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gecko-dev/layout/style/nsCSSStyleSheet.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 "nsCSSStyleSheet.h"
#include "nsIAtom.h"
#include "nsCSSRuleProcessor.h"
#include "mozilla/dom/Element.h"
#include "mozilla/css/NameSpaceRule.h"
#include "mozilla/css/GroupRule.h"
#include "mozilla/css/ImportRule.h"
#include "nsIMediaList.h"
#include "nsIDocument.h"
#include "nsPresContext.h"
#include "nsGkAtoms.h"
#include "nsString.h"
#include "nsTArray.h"
#include "nsIDOMCSSStyleSheet.h"
#include "nsICSSRuleList.h"
#include "nsIDOMMediaList.h"
#include "nsIDOMNode.h"
#include "nsError.h"
#include "nsCSSParser.h"
#include "mozilla/css/Loader.h"
#include "nsICSSLoaderObserver.h"
#include "nsINameSpaceManager.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"
using namespace mozilla;
using namespace mozilla::dom;
// -------------------------------
// Style Rule List for the DOM
//
class CSSRuleListImpl : public nsICSSRuleList
{
public:
CSSRuleListImpl(nsCSSStyleSheet *aStyleSheet);
NS_DECL_ISUPPORTS
// nsIDOMCSSRuleList interface
NS_IMETHOD GetLength(uint32_t* aLength);
NS_IMETHOD Item(uint32_t aIndex, nsIDOMCSSRule** aReturn);
virtual nsIDOMCSSRule* GetItemAt(uint32_t aIndex, nsresult* aResult);
void DropReference() { mStyleSheet = nullptr; }
protected:
virtual ~CSSRuleListImpl();
nsCSSStyleSheet* mStyleSheet;
};
CSSRuleListImpl::CSSRuleListImpl(nsCSSStyleSheet *aStyleSheet)
{
// Not reference counted to avoid circular references.
// The style sheet will tell us when its going away.
mStyleSheet = aStyleSheet;
}
CSSRuleListImpl::~CSSRuleListImpl()
{
}
DOMCI_DATA(CSSRuleList, CSSRuleListImpl)
// QueryInterface implementation for CSSRuleList
NS_INTERFACE_MAP_BEGIN(CSSRuleListImpl)
NS_INTERFACE_MAP_ENTRY(nsICSSRuleList)
NS_INTERFACE_MAP_ENTRY(nsIDOMCSSRuleList)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(CSSRuleList)
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(CSSRuleListImpl)
NS_IMPL_RELEASE(CSSRuleListImpl)
NS_IMETHODIMP
CSSRuleListImpl::GetLength(uint32_t* aLength)
{
if (nullptr != mStyleSheet) {
int32_t count = mStyleSheet->StyleRuleCount();
*aLength = (uint32_t)count;
}
else {
*aLength = 0;
}
return NS_OK;
}
nsIDOMCSSRule*
CSSRuleListImpl::GetItemAt(uint32_t aIndex, nsresult* aResult)
{
nsresult result = NS_OK;
if (mStyleSheet) {
// ensure rules have correct parent
if (mStyleSheet->EnsureUniqueInner() !=
nsCSSStyleSheet::eUniqueInner_CloneFailed) {
nsRefPtr<css::Rule> rule;
result = mStyleSheet->GetStyleRuleAt(aIndex, *getter_AddRefs(rule));
if (rule) {
*aResult = NS_OK;
return rule->GetDOMRule();
}
if (result == NS_ERROR_ILLEGAL_VALUE) {
result = NS_OK; // per spec: "Return Value ... null if ... not a valid index."
}
}
}
*aResult = result;
return nullptr;
}
NS_IMETHODIMP
CSSRuleListImpl::Item(uint32_t aIndex, nsIDOMCSSRule** aReturn)
{
nsresult rv;
nsIDOMCSSRule* rule = GetItemAt(aIndex, &rv);
if (!rule) {
*aReturn = nullptr;
return rv;
}
NS_ADDREF(*aReturn = rule);
return NS_OK;
}
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;
}
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.AppendLiteral("(");
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);
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);
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);
}
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);
aString.AppendLiteral("/");
array->Item(1).AppendToString(eCSSProperty_z_index, aString);
}
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.AppendLiteral(")");
}
}
nsMediaQuery*
nsMediaQuery::Clone() const
{
nsAutoPtr<nsMediaQuery> result(new nsMediaQuery(*this));
NS_ENSURE_TRUE(result &&
result->mExpressions.Length() == mExpressions.Length(),
nullptr);
return result.forget();
}
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;
}
DOMCI_DATA(MediaList, nsMediaList)
NS_INTERFACE_MAP_BEGIN(nsMediaList)
NS_INTERFACE_MAP_ENTRY(nsIDOMMediaList)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(MediaList)
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(nsMediaList)
NS_IMPL_RELEASE(nsMediaList)
nsMediaList::nsMediaList()
: mStyleSheet(nullptr)
{
}
nsMediaList::~nsMediaList()
{
}
nsresult
nsMediaList::GetText(nsAString& aMediaText)
{
aMediaText.Truncate();
for (int32_t i = 0, i_end = mArray.Length(); i < i_end; ++i) {
nsMediaQuery* query = mArray[i];
NS_ENSURE_TRUE(query, NS_ERROR_FAILURE);
query->AppendToString(aMediaText);
if (i + 1 < i_end) {
aMediaText.AppendLiteral(", ");
}
}
return NS_OK;
}
// XXXbz this is so ill-defined in the spec, it's not clear quite what
// it should be doing....
