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CSSStyleSheet.cpp
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CSSStyleSheet.cpp
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:tabstop=2:expandtab:shiftwidth=2:
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* representation of a CSS style sheet */
#include "mozilla/CSSStyleSheet.h"
#include "nsIAtom.h"
#include "nsCSSRuleProcessor.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/MediaListBinding.h"
#include "mozilla/css/NameSpaceRule.h"
#include "mozilla/css/GroupRule.h"
#include "mozilla/css/ImportRule.h"
#include "nsCSSRules.h"
#include "nsIMediaList.h"
#include "nsIDocument.h"
#include "nsPresContext.h"
#include "nsGkAtoms.h"
#include "nsQueryObject.h"
#include "nsString.h"
#include "nsTArray.h"
#include "nsIDOMCSSStyleSheet.h"
#include "mozilla/dom/CSSRuleList.h"
#include "nsIDOMMediaList.h"
#include "nsIDOMNode.h"
#include "nsError.h"
#include "nsCSSParser.h"
#include "mozilla/css/Loader.h"
#include "nsICSSLoaderObserver.h"
#include "nsNameSpaceManager.h"
#include "nsXMLNameSpaceMap.h"
#include "nsCOMPtr.h"
#include "nsContentUtils.h"
#include "nsIScriptSecurityManager.h"
#include "mozAutoDocUpdate.h"
#include "nsRuleNode.h"
#include "nsMediaFeatures.h"
#include "nsDOMClassInfoID.h"
#include "mozilla/Likely.h"
#include "mozilla/dom/CSSStyleSheetBinding.h"
#include "nsComponentManagerUtils.h"
#include "nsNullPrincipal.h"
#include "mozilla/RuleProcessorCache.h"
#include "nsIStyleSheetLinkingElement.h"
using namespace mozilla;
using namespace mozilla::dom;
// -------------------------------
// Style Rule List for the DOM
//
class CSSRuleListImpl final : public CSSRuleList
{
public:
explicit CSSRuleListImpl(CSSStyleSheet *aStyleSheet);
virtual CSSStyleSheet* GetParentObject() override;
virtual nsIDOMCSSRule*
IndexedGetter(uint32_t aIndex, bool& aFound) override;
virtual uint32_t
Length() override;
void DropReference() { mStyleSheet = nullptr; }
protected:
virtual ~CSSRuleListImpl();
CSSStyleSheet* mStyleSheet;
};
CSSRuleListImpl::CSSRuleListImpl(CSSStyleSheet *aStyleSheet)
{
// Not reference counted to avoid circular references.
// The style sheet will tell us when its going away.
mStyleSheet = aStyleSheet;
}
CSSRuleListImpl::~CSSRuleListImpl()
{
}
CSSStyleSheet*
CSSRuleListImpl::GetParentObject()
{
return mStyleSheet;
}
uint32_t
CSSRuleListImpl::Length()
{
if (!mStyleSheet) {
return 0;
}
return AssertedCast<uint32_t>(mStyleSheet->StyleRuleCount());
}
nsIDOMCSSRule*
CSSRuleListImpl::IndexedGetter(uint32_t aIndex, bool& aFound)
{
aFound = false;
if (mStyleSheet) {
// ensure rules have correct parent
mStyleSheet->EnsureUniqueInner();
css::Rule* rule = mStyleSheet->GetStyleRuleAt(aIndex);
if (rule) {
aFound = true;
return rule->GetDOMRule();
}
}
// Per spec: "Return Value ... null if ... not a valid index."
return nullptr;
}
template <class Numeric>
int32_t DoCompare(Numeric a, Numeric b)
{
if (a == b)
return 0;
if (a < b)
return -1;
return 1;
}
bool
nsMediaExpression::Matches(nsPresContext *aPresContext,
const nsCSSValue& aActualValue) const
{
const nsCSSValue& actual = aActualValue;
const nsCSSValue& required = mValue;
// If we don't have the feature, the match fails.
