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e5eb83ac5a
gecko/layout/style/StyleRule.cpp
Kyle Huey e5eb83ac5a Bug 760331: Coalesce data for inline style across nodes. r=bz 
This patch enables sharing of an nsAttrValue's MiscContainer between nodes for style rules.  MiscContainers of type eCSSStyleRule are now refcounted (with some clever struct packing to ensure that the amount of memory allocated for MiscContainer remains unchanged on 32 and 64 bit).  This infrastructure can be used to share most MiscContainer types in the future if we find advantages to sharing other types than just eCSSStyleRuley.  A cache mapping strings to MiscContainers has been added to nsHTMLCSSStyleSheet.  MiscContainers can be shared between nsAttrValues when one nsAttrValue is SetTo another nsAttrValue or when there is a cache hit in this cache.  This patch also adds the ability to tell a style rule that it belongs to an nsHTMLCSSStyleSheet, with appropriate accessor functions to separate that from the existing case of belonging to an nsCSSStyleSheet.

The primary use case is to reduce memory use for pages that have lots of inline style attributes with the same value.  This can happen easily with large pages that are automatically generated.  An (admittedly pathological) testcase in Bug 686975 sees over 250 MB of memory savings with this change.  Reusing the same MiscContainer for multiple nodes saves the overhead of maintaining separate copies of the string containing the serialized value of the style attribute and of creating separate style rules for each node.  Eliminating duplicate style rules enables further savings in layout through style context sharing.  The testcase sees the amount of memory used by style contexts go from over 250 MB to 10 KB.

Because the cache is based on the text value of the style attribute, it will not handle attributes that have different text values but are parsed into identical style rules.  We also do not attempt to share MiscContainers when the node's base URI differs from the document URI.  The effect of these limitations is expected to be low.
2012-09-30 09:40:24 -07:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* representation of CSS style rules (selectors+declaration), CSS
* selectors, and DOM objects for style rules, selectors, and
* declarations
*/
#include "mozilla/css/StyleRule.h"
#include "mozilla/css/GroupRule.h"
#include "mozilla/css/Declaration.h"
#include "nsCSSStyleSheet.h"
#include "mozilla/css/Loader.h"
#include "nsIURL.h"
#include "nsIDocument.h"
#include "nsIAtom.h"
#include "nsCRT.h"
#include "nsString.h"
#include "nsStyleConsts.h"
#include "nsStyleUtil.h"
#include "nsIDOMCSSStyleSheet.h"
#include "nsICSSStyleRuleDOMWrapper.h"
#include "nsIDOMCSSStyleDeclaration.h"
#include "nsDOMCSSDeclaration.h"
#include "nsINameSpaceManager.h"
#include "nsXMLNameSpaceMap.h"
#include "nsRuleNode.h"
#include "nsUnicharUtils.h"
#include "nsCSSPseudoElements.h"
#include "nsIPrincipal.h"
#include "nsComponentManagerUtils.h"
#include "nsCSSPseudoClasses.h"
#include "nsCSSAnonBoxes.h"
#include "nsTArray.h"
#include "nsDOMClassInfoID.h"
#include "nsContentUtils.h"
#include "nsError.h"
#include "mozAutoDocUpdate.h"
#include "prlog.h"
namespace css = mozilla::css;
#define NS_IF_CLONE(member_) \
PR_BEGIN_MACRO \
if (member_) { \
result->member_ = member_->Clone(); \
if (!result->member_) { \
delete result; \
return nullptr; \
} \
} \
PR_END_MACRO
#define NS_IF_DELETE(ptr) \
PR_BEGIN_MACRO \
delete ptr; \
ptr = nullptr; \
PR_END_MACRO
/* ************************************************************************** */
nsAtomList::nsAtomList(nsIAtom* aAtom)
: mAtom(aAtom),
mNext(nullptr)
{
MOZ_COUNT_CTOR(nsAtomList);
}
nsAtomList::nsAtomList(const nsString& aAtomValue)
: mAtom(nullptr),
mNext(nullptr)
{
MOZ_COUNT_CTOR(nsAtomList);
mAtom = do_GetAtom(aAtomValue);
}
nsAtomList*
nsAtomList::Clone(bool aDeep) const
{
nsAtomList *result = new nsAtomList(mAtom);
if (!result)
return nullptr;
if (aDeep)
NS_CSS_CLONE_LIST_MEMBER(nsAtomList, this, mNext, result, (false));
return result;
}
size_t
nsAtomList::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
size_t n = 0;
const nsAtomList* a = this;
while (a) {
n += aMallocSizeOf(a);
// The following members aren't measured:
// - a->mAtom, because it may be shared
a = a->mNext;
}
return n;
}
nsAtomList::~nsAtomList(void)
{
MOZ_COUNT_DTOR(nsAtomList);
NS_CSS_DELETE_LIST_MEMBER(nsAtomList, this, mNext);
}
nsPseudoClassList::nsPseudoClassList(nsCSSPseudoClasses::Type aType)
: mType(aType),
mNext(nullptr)
{
NS_ASSERTION(!nsCSSPseudoClasses::HasStringArg(aType) &&
!nsCSSPseudoClasses::HasNthPairArg(aType),
"unexpected pseudo-class");
MOZ_COUNT_CTOR(nsPseudoClassList);
u.mMemory = nullptr;
}
nsPseudoClassList::nsPseudoClassList(nsCSSPseudoClasses::Type aType,
const PRUnichar* aString)
: mType(aType),
mNext(nullptr)
{
NS_ASSERTION(nsCSSPseudoClasses::HasStringArg(aType),
"unexpected pseudo-class");
NS_ASSERTION(aString, "string expected");
MOZ_COUNT_CTOR(nsPseudoClassList);
u.mString = NS_strdup(aString);
}
nsPseudoClassList::nsPseudoClassList(nsCSSPseudoClasses::Type aType,
const int32_t* aIntPair)
: mType(aType),
mNext(nullptr)
{
NS_ASSERTION(nsCSSPseudoClasses::HasNthPairArg(aType),
"unexpected pseudo-class");
NS_ASSERTION(aIntPair, "integer pair expected");
MOZ_COUNT_CTOR(nsPseudoClassList);
u.mNumbers =
static_cast<int32_t*>(nsMemory::Clone(aIntPair, sizeof(int32_t) * 2));
}
// adopts aSelectorList
nsPseudoClassList::nsPseudoClassList(nsCSSPseudoClasses::Type aType,
nsCSSSelectorList* aSelectorList)
: mType(aType),
mNext(nullptr)
{
NS_ASSERTION(nsCSSPseudoClasses::HasSelectorListArg(aType),
"unexpected pseudo-class");
NS_ASSERTION(aSelectorList, "selector list expected");
MOZ_COUNT_CTOR(nsPseudoClassList);
u.mSelectors = aSelectorList;
}
nsPseudoClassList*
nsPseudoClassList::Clone(bool aDeep) const
{
nsPseudoClassList *result;
if (!u.mMemory) {
result = new nsPseudoClassList(mType);
} else if (nsCSSPseudoClasses::HasStringArg(mType)) {
result = new nsPseudoClassList(mType, u.mString);
} else if (nsCSSPseudoClasses::HasNthPairArg(mType)) {
result = new nsPseudoClassList(mType, u.mNumbers);
} else {
NS_ASSERTION(nsCSSPseudoClasses::HasSelectorListArg(mType),
"unexpected pseudo-class");
// This constructor adopts its selector list argument.
