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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"
#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 "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"
#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;
struct RuleValue {
/**
* |RuleValue|s are constructed before they become part of the
* |RuleHash|, to act as rule/selector pairs. |Add| is called when
* they are added to the |RuleHash|, and can be considered the second
* half of the constructor.
*
* |RuleValue|s are added to the rule hash from highest weight/order
* to lowest (since this is the fast way to build a singly linked
* list), so the index used to remember the order is backwards.
*/
RuleValue(nsICSSStyleRule* aRule, nsCSSSelector* aSelector)
: mRule(aRule), mSelector(aSelector) {}
RuleValue* Add(PRInt32 aBackwardIndex, RuleValue *aNext)
{
mBackwardIndex = aBackwardIndex;
mNext = aNext;
return this;
}
// CAUTION: ~RuleValue will never get called as RuleValues are arena
// allocated and arena cleanup will take care of deleting memory.
// Add code to RuleHash::~RuleHash to get it to call the destructor
// if any more cleanup needs to happen.
~RuleValue()
{
// Rule values are arena allocated. No need for any deletion.
}
// Placement new to arena allocate the RuleValues
void *operator new(size_t aSize, PLArenaPool &aArena) CPP_THROW_NEW {
void *mem;
PL_ARENA_ALLOCATE(mem, &aArena, aSize);
return mem;
}
nsICSSStyleRule* mRule;
nsCSSSelector* mSelector; // which of |mRule|'s selectors
PRInt32 mBackwardIndex; // High index means low weight/order.
RuleValue* mNext;
};
// ------------------------------
// Rule hash table
//
// Uses any of the sets of ops below.
struct RuleHashTableEntry : public PLDHashEntryHdr {
RuleValue *mRules; // linked list of |RuleValue|, null-terminated
};
static PLDHashNumber
RuleHash_CIHashKey(PLDHashTable *table, const void *key)
{
nsIAtom *atom = const_cast<nsIAtom*>(static_cast<const nsIAtom*>(key));
nsAutoString str;
atom->ToString(str);
ToUpperCase(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;
const char *match_str, *entry_str;
match_atom->GetUTF8String(&match_str);
entry_atom->GetUTF8String(&entry_str);
return (nsCRT::strcasecmp(entry_str, match_str) == 0);
}
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 nsIAtom*
RuleHash_TagTable_GetKey(PLDHashTable *table, const PLDHashEntryHdr *hdr)
{
const RuleHashTableEntry *entry =
static_cast<const RuleHashTableEntry*>(hdr);
return entry->mRules->mSelector->mTag;
}
static nsIAtom*
RuleHash_ClassTable_GetKey(PLDHashTable *table, const PLDHashEntryHdr *hdr)
{
const RuleHashTableEntry *entry =
static_cast<const RuleHashTableEntry*>(hdr);
return entry->mRules->mSelector->mClassList->mAtom;
}
static nsIAtom*
RuleHash_IdTable_GetKey(PLDHashTable *table, const PLDHashEntryHdr *hdr)
{
const RuleHashTableEntry *entry =
static_cast<const RuleHashTableEntry*>(hdr);
return entry->mRules->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->mSelector->mNameSpace;
}
static const RuleHashTableOps RuleHash_TagTable_Ops = {
{
PL_DHashAllocTable,
PL_DHashFreeTable,
PL_DHashVoidPtrKeyStub,
RuleHash_CSMatchEntry,
PL_DHashMoveEntryStub,
PL_DHashClearEntryStub,
PL_DHashFinalizeStub,
NULL
},
RuleHash_TagTable_GetKey
};
// Case-sensitive ops.
static const RuleHashTableOps RuleHash_ClassTable_CSOps = {
{
PL_DHashAllocTable,
PL_DHashFreeTable,
PL_DHashVoidPtrKeyStub,
RuleHash_CSMatchEntry,
PL_DHashMoveEntryStub,
PL_DHashClearEntryStub,
PL_DHashFinalizeStub,
NULL
},
RuleHash_ClassTable_GetKey
};
// Case-insensitive ops.
static const RuleHashTableOps RuleHash_ClassTable_CIOps = {
{
PL_DHashAllocTable,
PL_DHashFreeTable,
RuleHash_CIHashKey,
RuleHash_CIMatchEntry,
PL_DHashMoveEntryStub,
PL_DHashClearEntryStub,
PL_DHashFinalizeStub,
NULL
},
RuleHash_ClassTable_GetKey
};
// Case-sensitive ops.
static const RuleHashTableOps RuleHash_IdTable_CSOps = {
{
PL_DHashAllocTable,
PL_DHashFreeTable,
PL_DHashVoidPtrKeyStub,
RuleHash_CSMatchEntry,
PL_DHashMoveEntryStub,
PL_DHashClearEntryStub,
PL_DHashFinalizeStub,
NULL
},
RuleHash_IdTable_GetKey
};
// Case-insensitive ops.