if (actual.GetUnit() == eCSSUnit_Null) {
return false;
}
// If the expression had no value to match, the match succeeds,
// unless the value is an integer 0 or a zero length.
if (required.GetUnit() == eCSSUnit_Null) {
if (actual.GetUnit() == eCSSUnit_Integer)
return actual.GetIntValue() != 0;
if (actual.IsLengthUnit())
return actual.GetFloatValue() != 0;
return true;
}
NS_ASSERTION(mFeature->mRangeType == nsMediaFeature::eMinMaxAllowed ||
mRange == nsMediaExpression::eEqual, "yikes");
int32_t cmp; // -1 (actual < required)
// 0 (actual == required)
// 1 (actual > required)
switch (mFeature->mValueType) {
case nsMediaFeature::eLength:
{
NS_ASSERTION(actual.IsLengthUnit(), "bad actual value");
NS_ASSERTION(required.IsLengthUnit(), "bad required value");
nscoord actualCoord = nsRuleNode::CalcLengthWithInitialFont(
aPresContext, actual);
nscoord requiredCoord = nsRuleNode::CalcLengthWithInitialFont(
aPresContext, required);
cmp = DoCompare(actualCoord, requiredCoord);
}
break;
case nsMediaFeature::eInteger:
case nsMediaFeature::eBoolInteger:
{
NS_ASSERTION(actual.GetUnit() == eCSSUnit_Integer,
"bad actual value");
NS_ASSERTION(required.GetUnit() == eCSSUnit_Integer,
"bad required value");
NS_ASSERTION(mFeature->mValueType != nsMediaFeature::eBoolInteger ||
actual.GetIntValue() == 0 || actual.GetIntValue() == 1,
"bad actual bool integer value");
NS_ASSERTION(mFeature->mValueType != nsMediaFeature::eBoolInteger ||
required.GetIntValue() == 0 || required.GetIntValue() == 1,
"bad required bool integer value");
cmp = DoCompare(actual.GetIntValue(), required.GetIntValue());
}
break;
case nsMediaFeature::eFloat:
{
NS_ASSERTION(actual.GetUnit() == eCSSUnit_Number,
"bad actual value");
NS_ASSERTION(required.GetUnit() == eCSSUnit_Number,
"bad required value");
cmp = DoCompare(actual.GetFloatValue(), required.GetFloatValue());
}
break;
case nsMediaFeature::eIntRatio:
{
NS_ASSERTION(actual.GetUnit() == eCSSUnit_Array &&
actual.GetArrayValue()->Count() == 2 &&
actual.GetArrayValue()->Item(0).GetUnit() ==
eCSSUnit_Integer &&
actual.GetArrayValue()->Item(1).GetUnit() ==
eCSSUnit_Integer,
"bad actual value");
NS_ASSERTION(required.GetUnit() == eCSSUnit_Array &&
required.GetArrayValue()->Count() == 2 &&
required.GetArrayValue()->Item(0).GetUnit() ==
eCSSUnit_Integer &&
required.GetArrayValue()->Item(1).GetUnit() ==
eCSSUnit_Integer,
"bad required value");
// Convert to int64_t so we can multiply without worry. Note
// that while the spec requires that both halves of |required|
// be positive, the numerator or denominator of |actual| might
// be zero (e.g., when testing 'aspect-ratio' on a 0-width or
// 0-height iframe).
