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gecko-dev
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gecko-dev/layout/style/StyleRule.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/DeclarationBlockInlines.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/css/GroupRule.h"
#include "mozilla/css/Declaration.h"
#include "mozilla/dom/CSSStyleRuleBinding.h"
#include "nsIDocument.h"
#include "nsAtom.h"
#include "nsString.h"
#include "nsStyleUtil.h"
#include "nsDOMCSSDeclaration.h"
#include "nsNameSpaceManager.h"
#include "nsXMLNameSpaceMap.h"
#include "nsCSSPseudoClasses.h"
#include "nsCSSAnonBoxes.h"
#include "nsTArray.h"
#include "nsContentUtils.h"
#include "nsError.h"
#include "mozAutoDocUpdate.h"
#include "nsRuleProcessorData.h"
class nsIDOMCSSStyleDeclaration;
class nsIDOMCSSStyleSheet;
using namespace mozilla;
#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(nsAtom* aAtom)
: mAtom(aAtom),
mNext(nullptr)
{
MOZ_COUNT_CTOR(nsAtomList);
}
nsAtomList::nsAtomList(const nsString& aAtomValue)
: mAtom(nullptr),
mNext(nullptr)
{
MOZ_COUNT_CTOR(nsAtomList);
mAtom = NS_Atomize(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(mozilla::MallocSizeOf 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(CSSPseudoClassType 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(CSSPseudoClassType aType,
const char16_t* 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(CSSPseudoClassType 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(CSSPseudoClassType 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(mozilla::MallocSizeOf 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) {
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),
// mValueCaseSensitivity doesn't matter; we have no value.
mValueCaseSensitivity(ValueCaseSensitivity::CaseSensitive)
{
MOZ_COUNT_CTOR(nsAttrSelector);
nsAutoString lowercase;
nsContentUtils::ASCIIToLower(aAttr, lowercase);
mCasedAttr = NS_Atomize(aAttr);
mLowercaseAttr = NS_Atomize(lowercase);
}
nsAttrSelector::nsAttrSelector(int32_t aNameSpace, const nsString& aAttr, uint8_t aFunction,
const nsString& aValue,
ValueCaseSensitivity aValueCaseSensitivity)
: mValue(aValue),
mNext(nullptr),
mLowercaseAttr(nullptr),
mCasedAttr(nullptr),
mNameSpace(aNameSpace),
mFunction(aFunction),
mValueCaseSensitivity(aValueCaseSensitivity)
{
MOZ_COUNT_CTOR(nsAttrSelector);
nsAutoString lowercase;
nsContentUtils::ASCIIToLower(aAttr, lowercase);
mCasedAttr = NS_Atomize(aAttr);
mLowercaseAttr = NS_Atomize(lowercase);
}
nsAttrSelector::nsAttrSelector(int32_t aNameSpace, nsAtom* aLowercaseAttr,
nsAtom* aCasedAttr, uint8_t aFunction,
const nsString& aValue,
ValueCaseSensitivity aValueCaseSensitivity)
: mValue(aValue),
mNext(nullptr),
mLowercaseAttr(aLowercaseAttr),
mCasedAttr(aCasedAttr),
mNameSpace(aNameSpace),
mFunction(aFunction),
mValueCaseSensitivity(aValueCaseSensitivity)
{
MOZ_COUNT_CTOR(nsAttrSelector);
}
nsAttrSelector*
nsAttrSelector::Clone(bool aDeep) const
{
nsAttrSelector *result =
new nsAttrSelector(mNameSpace, mLowercaseAttr, mCasedAttr,
mFunction, mValue, mValueCaseSensitivity);
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);
}
size_t
nsAttrSelector::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
{
size_t n = 0;
const nsAttrSelector* p = this;
while (p) {
n += aMallocSizeOf(p);
n += p->mValue.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
p = p->mNext;
}
return n;
}
// -- 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(CSSPseudoElementType::NotPseudo)
{
MOZ_COUNT_CTOR(nsCSSSelector);
}
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 = char16_t(0);
}
void nsCSSSelector::SetNameSpace(int32_t aNameSpace)
{
mNameSpace = aNameSpace;
}
void nsCSSSelector::SetTag(const nsString& aTag)
{
if (aTag.IsEmpty()) {
mLowercaseTag = mCasedTag = nullptr;
return;
}
