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gecko-dev/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:
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* L. David Baron <dbaron@dbaron.org>
* Daniel Glazman <glazman@netscape.com>
* Ehsan Akhgari <ehsan.akhgari@gmail.com>
* Rob Arnold <robarnold@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* style rule processor for CSS style sheets, responsible for selector
* matching and cascading
*/
#include "nsCSSRuleProcessor.h"
#include "nsRuleProcessorData.h"
#define PL_ARENA_CONST_ALIGN_MASK 7
#define NS_RULEHASH_ARENA_BLOCK_SIZE (256)
#include "plarena.h"
#include "nsCRT.h"
#include "nsIAtom.h"
#include "pldhash.h"
#include "nsHashtable.h"
#include "nsICSSPseudoComparator.h"
#include "nsCSSRuleProcessor.h"
#include "nsICSSStyleRule.h"
#include "nsICSSGroupRule.h"
#include "nsIDocument.h"
#include "nsPresContext.h"
#include "nsIEventStateManager.h"
#include "nsGkAtoms.h"
#include "nsString.h"
#include "nsUnicharUtils.h"
#include "nsDOMError.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 "nsAttrName.h"
#include "nsILookAndFeel.h"
#include "nsWidgetsCID.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 "nsIPrivateBrowsingService.h"
#include "nsNetCID.h"
#include "mozilla/Services.h"
#include "mozilla/dom/Element.h"
using namespace mozilla::dom;
#define VISITED_PSEUDO_PREF "layout.css.visited_links_enabled"
static PRBool gSupportVisitedPseudo = PR_TRUE;
static NS_DEFINE_CID(kLookAndFeelCID, NS_LOOKANDFEEL_CID);
static nsTArray< nsCOMPtr<nsIAtom> >* sSystemMetrics = 0;
/**
* A struct representing a given CSS rule and a particular selector
* from that rule's selector list.
*/
struct RuleSelectorPair {
RuleSelectorPair(nsICSSStyleRule* aRule, nsCSSSelector* aSelector)
: mRule(aRule), mSelector(aSelector) {}
nsICSSStyleRule* mRule;
nsCSSSelector* mSelector; // which of |mRule|'s selectors
};
/**
* 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 {
RuleValue(const RuleSelectorPair& aRuleSelectorPair, PRInt32 aIndex) :
RuleSelectorPair(aRuleSelectorPair),
mIndex(aIndex)
{}
PRInt32 mIndex; // High index means high weight/order.
};
// ------------------------------
// Rule hash table
//
// Uses any of the sets of ops below.
struct RuleHashTableEntry : public PLDHashEntryHdr {
nsTArray<RuleValue> mRules;
};
struct RuleHashTagTableEntry : public RuleHashTableEntry {
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 PRBool
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 PR_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 PRBool
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 PRBool
RuleHash_InitEntry(PLDHashTable *table, PLDHashEntryHdr *hdr,
const void *key)
{
RuleHashTableEntry* entry = static_cast<RuleHashTableEntry*>(hdr);
new (entry) RuleHashTableEntry();
return PR_TRUE;
}
static void
RuleHash_ClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
{
RuleHashTableEntry* entry = static_cast<RuleHashTableEntry*>(hdr);
entry->~RuleHashTableEntry();
}
static PRBool
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 PRBool
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 PR_TRUE;
}
static void
RuleHash_TagTable_ClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
{
RuleHashTagTableEntry* entry = static_cast<RuleHashTagTableEntry*>(hdr);
entry->~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 PRBool
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,
PL_DHashMoveEntryStub,
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,
PL_DHashMoveEntryStub,
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,
PL_DHashMoveEntryStub,
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,
PL_DHashMoveEntryStub,
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,
PL_DHashMoveEntryStub,
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,
PL_DHashMoveEntryStub,
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
// Enumerator callback function.
typedef void (*RuleEnumFunc)(nsICSSStyleRule* aRule,
nsCSSSelector* aSelector,
void *aData);
class RuleHash {
public:
RuleHash(PRBool aQuirksMode);
~RuleHash();
void AppendRule(const RuleSelectorPair &aRuleInfo);
void EnumerateAllRules(PRInt32 aNameSpace, nsIAtom* aTag, nsIAtom* aID,
const nsAttrValue* aClassList,
RuleEnumFunc aFunc, RuleProcessorData* aData);
PLArenaPool& Arena() { return mArena; }
protected:
typedef nsTArray<RuleValue> RuleValueList;
void AppendRuleToTable(PLDHashTable* aTable, const void* aKey,
const RuleSelectorPair& aRuleInfo);
void AppendUniversalRule(const RuleSelectorPair& aRuleInfo);
PRInt32 mRuleCount;
PLDHashTable mIdTable;
PLDHashTable mClassTable;
PLDHashTable mTagTable;
PLDHashTable mNameSpaceTable;
RuleValueList mUniversalRules;
struct EnumData {
const RuleValue* mCurValue;
const RuleValue* mEnd;
};
EnumData* mEnumList;
PRInt32 mEnumListSize;
inline EnumData ToEnumData(const RuleValueList& arr) {
EnumData data = { arr.Elements(), arr.Elements() + arr.Length() };
return data;
}
PLArenaPool mArena;
#ifdef RULE_HASH_STATS
PRUint32 mUniversalSelectors;
PRUint32 mNameSpaceSelectors;
PRUint32 mTagSelectors;
PRUint32 mClassSelectors;
PRUint32 mIdSelectors;
PRUint32 mElementsMatched;
PRUint32 mElementUniversalCalls;
PRUint32 mElementNameSpaceCalls;
PRUint32 mElementTagCalls;
PRUint32 mElementClassCalls;
PRUint32 mElementIdCalls;
#endif // RULE_HASH_STATS
};
RuleHash::RuleHash(PRBool aQuirksMode)
: mRuleCount(0),
mUniversalRules(nsnull),
mEnumList(nsnull), mEnumListSize(0)
#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);
// Initialize our arena
PL_INIT_ARENA_POOL(&mArena, "RuleHashArena", NS_RULEHASH_ARENA_BLOCK_SIZE);
PL_DHashTableInit(&mTagTable, &RuleHash_TagTable_Ops, nsnull,
sizeof(RuleHashTagTableEntry), 64);
PL_DHashTableInit(&mIdTable,
aQuirksMode ? &RuleHash_IdTable_CIOps.ops
: &RuleHash_IdTable_CSOps.ops,
nsnull, sizeof(RuleHashTableEntry), 16);
PL_DHashTableInit(&mClassTable,
aQuirksMode ? &RuleHash_ClassTable_CIOps.ops
: &RuleHash_ClassTable_CSOps.ops,
nsnull, sizeof(RuleHashTableEntry), 16);
PL_DHashTableInit(&mNameSpaceTable, &RuleHash_NameSpaceTable_Ops, nsnull,
sizeof(RuleHashTableEntry), 16);
}
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 (PRUint32 i = 0; i < mUniversalRules.Length(); ++i) {
RuleValue* value = &(mUniversalRules[i]);
nsAutoString selectorText;
PRUint32 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 (nsnull != mEnumList) {
delete [] mEnumList;
}
// delete arena for strings and small objects
PL_DHashTableFinish(&mIdTable);
PL_DHashTableFinish(&mClassTable);
PL_DHashTableFinish(&mTagTable);
PL_DHashTableFinish(&mNameSpaceTable);
PL_FinishArenaPool(&mArena);
}
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++));
}
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++));
}
void RuleHash::AppendRule(const RuleSelectorPair& aRuleInfo)
{
nsCSSSelector *selector = aRuleInfo.mSelector;
if (nsnull != selector->mIDList) {
AppendRuleToTable(&mIdTable, selector->mIDList->mAtom, aRuleInfo);
RULE_HASH_STAT_INCREMENT(mIdSelectors);
}
else if (nsnull != selector->mClassList) {
AppendRuleToTable(&mClassTable, selector->mClassList->mAtom, aRuleInfo);
RULE_HASH_STAT_INCREMENT(mClassSelectors);
}
else if (selector->mLowercaseTag) {
RuleValue ruleValue(aRuleInfo, mRuleCount++);
AppendRuleToTagTable(&mTagTable, selector->mLowercaseTag, ruleValue);
RULE_HASH_STAT_INCREMENT(mTagSelectors);
if (selector->mCasedTag &&
selector->mCasedTag != selector->mLowercaseTag) {
AppendRuleToTagTable(&mTagTable, selector->mCasedTag, ruleValue);
RULE_HASH_STAT_INCREMENT(mTagSelectors);
}
}
else if (kNameSpaceID_Unknown != selector->mNameSpace) {
AppendRuleToTable(&mNameSpaceTable,
NS_INT32_TO_PTR(selector->mNameSpace), aRuleInfo);
RULE_HASH_STAT_INCREMENT(mNameSpaceSelectors);
}
else { // universal tag selector
AppendUniversalRule(aRuleInfo);
RULE_HASH_STAT_INCREMENT(mUniversalSelectors);
}
}
// this should cover practically all cases so we don't need to reallocate
#define MIN_ENUM_LIST_SIZE 8
#ifdef RULE_HASH_STATS
#define RULE_HASH_STAT_INCREMENT_LIST_COUNT(list_, var_) \
(var_) += (list_).Length()
#else
#define RULE_HASH_STAT_INCREMENT_LIST_COUNT(list_, var_) \
PR_BEGIN_MACRO PR_END_MACRO
#endif
void RuleHash::EnumerateAllRules(PRInt32 aNameSpace, nsIAtom* aTag,
nsIAtom* aID, const nsAttrValue* aClassList,
RuleEnumFunc aFunc, RuleProcessorData* aData)
{
PRInt32 classCount = aClassList ? aClassList->GetAtomCount() : 0;
// assume 1 universal, tag, id, and namespace, rather than wasting
// time counting
PRInt32 testCount = classCount + 4;
if (mEnumListSize < testCount) {
delete [] mEnumList;
mEnumListSize = NS_MAX(testCount, MIN_ENUM_LIST_SIZE);
mEnumList = new EnumData[mEnumListSize];
}
PRInt32 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 != aNameSpace && mNameSpaceTable.entryCount) {
RuleHashTableEntry *entry = static_cast<RuleHashTableEntry*>
(PL_DHashTableOperate(&mNameSpaceTable, NS_INT32_TO_PTR(aNameSpace),
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 (aTag && mTagTable.entryCount) {
RuleHashTableEntry *entry = static_cast<RuleHashTableEntry*>
(PL_DHashTableOperate(&mTagTable, aTag, 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 (aID && mIdTable.entryCount) {
RuleHashTableEntry *entry = static_cast<RuleHashTableEntry*>
(PL_DHashTableOperate(&mIdTable, aID, 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.entryCount) {
for (PRInt32 index = 0; index < classCount; ++index) {
RuleHashTableEntry *entry = static_cast<RuleHashTableEntry*>
(PL_DHashTableOperate(&mClassTable, aClassList->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) {
// Merge the lists while there are still multiple lists to merge.
