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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
/* base class for DOM objects for element.style and cssStyleRule.style */
#include "nsDOMCSSDeclaration.h"
#include "mozilla/DeclarationBlock.h"
#include "mozilla/ProfilerLabels.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/css/Rule.h"
#include "mozilla/dom/CSS2PropertiesBinding.h"
#include "mozilla/dom/MutationEventBinding.h"
#include "nsCSSProps.h"
#include "nsCOMPtr.h"
#include "mozAutoDocUpdate.h"
#include "mozilla/dom/BindingUtils.h"
#include "nsQueryObject.h"
using namespace mozilla;
using namespace mozilla::dom;
nsDOMCSSDeclaration::~nsDOMCSSDeclaration() = default;
/* virtual */
JSObject* nsDOMCSSDeclaration::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return CSS2Properties_Binding::Wrap(aCx, this, aGivenProto);
}
NS_IMPL_QUERY_INTERFACE(nsDOMCSSDeclaration, nsICSSDeclaration)
void nsDOMCSSDeclaration::GetPropertyValue(const nsCSSPropertyID aPropID,
nsACString& aValue) {
MOZ_ASSERT(aPropID != eCSSProperty_UNKNOWN,
"Should never pass eCSSProperty_UNKNOWN around");
MOZ_ASSERT(aValue.IsEmpty());
if (DeclarationBlock* decl =
GetOrCreateCSSDeclaration(Operation::Read, nullptr)) {
decl->GetPropertyValueByID(aPropID, aValue);
}
}
void nsDOMCSSDeclaration::SetPropertyValue(const nsCSSPropertyID aPropID,
const nsACString& aValue,
nsIPrincipal* aSubjectPrincipal,
ErrorResult& aRv) {
if (IsReadOnly()) {
return;
}
if (aValue.IsEmpty()) {
// If the new value of the property is an empty string we remove the
// property.
return RemovePropertyInternal(aPropID, aRv);
}
aRv = ParsePropertyValue(aPropID, aValue, false, aSubjectPrincipal);
}
void nsDOMCSSDeclaration::GetCssText(nsACString& aCssText) {
MOZ_ASSERT(aCssText.IsEmpty());
if (auto* decl = GetOrCreateCSSDeclaration(Operation::Read, nullptr)) {
decl->ToString(aCssText);
}
}
void nsDOMCSSDeclaration::SetCssText(const nsACString& aCssText,
nsIPrincipal* aSubjectPrincipal,
ErrorResult& aRv) {
if (IsReadOnly()) {
return;
}
// We don't need to *do* anything with the old declaration, but we need
// to ensure that it exists, or else SetCSSDeclaration may crash.
RefPtr<DeclarationBlock> created;
DeclarationBlock* olddecl =
GetOrCreateCSSDeclaration(Operation::Modify, getter_AddRefs(created));
if (!olddecl) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return;
}
// For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
// Attribute setting code, which leads in turn to BeginUpdate. We
// need to start the update now so that the old rule doesn't get used
// between when we mutate the declaration and when we set the new
mozAutoDocUpdate autoUpdate(DocToUpdate(), true);
DeclarationBlockMutationClosure closure = {};
MutationClosureData closureData;
GetPropertyChangeClosure(&closure, &closureData);
ParsingEnvironment servoEnv = GetParsingEnvironment(aSubjectPrincipal);
if (!servoEnv.mUrlExtraData) {
aRv.Throw(NS_ERROR_NOT_AVAILABLE);
return;
}
// Need to special case closure calling here, since parsing css text
// doesn't modify any existing declaration and that is why the callback isn't
// called implicitly.