mCasedTag = NS_Atomize(aTag);
nsAutoString lowercase;
nsContentUtils::ASCIIToLower(aTag, lowercase);
mLowercaseTag = NS_Atomize(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(CSSPseudoClassType aType)
{
AddPseudoClassInternal(new nsPseudoClassList(aType));
}
void nsCSSSelector::AddPseudoClass(CSSPseudoClassType aType,
const char16_t* aString)
{
AddPseudoClassInternal(new nsPseudoClassList(aType, aString));
}
void nsCSSSelector::AddPseudoClass(CSSPseudoClassType aType,
const int32_t* aIntPair)
{
AddPseudoClassInternal(new nsPseudoClassList(aType, aIntPair));
}
void nsCSSSelector::AddPseudoClass(CSSPseudoClassType 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,
nsAttrSelector::ValueCaseSensitivity aCaseSensitivity)
{
if (!aAttr.IsEmpty()) {
nsAttrSelector** list = &mAttrList;
while (nullptr != *list) {
list = &((*list)->mNext);
}
*list = new nsAttrSelector(aNameSpace, aAttr, aFunc, aValue, aCaseSensitivity);
}
}
void nsCSSSelector::SetOperator(char16_t aOperator)
{
mOperator = aOperator;
}
int32_t nsCSSSelector::CalcWeightWithoutNegations() const
{
int32_t weight = 0;
#ifdef MOZ_XUL
MOZ_ASSERT(!(IsPseudoElement() &&
PseudoType() != CSSPseudoElementType::XULTree &&
mClassList),
"If non-XUL-tree pseudo-elements can have class selectors "
"after them, specificity calculation must be updated");
#else
MOZ_ASSERT(!(IsPseudoElement() && mClassList),
"If pseudo-elements can have class selectors "
"after them, specificity calculation must be updated");
#endif
MOZ_ASSERT(!(IsPseudoElement() && (mIDList || mAttrList)),
"If pseudo-elements can have id or attribute selectors "
"after them, specificity calculation must be updated");
if (IsPseudoElement()) {
weight += 1;
}
if (nullptr != mCasedTag) {
weight += 1;
}
nsAtomList* list = mIDList;
while (nullptr != list) {
weight += 1 << 20;
list = list->mNext;
}
list = mClassList;
#ifdef MOZ_XUL
// XUL tree pseudo-elements abuse mClassList to store some private
// data; ignore that.
if (PseudoType() == CSSPseudoElementType::XULTree) {
list = nullptr;
}
#endif
while (nullptr != list) {
weight += 1 << 10;
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 += 1 << 10;
plist = plist->mNext;
}
nsAttrSelector* attr = mAttrList;
while (nullptr != attr) {
weight += 1 << 10;
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, CSSStyleSheet* 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
AutoTArray<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, false);
// Append the combinator, if needed.
if (!stack.IsEmpty()) {
const nsCSSSelector *next = stack.ElementAt(index - 1);
char16_t oper = s->mOperator;
if (next->IsPseudoElement()) {
NS_ASSERTION(oper == char16_t(':'),
"improperly chained pseudo element");
} else {
NS_ASSERTION(oper != char16_t(0),
"compound selector without combinator");
aString.Append(char16_t(' '));
if (oper != char16_t(' ')) {
aString.Append(oper);
aString.Append(char16_t(' '));
}
}
}
}
}
void
nsCSSSelector::AppendToStringWithoutCombinators(
nsAString& aString,
CSSStyleSheet* aSheet,
bool aUseStandardNamespacePrefixes) const
{
AppendToStringWithoutCombinatorsOrNegations(aString, aSheet, false,
aUseStandardNamespacePrefixes);
for (const nsCSSSelector* negation = mNegations; negation;
negation = negation->mNegations) {
aString.AppendLiteral(":not(");
negation->AppendToStringWithoutCombinatorsOrNegations(
aString, aSheet, true, aUseStandardNamespacePrefixes);
aString.Append(char16_t(')'));
}
}
#ifdef DEBUG
nsCString
nsCSSSelector::RestrictedSelectorToString() const
{
MOZ_ASSERT(IsRestrictedSelector());
nsString result;
AppendToStringWithoutCombinators(result, nullptr, true);
return NS_ConvertUTF16toUTF8(result);
}
static bool
AppendStandardNamespacePrefixToString(nsAString& aString, int32_t aNameSpace)
{
if (aNameSpace == kNameSpaceID_Unknown) {
// Wildcard namespace; no prefix to write.
