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.
5 // Integration with OS X native spellchecker.
7 #include "chrome/browser/spellchecker/spellcheck_platform_mac.h"
9 #import <Cocoa/Cocoa.h>
11 #include "base/bind.h"
12 #include "base/bind_helpers.h"
13 #include "base/logging.h"
14 #include "base/mac/foundation_util.h"
15 #include "base/mac/scoped_nsexception_enabler.h"
16 #include "base/metrics/histogram.h"
17 #include "base/strings/sys_string_conversions.h"
18 #include "base/time/time.h"
19 #include "chrome/common/spellcheck_common.h"
20 #include "chrome/common/spellcheck_messages.h"
21 #include "chrome/common/spellcheck_result.h"
22 #include "content/public/browser/browser_message_filter.h"
23 #include "content/public/browser/browser_thread.h"
25 using base::TimeTicks;
26 using content::BrowserMessageFilter;
27 using content::BrowserThread;
30 // The number of characters in the first part of the language code.
31 const unsigned int kShortLanguageCodeSize = 2;
33 // +[NSSpellChecker sharedSpellChecker] can throw exceptions depending
34 // on the state of the pasteboard, or possibly as a result of
35 // third-party code (when setting up services entries). The following
36 // receives nil if an exception is thrown, in which case
37 // spell-checking will not work, but it also will not crash the
39 NSSpellChecker* SharedSpellChecker() {
40 return base::mac::ObjCCastStrict<NSSpellChecker>(
41 base::mac::RunBlockIgnoringExceptions(^{
42 return [NSSpellChecker sharedSpellChecker];
46 // A private utility function to convert hunspell language codes to OS X
48 NSString* ConvertLanguageCodeToMac(const std::string& hunspell_lang_code) {
49 NSString* whole_code = base::SysUTF8ToNSString(hunspell_lang_code);
51 if ([whole_code length] > kShortLanguageCodeSize) {
52 NSString* lang_code = [whole_code
53 substringToIndex:kShortLanguageCodeSize];
54 // Add 1 here to skip the underscore.
55 NSString* region_code = [whole_code
56 substringFromIndex:(kShortLanguageCodeSize + 1)];
58 // Check for the special case of en-US and pt-PT, since OS X lists these
59 // as just en and pt respectively.
60 // TODO(pwicks): Find out if there are other special cases for languages
61 // not installed on the system by default. Are there others like pt-PT?
62 if (([lang_code isEqualToString:@"en"] &&
63 [region_code isEqualToString:@"US"]) ||
64 ([lang_code isEqualToString:@"pt"] &&
65 [region_code isEqualToString:@"PT"])) {
69 // Otherwise, just build a string that uses an underscore instead of a
70 // dash between the language and the region code, since this is the
71 // format that OS X uses.
72 NSString* os_x_language =
73 [NSString stringWithFormat:@"%@_%@", lang_code, region_code];
76 // Special case for Polish.
77 if ([whole_code isEqualToString:@"pl"]) {
80 // This is just a language code with the same format as OS X
86 std::string ConvertLanguageCodeFromMac(NSString* lang_code) {
87 // TODO(pwicks):figure out what to do about Multilingual
88 // Guards for strange cases.
89 if ([lang_code isEqualToString:@"en"]) return std::string("en-US");
90 if ([lang_code isEqualToString:@"pt"]) return std::string("pt-PT");
91 if ([lang_code isEqualToString:@"pl_PL"]) return std::string("pl");
93 if ([lang_code length] > kShortLanguageCodeSize &&
94 [lang_code characterAtIndex:kShortLanguageCodeSize] == '_') {
95 return base::SysNSStringToUTF8([NSString stringWithFormat:@"%@-%@",
96 [lang_code substringToIndex:kShortLanguageCodeSize],
97 [lang_code substringFromIndex:(kShortLanguageCodeSize + 1)]]);
99 return base::SysNSStringToUTF8(lang_code);
104 namespace spellcheck_mac {
106 void GetAvailableLanguages(std::vector<std::string>* spellcheck_languages) {
107 NSArray* availableLanguages = [SharedSpellChecker() availableLanguages];
108 for (NSString* lang_code in availableLanguages) {
109 spellcheck_languages->push_back(
110 ConvertLanguageCodeFromMac(lang_code));
114 bool SpellCheckerAvailable() {
115 // If this file was compiled, then we know that we are on OS X 10.5 at least
116 // and can safely return true here.
120 bool SpellCheckerProvidesPanel() {
121 // OS X has a Spelling Panel, so we can return true here.
125 bool SpellingPanelVisible() {
126 // This should only be called from the main thread.
127 DCHECK([NSThread currentThread] == [NSThread mainThread]);
128 return [[SharedSpellChecker() spellingPanel] isVisible];
131 void ShowSpellingPanel(bool show) {
133 [[SharedSpellChecker() spellingPanel]
134 performSelectorOnMainThread:@selector(makeKeyAndOrderFront:)
138 [[SharedSpellChecker() spellingPanel]
139 performSelectorOnMainThread:@selector(close)
145 void UpdateSpellingPanelWithMisspelledWord(const base::string16& word) {
146 NSString * word_to_display = base::SysUTF16ToNSString(word);
147 [SharedSpellChecker()
148 performSelectorOnMainThread:
149 @selector(updateSpellingPanelWithMisspelledWord:)
150 withObject:word_to_display
154 bool PlatformSupportsLanguage(const std::string& current_language) {
155 // First, convert the language to an OS X language code.
156 NSString* mac_lang_code = ConvertLanguageCodeToMac(current_language);
158 // Then grab the languages available.
