mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-21 04:20:23 +00:00
ff3e84ad67
updating kubernetes to 1.28.0 in the main repo. Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
810 lines
15 KiB
Go
810 lines
15 KiB
Go
package jsonpatch
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"strconv"
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"strings"
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"github.com/pkg/errors"
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)
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const (
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eRaw = iota
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eDoc
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eAry
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)
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var (
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// SupportNegativeIndices decides whether to support non-standard practice of
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// allowing negative indices to mean indices starting at the end of an array.
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// Default to true.
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SupportNegativeIndices bool = true
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// AccumulatedCopySizeLimit limits the total size increase in bytes caused by
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// "copy" operations in a patch.
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AccumulatedCopySizeLimit int64 = 0
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)
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var (
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ErrTestFailed = errors.New("test failed")
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ErrMissing = errors.New("missing value")
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ErrUnknownType = errors.New("unknown object type")
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ErrInvalid = errors.New("invalid state detected")
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ErrInvalidIndex = errors.New("invalid index referenced")
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)
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type lazyNode struct {
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raw *json.RawMessage
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doc partialDoc
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ary partialArray
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which int
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}
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// Operation is a single JSON-Patch step, such as a single 'add' operation.
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type Operation map[string]*json.RawMessage
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// Patch is an ordered collection of Operations.
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type Patch []Operation
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type partialDoc map[string]*lazyNode
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type partialArray []*lazyNode
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type container interface {
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get(key string) (*lazyNode, error)
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set(key string, val *lazyNode) error
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add(key string, val *lazyNode) error
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remove(key string) error
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}
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func newLazyNode(raw *json.RawMessage) *lazyNode {
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return &lazyNode{raw: raw, doc: nil, ary: nil, which: eRaw}
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}
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func (n *lazyNode) MarshalJSON() ([]byte, error) {
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switch n.which {
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case eRaw:
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return json.Marshal(n.raw)
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case eDoc:
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return json.Marshal(n.doc)
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case eAry:
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return json.Marshal(n.ary)
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default:
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return nil, ErrUnknownType
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}
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}
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func (n *lazyNode) UnmarshalJSON(data []byte) error {
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dest := make(json.RawMessage, len(data))
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copy(dest, data)
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n.raw = &dest
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n.which = eRaw
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return nil
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}
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func deepCopy(src *lazyNode) (*lazyNode, int, error) {
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if src == nil {
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return nil, 0, nil
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}
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a, err := src.MarshalJSON()
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if err != nil {
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return nil, 0, err
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}
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sz := len(a)
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ra := make(json.RawMessage, sz)
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copy(ra, a)
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return newLazyNode(&ra), sz, nil
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}
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func (n *lazyNode) intoDoc() (*partialDoc, error) {
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if n.which == eDoc {
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return &n.doc, nil
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}
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if n.raw == nil {
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return nil, ErrInvalid
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}
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err := json.Unmarshal(*n.raw, &n.doc)
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if err != nil {
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return nil, err
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}
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n.which = eDoc
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return &n.doc, nil
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}
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func (n *lazyNode) intoAry() (*partialArray, error) {
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if n.which == eAry {
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return &n.ary, nil
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}
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if n.raw == nil {
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return nil, ErrInvalid
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}
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err := json.Unmarshal(*n.raw, &n.ary)
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if err != nil {
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return nil, err
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}
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n.which = eAry
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return &n.ary, nil
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}
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func (n *lazyNode) compact() []byte {
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buf := &bytes.Buffer{}
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if n.raw == nil {
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return nil
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}
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err := json.Compact(buf, *n.raw)
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if err != nil {
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return *n.raw
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}
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return buf.Bytes()
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}
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func (n *lazyNode) tryDoc() bool {
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if n.raw == nil {
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return false
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}
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err := json.Unmarshal(*n.raw, &n.doc)
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if err != nil {
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return false
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}
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n.which = eDoc
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return true
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}
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func (n *lazyNode) tryAry() bool {
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if n.raw == nil {
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return false
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}
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err := json.Unmarshal(*n.raw, &n.ary)
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if err != nil {
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return false
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}
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n.which = eAry
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return true
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}
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func (n *lazyNode) equal(o *lazyNode) bool {
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if n.which == eRaw {
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if !n.tryDoc() && !n.tryAry() {
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if o.which != eRaw {
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return false
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}
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return bytes.Equal(n.compact(), o.compact())
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}
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}
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if n.which == eDoc {
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if o.which == eRaw {
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if !o.tryDoc() {