while (valueCount > 1) {
PRInt32 valueIndex = 0;
PRInt32 lowestRuleIndex = mEnumList[valueIndex].mCurValue->mIndex;
for (PRInt32 index = 1; index < valueCount; ++index) {
PRInt32 ruleIndex = mEnumList[index].mCurValue->mIndex;
if (ruleIndex < lowestRuleIndex) {
valueIndex = index;
lowestRuleIndex = ruleIndex;
}
}
const RuleValue *cur = mEnumList[valueIndex].mCurValue;
(*aFunc)(cur->mRule, cur->mSelector, aData);
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) {
(*aFunc)(value->mRule, value->mSelector, aData);
}
}
}
//--------------------------------
// Attribute selectors hash table.
struct AttributeSelectorEntry : public PLDHashEntryHdr {
nsIAtom *mAttribute;
nsTArray<nsCSSSelector*> *mSelectors;
};
static void
AttributeSelectorClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
{
AttributeSelectorEntry *entry = static_cast<AttributeSelectorEntry*>(hdr);
delete entry->mSelectors;
memset(entry, 0, table->entrySize);
}
static const PLDHashTableOps AttributeSelectorOps = {
PL_DHashAllocTable,
PL_DHashFreeTable,
PL_DHashVoidPtrKeyStub,
PL_DHashMatchEntryStub,
PL_DHashMoveEntryStub,
AttributeSelectorClearEntry,
PL_DHashFinalizeStub,
NULL
};
//--------------------------------
// Class selectors hash table.
struct ClassSelectorEntry : public PLDHashEntryHdr {
nsIAtom *mClass;
nsTArray<nsCSSSelector*> mSelectors;
};
static void
ClassSelector_ClearEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
{
(static_cast<ClassSelectorEntry*>(hdr))->~ClassSelectorEntry();
}
static PRBool
ClassSelector_InitEntry(PLDHashTable *table, PLDHashEntryHdr *hdr,
const void *key)
{
ClassSelectorEntry *entry = static_cast<ClassSelectorEntry*>(hdr);
new (entry) ClassSelectorEntry();
entry->mClass = const_cast<nsIAtom*>(static_cast<const nsIAtom*>(key));
return PR_TRUE;
}
static nsIAtom*
ClassSelector_GetKey(PLDHashTable *table, const PLDHashEntryHdr *hdr)
{
const ClassSelectorEntry *entry = static_cast<const ClassSelectorEntry*>(hdr);
return entry->mClass;
}
// Case-sensitive ops.
static const RuleHashTableOps ClassSelector_CSOps = {
{
PL_DHashAllocTable,
PL_DHashFreeTable,
PL_DHashVoidPtrKeyStub,
RuleHash_CSMatchEntry,
PL_DHashMoveEntryStub,
ClassSelector_ClearEntry,
PL_DHashFinalizeStub,
ClassSelector_InitEntry
},
ClassSelector_GetKey
};
// Case-insensitive ops.
static const RuleHashTableOps ClassSelector_CIOps = {
{
PL_DHashAllocTable,
PL_DHashFreeTable,
RuleHash_CIHashKey,
RuleHash_CIMatchEntry,
PL_DHashMoveEntryStub,
ClassSelector_ClearEntry,
PL_DHashFinalizeStub,
ClassSelector_InitEntry
},
ClassSelector_GetKey
};
//--------------------------------
struct RuleCascadeData {
RuleCascadeData(nsIAtom *aMedium, PRBool aQuirksMode)
: mRuleHash(aQuirksMode),
mStateSelectors(),
mSelectorDocumentStates(0),
mCacheKey(aMedium),
mNext(nsnull),
mQuirksMode(aQuirksMode)
{
PL_DHashTableInit(&mAttributeSelectors, &AttributeSelectorOps, nsnull,
sizeof(AttributeSelectorEntry), 16);
PL_DHashTableInit(&mAnonBoxRules, &RuleHash_TagTable_Ops, nsnull,
sizeof(RuleHashTagTableEntry), 16);
PL_DHashTableInit(&mClassSelectors,
aQuirksMode ? &ClassSelector_CIOps.ops :
&ClassSelector_CSOps.ops,
nsnull, sizeof(ClassSelectorEntry), 16);
memset(mPseudoElementRuleHashes, 0, sizeof(mPseudoElementRuleHashes));
#ifdef MOZ_XUL
PL_DHashTableInit(&mXULTreeRules, &RuleHash_TagTable_Ops, nsnull,
sizeof(RuleHashTagTableEntry), 16);
#endif
}
~RuleCascadeData()
{
PL_DHashTableFinish(&mAttributeSelectors);
PL_DHashTableFinish(&mAnonBoxRules);
PL_DHashTableFinish(&mClassSelectors);
#ifdef MOZ_XUL
PL_DHashTableFinish(&mXULTreeRules);
#endif
for (PRUint32 i = 0; i < NS_ARRAY_LENGTH(mPseudoElementRuleHashes); ++i) {
delete mPseudoElementRuleHashes[i];
}
}
RuleHash mRuleHash;
RuleHash*
mPseudoElementRuleHashes[nsCSSPseudoElements::ePseudo_PseudoElementCount];
nsTArray<nsCSSSelector*> mStateSelectors;
PRUint32 mSelectorDocumentStates;
PLDHashTable mClassSelectors;
nsTArray<nsCSSSelector*> mPossiblyNegatedClassSelectors;
nsTArray<nsCSSSelector*> mIDSelectors;
PLDHashTable mAttributeSelectors;
PLDHashTable mAnonBoxRules;
#ifdef MOZ_XUL
PLDHashTable mXULTreeRules;
#endif
nsTArray<nsFontFaceRuleContainer> mFontFaceRules;
// 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 PRBool mQuirksMode;
};
nsTArray<nsCSSSelector*>*
RuleCascadeData::AttributeListFor(nsIAtom* aAttribute)
{
AttributeSelectorEntry *entry = static_cast<AttributeSelectorEntry*>
(PL_DHashTableOperate(&mAttributeSelectors, aAttribute, PL_DHASH_ADD));
if (!entry)
return nsnull;
if (!entry->mSelectors) {
if (!(entry->mSelectors = new nsTArray<nsCSSSelector*>)) {
PL_DHashTableRawRemove(&mAttributeSelectors, entry);
return nsnull;
}
entry->mAttribute = aAttribute;
}
return entry->mSelectors;
}
class nsPrivateBrowsingObserver : nsIObserver,
nsSupportsWeakReference
{
public:
nsPrivateBrowsingObserver();
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
void Init();
PRBool InPrivateBrowsing() const { return mInPrivateBrowsing; }
private:
PRBool mInPrivateBrowsing;
};
NS_IMPL_ISUPPORTS2(nsPrivateBrowsingObserver, nsIObserver, nsISupportsWeakReference)
nsPrivateBrowsingObserver::nsPrivateBrowsingObserver()
: mInPrivateBrowsing(PR_FALSE)
{
}
void
nsPrivateBrowsingObserver::Init()
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->AddObserver(this, "profile-after-change", PR_TRUE);
observerService->AddObserver(this, NS_PRIVATE_BROWSING_SWITCH_TOPIC, PR_TRUE);
}
}
nsresult
nsPrivateBrowsingObserver::Observe(nsISupports *aSubject,
const char *aTopic,
const PRUnichar *aData)
{
