/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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/. */ /* base class for DOM objects for element.style and cssStyleRule.style */ #include "nsDOMCSSDeclaration.h" #include "nsCSSParser.h" #include "mozilla/DeclarationBlockInlines.h" #include "mozilla/StyleSheetInlines.h" #include "mozilla/css/Rule.h" #include "mozilla/DeclarationBlockInlines.h" #include "mozilla/dom/CSS2PropertiesBinding.h" #include "nsCSSProps.h" #include "nsCOMPtr.h" #include "mozAutoDocUpdate.h" #include "nsIURI.h" #include "mozilla/dom/BindingUtils.h" #include "nsContentUtils.h" #include "nsQueryObject.h" #include "mozilla/layers/ScrollLinkedEffectDetector.h" using namespace mozilla; nsDOMCSSDeclaration::~nsDOMCSSDeclaration() { } /* virtual */ JSObject* nsDOMCSSDeclaration::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) { return dom::CSS2PropertiesBinding::Wrap(aCx, this, aGivenProto); } NS_INTERFACE_TABLE_HEAD(nsDOMCSSDeclaration) NS_INTERFACE_TABLE(nsDOMCSSDeclaration, nsICSSDeclaration, nsIDOMCSSStyleDeclaration) NS_INTERFACE_TABLE_TO_MAP_SEGUE NS_INTERFACE_MAP_END NS_IMETHODIMP nsDOMCSSDeclaration::GetPropertyValue(const nsCSSPropertyID aPropID, nsAString& aValue) { NS_PRECONDITION(aPropID != eCSSProperty_UNKNOWN, "Should never pass eCSSProperty_UNKNOWN around"); aValue.Truncate(); if (DeclarationBlock* decl = GetCSSDeclaration(eOperation_Read)) { decl->GetPropertyValueByID(aPropID, aValue); } return NS_OK; } NS_IMETHODIMP nsDOMCSSDeclaration::SetPropertyValue(const nsCSSPropertyID aPropID, const nsAString& aValue) { switch (aPropID) { case eCSSProperty_background_position: case eCSSProperty_background_position_x: case eCSSProperty_background_position_y: case eCSSProperty_transform: case eCSSProperty_top: case eCSSProperty_left: case eCSSProperty_bottom: case eCSSProperty_right: case eCSSProperty_margin: case eCSSProperty_margin_top: case eCSSProperty_margin_left: case eCSSProperty_margin_bottom: case eCSSProperty_margin_right: case eCSSProperty_margin_inline_start: case eCSSProperty_margin_inline_end: case eCSSProperty_margin_block_start: case eCSSProperty_margin_block_end: mozilla::layers::ScrollLinkedEffectDetector::PositioningPropertyMutated(); break; default: break; } if (aValue.IsEmpty()) { // If the new value of the property is an empty string we remove the // property. return RemovePropertyInternal(aPropID); } return ParsePropertyValue(aPropID, aValue, false); } NS_IMETHODIMP nsDOMCSSDeclaration::GetCssText(nsAString& aCssText) { DeclarationBlock* decl = GetCSSDeclaration(eOperation_Read); aCssText.Truncate(); if (decl) { decl->ToString(aCssText); } return NS_OK; } NS_IMETHODIMP nsDOMCSSDeclaration::SetCssText(const nsAString& aCssText) { // We don't need to *do* anything with the old declaration, but we need // to ensure that it exists, or else SetCSSDeclaration may crash. DeclarationBlock* olddecl = GetCSSDeclaration(eOperation_Modify); if (!olddecl) { return NS_ERROR_NOT_AVAILABLE; } CSSParsingEnvironment env; GetCSSParsingEnvironment(env); if (!env.mPrincipal) { 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). mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true); RefPtr<DeclarationBlock> newdecl; if (olddecl->IsServo()) { newdecl = ServoDeclarationBlock::FromCssText(aCssText); } else { RefPtr<css::Declaration> decl(new css::Declaration()); decl->InitializeEmpty(); nsCSSParser cssParser(env.mCSSLoader); bool changed; nsresult result = cssParser.ParseDeclarations(aCssText, env.mSheetURI, env.mBaseURI, env.mPrincipal, decl, &changed); if (NS_FAILED(result) || !changed) { return result; } newdecl = decl.forget(); } return SetCSSDeclaration(newdecl); } NS_IMETHODIMP nsDOMCSSDeclaration::GetLength(uint32_t* aLength) { DeclarationBlock* decl = GetCSSDeclaration(eOperation_Read); if (decl) { *aLength = decl->Count(); } else { *aLength = 0; } return NS_OK; } already_AddRefed<dom::CSSValue> nsDOMCSSDeclaration::GetPropertyCSSValue(const nsAString& aPropertyName, ErrorResult& aRv) { // We don't support CSSValue yet so we'll just return null... return nullptr; } void nsDOMCSSDeclaration::IndexedGetter(uint32_t aIndex, bool& aFound, nsAString& aPropName) { DeclarationBlock* decl = GetCSSDeclaration(eOperation_Read); aFound = decl && decl->GetNthProperty(aIndex, aPropName); } NS_IMETHODIMP nsDOMCSSDeclaration::GetPropertyValue(const nsAString& aPropertyName, nsAString& aReturn) { aReturn.Truncate(); if (DeclarationBlock* decl = GetCSSDeclaration(eOperation_Read)) { decl->GetPropertyValue(aPropertyName, aReturn); } return NS_OK; } NS_IMETHODIMP nsDOMCSSDeclaration::GetAuthoredPropertyValue(const nsAString& aPropertyName, nsAString& aReturn) { if (DeclarationBlock* decl = GetCSSDeclaration(eOperation_Read)) { decl->GetAuthoredPropertyValue(aPropertyName, aReturn); } return NS_OK; } NS_IMETHODIMP nsDOMCSSDeclaration::GetPropertyPriority(const