return false;
}
switch (aNameSpace) {
case kNameSpaceID_None:
break;
case kNameSpaceID_XML:
aString.AppendLiteral("xml");
break;
case kNameSpaceID_XHTML:
aString.AppendLiteral("html");
break;
case kNameSpaceID_XLink:
aString.AppendLiteral("xlink");
break;
case kNameSpaceID_XSLT:
aString.AppendLiteral("xsl");
break;
case kNameSpaceID_XBL:
aString.AppendLiteral("xbl");
break;
case kNameSpaceID_MathML:
aString.AppendLiteral("math");
break;
case kNameSpaceID_RDF:
aString.AppendLiteral("rdf");
break;
case kNameSpaceID_XUL:
aString.AppendLiteral("xul");
break;
case kNameSpaceID_SVG:
aString.AppendLiteral("svg");
break;
default:
aString.AppendLiteral("ns");
aString.AppendInt(aNameSpace);
break;
}
return true;
}
#endif
void
nsCSSSelector::AppendToStringWithoutCombinatorsOrNegations
(nsAString& aString, CSSStyleSheet* aSheet,
bool aIsNegated,
bool aUseStandardNamespacePrefixes) 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 (aUseStandardNamespacePrefixes) {
#ifdef DEBUG
// We have no sheet to look up prefix information from. This is
// only for debugging, so use some "standard" prefixes that
// are recognizable.
wroteNamespace =
AppendStandardNamespacePrefixToString(aString, mNameSpace);
if (wroteNamespace) {
aString.Append(char16_t('|'));
}
#endif
} else if (!sheetNS) {
NS_ASSERTION(mNameSpace == kNameSpaceID_Unknown ||
mNameSpace == kNameSpaceID_None,
"How did we get this namespace?");
if (mNameSpace == kNameSpaceID_None) {
aString.Append(char16_t('|'));
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(char16_t('|'));
wroteNamespace = true;
} else if (mNameSpace != kNameSpaceID_Unknown) {
NS_ASSERTION(CanBeNamespaced(aIsNegated),
"How did we end up with this namespace?");
nsAtom *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(char16_t('|'));
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(char16_t('*'));
}
} 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(char16_t('*'));
}
// While our atoms use one colon, most pseudo-elements require two
// colons (those not in CSS level 2) and all pseudo-elements allow
// two colons. So serialize to the non-deprecated two colon syntax.
aString.Append(char16_t(':'));
// 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(char16_t('#'));
nsStyleUtil::AppendEscapedCSSIdent(temp, aString);
list = list->mNext;
}
}
// Append each class in the linked list
if (mClassList) {
if (isPseudoElement) {
#ifdef MOZ_XUL
MOZ_ASSERT(nsCSSAnonBoxes::IsTreePseudoElement(mLowercaseTag),
"must be tree pseudo-element");
aString.Append(char16_t('('));
for (nsAtomList* list = mClassList; list; list = list->mNext) {
nsStyleUtil::AppendEscapedCSSIdent(nsDependentAtomString(list->mAtom), aString);
aString.Append(char16_t(','));
}
// replace the final comma with a close-paren
aString.Replace(aString.Length() - 1, 1, char16_t(')'));
#else
NS_ERROR("Can't happen");
#endif
} else {
nsAtomList* list = mClassList;
while (list != nullptr) {
list->mAtom->ToString(temp);
aString.Append(char16_t('.'));
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(char16_t('['));
// Append the namespace prefix
if (list->mNameSpace == kNameSpaceID_Unknown) {
aString.Append(char16_t('*'));
aString.Append(char16_t('|'));
} else if (list->mNameSpace != kNameSpaceID_None) {
if (aUseStandardNamespacePrefixes) {
#ifdef DEBUG
AppendStandardNamespacePrefixToString(aString, list->mNameSpace);
aString.Append(char16_t('|'));
#endif
} else if (aSheet) {
nsXMLNameSpaceMap *sheetNS = aSheet->GetNameSpaceMap();