nsresult
nsMediaList::SetText(const nsAString& aMediaText)
{
nsCSSParser parser;
bool htmlMode = mStyleSheet && mStyleSheet->GetOwnerNode();
return 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();
}
nsresult
nsMediaList::SetStyleSheet(nsCSSStyleSheet *aSheet)
{
NS_ASSERTION(aSheet == mStyleSheet || !aSheet || !mStyleSheet,
"multiple style sheets competing for one media list");
mStyleSheet = aSheet;
return NS_OK;
}
nsresult
nsMediaList::Clone(nsMediaList** aResult)
{
nsRefPtr<nsMediaList> result = new nsMediaList();
if (!result || !result->mArray.AppendElements(mArray.Length()))
return NS_ERROR_OUT_OF_MEMORY;
for (int32_t i = 0, i_end = mArray.Length(); i < i_end; ++i) {
if (!(result->mArray[i] = mArray[i]->Clone())) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
NS_ADDREF(*aResult = result);
return NS_OK;
}
NS_IMETHODIMP
nsMediaList::GetMediaText(nsAString& aMediaText)
{
return GetText(aMediaText);
}
// "sheet" should be an nsCSSStyleSheet 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) { \
rv = sheet->WillDirty(); \
NS_ENSURE_SUCCESS(rv, rv); \
}
#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)
{
nsresult rv = NS_OK;
nsCOMPtr<nsIDocument> doc;
BEGIN_MEDIA_CHANGE(mStyleSheet, doc)
rv = SetText(aMediaText);
if (NS_FAILED(rv))
return rv;
END_MEDIA_CHANGE(mStyleSheet, doc)
return rv;
}
NS_IMETHODIMP
nsMediaList::GetLength(uint32_t* aLength)
{
NS_ENSURE_ARG_POINTER(aLength);
*aLength = mArray.Length();
return NS_OK;
}
NS_IMETHODIMP
nsMediaList::Item(uint32_t aIndex, nsAString& aReturn)
{
int32_t index = aIndex;
if (0 <= index && index < Count()) {
nsMediaQuery* query = mArray[index];
NS_ENSURE_TRUE(query, NS_ERROR_FAILURE);
aReturn.Truncate();
query->AppendToString(aReturn);
} else {
SetDOMStringToNull(aReturn);
}
return NS_OK;
}
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];
NS_ENSURE_TRUE(query, NS_ERROR_FAILURE);
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;
}
// -------------------------------
// CSS Style Sheet Inner Data Container
//
nsCSSStyleSheetInner::nsCSSStyleSheetInner(nsCSSStyleSheet* aPrimarySheet,
CORSMode aCORSMode)
: mSheets(),
mCORSMode(aCORSMode),
mComplete(false)
#ifdef DEBUG
, mPrincipalSet(false)
#endif
{
MOZ_COUNT_CTOR(nsCSSStyleSheetInner);
mSheets.AppendElement(aPrimarySheet);
mPrincipal = do_CreateInstance("@mozilla.org/nullprincipal;1");
if (!mPrincipal) {
NS_RUNTIMEABORT("OOM");
}
}
static bool SetStyleSheetReference(css::Rule* aRule, void* aSheet)
{
if (aRule) {
aRule->SetStyleSheet(static_cast<nsCSSStyleSheet*>(aSheet));
}
return true;
}
static bool
CloneRuleInto(css::Rule* aRule, void* aArray)
{
nsRefPtr<css::Rule> clone = aRule->Clone();
static_cast<nsCOMArray<css::Rule>*>(aArray)->AppendObject(clone);
return true;
}
struct ChildSheetListBuilder {
nsRefPtr<nsCSSStyleSheet>* sheetSlot;
nsCSSStyleSheet* parent;
void SetParentLinks(nsCSSStyleSheet* aSheet) {
aSheet->mParent = parent;
aSheet->SetOwningDocument(parent->mDocument);
}
static void ReparentChildList(nsCSSStyleSheet* aPrimarySheet,
nsCSSStyleSheet* aFirstChild)
{
for (nsCSSStyleSheet *child = aFirstChild; child; child = child->mNext) {
child->mParent = aPrimarySheet;
child->SetOwningDocument(aPrimarySheet->mDocument);
}
}
};
bool
nsCSSStyleSheet::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 an nsCSSStyleSheet
// 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
nsRefPtr<nsCSSStyleSheet> cssSheet = do_QueryObject(childSheet);
if (!cssSheet) {
return true;
}
(*builder->sheetSlot) = cssSheet;
builder->SetParentLinks(*builder->sheetSlot);
builder->sheetSlot = &(*builder->sheetSlot)->mNext;
return true;
}
size_t
nsCSSStyleSheet::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
size_t n = 0;
const nsCSSStyleSheet* 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;
}
nsCSSStyleSheetInner::nsCSSStyleSheetInner(nsCSSStyleSheetInner& aCopy,
nsCSSStyleSheet* aPrimarySheet)
: mSheets(),
mSheetURI(aCopy.mSheetURI),
mOriginalSheetURI(aCopy.mOriginalSheetURI),
mBaseURI(aCopy.mBaseURI),
mPrincipal(aCopy.mPrincipal),
mCORSMode(aCopy.mCORSMode),
mComplete(aCopy.mComplete)
#ifdef DEBUG
, mPrincipalSet(aCopy.mPrincipalSet)
#endif
{
MOZ_COUNT_CTOR(nsCSSStyleSheetInner);
AddSheet(aPrimarySheet);
aCopy.mOrderedRules.EnumerateForwards(CloneRuleInto, &mOrderedRules);
mOrderedRules.EnumerateForwards(SetStyleSheetReference, aPrimarySheet);
ChildSheetListBuilder builder = { &mFirstChild, aPrimarySheet };
mOrderedRules.EnumerateForwards(nsCSSStyleSheet::RebuildChildList, &builder);
RebuildNameSpaces();
}
nsCSSStyleSheetInner::~nsCSSStyleSheetInner()
{
MOZ_COUNT_DTOR(nsCSSStyleSheetInner);
mOrderedRules.EnumerateForwards(SetStyleSheetReference, nullptr);
}
nsCSSStyleSheetInner*
nsCSSStyleSheetInner::CloneFor(nsCSSStyleSheet* aPrimarySheet)
{
return new nsCSSStyleSheetInner(*this, aPrimarySheet);
}
void
nsCSSStyleSheetInner::AddSheet(nsCSSStyleSheet* aSheet)
{
mSheets.AppendElement(aSheet);
}
void
nsCSSStyleSheetInner::RemoveSheet(nsCSSStyleSheet* aSheet)
{
if (1 == mSheets.Length()) {
NS_ASSERTION(aSheet == mSheets.ElementAt(0), "bad parent");
delete this;
return;
}
if (aSheet == mSheets.ElementAt(0)) {
mSheets.RemoveElementAt(0);
NS_ASSERTION(mSheets.Length(), "no parents");
mOrderedRules.EnumerateForwards(SetStyleSheetReference,
mSheets.ElementAt(0));
ChildSheetListBuilder::ReparentChildList(mSheets[0], mFirstChild);
}
else {
mSheets.RemoveElement(aSheet);
}
}
static void
AddNamespaceRuleToMap(css::Rule* aRule, nsXMLNameSpaceMap* aMap)
{
NS_ASSERTION(aRule->GetType() == css::Rule::NAMESPACE_RULE, "Bogus rule type");
nsRefPtr<css::NameSpaceRule> nameSpaceRule = do_QueryObject(aRule);
nsAutoString urlSpec;
nameSpaceRule->GetURLSpec(urlSpec);
aMap->AddPrefix(nameSpaceRule->GetPrefix(), urlSpec);
}
static bool
CreateNameSpace(css::Rule* aRule, void* aNameSpacePtr)
{
int32_t type = aRule->GetType();
if (css::Rule::NAMESPACE_RULE == type) {
AddNamespaceRuleToMap(aRule,
static_cast<nsXMLNameSpaceMap*>(aNameSpacePtr));
return true;
}
// stop if not namespace, import or charset because namespace can't follow
// anything else
return (css::Rule::CHARSET_RULE == type || css::Rule::IMPORT_RULE == type);
}
void
nsCSSStyleSheetInner::RebuildNameSpaces()
{
// Just nuke our existing namespace map, if any
if (NS_SUCCEEDED(CreateNamespaceMap())) {
mOrderedRules.EnumerateForwards(CreateNameSpace, mNameSpaceMap);
}
}
nsresult
nsCSSStyleSheetInner::CreateNamespaceMap()
{
mNameSpaceMap = nsXMLNameSpaceMap::Create(false);
NS_ENSURE_TRUE(mNameSpaceMap, NS_ERROR_OUT_OF_MEMORY);
// Override the default namespace map behavior for the null prefix to
// return the wildcard namespace instead of the null namespace.
