stringtree_leaf.cpp

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#include "ros_type_introspection/stringtree_leaf.hpp"
#include "ros_type_introspection/helper_functions.hpp"

namespace RosIntrospection
{
int StringTreeLeaf::toStr(char* buffer) const
{
  const StringTreeNode* leaf_node = this->node_ptr;
  if (!leaf_node)
  {
    return -1;
  }

  boost::container::static_vector<const std::string*, 16> strings_chain;

  while (leaf_node)
  {
    const auto& str = leaf_node->value();
    strings_chain.push_back(&str);
    leaf_node = leaf_node->parent();
  };

  std::reverse(strings_chain.begin(), strings_chain.end());

  size_t array_count = 0;
  size_t offset = 0;

  for (const auto& str : strings_chain)
  {
    const size_t S = str->size();
    if (S == 1 && (*str)[0] == '#')
    {
      buffer[offset++] = '.';
      offset += print_number(&buffer[offset], this->index_array[array_count++]);
    }
    else
    {
      if (str != strings_chain.front())
      {
        buffer[offset++] = '/';
      }
      std::memcpy(&buffer[offset], str->data(), S);
      offset += S;
    }
  }
  buffer[offset] = '\0';
  return offset;
}

void CreateStringFromTreeLeaf(const StringTreeLeaf& leaf, bool skip_root, std::string& out)
{
  const StringTreeNode* leaf_node = leaf.node_ptr;
  if (!leaf_node)
  {
    out.clear();
    return;
  }

  boost::container::static_vector<const std::string*, 16> strings_chain;

  size_t total_size = 0;

  while (leaf_node)
  {
    const auto& str = leaf_node->value();
    leaf_node = leaf_node->parent();
    if (!(leaf_node == nullptr && skip_root))
    {
      strings_chain.emplace_back(&str);
      const size_t S = str.size();
      if (S == 1 && str[0] == '#')
      {
        total_size += 5;  // super conservative
      }
      else
      {
        total_size += S + 1;
      }
    }
  };

  out.resize(total_size);
  char* buffer = &out[0];

  std::reverse(strings_chain.begin(), strings_chain.end());

  size_t array_count = 0;
  size_t offset = 0;

  for (const auto& str : strings_chain)
  {
    const size_t S = str->size();
    if (S == 1 && (*str)[0] == '#')
    {
      buffer[offset++] = '.';
      offset += print_number(&buffer[offset], leaf.index_array[array_count++]);
    }
    else
    {
      if (str != strings_chain.front())
      {
        buffer[offset++] = '/';
      }
      std::memcpy(&buffer[offset], str->data(), S);
      offset += S;
    }
  }
  out.resize(offset);
}

}  // namespace RosIntrospection