static const RuleHashTableOps RuleHash_IdTable_CIOps = {
{
PL_DHashAllocTable,
PL_DHashFreeTable,
RuleHash_CIHashKey,
RuleHash_CIMatchEntry,
PL_DHashMoveEntryStub,
PL_DHashClearEntryStub,
PL_DHashFinalizeStub,
NULL
},
RuleHash_IdTable_GetKey
};
static const PLDHashTableOps RuleHash_NameSpaceTable_Ops = {
PL_DHashAllocTable,
PL_DHashFreeTable,
RuleHash_NameSpaceTable_HashKey,
RuleHash_NameSpaceTable_MatchEntry,
PL_DHashMoveEntryStub,
PL_DHashClearEntryStub,
PL_DHashFinalizeStub,
NULL,
};
#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 PrependRule(RuleValue *aRuleInfo);
void EnumerateAllRules(PRInt32 aNameSpace, nsIAtom* aTag, nsIAtom* aID,
const nsAttrValue* aClassList,
RuleEnumFunc aFunc, void* aData);
void EnumerateTagRules(nsIAtom* aTag,
RuleEnumFunc aFunc, void* aData);
PLArenaPool& Arena() { return mArena; }
protected:
void PrependRuleToTable(PLDHashTable* aTable, const void* aKey,
RuleValue* aRuleInfo);
void PrependUniversalRule(RuleValue* aRuleInfo);
// All rule values in these hashtables are arena allocated
PRInt32 mRuleCount;
PLDHashTable mIdTable;
PLDHashTable mClassTable;
PLDHashTable mTagTable;
PLDHashTable mNameSpaceTable;
RuleValue *mUniversalRules;
RuleValue** mEnumList;
PRInt32 mEnumListSize;
PLArenaPool mArena;
#ifdef RULE_HASH_STATS
PRUint32 mUniversalSelectors;
PRUint32 mNameSpaceSelectors;
PRUint32 mTagSelectors;
PRUint32 mClassSelectors;
PRUint32 mIdSelectors;
PRUint32 mElementsMatched;
PRUint32 mPseudosMatched;
PRUint32 mElementUniversalCalls;
PRUint32 mElementNameSpaceCalls;
PRUint32 mElementTagCalls;
PRUint32 mElementClassCalls;
PRUint32 mElementIdCalls;
PRUint32 mPseudoTagCalls;
#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),
mPseudosMatched(0),
mElementUniversalCalls(0),
mElementNameSpaceCalls(0),
mElementTagCalls(0),
mElementClassCalls(0),
mElementIdCalls(0),
mPseudoTagCalls(0)
#endif
{
// Initialize our arena
PL_INIT_ARENA_POOL(&mArena, "RuleHashArena", NS_RULEHASH_ARENA_BLOCK_SIZE);
PL_DHashTableInit(&mTagTable, &RuleHash_TagTable_Ops.ops, nsnull,
sizeof(RuleHashTableEntry), 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()
{
#ifdef RULE_HASH_STATS
printf(
"RuleHash(%p):\n"
" Selectors: Universal (%u) NameSpace(%u) Tag(%u) Class(%u) Id(%u)\n"
" Content Nodes: Elements(%u) Pseudo-Elements(%u)\n"
" Element Calls: Universal(%u) NameSpace(%u) Tag(%u) Class(%u) Id(%u)\n"
" Pseudo-Element Calls: Tag(%u)\n",
static_cast<void*>(this),
mUniversalSelectors, mNameSpaceSelectors, mTagSelectors,
mClassSelectors, mIdSelectors,
mElementsMatched,
mPseudosMatched,
mElementUniversalCalls, mElementNameSpaceCalls, mElementTagCalls,
mElementClassCalls, mElementIdCalls,
mPseudoTagCalls);
#ifdef PRINT_UNIVERSAL_RULES
{
RuleValue* value = mUniversalRules;
if (value) {
printf(" Universal rules:\n");
do {
nsAutoString selectorText;
PRUint32 lineNumber = value->mRule->GetLineNumber();
nsCOMPtr<nsIStyleSheet> sheet;
value->mRule->GetStyleSheet(*getter_AddRefs(sheet));
nsCOMPtr<nsICSSStyleSheet> cssSheet = do_QueryInterface(sheet);
value->mSelector->ToString(selectorText, cssSheet);
printf(" line %d, %s\n",
lineNumber, NS_ConvertUTF16toUTF8(selectorText).get());
value = value->mNext;
} while (value);
}
}
#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::PrependRuleToTable(PLDHashTable* aTable, const void* aKey,
RuleValue* aRuleInfo)
{
// Get a new or existing entry.
RuleHashTableEntry *entry = static_cast<RuleHashTableEntry*>
(PL_DHashTableOperate(aTable, aKey, PL_DHASH_ADD));
if (!entry)
return;
entry->mRules = aRuleInfo->Add(mRuleCount++, entry->mRules);
}
void RuleHash::PrependUniversalRule(RuleValue *aRuleInfo)
{
mUniversalRules = aRuleInfo->Add(mRuleCount++, mUniversalRules);
}
void RuleHash::PrependRule(RuleValue *aRuleInfo)
{
nsCSSSelector *selector = aRuleInfo->mSelector;
if (nsnull != selector->mIDList) {
PrependRuleToTable(&mIdTable, selector->mIDList->mAtom, aRuleInfo);
RULE_HASH_STAT_INCREMENT(mIdSelectors);
}
else if (nsnull != selector->mClassList) {
PrependRuleToTable(&mClassTable, selector->mClassList->mAtom, aRuleInfo);
RULE_HASH_STAT_INCREMENT(mClassSelectors);
}
else if (nsnull != selector->mTag) {
PrependRuleToTable(&mTagTable, selector->mTag, aRuleInfo);
RULE_HASH_STAT_INCREMENT(mTagSelectors);
}
else if (kNameSpaceID_Unknown != selector->mNameSpace) {
PrependRuleToTable(&mNameSpaceTable,
NS_INT32_TO_PTR(selector->mNameSpace), aRuleInfo);
RULE_HASH_STAT_INCREMENT(mNameSpaceSelectors);
}
else { // universal tag selector
PrependUniversalRule(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_) \
do { ++(var_); (list_) = (list_)->mNext; } while (list_)
#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, void* 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 = PR_MAX(testCount, MIN_ENUM_LIST_SIZE);
mEnumList = new RuleValue*[mEnumListSize];
}
PRInt32 valueCount = 0;
RULE_HASH_STAT_INCREMENT(mElementsMatched);
{ // universal rules
RuleValue* value = mUniversalRules;
if (nsnull != value) {
mEnumList[valueCount++] = value;
RULE_HASH_STAT_INCREMENT_LIST_COUNT(value, mElementUniversalCalls);
}
}
// universal rules within the namespace
if (kNameSpaceID_Unknown != aNameSpace) {
RuleHashTableEntry *entry = static_cast<RuleHashTableEntry*>
(PL_DHashTableOperate(&mNameSpaceTable, NS_INT32_TO_PTR(aNameSpace),
PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_BUSY(entry)) {
RuleValue *value = entry->mRules;
mEnumList[valueCount++] = value;
RULE_HASH_STAT_INCREMENT_LIST_COUNT(value, mElementNameSpaceCalls);
}
}
if (nsnull != aTag) {
RuleHashTableEntry *entry = static_cast<RuleHashTableEntry*>
(PL_DHashTableOperate(&mTagTable, aTag, PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_BUSY(entry)) {
RuleValue *value = entry->mRules;
mEnumList[valueCount++] = value;
RULE_HASH_STAT_INCREMENT_LIST_COUNT(value, mElementTagCalls);
}
}
if (nsnull != aID) {
RuleHashTableEntry *entry = static_cast<RuleHashTableEntry*>
(PL_DHashTableOperate(&mIdTable, aID, PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_BUSY(entry)) {
RuleValue *value = entry->mRules;
mEnumList[valueCount++] = value;
RULE_HASH_STAT_INCREMENT_LIST_COUNT(value, mElementIdCalls);
}
}
{ // extra scope to work around compiler bugs with |for| scoping.
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)) {
RuleValue *value = entry->mRules;
mEnumList[valueCount++] = value;
RULE_HASH_STAT_INCREMENT_LIST_COUNT(value, 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 highestRuleIndex = mEnumList[valueIndex]->mBackwardIndex;
for (PRInt32 index = 1; index < valueCount; ++index) {
PRInt32 ruleIndex = mEnumList[index]->mBackwardIndex;
if (ruleIndex > highestRuleIndex) {
valueIndex = index;
highestRuleIndex = ruleIndex;
}
}
RuleValue *cur = mEnumList[valueIndex];
(*aFunc)(cur->mRule, cur->mSelector, aData);
RuleValue *next = cur->mNext;
mEnumList[valueIndex] = next ? next : mEnumList[--valueCount];
}
// Fast loop over single value.