nsAtom *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(char16_t('|'));
}
}
// 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(char16_t('~'));
else if (list->mFunction == NS_ATTR_FUNC_DASHMATCH)
aString.Append(char16_t('|'));
else if (list->mFunction == NS_ATTR_FUNC_BEGINSMATCH)
aString.Append(char16_t('^'));
else if (list->mFunction == NS_ATTR_FUNC_ENDSMATCH)
aString.Append(char16_t('$'));
else if (list->mFunction == NS_ATTR_FUNC_CONTAINSMATCH)
aString.Append(char16_t('*'));
aString.Append(char16_t('='));
// Append the value
nsStyleUtil::AppendEscapedCSSString(list->mValue, aString);
if (list->mValueCaseSensitivity ==
nsAttrSelector::ValueCaseSensitivity::CaseInsensitive) {
aString.AppendLiteral(u" i");
}
}
aString.Append(char16_t(']'));
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(char16_t('('));
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(char16_t('-'));
} else if (a != 1) {
temp.AppendInt(a);
}
temp.Append(char16_t('n'));
}
if (b != 0 || a == 0) {
if (b >= 0 && a != 0) // check a != 0 for whether we printed above
temp.Append(char16_t('+'));
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(char16_t(')'));
}
}
}
bool
nsCSSSelector::CanBeNamespaced(bool aIsNegated) const
{
return !aIsNegated ||
(!mIDList && !mClassList && !mPseudoClassList && !mAttrList);
}
size_t
nsCSSSelector::SizeOfIncludingThis(mozilla::MallocSizeOf 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);
MEASURE(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(char16_t aOperator)
{
nsCSSSelector* newSel = new nsCSSSelector();
if (mSelectors) {
NS_ASSERTION(aOperator != char16_t(0), "chaining without combinator");
mSelectors->SetOperator(aOperator);
} else {
NS_ASSERTION(aOperator == char16_t(0), "combinator without chaining");
}
newSel->mNext = mSelectors;
mSelectors = newSel;
return newSel;
}
void
nsCSSSelectorList::RemoveRightmostSelector()
{
nsCSSSelector* current = mSelectors;
mSelectors = mSelectors->mNext;
MOZ_ASSERT(mSelectors,
"Rightmost selector has been removed, but now "
"mSelectors is null");
mSelectors->SetOperator(char16_t(0));
// Make sure that deleting current won't delete the whole list.
current->mNext = nullptr;
delete current;
}
void
nsCSSSelectorList::ToString(nsAString& aResult, CSSStyleSheet* 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(mozilla::MallocSizeOf 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;
}
// --------------------------------------------------------
class DOMCSSDeclarationImpl : public nsDOMCSSDeclaration
{
protected:
// Needs to be protected so we can use NS_IMPL_ADDREF_USING_AGGREGATOR.
virtual ~DOMCSSDeclarationImpl(void);
// But we need to allow UniquePtr to delete us.
friend class mozilla::DefaultDelete<DOMCSSDeclarationImpl>;
public:
explicit DOMCSSDeclarationImpl(css::StyleRule *aRule);
NS_IMETHOD GetParentRule(nsIDOMCSSRule **aParent) override;
virtual DeclarationBlock* GetCSSDeclaration(Operation aOperation) override;
virtual nsresult SetCSSDeclaration(DeclarationBlock* aDecl) override;
virtual void GetCSSParsingEnvironment(CSSParsingEnvironment& aCSSParseEnv,
nsIPrincipal* aSubjectPrincipal) override;
nsDOMCSSDeclaration::ServoCSSParsingEnvironment
GetServoCSSParsingEnvironment(nsIPrincipal* aSubjectPrincipal) const final;
virtual nsIDocument* DocToUpdate() override;
// Override |AddRef| and |Release| for being owned by StyleRule. Also, we
// need to forward QI for cycle collection things to StyleRule.
