139 lines
2.6 KiB
Go
139 lines
2.6 KiB
Go
package cc
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import (
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"fmt"
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"cuelang.org/go/cue"
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cuejson "cuelang.org/go/encoding/json"
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"github.com/KromDaniel/jonson"
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"github.com/pkg/errors"
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)
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type JSON []byte
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func (s JSON) Get(path ...string) ([]byte, error) {
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if s == nil {
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s = []byte("{}")
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}
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var (
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root *jonson.JSON
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)
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root, err := jonson.Parse(s)
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if err != nil {
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return nil, errors.Wrap(err, "parse root json")
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}
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pointer := root
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for _, key := range path {
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// FIXME: we can traverse maps but not arrays (need to handle int keys)
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pointer = pointer.At(key)
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}
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// FIXME: use indent function from stdlib
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return pointer.ToJSON()
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}
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func (s JSON) Unset(path ...string) (JSON, error) {
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if s == nil {
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s = []byte("{}")
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}
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var (
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root *jonson.JSON
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)
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root, err := jonson.Parse(s)
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if err != nil {
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return nil, errors.Wrap(err, "unset: parse root json")
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}
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var (
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pointer = root
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pathDir []string
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)
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if len(path) > 0 {
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pathDir = path[:len(path)-1]
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}
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for _, key := range pathDir {
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pointer = pointer.At(key)
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}
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if len(path) == 0 {
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pointer.Set(nil)
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} else {
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key := path[len(path)-1]
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pointer.DeleteMapKey(key)
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}
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return root.ToJSON()
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}
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func (s JSON) Set(valueJSON []byte, path ...string) (JSON, error) {
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if s == nil {
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s = []byte("{}")
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}
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var (
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root *jonson.JSON
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value *jonson.JSON
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)
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root, err := jonson.Parse(s)
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if err != nil {
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return nil, errors.Wrap(err, "parse root json")
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}
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value, err = jonson.Parse(valueJSON)
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if err != nil {
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return nil, errors.Wrapf(err, "SetJSON: parse value json: |%s|", valueJSON)
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}
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var (
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pointer = root
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pathDir []string
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)
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if len(path) > 0 {
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pathDir = path[:len(path)-1]
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}
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for _, key := range pathDir {
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if !pointer.ObjectKeyExists(key) {
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pointer.MapSet(key, jonson.NewEmptyJSONMap())
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}
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pointer = pointer.At(key)
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}
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if len(path) == 0 {
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pointer.Set(value)
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} else {
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key := path[len(path)-1]
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pointer.MapSet(key, value)
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}
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return root.ToJSON()
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}
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func (s JSON) Merge(layers ...JSON) (JSON, error) {
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r := new(cue.Runtime)
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var resultInst *cue.Instance
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for i, l := range append([]JSON{s}, layers...) {
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if l == nil {
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continue
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}
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filename := fmt.Sprintf("%d", i)
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inst, err := cuejson.Decode(r, filename, []byte(l))
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if err != nil {
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return nil, err
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}
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if resultInst == nil {
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resultInst = inst
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} else {
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resultInst, err = resultInst.Fill(inst.Value())
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if err != nil {
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return nil, err
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}
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if resultInst.Err != nil {
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return nil, resultInst.Err
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}
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}
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}
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b, err := resultInst.Value().MarshalJSON()
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if err != nil {
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return nil, err
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}
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return JSON(b), nil
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}
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func (s JSON) String() string {
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if s == nil {
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return "{}"
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}
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return string(s)
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}
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