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|
package objects
import (
"bufio"
"bytes"
"errors"
"fmt"
"sort"
)
type TreeEntryType string
const (
TETFile TreeEntryType = "file"
TETDir TreeEntryType = "dir"
TETSymlink TreeEntryType = "symlink"
)
var treeEntryTypes = map[TreeEntryType]struct{}{
TETFile: {},
TETDir: {},
TETSymlink: {},
}
type TreeEntry interface {
Type() TreeEntryType
equalContent(TreeEntry) bool
toProperties() properties
}
func compareTreeEntries(a, b TreeEntry) bool {
return a.Type() == b.Type() && a.equalContent(b)
}
type TreeEntryFile ObjectId
func (tef TreeEntryFile) Type() TreeEntryType {
return TETFile
}
func (tef TreeEntryFile) toProperties() properties {
return properties{"ref": ObjectId(tef).String()}
}
func (a TreeEntryFile) equalContent(_b TreeEntry) bool {
b, ok := _b.(TreeEntryFile)
return ok && ObjectId(b).Equals(ObjectId(a))
}
type TreeEntryDir ObjectId
func (ted TreeEntryDir) Type() TreeEntryType {
return TETDir
}
func (ted TreeEntryDir) toProperties() properties {
return properties{"ref": ObjectId(ted).String()}
}
func (a TreeEntryDir) equalContent(_b TreeEntry) bool {
b, ok := _b.(TreeEntryDir)
return ok && ObjectId(b).Equals(ObjectId(a))
}
type TreeEntrySymlink string
func (tes TreeEntrySymlink) Type() TreeEntryType {
return TETSymlink
}
func (tes TreeEntrySymlink) toProperties() properties {
return properties{"target": string(tes)}
}
func (a TreeEntrySymlink) equalContent(_b TreeEntry) bool {
b, ok := _b.(TreeEntrySymlink)
return ok && b == a
}
type Tree map[string]TreeEntry
func (t Tree) Type() ObjectType {
return OTTree
}
func (t Tree) Payload() (out []byte) {
lines := []string{}
for name, entry := range t {
props := entry.toProperties()
props["type"] = string(entry.Type())
props["name"] = name
line, err := props.MarshalText()
if err != nil {
panic(err)
}
lines = append(lines, string(line)+"\n")
}
sort.Strings(lines)
for _, line := range lines {
out = append(out, line...)
}
return
}
func getObjectIdFromProps(p properties, key string) (ObjectId, error) {
raw, ok := p[key]
if !ok {
return ObjectId{}, fmt.Errorf("Missing key: %s", key)
}
oid, err := ParseObjectId(raw)
return oid, err
}
func (t Tree) FromPayload(payload []byte) error {
sc := bufio.NewScanner(bytes.NewReader(payload))
for sc.Scan() {
line := sc.Bytes()
if len(line) == 0 {
continue
}
props := make(properties)
if err := props.UnmarshalText(line); err != nil {
return nil
}
entry_type, ok := props["type"]
if !ok {
return errors.New("Missing property: type")
}
var entry TreeEntry
switch TreeEntryType(entry_type) {
case TETFile:
ref, err := getObjectIdFromProps(props, "ref")
if err != nil {
return err
}
entry = TreeEntryFile(ref)
case TETDir:
ref, err := getObjectIdFromProps(props, "ref")
if err != nil {
return err
}
entry = TreeEntryDir(ref)
case TETSymlink:
target, ok := props["target"]
if !ok {
return errors.New("Missing key: target")
}
entry = TreeEntrySymlink(target)
default:
// TODO: Or should we just ignore this entry? There might be more types in the future...
return fmt.Errorf("Unknown tree entry type: %s", entry_type)
}
name, ok := props["name"]
if !ok {
return errors.New("Missing property: name")
}
t[name] = entry
}
return sc.Err()
}
func (a Tree) Equals(b Tree) bool {
for k, va := range a {
vb, ok := b[k]
if !ok || va.Type() != vb.Type() || !va.equalContent(vb) {
return false
}
}
for k := range b {
_, ok := a[k]
if !ok {
return false
}
}
return true
}
|