result = new nsPseudoClassList(mType, u.mSelectors->Clone());
}
if (aDeep)
NS_CSS_CLONE_LIST_MEMBER(nsPseudoClassList, this, mNext, result,
(false));
return result;
}
size_t
nsPseudoClassList::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
size_t n = 0;
const nsPseudoClassList* p = this;
while (p) {
n += aMallocSizeOf(p);
if (!p->u.mMemory) {
// do nothing
} else if (nsCSSPseudoClasses::HasStringArg(p->mType)) {
n += aMallocSizeOf(p->u.mString);
} else if (nsCSSPseudoClasses::HasNthPairArg(p->mType)) {
n += aMallocSizeOf(p->u.mNumbers);
} else {
NS_ASSERTION(nsCSSPseudoClasses::HasSelectorListArg(p->mType),
"unexpected pseudo-class");
n += p->u.mSelectors->SizeOfIncludingThis(aMallocSizeOf);
}
p = p->mNext;
}
return n;
}
nsPseudoClassList::~nsPseudoClassList(void)
{
MOZ_COUNT_DTOR(nsPseudoClassList);
if (nsCSSPseudoClasses::HasSelectorListArg(mType)) {
delete u.mSelectors;
} else if (u.mMemory) {
NS_Free(u.mMemory);
}
NS_CSS_DELETE_LIST_MEMBER(nsPseudoClassList, this, mNext);
}
nsAttrSelector::nsAttrSelector(int32_t aNameSpace, const nsString& aAttr)
: mValue(),
mNext(nullptr),
mLowercaseAttr(nullptr),
mCasedAttr(nullptr),
mNameSpace(aNameSpace),
mFunction(NS_ATTR_FUNC_SET),
mCaseSensitive(1)
{
MOZ_COUNT_CTOR(nsAttrSelector);
nsAutoString lowercase;
nsContentUtils::ASCIIToLower(aAttr, lowercase);
mCasedAttr = do_GetAtom(aAttr);
mLowercaseAttr = do_GetAtom(lowercase);
}
nsAttrSelector::nsAttrSelector(int32_t aNameSpace, const nsString& aAttr, uint8_t aFunction,
const nsString& aValue, bool aCaseSensitive)
: mValue(aValue),
mNext(nullptr),
mLowercaseAttr(nullptr),
mCasedAttr(nullptr),
mNameSpace(aNameSpace),
mFunction(aFunction),
mCaseSensitive(aCaseSensitive)
{
MOZ_COUNT_CTOR(nsAttrSelector);
nsAutoString lowercase;
nsContentUtils::ASCIIToLower(aAttr, lowercase);
mCasedAttr = do_GetAtom(aAttr);
mLowercaseAttr = do_GetAtom(lowercase);
}
nsAttrSelector::nsAttrSelector(int32_t aNameSpace, nsIAtom* aLowercaseAttr,
nsIAtom* aCasedAttr, uint8_t aFunction,
const nsString& aValue, bool aCaseSensitive)
: mValue(aValue),
mNext(nullptr),
mLowercaseAttr(aLowercaseAttr),
mCasedAttr(aCasedAttr),
mNameSpace(aNameSpace),
mFunction(aFunction),
mCaseSensitive(aCaseSensitive)
{
MOZ_COUNT_CTOR(nsAttrSelector);
}
nsAttrSelector*
nsAttrSelector::Clone(bool aDeep) const
{
nsAttrSelector *result =
new nsAttrSelector(mNameSpace, mLowercaseAttr, mCasedAttr,
mFunction, mValue, mCaseSensitive);
if (aDeep)
NS_CSS_CLONE_LIST_MEMBER(nsAttrSelector, this, mNext, result, (false));
return result;
}
nsAttrSelector::~nsAttrSelector(void)
{
MOZ_COUNT_DTOR(nsAttrSelector);
NS_CSS_DELETE_LIST_MEMBER(nsAttrSelector, this, mNext);
}
// -- nsCSSSelector -------------------------------
nsCSSSelector::nsCSSSelector(void)
: mLowercaseTag(nullptr),
mCasedTag(nullptr),
mIDList(nullptr),
mClassList(nullptr),
mPseudoClassList(nullptr),
mAttrList(nullptr),
mNegations(nullptr),
mNext(nullptr),
mNameSpace(kNameSpaceID_Unknown),
mOperator(0),
mPseudoType(nsCSSPseudoElements::ePseudo_NotPseudoElement)
{
MOZ_COUNT_CTOR(nsCSSSelector);
MOZ_STATIC_ASSERT(nsCSSPseudoElements::ePseudo_MAX < INT16_MAX,
"nsCSSPseudoElements::Type values overflow mPseudoType");
}
nsCSSSelector*
nsCSSSelector::Clone(bool aDeepNext, bool aDeepNegations) const
{
nsCSSSelector *result = new nsCSSSelector();
if (!result)
return nullptr;
result->mNameSpace = mNameSpace;
result->mLowercaseTag = mLowercaseTag;
result->mCasedTag = mCasedTag;
result->mOperator = mOperator;
result->mPseudoType = mPseudoType;
NS_IF_CLONE(mIDList);
NS_IF_CLONE(mClassList);
NS_IF_CLONE(mPseudoClassList);
NS_IF_CLONE(mAttrList);
// No need to worry about multiple levels of recursion since an
// mNegations can't have an mNext.
