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