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mozHunspell.cpp (18078B)


      1 /******* BEGIN LICENSE BLOCK *******
      2 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
      3 *
      4 * The contents of this file are subject to the Mozilla Public License Version
      5 * 1.1 (the "License"); you may not use this file except in compliance with
      6 * the License. You may obtain a copy of the License at
      7 * http://www.mozilla.org/MPL/
      8 *
      9 * Software distributed under the License is distributed on an "AS IS" basis,
     10 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
     11 * for the specific language governing rights and limitations under the
     12 * License.
     13 *
     14 * The Initial Developers of the Original Code are Kevin Hendricks (MySpell)
     15 * and László Németh (Hunspell). Portions created by the Initial Developers
     16 * are Copyright (C) 2002-2005 the Initial Developers. All Rights Reserved.
     17 *
     18 * Contributor(s): Kevin Hendricks (kevin.hendricks@sympatico.ca)
     19 *                 David Einstein (deinst@world.std.com)
     20 *                 Michiel van Leeuwen (mvl@exedo.nl)
     21 *                 Caolan McNamara (cmc@openoffice.org)
     22 *                 László Németh (nemethl@gyorsposta.hu)
     23 *                 Davide Prina
     24 *                 Giuseppe Modugno
     25 *                 Gianluca Turconi
     26 *                 Simon Brouwer
     27 *                 Noll Janos
     28 *                 Biro Arpad
     29 *                 Goldman Eleonora
     30 *                 Sarlos Tamas
     31 *                 Bencsath Boldizsar
     32 *                 Halacsy Peter
     33 *                 Dvornik Laszlo
     34 *                 Gefferth Andras
     35 *                 Nagy Viktor
     36 *                 Varga Daniel
     37 *                 Chris Halls
     38 *                 Rene Engelhard
     39 *                 Bram Moolenaar
     40 *                 Dafydd Jones
     41 *                 Harri Pitkanen
     42 *                 Andras Timar
     43 *                 Tor Lillqvist
     44 *                 Jesper Kristensen (mail@jesperkristensen.dk)
     45 *
     46 * Alternatively, the contents of this file may be used under the terms of
     47 * either the GNU General Public License Version 2 or later (the "GPL"), or
     48 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
     49 * in which case the provisions of the GPL or the LGPL are applicable instead
     50 * of those above. If you wish to allow use of your version of this file only
     51 * under the terms of either the GPL or the LGPL, and not to allow others to
     52 * use your version of this file under the terms of the MPL, indicate your
     53 * decision by deleting the provisions above and replace them with the notice
     54 * and other provisions required by the GPL or the LGPL. If you do not delete
     55 * the provisions above, a recipient may use your version of this file under
     56 * the terms of any one of the MPL, the GPL or the LGPL.
     57 *
     58 ******* END LICENSE BLOCK *******/
     59 
     60 #include "mozHunspell.h"
     61 #include "nsReadableUtils.h"
     62 #include "nsString.h"
     63 #include "nsIObserverService.h"
     64 #include "nsIDirectoryEnumerator.h"
     65 #include "nsIFile.h"
     66 #include "nsUnicharUtils.h"
     67 #include "nsCRT.h"
     68 #include "mozInlineSpellChecker.h"
     69 #include "nsIPrefBranch.h"
     70 #include "nsIPrefService.h"
     71 #include "nsNetUtil.h"
     72 #include "prenv.h"
     73 #include "mozilla/Components.h"
     74 #include "mozilla/Services.h"
     75 #include "mozilla/dom/ContentParent_NotifyUpdatedDictionaries.h"
     76 
     77 #include <tuple>
     78 
     79 using namespace mozilla;
     80 
     81 NS_IMPL_CYCLE_COLLECTING_ADDREF(mozHunspell)
     82 NS_IMPL_CYCLE_COLLECTING_RELEASE(mozHunspell)
     83 
     84 NS_INTERFACE_MAP_BEGIN(mozHunspell)
     85  NS_INTERFACE_MAP_ENTRY(mozISpellCheckingEngine)
     86  NS_INTERFACE_MAP_ENTRY(nsIObserver)
     87  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
     88  NS_INTERFACE_MAP_ENTRY(nsIMemoryReporter)
     89  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, mozISpellCheckingEngine)
     90  NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(mozHunspell)
     91 NS_INTERFACE_MAP_END
     92 
     93 NS_IMPL_CYCLE_COLLECTION_WEAK(mozHunspell, mPersonalDictionary)
     94 
     95 NS_IMPL_COMPONENT_FACTORY(mozHunspell) {
     96  auto hunspell = MakeRefPtr<mozHunspell>();
     97  if (NS_SUCCEEDED(hunspell->Init())) {
     98    return hunspell.forget().downcast<mozISpellCheckingEngine>();
     99  }
    100  return nullptr;
    101 }
    102 
    103 mozHunspell::mozHunspell() {
    104 #ifdef DEBUG
    105  // There must be only one instance of this class: it reports memory based on
    106  // a single static count in HunspellAllocator.
