third_party/liblouis/nacl_wrapper/liblouis_instance.h

   1 // Copyright 2013 Google Inc.
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
   4 // use this file except in compliance with the License. You may obtain a copy of
   5 // the License at
   6 //
   7 // http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  12 // License for the specific language governing permissions and limitations under
  13 // the License.
  14
  15 #ifndef LIBLOUIS_NACL_LIBLOUIS_INSTANCE_H_
  16 #define LIBLOUIS_NACL_LIBLOUIS_INSTANCE_H_
  17
  18 #include <string>
  19
  20 #include "base/basictypes.h"
  21 #include "liblouis_wrapper.h"
  22 #include "ppapi/c/pp_instance.h"
  23 #include "ppapi/cpp/completion_callback.h"
  24 #include "ppapi/cpp/instance.h"
  25 #include "ppapi/cpp/message_loop.h"
  26 #include "ppapi/cpp/var.h"
  27 #include "ppapi/utility/completion_callback_factory.h"
  28 #include "ppapi/utility/threading/simple_thread.h"
  29 #include "third_party/jsoncpp/source/include/json/json.h"
  30 #include "translation_params.h"
  31
  32 namespace liblouis_nacl {
  33
  34 class LibLouisInstance : public pp::Instance {
  35  public:
  36   explicit LibLouisInstance(PP_Instance instance);
  37   virtual ~LibLouisInstance();
  38
  39   virtual bool Init(uint32_t argc, const char* argn[], const char* argv[]);
  40   virtual void HandleMessage(const pp::Var& var_message);
  41
  42  private:
  43   // Post work to the background (liblouis) thread.
  44   int32_t PostWorkToBackground(const pp::CompletionCallback& callback) {
  45     return liblouis_thread_.message_loop().PostWork(callback);
  46   }
  47
  48   // Encodes a message as JSON and sends it over to JavaScript.
  49   void PostReply(Json::Value reply, const std::string& in_reply_to);
  50
  51   // Posts an error response to JavaScript.
  52   void PostError(const std::string& error);
  53
  54   // Posts an error response to JavaScript, with the message ID of the call
  55   // which caused it.
  56   void PostError(const std::string& error, const std::string& in_reply_to);
  57
  58   // Parses and executes a table check command.
  59   void HandleCheckTable(const Json::Value& message,
  60       const std::string& message_id);
  61
  62   // Called to check a table on a background thread.
  63   void CheckTableInBackground(int32_t result, const std::string& table_names,
  64       const std::string& message_id);
  65
  66   // Parses and executes a translation command.
  67   void HandleTranslate(const Json::Value& message,
  68       const std::string& message_id);
  69
  70   // Called to translate text on a background thread.
  71   void TranslateInBackground(int32_t result, const TranslationParams& params,
  72       const std::string& message_id);
  73
  74   // Parses and executes a back translation command.
  75   void HandleBackTranslate(const Json::Value& message,
  76       const std::string& message_id);
  77
  78   // Called to back-translate text on a background thread.
  79   void BackTranslateInBackground(int32_t result,
  80       const std::string& table_names, const std::vector<unsigned char>& cells,
  81       const std::string& message_id);
  82
  83   LibLouisWrapper liblouis_;
  84   pp::SimpleThread liblouis_thread_;
  85   pp::CompletionCallbackFactory<LibLouisInstance> cc_factory_;
  86
  87   DISALLOW_COPY_AND_ASSIGN(LibLouisInstance);
  88 };
  89
  90 }  // namespace liblouis_nacl
  91
  92 #endif  // LIBLOUIS_NACL_LIBLOUIS_INSTANCE_H_