58 lines
1.1 KiB
Go
58 lines
1.1 KiB
Go
package ftp
|
|
|
|
// A scanner for fields delimited by one or more whitespace characters
|
|
type scanner struct {
|
|
bytes []byte
|
|
position int
|
|
}
|
|
|
|
// newScanner creates a new scanner
|
|
func newScanner(str string) *scanner {
|
|
return &scanner{
|
|
bytes: []byte(str),
|
|
}
|
|
}
|
|
|
|
// NextFields returns the next `count` fields
|
|
func (s *scanner) NextFields(count int) []string {
|
|
fields := make([]string, 0, count)
|
|
for i := 0; i < count; i++ {
|
|
if field := s.Next(); field != "" {
|
|
fields = append(fields, field)
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
return fields
|
|
}
|
|
|
|
// Next returns the next field
|
|
func (s *scanner) Next() string {
|
|
sLen := len(s.bytes)
|
|
|
|
// skip trailing whitespace
|
|
for s.position < sLen {
|
|
if s.bytes[s.position] != ' ' {
|
|
break
|
|
}
|
|
s.position++
|
|
}
|
|
|
|
start := s.position
|
|
|
|
// skip non-whitespace
|
|
for s.position < sLen {
|
|
if s.bytes[s.position] == ' ' {
|
|
s.position++
|
|
return string(s.bytes[start : s.position-1])
|
|
}
|
|
s.position++
|
|
}
|
|
|
|
return string(s.bytes[start:s.position])
|
|
}
|
|
|
|
// Remaining returns the remaining string
|
|
func (s *scanner) Remaining() string {
|
|
return string(s.bytes[s.position:len(s.bytes)])
|
|
}
|