import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

2026-09-24 09:27:31 +09:00 · 2018-01-19 03:59:58 +08:00 · 2018-01-19 03:59:58 +08:00 · dcd9973243
commit dcd9973243
150858 changed files with 23884658 additions and 0 deletions
--- a/extensions/spellcheck/hunspell/glue/mozHunspell.cpp
+++ b/extensions/spellcheck/hunspell/glue/mozHunspell.cpp
@ -0,0 +1,623 @@
+/******* BEGIN LICENSE BLOCK *******
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Initial Developers of the Original Code are Kevin Hendricks (MySpell)
+ * and László Németh (Hunspell). Portions created by the Initial Developers
+ * are Copyright (C) 2002-2005 the Initial Developers. All Rights Reserved.
+ *
+ * Contributor(s): Kevin Hendricks (kevin.hendricks@sympatico.ca)
+ *                 David Einstein (deinst@world.std.com)
+ *                 Michiel van Leeuwen (mvl@exedo.nl)
+ *                 Caolan McNamara (cmc@openoffice.org)
+ *                 László Németh (nemethl@gyorsposta.hu)
+ *                 Davide Prina
+ *                 Giuseppe Modugno
+ *                 Gianluca Turconi
+ *                 Simon Brouwer
+ *                 Noll Janos
+ *                 Biro Arpad
+ *                 Goldman Eleonora
+ *                 Sarlos Tamas
+ *                 Bencsath Boldizsar
+ *                 Halacsy Peter
+ *                 Dvornik Laszlo
+ *                 Gefferth Andras
+ *                 Nagy Viktor
+ *                 Varga Daniel
+ *                 Chris Halls
+ *                 Rene Engelhard
+ *                 Bram Moolenaar
+ *                 Dafydd Jones
+ *                 Harri Pitkanen
+ *                 Andras Timar
+ *                 Tor Lillqvist
+ *                 Jesper Kristensen (mail@jesperkristensen.dk)
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ ******* END LICENSE BLOCK *******/
+
+#include "mozHunspell.h"
+#include "nsReadableUtils.h"
+#include "nsXPIDLString.h"
+#include "nsIObserverService.h"
+#include "nsISimpleEnumerator.h"
+#include "nsIDirectoryEnumerator.h"
+#include "nsIFile.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsDirectoryServiceDefs.h"
+#include "mozISpellI18NManager.h"
+#include "nsUnicharUtilCIID.h"
+#include "nsUnicharUtils.h"
+#include "nsCRT.h"
+#include "mozInlineSpellChecker.h"
+#include "mozilla/Services.h"
+#include <stdlib.h>
+#include "nsIPrefService.h"
+#include "nsIPrefBranch.h"
+#include "mozilla/dom/EncodingUtils.h"
+#include "mozilla/dom/ContentParent.h"
+
+using mozilla::dom::ContentParent;
+using mozilla::dom::EncodingUtils;
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(mozHunspell)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(mozHunspell)
+
+NS_INTERFACE_MAP_BEGIN(mozHunspell)
+  NS_INTERFACE_MAP_ENTRY(mozISpellCheckingEngine)
+  NS_INTERFACE_MAP_ENTRY(nsIObserver)
+  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
+  NS_INTERFACE_MAP_ENTRY(nsIMemoryReporter)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, mozISpellCheckingEngine)
+  NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(mozHunspell)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTION(mozHunspell,
+                         mPersonalDictionary,
+                         mEncoder,
+                         mDecoder)
+
+template<> mozilla::Atomic<size_t> mozilla::CountingAllocatorBase<HunspellAllocator>::sAmount(0);
+
+mozHunspell::mozHunspell()
+  : mHunspell(nullptr)
+{
+#ifdef DEBUG
+  // There must be only one instance of this class: it reports memory based on
+  // a single static count in HunspellAllocator.
+  static bool hasRun = false;
+  MOZ_ASSERT(!hasRun);
+  hasRun = true;
+#endif
+}
+
+nsresult
+mozHunspell::Init()
+{
+  LoadDictionaryList(false);
+
+  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+  if (obs) {
+    obs->AddObserver(this, "profile-do-change", true);
+    obs->AddObserver(this, "profile-after-change", true);
+  }
+
+  mozilla::RegisterWeakMemoryReporter(this);
+
+  return NS_OK;
+}
+
+mozHunspell::~mozHunspell()
+{
+  mozilla::UnregisterWeakMemoryReporter(this);
+
+  mPersonalDictionary = nullptr;
+  delete mHunspell;
+}
+
+NS_IMETHODIMP mozHunspell::GetDictionary(char16_t **aDictionary)
+{
+  NS_ENSURE_ARG_POINTER(aDictionary);
+
+  *aDictionary = ToNewUnicode(mDictionary);
+  return *aDictionary ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
+}
+
+/* set the Dictionary.
