chrome/renderer/spellchecker/spellcheck_provider.cc

   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 #include "chrome/renderer/spellchecker/spellcheck_provider.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/metrics/histogram.h"
   9 #include "chrome/common/chrome_switches.h"
  10 #include "chrome/common/spellcheck_marker.h"
  11 #include "chrome/common/spellcheck_messages.h"
  12 #include "chrome/common/spellcheck_result.h"
  13 #include "chrome/renderer/spellchecker/spellcheck.h"
  14 #include "chrome/renderer/spellchecker/spellcheck_language.h"
  15 #include "content/public/renderer/render_view.h"
  16 #include "third_party/WebKit/public/platform/WebVector.h"
  17 #include "third_party/WebKit/public/web/WebDocument.h"
  18 #include "third_party/WebKit/public/web/WebElement.h"
  19 #include "third_party/WebKit/public/web/WebFrame.h"
  20 #include "third_party/WebKit/public/web/WebTextCheckingCompletion.h"
  21 #include "third_party/WebKit/public/web/WebTextCheckingResult.h"
  22 #include "third_party/WebKit/public/web/WebTextDecorationType.h"
  23 #include "third_party/WebKit/public/web/WebView.h"
  24
  25 using blink::WebElement;
  26 using blink::WebFrame;
  27 using blink::WebString;
  28 using blink::WebTextCheckingCompletion;
  29 using blink::WebTextCheckingResult;
  30 using blink::WebTextDecorationType;
  31 using blink::WebVector;
  32
  33 static_assert(int(blink::WebTextDecorationTypeSpelling) ==
  34               int(SpellCheckResult::SPELLING), "mismatching enums");
  35 static_assert(int(blink::WebTextDecorationTypeGrammar) ==
  36               int(SpellCheckResult::GRAMMAR), "mismatching enums");
  37 static_assert(int(blink::WebTextDecorationTypeInvisibleSpellcheck) ==
  38               int(SpellCheckResult::INVISIBLE), "mismatching enums");
  39
  40 SpellCheckProvider::SpellCheckProvider(
  41     content::RenderView* render_view,
  42     SpellCheck* spellcheck)
  43     : content::RenderViewObserver(render_view),
  44       content::RenderViewObserverTracker<SpellCheckProvider>(render_view),
  45       spelling_panel_visible_(false),
  46       spellcheck_(spellcheck) {
  47   DCHECK(spellcheck_);
  48   if (render_view) {  // NULL in unit tests.
  49     render_view->GetWebView()->setSpellCheckClient(this);
  50     EnableSpellcheck(spellcheck_->IsSpellcheckEnabled());
  51   }
  52 }
  53
  54 SpellCheckProvider::~SpellCheckProvider() {
  55 }
  56
  57 void SpellCheckProvider::RequestTextChecking(
  58     const base::string16& text,
  59     WebTextCheckingCompletion* completion,
  60     const std::vector<SpellCheckMarker>& markers) {
  61   // Ignore invalid requests.
  62   if (text.empty() || !HasWordCharacters(text, 0)) {
  63     completion->didCancelCheckingText();
  64     return;
  65   }
  66
  67   // Try to satisfy check from cache.
  68   if (SatisfyRequestFromCache(text, completion))
  69     return;
  70
  71   // Send this text to a browser. A browser checks the user profile and send
  72   // this text to the Spelling service only if a user enables this feature.
  73   last_request_.clear();
  74   last_results_.assign(blink::WebVector<blink::WebTextCheckingResult>());
  75
  76 #if defined(USE_BROWSER_SPELLCHECKER)
  77   // Text check (unified request for grammar and spell check) is only
  78   // available for browser process, so we ask the system spellchecker
  79   // over IPC or return an empty result if the checker is not
  80   // available.