if (!strcmp(aTopic, NS_PRIVATE_BROWSING_SWITCH_TOPIC)) {
if (!nsCRT::strcmp(aData, NS_LITERAL_STRING(NS_PRIVATE_BROWSING_ENTER).get())) {
mInPrivateBrowsing = PR_TRUE;
} else {
mInPrivateBrowsing = PR_FALSE;
}
}
else if (!strcmp(aTopic, "profile-after-change")) {
nsCOMPtr<nsIPrivateBrowsingService> pbService =
do_GetService(NS_PRIVATE_BROWSING_SERVICE_CONTRACTID);
if (pbService)
pbService->GetPrivateBrowsingEnabled(&mInPrivateBrowsing);
}
return NS_OK;
}
static nsPrivateBrowsingObserver *gPrivateBrowsingObserver = nsnull;
// -------------------------------
// CSS Style rule processor implementation
//
nsCSSRuleProcessor::nsCSSRuleProcessor(const sheet_array_type& aSheets,
PRUint8 aSheetType)
: mSheets(aSheets)
, mRuleCascades(nsnull)
, mLastPresContext(nsnull)
, mSheetType(aSheetType)
{
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()
{
nsContentUtils::AddBoolPrefVarCache(VISITED_PSEUDO_PREF,
&gSupportVisitedPseudo);
// We want to default to true, not false as AddBoolPrefVarCache does.
gSupportVisitedPseudo =
nsContentUtils::GetBoolPref(VISITED_PSEUDO_PREF, PR_TRUE);
gPrivateBrowsingObserver = new nsPrivateBrowsingObserver();
NS_ENSURE_TRUE(gPrivateBrowsingObserver, NS_ERROR_OUT_OF_MEMORY);
NS_ADDREF(gPrivateBrowsingObserver);
gPrivateBrowsingObserver->Init();
return NS_OK;
}
static PRBool
InitSystemMetrics()
{
NS_ASSERTION(!sSystemMetrics, "already initialized");
sSystemMetrics = new nsTArray< nsCOMPtr<nsIAtom> >;
NS_ENSURE_TRUE(sSystemMetrics, PR_FALSE);
nsresult rv;
nsCOMPtr<nsILookAndFeel> lookAndFeel(do_GetService(kLookAndFeelCID, &rv));
NS_ENSURE_SUCCESS(rv, PR_FALSE);
/***************************************************************************
* ANY METRICS ADDED HERE SHOULD ALSO BE ADDED AS MEDIA QUERIES IN *
* nsMediaFeatures.cpp *
***************************************************************************/
PRInt32 metricResult;
lookAndFeel->GetMetric(nsILookAndFeel::eMetric_ScrollArrowStyle, metricResult);
if (metricResult & nsILookAndFeel::eMetric_ScrollArrowStartBackward) {
sSystemMetrics->AppendElement(nsGkAtoms::scrollbar_start_backward);
}
if (metricResult & nsILookAndFeel::eMetric_ScrollArrowStartForward) {
sSystemMetrics->AppendElement(nsGkAtoms::scrollbar_start_forward);
}
if (metricResult & nsILookAndFeel::eMetric_ScrollArrowEndBackward) {
sSystemMetrics->AppendElement(nsGkAtoms::scrollbar_end_backward);
}
if (metricResult & nsILookAndFeel::eMetric_ScrollArrowEndForward) {
sSystemMetrics->AppendElement(nsGkAtoms::scrollbar_end_forward);
}
lookAndFeel->GetMetric(nsILookAndFeel::eMetric_ScrollSliderStyle, metricResult);
if (metricResult != nsILookAndFeel::eMetric_ScrollThumbStyleNormal) {
sSystemMetrics->AppendElement(nsGkAtoms::scrollbar_thumb_proportional);
}
lookAndFeel->GetMetric(nsILookAndFeel::eMetric_ImagesInMenus, metricResult);
if (metricResult) {
sSystemMetrics->AppendElement(nsGkAtoms::images_in_menus);
}
lookAndFeel->GetMetric(nsILookAndFeel::eMetric_ImagesInButtons, metricResult);
if (metricResult) {
sSystemMetrics->AppendElement(nsGkAtoms::images_in_buttons);
}
lookAndFeel->GetMetric(nsILookAndFeel::eMetric_MenuBarDrag, metricResult);
if (metricResult) {
sSystemMetrics->AppendElement(nsGkAtoms::menubar_drag);
}
rv = lookAndFeel->GetMetric(nsILookAndFeel::eMetric_WindowsDefaultTheme, metricResult);
if (NS_SUCCEEDED(rv) && metricResult) {
sSystemMetrics->AppendElement(nsGkAtoms::windows_default_theme);
}
rv = lookAndFeel->GetMetric(nsILookAndFeel::eMetric_MacGraphiteTheme, metricResult);
if (NS_SUCCEEDED(rv) && metricResult) {
sSystemMetrics->AppendElement(nsGkAtoms::mac_graphite_theme);
}
rv = lookAndFeel->GetMetric(nsILookAndFeel::eMetric_DWMCompositor, metricResult);
if (NS_SUCCEEDED(rv) && metricResult) {
sSystemMetrics->AppendElement(nsGkAtoms::windows_compositor);
}
rv = lookAndFeel->GetMetric(nsILookAndFeel::eMetric_WindowsClassic, metricResult);
if (NS_SUCCEEDED(rv) && metricResult) {
sSystemMetrics->AppendElement(nsGkAtoms::windows_classic);
}
rv = lookAndFeel->GetMetric(nsILookAndFeel::eMetric_TouchEnabled, metricResult);
if (NS_SUCCEEDED(rv) && metricResult) {
sSystemMetrics->AppendElement(nsGkAtoms::touch_enabled);
}
rv = lookAndFeel->GetMetric(nsILookAndFeel::eMetric_MaemoClassic, metricResult);
if (NS_SUCCEEDED(rv) && metricResult) {
sSystemMetrics->AppendElement(nsGkAtoms::maemo_classic);
}
return PR_TRUE;
}
/* static */ void
nsCSSRuleProcessor::FreeSystemMetrics()
{
delete sSystemMetrics;
sSystemMetrics = nsnull;
}
/* static */ void
nsCSSRuleProcessor::Shutdown()
{
FreeSystemMetrics();
// Make sure we don't crash if Shutdown is called before Init
NS_IF_RELEASE(gPrivateBrowsingObserver);
}
/* static */ PRBool
nsCSSRuleProcessor::HasSystemMetric(nsIAtom* aMetric)
{
if (!sSystemMetrics && !InitSystemMetrics()) {
return PR_FALSE;
}
return sSystemMetrics->IndexOf(aMetric) != sSystemMetrics->NoIndex;
}
RuleProcessorData::RuleProcessorData(nsPresContext* aPresContext,
Element* aElement,
nsRuleWalker* aRuleWalker,
nsCompatibility* aCompat /*= nsnull*/)
: mPresContext(aPresContext),
mElement(aElement),
mRuleWalker(aRuleWalker),
mScopedRoot(nsnull),
mPreviousSiblingData(nsnull),
mParentData(nsnull),
mLanguage(nsnull),
mGotContentState(PR_FALSE)
{
MOZ_COUNT_CTOR(RuleProcessorData);
NS_ASSERTION(aElement, "null element leaked into SelectorMatches");
mNthIndices[0][0] = -2;
mNthIndices[0][1] = -2;
mNthIndices[1][0] = -2;
mNthIndices[1][1] = -2;
// get the compat. mode (unless it is provided)
// XXXbz is passing in the compat mode really that much of an optimization?
