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Diffstat (limited to 'vendor/sigs.k8s.io/structured-merge-diff/v4/value/valuereflect.go')
-rw-r--r-- | vendor/sigs.k8s.io/structured-merge-diff/v4/value/valuereflect.go | 294 |
1 files changed, 0 insertions, 294 deletions
diff --git a/vendor/sigs.k8s.io/structured-merge-diff/v4/value/valuereflect.go b/vendor/sigs.k8s.io/structured-merge-diff/v4/value/valuereflect.go deleted file mode 100644 index 05e70deba..000000000 --- a/vendor/sigs.k8s.io/structured-merge-diff/v4/value/valuereflect.go +++ /dev/null @@ -1,294 +0,0 @@ -/* -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 value - -import ( - "encoding/base64" - "fmt" - "reflect" -) - -// NewValueReflect creates a Value backed by an "interface{}" type, -// typically an structured object in Kubernetes world that is uses reflection to expose. -// The provided "interface{}" value must be a pointer so that the value can be modified via reflection. -// The provided "interface{}" may contain structs and types that are converted to Values -// by the jsonMarshaler interface. -func NewValueReflect(value interface{}) (Value, error) { - if value == nil { - return NewValueInterface(nil), nil - } - v := reflect.ValueOf(value) - if v.Kind() != reflect.Ptr { - // The root value to reflect on must be a pointer so that map.Set() and map.Delete() operations are possible. - return nil, fmt.Errorf("value provided to NewValueReflect must be a pointer") - } - return wrapValueReflect(v, nil, nil) -} - -// wrapValueReflect wraps the provide reflect.Value as a value. If parent in the data tree is a map, parentMap -// and parentMapKey must be provided so that the returned value may be set and deleted. -func wrapValueReflect(value reflect.Value, parentMap, parentMapKey *reflect.Value) (Value, error) { - val := HeapAllocator.allocValueReflect() - return val.reuse(value, nil, parentMap, parentMapKey) -} - -// wrapValueReflect wraps the provide reflect.Value as a value, and panics if there is an error. If parent in the data -// tree is a map, parentMap and parentMapKey must be provided so that the returned value may be set and deleted. -func mustWrapValueReflect(value reflect.Value, parentMap, parentMapKey *reflect.Value) Value { - v, err := wrapValueReflect(value, parentMap, parentMapKey) - if err != nil { - panic(err) - } - return v -} - -// the value interface doesn't care about the type for value.IsNull, so we can use a constant -var nilType = reflect.TypeOf(&struct{}{}) - -// reuse replaces the value of the valueReflect. If parent in the data tree is a map, parentMap and parentMapKey -// must be provided so that the returned value may be set and deleted. -func (r *valueReflect) reuse(value reflect.Value, cacheEntry *TypeReflectCacheEntry, parentMap, parentMapKey *reflect.Value) (Value, error) { - if cacheEntry == nil { - cacheEntry = TypeReflectEntryOf(value.Type()) - } - if cacheEntry.CanConvertToUnstructured() { - u, err := cacheEntry.ToUnstructured(value) - if err != nil { - return nil, err - } - if u == nil { - value = reflect.Zero(nilType) - } else { - value = reflect.ValueOf(u) - } - } - r.Value = dereference(value) - r.ParentMap = parentMap - r.ParentMapKey = parentMapKey - r.kind = kind(r.Value) - return r, nil -} - -// mustReuse replaces the value of the valueReflect and panics if there is an error. If parent in the data tree is a -// map, parentMap and parentMapKey must be provided so that the returned value may be set and deleted. -func (r *valueReflect) mustReuse(value reflect.Value, cacheEntry *TypeReflectCacheEntry, parentMap, parentMapKey *reflect.Value) Value { - v, err := r.reuse(value, cacheEntry, parentMap, parentMapKey) - if err != nil { - panic(err) - } - return v -} - -func dereference(val reflect.Value) reflect.Value { - kind := val.Kind() - if (kind == reflect.Interface || kind == reflect.Ptr) && !safeIsNil(val) { - return val.Elem() - } - return val -} - -type valueReflect struct { - ParentMap *reflect.Value - ParentMapKey *reflect.Value - Value