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return false
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}
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}
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if o.which != eDoc {
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return false
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}
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if len(n.doc) != len(o.doc) {
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return false
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}
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for k, v := range n.doc {
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ov, ok := o.doc[k]
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if !ok {
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return false
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}
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if (v == nil) != (ov == nil) {
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return false
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}
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if v == nil && ov == nil {
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continue
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}
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if !v.equal(ov) {
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return false
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}
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}
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return true
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}
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if o.which != eAry && !o.tryAry() {
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return false
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}
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if len(n.ary) != len(o.ary) {
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return false
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}
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for idx, val := range n.ary {
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if !val.equal(o.ary[idx]) {
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return false
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}
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}
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return true
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}
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// Kind reads the "op" field of the Operation.
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func (o Operation) Kind() string {
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if obj, ok := o["op"]; ok && obj != nil {
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var op string
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err := json.Unmarshal(*obj, &op)
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if err != nil {
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return "unknown"
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}
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return op
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}
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return "unknown"
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}
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// Path reads the "path" field of the Operation.
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func (o Operation) Path() (string, error) {
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if obj, ok := o["path"]; ok && obj != nil {
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var op string
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err := json.Unmarshal(*obj, &op)
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if err != nil {
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return "unknown", err
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}
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return op, nil
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}
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return "unknown", errors.Wrapf(ErrMissing, "operation missing path field")
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}
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// From reads the "from" field of the Operation.
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func (o Operation) From() (string, error) {
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if obj, ok := o["from"]; ok && obj != nil {
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var op string
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err := json.Unmarshal(*obj, &op)
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if err != nil {
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return "unknown", err
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}
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return op, nil
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}
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return "unknown", errors.Wrapf(ErrMissing, "operation, missing from field")
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}
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func (o Operation) value() *lazyNode {
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if obj, ok := o["value"]; ok {
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return newLazyNode(obj)
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}
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return nil
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}
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// ValueInterface decodes the operation value into an interface.
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func (o Operation) ValueInterface() (interface{}, error) {
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if obj, ok := o["value"]; ok && obj != nil {
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var v interface{}
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err := json.Unmarshal(*obj, &v)
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if err != nil {
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return nil, err
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}
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return v, nil
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}
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return nil, errors.Wrapf(ErrMissing, "operation, missing value field")
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}
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func isArray(buf []byte) bool {
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Loop:
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for _, c := range buf {
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switch c {
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case ' ':
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case '\n':
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case '\t':
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continue
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case '[':
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return true
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default:
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break Loop
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}
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}
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return false
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}
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func findObject(pd *container, path string) (container, string) {
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doc := *pd
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split := strings.Split(path, "/")
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if len(split) < 2 {
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return nil, ""
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}
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parts := split[1 : len(split)-1]
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key := split[len(split)-1]
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var err error
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for _, part := range parts {
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next, ok := doc.get(decodePatchKey(part))
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if next == nil || ok != nil {
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return nil, ""
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}
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if isArray(*next.raw) {
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doc, err = next.intoAry()
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if err != nil {
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return nil, ""
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}
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} else {
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doc, err = next.intoDoc()
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if err != nil {
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return nil, ""
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}
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}
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}
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return doc, decodePatchKey(key)
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}
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func (d *partialDoc) set(key string, val *lazyNode) error {
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(*d)[key] = val
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return nil
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}
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func (d *partialDoc) add(key string, val *lazyNode) error {
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(*d)[key] = val
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return nil
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}
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func (d *partialDoc) get(key string) (*lazyNode, error) {
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return (*d)[key], nil
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}
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func (d *partialDoc) remove(key string) error {
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_, ok := (*d)[key]
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if !ok {
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return errors.Wrapf(ErrMissing, "Unable to remove nonexistent key: %s", key)
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}
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delete(*d, key)
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return nil
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}
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// set should only be used to implement the "replace" operation, so "key" must
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// be an already existing index in "d".
