list.go

package mpq

import "bytes"

type List interface {
	// Each time Next() returns true
	Next() bool
	// Path() will return a unique path
	Path() string
	// Close your list when you are done
	Close() error
}

// CRLF-friendly alternative to the default Scan function
// (listfile) uses CRLF which sucks
func scan_lines(data []byte, atEOF bool) (advance int, token []byte, err error) {
	if atEOF && len(data) == 0 {
		return 0, nil, nil
	}
	if i := bytes.IndexAny(data, "\r\n"); i >= 0 {
		if data[i] == '\n' {
			// We have a line terminated by single newline.
			return i + 1, data[0:i], nil
		}
		advance = i + 1
		if len(data) > i+1 && data[i+1] == '\n' {
			advance += 1
		}
		return advance, data[0:i], nil
	}
	// If we're at EOF, we have a final, non-terminated line. Return it.
	if atEOF {
		return len(data), data, nil
	}
	// Request more data.
	return 0, nil, nil
}