportVisitedPseudo, VISITED_PSEUDO_PREF,
true);
return NS_OK;
}
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_ImagesInMenus);
if (metricResult) {
sSystemMetrics->AppendElement(nsGkAtoms::images_in_menus);
}
metricResult =
LookAndFeel::GetInt(LookAndFeel::eIntID_ImagesInButtons);
if (metricResult) {
sSystemMetrics->AppendElement(nsGkAtoms::images_in_buttons);
}
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_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_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_MaemoClassic, &metricResult);
if (NS_SUCCEEDED(rv) && metricResult) {
sSystemMetrics->AppendElement(nsGkAtoms::maemo_classic);
}
rv = LookAndFeel::GetInt(LookAndFeel::eIntID_SwipeAnimationEnabled,
&metricResult);
if (NS_SUCCEEDED(rv) && metricResult) {
sSystemMetrics->AppendElement(nsGkAtoms::swipe_animation_enabled);
}
#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_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 */
nsEventStates
nsCSSRuleProcessor::GetContentState(Element* aElement, const TreeMatchContext& aTreeMatchContext)
{
nsEventStates 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(Element* aElement)
{
nsEventStates state = aElement->StyleState();
return state.HasAtLeastOneOfStates(NS_EVENT_STATE_VISITED | NS_EVENT_STATE_UNVISITED);
}
/* static */
nsEventStates
nsCSSRuleProcessor::GetContentStateForVisitedHandling(
Element* aElement,
const TreeMatchContext& aTreeMatchContext,
nsRuleWalker::VisitedHandlingType aVisitedHandling,
bool aIsRelevantLink)
{
nsEventStates contentState = GetContentState(aElement, aTreeMatchContext);
if (contentState.HasAtLeastOneOfStates(NS_EVENT_STATE_VISITED | NS_EVENT_STATE_UNVISITED)) {
NS_ABORT_IF_FALSE(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 nsEventStates 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(nsEventStates aStateMask, bool aIsRelevantLink)
: mStateMask(aStateMask)
, mIsRelevantLink(aIsRelevantLink)
{
}
};
static bool ValueIncludes(const nsSubstring& aValueList,
const nsSubstring& aValue,
const nsStringComparator& aComparator)
{
const PRUnichar *p = aValueList.BeginReading(),
*p_end = aValueList.EndReading();
while (p < p_end) {
// skip leading space
while (p != p_end && nsContentUtils::IsHTMLWhitespace(*p))
++p;
const PRUnichar *val_start = p;
// look for space or end
while (p != p_end && !nsContentUtils::IsHTMLWhitespace(*p))
++p;
const PRUnichar *val_end = p;
if (val_start < val_end &&
aValue.Equals(Substring(val_start, val_end), aComparator))
return true;
++p; // we know the next character is not whitespace
}
return false;
}
// Return whether we should apply a "global" (i.e., universal-tag)
// selector for event states in quirks mode. Note that
// |IsLink()| is checked separately by the caller, so we return
// false for |nsGkAtoms::a|, which here means a named anchor.
inline bool IsQuirkEventSensitive(nsIAtom *aContentTag)
{
return bool ((nsGkAtoms::button == aContentTag) ||
(nsGkAtoms::img == aContentTag) ||
(nsGkAtoms::input == aContentTag) ||
(nsGkAtoms::label == aContentTag) ||
(nsGkAtoms::select == aContentTag) ||
(nsGkAtoms::textarea == aContentTag));
}
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->mCaseSensitive || !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 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) {
return false;
}
if (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) {
return false;
}
if (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 int32_t n = (index - b) / a;
return n >= 0 && (a * n == index - b);
}
static inline bool
edgeOfTypeMatches(Element* aElement, TreeMatchContext& aTreeMatchContext,
bool checkFirst, bool checkLast)
{
nsIContent *parent = aElement->GetParent();
if (!parent) {
return false;
}
if (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 nsEventStates sPseudoClassStateDependences[] = {
#define CSS_PSEUDO_CLASS(_name, _value, _pref) \
nsEventStates(),
#define CSS_STATE_DEPENDENT_PSEUDO_CLASS(_name, _value, _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.
nsEventStates(),
nsEventStates()
};
static const nsEventStates sPseudoClassStates[] = {
#define CSS_PSEUDO_CLASS(_name, _value, _pref) \
nsEventStates(),
#define CSS_STATE_PSEUDO_CLASS(_name, _value, _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.