  81   Send(new SpellCheckHostMsg_RequestTextCheck(
  82       routing_id(),
  83       text_check_completions_.Add(completion),
  84       text,
  85       markers));
  86 #else
  87   Send(new SpellCheckHostMsg_CallSpellingService(
  88       routing_id(),
  89       text_check_completions_.Add(completion),
  90       base::string16(text),
  91       markers));
  92 #endif  // !USE_BROWSER_SPELLCHECKER
  93 }
  94
  95 bool SpellCheckProvider::OnMessageReceived(const IPC::Message& message) {
  96   bool handled = true;
  97   IPC_BEGIN_MESSAGE_MAP(SpellCheckProvider, message)
  98 #if !defined(USE_BROWSER_SPELLCHECKER)
  99     IPC_MESSAGE_HANDLER(SpellCheckMsg_RespondSpellingService,
 100                         OnRespondSpellingService)
 101 #endif
 102 #if defined(USE_BROWSER_SPELLCHECKER)
 103     IPC_MESSAGE_HANDLER(SpellCheckMsg_AdvanceToNextMisspelling,
 104                         OnAdvanceToNextMisspelling)
 105     IPC_MESSAGE_HANDLER(SpellCheckMsg_RespondTextCheck, OnRespondTextCheck)
 106     IPC_MESSAGE_HANDLER(SpellCheckMsg_ToggleSpellPanel, OnToggleSpellPanel)
 107 #endif
 108     IPC_MESSAGE_UNHANDLED(handled = false)
 109   IPC_END_MESSAGE_MAP()
 110   return handled;
 111 }
 112
 113 void SpellCheckProvider::FocusedNodeChanged(const blink::WebNode& unused) {
 114 #if defined(USE_BROWSER_SPELLCHECKER)
 115   WebFrame* frame = render_view()->GetWebView()->focusedFrame();
 116   WebElement element = frame->document().isNull() ? WebElement() :
 117       frame->document().focusedElement();
 118   bool enabled = !element.isNull() && render_view()->IsEditableNode(element);
 119
 120   bool checked = enabled && render_view()->GetWebView() &&
 121       frame->isContinuousSpellCheckingEnabled();
 122
 123   Send(new SpellCheckHostMsg_ToggleSpellCheck(routing_id(), enabled, checked));
 124 #endif  // USE_BROWSER_SPELLCHECKER
 125 }
 126
 127 void SpellCheckProvider::spellCheck(
 128     const WebString& text,
 129     int& offset,
 130     int& length,
 131     WebVector<WebString>* optional_suggestions) {
 132   base::string16 word(text);
 133   std::vector<base::string16> suggestions;
 134   const int kWordStart = 0;
 135   spellcheck_->SpellCheckWord(
 136       word.c_str(), kWordStart, word.size(), routing_id(),
 137       &offset, &length, optional_suggestions ? & suggestions : NULL);
 138   if (optional_suggestions) {
 139     *optional_suggestions = suggestions;
 140     UMA_HISTOGRAM_COUNTS("SpellCheck.api.check.suggestions", word.size());
 141   } else {
 142     UMA_HISTOGRAM_COUNTS("SpellCheck.api.check", word.size());
 143     // If optional_suggestions is not requested, the API is called
 144     // for marking.  So we use this for counting markable words.
 145     Send(new SpellCheckHostMsg_NotifyChecked(routing_id(), word, 0 < length));
 146   }
 147 }
 148
 149 void SpellCheckProvider::checkTextOfParagraph(
 150     const blink::WebString& text,
 151     blink::WebTextCheckingTypeMask mask,
 152     blink::WebVector<blink::WebTextCheckingResult>* results) {
 153   if (!results)
 154     return;
 155
 156   if (!(mask & blink::WebTextCheckingTypeSpelling))
 157     return;
 158
 159   // TODO(groby): As far as I can tell, this method is never invoked.
 160   // UMA results seem to support that. Investigate, clean up if true.