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func (d *partialArray) set(key string, val *lazyNode) error {
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idx, err := strconv.Atoi(key)
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if err != nil {
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return err
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}
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if idx < 0 {
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if !SupportNegativeIndices {
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return errors.Wrapf(ErrInvalidIndex, "Unable to access invalid index: %d", idx)
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}
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if idx < -len(*d) {
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return errors.Wrapf(ErrInvalidIndex, "Unable to access invalid index: %d", idx)
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}
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idx += len(*d)
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}
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(*d)[idx] = val
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return nil
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}
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func (d *partialArray) add(key string, val *lazyNode) error {
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if key == "-" {
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*d = append(*d, val)
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return nil
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}
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idx, err := strconv.Atoi(key)
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if err != nil {
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return errors.Wrapf(err, "value was not a proper array index: '%s'", key)
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}
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sz := len(*d) + 1
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ary := make([]*lazyNode, sz)
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cur := *d
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if idx >= len(ary) {
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return errors.Wrapf(ErrInvalidIndex, "Unable to access invalid index: %d", idx)
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}
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if idx < 0 {
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if !SupportNegativeIndices {
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return errors.Wrapf(ErrInvalidIndex, "Unable to access invalid index: %d", idx)
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}
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if idx < -len(ary) {
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return errors.Wrapf(ErrInvalidIndex, "Unable to access invalid index: %d", idx)
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}
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idx += len(ary)
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}
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copy(ary[0:idx], cur[0:idx])
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ary[idx] = val
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copy(ary[idx+1:], cur[idx:])
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*d = ary
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return nil
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}
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func (d *partialArray) get(key string) (*lazyNode, error) {
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idx, err := strconv.Atoi(key)
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if err != nil {
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return nil, err
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}
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if idx < 0 {
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if !SupportNegativeIndices {
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return nil, errors.Wrapf(ErrInvalidIndex, "Unable to access invalid index: %d", idx)
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}
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if idx < -len(*d) {
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return nil, errors.Wrapf(ErrInvalidIndex, "Unable to access invalid index: %d", idx)
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}
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idx += len(*d)
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}
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if idx >= len(*d) {
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return nil, errors.Wrapf(ErrInvalidIndex, "Unable to access invalid index: %d", idx)
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}
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return (*d)[idx], nil
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}
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func (d *partialArray) remove(key string) error {
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idx, err := strconv.Atoi(key)
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if err != nil {
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return err
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}
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cur := *d
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if idx >= len(cur) {
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return errors.Wrapf(ErrInvalidIndex, "Unable to access invalid index: %d", idx)
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}
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if idx < 0 {
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if !SupportNegativeIndices {
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return errors.Wrapf(ErrInvalidIndex, "Unable to access invalid index: %d", idx)
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}
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if idx < -len(cur) {
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return errors.Wrapf(ErrInvalidIndex, "Unable to access invalid index: %d", idx)
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}
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idx += len(cur)
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}
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ary := make([]*lazyNode, len(cur)-1)
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copy(ary[0:idx], cur[0:idx])
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copy(ary[idx:], cur[idx+1:])
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*d = ary
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return nil
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}
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func (p Patch) add(doc *container, op Operation) error {
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path, err := op.Path()
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if err != nil {
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return errors.Wrapf(ErrMissing, "add operation failed to decode path")
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}
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con, key := findObject(doc, path)
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if con == nil {
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return errors.Wrapf(ErrMissing, "add operation does not apply: doc is missing path: \"%s\"", path)
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}
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err = con.add(key, op.value())
