michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /* base class for DOM objects for element.style and cssStyleRule.style */
michael@0: 
michael@0: #include "nsDOMCSSDeclaration.h"
michael@0: 
michael@0: #include "nsCSSParser.h"
michael@0: #include "nsCSSStyleSheet.h"
michael@0: #include "mozilla/css/Rule.h"
michael@0: #include "mozilla/css/Declaration.h"
michael@0: #include "mozilla/dom/CSS2PropertiesBinding.h"
michael@0: #include "nsCSSProps.h"
michael@0: #include "nsCOMPtr.h"
michael@0: #include "mozAutoDocUpdate.h"
michael@0: #include "nsIURI.h"
michael@0: #include "mozilla/dom/BindingUtils.h"
michael@0: #include "nsContentUtils.h"
michael@0: 
michael@0: using namespace mozilla;
michael@0: 
michael@0: nsDOMCSSDeclaration::~nsDOMCSSDeclaration()
michael@0: {
michael@0: }
michael@0: 
michael@0: /* virtual */ JSObject*
michael@0: nsDOMCSSDeclaration::WrapObject(JSContext* aCx)
michael@0: {
michael@0:   return dom::CSS2PropertiesBinding::Wrap(aCx, this);
michael@0: }
michael@0: 
michael@0: NS_INTERFACE_TABLE_HEAD(nsDOMCSSDeclaration)
michael@0:   NS_INTERFACE_TABLE(nsDOMCSSDeclaration,
michael@0:                      nsICSSDeclaration,
michael@0:                      nsIDOMCSSStyleDeclaration)
michael@0:   NS_INTERFACE_TABLE_TO_MAP_SEGUE
michael@0: NS_INTERFACE_MAP_END
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: nsDOMCSSDeclaration::GetPropertyValue(const nsCSSProperty aPropID,
michael@0:                                       nsAString& aValue)
michael@0: {
michael@0:   NS_PRECONDITION(aPropID != eCSSProperty_UNKNOWN,
michael@0:                   "Should never pass eCSSProperty_UNKNOWN around");
michael@0: 
michael@0:   css::Declaration* decl = GetCSSDeclaration(false);
michael@0: 
michael@0:   aValue.Truncate();
michael@0:   if (decl) {
michael@0:     decl->GetValue(aPropID, aValue);
michael@0:   }
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: void
michael@0: nsDOMCSSDeclaration::GetCustomPropertyValue(const nsAString& aPropertyName,
michael@0:                                             nsAString& aValue)
michael@0: {
michael@0:   MOZ_ASSERT(Substring(aPropertyName, 0,
michael@0:                        CSS_CUSTOM_NAME_PREFIX_LENGTH).EqualsLiteral("--"));
michael@0: 
michael@0:   css::Declaration* decl = GetCSSDeclaration(false);
michael@0:   if (!decl) {
michael@0:     aValue.Truncate();
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   decl->GetVariableDeclaration(Substring(aPropertyName,
michael@0:                                          CSS_CUSTOM_NAME_PREFIX_LENGTH),
michael@0:                                aValue);
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: nsDOMCSSDeclaration::SetPropertyValue(const nsCSSProperty aPropID,
michael@0:                                       const nsAString& aValue)
michael@0: {
michael@0:   if (aValue.IsEmpty()) {
michael@0:     // If the new value of the property is an empty string we remove the
michael@0:     // property.
michael@0:     return RemoveProperty(aPropID);
michael@0:   }
michael@0: 
michael@0:   return ParsePropertyValue(aPropID, aValue, false);
michael@0: }
michael@0: 
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: nsDOMCSSDeclaration::GetCssText(nsAString& aCssText)
michael@0: {
michael@0:   css::Declaration* decl = GetCSSDeclaration(false);
michael@0:   aCssText.Truncate();
michael@0: 
michael@0:   if (decl) {
michael@0:     decl->ToString(aCssText);
michael@0:   }
michael@0: 
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: nsDOMCSSDeclaration::SetCssText(const nsAString& aCssText)
michael@0: {
michael@0:   // We don't need to *do* anything with the old declaration, but we need
michael@0:   // to ensure that it exists, or else SetCSSDeclaration may crash.
michael@0:   css::Declaration* olddecl = GetCSSDeclaration(true);
michael@0:   if (!olddecl) {
michael@0:     return NS_ERROR_FAILURE;
michael@0:   }
michael@0: 
michael@0:   CSSParsingEnvironment env;
michael@0:   GetCSSParsingEnvironment(env);
michael@0:   if (!env.mPrincipal) {
michael@0:     return NS_ERROR_NOT_AVAILABLE;
michael@0:   }
michael@0: 
michael@0:   // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
michael@0:   // Attribute setting code, which leads in turn to BeginUpdate.  We
michael@0:   // need to start the update now so that the old rule doesn't get used
michael@0:   // between when we mutate the declaration and when we set the new
michael@0:   // rule (see stack in bug 209575).