mNameSpaceMap->AddPrefix(nullptr, kNameSpaceID_Unknown);
return NS_OK;
}
size_t
nsCSSStyleSheetInner::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
size_t n = aMallocSizeOf(this);
n += mOrderedRules.SizeOfExcludingThis(css::Rule::SizeOfCOMArrayElementIncludingThis,
aMallocSizeOf);
n += mFirstChild ? mFirstChild->SizeOfIncludingThis(aMallocSizeOf) : 0;
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - mSheetURI
// - mOriginalSheetURI
// - mBaseURI
// - mPrincipal
// - mNameSpaceMap
//
// The following members are not measured:
// - mSheets, because it's non-owning
return n;
}
// -------------------------------
// CSS Style Sheet
//
nsCSSStyleSheet::nsCSSStyleSheet(CORSMode aCORSMode)
: mTitle(),
mParent(nullptr),
mOwnerRule(nullptr),
mDocument(nullptr),
mOwningNode(nullptr),
mDisabled(false),
mDirty(false),
mScopeElement(nullptr),
mRuleProcessors(nullptr)
{
mInner = new nsCSSStyleSheetInner(this, aCORSMode);
SetIsDOMBinding();
}
nsCSSStyleSheet::nsCSSStyleSheet(const nsCSSStyleSheet& aCopy,
nsCSSStyleSheet* aParentToUse,
css::ImportRule* aOwnerRuleToUse,
nsIDocument* aDocumentToUse,
nsINode* aOwningNodeToUse)
: mTitle(aCopy.mTitle),
mParent(aParentToUse),
mOwnerRule(aOwnerRuleToUse),
mDocument(aDocumentToUse),
mOwningNode(aOwningNodeToUse),
mDisabled(aCopy.mDisabled),
mDirty(aCopy.mDirty),
mScopeElement(nullptr),
mInner(aCopy.mInner),
mRuleProcessors(nullptr)
{
mInner->AddSheet(this);
if (mDirty) { // CSSOM's been there, force full copy now
NS_ASSERTION(mInner->mComplete, "Why have rules been accessed on an incomplete sheet?");
// FIXME: handle failure?
EnsureUniqueInner();
}
if (aCopy.mMedia) {
// XXX This is wrong; we should be keeping @import rules and
// sheets in sync!
aCopy.mMedia->Clone(getter_AddRefs(mMedia));
}
SetIsDOMBinding();
}
nsCSSStyleSheet::~nsCSSStyleSheet()
{
for (nsCSSStyleSheet* child = mInner->mFirstChild;
child;
child = child->mNext) {
// XXXbz this is a little bogus; see the XXX comment where we
// declare mFirstChild.
if (child->mParent == this) {
child->mParent = nullptr;
child->mDocument = nullptr;
}
}
DropRuleCollection();
DropMedia();
mInner->RemoveSheet(this);
// XXX The document reference is not reference counted and should
// not be released. The document will let us know when it is going
// away.
if (mRuleProcessors) {
NS_ASSERTION(mRuleProcessors->Length() == 0, "destructing sheet with rule processor reference");
delete mRuleProcessors; // weak refs, should be empty here anyway
}
}
void
nsCSSStyleSheet::DropRuleCollection()
{
if (mRuleCollection) {
mRuleCollection->DropReference();
mRuleCollection = nullptr;
}
}
void
nsCSSStyleSheet::DropMedia()
{
if (mMedia) {
mMedia->SetStyleSheet(nullptr);
mMedia = nullptr;
}
}
void
nsCSSStyleSheet::UnlinkInner()
{
// We can only have a cycle through our inner if we have a unique inner,
// because otherwise there are no JS wrappers for anything in the inner.
if (mInner->mSheets.Length() != 1) {
return;
}
mInner->mOrderedRules.EnumerateForwards(SetStyleSheetReference, nullptr);
mInner->mOrderedRules.Clear();
// Have to be a bit careful with child sheets, because we want to
// drop their mNext pointers and null out their mParent and
// mDocument, but don't want to work with deleted objects. And we
// don't want to do any addrefing in the process, just to make sure
// we don't confuse the cycle collector (though on the face of it,
// addref/release pairs during unlink should probably be ok).
nsRefPtr<nsCSSStyleSheet> child;
child.swap(mInner->mFirstChild);
while (child) {
MOZ_ASSERT(child->mParent == this, "We have a unique inner!");
child->mParent = nullptr;
child->mDocument = nullptr;
nsRefPtr<nsCSSStyleSheet> next;
// Null out child->mNext, but don't let it die yet
next.swap(child->mNext);
// Switch to looking at the old value of child->mNext next iteration
child.swap(next);
// "next" is now our previous value of child; it'll get released
// as we loop around.
}
}
void
nsCSSStyleSheet::TraverseInner(nsCycleCollectionTraversalCallback &cb)
{
// We can only have a cycle through our inner if we have a unique inner,
// because otherwise there are no JS wrappers for anything in the inner.
if (mInner->mSheets.Length() != 1) {
return;
}
nsRefPtr<nsCSSStyleSheet>* childSheetSlot = &mInner->mFirstChild;
while (*childSheetSlot) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "child sheet");
cb.NoteXPCOMChild(NS_ISUPPORTS_CAST(nsIStyleSheet*, childSheetSlot->get()));
childSheetSlot = &(*childSheetSlot)->mNext;
}
const nsCOMArray<css::Rule>& rules = mInner->mOrderedRules;
for (int32_t i = 0, count = rules.Count(); i < count; ++i) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mOrderedRules[i]");
cb.NoteXPCOMChild(rules[i]->GetExistingDOMRule());
}
}
DOMCI_DATA(CSSStyleSheet, nsCSSStyleSheet)
// QueryInterface implementation for nsCSSStyleSheet
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsCSSStyleSheet)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsIStyleSheet)
NS_INTERFACE_MAP_ENTRY(nsIDOMStyleSheet)
NS_INTERFACE_MAP_ENTRY(nsIDOMCSSStyleSheet)
NS_INTERFACE_MAP_ENTRY(nsICSSLoaderObserver)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIStyleSheet)
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(CSSStyleSheet)
if (aIID.Equals(NS_GET_IID(nsCSSStyleSheet)))
foundInterface = reinterpret_cast<nsISupports*>(this);
else
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsCSSStyleSheet)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsCSSStyleSheet)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsCSSStyleSheet)
tmp->DropMedia();
// We do not unlink mNext; our parent will handle that. If we
// unlinked it here, our parent would not be able to walk its list
// of child sheets and null out the back-references to it, if we got
// unlinked before it does.
tmp->DropRuleCollection();
tmp->UnlinkInner();
tmp->mScopeElement = nullptr;
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsCSSStyleSheet)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mMedia)
// We do not traverse mNext; our parent will handle that. See
// comments in Unlink for why.
