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-rw-r--r--layout/style/nsDOMCSSDeclaration.cpp381
1 files changed, 381 insertions, 0 deletions
diff --git a/layout/style/nsDOMCSSDeclaration.cpp b/layout/style/nsDOMCSSDeclaration.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/. */
+
+/* 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)
+
+nsresult 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);
+ }
+ return NS_OK;
+}
+
+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
+ // rule (see stack in bug 209575).
+ 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);
+}
+
+NS_IMETHODIMP
+nsDOMCSSDeclaration::GetPropertyValue(const nsACString& aPropertyName,
+ nsACString& aReturn) {
+ MOZ_ASSERT(aReturn.IsEmpty());
+ if (auto* decl = GetOrCreateCSSDeclaration(Operation::Read, nullptr)) {
+ decl->GetPropertyValue(aPropertyName, aReturn);
+ }
+ return NS_OK;
+}
+
+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;
+ }
+
+ nsresult rv = GetPropertyValue(aPropertyName, aReturn);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ aRv.Throw(rv);
+ return;
+ }
+ 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
+ // rule (see stack in bug 209575).
+ 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,
+ ParsingMode::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, ParsingMode::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
+ // rule (see stack in bug 209575).
+ 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
+ // rule (see stack in bug 209575).
+ 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);
+}