yaml_util.cpp

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//
// Copyright (c) 2014, Southwest Research Institute® (SwRI®)
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#include <swri_yaml_util/yaml_util.h>

#include <stdio.h>
// C++ standard libraries
#include <sstream>
#include <iomanip>
#ifdef YAMLCPP_OLD_API
#include <fstream>
#endif  // YAMLCPP_OLD_API

#ifndef YAMLCPP_OLD_API
namespace YAML
{
  void operator >> (const YAML::Node& node, float& value)
  {
    value = node.as<float>();
  }

  void operator >> (const YAML::Node& node, double& value)
  {
    value = node.as<double>();
  }

  void operator >> (const YAML::Node& node, bool& value)
  {
    value = node.as<bool>();
  }

  void operator >> (const YAML::Node& node, int16_t& value)
  {
    value = node.as<int16_t>();
  }

  void operator >> (const YAML::Node& node, uint16_t& value)
  {
    value = node.as<uint16_t>();
  }

  void operator >> (const YAML::Node& node, int32_t& value)
  {
    value = node.as<int32_t>();
  }

  void operator >> (const YAML::Node& node, uint32_t& value)
  {
    value = node.as<uint32_t>();
  }

  void operator >> (const YAML::Node& node, int64_t& value)
  {
    value = node.as<int64_t>();
  }
  
  void operator >> (const YAML::Node& node, uint64_t& value)
  {
    value = node.as<uint64_t>();
  }

  void operator >> (const YAML::Node& node, std::string& value)
  {
    value = node.as<std::string>();
  }
}
#endif  // YAMLCPP_OLD_API

namespace swri_yaml_util
{
  bool LoadFile(const std::string& path, YAML::Node& yaml)
  {
    try
    {
      #ifndef YAMLCPP_OLD_API
      yaml = YAML::LoadFile(path);
      #else
      std::ifstream fin(path.c_str());
      if (fin.fail())
      {
        return false;
      }
      
      YAML::Parser parser(fin);
      parser.GetNextDocument(yaml);
      #endif  // YAMLCPP_OLD_API
    }
    catch (...)
    {
      return false;
    }
    
    return true;
  }

  bool LoadString(const std::string& input, YAML::Node& yaml)
  {
    try
    {
#ifndef YAMLCPP_OLD_API
      yaml = YAML::Load(input);
#else
      std::stringstream stream(input);
      YAML::Parser parser(stream);
      parser.GetNextDocument(yaml);
#endif  // YAMLCPP_OLD_API
    }
    catch (...)
    {
      return false;
    }
    
    return true;
  }

  bool LoadMap(const std::map<std::string,std::string>& dict, YAML::Node& yaml)
  {
    std::vector<std::string> items;
    
    for (std::map<std::string,std::string>::const_iterator iter = dict.begin();
         iter != dict.end();
         ++iter)
    {
      if (!iter->first.empty()) {
        items.push_back("\"" + iter->first + "\": \"" + iter->second + "\"");
      }
    }

    std::string input = "{ ";
    for (size_t i = 0; i < items.size(); ++i) {
      input += items[i];
      if (i+1 < items.size()) {
        input += ", ";
      }
    }
    input += "}";

    printf("stringified: %s", input.c_str());
    
    return LoadString(input, yaml);
  }
  
  bool FindValue(const YAML::Node& node, const std::string& name)
  {
    #ifndef YAMLCPP_OLD_API
      return node[name];
    #else
      return node.FindValue(name);
    #endif  // YAMLCPP_OLD_API
  }
  
  std::auto_ptr<YAML::Node> Clone(const YAML::Node& node)
  {
    #ifndef YAMLCPP_OLD_API
      return std::auto_ptr<YAML::Node>(new YAML::Node(YAML::Clone(node)));
    #else
      return node.Clone();
    #endif  // YAMLCPP_OLD_API
  }
  
  std::string ToString(double value, int32_t precision)
  {
    std::stringstream ss;
    ss << std::setprecision(precision) << value;

    return ss.str();
  }
}