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spellcheck.cc
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// Copyright (c) 2012 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.
#include "chrome/renderer/spellchecker/spellcheck.h"
#include <algorithm>
#include "base/basictypes.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/single_thread_task_runner.h"
#include "base/sys_info.h"
#include "base/thread_task_runner_handle.h"
#include "chrome/common/channel_info.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/spellcheck_common.h"
#include "chrome/common/spellcheck_messages.h"
#include "chrome/common/spellcheck_result.h"
#include "chrome/renderer/spellchecker/spellcheck_language.h"
#include "chrome/renderer/spellchecker/spellcheck_provider.h"
#include "components/version_info/version_info.h"
#include "content/public/renderer/render_thread.h"
#include "content/public/renderer/render_view.h"
#include "content/public/renderer/render_view_visitor.h"
#include "ipc/ipc_platform_file.h"
#include "third_party/WebKit/public/platform/WebString.h"
#include "third_party/WebKit/public/platform/WebVector.h"
#include "third_party/WebKit/public/web/WebTextCheckingCompletion.h"
#include "third_party/WebKit/public/web/WebTextCheckingResult.h"
#include "third_party/WebKit/public/web/WebTextDecorationType.h"
#include "third_party/WebKit/public/web/WebView.h"
using blink::WebVector;
using blink::WebString;
using blink::WebTextCheckingResult;
using blink::WebTextDecorationType;
namespace {
const int kNoOffset = 0;
const int kNoTag = 0;
class UpdateSpellcheckEnabled : public content::RenderViewVisitor {
public:
explicit UpdateSpellcheckEnabled(bool enabled) : enabled_(enabled) {}
bool Visit(content::RenderView* render_view) override;
private:
bool enabled_; // New spellcheck-enabled state.
DISALLOW_COPY_AND_ASSIGN(UpdateSpellcheckEnabled);
};
bool UpdateSpellcheckEnabled::Visit(content::RenderView* render_view) {
SpellCheckProvider* provider = SpellCheckProvider::Get(render_view);
DCHECK(provider);
provider->EnableSpellcheck(enabled_);
return true;
}
class DocumentMarkersCollector : public content::RenderViewVisitor {
public:
DocumentMarkersCollector() {}
~DocumentMarkersCollector() override {}
const std::vector<uint32>& markers() const { return markers_; }
bool Visit(content::RenderView* render_view) override;
private:
std::vector<uint32> markers_;
DISALLOW_COPY_AND_ASSIGN(DocumentMarkersCollector);
};
bool DocumentMarkersCollector::Visit(content::RenderView* render_view) {
if (!render_view || !render_view->GetWebView())
return true;
WebVector<uint32> markers;
render_view->GetWebView()->spellingMarkers(&markers);
for (size_t i = 0; i < markers.size(); ++i)
markers_.push_back(markers[i]);
// Visit all render views.
return true;
}
class DocumentMarkersRemover : public content::RenderViewVisitor {
public:
explicit DocumentMarkersRemover(const std::set<std::string>& words);
~DocumentMarkersRemover() override {}
bool Visit(content::RenderView* render_view) override;
private:
WebVector<WebString> words_;
DISALLOW_COPY_AND_ASSIGN(DocumentMarkersRemover);
};
DocumentMarkersRemover::DocumentMarkersRemover(
const std::set<std::string>& words)
: words_(words.size()) {
std::transform(words.begin(), words.end(), words_.begin(),
[](const std::string& w) { return WebString::fromUTF8(w); });
}
bool DocumentMarkersRemover::Visit(content::RenderView* render_view) {
if (render_view && render_view->GetWebView())
render_view->GetWebView()->removeSpellingMarkersUnderWords(words_);
return true;
}
bool IsApostrophe(base::char16 c) {
const base::char16 kApostrophe = 0x27;
const base::char16 kRightSingleQuotationMark = 0x2019;
return c == kApostrophe || c == kRightSingleQuotationMark;
}
// Makes sure that the apostrophes in the |spelling_suggestion| are the same
// type as in the |misspelled_word| and in the same order. Ignore differences in
// the number of apostrophes.