+ * This also Loads the dictionary and initializes the converter using the dictionaries converter
+ */
+NS_IMETHODIMP mozHunspell::SetDictionary(const char16_t *aDictionary)
+{
+  NS_ENSURE_ARG_POINTER(aDictionary);
+
+  if (nsDependentString(aDictionary).IsEmpty()) {
+    delete mHunspell;
+    mHunspell = nullptr;
+    mDictionary.Truncate();
+    mAffixFileName.Truncate();
+    mLanguage.Truncate();
+    mDecoder = nullptr;
+    mEncoder = nullptr;
+
+    return NS_OK;
+  }
+
+  nsIFile* affFile = mDictionaries.GetWeak(nsDependentString(aDictionary));
+  if (!affFile)
+    return NS_ERROR_FILE_NOT_FOUND;
+
+  nsAutoCString dictFileName, affFileName;
+
+  // XXX This isn't really good. nsIFile->NativePath isn't safe for all
+  // character sets on Windows.
+  // A better way would be to QI to nsIFile, and get a filehandle
+  // from there. Only problem is that hunspell wants a path
+
+  nsresult rv = affFile->GetNativePath(affFileName);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (mAffixFileName.Equals(affFileName.get()))
+    return NS_OK;
+
+  dictFileName = affFileName;
+  int32_t dotPos = dictFileName.RFindChar('.');
+  if (dotPos == -1)
+    return NS_ERROR_FAILURE;
+
+  dictFileName.SetLength(dotPos);
+  dictFileName.AppendLiteral(".dic");
+
+  // SetDictionary can be called multiple times, so we might have a
+  // valid mHunspell instance which needs cleaned up.
+  delete mHunspell;
+
+  mDictionary = aDictionary;
+  mAffixFileName = affFileName;
+
+  mHunspell = new Hunspell(affFileName.get(),
+                         dictFileName.get());
+  if (!mHunspell)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  nsDependentCString label(mHunspell->get_dic_encoding());
+  nsAutoCString encoding;
+  if (!EncodingUtils::FindEncodingForLabelNoReplacement(label, encoding)) {
+    return NS_ERROR_UCONV_NOCONV;
+  }
+  mEncoder = EncodingUtils::EncoderForEncoding(encoding);
+  mDecoder = EncodingUtils::DecoderForEncoding(encoding);
+
+  if (mEncoder)
+    mEncoder->SetOutputErrorBehavior(mEncoder->kOnError_Signal, nullptr, '?');
+
+  int32_t pos = mDictionary.FindChar('-');
+  if (pos == -1)
+    pos = mDictionary.FindChar('_');
+
+  if (pos == -1)
+    mLanguage.Assign(mDictionary);
+  else
+    mLanguage = Substring(mDictionary, 0, pos);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP mozHunspell::GetLanguage(char16_t **aLanguage)
+{
+  NS_ENSURE_ARG_POINTER(aLanguage);
+
+  if (mDictionary.IsEmpty())
+    return NS_ERROR_NOT_INITIALIZED;
+
+  *aLanguage = ToNewUnicode(mLanguage);
+  return *aLanguage ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP mozHunspell::GetProvidesPersonalDictionary(bool *aProvidesPersonalDictionary)
+{
+  NS_ENSURE_ARG_POINTER(aProvidesPersonalDictionary);
+
+  *aProvidesPersonalDictionary = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP mozHunspell::GetProvidesWordUtils(bool *aProvidesWordUtils)
+{
+  NS_ENSURE_ARG_POINTER(aProvidesWordUtils);
+
+  *aProvidesWordUtils = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP mozHunspell::GetName(char16_t * *aName)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP mozHunspell::GetCopyright(char16_t * *aCopyright)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP mozHunspell::GetPersonalDictionary(mozIPersonalDictionary * *aPersonalDictionary)
+{
+  *aPersonalDictionary = mPersonalDictionary;
+  NS_IF_ADDREF(*aPersonalDictionary);
+  return NS_OK;
+}
+
+NS_IMETHODIMP mozHunspell::SetPersonalDictionary(mozIPersonalDictionary * aPersonalDictionary)
+{
+  mPersonalDictionary = aPersonalDictionary;
+  return NS_OK;
+}
+
+NS_IMETHODIMP mozHunspell::GetDictionaryList(char16_t ***aDictionaries,
+                                            uint32_t *aCount)
+{
+  if (!aDictionaries || !aCount)
+    return NS_ERROR_NULL_POINTER;
+
+  uint32_t count = 0;
+  char16_t** dicts =
+    (char16_t**) moz_xmalloc(sizeof(char16_t*) * mDictionaries.Count());