int64_t actualNum = actual.GetArrayValue()->Item(0).GetIntValue(),
actualDen = actual.GetArrayValue()->Item(1).GetIntValue(),
requiredNum = required.GetArrayValue()->Item(0).GetIntValue(),
requiredDen = required.GetArrayValue()->Item(1).GetIntValue();
cmp = DoCompare(actualNum * requiredDen, requiredNum * actualDen);
}
break;
case nsMediaFeature::eResolution:
{
NS_ASSERTION(actual.GetUnit() == eCSSUnit_Inch ||
actual.GetUnit() == eCSSUnit_Pixel ||
actual.GetUnit() == eCSSUnit_Centimeter,
"bad actual value");
NS_ASSERTION(required.GetUnit() == eCSSUnit_Inch ||
required.GetUnit() == eCSSUnit_Pixel ||
required.GetUnit() == eCSSUnit_Centimeter,
"bad required value");
float actualDPI = actual.GetFloatValue();
if (actual.GetUnit() == eCSSUnit_Centimeter) {
actualDPI = actualDPI * 2.54f;
} else if (actual.GetUnit() == eCSSUnit_Pixel) {
actualDPI = actualDPI * 96.0f;
}
float requiredDPI = required.GetFloatValue();
if (required.GetUnit() == eCSSUnit_Centimeter) {
requiredDPI = requiredDPI * 2.54f;
} else if (required.GetUnit() == eCSSUnit_Pixel) {
requiredDPI = requiredDPI * 96.0f;
}
cmp = DoCompare(actualDPI, requiredDPI);
}
break;
case nsMediaFeature::eEnumerated:
{
NS_ASSERTION(actual.GetUnit() == eCSSUnit_Enumerated,
"bad actual value");
NS_ASSERTION(required.GetUnit() == eCSSUnit_Enumerated,
"bad required value");
NS_ASSERTION(mFeature->mRangeType == nsMediaFeature::eMinMaxNotAllowed,
"bad range"); // we asserted above about mRange
// We don't really need DoCompare, but it doesn't hurt (and
// maybe the compiler will condense this case with eInteger).
cmp = DoCompare(actual.GetIntValue(), required.GetIntValue());
}
break;
case nsMediaFeature::eIdent:
{
NS_ASSERTION(actual.GetUnit() == eCSSUnit_Ident,
"bad actual value");
NS_ASSERTION(required.GetUnit() == eCSSUnit_Ident,
"bad required value");
NS_ASSERTION(mFeature->mRangeType == nsMediaFeature::eMinMaxNotAllowed,
"bad range");
cmp = !(actual == required); // string comparison
}
break;
}
switch (mRange) {
case nsMediaExpression::eMin:
return cmp != -1;
case nsMediaExpression::eMax:
return cmp != 1;
case nsMediaExpression::eEqual:
return cmp == 0;
}
NS_NOTREACHED("unexpected mRange");
return false;
}
void
nsMediaQueryResultCacheKey::AddExpression(const nsMediaExpression* aExpression,
bool aExpressionMatches)
{
const nsMediaFeature *feature = aExpression->mFeature;
FeatureEntry *entry = nullptr;
for (uint32_t i = 0; i < mFeatureCache.Length(); ++i) {
if (mFeatureCache[i].mFeature == feature) {
entry = &mFeatureCache[i];
break;
}
}
if (!entry) {
entry = mFeatureCache.AppendElement();
if (!entry) {
return; /* out of memory */
}
entry->mFeature = feature;
}
ExpressionEntry eentry = { *aExpression, aExpressionMatches };
entry->mExpressions.AppendElement(eentry);
}
bool
nsMediaQueryResultCacheKey::Matches(nsPresContext* aPresContext) const
{
if (aPresContext->Medium() != mMedium) {
return false;
}
for (uint32_t i = 0; i < mFeatureCache.Length(); ++i) {
const FeatureEntry *entry = &mFeatureCache[i];
nsCSSValue actual;
nsresult rv =
(entry->mFeature->mGetter)(aPresContext, entry->mFeature, actual);
NS_ENSURE_SUCCESS(rv, false); // any better ideas?