    107  static bool hasRun = false;
    108  MOZ_ASSERT(!hasRun);
    109  hasRun = true;
    110 #endif
    111 }
    112 
    113 nsresult mozHunspell::Init() {
    114  LoadDictionaryList(false);
    115 
    116  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
    117  if (obs) {
    118    obs->AddObserver(this, "profile-do-change", true);
    119    obs->AddObserver(this, "profile-after-change", true);
    120  }
    121 
    122  mozilla::RegisterWeakMemoryReporter(this);
    123 
    124  return NS_OK;
    125 }
    126 
    127 mozHunspell::~mozHunspell() {
    128  mozilla::UnregisterWeakMemoryReporter(this);
    129 
    130  mPersonalDictionary = nullptr;
    131  mHunspells.Clear();
    132 }
    133 
    134 NS_IMETHODIMP
    135 mozHunspell::GetDictionaries(nsTArray<nsCString>& aDictionaries) {
    136  MOZ_ASSERT(aDictionaries.IsEmpty());
    137  for (auto iter = mHunspells.ConstIter(); !iter.Done(); iter.Next()) {
    138    if (iter.Data().mEnabled) {
    139      aDictionaries.AppendElement(iter.Key());
    140    }
    141  }
    142  return NS_OK;
    143 }
    144 
    145 /* Set the Dictionaries.
    146 * This also Loads the dictionaries and initializes the converter using the
    147 * dictionaries converter
    148 */
    149 NS_IMETHODIMP
    150 mozHunspell::SetDictionaries(const nsTArray<nsCString>& aDictionaries) {
    151  if (aDictionaries.IsEmpty()) {
    152    mHunspells.Clear();
    153    return NS_OK;
    154  }
    155 
    156  // Disable any dictionaries we've already loaded that we're not
    157  // going to use.
    158  for (auto iter = mHunspells.Iter(); !iter.Done(); iter.Next()) {
    159    if (!aDictionaries.Contains(iter.Key())) {
    160      iter.Data().mEnabled = false;
    161    }
    162  }
    163 
    164  bool firstDictionary = true;
    165  for (const auto& dictionary : aDictionaries) {
    166    NS_ConvertUTF8toUTF16 dict(dictionary);
    167    nsIURI* affFile = mDictionaries.GetWeak(dict);
    168    if (!affFile) {
    169      return NS_ERROR_FILE_NOT_FOUND;
    170    }
    171 
    172    nsAutoCString affFileName;
    173    nsresult rv = affFile->GetSpec(affFileName);
    174    NS_ENSURE_SUCCESS(rv, rv);
    175 
    176    if (auto entry = mHunspells.Lookup(dictionary)) {
    177      if (entry.Data().mAffixFileName == affFileName) {
    178        entry.Data().mEnabled = true;
    179        continue;
    180      }
    181    }
    182 
    183    DictionaryData dictionaryData;
    184    dictionaryData.mAffixFileName = affFileName;
    185 
    186    // Load the first dictionary now, we'll load the others lazily during
    187    // checking.
    188    if (firstDictionary) {
    189      rv = dictionaryData.LoadIfNecessary();
    190      NS_ENSURE_SUCCESS(rv, rv);
    191      firstDictionary = false;
    192    }
    193 
    194    mHunspells.InsertOrUpdate(dictionary, std::move(dictionaryData));
    195  }
    196 
    197  // If we have a large number of dictionaries loaded, try freeing any disabled
    198  // dictionaries to limit memory use.
