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|
package main
import (
"bytes"
"fmt"
"os"
"path/filepath"
"strings"
"gopkg.in/yaml.v3"
)
// Save format is YAML header with metadata, then the text grid below.
// Format:
// ---
// <yaml metadata>
// ...
// <grid lines>
type SaveData struct {
Name string `yaml:"name"`
Width int `yaml:"width"`
Height int `yaml:"height"`
Palette []Terrain `yaml:"palette"`
GridBody string `yaml:"grid_body,omitempty"`
GridColors []string `yaml:"grid_colors,omitempty"`
TextLabels []TextLabel `yaml:"text_labels,omitempty"`
Submaps []SubmapRef `yaml:"submaps,omitempty"`
}
type SubmapRef struct {
X int `yaml:"x"`
Y int `yaml:"y"`
Data SaveData `yaml:"data"`
}
// SerializeMap serializes the map to the save format.
func SerializeMap(m *Map, path string) error {
data := buildSaveData(m)
yamlBytes, err := yaml.Marshal(data)
if err != nil {
return err
}
var buf bytes.Buffer
buf.WriteString("---\n")
buf.Write(yamlBytes)
buf.WriteString("...\n")
for _, row := range m.Grid {
for _, cell := range row {
if cell.Terrain < 0 || cell.Terrain >= len(m.Palette) {
buf.WriteByte(' ')
} else {
buf.WriteString(m.Palette[cell.Terrain].ASCII)
}
}
buf.WriteByte('\n')
}
dir := filepath.Dir(path)
if err := os.MkdirAll(dir, 0755); err != nil {
return err
}
return os.WriteFile(path, buf.Bytes(), 0644)
}
func buildSaveData(m *Map) SaveData {
sd := SaveData{
Name: m.Name,
Width: m.Width,
Height: m.Height,
Palette: m.Palette,
}
// Build grid body (only stored in YAML for submaps)
var gb strings.Builder
for _, row := range m.Grid {
for _, cell := range row {
if cell.Terrain < 0 || cell.Terrain >= len(m.Palette) {
gb.WriteByte(' ')
} else {
gb.WriteString(m.Palette[cell.Terrain].ASCII)
}
}
gb.WriteByte('\n')
}
if m.Parent != nil {
sd.GridBody = gb.String()
}
for y := range m.Grid {
for x := range m.Grid[y] {
c := m.Grid[y][x]
if c.Color != "" {
sd.GridColors = append(sd.GridColors, fmt.Sprintf("%d,%d,%s", x, y, c.Color))
}
}
}
for _, tl := range m.TextLabels {
sd.TextLabels = append(sd.TextLabels, tl)
}
for pt, sub := range m.Submaps {
sd.Submaps = append(sd.Submaps, SubmapRef{
X: pt.X, Y: pt.Y,
Data: buildSaveData(sub),
})
}
return sd
}
// DeserializeMap reads a saved map file.
func DeserializeMap(path string) (*Map, error) {
data, err := os.ReadFile(path)
if err != nil {
return nil, err
}
content := string(data)
if !strings.HasPrefix(content, "---\n") {
return nil, fmt.Errorf("invalid save file: missing YAML header")
}
endIdx := strings.Index(content, "\n...\n")
if endIdx < 0 {
return nil, fmt.Errorf("invalid save file: missing ... terminator")
}
yamlPart := content[4:endIdx]
gridPart := content[endIdx+5:]
var sd SaveData
if err := yaml.Unmarshal([]byte(yamlPart), &sd); err != nil {
return nil, fmt.Errorf("invalid YAML header: %w", err)
}
m := NewMap(sd.Name, sd.Width, sd.Height, sd.Palette)
m.Filename = path
// Restore colors
for _, entry := range sd.GridColors {
var x, y int
var c string
if n, _ := fmt.Sscanf(entry, "%d,%d,%s", &x, &y, &c); n == 3 {
if y >= 0 && y < m.Height && x >= 0 && x < m.Width {
m.Grid[y][x].Color = c
}
}
}
lines := strings.Split(strings.TrimRight(gridPart, "\n"), "\n")
for y, line := range lines {
if y >= m.Height {
break
}
for x, ch := range line {
if x >= m.Width {
break
}
for i, t := range m.Palette {
if string(ch) == t.ASCII {
m.Grid[y][x].Terrain = i
break
}
}
}
}
for _, tl := range sd.TextLabels {
PlaceTextLabel(m, tl.Start, tl.Text, tl.Color)
}
for _, sr := range sd.Submaps {
sub := restoreMap(&sr.Data, m)
m.Submaps[Point{sr.X, sr.Y}] = sub
}
return m, nil
}
func restoreMap(sd *SaveData, parent *Map) *Map {
m := NewMap(sd.Name, sd.Width, sd.Height, sd.Palette)
m.Parent = parent
// Restore colors
for _, entry := range sd.GridColors {
var x, y int
var c string
if n, _ := fmt.Sscanf(entry, "%d,%d,%s", &x, &y, &c); n == 3 {
if y >= 0 && y < m.Height && x >= 0 && x < m.Width {
m.Grid[y][x].Color = c
}
}
}
// Restore grid from GridBody
if sd.GridBody != "" {
lines := strings.Split(strings.TrimRight(sd.GridBody, "\n"), "\n")
for y, line := range lines {
if y >= m.Height {
break
}
for x, ch := range line {
if x >= m.Width {
break
}
for i, t := range m.Palette {
if string(ch) == t.ASCII {
m.Grid[y][x].Terrain = i
break
}
}
}
}
}
for _, tl := range sd.TextLabels {
PlaceTextLabel(m, tl.Start, tl.Text, tl.Color)
}
for _, sr := range sd.Submaps {
sub := restoreMap(&sr.Data, m)
m.Submaps[Point{sr.X, sr.Y}] = sub
}
return m
}
|
