import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/base/nsNameSpaceManager.cpp

@@ -0,0 +1,266 @@
+/* -*- 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 "nsCOMArray.h"
+#include "nsContentCreatorFunctions.h"
+#include "nsContentUtils.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* kPrefMathMLDisabled = "mathml.disabled";
+static const char* kObservedPrefs[] = {
+  kPrefMathMLDisabled,
+  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);
+
+
+  // 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);
+
+#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;
+  }
+
+  nsCOMPtr<nsIAtom> 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;
+    }
+  }
+
+  NS_POSTCONDITION(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
+  }
+
+  nsCOMPtr<nsIAtom> atom = NS_Atomize(aURI);
+  return GetNameSpaceID(atom, aInChromeDoc);
+}
+
+int32_t
+nsNameSpaceManager::GetNameSpaceID(nsIAtom* aURI,
+                                   bool aInChromeDoc)
+{
+  if (aURI == nsGkAtoms::_empty) {
+    return kNameSpaceID_None; // xmlns="", see bug 75700 for details
+  }
+
+  int32_t nameSpaceID;
+  if (mMathMLDisabled &&
+      mDisabledURIToIDTable.Get(aURI, &nameSpaceID) &&
+      !aInChromeDoc) {
+    NS_POSTCONDITION(nameSpaceID >= 0, "Bogus namespace ID");
+    return nameSpaceID;
+  }
+  if (mURIToIDTable.Get(aURI, &nameSpaceID)) {
+    NS_POSTCONDITION(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) {
+    return NS_NewHTMLElement(aResult, ni.forget(), aFromParser, aIs);
+  }
+#ifdef MOZ_XUL
+  if (ns == kNameSpaceID_XUL) {
+    return NS_NewXULElement(aResult, ni.forget());
+  }
+#endif
+  if (ns == kNameSpaceID_MathML) {
+    // If the mathml.disabled pref. is true, convert all MathML nodes into
+    // disabled MathML nodes by swapping the namespace.
+    nsNameSpaceManager* nsmgr = nsNameSpaceManager::GetInstance();
+    if ((nsmgr && !nsmgr->mMathMLDisabled) ||
+        nsContentUtils::IsChromeDoc(ni->GetDocument())) {
+      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) {
+    return NS_NewSVGElement(aResult, ni.forget(), aFromParser);
+  }
+  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<nsIAtom> aURI,
+                                          const int32_t aNameSpaceID)
+{
+  nsCOMPtr<nsIAtom> 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<nsIAtom> aURI,
+                                         const int32_t aNameSpaceID)
+{
+  nsCOMPtr<nsIAtom> 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);
+  return NS_OK;
+}