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if err != nil {
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return errors.Wrapf(err, "error in add for path: '%s'", path)
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}
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return nil
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}
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func (p Patch) remove(doc *container, op Operation) error {
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path, err := op.Path()
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if err != nil {
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return errors.Wrapf(ErrMissing, "remove operation failed to decode path")
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}
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con, key := findObject(doc, path)
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if con == nil {
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return errors.Wrapf(ErrMissing, "remove operation does not apply: doc is missing path: \"%s\"", path)
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}
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err = con.remove(key)
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if err != nil {
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return errors.Wrapf(err, "error in remove for path: '%s'", path)
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}
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return nil
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}
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func (p Patch) replace(doc *container, op Operation) error {
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path, err := op.Path()
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if err != nil {
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return errors.Wrapf(err, "replace operation failed to decode path")
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}
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con, key := findObject(doc, path)
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if con == nil {
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return errors.Wrapf(ErrMissing, "replace operation does not apply: doc is missing path: %s", path)
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}
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_, ok := con.get(key)
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if ok != nil {
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return errors.Wrapf(ErrMissing, "replace operation does not apply: doc is missing key: %s", path)
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}
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err = con.set(key, op.value())
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if err != nil {
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return errors.Wrapf(err, "error in remove for path: '%s'", path)
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}
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return nil
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}
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func (p Patch) move(doc *container, op Operation) error {
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from, err := op.From()
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if err != nil {
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return errors.Wrapf(err, "move operation failed to decode from")
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}
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con, key := findObject(doc, from)
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if con == nil {
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return errors.Wrapf(ErrMissing, "move operation does not apply: doc is missing from path: %s", from)
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}
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val, err := con.get(key)
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if err != nil {
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return errors.Wrapf(err, "error in move for path: '%s'", key)
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}
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err = con.remove(key)
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if err != nil {
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return errors.Wrapf(err, "error in move for path: '%s'", key)
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}
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path, err := op.Path()
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if err != nil {
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return errors.Wrapf(err, "move operation failed to decode path")
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}
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con, key = findObject(doc, path)
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if con == nil {
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return errors.Wrapf(ErrMissing, "move operation does not apply: doc is missing destination path: %s", path)
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}
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err = con.add(key, val)
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if err != nil {
|
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return errors.Wrapf(err, "error in move for path: '%s'", path)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (p Patch) test(doc *container, op Operation) error {
|
|
path, err := op.Path()
|
|
if err != nil {
|
|
return errors.Wrapf(err, "test operation failed to decode path")
|
|
}
|
|
|
|
con, key := findObject(doc, path)
|
|
|
|
if con == nil {
|
|
return errors.Wrapf(ErrMissing, "test operation does not apply: is missing path: %s", path)
|
|
}
|
|
|
|
val, err := con.get(key)
|
|
if err != nil {
|
|
return errors.Wrapf(err, "error in test for path: '%s'", path)
|
|
}
|
|
|
|
if val == nil {
|
|
if op.value().raw == nil {
|
|
return nil
|
|
}
|
|
return errors.Wrapf(ErrTestFailed, "testing value %s failed", path)
|
|
} else if op.value() == nil {
|
|
return errors.Wrapf(ErrTestFailed, "testing value %s failed", path)
|
|
}
|
|
|
|
if val.equal(op.value()) {
|
|
return nil
|
|
}
|
|
|
|
return errors.Wrapf(ErrTestFailed, "testing value %s failed", path)
|
|
}
|
|
|
|
func (p Patch) copy(doc *container, op Operation, accumulatedCopySize *int64) error {
|
|
from, err := op.From()
|
|
if err != nil {
|
|
return errors.Wrapf(err, "copy operation failed to decode from")
|
|
}
|
|
|
|
con, key := findObject(doc, from)
|
|
|
|
if con == nil {
|
|
return errors.Wrapf(ErrMissing, "copy operation does not apply: doc is missing from path: %s", from)
|
|
}
|
|
|
|
val, err := con.get(key)
|
|
if err != nil {
|
|
return errors.Wrapf(err, "error in copy for from: '%s'", from)
|
|
}
|
|
|
|
path, err := op.Path()
|
|
if err != nil {
|
|
return errors.Wrapf(ErrMissing, "copy operation failed to decode path")
|
|
}
|
|
|
|
con, key = findObject(doc, path)
|
|
|
|
if con == nil {
|
|
return errors.Wrapf(ErrMissing, "copy operation does not apply: doc is missing destination path: %s", path)
|
|
}
|
|
|
|
valCopy, sz, err := deepCopy(val)
|
|
if err != nil {
|
|
return errors.Wrapf(err, "error while performing deep copy")
|
|
}
|
|
|
|
(*accumulatedCopySize) += int64(sz)
|
|
if AccumulatedCopySizeLimit > 0 && *accumulatedCopySize > AccumulatedCopySizeLimit {
|
|
return NewAccumulatedCopySizeError(AccumulatedCopySizeLimit, *accumulatedCopySize)
|
|
}
|
|
|
|
err = con.add(key, valCopy)
|
|
if err != nil {
|
|
return errors.Wrapf(err, "error while adding value during copy")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Equal indicates if 2 JSON documents have the same structural equality.