nsEventStates(),
nsEventStates()
};
MOZ_STATIC_ASSERT(NS_ARRAY_LENGTH(sPseudoClassStates) ==
nsCSSPseudoClasses::ePseudoClass_NotPseudoClass + 1,
"ePseudoClass_NotPseudoClass is no longer at the end of"
"sPseudoClassStates");
// |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,
bool* const aDependence = nullptr)
{
NS_PRECONDITION(!aSelector->IsPseudoElement(),
"Pseudo-element snuck into SelectorMatches?");
NS_ABORT_IF_FALSE(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->IsHTML()) ?
aSelector->mLowercaseTag : aSelector->mCasedTag;
if (selectorTag != aElement->Tag()) {
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) {
nsEventStates statesToCheck = sPseudoClassStates[pseudoClass->mType];
if (statesToCheck.IsEmpty()) {
// keep the cases here in the same order as the list in
// nsCSSPseudoClassList.h
switch (pseudoClass->mType) {
case nsCSSPseudoClasses::ePseudoClass_empty:
if (!checkGenericEmptyMatches(aElement, aTreeMatchContext, true)) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozOnlyWhitespace:
if (!checkGenericEmptyMatches(aElement, aTreeMatchContext, false)) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_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->Tag()->Equals(nsDependentString(pseudoClass->u.mString)))));
if (child != nullptr) {
return false;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_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;
aElement->GetLang(language);
if (!language.IsEmpty()) {
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(PRUnichar(','), 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;
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozBoundElement:
if (aTreeMatchContext.mScopedRoot != aElement) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_root:
if (aElement != aElement->OwnerDoc()->GetRootElement()) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_any:
{
nsCSSSelectorList *l;
for (l = pseudoClass->u.mSelectors; l; l = l->mNext) {
nsCSSSelector *s = l->mSelectors;
NS_ABORT_IF_FALSE(!s->mNext && !s->IsPseudoElement(),
"parser failed");
if (SelectorMatches(aElement, s, aNodeMatchContext,
aTreeMatchContext)) {
break;
}
}
if (!l) {
return false;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_firstChild:
if (!edgeChildMatches(aElement, aTreeMatchContext, true, false)) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_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 nsCSSPseudoClasses::ePseudoClass_lastChild:
if (!edgeChildMatches(aElement, aTreeMatchContext, false, true)) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_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 nsCSSPseudoClasses::ePseudoClass_onlyChild:
if (!edgeChildMatches(aElement, aTreeMatchContext, true, true)) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_firstOfType:
if (!edgeOfTypeMatches(aElement, aTreeMatchContext, true, false)) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_lastOfType:
if (!edgeOfTypeMatches(aElement, aTreeMatchContext, false, true)) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_onlyOfType:
if (!edgeOfTypeMatches(aElement, aTreeMatchContext, true, true)) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_nthChild:
if (!nthChildGenericMatches(aElement, aTreeMatchContext, pseudoClass,
false, false)) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_nthLastChild:
if (!nthChildGenericMatches(aElement, aTreeMatchContext, pseudoClass,
false, true)) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_nthOfType:
if (!nthChildGenericMatches(aElement, aTreeMatchContext, pseudoClass,
true, false)) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_nthLastOfType:
if (!nthChildGenericMatches(aElement, aTreeMatchContext, pseudoClass,
true, true)) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozIsHTML:
if (!aTreeMatchContext.mIsHTMLDocument || !aElement->IsHTML()) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozSystemMetric:
{
nsCOMPtr<nsIAtom> metric = do_GetAtom(pseudoClass->u.mString);
if (!nsCSSRuleProcessor::HasSystemMetric(metric)) {
return false;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozLocaleDir:
{
bool docIsRTL =
aTreeMatchContext.mDocument->GetDocumentState().