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRuleCollection)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mScopeElement)
tmp->TraverseInner(cb);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(nsCSSStyleSheet)
nsresult
nsCSSStyleSheet::AddRuleProcessor(nsCSSRuleProcessor* aProcessor)
{
if (! mRuleProcessors) {
mRuleProcessors = new nsAutoTArray<nsCSSRuleProcessor*, 8>();
if (!mRuleProcessors)
return NS_ERROR_OUT_OF_MEMORY;
}
NS_ASSERTION(mRuleProcessors->NoIndex == mRuleProcessors->IndexOf(aProcessor),
"processor already registered");
mRuleProcessors->AppendElement(aProcessor); // weak ref
return NS_OK;
}
nsresult
nsCSSStyleSheet::DropRuleProcessor(nsCSSRuleProcessor* aProcessor)
{
if (!mRuleProcessors)
return NS_ERROR_FAILURE;
return mRuleProcessors->RemoveElement(aProcessor)
? NS_OK
: NS_ERROR_FAILURE;
}
void
nsCSSStyleSheet::SetURIs(nsIURI* aSheetURI, nsIURI* aOriginalSheetURI,
nsIURI* aBaseURI)
{
NS_PRECONDITION(aSheetURI && aBaseURI, "null ptr");
NS_ASSERTION(mInner->mOrderedRules.Count() == 0 && !mInner->mComplete,
"Can't call SetURL on sheets that are complete or have rules");
mInner->mSheetURI = aSheetURI;
mInner->mOriginalSheetURI = aOriginalSheetURI;
mInner->mBaseURI = aBaseURI;
}
void
nsCSSStyleSheet::SetPrincipal(nsIPrincipal* aPrincipal)
{
NS_PRECONDITION(!mInner->mPrincipalSet,
"Should have an inner whose principal has not yet been set");
if (aPrincipal) {
mInner->mPrincipal = aPrincipal;
#ifdef DEBUG
mInner->mPrincipalSet = true;
#endif
}
}
/* virtual */ nsIURI*
nsCSSStyleSheet::GetSheetURI() const
{
return mInner->mSheetURI;
}
/* virtual */ nsIURI*
nsCSSStyleSheet::GetBaseURI() const
{
return mInner->mBaseURI;
}
/* virtual */ void
nsCSSStyleSheet::GetType(nsString& aType) const
{
aType.AssignLiteral("text/css");
}
bool
nsCSSStyleSheet::UseForPresentation(nsPresContext* aPresContext,
nsMediaQueryResultCacheKey& aKey) const
{
if (mMedia) {
return mMedia->Matches(aPresContext, &aKey);
}
return true;
}
void
nsCSSStyleSheet::SetMedia(nsMediaList* aMedia)
{
mMedia = aMedia;
}
/* virtual */ bool
nsCSSStyleSheet::HasRules() const
{
return StyleRuleCount() != 0;
}
/* virtual */ bool
nsCSSStyleSheet::IsApplicable() const
{
return !mDisabled && mInner->mComplete;
}
/* virtual */ void
nsCSSStyleSheet::SetEnabled(bool aEnabled)
{
// Internal method, so callers must handle BeginUpdate/EndUpdate
bool oldDisabled = mDisabled;
mDisabled = !aEnabled;
if (mInner->mComplete && oldDisabled != mDisabled) {
ClearRuleCascades();
if (mDocument) {
mDocument->SetStyleSheetApplicableState(this, !mDisabled);
}
}
}
/* virtual */ bool
nsCSSStyleSheet::IsComplete() const
{
return mInner->mComplete;
}
/* virtual */ void
nsCSSStyleSheet::SetComplete()
{
NS_ASSERTION(!mDirty, "Can't set a dirty sheet complete!");
mInner->mComplete = true;
if (mDocument && !mDisabled) {
// Let the document know
mDocument->BeginUpdate(UPDATE_STYLE);
mDocument->SetStyleSheetApplicableState(this, true);
mDocument->EndUpdate(UPDATE_STYLE);
}
}
/* virtual */ nsIStyleSheet*
nsCSSStyleSheet::GetParentSheet() const
{
return mParent;
}
/* virtual */ nsIDocument*
nsCSSStyleSheet::GetOwningDocument() const
{
return mDocument;
}
/* virtual */ void
nsCSSStyleSheet::SetOwningDocument(nsIDocument* aDocument)
{ // not ref counted
mDocument = aDocument;
// Now set the same document on all our child sheets....
// XXXbz this is a little bogus; see the XXX comment where we
// declare mFirstChild.
for (nsCSSStyleSheet* child = mInner->mFirstChild;
child; child = child->mNext) {
if (child->mParent == this) {
child->SetOwningDocument(aDocument);
}
}
}
uint64_t
nsCSSStyleSheet::FindOwningWindowInnerID() const
{
uint64_t windowID = 0;
if (mDocument) {
windowID = mDocument->InnerWindowID();
}
if (windowID == 0 && mOwningNode) {
windowID = mOwningNode->OwnerDoc()->InnerWindowID();
}
if (windowID == 0 && mOwnerRule) {
nsCOMPtr<nsIStyleSheet> sheet = static_cast<css::Rule*>(mOwnerRule)->GetStyleSheet();
if (sheet) {
nsRefPtr<nsCSSStyleSheet> cssSheet = do_QueryObject(sheet);
if (cssSheet) {
windowID = cssSheet->FindOwningWindowInnerID();
}
}
}
if (windowID == 0 && mParent) {
windowID = mParent->FindOwningWindowInnerID();
}
return windowID;
}
void
nsCSSStyleSheet::AppendStyleSheet(nsCSSStyleSheet* aSheet)
{
NS_PRECONDITION(nullptr != aSheet, "null arg");
if (NS_SUCCEEDED(WillDirty())) {
nsRefPtr<nsCSSStyleSheet>* tail = &mInner->mFirstChild;
while (*tail) {
tail = &(*tail)->mNext;
}
*tail = aSheet;
// This is not reference counted. Our parent tells us when
// it's going away.