|
|
func Equal(a, b []byte) bool {
|
|
ra := make(json.RawMessage, len(a))
|
|
copy(ra, a)
|
|
la := newLazyNode(&ra)
|
|
|
|
rb := make(json.RawMessage, len(b))
|
|
copy(rb, b)
|
|
lb := newLazyNode(&rb)
|
|
|
|
return la.equal(lb)
|
|
}
|
|
|
|
// DecodePatch decodes the passed JSON document as an RFC 6902 patch.
|
|
func DecodePatch(buf []byte) (Patch, error) {
|
|
var p Patch
|
|
|
|
err := json.Unmarshal(buf, &p)
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return p, nil
|
|
}
|
|
|
|
// Apply mutates a JSON document according to the patch, and returns the new
|
|
// document.
|
|
func (p Patch) Apply(doc []byte) ([]byte, error) {
|
|
return p.ApplyIndent(doc, "")
|
|
}
|
|
|
|
// ApplyIndent mutates a JSON document according to the patch, and returns the new
|
|
// document indented.
|
|
func (p Patch) ApplyIndent(doc []byte, indent string) ([]byte, error) {
|
|
if len(doc) == 0 {
|
|
return doc, nil
|
|
}
|
|
|
|
var pd container
|
|
if doc[0] == '[' {
|
|
pd = &partialArray{}
|
|
} else {
|
|
pd = &partialDoc{}
|
|
}
|
|
|
|
err := json.Unmarshal(doc, pd)
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
err = nil
|
|
|
|
var accumulatedCopySize int64
|
|
|
|
for _, op := range p {
|
|
switch op.Kind() {
|
|
case "add":
|
|
err = p.add(&pd, op)
|
|
case "remove":
|
|
err = p.remove(&pd, op)
|
|
case "replace":
|
|
err = p.replace(&pd, op)
|
|
case "move":
|
|
err = p.move(&pd, op)
|
|
case "test":
|
|
err = p.test(&pd, op)
|
|
case "copy":
|
|
err = p.copy(&pd, op, &accumulatedCopySize)
|
|
default:
|
|
err = fmt.Errorf("Unexpected kind: %s", op.Kind())
|
|
}
|
|
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
if indent != "" {
|
|
return json.MarshalIndent(pd, "", indent)
|
|
}
|
|
|
|
return json.Marshal(pd)
|
|
}
|
|
|
|
// From http://tools.ietf.org/html/rfc6901#section-4 :
|
|
//
|
|
// Evaluation of each reference token begins by decoding any escaped
|
|
// character sequence. This is performed by first transforming any
|
|
// occurrence of the sequence '~1' to '/', and then transforming any
|
|
// occurrence of the sequence '~0' to '~'.
|
|
|
|
var (
|
|
rfc6901Decoder = strings.NewReplacer("~1", "/", "~0", "~")
|
|
)
|
|
|
|
func decodePatchKey(k string) string {
|
|
return rfc6901Decoder.Replace(k)
|
|
}
|