HasState(NS_DOCUMENT_STATE_RTL_LOCALE);
nsDependentString dirString(pseudoClass->u.mString);
NS_ASSERTION(dirString.EqualsLiteral("ltr") ||
dirString.EqualsLiteral("rtl"),
"invalid value for -moz-locale-dir");
if (dirString.EqualsLiteral("rtl") != docIsRTL) {
return false;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozLWTheme:
{
if (aTreeMatchContext.mDocument->GetDocumentLWTheme() <=
nsIDocument::Doc_Theme_None) {
return false;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozLWThemeBrightText:
{
if (aTreeMatchContext.mDocument->GetDocumentLWTheme() !=
nsIDocument::Doc_Theme_Bright) {
return false;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozLWThemeDarkText:
{
if (aTreeMatchContext.mDocument->GetDocumentLWTheme() !=
nsIDocument::Doc_Theme_Dark) {
return false;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozWindowInactive:
if (!aTreeMatchContext.mDocument->GetDocumentState().
HasState(NS_DOCUMENT_STATE_WINDOW_INACTIVE)) {
return false;
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozTableBorderNonzero:
{
if (!aElement->IsHTML(nsGkAtoms::table)) {
return false;
}
const nsAttrValue *val = aElement->GetParsedAttr(nsGkAtoms::border);
if (!val ||
(val->Type() == nsAttrValue::eInteger &&
val->GetIntegerValue() == 0)) {
return false;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_dir:
{
if (aDependence) {
nsEventStates states
= sPseudoClassStateDependences[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, and this could be just
//
// if (dirString.EqualsLiteral("rtl") !=
// aElement->StyleState().HasState(NS_EVENT_STATE_RTL)
//
// However, in markup languages where there is no direction attribute
// we have to consider the possibility that neither -moz-dir(rtl) nor
// -moz-dir(ltr) matches.
nsEventStates state = aElement->StyleState();
bool elementIsRTL = state.HasState(NS_EVENT_STATE_RTL);
bool elementIsLTR = state.HasState(NS_EVENT_STATE_LTR);
nsDependentString dirString(pseudoClass->u.mString);
if ((dirString.EqualsLiteral("rtl") && !elementIsRTL) ||
(dirString.EqualsLiteral("ltr") && !elementIsLTR)) {
return false;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_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:
NS_ABORT_IF_FALSE(false, "How did that happen?");
}
} else {
// Bit-based pseudo-classes
if (statesToCheck.HasAtLeastOneOfStates(NS_EVENT_STATE_HOVER | NS_EVENT_STATE_ACTIVE) &&
aTreeMatchContext.mCompatMode == eCompatibility_NavQuirks &&
// global selector:
!aSelector->HasTagSelector() && !aSelector->mIDList &&
!aSelector->mClassList && !aSelector->mAttrList &&
// This (or the other way around) both make :not() asymmetric
// in quirks mode (and it's hard to work around since we're
// testing the current mNegations, not the first
// (unnegated)). This at least makes it closer to the spec.
!isNegated &&
// important for |IsQuirkEventSensitive|:
aElement->IsHTML() && !nsCSSRuleProcessor::IsLink(aElement) &&
!IsQuirkEventSensitive(aElement->Tag())) {
// In quirks mode, only make certain elements sensitive to
// selectors ":hover" and ":active".
return false;
} else {
if (aTreeMatchContext.mForStyling &&
statesToCheck.HasAtLeastOneOfStates(NS_EVENT_STATE_HOVER)) {
// Mark the element as having :hover-dependent style
aElement->SetFlags(NODE_HAS_RELEVANT_HOVER_RULES);
}
if (aNodeMatchContext.mStateMask.HasAtLeastOneOfStates(statesToCheck)) {
if (aDependence)
*aDependence = true;
} else {
nsEventStates contentState =
nsCSSRuleProcessor::GetContentStateForVisitedHandling(
aElement,
aTreeMatchContext,
aTreeMatchContext.VisitedHandling(),
aNodeMatchContext.mIsRelevantLink);
if (!contentState.HasAtLeastOneOfStates(statesToCheck)) {
return false;
}
}
}
}
}
bool result = true;
if (aSelector->mAttrList) {
// test for attribute match
uint32_t attrCount = aElement->GetAttrCount();
if (attrCount == 0) {
// 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->IsHTML());
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;
for (uint32_t i = 0; i < attrCount; ++i) {
const nsAttrName* attrName = aElement->GetAttrNameAt(i);
NS_ASSERTION(attrName, "GetAttrCount lied or GetAttrNameAt failed");
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,
(!isHTML || attr->mCaseSensitive) ? 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, &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
// 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) == PRUnichar(' ') || (ch) == PRUnichar('~'))
static bool SelectorMatchesTree(Element* aPrevElement,
nsCSSSelector* aSelector,
TreeMatchContext& aTreeMatchContext,
bool aLookForRelevantLink)
{
nsCSSSelector* selector = aSelector;
Element* prevElement = aPrevElement;
while (selector) { // check compound selectors
NS_ASSERTION(!selector->mNext ||
selector->mNext->mOperator != PRUnichar(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 (PRUnichar('+') == selector->mOperator ||
PRUnichar('~') == selector->mOperator) {
// The relevant link must be an ancestor of the node being matched.
