func tarjanSort(successors map[bson.ObjectId][]bson.ObjectId) [][]bson.ObjectId {
// http://en.wikipedia.org/wiki/Tarjan%27s_strongly_connected_components_algorithm
data := &tarjanData{
successors: successors,
nodes: make([]tarjanNode, 0, len(successors)),
index: make(map[bson.ObjectId]int, len(successors)),
}
// Sort all nodes to stabilize the logic.
var all []string
for id := range successors {
all = append(all, string(id))
}
sort.Strings(all)
for _, strid := range all {
id := bson.ObjectId(strid)
if _, seen := data.index[id]; !seen {
data.strongConnect(id)
}
}
return data.output
}
""},
{bson.M{"_": float64(5.05)},
"\x01_\x00333333\x14@"},
{bson.M{"_": "yo"},
"\x02_\x00\x03\x00\x00\x00yo\x00"},
{bson.M{"_": bson.M{"a": true}},
"\x03_\x00\x09\x00\x00\x00\x08a\x00\x01\x00"},
{bson.M{"_": []interface{}{true, false}},
"\x04_\x00\r\x00\x00\x00\x080\x00\x01\x081\x00\x00\x00"},
{bson.M{"_": []byte("yo")},
"\x05_\x00\x02\x00\x00\x00\x00yo"},
{bson.M{"_": bson.Binary{0x80, []byte("udef")}},
"\x05_\x00\x04\x00\x00\x00\x80udef"},
{bson.M{"_": bson.Undefined}, // Obsolete, but still seen in the wild.
"\x06_\x00"},
{bson.M{"_": bson.ObjectId("0123456789ab")},
"\x07_\x000123456789ab"},
{bson.M{"_": false},
"\x08_\x00\x00"},
{bson.M{"_": true},
"\x08_\x00\x01"},
{bson.M{"_": time.Unix(0, 258e6)}, // Note the NS <=> MS conversion.
"\x09_\x00\x02\x01\x00\x00\x00\x00\x00\x00"},
{bson.M{"_": nil},
"\x0A_\x00"},
{bson.M{"_": bson.RegEx{"ab", "cd"}},
"\x0B_\x00ab\x00cd\x00"},
{bson.M{"_": bson.JavaScript{"code", nil}},
"\x0D_\x00\x05\x00\x00\x00code\x00"},
{bson.M{"_": bson.Symbol("sym")},
"\x0E_\x00\x04\x00\x00\x00sym\x00"},
func bid(n int) bson.ObjectId {
return bson.ObjectId(fmt.Sprintf("%024d", n))
}