gecko/layout/style/nsDOMCSSDeclaration.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2012-05-21 04:12:37 -07:00
/* 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 "nsIDOMCSSRule.h"
#include "nsCSSParser.h"
#include "mozilla/css/Loader.h"
#include "nsCSSStyleSheet.h"
#include "nsIStyleRule.h"
#include "mozilla/css/Rule.h"
#include "mozilla/css/Declaration.h"
#include "nsCSSProps.h"
#include "nsCOMPtr.h"
#include "nsIURL.h"
#include "nsReadableUtils.h"
#include "nsIPrincipal.h"
#include "mozAutoDocUpdate.h"
namespace css = mozilla::css;
nsDOMCSSDeclaration::~nsDOMCSSDeclaration()
{
}
NS_INTERFACE_TABLE_HEAD(nsDOMCSSDeclaration)
NS_INTERFACE_TABLE2(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;
}
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;
}
NS_IMETHODIMP
nsDOMCSSDeclaration::GetPropertyCSSValue(const nsAString& aPropertyName,
nsIDOMCSSValue** aReturn)
{
NS_ENSURE_ARG_POINTER(aReturn);
// We don't support CSSValue yet so we'll just return null...
*aReturn = nullptr;
return NS_OK;
}
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::eEnabled);
if (propID == eCSSProperty_UNKNOWN) {
aReturn.Truncate();
return NS_OK;
}
return GetPropertyValue(propID, aReturn);
}
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::eEnabled);
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?
return RemoveProperty(propID);
}
if (aPriority.IsEmpty()) {
return ParsePropertyValue(propID, aValue, false);
}
if (aPriority.EqualsLiteral("important")) {
return ParsePropertyValue(propID, aValue, true);
}
// XXX silent failure?
return NS_OK;
}
NS_IMETHODIMP
nsDOMCSSDeclaration::RemoveProperty(const nsAString& aPropertyName,
nsAString& aReturn)
{
const nsCSSProperty propID = nsCSSProps::LookupProperty(aPropertyName,
nsCSSProps::eEnabled);
if (propID == eCSSProperty_UNKNOWN) {
aReturn.Truncate();
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::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);
}