for (uint32_t j = 0; j < entry->mExpressions.Length(); ++j) {
const ExpressionEntry &eentry = entry->mExpressions[j];
if (eentry.mExpression.Matches(aPresContext, actual) !=
eentry.mExpressionMatches) {
return false;
}
}
}
return true;
}
bool
nsDocumentRuleResultCacheKey::AddMatchingRule(css::DocumentRule* aRule)
{
MOZ_ASSERT(!mFinalized);
return mMatchingRules.AppendElement(aRule);
}
void
nsDocumentRuleResultCacheKey::Finalize()
{
mMatchingRules.Sort();
#ifdef DEBUG
mFinalized = true;
#endif
}
#ifdef DEBUG
static bool
ArrayIsSorted(const nsTArray<css::DocumentRule*>& aRules)
{
for (size_t i = 1; i < aRules.Length(); i++) {
if (aRules[i - 1] > aRules[i]) {
return false;
}
}
return true;
}
#endif
bool
nsDocumentRuleResultCacheKey::Matches(
nsPresContext* aPresContext,
const nsTArray<css::DocumentRule*>& aRules) const
{
MOZ_ASSERT(mFinalized);
MOZ_ASSERT(ArrayIsSorted(mMatchingRules));
MOZ_ASSERT(ArrayIsSorted(aRules));
#ifdef DEBUG
for (css::DocumentRule* rule : mMatchingRules) {
MOZ_ASSERT(aRules.BinaryIndexOf(rule) != aRules.NoIndex,
"aRules must contain all rules in mMatchingRules");
}
#endif
// First check that aPresContext matches all the rules listed in
// mMatchingRules.
for (css::DocumentRule* rule : mMatchingRules) {
if (!rule->UseForPresentation(aPresContext)) {
return false;
}
}
// Then check that all the rules in aRules that aren't also in
// mMatchingRules do not match.
// pointer to matching rules
auto pm = mMatchingRules.begin();
auto pm_end = mMatchingRules.end();
// pointer to all rules
auto pr = aRules.begin();
auto pr_end = aRules.end();
// mMatchingRules and aRules are both sorted by their pointer values,
// so we can iterate over the two lists simultaneously.
while (pr < pr_end) {
while (pm < pm_end && *pm < *pr) {
++pm;
}
if (pm >= pm_end || *pm != *pr) {
if ((*pr)->UseForPresentation(aPresContext)) {
return false;
}
}
++pr;
}
return true;
}
#ifdef DEBUG
void
nsDocumentRuleResultCacheKey::List(FILE* aOut, int32_t aIndent) const
{
for (css::DocumentRule* rule : mMatchingRules) {
nsCString str;
for (int32_t i = 0; i < aIndent; i++) {
str.AppendLiteral(" ");
}
str.AppendLiteral("{ ");
nsString condition;
rule->GetConditionText(condition);
AppendUTF16toUTF8(condition, str);
str.AppendLiteral(" }\n");
fprintf_stderr(aOut, "%s", str.get());
}
}
#endif
size_t
nsDocumentRuleResultCacheKey::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
size_t n = 0;
n += mMatchingRules.ShallowSizeOfExcludingThis(aMallocSizeOf);
return n;
}
void
nsMediaQuery::AppendToString(nsAString& aString) const
{
if (mHadUnknownExpression) {
aString.AppendLiteral("not all");
return;
}
NS_ASSERTION(!mNegated || !mHasOnly, "can't have not and only");
NS_ASSERTION(!mTypeOmitted || (!mNegated && !mHasOnly),
"can't have not or only when type is omitted");
if (!mTypeOmitted) {
if (mNegated) {
aString.AppendLiteral("not ");
} else if (mHasOnly) {
aString.AppendLiteral("only ");
}
aString.Append(nsDependentAtomString(mMediaType));
}
for (uint32_t i = 0, i_end = mExpressions.Length(); i < i_end; ++i) {
if (i > 0 || !mTypeOmitted)
aString.AppendLiteral(" and ");
aString.Append('(');
const nsMediaExpression &expr = mExpressions[i];
if (expr.mRange == nsMediaExpression::eMin) {
aString.AppendLiteral("min-");
} else if (expr.mRange == nsMediaExpression::eMax) {
aString.AppendLiteral("max-");
}
const nsMediaFeature *feature = expr.mFeature;
aString.Append(nsDependentAtomString(*feature->mName));
if (expr.mValue.GetUnit() != eCSSUnit_Null) {
aString.AppendLiteral(": ");
switch (feature->mValueType) {
case nsMediaFeature::eLength:
NS_ASSERTION(expr.mValue.IsLengthUnit(), "bad unit");
// Use 'width' as a property that takes length values
// written in the normal way.