    199  if (mHunspells.Count() > 10) {
    200    mHunspells.RemoveIf([](const auto& iter) { return !iter.Data().mEnabled; });
    201  }
    202 
    203  return NS_OK;
    204 }
    205 
    206 NS_IMETHODIMP mozHunspell::GetPersonalDictionary(
    207    mozIPersonalDictionary** aPersonalDictionary) {
    208  *aPersonalDictionary = mPersonalDictionary;
    209  NS_IF_ADDREF(*aPersonalDictionary);
    210  return NS_OK;
    211 }
    212 
    213 NS_IMETHODIMP mozHunspell::SetPersonalDictionary(
    214    mozIPersonalDictionary* aPersonalDictionary) {
    215  mPersonalDictionary = aPersonalDictionary;
    216  return NS_OK;
    217 }
    218 
    219 NS_IMETHODIMP mozHunspell::GetDictionaryList(
    220    nsTArray<nsCString>& aDictionaries) {
    221  MOZ_ASSERT(aDictionaries.IsEmpty());
    222  for (const auto& key : mDictionaries.Keys()) {
    223    aDictionaries.AppendElement(NS_ConvertUTF16toUTF8(key));
    224  }
    225 
    226  return NS_OK;
    227 }
    228 
    229 void mozHunspell::LoadDictionaryList(bool aNotifyChildProcesses) {
    230  mDictionaries.Clear();
    231 
    232  nsresult rv;
    233 
    234  // find built in dictionaries, or dictionaries specified in
    235  // spellchecker.dictionary_path in prefs
    236  nsCOMPtr<nsIFile> dictDir;
    237 
    238  // check preferences first
    239  nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID));
    240  if (prefs) {
    241    nsAutoCString extDictPath;
    242    rv = prefs->GetCharPref("spellchecker.dictionary_path", extDictPath);
    243    if (NS_SUCCEEDED(rv)) {
    244      // set the spellchecker.dictionary_path
    245      rv = NS_NewNativeLocalFile(extDictPath, getter_AddRefs(dictDir));
    246    }
    247    if (dictDir) {
    248      LoadDictionariesFromDir(dictDir);
    249    }
    250  }
    251 
    252  // find dictionaries in DICPATH
    253  char* dicEnv = PR_GetEnv("DICPATH");
    254  if (dicEnv) {
    255    // do a two-pass dance so dictionaries are loaded right-to-left as
    256    // preference
    257    nsTArray<nsCOMPtr<nsIFile>> dirs;
    258    nsAutoCString env(dicEnv);  // assume dicEnv is UTF-8
    259 
    260    char* currPath = nullptr;
    261    char* nextPaths = env.BeginWriting();
    262    while ((currPath = NS_strtok(":", &nextPaths))) {
    263      nsCOMPtr<nsIFile> dir;
    264      rv = NS_NewNativeLocalFile(nsCString(currPath), getter_AddRefs(dir));
    265      if (NS_SUCCEEDED(rv)) {
    266        dirs.AppendElement(dir);
    267      }
    268    }
    269 
    270    // load them in reverse order so they override each other properly
    271    for (int32_t i = dirs.Length() - 1; i >= 0; i--) {
    272      LoadDictionariesFromDir(dirs[i]);
    273    }
    274  }
    275 
    276  // find dictionaries from restartless extensions
    277  for (int32_t i = 0; i < mDynamicDirectories.Count(); i++) {
    278    LoadDictionariesFromDir(mDynamicDirectories[i]);
    279  }
    280 
    281  for (const auto& dictionaryEntry : mDynamicDictionaries) {
    282    mDictionaries.InsertOrUpdate(dictionaryEntry.GetKey(),
    283                                 dictionaryEntry.GetData());
    284  }
    285 
    286  DictionariesChanged(aNotifyChildProcesses);
    287 }
    288 
    289 void mozHunspell::DictionariesChanged(bool aNotifyChildProcesses) {
    290  // Now we have finished updating the list of dictionaries, update the current
    291  // dictionary and any editors which may use it.
