if_then_else_node.cpp

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/* Copyright (C) 2020 Davide Faconti -  All Rights Reserved
*
*   Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"),
*   to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
*   and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*   The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
*   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
*   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
*   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#include "behaviortree_cpp_v3/controls/if_then_else_node.h"

namespace BT
{
IfThenElseNode::IfThenElseNode(const std::string& name) :
  ControlNode::ControlNode(name, {}), child_idx_(0)
{
  setRegistrationID("IfThenElse");
}

void IfThenElseNode::halt()
{
  child_idx_ = 0;
  ControlNode::halt();
}

NodeStatus IfThenElseNode::tick()
{
  const size_t children_count = children_nodes_.size();

  if (children_count != 2 && children_count != 3)
  {
    throw std::logic_error("IfThenElseNode must have either 2 or 3 children");
  }

  setStatus(NodeStatus::RUNNING);

  if (child_idx_ == 0)
  {
    NodeStatus condition_status = children_nodes_[0]->executeTick();

    if (condition_status == NodeStatus::RUNNING)
    {
      return condition_status;
    }
    else if (condition_status == NodeStatus::SUCCESS)
    {
      child_idx_ = 1;
    }
    else if (condition_status == NodeStatus::FAILURE)
    {
      if (children_count == 3)
      {
        child_idx_ = 2;
      }
      else
      {
        return condition_status;
      }
    }
  }
  // not an else
  if (child_idx_ > 0)
  {
    NodeStatus status = children_nodes_[child_idx_]->executeTick();
    if (status == NodeStatus::RUNNING)
    {
      return NodeStatus::RUNNING;
    }
    else
    {
      resetChildren();
      child_idx_ = 0;
      return status;
    }
  }

  throw std::logic_error("Something unexpected happened in IfThenElseNode");
}

}   // namespace BT