+
+  for (auto iter = mDictionaries.Iter(); !iter.Done(); iter.Next()) {
+    dicts[count] = ToNewUnicode(iter.Key());
+    if (!dicts[count]) {
+      while (count) {
+        --count;
+        free(dicts[count]);
+      }
+      free(dicts);
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+
+    ++count;
+  }
+
+  *aDictionaries = dicts;
+  *aCount = count;
+
+  return NS_OK;
+}
+
+void
+mozHunspell::LoadDictionaryList(bool aNotifyChildProcesses)
+{
+  mDictionaries.Clear();
+
+  nsresult rv;
+
+  nsCOMPtr<nsIProperties> dirSvc =
+    do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID);
+  if (!dirSvc)
+    return;
+
+  // find built in dictionaries, or dictionaries specified in
+  // spellchecker.dictionary_path in prefs
+  nsCOMPtr<nsIFile> dictDir;
+
+  // check preferences first
+  nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID));
+  if (prefs) {
+    nsCString extDictPath;
+    rv = prefs->GetCharPref("spellchecker.dictionary_path", getter_Copies(extDictPath));
+    if (NS_SUCCEEDED(rv)) {
+      // set the spellchecker.dictionary_path
+      rv = NS_NewNativeLocalFile(extDictPath, true, getter_AddRefs(dictDir));
+    }
+  }
+  if (!dictDir) {
+    // spellcheck.dictionary_path not found, set internal path
+    rv = dirSvc->Get(DICTIONARY_SEARCH_DIRECTORY,
+                     NS_GET_IID(nsIFile), getter_AddRefs(dictDir));
+  }
+  if (dictDir) {
+    LoadDictionariesFromDir(dictDir);
+  }
+  else {
+    // try to load gredir/dictionaries
+    nsCOMPtr<nsIFile> greDir;
+    rv = dirSvc->Get(NS_GRE_DIR,
+                     NS_GET_IID(nsIFile), getter_AddRefs(greDir));
+    if (NS_SUCCEEDED(rv)) {
+      greDir->AppendNative(NS_LITERAL_CSTRING("dictionaries"));
+      LoadDictionariesFromDir(greDir);
+    }
+
+    // try to load appdir/dictionaries only if different than gredir
+    nsCOMPtr<nsIFile> appDir;
+    rv = dirSvc->Get(NS_XPCOM_CURRENT_PROCESS_DIR,
+                     NS_GET_IID(nsIFile), getter_AddRefs(appDir));
+    bool equals;
+    if (NS_SUCCEEDED(rv) && NS_SUCCEEDED(appDir->Equals(greDir, &equals)) && !equals) {
+      appDir->AppendNative(NS_LITERAL_CSTRING("dictionaries"));
+      LoadDictionariesFromDir(appDir);
+    }
+  }
+
+  // find dictionaries in DICPATH
+  char* dicEnv = PR_GetEnv("DICPATH");
+  if (dicEnv) {
+    // do a two-pass dance so dictionaries are loaded right-to-left as preference
+    nsTArray<nsCOMPtr<nsIFile>> dirs;
+    nsAutoCString env(dicEnv); // assume dicEnv is UTF-8
+
+    char* currPath = nullptr;
+    char* nextPaths = env.BeginWriting();
+    while ((currPath = NS_strtok(":", &nextPaths))) {
+      nsCOMPtr<nsIFile> dir;
+      rv = NS_NewNativeLocalFile(nsCString(currPath), true, getter_AddRefs(dir));
+      if (NS_SUCCEEDED(rv)) {
+        dirs.AppendElement(dir);
+      }
+    }
+
+    // load them in reverse order so they override each other properly
+    for (int32_t i = dirs.Length() - 1; i >= 0; i--) {
+      LoadDictionariesFromDir(dirs[i]);
+    }
+  }
+
+  // find dictionaries from extensions requiring restart
+  nsCOMPtr<nsISimpleEnumerator> dictDirs;
+  rv = dirSvc->Get(DICTIONARY_SEARCH_DIRECTORY_LIST,
+                   NS_GET_IID(nsISimpleEnumerator), getter_AddRefs(dictDirs));
+  if (NS_FAILED(rv))
+    return;
+
+  bool hasMore;
+  while (NS_SUCCEEDED(dictDirs->HasMoreElements(&hasMore)) && hasMore) {
+    nsCOMPtr<nsISupports> elem;
+    dictDirs->GetNext(getter_AddRefs(elem));
+
+    dictDir = do_QueryInterface(elem);
+    if (dictDir)
+      LoadDictionariesFromDir(dictDir);
+  }
+
+  // find dictionaries from restartless extensions
+  for (int32_t i = 0; i < mDynamicDirectories.Count(); i++) {
+    LoadDictionariesFromDir(mDynamicDirectories[i]);
+  }
+
+  // Now we have finished updating the list of dictionaries, update the current
+  // dictionary and any editors which may use it.