    292  mozInlineSpellChecker::UpdateCanEnableInlineSpellChecking();
    293 
    294  if (aNotifyChildProcesses) {
    295    mozilla::dom::ContentParent_NotifyUpdatedDictionaries();
    296  }
    297 
    298  // Check if the current dictionaries are still available.
    299  // If not, try to replace it with other dictionaries of the same language.
    300  if (!mHunspells.IsEmpty()) {
    301    nsTArray<nsCString> dictionaries;
    302    for (auto iter = mHunspells.ConstIter(); !iter.Done(); iter.Next()) {
    303      if (iter.Data().mEnabled) {
    304        dictionaries.AppendElement(iter.Key());
    305      }
    306    }
    307    nsresult rv = SetDictionaries(dictionaries);
    308    if (NS_SUCCEEDED(rv)) return;
    309  }
    310 
    311  // If the current dictionaries are gone, and we don't have a good replacement,
    312  // set no current dictionary.
    313  if (!mHunspells.IsEmpty()) {
    314    nsTArray<nsCString> empty;
    315    SetDictionaries(empty);
    316  }
    317 }
    318 
    319 NS_IMETHODIMP
    320 mozHunspell::LoadDictionariesFromDir(nsIFile* aDir) {
    321  nsresult rv;
    322 
    323  bool check = false;
    324  rv = aDir->Exists(&check);
    325  if (NS_FAILED(rv) || !check) return NS_ERROR_UNEXPECTED;
    326 
    327  rv = aDir->IsDirectory(&check);
    328  if (NS_FAILED(rv) || !check) return NS_ERROR_UNEXPECTED;
    329 
    330  nsCOMPtr<nsIDirectoryEnumerator> files;
    331  rv = aDir->GetDirectoryEntries(getter_AddRefs(files));
    332  if (NS_FAILED(rv)) return NS_ERROR_UNEXPECTED;
    333 
    334  nsCOMPtr<nsIFile> file;
    335  while (NS_SUCCEEDED(files->GetNextFile(getter_AddRefs(file))) && file) {
    336    nsAutoString leafName;
    337    file->GetLeafName(leafName);
    338    if (!StringEndsWith(leafName, u".dic"_ns)) continue;
    339 
    340    nsAutoString dict(leafName);
    341    dict.SetLength(dict.Length() - 4);  // magic length of ".dic"
    342 
    343    // check for the presence of the .aff file
    344    leafName = dict;
    345    leafName.AppendLiteral(".aff");
    346    file->SetLeafName(leafName);
    347    rv = file->Exists(&check);
    348    if (NS_FAILED(rv) || !check) continue;
    349 
    350    // Replace '_' separator with '-'
    351    dict.ReplaceChar('_', '-');
    352 
    353    nsCOMPtr<nsIURI> uri;
    354    rv = NS_NewFileURI(getter_AddRefs(uri), file);
    355    NS_ENSURE_SUCCESS(rv, rv);
    356 
    357    mDictionaries.InsertOrUpdate(dict, uri);
    358  }
    359 
    360  return NS_OK;
    361 }
    362 
    363 nsresult mozHunspell::DictionaryData::ConvertCharset(const nsAString& aStr,
    364                                                     std::string& aDst) {
    365  if (NS_WARN_IF(!mEncoder)) {
    366    return NS_ERROR_NOT_INITIALIZED;
    367  }
    368 
    369  auto src = Span(aStr.BeginReading(), aStr.Length());
    370  CheckedInt<size_t> needed =
    371      mEncoder->MaxBufferLengthFromUTF16WithoutReplacement(src.Length());
    372  if (!needed.isValid()) {
    373    return NS_ERROR_OUT_OF_MEMORY;
    374  }
    375 
    376  aDst.resize(needed.value());
    377 
    378  char* dstPtr = &aDst[0];
    379  auto dst = Span(reinterpret_cast<uint8_t*>(dstPtr), needed.value());
    380 
    381  uint32_t result;