 161   NOTREACHED();
 162   spellcheck_->SpellCheckParagraph(text, results);
 163   UMA_HISTOGRAM_COUNTS("SpellCheck.api.paragraph", text.length());
 164 }
 165
 166 void SpellCheckProvider::requestCheckingOfText(
 167     const WebString& text,
 168     const WebVector<uint32>& markers,
 169     const WebVector<unsigned>& marker_offsets,
 170     WebTextCheckingCompletion* completion) {
 171   std::vector<SpellCheckMarker> spellcheck_markers;
 172   for (size_t i = 0; i < markers.size(); ++i) {
 173     spellcheck_markers.push_back(
 174         SpellCheckMarker(markers[i], marker_offsets[i]));
 175   }
 176   RequestTextChecking(text, completion, spellcheck_markers);
 177   UMA_HISTOGRAM_COUNTS("SpellCheck.api.async", text.length());
 178 }
 179
 180 WebString SpellCheckProvider::autoCorrectWord(const WebString& word) {
 181   const base::CommandLine& command_line =
 182       *base::CommandLine::ForCurrentProcess();
 183   if (command_line.HasSwitch(switches::kEnableSpellingAutoCorrect)) {
 184     UMA_HISTOGRAM_COUNTS("SpellCheck.api.autocorrect", word.length());
 185     return spellcheck_->GetAutoCorrectionWord(word, routing_id());
 186   }
 187   return base::string16();
 188 }
 189
 190 void SpellCheckProvider::showSpellingUI(bool show) {
 191 #if defined(USE_BROWSER_SPELLCHECKER)
 192   UMA_HISTOGRAM_BOOLEAN("SpellCheck.api.showUI", show);
 193   Send(new SpellCheckHostMsg_ShowSpellingPanel(routing_id(), show));
 194 #endif
 195 }
 196
 197 bool SpellCheckProvider::isShowingSpellingUI() {
 198   return spelling_panel_visible_;
 199 }
 200
 201 void SpellCheckProvider::updateSpellingUIWithMisspelledWord(
 202     const WebString& word) {
 203 #if defined(USE_BROWSER_SPELLCHECKER)
 204   Send(new SpellCheckHostMsg_UpdateSpellingPanelWithMisspelledWord(routing_id(),
 205                                                                    word));
 206 #endif
 207 }
 208
 209 #if !defined(USE_BROWSER_SPELLCHECKER)
 210 void SpellCheckProvider::OnRespondSpellingService(
 211     int identifier,
 212     bool succeeded,
 213     const base::string16& line,
 214     const std::vector<SpellCheckResult>& results) {
 215   WebTextCheckingCompletion* completion =
 216       text_check_completions_.Lookup(identifier);
 217   if (!completion)
 218     return;
 219   text_check_completions_.Remove(identifier);
 220
 221   // If |succeeded| is false, we use local spellcheck as a fallback.
 222   if (!succeeded) {
 223     spellcheck_->RequestTextChecking(line, completion);
 224     return;
 225   }
 226
 227   // Double-check the returned spellchecking results with our spellchecker to
 228   // visualize the differences between ours and the on-line spellchecker.
 229   blink::WebVector<blink::WebTextCheckingResult> textcheck_results;
 230   spellcheck_->CreateTextCheckingResults(SpellCheck::USE_NATIVE_CHECKER,
 231                                          0,
 232                                          line,
 233                                          results,
 234                                          &textcheck_results);
 235   completion->didFinishCheckingText(textcheck_results);
 236
 237   // Cache the request and the converted results.
 238   last_request_ = line;
 239   last_results_.swap(textcheck_results);
 240 }
 241 #endif
 242
 243 bool SpellCheckProvider::HasWordCharacters(
 244     const base::string16& text,
 245     int index) const {
 246   const base::char16* data = text.data();
 247   int length = text.length();
 248   while (index < length) {
 249     uint32 code = 0;
 250     U16_NEXT(data, index, length, code);
 251     UErrorCode error = U_ZERO_ERROR;
 252     if (uscript_getScript(code, &error) != USCRIPT_COMMON)
 253       return true;
 254   }
 255   return false;
 256 }
 257
 258 #if defined(USE_BROWSER_SPELLCHECKER)
 259 void SpellCheckProvider::OnAdvanceToNextMisspelling() {
 260   if (!render_view()->GetWebView())
 261     return;
 262   render_view()->GetWebView()->focusedFrame()->executeCommand(
 263       WebString::fromUTF8("AdvanceToNextMisspelling"));
 264 }
 265
 266 void SpellCheckProvider::OnRespondTextCheck(
 267     int identifier,
 268     const base::string16& line,
 269     const std::vector<SpellCheckResult>& results) {
 270   // TODO(groby): Unify with SpellCheckProvider::OnRespondSpellingService
 271   DCHECK(spellcheck_);
 272   WebTextCheckingCompletion* completion =
 273       text_check_completions_.Lookup(identifier);
 274   if (!completion)
 275     return;
 276   text_check_completions_.Remove(identifier);
 277   blink::WebVector<blink::WebTextCheckingResult> textcheck_results;
 278   spellcheck_->CreateTextCheckingResults(SpellCheck::DO_NOT_MODIFY,
 279                                          0,
 280                                          line,
 281                                          results,
 282                                          &textcheck_results);
 283   completion->didFinishCheckingText(textcheck_results);
 284
 285   // TODO(groby): Add request caching once OSX reports back original request.