aLookForRelevantLink = false;
nsIContent* parent = prevElement->GetParent();
if (parent) {
if (aTreeMatchContext.mForStyling)
parent->SetFlags(NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS);
int32_t index = parent->IndexOf(prevElement);
while (0 <= --index) {
nsIContent* content = parent->GetChildAt(index);
if (content->IsElement()) {
element = content->AsElement();
break;
}
}
}
}
// 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);
}
}
}
if (!element) {
return false;
}
NodeMatchContext nodeContext(nsEventStates(),
aLookForRelevantLink &&
nsCSSRuleProcessor::IsLink(element));
if (nodeContext.mIsRelevantLink) {
// 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.
aLookForRelevantLink = false;
aTreeMatchContext.SetHaveRelevantLink();
}
if (SelectorMatches(element, selector, nodeContext, aTreeMatchContext)) {
// 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...)
if (SelectorMatchesTree(element, selector, aTreeMatchContext,
aLookForRelevantLink)) {
return true;
}
}
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;
}
if (SelectorMatches(data->mElement, aSelector, nodeContext,
data->mTreeMatchContext)) {
nsCSSSelector *next = aSelector->mNext;
if (!next || SelectorMatchesTree(data->mElement, next,
data->mTreeMatchContext,
!nodeContext.mIsRelevantLink)) {
css::StyleRule *rule = value.mRule;
rule->RuleMatched();
data->mRuleWalker->Forward(rule);
// nsStyleSet will deal with the !important rule
}
}
}
/* virtual */ void
nsCSSRuleProcessor::RulesMatching(ElementRuleProcessorData *aData)
{
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
if (cascade) {
NodeMatchContext nodeContext(nsEventStates(),
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[aData->mPseudoType];
if (ruleHash) {
NodeMatchContext nodeContext(nsEventStates(),
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) {
RuleHashTagTableEntry* entry = static_cast<RuleHashTagTableEntry*>
(PL_DHashTableOperate(&cascade->mAnonBoxRules, aData->mPseudoTag,
PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_BUSY(entry)) {
nsTArray<RuleValue>& rules = entry->mRules;
for (RuleValue *value = rules.Elements(), *end = value + rules.Length();
value != end; ++value) {
value->mRule->RuleMatched();
aData->mRuleWalker->Forward(value->mRule);
}
}
}
}
#ifdef MOZ_XUL
/* virtual */ void
nsCSSRuleProcessor::RulesMatching(XULTreeRuleProcessorData* aData)
{
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
if (cascade && cascade->mXULTreeRules.entryCount) {
RuleHashTagTableEntry* entry = static_cast<RuleHashTagTableEntry*>
(PL_DHashTableOperate(&cascade->mXULTreeRules, aData->mPseudoTag,
PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_BUSY(entry)) {
NodeMatchContext nodeContext(nsEventStates(),
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(PRUnichar oper)
{
if (oper == PRUnichar('+') || oper == PRUnichar('~')) {
return eRestyle_LaterSiblings;
}
if (oper != PRUnichar(0)) {
return eRestyle_Subtree;
}
return eRestyle_Self;
}
nsRestyleHint
nsCSSRuleProcessor::HasStateDependentStyle(StateRuleProcessorData* aData)
{
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(aData->mStateMask, false);
for(; iter != end; ++iter) {
nsCSSSelector* selector = iter->mSelector;
nsEventStates states = iter->mStates;
nsRestyleHint possibleChange = RestyleHintForOp(selector->mOperator);
// 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(aData->mStateMask) &&
// We can optimize away testing selectors that only involve :hover, a
// namespace, and a tag name against nodes that don't have the
// NODE_HAS_RELEVANT_HOVER_RULES flag: such a selector didn't match
// the tag name or namespace the first time around (since the :hover
// didn't set the NODE_HAS_RELEVANT_HOVER_RULES 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 ||
aData->mElement->HasFlag(NODE_HAS_RELEVANT_HOVER_RULES) ||
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 !=
nsCSSPseudoClasses::ePseudoClass_hover)) ||
selector->mAttrList || selector->mNegations) &&
SelectorMatches(aData->mElement, selector, nodeContext,
aData->mTreeMatchContext) &&
SelectorMatchesTree(aData->mElement, selector->mNext,
aData->mTreeMatchContext,
false))
{
hint = nsRestyleHint(hint | possibleChange);
}
}
}
return hint;
}
bool
nsCSSRuleProcessor::HasDocumentStateDependentStyle(StateRuleProcessorData* aData)
{
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
return cascade && cascade->mSelectorDocumentStates.HasAtLeastOneOfStates(aData->mStateMask);
}
struct AttributeEnumData {
AttributeEnumData(AttributeRuleProcessorData *aData)
: data(aData), change(nsRestyleHint(0)) {}
AttributeRuleProcessorData *data;
nsRestyleHint change;
};
static void
AttributeEnumFunc(nsCSSSelector* aSelector, 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 = RestyleHintForOp(aSelector->mOperator);
// If 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.
