The Tor Browser: layout/style/nsDOMCSSDeclaration.cpp@7e26c7da4463 (annotated)

layout/style/nsDOMCSSDeclaration.cpp@7e26c7da4463 (annotated)

layout/style/nsDOMCSSDeclaration.cpp

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /* -*- 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 "nsCSSStyleSheet.h"
 #include "mozilla/css/Rule.h"
 #include "mozilla/css/Declaration.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"
 using namespace mozilla;
 nsDOMCSSDeclaration::~nsDOMCSSDeclaration()
 {
 }
 /* virtual */ JSObject*
 nsDOMCSSDeclaration::WrapObject(JSContext* aCx)
 {
   return dom::CSS2PropertiesBinding::Wrap(aCx, this);
 }
 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 nsCSSProperty aPropID,
                                       nsAString& aValue)
 {
   NS_PRECONDITION(aPropID != eCSSProperty_UNKNOWN,
                   "Should never pass eCSSProperty_UNKNOWN around");
   css::Declaration* decl = GetCSSDeclaration(false);
   aValue.Truncate();
   if (decl) {
     decl->GetValue(aPropID, aValue);
   }
   return NS_OK;
 }
 void
 nsDOMCSSDeclaration::GetCustomPropertyValue(const nsAString& aPropertyName,
                                             nsAString& aValue)
 {
   MOZ_ASSERT(Substring(aPropertyName, 0,
                        CSS_CUSTOM_NAME_PREFIX_LENGTH).EqualsLiteral("--"));
   css::Declaration* decl = GetCSSDeclaration(false);
   if (!decl) {
     aValue.Truncate();
     return;
   }
   decl->GetVariableDeclaration(Substring(aPropertyName,
                                          CSS_CUSTOM_NAME_PREFIX_LENGTH),
                                aValue);
 }
 NS_IMETHODIMP
 nsDOMCSSDeclaration::SetPropertyValue(const nsCSSProperty aPropID,
                                       const nsAString& aValue)
 {
   if (aValue.IsEmpty()) {
     // If the new value of the property is an empty string we remove the
     // property.
     return RemoveProperty(aPropID);
   }
   return ParsePropertyValue(aPropID, aValue, false);
 }
 NS_IMETHODIMP
 nsDOMCSSDeclaration::GetCssText(nsAString& aCssText)
 {
   css::Declaration* decl = GetCSSDeclaration(false);
   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.
   css::Declaration* olddecl = GetCSSDeclaration(true);
   if (!olddecl) {
     return NS_ERROR_FAILURE;
   }
   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);
   nsAutoPtr<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;
   }
   return SetCSSDeclaration(decl.forget());
 }
 NS_IMETHODIMP
 nsDOMCSSDeclaration::GetLength(uint32_t* aLength)
 {
   css::Declaration* decl = GetCSSDeclaration(false);
   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)
 {
   css::Declaration* decl = GetCSSDeclaration(false);
   aFound = decl && decl->GetNthProperty(aIndex, aPropName);
 }
 NS_IMETHODIMP
 nsDOMCSSDeclaration::GetPropertyValue(const nsAString& aPropertyName,
                                       nsAString& aReturn)
 {
   const nsCSSProperty propID =
     nsCSSProps::LookupProperty(aPropertyName,
                                nsCSSProps::eEnabledForAllContent);
   if (propID == eCSSProperty_UNKNOWN) {
     aReturn.Truncate();
     return NS_OK;
   }
   if (propID == eCSSPropertyExtra_variable) {
     GetCustomPropertyValue(aPropertyName, aReturn);
     return NS_OK;
   }
   return GetPropertyValue(propID, aReturn);
 }
 NS_IMETHODIMP
 nsDOMCSSDeclaration::GetAuthoredPropertyValue(const nsAString& aPropertyName,
                                               nsAString& aReturn)
 {
   const nsCSSProperty propID =
     nsCSSProps::LookupProperty(aPropertyName,
                                nsCSSProps::eEnabledForAllContent);
   if (propID == eCSSProperty_UNKNOWN) {
     aReturn.Truncate();
     return NS_OK;
   }
   if (propID == eCSSPropertyExtra_variable) {
     GetCustomPropertyValue(aPropertyName, aReturn);
     return NS_OK;
   }
   css::Declaration* decl = GetCSSDeclaration(false);
   if (!decl) {
     return NS_ERROR_FAILURE;
   }
   decl->GetAuthoredValue(propID, aReturn);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMCSSDeclaration::GetPropertyPriority(const nsAString& aPropertyName,
                                          nsAString& aReturn)
 {
   css::Declaration* decl = GetCSSDeclaration(false);
   aReturn.Truncate();
   if (decl && decl->GetValueIsImportant(aPropertyName)) {
     aReturn.AssignLiteral("important");
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsDOMCSSDeclaration::SetProperty(const nsAString& aPropertyName,
                                  const nsAString& aValue,
                                  const nsAString& aPriority)
 {
   // In the common (and fast) cases we can use the property id
   nsCSSProperty propID =
     nsCSSProps::LookupProperty(aPropertyName,
                                nsCSSProps::eEnabledForAllContent);
   if (propID == eCSSProperty_UNKNOWN) {
     return NS_OK;
   }
   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?
     if (propID == eCSSPropertyExtra_variable) {
       return RemoveCustomProperty(aPropertyName);