NS_DECL_ISUPPORTS_INHERITED
virtual nsINode *GetParentObject() override
{
return mRule ? mRule->GetDocument() : nullptr;
}
virtual DocGroup* GetDocGroup() const override
{
if (!mRule) {
return nullptr;
}
nsIDocument* document = mRule->GetDocument();
return document ? document->GetDocGroup() : nullptr;
}
protected:
// This reference is not reference-counted. The rule object owns us and we go
// away when it does.
css::StyleRule *mRule;
};
DOMCSSDeclarationImpl::DOMCSSDeclarationImpl(css::StyleRule *aRule)
: mRule(aRule)
{
}
DOMCSSDeclarationImpl::~DOMCSSDeclarationImpl(void)
{
}
NS_IMPL_ADDREF_USING_AGGREGATOR(DOMCSSDeclarationImpl, mRule)
NS_IMPL_RELEASE_USING_AGGREGATOR(DOMCSSDeclarationImpl, mRule)
NS_INTERFACE_MAP_BEGIN(DOMCSSDeclarationImpl)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
// We forward the cycle collection interfaces to mRule, which is
// never null.
if (aIID.Equals(NS_GET_IID(nsCycleCollectionISupports)) ||
aIID.Equals(NS_GET_IID(nsXPCOMCycleCollectionParticipant))) {
return mRule->QueryInterface(aIID, aInstancePtr);
}
else
NS_IMPL_QUERY_TAIL_INHERITING(nsDOMCSSDeclaration)
DeclarationBlock*
DOMCSSDeclarationImpl::GetCSSDeclaration(Operation aOperation)
{
if (aOperation != eOperation_Read) {
RefPtr<CSSStyleSheet> sheet = mRule->GetStyleSheet();
if (sheet) {
sheet->WillDirty();
}
}
return mRule->GetDeclaration();
}
void
DOMCSSDeclarationImpl::GetCSSParsingEnvironment(CSSParsingEnvironment& aCSSParseEnv,
nsIPrincipal* aSubjectPrincipal)
{
GetCSSParsingEnvironmentForRule(mRule, aCSSParseEnv);
}
nsDOMCSSDeclaration::ServoCSSParsingEnvironment
DOMCSSDeclarationImpl::GetServoCSSParsingEnvironment(
nsIPrincipal* aSubjectPrincipal) const
{
MOZ_CRASH("GetURLData shouldn't be calling on a Gecko rule");
}
NS_IMETHODIMP
DOMCSSDeclarationImpl::GetParentRule(nsIDOMCSSRule **aParent)
{
NS_ENSURE_ARG_POINTER(aParent);
NS_IF_ADDREF(*aParent = mRule);
return NS_OK;
}
nsresult
DOMCSSDeclarationImpl::SetCSSDeclaration(DeclarationBlock* aDecl)
{
NS_PRECONDITION(mRule,
"can only be called when |GetCSSDeclaration| returned a declaration");
nsCOMPtr<nsIDocument> doc;
RefPtr<CSSStyleSheet> sheet = mRule->GetStyleSheet();
if (sheet) {
doc = sheet->GetAssociatedDocument();
}
mozAutoDocUpdate updateBatch(doc, UPDATE_STYLE, true);
mRule->SetDeclaration(aDecl->AsGecko());
if (sheet) {
sheet->RuleChanged(mRule);
}
return NS_OK;
}
nsIDocument*
DOMCSSDeclarationImpl::DocToUpdate()
{
return nullptr;
}
// -- StyleRule ------------------------------------
namespace mozilla {
namespace css {
uint16_t
StyleRule::Type() const
{
return nsIDOMCSSRule::STYLE_RULE;
}
NS_IMETHODIMP
StyleRule::GetStyle(nsIDOMCSSStyleDeclaration** aStyle)
{
NS_ADDREF(*aStyle = Style());
return NS_OK;
}
nsICSSDeclaration*
StyleRule::Style()
{
if (!mDOMDeclaration) {
mDOMDeclaration.reset(new DOMCSSDeclarationImpl(this));
}
return mDOMDeclaration.get();
}
NS_IMETHODIMP
StyleRule::GetCSSStyleRule(BindingStyleRule **aResult)
{
*aResult = this;
NS_ADDREF(*aResult);
return NS_OK;
}
StyleRule::StyleRule(nsCSSSelectorList* aSelector,
Declaration* aDeclaration,
uint32_t aLineNumber,
uint32_t aColumnNumber)
: BindingStyleRule(aLineNumber, aColumnNumber),
mSelector(aSelector),
mDeclaration(aDeclaration)
{
NS_PRECONDITION(aDeclaration, "must have a declaration");