reflect.Value - kind reflectType -} - -func (r valueReflect) IsMap() bool { - return r.kind == mapType || r.kind == structMapType -} - -func (r valueReflect) IsList() bool { - return r.kind == listType -} - -func (r valueReflect) IsBool() bool { - return r.kind == boolType -} - -func (r valueReflect) IsInt() bool { - return r.kind == intType || r.kind == uintType -} - -func (r valueReflect) IsFloat() bool { - return r.kind == floatType -} - -func (r valueReflect) IsString() bool { - return r.kind == stringType || r.kind == byteStringType -} - -func (r valueReflect) IsNull() bool { - return r.kind == nullType -} - -type reflectType = int - -const ( - mapType = iota - structMapType - listType - intType - uintType - floatType - stringType - byteStringType - boolType - nullType -) - -func kind(v reflect.Value) reflectType { - typ := v.Type() - rk := typ.Kind() - switch rk { - case reflect.Map: - if v.IsNil() { - return nullType - } - return mapType - case reflect.Struct: - return structMapType - case reflect.Int, reflect.Int64, reflect.Int32, reflect.Int16, reflect.Int8: - return intType - case reflect.Uint, reflect.Uint32, reflect.Uint16, reflect.Uint8: - // Uint64 deliberately excluded, see valueUnstructured.Int. - return uintType - case reflect.Float64, reflect.Float32: - return floatType - case reflect.String: - return stringType - case reflect.Bool: - return boolType - case reflect.Slice: - if v.IsNil() { - return nullType - } - elemKind := typ.Elem().Kind() - if elemKind == reflect.Uint8 { - return byteStringType - } - return listType - case reflect.Chan, reflect.Func, reflect.Ptr, reflect.UnsafePointer, reflect.Interface: - if v.IsNil() { - return nullType - } - panic(fmt.Sprintf("unsupported type: %v", v.Type())) - default: - panic(fmt.Sprintf("unsupported type: %v", v.Type())) - } -} - -// TODO find a cleaner way to avoid panics from reflect.IsNil() -func safeIsNil(v reflect.Value) bool { - k := v.Kind() - switch k { - case reflect.Chan, reflect.Func, reflect.Map, reflect.Ptr, reflect.UnsafePointer, reflect.Interface, reflect.Slice: - return v.IsNil() - } - return false -} - -func (r valueReflect) AsMap() Map { - return r.AsMapUsing(HeapAllocator) -} - -func (r valueReflect) AsMapUsing(a Allocator) Map { - switch r.kind { - case structMapType: - v := a.allocStructReflect() - v.valueReflect = r - return v - case mapType: - v := a.allocMapReflect() - v.valueReflect = r - return v - default: - panic("value is not a map or struct") - } -} - -func (r valueReflect) AsList() List { - return r.AsListUsing(HeapAllocator) -} - -func (r valueReflect) AsListUsing(a Allocator) List { - if r.IsList() { - v := a.allocListReflect() - v.Value = r.Value - return v - } - panic("value is not a list") -} - -func (r valueReflect) AsBool() bool { - if r.IsBool() { - return r.Value.Bool() - } - panic("value is not a bool") -} - -func (r valueReflect) AsInt() int64 { - if r.kind == intType { - return r.Value.Int() - } - if r.kind == uintType { - return int64(r.Value.Uint()) - } - - panic("value is not an int") -} - -func (r valueReflect) AsFloat() float64 { - if r.IsFloat() { - return r.Value.Float() - } - panic("value is not a float") -} - -func (r valueReflect) AsString() string { - switch r.kind { - case stringType: - return r.Value.String() - case byteStringType: - return base64.StdEncoding.EncodeToString(r.Value.Bytes()) - } - panic("value is not a string") -} - -func (r valueReflect) Unstructured() interface{} { - val := r.Value - switch { - case r.IsNull(): - return nil - case val.Kind() == reflect.Struct: - return structReflect{r}.Unstructured() - case val.Kind() == reflect.Map: - return mapReflect{valueReflect: r}.Unstructured() - case r.IsList(): - return listReflect{r.Value}.Unstructured() - case r.IsString(): - return r.AsString() - case r.IsInt(): - return r.AsInt() - case r.IsBool(): - return r.AsBool() - case r.IsFloat(): - return r.AsFloat() - default: - panic(fmt.Sprintf("value of type %s is not a supported by value reflector", val.Type())) - } -} |