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spellcheck.h

// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_H_
#define CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_H_

#include <queue>
#include <string>
#include <vector>

#include "app/l10n_util.h"
#include "base/platform_file.h"
#include "base/string16.h"
#include "base/time.h"
#include "chrome/renderer/spellchecker/spellcheck_worditerator.h"
#include "unicode/uscript.h"

class Hunspell;

namespace file_util {
class MemoryMappedFile;
}

class SpellCheck {
 public:
  SpellCheck();

  ~SpellCheck();

  void Init(base::PlatformFile file,
            const std::vector<std::string>& custom_words,
            const std::string language);

  // SpellCheck a word.
  // Returns true if spelled correctly, false otherwise.
  // If the spellchecker failed to initialize, always returns true.
  // The |tag| parameter should either be a unique identifier for the document
  // that the word came from (if the current platform requires it), or 0.
  // In addition, finds the suggested words for a given word
  // and puts them into |*optional_suggestions|.
  // If the word is spelled correctly, the vector is empty.
  // If optional_suggestions is NULL, suggested words will not be looked up.
  // Note that Doing suggest lookups can be slow.
  bool SpellCheckWord(const char16* in_word,
                      int in_word_len,
                      int tag,
                      int* misspelling_start,
                      int* misspelling_len,
                      std::vector<string16>* optional_suggestions);

  // Find a possible correctly spelled word for a misspelled word. Computes an
  // empty string if input misspelled word is too long, there is ambiguity, or
  // the correct spelling cannot be determined.
  // NOTE: If using the platform spellchecker, this will send a *lot* of sync
  // IPCs. We should probably refactor this if we ever plan to take it out from
  // behind its command line flag.
  string16 GetAutoCorrectionWord(const string16& word, int tag);

  // Turn auto spell correct support ON or OFF.
  // |turn_on| = true means turn ON; false means turn OFF.
  void EnableAutoSpellCorrect(bool turn_on);

  // Add a word to the custom list. This may be called before or after
  // |hunspell_| has been initialized.
  void WordAdded(const std::string& word);

 private:
  // Initializes the Hunspell dictionary, or does nothing if |hunspell_| is
  // non-null. This blocks.
  void InitializeHunspell();

  // If there is no dictionary file, then this requests one from the browser
  // and does not block. In this case it returns true.
  // If there is a dictionary file, but Hunspell has not been loaded, then
  // this loads Hunspell.
  // If Hunspell is already loaded, this does nothing. In both the latter cases
  // it returns false, meaning that it is OK to continue spellchecking.
  bool InitializeIfNeeded();

  // When called, relays the request to check the spelling to the proper
  // backend, either hunspell or a platform-specific backend.
  bool CheckSpelling(const string16& word_to_check, int tag);

  // When called, relays the request to fill the list with suggestions to
  // the proper backend, either hunspell or a platform-specific backend.
  void FillSuggestionList(const string16& wrong_word,
                          std::vector<string16>* optional_suggestions);

  // Returns whether or not the given word is a contraction of valid words
  // (e.g. "word:word").
  bool IsValidContraction(const string16& word, int tag);

  // Add the given custom word to |hunspell_|.
  void AddWordToHunspell(const std::string& word);

  // We memory-map the BDict file.
  scoped_ptr<file_util::MemoryMappedFile> bdict_file_;

  // The hunspell dictionary in use.
  scoped_ptr<Hunspell> hunspell_;

  base::PlatformFile file_;
  std::vector<std::string> custom_words_;

  // Represents character attributes used for filtering out characters which
  // are not supported by this SpellCheck object.
  SpellcheckCharAttribute character_attributes_;

  // Remember state for auto spell correct.
  bool auto_spell_correct_turned_on_;

  // True if a platform-specific spellchecking engine is being used,
  // and False if hunspell is being used.
  bool is_using_platform_spelling_engine_;

  // This flags whether we have ever been initialized, or have asked the browser
  // for a dictionary. The value indicates whether we should request a
  // dictionary from the browser when the render view asks us to check the
  // spelling of a word.
  bool initialized_;

  DISALLOW_COPY_AND_ASSIGN(SpellCheck);
};

#endif  // CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_H_

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