expr.mValue.AppendToString(eCSSProperty_width, aString,
nsCSSValue::eNormalized);
break;
case nsMediaFeature::eInteger:
case nsMediaFeature::eBoolInteger:
NS_ASSERTION(expr.mValue.GetUnit() == eCSSUnit_Integer,
"bad unit");
// Use 'z-index' as a property that takes integer values
// written without anything extra.
expr.mValue.AppendToString(eCSSProperty_z_index, aString,
nsCSSValue::eNormalized);
break;
case nsMediaFeature::eFloat:
{
NS_ASSERTION(expr.mValue.GetUnit() == eCSSUnit_Number,
"bad unit");
// Use 'line-height' as a property that takes float values
// written in the normal way.
expr.mValue.AppendToString(eCSSProperty_line_height, aString,
nsCSSValue::eNormalized);
}
break;
case nsMediaFeature::eIntRatio:
{
NS_ASSERTION(expr.mValue.GetUnit() == eCSSUnit_Array,
"bad unit");
nsCSSValue::Array *array = expr.mValue.GetArrayValue();
NS_ASSERTION(array->Count() == 2, "unexpected length");
NS_ASSERTION(array->Item(0).GetUnit() == eCSSUnit_Integer,
"bad unit");
NS_ASSERTION(array->Item(1).GetUnit() == eCSSUnit_Integer,
"bad unit");
array->Item(0).AppendToString(eCSSProperty_z_index, aString,
nsCSSValue::eNormalized);
aString.Append('/');
array->Item(1).AppendToString(eCSSProperty_z_index, aString,
nsCSSValue::eNormalized);
}
break;
case nsMediaFeature::eResolution:
{
aString.AppendFloat(expr.mValue.GetFloatValue());
if (expr.mValue.GetUnit() == eCSSUnit_Inch) {
aString.AppendLiteral("dpi");
} else if (expr.mValue.GetUnit() == eCSSUnit_Pixel) {
aString.AppendLiteral("dppx");
} else {
NS_ASSERTION(expr.mValue.GetUnit() == eCSSUnit_Centimeter,
"bad unit");
aString.AppendLiteral("dpcm");
}
}
break;
case nsMediaFeature::eEnumerated:
NS_ASSERTION(expr.mValue.GetUnit() == eCSSUnit_Enumerated,
"bad unit");
AppendASCIItoUTF16(
nsCSSProps::ValueToKeyword(expr.mValue.GetIntValue(),
feature->mData.mKeywordTable),
aString);
break;
case nsMediaFeature::eIdent:
NS_ASSERTION(expr.mValue.GetUnit() == eCSSUnit_Ident,
"bad unit");
aString.Append(expr.mValue.GetStringBufferValue());
break;
}
}
aString.Append(')');
}
}
nsMediaQuery*
nsMediaQuery::Clone() const
{
return new nsMediaQuery(*this);
}
bool
nsMediaQuery::Matches(nsPresContext* aPresContext,
nsMediaQueryResultCacheKey* aKey) const
{
if (mHadUnknownExpression)
return false;
bool match =
mMediaType == aPresContext->Medium() || mMediaType == nsGkAtoms::all;
for (uint32_t i = 0, i_end = mExpressions.Length(); match && i < i_end; ++i) {
const nsMediaExpression &expr = mExpressions[i];
nsCSSValue actual;
nsresult rv =
(expr.mFeature->mGetter)(aPresContext, expr.mFeature, actual);
NS_ENSURE_SUCCESS(rv, false); // any better ideas?
