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