if (aCompat) {
mCompatMode = *aCompat;
} else if (NS_LIKELY(mPresContext)) {
mCompatMode = mPresContext->CompatibilityMode();
} else {
NS_ASSERTION(aElement->GetOwnerDoc(), "Must have document");
mCompatMode = aElement->GetOwnerDoc()->GetCompatibilityMode();
}
NS_ASSERTION(aElement->GetOwnerDoc(), "Document-less node here?");
// get the tag and parent
mContentTag = aElement->Tag();
mParentContent = aElement->GetParent();
// see if there are attributes for the content
mHasAttributes = aElement->GetAttrCount() > 0;
if (mHasAttributes) {
// get the ID and classes for the content
mContentID = aElement->GetID();
mClasses = aElement->GetClasses();
} else {
mContentID = nsnull;
mClasses = nsnull;
}
// get the namespace
mNameSpaceID = aElement->GetNameSpaceID();
// check for HTMLContent status
mIsHTMLContent = (mNameSpaceID == kNameSpaceID_XHTML);
mIsHTML = mIsHTMLContent && aElement->IsInHTMLDocument();
// No need to initialize mContentState; the ContentState() accessor will handle
// that.
}
RuleProcessorData::~RuleProcessorData()
{
MOZ_COUNT_DTOR(RuleProcessorData);
// Destroy potentially long chains of previous sibling and parent data
// without more than one level of recursion.
if (mPreviousSiblingData || mParentData) {
nsAutoVoidArray destroyQueue;
destroyQueue.AppendElement(this);
do {
RuleProcessorData *d = static_cast<RuleProcessorData*>
(destroyQueue.FastElementAt(destroyQueue.Count() - 1));
destroyQueue.RemoveElementAt(destroyQueue.Count() - 1);
if (d->mPreviousSiblingData) {
destroyQueue.AppendElement(d->mPreviousSiblingData);
d->mPreviousSiblingData = nsnull;
}
if (d->mParentData) {
destroyQueue.AppendElement(d->mParentData);
d->mParentData = nsnull;
}
if (d != this)
d->Destroy();
} while (destroyQueue.Count());
}
delete mLanguage;
}
const nsString* RuleProcessorData::GetLang()
{
if (!mLanguage) {
mLanguage = new nsString();
if (!mLanguage)
return nsnull;
for (nsIContent* content = mElement; content;
content = content->GetParent()) {
if (content->GetAttrCount() > 0) {
// xml:lang has precedence over lang on HTML elements (see
// XHTML1 section C.7).
PRBool hasAttr = content->GetAttr(kNameSpaceID_XML, nsGkAtoms::lang,
*mLanguage);
if (!hasAttr && content->IsHTML()) {
hasAttr = content->GetAttr(kNameSpaceID_None, nsGkAtoms::lang,
*mLanguage);
}
NS_ASSERTION(hasAttr || mLanguage->IsEmpty(),
"GetAttr that returns false should not make string non-empty");
if (hasAttr) {
break;
}
}
}
}
return mLanguage;
}
PRUint32
RuleProcessorData::ContentState()
{
if (!mGotContentState) {
mGotContentState = PR_TRUE;
mContentState = mPresContext ?
mPresContext->EventStateManager()->GetContentState(mElement) :
mElement->IntrinsicState();
// 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 ((!gSupportVisitedPseudo ||
gPrivateBrowsingObserver->InPrivateBrowsing()) &&
(mContentState & NS_EVENT_STATE_VISITED)) {
mContentState = (mContentState & ~PRUint32(NS_EVENT_STATE_VISITED)) |
NS_EVENT_STATE_UNVISITED;
}
}
return mContentState;
}
PRUint32
RuleProcessorData::DocumentState()
{
return mElement->GetOwnerDoc()->GetDocumentState();
}
PRBool
RuleProcessorData::IsLink()
{
PRUint32 state = ContentState();
return (state & (NS_EVENT_STATE_VISITED | NS_EVENT_STATE_UNVISITED)) != 0;
}
PRUint32
RuleProcessorData::GetContentStateForVisitedHandling(
nsRuleWalker::VisitedHandlingType aVisitedHandling,
PRBool aIsRelevantLink)
{
PRUint32 contentState = ContentState();
if (contentState & (NS_EVENT_STATE_VISITED | NS_EVENT_STATE_UNVISITED)) {
NS_ABORT_IF_FALSE(IsLink(), "IsLink() should match state");
contentState &=
~PRUint32(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;
}
PRInt32
RuleProcessorData::GetNthIndex(PRBool aIsOfType, PRBool aIsFromEnd,
PRBool aCheckEdgeOnly)
{
NS_ASSERTION(mParentContent, "caller should check mParentContent");
PRInt32 &slot = mNthIndices[aIsOfType][aIsFromEnd];
if (slot != -2 && (slot != -1 || aCheckEdgeOnly))
return slot;
if (mPreviousSiblingData &&
(!aIsOfType ||
(mPreviousSiblingData->mNameSpaceID == mNameSpaceID &&
mPreviousSiblingData->mContentTag == mContentTag))) {
slot = mPreviousSiblingData->mNthIndices[aIsOfType][aIsFromEnd];
if (slot > 0) {
slot += (aIsFromEnd ? -1 : 1);
NS_ASSERTION(slot > 0, "How did that happen?");
return slot;
}
}
PRInt32 result = 1;
nsIContent* parent = mParentContent;
PRUint32 childCount;
nsIContent * const * curChildPtr = parent->GetChildArray(&childCount);
#ifdef DEBUG
nsMutationGuard debugMutationGuard;
#endif
PRInt32 increment;
nsIContent * const * stopPtr;
if (aIsFromEnd) {
stopPtr = curChildPtr - 1;
curChildPtr = stopPtr + childCount;
increment = -1;
} else {
increment = 1;
stopPtr = curChildPtr + childCount;
}
for ( ; ; curChildPtr += increment) {
if (curChildPtr == stopPtr) {
// mContent is the root of an anonymous content subtree.
result = 0; // special value to indicate that it is not at any index
break;
}
nsIContent* child = *curChildPtr;
if (child == mElement)
break;
if (child->IsElement() &&
(!aIsOfType ||
(child->Tag() == mContentTag &&
child->GetNameSpaceID() == mNameSpaceID))) {
if (aCheckEdgeOnly) {
// The caller only cares whether or not the result is 1, and we
// now know it's not.
result = -1;
break;
}
++result;
}
}
#ifdef DEBUG
NS_ASSERTION(!debugMutationGuard.Mutated(0), "Unexpected mutations happened");
#endif
slot = result;
return result;
}
/**
* A |TreeMatchContext| has data about matching a selector (containing
* combinators) against a node and the tree that that node is in. It
* contains both input to and output from the matching.
*/
struct TreeMatchContext {
// Is this matching operation for the creation of a style context?
// (If it is, we need to set slow selector bits on nodes indicating
// that certain restyling needs to happen.)
const PRBool mForStyling;
// Did this matching operation find a relevant link? (If so, we'll
// need to construct a StyleIfVisited.)
PRBool mHaveRelevantLink;
nsRuleWalker::VisitedHandlingType mVisitedHandling;
TreeMatchContext(PRBool aForStyling,
nsRuleWalker::VisitedHandlingType aVisitedHandling)
: mForStyling(aForStyling)
, mHaveRelevantLink(PR_FALSE)
, mVisitedHandling(aVisitedHandling)
{
}
};
/**
* 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 |aStateMask| 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 PRInt32 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 PRBool mIsRelevantLink;
NodeMatchContext(PRInt32 aStateMask, PRBool aIsRelevantLink)
: mStateMask(aStateMask)
, mIsRelevantLink(aIsRelevantLink)
{
}
};
static PRBool 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 PR_TRUE;
++p; // we know the next character is not whitespace
}
return PR_FALSE;
}
// Return whether we should apply a "global" (i.e., universal-tag)
// selector for event states in quirks mode. Note that
// |data.IsLink()| is checked separately by the caller, so we return
// false for |nsGkAtoms::a|, which here means a named anchor.