    382  size_t written;
    383  std::tie(result, std::ignore, written) =
    384      mEncoder->EncodeFromUTF16WithoutReplacement(src, dst, true);
    385  MOZ_ASSERT(result != kOutputFull);
    386  if (result != kInputEmpty) {
    387    return NS_ERROR_UENC_NOMAPPING;
    388  }
    389  aDst.resize(written);
    390  mEncoder->Encoding()->NewEncoderInto(*mEncoder);
    391  return NS_OK;
    392 }
    393 
    394 nsresult mozHunspell::DictionaryData::LoadIfNecessary() {
    395  if (mHunspell && mEncoder && mDecoder) {
    396    return NS_OK;
    397  }
    398 
    399  if (mLoadFailed) {
    400    return NS_ERROR_FAILURE;
    401  }
    402 
    403  nsCString dictFileName = mAffixFileName;
    404  int32_t dotPos = dictFileName.RFindChar('.');
    405  if (dotPos == -1) {
    406    mLoadFailed = true;
    407    return NS_ERROR_FAILURE;
    408  }
    409  dictFileName.SetLength(dotPos);
    410  dictFileName.AppendLiteral(".dic");
    411 
    412  UniquePtr<RLBoxHunspell> hunspell(
    413      RLBoxHunspell::Create(mAffixFileName, dictFileName));
    414  if (!hunspell) {
    415    mLoadFailed = true;
    416    // TODO Bug 1788857: Verify error propagation in case of inaccessible file
    417    return NS_ERROR_OUT_OF_MEMORY;
    418  }
    419  mHunspell = std::move(hunspell);
    420  auto encoding =
    421      Encoding::ForLabelNoReplacement(mHunspell->get_dict_encoding());
    422  if (!encoding) {
    423    mLoadFailed = true;
    424    return NS_ERROR_UCONV_NOCONV;
    425  }
    426  mEncoder = encoding->NewEncoder();
    427  mDecoder = encoding->NewDecoderWithoutBOMHandling();
    428  return NS_OK;
    429 }
    430 
    431 NS_IMETHODIMP
    432 mozHunspell::CollectReports(nsIHandleReportCallback* aHandleReport,
    433                            nsISupports* aData, bool aAnonymize) {
    434  MOZ_COLLECT_REPORT("explicit/spell-check", KIND_HEAP, UNITS_BYTES,
    435                     HunspellAllocator::MemoryAllocated(),
    436                     "Memory used by the spell-checking engine.");
    437 
    438  return NS_OK;
    439 }
    440 
    441 NS_IMETHODIMP
    442 mozHunspell::Check(const nsAString& aWord, bool* aResult) {
    443  if (NS_WARN_IF(!aResult)) {
    444    return NS_ERROR_INVALID_ARG;
    445  }
    446 
    447  if (NS_WARN_IF(mHunspells.IsEmpty())) {
    448    return NS_ERROR_FAILURE;
    449  }
    450 
    451  *aResult = true;
    452  for (auto iter = mHunspells.Iter(); !iter.Done(); iter.Next()) {
    453    if (!iter.Data().mEnabled) {
    454      continue;
    455    }
    456 
    457    nsresult rv = iter.Data().LoadIfNecessary();
    458    if (NS_FAILED(rv)) {
    459      continue;
    460    }
    461 
    462    std::string charsetWord;
    463    rv = iter.Data().ConvertCharset(aWord, charsetWord);
    464    if (NS_FAILED(rv)) {
    465      continue;
    466    }
    467 
    468    // Depending upon the encoding, we might end up with a string that begins
    469    // with the null byte. Since the hunspell interface uses C-style strings,
    470    // this appears like an empty string, and hunspell marks empty strings as
    471    // spelled correctly. Skip these cases to allow another dictionary to have
    472    // the chance to spellcheck them.