match = expr.Matches(aPresContext, actual);
if (aKey) {
aKey->AddExpression(&expr, match);
}
}
return match == !mNegated;
}
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsMediaList)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsIDOMMediaList)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsMediaList)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsMediaList)
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(nsMediaList)
nsMediaList::nsMediaList()
: mStyleSheet(nullptr)
{
}
nsMediaList::~nsMediaList()
{
}
/* virtual */ JSObject*
nsMediaList::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return MediaListBinding::Wrap(aCx, this, aGivenProto);
}
void
nsMediaList::GetText(nsAString& aMediaText)
{
aMediaText.Truncate();
for (int32_t i = 0, i_end = mArray.Length(); i < i_end; ++i) {
nsMediaQuery* query = mArray[i];
query->AppendToString(aMediaText);
if (i + 1 < i_end) {
aMediaText.AppendLiteral(", ");
}
}
}
// XXXbz this is so ill-defined in the spec, it's not clear quite what
// it should be doing....
void
nsMediaList::SetText(const nsAString& aMediaText)
{
nsCSSParser parser;
bool htmlMode = mStyleSheet && mStyleSheet->GetOwnerNode();
parser.ParseMediaList(aMediaText, nullptr, 0, this, htmlMode);
}
bool
nsMediaList::Matches(nsPresContext* aPresContext,
nsMediaQueryResultCacheKey* aKey)
{
for (int32_t i = 0, i_end = mArray.Length(); i < i_end; ++i) {
if (mArray[i]->Matches(aPresContext, aKey)) {
return true;
}
}
return mArray.IsEmpty();
}
void
nsMediaList::SetStyleSheet(CSSStyleSheet* aSheet)
{
NS_ASSERTION(aSheet == mStyleSheet || !aSheet || !mStyleSheet,
"multiple style sheets competing for one media list");
mStyleSheet = aSheet;
}
already_AddRefed<nsMediaList>
nsMediaList::Clone()
{
RefPtr<nsMediaList> result = new nsMediaList();
result->mArray.AppendElements(mArray.Length());
for (uint32_t i = 0, i_end = mArray.Length(); i < i_end; ++i) {
result->mArray[i] = mArray[i]->Clone();
MOZ_ASSERT(result->mArray[i]);
}
return result.forget();
}
NS_IMETHODIMP
nsMediaList::GetMediaText(nsAString& aMediaText)
{
GetText(aMediaText);
return NS_OK;
}
// "sheet" should be a CSSStyleSheet and "doc" should be an
// nsCOMPtr<nsIDocument>
#define BEGIN_MEDIA_CHANGE(sheet, doc) \
if (sheet) { \
doc = sheet->GetOwningDocument(); \
} \
mozAutoDocUpdate updateBatch(doc, UPDATE_STYLE, true); \
if (sheet) { \
sheet->WillDirty(); \
}
#define END_MEDIA_CHANGE(sheet, doc) \
if (sheet) { \
sheet->DidDirty(); \
} \
/* XXXldb Pass something meaningful? */ \
if (doc) { \
doc->StyleRuleChanged(sheet, nullptr, nullptr); \
}
NS_IMETHODIMP
nsMediaList::SetMediaText(const nsAString& aMediaText)
{
nsCOMPtr<nsIDocument> doc;
BEGIN_MEDIA_CHANGE(mStyleSheet, doc)
SetText(aMediaText);
END_MEDIA_CHANGE(mStyleSheet, doc)
return NS_OK;
}
NS_IMETHODIMP
nsMediaList::GetLength(uint32_t* aLength)
{
NS_ENSURE_ARG_POINTER(aLength);
*aLength = Length();
return NS_OK;
}
NS_IMETHODIMP
nsMediaList::Item(uint32_t aIndex, nsAString& aReturn)
{
bool dummy;
IndexedGetter(aIndex, dummy, aReturn);