aSheet->mParent = this;
aSheet->mDocument = mDocument;
DidDirty();
}
}
void
nsCSSStyleSheet::InsertStyleSheetAt(nsCSSStyleSheet* aSheet, int32_t aIndex)
{
NS_PRECONDITION(nullptr != aSheet, "null arg");
if (NS_SUCCEEDED(WillDirty())) {
nsRefPtr<nsCSSStyleSheet>* tail = &mInner->mFirstChild;
while (*tail && aIndex) {
--aIndex;
tail = &(*tail)->mNext;
}
aSheet->mNext = *tail;
*tail = aSheet;
// This is not reference counted. Our parent tells us when
// it's going away.
aSheet->mParent = this;
aSheet->mDocument = mDocument;
DidDirty();
}
}
void
nsCSSStyleSheet::PrependStyleRule(css::Rule* aRule)
{
NS_PRECONDITION(nullptr != aRule, "null arg");
if (NS_SUCCEEDED(WillDirty())) {
mInner->mOrderedRules.InsertObjectAt(aRule, 0);
aRule->SetStyleSheet(this);
DidDirty();
if (css::Rule::NAMESPACE_RULE == aRule->GetType()) {
// no api to prepend a namespace (ugh), release old ones and re-create them all
mInner->RebuildNameSpaces();
}
}
}
void
nsCSSStyleSheet::AppendStyleRule(css::Rule* aRule)
{
NS_PRECONDITION(nullptr != aRule, "null arg");
if (NS_SUCCEEDED(WillDirty())) {
mInner->mOrderedRules.AppendObject(aRule);
aRule->SetStyleSheet(this);
DidDirty();
if (css::Rule::NAMESPACE_RULE == aRule->GetType()) {
#ifdef DEBUG
nsresult rv =
#endif
RegisterNamespaceRule(aRule);
NS_WARN_IF_FALSE(NS_SUCCEEDED(rv),
"RegisterNamespaceRule returned error");
}
}
}
void
nsCSSStyleSheet::ReplaceStyleRule(css::Rule* aOld, css::Rule* aNew)
{
NS_PRECONDITION(mInner->mOrderedRules.Count() != 0, "can't have old rule");
NS_PRECONDITION(mInner->mComplete, "No replacing in an incomplete sheet!");
if (NS_SUCCEEDED(WillDirty())) {
int32_t index = mInner->mOrderedRules.IndexOf(aOld);
if (MOZ_UNLIKELY(index == -1)) {
NS_NOTREACHED("Couldn't find old rule");
return;
}
mInner->mOrderedRules.ReplaceObjectAt(aNew, index);
aNew->SetStyleSheet(this);
aOld->SetStyleSheet(nullptr);
DidDirty();
NS_ASSERTION(css::Rule::NAMESPACE_RULE != aNew->GetType(), "not yet implemented");
NS_ASSERTION(css::Rule::NAMESPACE_RULE != aOld->GetType(), "not yet implemented");
}
}
int32_t
nsCSSStyleSheet::StyleRuleCount() const
{
return mInner->mOrderedRules.Count();
}
nsresult
nsCSSStyleSheet::GetStyleRuleAt(int32_t aIndex, css::Rule*& aRule) const
{
// Important: If this function is ever made scriptable, we must add
// a security check here. See GetCssRules below for an example.
aRule = mInner->mOrderedRules.SafeObjectAt(aIndex);
if (aRule) {
NS_ADDREF(aRule);
return NS_OK;
}
return NS_ERROR_ILLEGAL_VALUE;
}
int32_t
nsCSSStyleSheet::StyleSheetCount() const
{
// XXX Far from an ideal way to do this, but the hope is that
// it won't be done too often. If it is, we might want to
// consider storing the children in an array.
int32_t count = 0;
const nsCSSStyleSheet* child = mInner->mFirstChild;
while (child) {
count++;
child = child->mNext;
}
return count;
}
nsCSSStyleSheet::EnsureUniqueInnerResult
nsCSSStyleSheet::EnsureUniqueInner()
{
mDirty = true;
NS_ABORT_IF_FALSE(mInner->mSheets.Length() != 0,
"unexpected number of outers");
if (mInner->mSheets.Length() == 1) {
return eUniqueInner_AlreadyUnique;
}
nsCSSStyleSheetInner* clone = mInner->CloneFor(this);
if (!clone) {
return eUniqueInner_CloneFailed;
}
mInner->RemoveSheet(this);
mInner = clone;
// otherwise the rule processor has pointers to the old rules
ClearRuleCascades();
return eUniqueInner_ClonedInner;
}
bool
nsCSSStyleSheet::AppendAllChildSheets(nsTArray<nsCSSStyleSheet*>& aArray)
{
for (nsCSSStyleSheet* child = mInner->mFirstChild; child;
child = child->mNext) {
if (!aArray.AppendElement(child)) {
return false;
}
}
return true;
}
already_AddRefed<nsCSSStyleSheet>
nsCSSStyleSheet::Clone(nsCSSStyleSheet* aCloneParent,
css::ImportRule* aCloneOwnerRule,
nsIDocument* aCloneDocument,
nsINode* aCloneOwningNode) const
{
nsCSSStyleSheet* clone = new nsCSSStyleSheet(*this,
aCloneParent,
aCloneOwnerRule,
aCloneDocument,
aCloneOwningNode);
NS_IF_ADDREF(clone);
return clone;
}
#ifdef DEBUG
static void
ListRules(const nsCOMArray<css::Rule>& aRules, FILE* aOut, int32_t aIndent)
{
for (int32_t index = aRules.Count() - 1; index >= 0; --index) {
aRules.ObjectAt(index)->List(aOut, aIndent);
}
}
struct ListEnumData {
ListEnumData(FILE* aOut, int32_t aIndent)
: mOut(aOut),
mIndent(aIndent)
{
}
FILE* mOut;
int32_t mIndent;
};
/* virtual */ void
nsCSSStyleSheet::List(FILE* out, int32_t aIndent) const
{
int32_t index;
// Indent
for (index = aIndent; --index >= 0; ) fputs(" ", out);
fputs("CSS Style Sheet: ", out);
nsAutoCString urlSpec;
nsresult rv = mInner->mSheetURI->GetSpec(urlSpec);
if (NS_SUCCEEDED(rv) && !urlSpec.IsEmpty()) {
fputs(urlSpec.get(), out);
}
if (mMedia) {
fputs(" media: ", out);
nsAutoString buffer;
mMedia->GetText(buffer);
fputs(NS_ConvertUTF16toUTF8(buffer).get(), out);
}
fputs("\n", out);
for (const nsCSSStyleSheet* child = mInner->mFirstChild;
child;
child = child->mNext) {
child->List(out, aIndent + 1);
}
fputs("Rules in source order:\n", out);
ListRules(mInner->mOrderedRules, out, aIndent);
}
#endif
void
nsCSSStyleSheet::ClearRuleCascades()
{
if (mRuleProcessors) {
nsCSSRuleProcessor **iter = mRuleProcessors->Elements(),
**end = iter + mRuleProcessors->Length();
for(; iter != end; ++iter) {
(*iter)->ClearRuleCascades();
}
}
if (mParent) {
nsCSSStyleSheet* parent = (nsCSSStyleSheet*)mParent;
parent->ClearRuleCascades();
}
}
nsresult
nsCSSStyleSheet::WillDirty()
{
if (!mInner->mComplete) {
// Do nothing
return NS_OK;
}
if (EnsureUniqueInner() == eUniqueInner_CloneFailed) {
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
void
nsCSSStyleSheet::DidDirty()
{
NS_ABORT_IF_FALSE(!mInner->mComplete || mDirty,
"caller must have called WillDirty()");
ClearRuleCascades();
}
nsresult
nsCSSStyleSheet::SubjectSubsumesInnerPrincipal()
{
// Get the security manager and do the subsumes check
nsIScriptSecurityManager *securityManager =
nsContentUtils::GetSecurityManager();
nsCOMPtr<nsIPrincipal> subjectPrincipal;
nsresult rv = securityManager->GetSubjectPrincipal(getter_AddRefs(subjectPrincipal));
NS_ENSURE_SUCCESS(rv, rv);
if (!subjectPrincipal) {
return NS_ERROR_DOM_SECURITY_ERR;
}
bool subsumes;
rv = subjectPrincipal->Subsumes(mInner->mPrincipal, &subsumes);
NS_ENSURE_SUCCESS(rv, rv);
if (subsumes) {
return NS_OK;
}
if (!nsContentUtils::IsCallerChrome()) {
// Allow access only if CORS mode is not NONE
if (GetCORSMode() == CORS_NONE) {
return NS_ERROR_DOM_SECURITY_ERR;
}
// Now make sure we set the principal of our inner to the
// subjectPrincipal. That means we need a unique inner, of
// course. But we don't want to do that if we're not complete
// yet. Luckily, all the callers of this method throw anyway if
// not complete, so we can just do that here too.