mDeclaration->SetOwningRule(this);
}
// for |Clone|
StyleRule::StyleRule(const StyleRule& aCopy)
: BindingStyleRule(aCopy),
mSelector(aCopy.mSelector ? aCopy.mSelector->Clone() : nullptr),
mDeclaration(new Declaration(*aCopy.mDeclaration))
{
mDeclaration->SetOwningRule(this);
// rest is constructed lazily on existing data
}
StyleRule::~StyleRule()
{
delete mSelector;
DropReferences();
}
void
StyleRule::DropReferences()
{
if (mDeclaration) {
mDeclaration->SetOwningRule(nullptr);
}
}
// QueryInterface implementation for StyleRule
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(StyleRule)
if (aIID.Equals(NS_GET_IID(mozilla::css::StyleRule))) {
*aInstancePtr = this;
NS_ADDREF_THIS();
return NS_OK;
}
else
NS_INTERFACE_MAP_ENTRY(nsICSSStyleRuleDOMWrapper)
NS_INTERFACE_MAP_ENTRY(nsIDOMCSSStyleRule)
NS_INTERFACE_MAP_END_INHERITING(Rule)
NS_IMPL_ADDREF_INHERITED(StyleRule, Rule)
NS_IMPL_RELEASE_INHERITED(StyleRule, Rule)
NS_IMPL_CYCLE_COLLECTION_CLASS(StyleRule)
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(StyleRule, Rule)
// Keep this in sync with IsCCLeaf.
// 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.
if (tmp->mDOMDeclaration) {
tmp->mDOMDeclaration->TraceWrapper(aCallbacks, aClosure);
}
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(StyleRule, Rule)
// 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.
if (tmp->mDOMDeclaration) {
tmp->mDOMDeclaration->ReleaseWrapper(static_cast<nsISupports*>(p));
}
tmp->DropReferences();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(StyleRule, Rule)
// Keep this in sync with IsCCLeaf.
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
bool
StyleRule::IsCCLeaf() const
{
if (!Rule::IsCCLeaf()) {
return false;
}
return !mDOMDeclaration || !mDOMDeclaration->PreservingWrapper();
}
/* virtual */ int32_t
StyleRule::GetType() const
{
return Rule::STYLE_RULE;
}
/* virtual */ already_AddRefed<Rule>
StyleRule::Clone() const
{
RefPtr<Rule> clone = new StyleRule(*this);
return clone.forget();
}
void
StyleRule::SetDeclaration(Declaration* aDecl)
{
if (aDecl == mDeclaration) {
return;
}
mDeclaration->SetOwningRule(nullptr);
mDeclaration = aDecl;
mDeclaration->SetOwningRule(this);
}
#ifdef DEBUG
/* virtual */ void
StyleRule::List(FILE* out, int32_t aIndent) const
{
nsAutoCString str;
// Indent
for (int32_t index = aIndent; --index >= 0; ) {
str.AppendLiteral(" ");
}
if (mSelector) {
nsAutoString buffer;
mSelector->ToString(buffer, GetStyleSheet());
AppendUTF16toUTF8(buffer, str);
str.Append(' ');
}
if (nullptr != mDeclaration) {
nsAutoString buffer;
str.AppendLiteral("{ ");
mDeclaration->ToString(buffer);
AppendUTF16toUTF8(buffer, str);
str.Append('}');
CSSStyleSheet* sheet = GetStyleSheet();
if (sheet) {
nsIURI* uri = sheet->GetSheetURI();
if (uri) {
str.AppendLiteral(" /* ");
str.Append(uri->GetSpecOrDefault());
str.Append(':');
str.AppendInt(mLineNumber);
str.AppendLiteral(" */");
}
}
}
else {
str.AppendLiteral("{ null declaration }");
}
str.Append('\n');
fprintf_stderr(out, "%s", str.get());
}
#endif
void
StyleRule::GetCssTextImpl(nsAString& aCssText) const
{
if (mSelector) {
mSelector->ToString(aCssText, GetStyleSheet());
aCssText.Append(char16_t(' '));
}
aCssText.Append(char16_t('{'));
aCssText.Append(char16_t(' '));
if (mDeclaration)
{
nsAutoString tempString;
mDeclaration->ToString( tempString );