inline PRBool IsQuirkEventSensitive(nsIAtom *aContentTag)
{
return PRBool ((nsGkAtoms::button == aContentTag) ||
(nsGkAtoms::img == aContentTag) ||
(nsGkAtoms::input == aContentTag) ||
(nsGkAtoms::label == aContentTag) ||
(nsGkAtoms::select == aContentTag) ||
(nsGkAtoms::textarea == aContentTag));
}
static inline PRBool
IsSignificantChild(nsIContent* aChild, PRBool aTextIsSignificant,
PRBool 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 PRBool AttrMatchesValue(const nsAttrSelector* aAttrSelector,
const nsString& aValue, PRBool 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 PR_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 PR_FALSE;
}
}
static inline PRBool
edgeChildMatches(RuleProcessorData& data, TreeMatchContext& aTreeMatchContext,
PRBool checkFirst, PRBool checkLast)
{
nsIContent *parent = data.mParentContent;
if (!parent) {
return PR_FALSE;
}
if (aTreeMatchContext.mForStyling)
parent->SetFlags(NODE_HAS_EDGE_CHILD_SELECTOR);
return (!checkFirst ||
data.GetNthIndex(PR_FALSE, PR_FALSE, PR_TRUE) == 1) &&
(!checkLast ||
data.GetNthIndex(PR_FALSE, PR_TRUE, PR_TRUE) == 1);
}
static inline PRBool
nthChildGenericMatches(RuleProcessorData& data,
TreeMatchContext& aTreeMatchContext,
nsPseudoClassList* pseudoClass,
PRBool isOfType, PRBool isFromEnd)
{
nsIContent *parent = data.mParentContent;
if (!parent) {
return PR_FALSE;
}
if (aTreeMatchContext.mForStyling) {
if (isFromEnd)
parent->SetFlags(NODE_HAS_SLOW_SELECTOR);
else
parent->SetFlags(NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS);
}
const PRInt32 index = data.GetNthIndex(isOfType, isFromEnd, PR_FALSE);
if (index <= 0) {
// Node is anonymous content (not really a child of its parent).
return PR_FALSE;
}
const PRInt32 a = pseudoClass->u.mNumbers[0];
const PRInt32 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 PRInt32 n = (index - b) / a;
return n >= 0 && (a * n == index - b);
}
static inline PRBool
edgeOfTypeMatches(RuleProcessorData& data, TreeMatchContext& aTreeMatchContext,
PRBool checkFirst, PRBool checkLast)
{
nsIContent *parent = data.mParentContent;
if (!parent) {
return PR_FALSE;
}
if (aTreeMatchContext.mForStyling) {
if (checkLast)
parent->SetFlags(NODE_HAS_SLOW_SELECTOR);
else
parent->SetFlags(NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS);
}
return (!checkFirst ||
data.GetNthIndex(PR_TRUE, PR_FALSE, PR_TRUE) == 1) &&
(!checkLast ||
data.GetNthIndex(PR_TRUE, PR_TRUE, PR_TRUE) == 1);
}
static inline PRBool
checkGenericEmptyMatches(RuleProcessorData& data,
TreeMatchContext& aTreeMatchContext,
PRBool isWhitespaceSignificant)
{
nsIContent *child = nsnull;
Element *element = data.mElement;
PRInt32 index = -1;
if (aTreeMatchContext.mForStyling)
element->SetFlags(NODE_HAS_EMPTY_SELECTOR);
do {
child = element->GetChildAt(++index);
// stop at first non-comment (and non-whitespace for
// :-moz-only-whitespace) node
} while (child && !IsSignificantChild(child, PR_TRUE, isWhitespaceSignificant));
return (child == nsnull);
}
// An array of the bits that are relevant for various pseudoclasses.
static const PRUint32 sPseudoClassBits[] = {
#define CSS_PSEUDO_CLASS(_name, _value) \
0,
#define CSS_STATE_PSEUDO_CLASS(_name, _value, _bit) \
_bit,
#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.
0,
0
};
PR_STATIC_ASSERT(NS_ARRAY_LENGTH(sPseudoClassBits) ==
nsCSSPseudoClasses::ePseudoClass_NotPseudoClass + 1);
// |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 aStateMask
static PRBool SelectorMatches(RuleProcessorData &data,
nsCSSSelector* aSelector,
NodeMatchContext& aNodeMatchContext,
TreeMatchContext& aTreeMatchContext,
PRBool* const aDependence = nsnull)
{
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 &&
data.mNameSpaceID != aSelector->mNameSpace))
return PR_FALSE;
if (aSelector->mLowercaseTag &&
(data.mIsHTML ? aSelector->mLowercaseTag : aSelector->mCasedTag) !=
data.mContentTag) {
return PR_FALSE;
}
nsAtomList* IDList = aSelector->mIDList;
if (IDList) {
if (data.mContentID) {
// case sensitivity: bug 93371
const PRBool isCaseSensitive =
data.mCompatMode != eCompatibility_NavQuirks;
if (isCaseSensitive) {
do {
if (IDList->mAtom != data.mContentID) {
return PR_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(data.mContentID);
do {
if (!nsContentUtils::EqualsIgnoreASCIICase(id1Str,
nsDependentAtomString(IDList->mAtom))) {
return PR_FALSE;
}
IDList = IDList->mNext;
} while (IDList);
}
} else {
// Element has no id but we have an id selector
return PR_FALSE;
}
}
nsAtomList* classList = aSelector->mClassList;
if (classList) {
// test for class match
const nsAttrValue *elementClasses = data.mClasses;
if (!elementClasses) {
// Element has no classes but we have a class selector
return PR_FALSE;
}
// case sensitivity: bug 93371
const PRBool isCaseSensitive =
data.mCompatMode != eCompatibility_NavQuirks;
while (classList) {
if (!elementClasses->Contains(classList->mAtom,
isCaseSensitive ?
eCaseMatters : eIgnoreCase)) {
return PR_FALSE;
}
classList = classList->mNext;
}
}
const PRBool isNegated = (aDependence != nsnull);
// 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 == 0 ||
!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) {
PRInt32 statesToCheck = sPseudoClassBits[pseudoClass->mType];
if (!statesToCheck) {
// keep the cases here in the same order as the list in
// nsCSSPseudoClassList.h
switch (pseudoClass->mType) {
case nsCSSPseudoClasses::ePseudoClass_empty:
if (!checkGenericEmptyMatches(data, aTreeMatchContext, PR_TRUE)) {
return PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozOnlyWhitespace:
if (!checkGenericEmptyMatches(data, aTreeMatchContext, PR_FALSE)) {
return PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozEmptyExceptChildrenWithLocalname:
{
NS_ASSERTION(pseudoClass->u.mString, "Must have string!");
nsIContent *child = nsnull;
Element *element = data.mElement;
PRInt32 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).
element->SetFlags(NODE_HAS_SLOW_SELECTOR);
do {
child = element->GetChildAt(++index);
} while (child &&
(!IsSignificantChild(child, PR_TRUE, PR_FALSE) ||
(child->GetNameSpaceID() == element->GetNameSpaceID() &&
child->Tag()->Equals(nsDependentString(pseudoClass->u.mString)))));
if (child != nsnull) {
return PR_FALSE;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_lang:
{
NS_ASSERTION(nsnull != pseudoClass->u.mString, "null lang parameter");
if (!pseudoClass->u.mString || !*pseudoClass->u.mString) {
return PR_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.
const nsString* lang = data.GetLang();
if (lang && !lang->IsEmpty()) { // null check for out-of-memory
if (!nsStyleUtil::DashMatchCompare(*lang,
nsDependentString(pseudoClass->u.mString),
nsASCIICaseInsensitiveStringComparator())) {
return PR_FALSE;
}
// This pseudo-class matched; move on to the next thing
break;
}
nsIDocument* doc = data.mElement->GetDocument();
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.