NodeMatchContext nodeContext(nsEventStates(), false);
if ((possibleChange & ~(aData->change)) &&
SelectorMatches(data->mElement, aSelector, nodeContext,
data->mTreeMatchContext) &&
SelectorMatchesTree(data->mElement, aSelector->mNext,
data->mTreeMatchContext, false)) {
aData->change = nsRestyleHint(aData->change | possibleChange);
}
}
nsRestyleHint
nsCSSRuleProcessor::HasAttributeDependentStyle(AttributeRuleProcessorData* aData)
{
// 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);
// 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 == aData->mElement->GetIDAttributeName()) {
nsIAtom* id = aData->mElement->GetID();
if (id) {
AtomSelectorEntry *entry =
static_cast<AtomSelectorEntry*>
(PL_DHashTableOperate(&cascade->mIdSelectors,
id, PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_BUSY(entry)) {
nsCSSSelector **iter = entry->mSelectors.Elements(),
**end = iter + entry->mSelectors.Length();
for(; iter != end; ++iter) {
AttributeEnumFunc(*iter, &data);
}
}
}
nsCSSSelector **iter = cascade->mPossiblyNegatedIDSelectors.Elements(),
**end = iter + cascade->mPossiblyNegatedIDSelectors.Length();
for(; iter != end; ++iter) {
AttributeEnumFunc(*iter, &data);
}
}
if (aData->mAttribute == aData->mElement->GetClassAttributeName()) {
const nsAttrValue* elementClasses = aData->mElement->GetClasses();
if (elementClasses) {
int32_t atomCount = elementClasses->GetAtomCount();
for (int32_t i = 0; i < atomCount; ++i) {
nsIAtom* curClass = elementClasses->AtomAt(i);
AtomSelectorEntry *entry =
static_cast<AtomSelectorEntry*>
(PL_DHashTableOperate(&cascade->mClassSelectors,
curClass, PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_BUSY(entry)) {
nsCSSSelector **iter = entry->mSelectors.Elements(),
**end = iter + entry->mSelectors.Length();
for(; iter != end; ++iter) {
AttributeEnumFunc(*iter, &data);
}
}
}
}
nsCSSSelector **iter = cascade->mPossiblyNegatedClassSelectors.Elements(),
**end = iter +
cascade->mPossiblyNegatedClassSelectors.Length();
for (; iter != end; ++iter) {
AttributeEnumFunc(*iter, &data);
}
}
AtomSelectorEntry *entry =
static_cast<AtomSelectorEntry*>
(PL_DHashTableOperate(&cascade->mAttributeSelectors,
aData->mAttribute, PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_BUSY(entry)) {
nsCSSSelector **iter = entry->mSelectors.Elements(),
**end = iter + entry->mSelectors.Length();
for(; iter != end; ++iter) {
AttributeEnumFunc(*iter, &data);
}
}
}
return data.change;
}
/* virtual */ bool
nsCSSRuleProcessor::MediumFeaturesChanged(nsPresContext* aPresContext)
{
RuleCascadeData *old = mRuleCascades;
// We don't want to do anything if there aren't any sets of rules
// cached yet (or somebody cleared them and is thus responsible for
// rebuilding things), 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. See bug 448281.
