package parser

// Next retrieves the next parsed item.
// When a valid item was found, then the boolean return parameter will be true.
// On error or when successfully reaching the end of the input, false is returned.
// When an error occurred, it will be set in the error return value, nil otherwise.
func (l *Parser) Next() (Item, *Error, bool) {
	for {
		select {
		case i := <-l.items:
			switch {
			case i.Type == ItemEOF:
				return i, nil, false
			case i.Type == ItemError:
				l.err = &Error{i.Value, l.cursorRow, l.cursorColumn}
				return i, l.err, false
			default:
				l.item = i
				return i, nil, true
			}
		default:
			l.state = l.state(l)
		}
	}
}

// ToArray returns Parser items as an array (mainly intended for testing purposes)
// When an error occurs during scanning, a partial result will be
// returned, accompanied by the error that occurred.
func (l *Parser) ToArray() ([]Item, *Error) {
	var items []Item
	for {
		item, err, more := l.Next()
		if !more {
			return items, err
		}
		items = append(items, item)
	}
}