if (!mInner->mComplete) {
return NS_ERROR_DOM_INVALID_ACCESS_ERR;
}
rv = WillDirty();
NS_ENSURE_SUCCESS(rv, rv);
mInner->mPrincipal = subjectPrincipal;
DidDirty();
}
return NS_OK;
}
nsresult
nsCSSStyleSheet::RegisterNamespaceRule(css::Rule* aRule)
{
if (!mInner->mNameSpaceMap) {
nsresult rv = mInner->CreateNamespaceMap();
NS_ENSURE_SUCCESS(rv, rv);
}
AddNamespaceRuleToMap(aRule, mInner->mNameSpaceMap);
return NS_OK;
}
// nsIDOMStyleSheet interface
NS_IMETHODIMP
nsCSSStyleSheet::GetType(nsAString& aType)
{
aType.AssignLiteral("text/css");
return NS_OK;
}
NS_IMETHODIMP
nsCSSStyleSheet::GetDisabled(bool* aDisabled)
{
*aDisabled = Disabled();
return NS_OK;
}
NS_IMETHODIMP
nsCSSStyleSheet::SetDisabled(bool aDisabled)
{
// DOM method, so handle BeginUpdate/EndUpdate
MOZ_AUTO_DOC_UPDATE(mDocument, UPDATE_STYLE, true);
nsCSSStyleSheet::SetEnabled(!aDisabled);
return NS_OK;
}
NS_IMETHODIMP
nsCSSStyleSheet::GetOwnerNode(nsIDOMNode** aOwnerNode)
{
nsCOMPtr<nsIDOMNode> ownerNode = do_QueryInterface(GetOwnerNode());
ownerNode.forget(aOwnerNode);
return NS_OK;
}
NS_IMETHODIMP
nsCSSStyleSheet::GetParentStyleSheet(nsIDOMStyleSheet** aParentStyleSheet)
{
NS_ENSURE_ARG_POINTER(aParentStyleSheet);
NS_IF_ADDREF(*aParentStyleSheet = mParent);
return NS_OK;
}
NS_IMETHODIMP
nsCSSStyleSheet::GetHref(nsAString& aHref)
{
if (mInner->mOriginalSheetURI) {
nsAutoCString str;
mInner->mOriginalSheetURI->GetSpec(str);
CopyUTF8toUTF16(str, aHref);
} else {
SetDOMStringToNull(aHref);
}
return NS_OK;
}
/* virtual */ void
nsCSSStyleSheet::GetTitle(nsString& aTitle) const
{
aTitle = mTitle;
}
NS_IMETHODIMP
nsCSSStyleSheet::GetTitle(nsAString& aTitle)
{
aTitle.Assign(mTitle);
return NS_OK;
}
NS_IMETHODIMP
nsCSSStyleSheet::GetMedia(nsIDOMMediaList** aMedia)
{
NS_ADDREF(*aMedia = Media());
return NS_OK;
}
nsIDOMMediaList*
nsCSSStyleSheet::Media()
{
if (!mMedia) {
mMedia = new nsMediaList();
mMedia->SetStyleSheet(this);
}
return mMedia;
}
NS_IMETHODIMP
nsCSSStyleSheet::GetOwnerRule(nsIDOMCSSRule** aOwnerRule)
{
NS_IF_ADDREF(*aOwnerRule = GetOwnerRule());
return NS_OK;
}
nsIDOMCSSRule*
nsCSSStyleSheet::GetDOMOwnerRule() const
{
return mOwnerRule ? mOwnerRule->GetDOMRule() : nullptr;
}
NS_IMETHODIMP
nsCSSStyleSheet::GetCssRules(nsIDOMCSSRuleList** aCssRules)
{
ErrorResult rv;
nsCOMPtr<nsIDOMCSSRuleList> rules = GetCssRules(rv);
rules.forget(aCssRules);
return rv.ErrorCode();
}
nsIDOMCSSRuleList*
nsCSSStyleSheet::GetCssRules(ErrorResult& aRv)
{
// No doing this on incomplete sheets!
if (!mInner->mComplete) {
aRv.Throw(NS_ERROR_DOM_INVALID_ACCESS_ERR);
return nullptr;
}
//-- Security check: Only scripts whose principal subsumes that of the
// style sheet can access rule collections.
nsresult rv = SubjectSubsumesInnerPrincipal();
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return nullptr;
}
// OK, security check passed, so get the rule collection
if (!mRuleCollection) {
mRuleCollection = new CSSRuleListImpl(this);
}
return mRuleCollection;
}
NS_IMETHODIMP
nsCSSStyleSheet::InsertRule(const nsAString& aRule,
uint32_t aIndex,
uint32_t* aReturn)
{
//-- Security check: Only scripts whose principal subsumes that of the
// style sheet can modify rule collections.