void PreserveOriginalApostropheTypes(const base::string16& misspelled_word,
base::string16* spelling_suggestion) {
auto it = spelling_suggestion->begin();
for (const base::char16& c : misspelled_word) {
if (IsApostrophe(c)) {
it = std::find_if(it, spelling_suggestion->end(), IsApostrophe);
if (it == spelling_suggestion->end())
return;
*it++ = c;
}
}
}
} // namespace
class SpellCheck::SpellcheckRequest {
public:
SpellcheckRequest(const base::string16& text,
blink::WebTextCheckingCompletion* completion)
: text_(text), completion_(completion) {
DCHECK(completion);
}
~SpellcheckRequest() {}
base::string16 text() { return text_; }
blink::WebTextCheckingCompletion* completion() { return completion_; }
private:
base::string16 text_; // Text to be checked in this task.
// The interface to send the misspelled ranges to WebKit.
blink::WebTextCheckingCompletion* completion_;
DISALLOW_COPY_AND_ASSIGN(SpellcheckRequest);
};
// Initializes SpellCheck object.
// spellcheck_enabled_ currently MUST be set to true, due to peculiarities of
// the initialization sequence.
// Since it defaults to true, newly created SpellCheckProviders will enable
// spellchecking. After the first word is typed, the provider requests a check,
// which in turn triggers the delayed initialization sequence in SpellCheck.
// This does send a message to the browser side, which triggers the creation
// of the SpellcheckService. That does create the observer for the preference
// responsible for enabling/disabling checking, which allows subsequent changes
// to that preference to be sent to all SpellCheckProviders.
// Setting |spellcheck_enabled_| to false by default prevents that mechanism,
// and as such the SpellCheckProviders will never be notified of different
// values.
// TODO(groby): Simplify this.
SpellCheck::SpellCheck()
: auto_spell_correct_turned_on_(false),
spellcheck_enabled_(true) {
}
SpellCheck::~SpellCheck() {
}
void SpellCheck::FillSuggestions(
const std::vector<std::vector<base::string16>>& suggestions_list,
std::vector<base::string16>* optional_suggestions) {
DCHECK(optional_suggestions);
size_t num_languages = suggestions_list.size();
// Compute maximum number of suggestions in a single language.
size_t max_suggestions = 0;
for (const auto& suggestions : suggestions_list)
max_suggestions = std::max(max_suggestions, suggestions.size());
for (size_t count = 0; count < (max_suggestions * num_languages); ++count) {
size_t language = count % num_languages;
size_t index = count / num_languages;
if (suggestions_list[language].size() <= index)
continue;
const base::string16& suggestion = suggestions_list[language][index];
// Only add the suggestion if it's unique.
if (std::find(optional_suggestions->begin(), optional_suggestions->end(),
suggestion) == optional_suggestions->end()) {
optional_suggestions->push_back(suggestion);
}
if (optional_suggestions->size() >=
chrome::spellcheck_common::kMaxSuggestions) {
break;
}
}
}
bool SpellCheck::OnControlMessageReceived(const IPC::Message& message) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(SpellCheck, message)
IPC_MESSAGE_HANDLER(SpellCheckMsg_Init, OnInit)
IPC_MESSAGE_HANDLER(SpellCheckMsg_CustomDictionaryChanged,
OnCustomDictionaryChanged)
IPC_MESSAGE_HANDLER(SpellCheckMsg_EnableAutoSpellCorrect,
OnEnableAutoSpellCorrect)
IPC_MESSAGE_HANDLER(SpellCheckMsg_EnableSpellCheck, OnEnableSpellCheck)
IPC_MESSAGE_HANDLER(SpellCheckMsg_RequestDocumentMarkers,
OnRequestDocumentMarkers)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
void SpellCheck::OnInit(
const std::vector<SpellCheckBDictLanguage>& bdict_languages,
const std::set<std::string>& custom_words,
bool auto_spell_correct) {
languages_.clear();
for (const auto& bdict_language : bdict_languages) {
AddSpellcheckLanguage(
IPC::PlatformFileForTransitToFile(bdict_language.file),
bdict_language.language);
}
custom_dictionary_.Init(custom_words);
auto_spell_correct_turned_on_ = auto_spell_correct;
#if !defined(USE_BROWSER_SPELLCHECKER)
PostDelayedSpellCheckTask(pending_request_param_.release());
