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package formatter
import (
"encoding/json"
"errors"
"fmt"
diff "github.com/yudai/gojsondiff"
)
const (
DeltaDelete = 0
DeltaTextDiff = 2
DeltaMove = 3
)
func NewDeltaFormatter() *DeltaFormatter {
return &DeltaFormatter{
PrintIndent: true,
}
}
type DeltaFormatter struct {
PrintIndent bool
}
func (f *DeltaFormatter) Format(diff diff.Diff) (result string, err error) {
jsonObject, err := f.formatObject(diff.Deltas())
if err != nil {
return "", err
}
var resultBytes []byte
if f.PrintIndent {
resultBytes, err = json.MarshalIndent(jsonObject, "", " ")
} else {
resultBytes, err = json.Marshal(jsonObject)
}
if err != nil {
return "", err
}
return string(resultBytes) + "\n", nil
}
func (f *DeltaFormatter) FormatAsJson(diff diff.Diff) (json map[string]interface{}, err error) {
return f.formatObject(diff.Deltas())
}
func (f *DeltaFormatter) formatObject(deltas []diff.Delta) (deltaJson map[string]interface{}, err error) {
deltaJson = map[string]interface{}{}
for _, delta := range deltas {
switch delta.(type) {
case *diff.Object:
d := delta.(*diff.Object)
deltaJson[d.Position.String()], err = f.formatObject(d.Deltas)
if err != nil {
return nil, err
}
case *diff.Array:
d := delta.(*diff.Array)
deltaJson[d.Position.String()], err = f.formatArray(d.Deltas)
if err != nil {
return nil, err
}
case *diff.Added:
d := delta.(*diff.Added)
deltaJson[d.PostPosition().String()] = []interface{}{d.Value}
case *diff.Modified:
d := delta.(*diff.Modified)
deltaJson[d.PostPosition().String()] = []interface{}{d.OldValue, d.NewValue}
case *diff.TextDiff:
d := delta.(*diff.TextDiff)
deltaJson[d.PostPosition().String()] = []interface{}{d.DiffString(), 0, DeltaTextDiff}
case *diff.Deleted:
d := delta.(*diff.Deleted)
deltaJson[d.PrePosition().String()] = []interface{}{d.Value, 0, DeltaDelete}
case *diff.Moved:
return nil, errors.New("Delta type 'Move' is not supported in objects")
default:
return nil, errors.New(fmt.Sprintf("Unknown Delta type detected: %#v", delta))
}
}
return
}
func (f *DeltaFormatter) formatArray(deltas []diff.Delta) (deltaJson map[string]interface{}, err error) {
deltaJson = map[string]interface{}{
"_t": "a",
}
for _, delta := range deltas {
switch delta.(type) {
case *diff.Object:
d := delta.(*diff.Object)
deltaJson[d.Position.String()], err = f.formatObject(d.Deltas)
if err != nil {
return nil, err
}
case *diff.Array:
d := delta.(*diff.Array)
deltaJson[d.Position.String()], err = f.formatArray(d.Deltas)
if err != nil {
return nil, err
}
case *diff.Added:
d := delta.(*diff.Added)
deltaJson[d.PostPosition().String()] = []interface{}{d.Value}
case *diff.Modified:
d := delta.(*diff.Modified)
deltaJson[d.PostPosition().String()] = []interface{}{d.OldValue, d.NewValue}
case *diff.TextDiff:
d := delta.(*diff.TextDiff)
deltaJson[d.PostPosition().String()] = []interface{}{d.DiffString(), 0, DeltaTextDiff}
case *diff.Deleted:
d := delta.(*diff.Deleted)
deltaJson["_"+d.PrePosition().String()] = []interface{}{d.Value, 0, DeltaDelete}
case *diff.Moved:
d := delta.(*diff.Moved)
deltaJson["_"+d.PrePosition().String()] = []interface{}{"", d.PostPosition(), DeltaMove}
default:
return nil, errors.New(fmt.Sprintf("Unknown Delta type detected: %#v", delta))
}
}
return
}
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