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Implements Path.PopLastSegment().

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This allows a path (/ipfs/foo/bar) to be separated between its head
(/ipfs/foo) and its tail (bar).

License: MIT
Signed-off-by: Stephen Whitmore <noffle@ipfs.io>
This commit is contained in:
Stephen Whitmore
2016-01-24 23:29:41 -08:00
parent 8a2bdc86fb
commit cf0a85b7a4
2 changed files with 46 additions and 0 deletions
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18
path/path.go
View File

@ -50,6 +50,24 @@ func (p Path) IsJustAKey() bool {
return (len(parts) == 2 && parts[0] == "ipfs")
}
// PopLastSegment returns a new Path without its final segment, and the final
// segment, separately. If there is no more to pop (the path is just a key),
// the original path is returned.
func (p Path) PopLastSegment() (Path, string, error) {
if p.IsJustAKey() {
return p, "", nil
}
segs := p.Segments()
newPath, err := ParsePath("/" + strings.Join(segs[:len(segs)-1], "/"))
if err != nil {
return "", "", err
}
return newPath, segs[len(segs)-1], nil
}
func FromSegments(prefix string, seg ...string) (Path, error) {
return ParsePath(prefix + strings.Join(seg, "/"))
}

28
path/path_test.go
View File

@ -49,3 +49,31 @@ func TestIsJustAKey(t *testing.T) {
}
}
}
func TestPopLastSegment(t *testing.T) {
cases := map[string][]string{
"QmdfTbBqBPQ7VNxZEYEj14VmRuZBkqFbiwReogJgS1zR1n": []string{"/ipfs/QmdfTbBqBPQ7VNxZEYEj14VmRuZBkqFbiwReogJgS1zR1n", ""},
"/ipfs/QmdfTbBqBPQ7VNxZEYEj14VmRuZBkqFbiwReogJgS1zR1n": []string{"/ipfs/QmdfTbBqBPQ7VNxZEYEj14VmRuZBkqFbiwReogJgS1zR1n", ""},
"/ipfs/QmdfTbBqBPQ7VNxZEYEj14VmRuZBkqFbiwReogJgS1zR1n/a": []string{"/ipfs/QmdfTbBqBPQ7VNxZEYEj14VmRuZBkqFbiwReogJgS1zR1n", "a"},
"/ipfs/QmdfTbBqBPQ7VNxZEYEj14VmRuZBkqFbiwReogJgS1zR1n/a/b": []string{"/ipfs/QmdfTbBqBPQ7VNxZEYEj14VmRuZBkqFbiwReogJgS1zR1n/a", "b"},
"/ipns/QmdfTbBqBPQ7VNxZEYEj14VmRuZBkqFbiwReogJgS1zR1n/x/y/z": []string{"/ipns/QmdfTbBqBPQ7VNxZEYEj14VmRuZBkqFbiwReogJgS1zR1n/x/y", "z"},
}
for p, expected := range cases {
path, err := ParsePath(p)
if err != nil {
t.Fatalf("ParsePath failed to parse \"%s\", but should have succeeded", p)
}
head, tail, err := path.PopLastSegment()
if err != nil {
t.Fatalf("PopLastSegment failed, but should have succeeded: %s", err)
}
headStr := head.String()
if headStr != expected[0] {
t.Fatalf("expected head of PopLastSegment(%s) to return %v, not %v", p, expected[0], headStr)
}
if tail != expected[1] {
t.Fatalf("expected tail of PopLastSegment(%s) to return %v, not %v", p, expected[1], tail)
}
}
}