#endif
}
void SpellCheck::OnCustomDictionaryChanged(
const std::set<std::string>& words_added,
const std::set<std::string>& words_removed) {
custom_dictionary_.OnCustomDictionaryChanged(words_added, words_removed);
if (words_added.empty())
return;
DocumentMarkersRemover markersRemover(words_added);
content::RenderView::ForEach(&markersRemover);
}
void SpellCheck::OnEnableAutoSpellCorrect(bool enable) {
auto_spell_correct_turned_on_ = enable;
}
void SpellCheck::OnEnableSpellCheck(bool enable) {
spellcheck_enabled_ = enable;
UpdateSpellcheckEnabled updater(enable);
content::RenderView::ForEach(&updater);
}
void SpellCheck::OnRequestDocumentMarkers() {
DocumentMarkersCollector collector;
content::RenderView::ForEach(&collector);
content::RenderThread::Get()->Send(
new SpellCheckHostMsg_RespondDocumentMarkers(collector.markers()));
}
// TODO(groby): Make sure we always have a spelling engine, even before
// AddSpellcheckLanguage() is called.
void SpellCheck::AddSpellcheckLanguage(base::File file,
const std::string& language) {
languages_.push_back(new SpellcheckLanguage());
languages_.back()->Init(file.Pass(), language);
}
bool SpellCheck::SpellCheckWord(
const base::char16* text_begin,
int position_in_text,
int text_length,
int tag,
int* misspelling_start,
int* misspelling_len,
std::vector<base::string16>* optional_suggestions) {
DCHECK(text_length >= position_in_text);
DCHECK(misspelling_start && misspelling_len) << "Out vars must be given.";
// Do nothing if we need to delay initialization. (Rather than blocking,
// report the word as correctly spelled.)
if (InitializeIfNeeded())
return true;
// These are for holding misspelling or skippable word positions and lengths
// between calls to SpellcheckLanguage::SpellCheckWord.
int possible_misspelling_start;
int possible_misspelling_len;
// The longest sequence of text that all languages agree is skippable.
int agreed_skippable_len;
// A vector of vectors containing spelling suggestions from different
// languages.
std::vector<std::vector<base::string16>> suggestions_list;
// A vector to hold a language's misspelling suggestions between spellcheck
// calls.
std::vector<base::string16> language_suggestions;
// This loop only advances if all languages agree that a sequence of text is
// skippable.
for (; position_in_text <= text_length;
position_in_text += agreed_skippable_len) {
// Reseting |agreed_skippable_len| to the worst-case length each time
// prevents some unnecessary iterations.
agreed_skippable_len = text_length;
*misspelling_start = 0;
*misspelling_len = 0;
suggestions_list.clear();
for (ScopedVector<SpellcheckLanguage>::iterator language =
languages_.begin();
language != languages_.end();) {
language_suggestions.clear();
SpellcheckLanguage::SpellcheckWordResult result =
(*language)->SpellCheckWord(
text_begin, position_in_text, text_length, tag,
&possible_misspelling_start, &possible_misspelling_len,
optional_suggestions ? &language_suggestions : nullptr);
switch (result) {
case SpellcheckLanguage::SpellcheckWordResult::IS_CORRECT:
*misspelling_start = 0;
*misspelling_len = 0;
return true;
case SpellcheckLanguage::SpellcheckWordResult::IS_SKIPPABLE:
agreed_skippable_len =
std::min(agreed_skippable_len, possible_misspelling_len);
// If true, this means the spellchecker moved past a word that was
// previously determined to be misspelled or skippable, which means
// another spellcheck language marked it as correct.
if (position_in_text != possible_misspelling_start) {
*misspelling_len = 0;
position_in_text = possible_misspelling_start;
suggestions_list.clear();
language = languages_.begin();
} else {
language++;
}
break;
case SpellcheckLanguage::SpellcheckWordResult::IS_MISSPELLED:
*misspelling_start = possible_misspelling_start;
*misspelling_len = possible_misspelling_len;
// If true, this means the spellchecker moved past a word that was
// previously determined to be misspelled or skippable, which means
// another spellcheck language marked it as correct.