    473    if (charsetWord.empty() || charsetWord[0] == 0) {
    474      continue;
    475    }
    476 
    477    *aResult = iter.Data().mHunspell->spell(charsetWord);
    478    if (*aResult) {
    479      break;
    480    }
    481  }
    482 
    483  if (!*aResult && mPersonalDictionary) {
    484    return mPersonalDictionary->Check(aWord, aResult);
    485  }
    486 
    487  return NS_OK;
    488 }
    489 
    490 NS_IMETHODIMP
    491 mozHunspell::Suggest(const nsAString& aWord, nsTArray<nsString>& aSuggestions) {
    492  if (NS_WARN_IF(mHunspells.IsEmpty())) {
    493    return NS_ERROR_FAILURE;
    494  }
    495 
    496  MOZ_ASSERT(aSuggestions.IsEmpty());
    497 
    498  for (auto iter = mHunspells.Iter(); !iter.Done(); iter.Next()) {
    499    if (!iter.Data().mEnabled) {
    500      continue;
    501    }
    502 
    503    nsresult rv = iter.Data().LoadIfNecessary();
    504    if (NS_FAILED(rv)) {
    505      continue;
    506    }
    507 
    508    std::string charsetWord;
    509    rv = iter.Data().ConvertCharset(aWord, charsetWord);
    510    NS_ENSURE_SUCCESS(rv, rv);
    511 
    512    std::vector<std::string> suggestions =
    513        iter.Data().mHunspell->suggest(charsetWord);
    514    if (!suggestions.empty()) {
    515      aSuggestions.SetCapacity(aSuggestions.Length() + suggestions.size());
    516      for (Span<const char> charSrc : suggestions) {
    517        // Convert the suggestion to utf16
    518        auto src = AsBytes(charSrc);
    519        nsresult rv =
    520            iter.Data().mDecoder->Encoding()->DecodeWithoutBOMHandling(
    521                src, *aSuggestions.AppendElement());
    522        NS_ENSURE_SUCCESS(rv, rv);
    523        iter.Data().mDecoder->Encoding()->NewDecoderWithoutBOMHandlingInto(
    524            *iter.Data().mDecoder);
    525      }
    526    }
    527  }
    528 
    529  return NS_OK;
    530 }
    531 
    532 NS_IMETHODIMP
    533 mozHunspell::Observe(nsISupports* aSubj, const char* aTopic,
    534                     const char16_t* aData) {
    535  NS_ASSERTION(!strcmp(aTopic, "profile-do-change") ||
    536                   !strcmp(aTopic, "profile-after-change"),
    537               "Unexpected observer topic");
    538 
    539  LoadDictionaryList(false);
    540 
    541  return NS_OK;
    542 }
    543 
    544 NS_IMETHODIMP mozHunspell::AddDirectory(nsIFile* aDir) {
    545  mDynamicDirectories.AppendObject(aDir);
    546  LoadDictionaryList(true);
    547  return NS_OK;
    548 }
    549 
    550 NS_IMETHODIMP mozHunspell::RemoveDirectory(nsIFile* aDir) {
    551  mDynamicDirectories.RemoveObject(aDir);
    552  LoadDictionaryList(true);
    553 
    554 #ifdef MOZ_THUNDERBIRD
    555  /*
    556   * This notification is needed for Thunderbird. Thunderbird derives the
    557   * dictionary from the document's "lang" attribute. If a dictionary is
    558   * removed, we need to change the "lang" attribute.
    559   */
    560  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
    561  if (obs) {
    562    obs->NotifyObservers(nullptr, SPELLCHECK_DICTIONARY_REMOVE_NOTIFICATION,
    563                         nullptr);
    564  }
    565 #endif
    566  return NS_OK;
    567 }
    568 
    569 NS_IMETHODIMP mozHunspell::AddDictionary(const nsAString& aLang,
    570                                         nsIURI* aFile) {
    571  NS_ENSURE_TRUE(aFile, NS_ERROR_INVALID_ARG);
    572 
    573  mDynamicDictionaries.InsertOrUpdate(aLang, aFile);
    574  mDictionaries.InsertOrUpdate(aLang, aFile);
    575  DictionariesChanged(true);
    576  return NS_OK;
    577 }
    578 
    579 NS_IMETHODIMP mozHunspell::RemoveDictionary(const nsAString& aLang,
    580                                            nsIURI* aFile, bool* aRetVal) {
    581  NS_ENSURE_TRUE(aFile, NS_ERROR_INVALID_ARG);
    582  *aRetVal = false;
    583 
    584  nsCOMPtr<nsIURI> file = mDynamicDictionaries.Get(aLang);
    585  bool equal;
    586  if (file && NS_SUCCEEDED(file->Equals(aFile, &equal)) && equal) {
    587    mDynamicDictionaries.Remove(aLang);
    588    LoadDictionaryList(true);
    589    *aRetVal = true;
    590  }
    591  return NS_OK;
    592 }