chrome/renderer/spellchecker/spellcheck_language.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_LANGUAGE_H_
   6 #define CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_LANGUAGE_H_
   7
   8 #include <queue>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/files/file.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/strings/string16.h"
  15 #include "chrome/renderer/spellchecker/spellcheck_worditerator.h"
  16
  17 class SpellingEngine;
  18
  19 class SpellcheckLanguage {
  20  public:
  21   SpellcheckLanguage();
  22   ~SpellcheckLanguage();
  23
  24   void Init(base::File file, const std::string& language);
  25
  26   // SpellCheck a word.
  27   // Returns true if spelled correctly, false otherwise.
  28   // If the spellchecker failed to initialize, always returns true.
  29   // TODO(groby): This is not true in the multilingual case any more!
  30   // The |tag| parameter should either be a unique identifier for the document
  31   // that the word came from (if the current platform requires it), or 0.
  32   // In addition, finds the suggested words for a given word
  33   // and puts them into |*optional_suggestions|.
  34   // If the word is spelled correctly, the vector is empty.
  35   // If optional_suggestions is NULL, suggested words will not be looked up.
  36   // Note that doing suggest lookups can be slow.
  37   bool SpellCheckWord(const base::char16* in_word,
  38                       int in_word_len,
  39                       int tag,
  40                       int* misspelling_start,
  41                       int* misspelling_len,
  42                       std::vector<base::string16>* optional_suggestions);
  43
  44   // Initialize |spellcheck_| if that hasn't happened yet.
  45   bool InitializeIfNeeded();
  46
  47   // Return true if the underlying spellcheck engine is enabled.
  48   bool IsEnabled();
  49
  50  private:
  51   friend class SpellCheckTest;
  52
  53   // Returns whether or not the given word is a contraction of valid words
  54   // (e.g. "word:word").
  55   bool IsValidContraction(const base::string16& word, int tag);
  56
  57   // Represents character attributes used for filtering out characters which
  58   // are not supported by this SpellCheck object.
  59   SpellcheckCharAttribute character_attributes_;
  60
  61   // Represents word iterators used in this spellchecker. The |text_iterator_|
  62   // splits text provided by WebKit into words, contractions, or concatenated
  63   // words. The |contraction_iterator_| splits a concatenated word extracted by
  64   // |text_iterator_| into word components so we can treat a concatenated word
  65   // consisting only of correct words as a correct word.
  66   SpellcheckWordIterator text_iterator_;
  67   SpellcheckWordIterator contraction_iterator_;
  68
  69   // Pointer to a platform-specific spelling engine, if it is in use. This
  70   // should only be set if hunspell is not used. (I.e. on OSX, for now)
  71   scoped_ptr<SpellingEngine> platform_spelling_engine_;
  72
  73   DISALLOW_COPY_AND_ASSIGN(SpellcheckLanguage);
  74 };
  75
  76 #endif  // CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_LANGUAGE_H_