RuleValue* value = mEnumList[0];
do {
(*aFunc)(value->mRule, value->mSelector, aData);
value = value->mNext;
} while (value);
}
}
void RuleHash::EnumerateTagRules(nsIAtom* aTag, RuleEnumFunc aFunc, void* aData)
{
RuleHashTableEntry *entry = static_cast<RuleHashTableEntry*>
(PL_DHashTableOperate(&mTagTable, aTag, PL_DHASH_LOOKUP));
RULE_HASH_STAT_INCREMENT(mPseudosMatched);
if (PL_DHASH_ENTRY_IS_BUSY(entry)) {
RuleValue *tagValue = entry->mRules;
do {
RULE_HASH_STAT_INCREMENT(mPseudoTagCalls);
(*aFunc)(tagValue->mRule, tagValue->mSelector, aData);
tagValue = tagValue->mNext;
} while (tagValue);
}
}
//--------------------------------
// 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
};
//--------------------------------
struct RuleCascadeData {
RuleCascadeData(nsIAtom *aMedium, PRBool aQuirksMode)
: mRuleHash(aQuirksMode),
mStateSelectors(),
mCacheKey(aMedium),
mNext(nsnull)
{
PL_DHashTableInit(&mAttributeSelectors, &AttributeSelectorOps, nsnull,
sizeof(AttributeSelectorEntry), 16);
}
~RuleCascadeData()
{
PL_DHashTableFinish(&mAttributeSelectors);
}
RuleHash mRuleHash;
nsTArray<nsCSSSelector*> mStateSelectors;
nsTArray<nsCSSSelector*> mClassSelectors;
nsTArray<nsCSSSelector*> mIDSelectors;
PLDHashTable mAttributeSelectors;
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
};
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;
}
// -------------------------------
// CSS Style rule processor implementation
//
nsCSSRuleProcessor::nsCSSRuleProcessor(const nsCOMArray<nsICSSStyleSheet>& aSheets,
PRUint8 aSheetType)
: mSheets(aSheets)
, mRuleCascades(nsnull)
, mLastPresContext(nsnull)
, mSheetType(aSheetType)
{
for (PRInt32 i = mSheets.Count() - 1; i >= 0; --i)
mSheets[i]->AddRuleProcessor(this);
}
nsCSSRuleProcessor::~nsCSSRuleProcessor()
{
for (PRInt32 i = mSheets.Count() - 1; i >= 0; --i)
mSheets[i]->DropRuleProcessor(this);
mSheets.Clear();
ClearRuleCascades();
}
NS_IMPL_ISUPPORTS1(nsCSSRuleProcessor, nsIStyleRuleProcessor)
/* static */ void
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);
}
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);
PRInt32 metricResult;
lookAndFeel->GetMetric(nsILookAndFeel::eMetric_ScrollArrowStyle, metricResult);
if (metricResult & nsILookAndFeel::eMetric_ScrollArrowStartBackward) {
sSystemMetrics->AppendElement(do_GetAtom("scrollbar-start-backward"));
}
if (metricResult & nsILookAndFeel::eMetric_ScrollArrowStartForward) {
sSystemMetrics->AppendElement(do_GetAtom("scrollbar-start-forward"));
}
if (metricResult & nsILookAndFeel::eMetric_ScrollArrowEndBackward) {
sSystemMetrics->AppendElement(do_GetAtom("scrollbar-end-backward"));
}
if (metricResult & nsILookAndFeel::eMetric_ScrollArrowEndForward) {
sSystemMetrics->AppendElement(do_GetAtom("scrollbar-end-forward"));
}
lookAndFeel->GetMetric(nsILookAndFeel::eMetric_ScrollSliderStyle, metricResult);
if (metricResult != nsILookAndFeel::eMetric_ScrollThumbStyleNormal) {
sSystemMetrics->AppendElement(do_GetAtom("scrollbar-thumb-proportional"));
}
lookAndFeel->GetMetric(nsILookAndFeel::eMetric_ImagesInMenus, metricResult);
if (metricResult) {
sSystemMetrics->AppendElement(do_GetAtom("images-in-menus"));
}
rv = lookAndFeel->GetMetric(nsILookAndFeel::eMetric_WindowsDefaultTheme, metricResult);
if (NS_SUCCEEDED(rv) && metricResult) {
sSystemMetrics->AppendElement(do_GetAtom("windows-default-theme"));
}
rv = lookAndFeel->GetMetric(nsILookAndFeel::eMetric_MacGraphiteTheme, metricResult);
if (NS_SUCCEEDED(rv) && metricResult) {
sSystemMetrics->AppendElement(do_GetAtom("mac-graphite-theme"));
}
rv = lookAndFeel->GetMetric(nsILookAndFeel::eMetric_DWMCompositor, metricResult);
if (NS_SUCCEEDED(rv) && metricResult) {
sSystemMetrics->AppendElement(do_GetAtom("windows-compositor"));
}
rv = lookAndFeel->GetMetric(nsILookAndFeel::eMetric_WindowsClassic, metricResult);
if (NS_SUCCEEDED(rv) && metricResult) {
sSystemMetrics->AppendElement(do_GetAtom("windows-classic"));
}
return PR_TRUE;
}
/* static */ void
nsCSSRuleProcessor::FreeSystemMetrics()
{
delete sSystemMetrics;
sSystemMetrics = nsnull;
}
RuleProcessorData::RuleProcessorData(nsPresContext* aPresContext,
nsIContent* aContent,
nsRuleWalker* aRuleWalker,
nsCompatibility* aCompat /*= nsnull*/)
{
MOZ_COUNT_CTOR(RuleProcessorData);
NS_ASSERTION(!aContent || aContent->IsNodeOfType(nsINode::eELEMENT),
"non-element leaked into SelectorMatches");
mPresContext = aPresContext;
mContent = aContent;
mParentContent = nsnull;
mRuleWalker = aRuleWalker;
mScopedRoot = nsnull;
mContentTag = nsnull;
mContentID = nsnull;
mHasAttributes = PR_FALSE;
mIsHTMLContent = PR_FALSE;
mIsLink = PR_FALSE;
mLinkState = eLinkState_Unknown;
mEventState = 0;
mNameSpaceID = kNameSpaceID_Unknown;
mPreviousSiblingData = nsnull;
mParentData = nsnull;
mLanguage = nsnull;
mClasses = nsnull;
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(aContent, "Must have content");
NS_ASSERTION(aContent->GetOwnerDoc(), "Must have document");
mCompatMode = aContent->GetOwnerDoc()->GetCompatibilityMode();
}
if (aContent) {
NS_ASSERTION(aContent->GetOwnerDoc(), "Document-less node here?");
// get the tag and parent
mContentTag = aContent->Tag();
mParentContent = aContent->GetParent();
// get the event state
if (mPresContext) {
mPresContext->EventStateManager()->GetContentState(aContent, mEventState);
} else {
mEventState = aContent->IntrinsicState();
}
// get the ID and classes for the content
mContentID = aContent->GetID();
mClasses = aContent->GetClasses();
// see if there are attributes for the content
mHasAttributes = aContent->GetAttrCount() > 0;
// check for HTMLContent and Link status
if (aContent->IsNodeOfType(nsINode::eHTML)) {
mIsHTMLContent = PR_TRUE;
// Note that we want to treat non-XML HTML content as XHTML for namespace
// purposes, since html.css has that namespace declared.
