selector.go

/*
   Copyright 2021 Joseph Cumines

   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.
*/

package behaviortree

// Selector is a tick implementation that ticks each child sequentially, until the the first error (returning the
// error), the first non-failure status (returning the status), or all children are ticked (returning failure)
func Selector(children []Node) (Status, error) {
	for _, c := range children {
		status, err := c.Tick()
		if err != nil {
			return Failure, err
		}
		if status == Running {
			return Running, nil
		}
		if status == Success {
			return Success, nil
		}
	}
	return Failure, nil
}