nsAString& aPropertyName, nsAString& aReturn) { DeclarationBlock* decl = GetCSSDeclaration(eOperation_Read); aReturn.Truncate(); if (decl && decl->GetPropertyIsImportant(aPropertyName)) { aReturn.AssignLiteral("important"); } return NS_OK; } NS_IMETHODIMP nsDOMCSSDeclaration::SetProperty(const nsAString& aPropertyName, const nsAString& aValue, const nsAString& aPriority) { 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); } // In the common (and fast) cases we can use the property id nsCSSPropertyID propID = nsCSSProps::LookupProperty(aPropertyName, CSSEnabledState::eForAllContent); if (propID == eCSSProperty_UNKNOWN) { return NS_OK; } bool important; if (aPriority.IsEmpty()) { important = false; } else if (aPriority.EqualsLiteral("important")) { important = true; } else { // XXX silent failure? return NS_OK; } if (propID == eCSSPropertyExtra_variable) { return ParseCustomPropertyValue(aPropertyName, aValue, important); } return ParsePropertyValue(propID, aValue, important); } NS_IMETHODIMP nsDOMCSSDeclaration::RemoveProperty(const nsAString& aPropertyName, nsAString& aReturn) { nsresult rv = GetPropertyValue(aPropertyName, aReturn); NS_ENSURE_SUCCESS(rv, rv); return RemovePropertyInternal(aPropertyName); } /* static */ void nsDOMCSSDeclaration::GetCSSParsingEnvironmentForRule(css::Rule* aRule, CSSParsingEnvironment& aCSSParseEnv) { CSSStyleSheet* sheet = aRule ? aRule->GetStyleSheet() : nullptr; if (!sheet) { aCSSParseEnv.mPrincipal = nullptr; return; } nsIDocument* document = sheet->GetOwningDocument(); aCSSParseEnv.mSheetURI = sheet->GetSheetURI(); aCSSParseEnv.mBaseURI = sheet->GetBaseURI(); aCSSParseEnv.mPrincipal = sheet->Principal(); aCSSParseEnv.mCSSLoader = document ? document->CSSLoader() : nullptr; } nsresult nsDOMCSSDeclaration::ParsePropertyValue(const nsCSSPropertyID aPropID, const nsAString& aPropValue, bool aIsImportant) { DeclarationBlock* olddecl = GetCSSDeclaration(eOperation_Modify); if (!olddecl) { return NS_ERROR_NOT_AVAILABLE; } CSSParsingEnvironment env; GetCSSParsingEnvironment(env); if (!env.mPrincipal) { 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). mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true); RefPtr<DeclarationBlock> decl = olddecl->EnsureMutable(); bool changed; if (decl->IsGecko()) { nsCSSParser cssParser(env.mCSSLoader); cssParser.ParseProperty(aPropID, aPropValue, env.mSheetURI, env.mBaseURI, env.mPrincipal, decl->AsGecko(), &changed, aIsImportant); } else { nsIAtom* atom = nsCSSProps::AtomForProperty(aPropID); NS_ConvertUTF16toUTF8 value(aPropValue); changed = Servo_DeclarationBlock_SetProperty( decl->AsServo()->Raw(), atom, false, &value, aIsImportant); } if (!changed) { // Parsing failed -- but we don't throw an exception for that. return NS_OK; } return SetCSSDeclaration(decl); } nsresult nsDOMCSSDeclaration::ParseCustomPropertyValue(const nsAString& aPropertyName, const nsAString& aPropValue, bool aIsImportant) { MOZ_ASSERT(nsCSSProps::IsCustomPropertyName(aPropertyName)); DeclarationBlock* olddecl = GetCSSDeclaration(eOperation_Modify); if (!olddecl) { return NS_ERROR_NOT_AVAILABLE; } CSSParsingEnvironment env; GetCSSParsingEnvironment(env); if (!env.mPrincipal) { 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). mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true); RefPtr<DeclarationBlock> decl = olddecl->EnsureMutable(); bool changed; auto propName = Substring(aPropertyName, CSS_CUSTOM_NAME_PREFIX_LENGTH); if (decl->IsGecko()) { nsCSSParser cssParser(env.mCSSLoader); cssParser.ParseVariable(propName, aPropValue, env.mSheetURI, env.mBaseURI, env.mPrincipal, decl->AsGecko(), &changed, aIsImportant); } else { RefPtr<nsIAtom> atom = NS_Atomize(propName); NS_ConvertUTF16toUTF8 value(aPropValue); changed = Servo_DeclarationBlock_SetProperty( decl->AsServo()->Raw(), atom, true, &value, aIsImportant); } if (!changed) { // Parsing failed -- but we don't throw an exception for that. return NS_OK; } return SetCSSDeclaration(decl); } nsresult nsDOMCSSDeclaration::RemovePropertyInternal(nsCSSPropertyID aPropID) { DeclarationBlock* olddecl = GetCSSDeclaration(eOperation_RemoveProperty); if (!olddecl) { return NS_OK; // 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). mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true); RefPtr<DeclarationBlock> decl = olddecl->EnsureMutable(); decl->RemovePropertyByID(aPropID); return SetCSSDeclaration(decl); } nsresult nsDOMCSSDeclaration::RemovePropertyInternal(const nsAString& aPropertyName) { DeclarationBlock* olddecl = GetCSSDeclaration(eOperation_RemoveProperty); if (!olddecl) { return NS_OK; // 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). mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true); RefPtr<DeclarationBlock> decl = olddecl->EnsureMutable(); decl->RemoveProperty(aPropertyName); return SetCSSDeclaration(decl); }