gecko-dev/dom/base/nsNameSpaceManager.cpp

282 строки
8.5 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
/*
* A class for managing namespace IDs and mapping back and forth
* between namespace IDs and namespace URIs.
*/
#include "nsNameSpaceManager.h"
#include "nscore.h"
#include "mozilla/dom/NodeInfo.h"
#include "nsAtom.h"
#include "nsCOMArray.h"
#include "nsContentCreatorFunctions.h"
#include "nsGkAtoms.h"
#include "nsIDocument.h"
#include "nsString.h"
#include "mozilla/dom/NodeInfo.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/dom/XBLChildrenElement.h"
#include "mozilla/dom/Element.h"
#include "mozilla/Preferences.h"
using namespace mozilla;
using namespace mozilla::dom;
static const char* kPrefSVGDisabled = "svg.disabled";
static const char* kPrefMathMLDisabled = "mathml.disabled";
static const char* kObservedPrefs[] = {
kPrefMathMLDisabled,
kPrefSVGDisabled,
nullptr
};
StaticRefPtr<nsNameSpaceManager> nsNameSpaceManager::sInstance;
/* static */ nsNameSpaceManager*
nsNameSpaceManager::GetInstance() {
if (!sInstance) {
sInstance = new nsNameSpaceManager();
if (sInstance->Init()) {
ClearOnShutdown(&sInstance);
} else {
delete sInstance;
sInstance = nullptr;
}
}
return sInstance;
}
bool nsNameSpaceManager::Init()
{
nsresult rv;
#define REGISTER_NAMESPACE(uri, id) \
rv = AddNameSpace(dont_AddRef(uri), id); \
NS_ENSURE_SUCCESS(rv, false)
#define REGISTER_DISABLED_NAMESPACE(uri, id) \
rv = AddDisabledNameSpace(dont_AddRef(uri), id); \
NS_ENSURE_SUCCESS(rv, false)
mozilla::Preferences::AddStrongObservers(this, kObservedPrefs);
mMathMLDisabled = mozilla::Preferences::GetBool(kPrefMathMLDisabled);
mSVGDisabled = mozilla::Preferences::GetBool(kPrefSVGDisabled);
// Need to be ordered according to ID.
MOZ_ASSERT(mURIArray.IsEmpty());
REGISTER_NAMESPACE(nsGkAtoms::_empty, kNameSpaceID_None);
REGISTER_NAMESPACE(nsGkAtoms::nsuri_xmlns, kNameSpaceID_XMLNS);
REGISTER_NAMESPACE(nsGkAtoms::nsuri_xml, kNameSpaceID_XML);
REGISTER_NAMESPACE(nsGkAtoms::nsuri_xhtml, kNameSpaceID_XHTML);
REGISTER_NAMESPACE(nsGkAtoms::nsuri_xlink, kNameSpaceID_XLink);
REGISTER_NAMESPACE(nsGkAtoms::nsuri_xslt, kNameSpaceID_XSLT);
REGISTER_NAMESPACE(nsGkAtoms::nsuri_xbl, kNameSpaceID_XBL);
REGISTER_NAMESPACE(nsGkAtoms::nsuri_mathml, kNameSpaceID_MathML);
REGISTER_NAMESPACE(nsGkAtoms::nsuri_rdf, kNameSpaceID_RDF);
REGISTER_NAMESPACE(nsGkAtoms::nsuri_xul, kNameSpaceID_XUL);
REGISTER_NAMESPACE(nsGkAtoms::nsuri_svg, kNameSpaceID_SVG);
REGISTER_DISABLED_NAMESPACE(nsGkAtoms::nsuri_mathml, kNameSpaceID_disabled_MathML);
REGISTER_DISABLED_NAMESPACE(nsGkAtoms::nsuri_svg, kNameSpaceID_disabled_SVG);
#undef REGISTER_NAMESPACE
#undef REGISTER_DISABLED_NAMESPACE
return true;
}
nsresult
nsNameSpaceManager::RegisterNameSpace(const nsAString& aURI,
int32_t& aNameSpaceID)
{
if (aURI.IsEmpty()) {
aNameSpaceID = kNameSpaceID_None; // xmlns="", see bug 75700 for details
return NS_OK;
}
RefPtr<nsAtom> atom = NS_Atomize(aURI);
nsresult rv = NS_OK;
if (!mURIToIDTable.Get(atom, &aNameSpaceID)) {
aNameSpaceID = mURIArray.Length();
rv = AddNameSpace(atom.forget(), aNameSpaceID);
if (NS_FAILED(rv)) {
aNameSpaceID = kNameSpaceID_Unknown;
}
}
MOZ_ASSERT(aNameSpaceID >= -1, "Bogus namespace ID");
return rv;
}
nsresult
nsNameSpaceManager::GetNameSpaceURI(int32_t aNameSpaceID, nsAString& aURI)
{
NS_PRECONDITION(aNameSpaceID >= 0, "Bogus namespace ID");
// We have historically treated GetNameSpaceURI calls for kNameSpaceID_None
// as erroneous.
