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package object
import (
"bytes"
"errors"
"fmt"
"io"
"strconv"
"time"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/plumbing/storer"
)
// ErrUnsupportedObject trigger when a non-supported object is being decoded.
var ErrUnsupportedObject = errors.New("unsupported object type")
// Object is a generic representation of any git object. It is implemented by
// Commit, Tree, Blob and Tag, and includes the functions that are common to
// them.
//
// Object is returned when an object could of any type. It is frequently used
// with a type cast to acquire the specific type of object:
//
// func process(obj Object) {
// switch o := obj.(type) {
// case *Commit:
// // o is a Commit
// case *Tree:
// // o is a Tree
// case *Blob:
// // o is a Blob
// case *Tag:
// // o is a Tag
// }
// }
//
// This interface is intentionally different from plumbing.EncodedObject, which is a lower
// level interface used by storage implementations to read and write objects.
type Object interface {
ID() plumbing.Hash
Type() plumbing.ObjectType
Decode(plumbing.EncodedObject) error
Encode(plumbing.EncodedObject) error
}
// GetObject gets an object from an object storer and decodes it.
func GetObject(s storer.EncodedObjectStorer, h plumbing.Hash) (Object, error) {
o, err := s.EncodedObject(plumbing.AnyObject, h)
if err != nil {
return nil, err
}
return DecodeObject(s, o)
}
// DecodeObject decodes an encoded object into an Object and associates it to
// the given object storer.
func DecodeObject(s storer.EncodedObjectStorer, o plumbing.EncodedObject) (Object, error) {
switch o.Type() {
case plumbing.CommitObject:
return DecodeCommit(s, o)
case plumbing.TreeObject:
return DecodeTree(s, o)
case plumbing.BlobObject:
return DecodeBlob(o)
case plumbing.TagObject:
return DecodeTag(s, o)
default:
return nil, plumbing.ErrInvalidType
}
}
// DateFormat is the format being use in the orignal git implementation
const DateFormat = "Mon Jan 02 15:04:05 2006 -0700"
// Signature represents an action signed by a person
type Signature struct {
Name string
Email string
When time.Time
}
// Decode decodes a byte slice into a signature
func (s *Signature) Decode(b []byte) {
open := bytes.IndexByte(b, '<')
close := bytes.IndexByte(b, '>')
if open == -1 || close == -1 {
return
}
s.Name = string(bytes.Trim(b[:open], " "))
s.Email = string(b[open+1 : close])
hasTime := close+2 < len(b)
if hasTime {
s.decodeTimeAndTimeZone(b[close+2:])
}
}
// Encode encodes a Signature into a writer.
func (s *Signature) Encode(w io.Writer) error {
if _, err := fmt.Fprintf(w, "%s <%s> ", s.Name, s.Email); err != nil {
return err
}
if err := s.encodeTimeAndTimeZone(w); err != nil {
return err
}
return nil
}
var timeZoneLength = 5
func (s *Signature) decodeTimeAndTimeZone(b []byte) {
space := bytes.IndexByte(b, ' ')
if space == -1 {
space = len(b)
}
ts, err := strconv.ParseInt(string(b[:space]), 10, 64)
if err != nil {
return
}
s.When = time.Unix(ts, 0).In(time.UTC)
var tzStart = space + 1
if tzStart >= len(b) || tzStart+timeZoneLength > len(b) {
return
}
tl, err := time.Parse("-0700", string(b[tzStart:tzStart+timeZoneLength]))
if err != nil {
return
}
s.When = s.When.In(tl.Location())
}
func (s *Signature) encodeTimeAndTimeZone(w io.Writer) error {
_, err := fmt.Fprintf(w, "%d %s", s.When.Unix(), s.When.Format("-0700"))
return err
}
func (s *Signature) String() string {
return fmt.Sprintf("%s <%s>", s.Name, s.Email)
}
// ObjectIter provides an iterator for a set of objects.
type ObjectIter struct {
storer.EncodedObjectIter
s storer.EncodedObjectStorer
}
// NewObjectIter returns a ObjectIter for the given repository and underlying
// object iterator.
func NewObjectIter(s storer.EncodedObjectStorer, iter storer.EncodedObjectIter) *ObjectIter {
return &ObjectIter{iter, s}
}
// Next moves the iterator to the next object and returns a pointer to it. If it
// has reached the end of the set it will return io.EOF.
func (iter *ObjectIter) Next() (Object, error) {
for {
obj, err := iter.EncodedObjectIter.Next()
if err != nil {
return nil, err
}
o, err := iter.toObject(obj)
if err == plumbing.ErrInvalidType {
continue
}
if err != nil {
return nil, err
}
return o, nil
}
}
// ForEach call the cb function for each object contained on this iter until
// an error happens or the end of the iter is reached. If ErrStop is sent
// the iteration is stop but no error is returned. The iterator is closed.
func (iter *ObjectIter) ForEach(cb func(Object) error) error {
return iter.EncodedObjectIter.ForEach(func(obj plumbing.EncodedObject) error {
o, err := iter.toObject(obj)
if err == plumbing.ErrInvalidType {
return nil
}
if err != nil {
return err
}
return cb(o)
})
}
func (iter *ObjectIter) toObject(obj plumbing.EncodedObject) (Object, error) {
switch obj.Type() {
case plumbing.BlobObject:
blob := &Blob{}
return blob, blob.Decode(obj)
case plumbing.TreeObject:
tree := &Tree{s: iter.s}
return tree, tree.Decode(obj)
case plumbing.CommitObject:
commit := &Commit{}
return commit, commit.Decode(obj)
case plumbing.TagObject:
tag := &Tag{}
return tag, tag.Decode(obj)
default:
return nil, plumbing.ErrInvalidType
}
}
|