159 NSArray* availableLanguages = [SharedSpellChecker() availableLanguages];
161 // Return true if the given language is supported by OS X.
162 return [availableLanguages containsObject:mac_lang_code];
165 void SetLanguage(const std::string& lang_to_set) {
166 // Do not set any language right now, since Chrome should honor the
167 // system spellcheck settings. (http://crbug.com/166046)
168 // Fix this once Chrome actually allows setting a spellcheck language
169 // in chrome://settings.
170 // NSString* NS_lang_to_set = ConvertLanguageCodeToMac(lang_to_set);
171 // [SharedSpellChecker() setLanguage:NS_lang_to_set];
174 static int last_seen_tag_;
176 bool CheckSpelling(const base::string16& word_to_check, int tag) {
177 last_seen_tag_ = tag;
179 // -[NSSpellChecker checkSpellingOfString] returns an NSRange that
180 // we can look at to determine if a word is misspelled.
181 NSRange spell_range = {0,0};
183 // Convert the word to an NSString.
184 NSString* NS_word_to_check = base::SysUTF16ToNSString(word_to_check);
185 // Check the spelling, starting at the beginning of the word.
186 spell_range = [SharedSpellChecker()
187 checkSpellingOfString:NS_word_to_check startingAt:0
188 language:nil wrap:NO inSpellDocumentWithTag:tag
191 // If the length of the misspelled word == 0,
192 // then there is no misspelled word.
193 bool word_correct = (spell_range.length == 0);
197 void FillSuggestionList(const base::string16& wrong_word,
198 std::vector<base::string16>* optional_suggestions) {
199 NSString* NS_wrong_word = base::SysUTF16ToNSString(wrong_word);
200 TimeTicks debug_begin_time = base::Histogram::DebugNow();
201 // The suggested words for |wrong_word|.
202 NSArray* guesses = [SharedSpellChecker() guessesForWord:NS_wrong_word];
203 DHISTOGRAM_TIMES("Spellcheck.SuggestTime",
204 base::Histogram::DebugNow() - debug_begin_time);
206 for (int i = 0; i < static_cast<int>([guesses count]); ++i) {
207 if (i < chrome::spellcheck_common::kMaxSuggestions) {
208 optional_suggestions->push_back(base::SysNSStringToUTF16(
209 [guesses objectAtIndex:i]));
214 void AddWord(const base::string16& word) {
215 NSString* word_to_add = base::SysUTF16ToNSString(word);
216 [SharedSpellChecker() learnWord:word_to_add];
219 void RemoveWord(const base::string16& word) {
220 NSString *word_to_remove = base::SysUTF16ToNSString(word);
221 [SharedSpellChecker() unlearnWord:word_to_remove];
224 int GetDocumentTag() {
225 NSInteger doc_tag = [NSSpellChecker uniqueSpellDocumentTag];
226 return static_cast<int>(doc_tag);
229 void IgnoreWord(const base::string16& word) {
230 [SharedSpellChecker() ignoreWord:base::SysUTF16ToNSString(word)
231 inSpellDocumentWithTag:last_seen_tag_];
234 void CloseDocumentWithTag(int tag) {
235 [SharedSpellChecker() closeSpellDocumentWithTag:static_cast<NSInteger>(tag)];
238 void RequestTextCheck(int document_tag,
239 const base::string16& text,
240 TextCheckCompleteCallback callback) {
241 NSString* text_to_check = base::SysUTF16ToNSString(text);
242 NSRange range_to_check = NSMakeRange(0, [text_to_check length]);
244 [SharedSpellChecker()
245 requestCheckingOfString:text_to_check
247 types:NSTextCheckingTypeSpelling
249 inSpellDocumentWithTag:document_tag
250 completionHandler:^(NSInteger,
254 std::vector<SpellCheckResult> check_results;
255 for (NSTextCheckingResult* result in results) {
256 // Deliberately ignore non-spelling results. OSX at the very least
257 // delivers a result of NSTextCheckingTypeOrthography for the
258 // whole fragment, which underlines the entire checked range.
259 if ([result resultType] != NSTextCheckingTypeSpelling)
262 // In this use case, the spell checker should never
263 // return anything but a single range per result.
264 check_results.push_back(SpellCheckResult(
265 SpellCheckResult::SPELLING,
266 [result range].location,
267 [result range].length));
269 // TODO(groby): Verify we don't need to post from here.
270 callback.Run(check_results);
274 class SpellcheckerStateInternal {
276 SpellcheckerStateInternal();
277 ~SpellcheckerStateInternal();
280 BOOL automaticallyIdentifiesLanguages_;
284 SpellcheckerStateInternal::SpellcheckerStateInternal() {
285 language_ = [SharedSpellChecker() language];
286 automaticallyIdentifiesLanguages_ =
287 [SharedSpellChecker() automaticallyIdentifiesLanguages];
288 [SharedSpellChecker() setLanguage:@"en"];
289 [SharedSpellChecker() setAutomaticallyIdentifiesLanguages:NO];
292 SpellcheckerStateInternal::~SpellcheckerStateInternal() {
293 [SharedSpellChecker() setLanguage:language_];
294 [SharedSpellChecker() setAutomaticallyIdentifiesLanguages:
295 automaticallyIdentifiesLanguages_];
298 ScopedEnglishLanguageForTest::ScopedEnglishLanguageForTest()
299 : state_(new SpellcheckerStateInternal) {
302 ScopedEnglishLanguageForTest::~ScopedEnglishLanguageForTest() {
306 } // namespace spellcheck_mac