mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-11-01 04:41:22 +00:00
135 lines
3.4 KiB
Go
135 lines
3.4 KiB
Go
/*
|
|
Copyright 2018 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 fieldpath
|
|
|
|
import (
|
|
"sigs.k8s.io/structured-merge-diff/v4/value"
|
|
)
|
|
|
|
// SetFromValue creates a set containing every leaf field mentioned in v.
|
|
func SetFromValue(v value.Value) *Set {
|
|
s := NewSet()
|
|
|
|
w := objectWalker{
|
|
path: Path{},
|
|
value: v,
|
|
allocator: value.NewFreelistAllocator(),
|
|
do: func(p Path) { s.Insert(p) },
|
|
}
|
|
|
|
w.walk()
|
|
return s
|
|
}
|
|
|
|
type objectWalker struct {
|
|
path Path
|
|
value value.Value
|
|
allocator value.Allocator
|
|
|
|
do func(Path)
|
|
}
|
|
|
|
func (w *objectWalker) walk() {
|
|
switch {
|
|
case w.value.IsNull():
|
|
case w.value.IsFloat():
|
|
case w.value.IsInt():
|
|
case w.value.IsString():
|
|
case w.value.IsBool():
|
|
// All leaf fields handled the same way (after the switch
|
|
// statement).
|
|
|
|
// Descend
|
|
case w.value.IsList():
|
|
// If the list were atomic, we'd break here, but we don't have
|
|
// a schema, so we can't tell.
|
|
l := w.value.AsListUsing(w.allocator)
|
|
defer w.allocator.Free(l)
|
|
iter := l.RangeUsing(w.allocator)
|
|
defer w.allocator.Free(iter)
|
|
for iter.Next() {
|
|
i, value := iter.Item()
|
|
w2 := *w
|
|
w2.path = append(w.path, w.GuessBestListPathElement(i, value))
|
|
w2.value = value
|
|
w2.walk()
|
|
}
|
|
return
|
|
case w.value.IsMap():
|
|
// If the map/struct were atomic, we'd break here, but we don't
|
|
// have a schema, so we can't tell.
|
|
|
|
m := w.value.AsMapUsing(w.allocator)
|
|
defer w.allocator.Free(m)
|
|
m.IterateUsing(w.allocator, func(k string, val value.Value) bool {
|
|
w2 := *w
|
|
w2.path = append(w.path, PathElement{FieldName: &k})
|
|
w2.value = val
|
|
w2.walk()
|
|
return true
|
|
})
|
|
return
|
|
}
|
|
|
|
// Leaf fields get added to the set.
|
|
if len(w.path) > 0 {
|
|
w.do(w.path)
|
|
}
|
|
}
|
|
|
|
// AssociativeListCandidateFieldNames lists the field names which are
|
|
// considered keys if found in a list element.
|
|
var AssociativeListCandidateFieldNames = []string{
|
|
"key",
|
|
"id",
|
|
"name",
|
|
}
|
|
|
|
// GuessBestListPathElement guesses whether item is an associative list
|
|
// element, which should be referenced by key(s), or if it is not and therefore
|
|
// referencing by index is acceptable. Currently this is done by checking
|
|
// whether item has any of the fields listed in
|
|
// AssociativeListCandidateFieldNames which have scalar values.
|
|
func (w *objectWalker) GuessBestListPathElement(index int, item value.Value) PathElement {
|
|
if !item.IsMap() {
|
|
// Non map items could be parts of sets or regular "atomic"
|
|
// lists. We won't try to guess whether something should be a
|
|
// set or not.
|
|
return PathElement{Index: &index}
|
|
}
|
|
|
|
m := item.AsMapUsing(w.allocator)
|
|
defer w.allocator.Free(m)
|
|
var keys value.FieldList
|
|
for _, name := range AssociativeListCandidateFieldNames {
|
|
f, ok := m.Get(name)
|
|
if !ok {
|
|
continue
|
|
}
|
|
// only accept primitive/scalar types as keys.
|
|
if f.IsNull() || f.IsMap() || f.IsList() {
|
|
continue
|
|
}
|
|
keys = append(keys, value.Field{Name: name, Value: f})
|
|
}
|
|
if len(keys) > 0 {
|
|
keys.Sort()
|
|
return PathElement{Key: &keys}
|
|
}
|
|
return PathElement{Index: &index}
|
|
}
|