.. _program_listing_file_include_rmw_impl_cpp_key_value.hpp:

Program Listing for File key_value.hpp
======================================

|exhale_lsh| :ref:`Return to documentation for file <file_include_rmw_impl_cpp_key_value.hpp>` (``include/rmw/impl/cpp/key_value.hpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   // Copyright 2017 Open Source Robotics Foundation, Inc.
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at
   //
   //     http://www.apache.org/licenses/LICENSE-2.0
   //
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   #ifndef RMW__IMPL__CPP__KEY_VALUE_HPP_
   #define RMW__IMPL__CPP__KEY_VALUE_HPP_
   
   #include <map>
   #include <string>
   #include <vector>
   
   namespace rmw
   {
   namespace impl
   {
   namespace cpp
   {
   
   // TODO(karsten1987): Implement based on
   // https://github.com/PrismTech/opensplice/blob/master/docs/pdf/OpenSplice_refman_CPP.pdf
   static std::map<std::string, std::vector<uint8_t>>
   parse_key_value(std::vector<uint8_t> kv)
   {
     std::map<std::string, std::vector<uint8_t>> m;
   
     bool keyfound = false;
   
     std::string key;
     std::vector<uint8_t> value;
     uint8_t prev = '\0';
   
     if (kv.size() == 0) {
       goto not_valid;
     }
   
     for (uint8_t u8 : kv) {
       if (keyfound) {
         if ((u8 == ';') && (prev != ';')) {
           prev = u8;
           continue;
         } else if ((u8 != ';') && (prev == ';')) {
           if (value.size() == 0) {
             goto not_valid;
           }
           m[key] = value;
   
           key.clear();
           value.clear();
           keyfound = false;
         } else {
           value.push_back(u8);
         }
       }
       if (!keyfound) {
         if (u8 == '=') {
           if (key.size() == 0) {
             goto not_valid;
           }
           keyfound = true;
         } else if (isalnum(u8)) {
           key.push_back(u8);
         } else if ((u8 == '\0') && (key.size() == 0) && (m.size() > 0)) {
           break;  // accept trailing '\0' characters
         } else if ((prev != ';') || (key.size() > 0)) {
           goto not_valid;
         }
       }
       prev = u8;
     }
     if (keyfound) {
       if (value.size() == 0) {
         goto not_valid;
       }
       m[key] = value;
     } else if (key.size() > 0) {
       goto not_valid;
     }
     return m;
   not_valid:
     // This is not a failure this is something that can happen because the participant_qos userData
     // is used. Other participants in the system not created by rmw could use userData for something
     // else.
     return std::map<std::string, std::vector<uint8_t>>();
   }
   
   }  // namespace cpp
   }  // namespace impl
   }  // namespace rmw
   
   #endif  // RMW__IMPL__CPP__KEY_VALUE_HPP_