+  mozInlineSpellChecker::UpdateCanEnableInlineSpellChecking();
+
+  if (aNotifyChildProcesses) {
+    ContentParent::NotifyUpdatedDictionaries();
+  }
+
+  // Check if the current dictionary is still available.
+  // If not, try to replace it with another dictionary of the same language.
+  if (!mDictionary.IsEmpty()) {
+    rv = SetDictionary(mDictionary.get());
+    if (NS_SUCCEEDED(rv))
+      return;
+  }
+
+  // If the current dictionary has gone, and we don't have a good replacement,
+  // set no current dictionary.
+  if (!mDictionary.IsEmpty()) {
+    SetDictionary(EmptyString().get());
+  }
+}
+
+NS_IMETHODIMP
+mozHunspell::LoadDictionariesFromDir(nsIFile* aDir)
+{
+  nsresult rv;
+
+  bool check = false;
+  rv = aDir->Exists(&check);
+  if (NS_FAILED(rv) || !check)
+    return NS_ERROR_UNEXPECTED;
+
+  rv = aDir->IsDirectory(&check);
+  if (NS_FAILED(rv) || !check)
+    return NS_ERROR_UNEXPECTED;
+
+  nsCOMPtr<nsISimpleEnumerator> e;
+  rv = aDir->GetDirectoryEntries(getter_AddRefs(e));
+  if (NS_FAILED(rv))
+    return NS_ERROR_UNEXPECTED;
+
+  nsCOMPtr<nsIDirectoryEnumerator> files(do_QueryInterface(e));
+  if (!files)
+    return NS_ERROR_UNEXPECTED;
+
+  nsCOMPtr<nsIFile> file;
+  while (NS_SUCCEEDED(files->GetNextFile(getter_AddRefs(file))) && file) {
+    nsAutoString leafName;
+    file->GetLeafName(leafName);
+    if (!StringEndsWith(leafName, NS_LITERAL_STRING(".dic")))
+      continue;
+
+    nsAutoString dict(leafName);
+    dict.SetLength(dict.Length() - 4); // magic length of ".dic"
+
+    // check for the presence of the .aff file
+    leafName = dict;
+    leafName.AppendLiteral(".aff");
+    file->SetLeafName(leafName);
+    rv = file->Exists(&check);
+    if (NS_FAILED(rv) || !check)
+      continue;
+
+#ifdef DEBUG_bsmedberg
+    printf("Adding dictionary: %s\n", NS_ConvertUTF16toUTF8(dict).get());
+#endif
+
+    // Replace '_' separator with '-'
+    dict.ReplaceChar("_", '-');
+
+    mDictionaries.Put(dict, file);
+  }
+
+  return NS_OK;
+}
+
+nsresult mozHunspell::ConvertCharset(const char16_t* aStr, char ** aDst)
+{
+  NS_ENSURE_ARG_POINTER(aDst);
+  NS_ENSURE_TRUE(mEncoder, NS_ERROR_NULL_POINTER);
+
+  int32_t outLength;
+  int32_t inLength = NS_strlen(aStr);
+  nsresult rv = mEncoder->GetMaxLength(aStr, inLength, &outLength);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  *aDst = (char *) moz_xmalloc(sizeof(char) * (outLength+1));
+  NS_ENSURE_TRUE(*aDst, NS_ERROR_OUT_OF_MEMORY);
+
+  rv = mEncoder->Convert(aStr, &inLength, *aDst, &outLength);
+  if (NS_SUCCEEDED(rv))
+    (*aDst)[outLength] = '\0';
+
+  return rv;
+}
+
+NS_IMETHODIMP
+mozHunspell::CollectReports(nsIHandleReportCallback* aHandleReport,
+                            nsISupports* aData, bool aAnonymize)
+{
+  MOZ_COLLECT_REPORT(
+    "explicit/spell-check", KIND_HEAP, UNITS_BYTES,
+    HunspellAllocator::MemoryAllocated(),
+    "Memory used by the spell-checking engine.");
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP mozHunspell::Check(const char16_t *aWord, bool *aResult)
+{
+  NS_ENSURE_ARG_POINTER(aWord);
+  NS_ENSURE_ARG_POINTER(aResult);
+  NS_ENSURE_TRUE(mHunspell, NS_ERROR_FAILURE);
+
+  nsXPIDLCString charsetWord;