nsAutoString language;
doc->GetContentLanguage(language);
nsDependentString langString(pseudoClass->u.mString);
language.StripWhitespace();
PRInt32 begin = 0;
PRInt32 len = language.Length();
while (begin < len) {
PRInt32 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 PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozBoundElement:
if (data.mScopedRoot != data.mElement) {
return PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_root:
if (data.mParentContent != nsnull ||
data.mElement != data.mElement->GetOwnerDoc()->GetRootElement()) {
return PR_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(data, s, aNodeMatchContext, aTreeMatchContext)) {
break;
}
}
if (!l) {
return PR_FALSE;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_firstChild:
if (!edgeChildMatches(data, aTreeMatchContext, PR_TRUE, PR_FALSE)) {
return PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_firstNode:
{
nsIContent *firstNode = nsnull;
nsIContent *parent = data.mParentContent;
if (parent) {
if (aTreeMatchContext.mForStyling)
parent->SetFlags(NODE_HAS_EDGE_CHILD_SELECTOR);
PRInt32 index = -1;
do {
firstNode = parent->GetChildAt(++index);
// stop at first non-comment and non-whitespace node
} while (firstNode &&
!IsSignificantChild(firstNode, PR_TRUE, PR_FALSE));
}
if (data.mElement != firstNode) {
return PR_FALSE;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_lastChild:
if (!edgeChildMatches(data, aTreeMatchContext, PR_FALSE, PR_TRUE)) {
return PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_lastNode:
{
nsIContent *lastNode = nsnull;
nsIContent *parent = data.mParentContent;
if (parent) {
if (aTreeMatchContext.mForStyling)
parent->SetFlags(NODE_HAS_EDGE_CHILD_SELECTOR);
PRUint32 index = parent->GetChildCount();
do {
lastNode = parent->GetChildAt(--index);
// stop at first non-comment and non-whitespace node
} while (lastNode &&
!IsSignificantChild(lastNode, PR_TRUE, PR_FALSE));
}
if (data.mElement != lastNode) {
return PR_FALSE;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_onlyChild:
if (!edgeChildMatches(data, aTreeMatchContext, PR_TRUE, PR_TRUE)) {
return PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_firstOfType:
if (!edgeOfTypeMatches(data, aTreeMatchContext, PR_TRUE, PR_FALSE)) {
return PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_lastOfType:
if (!edgeOfTypeMatches(data, aTreeMatchContext, PR_FALSE, PR_TRUE)) {
return PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_onlyOfType:
if (!edgeOfTypeMatches(data, aTreeMatchContext, PR_TRUE, PR_TRUE)) {
return PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_nthChild:
if (!nthChildGenericMatches(data, aTreeMatchContext, pseudoClass,
PR_FALSE, PR_FALSE)) {
return PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_nthLastChild:
if (!nthChildGenericMatches(data, aTreeMatchContext, pseudoClass,
PR_FALSE, PR_TRUE)) {
return PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_nthOfType:
if (!nthChildGenericMatches(data, aTreeMatchContext, pseudoClass,
PR_TRUE, PR_FALSE)) {
return PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_nthLastOfType:
if (!nthChildGenericMatches(data, aTreeMatchContext, pseudoClass,
PR_TRUE, PR_TRUE)) {
return PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozHasHandlerRef:
{
nsIContent *child = nsnull;
Element *element = data.mElement;
PRInt32 index = -1;
do {
child = element->GetChildAt(++index);
if (child && child->IsHTML() &&
child->Tag() == nsGkAtoms::param &&
child->AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
NS_LITERAL_STRING("pluginurl"),
eIgnoreCase)) {
break;
}
} while (child);
if (!child) {
return PR_FALSE;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozIsHTML:
if (!data.mIsHTML) {
return PR_FALSE;
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozSystemMetric:
{
nsCOMPtr<nsIAtom> metric = do_GetAtom(pseudoClass->u.mString);
if (!nsCSSRuleProcessor::HasSystemMetric(metric)) {
return PR_FALSE;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozLocaleDir:
{
PRBool docIsRTL =
(data.DocumentState() & NS_DOCUMENT_STATE_RTL_LOCALE) != 0;
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 PR_FALSE;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozLWTheme:
{
nsIDocument* doc = data.mElement->GetOwnerDoc();
if (!doc ||
doc->GetDocumentLWTheme() <= nsIDocument::Doc_Theme_None) {
return PR_FALSE;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozLWThemeBrightText:
{
nsIDocument* doc = data.mElement->GetOwnerDoc();
if (!doc ||
doc->GetDocumentLWTheme() != nsIDocument::Doc_Theme_Bright) {
return PR_FALSE;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozLWThemeDarkText:
{
nsIDocument* doc = data.mElement->GetOwnerDoc();
if (!doc ||
doc->GetDocumentLWTheme() != nsIDocument::Doc_Theme_Dark) {
return PR_FALSE;
}
}
break;
case nsCSSPseudoClasses::ePseudoClass_mozWindowInactive:
if ((data.DocumentState() & NS_DOCUMENT_STATE_WINDOW_INACTIVE) == 0) {
return PR_FALSE;
}
break;
default:
NS_ABORT_IF_FALSE(PR_FALSE, "How did that happen?");
}
} else {
// Bit-based pseudo-classes
if ((statesToCheck & (NS_EVENT_STATE_HOVER | NS_EVENT_STATE_ACTIVE)) &&
data.mCompatMode == eCompatibility_NavQuirks &&
// global selector (but don't check .class):
!aSelector->HasTagSelector() && !aSelector->mIDList &&
!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|:
data.mIsHTMLContent && !data.IsLink() &&
!IsQuirkEventSensitive(data.mContentTag)) {
// In quirks mode, only make certain elements sensitive to
// selectors ":hover" and ":active".
return PR_FALSE;
} else {
if (aNodeMatchContext.mStateMask & statesToCheck) {
if (aDependence)
*aDependence = PR_TRUE;
} else {
PRUint32 contentState = data.GetContentStateForVisitedHandling(
aTreeMatchContext.mVisitedHandling,
aNodeMatchContext.mIsRelevantLink);
if (!(contentState & statesToCheck)) {
return PR_FALSE;
}
}
}
}
}
PRBool result = PR_TRUE;
if (aSelector->mAttrList) {
// test for attribute match
if (!data.mHasAttributes) {
// if no attributes on the content, no match
return PR_FALSE;
} else {
result = PR_TRUE;
nsAttrSelector* attr = aSelector->mAttrList;
nsIAtom* matchAttribute;
do {
matchAttribute = data.mIsHTML ? 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.
PRUint32 attrCount = data.mElement->GetAttrCount();
result = PR_FALSE;
for (PRUint32 i = 0; i < attrCount; ++i) {
const nsAttrName* attrName =
data.mElement->GetAttrNameAt(i);
NS_ASSERTION(attrName, "GetAttrCount lied or GetAttrNameAt failed");
if (attrName->LocalName() != matchAttribute) {
continue;
}
if (attr->mFunction == NS_ATTR_FUNC_SET) {
result = PR_TRUE;
} else {
nsAutoString value;
#ifdef DEBUG
PRBool hasAttr =
#endif
data.mElement->GetAttr(attrName->NamespaceID(),
attrName->LocalName(), value);
NS_ASSERTION(hasAttr, "GetAttrNameAt lied");
result = AttrMatchesValue(attr, value, data.mIsHTML);
}
// At this point |result| has been set by us
// explicitly in this loop. If it's PR_FALSE, we may still match
// -- the content may have another attribute with the same name but
// in a different namespace. But if it's PR_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 =
data.mElement->
AttrValueIs(attr->mNameSpace, matchAttribute, attr->mValue,
(!data.mIsHTML || attr->mCaseSensitive) ? eCaseMatters
: eIgnoreCase);
}
else if (!data.mElement->HasAttr(attr->mNameSpace, matchAttribute)) {
result = PR_FALSE;
}
else if (attr->mFunction != NS_ATTR_FUNC_SET) {
nsAutoString value;
#ifdef DEBUG
PRBool hasAttr =
#endif
data.mElement->GetAttr(attr->mNameSpace, matchAttribute, value);
NS_ASSERTION(hasAttr, "HasAttr lied");
result = AttrMatchesValue(attr, value, data.mIsHTML);
}
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) {
PRBool dependence = PR_FALSE;
result = !SelectorMatches(data, negation, aNodeMatchContext,
aTreeMatchContext, &dependence);
// If the selector does match due to the dependence on aStateMask,
// 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 PRBool SelectorMatchesTree(RuleProcessorData& aPrevData,
nsCSSSelector* aSelector,
TreeMatchContext& aTreeMatchContext,
PRBool aLookForRelevantLink)
{
nsCSSSelector* selector = aSelector;
RuleProcessorData* prevdata = &aPrevData;
while (selector) { // check compound selectors
NS_ASSERTION(!selector->mNext ||
selector->mNext->mOperator != PRUnichar(0),
"compound selector without combinator");
// If we don't already have a RuleProcessorData for the next
// appropriate content (whether parent or previous sibling), create
// one.