NS_ASSERTION(!mNegations || !mNegations->mNext,
"mNegations can't have non-null mNext");
if (aDeepNegations) {
NS_CSS_CLONE_LIST_MEMBER(nsCSSSelector, this, mNegations, result,
(true, false));
}
if (aDeepNext) {
NS_CSS_CLONE_LIST_MEMBER(nsCSSSelector, this, mNext, result,
(false, true));
}
return result;
}
nsCSSSelector::~nsCSSSelector(void)
{
MOZ_COUNT_DTOR(nsCSSSelector);
Reset();
// No need to worry about multiple levels of recursion since an
// mNegations can't have an mNext.
NS_CSS_DELETE_LIST_MEMBER(nsCSSSelector, this, mNext);
}
void nsCSSSelector::Reset(void)
{
mNameSpace = kNameSpaceID_Unknown;
mLowercaseTag = nullptr;
mCasedTag = nullptr;
NS_IF_DELETE(mIDList);
NS_IF_DELETE(mClassList);
NS_IF_DELETE(mPseudoClassList);
NS_IF_DELETE(mAttrList);
// No need to worry about multiple levels of recursion since an
// mNegations can't have an mNext.
NS_ASSERTION(!mNegations || !mNegations->mNext,
"mNegations can't have non-null mNext");
NS_CSS_DELETE_LIST_MEMBER(nsCSSSelector, this, mNegations);
mOperator = PRUnichar(0);
}
void nsCSSSelector::SetNameSpace(int32_t aNameSpace)
{
mNameSpace = aNameSpace;
}
void nsCSSSelector::SetTag(const nsString& aTag)
{
if (aTag.IsEmpty()) {
mLowercaseTag = mCasedTag = nullptr;
return;
}
mCasedTag = do_GetAtom(aTag);
nsAutoString lowercase;
nsContentUtils::ASCIIToLower(aTag, lowercase);
mLowercaseTag = do_GetAtom(lowercase);
}
void nsCSSSelector::AddID(const nsString& aID)
{
if (!aID.IsEmpty()) {
nsAtomList** list = &mIDList;
while (nullptr != *list) {
list = &((*list)->mNext);
}
*list = new nsAtomList(aID);
}
}
void nsCSSSelector::AddClass(const nsString& aClass)
{
if (!aClass.IsEmpty()) {
nsAtomList** list = &mClassList;
while (nullptr != *list) {
list = &((*list)->mNext);
}
*list = new nsAtomList(aClass);
}
}
void nsCSSSelector::AddPseudoClass(nsCSSPseudoClasses::Type aType)
{
AddPseudoClassInternal(new nsPseudoClassList(aType));
}
void nsCSSSelector::AddPseudoClass(nsCSSPseudoClasses::Type aType,
const PRUnichar* aString)
{
AddPseudoClassInternal(new nsPseudoClassList(aType, aString));
}
void nsCSSSelector::AddPseudoClass(nsCSSPseudoClasses::Type aType,
const int32_t* aIntPair)
{
AddPseudoClassInternal(new nsPseudoClassList(aType, aIntPair));
}
void nsCSSSelector::AddPseudoClass(nsCSSPseudoClasses::Type aType,
nsCSSSelectorList* aSelectorList)
{
// Take ownership of nsCSSSelectorList instead of copying.
AddPseudoClassInternal(new nsPseudoClassList(aType, aSelectorList));
}
void nsCSSSelector::AddPseudoClassInternal(nsPseudoClassList *aPseudoClass)
{
nsPseudoClassList** list = &mPseudoClassList;
while (nullptr != *list) {
list = &((*list)->mNext);
}
*list = aPseudoClass;
}
void nsCSSSelector::AddAttribute(int32_t aNameSpace, const nsString& aAttr)
{
if (!aAttr.IsEmpty()) {
nsAttrSelector** list = &mAttrList;
while (nullptr != *list) {
list = &((*list)->mNext);
}
*list = new nsAttrSelector(aNameSpace, aAttr);
}
}
void nsCSSSelector::AddAttribute(int32_t aNameSpace, const nsString& aAttr, uint8_t aFunc,
const nsString& aValue, bool aCaseSensitive)
{
if (!aAttr.IsEmpty()) {
nsAttrSelector** list = &mAttrList;
while (nullptr != *list) {
list = &((*list)->mNext);
}
*list = new nsAttrSelector(aNameSpace, aAttr, aFunc, aValue, aCaseSensitive);
}
}
void nsCSSSelector::SetOperator(PRUnichar aOperator)
{
mOperator = aOperator;
}
int32_t nsCSSSelector::CalcWeightWithoutNegations() const
{
int32_t weight = 0;
if (nullptr != mLowercaseTag) {
weight += 0x000001;
}
nsAtomList* list = mIDList;
while (nullptr != list) {
weight += 0x010000;
list = list->mNext;
}
list = mClassList;
while (nullptr != list) {
weight += 0x000100;
list = list->mNext;
}
// FIXME (bug 561154): This is incorrect for :-moz-any(), which isn't
// really a pseudo-class. In order to handle :-moz-any() correctly,
// we need to compute specificity after we match, based on which
// option we matched with (and thus also need to try the
// highest-specificity options first).
nsPseudoClassList *plist = mPseudoClassList;
while (nullptr != plist) {
weight += 0x000100;
plist = plist->mNext;
}
nsAttrSelector* attr = mAttrList;
while (nullptr != attr) {
weight += 0x000100;
attr = attr->mNext;
}
return weight;
}
int32_t nsCSSSelector::CalcWeight() const
{
// Loop over this selector and all its negations.
