components/translate/ios/browser/js_language_detection_manager.mm

   1 // Copyright 2013 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 #import "components/translate/ios/browser/js_language_detection_manager.h"
   6
   7 #include "base/callback.h"
   8 #include "base/mac/scoped_nsobject.h"
   9 #include "base/strings/string_util.h"
  10 #include "base/strings/sys_string_conversions.h"
  11
  12 namespace language_detection {
  13 // Note: This should stay in sync with the constant in language_detection.js.
  14 const size_t kMaxIndexChars = 65535;
  15 }  // namespace language_detection
  16
  17 @implementation JsLanguageDetectionManager
  18
  19 #pragma mark - Protected methods
  20
  21 - (NSString*)scriptPath {
  22   return @"language_detection";
  23 }
  24
  25 - (NSString*)presenceBeacon {
  26   return @"__gCrWeb.languageDetection";
  27 }
  28
  29 #pragma mark - Public methods
  30
  31 - (void)startLanguageDetection {
  32   [self evaluate:@"__gCrWeb.languageDetection.detectLanguage()"
  33       stringResultHandler:nil];
  34 }
  35
  36 - (void)retrieveBufferedTextContent:
  37         (const language_detection::BufferedTextCallback&)callback {
  38   DCHECK(!callback.is_null());
  39   // Copy the completion handler so that the block does not capture a reference.
  40   __block language_detection::BufferedTextCallback blockCallback = callback;
  41   [self evaluate:@"__gCrWeb.languageDetection.retrieveBufferedTextContent()"
  42       stringResultHandler:^(NSString* result, NSError*) {
  43         blockCallback.Run(base::SysNSStringToUTF16(result));
  44       }];
  45 }
  46
  47 @end