mirror of https://github.com/k3s-io/k3s
66 lines
1.3 KiB
Go
66 lines
1.3 KiB
Go
/*
|
|
Copyright 2019 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package generator
|
|
|
|
import "sort"
|
|
|
|
type edge struct {
|
|
from string
|
|
to string
|
|
}
|
|
|
|
func transitiveClosure(in map[string][]string) map[string][]string {
|
|
adj := make(map[edge]bool)
|
|
imports := make(map[string]struct{})
|
|
for from, tos := range in {
|
|
for _, to := range tos {
|
|
adj[edge{from, to}] = true
|
|
imports[to] = struct{}{}
|
|
}
|
|
}
|
|
|
|
// Warshal's algorithm
|
|
for k := range in {
|
|
for i := range in {
|
|
if !adj[edge{i, k}] {
|
|
continue
|
|
}
|
|
for j := range imports {
|
|
if adj[edge{i, j}] {
|
|
continue
|
|
}
|
|
if adj[edge{k, j}] {
|
|
adj[edge{i, j}] = true
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
out := make(map[string][]string, len(in))
|
|
for i := range in {
|
|
for j := range imports {
|
|
if adj[edge{i, j}] {
|
|
out[i] = append(out[i], j)
|
|
}
|
|
}
|
|
|
|
sort.Strings(out[i])
|
|
}
|
|
|
|
return out
|
|
}
|