Encode writes the CSV encoding of v to the stream.
(v interface{})
| 33 | |
| 34 | // Encode writes the CSV encoding of v to the stream. |
| 35 | func (enc *Encoder) Encode(v interface{}) error { |
| 36 | if v == nil { |
| 37 | _, err := enc.w.Write([]byte("null")) |
| 38 | return err |
| 39 | } |
| 40 | |
| 41 | var items []interface{} |
| 42 | val := reflect.ValueOf(v) |
| 43 | switch val.Kind() { |
| 44 | case reflect.Slice: |
| 45 | items = make([]interface{}, val.Len()) |
| 46 | for i := 0; i < val.Len(); i++ { |
| 47 | items[i] = val.Index(i).Interface() |
| 48 | } |
| 49 | default: |
| 50 | items = []interface{}{v} |
| 51 | } |
| 52 | numObjects := len(items) |
| 53 | flattenObjects := make([]map[string]interface{}, numObjects) |
| 54 | for i := 0; i < numObjects; i++ { |
| 55 | f, err := flatten(items[i]) |
| 56 | if err != nil { |
| 57 | return err |
| 58 | } |
| 59 | flattenObjects[i] = f |
| 60 | } |
| 61 | |
| 62 | keys := make(map[string]struct{}) |
| 63 | for _, o := range flattenObjects { |
| 64 | for k := range o { |
| 65 | keys[k] = struct{}{} |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | header := make([]string, len(keys)) |
| 70 | i := 0 |
| 71 | for k := range keys { |
| 72 | header[i] = k |
| 73 | i++ |
| 74 | } |
| 75 | sort.Strings(header) |
| 76 | |
| 77 | w := csv.NewWriter(enc.w) |
| 78 | if len(header) > 1 || len(header) == 0 && header[0] != "" { |
| 79 | if err := w.Write(header); err != nil { |
| 80 | return err |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | for _, o := range flattenObjects { |
| 85 | record := make([]string, len(keys)) |
| 86 | for i, key := range header { |
| 87 | val, ok := o[key] |
| 88 | if ok && val != nil { |
| 89 | record[i] = fmt.Sprintf("%v", val) |
| 90 | } |
| 91 | } |
| 92 | if err := w.Write(record); err != nil { |