package aocutils

import (
	"bytes"
	"io"
)

func SplitComma(data []byte, atEOF bool) (advance int, token []byte, err error) {
	if atEOF && len(data) == 0 {
		return 0, nil, nil
	}
	if i := bytes.IndexByte(data, ','); i >= 0 {
		return i + 1, data[0:i], nil
	}
	if atEOF {
		return len(data), data, nil
	}
	return 0, nil, nil
}

func ReadString(r io.Reader) (string, error) {
	buff, err := io.ReadAll(r)
	if err != nil {
		return "", err
	}
	return string(buff), nil
}