mNameSpaceID = kNameSpaceID_XHTML;
} else {
// get the namespace
mNameSpaceID = aContent->GetNameSpaceID();
}
// if HTML content and it has some attributes, check for an HTML link
// NOTE: optimization: cannot be a link if no attributes (since it needs an href)
nsILinkHandler* linkHandler =
mPresContext ? mPresContext->GetLinkHandler() : nsnull;
if (mIsHTMLContent && mHasAttributes) {
// check if it is an HTML Link
if(nsStyleUtil::IsHTMLLink(aContent, mContentTag, linkHandler,
&mLinkState)) {
mIsLink = PR_TRUE;
}
}
// if not an HTML link, check for a simple xlink (cannot be both HTML link and xlink)
// NOTE: optimization: cannot be an XLink if no attributes (since it needs an
if(!mIsLink &&
mHasAttributes &&
!(mIsHTMLContent || aContent->IsNodeOfType(nsINode::eXUL)) &&
nsStyleUtil::IsLink(aContent, linkHandler, &mLinkState)) {
mIsLink = PR_TRUE;
}
}
if (mLinkState == eLinkState_Visited && !gSupportVisitedPseudo) {
mLinkState = eLinkState_Unvisited;
}
}
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 = mContent; 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->IsNodeOfType(nsINode::eHTML)) {
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;
}
static inline PRInt32
CSSNameSpaceID(nsIContent *aContent)
{
return aContent->IsNodeOfType(nsINode::eHTML)
? kNameSpaceID_XHTML
: aContent->GetNameSpaceID();
}
PRInt32
RuleProcessorData::GetNthIndex(PRBool aIsOfType, PRBool aIsFromEnd,
PRBool aCheckEdgeOnly)
{
NS_ASSERTION(mParentContent, "caller should check mParentContent");
NS_ASSERTION(!mPreviousSiblingData ||
mPreviousSiblingData->mContent->IsNodeOfType(nsINode::eELEMENT),
"Unexpected previous sibling data");
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 == mContent)
break;
if (child->IsNodeOfType(nsINode::eELEMENT) &&
(!aIsOfType ||
(child->Tag() == mContentTag &&
CSSNameSpaceID(child) == 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;
}
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;
}
inline PRBool IsLinkPseudo(nsIAtom* aAtom)
{
return PRBool ((nsCSSPseudoClasses::link == aAtom) ||
(nsCSSPseudoClasses::visited == aAtom) ||
(nsCSSPseudoClasses::mozAnyLink == aAtom));
}
// Return whether we should apply a "global" (i.e., universal-tag)
// selector for event states in quirks mode. Note that
// |data.mIsLink| 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)
{
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 nsCaseInsensitiveStringComparator ciComparator;
const nsStringComparator& comparator = aAttrSelector->mCaseSensitive
? 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;
}
}
// NOTE: For |aStateMask| and |aAttribute| to work correctly, it's
// important that any change that changes multiple state bits and
// maybe an attribute include all those state bits and the attribute
// 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).
// If |aForStyling| is false, we shouldn't mark slow-selector bits on nodes.
// |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 or aAttribute
static PRBool SelectorMatches(RuleProcessorData &data,
nsCSSSelector* aSelector,
PRInt32 aStateMask, // states NOT to test
nsIAtom* aAttribute, // attribute NOT to test
PRBool aForStyling,
PRBool* const aDependence = nsnull)
{
// namespace/tag match
if ((kNameSpaceID_Unknown != aSelector->mNameSpace &&
data.mNameSpaceID != aSelector->mNameSpace) ||
(aSelector->mTag && aSelector->mTag != data.mContentTag)) {
// optimization : bail out early if we can
return PR_FALSE;
}
PRBool result = PR_TRUE;
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.
const PRBool setNodeFlags = aForStyling && aStateMask == 0 && !aAttribute;
// test for pseudo class match
// first-child, root, lang, active, focus, hover, link, visited...
// XXX disabled, enabled, selected, selection
for (nsPseudoClassList* pseudoClass = aSelector->mPseudoClassList;
pseudoClass && result; pseudoClass = pseudoClass->mNext) {
PRInt32 stateToCheck = 0;
if (nsCSSPseudoClasses::firstNode == pseudoClass->mAtom) {
nsIContent *firstNode = nsnull;
nsIContent *parent = data.mParentContent;
if (parent) {
if (setNodeFlags)
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));
}
result = (data.mContent == firstNode);
}
else if (nsCSSPseudoClasses::lastNode == pseudoClass->mAtom) {
nsIContent *lastNode = nsnull;
nsIContent *parent = data.mParentContent;
if (parent) {
if (setNodeFlags)
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));
}
result = (data.mContent == lastNode);
}
else if (nsCSSPseudoClasses::firstChild == pseudoClass->mAtom ||
nsCSSPseudoClasses::lastChild == pseudoClass->mAtom ||
nsCSSPseudoClasses::onlyChild == pseudoClass->mAtom) {
nsIContent *parent = data.mParentContent;
if (parent) {
const PRBool checkFirst =
pseudoClass->mAtom != nsCSSPseudoClasses::lastChild;
const PRBool checkLast =
pseudoClass->mAtom != nsCSSPseudoClasses::firstChild;
if (setNodeFlags)
parent->SetFlags(NODE_HAS_EDGE_CHILD_SELECTOR);
result = (!checkFirst ||
data.GetNthIndex(PR_FALSE, PR_FALSE, PR_TRUE) == 1) &&
(!checkLast ||
data.GetNthIndex(PR_FALSE, PR_TRUE, PR_TRUE) == 1);
} else {
result = PR_FALSE;
}
}
else if (nsCSSPseudoClasses::nthChild == pseudoClass->mAtom ||
nsCSSPseudoClasses::nthLastChild == pseudoClass->mAtom ||
nsCSSPseudoClasses::nthOfType == pseudoClass->mAtom ||
nsCSSPseudoClasses::nthLastOfType == pseudoClass->mAtom) {
nsIContent *parent = data.mParentContent;
if (parent) {
PRBool isOfType =
nsCSSPseudoClasses::nthOfType == pseudoClass->mAtom ||
nsCSSPseudoClasses::nthLastOfType == pseudoClass->mAtom;
PRBool isFromEnd =
nsCSSPseudoClasses::nthLastChild == pseudoClass->mAtom ||
nsCSSPseudoClasses::nthLastOfType == pseudoClass->mAtom;
if (setNodeFlags) {
if (isFromEnd)
parent->SetFlags(NODE_HAS_SLOW_SELECTOR);
else
parent->SetFlags(NODE_HAS_SLOW_SELECTOR_NOAPPEND);
}
const PRInt32 index = data.GetNthIndex(isOfType, isFromEnd, PR_FALSE);
if (index <= 0) {
// Node is anonymous content (not really a child of its parent).