if (old) {
RefreshRuleCascade(aPresContext);
}
return (old != mRuleCascades);
}
/* virtual */ size_t
nsCSSRuleProcessor::SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
size_t n = 0;
n += mSheets.SizeOfExcludingThis(aMallocSizeOf);
for (RuleCascadeData* cascade = mRuleCascades; cascade;
cascade = cascade->mNext) {
n += cascade->SizeOfIncludingThis(aMallocSizeOf);
}
return n;
}
/* virtual */ size_t
nsCSSRuleProcessor::SizeOfIncludingThis(nsMallocSizeOfFun 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;
}
// Append all the currently-active keyframes rules to aArray. Return
// true for success and false for failure.
bool
nsCSSRuleProcessor::AppendKeyframesRules(
nsPresContext *aPresContext,
nsTArray<nsCSSKeyframesRule*>& aArray)
{
RuleCascadeData* cascade = GetRuleCascade(aPresContext);
if (cascade) {
if (!aArray.AppendElements(cascade->mKeyframesRules))
return false;
}
return true;
}
// 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;
}
nsresult
nsCSSRuleProcessor::ClearRuleCascades()
{
// We rely on our caller (perhaps indirectly) to do something that
// will rebuild style data and the user font set (either
// nsIPresShell::ReconstructStyleData 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
nsEventStates ComputeSelectorStateDependence(nsCSSSelector& aSelector)
{
nsEventStates 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 >= nsCSSPseudoClasses::ePseudoClass_Count) {
continue;
}
states |= sPseudoClassStateDependences[pseudoClass->mType];
}
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)
{
// 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 nsCSSPseudoClasses::ePseudoClass_mozLocaleDir: {
aCascade->mSelectorDocumentStates |= NS_DOCUMENT_STATE_RTL_LOCALE;
break;
}
case nsCSSPseudoClasses::ePseudoClass_mozWindowInactive: {
aCascade->mSelectorDocumentStates |= NS_DOCUMENT_STATE_WINDOW_INACTIVE;
break;
}
case nsCSSPseudoClasses::ePseudoClass_mozTableBorderNonzero: {
nsTArray<nsCSSSelector*> *array =
aCascade->AttributeListFor(nsGkAtoms::border);
if (!array) {
return false;
}
array->AppendElement(aSelectorInTopLevel);
break;
}
default: {
break;
}
}
}
// Build mStateSelectors.
nsEventStates 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) {
AtomSelectorEntry *entry =
static_cast<AtomSelectorEntry*>(PL_DHashTableOperate(&aCascade->mIdSelectors,
curID->mAtom,
PL_DHASH_ADD));
if (entry) {
entry->mSelectors.AppendElement(aSelectorInTopLevel);
}
}
} else if (negation->mIDList) {
aCascade->mPossiblyNegatedIDSelectors.AppendElement(aSelectorInTopLevel);
}
// Build mClassSelectors
if (negation == aSelectorInTopLevel) {
for (nsAtomList* curClass = negation->mClassList; curClass;
curClass = curClass->mNext) {
AtomSelectorEntry *entry =
static_cast<AtomSelectorEntry*>(PL_DHashTableOperate(&aCascade->mClassSelectors,
curClass->mAtom,
PL_DHASH_ADD));
if (entry) {
entry->mSelectors.AppendElement(aSelectorInTopLevel);
}
}
} else if (negation->mClassList) {
aCascade->mPossiblyNegatedClassSelectors.AppendElement(aSelectorInTopLevel);
}
// Build mAttributeSelectors.
for (nsAttrSelector *attr = negation->mAttrList; attr;
attr = attr->mNext) {
nsTArray<nsCSSSelector*> *array =
aCascade->AttributeListFor(attr->mCasedAttr);
if (!array) {
return false;
}
array->AppendElement(aSelectorInTopLevel);
if (attr->mLowercaseAttr != attr->mCasedAttr) {
array = aCascade->AttributeListFor(attr->mLowercaseAttr);
if (!array) {
return false;
}
array->AppendElement(aSelectorInTopLevel);
}
}
// Recur through any :-moz-any selectors
for (nsPseudoClassList* pseudoClass = negation->mPseudoClassList;
pseudoClass; pseudoClass = pseudoClass->mNext) {
if (pseudoClass->mType == nsCSSPseudoClasses::ePseudoClass_any) {
for (nsCSSSelectorList *l = pseudoClass->u.mSelectors; l; l = l->mNext) {
nsCSSSelector *s = l->mSelectors;
if (!AddSelector(aCascade, aSelectorInTopLevel, s)) {
return false;
}
}
}
}
}
return true;
}
static bool
AddRule(RuleSelectorPair* aRuleInfo, RuleCascadeData* aCascade)
{
RuleCascadeData * const cascade = aCascade;
// Build the rule hash.
