chrome/renderer/spellchecker/spellcheck.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_H_
   6 #define CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/files/file.h"
  12 #include "base/gtest_prod_util.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/memory/weak_ptr.h"
  15 #include "base/strings/string16.h"
  16 #include "chrome/renderer/spellchecker/custom_dictionary_engine.h"
  17 #include "chrome/renderer/spellchecker/spellcheck_language.h"
  18 #include "content/public/renderer/render_process_observer.h"
  19 #include "ipc/ipc_platform_file.h"
  20 #include "third_party/WebKit/public/platform/WebVector.h"
  21
  22 struct SpellCheckResult;
  23
  24 namespace blink {
  25 class WebTextCheckingCompletion;
  26 struct WebTextCheckingResult;
  27 }
  28
  29 // TODO(morrita): Needs reorg with SpellCheckProvider.
  30 // See http://crbug.com/73699.
  31 // Shared spellchecking logic/data for a RenderProcess. All RenderViews use
  32 // this object to perform spellchecking tasks.
  33 class SpellCheck : public content::RenderProcessObserver,
  34                    public base::SupportsWeakPtr<SpellCheck> {
  35  public:
  36   // TODO(groby): I wonder if this can be private, non-mac only.
  37   class SpellcheckRequest;
  38   enum ResultFilter {
  39     DO_NOT_MODIFY = 1,  // Do not modify results.
  40     USE_NATIVE_CHECKER,  // Use native checker to double-check.
  41   };
  42
  43   SpellCheck();
  44   ~SpellCheck() override;
  45
  46   // TODO: Try to move that all to SpellcheckLanguage.
  47   void Init(base::File file,
  48             const std::set<std::string>& custom_words,
  49             const std::string& language);
  50
  51   // If there is no dictionary file, then this requests one from the browser
  52   // and does not block. In this case it returns true.
  53   // If there is a dictionary file, but Hunspell has not been loaded, then
  54   // this loads Hunspell.
  55   // If Hunspell is already loaded, this does nothing. In both the latter cases
  56   // it returns false, meaning that it is OK to continue spellchecking.
  57   bool InitializeIfNeeded();
  58
  59   // SpellCheck a word.
  60   // Returns true if spelled correctly, false otherwise.
  61   // If the spellchecker failed to initialize, always returns true.
  62   // The |tag| parameter should either be a unique identifier for the document
  63   // that the word came from (if the current platform requires it), or 0.
  64   // In addition, finds the suggested words for a given word
  65   // and puts them into |*optional_suggestions|.
  66   // If the word is spelled correctly, the vector is empty.
  67   // If optional_suggestions is NULL, suggested words will not be looked up.
  68   // Note that Doing suggest lookups can be slow.
  69   bool SpellCheckWord(const base::char16* in_word,
  70                       int in_word_len,
  71                       int tag,
  72                       int* misspelling_start,
  73                       int* misspelling_len,
  74                       std::vector<base::string16>* optional_suggestions);
  75
  76   // SpellCheck a paragraph.
  77   // Returns true if |text| is correctly spelled, false otherwise.
  78   // If the spellchecker failed to initialize, always returns true.
  79   bool SpellCheckParagraph(
  80       const base::string16& text,
  81       blink::WebVector<blink::WebTextCheckingResult>* results);
  82
  83   // Find a possible correctly spelled word for a misspelled word. Computes an
  84   // empty string if input misspelled word is too long, there is ambiguity, or
  85   // the correct spelling cannot be determined.
  86   // NOTE: If using the platform spellchecker, this will send a *lot* of sync
  87   // IPCs. We should probably refactor this if we ever plan to take it out from
  88   // behind its command line flag.
  89   base::string16 GetAutoCorrectionWord(const base::string16& word, int tag);
  90
  91   // Requests to spellcheck the specified text in the background. This function
  92   // posts a background task and calls SpellCheckParagraph() in the task.
  93 #if !defined (OS_MACOSX)
  94   void RequestTextChecking(const base::string16& text,
  95                            blink::WebTextCheckingCompletion* completion);
  96 #endif
  97
  98   // Creates a list of WebTextCheckingResult objects (used by WebKit) from a
  99   // list of SpellCheckResult objects (used by Chrome). This function also
 100   // checks misspelled words returned by the Spelling service and changes the
 101   // underline colors of contextually-misspelled words.
 102   void CreateTextCheckingResults(
 103       ResultFilter filter,
 104       int line_offset,
 105       const base::string16& line_text,
 106       const std::vector<SpellCheckResult>& spellcheck_results,
 107       blink::WebVector<blink::WebTextCheckingResult>* textcheck_results);
 108
 109   bool is_spellcheck_enabled() { return spellcheck_enabled_; }
 110
 111  private:
 112    friend class SpellCheckTest;
 113    FRIEND_TEST_ALL_PREFIXES(SpellCheckTest, GetAutoCorrectionWord_EN_US);
 114    FRIEND_TEST_ALL_PREFIXES(SpellCheckTest,
 115        RequestSpellCheckMultipleTimesWithoutInitialization);
 116
 117   // RenderProcessObserver implementation:
 118    bool OnControlMessageReceived(const IPC::Message& message) override;
 119
 120   // Message handlers.
 121   void OnInit(IPC::PlatformFileForTransit bdict_file,
 122               const std::set<std::string>& custom_words,
 123               const std::string& language,
 124               bool auto_spell_correct);
 125   void OnCustomDictionaryChanged(
 126       const std::vector<std::string>& words_added,
 127       const std::vector<std::string>& words_removed);
 128   void OnEnableAutoSpellCorrect(bool enable);
 129   void OnEnableSpellCheck(bool enable);
 130
 131 #if !defined (OS_MACOSX)
 132   // Posts delayed spellcheck task and clear it if any.
 133   // Takes ownership of |request|.
 134   void PostDelayedSpellCheckTask(SpellcheckRequest* request);
 135
 136   // Performs spell checking from the request queue.
 137   void PerformSpellCheck(SpellcheckRequest* request);
 138
 139   // The parameters of a pending background-spellchecking request. When WebKit
 140   // sends a background-spellchecking request before initializing hunspell,
 141   // we save its parameters and start spellchecking after we finish initializing
 142   // hunspell. (When WebKit sends two or more requests, we cancel the previous
 143   // requests so we do not have to use vectors.)
 144   scoped_ptr<SpellcheckRequest> pending_request_param_;
 145 #endif
 146
 147   SpellcheckLanguage spellcheck_;  // Language-specific spellchecking code.
 148
 149   // Custom dictionary spelling engine.
 150   CustomDictionaryEngine custom_dictionary_;
 151
 152   // Remember state for auto spell correct.
 153   bool auto_spell_correct_turned_on_;
 154
 155   // Remember state for spellchecking.
 156   bool spellcheck_enabled_;
 157
 158   DISALLOW_COPY_AND_ASSIGN(SpellCheck);
 159 };
 160
 161 #endif  // CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_H_