return NS_OK;
}
void
nsMediaList::IndexedGetter(uint32_t aIndex, bool& aFound, nsAString& aReturn)
{
if (aIndex < Length()) {
aFound = true;
aReturn.Truncate();
mArray[aIndex]->AppendToString(aReturn);
} else {
aFound = false;
SetDOMStringToNull(aReturn);
}
}
NS_IMETHODIMP
nsMediaList::DeleteMedium(const nsAString& aOldMedium)
{
nsresult rv = NS_OK;
nsCOMPtr<nsIDocument> doc;
BEGIN_MEDIA_CHANGE(mStyleSheet, doc)
rv = Delete(aOldMedium);
if (NS_FAILED(rv))
return rv;
END_MEDIA_CHANGE(mStyleSheet, doc)
return rv;
}
NS_IMETHODIMP
nsMediaList::AppendMedium(const nsAString& aNewMedium)
{
nsresult rv = NS_OK;
nsCOMPtr<nsIDocument> doc;
BEGIN_MEDIA_CHANGE(mStyleSheet, doc)
rv = Append(aNewMedium);
if (NS_FAILED(rv))
return rv;
END_MEDIA_CHANGE(mStyleSheet, doc)
return rv;
}
nsresult
nsMediaList::Delete(const nsAString& aOldMedium)
{
if (aOldMedium.IsEmpty())
return NS_ERROR_DOM_NOT_FOUND_ERR;
for (int32_t i = 0, i_end = mArray.Length(); i < i_end; ++i) {
nsMediaQuery* query = mArray[i];
nsAutoString buf;
query->AppendToString(buf);
if (buf == aOldMedium) {
mArray.RemoveElementAt(i);
return NS_OK;
}
}
return NS_ERROR_DOM_NOT_FOUND_ERR;
}
nsresult
nsMediaList::Append(const nsAString& aNewMedium)
{
if (aNewMedium.IsEmpty())
return NS_ERROR_DOM_NOT_FOUND_ERR;
Delete(aNewMedium);
nsresult rv = NS_OK;
nsTArray<nsAutoPtr<nsMediaQuery> > buf;
mArray.SwapElements(buf);
SetText(aNewMedium);
if (mArray.Length() == 1) {
nsMediaQuery *query = mArray[0].forget();
if (!buf.AppendElement(query)) {
delete query;
rv = NS_ERROR_OUT_OF_MEMORY;
}
}
mArray.SwapElements(buf);
return rv;
}
namespace mozilla {
// -------------------------------
// CSS Style Sheet Inner Data Container
//
CSSStyleSheetInner::CSSStyleSheetInner(CSSStyleSheet* aPrimarySheet,
CORSMode aCORSMode,
ReferrerPolicy aReferrerPolicy,
const SRIMetadata& aIntegrity)
: mSheets()
, mCORSMode(aCORSMode)
, mReferrerPolicy (aReferrerPolicy)
, mIntegrity(aIntegrity)
, mComplete(false)
#ifdef DEBUG
, mPrincipalSet(false)
#endif
{
MOZ_COUNT_CTOR(CSSStyleSheetInner);
mSheets.AppendElement(aPrimarySheet);
mPrincipal = nsNullPrincipal::Create();
if (!mPrincipal) {
NS_RUNTIMEABORT("nsNullPrincipal::Init failed");
}
}
static bool SetStyleSheetReference(css::Rule* aRule, void* aSheet)
{
if (aRule) {
aRule->SetStyleSheet(static_cast<CSSStyleSheet*>(aSheet));
}
return true;
}
struct ChildSheetListBuilder {
RefPtr<CSSStyleSheet>* sheetSlot;
CSSStyleSheet* parent;
void SetParentLinks(CSSStyleSheet* aSheet) {
aSheet->mParent = parent;
aSheet->SetOwningDocument(parent->mDocument);
}
static void ReparentChildList(CSSStyleSheet* aPrimarySheet,
CSSStyleSheet* aFirstChild)
{
for (CSSStyleSheet *child = aFirstChild; child; child = child->mNext) {
child->mParent = aPrimarySheet;
child->SetOwningDocument(aPrimarySheet->mDocument);
}
}
};
bool
CSSStyleSheet::RebuildChildList(css::Rule* aRule, void* aBuilder)
{
int32_t type = aRule->GetType();
if (type < css::Rule::IMPORT_RULE) {
// Keep going till we get to the import rules.
