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segment.go
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segment.go
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package pathutils
import (
"errors"
"strings"
)
// GetPathSegments returns the segments of pth, adjacent '/' characters are treated as a single '/' character.
func GetPathSegments[T ~string](pth T) []string {
split := strings.Split(string(pth), "/")
var segments []string
for _, segment := range split {
if segment != "" {
segments = append(segments, segment)
}
}
return segments
}
// ForEachAbsolutePathSegment calls fn for each segment of pth, adjacent '/' characters are treated as a single '/' character.
// The path is not cleaned, so fn may be invoked with '.' or '..' as segment. The function panics if pth does not start with '/'.
func ForEachAbsolutePathSegment[T ~string](pth T, fn func(segment string, startIndex, endIndex int) error) error {
if pth != "" && pth[0] != '/' {
panic(errors.New("path is not absolute"))
}
return ForEachPathSegment(pth, fn)
}
// ForEachPathSegment calls fn for each segment of pth, adjacent '/' characters are treated as a single '/' character.
// The path is not cleaned, so fn may be invoked with '.' or '..' as segment.
func ForEachPathSegment[T ~string](pth T, fn func(segment string, startIndex, endIndex int) error) error {
if pth == "" {
panic(errors.New("empty path"))
}
segmentStart := 1
for i := 1; i < len(pth); i++ {
if pth[i] == '/' {
if segmentStart != i {
err := fn(string(pth[segmentStart:i]), segmentStart, i)
if err != nil {
return err
}
}
segmentStart = i + 1
}
}
if segmentStart < len(pth) {
return fn(string(pth[segmentStart:]), segmentStart, len(pth))
}
return nil
}
func GetLastPathSegment(pth string) string {
segments := GetPathSegments(pth)
return segments[len(segments)-1]
}
// ContainsRelativePathSegments reports whether $pth contains '.' or '..' segments.
func ContainsRelativePathSegments[T ~string](pth T) bool {
yes := false
if pth == "" {
panic(errors.New("empty path"))
}
err := ForEachPathSegment(pth, func(segment string, startIndex, endIndex int) error {
if segment == "." || segment == ".." {
yes = true
}
return nil
})
if err != nil {
panic(err)
}
return yes
}