nsresult rv = SubjectSubsumesInnerPrincipal();
NS_ENSURE_SUCCESS(rv, rv);
return InsertRuleInternal(aRule, aIndex, aReturn);
}
static bool
RuleHasPendingChildSheet(css::Rule *cssRule)
{
nsCOMPtr<nsIDOMCSSImportRule> importRule(do_QueryInterface(cssRule));
NS_ASSERTION(importRule, "Rule which has type IMPORT_RULE and does not implement nsIDOMCSSImportRule!");
nsCOMPtr<nsIDOMCSSStyleSheet> childSheet;
importRule->GetStyleSheet(getter_AddRefs(childSheet));
nsRefPtr<nsCSSStyleSheet> cssSheet = do_QueryObject(childSheet);
return cssSheet != nullptr && !cssSheet->IsComplete();
}
nsresult
nsCSSStyleSheet::InsertRuleInternal(const nsAString& aRule,
uint32_t aIndex,
uint32_t* aReturn)
{
// No doing this if the sheet is not complete!
if (!mInner->mComplete) {
return NS_ERROR_DOM_INVALID_ACCESS_ERR;
}
nsresult result;
result = WillDirty();
if (NS_FAILED(result))
return result;
if (aIndex > uint32_t(mInner->mOrderedRules.Count()))
return NS_ERROR_DOM_INDEX_SIZE_ERR;
NS_ASSERTION(uint32_t(mInner->mOrderedRules.Count()) <= INT32_MAX,
"Too many style rules!");
// Hold strong ref to the CSSLoader in case the document update
// kills the document
nsRefPtr<css::Loader> loader;
if (mDocument) {
loader = mDocument->CSSLoader();
NS_ASSERTION(loader, "Document with no CSS loader!");
}
nsCSSParser css(loader, this);
mozAutoDocUpdate updateBatch(mDocument, UPDATE_STYLE, true);
nsRefPtr<css::Rule> rule;
result = css.ParseRule(aRule, mInner->mSheetURI, mInner->mBaseURI,
mInner->mPrincipal, getter_AddRefs(rule));
if (NS_FAILED(result))
return result;
// Hierarchy checking.
int32_t newType = rule->GetType();
// check that we're not inserting before a charset rule
css::Rule* nextRule = mInner->mOrderedRules.SafeObjectAt(aIndex);
if (nextRule) {
int32_t nextType = nextRule->GetType();
if (nextType == css::Rule::CHARSET_RULE) {
return NS_ERROR_DOM_HIERARCHY_REQUEST_ERR;
}
if (nextType == css::Rule::IMPORT_RULE &&
newType != css::Rule::CHARSET_RULE &&
newType != css::Rule::IMPORT_RULE) {
return NS_ERROR_DOM_HIERARCHY_REQUEST_ERR;
}
if (nextType == css::Rule::NAMESPACE_RULE &&
newType != css::Rule::CHARSET_RULE &&
newType != css::Rule::IMPORT_RULE &&
newType != css::Rule::NAMESPACE_RULE) {
return NS_ERROR_DOM_HIERARCHY_REQUEST_ERR;
}
}
if (aIndex != 0) {
// no inserting charset at nonzero position
if (newType == css::Rule::CHARSET_RULE) {
return NS_ERROR_DOM_HIERARCHY_REQUEST_ERR;
}
css::Rule* prevRule = mInner->mOrderedRules.SafeObjectAt(aIndex - 1);
int32_t prevType = prevRule->GetType();
if (newType == css::Rule::IMPORT_RULE &&
prevType != css::Rule::CHARSET_RULE &&
prevType != css::Rule::IMPORT_RULE) {
return NS_ERROR_DOM_HIERARCHY_REQUEST_ERR;
}
if (newType == css::Rule::NAMESPACE_RULE &&
prevType != css::Rule::CHARSET_RULE &&
prevType != css::Rule::IMPORT_RULE &&
prevType != css::Rule::NAMESPACE_RULE) {
return NS_ERROR_DOM_HIERARCHY_REQUEST_ERR;
}
}
bool insertResult = mInner->mOrderedRules.InsertObjectAt(rule, aIndex);
NS_ENSURE_TRUE(insertResult, NS_ERROR_OUT_OF_MEMORY);
DidDirty();
rule->SetStyleSheet(this);
int32_t type = rule->GetType();
if (type == css::Rule::NAMESPACE_RULE) {
// XXXbz does this screw up when inserting a namespace rule before
// another namespace rule that binds the same prefix to a different
// namespace?
result = RegisterNamespaceRule(rule);
NS_ENSURE_SUCCESS(result, result);
}
// We don't notify immediately for @import rules, but rather when
// the sheet the rule is importing is loaded (see StyleSheetLoaded)
if ((type != css::Rule::IMPORT_RULE || !RuleHasPendingChildSheet(rule)) &&
mDocument) {
mDocument->StyleRuleAdded(this, rule);
}
*aReturn = aIndex;
return NS_OK;
}
NS_IMETHODIMP
nsCSSStyleSheet::DeleteRule(uint32_t aIndex)
{
nsresult result = NS_ERROR_DOM_INDEX_SIZE_ERR;
// No doing this if the sheet is not complete!
if (!mInner->mComplete) {
return NS_ERROR_DOM_INVALID_ACCESS_ERR;
}
//-- Security check: Only scripts whose principal subsumes that of the
// style sheet can modify rule collections.
nsresult rv = SubjectSubsumesInnerPrincipal();
NS_ENSURE_SUCCESS(rv, rv);
// XXX TBI: handle @rule types
mozAutoDocUpdate updateBatch(mDocument, UPDATE_STYLE, true);
result = WillDirty();
if (NS_SUCCEEDED(result)) {
if (aIndex >= uint32_t(mInner->mOrderedRules.Count()))
return NS_ERROR_DOM_INDEX_SIZE_ERR;
NS_ASSERTION(uint32_t(mInner->mOrderedRules.Count()) <= INT32_MAX,
"Too many style rules!");
// Hold a strong ref to the rule so it doesn't die when we RemoveObjectAt
nsRefPtr<css::Rule> rule = mInner->mOrderedRules.ObjectAt(aIndex);
if (rule) {
mInner->mOrderedRules.RemoveObjectAt(aIndex);
rule->SetStyleSheet(nullptr);
DidDirty();
if (mDocument) {
mDocument->StyleRuleRemoved(this, rule);
}
}
}
return result;
}
nsresult
nsCSSStyleSheet::DeleteRuleFromGroup(css::GroupRule* aGroup, uint32_t aIndex)
{
NS_ENSURE_ARG_POINTER(aGroup);
NS_ASSERTION(mInner->mComplete, "No deleting from an incomplete sheet!");
nsresult result;
nsRefPtr<css::Rule> rule = aGroup->GetStyleRuleAt(aIndex);
NS_ENSURE_TRUE(rule, NS_ERROR_ILLEGAL_VALUE);
// check that the rule actually belongs to this sheet!