michael@0:   mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
michael@0: 
michael@0:   nsAutoPtr<css::Declaration> decl(new css::Declaration());
michael@0:   decl->InitializeEmpty();
michael@0:   nsCSSParser cssParser(env.mCSSLoader);
michael@0:   bool changed;
michael@0:   nsresult result = cssParser.ParseDeclarations(aCssText, env.mSheetURI,
michael@0:                                                 env.mBaseURI,
michael@0:                                                 env.mPrincipal, decl, &changed);
michael@0:   if (NS_FAILED(result) || !changed) {
michael@0:     return result;
michael@0:   }
michael@0: 
michael@0:   return SetCSSDeclaration(decl.forget());
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: nsDOMCSSDeclaration::GetLength(uint32_t* aLength)
michael@0: {
michael@0:   css::Declaration* decl = GetCSSDeclaration(false);
michael@0: 
michael@0:   if (decl) {
michael@0:     *aLength = decl->Count();
michael@0:   } else {
michael@0:     *aLength = 0;
michael@0:   }
michael@0: 
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: already_AddRefed<dom::CSSValue>
michael@0: nsDOMCSSDeclaration::GetPropertyCSSValue(const nsAString& aPropertyName, ErrorResult& aRv)
michael@0: {
michael@0:   // We don't support CSSValue yet so we'll just return null...
michael@0: 
michael@0:   return nullptr;
michael@0: }
michael@0: 
michael@0: void
michael@0: nsDOMCSSDeclaration::IndexedGetter(uint32_t aIndex, bool& aFound, nsAString& aPropName)
michael@0: {
michael@0:   css::Declaration* decl = GetCSSDeclaration(false);
michael@0:   aFound = decl && decl->GetNthProperty(aIndex, aPropName);
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: nsDOMCSSDeclaration::GetPropertyValue(const nsAString& aPropertyName,
michael@0:                                       nsAString& aReturn)
michael@0: {
michael@0:   const nsCSSProperty propID =
michael@0:     nsCSSProps::LookupProperty(aPropertyName,
michael@0:                                nsCSSProps::eEnabledForAllContent);
michael@0:   if (propID == eCSSProperty_UNKNOWN) {
michael@0:     aReturn.Truncate();
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   if (propID == eCSSPropertyExtra_variable) {
michael@0:     GetCustomPropertyValue(aPropertyName, aReturn);
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   return GetPropertyValue(propID, aReturn);
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: nsDOMCSSDeclaration::GetAuthoredPropertyValue(const nsAString& aPropertyName,
michael@0:                                               nsAString& aReturn)
michael@0: {
michael@0:   const nsCSSProperty propID =
michael@0:     nsCSSProps::LookupProperty(aPropertyName,
michael@0:                                nsCSSProps::eEnabledForAllContent);
michael@0:   if (propID == eCSSProperty_UNKNOWN) {
michael@0:     aReturn.Truncate();
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   if (propID == eCSSPropertyExtra_variable) {
michael@0:     GetCustomPropertyValue(aPropertyName, aReturn);
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   css::Declaration* decl = GetCSSDeclaration(false);
michael@0:   if (!decl) {
michael@0:     return NS_ERROR_FAILURE;
michael@0:   }
michael@0: 
michael@0:   decl->GetAuthoredValue(propID, aReturn);
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: nsDOMCSSDeclaration::GetPropertyPriority(const nsAString& aPropertyName,
michael@0:                                          nsAString& aReturn)
michael@0: {
michael@0:   css::Declaration* decl = GetCSSDeclaration(false);
michael@0: 
michael@0:   aReturn.Truncate();
michael@0:   if (decl && decl->GetValueIsImportant(aPropertyName)) {
michael@0:     aReturn.AssignLiteral("important");
michael@0:   }
michael@0: 
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: nsDOMCSSDeclaration::SetProperty(const nsAString& aPropertyName,
michael@0:                                  const nsAString& aValue,
michael@0:                                  const nsAString& aPriority)
michael@0: {
michael@0:   // In the common (and fast) cases we can use the property id
michael@0:   nsCSSProperty propID =
michael@0:     nsCSSProps::LookupProperty(aPropertyName,
michael@0:                                nsCSSProps::eEnabledForAllContent);
michael@0:   if (propID == eCSSProperty_UNKNOWN) {
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   if (aValue.IsEmpty()) {
michael@0:     // If the new value of the property is an empty string we remove the
michael@0:     // property.
michael@0:     // XXX this ignores the priority string, should it?
michael@0:     if (propID == eCSSPropertyExtra_variable) {
michael@0:       return RemoveCustomProperty(aPropertyName);
michael@0:     }
michael@0:     return RemoveProperty(propID);
michael@0:   }
michael@0: 
michael@0:   bool important;
michael@0:   if (aPriority.IsEmpty()) {
michael@0:     important = false;
michael@0:   } else if (aPriority.EqualsLiteral("important")) {
michael@0:     important = true;
michael@0:   } else {
michael@0:     // XXX silent failure?