int32_t weight = 0;
for (const nsCSSSelector *n = this; n; n = n->mNegations) {
weight += n->CalcWeightWithoutNegations();
}
return weight;
}
//
// Builds the textual representation of a selector. Called by DOM 2 CSS
// StyleRule:selectorText
//
void
nsCSSSelector::ToString(nsAString& aString, nsCSSStyleSheet* aSheet,
bool aAppend) const
{
if (!aAppend)
aString.Truncate();
// selectors are linked from right-to-left, so the next selector in
// the linked list actually precedes this one in the resulting string
nsAutoTArray<const nsCSSSelector*, 8> stack;
for (const nsCSSSelector *s = this; s; s = s->mNext) {
stack.AppendElement(s);
}
while (!stack.IsEmpty()) {
uint32_t index = stack.Length() - 1;
const nsCSSSelector *s = stack.ElementAt(index);
stack.RemoveElementAt(index);
s->AppendToStringWithoutCombinators(aString, aSheet);
// Append the combinator, if needed.
if (!stack.IsEmpty()) {
const nsCSSSelector *next = stack.ElementAt(index - 1);
PRUnichar oper = s->mOperator;
if (next->IsPseudoElement()) {
NS_ASSERTION(oper == PRUnichar('>'),
"improperly chained pseudo element");
} else {
NS_ASSERTION(oper != PRUnichar(0),
"compound selector without combinator");
aString.Append(PRUnichar(' '));
if (oper != PRUnichar(' ')) {
aString.Append(oper);
aString.Append(PRUnichar(' '));
}
}
}
}
}
void
nsCSSSelector::AppendToStringWithoutCombinators
(nsAString& aString, nsCSSStyleSheet* aSheet) const
{
AppendToStringWithoutCombinatorsOrNegations(aString, aSheet, false);
for (const nsCSSSelector* negation = mNegations; negation;
negation = negation->mNegations) {
aString.AppendLiteral(":not(");
negation->AppendToStringWithoutCombinatorsOrNegations(aString, aSheet,
true);
aString.Append(PRUnichar(')'));
}
}
void
nsCSSSelector::AppendToStringWithoutCombinatorsOrNegations
(nsAString& aString, nsCSSStyleSheet* aSheet,
bool aIsNegated) const
{
nsAutoString temp;
bool isPseudoElement = IsPseudoElement();
// For non-pseudo-element selectors or for lone pseudo-elements, deal with
// namespace prefixes.
bool wroteNamespace = false;
if (!isPseudoElement || !mNext) {
// append the namespace prefix if needed
nsXMLNameSpaceMap *sheetNS = aSheet ? aSheet->GetNameSpaceMap() : nullptr;
// sheetNS is non-null if and only if we had an @namespace rule. If it's
// null, that means that the only namespaces we could have are the
// wildcard namespace (which can be implicit in this case) and the "none"
// namespace, which then needs to be explicitly specified.
if (!sheetNS) {
NS_ASSERTION(mNameSpace == kNameSpaceID_Unknown ||
mNameSpace == kNameSpaceID_None,
"How did we get this namespace?");
if (mNameSpace == kNameSpaceID_None) {
aString.Append(PRUnichar('|'));
wroteNamespace = true;
}
} else if (sheetNS->FindNameSpaceID(nullptr) == mNameSpace) {
// We have the default namespace (possibly including the wildcard
// namespace). Do nothing.
NS_ASSERTION(mNameSpace == kNameSpaceID_Unknown ||
CanBeNamespaced(aIsNegated),
"How did we end up with this namespace?");
} else if (mNameSpace == kNameSpaceID_None) {
NS_ASSERTION(CanBeNamespaced(aIsNegated),
"How did we end up with this namespace?");
aString.Append(PRUnichar('|'));
wroteNamespace = true;
} else if (mNameSpace != kNameSpaceID_Unknown) {
NS_ASSERTION(CanBeNamespaced(aIsNegated),
"How did we end up with this namespace?");
nsIAtom *prefixAtom = sheetNS->FindPrefix(mNameSpace);
NS_ASSERTION(prefixAtom, "how'd we get a non-default namespace "
"without a prefix?");
nsStyleUtil::AppendEscapedCSSIdent(nsDependentAtomString(prefixAtom),
aString);
aString.Append(PRUnichar('|'));
wroteNamespace = true;
} else {
// A selector for an element in any namespace, while the default
// namespace is something else. :not() is special in that the default
// namespace is not implied for non-type selectors, so if this is a
// negated non-type selector we don't need to output an explicit wildcard
// namespace here, since those default to a wildcard namespace.
if (CanBeNamespaced(aIsNegated)) {
aString.AppendLiteral("*|");
wroteNamespace = true;
}
}
}
if (!mLowercaseTag) {
// Universal selector: avoid writing the universal selector when we
// can avoid it, especially since we're required to avoid it for the
// inside of :not()
if (wroteNamespace ||
(!mIDList && !mClassList && !mPseudoClassList && !mAttrList &&
(aIsNegated || !mNegations))) {
aString.Append(PRUnichar('*'));
}
} else {
// Append the tag name
nsAutoString tag;
(isPseudoElement ? mLowercaseTag : mCasedTag)->ToString(tag);
if (isPseudoElement) {
if (!mNext) {
// Lone pseudo-element selector -- toss in a wildcard type selector
// XXXldb Why?
aString.Append(PRUnichar('*'));
}
if (!nsCSSPseudoElements::IsCSS2PseudoElement(mLowercaseTag)) {
aString.Append(PRUnichar(':'));
}
// This should not be escaped since (a) the pseudo-element string
// has a ":" that can't be escaped and (b) all pseudo-elements at
// this point are known, and therefore we know they don't need
// escaping.
