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[PatchPlanning] Toposort / frontiers (#1101)
* plan Signed-off-by: Rebecca Metzman <rmetzman@google.com> * add pkg Signed-off-by: Rebecca Metzman <rmetzman@google.com> * code Signed-off-by: Rebecca Metzman <rmetzman@google.com> * lint Signed-off-by: Rebecca Metzman <rmetzman@google.com> * lint Signed-off-by: Rebecca Metzman <rmetzman@google.com> * testing Signed-off-by: Rebecca Metzman <rmetzman@google.com> * file change Signed-off-by: Rebecca Metzman <rmetzman@google.com> * delete test file Signed-off-by: Rebecca Metzman <rmetzman@google.com> * fix concurrency Signed-off-by: Rebecca Metzman <rmetzman@google.com> --------- Signed-off-by: Rebecca Metzman <rmetzman@google.com> Co-authored-by: Rebecca Metzman <rmetzman@google.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| // | ||
| // Copyright 2023 The GUAC 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 guacanalytics | ||
|
|
||
| import ( | ||
| "fmt" | ||
| ) | ||
|
|
||
| // TODO: add tests | ||
| func ToposortFromBfsNodeMap(nodeMap map[string]BfsNode) (map[int][]string, error) { | ||
| frontiers := make(map[int][]string) | ||
| parentsMap := copyParents(nodeMap) | ||
| frontierLevel := 0 | ||
| numNodes := 0 | ||
| totalNodes := len(parentsMap) | ||
|
|
||
| for numNodes <= totalNodes { | ||
| foundIDs := make(map[string]bool) | ||
| for id, parentsList := range parentsMap { | ||
| if len(parentsList) == 0 { | ||
| frontiers[frontierLevel] = append(frontiers[frontierLevel], id) | ||
| foundIDs[id] = true | ||
| numNodes++ | ||
| delete(parentsMap, id) | ||
| } | ||
| } | ||
|
|
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| if len(foundIDs) == 0 { | ||
| return frontiers, fmt.Errorf("Error: cycle detected") | ||
| } | ||
|
|
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| for id, parentsList := range parentsMap { | ||
| newParentsList := []string{} | ||
| for _, parentID := range parentsList { | ||
| if !foundIDs[parentID] { | ||
| newParentsList = append(newParentsList, parentID) | ||
| } | ||
| } | ||
|
|
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| parentsMap[id] = newParentsList | ||
| } | ||
| frontierLevel++ | ||
| } | ||
|
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| return frontiers, nil | ||
| } | ||
|
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| func copyParents(inputMap map[string]BfsNode) map[string][]string { | ||
| retMap := map[string][]string{} | ||
| for key, value := range inputMap { | ||
| if !value.NotInBlastRadius { | ||
| retMap[key] = append(retMap[key], value.Parents...) | ||
| } | ||
| } | ||
| return retMap | ||
| } |