aCssText.Append( tempString );
}
aCssText.Append(char16_t(' '));
aCssText.Append(char16_t('}'));
}
NS_IMETHODIMP
StyleRule::GetSelectorText(nsAString& aSelectorText)
{
if (mSelector)
mSelector->ToString(aSelectorText, GetStyleSheet());
else
aSelectorText.Truncate();
return NS_OK;
}
NS_IMETHODIMP
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
return NS_OK;
}
/* virtual */ size_t
StyleRule::SizeOfIncludingThis(mozilla::MallocSizeOf 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:
// - mDOMRule;
return n;
}
nsCSSSelectorList*
StyleRule::GetSelectorAtIndex(uint32_t aIndex, ErrorResult& rv)
{
for (nsCSSSelectorList* sel = mSelector; sel;
sel = sel->mNext, --aIndex) {
if (aIndex == 0) {
return sel;
}
}
// Ran out of selectors
rv.Throw(NS_ERROR_INVALID_ARG);
return nullptr;
}
uint32_t
StyleRule::GetSelectorCount()
{
uint32_t count = 0;
for (nsCSSSelectorList* sel = mSelector; sel; sel = sel->mNext) {
++count;
}
return count;
}
nsresult
StyleRule::GetSelectorText(uint32_t aSelectorIndex, nsAString& aText)
{
ErrorResult rv;
nsCSSSelectorList* sel = GetSelectorAtIndex(aSelectorIndex, rv);
if (rv.Failed()) {
return rv.StealNSResult();
}
sel->mSelectors->ToString(aText, GetStyleSheet(), false);
return NS_OK;
}
nsresult
StyleRule::GetSpecificity(uint32_t aSelectorIndex, uint64_t* aSpecificity)
{
ErrorResult rv;
nsCSSSelectorList* sel = GetSelectorAtIndex(aSelectorIndex, rv);
if (rv.Failed()) {
return rv.StealNSResult();
}
*aSpecificity = sel->mWeight;
return NS_OK;
}
nsresult
StyleRule::SelectorMatchesElement(Element* aElement,
uint32_t aSelectorIndex,
const nsAString& aPseudo,
bool* aMatches)
{
ErrorResult rv;
nsCSSSelectorList* tail = GetSelectorAtIndex(aSelectorIndex, rv);
if (rv.Failed()) {
return rv.StealNSResult();
}
// We want just the one list item, not the whole list tail
nsAutoPtr<nsCSSSelectorList> sel(tail->Clone(false));
// Do not attempt to match if a pseudo element is requested and this is not
// a pseudo element selector, or vice versa.
if (aPseudo.IsEmpty() == sel->mSelectors->IsPseudoElement()) {
*aMatches = false;
return NS_OK;
}
if (!aPseudo.IsEmpty()) {
// We need to make sure that the requested pseudo element type
// matches the selector pseudo element type before proceeding.
RefPtr<nsAtom> pseudoElt = NS_Atomize(aPseudo);
if (sel->mSelectors->PseudoType() != nsCSSPseudoElements::
GetPseudoType(pseudoElt, CSSEnabledState::eIgnoreEnabledState)) {
*aMatches = false;
return NS_OK;
}
// We have a matching pseudo element, now remove it so we can compare
// directly against |element| when proceeding into SelectorListMatches.
// It's OK to do this - we just cloned sel and nothing else is using it.
sel->RemoveRightmostSelector();
}
// XXXbz what exactly should we do with visited state here? If we ever start
// caring about it, remember to do FlushPendingLinkUpdates().
TreeMatchContext matchingContext(false,
nsRuleWalker::eRelevantLinkUnvisited,
aElement->OwnerDoc(),
TreeMatchContext::eNeverMatchVisited);
*aMatches = nsCSSRuleProcessor::SelectorListMatches(aElement, matchingContext,
sel);
return NS_OK;
}
NotNull<DeclarationBlock*>
StyleRule::GetDeclarationBlock() const
{
return WrapNotNull(mDeclaration);
}
} // namespace css
} // namespace mozilla
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