doodle/level/json.go

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package level
import (
"bytes"
"encoding/json"
"fmt"
"os"
)
// ToJSON serializes the level as JSON.
func (m *Level) ToJSON() ([]byte, error) {
out := bytes.NewBuffer([]byte{})
encoder := json.NewEncoder(out)
encoder.SetIndent("", "\t")
err := encoder.Encode(m)
return out.Bytes(), err
}
// LoadJSON loads a map from JSON file.
func LoadJSON(filename string) (*Level, error) {
fh, err := os.Open(filename)
if err != nil {
return nil, err
}
defer fh.Close()
m := New()
decoder := json.NewDecoder(fh)
err = decoder.Decode(&m)
if err != nil {
return m, err
}
// Inflate the private instance values.
for _, px := range m.Pixels {
if int(px.PaletteIndex) > len(m.Palette.Swatches) {
return nil, fmt.Errorf(
"pixel %s references palette index %d but there are only %d swatches in the palette",
px, px.PaletteIndex, len(m.Palette.Swatches),
)
}
px.Palette = m.Palette
px.Swatch = m.Palette.Swatches[px.PaletteIndex]
}
return m, err
}