result = PR_FALSE;
} else {
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) {
result = b == index;
} else {
// 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;
result = n >= 0 && (a * n == index - b);
}
}
} else {
result = PR_FALSE;
}
}
else if (nsCSSPseudoClasses::firstOfType == pseudoClass->mAtom ||
nsCSSPseudoClasses::lastOfType == pseudoClass->mAtom ||
nsCSSPseudoClasses::onlyOfType == pseudoClass->mAtom) {
nsIContent *parent = data.mParentContent;
if (parent) {
const PRBool checkFirst =
pseudoClass->mAtom != nsCSSPseudoClasses::lastOfType;
const PRBool checkLast =
pseudoClass->mAtom != nsCSSPseudoClasses::firstOfType;
if (setNodeFlags) {
if (checkLast)
parent->SetFlags(NODE_HAS_SLOW_SELECTOR);
else
parent->SetFlags(NODE_HAS_SLOW_SELECTOR_NOAPPEND);
}
result = (!checkFirst ||
data.GetNthIndex(PR_TRUE, PR_FALSE, PR_TRUE) == 1) &&
(!checkLast ||
data.GetNthIndex(PR_TRUE, PR_TRUE, PR_TRUE) == 1);
} else {
result = PR_FALSE;
}
}
else if (nsCSSPseudoClasses::empty == pseudoClass->mAtom ||
nsCSSPseudoClasses::mozOnlyWhitespace == pseudoClass->mAtom) {
nsIContent *child = nsnull;
nsIContent *element = data.mContent;
const PRBool isWhitespaceSignificant =
nsCSSPseudoClasses::empty == pseudoClass->mAtom;
PRInt32 index = -1;
if (setNodeFlags)
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));
result = (child == nsnull);
}
else if (nsCSSPseudoClasses::mozEmptyExceptChildrenWithLocalname == pseudoClass->mAtom) {
NS_ASSERTION(pseudoClass->u.mString, "Must have string!");
nsIContent *child = nsnull;
nsIContent *element = data.mContent;
PRInt32 index = -1;
if (setNodeFlags)
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)))));
result = (child == nsnull);
}
else if (nsCSSPseudoClasses::mozSystemMetric == pseudoClass->mAtom) {
if (!sSystemMetrics && !InitSystemMetrics()) {
return PR_FALSE;
}
NS_ASSERTION(pseudoClass->u.mString, "Must have string!");
nsCOMPtr<nsIAtom> metric = do_GetAtom(pseudoClass->u.mString);
result = sSystemMetrics->IndexOf(metric) !=
sSystemMetrics->NoIndex;
}
else if (nsCSSPseudoClasses::mozHasHandlerRef == pseudoClass->mAtom) {
nsIContent *child = nsnull;
nsIContent *element = data.mContent;
PRInt32 index = -1;
result = PR_FALSE;
if (element) {
do {
child = element->GetChildAt(++index);
if (child && child->IsNodeOfType(nsINode::eHTML) &&
child->Tag() == nsGkAtoms::param &&
child->AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
NS_LITERAL_STRING("pluginurl"), eIgnoreCase)) {
result = PR_TRUE;
break;
}
} while (child);
}
}
else if (nsCSSPseudoClasses::root == pseudoClass->mAtom) {
result = (data.mParentContent == nsnull &&
data.mContent &&
data.mContent ==
data.mContent->GetOwnerDoc()->GetRootContent());
}
else if (nsCSSPseudoClasses::mozBoundElement == pseudoClass->mAtom) {
// XXXldb How do we know where the selector came from? And what
// if there are multiple bindings, and we should be matching the
// outer one?
result = (data.mScopedRoot && data.mScopedRoot == data.mContent);
}
else if (nsCSSPseudoClasses::lang == pseudoClass->mAtom) {
NS_ASSERTION(nsnull != pseudoClass->u.mString, "null lang parameter");
result = PR_FALSE;
if (pseudoClass->u.mString && *pseudoClass->u.mString) {
// 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
result = nsStyleUtil::DashMatchCompare(*lang,
nsDependentString(pseudoClass->u.mString),
nsCaseInsensitiveStringComparator());
}
else if (data.mContent) {
nsIDocument* doc = data.mContent->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,
nsCaseInsensitiveStringComparator())) {
result = PR_TRUE;
break;
}
begin = end + 1;
}
}
}
}
} else if (nsCSSPseudoClasses::active == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_ACTIVE;
}
else if (nsCSSPseudoClasses::focus == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_FOCUS;
}
else if (nsCSSPseudoClasses::hover == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_HOVER;
}
else if (nsCSSPseudoClasses::mozDragOver == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_DRAGOVER;
}
else if (nsCSSPseudoClasses::target == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_URLTARGET;
}
else if (IsLinkPseudo(pseudoClass->mAtom)) {
if (data.mIsLink) {
if (nsCSSPseudoClasses::mozAnyLink == pseudoClass->mAtom) {
result = PR_TRUE;
}
else {
NS_ASSERTION(nsCSSPseudoClasses::link == pseudoClass->mAtom ||
nsCSSPseudoClasses::visited == pseudoClass->mAtom,
"somebody changed IsLinkPseudo");
NS_ASSERTION(data.mLinkState == eLinkState_Unvisited ||
data.mLinkState == eLinkState_Visited,
"unexpected link state for mIsLink");
if (aStateMask & NS_EVENT_STATE_VISITED) {
result = PR_TRUE;
if (aDependence)
*aDependence = PR_TRUE;
} else {
result = ((eLinkState_Unvisited == data.mLinkState) ==
(nsCSSPseudoClasses::link == pseudoClass->mAtom));
}
}
}
else {
result = PR_FALSE; // not a link
}
}
else if (nsCSSPseudoClasses::checked == pseudoClass->mAtom) {
// This pseudoclass matches the selected state on the following elements:
// <option>
// <input type=checkbox>
// <input type=radio>
stateToCheck = NS_EVENT_STATE_CHECKED;
}
else if (nsCSSPseudoClasses::enabled == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_ENABLED;
}
else if (nsCSSPseudoClasses::disabled == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_DISABLED;
}
else if (nsCSSPseudoClasses::mozBroken == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_BROKEN;
}
else if (nsCSSPseudoClasses::mozUserDisabled == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_USERDISABLED;
}
else if (nsCSSPseudoClasses::mozSuppressed == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_SUPPRESSED;
}
else if (nsCSSPseudoClasses::mozLoading == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_LOADING;
}
else if (nsCSSPseudoClasses::mozTypeUnsupported == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_TYPE_UNSUPPORTED;
}
else if (nsCSSPseudoClasses::mozHandlerDisabled == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_HANDLER_DISABLED;