aString.Append(tag);
} else {
nsStyleUtil::AppendEscapedCSSIdent(tag, aString);
}
}
// Append the id, if there is one
if (mIDList) {
nsAtomList* list = mIDList;
while (list != nullptr) {
list->mAtom->ToString(temp);
aString.Append(PRUnichar('#'));
nsStyleUtil::AppendEscapedCSSIdent(temp, aString);
list = list->mNext;
}
}
// Append each class in the linked list
if (mClassList) {
if (isPseudoElement) {
#ifdef MOZ_XUL
NS_ABORT_IF_FALSE(nsCSSAnonBoxes::IsTreePseudoElement(mLowercaseTag),
"must be tree pseudo-element");
aString.Append(PRUnichar('('));
for (nsAtomList* list = mClassList; list; list = list->mNext) {
nsStyleUtil::AppendEscapedCSSIdent(nsDependentAtomString(list->mAtom), aString);
aString.Append(PRUnichar(','));
}
// replace the final comma with a close-paren
aString.Replace(aString.Length() - 1, 1, PRUnichar(')'));
#else
NS_ERROR("Can't happen");
#endif
} else {
nsAtomList* list = mClassList;
while (list != nullptr) {
list->mAtom->ToString(temp);
aString.Append(PRUnichar('.'));
nsStyleUtil::AppendEscapedCSSIdent(temp, aString);
list = list->mNext;
}
}
}
// Append each attribute selector in the linked list
if (mAttrList) {
nsAttrSelector* list = mAttrList;
while (list != nullptr) {
aString.Append(PRUnichar('['));
// Append the namespace prefix
if (list->mNameSpace == kNameSpaceID_Unknown) {
aString.Append(PRUnichar('*'));
aString.Append(PRUnichar('|'));
} else if (list->mNameSpace != kNameSpaceID_None) {
if (aSheet) {
nsXMLNameSpaceMap *sheetNS = aSheet->GetNameSpaceMap();
nsIAtom *prefixAtom = sheetNS->FindPrefix(list->mNameSpace);
// Default namespaces don't apply to attribute selectors, so
// we must have a useful prefix.
NS_ASSERTION(prefixAtom,
"How did we end up with a namespace if the prefix "
"is unknown?");
nsAutoString prefix;
prefixAtom->ToString(prefix);
nsStyleUtil::AppendEscapedCSSIdent(prefix, aString);
aString.Append(PRUnichar('|'));
}
}
// Append the attribute name
list->mCasedAttr->ToString(temp);
nsStyleUtil::AppendEscapedCSSIdent(temp, aString);
if (list->mFunction != NS_ATTR_FUNC_SET) {
// Append the function
if (list->mFunction == NS_ATTR_FUNC_INCLUDES)
aString.Append(PRUnichar('~'));
else if (list->mFunction == NS_ATTR_FUNC_DASHMATCH)
aString.Append(PRUnichar('|'));
else if (list->mFunction == NS_ATTR_FUNC_BEGINSMATCH)
aString.Append(PRUnichar('^'));
else if (list->mFunction == NS_ATTR_FUNC_ENDSMATCH)
aString.Append(PRUnichar('$'));
else if (list->mFunction == NS_ATTR_FUNC_CONTAINSMATCH)
aString.Append(PRUnichar('*'));
aString.Append(PRUnichar('='));
// Append the value
nsStyleUtil::AppendEscapedCSSString(list->mValue, aString);
}
aString.Append(PRUnichar(']'));
list = list->mNext;
}
}
// Append each pseudo-class in the linked list
for (nsPseudoClassList* list = mPseudoClassList; list; list = list->mNext) {
nsCSSPseudoClasses::PseudoTypeToString(list->mType, temp);
// This should not be escaped since (a) the pseudo-class string
// has a ":" that can't be escaped and (b) all pseudo-classes at
// this point are known, and therefore we know they don't need
// escaping.
aString.Append(temp);
if (list->u.mMemory) {
aString.Append(PRUnichar('('));
if (nsCSSPseudoClasses::HasStringArg(list->mType)) {
nsStyleUtil::AppendEscapedCSSIdent(
nsDependentString(list->u.mString), aString);
} else if (nsCSSPseudoClasses::HasNthPairArg(list->mType)) {
int32_t a = list->u.mNumbers[0],
b = list->u.mNumbers[1];
temp.Truncate();
if (a != 0) {
if (a == -1) {
temp.Append(PRUnichar('-'));
} else if (a != 1) {
temp.AppendInt(a);
}
temp.Append(PRUnichar('n'));
}
if (b != 0 || a == 0) {
if (b >= 0 && a != 0) // check a != 0 for whether we printed above
temp.Append(PRUnichar('+'));
temp.AppendInt(b);
}
aString.Append(temp);
} else {
NS_ASSERTION(nsCSSPseudoClasses::HasSelectorListArg(list->mType),
"unexpected pseudo-class");
nsString tmp;
list->u.mSelectors->ToString(tmp, aSheet);
aString.Append(tmp);
}
aString.Append(PRUnichar(')'));
}
}
}
bool
nsCSSSelector::CanBeNamespaced(bool aIsNegated) const
{
return !aIsNegated ||
(!mIDList && !mClassList && !mPseudoClassList && !mAttrList);
}
size_t
nsCSSSelector::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
size_t n = 0;
const nsCSSSelector* s = this;
while (s) {
n += aMallocSizeOf(s);
#define MEASURE(x) n += x ? x->SizeOfIncludingThis(aMallocSizeOf) : 0;
MEASURE(s->mIDList);
MEASURE(s->mClassList);
MEASURE(s->mPseudoClassList);
MEASURE(s->mNegations);
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - s->mAttrList
//
// The following members aren't measured:
// - s->mLowercaseTag, because it's an atom and therefore shared
// - s->mCasedTag, because it's an atom and therefore shared
s = s->mNext;
}
return n;
}
// -- nsCSSSelectorList -------------------------------
nsCSSSelectorList::nsCSSSelectorList(void)
: mSelectors(nullptr),
