30 lines
802 B
Go
30 lines
802 B
Go
package util
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import (
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"encoding/json"
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"fmt"
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"github.com/tidwall/gjson"
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"github.com/tidwall/sjson"
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)
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// MarshalAndDeleteEmpty marshals a JSON object, then uses gjson to delete empty objects at the given gjson paths.
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//
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// This can be used as a convenient way to create a marshaler that omits empty non-pointer structs.
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// See mautrix.RespSync for example.
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func MarshalAndDeleteEmpty(marshalable interface{}, paths []string) ([]byte, error) {
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data, err := json.Marshal(marshalable)
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if err != nil {
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return nil, err
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}
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for _, path := range paths {
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res := gjson.GetBytes(data, path)
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if res.IsObject() && len(res.Raw) == 2 {
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data, err = sjson.DeleteBytes(data, path)
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if err != nil {
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return nil, fmt.Errorf("failed to delete empty %s: %w", path, err)
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}
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}
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}
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return data, nil
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}
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