// for adjacent sibling combinators, the content to test against the
// selector is the previous sibling *element*
RuleProcessorData* data;
if (PRUnichar('+') == selector->mOperator ||
PRUnichar('~') == selector->mOperator) {
// The relevant link must be an ancestor of the node being matched.
aLookForRelevantLink = PR_FALSE;
data = prevdata->mPreviousSiblingData;
if (!data) {
nsIContent* parent = prevdata->mParentContent;
if (parent) {
if (aTreeMatchContext.mForStyling)
parent->SetFlags(NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS);
PRInt32 index = parent->IndexOf(prevdata->mElement);
while (0 <= --index) {
nsIContent* content = parent->GetChildAt(index);
if (content->IsElement()) {
data = RuleProcessorData::Create(prevdata->mPresContext,
content->AsElement(),
prevdata->mRuleWalker,
prevdata->mCompatMode);
prevdata->mPreviousSiblingData = data;
break;
}
}
}
}
}
// for descendant combinators and child combinators, the content
// to test against is the parent
else {
data = prevdata->mParentData;
if (!data) {
nsIContent *content = prevdata->mParentContent;
// GetParent could return a document fragment; we only want
// element parents.
if (content && content->IsElement()) {
data = RuleProcessorData::Create(prevdata->mPresContext,
content->AsElement(),
prevdata->mRuleWalker,
prevdata->mCompatMode);
prevdata->mParentData = data;
}
}
}
if (! data) {
return PR_FALSE;
}
NodeMatchContext nodeContext(0, aLookForRelevantLink && data->IsLink());
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 = PR_FALSE;
aTreeMatchContext.mHaveRelevantLink = PR_TRUE;
}
if (SelectorMatches(*data, 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 == '~' &&
(selector->mNext->mOperator == PRUnichar(' ') ||
selector->mNext->mOperator == PRUnichar('>')))) {
// 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(*data, selector, aTreeMatchContext,
aLookForRelevantLink)) {
return PR_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 PR_FALSE; // parent was required to match
}
}
prevdata = data;
}
return PR_TRUE; // all the selectors matched.
}
static void ContentEnumFunc(nsICSSStyleRule* aRule, nsCSSSelector* aSelector,
void* aData)
{
RuleProcessorData* data = (RuleProcessorData*)aData;
TreeMatchContext treeContext(PR_TRUE, data->mRuleWalker->VisitedHandling());
NodeMatchContext nodeContext(0, data->IsLink());
if (nodeContext.mIsRelevantLink) {
treeContext.mHaveRelevantLink = PR_TRUE;
}
if (SelectorMatches(*data, aSelector, nodeContext, treeContext)) {
nsCSSSelector *next = aSelector->mNext;
if (!next || SelectorMatchesTree(*data, next, treeContext,
!nodeContext.mIsRelevantLink)) {
// for performance, require that every implementation of
// nsICSSStyleRule return the same pointer for nsIStyleRule (why
// would anything multiply inherit nsIStyleRule anyway?)
#ifdef DEBUG
nsCOMPtr<nsIStyleRule> iRule = do_QueryInterface(aRule);
NS_ASSERTION(static_cast<nsIStyleRule*>(aRule) == iRule.get(),
"Please fix QI so this performance optimization is valid");
#endif
aRule->RuleMatched();
data->mRuleWalker->Forward(static_cast<nsIStyleRule*>(aRule));
// nsStyleSet will deal with the !important rule
}
}
if (treeContext.mHaveRelevantLink) {
data->mRuleWalker->SetHaveRelevantLink();
}
}
/* virtual */ void
nsCSSRuleProcessor::RulesMatching(ElementRuleProcessorData *aData)
{
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
if (cascade) {
cascade->mRuleHash.EnumerateAllRules(aData->mNameSpaceID,
aData->mContentTag,
aData->mContentID,
aData->mClasses,
ContentEnumFunc,
aData);
}
}
/* virtual */ void
nsCSSRuleProcessor::RulesMatching(PseudoElementRuleProcessorData* aData)
{
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
if (cascade) {
RuleHash* ruleHash = cascade->mPseudoElementRuleHashes[aData->mPseudoType];
if (ruleHash) {
ruleHash->EnumerateAllRules(aData->mNameSpaceID,
aData->mContentTag,
aData->mContentID,
aData->mClasses,
ContentEnumFunc,
aData);
}
}
}
/* 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) {
// for performance, require that every implementation of
// nsICSSStyleRule return the same pointer for nsIStyleRule (why
// would anything multiply inherit nsIStyleRule anyway?)
#ifdef DEBUG
nsCOMPtr<nsIStyleRule> iRule = do_QueryInterface(value->mRule);
NS_ASSERTION(static_cast<nsIStyleRule*>(value->mRule) == iRule.get(),
"Please fix QI so this performance optimization is valid");
#endif
value->mRule->RuleMatched();
aData->mRuleWalker->Forward(static_cast<nsIStyleRule*>(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)) {
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->mRule, value->mSelector->mNext,
static_cast<RuleProcessorData*>(aData));
}
}
}
}
}
#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
// |IsStateSelector| below determines which selectors are in
// |cascade->mStateSelectors|.
nsRestyleHint hint = nsRestyleHint(0);
if (cascade) {
nsCSSSelector **iter = cascade->mStateSelectors.Elements(),
**end = iter + cascade->mStateSelectors.Length();
for(; iter != end; ++iter) {
nsCSSSelector* selector = *iter;
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.
TreeMatchContext treeContext(PR_FALSE,
nsRuleWalker::eLinksVisitedOrUnvisited);
NodeMatchContext nodeContext(aData->mStateMask, PR_FALSE);
if ((possibleChange & ~hint) &&
SelectorMatches(*aData, selector, nodeContext, treeContext) &&
SelectorMatchesTree(*aData, selector->mNext, treeContext, PR_FALSE))
{
hint = nsRestyleHint(hint | possibleChange);
}
}
}
return hint;
}
PRBool
nsCSSRuleProcessor::HasDocumentStateDependentStyle(StateRuleProcessorData* aData)
{
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
return cascade && (cascade->mSelectorDocumentStates & aData->mStateMask) != 0;
}
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;
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.
TreeMatchContext treeContext(PR_FALSE,
nsRuleWalker::eLinksVisitedOrUnvisited);
NodeMatchContext nodeContext(0, PR_FALSE);
if ((possibleChange & ~(aData->change)) &&
SelectorMatches(*data, aSelector, nodeContext, treeContext) &&
SelectorMatchesTree(*data, aSelector->mNext, treeContext, PR_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->mNameSpaceID == kNameSpaceID_XUL &&
aData->mElement == aData->mElement->GetOwnerDoc()->GetRootElement())
{
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()) {
nsCSSSelector **iter = cascade->mIDSelectors.Elements(),
**end = iter + cascade->mIDSelectors.Length();
for(; iter != end; ++iter) {
AttributeEnumFunc(*iter, &data);
}
}
if (aData->mAttribute == aData->mElement->GetClassAttributeName()) {
const nsAttrValue* elementClasses = aData->mClasses;
if (elementClasses) {
PRInt32 atomCount = elementClasses->GetAtomCount();
for (PRInt32 i = 0; i < atomCount; ++i) {
nsIAtom* curClass = elementClasses->AtomAt(i);
ClassSelectorEntry *entry =
static_cast<ClassSelectorEntry*>
(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);
}
}
AttributeSelectorEntry *entry = static_cast<AttributeSelectorEntry*>
(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 */ PRBool
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);
}
// Append all the currently-active font face rules to aArray. Return
// true for success and false for failure.
PRBool
nsCSSRuleProcessor::AppendFontFaceRules(
nsPresContext *aPresContext,
nsTArray<nsFontFaceRuleContainer>& aArray)
{
RuleCascadeData* cascade = GetRuleCascade(aPresContext);
if (cascade) {
if (!aArray.AppendElements(cascade->mFontFaceRules))
return PR_FALSE;
}
return PR_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 = nsnull;
while (data) {
RuleCascadeData *next = data->mNext;
delete data;
data = next;
}
return NS_OK;
}
// This function should return true only for selectors that need to be
// checked by |HasStateDependentStyle|.
inline
PRBool IsStateSelector(nsCSSSelector& aSelector)
{
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;
}
if (sPseudoClassBits[pseudoClass->mType]) {
return PR_TRUE;
}
}
return PR_FALSE;
}
inline
void AddSelectorDocumentStates(nsCSSSelector& aSelector, PRUint32* aStateMask)
{
for (nsPseudoClassList* pseudoClass = aSelector.mPseudoClassList;
pseudoClass; pseudoClass = pseudoClass->mNext) {
if (pseudoClass->mAtom == nsCSSPseudoClasses::mozLocaleDir) {
*aStateMask |= NS_DOCUMENT_STATE_RTL_LOCALE;
}
else if (pseudoClass->mAtom == nsCSSPseudoClasses::mozWindowInactive) {
*aStateMask |= NS_DOCUMENT_STATE_WINDOW_INACTIVE;
}
}
}
static PRBool
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)
{
// Track the selectors that depend on document states.
