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Diffstat (limited to '')
| -rw-r--r-- | layout/style/nsDOMCSSDeclaration.cpp | 381 |
1 files changed, 381 insertions, 0 deletions
diff --git a/layout/style/nsDOMCSSDeclaration.cpp b/layout/style/nsDOMCSSDeclaration.cpp new file mode 100644 index 0000000000..2b55fd21fb --- /dev/null +++ b/layout/style/nsDOMCSSDeclaration.cpp @@ -0,0 +1,381 @@ +/* -*- 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); +} |