}
else if (nsCSSPseudoClasses::mozHandlerBlocked == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_HANDLER_BLOCKED;
}
else if (nsCSSPseudoClasses::defaultPseudo == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_DEFAULT;
}
else if (nsCSSPseudoClasses::required == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_REQUIRED;
}
else if (nsCSSPseudoClasses::optional == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_OPTIONAL;
}
else if (nsCSSPseudoClasses::valid == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_VALID;
}
else if (nsCSSPseudoClasses::invalid == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_INVALID;
}
else if (nsCSSPseudoClasses::inRange == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_INRANGE;
}
else if (nsCSSPseudoClasses::outOfRange == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_OUTOFRANGE;
}
else if (nsCSSPseudoClasses::mozReadOnly == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_MOZ_READONLY;
}
else if (nsCSSPseudoClasses::mozReadWrite == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_MOZ_READWRITE;
}
else if (nsCSSPseudoClasses::indeterminate == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_INDETERMINATE;
}
else if (nsCSSPseudoClasses::mozIsHTML == pseudoClass->mAtom) {
result = data.mIsHTMLContent &&
data.mContent->GetNameSpaceID() == kNameSpaceID_None;
}
#ifdef MOZ_MATHML
else if (nsCSSPseudoClasses::mozMathIncrementScriptLevel == pseudoClass->mAtom) {
stateToCheck = NS_EVENT_STATE_INCREMENT_SCRIPT_LEVEL;
}
#endif
else {
NS_ERROR("CSS parser parsed a pseudo-class that we do not handle");
result = PR_FALSE; // unknown pseudo class
}
if (stateToCheck) {
// check if the element is event-sensitive for :hover and :active
if ((stateToCheck & (NS_EVENT_STATE_HOVER | NS_EVENT_STATE_ACTIVE)) &&
data.mCompatMode == eCompatibility_NavQuirks &&
// global selector (but don't check .class):
!aSelector->mTag && !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.mIsLink &&
!IsQuirkEventSensitive(data.mContentTag)) {
// In quirks mode, only make certain elements sensitive to
// selectors ":hover" and ":active".
result = PR_FALSE;
} else {
if (aStateMask & stateToCheck) {
result = PR_TRUE;
if (aDependence)
*aDependence = PR_TRUE;
} else {
result = (0 != (data.mEventState & stateToCheck));
}
}
}
}
if (result && aSelector->mAttrList) {
// test for attribute match
if (!data.mHasAttributes && !aAttribute) {
// if no attributes on the content, no match
result = PR_FALSE;
} else {
NS_ASSERTION(data.mContent,
"Must have content if either data.mHasAttributes or "
"aAttribute is set!");
result = PR_TRUE;
nsAttrSelector* attr = aSelector->mAttrList;
do {
if (attr->mAttr == aAttribute) {
// XXX we should really have a namespace, not just an attr
// name, in HasAttributeDependentStyle!
result = PR_TRUE;
if (aDependence)
*aDependence = PR_TRUE;
}
else 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.mContent->GetAttrCount();
result = PR_FALSE;
for (PRUint32 i = 0; i < attrCount; ++i) {
const nsAttrName* attrName =
data.mContent->GetAttrNameAt(i);
NS_ASSERTION(attrName, "GetAttrCount lied or GetAttrNameAt failed");
if (attrName->LocalName() != attr->mAttr) {
continue;
}
if (attr->mFunction == NS_ATTR_FUNC_SET) {
result = PR_TRUE;
} else {
nsAutoString value;
#ifdef DEBUG
PRBool hasAttr =
#endif
data.mContent->GetAttr(attrName->NamespaceID(),
attrName->LocalName(), value);
NS_ASSERTION(hasAttr, "GetAttrNameAt lied");
result = AttrMatchesValue(attr, value);
}
// 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.mContent->
AttrValueIs(attr->mNameSpace, attr->mAttr, attr->mValue,
attr->mCaseSensitive ? eCaseMatters : eIgnoreCase);
}
else if (!data.mContent->HasAttr(attr->mNameSpace, attr->mAttr)) {
result = PR_FALSE;
}
else if (attr->mFunction != NS_ATTR_FUNC_SET) {
nsAutoString value;
#ifdef DEBUG
PRBool hasAttr =
#endif
data.mContent->GetAttr(attr->mNameSpace, attr->mAttr, value);
NS_ASSERTION(hasAttr, "HasAttr lied");
result = AttrMatchesValue(attr, value);
}
attr = attr->mNext;
} while (attr && result);
}
}
nsAtomList* IDList = aSelector->mIDList;
if (result && IDList) {
// test for ID match
result = PR_FALSE;
if (aAttribute && aAttribute == data.mContent->GetIDAttributeName()) {
result = PR_TRUE;
if (aDependence)
*aDependence = PR_TRUE;
}
else if (nsnull != data.mContentID) {
// case sensitivity: bug 93371
const PRBool isCaseSensitive =
data.mCompatMode != eCompatibility_NavQuirks;
result = PR_TRUE;
if (isCaseSensitive) {
do {
if (IDList->mAtom != data.mContentID) {
result = PR_FALSE;
break;
}
IDList = IDList->mNext;
} while (IDList);
} else {
const char* id1Str;
data.mContentID->GetUTF8String(&id1Str);
nsDependentCString id1(id1Str);
do {
const char* id2Str;
IDList->mAtom->GetUTF8String(&id2Str);
if (!id1.Equals(id2Str, nsCaseInsensitiveCStringComparator())) {
result = PR_FALSE;
break;
}
IDList = IDList->mNext;
} while (IDList);
}
}
}
if (result && aSelector->mClassList) {
// test for class match
if (aAttribute && aAttribute == data.mContent->GetClassAttributeName()) {
result = PR_TRUE;
if (aDependence)
*aDependence = PR_TRUE;
}
else {
// case sensitivity: bug 93371
const PRBool isCaseSensitive =
data.mCompatMode != eCompatibility_NavQuirks;
nsAtomList* classList = aSelector->mClassList;
const nsAttrValue *elementClasses = data.mClasses;
while (nsnull != classList) {
if (!(elementClasses && elementClasses->Contains(classList->mAtom, isCaseSensitive ? eCaseMatters : eIgnoreCase))) {
result = PR_FALSE;
break;
}
classList = classList->mNext;
}
}
}
// 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, aStateMask,
aAttribute, aForStyling, &dependence);
// If the selector does match due to the dependence on aStateMask
// or aAttribute, then we want to keep result true so that the
// final result of SelectorMatches is true. Doing so tells
// StateEnumFunc or AttributeEnumFunc that there is a dependence
// on the state or attribute.