     }
     return RemoveProperty(propID);
   }
   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)
 {
   const nsCSSProperty propID =
     nsCSSProps::LookupProperty(aPropertyName,
                                nsCSSProps::eEnabledForAllContent);
   if (propID == eCSSProperty_UNKNOWN) {
     aReturn.Truncate();
     return NS_OK;
   }
   if (propID == eCSSPropertyExtra_variable) {
     RemoveCustomProperty(aPropertyName);
     return NS_OK;
   }
   nsresult rv = GetPropertyValue(propID, aReturn);
   NS_ENSURE_SUCCESS(rv, rv);
   return RemoveProperty(propID);
 }
 /* static */ void
 nsDOMCSSDeclaration::GetCSSParsingEnvironmentForRule(css::Rule* aRule,
                                                      CSSParsingEnvironment& aCSSParseEnv)
 {
   nsIStyleSheet* sheet = aRule ? aRule->GetStyleSheet() : nullptr;
   nsRefPtr<nsCSSStyleSheet> cssSheet(do_QueryObject(sheet));
   if (!cssSheet) {
     aCSSParseEnv.mPrincipal = nullptr;
     return;
   }
   nsIDocument* document = sheet->GetOwningDocument();
   aCSSParseEnv.mSheetURI = sheet->GetSheetURI();
   aCSSParseEnv.mBaseURI = sheet->GetBaseURI();
   aCSSParseEnv.mPrincipal = cssSheet->Principal();
   aCSSParseEnv.mCSSLoader = document ? document->CSSLoader() : nullptr;
 }
 nsresult
 nsDOMCSSDeclaration::ParsePropertyValue(const nsCSSProperty aPropID,
                                         const nsAString& aPropValue,
                                         bool aIsImportant)
 {
   css::Declaration* olddecl = GetCSSDeclaration(true);
   if (!olddecl) {
     return NS_ERROR_FAILURE;
   }
   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);
   css::Declaration* decl = olddecl->EnsureMutable();
   nsCSSParser cssParser(env.mCSSLoader);
   bool changed;
   nsresult result = cssParser.ParseProperty(aPropID, aPropValue, env.mSheetURI,
                                             env.mBaseURI, env.mPrincipal, decl,
                                             &changed, aIsImportant);
   if (NS_FAILED(result) || !changed) {
     if (decl != olddecl) {
       delete decl;
     }
     return result;
   }
   return SetCSSDeclaration(decl);
 }
 nsresult
 nsDOMCSSDeclaration::ParseCustomPropertyValue(const nsAString& aPropertyName,
                                               const nsAString& aPropValue,
                                               bool aIsImportant)
 {
   MOZ_ASSERT(nsCSSProps::IsCustomPropertyName(aPropertyName));
   css::Declaration* olddecl = GetCSSDeclaration(true);
   if (!olddecl) {
     return NS_ERROR_FAILURE;
   }
   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);
   css::Declaration* decl = olddecl->EnsureMutable();
   nsCSSParser cssParser(env.mCSSLoader);
   bool changed;
   nsresult result =
     cssParser.ParseVariable(Substring(aPropertyName,
                                       CSS_CUSTOM_NAME_PREFIX_LENGTH),
                             aPropValue, env.mSheetURI,
                             env.mBaseURI, env.mPrincipal, decl,
                             &changed, aIsImportant);
   if (NS_FAILED(result) || !changed) {
     if (decl != olddecl) {
       delete decl;
     }
     return result;
   }
   return SetCSSDeclaration(decl);
 }
 nsresult
 nsDOMCSSDeclaration::RemoveProperty(const nsCSSProperty aPropID)
 {
   css::Declaration* decl = GetCSSDeclaration(false);
   if (!decl) {
     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);
   decl = decl->EnsureMutable();
   decl->RemoveProperty(aPropID);
   return SetCSSDeclaration(decl);
 }
 nsresult
 nsDOMCSSDeclaration::RemoveCustomProperty(const nsAString& aPropertyName)
 {
   MOZ_ASSERT(Substring(aPropertyName, 0,
                        CSS_CUSTOM_NAME_PREFIX_LENGTH).EqualsLiteral("--"));
   css::Declaration* decl = GetCSSDeclaration(false);
   if (!decl) {
     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);
   decl = decl->EnsureMutable();
   decl->RemoveVariableDeclaration(Substring(aPropertyName,
                                             CSS_CUSTOM_NAME_PREFIX_LENGTH));
   return SetCSSDeclaration(decl);
 }
 bool IsCSSPropertyExposedToJS(nsCSSProperty aProperty, JSContext* cx, JSObject* obj)
 {
   nsCSSProps::EnabledState enabledState = nsCSSProps::eEnabledForAllContent;
   // Optimization: we skip checking properties of the JSContext
   // in the majority case where the property does not have the
   // CSS_PROPERTY_ALWAYS_ENABLED_IN_PRIVILEGED_CONTENT flag.
   bool isEnabledInChromeOrCertifiedApp
     = nsCSSProps::PropHasFlags(aProperty,
                                CSS_PROPERTY_ALWAYS_ENABLED_IN_CHROME_OR_CERTIFIED_APP);
   if (isEnabledInChromeOrCertifiedApp) {
     if (dom::IsInCertifiedApp(cx, obj) ||
         nsContentUtils::ThreadsafeIsCallerChrome())
     {
       enabledState |= nsCSSProps::eEnabledInChromeOrCertifiedApp;
     }
   }
   return nsCSSProps::IsEnabled(aProperty, enabledState);
 }

The Tor Browser / annotate

layout/style/nsDOMCSSDeclaration.cpp@7e26c7da4463 (annotated)

layout/style/nsDOMCSSDeclaration.cpp