return true;
}
if (type != css::Rule::IMPORT_RULE) {
// We're past all the import rules; stop the enumeration.
return false;
}
ChildSheetListBuilder* builder =
static_cast<ChildSheetListBuilder*>(aBuilder);
// XXXbz We really need to decomtaminate all this stuff. Is there a reason
// that I can't just QI to ImportRule and get a CSSStyleSheet
// directly from it?
nsCOMPtr<nsIDOMCSSImportRule> importRule(do_QueryInterface(aRule));
NS_ASSERTION(importRule, "GetType lied");
nsCOMPtr<nsIDOMCSSStyleSheet> childSheet;
importRule->GetStyleSheet(getter_AddRefs(childSheet));
// Have to do this QI to be safe, since XPConnect can fake
// nsIDOMCSSStyleSheets
RefPtr<CSSStyleSheet> cssSheet = do_QueryObject(childSheet);
if (!cssSheet) {
return true;
}
(*builder->sheetSlot) = cssSheet;
builder->SetParentLinks(*builder->sheetSlot);
builder->sheetSlot = &(*builder->sheetSlot)->mNext;
return true;
}
size_t
CSSStyleSheet::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
size_t n = 0;
const CSSStyleSheet* s = this;
while (s) {
n += aMallocSizeOf(s);
// Each inner can be shared by multiple sheets. So we only count the inner
// if this sheet is the first one in the list of those sharing it. As a
// result, the first such sheet takes all the blame for the memory
// consumption of the inner, which isn't ideal but it's better than
// double-counting the inner.
if (s->mInner->mSheets[0] == s) {
n += s->mInner->SizeOfIncludingThis(aMallocSizeOf);
}
// Measurement of the following members may be added later if DMD finds it
// is worthwhile:
// - s->mTitle
// - s->mMedia
// - s->mRuleCollection
// - s->mRuleProcessors
//
// The following members are not measured:
// - s->mOwnerRule, because it's non-owning
s = s->mNext;
}
return n;
}
CSSStyleSheetInner::CSSStyleSheetInner(CSSStyleSheetInner& aCopy,
CSSStyleSheet* aPrimarySheet)
: mSheets(),
mSheetURI(aCopy.mSheetURI),
mOriginalSheetURI(aCopy.mOriginalSheetURI),
mBaseURI(aCopy.mBaseURI),
mPrincipal(aCopy.mPrincipal),
mCORSMode(aCopy.mCORSMode),
mReferrerPolicy(aCopy.mReferrerPolicy),
mIntegrity(aCopy.mIntegrity),
mComplete(aCopy.mComplete)
#ifdef DEBUG
, mPrincipalSet(aCopy.mPrincipalSet)
#endif
{
MOZ_COUNT_CTOR(CSSStyleSheetInner);
AddSheet(aPrimarySheet);
aCopy.mOrderedRules.EnumerateForwards(css::GroupRule::CloneRuleInto, &mOrderedRules);
mOrderedRules.EnumerateForwards(SetStyleSheetReference, aPrimarySheet);
ChildSheetListBuilder builder = { &mFirstChild, aPrimarySheet };
mOrderedRules.EnumerateForwards(CSSStyleSheet::RebuildChildList, &builder);
RebuildNameSpaces();
}
CSSStyleSheetInner::~CSSStyleSheetInner()
{
MOZ_COUNT_DTOR(CSSStyleSheetInner);
mOrderedRules.EnumerateForwards(SetStyleSheetReference, nullptr);
}
CSSStyleSheetInner*
CSSStyleSheetInner::CloneFor(CSSStyleSheet* aPrimarySheet)
{
return new CSSStyleSheetInner(*this, aPrimarySheet);
}
void
CSSStyleSheetInner::AddSheet(CSSStyleSheet* aSheet)
{
mSheets.AppendElement(aSheet);
}