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      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 #include "chromeos/ime/extension_ime_util.h"
      6 
      7 #include "base/strings/string_util.h"
      8 
      9 namespace chromeos {
     10 namespace {
     11 const char kExtensionIMEPrefix[] = "_ext_ime_";
     12 const int kExtensionIMEPrefixLength =
     13     sizeof(kExtensionIMEPrefix) / sizeof(kExtensionIMEPrefix[0]) - 1;
     14 const char kComponentExtensionIMEPrefix[] = "_comp_ime_";
     15 const int kComponentExtensionIMEPrefixLength =
     16     sizeof(kComponentExtensionIMEPrefix) /
     17         sizeof(kComponentExtensionIMEPrefix[0]) - 1;
     18 const int kExtensionIdLength = 32;
     19 }  // namespace
     20 
     21 namespace extension_ime_util {
     22 std::string GetInputMethodID(const std::string& extension_id,
     23                              const std::string& engine_id) {
     24   DCHECK(!extension_id.empty());
     25   DCHECK(!engine_id.empty());
     26   return kExtensionIMEPrefix + extension_id + engine_id;
     27 }
     28 
     29 std::string GetComponentInputMethodID(const std::string& extension_id,
     30                                       const std::string& engine_id) {
     31   DCHECK(!extension_id.empty());
     32   DCHECK(!engine_id.empty());
     33   return kComponentExtensionIMEPrefix + extension_id + engine_id;
     34 }
     35 
     36 std::string GetExtensionIDFromInputMethodID(
     37     const std::string& input_method_id) {
     38   if (IsExtensionIME(input_method_id) &&
     39       input_method_id.size() >= kExtensionIMEPrefixLength +
     40                                 kExtensionIdLength) {
     41     return input_method_id.substr(kExtensionIMEPrefixLength,
     42                                   kExtensionIdLength);
     43   }
     44   if (IsComponentExtensionIME(input_method_id) &&
     45       input_method_id.size() >= kComponentExtensionIMEPrefixLength +
     46                                 kExtensionIdLength) {
     47     return input_method_id.substr(kComponentExtensionIMEPrefixLength,
     48                                   kExtensionIdLength);
     49   }
     50   return "";
     51 }
     52 
     53 bool IsExtensionIME(const std::string& input_method_id) {
     54   return StartsWithASCII(input_method_id,
     55                          kExtensionIMEPrefix,
     56                          true);  // Case sensitive.
     57 }
     58 
     59 bool IsComponentExtensionIME(const std::string& input_method_id) {
     60   return StartsWithASCII(input_method_id,
     61                          kComponentExtensionIMEPrefix,
     62                          true);  // Case sensitive.
     63 }
     64 
     65 bool IsMemberOfExtension(const std::string& input_method_id,
     66                          const std::string& extension_id) {
     67   return StartsWithASCII(input_method_id,
     68                          kExtensionIMEPrefix + extension_id,
     69                          true);  // Case sensitive.
     70 }
     71 
     72 }  // namespace extension_ime_util
     73 }  // namespace chromeos
     74