mWeight(0),
mNext(nullptr)
{
MOZ_COUNT_CTOR(nsCSSSelectorList);
}
nsCSSSelectorList::~nsCSSSelectorList()
{
MOZ_COUNT_DTOR(nsCSSSelectorList);
delete mSelectors;
NS_CSS_DELETE_LIST_MEMBER(nsCSSSelectorList, this, mNext);
}
nsCSSSelector*
nsCSSSelectorList::AddSelector(PRUnichar aOperator)
{
nsCSSSelector* newSel = new nsCSSSelector();
if (mSelectors) {
NS_ASSERTION(aOperator != PRUnichar(0), "chaining without combinator");
mSelectors->SetOperator(aOperator);
} else {
NS_ASSERTION(aOperator == PRUnichar(0), "combinator without chaining");
}
newSel->mNext = mSelectors;
mSelectors = newSel;
return newSel;
}
void
nsCSSSelectorList::ToString(nsAString& aResult, nsCSSStyleSheet* aSheet)
{
aResult.Truncate();
nsCSSSelectorList *p = this;
for (;;) {
p->mSelectors->ToString(aResult, aSheet, true);
p = p->mNext;
if (!p)
break;
aResult.AppendLiteral(", ");
}
}
nsCSSSelectorList*
nsCSSSelectorList::Clone(bool aDeep) const
{
nsCSSSelectorList *result = new nsCSSSelectorList();
result->mWeight = mWeight;
NS_IF_CLONE(mSelectors);
if (aDeep) {
NS_CSS_CLONE_LIST_MEMBER(nsCSSSelectorList, this, mNext, result,
(false));
}
return result;
}
size_t
nsCSSSelectorList::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
size_t n = 0;
const nsCSSSelectorList* s = this;
while (s) {
n += aMallocSizeOf(s);
n += s->mSelectors ? s->mSelectors->SizeOfIncludingThis(aMallocSizeOf) : 0;
s = s->mNext;
}
return n;
}
// -- ImportantRule ----------------------------------
namespace mozilla {
namespace css {
ImportantRule::ImportantRule(Declaration* aDeclaration)
: mDeclaration(aDeclaration)
{
}
ImportantRule::~ImportantRule()
{
}
NS_IMPL_ISUPPORTS1(ImportantRule, nsIStyleRule)
/* virtual */ void
ImportantRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
mDeclaration->MapImportantRuleInfoInto(aRuleData);
}
#ifdef DEBUG
/* virtual */ void
ImportantRule::List(FILE* out, int32_t aIndent) const
{
// Indent
for (int32_t index = aIndent; --index >= 0; ) fputs(" ", out);
fprintf(out, "! Important declaration=%p\n",
static_cast<void*>(mDeclaration));
}
#endif
} // namespace css
} // namespace mozilla
// --------------------------------------------------------
namespace mozilla {
namespace css {
class DOMCSSStyleRule;
}
}
class DOMCSSDeclarationImpl : public nsDOMCSSDeclaration
{
public:
DOMCSSDeclarationImpl(css::StyleRule *aRule);
virtual ~DOMCSSDeclarationImpl(void);
NS_IMETHOD GetParentRule(nsIDOMCSSRule **aParent);
void DropReference(void);
virtual css::Declaration* GetCSSDeclaration(bool aAllocate);
virtual nsresult SetCSSDeclaration(css::Declaration* aDecl);
virtual void GetCSSParsingEnvironment(CSSParsingEnvironment& aCSSParseEnv);
virtual nsIDocument* DocToUpdate();
// Override |AddRef| and |Release| for being a member of
// |DOMCSSStyleRule|. Also, we need to forward QI for cycle
// collection things to DOMCSSStyleRule.
NS_DECL_ISUPPORTS_INHERITED
virtual nsINode *GetParentObject()
{
return mRule ? mRule->GetDocument() : nullptr;
}
friend class css::DOMCSSStyleRule;
protected:
// This reference is not reference-counted. The rule object tells us
// when it's about to go away.
css::StyleRule *mRule;
inline css::DOMCSSStyleRule* DomRule();
private:
// NOT TO BE IMPLEMENTED
// This object cannot be allocated on its own. It must be a member of
// DOMCSSStyleRule.
void* operator new(size_t size) CPP_THROW_NEW;
};
namespace mozilla {
namespace css {
class DOMCSSStyleRule : public nsICSSStyleRuleDOMWrapper
{
public:
DOMCSSStyleRule(StyleRule *aRule);
virtual ~DOMCSSStyleRule();
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(DOMCSSStyleRule)
NS_DECL_NSIDOMCSSRULE
NS_DECL_NSIDOMCSSSTYLERULE
// nsICSSStyleRuleDOMWrapper
NS_IMETHOD GetCSSStyleRule(StyleRule **aResult);
DOMCSSDeclarationImpl* DOMDeclaration() { return &mDOMDeclaration; }
friend class ::DOMCSSDeclarationImpl;
protected:
DOMCSSDeclarationImpl mDOMDeclaration;
StyleRule* Rule() {
return mDOMDeclaration.mRule;
}
};
} // namespace css
} // namespace mozilla
DOMCSSDeclarationImpl::DOMCSSDeclarationImpl(css::StyleRule *aRule)
: mRule(aRule)
{
MOZ_COUNT_CTOR(DOMCSSDeclarationImpl);
}
DOMCSSDeclarationImpl::~DOMCSSDeclarationImpl(void)
{
NS_ASSERTION(!mRule, "DropReference not called.");
MOZ_COUNT_DTOR(DOMCSSDeclarationImpl);
}
inline css::DOMCSSStyleRule* DOMCSSDeclarationImpl::DomRule()
{
return reinterpret_cast<css::DOMCSSStyleRule*>
(reinterpret_cast<char*>(this) -
offsetof(css::DOMCSSStyleRule, mDOMDeclaration));
}
NS_IMPL_ADDREF_USING_AGGREGATOR(DOMCSSDeclarationImpl, DomRule())
NS_IMPL_RELEASE_USING_AGGREGATOR(DOMCSSDeclarationImpl, DomRule())
NS_INTERFACE_MAP_BEGIN(DOMCSSDeclarationImpl)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
// We forward the cycle collection interfaces to DomRule(), which is
// never null (in fact, we're part of that object!)