if (closure.function && !closureData.mWasCalled) {
closure.function(&closureData, eCSSProperty_UNKNOWN);
}
RefPtr<DeclarationBlock> newdecl = DeclarationBlock::FromCssText(
aCssText, servoEnv.mUrlExtraData, servoEnv.mCompatMode, servoEnv.mLoader,
servoEnv.mRuleType);
aRv = SetCSSDeclaration(newdecl, &closureData);
}
uint32_t nsDOMCSSDeclaration::Length() {
DeclarationBlock* decl = GetOrCreateCSSDeclaration(Operation::Read, nullptr);
if (decl) {
return decl->Count();
}
return 0;
}
void nsDOMCSSDeclaration::IndexedGetter(uint32_t aIndex, bool& aFound,
nsACString& aPropName) {
DeclarationBlock* decl = GetOrCreateCSSDeclaration(Operation::Read, nullptr);
aFound = decl && decl->GetNthProperty(aIndex, aPropName);
}
void nsDOMCSSDeclaration::GetPropertyValue(const nsACString& aPropertyName,
nsACString& aReturn) {
MOZ_ASSERT(aReturn.IsEmpty());
if (auto* decl = GetOrCreateCSSDeclaration(Operation::Read, nullptr)) {
decl->GetPropertyValue(aPropertyName, aReturn);
}
}
void nsDOMCSSDeclaration::GetPropertyPriority(const nsACString& aPropertyName,
nsACString& aPriority) {
MOZ_ASSERT(aPriority.IsEmpty());
DeclarationBlock* decl = GetOrCreateCSSDeclaration(Operation::Read, nullptr);
if (decl && decl->GetPropertyIsImportant(aPropertyName)) {
aPriority.AssignLiteral("important");
}
}
void nsDOMCSSDeclaration::SetProperty(const nsACString& aPropertyName,
const nsACString& aValue,
const nsACString& aPriority,
nsIPrincipal* aSubjectPrincipal,
ErrorResult& aRv) {
if (IsReadOnly()) {
return;
}
if (aValue.IsEmpty()) {
// If the new value of the property is an empty string we remove the
// property.
// XXX this ignores the priority string, should it?
return RemovePropertyInternal(aPropertyName, aRv);
}
// In the common (and fast) cases we can use the property id
nsCSSPropertyID propID = nsCSSProps::LookupProperty(aPropertyName);
if (propID == eCSSProperty_UNKNOWN) {
return;
}
bool important;
if (aPriority.IsEmpty()) {
important = false;
} else if (aPriority.LowerCaseEqualsASCII("important")) {
important = true;
} else {
// XXX silent failure?
return;
}
if (propID == eCSSPropertyExtra_variable) {
aRv = ParseCustomPropertyValue(aPropertyName, aValue, important,
aSubjectPrincipal);
return;
}
aRv = ParsePropertyValue(propID, aValue, important, aSubjectPrincipal);
}
void nsDOMCSSDeclaration::RemoveProperty(const nsACString& aPropertyName,
nsACString& aReturn,
ErrorResult& aRv) {
if (IsReadOnly()) {
return;
}
GetPropertyValue(aPropertyName, aReturn);
RemovePropertyInternal(aPropertyName, aRv);
}
/* static */ nsDOMCSSDeclaration::ParsingEnvironment
nsDOMCSSDeclaration::GetParsingEnvironmentForRule(const css::Rule* aRule,
StyleCssRuleType aRuleType) {
if (!aRule) {
return {};
}
MOZ_ASSERT(aRule->Type() == aRuleType);
StyleSheet* sheet = aRule->GetStyleSheet();
if (!sheet) {
return {};
}
if (Document* document = sheet->GetAssociatedDocument()) {
return {
sheet->URLData(),
document->GetCompatibilityMode(),
document->CSSLoader(),
aRuleType,
};
}
return {
sheet->URLData(),
eCompatibility_FullStandards,
nullptr,
aRuleType,
};
}
template <typename Func>
nsresult nsDOMCSSDeclaration::ModifyDeclaration(
nsIPrincipal* aSubjectPrincipal, MutationClosureData* aClosureData,
Func aFunc) {
RefPtr<DeclarationBlock> created;
DeclarationBlock* olddecl =
GetOrCreateCSSDeclaration(Operation::Modify, getter_AddRefs(created));
if (!olddecl) {
return NS_ERROR_NOT_AVAILABLE;
}
// For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
// Attribute setting code, which leads in turn to BeginUpdate. We
// need to start the update now so that the old rule doesn't get used
// between when we mutate the declaration and when we set the new
mozAutoDocUpdate autoUpdate(DocToUpdate(), true);
RefPtr<DeclarationBlock> decl = olddecl->EnsureMutable();
bool changed;
ParsingEnvironment servoEnv = GetParsingEnvironment(aSubjectPrincipal);
if (!servoEnv.mUrlExtraData) {
return NS_ERROR_NOT_AVAILABLE;
}
changed = aFunc(decl, servoEnv);
if (!changed) {
// Parsing failed -- but we don't throw an exception for that.
