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pathset.go
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pathset.go
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// Copyright 2022 Snyk Ltd
//
// 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 inferattributes
import (
"sort"
)
// pathSet is a trie with either strings or ints as keys. This allows us
// to represent accessed attributes in a compact way, sharing the prefixes
// for when multiple properties inside a deeply nested structure are
// accessed. Storing this as a trie also allows us to filter out duplicates
// and overlapping attributes more easily.
type pathSet struct {
intKeys map[int]*pathSet
stringKeys map[string]*pathSet
}
func newPathSet() *pathSet {
return &pathSet{
intKeys: map[int]*pathSet{},
stringKeys: map[string]*pathSet{},
}
}
func (ps *pathSet) addInt(k int, path []interface{}) {
if _, ok := ps.intKeys[k]; !ok {
ps.intKeys[k] = newPathSet()
}
ps.intKeys[k].Add(path)
}
func (ps *pathSet) addString(k string, path []interface{}) {
if _, ok := ps.stringKeys[k]; !ok {
ps.stringKeys[k] = newPathSet()
}
ps.stringKeys[k].Add(path)
}
func (ps *pathSet) Add(path []interface{}) {
if len(path) <= 0 {
return
}
switch k := path[0].(type) {
case int:
ps.addInt(k, path[1:])
case float64:
ps.addInt(int(k), path[1:])
case string:
ps.addString(k, path[1:])
}
}
// List converts the pathSet trie to a list of attributes.
func (ps *pathSet) List() [][]interface{} {
paths := [][]interface{}{}
// Sort int keys for consistent ordering
intKeys := []int{}
for i := range ps.intKeys {
intKeys = append(intKeys, i)
}
sort.Ints(intKeys)
// Recursively add children
for _, k := range intKeys {
for _, childPath := range ps.intKeys[k].List() {
path := make([]interface{}, len(childPath)+1)
path[0] = k
copy(path[1:], childPath)
paths = append(paths, path)
}
}
// Sort string keys for consistent ordering
stringKeys := []string{}
for i := range ps.stringKeys {
stringKeys = append(stringKeys, i)
}
sort.Strings(stringKeys)
// Recursively add children
for _, k := range stringKeys {
for _, childPath := range ps.stringKeys[k].List() {
path := make([]interface{}, len(childPath)+1)
path[0] = k
copy(path[1:], childPath)
paths = append(paths, path)
}
}
// Add this node except when we added children
if len(paths) <= 0 {
paths = append(paths, []interface{}{})
}
return paths
}