if (aIID.Equals(NS_GET_IID(nsCycleCollectionISupports)) ||
aIID.Equals(NS_GET_IID(nsXPCOMCycleCollectionParticipant))) {
return DomRule()->QueryInterface(aIID, aInstancePtr);
}
else
NS_IMPL_QUERY_TAIL_INHERITING(nsDOMCSSDeclaration)
void
DOMCSSDeclarationImpl::DropReference(void)
{
mRule = nullptr;
}
css::Declaration*
DOMCSSDeclarationImpl::GetCSSDeclaration(bool aAllocate)
{
if (mRule) {
return mRule->GetDeclaration();
} else {
return nullptr;
}
}
void
DOMCSSDeclarationImpl::GetCSSParsingEnvironment(CSSParsingEnvironment& aCSSParseEnv)
{
GetCSSParsingEnvironmentForRule(mRule, aCSSParseEnv);
}
NS_IMETHODIMP
DOMCSSDeclarationImpl::GetParentRule(nsIDOMCSSRule **aParent)
{
NS_ENSURE_ARG_POINTER(aParent);
if (!mRule) {
*aParent = nullptr;
return NS_OK;
}
NS_IF_ADDREF(*aParent = mRule->GetDOMRule());
return NS_OK;
}
nsresult
DOMCSSDeclarationImpl::SetCSSDeclaration(css::Declaration* aDecl)
{
NS_PRECONDITION(mRule,
"can only be called when |GetCSSDeclaration| returned a declaration");
nsCOMPtr<nsIDocument> owningDoc;
nsCOMPtr<nsIStyleSheet> sheet = mRule->GetStyleSheet();
if (sheet) {
owningDoc = sheet->GetOwningDocument();
}
mozAutoDocUpdate updateBatch(owningDoc, UPDATE_STYLE, true);
nsRefPtr<css::StyleRule> oldRule = mRule;
mRule = oldRule->DeclarationChanged(aDecl, true).get();
if (!mRule)
return NS_ERROR_OUT_OF_MEMORY;
nsrefcnt cnt = mRule->Release();
if (cnt == 0) {
NS_NOTREACHED("container didn't take ownership");
mRule = nullptr;
return NS_ERROR_UNEXPECTED;
}
if (owningDoc) {
owningDoc->StyleRuleChanged(sheet, oldRule, mRule);
}
return NS_OK;
}
nsIDocument*
DOMCSSDeclarationImpl::DocToUpdate()
{
return nullptr;
}
// needs to be outside the namespace
DOMCI_DATA(CSSStyleRule, css::DOMCSSStyleRule)
namespace mozilla {
namespace css {
DOMCSSStyleRule::DOMCSSStyleRule(StyleRule* aRule)
: mDOMDeclaration(aRule)
{
}
DOMCSSStyleRule::~DOMCSSStyleRule()
{
}
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DOMCSSStyleRule)
NS_INTERFACE_MAP_ENTRY(nsICSSStyleRuleDOMWrapper)
NS_INTERFACE_MAP_ENTRY(nsIDOMCSSStyleRule)
NS_INTERFACE_MAP_ENTRY(nsIDOMCSSRule)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(CSSStyleRule)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(DOMCSSStyleRule)
NS_IMPL_CYCLE_COLLECTING_RELEASE(DOMCSSStyleRule)
NS_IMPL_CYCLE_COLLECTION_CLASS(DOMCSSStyleRule)
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMCSSStyleRule)
// Trace the wrapper for our declaration. This just expands out
// NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER which we can't use
// directly because the wrapper is on the declaration, not on us.
nsContentUtils::TraceWrapper(tmp->DOMDeclaration(), aCallback, aClosure);
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMCSSStyleRule)
// Unlink the wrapper for our declaraton. This just expands out
// NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER which we can't use
// directly because the wrapper is on the declaration, not on us.
nsContentUtils::ReleaseWrapper(s, tmp->DOMDeclaration());
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMCSSStyleRule)
// Just NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS here: that will call
// into our Trace hook, where we do the right thing with declarations
// already.
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMETHODIMP
DOMCSSStyleRule::GetType(uint16_t* aType)
{
*aType = nsIDOMCSSRule::STYLE_RULE;
return NS_OK;
}
NS_IMETHODIMP
DOMCSSStyleRule::GetCssText(nsAString& aCssText)
{
if (!Rule()) {
aCssText.Truncate();
} else {
Rule()->GetCssText(aCssText);
}
return NS_OK;
}
NS_IMETHODIMP
DOMCSSStyleRule::SetCssText(const nsAString& aCssText)
{
if (Rule()) {
Rule()->SetCssText(aCssText);
}
return NS_OK;
}
NS_IMETHODIMP
DOMCSSStyleRule::GetParentStyleSheet(nsIDOMCSSStyleSheet** aSheet)
{
if (!Rule()) {
*aSheet = nullptr;
return NS_OK;
}
return Rule()->GetParentStyleSheet(aSheet);
}
NS_IMETHODIMP
DOMCSSStyleRule::GetParentRule(nsIDOMCSSRule** aParentRule)
{
if (!Rule()) {
*aParentRule = nullptr;
return NS_OK;
}
return Rule()->GetParentRule(aParentRule);
}
NS_IMETHODIMP
DOMCSSStyleRule::GetSelectorText(nsAString& aSelectorText)
{
if (!Rule()) {
aSelectorText.Truncate();
} else {
Rule()->GetSelectorText(aSelectorText);
}
return NS_OK;
}
NS_IMETHODIMP
DOMCSSStyleRule::SetSelectorText(const nsAString& aSelectorText)
{
if (Rule()) {
Rule()->SetSelectorText(aSelectorText);
}
return NS_OK;
}
NS_IMETHODIMP
DOMCSSStyleRule::GetStyle(nsIDOMCSSStyleDeclaration** aStyle)
{
*aStyle = &mDOMDeclaration;
NS_ADDREF(*aStyle);
return NS_OK;
}
NS_IMETHODIMP
DOMCSSStyleRule::GetCSSStyleRule(StyleRule **aResult)
{
*aResult = Rule();
NS_IF_ADDREF(*aResult);
return NS_OK;
}
} // namespace css
} // namespace mozilla
// -- StyleRule ------------------------------------
namespace mozilla {
namespace css {
StyleRule::StyleRule(nsCSSSelectorList* aSelector,
Declaration* aDeclaration)
: Rule(),
mSelector(aSelector),
mDeclaration(aDeclaration),
mImportantRule(nullptr),
mDOMRule(nullptr),
mLineNumber(0),
mWasMatched(false)
{
NS_PRECONDITION(aDeclaration, "must have a declaration");
}
// for |Clone|
StyleRule::StyleRule(const StyleRule& aCopy)
: Rule(aCopy),
mSelector(aCopy.mSelector ? aCopy.mSelector->Clone() : nullptr),
mDeclaration(new Declaration(*aCopy.mDeclaration)),
mImportantRule(nullptr),
mDOMRule(nullptr),
mLineNumber(aCopy.mLineNumber),
mWasMatched(false)
{
// rest is constructed lazily on existing data
}
// for |SetCSSDeclaration|
StyleRule::StyleRule(StyleRule& aCopy,
Declaration* aDeclaration)
: Rule(aCopy),
mSelector(aCopy.mSelector),
mDeclaration(aDeclaration),
mImportantRule(nullptr),
mDOMRule(aCopy.mDOMRule),
mLineNumber(aCopy.mLineNumber),
mWasMatched(false)
{
// The DOM rule is replacing |aCopy| with |this|, so transfer
// the reverse pointer as well (and transfer ownership).