nsCSSPseudoElements::Type pseudoType = aRuleInfo->mSelector->PseudoType();
if (MOZ_LIKELY(pseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement)) {
cascade->mRuleHash.AppendRule(*aRuleInfo);
} else if (pseudoType < nsCSSPseudoElements::ePseudo_PseudoElementCount) {
RuleHash*& ruleHash = cascade->mPseudoElementRuleHashes[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");
aRuleInfo->mSelector = aRuleInfo->mSelector->mNext;
ruleHash->AppendRule(*aRuleInfo);
} else if (pseudoType == nsCSSPseudoElements::ePseudo_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 == nsCSSPseudoElements::ePseudo_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()) {
NS_ASSERTION(!selector->mNegations, "Shouldn't have negations");
// Make sure these selectors don't end up in the hashtables we use to
// match against actual elements, no matter what. Normally they wouldn't
// anyway, but trees overload mPseudoClassList with weird stuff.
continue;
}
if (!AddSelector(cascade, selector, selector)) {
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(PLDHashTable *table, const void *key)
{
return PLDHashNumber(NS_PTR_TO_INT32(key));
}
static bool
MatchWeightEntry(PLDHashTable *table, const PLDHashEntryHdr *hdr,
const void *key)
{
const RuleByWeightEntry *entry = (const RuleByWeightEntry *)hdr;
return entry->data.mWeight == NS_PTR_TO_INT32(key);
}
static bool
InitWeightEntry(PLDHashTable *table, PLDHashEntryHdr *hdr,
const void *key)
{
RuleByWeightEntry* entry = static_cast<RuleByWeightEntry*>(hdr);
new (entry) RuleByWeightEntry();
return true;
}
static PLDHashTableOps gRulesByWeightOps = {
PL_DHashAllocTable,
PL_DHashFreeTable,
HashIntKey,
MatchWeightEntry,
PL_DHashMoveEntryStub,
PL_DHashClearEntryStub,
PL_DHashFinalizeStub,
InitWeightEntry
};
struct CascadeEnumData {
CascadeEnumData(nsPresContext* aPresContext,
nsTArray<nsFontFaceRuleContainer>& aFontFaceRules,
nsTArray<nsCSSKeyframesRule*>& aKeyframesRules,
nsTArray<nsCSSPageRule*>& aPageRules,
nsMediaQueryResultCacheKey& aKey,
uint8_t aSheetType)
: mPresContext(aPresContext),
mFontFaceRules(aFontFaceRules),
mKeyframesRules(aKeyframesRules),
mPageRules(aPageRules),
mCacheKey(aKey),
mSheetType(aSheetType)
{
if (!PL_DHashTableInit(&mRulesByWeight, &gRulesByWeightOps, nullptr,
sizeof(RuleByWeightEntry), 64))
mRulesByWeight.ops = nullptr;
// Initialize our arena
PL_INIT_ARENA_POOL(&mArena, "CascadeEnumDataArena",
NS_CASCADEENUMDATA_ARENA_BLOCK_SIZE);
}
~CascadeEnumData()
{
if (mRulesByWeight.ops)
PL_DHashTableFinish(&mRulesByWeight);
PL_FinishArenaPool(&mArena);
}
nsPresContext* mPresContext;
nsTArray<nsFontFaceRuleContainer>& mFontFaceRules;
nsTArray<nsCSSKeyframesRule*>& mKeyframesRules;
nsTArray<nsCSSPageRule*>& mPageRules;
nsMediaQueryResultCacheKey& mCacheKey;
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
uint8_t mSheetType;
};
/*
* 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 @page rules, in order, into data->mPageRules.
