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package noder
import (
"bytes"
"strings"
)
// Path values represent a noder and its ancestors. The root goes first
// and the actual final noder the path is refering to will be the last.
//
// A path implements the Noder interface, redirecting all the interface
// calls to its final noder.
//
// Paths build from an empty Noder slice are not valid paths and should
// not be used.
type Path []Noder
// String returns the full path of the final noder as a string, using
// "/" as the separator.
func (p Path) String() string {
var buf bytes.Buffer
sep := ""
for _, e := range p {
_, _ = buf.WriteString(sep)
sep = "/"
_, _ = buf.WriteString(e.Name())
}
return buf.String()
}
// Last returns the final noder in the path.
func (p Path) Last() Noder {
return p[len(p)-1]
}
// Hash returns the hash of the final noder of the path.
func (p Path) Hash() []byte {
return p.Last().Hash()
}
// Name returns the name of the final noder of the path.
func (p Path) Name() string {
return p.Last().Name()
}
// IsDir returns if the final noder of the path is a directory-like
// noder.
func (p Path) IsDir() bool {
return p.Last().IsDir()
}
// Children returns the children of the final noder in the path.
func (p Path) Children() ([]Noder, error) {
return p.Last().Children()
}
// NumChildren returns the number of children the final noder of the
// path has.
func (p Path) NumChildren() (int, error) {
return p.Last().NumChildren()
}
// Compare returns -1, 0 or 1 if the path p is smaller, equal or bigger
// than other, in "directory order"; for example:
//
// "a" < "b"
// "a/b/c/d/z" < "b"
// "a/b/a" > "a/b"
func (p Path) Compare(other Path) int {
i := 0
for {
switch {
case len(other) == len(p) && i == len(p):
return 0
case i == len(other):
return 1
case i == len(p):
return -1
default:
cmp := strings.Compare(p[i].Name(), other[i].Name())
if cmp != 0 {
return cmp
}
}
i++
}
}
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