if (this != rule->GetStyleSheet()) {
return NS_ERROR_INVALID_ARG;
}
mozAutoDocUpdate updateBatch(mDocument, UPDATE_STYLE, true);
result = WillDirty();
NS_ENSURE_SUCCESS(result, result);
result = aGroup->DeleteStyleRuleAt(aIndex);
NS_ENSURE_SUCCESS(result, result);
rule->SetStyleSheet(nullptr);
DidDirty();
if (mDocument) {
mDocument->StyleRuleRemoved(this, rule);
}
return NS_OK;
}
nsresult
nsCSSStyleSheet::InsertRuleIntoGroup(const nsAString & aRule,
css::GroupRule* aGroup,
uint32_t aIndex,
uint32_t* _retval)
{
nsresult result;
NS_ASSERTION(mInner->mComplete, "No inserting into an incomplete sheet!");
// check that the group actually belongs to this sheet!
if (this != aGroup->GetStyleSheet()) {
return NS_ERROR_INVALID_ARG;
}
// Hold strong ref to the CSSLoader in case the document update
// kills the document
nsRefPtr<css::Loader> loader;
if (mDocument) {
loader = mDocument->CSSLoader();
NS_ASSERTION(loader, "Document with no CSS loader!");
}
nsCSSParser css(loader, this);
// parse and grab the rule
mozAutoDocUpdate updateBatch(mDocument, UPDATE_STYLE, true);
result = WillDirty();
NS_ENSURE_SUCCESS(result, result);
nsRefPtr<css::Rule> rule;
result = css.ParseRule(aRule, mInner->mSheetURI, mInner->mBaseURI,
mInner->mPrincipal, getter_AddRefs(rule));
if (NS_FAILED(result))
return result;
switch (rule->GetType()) {
case css::Rule::STYLE_RULE:
case css::Rule::MEDIA_RULE:
case css::Rule::FONT_FACE_RULE:
case css::Rule::PAGE_RULE:
case css::Rule::KEYFRAMES_RULE:
case css::Rule::DOCUMENT_RULE:
case css::Rule::SUPPORTS_RULE:
// these types are OK to insert into a group
break;
case css::Rule::CHARSET_RULE:
case css::Rule::IMPORT_RULE:
case css::Rule::NAMESPACE_RULE:
// these aren't
return NS_ERROR_DOM_HIERARCHY_REQUEST_ERR;
default:
NS_NOTREACHED("unexpected rule type");
return NS_ERROR_DOM_HIERARCHY_REQUEST_ERR;
}
result = aGroup->InsertStyleRuleAt(aIndex, rule);
NS_ENSURE_SUCCESS(result, result);
DidDirty();
if (mDocument) {
mDocument->StyleRuleAdded(this, rule);
}
*_retval = aIndex;
return NS_OK;
}
nsresult
nsCSSStyleSheet::ReplaceRuleInGroup(css::GroupRule* aGroup,
css::Rule* aOld, css::Rule* aNew)
{
nsresult result;
NS_PRECONDITION(mInner->mComplete, "No replacing in an incomplete sheet!");
NS_ASSERTION(this == aGroup->GetStyleSheet(), "group doesn't belong to this sheet");
result = WillDirty();
NS_ENSURE_SUCCESS(result, result);
result = aGroup->ReplaceStyleRule(aOld, aNew);
DidDirty();
return result;
}
// nsICSSLoaderObserver implementation
NS_IMETHODIMP
nsCSSStyleSheet::StyleSheetLoaded(nsCSSStyleSheet* aSheet,
bool aWasAlternate,
nsresult aStatus)
{
if (aSheet->GetParentSheet() == nullptr) {
return NS_OK; // ignore if sheet has been detached already (see parseSheet)
}
NS_ASSERTION(this == aSheet->GetParentSheet(),
"We are being notified of a sheet load for a sheet that is not our child!");
if (mDocument && NS_SUCCEEDED(aStatus)) {
mozAutoDocUpdate updateBatch(mDocument, UPDATE_STYLE, true);
// XXXldb @import rules shouldn't even implement nsIStyleRule (but
// they do)!
mDocument->StyleRuleAdded(this, aSheet->GetOwnerRule());
}
return NS_OK;
}
nsresult
nsCSSStyleSheet::ParseSheet(const nsAString& aInput)
{
// Not doing this if the sheet is not complete!
if (!mInner->mComplete) {
return NS_ERROR_DOM_INVALID_ACCESS_ERR;
}
// Hold strong ref to the CSSLoader in case the document update
// kills the document
nsRefPtr<css::Loader> loader;
if (mDocument) {
loader = mDocument->CSSLoader();
NS_ASSERTION(loader, "Document with no CSS loader!");
} else {
loader = new css::Loader();
}
mozAutoDocUpdate updateBatch(mDocument, UPDATE_STYLE, true);
nsresult rv = WillDirty();
NS_ENSURE_SUCCESS(rv, rv);
// detach existing rules (including child sheets via import rules)
int ruleCount;
while ((ruleCount = mInner->mOrderedRules.Count()) != 0) {
nsRefPtr<css::Rule> rule = mInner->mOrderedRules.ObjectAt(ruleCount - 1);
mInner->mOrderedRules.RemoveObjectAt(ruleCount - 1);
rule->SetStyleSheet(nullptr);
if (mDocument) {
mDocument->StyleRuleRemoved(this, rule);
}
}
// nuke child sheets list and current namespace map
for (nsCSSStyleSheet* child = mInner->mFirstChild; child; child = child->mNext) {
NS_ASSERTION(child->mParent == this, "Child sheet is not parented to this!");
child->mParent = nullptr;
child->mDocument = nullptr;
}
mInner->mFirstChild = nullptr;
mInner->mNameSpaceMap = nullptr;
// allow unsafe rules if the style sheet's principal is the system principal
bool allowUnsafeRules = nsContentUtils::IsSystemPrincipal(mInner->mPrincipal);
nsCSSParser parser(loader, this);
rv = parser.ParseSheet(aInput, mInner->mSheetURI, mInner->mBaseURI,
mInner->mPrincipal, 1, allowUnsafeRules);
DidDirty(); // we are always 'dirty' here since we always remove rules first
NS_ENSURE_SUCCESS(rv, rv);
// notify document of all new rules
if (mDocument) {
for (int32_t index = 0; index < mInner->mOrderedRules.Count(); ++index) {
nsRefPtr<css::Rule> rule = mInner->mOrderedRules.ObjectAt(index);
if (rule->GetType() == css::Rule::IMPORT_RULE &&
RuleHasPendingChildSheet(rule)) {
continue; // notify when loaded (see StyleSheetLoaded)
}
mDocument->StyleRuleAdded(this, rule);
}
}
return NS_OK;
}
/* virtual */ nsIURI*
nsCSSStyleSheet::GetOriginalURI() const
{
return mInner->mOriginalSheetURI;
}
/* virtual */
JSObject*
nsCSSStyleSheet::WrapObject(JSContext* aCx, JSObject* aScope)
{
return CSSStyleSheetBinding::Wrap(aCx, aScope, this);
}
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