return NS_OK;
}
return SetCSSDeclaration(decl, aClosureData);
}
nsresult nsDOMCSSDeclaration::ParsePropertyValue(
const nsCSSPropertyID aPropID, const nsACString& aPropValue,
bool aIsImportant, nsIPrincipal* aSubjectPrincipal) {
AUTO_PROFILER_LABEL_CATEGORY_PAIR_RELEVANT_FOR_JS(LAYOUT_CSSParsing);
if (IsReadOnly()) {
return NS_OK;
}
DeclarationBlockMutationClosure closure = {};
MutationClosureData closureData;
GetPropertyChangeClosure(&closure, &closureData);
return ModifyDeclaration(
aSubjectPrincipal, &closureData,
[&](DeclarationBlock* decl, ParsingEnvironment& env) {
return Servo_DeclarationBlock_SetPropertyById(
decl->Raw(), aPropID, &aPropValue, aIsImportant, env.mUrlExtraData,
StyleParsingMode::DEFAULT, env.mCompatMode, env.mLoader,
env.mRuleType, closure);
});
}
nsresult nsDOMCSSDeclaration::ParseCustomPropertyValue(
const nsACString& aPropertyName, const nsACString& aPropValue,
bool aIsImportant, nsIPrincipal* aSubjectPrincipal) {
MOZ_ASSERT(nsCSSProps::IsCustomPropertyName(aPropertyName));
if (IsReadOnly()) {
return NS_OK;
}
DeclarationBlockMutationClosure closure = {};
MutationClosureData closureData;
GetPropertyChangeClosure(&closure, &closureData);
return ModifyDeclaration(
aSubjectPrincipal, &closureData,
[&](DeclarationBlock* decl, ParsingEnvironment& env) {
return Servo_DeclarationBlock_SetProperty(
decl->Raw(), &aPropertyName, &aPropValue, aIsImportant,
env.mUrlExtraData, StyleParsingMode::DEFAULT, env.mCompatMode,
env.mLoader, env.mRuleType, closure);
});
}
void nsDOMCSSDeclaration::RemovePropertyInternal(nsCSSPropertyID aPropID,
ErrorResult& aRv) {
DeclarationBlock* olddecl =
GetOrCreateCSSDeclaration(Operation::RemoveProperty, nullptr);
if (IsReadOnly()) {
return;
}
if (!olddecl) {
return; // no decl, so nothing to remove
}
// For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
// Attribute setting code, which leads in turn to BeginUpdate. We
// need to start the update now so that the old rule doesn't get used
// between when we mutate the declaration and when we set the new
mozAutoDocUpdate autoUpdate(DocToUpdate(), true);
DeclarationBlockMutationClosure closure = {};
MutationClosureData closureData;
GetPropertyChangeClosure(&closure, &closureData);
RefPtr<DeclarationBlock> decl = olddecl->EnsureMutable();
if (!decl->RemovePropertyByID(aPropID, closure)) {
return;
}
aRv = SetCSSDeclaration(decl, &closureData);
}
void nsDOMCSSDeclaration::RemovePropertyInternal(
const nsACString& aPropertyName, ErrorResult& aRv) {
if (IsReadOnly()) {
return;
}
DeclarationBlock* olddecl =
GetOrCreateCSSDeclaration(Operation::RemoveProperty, nullptr);
if (!olddecl) {
return; // no decl, so nothing to remove
}
// For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
// Attribute setting code, which leads in turn to BeginUpdate. We
// need to start the update now so that the old rule doesn't get used
// between when we mutate the declaration and when we set the new
mozAutoDocUpdate autoUpdate(DocToUpdate(), true);
DeclarationBlockMutationClosure closure = {};
MutationClosureData closureData;
GetPropertyChangeClosure(&closure, &closureData);
RefPtr<DeclarationBlock> decl = olddecl->EnsureMutable();
if (!decl->RemoveProperty(aPropertyName, closure)) {
return;
}
aRv = SetCSSDeclaration(decl, &closureData);
}