result = result || dependence;
}
}
return result;
}
#undef STATE_CHECK
// Right now, there are four operators:
// PRUnichar(0), 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(0) || ch == PRUnichar('~'))
static PRBool SelectorMatchesTree(RuleProcessorData& aPrevData,
nsCSSSelector* aSelector,
PRBool aForStyling)
{
nsCSSSelector* selector = aSelector;
RuleProcessorData* prevdata = &aPrevData;
while (selector) { // check compound selectors
// 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) {
data = prevdata->mPreviousSiblingData;
if (!data) {
nsIContent* content = prevdata->mContent;
nsIContent* parent = content->GetParent();
if (parent) {
parent->SetFlags(NODE_HAS_SLOW_SELECTOR_NOAPPEND);
PRInt32 index = parent->IndexOf(content);
while (0 <= --index) {
content = parent->GetChildAt(index);
if (content->IsNodeOfType(nsINode::eELEMENT)) {
data = RuleProcessorData::Create(prevdata->mPresContext, content,
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->mContent->GetParent();
// GetParent could return a document fragment; we only want
// element parents.
if (content && content->IsNodeOfType(nsINode::eELEMENT)) {
data = RuleProcessorData::Create(prevdata->mPresContext, content,
prevdata->mRuleWalker,
prevdata->mCompatMode);
prevdata->mParentData = data;
}
}
}
if (! data) {
return PR_FALSE;
}
if (SelectorMatches(*data, selector, 0, nsnull, aForStyling)) {
// 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(0))) {
// 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, aForStyling)) {
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)
{
ElementRuleProcessorData* data = (ElementRuleProcessorData*)aData;
if (SelectorMatches(*data, aSelector, 0, nsnull, PR_TRUE)) {
nsCSSSelector *next = aSelector->mNext;
if (!next || SelectorMatchesTree(*data, next, PR_TRUE)) {
// 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
data->mRuleWalker->Forward(static_cast<nsIStyleRule*>(aRule));
// nsStyleSet will deal with the !important rule
}
}
}
NS_IMETHODIMP
nsCSSRuleProcessor::RulesMatching(ElementRuleProcessorData *aData)
{
NS_PRECONDITION(aData->mContent->IsNodeOfType(nsINode::eELEMENT),
"content must be element");
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
if (cascade) {
cascade->mRuleHash.EnumerateAllRules(aData->mNameSpaceID,
aData->mContentTag,
aData->mContentID,
aData->mClasses,
ContentEnumFunc,
aData);
}
return NS_OK;
}
static void PseudoEnumFunc(nsICSSStyleRule* aRule, nsCSSSelector* aSelector,
void* aData)
{
PseudoRuleProcessorData* data = (PseudoRuleProcessorData*)aData;
NS_ASSERTION(aSelector->mTag == data->mPseudoTag, "RuleHash failure");
PRBool matches = PR_TRUE;
if (data->mComparator)
data->mComparator->PseudoMatches(data->mPseudoTag, aSelector, &matches);
if (matches) {
nsCSSSelector *selector = aSelector->mNext;
if (selector) { // test next selector specially
if (PRUnichar('+') == selector->mOperator) {
return; // not valid here, can't match
}
if (SelectorMatches(*data, selector, 0, nsnull, PR_TRUE)) {
selector = selector->mNext;
}
else {
if (PRUnichar('>') == selector->mOperator) {
return; // immediate parent didn't match
}
}
}
if (selector &&
(! SelectorMatchesTree(*data, selector, PR_TRUE))) {
return; // remaining selectors didn't match
}
// 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
data->mRuleWalker->Forward(static_cast<nsIStyleRule*>(aRule));
// nsStyleSet will deal with the !important rule
}
}
NS_IMETHODIMP
nsCSSRuleProcessor::RulesMatching(PseudoRuleProcessorData* aData)
{
NS_PRECONDITION(!aData->mContent ||
aData->mContent->IsNodeOfType(nsINode::eELEMENT),
"content (if present) must be element");
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
if (cascade) {
cascade->mRuleHash.EnumerateTagRules(aData->mPseudoTag,
PseudoEnumFunc, aData);
}
return NS_OK;
}
inline PRBool
IsSiblingOperator(PRUnichar oper)
{
return oper == PRUnichar('+') || oper == PRUnichar('~');
}
NS_IMETHODIMP
nsCSSRuleProcessor::HasStateDependentStyle(StateRuleProcessorData* aData,
nsReStyleHint* aResult)
{
NS_PRECONDITION(aData->mContent->IsNodeOfType(nsINode::eELEMENT),
"content must be element");
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|.
if (cascade) {
*aResult = nsReStyleHint(0);
nsCSSSelector **iter = cascade->mStateSelectors.Elements(),
**end = iter + cascade->mStateSelectors.Length();
for(; iter != end; ++iter) {
nsCSSSelector* selector = *iter;
nsReStyleHint possibleChange = IsSiblingOperator(selector->mOperator) ?
eReStyle_LaterSiblings : eReStyle_Self;
// If *aResult already includes all the bits of possibleChange,
// don't bother calling SelectorMatches, since even if it returns false
// *aResult won't change.
if ((possibleChange & ~(*aResult)) &&
SelectorMatches(*aData, selector, aData->mStateMask, nsnull, PR_TRUE) &&
SelectorMatchesTree(*aData, selector->mNext, PR_TRUE)) {
*aResult = nsReStyleHint(*aResult | possibleChange);
}
}
}
return NS_OK;
}
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 = IsSiblingOperator(aSelector->mOperator) ?
eReStyle_LaterSiblings : eReStyle_Self;
// 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.
if ((possibleChange & ~(aData->change)) &&
SelectorMatches(*data, aSelector, data->mStateMask, data->mAttribute,
PR_TRUE) &&
SelectorMatchesTree(*data, aSelector->mNext, PR_TRUE)) {
aData->change = nsReStyleHint(aData->change | possibleChange);
}
}
NS_IMETHODIMP
nsCSSRuleProcessor::HasAttributeDependentStyle(AttributeRuleProcessorData* aData,
nsReStyleHint* aResult)
{
NS_PRECONDITION(aData->mContent->IsNodeOfType(nsINode::eELEMENT),
"content must be element");
AttributeEnumData data(aData);
// Since we always have :-moz-any-link (and almost always have :link
// and :visited rules from prefs), rather than hacking AddRule below
// to add |href| to the hash, we'll just handle it here.
if (aData->mAttribute == nsGkAtoms::href &&
aData->mIsHTMLContent &&
(aData->mContentTag == nsGkAtoms::a ||
aData->mContentTag == nsGkAtoms::area ||
aData->mContentTag == nsGkAtoms::link)) {
data.change = nsReStyleHint(data.change | eReStyle_Self);
}
// XXX What about XLinks?