if (aNameSpaceID <= 0 || aNameSpaceID >= int32_t(mURIArray.Length())) {
aURI.Truncate();
return NS_ERROR_ILLEGAL_VALUE;
}
mURIArray.ElementAt(aNameSpaceID)->ToString(aURI);
return NS_OK;
}
int32_t
nsNameSpaceManager::GetNameSpaceID(const nsAString& aURI,
bool aInChromeDoc)
{
if (aURI.IsEmpty()) {
return kNameSpaceID_None; // xmlns="", see bug 75700 for details
}
RefPtr<nsAtom> atom = NS_Atomize(aURI);
return GetNameSpaceID(atom, aInChromeDoc);
}
int32_t
nsNameSpaceManager::GetNameSpaceID(nsAtom* aURI,
bool aInChromeDoc)
{
if (aURI == nsGkAtoms::_empty) {
return kNameSpaceID_None; // xmlns="", see bug 75700 for details
}
int32_t nameSpaceID;
if (!aInChromeDoc
&& (mMathMLDisabled || mSVGDisabled)
&& mDisabledURIToIDTable.Get(aURI, &nameSpaceID)
&& ((mMathMLDisabled && kNameSpaceID_disabled_MathML == nameSpaceID) ||
(mSVGDisabled && kNameSpaceID_disabled_SVG == nameSpaceID))) {
MOZ_ASSERT(nameSpaceID >= 0, "Bogus namespace ID");
return nameSpaceID;
}
if (mURIToIDTable.Get(aURI, &nameSpaceID)) {
MOZ_ASSERT(nameSpaceID >= 0, "Bogus namespace ID");
return nameSpaceID;
}
return kNameSpaceID_Unknown;
}
nsresult
NS_NewElement(Element** aResult,
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
FromParser aFromParser,
const nsAString* aIs)
{
RefPtr<mozilla::dom::NodeInfo> ni = aNodeInfo;
int32_t ns = ni->NamespaceID();
if (ns == kNameSpaceID_XHTML) {
RefPtr<nsAtom> isAtom = aIs ? NS_Atomize(*aIs) : nullptr;
return NS_NewHTMLElement(aResult, ni.forget(), aFromParser, isAtom);
}
#ifdef MOZ_XUL
if (ns == kNameSpaceID_XUL) {
return NS_NewXULElement(aResult, ni.forget(), aFromParser);
}
#endif
if (ns == kNameSpaceID_MathML) {
// If the mathml.disabled pref. is true, convert all MathML nodes into
// disabled MathML nodes by swapping the namespace.
if (ni->NodeInfoManager()->MathMLEnabled()) {
return NS_NewMathMLElement(aResult, ni.forget());
}
RefPtr<mozilla::dom::NodeInfo> genericXMLNI =
ni->NodeInfoManager()->
GetNodeInfo(ni->NameAtom(), ni->GetPrefixAtom(),
kNameSpaceID_disabled_MathML, ni->NodeType(), ni->GetExtraName());
return NS_NewXMLElement(aResult, genericXMLNI.forget());
}
if (ns == kNameSpaceID_SVG) {
// If the svg.disabled pref. is true, convert all SVG nodes into
// disabled SVG nodes by swapping the namespace.
if (ni->NodeInfoManager()->SVGEnabled()) {
return NS_NewSVGElement(aResult, ni.forget(), aFromParser);
}
RefPtr<mozilla::dom::NodeInfo> genericXMLNI =
ni->NodeInfoManager()->
GetNodeInfo(ni->NameAtom(), ni->GetPrefixAtom(),
kNameSpaceID_disabled_SVG, ni->NodeType(), ni->GetExtraName());
return NS_NewXMLElement(aResult, genericXMLNI.forget());
}
if (ns == kNameSpaceID_XBL && ni->Equals(nsGkAtoms::children)) {
NS_ADDREF(*aResult = new XBLChildrenElement(ni.forget()));
return NS_OK;
}
return NS_NewXMLElement(aResult, ni.forget());
}
bool
nsNameSpaceManager::HasElementCreator(int32_t aNameSpaceID)
{
return aNameSpaceID == kNameSpaceID_XHTML ||
#ifdef MOZ_XUL
aNameSpaceID == kNameSpaceID_XUL ||
#endif
aNameSpaceID == kNameSpaceID_MathML ||
aNameSpaceID == kNameSpaceID_SVG ||
false;
}
nsresult nsNameSpaceManager::AddNameSpace(already_AddRefed<nsAtom> aURI,
const int32_t aNameSpaceID)
{
RefPtr<nsAtom> uri = aURI;
if (aNameSpaceID < 0) {
// We've wrapped... Can't do anything else here; just bail.
return NS_ERROR_OUT_OF_MEMORY;
}
MOZ_ASSERT(aNameSpaceID == (int32_t) mURIArray.Length());
mURIArray.AppendElement(uri.forget());
mURIToIDTable.Put(mURIArray.LastElement(), aNameSpaceID);
return NS_OK;
}
nsresult
nsNameSpaceManager::AddDisabledNameSpace(already_AddRefed<nsAtom> aURI,
const int32_t aNameSpaceID)
{
RefPtr<nsAtom> uri = aURI;
if (aNameSpaceID < 0) {
// We've wrapped... Can't do anything else here; just bail.
return NS_ERROR_OUT_OF_MEMORY;
}
MOZ_ASSERT(aNameSpaceID == (int32_t) mURIArray.Length());
mURIArray.AppendElement(uri.forget());
mDisabledURIToIDTable.Put(mURIArray.LastElement(), aNameSpaceID);
return NS_OK;
}
// nsISupports
NS_IMPL_ISUPPORTS(nsNameSpaceManager,
nsIObserver)
// nsIObserver
NS_IMETHODIMP
nsNameSpaceManager::Observe(nsISupports* aObject, const char* aTopic,
const char16_t* aMessage)
{
mMathMLDisabled = mozilla::Preferences::GetBool(kPrefMathMLDisabled);
mSVGDisabled = mozilla::Preferences::GetBool(kPrefSVGDisabled);
return NS_OK;
}