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   if (propID == eCSSPropertyExtra_variable) {
michael@0:     return ParseCustomPropertyValue(aPropertyName, aValue, important);
michael@0:   }
michael@0:   return ParsePropertyValue(propID, aValue, important);
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: nsDOMCSSDeclaration::RemoveProperty(const nsAString& aPropertyName,
michael@0:                                     nsAString& aReturn)
michael@0: {
michael@0:   const nsCSSProperty propID =
michael@0:     nsCSSProps::LookupProperty(aPropertyName,
michael@0:                                nsCSSProps::eEnabledForAllContent);
michael@0:   if (propID == eCSSProperty_UNKNOWN) {
michael@0:     aReturn.Truncate();
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   if (propID == eCSSPropertyExtra_variable) {
michael@0:     RemoveCustomProperty(aPropertyName);
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   nsresult rv = GetPropertyValue(propID, aReturn);
michael@0:   NS_ENSURE_SUCCESS(rv, rv);
michael@0: 
michael@0:   return RemoveProperty(propID);
michael@0: }
michael@0: 
michael@0: /* static */ void
michael@0: nsDOMCSSDeclaration::GetCSSParsingEnvironmentForRule(css::Rule* aRule,
michael@0:                                                      CSSParsingEnvironment& aCSSParseEnv)
michael@0: {
michael@0:   nsIStyleSheet* sheet = aRule ? aRule->GetStyleSheet() : nullptr;
michael@0:   nsRefPtr<nsCSSStyleSheet> cssSheet(do_QueryObject(sheet));
michael@0:   if (!cssSheet) {
michael@0:     aCSSParseEnv.mPrincipal = nullptr;
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   nsIDocument* document = sheet->GetOwningDocument();
michael@0:   aCSSParseEnv.mSheetURI = sheet->GetSheetURI();
michael@0:   aCSSParseEnv.mBaseURI = sheet->GetBaseURI();
michael@0:   aCSSParseEnv.mPrincipal = cssSheet->Principal();
michael@0:   aCSSParseEnv.mCSSLoader = document ? document->CSSLoader() : nullptr;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsDOMCSSDeclaration::ParsePropertyValue(const nsCSSProperty aPropID,
michael@0:                                         const nsAString& aPropValue,
michael@0:                                         bool aIsImportant)
michael@0: {
michael@0:   css::Declaration* olddecl = GetCSSDeclaration(true);
michael@0:   if (!olddecl) {
michael@0:     return NS_ERROR_FAILURE;
michael@0:   }
michael@0: 
michael@0:   CSSParsingEnvironment env;
michael@0:   GetCSSParsingEnvironment(env);
michael@0:   if (!env.mPrincipal) {
michael@0:     return NS_ERROR_NOT_AVAILABLE;
michael@0:   }
michael@0: 
michael@0:   // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
michael@0:   // Attribute setting code, which leads in turn to BeginUpdate.  We
michael@0:   // need to start the update now so that the old rule doesn't get used
michael@0:   // between when we mutate the declaration and when we set the new
michael@0:   // rule (see stack in bug 209575).
michael@0:   mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
michael@0:   css::Declaration* decl = olddecl->EnsureMutable();
michael@0: 
michael@0:   nsCSSParser cssParser(env.mCSSLoader);
michael@0:   bool changed;
michael@0:   nsresult result = cssParser.ParseProperty(aPropID, aPropValue, env.mSheetURI,
michael@0:                                             env.mBaseURI, env.mPrincipal, decl,
michael@0:                                             &changed, aIsImportant);
michael@0:   if (NS_FAILED(result) || !changed) {
michael@0:     if (decl != olddecl) {
michael@0:       delete decl;
michael@0:     }
michael@0:     return result;
michael@0:   }
michael@0: 
michael@0:   return SetCSSDeclaration(decl);
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsDOMCSSDeclaration::ParseCustomPropertyValue(const nsAString& aPropertyName,
michael@0:                                               const nsAString& aPropValue,
michael@0:                                               bool aIsImportant)
michael@0: {
michael@0:   MOZ_ASSERT(nsCSSProps::IsCustomPropertyName(aPropertyName));
michael@0: 
michael@0:   css::Declaration* olddecl = GetCSSDeclaration(true);
michael@0:   if (!olddecl) {
michael@0:     return NS_ERROR_FAILURE;
michael@0:   }
michael@0: 
michael@0:   CSSParsingEnvironment env;
michael@0:   GetCSSParsingEnvironment(env);
michael@0:   if (!env.mPrincipal) {
michael@0:     return NS_ERROR_NOT_AVAILABLE;
michael@0:   }
michael@0: 
michael@0:   // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
michael@0:   // Attribute setting code, which leads in turn to BeginUpdate.  We
michael@0:   // need to start the update now so that the old rule doesn't get used
michael@0:   // between when we mutate the declaration and when we set the new
michael@0:   // rule (see stack in bug 209575).