if (position_in_text != *misspelling_start) {
suggestions_list.clear();
language = languages_.begin();
position_in_text = *misspelling_start;
} else {
suggestions_list.push_back(language_suggestions);
language++;
}
break;
}
}
// If |*misspelling_len| is non-zero, that means at least one language
// marked a word misspelled and no other language considered it correct.
if (*misspelling_len != 0) {
if (optional_suggestions)
FillSuggestions(suggestions_list, optional_suggestions);
return false;
}
}
NOTREACHED();
return true;
}
bool SpellCheck::SpellCheckParagraph(
const base::string16& text,
WebVector<WebTextCheckingResult>* results) {
#if !defined(USE_BROWSER_SPELLCHECKER)
// Mac and Android have their own spell checkers,so this method won't be used
DCHECK(results);
std::vector<WebTextCheckingResult> textcheck_results;
size_t length = text.length();
size_t position_in_text = 0;
// Spellcheck::SpellCheckWord() automatically breaks text into words and
// checks the spellings of the extracted words. This function sets the
// position and length of the first misspelled word and returns false when
// the text includes misspelled words. Therefore, we just repeat calling the
// function until it returns true to check the whole text.
int misspelling_start = 0;
int misspelling_length = 0;
while (position_in_text <= length) {
if (SpellCheckWord(text.c_str(),
position_in_text,
length,
kNoTag,
&misspelling_start,
&misspelling_length,
NULL)) {
results->assign(textcheck_results);
return true;
}
if (!custom_dictionary_.SpellCheckWord(
text, misspelling_start, misspelling_length)) {
base::string16 replacement;
textcheck_results.push_back(WebTextCheckingResult(
blink::WebTextDecorationTypeSpelling,
misspelling_start,
misspelling_length,
replacement));
}
position_in_text = misspelling_start + misspelling_length;
}
results->assign(textcheck_results);
return false;
#else
// This function is only invoked for spell checker functionality that runs
// on the render thread. OSX and Android builds don't have that.
NOTREACHED();
return true;
#endif
}
base::string16 SpellCheck::GetAutoCorrectionWord(const base::string16& word,
int tag) {
base::string16 autocorrect_word;
if (!auto_spell_correct_turned_on_)
return autocorrect_word; // Return the empty string.
int word_length = static_cast<int>(word.size());
if (word_length < 2 ||
word_length > chrome::spellcheck_common::kMaxAutoCorrectWordSize)
return autocorrect_word;
if (InitializeIfNeeded())
return autocorrect_word;
base::char16 misspelled_word[
chrome::spellcheck_common::kMaxAutoCorrectWordSize + 1];
const base::char16* word_char = word.c_str();
for (int i = 0; i <= chrome::spellcheck_common::kMaxAutoCorrectWordSize;
++i) {
if (i >= word_length)
misspelled_word[i] = 0;
else
misspelled_word[i] = word_char[i];
}
// Swap adjacent characters and spellcheck.
int misspelling_start, misspelling_len;
for (int i = 0; i < word_length - 1; i++) {
// Swap.
std::swap(misspelled_word[i], misspelled_word[i + 1]);
// Check spelling.
misspelling_start = misspelling_len = 0;
SpellCheckWord(misspelled_word, kNoOffset, word_length, tag,
&misspelling_start, &misspelling_len, NULL);
// Make decision: if only one swap produced a valid word, then we want to
// return it. If we found two or more, we don't do autocorrection.
if (misspelling_len == 0) {
if (autocorrect_word.empty()) {
autocorrect_word.assign(misspelled_word);
} else {
autocorrect_word.clear();
break;
}
}
// Restore the swapped characters.
std::swap(misspelled_word[i], misspelled_word[i + 1]);
}
return autocorrect_word;
}
// OSX and Android use their own spell checkers
#if !defined(USE_BROWSER_SPELLCHECKER)
void SpellCheck::RequestTextChecking(
const base::string16& text,
blink::WebTextCheckingCompletion* completion) {
// Clean up the previous request before starting a new request.