aCopy.mDOMRule = nullptr;
// Similarly for the selector.
aCopy.mSelector = nullptr;
// We are probably replacing the old declaration with |aDeclaration|
// instead of taking ownership of the old declaration; only null out
// aCopy.mDeclaration if we are taking ownership.
if (mDeclaration == aCopy.mDeclaration) {
// This should only ever happen if the declaration was modifiable.
mDeclaration->AssertMutable();
aCopy.mDeclaration = nullptr;
}
}
StyleRule::~StyleRule()
{
delete mSelector;
delete mDeclaration;
NS_IF_RELEASE(mImportantRule);
if (mDOMRule) {
mDOMRule->DOMDeclaration()->DropReference();
NS_RELEASE(mDOMRule);
}
}
// QueryInterface implementation for StyleRule
NS_INTERFACE_MAP_BEGIN(StyleRule)
if (aIID.Equals(NS_GET_IID(mozilla::css::StyleRule))) {
*aInstancePtr = this;
NS_ADDREF_THIS();
return NS_OK;
}
else
NS_INTERFACE_MAP_ENTRY(nsIStyleRule)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIStyleRule)
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF_INHERITED(StyleRule, Rule)
NS_IMPL_RELEASE_INHERITED(StyleRule, Rule)
void
StyleRule::RuleMatched()
{
if (!mWasMatched) {
NS_ABORT_IF_FALSE(!mImportantRule, "should not have important rule yet");
mWasMatched = true;
mDeclaration->SetImmutable();
if (mDeclaration->HasImportantData()) {
NS_ADDREF(mImportantRule = new ImportantRule(mDeclaration));
}
}
}
/* virtual */ int32_t
StyleRule::GetType() const
{
return Rule::STYLE_RULE;
}
/* virtual */ already_AddRefed<Rule>
StyleRule::Clone() const
{
nsRefPtr<Rule> clone = new StyleRule(*this);
return clone.forget();
}
/* virtual */ nsIDOMCSSRule*
StyleRule::GetDOMRule()
{
if (!GetStyleSheet()) {
// inline style rules aren't supposed to have a DOM rule object, only
// a declaration.
return nullptr;
}
if (!mDOMRule) {
mDOMRule = new DOMCSSStyleRule(this);
NS_ADDREF(mDOMRule);
}
return mDOMRule;
}
/* virtual */ already_AddRefed<StyleRule>
StyleRule::DeclarationChanged(Declaration* aDecl,
bool aHandleContainer)
{
StyleRule* clone = new StyleRule(*this, aDecl);
if (!clone) {
return nullptr;
}
NS_ADDREF(clone); // for return
if (aHandleContainer) {
nsCSSStyleSheet* sheet = GetStyleSheet();
if (mParentRule) {
if (sheet) {
sheet->ReplaceRuleInGroup(mParentRule, this, clone);
} else {
mParentRule->ReplaceStyleRule(this, clone);
}
} else if (sheet) {
sheet->ReplaceStyleRule(this, clone);
}
}
return clone;
}
/* virtual */ void
StyleRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
NS_ABORT_IF_FALSE(mWasMatched,
"somebody forgot to call css::StyleRule::RuleMatched");
mDeclaration->MapNormalRuleInfoInto(aRuleData);
}
#ifdef DEBUG
/* virtual */ void
StyleRule::List(FILE* out, int32_t aIndent) const
{
// Indent
for (int32_t index = aIndent; --index >= 0; ) fputs(" ", out);
nsAutoString buffer;
if (mSelector)
mSelector->ToString(buffer, GetStyleSheet());
buffer.AppendLiteral(" ");
fputs(NS_LossyConvertUTF16toASCII(buffer).get(), out);
if (nullptr != mDeclaration) {
mDeclaration->List(out);
}
else {
fputs("{ null declaration }", out);
}
fputs("\n", out);
}
#endif
void
StyleRule::GetCssText(nsAString& aCssText)
{
if (mSelector) {
mSelector->ToString(aCssText, GetStyleSheet());
aCssText.Append(PRUnichar(' '));
}
aCssText.Append(PRUnichar('{'));
aCssText.Append(PRUnichar(' '));
if (mDeclaration)
{
nsAutoString tempString;
mDeclaration->ToString( tempString );
aCssText.Append( tempString );
}
aCssText.Append(PRUnichar(' '));
aCssText.Append(PRUnichar('}'));
}
void
StyleRule::SetCssText(const nsAString& aCssText)
{
// XXX TBI - need to re-parse rule & declaration
}
void
StyleRule::GetSelectorText(nsAString& aSelectorText)
{
if (mSelector)
mSelector->ToString(aSelectorText, GetStyleSheet());
else
aSelectorText.Truncate();
}
void
StyleRule::SetSelectorText(const nsAString& aSelectorText)
{
// XXX TBI - get a parser and re-parse the selectors,
// XXX then need to re-compute the cascade
// XXX and dirty sheet
}
/* virtual */ size_t
StyleRule::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
size_t n = aMallocSizeOf(this);
n += mSelector ? mSelector->SizeOfIncludingThis(aMallocSizeOf) : 0;
n += mDeclaration ? mDeclaration->SizeOfIncludingThis(aMallocSizeOf) : 0;
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - mImportantRule;
// - mDOMRule;
return n;
}
} // namespace css
} // namespace mozilla
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