+  nsresult rv = ConvertCharset(aWord, getter_Copies(charsetWord));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  *aResult = !!mHunspell->spell(charsetWord);
+
+
+  if (!*aResult && mPersonalDictionary)
+    rv = mPersonalDictionary->Check(aWord, mLanguage.get(), aResult);
+
+  return rv;
+}
+
+NS_IMETHODIMP mozHunspell::Suggest(const char16_t *aWord, char16_t ***aSuggestions, uint32_t *aSuggestionCount)
+{
+  NS_ENSURE_ARG_POINTER(aSuggestions);
+  NS_ENSURE_ARG_POINTER(aSuggestionCount);
+  NS_ENSURE_TRUE(mHunspell, NS_ERROR_FAILURE);
+
+  nsresult rv;
+  *aSuggestionCount = 0;
+
+  nsXPIDLCString charsetWord;
+  rv = ConvertCharset(aWord, getter_Copies(charsetWord));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  char ** wlst;
+  *aSuggestionCount = mHunspell->suggest(&wlst, charsetWord);
+
+  if (*aSuggestionCount) {
+    *aSuggestions  = (char16_t **)moz_xmalloc(*aSuggestionCount * sizeof(char16_t *));
+    if (*aSuggestions) {
+      uint32_t index = 0;
+      for (index = 0; index < *aSuggestionCount && NS_SUCCEEDED(rv); ++index) {
+        // Convert the suggestion to utf16
+        int32_t inLength = strlen(wlst[index]);
+        int32_t outLength;
+        rv = mDecoder->GetMaxLength(wlst[index], inLength, &outLength);
+        if (NS_SUCCEEDED(rv))
+        {
+          (*aSuggestions)[index] = (char16_t *) moz_xmalloc(sizeof(char16_t) * (outLength+1));
+          if ((*aSuggestions)[index])
+          {
+            rv = mDecoder->Convert(wlst[index], &inLength, (*aSuggestions)[index], &outLength);
+            if (NS_SUCCEEDED(rv))
+              (*aSuggestions)[index][outLength] = 0;
+          }
+          else
+            rv = NS_ERROR_OUT_OF_MEMORY;
+        }
+      }
+
+      if (NS_FAILED(rv))
+        NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(index, *aSuggestions); // free the char16_t strings up to the point at which the error occurred
+    }
+    else // if (*aSuggestions)
+      rv = NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(*aSuggestionCount, wlst);
+  return rv;
+}
+
+NS_IMETHODIMP
+mozHunspell::Observe(nsISupports* aSubj, const char *aTopic,
+                    const char16_t *aData)
+{
+  NS_ASSERTION(!strcmp(aTopic, "profile-do-change")
+               || !strcmp(aTopic, "profile-after-change"),
+               "Unexpected observer topic");
+
+  LoadDictionaryList(false);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP mozHunspell::AddDirectory(nsIFile *aDir)
+{
+  mDynamicDirectories.AppendObject(aDir);
+  LoadDictionaryList(true);
+  return NS_OK;
+}
+
+NS_IMETHODIMP mozHunspell::RemoveDirectory(nsIFile *aDir)
+{
+  mDynamicDirectories.RemoveObject(aDir);
+  LoadDictionaryList(true);
+
+#ifdef MOZ_THUNDERBIRD
+  /*
+   * This notification is needed for Thunderbird. Thunderbird derives the dictionary
+   * from the document's "lang" attribute. If a dictionary is removed,
+   * we need to change the "lang" attribute.
+   */
+  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+  if (obs) {
+    obs->NotifyObservers(nullptr,
+                         SPELLCHECK_DICTIONARY_REMOVE_NOTIFICATION,
+                         nullptr);
+  }
+#endif
+  return NS_OK;
+}