Updated 1.21.6

level/item/generator/items.go.tmpl

@@ -0,0 +1,33 @@
+// Code generated by {{Generator}}; DO NOT EDIT.
+
+package item
+
+import (
+	"github.com/Tnze/go-mc/level/block"
+)
+
+type (
+{{- range .}}
+    {{.Name | ToGoTypeName}} struct {}
+{{- end}}
+)
+
+{{- range .}}
+func ({{.Name | ToGoTypeName}}) ID() string { return {{.Name | printf "%q"}} }
+{{- end}}
+
+{{- range .}}
+{{- if .Block}}
+func ({{.Name | ToGoTypeName}}) Block() block.Block {
+	return block.FromID[{{.Block | printf "%q"}}]
+}
+{{- end}}
+{{- end}}
+
+var FromID = map[string]Item { {{- range .}}
+	{{.Name | printf "%q"}}: {{.Name | ToGoTypeName}}{},{{end}}
+}
+
+var ToID = map[ID]Item { {{- range .}}
+   {{.Id | printf "%d"}}: {{.Name | ToGoTypeName}}{},{{end}}
+}

level/item/generator/main.go

@@ -0,0 +1,78 @@
+package main
+
+import (
+	"bytes"
+	"compress/gzip"
+	_ "embed"
+	"go/format"
+	"log"
+	"os"
+	"text/template"
+
+	"github.com/Tnze/go-mc/internal/generateutils"
+	"github.com/Tnze/go-mc/nbt"
+)
+
+//go:embed items.go.tmpl
+var tempSource string
+
+var temp = template.Must(template.
+	New("item_template").
+	Funcs(template.FuncMap{
+		"UpperTheFirst": generateutils.UpperTheFirst,
+		"ToGoTypeName":  generateutils.ToGoTypeName,
+		"Generator":     func() string { return "generator/main.go" },
+	}).
+	Parse(tempSource),
+)
+
+type Item struct {
+	Name  string
+	Id    int
+	Block string `nbt:"Block,omitempty"`
+}
+
+func main() {
+	var states []Item
+	readItems(&states)
+
+	// generate go source file
+	genSourceFile(states)
+}
+
+func readItems(states *[]Item) {
+	// open block_states data file
+	f, err := os.Open("items.nbt")
+	if err != nil {
+		log.Panic(err)
+	}
+	defer f.Close()
+
+	r, err := gzip.NewReader(f)
+	if err != nil {
+		log.Panic(err)
+	}
+
+	// parse the nbt format
+	if _, err := nbt.NewDecoder(r).Decode(states); err != nil {
+		log.Panic(err)
+	}
+}
+
+func genSourceFile(states []Item) {
+	var source bytes.Buffer
+	if err := temp.Execute(&source, states); err != nil {
+		log.Panic(err)
+	}
+
+	formattedSource, err := format.Source(source.Bytes())
+	if err != nil {
+		panic(err)
+	}
+
+	err = os.WriteFile("items.go", formattedSource, 0o666)
+	if err != nil {
+		panic(err)
+	}
+	log.Print("Generated items.go")
+}

level/item/item.go

@@ -0,0 +1,20 @@
+package item
+
+import (
+	_ "embed"
+
+	"github.com/Tnze/go-mc/level/block"
+)
+
+type Item interface {
+	ID() string
+}
+
+type BlockItem interface {
+	Block() block.Block
+}
+
+// This file stores all possible block states into a TAG_List with gzip compressed.
+//
+//go:generate go run ./generator/main.go
+type ID int