if (pending_request_param_.get())
pending_request_param_->completion()->didCancelCheckingText();
pending_request_param_.reset(new SpellcheckRequest(
text, completion));
// We will check this text after we finish loading the hunspell dictionary.
if (InitializeIfNeeded())
return;
PostDelayedSpellCheckTask(pending_request_param_.release());
}
#endif
bool SpellCheck::InitializeIfNeeded() {
if (languages_.empty())
return true;
bool initialize_if_needed = false;
for (SpellcheckLanguage* language : languages_)
initialize_if_needed |= language->InitializeIfNeeded();
return initialize_if_needed;
}
// OSX and Android don't have |pending_request_param_|
#if !defined(USE_BROWSER_SPELLCHECKER)
void SpellCheck::PostDelayedSpellCheckTask(SpellcheckRequest* request) {
if (!request)
return;
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::Bind(&SpellCheck::PerformSpellCheck, AsWeakPtr(),
base::Owned(request)));
}
#endif
// Mac and Android use their platform engines instead.
#if !defined(USE_BROWSER_SPELLCHECKER)
void SpellCheck::PerformSpellCheck(SpellcheckRequest* param) {
DCHECK(param);
if (languages_.empty() ||
std::find_if(languages_.begin(), languages_.end(),
[](SpellcheckLanguage* language) {
return !language->IsEnabled();
}) != languages_.end()) {
param->completion()->didCancelCheckingText();
} else {
WebVector<blink::WebTextCheckingResult> results;
SpellCheckParagraph(param->text(), &results);
param->completion()->didFinishCheckingText(results);
}
}
#endif
void SpellCheck::CreateTextCheckingResults(
ResultFilter filter,
int line_offset,
const base::string16& line_text,
const std::vector<SpellCheckResult>& spellcheck_results,
WebVector<WebTextCheckingResult>* textcheck_results) {
DCHECK(!line_text.empty());
std::vector<WebTextCheckingResult> results;
for (const SpellCheckResult& spellcheck_result : spellcheck_results) {
DCHECK_LE(static_cast<size_t>(spellcheck_result.location),
line_text.length());
DCHECK_LE(static_cast<size_t>(spellcheck_result.location +
spellcheck_result.length),
line_text.length());
const base::string16& misspelled_word =
line_text.substr(spellcheck_result.location, spellcheck_result.length);
base::string16 replacement = spellcheck_result.replacement;
SpellCheckResult::Decoration decoration = spellcheck_result.decoration;
// Ignore words in custom dictionary.
if (custom_dictionary_.SpellCheckWord(misspelled_word, 0,
misspelled_word.length())) {
continue;
}
// Use the same types of appostrophes as in the mispelled word.
PreserveOriginalApostropheTypes(misspelled_word, &replacement);
// Ignore misspellings due the typographical apostrophe.
if (misspelled_word == replacement)
continue;
if (filter == USE_NATIVE_CHECKER) {
// Double-check misspelled words with out spellchecker and attach grammar
// markers to them if our spellchecker tells us they are correct words,
// i.e. they are probably contextually-misspelled words.
int unused_misspelling_start = 0;
int unused_misspelling_length = 0;
if (decoration == SpellCheckResult::SPELLING &&
SpellCheckWord(misspelled_word.c_str(), kNoOffset,
misspelled_word.length(), kNoTag,
&unused_misspelling_start, &unused_misspelling_length,
nullptr)) {
decoration = SpellCheckResult::GRAMMAR;
}
}
results.push_back(WebTextCheckingResult(
static_cast<WebTextDecorationType>(decoration),
line_offset + spellcheck_result.location, spellcheck_result.length,
replacement, spellcheck_result.hash));
}
textcheck_results->assign(results);
}
bool SpellCheck::IsSpellcheckEnabled() {
#if defined(OS_ANDROID)
if (base::SysInfo::IsLowEndDevice())
return false;
version_info::Channel channel = chrome::GetChannel();
if (channel == version_info::Channel::DEV ||
channel == version_info::Channel::CANARY) {
return true;
} else if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableAndroidSpellChecker)) {
return false;
}
#endif
return spellcheck_enabled_;
}