AddSelectorDocumentStates(*aSelectorPart, &aCascade->mSelectorDocumentStates);
// Build mStateSelectors.
if (IsStateSelector(*aSelectorPart))
aCascade->mStateSelectors.AppendElement(aSelectorInTopLevel);
// Build mIDSelectors
if (aSelectorPart->mIDList) {
aCascade->mIDSelectors.AppendElement(aSelectorInTopLevel);
}
// Build mClassSelectors
if (aSelectorPart == aSelectorInTopLevel) {
for (nsAtomList* curClass = aSelectorPart->mClassList; curClass;
curClass = curClass->mNext) {
ClassSelectorEntry *entry =
static_cast<ClassSelectorEntry*>(PL_DHashTableOperate(&aCascade->mClassSelectors,
curClass->mAtom,
PL_DHASH_ADD));
if (entry) {
entry->mSelectors.AppendElement(aSelectorInTopLevel);
}
}
} else if (aSelectorPart->mClassList) {
aCascade->mPossiblyNegatedClassSelectors.AppendElement(aSelectorInTopLevel);
}
// Build mAttributeSelectors.
for (nsAttrSelector *attr = aSelectorPart->mAttrList; attr;
attr = attr->mNext) {
nsTArray<nsCSSSelector*> *array =
aCascade->AttributeListFor(attr->mCasedAttr);
if (!array) {
return PR_FALSE;
}
array->AppendElement(aSelectorInTopLevel);
if (attr->mLowercaseAttr != attr->mCasedAttr) {
nsTArray<nsCSSSelector*> *array =
aCascade->AttributeListFor(attr->mLowercaseAttr);
if (!array) {
return PR_FALSE;
}
array->AppendElement(aSelectorInTopLevel);
}
}
// Recur through any :-moz-any selectors
for (nsPseudoClassList* pseudoClass = aSelectorPart->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 PR_FALSE;
}
}
}
}
return PR_TRUE;
}
static PRBool
AddRule(RuleSelectorPair* aRuleInfo, RuleCascadeData* aCascade)
{
RuleCascadeData * const cascade = aCascade;
// Build the rule hash.
nsCSSPseudoElements::Type pseudoType = aRuleInfo->mSelector->PseudoType();
if (NS_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 PR_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));
} 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));
#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;
}
// 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 = selector; negation;
negation = negation->mNegations) {
if (!AddSelector(cascade, selector, negation)) {
return PR_FALSE;
}
}
}
return PR_TRUE;
}
struct PerWeightData {
PRInt32 mWeight;
nsTArray<RuleSelectorPair> mRules; // forward order
};
struct RuleByWeightEntry : public PLDHashEntryHdr {
PerWeightData data; // mWeight is key, mRules are value
};
static PLDHashNumber
HashIntKey(PLDHashTable *table, const void *key)
{
return PLDHashNumber(NS_PTR_TO_INT32(key));
}
static PRBool
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 PRBool
InitWeightEntry(PLDHashTable *table, PLDHashEntryHdr *hdr,
const void *key)
{
RuleByWeightEntry* entry = static_cast<RuleByWeightEntry*>(hdr);
new (entry) RuleByWeightEntry();
return PR_TRUE;
}
static void
ClearWeightEntry(PLDHashTable *table, PLDHashEntryHdr *hdr)
{
RuleByWeightEntry* entry = static_cast<RuleByWeightEntry*>(hdr);
entry->~RuleByWeightEntry();
}
static PLDHashTableOps gRulesByWeightOps = {
PL_DHashAllocTable,
PL_DHashFreeTable,
HashIntKey,
MatchWeightEntry,
PL_DHashMoveEntryStub,
ClearWeightEntry,
PL_DHashFinalizeStub,
InitWeightEntry
};
struct CascadeEnumData {
CascadeEnumData(nsPresContext* aPresContext,
nsTArray<nsFontFaceRuleContainer>& aFontFaceRules,
nsMediaQueryResultCacheKey& aKey,
PLArenaPool& aArena,
PRUint8 aSheetType)
: mPresContext(aPresContext),
mFontFaceRules(aFontFaceRules),
mCacheKey(aKey),
mArena(aArena),
mSheetType(aSheetType)
{
if (!PL_DHashTableInit(&mRulesByWeight, &gRulesByWeightOps, nsnull,
sizeof(RuleByWeightEntry), 64))
mRulesByWeight.ops = nsnull;
}
~CascadeEnumData()
{
if (mRulesByWeight.ops)
PL_DHashTableFinish(&mRulesByWeight);
}
nsPresContext* mPresContext;
nsTArray<nsFontFaceRuleContainer>& mFontFaceRules;
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 RuleValue* linked lists (?)
PRUint8 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.
*/
static PRBool
CascadeRuleEnumFunc(nsICSSRule* aRule, void* aData)
{
CascadeEnumData* data = (CascadeEnumData*)aData;
PRInt32 type = aRule->GetType();
if (nsICSSRule::STYLE_RULE == type) {
nsICSSStyleRule* styleRule = (nsICSSStyleRule*)aRule;
for (nsCSSSelectorList *sel = styleRule->Selector();
sel; sel = sel->mNext) {
PRInt32 weight = sel->mWeight;
RuleByWeightEntry *entry = static_cast<RuleByWeightEntry*>(
PL_DHashTableOperate(&data->mRulesByWeight, NS_INT32_TO_PTR(weight),
PL_DHASH_ADD));
if (!entry)
return PR_FALSE;
entry->data.mWeight = weight;
// entry->data.mRules must be in forward order.
entry->data.mRules.AppendElement(RuleSelectorPair(styleRule,
sel->mSelectors));
}
}
else if (nsICSSRule::MEDIA_RULE == type ||
nsICSSRule::DOCUMENT_RULE == type) {
nsICSSGroupRule* groupRule = (nsICSSGroupRule*)aRule;
if (groupRule->UseForPresentation(data->mPresContext, data->mCacheKey))
if (!groupRule->EnumerateRulesForwards(CascadeRuleEnumFunc, aData))
return PR_FALSE;
}
else if (nsICSSRule::FONT_FACE_RULE == type) {
nsCSSFontFaceRule *fontFaceRule = static_cast<nsCSSFontFaceRule*>(aRule);
nsFontFaceRuleContainer *ptr = data->mFontFaceRules.AppendElement();
if (!ptr)
return PR_FALSE;
ptr->mRule = fontFaceRule;
ptr->mSheetType = data->mSheetType;
}
return PR_TRUE;
}
/* static */ PRBool
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 PR_FALSE;
}
return PR_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)
{
}
PRInt32 mIndex;
PerWeightData* mWeightArray;
};
static PLDHashOperator
FillWeightArray(PLDHashTable *table, PLDHashEntryHdr *hdr,
PRUint32 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->mCacheKey,
newCascade->mRuleHash.Arena(),
mSheetType);
if (!data.mRulesByWeight.ops)
return; /* out of memory */
for (PRUint32 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.
PRUint32 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, nsnull);
// Put things into the rule hash.
// The primary sort is by weight...
for (PRUint32 i = 0; i < weightCount; ++i) {
// and the secondary sort is by order. mRules are already in
// the right order..
nsTArray<RuleSelectorPair>& arr = weightArray[i].mRules;
for (RuleSelectorPair *cur = arr.Elements(),
*end = cur + arr.Length();
cur != end; ++cur) {
if (!AddRule(cur, newCascade))
return; /* out of memory */
}
}
// Ensure that the current one is always mRuleCascades.
newCascade->mNext = mRuleCascades;
mRuleCascades = newCascade.forget();
}
}
return;
}
/* static */ PRBool
nsCSSRuleProcessor::SelectorListMatches(RuleProcessorData& aData,
nsCSSSelectorList* aSelectorList)
{
while (aSelectorList) {
nsCSSSelector* sel = aSelectorList->mSelectors;
NS_ASSERTION(sel, "Should have *some* selectors");
NS_ASSERTION(!sel->IsPseudoElement(), "Shouldn't have been called");
TreeMatchContext treeContext(PR_FALSE,
nsRuleWalker::eRelevantLinkUnvisited);
NodeMatchContext nodeContext(0, PR_FALSE);
if (SelectorMatches(aData, sel, nodeContext, treeContext)) {
nsCSSSelector* next = sel->mNext;
if (!next || SelectorMatchesTree(aData, next, treeContext, PR_FALSE)) {
return PR_TRUE;
}
}
aSelectorList = aSelectorList->mNext;
}
return PR_FALSE;
}
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