 286   // (cf. SpellCheckProvider::OnRespondSpellingService)
 287   // Cache the request and the converted results.
 288 }
 289
 290 void SpellCheckProvider::OnToggleSpellPanel(bool is_currently_visible) {
 291   if (!render_view()->GetWebView())
 292     return;
 293   // We need to tell the webView whether the spelling panel is visible or not so
 294   // that it won't need to make ipc calls later.
 295   spelling_panel_visible_ = is_currently_visible;
 296   render_view()->GetWebView()->focusedFrame()->executeCommand(
 297       WebString::fromUTF8("ToggleSpellPanel"));
 298 }
 299 #endif
 300
 301 void SpellCheckProvider::EnableSpellcheck(bool enable) {
 302   if (!render_view()->GetWebView())
 303     return;
 304
 305   WebFrame* frame = render_view()->GetWebView()->focusedFrame();
 306   frame->enableContinuousSpellChecking(enable);
 307   if (!enable)
 308     frame->removeSpellingMarkers();
 309 }
 310
 311 bool SpellCheckProvider::SatisfyRequestFromCache(
 312     const base::string16& text,
 313     WebTextCheckingCompletion* completion) {
 314   size_t last_length = last_request_.length();
 315
 316   // Send back the |last_results_| if the |last_request_| is a substring of
 317   // |text| and |text| does not have more words to check. Provider cannot cancel
 318   // the spellcheck request here, because WebKit might have discarded the
 319   // previous spellcheck results and erased the spelling markers in response to
 320   // the user editing the text.
 321   base::string16 request(text);
 322   size_t text_length = request.length();
 323   if (text_length >= last_length &&
 324       !request.compare(0, last_length, last_request_)) {
 325     if (text_length == last_length || !HasWordCharacters(text, last_length)) {
 326       completion->didFinishCheckingText(last_results_);
 327       return true;
 328     }
 329     int code = 0;
 330     int length = static_cast<int>(text_length);
 331     U16_PREV(text.data(), 0, length, code);
 332     UErrorCode error = U_ZERO_ERROR;
 333     if (uscript_getScript(code, &error) != USCRIPT_COMMON) {
 334       completion->didCancelCheckingText();
 335       return true;
 336     }
 337   }
 338   // Create a subset of the cached results and return it if the given text is a
 339   // substring of the cached text.
 340   if (text_length < last_length &&
 341       !last_request_.compare(0, text_length, request)) {
 342     size_t result_size = 0;
 343     for (size_t i = 0; i < last_results_.size(); ++i) {
 344       size_t start = last_results_[i].location;
 345       size_t end = start + last_results_[i].length;
 346       if (start <= text_length && end <= text_length)
 347         ++result_size;
 348     }
 349     if (result_size > 0) {
 350       blink::WebVector<blink::WebTextCheckingResult> results(result_size);
 351       for (size_t i = 0; i < result_size; ++i) {
 352         results[i].decoration = last_results_[i].decoration;
 353         results[i].location = last_results_[i].location;
 354         results[i].length = last_results_[i].length;
 355         results[i].replacement = last_results_[i].replacement;
 356       }
 357       completion->didFinishCheckingText(results);
 358       return true;
 359     }
 360   }
 361
 362   return false;
 363 }