doodle/doodads/json.go

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package doodads
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
)
// ToJSON serializes the doodad as JSON.
func (d *Doodad) ToJSON() ([]byte, error) {
out := bytes.NewBuffer([]byte{})
encoder := json.NewEncoder(out)
encoder.SetIndent("", "\t")
err := encoder.Encode(d)
return out.Bytes(), err
}
// WriteJSON writes a Doodad to JSON on disk.
func (d *Doodad) WriteJSON(filename string) error {
json, err := d.ToJSON()
if err != nil {
return fmt.Errorf("Doodad.WriteJSON: JSON encode error: %s", err)
}
err = ioutil.WriteFile(filename, json, 0755)
if err != nil {
return fmt.Errorf("Doodad.WriteJSON: WriteFile error: %s", err)
}
d.Filename = filepath.Base(filename)
return nil
}
// LoadJSON loads a map from JSON file.
func LoadJSON(filename string) (*Doodad, error) {
fh, err := os.Open(filename)
if err != nil {
return nil, err
}
defer fh.Close()
// Decode the JSON file from disk.
d := New(0)
decoder := json.NewDecoder(fh)
err = decoder.Decode(&d)
if err != nil {
return d, fmt.Errorf("doodad.LoadJSON: JSON decode error: %s", err)
}
// Inflate the chunk metadata to map the pixels to their palette indexes.
d.Filename = filepath.Base(filename)
d.Inflate()
return d, err
}