michael@0:   mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
michael@0:   css::Declaration* decl = olddecl->EnsureMutable();
michael@0: 
michael@0:   nsCSSParser cssParser(env.mCSSLoader);
michael@0:   bool changed;
michael@0:   nsresult result =
michael@0:     cssParser.ParseVariable(Substring(aPropertyName,
michael@0:                                       CSS_CUSTOM_NAME_PREFIX_LENGTH),
michael@0:                             aPropValue, env.mSheetURI,
michael@0:                             env.mBaseURI, env.mPrincipal, decl,
michael@0:                             &changed, aIsImportant);
michael@0:   if (NS_FAILED(result) || !changed) {
michael@0:     if (decl != olddecl) {
michael@0:       delete decl;
michael@0:     }
michael@0:     return result;
michael@0:   }
michael@0: 
michael@0:   return SetCSSDeclaration(decl);
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsDOMCSSDeclaration::RemoveProperty(const nsCSSProperty aPropID)
michael@0: {
michael@0:   css::Declaration* decl = GetCSSDeclaration(false);
michael@0:   if (!decl) {
michael@0:     return NS_OK; // no decl, so nothing to remove
michael@0:   }
michael@0: 
michael@0:   // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
michael@0:   // Attribute setting code, which leads in turn to BeginUpdate.  We
michael@0:   // need to start the update now so that the old rule doesn't get used
michael@0:   // between when we mutate the declaration and when we set the new
michael@0:   // rule (see stack in bug 209575).
michael@0:   mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
michael@0: 
michael@0:   decl = decl->EnsureMutable();
michael@0:   decl->RemoveProperty(aPropID);
michael@0:   return SetCSSDeclaration(decl);
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsDOMCSSDeclaration::RemoveCustomProperty(const nsAString& aPropertyName)
michael@0: {
michael@0:   MOZ_ASSERT(Substring(aPropertyName, 0,
michael@0:                        CSS_CUSTOM_NAME_PREFIX_LENGTH).EqualsLiteral("--"));
michael@0: 
michael@0:   css::Declaration* decl = GetCSSDeclaration(false);
michael@0:   if (!decl) {
michael@0:     return NS_OK; // no decl, so nothing to remove
michael@0:   }
michael@0: 
michael@0:   // For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
michael@0:   // Attribute setting code, which leads in turn to BeginUpdate.  We
michael@0:   // need to start the update now so that the old rule doesn't get used
michael@0:   // between when we mutate the declaration and when we set the new
michael@0:   // rule (see stack in bug 209575).
michael@0:   mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
michael@0: 
michael@0:   decl = decl->EnsureMutable();
michael@0:   decl->RemoveVariableDeclaration(Substring(aPropertyName,
michael@0:                                             CSS_CUSTOM_NAME_PREFIX_LENGTH));
michael@0:   return SetCSSDeclaration(decl);
michael@0: }
michael@0: 
michael@0: bool IsCSSPropertyExposedToJS(nsCSSProperty aProperty, JSContext* cx, JSObject* obj)
michael@0: {
michael@0:   nsCSSProps::EnabledState enabledState = nsCSSProps::eEnabledForAllContent;
michael@0: 
michael@0:   // Optimization: we skip checking properties of the JSContext
michael@0:   // in the majority case where the property does not have the
michael@0:   // CSS_PROPERTY_ALWAYS_ENABLED_IN_PRIVILEGED_CONTENT flag.
michael@0:   bool isEnabledInChromeOrCertifiedApp
michael@0:     = nsCSSProps::PropHasFlags(aProperty,
michael@0:                                CSS_PROPERTY_ALWAYS_ENABLED_IN_CHROME_OR_CERTIFIED_APP);
michael@0: 
michael@0:   if (isEnabledInChromeOrCertifiedApp) {
michael@0:     if (dom::IsInCertifiedApp(cx, obj) ||
michael@0:         nsContentUtils::ThreadsafeIsCallerChrome())
michael@0:     {
michael@0:       enabledState |= nsCSSProps::eEnabledInChromeOrCertifiedApp;
michael@0:     }
michael@0:   }
michael@0:   return nsCSSProps::IsEnabled(aProperty, enabledState);
michael@0: }