#ifdef MOZ_SVG
// XXX should really check the attribute namespace is XLink
if (aData->mAttribute == nsGkAtoms::href &&
aData->mNameSpaceID == kNameSpaceID_SVG &&
aData->mContentTag == nsGkAtoms::a) {
data.change = nsReStyleHint(data.change | eReStyle_Self);
}
#endif
// XXXbz now that :link and :visited are also states, do we need a
// similar optimization in HasStateDependentStyle?
RuleCascadeData* cascade = GetRuleCascade(aData->mPresContext);
// We do the same thing for attributes that we do for state selectors
// (see HasStateDependentStyle), except that instead of one big list
// we have a hashtable with a per-attribute list.
if (cascade) {
if (aData->mAttribute == aData->mContent->GetIDAttributeName()) {
nsCSSSelector **iter = cascade->mIDSelectors.Elements(),
**end = iter + cascade->mIDSelectors.Length();
for(; iter != end; ++iter) {
AttributeEnumFunc(*iter, &data);
}
}
if (aData->mAttribute == aData->mContent->GetClassAttributeName()) {
nsCSSSelector **iter = cascade->mClassSelectors.Elements(),
**end = iter + cascade->mClassSelectors.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);
}
}
}
*aResult = data.change;
return NS_OK;
}
NS_IMETHODIMP
nsCSSRuleProcessor::MediumFeaturesChanged(nsPresContext* aPresContext,
PRBool* aRulesChanged)
{
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);
}
*aRulesChanged = (old != mRuleCascades);
return NS_OK;
}
// 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) {
if ((pseudoClass->mAtom == nsCSSPseudoClasses::active) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::checked) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::mozDragOver) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::focus) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::hover) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::target) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::link) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::visited) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::enabled) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::disabled) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::mozBroken) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::mozUserDisabled) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::mozSuppressed) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::mozLoading) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::required) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::optional) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::valid) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::invalid) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::inRange) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::outOfRange) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::mozReadOnly) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::mozReadWrite) ||
(pseudoClass->mAtom == nsCSSPseudoClasses::indeterminate) ||
#ifdef MOZ_MATHML
(pseudoClass->mAtom == nsCSSPseudoClasses::mozMathIncrementScriptLevel) ||
#endif
(pseudoClass->mAtom == nsCSSPseudoClasses::defaultPseudo)) {
return PR_TRUE;
}
}
return PR_FALSE;
}
static PRBool
AddRule(RuleValue* aRuleInfo, void* aCascade)
{
RuleCascadeData *cascade = static_cast<RuleCascadeData*>(aCascade);
// Build the rule hash.
cascade->mRuleHash.PrependRule(aRuleInfo);
nsTArray<nsCSSSelector*>* stateArray = &cascade->mStateSelectors;
nsTArray<nsCSSSelector*>* classArray = &cascade->mClassSelectors;
nsTArray<nsCSSSelector*>* idArray = &cascade->mIDSelectors;
for (nsCSSSelector* selector = aRuleInfo->mSelector;
selector; selector = selector->mNext) {
// 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) {
// Build mStateSelectors.
if (IsStateSelector(*negation))
stateArray->AppendElement(selector);
// Build mIDSelectors
if (negation->mIDList) {
idArray->AppendElement(selector);
}
// Build mClassSelectors
if (negation->mClassList) {
classArray->AppendElement(selector);
}
// Build mAttributeSelectors.
for (nsAttrSelector *attr = negation->mAttrList; attr;
attr = attr->mNext) {
nsTArray<nsCSSSelector*> *array = cascade->AttributeListFor(attr->mAttr);
if (!array)
return PR_FALSE;
array->AppendElement(selector);
}
}
}
return PR_TRUE;
}
struct PerWeightData {
PRInt32 mWeight;
RuleValue* mRules; // linked list (reverse 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 PLDHashTableOps gRulesByWeightOps = {
PL_DHashAllocTable,
PL_DHashFreeTable,
HashIntKey,
MatchWeightEntry,
PL_DHashMoveEntryStub,
PL_DHashClearEntryStub,
PL_DHashFinalizeStub,
NULL
};
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;
// 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 (?)
PLArenaPool& mArena;
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 = nsICSSRule::UNKNOWN_RULE;
aRule->GetType(type);
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;
RuleValue *info =
new (data->mArena) RuleValue(styleRule, sel->mSelectors);
// entry->data.mRules must be in backwards order.
info->mNext = entry->data.mRules;
entry->data.mRules = info;
}
}
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::CascadeSheetEnumFunc(nsICSSStyleSheet* aSheet, void* aData)
{
nsCSSStyleSheet* sheet = static_cast<nsCSSStyleSheet*>(aSheet);
CascadeEnumData* data = static_cast<CascadeEnumData*>(aData);
PRBool bSheetApplicable = PR_TRUE;
sheet->GetApplicable(bSheetApplicable);
if (bSheetApplicable &&
sheet->UseForPresentation(data->mPresContext, data->mCacheKey) &&
sheet->mInner) {
nsCSSStyleSheet* child = sheet->mInner->mFirstChild;
while (child) {
CascadeSheetEnumFunc(child, data);
child = child->mNext;
}
if (!sheet->mInner->mOrderedRules.EnumerateForwards(CascadeRuleEnumFunc,
data))
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.Count() != 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 */
if (!mSheets.EnumerateForwards(CascadeSheetEnumFunc, &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 backwards because it's easier to
// build a singly linked list lowest-first that way.
// The primary sort is by weight...
PRUint32 i = weightCount;
while (i > 0) {
--i;
// and the secondary sort is by order. mRules are already backwards.
RuleValue *ruleValue = weightArray[i].mRules;
do {
// Calling |AddRule| reuses mNext!
RuleValue *next = ruleValue->mNext;
if (!AddRule(ruleValue, newCascade))
return; /* out of memory */
ruleValue = next;
} while (ruleValue);
}
// 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");
if (SelectorMatches(aData, sel, 0, nsnull, PR_FALSE)) {
nsCSSSelector* next = sel->mNext;
if (!next || SelectorMatchesTree(aData, next, PR_FALSE)) {
return PR_TRUE;
}
}
aSelectorList = aSelectorList->mNext;
}
return PR_FALSE;
}
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