*/
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;
RuleByWeightEntry *entry = static_cast<RuleByWeightEntry*>(
PL_DHashTableOperate(&data->mRulesByWeight, NS_INT32_TO_PTR(weight),
PL_DHASH_ADD));
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.
PerWeightDataListItem *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::DOCUMENT_RULE == type ||
css::Rule::SUPPORTS_RULE == type) {
css::GroupRule* groupRule = static_cast<css::GroupRule*>(aRule);
if (groupRule->UseForPresentation(data->mPresContext, data->mCacheKey))
if (!groupRule->EnumerateRulesForwards(CascadeRuleEnumFunc, 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::PAGE_RULE == type) {
nsCSSPageRule* pageRule = static_cast<nsCSSPageRule*>(aRule);
if (!data->mPageRules.AppendElement(pageRule)) {
return false;
}
}
return true;
}
/* static */ bool
nsCSSRuleProcessor::CascadeSheet(nsCSSStyleSheet* aSheet, CascadeEnumData* aData)
{
if (aSheet->IsApplicable() &&
aSheet->UseForPresentation(aData->mPresContext, aData->mCacheKey) &&
aSheet->mInner) {
nsCSSStyleSheet* 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
}
struct FillWeightArrayData {
FillWeightArrayData(PerWeightData* aArrayData) :
mIndex(0),
mWeightArray(aArrayData)
{
}
int32_t mIndex;
PerWeightData* mWeightArray;
};
static PLDHashOperator
FillWeightArray(PLDHashTable *table, PLDHashEntryHdr *hdr,
uint32_t number, void *arg)
{
FillWeightArrayData* data = static_cast<FillWeightArrayData*>(arg);
const RuleByWeightEntry *entry = (const RuleByWeightEntry *)hdr;
data->mWeightArray[data->mIndex++] = entry->data;
return PL_DHASH_NEXT;
}
RuleCascadeData*
nsCSSRuleProcessor::GetRuleCascade(nsPresContext* aPresContext)
{
// 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;
}
}
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->mPageRules,
newCascade->mCacheKey,
mSheetType);
if (!data.mRulesByWeight.ops)
return; /* out of memory */
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;
nsAutoArrayPtr<PerWeightData> weightArray(new PerWeightData[weightCount]);
FillWeightArrayData fwData(weightArray);
PL_DHashTableEnumerate(&data.mRulesByWeight, FillWeightArray, &fwData);
NS_QuickSort(weightArray, 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 */
}
}
// 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)
{
while (aSelectorList) {
nsCSSSelector* sel = aSelectorList->mSelectors;
NS_ASSERTION(sel, "Should have *some* selectors");
NS_ASSERTION(!sel->IsPseudoElement(), "Shouldn't have been called");
NodeMatchContext nodeContext(nsEventStates(), false);
if (SelectorMatches(aElement, sel, nodeContext, aTreeMatchContext)) {
nsCSSSelector* next = sel->mNext;
if (!next ||
SelectorMatchesTree(aElement, next, aTreeMatchContext, false)) {
return true;
}
}
aSelectorList = aSelectorList->mNext;
}
return false;
}
// TreeMatchContext and AncestorFilter out of line methods
void
TreeMatchContext::InitAncestors(Element *aElement)
{
MOZ_ASSERT(!mAncestorFilter.mFilter);
MOZ_ASSERT(mAncestorFilter.mHashes.IsEmpty());
mAncestorFilter.mFilter = new AncestorFilter::Filter();
if (MOZ_LIKELY(aElement)) {
MOZ_ASSERT(aElement->IsInDoc(),
"aElement must be in the document for the assumption that "
"GetParentNode() is non-null on all element ancestors of "
"aElement to be true");
// Collect up the ancestors
nsAutoTArray<Element*, 50> ancestors;
Element* cur = aElement;
do {
ancestors.AppendElement(cur);
nsINode* parent = cur->GetParentNode();
if (!parent->IsElement()) {
break;
}
cur = parent->AsElement();
} while (true);
// Now push them in reverse order.
for (uint32_t i = ancestors.Length(); i-- != 0; ) {
mAncestorFilter.PushAncestor(ancestors[i]);
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->Tag()->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
{
nsINode* cur = aElement->GetParentNode();
while (cur && cur->IsElement()) {
MOZ_ASSERT(mElements.Contains(cur));
cur = cur->GetParentNode();
}
}
#endif
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